This document discusses different types of polymer fibers and their production methods. It begins by describing extrusion as a common way to shape polymers into fibers through a die. Two main fiber production methods are then covered: melt spinning, where fibers are extruded from a melt through a spinneret, and wet spinning, where polymers are extruded from a solution. Specific high-strength fibers are also summarized like Kevlar, polyethylene, and carbon fibers produced from polyacrylonitrile. The document aims to explain how polymer structure impacts fiber properties at the macro and microscale.
Fibers Forming Polymers and Polymer StructuresShaikh Alam
Fiber forming polymers are linear macromolecules that are usually suitable for making man-made fibers.
Based on molecular structure its divided by:
linear (end-to-end, flexible, like PVC, nylon)
branched
cross-linked (due to radiation, vulcanization, etc.)
network (similar to highly cross-linked structures)
This document discusses aramid fibers, which are aromatic polyamide fibers used to make materials like Kevlar and Nomex. It describes the two main types of aramid fibers - meta-aramids like Nomex and para-aramids like Kevlar. The document outlines their production process, properties, and applications. Aramid fibers are known for their high strength, heat resistance, and durability, making them useful for applications like protective clothing, tires, cables, and composites.
Gel spun high-performance polyethylene fibresFarshid Sh
Gel-spun polyethylene fibers, also called high-performance polyethylene (HPPE) fibers, are produced from ultra-high molecular weight polyethylene (UHMWPE) using a gel-spinning process. This process turns the viscous UHMWPE solution into a gel fiber that is then stretched into a highly oriented fiber with exceptional strength and stiffness properties. Common commercial examples of these fibers are Dyneema and Spectra. Their chemical resistance, strength, and flexibility make them suitable for demanding applications like ropes, protective fabrics, and medical implants.
Polyester fibers are long chain synthetic polymers composed of at least 85% ester units, most commonly polyethylene terephthalate (PET). PET is produced via the reaction of terephthalic acid and ethylene glycol. Polyester fibers are strong, durable, resistant to moisture and chemicals, and can be manufactured into filaments or staple fibers. They are widely used to make clothing, home furnishings, industrial products, and frequently blended with other fibers like cotton and wool.
High Performance Fibers- Aramid fibers- Their Spinning Techniques-Naveed Ahmed Fassana
A brief introduction of High Performance fibers and spinning techniques through which these fibers are produced are mentioned in these slides. Also there is a brief explanation of Aramid, Kevlar, and Nomex fibers with respect to their properties with the help of graphs etc.
This document provides information about acrylic fibers, including their production process. It discusses how acrylic fibers are made from polyacrylonitrile polymers through various polymerization methods like bulk, suspension, emulsion, and solution polymerization. The fibers are then produced through spinning processes like dry, wet, or solution spinning. Dry spinning involves evaporating the solvent in hot air, while wet spinning coagulates the fibers in a water bath. The document provides details on the historical development of acrylic fibers and their properties and applications.
Spun Laid Process, Melt Blown Process, Differences between spun laid Process ...MD. SAJJADUL KARIM BHUIYAN
The document provides information on the spun laid and melt blown processes for producing nonwoven fabrics from polymers. In the spun laid process, polymers are extruded through spinnerets to form fine filaments, which are then deposited randomly onto a conveyor belt and bonded. The melt blown process extrudes polymers through a die containing many small holes, and high-velocity air streams attenuate the extruded fibers to form very fine fibers that are deposited onto a collector. Key differences between the processes are that the spun laid process produces thicker fibers that are later bonded, while the melt blown process produces very fine fibers through fiber attenuation using hot air streams.
Fibers Forming Polymers and Polymer StructuresShaikh Alam
Fiber forming polymers are linear macromolecules that are usually suitable for making man-made fibers.
Based on molecular structure its divided by:
linear (end-to-end, flexible, like PVC, nylon)
branched
cross-linked (due to radiation, vulcanization, etc.)
network (similar to highly cross-linked structures)
This document discusses aramid fibers, which are aromatic polyamide fibers used to make materials like Kevlar and Nomex. It describes the two main types of aramid fibers - meta-aramids like Nomex and para-aramids like Kevlar. The document outlines their production process, properties, and applications. Aramid fibers are known for their high strength, heat resistance, and durability, making them useful for applications like protective clothing, tires, cables, and composites.
Gel spun high-performance polyethylene fibresFarshid Sh
Gel-spun polyethylene fibers, also called high-performance polyethylene (HPPE) fibers, are produced from ultra-high molecular weight polyethylene (UHMWPE) using a gel-spinning process. This process turns the viscous UHMWPE solution into a gel fiber that is then stretched into a highly oriented fiber with exceptional strength and stiffness properties. Common commercial examples of these fibers are Dyneema and Spectra. Their chemical resistance, strength, and flexibility make them suitable for demanding applications like ropes, protective fabrics, and medical implants.
Polyester fibers are long chain synthetic polymers composed of at least 85% ester units, most commonly polyethylene terephthalate (PET). PET is produced via the reaction of terephthalic acid and ethylene glycol. Polyester fibers are strong, durable, resistant to moisture and chemicals, and can be manufactured into filaments or staple fibers. They are widely used to make clothing, home furnishings, industrial products, and frequently blended with other fibers like cotton and wool.
High Performance Fibers- Aramid fibers- Their Spinning Techniques-Naveed Ahmed Fassana
A brief introduction of High Performance fibers and spinning techniques through which these fibers are produced are mentioned in these slides. Also there is a brief explanation of Aramid, Kevlar, and Nomex fibers with respect to their properties with the help of graphs etc.
This document provides information about acrylic fibers, including their production process. It discusses how acrylic fibers are made from polyacrylonitrile polymers through various polymerization methods like bulk, suspension, emulsion, and solution polymerization. The fibers are then produced through spinning processes like dry, wet, or solution spinning. Dry spinning involves evaporating the solvent in hot air, while wet spinning coagulates the fibers in a water bath. The document provides details on the historical development of acrylic fibers and their properties and applications.
