Co-extrusion frosted film and preparation method of frosted film

By using transparent matte masterbatch with specific particle size and microsphere foaming agent in co-extruded frosted films, combined with gradient cooling technology, the problem of frosted texture and optical performance in complex structures of multilayer co-extruded films has been solved, achieving a stable and uniform frosted effect and low light transmittance, thus improving the overall performance of the film.

CN121361252APending Publication Date: 2026-01-20ZHEJIANG DUFFREY PACKAGING TECH CO LTD
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Patent Information

Application Number
CN202511760071.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-27
Publication Date
2026-01-20

AI Technical Summary

Technical Problem

Existing multilayer co-extruded films struggle to achieve a stable, uniform, and durable matte texture and excellent optical performance without significantly increasing costs or compromising interlayer bonding, especially in complex seven-layer symmetrical high-barrier structures.

Method used

By setting a transparent matte masterbatch with a specific particle size in the outer layer to form a micro-rough structure, and setting a microsphere foaming agent in the sub-outer layer to form closed micropores, combined with gradient cooling technology, the outer layer is ensured to cool and solidify rapidly, while the inner layer is cooled slowly to form a multi-layer optical synergy system, achieving a frosted appearance and low light transmittance.

Benefits of technology

Without relying on the addition of large amounts of color masterbatch, an ideal frosted appearance and low light transmittance are obtained, while maintaining good mechanical properties and processing stability, thus improving the overall performance of the film.

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Abstract

The invention relates to a co-extrusion frosted film and a preparation method of the frosted film, the co-extrusion frosted film comprises the following components from outside to inside: an outer layer which comprises polyolefin and a transparent extinction master batch with a particle size of 1.5-4.0 [mu] m; the secondary outer layer comprises polyethylene resin and a submicrosphere foaming agent; a first adhesive layer; a polyamide barrier layer; a second adhesive layer; the inner layer comprises metallocene polyethylene with a high melt index; wherein the outer surface of the outer layer has a micro-coarse structure having an arithmetic average roughness Sa of 1.2 [mu] m to 3.5 [mu] m, and the secondary outer layer contains closed micropores formed by a microsphere foaming agent and having an average pore size of 0.5 [mu] m to 2.0 [mu] m. A preparation method of a frosted film comprises the following steps that S1, raw materials of all layers are taken and fed into corresponding extruders respectively, and the raw materials are conveyed to a co-extrusion die head after being melted and plasticized; s2, all the layers of melts converge in a co-extrusion die head and are co-extruded through a die head slit to form a composite melt membrane; and S3, cooling and shaping the composite melt membrane.
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Citation Information

Patent Citations

  • Seven-layer co-extrusion high-barrier film

    CN102501512A