Patent ID: 7497350
Filing Date: 2009-03-03
Classification: B65D

Abstract:
1. A curled portion, which is formed on an opening portion of a metal can, comprising: a resin film for covering both surfaces of a metal sheet forming at least the opening portion of the metal can and vicinity thereof; a folded portion, which is folded outwardly to confine folded layers including a trim end portion, and which is squeezed inwardly in a radial direction of the opening portion to contact confined layers in the folded portion with one another via the resin films; an inclined face extending downwardly and outwardly from the folded portion to a portion of the sheet to be threaded; and a contact portion located at a lower end of the curled portion is in contact with the inclined face; wherein the folded portion has a tapered configuration, in which the metal sheet is folded into four layers overlapped with one another except for upper and lower end portions thereof in a substantially axial direction with respect to a trim end portion in proximity with a portion of the sheet to be threaded, and wherein the upper portion is formed so as to be gradually thinner towards a top portion thereof.