The document discusses common printing problems that can occur in sheetfed offset printing and provides guidance on identifying and addressing the issues. It covers doubling effects, misregister, ghosting and yellowing, picking or parts breaking off, mottling, scuffing or carbonizing, drying of ink, and important questions to consider when complaints arise. The summaries provide checklists to help determine the cause of problems and recommendations for improving ink drying, scuff resistance, and other factors.
The document discusses various problem cases that can occur in a printing pressroom, including electrostatic charge on paper, crease formation, picking, emulsification, ghosting, mottling, horizontal stripes, darkening, decreases or increases in tone value, slurring, and lags in drying time. For each issue, it provides details on potential causes and recommended remedies.
The document discusses various problem cases that can occur in a pressroom, including electrostatic charge on paper, crease formation, picking, emulsification, ghosting, mottling, horizontal stripes, darkening, and changes in tone value. It provides details on the causes and remedies for each issue. The key issues covered are electrostatic charge occurring when paper is too dry, crease formation from poorly fed paper or machine settings, and remedies like ensuring proper paper moisture and machine adjustments.
Print quality is determined by several factors including color reproduction, detail reproduction, gloss, and defects. Color reproduction depends on paper properties, ink properties, dot gain, and trapping. Higher print densities and smoother paper surfaces allow for wider color gamuts. Ink demand is mainly controlled by paper roughness and porosity, with smoother papers requiring less ink. Dot gain increases halftone dot size and must be considered when choosing screen rulings. Trapping influences color gamut through secondary colors and depends on ink sequence and transfer properties. Gloss is influenced by paper coating and ink, though consumer perception of differences in gloss can vary.
Basics of offset printing and other printing techniquesSappiHouston
The document provides an overview of different printing methods including offset printing and gravure. It discusses offset printing principles such as how printed and unprinted areas are achieved using the offset plate and fountain solution. Sheet-fed offset and heat-set web offset printing are described. Other conventional printing methods like gravure and flexography are also covered. The document concludes with a high-level summary of the various printing techniques.
Offset printing has the largest range of printing products, from visiting cards to newspapers, magazines, catalogues or illustrated books.
We distinguish between sheet offset printing and web offset printing.
The document discusses web offset printing. Web offset printing uses a continuous roll of paper fed through the printing press. There are two methods of drying - heat set uses forced air heating to dry ink rapidly, while cold set relies on natural evaporation and absorption to dry ink more slowly. The document focuses on web offset printing, describing characteristics like high printing speeds up to 900 meters per minute and applications including books, magazines, newspapers, and catalogs.
This document provides an overview of paper properties and their impact on the printing process. It discusses the paper making process, key paper properties like basis weight, caliper, formation, surface sizing and optical properties. It explains how these properties affect aspects like ink absorption, print quality, smoothness and strength. The document also covers specialty paper grades and educational resources for further understanding paper.
Screen printing uses stencils to transfer images onto surfaces through a fabric screen. The stencil blocks ink from passing through in some areas while allowing it in others to create the image. Carousel screen printing uses multiple screens on a rotating mechanism to print with different colors more quickly and efficiently. Screen printing is commonly used to apply graphics and logos to products. Photocopying uses a dry toner instead of liquid ink in a non-contact printing process, allowing images to be reproduced in different sizes. Gravure printing employs an engraved plate to hold ink which is applied to paper to create high-quality art and photography books. Offset lithography uses oil and gum to divide a smooth plate surface into ink-accepting and ink
The document discusses various problem cases that can occur in a printing pressroom, including electrostatic charge on paper, crease formation, picking, emulsification, ghosting, mottling, horizontal stripes, darkening, decreases or increases in tone value, slurring, and lags in drying time. For each issue, it provides details on potential causes and recommended remedies.
The document discusses various problem cases that can occur in a pressroom, including electrostatic charge on paper, crease formation, picking, emulsification, ghosting, mottling, horizontal stripes, darkening, and changes in tone value. It provides details on the causes and remedies for each issue. The key issues covered are electrostatic charge occurring when paper is too dry, crease formation from poorly fed paper or machine settings, and remedies like ensuring proper paper moisture and machine adjustments.
Print quality is determined by several factors including color reproduction, detail reproduction, gloss, and defects. Color reproduction depends on paper properties, ink properties, dot gain, and trapping. Higher print densities and smoother paper surfaces allow for wider color gamuts. Ink demand is mainly controlled by paper roughness and porosity, with smoother papers requiring less ink. Dot gain increases halftone dot size and must be considered when choosing screen rulings. Trapping influences color gamut through secondary colors and depends on ink sequence and transfer properties. Gloss is influenced by paper coating and ink, though consumer perception of differences in gloss can vary.
Basics of offset printing and other printing techniquesSappiHouston
The document provides an overview of different printing methods including offset printing and gravure. It discusses offset printing principles such as how printed and unprinted areas are achieved using the offset plate and fountain solution. Sheet-fed offset and heat-set web offset printing are described. Other conventional printing methods like gravure and flexography are also covered. The document concludes with a high-level summary of the various printing techniques.
Offset printing has the largest range of printing products, from visiting cards to newspapers, magazines, catalogues or illustrated books.
We distinguish between sheet offset printing and web offset printing.
The document discusses web offset printing. Web offset printing uses a continuous roll of paper fed through the printing press. There are two methods of drying - heat set uses forced air heating to dry ink rapidly, while cold set relies on natural evaporation and absorption to dry ink more slowly. The document focuses on web offset printing, describing characteristics like high printing speeds up to 900 meters per minute and applications including books, magazines, newspapers, and catalogs.
This document provides an overview of paper properties and their impact on the printing process. It discusses the paper making process, key paper properties like basis weight, caliper, formation, surface sizing and optical properties. It explains how these properties affect aspects like ink absorption, print quality, smoothness and strength. The document also covers specialty paper grades and educational resources for further understanding paper.
Screen printing uses stencils to transfer images onto surfaces through a fabric screen. The stencil blocks ink from passing through in some areas while allowing it in others to create the image. Carousel screen printing uses multiple screens on a rotating mechanism to print with different colors more quickly and efficiently. Screen printing is commonly used to apply graphics and logos to products. Photocopying uses a dry toner instead of liquid ink in a non-contact printing process, allowing images to be reproduced in different sizes. Gravure printing employs an engraved plate to hold ink which is applied to paper to create high-quality art and photography books. Offset lithography uses oil and gum to divide a smooth plate surface into ink-accepting and ink
This document provides an overview of flexography, a modern letterpress printing technique. It discusses the history of flexography, which began in England using aniline oil-based inks. Over time, advances were made in platemaking and inks, allowing flexography to rival offset printing quality. Modern flexography uses photopolymer plates instead of rubber plates, and water-based inks have replaced traditional inks containing ammonia and alcohol. The document also outlines the flexography printing process and applications in food and flexible packaging industries.
Sublimation vs Digital Printing By Sukhvir SabharwalSukhvir Sabharwal
Dear All,
Pls see actual process of sublimation and digital with their advantage & disadvantage along with comparison.
Hope this would help you !
