In some cooked food packaging, we often use aluminum foil bags, aluminum foil bags as special packaging bags, in the production process, there are strict technical indicators, if in accordance with the standard process production, it is likely to produce a batch of defective products, then how should we judge the product quality of aluminum foil bags? Next, let's invite the technical experts of aluminum foil bag manufacturers to introduce some knowledge in this respect.
1. In terms of adhesive - adhesive is a special substance containing solvent. It is coated on the dark side of the original aluminum foil under certain process conditions, forms the adhesive layer after drying in the drying path, which plays a decisive role in the heat sealing strength of the product. Therefore, when selecting the adhesive for aluminum foil bag, it is necessary to pay attention to the manufacturer with reliable quality.
2. In terms of raw auxiliary materials, the original aluminum foil is the carrier of the bonding layer, its quality has a deep impact on the heat sealing strength of the product. On the one hand, the oil stain on the surface of the original aluminum foil will weaken the adhesion between the adhesive the original aluminum foil. On the other hand, the heat sealing strength is also affected by the insufficient metal composition surface luminosity of the original aluminum foil. Therefore, the quality of the original aluminum foil must be strictly controlled.
3. Heat seal temperature -- heat seal temperature is an important factor affecting heat seal strength. If the temperature is too high, the adhesion between the adhesive layer PVC film is firm. If the temperature is too high, the medicine will be affected. Therefore, the reasonable heat sealing temperature is generally 150 ℃ ~ 160 ℃.
4. In terms of 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, the quality of the film will directly affect the heat sealing strength of the product. One of the more important parameters such as coating speed. If the coating speed is too fast the drying temperature is too high, the solvent on the surface of the film will volatilize too fast, resulting in the residual solvent in the film, the drying of the film is sufficient, which will affect the heat sealing strength of the product.