Spun Laid Process, Melt Blown Process, Differences between spun laid Process ...MD. SAJJADUL KARIM BHUIYAN
The document provides information on the spun laid and melt blown processes for producing nonwoven fabrics from polymers. In the spun laid process, polymers are extruded through spinnerets to form fine filaments, which are then deposited randomly onto a conveyor belt and bonded. The melt blown process extrudes polymers through a die containing many small holes, and high-velocity air streams attenuate the extruded fibers to form very fine fibers that are deposited onto a collector. Key differences between the processes are that the spun laid process produces thicker fibers that are later bonded, while the melt blown process produces very fine fibers through fiber attenuation using hot air streams.
This document presents on dry-jet wet spinning. It discusses that dry-jet wet spinning is a modification of wet spinning where the spinning solution is extruded into air and drawn before being submerged in a coagulation bath. This allows benefits of both dry and wet spinning processes. Key aspects of dry-jet wet spinning covered include the extrusion through an air gap, its use for specific polymers like lyocell, and how post-spinning drawing and heating processes can further improve fiber properties. Factors that influence fiber morphology and properties through this process are also summarized.
This document presents information about nylon 6,6 polymer. It discusses the history of nylon 6,6's development beginning in 1927. It then describes the synthesis of nylon 6,6 which involves a step-growth polymerization of hexamethylene diamine and adipic acid. The document outlines the physical and chemical properties of nylon 6,6 including its elasticity, stiffness, melting point, and resistance to chemicals. Common applications of nylon 6,6 are mentioned such as uses in pipes, machine parts, carpets, and tires due to its strength, rigidity, and stability at high temperatures. Finally, advantages like heat and chemical resistance and disadvantages such as water absorption are highlighted.
The document discusses crystallization and crystallinity of polymers. It defines crystallinity as the degree of structural order in a solid, where the atoms or molecules are arranged in a regular, periodic manner. Crystalline polymers have long-range order arrangement of some segments of polymer chains, while amorphous polymers do not have any degree of crystallinity. Crystallinity depends on factors like length and branching of polymer chains. Methods to evaluate crystallinity include differential scanning calorimetry, X-ray diffraction, infrared spectroscopy, and nuclear magnetic resonance. Crystallinity affects important physical properties of polymers.
Elastomeric fibers are fibers that can stretch to very high elongations (400-800%) and rapidly recover their original length. They include fibers made from natural and synthetic rubbers as well as spandex and polyacrylates. Elastomeric fibers are produced via a spinning process where polymers are mixed and reacted to form long chains, then extruded through spinnerets into a water bath or air to solidify. The fibers have excellent elasticity and strength even at high elongations. Common applications include clothing, automotive and industrial parts, coatings and more where elasticity is required.
This document summarizes information about glass fiber, including its history, manufacturing process, properties, applications, and end products. Glass fiber is made of extremely fine glass fibers and is produced through a process of heating and drawing glass into fibers. It has good strength, durability, and electrical resistivity. Major applications of glass fiber include composites for transportation, electronics, construction, infrastructure, aerospace, and medical products. Glass fiber has comparable mechanical properties to carbon fiber but is cheaper and less brittle. It has a bright future due to its unique physical properties.
The document discusses different types of spinning processes used to create polymer fibers. It describes melt spinning, dry spinning, and wet spinning. In melt spinning, polymers are melted and extruded through a spinneret, then cooled. Dry spinning uses a volatile solvent and evaporates it using hot air. Wet spinning uses a non-volatile solvent and extrudes the solution into a coagulation bath to solidify the fibers. The document provides details of the processes, examples of polymers used for each type, and their advantages and disadvantages.
This document discusses the production of polyester fiber through various fiber production processes. It begins by defining polyester as a long-chain polymer composed of at least 85% ester units formed from the reaction of alcohols and acids. The key raw materials used are terephthalic acid, ethylene glycol, and dimethyl terephthalate. Polyester fiber can be produced through two main routes - the dimethyl terephthalate route and the terephthalic acid route. The document provides detailed information on the chemical reactions, catalysts, side reactions, degradation processes, and thermal stabilizers used in each production route.
Polyester fibers are long chain synthetic polymers composed of at least 85% ester units, most commonly polyethylene terephthalate (PET). PET is produced via the reaction of terephthalic acid and ethylene glycol. Other types of polyesters include poly-1,4-cyclohexylene dimethylene terephthalate and Vyron. Polyester fibers are strong, resistant to moisture and chemicals, thermally stable, and are widely used in clothing, home furnishings, and industrial applications like tire cord and conveyor belts due to their low cost, durability, and easy care properties.
The document discusses various polymer processing techniques. It begins by explaining that the main goal of polymer processing is to produce usable objects and lists the necessary parameters for processing including flow, heat transfer, mass transfer, and chemical reactions. It then focuses on extrusion, describing it as shaping material by forcing it through a die. Various extrusion techniques are discussed including single screw extrusion, twin screw extrusion, blown film extrusion, co-extrusion, and injection molding. Other processing methods summarized include thermoforming, vacuum forming, rotational molding, calendering, and spinning.
The document discusses nylon 6 fiber, including its production from caprolactam. Caprolactam is produced from cyclohexanone through several chemical reactions. Nylon 6 is synthesized through ring-opening polymerization of caprolactam. The polymerization occurs at high temperatures and results in a semi-crystalline structure. Nylon 6 fibers are produced through melt spinning and have properties derived from hydrogen bonding between amide groups and van der Waals forces between flexible chains.