Courtesy- Mr. PK Aggarwal
Best,
Sukhvir
The document summarizes the effects of stock treatment, drying, and recycling on fiber properties. It discusses how mill pulps have shorter, less uniformly delignified fibers than laboratory pulps due to mechanical damage. Drying fibers causes further strength loss. Recycled fibers have even lower strength due to increased damage. Refining improves fiber bonding but also causes defects. Proper electrostatic conditions and minimizing turbulence can improve strength. Fiber fines and properties like length, fibrillation, and curl strongly influence paper strength.
Delamination refers to the separation of layers in printing stock like paper or cardboard. It can be caused by issues during cutting, stacking, or unrolling of paper. Precautions like carefully cutting paper, discarding bottom sheets, and using wedges or probes gently can prevent delamination. For example, in one print shop delamination was traced to a mispositioned cutter bar damaging sheet edges, causing strips to roll up during processing. Identifying the problem sheet can help determine if the cause was cutting, stacking, or something earlier in the paper making process.
The document compares various printing technologies and provides details on several processes. It summarizes:
1) Several analog printing processes including silk screen, offset, letterpress, and gravure printing.
2) Details of offset printing units and processes.
3) The history and current state of reel offset printing including increasing speeds up to 50,000 revolutions per hour.
4) Digital printing processes like electrophotography, inkjet, magnetography, nanography, and thermoprocessing.
5) Specific high-speed presses using these technologies from companies like HP, Xerox, Kodak, and Océ.
There are two main types of mottling that can occur in printing:
1. Optical mottling, usually seen with high brightness glossy papers, makes the paper look dirty due to unwanted variations in optical properties.
2. Water induced mottling occurs when water from previous printing units does not fully absorb into the coating before ink transfer, or when ink cannot fully emulsify surface water.
Backtrap mottling is caused by an uneven pore structure in the coating layer, resulting in variations in the thickness of set and unset ink that follows the coating profile. It is always present to some degree but usually well controlled.
This document discusses various paper properties including color space, measuring methods, thickness, bulk, formulas, machine direction, humidity, temperature effects on acclimatization time, classifications of coated and uncoated papers for printing, and technical support contact information. It provides information on paper testing methods, calculations, recommendations, and classifications.
The paper and pulp industry is a vital sector of the global economy, producing a wide range of products used in everyday life such as printing and writing paper, tissue paper, packaging materials, and many more. The industry plays a significant role in providing employment and supporting local economies, as well as driving technological innovation and development. However, it also has a significant environmental impact, including deforestation, water pollution, and air pollution.
The process of producing paper and pulp begins with the harvesting of wood. Trees are cut down and transported to a pulp mill, where they are debarked and chipped into small pieces. These wood chips are then cooked in a chemical solution to remove the lignin, a substance that binds the wood fibers together. The resulting material, called pulp, is a slurry of fibers that can be used to make a wide variety of paper and paper-based products. This process is energy-intensive and can have a significant environmental impact (Keshav, 2014).
The paper and pulp industry is a major contributor to the global economy, with an estimated value of around $200 billion USD, and it is highly competitive, with a large number of companies operating globally. Some of the leading companies in the industry include International Paper, Asia Pulp & Paper, and Stora Enso (KPMG, 2018).
In Nigeria, the paper and pulp industry is one of the oldest and most established sectors, dating back to the early 20th century. The industry has been facing several challenges in recent years, including a lack of investment in new technology, insufficient raw materials, and high energy costs. Despite these challenges, the industry has been showing signs of recovery in recent years, with a number of new projects and investments being announced (Nigeria Investment Promotion Commission, 2020).
One of the major challenges facing the paper and pulp industry globally and in Nigeria is the growing demand for digital media, which has led to a decline in the demand for traditional paper products. This has put pressure on companies in the industry to adapt by developing new products and expanding into new markets. However, the demand for paper and pulp products is still high in developing countries, including Nigeria (KPMG, 2018).
In terms of sustainability, the paper and pulp industry is one of the major contributors to deforestation and air pollution. The industry has been criticized for its environmental impact, particularly its contribution to deforestation, water pollution, and air pollution. Companies in the industry have been working to reduce their environmental impact by using more sustainable sourcing practices, such as using recycled paper and pulp, and by improving their energy efficiency (Keshav, 2014).
Presentation on green chemistry in gravure printingAdesh Katariya
Growing concern for the Global warming leading to green house effect is the result of excessive use of solvents and pollutants in the atmosphere.
This presentation is based on risks of chemicals used in gravure printing , details are for toxicological, Eco-toxicological concerns.
This document discusses differences between hardwood and softwood fibers used for papermaking. Hardwood fibers are shorter and thinner than softwood fibers. Softwoods contain mostly fibers (tracheids) which form the fiber network in paper, while hardwoods also contain vessel and ray cells which can cause issues. Fiber length, diameter, cell wall thickness and wood density impact paper properties like strength, bulk, and formation. The roles of different pulps, fillers and additives in achieving desired paper qualities are also reviewed. Optimal mechanical pulps for printing papers contain fibrillated fibers, fines, and few shives.
The document provides an overview of modern papermaking processes. It covers various paper and board grades, their compositions, and the properties contributed by different fiber types. The papermaking process is described, including stock preparation, forming, pressing, drying, and finishing. Recovered fiber usage and deinking processes are also discussed. Key factors that influence paper quality such as fiber length and type are explained.
The document discusses various printing techniques including etching, intaglio, linocut, screen printing, woodcut, lithography, letterpress, gravure, photocopying, laser printing, inkjet printing, and desktop publishing. Etching involves using acid to etch a design onto a metal plate. Intaglio techniques such as engraving incise an image onto a surface. Linocut and woodcut similarly cut designs but into linoleum or wood blocks. Screen printing uses a stencil to push ink through a mesh. Photocopying and laser printing use photoconductive drums and charged toner. Inkjet printing shoots jets of ink directly onto paper. Desktop publishing involves layout of documents intended for print.
The document provides information about rollers used in inking and dampening systems for printing presses. It discusses roller manufacture, including how plasticizers and vulcanization agents determine hardness. It also covers proper roller storage, maintenance through cleaning, and potential issues like glazing. The document explains how to adjust the inking and dampening systems, including using press strips to set roller gaps and balance ink and water. It provides details on the Alcolor, Ecocolor, and other dampening systems and their adjustment.
Computer to plate (CTP) technology directly images printing plates using lasers rather than first exposing film. This eliminates film processing and improves image quality with less dot gain. CTP uses platesetters with flatbed, internal drum, or external drum designs to image plates. Common plate materials include aluminum and photopolymer plates. Thermal lasers and GLV technologies provide high-quality, high-speed imaging. CTP offers advantages like reduced time and errors, easier changes, and more efficient digital file storage compared to conventional film workflows. New advances are eliminating the plate entirely in some systems.
Printing is one of those inventions that have revolutionized our world and is the most important fundamental practices in our society. Nothing is more essential to civilization intellectually or commercially, than printing. Printing is widely used in our society to pass on information and to decorate objects. Printing is a process for reproducing text and images, typically with ink on paper using a printing press. It is often carried out as a large scale industrial process, and is an essential part of publishing and transaction printing.
