Method and apparatus for the manufacture of a tube for...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 70/24 (2006.01) B29C 53/38 (2006.01) B29C 65/10 (2006.01) B29C 65/20 (2006.01) B29C 65/52 (2006.01) F16L 55/165 (2006.01) B29C 53/48 (2006.01) B29C 63/34 (2006.01) B29C 65/00 (2006.01)

Patent

CA 2230806

In the manufacture of a tube for lining pipelines and sewer systems from fiber materials which can be impregnated with a curable resin, the margins (6a, 6b) of fiber strips (6, 19) on the circumference of the tube are provided with at least one tightly bonded overlap area (7a, 7b) running lengthwise. To achieve a stable and elastic foreproduct for impregnation with resin, a) elastically expandable fiber materials are used for the fiber strips (6, 19),b) the margins (6a, 6b) of the fiber strips (6, 19) are bonded irreversibly to one another by a thermal process, by either b1) placing a curable resin between the margins (6a, 6b) and curing it by actinic radiation, or b2) the fiber materials are bonded to one another in the overlap area (7a, 7b) by superficial fusion and pressure. In this case the fiber materials have differentmelting temperatures on opposite faces and are heated at their surfaces in contact to a temperature that is between the melting temperatures of the two fiber materials.

Cette invention concerne la fabrication de tubes pour le revêtement intérieur de pipelines et tuyaux d'égout à partir de matériaux fibreux à être imprégnés de résine réticulable. Les marges (6a, 6b) des bandes de matériau fibreux (6, 19) entrant dans la fabrication du tube comportent au moins une zone (7a, 7b) où elles se chevauchent et forment un joint solide se prolongeant dans le sens de la longueur. Afin de donner une préforme d'imprégnation stable et élastique, a) les bandes de matériau fibreux (6,19) sont réalisées en fibres élastiques, b) les marges (6a, 6b) desdites bandes (6, 19) sont liaisonnées de façon irréversible par voie thermique faisant appel soit à b1) l'insertion d'une résine réticulable entre les marges (6a, 6b) et au bombardement actinique du joint ainsi formé, soit à b2) la fusion superficielle sous pression de la zone de chevauchement (7a, 7b). Dans ce dernier cas, les deux faces des bandes de matériau fibreux utilisées ont une température de fusion différente et elles sont chauffées à leur point de contact à une température comprise entre lesdites températures de fusion.

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