SYSTEMS AND METHODS FOR MAKING MULTI-WALL CORRUGATED PIPE

WIPO Patent Application WO/2011/112456

A3

A system (10) is disclosed for manufacturing multi-wall corrugated polymer pipe. The system (10) includes an extruder (18) configured to co- extrude concentric annular tubes a corrugator (20) configured to form the concentric annular tubes into a dual -wall pipe having a smooth wall and a corrugated wall (122, 222), a cross -head die (22) configured to extrude an outer wall of pipe onto the corrugated wall (122, 222) of the dual -wall pipe, a vacuum punch (26) configured to penetrate the outer wall of pipe and draw a vacuum between the corrugated wall (122, 222) and the outer wall, such that the outer wall of pipe deforms inward toward the corrugated wall (122, 222) of pipe between bell and spigot portions of the corrugated wall (122, 222), and a cutter (40) configured to cut the pipe into sections where the vacuum punch (26) deformed the outer wall between the bell (112) and spigot (114) portions of the corrugated wall (122, 222). A method of manufacturing multi-wall corrugated polymer pipe is also disclosed.

SUTTON GERALD S (US)
KELLEY DAVID J (US)
KOLBET RANDALL A (US)

PCT/US2011/027210

January 26, 2012

March 04, 2011

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ADVANCED DRAINAGE SYST (US)
SUTTON GERALD S (US)
KELLEY DAVID J (US)
KOLBET RANDALL A (US)

F16L25/00; B29C48/09; B29C48/13; B29C48/30; B29C48/90; B29D23/00; B29C49/00

WO2009064396A1	2009-05-22
WO2004030894A1	2004-04-15

US20090127853A1	2009-05-21
US4942070A	1990-07-17
US20090200694A1	2009-08-13
JPS5134268A	1976-03-23

GARRETT, Arthur, S. (Henderson Farabow, Garrett &,Dunner, L.L.P.,901 New York Avenue, N, Washington DC, US)

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