VERFAHREN ZUM FORMEN VON DICHTUNGSRINGEN UND NACH DIESEM VERFAHREN HERGESTELLTE RINGE.

摘要

1. Process for moulding seal rings of the kind comprising a frame (19), a sealing lip bonded to said frame and consisting of a body (21), particularly of elastomer material, and of an operative sealing bearing surface (20) in the form of a covering of low-friction material, particularly of a fluorinated resin such as in particular polytetrafluoroethylene, in which process a metal frame, an annular disc of low-friction material, and a material, particularly an elastomer material, intended to form the body of the sealing lip are introduced into a mould (1, 2) and, once the moulding has been effected, the moulded ring is ejected after the mould has been opened, and the excess portion of the lip is cut off, characterized by the fact that the frame (19) and the annular disc (20) of low-friction material are placed in position in the open mould (1, 2), the mould is closed in such a manner as to grip the disc between two facing parts (4, 11) of the mould over a width (C) amounting to between about 30% and 70% of the width of the disc, that the interior cavity of the mould is placed under vacuum, that the material, particularly elastomer material, intended to form the body of the sealing lip (21) is injected into said cavity, and that the excess portion of the lip is cut off, after ejection of the ring, in such a manner as to include at least the rim portion of the disc which was gripped on the closing of the mould.