Draw-ironed metal vessel having circumferential side seam
AssigneeToyo Seikan Kaisha, Ltd.
InventorsKatsuhiro Imazu, Hiroshi Matsubayashi, Makoto Horiguchi, Kazuo Taira, Seishichi Kobayashi, Hiroshi Ueno
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Abstract
Disclosed is a draw-ironed metal vessel having a circumferential side seam, which is formed by lap-bonding of open end portions of upper and lower members, each consisting of a seamless molded metal cap, wherein the side wall of at least one of said upper and lower members is formed by draw-ironing a tin-plated steel plate at an ironing ratio of at least 20% and a spout having a diameter smaller than that of the side wall of the vessel is formed on the top wall of the upper member.
Claims4
In a draw-ironed metal vessel having a circumferential side seam, which is formed by lap-bonding of open end portions of upper and lower members by means of an adhesive, each consisting of a seamless molded metal cup, an improvement which comprises:
- (a) the lower member comprising a tall thin side wall portion and a thick bottom portion, said lower member being formed by draw-ironing a tin-plated steel plate at an ironing ration (R.sub.I) of at least 20%, said ironing ration (R.sub.I) being defined by the following formula:
- ##EQU3## wherein T.sub.B is the thickness of the bottom portion of the lower member and T.sub.W is the thickness of the sidewall portion of the lower member, said lower member being subjected to a surface treatment with a phosphate and/or a chromate and having a protecting varnish on the entire surface thereof;
- (b) The upper member comprising a short side wall, a top wall and a spout having a diameter smaller than that of the side wall, said upper member being formed by shallow drawing of a protecting varnish-coated tin-plated steel plate;
- and
- (c) a heat-melt-bondable resin adhesive interposed between the open end portions of the upper and lower members.
Dependencies are inferred from the claim text.