# What is WPI and CPI in knitting?

Contents

## What is WPI in textile?

WPI: wraps per inch, the number of times a yarn around a 1″ space on a ruler or pick-up stick. PPI: picks per inch, the number of weft threads in one inch of woven fabric. EPI: ends per inch, the number of warp threads in one inch of woven fabric. It is often used interchangeably with sett (see below)

## How does yarn count affect fabric?

The impacts of yarn count and stitch length were measured concerning pilling resistance, abrasion resistance, and shrinkage and tightness factor. The result showed that the fabric pilling grade decreased while number of cycle increased.

## How do you calculate wales per inch?

Ans.: TF = 14.7 = √tex/loop length cm Loop length inches = l = 0.146 Wales/inch = KW / l = 4.29/0.146 = 29.38 Machine gauge for yarn of 20s Ne = 20 Open width of tube of diameter 26″= 81.68″ Number of wale lines in fabric = Number of needles in machine = 29.38 x 81.68″ = 2400 = π x machine diameter x machine gauge …

## What does EPI mean in yarn?

Overview: The number of yarn ends per inch (or EPI) is the number of warp strands you must warp in one inch on the loom. It affects the design and appearance of the weaving. It can also influence the visibility of the weft yarns.

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## What does 200gsm mean?

GSM in fabric, also known as grams per square metre is simply the metric measurement of the weight of a fabric. … The higher the GSM number, the denser the fabric will be. For example, if the label on a linen shirt reads 180-200 GSM, the shirt material would be thick and would probably keep one warm.

## What does 300gsm mean?

GSM stands for Grams per Square Meter (g/m2). It is the weight of the fabric if you take a sheet of material which is one meter by one meter square and weigh it in grams. … So a 300 GSM material can vary in weight between 291 and 309 GSM.

## What does S mean in yarn?

The S number often is used in conjunction with the word “super” which originally meant the best wool, (called choice wool in the United States) As now used Super means pure new wool and can also be used for fabrics made from wool blended with rare fiber (such as mohair, cashmere wool and alpaca), and also with silk.

## Which yarn is finer 40s or 60s?

To look at it the other way, lower the count, the heavier and coarser it is. Thus 40s thread count yarn is coarser and heavier than a 60s yarn and so on.

## How do you calculate dye capacity?

So, the capacity of a package dyeing machine can be estimated in below formula. Average Production Capacity = (Batch Loading Capacity * Machine Efficiency * 24 / 10) kg/day. If an 85% efficient machine has capability of dyeing 500 kg yarn in each batch, average production will be 1020 kg/day.

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## How do you find the length of a loop?

Loop length is found by dividing the stretched yarn length by the number of loops in one course and expressed as follows: Loop length ( ) = uncrimped yarn length in one course/number of loops in one course ( ) [3].