Acetate fiber is a manufactured fiber made from cellulose acetate. The fiber is produced by reacting purified cellulose with acetic acid and acetic anhydride in the presence of sulfuric acid. This process acetylates the hydroxyl groups on the cellulose. Acetate fiber dissolves in acetone and is extruded through spinnerets, then the solvent is evaporated leaving fine filaments. Acetate fiber has properties including luster, durability, softness, and resistance to moths and mildew. Major uses of acetate fiber include clothing, filters, ribbons, and playing cards.
This document provides information on Nylon 6 and Nylon 66, including their preparation, manufacturing, structure-property relationships, applications, and composites. Nylon 6 is prepared from epsilon-caprolactam and water, while Nylon 66 is prepared from hexamethylene diamine and adipic acid. Both are manufactured using continuous polymerization processes. Their properties, such as strength and melting point, are influenced by factors like the distance between functional groups and molecular weight. Common applications include business equipment, consumer products, electrical/machinery parts, and automotive components. Composites with fibers or fillers can enhance properties for specific applications.
Effect of polymer structural factors on the mechanical propertiesVishal K P
This document discusses how various structural factors affect the mechanical properties of polymers. It examines the effects of molecular weight, cross-linking, crystallinity, polarity, copolymerization, and steric factors. Higher molecular weight, cross-linking density, crystallinity, and polarity generally increase the glass transition temperature and modulus. Crystallinity has a more pronounced effect above the glass transition temperature. Copolymerization can result in properties between the homopolymers or phase separation depending on the type of copolymer. Long flexible side chains decrease properties while branched side chains increase them.
This document discusses polymers used in textile industries. It defines polymers as large molecules composed of repeating monomer units, and describes the two main types of polymerization as addition and condensation. Common synthetic polymers used in textiles include nylon, polyester, and acrylic. Nylon is produced via condensation polymerization and is strong, heat resistant and abrasion resistant. Polyester is most commonly polyethylene terephthalate produced via polycondensation of a diol and diacid. Both synthetic and natural polymers like gums are used, but synthetic polymers like nylon and polyester are widely used in textile industries.
A calender is a machine that processes polymer melts into sheets or films using heat and pressure between rollers. It works by softening the polymer and passing it through nips between two or more rollers to form a continuous sheet, with the thickness determined by the gap between the last rollers. Common uses of calendered sheets include flooring, rainwear, wall coverings, and signage. Thermoplastics are well-suited for calendering as they can soften without fully melting. Different roller configurations like I, L, and Z types address issues like separating forces between rollers. Calendering is advantageous for heat-sensitive materials but high capital costs and achieving precise thickness can be challenges
Essential requirements of fiber forming polymersBademaw Abate
Matter is composed of atoms linked together by bonds of varying strength. The physical properties of the materials are determined by the arrangement of these atoms and the strength of the bonds between these atoms. An essential requirement in fiber structure is some means of ensuring continuity and strength along the length of the fiber.
High performance fibers are fibers that provide higher strength and functionality compared to commodity fibers like nylon and polyester. They have unique properties such as high tensile strength, heat resistance, and chemical resistance that make them suitable for demanding applications. Examples of high performance fibers include aramid fibers like Kevlar and Nomex, which have very high tensile strength and heat resistance. These fibers are made through solution polymerization or interfacial polymerization of monomers like paraphenylene diamine and terephthaloyl chloride. The resulting polymers have aromatic rings in their backbone, providing properties like strength, stiffness, and thermal and chemical resistance.
Spinning process
What is gel spinning
Gel spinning process
what are the factors affecting gel spinning
Gel spinning process polyethylene
Structure and Properties of Gel spun fiber
Applications
1) The document discusses various types of high performance fibers including aramid fibers like Kevlar and Nomex, PBO fibers, carbon fibers, UHMWPE fibers, and glass and ceramic fibers.
2) It provides details on the production process of Kevlar fibers and other aramid fibers which are synthesized from aromatic polyamides and spun using dry-jet wet spinning.
3) The gel spinning process used to produce UHMWPE fibers is described, which involves dissolving UHMWPE in solvent and preventing entanglement of polymer chains to achieve high strength and modulus fibers.
The document is a presentation on textiles and man-made fibers from Southeast University in Bangladesh. It includes sections on textile fibers and their classification, properties of man-made fibers and how their chemical structure influences these properties. It also discusses various spinning processes like melt, dry, and wet spinning and manufacturing processes for specific fibers like viscose and cuprammonium rayon.
This document presents on dry-jet wet spinning. It discusses that dry-jet wet spinning is a modification of wet spinning where the spinning solution is extruded into air and drawn before being submerged in a coagulation bath. This allows benefits of both dry and wet spinning processes. Key aspects of dry-jet wet spinning covered include the extrusion through an air gap, its use for specific polymers like lyocell, and how post-spinning drawing and heating processes can further improve fiber properties. Factors that influence fiber morphology and properties through this process are also summarized.
This document presents information about nylon 6,6 polymer. It discusses the history of nylon 6,6's development beginning in 1927. It then describes the synthesis of nylon 6,6 which involves a step-growth polymerization of hexamethylene diamine and adipic acid. The document outlines the physical and chemical properties of nylon 6,6 including its elasticity, stiffness, melting point, and resistance to chemicals. Common applications of nylon 6,6 are mentioned such as uses in pipes, machine parts, carpets, and tires due to its strength, rigidity, and stability at high temperatures. Finally, advantages like heat and chemical resistance and disadvantages such as water absorption are highlighted.
The document discusses crystallization and crystallinity of polymers. It defines crystallinity as the degree of structural order in a solid, where the atoms or molecules are arranged in a regular, periodic manner. Crystalline polymers have long-range order arrangement of some segments of polymer chains, while amorphous polymers do not have any degree of crystallinity. Crystallinity depends on factors like length and branching of polymer chains. Methods to evaluate crystallinity include differential scanning calorimetry, X-ray diffraction, infrared spectroscopy, and nuclear magnetic resonance. Crystallinity affects important physical properties of polymers.
