Receptacles – End wall structure – One-piece side and end wall
Patent
1989-09-01
1993-04-06
Pollard, Steven M.
Receptacles
End wall structure
One-piece side and end wall
B65D 800
Patent
active
051995964
ABSTRACT:
New technology for deep drawing can bodies for use in the manufacture of two-piece cans for food and beverage products from precoated flat-rolled sheet metal can stock in which damage to can stock precoated on both surfaces with an organic coating is avoided and draw-forming of the side wall is controlled to decrease metal requirements. A draw die cavity entrance (47, 74) is selected to provide at least a major portion of its curvilinear surface having a radius of curvature of about five times nominal sheet metal thickness gage, or less, e.g. a maximum radius of curvature of 0.04 inch is used for the more commonly used can stock materials. During cup redraw, nesting of curvilinear clamping surfaces (21, 26) of the prior art is eliminated; the compound curvilinear juncture of a work product cup, between its end wall and side wall, is reshaped about a clamping ring compound curvilinear transition zone (72) of smaller surface area than the cup juncture and, the sheet metal is clamped solely between planar clamping surfaces (63, 71) during redraw to a smaller diameter utilizing a male punch (66) with a punch nose (79) having a significantly larger surface area than that of the cavity entrance zone.
REFERENCES:
patent: 3360157 (1967-12-01), Bolt et al.
patent: 4488538 (1984-12-01), Fischer
patent: 4515284 (1985-05-01), Lee, Jr. et al.
patent: 4584859 (1986-04-01), Saunders
patent: 4646930 (1987-03-01), Karas et al.
Steel Cans, Steel-in-Packaging Report, American Iron and Steel Institute.
Steel in Packaging, Trends in Materials and Technology . . . , American Iron and Steel Institute.
Baker Raymond N.
Pollard Steven M.
Weirton Steel Corporation
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