Backpack composition generally includes: fabric + waterproof glue + buckle + zipper + webbing + backplane (pvc) + mesh. Here only introduce the buckle. Fasteners can be found everywhere in our daily life. We usually use clothing, shoes, hats, backpacks, camera bags, mobile phones, and even bras for MM. There are buckles. As a true outdoor enthusiast, understanding the performance of a backpack is essential. A good fastener product not only has strong low temperature resistance of minus 30 degrees (many fasteners are brittle under low temperature conditions), but also does not break under excessive bending deformation (90 degrees). Its toughness is astounding. Product quality is very important in outdoor safety sports. Now, Gumi will introduce you to the types and materials of fasteners. First, the classification of fasteners Backpack fasteners are generally divided into buckles, day buckles, eye buckles (also known as ladder buckles), hook buckles, and rope clasps. There are also some special uses. Now let us introduce the characteristics, use, and strength of these fasteners. 1, buckle The material of choice is generally POM (polyoxymethylene, commonly known as Saigang), PP and NY The buckle is composed of a male buckle and a female buckle. One end is fixed with a webbing, and the other end can be adjusted through a webbing. The length of the webbing is selected according to different needs, which is generally used for fixing shoulders and waists. In order to play the role of buckles more effectively, the company also continues to make changes, while reducing the weight, while maintaining the same strength, such as v-type buckle. There are also three direction buckles, namely "Y" type buckles, which are commonly used in baby carriages, taxi seat belts and other safety products. Of course, according to different backpacks, there are sewn-in buckles, rotatable buckles, and so on. Can also be authorized on the surface of the female buckle design color or LOGO, you can also choose plating, silk screen, painting. According to the different touch can also be polished, spray rubber oil and so on. In terms of strength, the 25mm buckle used in casual backpacks can bear a weight of 40-50 kg. Of course, a good buckle can reach 80-90 kg. 2, the day buckle Its material is generally POM, PP, NY In general, the day buckle used in the backpack's shoulder strap, shoulder bag shoulder bag, used to adjust the length of the webbing, in order to prevent slipping, many days the middle bar is designed with stripes, but also the next two bars to expand their own The logo is almost the same in shape. 3, head buckle Its materials are generally PP, POM, NY The role of the ladder buckle is also the shrink webbing, generally used in the tail strap, adjust the degree of the backpack's personal. 4, rope buckle Its material is generally PP, NY, POM With the elasticity of the spring ring, the rope can be misplaced. The size of the rope can be selected, single hole and double hole, suitable for various OO ropes, nylon ropes and elastic ropes. The LOGO can be designed according to the customer's requirements. The design of the rope ties has been greatly different from the past. There are various types of metal cords. 5, hook buckle Its material is generally derived from PP, NY, POM The hook is generally used on the side of the shoulder bag. The d-ring is connected on one side and the webbing on the other side. Now that many alloying elements have been added, the strength of the hooks is greater. Second, the buckle test There are two main aspects of fasteners in the testing process: The first one is the pull test. This test is mainly used to detect the bearing capacity of the fastener. It is divided into two steps to complete: 1, instant pull test, mainly used for buckle, D buckle, day buckle, when the test suddenly encountered a strong pull, the strength of the fastener. 2, the lasting pull test, its main principle in determining the load of a certain weight, the time value of the fastener. 3, on the use of the buckle buckle there is the use of detection, non-stop opening and closing, to test how many times, the buckle will be deformed. Secondly, it is a temperature test. This is mainly to test the endurance of fasteners at unconventional temperatures. It is divided into two types: high temperature and low temperature. 1, high temperature is usually set at 70 degrees Celsius 2, low temperature is usually set at minus 30 degrees. The time is 24 hours and then test the change in intensity. For more information on purchasing information updates, please follow: China Button Trading Network Dinner Set,Non-Slip Ceramic Dinnerware Set,Portable Crockery Dinnerwares,White Jade Dinner Sets shaoxing qinzi business company ltd , https://www.qinzisx.com