POLYMER FILMS SURFACE ROUGHING Russian patent published in 2020 - IPC B32B15/08 B32B15/20 B32B38/18 

FIELD: metal processing.

SUBSTANCE: invention relates to metal processing, and more specifically to improvement of surface roughness of laminated metal articles, such as aluminium cans for beverages. Roughness of the surface of the polymer film with which the metal substrate is laminated can be improved by using sufficient heating after applying a layer of wax onto the polymer film. In some cases, a thin liquid film or a water-based wax dispersion layer can be applied on a surface of a metal substrate laminated with a polymer film. After heating the polymer film and the wax layer to a temperature at which the polymer film and the wax layer begin to melt, the surface roughness of the polymer film can be improved due to the presence of wax.

EFFECT: invention ensures creation of a jar for beverages with sufficient protection between beverage jar metal and beverage contained therein in order to avoid metal damage with aggressive beverages such as carbonated beverages that prevents undesirable effect on beverage such as colour change, corrosion or change of taste.

13 cl, 23 dwg, 2 tbl, 21 ex