HEAT
SETTING
Heat setting,purpose of heat setting,object of heat setting,type of heat setting,parameter of heat setting
The
process of bringing the dimensional stability to synthetic fabric is known
as Heat Setting"
PURPOSE
Fabrics
of synthetic fibres and their blends have a tendency to shrink and to form
Permanent crease and Wrinkles in boiling water and in hot air.
Most
of the treatment's for polyester ate carried out only at higher temperature
above 1oo°C. However the polyester shrinks heavily therefore, it should be
controlled.
The process of bringing dimensional stabilility in synthetic fibre fabrics is known as heat setting.
The process of bringing dimensional stabilility in synthetic fibre fabrics is known as heat setting.
Most
of the treatment's for polyester ate carried out only at higher temperature
above 1oo°C. However the polyester shrinks heavily therefore, it should be
controlled.
The process of bringing dimensional stabilility in synthetic fibre fabrics is known as heat setting. OBJECTS
1 It gives Dimensional Stability to synthetic
goods.
2. It gives Crease Resistance property.
3. It improves the Resistance to pilling
4 It improves some dyeing properties.
TYPES OF HEAT SEITING
Pre setting -
Before all wet processing Intermediate- After bleaching and scouring Post
setting - After all wet processes.
However, this type will give Dye Migration problem and Dye Sublirnation
problem
CONDITIONS FOR HEAT SETTING
The method involves in subjecting the fabric
at High C Temperature under control (180- 200°C) for a definite time (s0-40 seconds ).This temperature does
not come under normal processing conditions. The fabric is allowed to shrink
during heat setting
The
heat set fabric will not shrink in heat unlessoand until the temperature and
time of heat setting is not crossed The process of heat setting is normally
carried out on Pin stenters or in curing ovens
PARAMETERS1. Time of heat setting2. Temperature of hear setting 3 Over feeding l 4 Tension of the fabric Tension during heat setting is also an important factor .It will disturb Diffusion and Fixation process |