How to deal with uneven symmetry of reusable pouches
Release time:
2022-05-25
In daily production, reusable pouches will also have various production quality problems. Today, we will explain to you the reasons and solutions when reusable pouches encounter the problem of uneven bag shape and poor symmetry.
In daily production, reusable pouches will also have various production quality problems. Today, we will explain to you the reasons and solutions when reusable pouches encounter the problem of uneven bag shape and poor symmetry.
1. The bag is not flat
As we all know, flatness is one of the indicators to measure the appearance quality of packaging bags. In addition to material factors, the flatness of reusable pouches is also related to factors such as heat sealing temperature, heat sealing pressure, heat sealing time and cooling effect. If the heat sealing temperature is too high, 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 result in insufficient setting after heat sealing, internal stress cannot be eliminated, and the bag will be wrinkled. Therefore, the process parameters should be adjusted and the cooling water circulation system should work normally.
2. Poor symmetry
Symmetry affects not only the appearance of reusable pouches, but also their sealing properties. The common asymmetry of reusable pouches is often reflected in the bottom material. Due to improper control of the bottom material tension, the bottom surface will be deformed or wrinkles will be generated due to the mismatch with the main material tension, and the heat sealing strength will be reduced. When the round hole of the bottom material is deformed, the tension of the discharge should be appropriately reduced, and the waiting time should be increased to make corrections during heat sealing, so that the four-layer intersection of the bottom of the bag can be fully heat-sealed. In addition, the asymmetry of the bag shape is also related to factors such as photoelectric tracking, feeding, cursor design, rubber roller balance, and synchronization of stepper motors or servo motors. This problem should be solved according to the specific operation of different products and different bag making equipment.
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