Method of manufacturing bottle can
AssigneeUniversal Can Corporation
InventorsTatsuya Hanafusa, Ryoichi Ito, Masahiro Hosoi
Life of this patent
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Abstract
In this bottle can manufacturing method, when a portion located at the skirt portion 7 is being molded, the portion extending in an opposite direction in which the male threaded portion 6 extends from a lower end 6a of the male threaded portion 6 over a range of at least approximately 180° along a circumferential direction of the skirt portion 7, the inner surfaces of molding pre-form portions of the first circumferential wall portion and the convexly curved surface portion from among the molding pre-form portions of the skirt portion 7 are pressed outward in the radial direction of the bottle can body.
Claims6
A bottle can manufacturing method comprising
- molding a skirt portion at a pipe sleeve portion of a bottle can body, the skirt portion being provided with:
- a first circumferential wall portion that is joined to a bottom end of a male threaded portion and whose diameter becomes gradually larger moving downwards in the can axial direction;
- and a second circumferential wall portion that is joined to a bottom end of the first circumferential wall portion via a convexly curved surface portion which protrudes towards the outer side in the radial direction, and whose diameter becomes gradually smaller as it moves downwards;
- wherein
- when a portion located at the skirt portion is being molded, the portion extending in an opposite direction in which the male threaded portion extends from a lower end of the male threaded portion over a range of at least approximately 180° along a circumferential direction of the skirt portion, the inner surfaces of molding pre-form portions of the first circumferential wall portion and the convexly curved surface portion from among the molding pre-form portions of the skirt portion are pressed outward in the radial direction of the bottle can body.
Dependencies are inferred from the claim text.