TW289007B - Hot runner nozzle - Google Patents

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 comprises 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). An inner heat-conductive bush (40) is thermally insulated from the separating sleeve (36) by air gaps (53, 44) and by a supporting ring (56).