First, shrink
Physical methods are used to reduce the shrinkage of the fabric after water soaking to reduce the shrinking process, also known as mechanical preshrinkage. Pre-shrinking is mainly to control the warp shrinkage of the fabric. The shrinkage of the pre-shrinkage material is usually 7 to 8%. After shrinking, the shrinkage of the fabric is required to reach 3% of the national standard or 3% of the American standard. Due to different drying methods, the American Standard requires a relatively high level, and American Standard 3% is equivalent to 1% of the national standard.
Second, washing
Washing is to add softener or detergent in the water, directly to the next time the fabric water, according to the washing time and the amount of softener, generally divided into light washing, general washing, heavy washing. The effect after washing is that the fabric will become very soft, very feel, and there will be an illusion that the fabric becomes thicker.
Third, sand washing
Sand washing and washing process is actually similar, but the addition is not the same thing, is generally added alkaline or oxidizing additives, of course, will also add some amount of softener. The addition of alkaline additives is to destroy the surface of the fabric, so that the fabric after the sand is washed feel softer, and then the surface of the fabric will play some fluff, there will be a light layer of white fog. Therefore, after sand washing, the fabric will become soft and will be napped. The fabric will have a kind of thick illusion, but such fabrics are easy to crinkle. If you gently pull it, it may break. We generally do not recommend thin fabrics. Sand wash.
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