B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/708
B29C 57/02 (2006.01) B29C 37/00 (2006.01) B29C 45/26 (2006.01) B29C 45/44 (2006.01)
Patent
CA 1074519
ABSTRACT Undercut tubular synthetic plastic articles, such as fit- tings, are formed in the mold cavity of an injection molding machine on a two-piece core a tubular component of which is surrounded by the undercut portion of the article and a first smaller-diameter portion at one side of the undercut portion. A cylindrical compon- ent of the core slidably guides the tubular component and is sur- rounded by a second smaller-diameter portion of the article at the other side of the undercut portion. When the injection of plastic- ized material is completed, the housing of the mold is opened to expose the undercut portion and the first smaller-diameter portion of the article on the core, the first smaller-diameter portion and the undercut portion are heated to or maintained at a temperature at which they can undergo elastic deformation, and the tubular com- ponent is moved axially of the article and of the cylindrical com- ponent so that the first smaller-diameter portion of the article is expanded by an external ring-shaped projection which forms part of the tubular component and was surrounded by the undercut portion. The first smaller-diameter portion of the article thereupon con- tracts so that its inner diameter is again less than the inner di- ameter of the undercut portion. The article is allowed to harden prior to complete separation from the core, and the first smaller- diameter portion is held against excessive contraction during hard- ening of the article. - 1 -
258002
Anton Anger Maschinenbau G.m.b.h.
Na
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