Ipi Stands For Imperfection Index Of Yarns 333l58

IPI (Imperfection Index)

IPI stands for Imperfection Index of yarns , For ring spun yarn imperfections in the yarn refer to the total number of thin places (-50%), thick places (+50%) and neps (+200%) present per 1000 metre of yarn.   

A thin place of -50% mean the cross-section of the yarn at the thick place is only 50% of its mean cross section or less. A thick place of +50% means the cross-section of the yarn at the thick place is 150% of its mean cross section or more. +200%Neps indicates the cross-section at the nep is 240% of the mean crosssection of the yarn or more.

Imperfections can both be the cause of ends down in downstream processing and also make a disturbing appearance in the fabric.

CSP (count strength product)

The product of the lea strength in lbs and count (English System) is the Count Strength Product (CSP). A lea of 120 yards is wrapped with a wrap reel, having 1.5 yard cisrcumference. The reel is fitted with a traversing mechanism that will minimise the bunching of yarn on the reel. These leas are relaxed on a skein holder and conditioned in the Standard atmosphere ( Temp. 27°C and R.H. 65%) Count Measurement : The lea is taken and tested for cotton count with 'Auto Sorter'. Lea Strength: Breaking load is tested with a lea strength tester which gives the breaking load in lb (pounds) force, this lea strength ester is a pendulam type with constant rate of traverse, the moving clam operating at a uniform speed of 12 inches/minute. After the strength is tested , the mean lea strength and the mean count are calculated and Multiplying them to determine the CSP of that yarn .