Fabricating one-piece can bodies with controlled side wall...

Details Fabricating one-piece can bodies with controlled side wall... Fabricating one-piece can bodies with controlled side wall...

B - Operations, Transporting

21

D

B21D 22/20 (2006.01) B21D 22/28 (2006.01) B21D 22/30 (2006.01) B21D 51/26 (2006.01) B65D 1/16 (2006.01)

Patent

CA 2070802

2070802 9206804 PCTABS00011 New technology for fabricating a one-piece cup-shaped can body. A plurality of successive diameter-reduction operations are carried out on a planar blank (84) and cup-shaped work product (96) during which sidewall height is increased and sidewall substrate is decreased in thickness to provide controlled uniformity in sidewall substrate thickness over about 85 % to about 95 % of sidewall height for such can body. The fabricating tooling provides for a preselected clearance between a punch peripheral wall and a die cavity internal wall (88) in each of such plurality of diameter-reduction operations to achieve a desired decrease inside wall thickness as the precoated substrate is moved into a die cavity (86) by relative movement of its respective punch (90).

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