Method for producing coated aluminium alloy strips for producing photographic quality decorations by dry transfer

Abstract

The invention relates to a method for continuously producing an aluminium alloy strip for transferring a sublimable decoration from a temporary carrier consisting in using the aluminium alloy strip having a gloss and high-gloss quality, in anodising and sealing said strip and in coating the anodised strip with a transparent lacquer consisting of a polyester and polyurethane mixture. Said anodisation and sealing are substitutable by a HELIA process under EP 0 745 703 patent in order to form a compact oxide barrier whose thickness ranges from 140 to 200 nm. The thus produced aluminium alloy strip for sublimation transfer and a strip or sheet decorated after said transfer from the temporary carrier are also disclosed.

Description

technical field [0001] The invention relates to a process for the continuous industrial production of strips of aluminum alloys coated with varnishes, which is particularly suitable for obtaining a photographic-quality décor by sublimation from a temporary carrier using dry transfer techniques, and strips produced according to this method . Background technique [0002] The first important applications of dry transfer of decoration by sublimation from temporary carriers were in the natural and later synthetic textile industry. [0003] According to this method, the image to be transferred is in most cases printed onto a paper support using conventional printing techniques. To effect this transfer, the support is pressed onto the material onto which it is desired to transfer the sublimable image for about 30 seconds, usually at a temperature of 200-230°C. The components of the ink making up the image then immediately change from the solid state to the gaseous state and migr...

AI Technical Summary

Problems solved by technology

Since said bonding is known to be very difficult in the case of aluminum, the treatments considered are conventional anodizing or chemical conversion in order to obtain a porous layer at least on the surface to bond the resin, but this has the same All the already described disadvantages related to surface-like

[0015] It is also known that aluminum alloy surfaces are "bare" or naturally coated with a few nm thick oxide layer (uneven by its nature), and when varnished without any other treatment, The aluminum alloy surface is fragile and is especially prone to scratches