MANUFACTURING METHOD FOR LID THAT REQUIRES NO CAN OPENER

Title:

MANUFACTURING METHOD FOR LID THAT REQUIRES NO CAN OPENER

Document Type and Number:

WIPO Patent Application WO/2010/061961

Kind Code:

A1

Abstract:

In a manufacturing method for lids that require no can opener, a panel structure part and a score are formed using a laminated steel sheet with a resin coating on both sides. In a cross-sectional view of a scoring die used to form the aforementioned score, the front end is a curved line, the two edges to the sides of the front end have a scoring blade part that is configured with tangents of the curved line, the front end is configured with a curved line with a curvature radius of 0.2‑0.4mm, the elevation angle (θ) of the two edges is 0.3 ≦ tanθ ≦ 1.0 with respect to the surface of the lid, and the panel structure part is formed synchronized with the pressing of the scoring die against the surface of the laminated steel sheet during the formation of the score. With the manufacturing method, a lid that requires no can opener and has excellent appearance can be manufactured without distortion and requiring no lid machining equipment.

Inventors:

KOJIMA KATSUMI (JP)
KUBO HIROSHI (JP)
YAMANAKA YOICHIRO (JP)
TADA MASAKI (JP)
IWASA HIROKI (JP)

Application Number:

PCT/JP2009/070265

Publication Date:

June 03, 2010

Filing Date:

November 26, 2009

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
KOJIMA KATSUMI (JP)
KUBO HIROSHI (JP)
YAMANAKA YOICHIRO (JP)
TADA MASAKI (JP)
IWASA HIROKI (JP)

International Classes:

B21D51/44; B65D17/28

Foreign References:

JP2004298887A	2004-10-28
JP2006088209A	2006-04-06
JPS5516800A	1980-02-05
JPS4840553B1	1973-12-01
JPH09108758A	1997-04-28
JPH06115546A	1994-04-26
JPH1191775A	1999-04-06
JP2004298887A	2004-10-28

Other References: