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Page 1: Presentation - Viscose fibre

To My Presentation

Page 2: Presentation - Viscose fibre


Page 3: Presentation - Viscose fibre

Viscose is a regenerated very fine , regular filament or staple fibre .viscose rayon is made by reconverting cellulose from a soluble xanthate from to tough fibres by washing in acid.

What is viscose rayon fibre ?

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Introduction It is the oldest regenerated cellulose fibre. It is biodegradable & renewable polymer. Common sources wood pulp & cotton lint. Highly purified wood pulp consists of 90-95%

cellulose called chemical cellulose & dissolving pulp.

The process used to make viscose either continous or batch process.

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Characteristics of Viscose Fibre

Highly absorbent. Soft and comfortable. Easy to dye. Drapes well. Versatile. It does not shrink when heated. It is biodegradable.

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Dry Tenacity(GPD) : 2.5 to 3 wet tenacity(GPD) : 40 to 50% less Moisture Regain : 13 % Lusture : Light to bright Elasticity : Good Melting Point : 150% Elongation Percentage : 20-25%

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Chemical structure

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Spining bath composition

H2SO4 : 10% Na2SO4 : 18% Glucose : 02% ZnSO4 : 01% Water : 69%

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Cellulose unit for viscous ,n=350Cellubiose unit for cuprammonium,n=450Cellubiose for polynosic ,n=500

DP of Viscous rayon

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Manufacturing Of Viscose rayon Fibre

Raw materials , wood pulp (C6H10O5)

Alkali cellulose (C6H9O4ONa)



Sodium cellulose xanthate

Viscose spinning solution

Filtration and de-aeration


Spinning and winding

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Processing step


Steeping C6H9O4OH + NaOH C6H9O4. Ona +H2O


C6H9O4. Na +CS2 C6H9O4. OCSSNa + Na2CS3

Mixing C6H9O4. OCSSNa + NaOH Viscose solutionRipening C6H9O4. OCSSNa + NaOH C6H9O4OH +

CS2 + NaOHSpinning C6H9O4. OCSSNa + H2SO4 C6H9O4OH

+CS2 + Na2SO4

Sequence of reaction viscose process

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Temperature and composition of the bath. Speed of Coagulation. Length of immersion. speed of spinning. stretch imparted to the filaments.

Factor affecting the quality of viscose rayon

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USES Blends: Regular rayon and high wet modulus usually blend with many fibers like polyester,acrylic,nylon,acetate,cotton,flax,wool and ramie. With polyester , nylon and and acrylic :Rayon contributes absorbency,comfort,and softness when blended with them.With cotton:It alters appearance to create soft luster.With wool:It will decrease the cost.With flax and romie:It can help produce appearnce that are typically associated with linen like fabrics.

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Some products of Viscose rayon fibre

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