Tags
Aluminium Offset Printing Plate, Aluminum Printing Plate, Application of Screen Printing, cheap ways to do screen printing, Computer Forms & Security Printing Press, desktop publishing tutorial, Digital Printing Inks, flexographic printing business plan, Flexographic Printing Inks, Flexographic Printing: Technical Process, Flexography Printing Process, Gravure Printing industry, gravure printing process, gravure printing technology pdf, Great Opportunity for Startup, How to Make a Screen Print, how to make offset printing plate full processes, how to set up a printing press business, How to Start a Printing Press Business - Startup Business, How to Start a Successful Printing Press Business, How to Start My Own Small Printing Business, How to Start Printing Industry in India, How to Start Up a Printing Business, Modern Printing Process, Modern Printing Technology book, Modern Printing Technology, Modern Technology of Printing & Writing Inks, Most Profitable Printing Business Ideas, Offset printing plates, offset printing press business plan, Offset printing technology, Offset Printing: Start Your Business, Opening a Printing Press Business, Pad Printing Inks, Printing and paper Technology, Printing Based Small Scale Industries, printing business ideas in India, Printing Business, Printing Industry in India, printing inks types, printing press business ideas, printing press business plan, Printing processes: Offset, Flexo, Gravure, Printing Technologies –Flexo Printing –Gravure Printing, Process technology books, Profitable Small Scale Printing Business, project for startups, Rotogravure printing - Rotogravure printing process, Scrap Offset Printing Aluminium PS Plate, Screen Printing Inks, screen printing process, Screen Printing Techniques, screen printing tutorial, Security Printing and Integrated Forms, Security Printing, Setting up and opening your Printing Business, Small Start-up Business Project, Start a Security Printing Business, Start up India, Stand up India, Starting a Printing Business, Starting an Offset Printing Press, Start-up Business Plan for Printing Process, startup ideas, Startup Project for Printing Business, startup project plan, Web Offset Machines, What Equipment Do I Need to Start a Printing Business?, What is Desktop Publishing?,
The document describes the key components and processes of a paper machine. It discusses the wet end which includes stock preparation and transport to the headbox. It then explains the headbox, wire section for initial dewatering, press section for further dewatering including conventional, German and shoe presses. Drying sections are described next for heating and drying the paper web. A size press is included to make the surface water repellent before winding the finished paper onto large reels. Water is circulated throughout the entire papermaking process.
This document discusses how friction affects various stages of the papermaking process and product quality. It provides background on friction forces in papermaking and how coefficients of friction can impact winding efficiency and quality. The document then examines how different paper chemicals, fillers, and components from wood extractives can increase or decrease the coefficient of friction in paper. Maintaining consistent friction throughout the papermaking process is important for optimal performance.
1) Printing inks are made up of pigments, resins, solvents, and additives that are mixed and ground to impart color and bind the ink.
2) Inks are manufactured through a process of preparing varnishes from resins and solvents and then dispersing pigments evenly throughout the varnish.
3) Common printing processes include letterpress, screen, flexography, and gravure printing which utilize the inks to transfer images onto substrates through different techniques.
The document discusses dampening solutions used in offset printing. It provides information on:
1) The ideal properties of a dampening solution including a water hardness of 8-12°dH and a pH balance of 4.8-5.5.
2) The various components of water that affect its quality for use in dampening solutions and how additives can help adjust the pH balance and prevent issues.
3) How to test the alcohol content of dampening solutions using an areometer to measure volume and temperature, which impact conductivity.
4) The importance of wetting plates adequately and how alcohol is commonly used as a wetting agent to lower surface tension despite its evaporation effects.
This document provides an overview of flexography, a modern letterpress printing technique. It discusses the history of flexography, which began in England using aniline oil-based inks. Over time, advances were made in platemaking and inks, allowing flexography to rival offset printing quality. Modern flexography uses photopolymer plates instead of rubber plates, and water-based inks have replaced traditional inks containing ammonia and alcohol. The document also outlines the flexography printing process and applications in food and flexible packaging industries.
Sublimation vs Digital Printing By Sukhvir SabharwalSukhvir Sabharwal
Dear All,
Pls see actual process of sublimation and digital with their advantage & disadvantage along with comparison.
Hope this would help you !
Courtesy- Mr. PK Aggarwal
Best,
Sukhvir
The document summarizes the effects of stock treatment, drying, and recycling on fiber properties. It discusses how mill pulps have shorter, less uniformly delignified fibers than laboratory pulps due to mechanical damage. Drying fibers causes further strength loss. Recycled fibers have even lower strength due to increased damage. Refining improves fiber bonding but also causes defects. Proper electrostatic conditions and minimizing turbulence can improve strength. Fiber fines and properties like length, fibrillation, and curl strongly influence paper strength.
Delamination refers to the separation of layers in printing stock like paper or cardboard. It can be caused by issues during cutting, stacking, or unrolling of paper. Precautions like carefully cutting paper, discarding bottom sheets, and using wedges or probes gently can prevent delamination. For example, in one print shop delamination was traced to a mispositioned cutter bar damaging sheet edges, causing strips to roll up during processing. Identifying the problem sheet can help determine if the cause was cutting, stacking, or something earlier in the paper making process.
The document compares various printing technologies and provides details on several processes. It summarizes:
1) Several analog printing processes including silk screen, offset, letterpress, and gravure printing.
2) Details of offset printing units and processes.
3) The history and current state of reel offset printing including increasing speeds up to 50,000 revolutions per hour.
4) Digital printing processes like electrophotography, inkjet, magnetography, nanography, and thermoprocessing.
5) Specific high-speed presses using these technologies from companies like HP, Xerox, Kodak, and Océ.
There are two main types of mottling that can occur in printing:
1. Optical mottling, usually seen with high brightness glossy papers, makes the paper look dirty due to unwanted variations in optical properties.
2. Water induced mottling occurs when water from previous printing units does not fully absorb into the coating before ink transfer, or when ink cannot fully emulsify surface water.
Backtrap mottling is caused by an uneven pore structure in the coating layer, resulting in variations in the thickness of set and unset ink that follows the coating profile. It is always present to some degree but usually well controlled.
This document discusses various paper properties including color space, measuring methods, thickness, bulk, formulas, machine direction, humidity, temperature effects on acclimatization time, classifications of coated and uncoated papers for printing, and technical support contact information. It provides information on paper testing methods, calculations, recommendations, and classifications.
The paper and pulp industry is a vital sector of the global economy, producing a wide range of products used in everyday life such as printing and writing paper, tissue paper, packaging materials, and many more. The industry plays a significant role in providing employment and supporting local economies, as well as driving technological innovation and development. However, it also has a significant environmental impact, including deforestation, water pollution, and air pollution.
The process of producing paper and pulp begins with the harvesting of wood. Trees are cut down and transported to a pulp mill, where they are debarked and chipped into small pieces. These wood chips are then cooked in a chemical solution to remove the lignin, a substance that binds the wood fibers together. The resulting material, called pulp, is a slurry of fibers that can be used to make a wide variety of paper and paper-based products. This process is energy-intensive and can have a significant environmental impact (Keshav, 2014).
