PE high-transparency shrinkable film and preparation method thereof

Abstract

The invention discloses a preparation method of a PE high-transparency shrinkable film. The preparation method comprises the following steps that metallocene polyethylene, high-density polyethylene HDPE, PET granules and processing aids are mixed to obtain a first raw material, the metallocene polyethylene, low-density polyethylene LDPE, polypropylene carbonate PPC and processing aids are mixed toobtain a second raw material, and the metallocene polyethylene, PET granules, poly butyleneadipate-co-terephthalate PBAT and processing aids are mixed to obtained a third raw material; the first rawmaterial is extruded by using a first process to obtain a first melt, the first melt is introduced into a first laminating device to obtain an outer layer film, wherein the outer layer film is provided with a first outer sublayer and a second outer sublayer; the second raw material is extruded by using a second process to obtain a second melt, wherein the second melt is used for forming an intermediate film layer; the third raw material is extruded by using a third process to obtain a third melt, wherein the third melt is used for forming an inner film layer; and the outer layer film, the second melt and the third melt are introduced into a laminating machine head, and the PE high-transparency shrinkable film is obtained through post-treatment.

Description

technical field [0001] The invention relates to the technical field of plastic processing, in particular to a PE highly transparent shrink film and a preparation method thereof. Background technique [0002] In the 1990s, my country gradually promoted the use of polyethylene (PE) packaging film to preserve food to replace the preservation of food in the cold chain of Western developed countries. PE has good heat-sealing properties. As a heat-sealing material, it can be quickly sealed during the production process. It is safe in contact with food, has high transparency, and has no adverse effects on the food inside. Therefore, it is widely used in the field of food packaging. At present, the PE shrink film used in the market has low strength and toughness, high haze, extremely low visibility to the packaging, and the surface is cloudy and unclean, making it impossible for consumers to distinguish the damaged state of the required items. Moreover, some shrink films are highly...

AI Technical Summary

Problems solved by technology

The PE shrink film currently used in the market has low strength and toughness, high haze, extremely low visibility to the packaging, and the surface is turbid and unclean, making it impossible for consumers to distinguish the damaged state of the required items.

Moreover, part of the shrink film is highly damaged during transportation, and it is easy to contaminate the packaging.

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