Aluminum foil meal boxes are generally between 0.04mm-0.0mm and can be divided into wrinkle free and 20 thick wrinkles. Generally, 8011 aluminum alloy or 3003 aluminum alloy is used.
Aluminum foil lunch boxes have good barrier properties. When the thickness of the aluminum foil lunch box is sufficient, it can basically completely block gas and moisture. Therefore, aluminum foil lunch boxes are commonly used barrier materials in plastic flexible packaging materials, with advantages such as light weight, good airtightness, and easy packaging. Good report, etc. Mainly for hygiene and aesthetics, as well as keeping warm. This product can be placed directly on a gas or microwave oven without worrying about danger. Aluminum foil lunch boxes can withstand high temperature changes. From the refrigerator to the oven, from the refrigerator to the oven to the dining table, everything is possible.
So what is the specific temperature for the heat sealing of aluminum foil lunch boxes? What are the requirements for sealing temperature?
During the production process, under certain process parameter control, the adhesive is coated on the surface of the aluminum foil lunch box to form a film. The quality of the film directly affects the heat sealing strength of the product. Among them, the more important parameters include coating speed, cross-sectional temperature of drying path, shape, depth and number of lines of coating roller, as well as position and angle of scraper. The coating speed determines the drying time of the coating in the drying tunnel. If the coating speed develops too fast and the baking temperature is too high, the solvent on the coating surface will evaporate too quickly, resulting in residual organic solvents in the coating and insufficient drying of the coating, leading to drying of the coating. It is difficult to form a dry and strong adhesive layer. Affects the heat sealing strength of the product, leading to interlayer adhesion.
The shape, depth, number of lines, and position and angle of the scraper determine the thickness and uniformity of the coating. If selected or adjusted improperly, the adhesive cannot be evenly applied to the surface of the original aluminum foil lunch box, resulting in uneven film formation, poor heat sealing effect of the product, and affected strength.
The heat sealing temperature is an important factor affecting the strength of the heat sealing. If the temperature is too low, the adhesive layer and PVC film cannot dissipate heat well, and the adhesion between the adhesive layer and PVC film is not strong. Excessive temperature can affect sealing performance. Therefore, a reasonable heat sealing temperature is usually between 160 and 180.
In order to achieve the ideal heat sealing pressure, it is necessary to set a certain heat sealing pressure. If the pressure is insufficient, not only will the plastic layer of the product not fully adhere to the PVC film, but there will also be residual bubbles between the plastic layer and the PVC film, which cannot achieve good thermal bonding effect. Therefore, the standard specifies a heat sealing pressure of 0.20pa
The heat sealing time of aluminum foil meal boxes can also affect the heat sealing strength of the product. Usually, under the same heat sealing temperature and pressure, the longer the heat sealing time of aluminum foil meal box bags for drug packaging, the stronger and more complete the heat sealing area, which can better achieve the expected heat sealing strength. If the heat sealing time is not too short, the heat sealing between the adhesive layer and the PVC film material will be insufficient. So the standard stipulates that the scientific heat sealing time is 1 second.
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