The invention relates to nozzle tips including a nozzle body and a tip portion, configured to minimize the accumulation of a resin on the nozzle tip as it is dispensed through the nozzle tip. The nozzle tip can contain a central flow channel and an internal portion that branches and guides the resin into multiple exiting flow channels that define tangential pathways to the outer surface of the nozzle tip. The nozzle tip can include grooves that define extended, sharply angled flow paths for the resin. Nozzle tips can have a neck portion separating a nozzle body and a tip end of the nozzle tip; here, a doughnut-shaped space located around the neck portion can be defined by the base of the nozzle, the crown of the nozzle, and the neck portion, for encouraging turbulent flow of the resin to scour the nozzle tip during dispensing.

A hotrunner assembly for an injection molding apparatus includes a hotrunner manifold, a nozzle for conveying liquid resin from an outlet of the hotrunner manifold, a valve pin linearly movable within and along a longitudinal axis of the nozzle to control flow of the liquid resin from the outlet of the hotrunner manifold, an actuator for driving the valve pin, a primary seal disposed radially between the valve pin and walls of a bore extending through the hotrunner manifold, and a secondary seal located axially between the hotrunner manifold and the actuator and circumscribing a section of the valve pin to prevent gases or liquid resin from contacting the actuator.

The invention relates to nozzle tips including a nozzle body and a tip portion, configured to minimize the accumulation of a resin on the nozzle tip as it is dispensed through the nozzle tip. The nozzle tip can contain a central flow channel and an internal portion that branches and guides the resin into multiple exiting flow channels that define tangential pathways to the outer surface of the nozzle tip. The nozzle tip can include grooves that define extended, sharply angled flow paths for the resin. Nozzle tips can have a neck portion separating a nozzle body and a tip end of the nozzle tip; here, a doughnut-shaped space located around the neck portion can be defined by the base of the nozzle, the crown of the nozzle, and the neck portion, for encouraging turbulent flow of the resin to scour the nozzle tip during dispensing.

A hotrunner assembly for an injection molding apparatus includes a hotrunner manifold, a nozzle for conveying liquid resin from an outlet of the hotrunner manifold, a valve pin linearly movable within and along a longitudinal axis of the nozzle to control flow of the liquid resin from the outlet of the hotrunner manifold, an actuator for driving the valve pin, a primary seal disposed radially between the valve pin and walls of a bore extending through the hotrunner manifold, and a secondary seal located axially between the hotrunner manifold and the actuator and circumscribing a section of the valve pin to prevent gases or liquid resin from contacting the actuator.

The invention relates to nozzle tips including a nozzle body and a tip portion, configured to minimize the accumulation of a resin on the nozzle tip as it is dispensed through the nozzle tip. The nozzle tip can contain a central flow channel and an internal portion that branches and guides the resin into multiple exiting flow channels that define tangential pathways to the outer surface of the nozzle tip. The nozzle tip can include grooves that define extended, sharply angled flow paths for the resin.

Nozzle tips can have a neck portion separating a nozzle body and a tip end of the nozzle tip; here, a doughnut-shaped space located around the neck portion can be defined by the base of the nozzle, the crown of the nozzle, and the neck portion, for encouraging turbulent flow of the resin to scour the nozzle tip during dispensing.

The invention relates to nozzle tips including a nozzle body and a tip portion, configured to minimize the accumulation of a resin on the nozzle tip as it is dispensed through the nozzle tip. The nozzle tip can contain a central flow channel and an internal portion that branches and guides the resin into multiple exiting flow channels that define tangential pathways to the outer surface of the nozzle tip. The nozzle tip can include grooves that define extended, sharply angled flow paths for the resin.

Nozzle tips can have a neck portion separating a nozzle body and a tip end of the nozzle tip; here, a doughnut-shaped space located around the neck portion can be defined by the base of the nozzle, the crown of the nozzle, and the neck portion, for encouraging turbulent flow of the resin to scour the nozzle tip during dispensing.

An injection molding apparatus for manufacturing hollow objects, such as plastic e.g. multi-layered preforms, comprising an injection mold (1) with a front (2) and a rear side (3), which is composed of a clamp plate (4) on the front side (2), and a hot runner plate (5), where a manifold (6) is mounted in the hot runner plate, between which a set of injection nozzles (7) is arranged, which are each provided with a central supply duct (8), at the free end (9) whereof an injection gate (10) is provided. Said apparatus is remarkable in that said injection gate (10) is closable by means of a locking rod (11), which is movable herein to and fro through a profiled inner part (12) which is received in a holder (13) around which a heating element (14) is provided into which a primary channel (15) opens for supplying the plastic base material to the injection gate (10). Each injection nozzle (7) is directly removable individually from the injection side (16) of the injection mold at the injection side thereof, and a respective secondary channel (17) is provided separately; and method therefor.

A hot runner injection molding apparatus to manufacture molded parts with a manifold having an inlet melt channel and a plurality of outlet melt channels, a plurality of injection molding cavities and a plurality of side gating nozzles coupled to the outlet melt channels and to the injection molding cavities. Each nozzle has a nozzle flange segment including a first melt channel disposed along a first axis and each side gating nozzle further includes a separate and removable nozzle head segment that is coupled to the flange segment via a sliding connector element that provides for an axial movement of the nozzle head segment or of the nozzle flange segment. Each nozzle head segment retains at least two nozzle tips that extend at least partially outside an outer surface of the nozzle head segment and each nozzle tip is surrounded by a nozzle seal element.