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Hot runner with variable pressrue drop

IP.com Disclosure Number: IPCOM000008045D
Publication Date: 2002-May-14

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention broadly relates to melt flow control in an injection molding system. In particular, this invention relates to an apparatus for use in a hot runner manifold melt channel for varying the pressure drop. The restriction is in the form of a translatable valve pin housed within the melt channel of the manifold melt channel. An advantage of this invention is that the melt is subjected to a relatively low shear rate increase, and thus less material degradation as the pressure drop occurs over a rather long melt channel length.