General knowledge-half a cat talks about backpack buckle common sense

The composition of the backpack generally includes: fabric + waterproof glue + buckle + zipper + webbing + back panel (pvc) + mesh. Only the buckle is introduced here.

buckles can be seen everywhere in our daily lives, ranging from clothes, shoes, hats, backpacks, camera bags, mobile phone bags, and even MM close-fitting bras. All have buckles. As a true outdoor enthusiast, it is necessary to understand the performance of backpacks. It is also necessary to increase the knowledge of fasteners. The common fastener brands are basically "Duraflex", "ITW" and "nifco". Other brands include Zhengan and Weisheng. Of course, the most famous is "Duraflex", but in terms of performance, "ITW" and "nifco" are not much inferior to the former.

Duraflex has three subsidiary companies, namely: NATIONAL MOLDING (American Mold Center), South Korea's woojin-duraflex, and Hong Kong's utx-duraflex. Lidun Button Accessories Company in Shenzhen, China is the authorized manufacturer of Duraflex in Mainland China. WOOJIN DURAFLEX is a Korean authorized production plant of NATIONAL MOLDING in the United States, and DURAFLEX is a registered trademark of NATIONAL MOLDING.

You can see the words UTX-DURAFLEX and WOOJIN-duraflex on the back of the buckle, which just mark the name of the factory on it. Similarly, NIFCO fasteners have several names, TIFCO, and KIFCO is also the company's product. ITW-NEXUS is actually a subsidiary of ITW, which specializes in manufacturing fasteners. The quality is quite good and the professional is very strong. You don’t need to mention other unfamous fasteners. If you are interested, you can buy them by catty (it is said that they are bought by sack in Quanzhou, Fujian).

"Duraflex", "ITW" and "nifco" products not only have a strong low temperature resistance performance of minus 30 degrees (many fasteners are easy to brittle under low temperature conditions), but also do not suffer from excessive bending deformation (90 degrees). Will break. Its toughness is staggering. Product quality is very important in outdoor sports such as high safety. Otherwise, the buckle will suddenly stop fart during the outdoor journey. It really makes you cry without tears and no way to call the police. Now let me introduce the buckle. Types and materials of tools.

1. Classification of fasteners (more cumbersome)

Backpack buckles are generally divided into buckles (also called side buckles), day buckles, ladder buckles, hook buckles, rope buckles, and some more special purpose. Now let’s introduce the characteristics, uses and strength of these fasteners.

1, buckle

The materials selected are generally POM (polyoxymethylene, commonly known as Saigang), PP and NY

The buckle consists of a male buckle and a female buckle. One end is fixed with a webbing, and the other end can be adjusted by a webbing. The length of the webbing can be selected according to different needs. It is generally used for fixing the shoulders and waist. In order to more effectively play the role of the buckle, the production company is also making continuous changes to reduce the weight while ensuring the same strength, such as the v-shaped buckle. There are also three-way buckles, that is, "Y" buckles, which are often used on safety products such as strollers and taxi safety belts. Of course, depending on the backpack, there are sewn buckles, rotatable buckles, etc., in terms of craftsmanship You can also authorize the design of color labels or LOGO on the face of the female buckle, or you can choose electroplating, silk printing, and color painting. Depending on the feel, it can also be polished, sprayed with rubber oil, etc.

In terms of strength, the 25mm buckle used in a general casual backpack can withstand a weight of 40-50 kg. Of course, a good buckle can reach 80-90 kg. The masterpiece of the buckle is undoubtedly the lobster of duraflex, and the fully hollow buckle of ITW-NEXUS has been dominating for many years.

2, day deduction

The materials are generally POM, PP, NY

Generally speaking, the day buckle is used on the shoulder straps of backpacks and shoulder bags to adjust the length of the webbing. In order to prevent slippage, many day buckles are designed with stripes in the middle of the buckle, and there are also two bars on the side that are enlarged to place themselves Most of the logos are similar in shape.

3, ladder button

Its material is generally PP, POM, NY ladder buckle, which is also used to shrink the webbing, which is generally used at the tail of the shoulder strap to adjust the fit of the backpack. In terms of the shape and function of the ladder button, there are not many classics. Duraflex's duckbill ladder button can be regarded as an immortal classic.

4, rope buckle

Its materials are generally PP, NY, POM

Using the elasticity of the spring ring, the rope is stuck in a misplaced position. The diameter of the rope mouth can be selected, single hole and double hole, suitable for all kinds of OO rope, nylon rope, elastic rope. LOGO can be designed according to customer requirements. The design of rope buckles is very different from before, with a wide variety of metal materials.

5, hook button

Its materials generally come from PP, NY, POM

hook buckle is generally used on the side of the shoulder bag, one side is connected to the D ring, and the other side is connected to the webbing. Many alloy elements have now been added to make the hook stronger. I won’t introduce the others.

2. The characteristics and uses of the raw materials of the fasteners (see attached table)

Click on the picture above to see the big picture

Three, the test of the fastener

There are two main aspects of the buckle in the testing process:

One: Tensile test, this test is mainly to detect the bearing capacity of the fastener, it is divided into two steps to complete:

1. Instant tensile test, mainly used for buckle, D buckle, day buckle, to test the strength of the buckle when suddenly encountering strong tension.

2. Enduring tensile test. Its main principle is to determine the time value of the buckle when a certain load is determined.

3. There is also the detection of the number of times of use of the buckle. It is opened and closed continuously to test how many times the buckle will be deformed.

Three-direction or multi-direction buckle detection is even more complicated.

Second: Temperature test, this is mainly to test the endurance of the buckle at unconventional temperatures, divided into two types: high temperature and low temperature

1. The high temperature is usually set at 70 degrees Celsius

2. The low temperature is usually set at minus 30 degrees. The time is 24 hours, and then the change in intensity is tested.

The third: is the salt spray test. This test is mainly to monitor the salinity of the buckle. Some products can only be transported by sea. Long-term operation at sea will affect the quality of the product. This test is also divided into two steps. .

1, soak the fastener in sea water for 72 hours

2. Put the soaked fasteners in the sun for 5-7 days

3. After the completion of the test, has the test intensity changed too much?

There are also some such as acid resistance tests, which can be tested according to different needs and materials. Among them, metal fasteners must be tested for rust resistance, corrosion resistance, and drug resistance. Plastic If the fastener is subjected to post-processing of the product, such as electroplating, water dyeing, oiling, etc., further tests are required for the eligibility of these additional processes.

Of course, there are higher standard tests applied to diving and other extreme sports. What UL certification, TS16949 certification, VDA6.0 standard can not be passed by ordinary fastener manufacturers.

The above is a brief introduction to the fasteners. With the continuous development of products, the varieties are becoming more and more diversified, and the testing in this area is becoming more and more stringent.

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