Film laminate metal plate having exceptional retort adhesion, and method for manufacturing same

Abstract

This film laminate metal plate having exceptional retort adhesion is provided with a metal plate, a resin film thermally fused to the surface of the metal plate, and air bubbles included between the metal plate and the resin film. When a 3D analysis image from a laser microscope is used to measure the height of the air bubbles, the average of the three highest air bubble heights is 0-5.0 [mu]m. Ina state where a test piece is used that has part of one longitudinal-direction end of the metal plate cut away so as to leave the resin film that is on the side forming the inner-surface side of a container when the film laminate metal plate is machined into at least the container, a 100 g weight is suspended on the one end of the test piece, and the other longitudinal-direction end of the test piece is turned back 180 degrees, when the test piece is subjected to a retort process for 30 minutes at a temperature of 125 DEG C, the length of the resin film that peels away from the metal plate is15 mm or less.

Description

technical field [0001] The present invention relates to a film-laminated metal sheet for food containers, and more particularly to a film lamination that has a small peeling length of the film and is effective in reducing air bubbles existing between the metal plate and the film that are harmful to can characteristics after canning Metal sheet and method for its manufacture. [0002] this application claims priority based on Japanese Patent Application No. 2016-46897 for which it applied to Japan on March 10, 2016, and uses the content here. Background technique [0003] Among film-laminated metal sheets, coated steel sheet cans based on Sn-free steel sheet (tin-free steel sheet, TFS) are widely used as food containers, but in recent years, bisphenol A, which is a raw material for coating, has become Because of environmental hormones, its use tends to be controlled; as far as paint manufacturers are concerned, bisphenol A-free can coatings are being developed. However, sin...

AI Technical Summary

Problems solved by technology

[0005] In the manufacture of film-laminated metal plates, hard rubber rollers are generally used to press the film on both sides of the heated metal plate to make it thermally welded, and the film thermally welded to the metal plate is firmly bonded to the metal plate. It is characterized by very high corrosion resistance, but has the following disadvantages: when the heated metal plate is passed through the plate at high speed and the film is pressed with a rubber roller, air bubbles are easily entrapped along the unevenness of the metal plate

In addition, since the outer surface of the film that is not in contact with the lamination roller is decompressed, the air bubbles expand instead. Therefore, if the film is pressed by the lamination roller in the state where the air bubbles expand, the air bubbles will burst and easily Cons of being a pinhole

[0011] In addition, in equipment that laminates films continuously at high speed, it is difficult to maintain a decompressed state in the space upstream of the pressure contact roller, and it is difficult to say that it is a practical method.

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