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      Hello, welcome to Lianyungang Weihua Packaging Co., Ltd!  National Sales Hotline:13851287315

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      Lianyungang Weihua Packaging Co., Ltd

      Contact: Manager Wang

      Operator: 0518-85306315

      Mobile: 13851287315

      Email: 13851287315@163.com

      Address: No..16, Changwei Road, Dapu Industrial Zone, Lianyungang Economic Technological Development Zone

      Why does the vacuum bag fold?

      2019-12-26 17:40:29

      As a vacuum bag manufacturer, today Xiaobian will come to talk with you about why there are wrinkles in the vacuum bag.

      Vacuum bag is to maintain a relatively high degree of pressure reduction in the bag. Vacuum bag is to extract all the air in the package seal it. Less air is equivalent to the effect of low oxygen, so that there is no living condition for the object, so as to achieve the purpose of fresh-keeping reducing the growth of bacteria. The common vacuum bag is easy to appear dead angle when vacuumizing, which results in incomplete vacuumizing can't extend the shelf life of food very well. However, the vacuum bag with lines in our home packaging can form a microchannel when vacuumizing, which is relatively complete, thus achieving the effect of effectively extending the shelf life of food.

      Sometimes, the packaging bag of vacuum high temperature cooking has the problem of wrinkles. The thickness of the base material is uneven, the difference between the thickness is too large. The qualified film needs to be replaced. Base material unwinding deflection. It is necessary to adjust the position of the film so that it does deviate during transmission. When the amount of glue is too much enough, it is easy to slide between layers, uneven glue application will also cause local wrinkles. At this time, it is necessary to adjust the glue application amount evenly apply the glue.

      Insufficient drying of adhesive will also lead to such problems as too much residual solvent, small adhesion displacement of two composite substrates. In this case, it is necessary to adjust the process parameters so that the adhesive can be fully dried to reduce the solvent residue. Without cooling insufficient cooling, the composite film can be rolled up directly, the high temperature soft composite film is easy to wrinkle. The composite membrane needs to be fully cooled before rewinding. The combined pressure is set properly. In this case, adjust the composite pressure. Improper control of warp force causes uncoordinated tension of unwinding winding. Adjust the tension of unwinding rewinding to make the tension match each other. The guide rollers are parallel. The solution is to adjust the parallelism of each guide roller.



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