Today, the sudden emergence of special-shaped bags and stand up bags has brought new economic growth highlights to the flexible packaging industry. Because they can bring endless business opportunities, many flexible packaging companies have introduced corresponding equipment and production technology in order to promote the rapid development of enterprises.
However, in daily production, various production quality problems will also occur in self-supporting packaging bags. Today, we, Shenkai Packaging, will explain to you the reasons and solutions for self-supporting packaging bags when they encounter problems of uneven bag shape and poor symmetry. method.
The stand up pouch is uneven
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 stand up 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 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 result in insufficient shaping after heat sealing, which cannot eliminate internal stress and cause wrinkles in the bag. Therefore, the process parameters should be adjusted and the cooling water circulation system should work properly.
Poor symmetry of stand up pouch
Symmetry not only affects the appearance of the stand up pouch, but also affects its sealing performance. The common asymmetry of stand-up pouches is often reflected in the bottom material part. Due to improper control of the tension of the bottom material, the round hole on the bottom surface will be deformed or wrinkles will be generated due to the tension mismatch with the main material, and the heat sealing strength will be reduced.
When the round hole of the bottom material is deformed, it is necessary to properly reduce the tension of the discharge, and increase the waiting time for correction during heat sealing, so that the intersection of the four layers at the bottom of the bag can be fully heat-sealed. In addition, the asymmetry of the bag shape will also be related to factors such as photoelectric tracking, feeding, cursor design, rubber roller balance, stepper motor or servo motor synchronization. This problem should be solved according to the specific operation of different products and different bag making equipment.
