Composite polyethylene film containing chitosan and production method of composite polyethylene film

Abstract

The invention relates to the field of packaging materials, in particular to a composite polyethylene film containing chitosan and a production method of the composite polyethylene film. The compositepolyethylene film is characterized in that each of the corona layer and the middle layer of the composite polyethylene film is the co-mixture of linear low-density polyethylene, low-density polyethylene and processing aid, the inner layer of the composite polyethylene film is a co-mixture formed by, by mass percentage, 26-48% of metallocene linear low-density polyethylene, 40-62% of linear low-density polyethylene, 9-17% of low-density polyethylene, 2-3% of modified chitosan powder, 0.03-0.1% of slip agent, 0.1-0.5% of inorganic anti-sticking agent, 0.3-1% of talcum powder master batch and 0.3-1% of processing auxiliaries, and submicroscopic composition is formed between the adhering faces of optional two of the corona layer, the middle layer and the inner layer of the composite polyethylene film. The composite polyethylene film is good in antibacterial ability, high in tensile strength, high in elongation at break, high in heat sealing strength, excellent in impact resistance and suitable for being used as double-edge and three-edge packages or box sealing film layers.

Description

Technical field [0001] The invention relates to the field of packaging materials, and in particular to a composite polyethylene film containing chitosan and a manufacturing method thereof. Background technique [0002] In some preservation technologies that need to ensure the freshness of the contents, it is often necessary to seal the sealed packaging with boiling or steam heat sterilization, such as ordinary or modified atmosphere packaging food packaging boxes, bilateral packaging of facial masks, The three-side sealed packaging bags are heat sterilized to maintain the commercial sterility of the contents. Generally, during the thermal sterilization process, it is necessary to avoid the deformation of the film caused by thermal expansion of the packaging contents, and it is necessary to ensure that the film itself and the packaging box body of other materials, as well as the joint surface between the two film bodies, maintain sufficient adhesion. The sealing strength is ...

AI Technical Summary

Problems solved by technology

[0003] In addition, due to the rich nutrients in food or facial masks, under improper storage conditions, the contents have potential microbial growth, resulting in the risk of spoilage of the contents. The use of antibacterial materials can help reduce such risks, such as the use of chitosan Sugar is used as a biological antibacterial material to improve its antibacterial ability; chitosan is used to enhance the antibacterial ability of polyethylene film, which is usually achieved by coating chitosan solution on polyethylene film. And the specifications have high requirements. In order to meet the coating fastness, it is usually coated on the corona treated surface of the polyethylene film. Because the coated chitosan layer is in the middle of the two films, the composite film as a whole cannot play a very good role. good antibacterial effect

Moreover, the composite film prepared by this method has relatively large limitations in heat resistance and heat sealing performance, and is not suitable for sealing bags, boiling water or steam heat sterilization as airtight packaging, and can only meet simple packaging of single-layer fruits and vegetables. , complex composite structure packaging cannot be well realized

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