Patent ID: 9662699
Date: 2017-05-30
CPC Classifications: B05D,B21D,B32B,B65D,Y10T

Claim:
1. A resin-coated Al sheet for a drawn and ironed can exhibiting excellent luster, the resin-coated Al sheet to be formed into a can body by drawing and ironing, wherein an Al surface which forms an outer surface of the can and has an arithmetical mean roughness (Ra) of 0.5 μm or less is covered with an outer surface resin layer having a thickness which falls within a range of 0.1 μm to 2 μm, the resin layer having a Martens hardness of 50 N/mm a glass transition temperature of the outer surface resin layer is 40° C. or more; a regular reflectance of the outer surface of the drawn and ironed can is 28.4% or more; and wherein the Al surface has a plurality of recesses and protrusions where the recesses and the protrusions define a surface roughness profile and where the surface roughness profile has a center line; a number of unique pairs of recesses and protrusions meeting a criteria is no more than 10/mm, wherein the criteria for the unique pair is defined by the recess of the unique pair extending at least −0.1 μm beneath the center line and the protrusion of the unique pair is when a following protrusion extends above the center line, such that each recess and protrusion belonging to the unique pair meeting the criteria is counted only once.