Calculate The Twist Per Inch& Twist Multiplier Of Double Yarn By Straightened Fibre Method.

OBJECT:

            Calculate the twist per inch& twist multiplier of double yarn by straightened fibre method.

INSTRUMENT/TOOLS:

            Double yarn twist tester etc.

WORKING PRINCIPLE:

            On untwisting a double yarn the two strands of yarn get straightened and separate into two parallel yarns ,  this gives the no of  turns in the yarn.

PROCEDURE:

•        Take a sample of yarn and find tex count.

•        Fix the length of 10 inch on gauge.

•        Put the half of tex count as tension as dead weight.

•        Clamp the yarn between tensioning arrangement , fixed jaw and rotating jaw.

•        Now rotate the rotating jaw till the both yarnsparallel.

•        Put the needle in between strands of yarn and untwist it till all twists are removed.

•        Note the reading on counter and repeat the same process for 20 samples.

FORMULA:

Twist per inch    =        total revolutions

                                        Length of yarn x  2

RESULT:

            TWIST PER INCH ……………………………………………………..

            STANDARD DEVIATION……………………………………………………..

            COEFFICIENT OF VARIATION ………………………………………………………

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 rotating jaw.