E - Fixed Constructions – 02 – B
Patent
E - Fixed Constructions
02
B
18/759, 154/53.0
E02B 11/00 (2006.01) B29C 53/58 (2006.01)
Patent
CA 1259158
METHOD AND APPARATUS FOR FORMING DRAIN PIPES ABSTRACT OF THE DISCLOSURE A method of manufacturing drain pipes comprises extruding a strip from an extruder into a plasticized strip form, winding the extruder strip into a continuous spiral of successive coils, joining the lateral edges of the successive coils, and perforat- ing the plasticized strip. The strip is advantageously perforat- ed after it is extruded and before it is wound. An apparatus for effecting the formation of drain pipe comprises an extruder for extruding the plasticized continuous strip onto a winding drum as the drum is continuously wound and the strip is advanced along the drum to form successive spiral forms which has means for welding the lateral edges of the coils of the strip and including a rotable disc member having circumferentially spaced projectings which rotates adjacent the winding drum and perforates the extruded sheet as it is formed. In accordance with a preferred method of the invention a drain pipe is formed by extruding the plastic strip into a plasticized form from an extruder, winding the extruded strip into a continuous spiral of successive coils and joining the lateral edges of the successive coils and perforating the plasticized strip, preferably before it is wound or as it is being wound.
489208
Borden Ladner Gervais Llp
Troisdorfer Bau- Und Kunststoff Gesellschaft Mit Beschrankter Ha
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