Black and white preservative film composite package

Abstract

The invention discloses a black and white preservative film composite package which is formed by connecting a composite surface layer, a middle composite layer and a heat-seal layer by an adhesive in a dry type composite process; the composite surface layer is a nylon film, the middle composite layer is an aluminum foil and the heat-seal layer is a black and white PE film; the black and white PE film is formed by co-extruding an external layer, a middle layer and an internal layer by a blow molding machine; the internal layer is formed by mixing metallocene low-density polyethylene as the substrate, linear low-density polyethylene, a black master stock and an anti-blocking agent with the ratio of 4: 3: 2.5: 0.5; the middle layer and the external layer are formed by mixing linear low-density polyethylene, high-density polyethylene and a white master stock with the ratio of 4: 4: 2; the extruding speeds of the internal layer, the middle layer and the external layer respectively are 30%: 40%: 30%. The black and white preservative film composite package has heat-seal performance and unique barrier functions for light and oxygen, is beneficial to storage and transportation and relatively low in price, is mainly used as fresh milk packages to satisfy clients' requirements, is capable of greatly reducing cost of products package on the basis of prolonging guarantee period and conforms to the environmental protection requirement.

Description

technical field [0001] The invention relates to a composite packaging of fresh-keeping film, in particular to a composite packaging of black and white fresh-keeping film. Background technique [0002] At present, the fresh-keeping film composite packaging products on the market have a short fresh-keeping shelf life, soft hand feeling, and general covering performance. The finished packaging bag is not flat, soft but not hard, and too transparent, so it is easy to see the packaging. contents. As people's requirements for the freshness of packaged food are getting higher and higher, this requires packaging bags to increase the preservation time and make the shelf life longer. Therefore, the requirements for the stiffness, barrier performance, covering performance and unique performance of packaging bags are getting higher and higher, which requires a new production process of plastic wrap composite packaging. Contents of the invention [0003] The purpose of the present in...

AI Technical Summary

Problems solved by technology

[0002] At present, the fresh-keeping film composite packaging products on the market have a short fresh-keeping shelf life, soft hand feeling, and general covering performance. The finished packaging bag is not flat, soft but not hard, and too transparent, so it is easy to see the packaging. contents