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Machine translation
1. (WO1980002008) METHOD FOR MAKING LIP TYPE SHAFT SEAL
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/002008    International Application No.:    PCT/US1980/000274
Publication Date: 02.10.1980 International Filing Date: 12.03.1980
IPC:
B29C 43/18 (2006.01), B29D 99/00 (2010.01), F16J 15/32 (2006.01)
Applicants:
Inventors:
Priority Data:
23141 23.03.1979 US
Title (EN) METHOD FOR MAKING LIP TYPE SHAFT SEAL
(FR) METHODE DE FABRICATION D"UN PRESSE-ETOUPE DU TYPE A LEVRE AYANT UN MANCHON EN RESINE
Abstract: front page image
(EN)A method for molding an annular lip type shaft seal (10) of the type having an annular elastomeric shaft seal element (12) and a resin liner (14) (preferably polytetrafluoroethylene) integrally molded therewith and bonded thereto, including providing a step or shoulder (36) on the mold core (26) to prevent the resin liner (14) from flowing axially beyond a predetermined location during molding. The method includes providing a certain range of acute angles "(Alpha)" between the shoulder surface (42) and the liner forming surface (38) of the mold core surface (34), and a certain range of shoulder heights "d" relative to the liner thickness "t", for various values of the initial viscosity of the elastomeric preform (18). The percentage of rejects due to undesired flow of the resin liner (14) during molding has been greatly reduced.
(FR)Methode de moulage d"un presse-etoupe du type a levre annulaire (10) ayant un element d"etancheite d"arbre annulaire, elastomere (12) et un manchon en resine (14) (de preference du polytetrafluorethylene) moule de maniere solidaire avec l"element d"etancheite et lie a celui-ci, consiste a former un epaulement (36) sur le noyau du moule (26) pour empecher le manchon de resine (14) de s"ecouler axialement au-dela d"un point predetermine pendant le moulage. La methode comprend la formation d"une certaine gamme d"angles aigus "(Alpha)" entre la surface d"epaulement (42) et la surface de formation du manchon (38) de la surface du noyau du moule (34), et une certaine gamme de hauteurs d"epaulement "d" par rapport a l"epaisseur du manchon "t" pour differentes valeurs de la viscosite initiale de la preforme elastomere (18). Le pourcentage de rejet du a un ecoulement indesirable du manchon de resine (14) pendant le moulage a ete considerablement reduit.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)