Elastomeric fibers are fibers that can stretch to very high elongations (400-800%) and rapidly recover their original length. They include fibers made from natural and synthetic rubbers as well as spandex and polyacrylates. Elastomeric fibers are produced via a spinning process where polymers are mixed and reacted to form long chains, then extruded through spinnerets into a water bath or air to solidify. The fibers have excellent elasticity and strength even at high elongations. Common applications include clothing, automotive and industrial parts, coatings and more where elasticity is required.
This document summarizes information about glass fiber, including its history, manufacturing process, properties, applications, and end products. Glass fiber is made of extremely fine glass fibers and is produced through a process of heating and drawing glass into fibers. It has good strength, durability, and electrical resistivity. Major applications of glass fiber include composites for transportation, electronics, construction, infrastructure, aerospace, and medical products. Glass fiber has comparable mechanical properties to carbon fiber but is cheaper and less brittle. It has a bright future due to its unique physical properties.
The document discusses different types of spinning processes used to create polymer fibers. It describes melt spinning, dry spinning, and wet spinning. In melt spinning, polymers are melted and extruded through a spinneret, then cooled. Dry spinning uses a volatile solvent and evaporates it using hot air. Wet spinning uses a non-volatile solvent and extrudes the solution into a coagulation bath to solidify the fibers. The document provides details of the processes, examples of polymers used for each type, and their advantages and disadvantages.
This document discusses the production of polyester fiber through various fiber production processes. It begins by defining polyester as a long-chain polymer composed of at least 85% ester units formed from the reaction of alcohols and acids. The key raw materials used are terephthalic acid, ethylene glycol, and dimethyl terephthalate. Polyester fiber can be produced through two main routes - the dimethyl terephthalate route and the terephthalic acid route. The document provides detailed information on the chemical reactions, catalysts, side reactions, degradation processes, and thermal stabilizers used in each production route.
Polyester fibers are long chain synthetic polymers composed of at least 85% ester units, most commonly polyethylene terephthalate (PET). PET is produced via the reaction of terephthalic acid and ethylene glycol. Other types of polyesters include poly-1,4-cyclohexylene dimethylene terephthalate and Vyron. Polyester fibers are strong, resistant to moisture and chemicals, thermally stable, and are widely used in clothing, home furnishings, and industrial applications like tire cord and conveyor belts due to their low cost, durability, and easy care properties.
The document discusses various polymer processing techniques. It begins by explaining that the main goal of polymer processing is to produce usable objects and lists the necessary parameters for processing including flow, heat transfer, mass transfer, and chemical reactions. It then focuses on extrusion, describing it as shaping material by forcing it through a die. Various extrusion techniques are discussed including single screw extrusion, twin screw extrusion, blown film extrusion, co-extrusion, and injection molding. Other processing methods summarized include thermoforming, vacuum forming, rotational molding, calendering, and spinning.
The document discusses nylon 6 fiber, including its production from caprolactam. Caprolactam is produced from cyclohexanone through several chemical reactions. Nylon 6 is synthesized through ring-opening polymerization of caprolactam. The polymerization occurs at high temperatures and results in a semi-crystalline structure. Nylon 6 fibers are produced through melt spinning and have properties derived from hydrogen bonding between amide groups and van der Waals forces between flexible chains.
Acetate fiber is a manufactured fiber made from cellulose acetate. The fiber is produced by reacting purified cellulose with acetic acid and acetic anhydride in the presence of sulfuric acid. This process acetylates the hydroxyl groups on the cellulose. Acetate fiber dissolves in acetone and is extruded through spinnerets, then the solvent is evaporated leaving fine filaments. Acetate fiber has properties including luster, durability, softness, and resistance to moths and mildew. Major uses of acetate fiber include clothing, filters, ribbons, and playing cards.
This document provides information on Nylon 6 and Nylon 66, including their preparation, manufacturing, structure-property relationships, applications, and composites. Nylon 6 is prepared from epsilon-caprolactam and water, while Nylon 66 is prepared from hexamethylene diamine and adipic acid. Both are manufactured using continuous polymerization processes. Their properties, such as strength and melting point, are influenced by factors like the distance between functional groups and molecular weight. Common applications include business equipment, consumer products, electrical/machinery parts, and automotive components. Composites with fibers or fillers can enhance properties for specific applications.
Effect of polymer structural factors on the mechanical propertiesVishal K P
This document discusses how various structural factors affect the mechanical properties of polymers. It examines the effects of molecular weight, cross-linking, crystallinity, polarity, copolymerization, and steric factors. Higher molecular weight, cross-linking density, crystallinity, and polarity generally increase the glass transition temperature and modulus. Crystallinity has a more pronounced effect above the glass transition temperature. Copolymerization can result in properties between the homopolymers or phase separation depending on the type of copolymer. Long flexible side chains decrease properties while branched side chains increase them.
This document discusses polymers used in textile industries. It defines polymers as large molecules composed of repeating monomer units, and describes the two main types of polymerization as addition and condensation. Common synthetic polymers used in textiles include nylon, polyester, and acrylic. Nylon is produced via condensation polymerization and is strong, heat resistant and abrasion resistant. Polyester is most commonly polyethylene terephthalate produced via polycondensation of a diol and diacid. Both synthetic and natural polymers like gums are used, but synthetic polymers like nylon and polyester are widely used in textile industries.
A calender is a machine that processes polymer melts into sheets or films using heat and pressure between rollers. It works by softening the polymer and passing it through nips between two or more rollers to form a continuous sheet, with the thickness determined by the gap between the last rollers. Common uses of calendered sheets include flooring, rainwear, wall coverings, and signage. Thermoplastics are well-suited for calendering as they can soften without fully melting. Different roller configurations like I, L, and Z types address issues like separating forces between rollers. Calendering is advantageous for heat-sensitive materials but high capital costs and achieving precise thickness can be challenges
Essential requirements of fiber forming polymersBademaw Abate
Matter is composed of atoms linked together by bonds of varying strength. The physical properties of the materials are determined by the arrangement of these atoms and the strength of the bonds between these atoms. An essential requirement in fiber structure is some means of ensuring continuity and strength along the length of the fiber.
