Metal appearance metal band of high appearance gloss stability

Abstract

Provided is a metal strip having metallic appearance and excellent brightness stability used for ironing processing can, which has metallic appearance coatings on outside of the can wherein the coatings comprise at least 5% by mass spreading metal filler and have the glass transition temperature of 50 to 120 deg.C. The metal strip has resin coatings having metallic appearance on outside of can wherein the coatings comprise spreading metallic fillers of at least 5% by mass based on the mass of coatings and have the glass transition temperature of 50 to 120 deg.C. The coatings have the dynamic fraction coefficient of up to 0.3 at test condition of 60 deg.C and pencil hardness of at least H at test condition of 50 deg.C. Also, the metallic appearance coatings is formed by using paint comprising metallic filler and resin components for paint.

Description

technical field [0001] The present invention relates to a metallic appearance metal strip excellent in appearance gloss stability for manufacturing a thinned drawn can having a stable glossy appearance and a seamlessly processed can body formed from the metal strip. Background technique [0002] Previously, in the field of beverage containers, low-cost mass production was easy, so thinned and deep-drawn cans were widely used. In general, these cans are generally made of tin-plated or aluminum steel sheets, and are thinned and drawn while applying a lubricant to the surface in order to ensure thinning and deep drawing properties. Cans produced by thinning and deep drawing must be covered with paint in order to ensure rust prevention on the outside and corrosion on the inside. Through the process of low productivity such as washing and removing lubricant with detergent such as alkali → chemical conversion treatment → painting. As a technique to improve productivity by omitti...

AI Technical Summary

Problems solved by technology

However, when laminating the cover metal tape, it is necessary to use a film with a film thickness of at least 10 microns on both sides in order to be able to withstand thinning and deep drawing and ensure a film strength that can be mass-produced.

[0003] In addition, the prior art also has a problem in ensuring the designability of the outer surface of the can, and even in the case of a metal strip, especially in the case of a steel plate, this tendency is more pronounced.

For example, in the case of a general deep-drawn can (DI can), when a steel plate is used, even if it is treated with tin plating, the whiteness of the outer side is lower than that of an aluminum plate, and there is a problem of poor clarity in the design. , so it is required to improve this

[0004] Generally known as a technique for improving the design of cans is to form a steel plate laminated with a white colored PET film in advance to form a can. During thinning processing such as drawing processing, there is a problem that the thinning ratio tends to be uneven in the height direction of the tank, and whiteness unevenness is likely to occur

In addition, the technology of forming a thinned and drawn can with a metal strip with a metallic appearance has also been studied. This metal strip with a metallic appearance can form a coating film containing metal fillers on the outer side of the tank. For coatings containing only metal fillers, There is a problem that uneven gloss and color tone are prone to occur due to poor thinning rate

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