Valve pin bushing for an injection molding apparatus

A hot runner installable to a hot half of an injection molding apparatus. The hot runner comprising a manifold, a nozzle having a nozzle body and a nozzle channel running therethrough, and a valve pin bushing disposed in a bore in the nozzle body. The valve pin bushing including a body, a projecting...

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Bibliographische Detailangaben
1. Verfasser:	KUDCHADKAR, VIJAY
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A hot runner installable to a hot half of an injection molding apparatus. The hot runner comprising a manifold, a nozzle having a nozzle body and a nozzle channel running therethrough, and a valve pin bushing disposed in a bore in the nozzle body. The valve pin bushing including a body, a projecting portion and a bore extending therethrough to accommodate a valve pin, wherein the projecting portion extends to the nozzle channel to define an annular section of the nozzle channel. The upstream side of the projecting portion includes a flow restricer disposed in the annular section, wherein the downstream side of the reflecting portion includes a narrow portion. The flow restricter is separated from the nozzle channel by a gap that defines a restricted region and the narrow portion defines an unrestricted region of the annular section.