In situ low pressure gasket molding and method

F - Mech Eng,Light,Heat,Weapons – 16 – J

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F16J 15/10 (2006.01)

Patent

CA 2360846

A method for forming a gasket seal or transition fitting affixed to one of two parts to be joined in a gasketed joint by use of the gasket comprises providing a mold having a walled mold cavity, at least one of wall of the mold cavity being a junction surface of the one part and the remaining walls of the mold cavity being formed in a mold piece. The mold is closed by placing the mold piece over the junction surface of the one part to establish the mold cavity as a closed generally toroidal volume. A molten gasket-forming thermoplastic material is injected into the mold cavity to form the gasket, the thermoplastic material including a bonding agent for adhesively bonding the junction surface and the gasket. The thermoplastic material is cooled to solidify the gasket and affix it to the junction surface and the mold piece is removed.

L'invention concerne un procédé de formation d'un joint d'étanchéité (19), d'une garniture ou d'un raccord de transition fixé à une ou deux parties (10) à assembler dans un joint à garniture au moyen du joint d'étanchéité. Le procédé comprend l'étape consistant à fournir un moule (12) doté d'une cavité (13) à parois de la forme voulue pour le joint, au moins une paroi (18) de la cavité du moule servant de surface de jonction d'une partie et les parois restantes (14) de la cavité étant formées dans une pièce du moule. On ferme le moule en plaçant la pièce du moule sur la surface de jonction de ladite partie pour établir la cavité du moule formant un volume fermé, sensiblement en forme d'anneau. Une matière thermoplastique fondue formant le joint est ensuite injectée dans la cavité du moule de façon à former le joint. Cette matière thermoplastique contient un liant pour former une liaison adhésive entre la surface de jonction et le joint. La matière thermoplastique est refroidie afin de solidifier le joint et de le fixer sur la surface de jonction, la pièce du moule est ensuite retirée de la surface de jonction.

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