Everyone who is engaged in the textile industry must have encountered this situation. Many customers found that the hand feeling was different from the original sample when they received the ready-...
Everyone who is engaged in the textile industry must have encountered this situation. Many customers found that the hand feeling was different from the original sample when they received the ready-made product. So why is it different? Usually it is because it has been pre-shrunk or washed or sand washed. So what is the difference between pre-shrinking, water washing and sand washing?
1. Pre-shrinking
The finishing process that uses physical methods to reduce the shrinkage of fabrics after being soaked in water to reduce shrinkage, is also called mechanical pre-shrinking finishing. Pre-shrinking mainly controls the warp shrinkage of the fabric. The warp shrinkage of the fabric before pre-shrinking is generally 7~8%. After pre-shrinking, the warp shrinkage of the fabric is generally required to reach the national standard of 3% or the American standard of 3%. Due to different drying methods, the American standard requirements are relatively high. 3% of the American standard is equivalent to 1% of the national standard.
2. Washing
Water washing is to add softener or detergent to the water, and directly give the fabric the next water. According to the washingTime and amount of softener are generally divided into light general washing, general washing and heavy general washing. The effect after washing is that the fabric will become very soft and tactile, and there will be an illusion that the fabric has become thicker.
3. Sand washing
The process of sand washing and water washing are actually similar, but the things added are different. Generally, alkaline or oxidizing additives are added. Of course, some softeners are also added in appropriate amounts. And adding alkaline additives is In order to destroy the structure of the fabric surface and make the fabric feel better after sand washing Soft, then there will be some fluff on the surface of the fabric, and there will be a light layer of white mist. Therefore, after sand washing, the fabric will become softer and velvety, and the fabric will have the illusion of being thickened, but such fabrics are prone to hair loss. It may break if you pull it lightly. We generally do not recommend sand washing thin fabrics.
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