From the perspectives of packaging cost and performance requirements, the
selection of thickness for each layer of composite packaging bags should be
carefully balanced. Generally speaking, the heat sealing layer can be determined
through market generalization and standardization, the strength support layer is
generally determined based on the weight of the packaged product, and the
thickness of functional materials is generally determined by the shelf life of
the product.
1. Based on the maximum allowable water absorption or maximum allowable
dehydration of the packaged product, this method is mainly suitable for
moisture-proof packaging design of the product, and the key is to calculate the
oxygen permeability coefficient of the composite packaging bag.
2. Based on 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 the composite packaging bag.
3. Based on the maximum allowable number of microorganisms per unit volume or
surface area, this method is mainly suitable for anti mold packaging products
that are highly sensitive to microorganisms. The key is to confirm the types of
microorganisms in the product and their reproductive and growth patterns.
4. Based on the maximum allowable carbon dioxide or oxygen permeability of
the packaging container, this method is mainly aimed at inflatable safety
packaging of products. Products with declared activity require oxygen safety or
maintain bright colors, as well as high concentrations of carbon dioxide to
inhibit microbial growth and reproduction. The key is to calculate the oxygen
permeability coefficient and carbon dioxide permeability coefficient of
composite packaging bags.
When packaging products, sometimes it is necessary to achieve both
moisture-proof packaging and oxygen resistant or mold resistant packaging.
Therefore, generally, the thickness of each layer of composite packaging bag is
determined based on the main packaging purpose and shelf life of the product
packaging, and then 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 designed packaging.
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