METHOD FOR MARKING SHEET METAL BLANKS AND FOR WELDING CAN BODIES FROM MARKED SHEET METAL BLANKS
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United States of America Patent
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Issued Date -
Nov 19, 2009
app pub date -
May 13, 2009
filing date -
May 14, 2008
priority date (Note) -
Abandoned
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Abstract
A method for marking tin coated sheet metal blanks is provided in which the marking is indicative whether the blank comprises an edge region that includes a tin coating thicker than the rest of the blank. This marking is preferably brought on the blanks when a plurality of blanks is cut from a sheet metal plate. In the alternative the marking may have been applied to the sheet metal plate already. The sheet metal blanks thus marked are provided in form of a stack comprising marked and unmarked blanks, depending on whether there is a thicker edge region coating present on the individual blank or not. When making container bodies of these blanks by de-stacking and rounding the sheet metal blanks and welding the longitudinal seam of the rounded container body blanks, the marking is read in the container making apparatus and at least one welding parameter is changed for welding container body blanks with a marking in comparison with container body blanks without marking.
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