B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/759, 18/522.5
B29D 23/18 (2006.01) B29C 49/00 (2006.01)
Patent
CA 1128273
Abstract of the Disclosure . Apparatus and method for producing thermoplastic corrugated tub- ing having substantially uniform thickness throughout comprises extruder and step of forming hollow ow smooth-walled extrudate. Corrugating structure immediately adjacent extruder is arranged to receive extrudate and to form corrugations therein. Such structure includes continuously moving cooperating mold blocks configured to form alternating annular peak por- tions, valley portions and interconnecting side wall portions in extrudate when it is blown into intimate engagement with configured mold blocks. Thickness of extrudate being corrugated is controlled to provide a rela- tively thin extrudate portions during formation of annular valley portions and relatively thick extrudate portions during formation of annular peak and interconnecting side wall portions. Stronger tubing at light weight is produced.
328277
Advanced Drainage Systems Inc.
Fetherstonhaugh & Co.
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