High performance fibers are fibers that provide higher strength and functionality compared to commodity fibers like nylon and polyester. They have unique properties such as high tensile strength, heat resistance, and chemical resistance that make them suitable for demanding applications. Examples of high performance fibers include aramid fibers like Kevlar and Nomex, which have very high tensile strength and heat resistance. These fibers are made through solution polymerization or interfacial polymerization of monomers like paraphenylene diamine and terephthaloyl chloride. The resulting polymers have aromatic rings in their backbone, providing properties like strength, stiffness, and thermal and chemical resistance.
Spinning process
What is gel spinning
Gel spinning process
what are the factors affecting gel spinning
Gel spinning process polyethylene
Structure and Properties of Gel spun fiber
Applications
1) The document discusses various types of high performance fibers including aramid fibers like Kevlar and Nomex, PBO fibers, carbon fibers, UHMWPE fibers, and glass and ceramic fibers.
2) It provides details on the production process of Kevlar fibers and other aramid fibers which are synthesized from aromatic polyamides and spun using dry-jet wet spinning.
3) The gel spinning process used to produce UHMWPE fibers is described, which involves dissolving UHMWPE in solvent and preventing entanglement of polymer chains to achieve high strength and modulus fibers.
The document is a presentation on textiles and man-made fibers from Southeast University in Bangladesh. It includes sections on textile fibers and their classification, properties of man-made fibers and how their chemical structure influences these properties. It also discusses various spinning processes like melt, dry, and wet spinning and manufacturing processes for specific fibers like viscose and cuprammonium rayon.
This document discusses man-made fibers, including their classification and production processes. It begins by listing reference books on textile fibers. It then defines textile fibers and their key properties. There are two main types of man-made fibers: regenerated fibers made from cellulose, such as viscose, and synthetic fibers produced through chemical reactions, like polyester and nylon. These fibers are made using processes like melt spinning, dry spinning, and wet spinning. The document discusses the advantages and disadvantages of man-made fibers compared to natural fibers, as well as various fiber properties and texturing methods.
Chemical spinning is the process of converting a fiber-forming substance into a viscous fluid that is extruded through spinneret holes and then solidified. The most widely used chemical spinning method is melt spinning, which is used for polymers that can be melted safely. A spinneret must have corrosion-resistant holes of controlled dimensions to produce uniform fibers and withstand high pressures. Melt spinning is the fastest chemical spinning method. Dry spinning fibers often have deformed cross-sectional shapes due to uneven solidification from the exterior to interior layers. Solvent recovery is essential for dry spinning to minimize environmental and economic costs. Wet spinning poses the highest pollution risks of the three methods discussed.
Textile manufacturing and fabric processing (fiber to fabric)damayantimeher
This presentation deals with basic of fiber to fabric manufacturing process i.e spinning weaving , dyeing and printing.Spinning portion cover both natural fiber spinning, details of weaving and wet chemical processing portion cover dyeing printing and finishing of fibre yarn and fabric
The document discusses different types of fibres including natural, synthetic and man-made fibres. It provides details about various natural fibres such as cotton, linen and wool obtained from plants and animals. Synthetic fibres discussed include nylon and polyester which are manufactured by polymerization of monomers through processes like spinning and drawing. Nylon-6,6 is synthesized from hexamethylenediamine and adipic acid while polyester is formed by the reaction of alcohol and carboxylic acid. Both fibres find a variety of applications. The document also highlights some issues with silk and artificial muscle production processes.
For decades, different types of fibers have provided numerous unique solutions in filtration applications. In filtration / filter aid applications fiber provides a protective layer to valuable equipments promoting improved throughput and clarity.
This document summarizes man-made fiber spinning technology. There are three main types of spinning - melt, dry, and wet spinning. Melt spinning involves melting the polymer and extruding it through spinnerets. Dry spinning uses a volatile solvent to dissolve the polymer before extrusion. Wet spinning extrudes the polymer solution into a coagulating bath. Each method has advantages and disadvantages related to investment cost, hazard level, heat requirement, and production speed. The document also discusses properties required for fiber-forming polymers and the basic spinning system components like spinnerets.
Fibre, Nylon & Polyester
The document discusses different types of fibres including natural, synthetic and regenerated fibres. It provides details on various natural fibres like cotton, linen and wool obtained from plants and animals. Synthetic fibres discussed include nylon and polyester which are manufactured by polymerization of monomers. The manufacturing process involves polymerization, spinning and drawing. Properties and uses of nylon and polyester are also highlighted. Issues with silk production and potential uses of artificial muscles created from common materials like fishing line are summarized.
Man made fiber spinnning technology and commonly used man made fiber producti...Bademaw Abate
This document provides an overview of man-made fiber formation and regenerated fibers. It discusses the basic principles of fiber manufacturing including converting the fiber-forming substance into a fluid and extruding it through spinnerets. Melt spinning and solution spinning methods are described. Regenerated fibers like viscose rayon and cellulose acetate are discussed, including their manufacturing processes. Properties and uses of various fibers like polyester, nylon 6, and nylon 6,6 are also summarized.
