Viscose rayon is a regenerated cellulose fiber made from cellulose derived from wood or cotton. It is produced through a process involving the conversion of cellulose to a soluble compound called viscose, which is then spun through a spinneret into fibers and treated with acid. Viscose rayon is highly absorbent, soft, easy to dye, and drapes well. It is biodegradable and versatile. The manufacturing process involves treating cellulose with alkali and carbon disulfide to form sodium cellulose xanthate, which is then dissolved to create the viscose solution and spun into fibers.

1. To My
Presentation

2. VISCOSE RAYON FIBRE

3. 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 ?

4. 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.

5. Characteristics of Viscose Fibre
 Highly absorbent.
 Soft and comfortable.
 Easy to dye.
 Drapes well.
 Versatile.
 It does not shrink when heated.
 It is biodegradable.

6. 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%

7. Chemical structure

8. Spining bath composition
 H2SO4 : 10%
 Na2SO4 : 18%
 Glucose : 02%
 ZnSO4 : 01%
 Water : 69%

9. Cellulose unit for viscous ,n=350
Cellubiose unit for cuprammonium,n=450
Cellubiose for polynosic ,n=500
DP of Viscous rayon

10. 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

11. Processing
step
Reaction
Steeping C6H9O4OH + NaOH C6H9O4. Ona +H2O
Xanthation C6H9O4. Na +CS2 C6H9O4. OCSSNa + Na2CS3
Mixing C6H9O4. OCSSNa + NaOH Viscose solution
Ripening C6H9O4. OCSSNa + NaOH C6H9O4OH + CS2 + NaOH
Spinning C6H9O4. OCSSNa + H2SO4 C6H9O4OH +CS2 + Na2SO4
Sequence of reaction viscose process

12.  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

13. 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.

14. Some products of Viscose rayon fibre