Sheet fed drying
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The document discusses ink drying in sheet-fed printing. It describes the physical and chemical parts of the drying process, including absorption of ink and oxidation of binders over several hours. It notes that siccatives and spray powder can accelerate drying by improving oxygen exposure and holding sheets apart. Problems like inadequate drying, silk screening issues, and cracking can occur if drying is not sufficient or heavier paper grades are used.
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The document discusses dental waxes, including their definition, history, properties, uses, sources, and classification. Dental waxes are low-melting esters used to make patterns, impressions, and other dental applications. Their properties like plasticity and low melting point make them suitable for these tasks. Waxes have been used in dentistry since ancient times and are still important today due to their low cost and properties. Common waxes include beeswax, carnauba, paraffin and other plant and mineral-based waxes.
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The document discusses different types of dental waxes, their properties, uses, and classifications. Key points include:
- Dental waxes can be natural, synthetic, or a blend and are used for patterns, impressions, bite registration, and other clinical and laboratory applications.
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- Common waxes discussed include inlay wax, casting wax, baseplate wax, boxing wax, utility wax, corrective wax, and bite registration wax.
- Ideal properties for dental waxes include dimensional stability when carved and no residue left during burnout
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denim presentation
Mercerized cotton shows improved rubbing fastness due to changes in fiber structure that reduce fiber removal by 30%. Protruding fibers can be removed with bio-polishing. Mature cotton fibers and combed yarns enhance rubbing fastness as they have fewer short fibers than carded yarns. Parameters that influence rubbing fastness include dye type and process, fiber type, finishes applied, and contact conditions like pressure and moisture. Backstaining can be reduced with dispersing agents or protease detergents.
Dental Waxes
Dental waxes are combinations of various types of waxes
compounded to provide desired physical properties. This presentation includes data on following subtopics of dental waxes: Definition
history, characteristic, classification of waxes, composition, uses of waxes and
properties.
use of waxes in dentistry/cosmetic dentistry course by Indian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Dental waxes/cosmetic dentistry course by Indian dental academy
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Chemical Processing Printing
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Wet processing of cellulose textiles.1
This pp elaborates the detail pretreatment processes and their mechanisms.Moreover it has useful conversion methods in it.
98738826 denim
This document summarizes the denim processing steps including desizing, abrasion, bleaching, and finishing. It defines key terms like denim fabric composition and dyeing methods. The processing involves both dry techniques like sandblasting and wet processes like enzyme washes using amylase, cellulase and other chemicals to break down starch, weaken fibers, and decolorize indigo for stonewashed effects. Proper chemicals, temperatures, pH and times are outlined for each wet processing step.
Introduction to wet processing
Wet processing involves treating fabrics under wet conditions using large amounts of water. It includes preparatory processes like singeing, desizing, and scouring to remove impurities from grey cloth. Then bleaching, dyeing, printing, and mercerization are carried out to impart color and properties. Finishing is done last to provide desirable appearance, feel, and durable functional properties. Wet processing transforms grey cloth into finished fabrics through chemical and mechanical treatments.
Ppt.pptx11111333442233443555444356655444
The document provides information about embedding and section cutting techniques in histopathology. It discusses the aims of embedding tissue, such as providing support and preventing distortion. Common embedding mediums include paraffin wax, resin, agar, and gelatin. Paraffin wax is the most popular due to being inexpensive, non-toxic, and allowing long term tissue storage. The document outlines the tissue embedding process and describes equipment used, including embedding molds and the Tissue-Tek system. Tissue orientation in the block is important for visualizing the desired morphology.
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fdocuments.in_denim-washes-final.ppt
1. Denim washing involves mechanical and chemical processes to enhance the aesthetic appeal and strength of denim fabric. Common mechanical processes include stone washing and microsanding which use abrasive materials like pumice stones.
2. Common chemical processes include denim bleaching using sodium hypochlorite, acid washing using acids, and enzyme washing using cellulases. Each process produces different fading and texture effects.
3. Recent developments aim to make denim washing more environmentally friendly and efficient, such as using enzymes instead of abrasives and developing quick wash cycles. Process control and minimizing pollution continue to be challenges.
Histotechnique - processing, embedding.pptx
Tissue processing involves removing water from tissue and replacing it with paraffin wax to provide rigidity for microscopic examination. The main steps are fixation, dehydration using increasing concentrations of alcohol, clearing with xylene to remove alcohol, and impregnation with molten paraffin wax. Automated tissue processors complete this process overnight using different stations for each step. Factors like tissue size, agitation, heat, and vacuum pressure influence effective processing. Ethyl alcohol is most commonly used for dehydration, while xylene is used for clearing prior to paraffin wax impregnation and embedding.
Runnability
Good runnability is connected to accumulations on the printing blanket versus the washing interval. Accumulations can affect runnability if the washing interval is reduced significantly, which can deteriorate print quality and risk blanket damage. Common accumulation problems include linting with uncoated papers, fibre picking with LWC papers related to shives, coating picking usually from issues in the papermaking process rather than surface strength, and carry-over piling related to ink tack and setting speed. Non-image area problems include dusting of pigment particles on matt and silk coated papers, milking from calcium or fountain solution problems, and ghosting/vanishing dots which is currently the most common problem in heatset printing though the mechanism is
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use of waxes in dentistry/cosmetic dentistry course by Indian dental academy
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Sheet fed drying
- 1. Ink drying in sheet-fed • Physical part (ink absorption, ink setting ) • Goal is to have enough setting that ink would not set-off in the delivery pile • Chemical Part (oxidation) • Oxidation of ink binder • Oxidative drying lasts for several hours depending on the type of ink and properties of the substrates • Drying agents (siccatives) will accelerate the drying process.
- 2. Spray powder • Spray is used to avoid ink set-off • Spray powder is the distance holder between the sheets. • It increases the amount of oxygen to improve the oxidative drying process. • Spray • 10 to 80 microns • calcium carbonate • organic, vegetable based powder of natural starch
- 3. Drying problems - sheet-fed • Inadequate drying • Similar smearing as in heatset if ink layer not dry enough • Silk grades • same problems but sheet-fed inks a bit better than heatset inks • Blistering, fibre roughening, waviness • does not occur • Cracking • also problem in sheet-fed • not due to drying but use of heavier grades