METHOD FOR MANUFACTURING CAN LID, CAN LID, AND CAN BODY
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United States of America Patent
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Issued Date -
Dec 17, 2015
app pub date -
Mar 4, 2014
filing date -
Mar 22, 2013
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Abstract
In the elongation processing shown in A, the height of the panel (11) is maintained by supporting the panel (11) from the bottom side, the curled portion (13) is held from the top side and the bottom side, and the movement of the curled portion (13) is restricted in both of the upper direction and the lateral direction. In the elongation processing, external force is applied to the bottom part of the annular groove (12) in the downward direction in this state, and the bottom part of the annular groove (12) is pressed down. Accordingly, the panel (11) is pulled toward the outer direction in the diameter direction of the panel (11), and the tension is generated in the panel (11) as shown by the black arrow, which is intended to reduce distortion of a can lid while reducing formation of shapes in the can lid.
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