Claims
- 1. A method of forming a composite container including a vertically arranged tubular composite body wall, and a synthetic plastic end closure member, comprising the steps of
- (a) reversely curling outwardly the upper end of the composite body wall member; and
- (b) radially inwardly compressing only the outer circumferential surface of the uppermost extremity of the reversely curled portion toward the adjacent body wall member while simultaneously maintaining the inner circumferential wall surface thereof in a cylindrical configuration, thereby to cause the lower end of the reversely curled portion to project radially outwardly and thereby define an annular locking projection.
- 2. A method of forming a composite container as defined in claim 1, which further comprises the step of mounting a closure member on said body member one end, said closure member including an annular flange portion arranged concentrically about the reversely curled inner projecting portion, and an annular locking rib carried by said flange portion and extending in locking relation beneath said locking projection.
- 3. The method as defined in claim 2, and further including the preliminary step, prior to curling, of relieving the outer circumferential surface of the upper extremity of the body wall member, said relieved portion being reversely curled to a position in which the free extremity of the inner projecting portion extends in overlapping relation beyond the non-relieved portion of the body member, the upper extremity of the reversely rolled portion being compressed within the relieved area.
Parent Case Info
This application is a division of Ser. No. 06/095,528 filed Nov. 19, 1979, now U.S. Pat. No. 4,299,350.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
95528 |
Nov 1979 |
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