The second part is mainly for the fastness of cloth, according to the request of the consumer, new standard of cloth color fastness requirements changed, abandoned the washing color fastness, increase the requirements for color fastness to soaping.
1. The requirements on color fastness of the chain: colour fastness in national standards have many projects require, in the zip line standard choose the colour fastness to rubbing requirements. It is divided into dry friction staining fastness and wet rubbing staining fastness two. In the new standard, on the two projects requirements has provided high, old standard for grade 3, grade 4, the new standards for grade 4;
2. the color fastness to washing, which is based on the actual use of the zipper in recent years a new increase in the situation.
The third part is the change of appearance after washing and drying. It is a new item in the new standard. This item has six main parts, which are mainly used for clothing:
(1) requirements after washing and drying after the zipper with a shrinkage rate of less than 2%, this is very important to keep a distance from the zipper chain teeth of stability, and pulls the light smoothness, flatwise tensile strength have a relationship, the zipper flatness is big;
(2) is the color of the garment zipper requirements, the requirements after washing, the entire zipper, including accessories are still maintained the original color, little change;
(3) is of clothing zipper pull head of washable requirements, requirements pull head pull slice edge / sharp edges (does not include the cap cover) decorative layer off, bare copper, color should not be more than three, each maximum length should not more than 2.5mm, and other parts of the decoration layer without falling off.
(4)is on chain tooth surface decoration layer is proposed to wash requirements. Chain tooth surface decoration layer off number less than 10% of the total number of chain teeth, each maximum length is less than 0.5mm.
(5) of parts surface decoration layer is proposed to wash requirements. In addition to the incision and the edge of the site, on check, check, socket, intubation plane part of the decorative layer off, bare copper, the color does not exceed 3, each maximum length is less than 1 mm;
(6) is to strengthen the washing requirements proposed to avoid separating zipper tape, tape and strengthen the white layer phenomenon.