B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
113/41
B21D 51/40 (2006.01) B21D 28/06 (2006.01) B21D 51/44 (2006.01) B65D 17/50 (2006.01) C25F 3/14 (2006.01)
Patent
CA 1159719
ABSTRACT OF THE DISCLOSURE The invention is concerned with a method of produc- ing sheet-metal lids for containers, in which the lid-blanks are stamped out of sheet- or strip-metal, are provided with a pouring area, are then formed and are provided with a pro- tective coating impeding corrosion, whereupon a flexible closure-strip is applied to the surface of the lid by gluing or hot-sealing for the purpose of sealing the pouring area hermetically. The method of the invention is characterized in that after a hole-pattern defining the pouring area has been stamped out of the sheet, the stamping burrs produced around the holes are removed by subjecting the sheet to an electro-chemical treatment. The invention enables one to remove the burrs in a reliable, practical and inexpensive manner and thereby prevents any corrosion at the edges of the holes, which may react with the substance in the container and render it unserviceable.
366628
Schlinsog Hans-Jurgen
Supik Helmuth
Schlinsog Hans-Jurgen
Supik Helmuth
Swabey Ogilvy Renault
LandOfFree
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