What factors determine the thickness of the stretch film
Stretch film is most widely used in the logistics industry, mainly used to package a variety of goods, think from two aspects about the packaging costs and performance requirements, we should be carefully ponder on how to choose the thickness of the stretch. In general, the thickness of the stretched film can be determined by generalization and standardization of the market. The strength support is generally determined by the weight of the packaged product, and the functional stretched films thickness is generally determined by the shelf life of the product. So what factors determine the thickness of the stretch film? Here to introduce:
1, according to the unit volume or unit surface area of the maximum allowable number of microorganisms to determine, the method is mainly suitable for mildew proof packaging which was very sensitive to microbial, the key is to determine the type of microbial in the products and the rule of its growth and reproduction.
2. According to the maximum allowable water absorption or the maximum allowable dewatering capacity of the product, the method mainly adapts to the design for moisture-proof packaging. The key is used to calculate the moisture permeability coefficient of the stretched film.
3, according to the maximum allowable oxygen absorption of packaged products to determine the method is mainly suitable for products is very sensitive to oxygen products barrier packaging, the key is to calculate the stretch film oxygen permeability coefficient.
4, according to the maximum allowable permeation of carbon dioxide or oxygen permeability to determine the method, the method is mainly for the product of inflatable packaging, a active products is need oxygen insurance and maintain a bright color, but also need high concentrations of carbon dioxide to Inhibited microbial growth and reproduction, the key is to calculate the stretch film oxygen permeability coefficient and carbon dioxide coefficient.