How to check whether the aluminum foil bag is qualified?

In some cooked food packaging, we often use aluminum foil bags, aluminum foil bags as special bags, in its production process, there are strict technical indicators, if not in accordance with the standard process production, it is likely to produce a batch of defective products, then how should we judge the quality of aluminum foil bags? Next, please ask the technical experts of aluminum foil bag manufacturers to introduce some knowledge in this respect to us.

1, adhesive - adhesive is a special substance containing solvents, it is coated on the dark side of the original aluminum foil under certain process conditions, after drying to form a bonding layer, the product's heat sealing strength plays a decisive role, so in the selection of aluminum foil bag adhesive, we must pay attention to the choice of quality reliable manufacturers.

2, raw and auxiliary materials - the original aluminum foil is the carrier of the bonding layer, and its quality has a deep impact on the heat sealing strength of the product. On the one hand, the surface of the original aluminum foil is greasy, which will weaken the adhesion between the adhesive and the original aluminum foil. On the other hand, the heat sealing strength is also affected by the metal composition of the original aluminum foil and the insufficient surface luminosity. Therefore, the quality of the original aluminum foil must be strictly good.

3, heat sealing temperature - heat sealing temperature is an important factor affecting the strength of heat sealing. If the temperature is too high, the bond between the adhesive layer and the pvc film is not strong. If the temperature is too high, the medicine will be affected. Therefore, the reasonable heat sealing temperature is generally between 150 ° C and 160 ° C.

4, the production process - under the control of certain process parameters, the adhesive is coated on the surface of the original aluminum foil to form a film, and the quality of the film will directly affect the heat sealing strength of the product. The more important parameter is the coating speed. If the coating speed is too fast and the drying temperature is too high, the solvent on the surface of the coating film will evaporate too quickly, resulting in the residual solvent in the film, and the drying of the coating film is not sufficient, which will affect the heat sealing strength of the product.