fibres classification and characteristics
TRANSCRIPT
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TTD 102 Introduction To Textile Fibres
10/6/10 1 Dr. Parul Bhatnagar
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10/6/10 2 Dr. Parul Bhatnagar
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Fibre Filament 10/6/10 3 Dr. Parul Bhatnagar
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Cotton Wool
Silk 10/6/10 4 Dr. Parul Bhatnagar
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Man-made Fibres Filaments 10/6/10 5 Dr. Parul Bhatnagar
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Introduction
Textile fibres are hair-like substances with a high
degree of fineness, outstanding flexibility, reasonable strength, a
minimum level of length and cohesiveness.
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Staple fibres Filaments 10/6/10 7 Dr. Parul Bhatnagar
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Based on their origin, the fibres may be classified as:
• Natural and • Man-made.
Classification of Fibres
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Natural fibres can be further classified according to their origin into the following three groups:
Vegetable Fibres Animal Fibres Mineral Fibres
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Vegetable Fibres
Cotton
Jute Flax
Linen
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Ramie Coir
Sisal Hemp 10/6/10 11 Dr. Parul Bhatnagar
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Animal Fibres
Wool
Silk
Protein Fibre 10/6/10 12 Dr. Parul Bhatnagar
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Mineral Fibres
Asbestos 10/6/10 13 Dr. Parul Bhatnagar
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Man-made Fibres are sometimes called artificial fibres or manufactured fibres .
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They may also be divided into the following three categories:
Derived from natural feedstock
Derived from manufactured feedstock
Miscellaneous fibres 10/6/10 15 Dr. Parul Bhatnagar
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Derived from natural feedstock
Viscose Rayon 10/6/10 16 Dr. Parul Bhatnagar
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The cellulose fibres are made directly from a solution of cellulose —these are available under the trade names Lyocell and Tencel.
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Rubber Latex 10/6/10 18 Dr. Parul Bhatnagar
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Derived from manufactured feedstock
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Polyamide Polyester
Acrylic Polypropylene 10/6/10 20 Dr. Parul Bhatnagar
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Spandex
Lycra 10/6/10 21 Dr. Parul Bhatnagar
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Miscellaneous fibres
Glass Fibre
Silver Gold 10/6/10 22 Dr. Parul Bhatnagar
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Classification of Fibres and Filaments
Wool, Silk Asbestos
TEXTILE FIBRES
Natural Man-made
Vegetable Animal Mineral
Derived from Natural Feedstock Derived from Manufactured Feedstock Miscellaneous
Viscose Rayon, Lyocel, Tencel, Polynosic, Cuprammonium Rayon, Rubber
Nylon 66, Nylon 6, Polyester, Acrylic, Spandex, Lycra, Polypropelene
Metal, Glass
Cotton, Kapok: Seed
Jute, Hemp, Ramie: Flax
Sisal, Pineapple, Banana: Leaf
Coir: Fruit
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Natural Fibres
Cotton, wool and silk are the major natural fibres.
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Cotton boll Cotton boll burst 10/6/10 25 Dr. Parul Bhatnagar
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Cotton 10/6/10 26 Dr. Parul Bhatnagar
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Wool
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Wool shearing from sheep 10/6/10 28 Dr. Parul Bhatnagar
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Silk
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Silk Worms
Cocoon
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Coccons in Solution
Collection of Filaments
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Polymeric Nature of Fibres
The polymeric nature of fibres explained a number of their properties, e.g. the ability of
the fibre to extend significantly on application of
load and its recovery on removal of the load.
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Schematic representation of the extension of a molecule on application of load
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Viscose Rayon
Polyamide 10/6/10 34 Dr. Parul Bhatnagar
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Polyester
Acrylic
Polypropylene 10/6/10 35 Dr. Parul Bhatnagar
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Nylon 66 Nylon 6
Polyester 10/6/10 36 Dr. Parul Bhatnagar
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Man-Made Fibres
They are produced by polymerizing low molecular
weight chemical substances, usually at high pressures and temperatures in the presence
of catalysts.
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Melt spinning
Polyester
Nylon
Polypropylene 10/6/10 38 Dr. Parul Bhatnagar
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Melt Spinning
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Solution spinning
• Wet spinning • Dry spinning
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Wet spinning
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As the fluid filaments are squirted out under pressure, precipitation occurs. The solid filaments are then washed, drawn in two stages, dried and wound.
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Viscose Rayon
Polyacrylonitrile Fibre
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The filament bundle falls into a drying chamber where the solvent is made to evaporate and the solidified filament are then wound. The drawing is done separately.
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Polyacrylonitrile
Viscose Rayon Spandex 10/6/10 46 Dr. Parul Bhatnagar
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Natural Fibres Vs. Man-Made Fibres
The long molecules are oriented in both cases and show the presence of both order and disorder in the
way molecules are organized.
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Schematic sketch showing how molecules aggregate in a fibre
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Natural Fibre
Man-made Fibre 10/6/10 49 Dr. Parul Bhatnagar
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Another important difference is the complex morphology (Study of forms of things) of natural fibres as opposed to the rather simpler morphology of man-made fibres.
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Natural fibres absorb a greater amount of moisture because they contain more water absorbing groups than the synthetic fibres.
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Viscose Rayon
Natural Fibre 10/6/10 52 Dr. Parul Bhatnagar