Stretchable composite aluminum foil material and cold forming technology thereof

Abstract

The invention belongs to the field of composite aluminum foil materials and in particular relates to a stretchable composite aluminum foil material and a cold forming technology thereof. The composite aluminum foil material sequentially comprises the following structures from outside to inside: a PE layer with the thickness of 26-32mu m, a PA layer with the thickness of 12-25mu m, an aluminum foil with the thickness of 7-13 mu m and a PP layer with the thickness of 20-25 mu m, wherein the layers are bonded together by virtue of a binder; and film rolling moulding is carried out by virtue of a mould and a compressed air cold moulding method. The obtained composite aluminum foil material is easy to stretch, resistant to stamping, resistant to puncture, strong in barrier property, antioxidant, waterproof and good in fragrance protectiveness and heat resistance, can be used for high temperature steaming and is high in flexibility and good in heat sealability; and a unique cold moulding technology of the stretchable composite aluminum foil material avoids the phenomena that the traditional thermal forming way enables a packaging film material to be easily burst, folded and retracted and not beautiful in appearance after being heated and cooled and shelf life of a product is influenced due to crack.

Description

technical field [0001] The invention belongs to the field of composite aluminum foil materials, and in particular relates to a stretchable composite aluminum foil material and a cold forming process thereof. Background technique [0002] Aluminum foil generally refers to an aluminum material with a purity of more than 99.5% and a thickness of less than 0.2mm. It has light weight, strong shading, good insulation, good shape stability at high and low temperatures, soft texture, good ductility, and easy processing. Advantages, it is one of the most commonly used materials in modern packaging. However, aluminum foil is easy to form pinholes or wrinkles during packaging and use, thereby reducing its barrier performance. Therefore, aluminum foil is usually used in composite materials made of paper, polymers, or other metal sheets. Aluminum foil composite materials not only have good barrier properties, but also have good mechanical strength and mechanical properties. They are sui...

AI Technical Summary

Problems solved by technology

[0003] However, the forming method of conventional composite aluminum foil materials often adopts the traditional thermoforming method, and this forming method will cause the packaging film material to be easily cracked, wrinkled and retracted after heating and cooling, and the packaging will not be beautiful, and the shelf life of the product will be affected due to cracking, etc. Phenomenon