Cropping and

Shearing of Wool

fabric

Mahdi Raza, M.Farhan , Jawad

Hashmi….Presente

d by

Cropping or shearing

mean…..

Cropping: To harvest or reap.

Shearing: To cut off.

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…..

History…………

Known history of

shearing/cropping is marked from

15 century….

At that time it was done manually

by manual tool called shears..

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..

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..

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)……….

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……

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……

Non-sheared fabric

Sheared fabric

Conclusion