The paper and pulp industry is a major contributor to the global economy, with an estimated value of around $200 billion USD, and it is highly competitive, with a large number of companies operating globally. Some of the leading companies in the industry include International Paper, Asia Pulp & Paper, and Stora Enso (KPMG, 2018).
In Nigeria, the paper and pulp industry is one of the oldest and most established sectors, dating back to the early 20th century. The industry has been facing several challenges in recent years, including a lack of investment in new technology, insufficient raw materials, and high energy costs. Despite these challenges, the industry has been showing signs of recovery in recent years, with a number of new projects and investments being announced (Nigeria Investment Promotion Commission, 2020).
One of the major challenges facing the paper and pulp industry globally and in Nigeria is the growing demand for digital media, which has led to a decline in the demand for traditional paper products. This has put pressure on companies in the industry to adapt by developing new products and expanding into new markets. However, the demand for paper and pulp products is still high in developing countries, including Nigeria (KPMG, 2018).
In terms of sustainability, the paper and pulp industry is one of the major contributors to deforestation and air pollution. The industry has been criticized for its environmental impact, particularly its contribution to deforestation, water pollution, and air pollution. Companies in the industry have been working to reduce their environmental impact by using more sustainable sourcing practices, such as using recycled paper and pulp, and by improving their energy efficiency (Keshav, 2014).
Presentation on green chemistry in gravure printingAdesh Katariya
Growing concern for the Global warming leading to green house effect is the result of excessive use of solvents and pollutants in the atmosphere.
This presentation is based on risks of chemicals used in gravure printing , details are for toxicological, Eco-toxicological concerns.
This document discusses differences between hardwood and softwood fibers used for papermaking. Hardwood fibers are shorter and thinner than softwood fibers. Softwoods contain mostly fibers (tracheids) which form the fiber network in paper, while hardwoods also contain vessel and ray cells which can cause issues. Fiber length, diameter, cell wall thickness and wood density impact paper properties like strength, bulk, and formation. The roles of different pulps, fillers and additives in achieving desired paper qualities are also reviewed. Optimal mechanical pulps for printing papers contain fibrillated fibers, fines, and few shives.
The document provides an overview of modern papermaking processes. It covers various paper and board grades, their compositions, and the properties contributed by different fiber types. The papermaking process is described, including stock preparation, forming, pressing, drying, and finishing. Recovered fiber usage and deinking processes are also discussed. Key factors that influence paper quality such as fiber length and type are explained.
The document discusses various printing techniques including etching, intaglio, linocut, screen printing, woodcut, lithography, letterpress, gravure, photocopying, laser printing, inkjet printing, and desktop publishing. Etching involves using acid to etch a design onto a metal plate. Intaglio techniques such as engraving incise an image onto a surface. Linocut and woodcut similarly cut designs but into linoleum or wood blocks. Screen printing uses a stencil to push ink through a mesh. Photocopying and laser printing use photoconductive drums and charged toner. Inkjet printing shoots jets of ink directly onto paper. Desktop publishing involves layout of documents intended for print.
The document provides information about rollers used in inking and dampening systems for printing presses. It discusses roller manufacture, including how plasticizers and vulcanization agents determine hardness. It also covers proper roller storage, maintenance through cleaning, and potential issues like glazing. The document explains how to adjust the inking and dampening systems, including using press strips to set roller gaps and balance ink and water. It provides details on the Alcolor, Ecocolor, and other dampening systems and their adjustment.
Computer to plate (CTP) technology directly images printing plates using lasers rather than first exposing film. This eliminates film processing and improves image quality with less dot gain. CTP uses platesetters with flatbed, internal drum, or external drum designs to image plates. Common plate materials include aluminum and photopolymer plates. Thermal lasers and GLV technologies provide high-quality, high-speed imaging. CTP offers advantages like reduced time and errors, easier changes, and more efficient digital file storage compared to conventional film workflows. New advances are eliminating the plate entirely in some systems.
Printing is one of those inventions that have revolutionized our world and is the most important fundamental practices in our society. Nothing is more essential to civilization intellectually or commercially, than printing. Printing is widely used in our society to pass on information and to decorate objects. Printing is a process for reproducing text and images, typically with ink on paper using a printing press. It is often carried out as a large scale industrial process, and is an essential part of publishing and transaction printing.
Tags
Aluminium Offset Printing Plate, Aluminum Printing Plate, Application of Screen Printing, cheap ways to do screen printing, Computer Forms & Security Printing Press, desktop publishing tutorial, Digital Printing Inks, flexographic printing business plan, Flexographic Printing Inks, Flexographic Printing: Technical Process, Flexography Printing Process, Gravure Printing industry, gravure printing process, gravure printing technology pdf, Great Opportunity for Startup, How to Make a Screen Print, how to make offset printing plate full processes, how to set up a printing press business, How to Start a Printing Press Business - Startup Business, How to Start a Successful Printing Press Business, How to Start My Own Small Printing Business, How to Start Printing Industry in India, How to Start Up a Printing Business, Modern Printing Process, Modern Printing Technology book, Modern Printing Technology, Modern Technology of Printing & Writing Inks, Most Profitable Printing Business Ideas, Offset printing plates, offset printing press business plan, Offset printing technology, Offset Printing: Start Your Business, Opening a Printing Press Business, Pad Printing Inks, Printing and paper Technology, Printing Based Small Scale Industries, printing business ideas in India, Printing Business, Printing Industry in India, printing inks types, printing press business ideas, printing press business plan, Printing processes: Offset, Flexo, Gravure, Printing Technologies –Flexo Printing –Gravure Printing, Process technology books, Profitable Small Scale Printing Business, project for startups, Rotogravure printing - Rotogravure printing process, Scrap Offset Printing Aluminium PS Plate, Screen Printing Inks, screen printing process, Screen Printing Techniques, screen printing tutorial, Security Printing and Integrated Forms, Security Printing, Setting up and opening your Printing Business, Small Start-up Business Project, Start a Security Printing Business, Start up India, Stand up India, Starting a Printing Business, Starting an Offset Printing Press, Start-up Business Plan for Printing Process, startup ideas, Startup Project for Printing Business, startup project plan, Web Offset Machines, What Equipment Do I Need to Start a Printing Business?, What is Desktop Publishing?,
The document describes the key components and processes of a paper machine. It discusses the wet end which includes stock preparation and transport to the headbox. It then explains the headbox, wire section for initial dewatering, press section for further dewatering including conventional, German and shoe presses. Drying sections are described next for heating and drying the paper web. A size press is included to make the surface water repellent before winding the finished paper onto large reels. Water is circulated throughout the entire papermaking process.
This document discusses how friction affects various stages of the papermaking process and product quality. It provides background on friction forces in papermaking and how coefficients of friction can impact winding efficiency and quality. The document then examines how different paper chemicals, fillers, and components from wood extractives can increase or decrease the coefficient of friction in paper. Maintaining consistent friction throughout the papermaking process is important for optimal performance.
1) Printing inks are made up of pigments, resins, solvents, and additives that are mixed and ground to impart color and bind the ink.
