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Solution to uneven and poor symmetry of self-supporting packaging bag

click:191 time:2022-10-14 edit:Hua Di's editor

What should we do if the self-supporting packaging bag is uneven and has poor symmetry? Today, I will explain these problems to you. Let’s have a look.


Nowadays, the emergence of special-shaped bags and self-supporting bags has brought new economic growth highlights to the flexible packaging industry. Because they can bring endless business opportunities, many flexible packaging enterprises have introduced corresponding equipment and manufacturing technology to promote the rapid development of enterprises.


However, in daily production, there are also various production quality problems with self-supporting packaging bags. Today, we, Shenkai Packaging, will explain the reasons and treatment methods for the problems of uneven bag type and poor symmetry of self-supporting packaging bags.


1. Uneven bag type


As we all know, flatness is one of the indicators to measure the appearance quality of packaging bags. In addition to the material factor, the flatness of the self-supporting bag is also related to the heat sealing temperature, heat sealing pressure, heat sealing time, cooling effect and other factors. If the heat sealing temperature is too high, or the heat sealing pressure is too high, or the heat sealing time is too long, the composite film will shrink and deform. Insufficient cooling will lead to insufficient shaping after heat sealing, which cannot eliminate internal stress and wrinkle the bag. Therefore, adjust the process parameters and ensure that the cooling water circulating system works normally.


2. Poor symmetry


Symmetry not only affects the appearance of the self-supporting bag, but also affects its sealing performance. The common asymmetry of the self-supporting bag is often reflected in the bottom material. Due to improper control of the bottom material tension, the bottom hole will be deformed or wrinkles will occur due to the tension mismatch with the main material, and the heat sealing strength will be reduced. When the bottom material round hole is deformed, the discharge tension shall be appropriately reduced, and the waiting time shall be increased during heat sealing for correction, so as to fully heat seal the intersection of the four layers at the bottom of the bag. In addition, bag asymmetry is also related to photoelectric tracking, feeding, cursor design, rubber roller balance, synchronization of stepping motor or servo motor and other factors. This problem should be solved according to the specific operation of different products and bag making equipment.


The above is about the solution of uneven bag shape and poor symmetry of self-supporting bags. Have you learned? I hope it will be helpful to everyone.


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