METHOD FOR MANUFACTURING METAL BOTTLE, AND METAL BOTTLE

• US 20190329925A1
• Filed: 10/10/2017
• Published: 10/31/2019
• Est. Priority Date: 12/22/2016
• Status: Active Grant

• Current Assignee: Toyo Seikan Co., Ltd. (Toyo Seikan Group Holdings, Ltd.)
• Original Assignee: Toyo Seikan Co., Ltd. (Toyo Seikan Group Holdings, Ltd.)
• Inventors: AIHARA, Takeshi, TAMURA, Masaomi, HASEGAWA, Toshiyuki, MURASE, Takeshi, NAKAMURA, Tomohiko, MATSUMOTO, Naoya, SASAJIMA, Nobuhiro
• Granted Patent: US 11,440,695 B2
• Time in Patent Office: Days
• CPC Class Codes: B21D 51/2623 Curling
• CPC Class Codes: B21D 51/38 Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
• CPC Class Codes: B21D 51/40 Making outlet openings, e.g. bung holes
• CPC Class Codes: B65D 1/0246 Closure retaining means, e.g. beads, screw-threads
• CPC Class Codes: B65D 41/04 Threaded or like caps or cap-like covers secured by rotation

Abstract

A method for manufacturing a metal bottle having a mouthpiece in an upper part of a bottomed cylindrical bottle body, including forming a screw part on the mouthpiece and then forming a curl at a tip of the mouthpiece. During formation of the screw part, a height of the first-stage screw thread from a tip side in a complete screw part and a height of the second-stage screw thread from the tip side are substantially equal and a distance between an apex part of the first-stage screw thread and a bottle axis is smaller than a distance between the apex part of the second-stage screw thread and the bottle axis. After formation of the curl, a distance between the apex part of the first-stage screw thread and the bottle axis and a distance between the apex part of the second-stage screw thread and the bottle axis are substantially equal.

Claims

1. A method for manufacturing a metal bottle having a mouthpiece part in an upper part of a bottomed cylindrical bottle body, the method comprising the steps of:

forming a screw part on the mouthpiece part and, after formation of the screw part, forming a curl part at a tip of the mouthpiece part, wherein,

during the formation of the screw part, a height of the first-stage screw thread from a tip side in a complete screw part and a height of the second-stage screw thread from the tip side are substantially equal and a distance between an apex part of the first-stage screw thread and a bottle axis is formed smaller than a distance between an apex part of the second-stage screw thread and the bottle axis and,

after the formation of the curl part, a distance between the apex part of the first-stage screw thread and the bottle axis and a distance between the apex part of the second-stage screw thread and the bottle axis are formed substantially equal.

2. The method for manufacturing the metal bottle according to claim 1, wherein, after the formation of the curl part, the height of the first-stage screw thread in the complete screw part is larger than the height of the second-stage screw head.

3. A metal bottle, comprising a mouthpiece part in an upper part of a bottomed cylindrical bottle body;

a screw part in the mouthpiece part, and including a curl part at a tip of the mouthpiece part, wherein

a height of a first-stage screw thread from a tip side in a complete screw part is larger than a height of a second-stage screw thread from the tip side, and a distance between an apex part of the first-stage screw thread and a bottle axis and a distance between an apex part of the second-stage screw thread and the bottle axis are substantially equal.