Sealing method and thickness selection of food packaging bags
Food packaging bags can help food prolong the shelf life, and the shelf life achieved by some different materials is not the same. Aluminum foil bags are common in food packaging, and their use must meet certain sealing requirements, which also ensures the airtightness of the aluminum foil bags. A common and stricter sealing method is heat sealing.
The heat sealing method is a method of fusing two layers of aluminum foil together. This fusion is to combine the two layers of aluminum foil into one layer without cracking or breaking, and at the same time there will be no leakage. Sealing requirements.
Aluminum foil packaging bags have many specifications, not only in different sizes, but also in thickness, which also makes it meet a standard of packaging requirements. For different product packaging, the thickness of the packaging bag used is determined by the packaging properties of the product. For products with strict vacuum requirements, the thickness of the material used is larger. The greater the thickness of the aluminum foil packaging bag, the tighter the performance of the packaging and the more it can meet the packaging requirements. It's just that the packaging cost will be higher, because the material cost of packaging is calculated based on quality.
Food packaging bags are not just made of aluminum foil, but made of composite materials. This composite material is made of aluminum foil and nylon, and some are made of four-layer co-extruded film. For food, it is often a multi-layer composite material.
The reason for using multi-layer composite materials is to package food and maintain the quality of food. The other is that rich colors and patterns can be printed on food packaging bags, which is also a way for food to be recognized by the market. Necessary means of publicity.
Composite packaging bags (films) are designed to meet the needs of different products, so two or more films or materials with different properties must be combined to learn from each other to meet the packaging requirements.
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