MY PROFILE
Name : Abdullah Al Mahfuj.
Department : Textile.
Program : B Sc in Textile Engineering .
ID : 142014007
Green University of Bangladesh .

Name of My Presentation
Crimp & Crimp Interchange

LETS START WITH MY
JOURNEY....

Crimp
• woven fabric made of two sets of yarns - warp
yarns and weft yarns. Warp and weft yarns are
interlaced with each another and form fabric
sheet.
• When warp and weft yarn interlace in fabric they
follow a wavy path. This waviness of yarn is
called crimp.

Crimp%
Crimp%:
crimp percentage is defined as the mean
difference between the straightened thread length
and the distance between the ends of the thread
while in cloth which is expressed as a percentage.
Where,
l= Straightened thread length
P= crimped length

Crimp ratio:
Crimp ratio is the ratio of the yarn length to
the fabric length produced from that yarn.
Crimp amplitude:
In cloth geometry, the term crimp
amplitude is used. Crimp amplitude refers to the
extent to which threads are defected from the central
place of the cloth.

Take up%
• Take up % or crimp rigidity is a measure of the
ability of a textured yarn to recover from stretch.
 The difference between length of yarn in the fabric
after weaving, expressed as a percentage of the
length of the yarn before weaving, is called take
up %.
100


L
pL
T

EFFECT OF CRIMP OF YARN ON FABRIC
PROPERTIES
 RESISTANCE TO ABRASION: With the increase of crimp %,
the abrasion resistance will also increase
 SHRINKAGE: With the increase of crimp %, shrinkage of fabric
will decrease.
 FABRIC COSTING: With the increase of crimp%, fabric costing
will also increase.
 FAULTS IN FABRIC: If there is variation of crimp in the threads then
the following faults may be found in fabric;
A) Reduction in strength may occur, and
B) Stripes will be seen in yarn dyed cotton fabric.

 FABRIC DESIGN: To achieve satisfactory appearance and required
shape in finished fabric control of crimp in warp and weft yarn is
necessary..
 FABRIC STIFFNESS: If crimp is increased then stiffness of fabric will
decrease.
 ABSORBENCY: With the increase of crimp % absorbency of the
fabric will increase.
 DIMENSIONAL STABILITY: Dimensional stability will decrease
with the increase of crimp%.
 FABRIC HANDLE: If crimp is increased then the fabric will be soft
in handle.
 DYE TAKE-UP: With the increase of crimp the take-up percentage
of dye-uptake will also increase.

Crimp interchange
 A parameter which is significant for the structure of the fabric
and also for the pore shape and size.
 When the fabric is loaded there is often a change in the ratio of
the crimp of the warp and weft system.
 This change is referred to as crimp interchange.