2) Inks are manufactured through a process of preparing varnishes from resins and solvents and then dispersing pigments evenly throughout the varnish.
3) Common printing processes include letterpress, screen, flexography, and gravure printing which utilize the inks to transfer images onto substrates through different techniques.
The document discusses dampening solutions used in offset printing. It provides information on:
1) The ideal properties of a dampening solution including a water hardness of 8-12°dH and a pH balance of 4.8-5.5.
2) The various components of water that affect its quality for use in dampening solutions and how additives can help adjust the pH balance and prevent issues.
3) How to test the alcohol content of dampening solutions using an areometer to measure volume and temperature, which impact conductivity.
4) The importance of wetting plates adequately and how alcohol is commonly used as a wetting agent to lower surface tension despite its evaporation effects.
Offset printing is one of the best latest computerized method. China sign co offer offset printer services at competitive prices , For more information contact at http://www.chinasignco.com
The document discusses test forms from Fogra and Heidelberg that can help identify problems in print quality by highlighting issues and their causes. It describes how Fogra developed a dampening control test form that allows printers to check and correctly regulate dampening solution application in order to achieve stable printing conditions. The test procedure involves first setting solid colors using ink density, then reducing dampening to the point of smearing while maintaining full toning to find the ideal balance of ink and dampening solution.
Offset printing is a technique where the inked image is transferred from a printing plate to a rubber blanket and then to the printing surface. It was invented in the late 19th century as photography became popular. Some of the key developments included the first rotary offset lithographic printing press being created in England in 1875 and the discovery in 1901 that using a rubber roller produced clearer images than metal. The main advantages of offset printing are consistent high image quality, quick plate production, long plate life, and low cost. The common offset printing process involves using light-sensitive chemicals and photography to transfer images from original materials to printing plates.
The document provides an overview of fountain solutions and their functions in the printing process. It discusses the components of fountain solutions, including water soluble gums, pH buffers, desensitizing salts, and other additives. It explains how fountain solutions desensitize non-image areas of plates, clean plates, spread solutions evenly, and maintain proper ink emulsification. The document also addresses the importance of water quality, describing treatments like reverse osmosis and demineralization. It notes potential problems if too much or too little fountain concentrate is used and the effects of hardened, cracked, swollen, or calcified rollers without proper cleaners.
Heidelberg Tips & Tricks- Ink & Dampening Solution in Balance.Heidelberg India
Fogra developed a dampening control test form to help printers balance ink and dampening solution across printing units for ideal print quality. The test form features visual control patches that show if dampening levels are nearing critical conditions. Using the standardized test procedure, printers can set ink density and then adjust dampening in steps to identify the ideal range. The test form works on most press and stock combinations and allows printers to quickly recognize and correct unfavorable settings between printing units.
The blanket is a real all-rounder and lies at the heart of offset printing. It has to transfer text and graphic elements exactly from the printing plate to printing stock. An incredibly demanding task when you take a closer look at what all that involves.
The document discusses several common printing processes: photocopying/xerography, offset lithography, flexography, gravure, and screenprinting. For each process, it describes the basic steps, common applications, advantages, and disadvantages. Photocopying involves transferring an image onto paper using static electricity and light. Offset lithography uses inked plates to transfer images onto a rubber cylinder and then paper. Flexography is used for packaging and uses inked flexible plates to print. Gravure etching involves engraving images onto cylinders and filling the etched areas with ink. Screenprinting uses screens with blocked images to push ink onto fabrics or paper.
The document discusses sheet offset printing and the printing process. It explains that register marks are used to correctly position printing plates when colors are misaligned. It also mentions that densitometers or scanners are used to measure control strips and determine if more or less ink is needed in certain areas. Additionally, it notes that after printing, sheets may be cut in half before being folded in the folding machine to the uncut end size.
The document discusses several printing processes and their advantages and disadvantages:
1) Offset lithography allows for high quality printing on various papers and can print on both sides. However, it is susceptible to color variation.
2) Flexography is a high speed process but has difficulty reproducing fine detail and consistent color.
3) Gravure provides consistent color and works well on cheaper papers, but the printing plates and cylinders are expensive to produce. It is best for long print runs.
4) Screen printing is economical for short runs and stencils are easy to produce, but it has limited applications.
1. Common causes of dyeing defects include imperfect material preparation, improper water quality, and shortcomings in making the dyeing solution or operating the dye machinery.
2. Specific issues can arise from the fiber properties, use of carriers, differences in fiber structure and heat/tension during processing, residual chemicals, and inadequate dyeing conditions.
3. Dyeing problems like unlevelness, cloudiness, pale areas, and lack of reproducibility can result from many factors including unstable dyes, unsuitable dye combinations, imperfect pretreatment, fiber variations, and inconsistent dyeing programs or conditions. Attention to fiber properties and dyeing procedures is important to address common defects.
This technical bulletin discusses fountain solutions used in offset printing. It provides background on fountain solutions and their typical components, including acids, desensitizers, buffers, inhibitors and wetting agents. The document explains how pH and conductivity relate to fountain solution concentration and composition. It addresses how buffered solutions help maintain consistent pH levels and the importance of measuring both pH and conductivity. Frequently asked questions about alcohol use, conductivity guidelines, pH effects, and non-acidic fountain solutions are also covered.
Ghosting refers to darker glossy areas visible on the back of printed surfaces with high ink concentration. It occurs through contact between printed sheets in the pile and can only be identified after printing. To avoid ghosting, it is best to choose the right paper and ink combination through lab testing, as certain combinations encourage ghosting. The lab test involves printing test sheets and storing them like sandwiches to see if stripes printed on one sheet appear on the full surface sheet. Time intervals between printing and perfecting and between perfecting and finishing should also be short to reduce ghosting. A lab test can ensure the paper and ink combination will not cause ghosting during the printing process.
Ghosting in sheetfed offset printing refers to darker glossy areas appearing on the back of printed surfaces with high ink concentration. Ghosting occurs due to contact between printed sheets in the pile, as inks dry at different rates on different areas. To avoid ghosting, it is best to choose paper and ink combinations that do not encourage it, as identified through lab testing procedures involving printing test sheets and evaluating their appearance when stacked. The timing between printing, perfecting, and finishing is also important to control ghosting, as chemical bonds in inks can transfer to adjacent sheets during drying if intervals are too short. While methods like airing the pile can help, lab testing of materials provides the most reliable way to prevent ghosting
Ghosting in sheetfed offset printing refers to darker glossy areas visible on the back of printed surfaces with high ink concentration. It occurs through contact between printed sheets in the pile due to different drying speeds of inks. To avoid ghosting, it is best to choose the right paper and ink combination through lab testing, as certain combinations encourage ghosting. The lab test involves printing test sheets and storing them like sandwiches to check for ghosting effects. Time intervals between printing, perfecting, and finishing also impact ghosting - shorter intervals reduce ghosting. A lab test can ensure the paper and ink combination will not cause ghosting during the printing process.
