OBJECT:
Determine The Crimp Percentage Of Warp And Weft
Threads By Crimp Tester And Calculate The Corrected Count.
INSTRUMENT/TOOLS:
Crimp tester etc.
WORKING PRINCIPLE:
When
warp and weft threads are interlaced in the fabric. Yarn follows a wavy path.
This wavy path decreases the length of yarn as compared to straight length.
Crimp
percentage is the measurement of waviness in the yarn. Crimp geometrically
considered as the excess length of yarn axis over the cloth length.
Crimp
percentage is determined by fully straightening the particular length of fibre
by applying tension. The mean difference between the straightened length and
distance between the ends on thread in fabric in form of percentage.
PROCEDURE:
•
Take a
sample of warp and weft yarn and find tex count.
•
Mark 24 cm
on warp wise and weft wise then mark 2cm on both side.
•
Put the
half of tex count as tension on tensioning arrangement scale.
•
Mark the
tension as righthand side as reference of weight on scale.
•
Clamp the
yarn betweenfixed jaw and movabal jaw.
•
Mark the
tension as right reference of weight on scale.
•
Now rotate
the moving jaw till the the dead weight rod rises slightly.
•
Note the
reading on counter and repeat the same process for 10 samples for both warp and
weft yarns.
FORMULA:
Corrected count (for indirect system)
Corrected
count = count X ( 1
+ crimp%)
100
RESULT:
CRIMP PERCENTAGE: WARP YARN …………………………………………………
WEFT
YARN…………………………………………………..
STANDARD DEVIATION: WARP YARN ………………………………………………
WEFT YARN………………………………………………
COEFFICIENT OF VARIATION: WARP YARN …………………………………………
WEFT YARN…………………………………………..
CORRECTED COUNT: WARP YARN …………………………………………………
WEFT
YARN…………………………………………………..
PRECAUTIONS:
•
Maintain
proper tension on yarn clamped.
•
Set the
counter to zero error before use.
Check that yarn is properly clamped between fixed
jaw and moving jaw.
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