Abstract: An injection nozzle assembly, comprising: a nozzle housing; a nozzle tip having an inlet portion being contactable with the nozzle housing; and a tip retainer being movable relative to the nozzle housing between a first position, a second position and a third position.

Abstract: An injection nozzle assembly, comprising: a nozzle housing; a nozzle tip having an inlet portion being contactable with the nozzle housing; and a tip retainer being movable relative to the nozzle housing between a first position, a second position and a third position.

Abstract: A nozzle comprises a nozzle housing having a preload engagement surface, a nozzle tip, a tip retainer having a preload engagement surface that retains the nozzle tip against the nozzle housing, and a preload limiter gap between the tip retainer and the nozzle housing comprising a spaced distance between the preload engagement surfaces when the nozzle is in a first position and a second position that creates a desired amount of preload force P when the nozzle is in the second position. In another embodiment, a nozzle comprises a nozzle housing, a nozzle tip, and a tip retainer movable with respect to the nozzle tip along the nozzle housing and that retains the nozzle tip against the nozzle housing. A tapered interface disposed between the tip insert and the tip retainer at an angle greater than or less than 90 degrees with respect to a longitudinal axis of the nozzle.

Abstract: An improved injection molding method and valve gating system are provided for a mold cavity using a valve gated nozzle wherein a valve stem is stationary with respect to a nozzle and the mold gate may be positioned to move relative to the valve stem to open and close the gate.

Abstract: The injection nozzle includes a longitudinal flow channel, a plurality of angular channels extending from the longitudinal flow channel (1) in a first direction at an acute angle with respect to the longitudinal axis of the nozzle, and (2) in a second direction at an acute angle with respect to the first direction, an annular channel extending from the angular channels, and a passageway extending from the annular channel to the injection orifice, wherein the angular channels cause a swirling action in the annular channel to flush out resin from the annular channel.