Ghosting and vanishing dots in heatset printingSappiHouston
Ghosting and vanishing dots are defects that have become more prominent in heatset web offset printing in recent years. They result from a microscopic build-up of ink and paper ingredients between halftone dots over time, which makes dot transfer from plate to blanket to paper more difficult. This causes the dots to decrease in size or even disappear. Many variables can contribute to the build-up, including paper properties, ink, fountain solution, plates and blankets, but the issues are multifactorial with complex interactions and no single cause has been identified. Sappi continues to research solutions through collaborative projects.
The document discusses various printing techniques categorized into hand printing, mechanical printing, and digital printing. Hand printing includes etching, linocut, screen printing, woodcut, and lithography. Mechanical printing consists of letterpress, gravure, and screen processes. Digital printing involves photocopying, laser printing, inkjet printing, and desktop publishing. Each technique is described in terms of its process, advantages, and disadvantages.
The document discusses different printing techniques including hand printing, mechanical printing, and digital printing. Hand printing techniques include linocut printing where a design is carved into linoleum and inked before being pressed onto paper. Mechanical printing includes gravure printing commonly used for labels and packaging due to its photographic quality. Digital printing includes photocopying, which is widely used in business for duplicating images in a quick and cheap process, though ink can be expensive.
Hand printing techniques like linocut involve carving a design into linoleum and printing it onto paper or fabric by inking the surface and pressing it. This allows for carving, printing, embossing, and rubbing but mistakes are irreversible. Mechanical printing techniques like gravure are commonly used for packaging and labels and provide photographic quality prints but require expensive engraved cylinders. Digital printing involves photocopying documents and images and has advantages of quick duplication but ink can be expensive.
Techniques and technology used in print productionsophiemason
The document describes various print production techniques and technologies, including hand techniques like etching, linocut, screen printing, woodcut, and lithography. It provides details on the processes involved and advantages and disadvantages of each. Technologies like letterpress, gravure, screen processing, photocopying, laser printing, inkjet, and desktop publishing are also summarized with their characteristics.
The document discusses various printmaking techniques including etching, linocut, screen printing, woodcut, lithography, letterpress, gravure, screen process, photocopying, laser printing, inkjet printing, and desktop publishing. For each technique it provides details on the method, advantages, and disadvantages. Examples of each technique are also listed at the end.
The document discusses various printmaking methods including etching, screen printing, lithography, linocut, letterpress, woodcut, screen process, gravure, photocopying, laser printing, inkjet printing, and desktop publishing. For each method, it provides details on the process and notes advantages and disadvantages. Screen printing allows many prints to be created before reapplying ink but images must be simple. Lithography is fast and cheap but cannot produce high quality prints. Desktop publishing uses computers and software to combine text and artwork for print or web.
“What you see is not always what you get”
Truer words were never spoken when it comes to managing
expectations for printed material. The following presentation gives an overview of print realities, and sets out guidelines to help navigate the complex world of print.
“What you see is not always what you get.” Truer words were never spoken when it comes to managing expectations for printed material. This toolkit identifies the biggest challenges in print production to help you navigate the complex world of print.
Challenge #1 Colour: CYMK vs. RGB vs. Pantone
Challenge #2 Printing methods: Offset vs. Gravure vs. Flexo
Challenge #3 Substrate
Challenge #4 Dot gain
There are several types of printing methods described in the document. Traditional methods include etching, linocut, woodcut, lithography, letterpress and gravure. Each have advantages like being suitable for mass production or high quality images, but can also be time consuming or difficult. Modern digital methods discussed are photocopying, laser printing, inkjet printing and desktop publishing. Laser printing provides high quality color printing while inkjet is fast but expensive. Desktop publishing allows individuals to self-publish using page layout software. Overall, different printing methods have tradeoffs between speed, cost and image quality.
The document summarizes various print techniques, categorizing them as etching, linocut, screen print, woodcut, lithography, letterpress, gravure, screen process, photocopying, laser printing, inkjet, and desktop publishing. Each technique is described briefly, outlining the method, advantages, and disadvantages. Etching involves using acid to cut a design into metal, linocut uses a knife to cut a design into linoleum, and screen print forces ink through a stencil onto material below.
Similar to Printing technology : problems sheetfed offset (10)
Economic Indicators and Monthly Overview October 2015SappiHouston
The document summarizes economic indicators and forecasts from Europe, the US, and Japan in October 2015. In Europe, GDP growth forecasts remained stable for 2015 but declined slightly for 2016, and industrial confidence increased slightly while consumer confidence declined. In the US, GDP forecasts remained the same for 2015 but declined slightly for 2016. Japan's GDP forecasts declined for both 2015 and 2016, and its credit rating was downgraded. The document also includes charts and data on topics like GDP, inflation, unemployment, and business climate indexes for various countries and regions.
Economic Indicators and Monthly Overview August 2015SappiHouston
The document provides an overview of recent economic indicators from Europe, the US, Japan, and Germany. It summarizes GDP forecasts, inflation rates, unemployment, industrial and consumer confidence indexes, and capacity utilization in the EU. Charts show trends in these indicators. The report also provides data on business climate indexes in Germany and worldwide from IFO and advertising expenditure forecasts from ZenithOptimedia.
Economic Indicators and Monthly Overview June 2015SappiHouston
The document provides an overview of recent economic indicators from Europe, the US, Japan, and Germany. It summarizes that GDP growth in the EU remained stable in 2015 but declined in the US due to harsh weather and a strong dollar. Industrial confidence in the EU improved slightly while consumer confidence declined. The German economy remains on track with recent data showing accelerated growth, though the IFO Business Climate Index edged downward.
Economic Indicators and Monthly Overview April 2015SappiHouston
The document provides an overview of recent economic indicators from Europe, the US, Japan, and globally. Key points include:
- GDP growth forecasts for Europe and Germany improved slightly, while forecasts declined for the US and Japan.
- Industrial confidence in the Eurozone rose again in March, and consumer confidence continued to improve significantly.
- Unemployment rates and inflation rates in the Eurozone are trending downward.
- The IFO Business Climate Index for Germany reached its highest level since July 2014, indicating continued economic expansion.
Economic indicators and Monthly Overview January 2015SappiHouston
The document provides an economic outlook for January 2015. It summarizes forecasts for GDP growth in Europe, the US, and Japan in 2015 and 2016. GDP growth is expected to be 1.5% in Europe in 2015 and 1.8% in 2016. In the US, GDP growth is forecast to be 3.2% in 2015 and 2.8% in 2016. Japan's GDP growth is projected to be 1.2% in 2015 and 1.5% in 2016. The document also reviews recent economic indicator data for the EU, Germany, and other regions.
The document provides an overview of recent economic indicators from Europe, the US, Japan and Germany. It summarizes that GDP growth forecasts for Europe and Japan were lowered for 2014 but raised slightly for Japan in 2015. Industrial and consumer confidence in the EU improved slightly in October, breaking prior downward trends. The IFO Business Climate Index for Germany continued to fall, indicating a deteriorating outlook for the German economy.
This document provides an economic overview and indicators for Europe, the US, Japan, and Germany from October 2014. It summarizes that GDP growth forecasts were lowered slightly for Europe and Japan, while the US forecast improved slightly. Industrial confidence and consumer confidence in Europe continued to decline in September. The German IFO Business Climate Index fell again, indicating the German economy is slowing. Charts show trends in GDP, inflation, unemployment, and other economic indicators for various regions.
