B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/709
B29C 45/73 (2006.01) B29C 45/27 (2006.01)
Patent
CA 2037328
In a hot runner system for injection molding, a runner block (10) has a bore (14) in a casing (12) for facewise insertion of a heatable cartridge (16) comprising a core member (30) with an inside runner (34). A flow tube (32) having flow passages (35, 36) at its face ends and/or at its periphery carries an electrically insulated (39) heating coil (38) over- cast with a thermoconductive mass (V) containing aluminium. Abutting members (18) seal the runner block (10) axially. Spaced radial supports (40, 49, 69) project over the outer diameter (D) of the core member (30), hollows or recesses (41, 44) serving for minimum heat transfer at the bearing area. An outer sleeve body (20) of the flow tube (32) may have sections (21 to 24) with a recessed central portion (46) sealingly engaging a collar-type support (40). Narrow peripheral ribs (42, 50) axially separate ring pockets (41) and outer compartments or spaces (52). Overlaps (26) at joining gaps (25) of the sleeve sections (21 to 24) are self-closing under operational pressure. Annular chambers (54) at the cartridge outside remain free of plastics.
Dipl.-Ing. Herbert Gunther Gesellschaft Mbh
Fetherstonhaugh & Co.
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