Choosing a zipper not only needs to focus on chromatic aberration but also three color fastnesses. When choosing a zipper for a garment, it is necessary to first pay attention to whether the color of the zipper tape is different from that of the fabric. This is also known as the color difference. Once again, it is concerned about the color fastness of the zipper tape. For the manufacturer, whether the zipper color fastness meets the standard progression and whether color shifting between the zipper and the clothing will directly affect the quality of the final product.
As a manufacturer, when choosing a zipper supplier, it is necessary to pay attention to the three fastnesses of zippers: light fastness, soap fastness, and color shift, which can also effectively avoid these problems. Improve the quality of clothing.
Fastness to sunlight
In general, sweating occurs with the sun. Therefore, the light fastness mentioned here is not single, it includes double fastness to sunlight and perspiration. Different degrees of sun exposure can lead to a series of photochemical reactions that contribute to the structural destruction of the dye itself, resulting in discoloration and fading. At the same time, the presence of sweat will make the pH appear weakly acidic or weakly alkaline, which will also significantly reduce the fastness to sunlight of some disperse dyes. Therefore, this composite effect is very different from pure lightfastness or perspiration fastness. However, with some precautionary measures, this composite fastness to sunlight can be enhanced, so that the zipper's color can be kept bright for a long time. Therefore, when selecting some zipper products, those that have been subjected to UV-reinforced treatment or directly selected to have high light fastness should be used.
The soaping fastness of the zipper tape is also an important indicator. General zipper tapes are made of 100% polyester and dyed at high temperatures using disperse dyes. The soaping fastness of disperse dyes refers to the extent to which the discoloration of dyeings causes staining of single or multi-fiber cloths under certain washing conditions. Theoretically speaking, since the disperse dyes are dispersed in the interior of the polyester, the dispersion concentration of the dyes gradually decreases from the fiber surface layer to the inner layer, which makes the surface layer gather more dye molecules. Therefore, the resistance to soaping fastness depends on two aspects: one is the size of the interaction between the dye itself and the fiber molecules. When the force is large, the dye molecules are difficult to be soaped out of the fiber surface. In the finishing process after dyeing, the residual amount of dye molecules on the surface layer of the fiber. If the subsequent treatment is thorough, the amount of residual dye on the surface layer will be minimal, and soaping will make it difficult to discolor the zipper tape.
However, due to many soaping standards, such as soaping temperature of 40 °C, 60 °C and higher 95 °C; many types of detergent, generally divided into non-phosphorous and phosphorus; washing time is also a long time. Therefore, the resulting zipper tapes are not comparable under different washing standards. Moreover, high soaping strength can cause the fabrics to have a reduced fastness. Therefore, in addition to telling consumers that in the ordinary clothes washing process, high-temperature water and excessively strong detergents should not be used for zipper tapes, and generally the temperature should not exceed 40°C, and neutral and weakly alkaline detergents are preferred. The time is not more than 30 minutes and so on, the most important thing is to choose some soap-fastness products as much as possible when choosing a zipper product.
Color shifting problem
Many apparel manufacturers often use materials with special properties, such as PVC, PE cloth, and various functional coating fabrics. These fabrics have more complex processing processes and usually have some chemical additives such as plasticizers and solvents. Due to the presence of these auxiliaries, when contacted with the fabric tape for a long time, these auxiliaries penetrate into the fibers and make it easier for the dye molecules to diffuse from the inside of the fibers to the surface layer. If the fabric is white or light, the fabric is easily stained.
To solve the problem of the color shift of the zipper tape caused by the diffusion, the best way is to select the zipper to see if the dye it uses can be better combined with the polyester fiber.
Zipper is an important accessory of clothing. The quality of its various indicators directly affects the final quality of finished clothing. Therefore, when selecting a zipper supplier, it is also necessary to understand clearly the indicators of each aspect of its products.