Laminate metal plate, method for manufacturing laminate metal plate, and laminate metal container

JPWO2026014491A5Active Publication Date: 2026-06-16JFE STEEL CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
JFE STEEL CORP
Filing Date
2025-11-27
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing laminated metal sheets used for metal containers face challenges in maintaining adhesion between the thermoplastic resin film and the metal sheet, particularly after retort sterilization, and suffer from whitening due to bubble formation, which affects the appearance of the containers.

Method used

A laminated metal sheet design with specific mass ratios of PET and PBT in the thermoplastic resin film, combined with controlled dispersion states and X-ray diffraction characteristics, ensures excellent adhesion and prevents whitening after retort sterilization.

Benefits of technology

The solution provides laminated metal sheets with improved primary adhesion and resistance to appearance deterioration, even after retort sterilization, enhancing the quality and durability of metal containers.

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Abstract

Provided is a laminate metal plate which is exceptional in both primary adhesion and adhesion after retort sterilization treatment, and does not undergo deterioration of appearance due to whitening even after retort sterilization treatment. A laminate metal plate 10 according to the present invention is configured such that a first film 31 is laminated on at least one surface of a metal plate 20. The first film 31 is a polyester film in which a polyester component is composed of a prescribed first polyester and second polyester. The mass ratio of the first polyester and the second polyester is 20:80 to 50:50, where 100 represents the entire amount of polyester in the first film 31. Two characteristic widths w1 and w2 calculated from an image obtained by binarizing a phase image, which is obtained by observing a cross-sectional part of the first film 31 using a dynamic force mode of a scanning probe microscope, satisfy a prescribed relationship.
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