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Clothing fabrics shrink, are the reasons for the l


Shrinkage is a phenomenon in which the length or width of a textile undergoes washing, dehydration, drying, etc. in a certain state. The extent of shrinkage involves different kinds of fiber, fabric structure, fabric, different external forces, etc..
The smallest shrinkage is synthetic fiber and blended fabrics, followed by wool, linen and cotton fabrics. The silk shrinks considerably, while the largest are viscose, rayon and rayon fabrics.

Objectively speaking, all cotton fabrics are shrinking and fading, and the key is finishing. Therefore, the general textile fabrics are pre shrunk. It is worth noting that, after shrinking, does not mean that no shrinkage, but refers to shrinkage control in the national standard 3%~4%, underwear materials, especially natural fiber materials will shrink. Therefore, in the selection of materials, in addition to the fabric quality, color, pattern selection, the fabric shrinkage should also be understood.

garment fabric

Causes of shrinkage
In 1, fiber spinning, or yarn in weaving and dyeing, fabric of fiber yarn by external force elongation or deformation, while the yarn fiber and fabric structure stress, in a relaxed state of static, static or wet relaxation condition, or in wet relaxation condition, dynamic relaxation condition the release of internal stress, different degree of the yarn, fiber and fabric to return to the initial state.
2, different fibers and fabrics, the shrinking degree is different, mainly depends on the fiber properties of the hydrophilic fiber has shrunk greatly, such as cotton, linen, rayon and other fibers; while the hydrophobic fibers shrink less, such as synthetic fiber etc..
3, when the fiber is in wetting state, the expansion is caused by the action of the infusion, so that the diameter of the fiber becomes larger, for example, in the fabric, the fiber curvature radius of the weaving point of the fabric is increased, and the length of the fabric is shortened. For example, cotton fibers expand under the action of water, the cross sectional area increases by 40~50%, the length increases by 1~2%, while synthetic fibers on heat shrinkage, such as boiling water shrinkage, and so on, generally around 5%.
4, the textile fiber heating conditions, fiber morphology and size changes and shrinkage, after cooling can not return to the initial state, known as fiber heat shrinkage. While the thermal shrinkage percentage of the length before and after thermal shrinkage is called thermal shrinkage, with boiling water shrinkage test, 100 degrees in the boiling water, the percentage of fiber length contraction are also useful; hot air, hot air in more than 100 DEG C in the contraction percentage, but is also used in the steam vapor. More than 100 DEG C in the contraction percentage. Fiber due to the internal structure and the heating temperature and time under different conditions have different performance, such as processing of polyester staple fiber shrinkage rate in boiling water for 1%, vinylon shrinkage in boiling water for 5%, such as hot air shrinkage rate is 50%. Fiber is closely related to the dimensional stability of textile processing and fabric, and provides some basis for the design of post process.

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