B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/06 (2006.01) B29C 57/02 (2006.01)
Patent
CA 2182132
A method and apparatus extrudes a two-walled plastic pipe with inner and outer walls and an integral joining means and forms the inner wall as a continuous cylindrical sleeve that is bonded to the inner portion of the outer wall. When the outer wall is formed as a cylindrical corrugation, the inner ribs merge with the outer diameter of the inner wall and periodically during the continuous casting a mold section of greater diameter defines a bell region which ultimately becomes the joining means between two lengths of pipe though continuously manufactured according to the invention by a travelling tunnel mold. The pipe, after molding, is severed at the bell section and the lead portion of the bell section is severed away and the inner wall of the bell portion is also cut away so that an integral bell to a fixed length of corrugated two-walled pipe is formed.
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