A strain gauge nozzle adapter that may be placed between a barrel end cap and a nozzle body of an injection molding system, the strain gauge nozzle adapter having a strain gauge pin that measures strain within the strain gauge nozzle adapter for use in approximating conditions within an injection molding system, such as pressure or the location of a melt flow front. The strain gauge nozzle adapter may include a plurality of strain gauge pins. An alternative material insert in the strain gauge nozzle adapter may surround a strain gauge pin to amplify meaningful measurements obtained by the strain gauge pin so that noise measurements do not compromise the accuracy of approximation of conditions within a mold.

To solve a problem associated with formation of a transparent window portion in a biaxially stretch blow molded container by a nozzle structure of an injection molding apparatus, provided is a biaxially stretch blow molded container formed with a clearly transparent window portion in longitudinal strip shape by effectively preventing mixture of colored resin to window portion. Injection molding apparatus includes in nozzle portion a longitudinal groove flow path, wherein a transparent B resin flows. By, for example, reducing and increasing, respectively, the width and depth of the longitudinal groove flow path on the downstream side, and engraving slits in an inner mandrel and even in a front end portion of a stopper pin, flowability of the B resin in a horizontal direction is enhanced.

In one aspect, a method of molding a multilayer article comprises causing a surface layer material injection unit to commence injecting a surface layer material into a mold cavity via a surface layer material channel. Then, an internal layer material injection unit commences injecting an internal layer material into the mold cavity an internal layer material channel. Then, during application of a hold pressure upon the surface layer material in the surface layer material channel and with the surface and internal layer material injection units in fluid communication with one another, a pullback stroke is effected at the internal layer material injection unit. After a delay interval, at least one physical parameter indicative of a post-pullback pressure of the internal layer material is detected, and an indicator of pullback effectiveness is generated based on the post-pullback pressure indicated by the at least one physical parameter relative to a threshold pressure.

For processing cost reduction and improvement of efficiency, a no-mold-runner multi-nozzle device, comprising: an injection machine, a multi-nozzle component, a front template, and a no-mold-runner. The multi-nozzle component includes a plurality of nozzles, which is connected to the injection machine. The injection machine is used to inject a mixture of molding material and supercritical fluid into multiple nozzles. The front template is provided with a plurality of first passage holes. The no-mold-runner is provided with a mold cavity and a plurality of second passage holes communicating with the mold cavity. The nozzle correspondingly passes through a plurality of first passage holes and second passage holes and is installed in cooperation. By controlling the opening or closing of the nozzle, the mixed material of the molding material and the supercritical fluid enters the mold cavity or stops entering the mold cavity.

A multi-component injection moulding machine provided has a machine bed, two mould mounting plates movable relative to one another by a closing unit, an injection unit and an extruder unit. The injection unit moves relative to the neighbouring mould mounting plate and has a nozzle having a nozzle head. The extruder unit is adjustable between a first position, where a nozzle contact of the extruder unit rests on the nozzle head, and a second position releasing the injection unit for contacting of the nozzle head on a tool mounted on the neighbouring mould mounting plate. In the first position, the extruder unit and the injection unit can be directly coupled, and the extruder unit has a coupling unit having a second clamping element cooperating mechanically with a clamping element on the injection unit such that the coupling device provides a pressing force of the nozzle head on the nozzle contact.

A co-injection nozzle for an injection moulding device for producing multi-layered injection-moulded products. The nozzle includes: a central bore; a valve needle for opening and closing a nozzle opening; an annular inner melt channel for the first melt; an annular central melt channel for a second melt; and an annular outer melt channel for the first melt. The inner, central and outer melt channels are fluidically combined in the region of the nozzle tip to form a concentrically-layered melt stream. The co-injection nozzle has a back-flow barrier, integrated into the central bore, for the second melt, this barrier formed by a cut-out in the valve needle and by a melt channel for the second melt, the channel penetrating the central bore. In the open position of the back-flow barrier, the cut-out is located such that the second melt can flow through the melt channel, whilst flowing in the central bore past the valve needle.

A co-injection hot runner nozzle comprises an inner melt flow channel and an annular outer melt flow channel that surrounds the inner melt flow channel. The inner and outer melt flow channels have a first common source. The nozzle further comprises an annular intermediate melt flow channel disposed between the inner and outer melt flow channels. The annular intermediate melt flow channel is at least partly defined by a plurality of spiral grooves, each spiral groove having a respective inlet and defining a helical flow path. Lands between adjacent spiral grooves increase in clearance in a downstream direction. An annular axial flow path is defined over the lands. A plurality of feeder channels having a second common source is configured to supply melt to the plurality of inlets of the spiral grooves. The relationship of feeder channels to spiral grooves may be one-to-one. The inlets may be longitudinal channels.

A co-injection nozzle for an injection moulding device for producing multi-layered injection-moulded products. The nozzle includes: a central bore; a valve needle for opening and closing a nozzle opening; an annular inner melt channel for the first melt; an annular central melt channel for a second melt; and an annular outer melt channel for the first melt, the inner, central and outer melt channels being fluidically combined in the nozzle tip to form a concentrically-layered melt stream. The nozzle further includes a nozzle body and a melt runner insert having the central bore of the nozzle. The melt runner insert has a circular cylindrical section, by which the insert is held in a central bore of the nozzle body. At least one distribution channel for the first melt and at least one distribution channel for the second melt are formed in the outer surface of the circular cylindrical section, with the distribution channels running substantially in the axial direction.

An injection molding machine includes a nozzle with a nozzle body having inner and outer flow channels, and at least one intermediate flow channel in between. A valve stem is slideable in the inner flow channel and moveable between open and closed positions. In a first closed position, the valve stem blocks an outlet of the inner flow channel but not outlets of the outer or at least one intermediate flow channels. In the open position, melt exiting the at least one intermediate flow channel simultaneously intersect melt exiting the outer and inner flow channels. The flow channels may be arranged concentrically. The outlets of the flow channel may be separated by a knife edge. The outlets of the flow channels may be adjacent to one another. The inner and outer flow channels may be substantially perpendicular to one another, but not to the at least one intermediate flow channel.

A co-injection hot runner nozzle comprises an inner melt flow channel and an annular outer melt flow channel that surrounds the inner melt flow channel. The inner and outer melt flow channels have a first common source. The nozzle further comprises an annular intermediate melt flow channel disposed between the inner and outer melt flow channels. The annular intermediate melt flow channel is at least partly defined by a plurality of spiral grooves, each spiral groove having a respective inlet and defining a helical flow path. Lands between adjacent spiral grooves increase in clearance in a downstream direction. An annular axial flow path is defined over the lands. A plurality of feeder channels having a second common source is configured to supply melt to the plurality of inlets of the spiral grooves. The relationship of feeder channels to spiral grooves may be one-to-one. The inlets may be longitudinal channels.