A kind of preparation method of plastic packaging film

Abstract

The invention provides a preparation method of a plastic packaging film, belonging to the technical field of packaging films. Including the following steps: S1, the preparation of the multi-layer co-extrusion film, put each component into the multi-layer co-extrusion extruder for extrusion, S2, irradiation cross-linking, pulling the multi-layer co-extruded film obtained in the above steps Go to the electron irradiation equipment to carry out irradiation crosslinking; S3, coating, coating the surface of the prepared multi-layer co-extruded film with a shapeable photothermal dual-curing coating liquid to form a shapeable photothermal dual-curing coating; The shapeable photothermal dual-curing coating contains closed-cell buffer micro-bags, and the size of the closed-cell buffer micro-bags is 100-350um. According to the preparation method of the shapeable packaging film provided by the present invention, the surface of the conventional multi-layer co-extruded flexible packaging film is coated with a photothermal dual curing coating. , After UV light, it is shaped and increased in strength, and it can be wrapped flexibly and can be firmly supported and protected.

Description

Technical field: [0001] The invention relates to the technical field of packaging films, in particular to a preparation method of a shapeable packaging film. Background technique: [0002] In order to facilitate the transportation, handling and storage of products during the production and circulation process, packaging bags are usually used outside the products. Especially for some products with special shapes that need to be compressive and anti-collision, if ordinary compression-resistant buffer packaging boxes are used, they cannot be packaged flexibly, and there may be a large amount of free space in them, resulting in a waste of space; ordinary packaging films can be used. Flexible packaging, but ordinary packaging film is not strong enough to support and protect the product, and has poor cushioning performance. [0003] In addition, in order to increase the cushioning performance of the packaging film, a foaming agent can generally be added to the raw materials of th...

AI Technical Summary

Problems solved by technology

Especially for some products with special shapes that need to resist compression and collision, if ordinary compressive cushioning packaging boxes are used, flexible packaging cannot be achieved, and there may be a large empty space inside, resulting in waste of space; using ordinary packaging films can Flexible packaging, but the ordinary packaging film is not strong enough to support and protect the product, and has poor cushioning performance

[0003] In addition, in order to increase the cushioning performance of the packaging film, a foaming agent can generally be added to the raw material of the packaging film, but when the conventional foaming agent is used in the film material, it is easy to form a large number of open-cell bubbles, resulting in a significant decrease in the mechanical properties of the material. If thermal expansion is used As a closed-cell foam material, microspheres usually have poor solvent resistance. When used in coatings, they are often infiltrated and swelled by solvents, resulting in a decrease in foaming efficiency. The density of thermally expandable microspheres is low, and they are generally compatible with conventional resins. , when used in coatings, it is easy to float on the surface, resulting in a decrease in the mechanical properties of the coating surface

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