Usually we refer to the shrinkage of the fabric after washing, but in reality, there are cases where the fabric will shrink after washing, but it can also be stretched after washing, so the change in size is rather. In engineering, this change is calculated as a percentage of the size that changes horizontally or vertically.
Causes for changing the size of the fabric or clothes after washing:
To explain the cause of the change in clothing size after the first washing, it must be based on the composition of each type of fabric material, weaving type, complete processing technology.
Each type of textile material will have different shrinkage characteristics, there are many types of shrinkage such as wool, linen; The type that tends to shrink easily, such as cotton or cellulose, or the least shrinkable materials such as synthetic fibers …;
Other causes such as weaving structure. Knitted fabrics always tend to have large shrinkage, while laboratory woven fabrics are less likely to shrink. In woven fabrics of different weaving types, there are many types of contraction such as dobby, Jacquard weaving types, while conventional diagonal weaving types have less shrinkage.
In general, changing the size of fabric or clothes is a fact that happens to the fabric or clothes. The reason is that the production process from spinning, weaving, dyeing, finishing, sewing and cutting processes tends to change the natural stability of the fiber. In other words, it changes the internal energy of fibers. Clothes and fabrics exist inside an unstable energy and tend to release that energy to have the most stable energy state. The process of washing is the period when the fabric or clothes are processed in water environment, under the impact of vibration, temperature, the presence of detergent … in that environment, the fiber has a persistent bloom. rearranging the structure, releasing internal energy to achieve the most stable state after the water section is slowly evaporated during free drying, no pulling, no forced. Therefore, there appears to be a change in size compared to before washing. Usually this process will end after the fabric’s steady state has been achieved after the first few washings.
So to ensure that the size of clothes does not change after washing, when using, certain fabrics must be checked for shrinkage, before cutting. The change in size or percentage of shrinkage does not affect the size of the clothes after washing so much as the allowable shrinkage of the fabric. For example: the vertical shrinkage of the fabric is 3%, the size of a garment of this fabric is 100 cm in length, after washing, the maximum size of pants allowed is 97 cm, cannot be shorter …