How to confirm the thickness of each layer of the composite packaging bag? Here are the tips!

Considering the two aspects of packaging cost and functional requirements, the thickness selection of each layer of the composite packaging bag needs to be carefully weighed. Generally speaking, the heat sealing layer can be confirmed by the generalization and standardization of the market, the strength support layer is generally confirmed according to the weight of the packaged product, and the thickness of the functional material is usually confirmed by the shelf life of the product. Professional flexible packaging manufacturers believe that there are the following aspects to theoretically determine the thickness of each layer of the composite packaging bag. 1. The permeability coefficient is confirmed according to the maximum allowable water absorption of the packaged product or the maximum allowable dehydration of the product. This method is mainly adapted to the moisture-proof packaging design of the product. The key is to calculate the moisture permeability coefficient of the flexible packaging composite material. 2. The oxygen permeability coefficient is confirmed according to the maximum allowable oxygen absorption of the packaged product. This method is mainly suitable for product barrier packaging where the product is very sensitive to oxygen. The key is to calculate the oxygen permeability coefficient of the flexible packaging composite material. 3. The number of microorganisms is confirmed according to the maximum allowable number of microorganisms per unit volume or unit surface area. This method is mainly adapted to the mold-proof packaging of products that are very active to microorganisms. The key is to confirm the types of microorganisms in the product and the rules for their reproduction. 4. The oxygen permeability coefficient and carbon dioxide permeability coefficient are confirmed according to the maximum carbon dioxide permeability or oxygen permeability allowed by the packaging container. This method is mainly aimed at the inflatable and safe packaging of the product. Products with declared activity require oxygen stability or maintain a beautiful color and luster. A high concentration of carbon dioxide is required to restrain the growth and reproduction of microorganisms, and the key is to calculate the oxygen permeability coefficient and carbon dioxide permeability coefficient of the flexible packaging composite material. When packaging products, sometimes it is necessary to achieve both the purpose of moisture-proof and the purpose of preventing oxygen or mildew. Therefore, the thickness of each layer of the composite packaging bag is generally recognized based on a certain primary packaging intention of the product packaging and the shelf life of the product, and then the theoretical shelf life of the planned packaging according to the thickness of the material and another packaging intention budget is used to verify the planned packaging. rationality.
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