Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1991-03-04
1993-06-15
Reynolds, Bruce A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219544, 219424, 425549, 425DIG13, 26432814, H05B 344, B29B 700
Patent
active
052201546
ABSTRACT:
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) overcast 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.
REFERENCES:
patent: 3677682 (1972-07-01), Putkowski
patent: 3812228 (1974-05-01), Skoroszewski
patent: 4395222 (1983-07-01), Gaiser et al.
patent: 4770623 (1988-09-01), Gutjahr
patent: 4856979 (1989-08-01), Schreck
Herbert Gunther Gesellschaft mbH
Philpitt Fred
Reynolds Bruce A.
Switzer Michael D.
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