Reasons for shrinkage of cotton knitted fabrics
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Cotton knitted fabric flame retardant knitted fabric
The shrinkage phenomenon of cotton knitted fabrics is mainly caused by its extremely easily deformed organizational structure. The basic structure of knitted fabrics is loops. A complex spatial structure is formed by the mutual intertwining of coils. Each coil is divided into three parts, loop column, needle arc and sinker arc. The distance between the transverse corresponding points of two adjacent coils is called the loop pitch, and the distance between the longitudinal corresponding points is called the loop height. The loop columns and loop arcs of the coil can transfer to each other under the action of external force. Therefore, the knitted fabric is extremely easy to deform. Under normal circumstances, each knitted fabric has a relatively stable structural form, represented by a density contrast coefficient, which is equal to loop height/loop pitch or transverse loop density/longitudinal loop density. When the knitted fabric is stretched longitudinally, the loop height increases, the loop spacing decreases, and the density contrast coefficient increases, causing it to break away from the stable structural form. When the external force is removed, it can gradually retract and return to a stable state. If the knitted fabric is subjected to a large external force, or is subjected to repeated external forces, the coils will be greatly deformed, the knot points will be in close contact, and the structure will be far from a stable state. This unstable state can be restored to its original state through relaxation under the action of water and external force, which leads to shrinkage. In addition, the internal stress generated by the deformation of fibers and yarns under the action of external forces will also cause the shrinkage of fibers and yarns through the relaxation of stress by water molecules, resulting in shrinkage.
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