• 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
• When warp and weft yarn interlace in fabric they
follow a wavy path. This waviness of yarn is
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.
l= Straightened thread length
P= crimped length
Crimp ratio is the ratio of the yarn length to
the fabric length produced from that yarn.
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 % 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
EFFECT OF CRIMP OF YARN ON FABRIC
RESISTANCE TO ABRASION: With the increase of crimp %,
the abrasion resistance will also increase
SHRINKAGE: With the increase of crimp %, shrinkage of fabric
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
FABRIC STIFFNESS: If crimp is increased then stiffness of fabric will
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
DYE TAKE-UP: With the increase of crimp the take-up percentage
of dye-uptake will also increase.
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.