F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 9/12 (2006.01) B29C 44/22 (2006.01) B29C 47/00 (2006.01) B29C 47/38 (2006.01) B32B 1/08 (2006.01) F16L 9/133 (2006.01) F16L 9/18 (2006.01) F16L 11/08 (2006.01) F16L 11/12 (2006.01)
Patent
CA 2388635
A multilayer pipe which comprises at least an inner layer and an outer layer. The inner layer is made of extrudable plastic, such as polyethylene PE, cross- linked polyethylene PEX or polypropylene PP. The outer layer forms a fire-protecting layer and the matrix plastic of the outer layer is also made of extrudable plastic. A foaming agent, which does not react during the manufacture of the pipe, is mixed with the matrix. Further, the outer layer contains at least one additive in such a manner that the outer layer has a pipe-reinforcing component and a fire- retardant component. Most preferably, at least the outer layer is extruded by an extruder having a screw length ratio of less than 10 to its biggest diameter.
Tuyau multicouche qui comprend au moins une couche interne et une couche externe. La couche interne est faite de matière plastique extrudable, telle que le polyéthylène PE, le polyéthylène réticulé PEX ou le polypropylène PP. La couche externe forme une couche ignifuge et la matrice plastique de la couche externe est également constituée de matière plastique extrudable. Un agent moussant, qui ne réagit pas pendant la fabrication du tuyau, est mélangé avec la matrice. En outre, la couche externe contient au moins un additif de sorte que la couche externe possède un composant de renforcement du tuyau et un composant ignifuge. De préférence, au moins la couche extérieure est extrudée par une extrudeuse ayant un rapport de longueur de vis de moins de 10 par rapport à son plus grand diamètre.
Cassan Maclean
Uponor Innovation Ab
LandOfFree
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