The back seal bag commonly used in the processing of electronic equipment, if you need to carry the main board of the mobile phone, you must put the main board into the self-sealing bag, and then seal the sealing cap of the back seal bag. The main board is not affected by dust and moisture in the self-sealing bag, so let's learn about the production process of the lower back sealing bag together!

The processing technology of magnetic sealing bag based on back sealing bag is to cut overlapping PE films through electric heating wire. The electric heating wire plays a cutting role during thermal cutting. At the same time, the two PE films are thermally bonded during thermal cutting to fix the cutting positions of the two PE films together. However, the magnetic sealing bag, PE film and other PE films produced by this production method have high viscosity after heating, which will cause drawing problems, the brush will produce a lot of broken shoulders, and the electronic components will encapsulate the broken shoulders and enter the electronic components, which will affect the assembly and use performance of the electronic components.

In the prior art, the side wall of the back-sealed bag is fixed with a hot rod, and then the plastic bag is formed by cold cutting, but in the actual use process, the heat-sealed plastic bag and the heat-sealed edge also need a cutting process. There are also drawing problems. Many bags increase the cooling process after heat sealing to prevent direct cutting after heat sealing, but there is a problem of increasing production costs. There are several problems with this comparison file:

1, hot rod area is large, more power consumption, increased production costs.

It needs to be cooled before the cutting process, or it needs a long interval between the cutting process and the heat sealing process.

3. If the bag has not been cooled, drawing problems may still occur after cutting, and the brush sticks to the tool, affecting subsequent processing.

4. If the bag has been cooled during cutting, the re-hardened PE film will be relatively hard, and the knife will increase the loss of the knife after cutting this hard PE film for a long time.

At the same time, in the aforementioned comparison document, the bag is equipped with a seal. In general, the seal is a buckle and a concave buckle that are engaged with each other. The technical characteristics of the buckle and the concave buckle will be disclosed in the application number "201220309407.9. Buckle and concave greatly increase the thickness of the sealing position of the PE film, because the hot rod is being carried out. Then the double-layer PE film is heated and sealed, but the melted buckle and the concave buckle are thick and need a lot of heat to corner. If the PE film is thin, the pressing amount of the hot rod knife will be greater. For example, the hot bar knife stops from the working surface pressing to the thickness of a layer of PE film. At this time, the concave and convex with a thickness 20 to 30 times higher than that of PE film are extruded to the thickness of PE film. In the case of heat-resistant film, it can be molded, but heat-resistant materials such as PE film are easy to burn.

Back Seal Bag In view of the disadvantages of the prior art, it is an object of the present invention to provide a strong, brushless magnetic bag. Preferably, an adhesion preventing portion is provided at the opening position of the chamber, the adhesion preventing portion comprises a plurality of bosses arranged in parallel, the bosses are respectively arranged at two sides of the opening, and the bosses extend to two sides of the chamber along the length of the opening.

As a proposal, a second anti-sticking part is provided on both sides of the buckle, and the second anti-sticking part is two convex parts extending along the length of the buckle. The length of the first hot-melt fixing part is 2cm, and the thickness of the hot-melt fixing part is 1.5 times of the thickness of the battery.

The above is the production process of the back seal bag, if you need to know more, please feel free to contact us!