As we all know, for aluminum foil bags, poor sealing is a very serious quality problem, which will not only affect product quality and use, but also make enterprises question the production process level of the manufacturer. In production, poor sealing can be divided into incomplete hot sealing, brittle sealing, bag warping after hot air and other problems.
If the heat seal is not completely caused by the leakage or deterioration of the packaging products of the packaging bag, it is mainly due to the insufficient anti-pollution heat seal performance of the composite film during production, so the film substrate with good anti-pollution heat seal performance can be used, such as LDPE film. And when the aluminum foil bag is sealed brittle or even brittle, what is the cause?
In fact, the heat sealing temperature is too high, the heat sealing pressure is too large, the heat sealing time is too long, or in the composite curing process, the adhesive penetrates into the film resulting in its toughness is reduced, brittleness is increased, etc., are the possible factors that cause the finished product sealing brittle and brittle break. As long as we adjust the heat sealing temperature and excitation time according to the heat sealing characteristics of the material, ensure the state of the heat sealing equipment, and pay attention to the penetration problem of the adhesive in the composite curing, such problems can be avoided in the finished product.
In addition, when the manufacturer is producing aluminum foil bags, the phenomenon of warping after heat sealing is mainly due to the uneven thickness of the composite film, the high heat sealing temperature or too long time, the cooling after heat sealing is not full, the curing time is not enough, and the poor heat resistance of the film substrate. What needs to be done is to choose a film substrate with good heat resistance, and control the temperature and duration of the hot sealing according to the material properties of the selected material, and adjust the tension of the floating roll before the hot sealing to ensure adequate ripening and sufficient cooling.