Polymeric and Hybrid Composite Materials for Aircraft Engine applications / ...Padmanabhan Krishnan
Contents: Introduction to Engines used in Aircrafts,
Materials and Manufacturing,
Basic Mechanics,
Meso and Macro mechanics and Interfaces in Composites,
Tests and failure theories,
Possibilities in Product Design and Development,
Possibilities in Aircraft Engine Applications
Man made fiber formation and regenerated fibersBademaw Abate
This document provides an overview of man-made fiber formation and regenerated fibers. It discusses the basic principles of fiber manufacturing, including converting the fiber-forming substance into a fluid and extruding it through spinnerets. Melt spinning and solution spinning methods are described. Regenerated fibers like viscose rayon and cellulose acetate are examined, outlining their production processes and key properties. Viscose rayon is made through wet spinning cellulose into a viscose solution, while acetate is produced via dry spinning after acetylating cellulose. Their uses include clothing, home goods, and industrial applications.
The document discusses specialty polymeric products, focusing on polymeric fibers and films. It provides details on:
- The manufacture and types of polymeric fibers, including characterization methods. Fibers include rayon, acetate, olefinics, acrylics, and polyamides.
- The processes for forming monofilaments and fabrics from fibers, including wet spinning, dry spinning, and melt spinning.
- The various types and applications of polymeric films, including food packaging, mechanical packaging, and other uses. Film materials include cellulose, LDPE, HDPE, PP, PVC, and PET.
There are several types of spinning processes used to create polymer fibers, including melt spinning, wet spinning, dry spinning, and electrospinning. Melt spinning involves melting a polymer and extruding it through a spinneret to form fibers, which are then drawn into yarns. Wet spinning uses a polymer dissolved in solvent and extruded into a coagulation bath to form fibers. Dry spinning also uses a polymer solution but evaporates the solvent to solidify the fibers. Electrospinning uses an electric charge to draw fibers from polymer solutions or melts into very thin fibers only a few hundred nanometers in diameter.
Kevlar is a high-performance synthetic fiber made from para-aramid polymers. It is exceptionally strong for its weight, with high tensile strength and modulus. Kevlar fibers are produced through a solution spinning process using concentrated sulfuric acid and result in highly oriented molecular chains arranged in liquid crystalline domains. The fiber has high strength, stiffness, and heat resistance and is used in applications like bulletproof vests, composites, ropes, and tires due to its unique properties. Aramid fibers like Kevlar and Twaron are resistant to chemicals but can be degraded by strong acids and bases.
Man made fibre presentation from basic to higher levelhimadrik3132
This document provides an overview of a course on man-made fibers taught by Dr. Mukesh Bajya. The course aims to develop an understanding of man-made fiber manufacturing processes and properties. Key topics covered include the history of man-made fibers, fiber formation methods like melt spinning and solution spinning, drawing and heat setting, common man-made fibers like polyester, nylon and acrylic, structure-property relationships, and new developments in the field. The course involves 40 total lectures across various fiber production topics.
Synthetic fibers are man-made polymers created by linking small chemical units called monomers into long chains called polymers. Common synthetic fibers include nylon, polyester, acrylic, acetate, spandex, aramid, and olefin. They are produced through processes like melt spinning, wet spinning, and dry spinning. Synthetic fibers have properties like high chemical resistance, strength, and availability but are flammable and do not absorb moisture well. They are widely used to make clothing, home textiles, and industrial materials due to their low cost and unique properties compared to natural fibers.
This document discusses the fundamentals of textiles and classification of fibers. It covers natural, regenerated, and synthetic man-made fibers. The key fiber production processes of melt, dry, and wet spinning are compared. Melt spinning involves melting the polymer and extruding filaments. Dry spinning uses solvent evaporation. Wet spinning hardens the filaments through chemical coagulation in a bath. Viscose rayon and lyocell manufacturing processes are also outlined.
This document provides information on Millipore's ultrafiltration membrane products for macromolecule processing. It describes four product lines - Biomax PB, Ultracel PLC, Ultracel PL, and Viresolve membranes. For each product line, it lists the key features and applications. It also includes specifications sheets that provide further details on each individual membrane type, such as molecular weight cutoff range, material composition, flux rates and dimensions. The document is intended to help users select the appropriate ultrafiltration membrane for their specific application.
Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...IJECEIAES
Medical image analysis has witnessed significant advancements with deep learning techniques. In the domain of brain tumor segmentation, the ability to
precisely delineate tumor boundaries from magnetic resonance imaging (MRI)
scans holds profound implications for diagnosis. This study presents an ensemble convolutional neural network (CNN) with transfer learning, integrating
the state-of-the-art Deeplabv3+ architecture with the ResNet18 backbone. The
model is rigorously trained and evaluated, exhibiting remarkable performance
metrics, including an impressive global accuracy of 99.286%, a high-class accuracy of 82.191%, a mean intersection over union (IoU) of 79.900%, a weighted
IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
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4. Product Shaping / Secondary
Operations
EXTRUSION
Shaping
through die
Final Product (pipe, profile)
Secondary operation
Fiber spinning (fibers)
Cast film (overhead
transparencies,
Blown film (grocery bags)
Preform for other molding
processes
Blow molding (bottles),
Thermoforming (appliance
liners)
Compression molding
(seals)
5. Fibers
• A Fiber is a long, thin thing!
– Aspect ratio >100
– At diameters > 75 m, the fiber is a rod
• Long means:
– > 1 kilometer
• At a density of 1.4 and a denier of 5, 1 kilometer weighs less than 5 grams
– > 1 kilogram
• 1.5 kilograms at 5 dpf is 20,000 miles
• Few commercial fibers are produced at a scale of less than 500 tons
– The length at 5 dpf is ~ .01 lightyear
• Typical melt spinning speeds are in excess of 100 miles/hour
– To be viable, polymer to fiber conversions must be ~ 90%
• Minimum property CVs are < 10%
• Real fibers are hard to make!!
6. MACROSCALE vs MICROSCALE
Griffith’s experiments
with glass fibers (1921)
Strength of bulk
glass: 170 MPa
Extrapolates to
11 GPa
FIBER DIAMETER (micron)
3
2
1
TENSILE STRENGTH (GPa)
0
0 20 40 60 80 100 120
7. Griffith’s equation for the strength of materials
2
s g a = length of defect
1 2
E
p
ö çè
÷ø
= æ
a
g = surface energy
• Thus, going from the macroscale to the atomic scale (via the
nanoscale), defects progressively become smaller and/or are
eliminated, which is why the strength increases (see equation).
