LAMINATED METAL SHEET FOR CONTAINERS, METHOD FOR PRODUCING METAL CAN, AND METHOD FOR EVALUATING FORMABILITY OF METAL SHEET (AS AMENDED)

摘要

Provided are a laminated metal sheet for containers that has excellent formability after heat treatment performed after coating, printing, etc. and is suitable for DR cans, a method for producing a metal can using the above metal sheet and a method for evaluating the formability of a metal sheet. The crystal structure of a top layer of a laminate layer of the laminated metal sheet for containers and the crystal structure inside the laminate layer are controlled in a sophisticated manner. Specifically, the intensity ratio I2968/I3085 of the Raman band intensity (I2968) at a peak position around 2,968 cm−1 to the Raman band intensity (I3085) at a peak position around 3,085 cm−1 that are obtained by laser Raman spectroscopy is used. This intensity ratio is controlled within a specific range.

主权项

1. A laminated metal sheet for containers, the laminated metal sheet comprising a metal sheet and a laminate layer that covers at least one side of the metal sheet, the laminate layer including a single layer composed mainly of polyester or a plurality of layers composed mainly of the polyester,
an intensity ratio I2968/I3085 of a Raman band intensity (I2968) at a peak top position around 2,968 cm−1 to a Raman band intensity (I3085) at a peak top position around 3,085 cm−1 being a range of 0.3 to 0.9, the Raman band intensity (I2968) and the Raman band intensity (I3085) being determined by a laser Raman method on a surface of the laminate layer and when an entire thicknesswise cross section of the laminate layer is irradiated with linearly polarized laser light in a direction perpendicular to the cross section of the laminate layer, the Raman band intensity ratio I2968/I3085 being within a range of 0.7 to 1.5.