Waterproof zipper is a type of nylon zipper, which is a specially treated nylon zipper. Special treatments for waterproof zippers include: pasting PVC, pasting TPU film, soaking, and coating waterproof zippers. Among them, waterproof zippers with TPU film are high-end products of waterproof zippers.
TPU waterproof zippers were developed by YKK zippers in the 1990s. Due to the TPU waterproof zippers, they are cold-resistant to -40°C and high-temperature resistant to 100°C. They are waterproof, breathable, low-temperature resistant, and soft. TPU waterproof zippers have always been well received by customers at home and abroad. The performance of the coated waterproof zipper is: no shedding, no whitening, no brittleness, low temperature resistance of minus 70 degrees Celsius, environmental protection, softness, and good waterproofness.
PVC film waterproof zippers must contain azo, and the current EU requirement is less than 100PPM. The main material used in PVC film waterproof zippers is PVC, whose full name is Polyvinylchlorid. The main ingredient is polyvinyl chloride, and other ingredients are added to enhance its heat resistance, toughness, and ductility. The upper layer of this film is paint, the main component in the middle is polyvinyl chloride, and the lower layer is back-coated adhesive. PVC can be divided into soft PVC and hard PVC. Soft PVC is generally used for floors, ceilings and the surface of leather. However, because soft PVC contains softeners (this is also the difference between soft PVC and hard PVC), it easily becomes brittle and difficult to preserve, so its range of use is not widespread. Hard PVC does not contain softeners, so it has good flexibility, is easy to form, is not brittle, is basically non-toxic and pollution-free, and has a long storage time. Therefore, it has great development and application value and a broad market. There are two reasons why PVC can be widely used: one is the unique properties of PVC (rainproof, fire-resistant, antistatic, easy to form); the other is the characteristics of low investment and high output of PVC. PVC waterproof zippers take advantage of the waterproof properties of PVC.
TPU is an environmentally friendly polymer, its Chinese name is thermoplastic polyurethane, also known as waterproof and breathable membrane. It is a new environmentally friendly material that has become a major breakthrough in the application of waterproof and breathable fabrics. It overcomes many shortcomings of PVC waterproof zippers. It not only has most of the properties of rubber and ordinary plastics, but also has excellent physical and chemical properties, so it is also called the material of the future. TPU film is a film made of TPU granules through a special process. It inherits the excellent physical properties of TPU and has an extremely wide range of applications. Because TPU overcomes many of the shortcomings of PVC, TPU waterproof zippers are also superior to PVC waterproof zippers in terms of performance. Waterproof zippers can function as waterproof when it rains or encounters rainwater. Waterproof zippers are also used on seamless products. Waterproof zippers are divided into civilian waterproof zippers, industrial waterproof zippers, watertight and airtight zippers. Watertightness and airtightness have relatively high requirements for waterproofing. The waterproof performance of so-called waterproof zippers is limited, and it basically refers to the purpose of simply preventing water splashing. In fact, the English meaning is not waterproof but water-resistant (i.e. water-resistant zips, not water-proof zips). The British Trail magazine has conducted a waterproof zipper test on this issue in a laboratory that specializes in testing the waterproofness of clothes. The results show that , if the water-resistant zips of the clothes are directly exposed to the external environment, then it can only pass the static test, but not the dynamic test. And if the clothes have stormflap outside the water-resistant zips (normal zippers require 2 layers, water-resistant zips require 1 layer), the style can refer to Mountain Hardwear, and it can pass the dynamic test. The use of waterproof zippers is opposite to that of ordinary zippers. The surface is flat and there are various gloss levels to choose from. Therefore, the beauty of the product and the practical effect of waterproofing are factors that must be considered when choosing a waterproof zipper. There is no waterproof film on the surface of ordinary zippers. You can see the fabric (nylon, etc.) of the zipper and the teeth of the zipper on the front. However, there is a film on the surface of the waterproof zipper, and the fabric and teeth cannot be seen. Therefore, the surface of the waterproof zipper is smooth, so the zipper is waterproof. There are bright, matte and shiny surfaces. No matter what angle you put an ordinary zipper on, there will be no reflection on the surface. There is a huge difference between ordinary zippers and high-end waterproof zippers when used outdoors. Good waterproof zippers can sometimes be life-saving things in the wild. For example, if the fabric used in a mountaineering bag is not strong enough, it may cause the bag to crack. If the fasteners and webbing are of inferior quality, they may cause the fasteners to break at low temperatures or break under load. What should you do if you encounter these situations during mountaineering? High-end mountaineering bags have high requirements for these materials.
Waterproof zippers are widely used and are suitable for: cold-proof clothing, ski clothing, down jackets, sailing suits, diving suits, tents, car and boat covers, raincoats, motorcycle raincoats, waterproof shoes, firefighting suits, bags, jackets, fishing suits and other waterproof-related products .
Waterproof zippers should be selected from the following aspects:
1. The waterproof zipper film will not tear. No matter it is at low temperature or repeated washing, the waterproof film is not easy to fall off or tear, so that the waterproof effect can be guaranteed for a long time.
2. Smoothness. It is generally believed that the smoother the zipper, the better the quality of the waterproof zipper. In fact, this is not the case. There are certain index requirements for the smoothness of waterproof zippers. Anything that meets this index requirement is a high-quality product. Of course, it is not In order to save costs, some businesses have reduced the material used in the code tape itself, which seems to be smooth to use, but it also greatly reduces the pull resistance and wear resistance of the waterproof zipper.
3. The surface of the waterproof zipper film is flatIt is neat, delicate and has a smooth leather-like feel, which is the appearance of a high-quality waterproof zipper.
