[Chinese Packaging Network News] Regardless of the cost of packaging, or any aspect of performance requirements, the choice of the thickness of each layer of composite flexible packaging materials should be carefully weighed.
In general, the heat seal layer can be determined by market generalization and standardization. The strength support layer is generally determined according to the weight of the packaged product, and the thickness of the functional material is generally determined by the shelf life of the product. The method for theoretically determining the thickness of flexible packaging composites is described in this paper.
1. Determined according to the maximum allowable water absorption or maximum allowable dehydration of the packaged product
This method is mainly suitable for moisture-proof packaging design of products, and its key is to calculate the moisture permeability coefficient of the flexible packaging composite materials.
2. Determined according to the maximum allowable oxygen absorption of the packaged product
This method is mainly suitable for barrier packaging of products that are very sensitive to oxygen. The key is to calculate the oxygen permeability coefficient of flexible packaging composites.
3. Determine the maximum allowable number of microorganisms per unit volume or surface area
This method is mainly suitable for mildew-proof packaging of products that are very sensitive to microorganisms. The key is to determine the type of product microorganisms and the law of their reproduction and growth.
4. Determined according to the maximum amount of permeated carbon dioxide or oxygen permeability allowed in the packaging container
This method is mainly aimed at the product of inflatable insurance packaging, with the declaration of active products need oxygen insurance or maintain a bright color, but also need high concentrations of carbon dioxide to inhibit microbial growth and reproduction, the key is to calculate the oxygen permeability coefficient of flexible packaging composite materials and Permeation coefficient of carbon dioxide.
When packaging products, sometimes it is necessary to achieve the purpose of moisture-proof packaging, but also to achieve the purpose of oxygen-resistant packaging or anti-mildew packaging. Therefore, the thickness of the composite packaging material is generally determined based on the main packaging purpose of the product packaging and the shelf life of the product. The theoretical shelf life of the designed packaging is estimated based on the thickness of the material and another packaging purpose to verify the rationality of the design packaging. .
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