Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1985-09-12
1987-07-07
Simmons, David
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
15624413, 15624415, 15624418, 156252, 264156, B32B 3100
Patent
active
046785264
ABSTRACT:
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 perforating the plasticized strip. The strip is advantageously perforated 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.
REFERENCES:
patent: 3161554 (1964-12-01), Blackford
patent: 3300355 (1967-01-01), Adams
patent: 3477891 (1969-10-01), Hawerkamp
patent: 4470942 (1984-09-01), Beretta
patent: 4473525 (1984-09-01), Orori
patent: 4500284 (1985-02-01), Lupke
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