Economic Indicators and Montly Overview September SappiHouston
The document provides an overview of recent economic indicators from Europe, the US, Japan and Germany. It summarizes data on GDP growth, unemployment, inflation, business and consumer confidence indexes. GDP growth forecasts for Europe in 2014 were lowered slightly due to stagnation in the Eurozone recovery. US GDP growth forecasts remained unchanged, while Japan's forecasts saw a small decrease and increase for 2014 and 2015 respectively. Several indexes tracking European industrial and consumer confidence declined further in August.
The document provides an overview of recent economic indicators from Europe, the US, Japan, and Germany. It summarizes GDP forecasts, business and consumer confidence indexes, unemployment and inflation rates. GDP growth is expected to be modest in Europe and the US in 2014, while forecasts for Japan remain stable. Several indexes for Germany fell slightly in June due to concerns about the impact of crises in Ukraine and Iraq. Advertising growth forecasts from Zenith also are included, with global growth expected to be 4.7% in 2014.
The document provides an overview of recent economic indicators from Europe, the US, Japan, and Germany. Key points include: the GDP growth forecast for the EU remained stable at 1.5% for 2014 but decreased for the US; the ECB cut interest rates to stimulate lending; consumer confidence in the EU continued to improve while Germany's business climate index fell slightly; and global advertising growth is projected to increase by 4.9% in 2014.
The document provides an overview of recent economic indicators from Europe, the US, Japan, and global advertising trends. It summarizes GDP forecasts, economic confidence indexes, inflation rates, and unemployment in key regions. Recent data points to positive but uneven growth returning to the Eurozone. The ECB is expected to cut interest rates further to boost low inflation. The US economy showed mixed results in Q1 2014 due to weather impacts. Japanese consumer spending increased sharply ahead of a sales tax hike. Global advertising is forecast to grow 5.1% in 2014 led by digital media, especially in emerging markets.
Economic indicators april 2014 houstonSappiHouston
The document provides an overview of recent economic indicators from Europe, the US, Japan and Germany. It summarizes GDP forecasts which remained positive for Europe and the US but fell slightly for Japan. It also reviews recent economic data on industrial confidence, unemployment, inflation and other indicators, which were mostly stable or improving. However, the IFO Business Climate index for Germany fell in March due to concerns about emerging markets and events in Crimea.
The document provides an overview of recent economic indicators from Europe, the US, Japan and Germany. It summarizes GDP growth forecasts which were improved slightly for Europe but decreased for the US and Japan. Unemployment and industrial confidence indicators for Europe are also discussed. Key points about advertising growth forecasts from Zenith are presented.
The document provides an overview of recent economic indicators from Europe, the US, Japan and Germany. It summarizes GDP forecasts, inflation rates, unemployment, consumer confidence indexes and other metrics. According to the document, GDP growth is expected to improve in the US and Eurozone in 2014, while Japan's GDP forecast was lowered slightly. Inflation remains a concern in the Eurozone. The German economy started 2014 promisingly with rising business sentiment indicators.
The document provides an overview of recent economic indicators and forecasts from various sources. It summarizes that consensus GDP forecasts for major economies remained largely unchanged, while industrial confidence in the EU improved and consumer confidence declined slightly. The IFO Business Climate Index for Germany rose significantly on improved current business assessments and expectations. Zenith data showed global advertising expenditures are forecast to grow 4.9% in 2013 and 5.1% in 2014.
The document provides an overview of recent economic indicators and forecasts from Europe, the US, Japan, and Germany in October 2013. Key points include:
- The Eurozone GDP growth forecast remained flat at 0.0% for 2013 and 1.3% for 2014, while the ECB unexpectedly cut interest rates to 0.25% due to deflation concerns.
- US GDP growth was revised up to 1.7% for 2013 and remained at 2.6% for 2014 following stronger than expected third quarter growth.
- Japan's GDP forecast remained unchanged at 1.9% for 2013 but declined slightly to 1.6% for 2014, despite other improving economic parameters.
- The IFO Business Climate Index
This document provides contact information for specialists at Sappi who can assist with technical issues in various languages and regions. It lists representatives for different countries and language groups in Europe, the Middle East, Africa, and the United Kingdom, along with their names and email addresses. It encourages contacting Sappi for any needed assistance and directs to their website for additional paper and printing knowledge.
The document provides an economic outlook overview for October 2013. It summarizes consensus GDP forecasts for Europe, the US, and Japan. For Europe, it notes improving industrial and consumer confidence in the EU, while the ECB kept interest rates unchanged. In the US, recovery has been hurt by the government shutdown. Japan took a small step to reduce debt by raising sales tax. Charts show historical GDP, inflation, unemployment, and other economic indicator trends in the EU. The report also summarizes IFO and Zenith economic indicator forecasts.
ContiVision - Web Break Analysis SystemSappiHouston
ContiVision is a system that automatically analyzes web breaks during the printing process. It determines the time, location, process circumstances, and most probable cause of each web break. This allows printers to optimize their process, prevent recurring breaks, and claim breaks caused by paper faults. The system collects data from sensors and cameras to analyze each break and produce a report with evidence to determine the root cause.
The document provides an economic outlook overview for September 2013. Key points include:
- GDP growth forecasts improved slightly for the Eurozone, US, and Japan. Recent data also indicates the Eurozone recovery is being maintained.
- Several economic indicators show improvements, such as industrial confidence and consumer confidence rising in the Eurozone. The IFO Business Climate Index for Germany also continued to climb.
- Global ad expenditure is forecast to grow at a slower 3.5% in 2013 due to issues in Europe and South Korea, but a rebound is expected in 2014-2015, led by rising markets. Internet and mobile advertising are outpacing other media in growth.
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1. Printing Technology
Printing Problems Sheetfed Offset
Technical Support
1 | [Printing problems Sheetfed Offset] Sappi Fine paper Europe
2. Content
- Questions and check list in case of complaints
- Doubling effects
- Misregister
- Ghosting effects / Yellowing effects
- Rub resistance / Pick outs
- Mottling
- Scuff resistance / Carbonize
- Ink drying
2 | [Printing problems Sheetfed Offset]
3. Important questions in case of complaints
What is the problem?
Is printing still carried out or was the paper completely processed?
Was the printing process interrupted and another job taken into the
machine?
Is a further printing possible:
With a less good printing result?
With a lower production speed and/or more interruptions?
What are the estimated costs?
Is the entire job processed at once?
Is the supply of additional paper necessary?
In connection with the visit: how long is printing still carried out?
3 | [Printing problems Sheetfed Offset]
4. Doubling
Doubling characteristics:
The question is of doubling if an unintentional, shadow-shaped
colour point with small dimensions can be found at the artificial
printed screen point. Doubling is generated by the non-congruent
re-transfer of colour through the following rubber blanket.
