Cropping and shearing of wool by Mahdi Raza......

1. Cropping and
Shearing of Wool
fabric
Mahdi Raza, M.Farhan , Jawad
Hashmi….
Presente
d by

2. Cropping or shearing
mean…..
 Cropping: To harvest or reap.
 Shearing: To cut off.

3. What is shearing or
cropping in term of
Textile????
 Shearing/cropping is the process
of removing of protruding fibers
from surface of fabric…..
 Wool fiber is preferred for this
process…..

4. History…………
 Known history of
shearing/cropping is marked from
15 century….
 At that time it was done manually
by manual tool called shears..

5. Why we preferred cropping
instead of singeing
here……..?
 Singeing is widely used to remove
protruding fibers of various type
efficiently……
 Shearing is preferred not only for
wool, all protein fibers undergo
this process due to below
reasons….
i. Convolute is formed on there
tips..
ii. Convolute gives harsh feel..
iii. It also variate in shade..

6. How it works…..?
 There are several helical blades
are arranged in series,
 Fabric pass beneath these
blades.
 Direction of blade motion is
opposite to the direction of fabric
motion.
 There is an other vertical blade
called ledger, place beneath the
fabric which shear the other side..

9. Objectives of
Cropping……
 To remove protruding fibers from the
surface of fabric……
 To give clean and smoother appearance
to the fabric……..
 To control pill formation…….
 Designing can also be done by this
method (partial raised effect)……….

10. Advantages of cropping…
 It increases flame retardancy of fabric,
small fiber at surface of fabric attract fire
easily……..
 Increase aesthetic properties like
smoothness , lustre etc…
 In cropping process no threat of fabric
destruction present on occasion of power
shutdown or machine stoppage…….
 It is cheaper and simple……
 It can also produce even hairy effect
which can not be produced in singeing
machine……

11. Down sides of
cropping……
 It is comparatively slow and inefficient
machine ………..
 Multiple treatment is required if finer
results needed……..
 Service is required after every
process…
 For controlled removal of hair slow
cropping is required……

12. Non-sheared fabric
Sheared fabric
Conclusion