• Note that the Griffith model predicts that defects have no
effect on the modulus, only on strength
• But note: the model also predicts that defects of zero length
lead to infinitely strong materials, an obvious impossibility!
8. Fibers
1000 X longer than diameter
Often uniaxial strength
Kevlar-strongest organic fiber
• M elt spinning technology can be applied to polyamide (Nylon),
polyesters, polyurethanes and polyolefins such as PP and HDPE.
• The drawing and cooling processes determine the morphology and
mechanical properties of the final fiber. For example ultra high
molecular weight HDPE fibers with high degrees of orientation in the
axial direction have extremely high stiffness !!
• Of major concern during fiber spinning are the instabilities that arise
during drawing, such as brittle fracture and draw resonance. Draw
resonance manifests itself as periodic fluctuations that result in
diameter oscillation.
9. TABLE 4.2. Fiber Propertiesa
Fiber Type
Natural
Cotton
Wool
Synthetic
Polyester
Nylon
Aromatic polyamide
(aramid)c
Polybenzimidazole
Polypropylene
Polyethylene (high strength)
Inorganicc
Glass
Steel
Tenacityb
(N/tex)
0.26-0.44
0.09-0.15
0.35-0.53
0.40-0.71
1.80-2.0
0.27
0.44-0.79
2.65d
0.53-0.66
0.31
Specific
Gravity
1.50
1.30
1.38
1.14
1.44
1.43
0.90
0.95
2.56
7.7
aUnless otherwise noted, data taken form L. Rebenfeld, in Encyclopedia of Polymer Science and Engineering (H. f. Mark,
N. M. Bikales, C. G. Overberger, G. Menges, and J. I. Kroschwitz, Eds.), Vol. 6, Wiley-Interscience, New York, 1986,
pp. 647-733.
bTo convert newtons per tex to grams per denier, multiply by 11.3.
cKevlar (see Chap. 3, structure 58.)
dFrom Chem. Eng. New, 63(8), 7 (1985).
eFrom V. L. Erlich, in Encyclopedia of Polymer Science and Technology (H.F. Mark, N. G. Gaylord, and N. M. Bikales,
Eds.), Vol. 9, Wiley-Interscience, New Uork, 1968, p. 422.
10. Polymer fibers
Organic
polymers
Flexible
molecules
Stiff
molecules
Melt
spinning
Wet
spinning
Dy
spinning Cellulose
Melt
spinning
Wet
spinning
Normal
spinning
Super
stretching
Nylon
PP, PE
HMW
PE
UHMW
PE
Acetate
Aromatic
polyesters
Aramides
11. Fibers
Dry Spinning:
From solution
Melt Spinning:
From Melt
Cellulose Acetate Nylon 6,6 & PETE
Wet Spinning:
From solution into
solution
Kevlar, rayon, acrylics,
Aramids, spandex
12. Fiber Spinning: Melt
Fiber spinning is used to
manufacture synthetic fibers.
A filament is continuously
extruded through an orifice
and stretched to diameters
of 100 mm and smaller. The
molten polymer is first
extruded through a filter or
“screen pack”, to eliminate
small contaminants. It is
then extruded through a
“spinneret”, a die composed
of multiple orifices (it can
have 1-10,000 holes). The
fibers are then drawn to their
final diameter, solidified (in a
water bath or by forced
convection) and wound-up.
Heating Grid
Po
ol
Moisture
Conditioning
Steam
Chamber
Bobbin
Melting
Zone
Metered
Extrusio
n (controll
ed flow)
Extruded Fiber
Cools
and Solidifies Here
Polymer
Chips/Beads
Pump
Filter and
Spinneret
Air
Diffuser
Lubricati
on by oil
disk and
trough
Packagi
ng
Bobbin drive
Yarn
driver
Feed
rolls
Nylon 6,6 & PETE
13. Feed
Filtered
polymer
solution
Metered
extrusion Pump
Filter and
spinneret
Solidification
by solvent
evaporation
Heated
chamber
Lubrication
Air
inlet
Feed roll
and guide
Yarn driving
Balloon guide
Packaging
Ring and traveler
Bobbin transverse
Spindle
Dry Spinning
Dry Spinning of Fibers
from a Solution
Cellulose Acetate
17. Acrylic Fibers
• 85% acrylonitrile
• Wet spun
• Acrylic's benefits are:
– ・Superior moisture management or wickability ・
– Quick drying time (75% faster than cotton) ・
– Easy care, shape retention ・
– Excellent light fastness, sun light resistance ・
– Takes color easily, bright vibrant colors ・
– Odor and mildew resistant
18.
