发明名称 |
Ring and closure for cans |
摘要 |
The process of the present invention allows the manufacture of lacquered aluminum or tin-plate rings which have the inner edge thereof bent over outwards so that they are suitable for the closures on cans for foodstuffs. A ring blank made of lacquered sheet is pre-shaped by deep drawing to form the curvature needed for bending over the inner cut edge. The final shaping of the pre-shaped blank into a ring for a can lid takes place, after stamping out the opening, by stretching and bending over the cut edge. When a tear-back membrane is sealed on to the bent-over edge, the ring is suitable as an easyly opened closure for cans for foodstuffs.
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申请公布号 |
US4253584(A) |
申请公布日期 |
1981.03.03 |
申请号 |
US19790040499 |
申请日期 |
1979.05.21 |
申请人 |
SWISS ALUMINIUM LTD. |
发明人 |
BLOECK, SIEGFRIED;LUETHI, RUDOLF |
分类号 |
B21D51/38;(IPC1-7):B65D41/00 |
主分类号 |
B21D51/38 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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