Lapped seam can
AssigneeHokkai Can Co., Ltd.
InventorsYuzo Takahashi, Yoshimi Wazima, Akira Nakada, Yasuyuki Tanaka, Katsumi Nagai, Nobuo Takahashi, Hiroshi Matsuda, Eizi Aizawa, Shiro Oyama
Life of this patent
Estimating the term…
Abstract
A lapped seam can having a high safety characteristic used as containers of soft drinks or beer wherein the cut-burrs at the end of the inner end portion of the can blank are completely removed so that micro-leak passages apt to occur in the lapped seam can are shut off, thereby permitting a long term storage of the can content without deterioration by preventing metal from being dissolved out from said inner end portion.
Claims5
A lapped seam can having the opposite end portions of the can blank joined together with organic adhesive films and a double seam portion comprising:
- a first inclined surfaced end portion of said blank terminating in an end face the thickness of which is about one-third of the original thickness of the can blank;
- a first organic adhesive film covering the inner and outer surfaces of said first end portion including the end face;
- a second end portion of said blank having an end face;
- a second organic adhesive film stuck onto the inner surface of said second end portion of the can blank coming outside of said first end portion at the lapped seam;
- said first organic adhesive film stuck onto the outer surface of said inner end of the can blank joined to said second organic adhesive film;
- said second adhesive film forming a raised portion on one end thereof and coupled to the end face of said inner end portion to form an inclined surface continuous to said inclined surface of said first end portion;
- said second adhesive film forming a raised portion on the other end thereof and coupled to the end face of said outer end portion of the can blank;
- said double-seam portion having a sealing compound interposed in voids formed between said two end portions of the can blank when double-seamed;
- said voids also being filled up with said adhesive film layers;
- the opposite sides of the double-seamed lapped seam portion forming slack curved surfaces continuous to the double-seamed ring portion.
Dependencies are inferred from the claim text.