Section I : Fibers Outline

Transcription

1 Section I : Fibers Outline Introduction o Generic and trade names o Classification o Staple and filament fibers Understanding Fiber Structure and Properties Fiber Terminology o Fiber Structure Length; surface contour and shape; fineness, luster; color; crimp o Fiber Properties Tenacity and modulus; elongation and elastic recovery; resiliency; flexibility; moisture properties; resistance to chemicals; resistance to microorganisms and insect damage; resistance to sunlight; and effect of heat and flame TSC Group Inc. All rights reserved.

2 About Fibers Fiber o Fundamental unit of all textile products o Found in nature and also manufactured from various raw materials o Classified into natural and manufactured fibers

3 About Fibers Generic Names o Defined by the Federal Trade Commission o For natural fibers - based on fiber source o For manufactured fibers - based on the chemical composition o Basis for fiber classification o Required on labels (see section on regulations) Trade Names o Assigned by fiber manufacturers trade name generic name

4 Textile Fibers Natural Fibers Manufactured Fibers Cellulose Seed Hair Cotton Kapok Milkweed Bast Flax (Linen) Ramie Hemp Jute Leaf Sisal Abaca Piña Raffia Fruit Husk Coir Protein Animal Hair Wool Specialty Wool Fur Fibers Extruded Silk Spider Silk Mineral Asbestos* Regenerated Cellulose Rayon Lyocell Cellulose Derivatives Acetate Triacetate Regenerated Protein Azlon ISO names are not as FTC generic names but permitted by FTC on product labels Alginate Carbon Chlorofibre Cupro (cuprammonium included under rayon) Elastane (same as spandex) Elastodiene Fluorofibre (same as fluoropolymer) Metal Fibre (same as metallic) Modal (included under rayon) Polyamide (same as nylon) Polyethylene (included under olefin) Polyimide Polypropylene (included under olefin) Vinylal Viscose (included under rayon) Fibers commonly used for apparel and interiors are in bold * asbestos not used for health reasons ** FTC definition includes natural and synthetic rubber Synthetic Other Rubber Petroleum Rubber** Lastrile Nylon Polyester Elasterell-p Triexta (PTT) Acrylic Modacrylic Spandex Olefin Lastol Aramid Nytril Vinal Vinyon Anidex Novoloid Sulfar Elastoester PBI Melamine Fluoropolymer PLA Mineral Metallic Glass

5 Staple and Filament Fibers Fibers differentiated based on length o Staple fibers o Filament fibers staple fibers filament fibers Length determines the methods used for processing

6 Staple and Filament Fibers Staple: short fibers (ranging from <1 to a few inches) o All natural fibers (except silk) are staple fibers o Manufactured fibers can be cut into staple fibers Filament: long continuous fibers extending for great lengths (several hundred yards) o Silk is the only natural filament fiber o All manufactured fibers are produced as filament fibers

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9 Fiber Structure and Properties Fiber Structure o Appearance characteristics visible without a microscope (e.g., fiber length, color) o And with a microscope (e.g., cross-section) Fiber Properties o Physical, chemical, moisture, biological and other o Dependent on the large molecules, called polymers, from which the fibers are made

10 Fiber Structure Fixed for natural fibers; engineered for manufactured fibers Length Surface Contour and Shape Fineness Luster Color Crimp

11 Fiber Structure Terminology Fiber Length o Length of staple fibers varies by source of fiber and variety/breed o Used to determine the quality o Important for processing staple fibers into yarns Surface Contour (Longitudinal View) and Shape (Cross-section) o Used to identify natural fibers o Can be changed in manufactured fibers to influence performance

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15 Fiber Structure Terminology Fineness o Size or diameter o Used to determine the quality o Measured in manufactured fibers by weighing a known length of the continuous uniform fiber

16 Fiber Structure Terminology Luster o Sheen or shine o Depends on light reflected from the surface Color o Depends on fiber source o Most are white or off-white Crimp o Fiber s waviness o Some fibers have natural waviness o Manufactured fibers can be crimped to improve cohesiveness

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20 Fiber Properties Terminology Tenacity o Fiber s strength per unit size o Affects the strength of yarns and fabrics made from these yarns o Affects durability Modulus o Fiber s resistance to extension o High modulus is important for end uses such as seatbelts

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22 Fiber Properties Terminology Elongation o Ability to extend when pulled along length until fiber breaks (Note: The example below is to demonstrate elongation; the fiber was not stretched to breaking point.)

23 Fiber Properties Terminology Elastic Recovery o Fiber s ability to return to its original length after it has been stretched o Affects stretch and shape retention properties of fabrics as well as comfort and appearance

24 Fiber Properties Terminology Resilience o Ability to recover after compression (e.g., crushed, crumpled, twisted) o Affects wrinkle recovery and fabric loft o Important for carpets and fiber batting

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26 Fiber Properties Terminology Flexibility o Ability to bend or fold without breaking. o Affects fabric hand and drape, and resistance to edge abrasion

27 Fiber Properties Terminology Moisture Properties o Absorption Ability to take in water Hydrophilic fibers absorb moisture Hydrophobic fibers do not absorb moisture Hygroscopic fibers absorb moisture without feeling clammy or wet (e.g., wool, silk) o Adsorption Ability to hold water on its surface o Wicking Ability to transport water (or liquid) along the surface Dependent on chemical composition, fiber shape, and fiber fineness

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30 Fiber Properties Terminology Affinity for Oil o Ability to adsorb and absorb oily substances o Oleophilic fibers have an affinity for oil o Oleophobic fibers have no affinity for oil Affinity for oil affects staining and stain removal oil stain on a shirt made with oleophilic fibers

31 Fiber Properties Terminology Resistance to Chemicals o Ability to withstand contact with acids, alkalis, oxidizing agents, and organic solvents o Dependent upon: Chemical composition and fiber structure Concentration and amount of chemical Duration of chemical contact with the fiber o Dictates: Fiber processing methods Textile cleaning methods Damage in use due to contact with chemicals

32 Fiber Properties Terminology Resistance to Microorganisms o Bacteria and fungi o Cotton, rayon, and other cellulosic fibers not resistant to mildew o Manufactured fibers made of petroleum-based products have excellent resistance to microorganism damage and are not prone to rotting Resistance to Insect Damage o Protein and cellulosic fibers are a food source for insects

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36 Fiber Properties Terminology Resistance to Sunlight o Silk, nylon are not resistant o Affects fabric use for window treatments and outdoor applications

37 Fiber Properties Terminology Effect of Heat and Flame o Determined by the chemical composition and physical structure of the polymers o Thermoplastic- melts when heated, changes its shape o Used to identify fiber groups o Affects fabric processing, drying, and ironing temperatures o Used to create fabrics with special appearance