Process for forming pipe of improved construction

Details Process for forming pipe of improved construction Process for forming pipe of improved construction

B - Operations, Transporting

29

C

B29C 47/90 (2006.01) B29C 47/00 (2006.01) B29C 47/88 (2006.01) B29D 23/24 (2006.01) F16L 9/18 (2006.01)

Patent

CA 2187324

A plastic pipe of an improved construction such that the pipe has apertures formed therein when the pipe is viewed in cross section, the pipe being made by a process including extruding a hot plastic flow through a die head (17) having a plurality of first sized gaps and second sized gaps, the second sized gaps having an aperture located inside each gap. A die (15) is secured to a manifold assembly (10), with the manifold assembly (10) having sets of tubes located centrally of one another, each set of tubes including a water inlet tube (150), a tube through which a vacuum is pulled (140) and a water return tube (130). Each set of tubes is positioned longitudinally within a respective die manifold tube (165) which extends through the die (15).

L'invention se rapporte à un tuyau en plastique à structure améliorée, ce tuyau présentant des orifices, vu en coupe transversale. Le tuyau est fabriqué à l'aide d'un procédé d'extrusion d'un écoulement de plastique chaud dans une tête de filière (17) possédant une pluralité de cavités d'une première dimension et de cavités d'une seconde dimension, ces dernières comportant chacune une ouverture. Une matrice (15) est fixée à un ensemble tubulure (10) qui possède plusieurs jeux de tubes situés au centre les uns des autres, chaque jeu de tubes comprenant un tube (150) d'admission d'eau, un tube dans lequel est créé un vide (140) et un tube de renvoi d'eau (130). Chaque jeu de tubes est placé longitudinalement dans un tube respectif (165) de la tubulure, qui s'étend à travers la matrice (15).

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