In daily life, we often encounter various problems, such as buying a piece of clothing, washing it once, shrinking it and becoming smaller and no longer fitting. Don't wear it from now on, unfortunately; hard to put on the street, ridiculous, and finally fall into a dilemma. What are the reasons that make clothes washed and shrink?
Shrinkage is a phenomenon in which the length or width of a textile undergoes washing, dehydration, and drying processes in a certain state. The degree of shrinkage involves different types of fibers, the structure of the fabric, the different external forces acting on the fabric during processing, and so on. The performance of the research is now examined one by one.
In fact, as long as it is a fabric, it shrinks, but the degree of shrinkage is different. There is a single word to explain specifically, the shrinkage rate. Shrinkage is the percentage of shrinkage of a fabric after washing or soaking.
What about the shrinkage rates of the types of fabrics that we usually use? Cotton products in 4% to 10%, chemical fiber 4% to 8%, cotton and polyester 3.5% to 5.5%, natural white cloth 3%, blue cloth 3% to 4%, poplin 3% to 4.5%, cloth For 3% to 3.5%, Khajwata is 4% to 5.5%, twill is 4%, å“—å½ (premium wool) is 3% to 4%, labor cloth is 10%, and rayon is 10%. Then we can know that the shrinkage rate of synthetic fibers is the smallest, followed by cotton and linen fabrics, silk fabric shrinks more, viscose fibers, rayon, and artificial wool fabrics have the largest shrinkage rate. As long as the shrinkage rate is within the range of 3% to 4%, you can feel comfortable buying and washing.
Shrinkage phenomenon:
(1) When the fiber is spinning, or when the yarn is weaving and dyeing, the yarn fibers in the fabric are stretched or deformed by the external force, and the internal stress of the yarn fiber and the fabric structure are generated in the state of static dry relaxation. , Or the state of static wet relaxation, or in the state of dynamic wet relaxation, full relaxation, the release of stress in varying degrees, so that the yarn fibers and fabrics returned to the initial state.
(2) Different fibers and fabrics have different degrees of shrinkage depending on the characteristics of their fibers - the degree of shrinkage of hydrophilic fibers is greater, such as cotton, hemp, viscose and other fibers; and the shrinkage of hydrophobic fibers. Less, such as synthetic fibers.
(3) When the fiber is in the wetting state, it expands due to the action of the immersion liquid, which causes the fiber diameter to become larger. For example, on a fabric, the radius of curvature of the fiber that forces the interweaving point of the fabric increases, resulting in a shortened length of the fabric. For example, the cotton fiber is Under the action of water, the cross-sectional area increases by 40~50% and the length increases by 1~2%, while the synthetic fiber shrinks by heat, such as boiling water shrinkage, which is generally about 5%.
(4) Under the heating condition of textile fiber, the shape and size of fiber will change and shrink, and it will not return to the initial state after cooling, which is called fiber thermal shrinkage. The percentage of the length before and after heat shrinkage is called the thermal shrinkage rate. , In general, boiling water shrinkage test, in boiling water at 100 °C, the percentage of fiber length shrinkage is expressed; also use hot air, measuring the percentage of shrinkage in hot air over 100 °C, also useful steam, at more than 100 °C The percentage of shrinkage was measured in the steam. The performance of the fiber was also different due to internal structure, heating temperature, and time. For example, the boiling water shrinkage of the processed polyester staple fiber was 1%, the shrinkage of vinylon boiling water was 5%, and the heat of the Kleenex was The air shrinkage is 50%. The fiber has a close relationship in the textile processing and the dimensional stability of the fabric, providing some basis for the design of the post process.
(5) In addition, wool products still have a problem of shrinkage. We know that these fluffy surfaces have scales, but after washing, these scales are inevitably damaged, and problems such as shrinking deformations occur. Therefore, sweaters are a kind of fabric that needs special attention to the problem of shrinkage.
As long as we are purchasing cloth, we must fully consider the shrinkage rate of different fabrics, and pay attention when cleaning, then we can try to avoid shrinkage and deformation of the clothing.
For more content, please follow this site
Men Formal Shoes Leather Welt Cement Bonwelt Construction
Ture Potential Limited , https://www.ldgsshoes.com