19. • Nanotube effecting crystallization of PP
• Sandler et al, J MacroMol Science B, B42(3&4), pp 479-
488,2003
20. Why are strong fibers strong?
The source of strength: van der Waals forces
Flexible molecules,
normally spun
Flexible molecules
ultra stretched
Rigid molecules
liquid crystallinity
21. N
N
O
O
H
H
N
N
O
O
H
H
N
N
O
O
H
H
Kevlar
Fiber orientation
•High Tensile Strength at Low Weight
•Low Elongation to Break High Modulus (Structural Rigidity)
•Low Electrical Conductivity
•High Chemical Resistance
•Low Thermal Shrinkage
•High Toughness (Work-To-Break)
•Excellent Dimensional Stability
•High Cut Resistance
•Flame Resistant, Self-Extinguishing
22. Kevlar or Twaron
•High Tensile Strength at Low Weight
•Low Elongation to Break High Modulus (Structural Rigidity)
•Low Electrical Conductivity
•High Chemical Resistance
•Low Thermal Shrinkage
•High Toughness (Work-To-Break)
•Excellent Dimensional Stability
•High Cut Resistance
•Flame Resistant, Self-Extinguishing
25. Aramide fibers
the complete spinning line H2SO4
80 wt%
PPD-T
20 wt%
H2O
ice
machine
H2SO4 ice
mixer
extruder
spinneret
Washing
csulf.ac. < 0.5 %
neutralising
drying
2000C
winding
H2SO4 + H2O
air gap
Long washing traject
(initially difficult to control)
Sometimes post-strech of 1%
to enhance orientation
26. Strong fibers from flexible chains
Super-stretched polyethylene:
Mw = 105 (just spinnable)
conventional melt spinning
additional stretching of 30 to 50 times
below the melting point
Wet (gel) spinning of polyethylene
Mw = 106 (to high elasticity for melt spinning)
decalin or parafin as solvent
formation of thick (weak) fibers without stretching
removal of the solvent
stretching of 50 to 100 times close to melting point
27. POLYETHYLENE (LDPE)
H2C CH2
R
H2C CH2
20-40,000 psi x
150-325°C
Molecular Weights: 20,000-100,000; MWD = 3-20
density = 0.91-0.93 g/cm3
Highly branched structure
—both long and short chain
branches
Tm ~ 105 C, X’linity ~ 40%
H3C
C
H2
15-30 Methyl groups/1000 C atoms
CH3
Applications: Packaging Film, wire and cable coating, toys,
flexible bottles, housewares, coatings
CH3
H3C
CH3
H3C
H3C
H3C
H3C
28. Polyethylene (HDPE)
CH3
Essentially linear
structure
Few long chain branches, 0.5-3
methyl groups/ 1000 C atoms
Molecular Weights: 50,000-250,000 for molding
compounds
250,000-1,500,000 for pipe compounds
>1,500,000 super abrasion resistance—medical implants
MWD = 3-20
dTemn s~it y1 3=3 -01.9348- C0.,9 X6 ’gli/ncmity3 ~ 80%
Generally opaque
Applications: Bottles, drums, pipe, conduit, sheet, film
29. UHMWPE fibers: Dyneema or
Spectra
Gel spinning process
Structure of UHMWPE,
with n = 100,000-250,000
http://www.dyneema.com
31. Aramide fibers
the spinning mechanism
polymer in
pure sulfuric acid
at 850C
platinum
capillary 65m
air gap 10 mm with
elongational stretch (6x)
coagulation
bath at 100C
removal of
sulfuric acid
Specific points:
solvent: pure H2SO4
polymer concentration 20%
general orientation
in the capillary
extra orientation in
the air gap
coagulation in cooled
diluted sulfuric acid
32. O
O
O
O
m
n
Vectran
Vectran fiber is thermotropic, it is melt-spun, and it flows at a high temperature under pressure
33.
34.
35. O
O
HN NH HN
n
Aramid
n
Ultra High Molecular Weight Polyethylene
O
O
O
O
m
n
Vectran
O
N
N
O
n
poly(p-phenylene benzobisoxazole)
Zylon
36.
37.
38.
39. Carbon Fibers: Pyrolyzing
Polyacrylonitrile Fibers
N N N N N N N N
Young’s Modulus 325 Gpa
Tensile Strength 3-6 GPa
N N N N N N N N
C C C C C C C
N N N N N N N
40.
41. Electrospinning of Fibers
5-30 kV
–Driving force is charge dissipation, opposed by surface tension
–Forces are low
–Level of charge density is limited by breakdown voltage – Taylor cone
formation
Fiber diameter a [Voltage]-1
–“Inexpensive” and easy to form nanofibers from a solution of practically any
polymer (Formhals 1934)
–Only small amount of material required
51. Fig. 4. Scanning electron micrograph of a dry ribbon deposited on a
glass substrate. The black arrow indicates the main axis of the
ribbons, which corresponds to the direction of the initial fluid velocity.
Despite the presence of a significant amount of carbon spherical
impurities, SWNTs bundles are preferentially oriented along the main
axis. Scale BAR=667 nm
54. Polymides (PI) - Vespel®, Aurum®, P84®, and more.
Polybenzimidazole (PBI) - Celazole®
Polyamide-imide (PAI) - Torlon®
Polyetheretherketone (PEEK) - Victrex®, Kadel®, and more.
Polytetrafluoroethylene (PTFE) - Teflon®, Hostaflon®
Polyphenylene Sulfide (PPS) - Ryton®, Fortron®, Thermocomp®, Supec®
and more.
Polyetherimide (PEI) - Ultem®
Polypthalamide (PPA) - Amodel®, BGU®, and more.
Aromatic Polyamides - Reny®, Zytel HTN®, Stanyl®
Liquid Crystal Polymer (LCP) - Xydar®, Vectra®, Zenite®, and more.
Other Polymers - Nylon, Polyacetal, Polycarbonate, Polypropylene, Ultra
High Molecular Weight Polyethylene, ABS, PBT, and mor
Editor's Notes
Dyneema(r), the worldユs strongest fiberDSM Dyneema is the inventor and manufacturer of Dyneemaィ, the world&apos;s strongest fiber. Dyneemaィ is a superstrong polyethylene fiber that offers maximum strength combined with minimum weight. It is up to 15 times stronger than quality steel and up to 40% stronger than aramid fibers, both on weight for weight basis. Dyneemaィ floats on water and is extremely durable and resistant to moisture, UV light and chemicals. The applications are therefore more or less unlimited. Dyneemaィ is an important component in ropes, cables and nets in the fishing, shipping and offshore industries. Dyneemaィ is also used in safety gloves for the metalworking industry and in fine yarns for applications in sporting goods and the medical sector. In addition, Dyneemaィ is also used in bullet resistant armor and clothing for police and military personnel.