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VISCOSE RAYON 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 ?

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.

Characteristics of Viscose Fibre

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

PROPERTIES OF VISCOSE FIBRE

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%

Chemical structure

Spining bath composition

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

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

DP of Viscous rayon

Manufacturing Of Viscose rayon Fibre

Raw materials , wood pulp (C6H10O5)

Alkali cellulose (C6H9O4ONa)

Cutting

Ageing

Sodium cellulose xanthate

Viscose spinning solution

Filtration and de-aeration

Ripening

Spinning and winding

Processing step

Reaction

Steeping C6H9O4OH + NaOH C6H9O4. Ona +H2O

Xanthation

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

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

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.

Some products of Viscose rayon fibre