How to determine the thickness of each layer of a composite packaging bag? Here's a little trick!

Considering both packaging costs and performance requirements, the thickness selection of each layer of composite packaging bags should be carefully weighed. Generally speaking, the heat-sealing layer can be determined through 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.

Shunxingyuan Packaging, a professional flexible packaging manufacturer, believes that there are several theoretical methods to determine the thickness of each layer of composite packaging bags.

1. Permeability coefficient

It is determined according to the maximum allowable water absorption or maximum allowable dehydration of the packaged product. This method is mainly suitable for the moisture-proof packaging design of products, and the key is to calculate the water vapor transmission rate of the flexible packaging composite material.

2. Oxygen permeability coefficient

It is determined according to the maximum allowable oxygen absorption of the packaged product. This method is mainly suitable for the barrier packaging of products that are very sensitive to oxygen, and the key is to calculate the oxygen permeability coefficient of the flexible packaging composite material.

3. Number of microorganisms

It is determined according to the maximum allowable number of microorganisms per unit volume or unit surface area. This method is mainly suitable for mildew-proof packaging of products that are very sensitive to microorganisms, and the key is to determine the types of microorganisms in the product and their growth and reproduction patterns.

4. Oxygen permeability coefficient and carbon dioxide permeability coefficient

It is determined according to the maximum allowable amount of carbon dioxide or oxygen permeability of the packaging container. This method is mainly aimed at the gas-filled insurance packaging of products. Products with declared activity require both oxygen insurance or maintaining bright colors and high concentrations of carbon dioxide to inhibit the growth and reproduction of microorganisms. 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 moisture-proof and oxygen-blocking or mildew-proof purposes. Therefore, the thickness of each layer of the composite packaging bag is generally determined first based on the main packaging purpose and shelf life of the product, and then the theoretical shelf life of the designed packaging is estimated according to the thickness of the material and another packaging purpose to verify the rationality of the designed packaging.

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