Special food packaging and fresh-keeping film for high speed machine, and making method thereof

Abstract

The invention discloses a special food packaging and fresh-keeping film for a high speed machine, and a making method thereof. The film is formed by coextruding, by mass, 10-20% of an inner layer material, 50-70% of a middle layer material and 10-20% of an outer layer material. Raw materials of the inner layer material, the outer layer material and the middle layer material are respectively placed in three mixing reaction kettles, and are uniformly stirred, the stirred raw materials undergo heating extrusion through extrusion screws to form a melt state, and the molten upper layer material, the molten middle layer material and the molten lower layer material are respectively extruded into the inner chamber, the middle chamber and the outer chamber of a die head; and the upper ends of the molten materials in the die head are clamped and upward stretched by clamping and stretching devices on the upper end of the die head to stick the inner, middle and outer layer materials together in order to form the fresh-keeping film. The fresh-keeping film produced in the invention has good autoadhesion and high stretching performance, is a plasticizer-free polyolefin (PO) fresh-keeping film, is suitable for high-speed food packaging processing, and meets high stretchability, high strength and high toughness required by the high speed machine.

Description

technical field [0001] The invention relates to the technical field of packaging materials, in particular to a special fresh-keeping film for packaging food used in high-speed machines and a preparation method thereof. Background technique [0002] Food cling film is a kind of plastic product, which is widely used in food processing, packaging and other fields. Preservative film is favored by people for its convenience, economy and attractive appearance. [0003] According to the different materials used and the addition of plasticizers, there are mainly two types of plastic wrap: polyethylene (PE) plastic wrap without plasticizers meets food safety requirements in terms of material safety, and is self-adhesive and stretchable. In terms of performance, it is difficult to meet the requirements of the high-speed food packaging machine for these two aspects, which often causes the film to stop. Compared with polyethylene (PE) cling film, although polyvinyl chloride PVC cling ...

AI Technical Summary

Problems solved by technology

[0003] According to the different materials used and the addition of plasticizers, there are mainly two types of plastic wrap: polyethylene (PE) plastic wrap without plasticizers meets food safety requirements in terms of material safety, and is self-adhesive and stretchable. In terms of performance, it is difficult to meet the requirements of high-speed food packaging machines for these two aspects, often causing film breakage and shutdown

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