4. The color difference of colored waterproof zippers should be small. The difference between the color of the zipper tape and the fabric is the color difference. The color difference between the color of the film surface and the color of the tape surface should be controlled within 5%.
5. In addition to color difference, you should also pay attention to the color fastness of waterproof zippers. Whether the color fastness of the zipper reaches the standard level and whether there will be color migration between the zipper and the clothing will directly affect the quality of the waterproof zipper product.
a. Color fastness mainly includes the washing and friction resistance of the product. It generally refers to the degree of fading of dyed fabrics under the action of external factors (extrusion, friction, soaping, rain, exposure, etc.) during use or processing. . We should pay attention to the three color fastnesses of zippers: sun fastness, soap fastness and color migration, so as to avoid the occurrence of these problems and improve the quality of waterproof zippers.
b. Sunlight fastness: Sweat stains occur with sun exposure. Therefore, the sun fastness is not a single one, it includes dual fastness to sun and perspiration. Different degrees of sunlight will cause a series of photochemical reactions to destroy the structure of the dye itself, resulting in discoloration and fading. At the same time, the presence of sweat will make the pH value appear weakly acidic or weakly alkaline, which will also significantly reduce the sunlight fastness of some disperse dyes. Therefore, this composite effect is very different from simple light fastness or perspiration fastness. The sun fastness of this composite can be enhanced by taking some precautions so that the color of the waterproof zipper remains bright for a long time. When choosing some zipper products, you should choose those that have been treated with UV resistance enhancement or directly choose waterproof zippers with high sun fastness.
c. Soaping fastness: The soaping fastness of the zipper tape is also an important indicator. For waterproof zippers, it is even more important. It is directly related to the waterproof effect of the waterproof zipper. General zipper tapes are woven from 100% polyester and dyed with disperse dyes at high temperatures. The soaping fastness of disperse dyes refers to the degree to which single fiber or multi-fiber cloth will be stained by fading of the dyed material under certain washing conditions. Since disperse dyes are dispersed inside the polyester, and the dispersion concentration of the dye gradually decreases from the surface layer of the fiber to the inner layer, more dye molecules accumulate in the surface layer. Therefore, the quality of soaping fastness depends on two aspects: first, the force between the dye itself and the fiber molecules. If the force is large, the dye molecules will be difficult to be soaped out of the fiber surface; second, the finishing process after dyeing , the residual amount of dye molecules on the surface of the fiber. If the post-processing is thorough, the residual amount of dye on the surface will be very small. It will be difficult for the waterproof zipper tape to fade after soaping.
However, there are many soaping standards, such as temperatures of 40°C, 60°C and even higher 95°C; there are many types of detergents, including phosphorus-free and phosphorus-based; and the washing time also varies. Therefore, under different washing standards, the obtained waterproof zipper tape fastness is not comparable. Moreover, high soaping intensity will cause the tape fastness to decrease. Therefore, in the normal washing process of clothes, it is not advisable to use high-temperature water and excessively strong detergents for waterproof zippers. Generally, the temperature should not be too high, neutral and weakly alkaline detergents should be used, and the time should not exceed 30 minutes, etc. It is important when choosing zipper products to choose products with higher soaping fastness as much as possible.
d. Color migration problem: Many waterproof zipper manufacturers often use materials with special properties, such as PVC, PE cloth and various functionally coated fabrics. The processing technology of these fabrics is complex and some plasticizers usually remain. , solvents and other chemical additives. Due to the presence of additives, when in contact with the fiber tape for a long time, the additives will penetrate into the fiber and make it easier for the dye molecules to diffuse from the inside of the fiber to the surface. If the fabric is white or light-colored, the fabric will stain easily. To solve the problem of color migration of waterproof zipper tapes caused by diffusion, a good way is to check whether the dye used can combine well with polyester fibers when choosing a waterproof zipper. Zipper is an important auxiliary material for clothing, and its various indicators directly affect the quality of finished clothing. When choosing a waterproof zipper supplier, you must also understand the indicators of all aspects of its products.
6. Waterproof zippers need to be environmentally friendly and pass the OEKO-TEX100 standard.
Oeko-Tex Standard 100 was formulated in 1992 by the German Hohenstein Research Association and the Vienna-Austrian Textile Research Association. There are now 13 testing associations, whose main task is to detect harmful substances in textiles and determine their safety. Oeko-Tex Standard 100 is now a widespread ecolabel for textiles. Most textiles and fabrics pose no real hazard to humans. But people still want to buy fabrics, bedding, and home textiles that have been tested and determined not to be contaminated with harmful substances in any way. This does not mean that textiles are not treated with chemicals. The European Textile Research Association has accumulated many years of work experience in order to obtain standards for measuring the ecological quality of textiles in an objective and scientific way. The standards specified by Oeko-Tex Standard 100 are based on new scientific knowledge and set limits on the content of harmful substances in yarns, fibers and various types of textiles.��. Only manufacturers that provide demonstrable quality guarantees in accordance with strict testing and inspection procedures are allowed to use the Oeko-Tex label on their products. The International Association for Ecological Research and Testing of Textiles guarantees that Oeko-Tex Standard 100 lives up to its promise: trust in textiles. Protecting the safety of all consumer needs when it comes to style, color, functionality and fiber care.
7. Waterproof effect. The size of the middle seam is directly related to the waterproof effect of the waterproof zipper. If it is too large, it will obviously not have the waterproof effect and lose the meaning of the waterproof zipper itself.
8. Service life. The quality of the film attached to the waterproof zipper is directly related to the service life of the waterproof zipper.
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