B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
257/22
B29C 45/44 (2006.01) B29C 45/26 (2006.01) F28F 9/02 (2006.01) F28F 9/04 (2006.01) F28F 21/06 (2006.01)
Patent
CA 1298279
ABSTRACT OF THE DISCLOSURE A process for forming a plastic part having a tubular portion that is continuous and without any flash/mismatch due to mold parting lines in which an injec- tion mold is provided having a cavity formed with a cylindri- cal surface portion and a core member removably inserted endwise into the cylindrical portion. A molten plastic material is injected into the cavity so that it extends into the cylindrical portion and around the core member. The core member is then withdrawn in an axial direction from the cylindrical portion after the plastic material therein has solidified enough to retain its tubular shape but before it has completely cooled to thereby enable the plastic material to shrink radially inwardly away from the cylindrical surface. Thereafter, the molded tubular shape and the cylindrical mold surface are moved relative to each other in an axial direction so that they are moved away from each other and the tubular portion is withdrawn from the mold, with the tubular portion yielding or flexing to whatever extent is necessary in order to clear the mold.
549881
Johnson Service Company
Macrae & Co.
LandOfFree
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