Polygonal can and method for forming thereof

Patent metadata

Field	Value
Publication number	US-10525520-B2
Application number	US-201515121144-A
Country	US
Kind code	B2
Filing date	Feb 26, 2015
Priority date	Feb 27, 2014
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

Provided is a polygonal in which a decoration effect equivalent to that of a cylindrical base-can is obtained without causing folding or deformation in a can body-part. Bottom-part outer-peripheral parts (A-2) of a cylindrical base-can that are expected to form linear parts (B-2) of a polygonal can (B) are moved inward in a radial direction, while bottom-part outer-peripheral parts (A-1) of the cylindrical base-can that are expected to form corner parts (B-1) of the polygonal can are moved outward in the radial direction. Thus, the polygonal can is molded such that the body-part cross-section peripheral length of the cylindrical base-can and the body-part cross-section peripheral length of the molded polygonal can have a substantially isometric relationship.

First claim

The invention claimed is:

1. A method for forming a polygonal can by which a cylindrical base-can formed of a body part and a bottom part is formed into the polygonal can having linear parts and corner parts in a cross-section of the body-part, wherein
a shape of an outer periphery of the bottom-part is changed into a shape corresponding to a cross-section of the body part of the polygonal can, the method comprising:
moving portions of the outer periphery of the bottom part of the cylindrical base-can inwardly in a radial direction to form the linear parts of the polygonal can;
forming convex parts in some areas of the portions of the cylindrical base-can that are moved inwardly; and
moving, other portions of the outer periphery of the bottom part of the cylindrical base-can outwardly in the radial direction to form the corner parts of the polygonal can,
wherein a peripheral length of the cross-section of the body part is substantially the same before and after the forming.

2. The method for forming a polygonal can according to claim 1 , wherein
at least a cylindrical surface of the cylindrical base-can is decorated.

3. The method for forming a polygonal can according to claim 1 , wherein
material supply parts are formed in some areas of the bottom surface of the cylindrical base-can to form the corner parts at the bottom part of the polygonal can, and
the other portions of the outer periphery of the bottom part of the cylindrical base-can are moved outwardly in the radial direction while the material supply parts are pressed by a crushing member inserted in the can.

4. The method for forming a polygonal can according to claim 1 , wherein
linear-part forming by moving the portions of the outer periphery of the bottom part of the cylindrical base-can inwardly in the radial direction and corner-part forming by moving the other portions of the outer periphery of the bottom part of the cylindrical base-can outwardly in the radial direction are performed in a same step.

5. The method for forming a polygonal can according to claim 1 , wherein
the moving the portions of the outer periphery of the bottom part of the cylindrical base-can inwardly in the radial direction is accomplished by a press tool.

6. The method for forming a polygonal can according to claim 5 , wherein
the body part of the polygonal can is embossed by the press tool and a shaft inserted in the can.

Assignees

• Toyo Seikan Group Holdings Ltd

Inventors

• Kobayashi Tomomi
• Matsumoto Naoya
• Aihara Takeshi

Classifications

• B65D1/18

  of polygonal cross-section · CPC title

• B21D51/2646 Primary

  Of particular non cylindrical shape, e.g. conical, rectangular, polygonal, bulged · CPC title

• B21D17/02

  by pressing (grooving or notching of bolts, studs, or the like B21K1/54) · CPC title

• B65D7/06

  of polygonal cross-section, e.g. tins, boxes · CPC title