Why does the width of the flame retardant fabric become smaller?

Flame-retardant fabric refers to a fabric that can be automatically extinguished within 12 seconds after leaving the open flame even if it is lit by an open flame. According to the processing sequence, it can be divided into two types: pre-treatment flame-retardant fabric and post-treatment flame-retardant fabric, but the flame-retardant fabrics produced by these two processing methods have little difference in flame-retardant properties.
Before entering the topic, let's first understand what is the width
Width refers to the effective width of the woven or knitted fabric in the weft direction. It is generally used to express in inches or centimeters. The common ones are 36 inches, 44 inches, 56-60 inches, etc., respectively called narrow, medium and wide Width, fabrics higher than 60 inches are extra-wide, generally called wide-width fabrics. Today, the width of extra-wide fabrics in my country can reach 360 cm.

Why does the width of the flame-retardant cotton fabric become smaller?
According to the different proportions of cotton-containing flame-retardant cloth, it is divided into cotton flame-retardant cloth, C/N flame-retardant cloth and CVC flame-retardant cloth; Aramid flame-retardant cloth is a fabric synthesized with aramid flame-retardant fiber. This kind of natural flame-retardant fabric has the advantages of heat resistance, high strength, high wear resistance, good flexibility, low shrinkage, stable chemical structure, no droplets in combustion, no toxic gas, etc. The shrinkage rate of products with different materials after washing It will be different.
So what are the main factors that affect fabric shrinkage? To find the reason for the narrowing of this width, we need to look for it from the process of flame retardant pretreatment. So let's first sort out the basic processing steps of flame retardant fabrics. They are "desizing-scouring-bleaching-mercerizing-dyeing-flame retardant treatment-stenter setting-pre-shrinking". The last two steps in the steps are the key steps to ensure the stability of fabric washing.
Then the problem lies in the last few steps. Here, let me explain the concept of mercerizing. Mercerizing is a process of stabilizing the structure of the fabric. Generally, there will be a width after mercerizing, but the width of the fabric will increase after stentering The step of stenting and setting cannot be exposed to water. Once it encounters water, it will return to the width of the mercerizing stage. The pre-shrinking is the last step set to solve this problem.
However, many small workshops and informal manufacturers sometimes omit this last step in order to save costs, and measure the width of the fabric according to the width after tentering, thus ignoring the fact that the width of the fabric will change after washing, so choose It is the right way to choose a guaranteed company when flame retardant fabrics.