Patent ID: 6648622
Filing Date: 2003-11-18
Classification: B29C

Abstract:
An injection molding apparatus for multi-layer molding comprising:a central melt channel having a first portion for flow of a first material, a second portion for flow of the first material and a second material, a flow extension connecting the first portion and the second portion, the flow extension having a flow opening, and at least a portion of the central melt channel being in a nozzle and in communication with a front opening in the nozzle; an annular ring channel around the central melt channel for flow of the second material, the annular ring channel being in communication with the flow opening of the flow extension; and an annular melt channel radially spaced from the central melt channel for flow of a third material, the annular melt channel being in communication with the central melt channel near the front opening in the nozzle; wherein the first and second materials flow together through the entire portion of the central melt channel in the nozzle.