Method of making perforated tubular member for perforating...

Details Method of making perforated tubular member for perforating... Method of making perforated tubular member for perforating...

B - Operations, Transporting

21

D

113/54

B21D 51/16 (2006.01) B21D 51/28 (2006.01)

Patent

CA 1115136

METHOD OF MAKING PERFORATED TUBULAR MEMBER FOR PERFORATING THERMOPLASTIC FILM Abstract A method is described for making a relatively thin wall perforated tubular member having a wall which is perforated by an array of radially inwardly tapered apertures. A pattern cylinder is formed with radially outwardly extending protruberances, these being tapered to radially outwardly disposed free ends and comprising an inside-out negative pattern for the desired array of perforations. Metal is then applied between the protruberances to form an inside-out perforated tubular member, which is longitudinally slitted, reverse rolled and longitudinally seamed along the slitted edges.

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