To ensure the tightness of the vacuum packaging bag, in addition to paying attention to the material selection during the production of the vacuum packaging bag, the heat sealing of the vacuum packaging bag must also be strictly controlled to ensure the quality of the vacuum packaging bag. When vacuum packaging bags are heat sealed, improper operations or other factors often lead to various bag-making quality problems:
First, the heat-sealed area of the vacuum packaging bag is fragile after heat-sealing. This bag-making quality failure may be due to excessive heat sealing pressure, too high heat sealing temperature or too long heat sealing time, poor film substrate strength, uncooled heat sealing line force, low heat sealing temperature or excessive heat sealing pressure Caused by low-level reasons. Therefore, when selecting materials for vacuum packaging bags, high-strength film substrates should be considered, and the heat-sealing pressure, heat-sealing temperature, and heat-sealing time should be adjusted appropriately when heat-sealing.
Second, the vacuum packaging bag has poor heat sealing or low heat sealing strength after heat sealing. Generally, excessive corona treatment during heat sealing, insufficient strength or uneven thickness of the film base material, improper selection of film material, inappropriate heat sealing parameters (heat sealing temperature, heat sealing pressure, heat sealing time), etc. may cause The above problem. Therefore, in addition to selecting suitable packaging film substrates according to different types of packaging products and ensuring the strength of the film and appropriately adjusting the heat sealing parameters, attention should also be paid to the corona treatment strength during heat sealing.
Third, the uneven heat sealing of the vacuum packaging bag after heat sealing is mainly caused by factors such as uncoordinated heat sealing temperature control and uneven heat sealing pressure. Therefore, it is necessary to control the temperature of the heat-sealing equipment and the heat-sealing pressure to be uniform during the production of vacuum packaging bags.