Doubling:
4 | [Printing problems Sheetfed Offset]
5. Passer differences
Passer differences are caused by:
– Hygro-expansion of the printed stock
– Lack of plane position of the printed stock
– Technical error or failures of the printing machine
– Unfavourable climatic conditions
Printed stock
expansion
1. Printing colour
2. Printing colour
5 | [Printing problems Sheetfed Offset]
6. Passer differences
The following points should be checked:
– Longitudinal direction of the paper (use small web)
– Check fountain solution and reduce it, if possible
– Check the paper run of the printing machine (feeding)
– Check the winding-off
6 | [Printing problems Sheetfed Offset]
7. Ghost effect
Characteristics of the ghost effect:
A ghost effect is caused by an interaction of paper, printing colour
and production conditions. The printing pictures distinguish
themselves by released cleave products on the back of the sheet
lying above in the stack. We differ between matt-glossy-effect and
contact yellowing.
Paper Cleave
products
Printing colour
7 | [Printing problems Sheetfed Offset]
8. Matt-glossy-effect
Characteristics of the matt-glossy-effect:
The cleave products change the back of the sheet lying above in
the stack. If this back is now printed the colour drying is changed
at this point. By the different colour dryings, the matt-glossy-
effect is generated.
8 | [Printing problems Sheetfed Offset]
9. Contact yellowing
Characteristics of the contact yellowing:
The cleave products taken from the back react with the paper.
Strongly brightened papers are especially sensitive to contact
yellowing.
9 | [Printing problems Sheetfed Offset]
10. Ghost effect
The ghost effect appears completely accidental and
unexpected. A ghost effect may be avoided by the following
processes:
– Printing of bigger colour surfaces in the second form
printing
– Run of smaller stacks and provision of sufficient
aeration during drying (manual, stack changer)
– Use of concentrated colour to keep the colour
guidance as low as possible
10 | [Printing problems Sheetfed Offset]
11. Picking / parts breaking off
“Picking” is a tearing-out of coating particles or fibres from the
paper surface due to too high forces during colour cleaving.
Rubber blanket cylinder
Bulb formation
Printing colour before cleaving Colour cleaving
Printed Printed sheet tear-off angle
sheet Impression cylinder gripper
Printing zone width
Impression cylinder
11 | [Printing problems Sheetfed Offset]
12. Picking / parts breaking off
Reasons for the “picking” are:
– Poorly sized paper
– Too quick absorption of the printing colour
– Too continuous printing colour
– Printing room and machine too cold
– Too high printing speed
12 | [Printing problems Sheetfed Offset]
13. Irregular printing / mottling
This error appearance in the printing is caused by a non-uniform
absorption of the printing colour in the paper surface and, thus, a
non-uniform re-cleaving of the following printing material to the
rubber blanket (backtrap mottling).
Printing
colour
Coating
Basis paper
By changing the colour sequence, the printer may reduce or
prevent the mottling effect.
13 | [Printing problems Sheetfed Offset]
14. Scuffing / carbonising
Definition of the “scuff strength”:
Scuff strength is the resistance of a printing colour layer against
the mechanical stress due to pressure load and friction.
– Scuffing: colour soiling due to mechanical abrasion of
the printing colour film
– Carbonising: colour soiling due to the pressure load onto
the unprinted back of a printing object
in the stack or during cutting
14 | [Printing problems Sheetfed Offset]
15. Scuffing / carbonising
Difference:
Scuffing Carbonising
Average pressure with High pressure with very small
relatively long scuffing path strokes
(e.g. collating machine, folding (e.g. guillotine-type cutter, three cutter
machine, gather-stitcher) machine)
15 | [Printing problems Sheetfed Offset]
16. Scuffing / carbonising
Scuffing
Silk Matt
Carbonising
Silk Matt
16 | [Printing problems Sheetfed Offset]
17. Scuffing / carbonising
Especially in case of matt papers, the scuff strength is
influenced by the following factors:
Colours Fountain solution Paper
Oxidative drying Optimal 5-8% ISO Smooth surface
colours ph 5.5
Acid water, much ISO Coarse surface
Fresh colours
Powder Time
Starch powder Drying time, incl.
Scuff strength aeration
Mineral powder
Quick processing
Printing conditions Repro Book bindery
Stable continuous printing UCR Upright sheet feeder
without many stops good
400 % colour Horizontally laying
climate
sheet, pulled from the
Drying e.g. with IR at 1 point
bottom
17 | [Printing problems Sheetfed Offset]
18. Scuffing / carbonising
“Scuff strength” What is the printer capable to do?
Little or not influenced :
1. Placing of single-coloured and multicoloured figures.
2. Use and arrangement of special colours.
3. Realisation of an enamelling.
4. Realisation of a laminating.
5. Planning of a bigger paper size for co-printed colour bars.
18 | [Printing problems Sheetfed Offset]
19. Scuffing / carbonising
“Scuff strength” What is the printer capable to do?
1. Selection of the printing colour
– Use of so-called „scuff-resistant“colours
– No use of “box-fresh” printing colours
2. Determination of the colour sequence
– The colour printed last should always be yellow (function as lacquer printing)
3. Selection and dosing of printing auxiliaries
– Principally, no printing auxiliaries (oils, pastes, etc.) should be used
– The use of paint driers could be useful (dosing according to the manufacturer’s
recommendation)
4. Regulation of the fountain solution
– Alcohol share 8 - 10 %
– pH - value 5.3
5. Optimisation of the colour-water balance
– Damping adjustment slightly above the “lubrication limit”
– Perfect condition of colour and damping rolls
– Precise adjustment of colour and damping rolls
– Stabilisation of the colour-water balance by co-printed colour bars in case of poor
printing forms
6. “Correct” printing-dry-spraying
– Graining of the powder analogue to the basis weight of the paper
– No powder with “edged” structures (mineral powder)
– Use of powder with “round” structures” (starch powder)
– No powder on sugar basis
– The less powder, the better the scuff strength
7. Drying time
– The drying time between printing and further processing should amount to at least
48 hours
19 | [Printing problems Sheetfed Offset]
20. Drying of the colour
The drying of the printing colour is a criterion of the printability. In the sheet
offset printing drying colours are mostly used in an absorbing or oxidative
way.
The most important parameters are:
– The penetration or the physical absorption behaviour of the paper.
In this first phase, the coating of the paper shall provide the absorption of
the liquid parts of the colour binding agents in the paper, similar to the
function of a screen.
– The acidity or the alkalinity of the paper surface (expressed as pH-value),
which influences the chemical drying process of the binding agent
(oxidative drying).
The surface pH-value should be in the neutral or slightly alkali range in
case of coated paper ( 6.0).
– The relative stack humidity of the paper (approx. 50 % rel.).
– The topographic nature of the paper surface
20 | [Printing problems Sheetfed Offset]
21. Drying of the colour
The printing colour drying depends on the interaction with the humidity in the
offset printing.
Critical are:
– Too high fountain solution guidance
– Printing forms with poor colour consumption
– Wrongly dosed fountain solution binding agents
The colour absorption behaviour of the paper should not be adjusted too
quickly or too slowly.
In case of printing machines operating at a high speed, a deposit in the stack
should not occur, on the other hand, the colour absorption should not run too
quickly in view of 10 and 12 colour offset machines (danger of accumulation
and picking).
21 | [Printing problems Sheetfed Offset]