Importance

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Abstract

A nozzle arrangement for a fluid assisted injection molding apparatus has a central passage connected to an injection molding machine at one end and a section of the passage forming an outer sleeve at its opposite end. A channel at the opposite end of the nozzle connects the outer sleeve with an inlet runner leading to the mold cavity through which plasticized resin material can be injected. A pressurized fluid conduit coaxial with the nozzle forms an inner sleeve movable into and out of telescoping engagement with the outer sleeve for respectively blocking and opening the connection between the outer sleeve and its connecting channel. The conduit has a connecting passage, and it central passage is closed at its inner end. The connecting passage connects the conduit central passage with the nozzle connecting channel upon the telescoping engagement of the sleeves during which communication between the nozzle connecting channel and the outer sleeve is blocked while communication between that connecting channel and the inner sleeve connecting channel is established. The inlet runner is therefore alternately connected with plasticized resin with pressurized gas respectively upon the estabtishing and blocking positions.

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First Claim