Why do vacuum bags wrinkle?

As a vacuum bag manufacturer, today Xiaobian will come and talk to you about why the vacuum bag wrinkles.

The vacuum bag is to maintain a relatively high level of decompression inside the bag, the vacuum bag is to extract all the air in the package and seal, the less air is equivalent to the effect of low oxygen, so that there is no survival conditions, so as to achieve the purpose of preservation and reduce the growth of bacteria. Ordinary vacuum bags are prone to dead corners when vacuuming, resulting in incomplete vacuuming, which cannot extend the shelf life of food well, and our home and the vacuum bag with grain packaging pressure can form micro-channels when vacuuming, and vacuuming is relatively complete, thus achieving the effect of effectively extending the shelf life of food.

Sometimes there is a problem of wrinkles in the vacuum high temperature cooking bag. The thickness of the substrate is not uniform, and the difference in thickness is too large. A quality film needs to be replaced. Substrate unwinding skew. The position of the film needs to be adjusted so that it does not skew during transfer. When the amount of glue is too much or not enough, it is easy to slip between layers, and uneven glue application will also cause local wrinkles. At this time, it is necessary to adjust the amount of glue and evenly apply glue.

Insufficient drying of the adhesive will also lead to such problems, too much residual solvent, small adhesion, and displacement of the two substrates after composite. In this case, it is necessary to adjust the process parameters so that the adhesive can be fully dried to reduce the residue of the solvent. The composite film is directly rolled without cooling or insufficient cooling, and the high temperature and soft composite film is easy to wrinkle. The composite film needs to be sufficiently cooled before being rewound. Compound pressure is not set properly. In this case, the compound pressure should be adjusted. Improper control of the warp force makes the tension of the winding uncoordinated. Adjust the tension between unwinding and unwinding so that the tension matches each other. The guide rollers are not parallel. The solution is to adjust the parallelism of each guide roller.