Abstract: A casing (12) of an injection molding machine including at least one hot runner nozzle (10) retains the same by its shaft (20) which extends into a mold insert (16) and which supports at least one nozzle tip (50, 50') that projects over the shaft up to an article (K) to be molded. The mold insert includes an undercut (70) into which the nozzle tips (50, 50') are inserted by a two-step movement, viz. e.g. in a first direction (S) approximately parallel and then in a transversal direction (Q) relative to the axis (A) of a flow tube (22) that is heatable from its outside. The nozzle tips (50, 50') are fixed to a shaft foot portion (38) so as not to contact the casing (12) or a wall (17) of the mold insert (16). A peripheral step (34) centers the shaft (20) whose high-strength foot portion (38) heat-conductively retains the nozzle tips (50, 50'). A thermally separating sleeve (36 ) joined to the foot portion (38) is continued towards the casing (12) by a heat-conducting envelope tube (30).

Abstract: A hot runner nozzle (10) with lateral electrode terminals (28) has a broad flanged body (18) that continues as a thermally graded narrower shaft (20) through which a heatable flow tube (22) extends. Into its high-strength foot portion (38), at least one nozzle tip (50, 50') is insertable; a high-strength heat-conductive envelope tube (30) having a re-entrant outer shoulder (34) adjacent the casing (12) is joined to a separating sleeve (36) of the shaft (20). The lower end of a heating tube (26) is thermoconductively connected to a metal bush (40) whose upper portion is thermally insulated by air gaps (54, 44) from both the separating sleeve (36) and the heating tube (26). A supporting ring (56) of low heat conduction is mounted between axial faces of the heat-conductive bush (40) and the separating sleeve (36). The nozzle tips (50, 50') are form-fitted or welded to the foot portion (38) at an angle between 0.degree. and 90.degree. relative to the axis (A) of the shaft (20).

Abstract: A hot runner system (10) for injection molding which includes a block-shaped casing (12) with a bore (14) for facewise insertion of at least one cartridge-like unit (16) having a material flow tube (32) enclosed by a heating device (38), and by a thermoconductive casting (V), and opposite flow transfer openings (35, 36), there are radial supports (40) protruding over the outer diameter (D) of the cast body (30) with an engaging face that is recessed relative to the bore (14) and serves for form-fit to nozzles (11), further units (16), additional flow tubes (32), etc. the supporting element for the cast body (30) being symmetrically arranged in either axial direction to form hollow compartments, including thin spiders (49), ribs (50), supporting segments (51) and tube-type studs (68), axial abutting members (18, 19) providing for tight closure of the hot runner system (10).

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).