FLUID CHANNEL FLOW DISRUPTION

Abstract

An injection molding apparatus including an actuator interconnected to a rod or valve pin having a smooth continuous cylindrical outer surface and one or more discontinuous or relieved or relieved portions formed as discontinuities in the cylindrical outer surface and adapted to be disposed within a fluid flow channel, the one or more discontinuous or relieved portions being configured and arranged along the axial length of the pin or rod such that the flow of injection fluid over or past the one or more discontinuous or relieved portions is modified to flow at substantially different rates or velocities or in substantially different flow patterns relative to rate or velocity or pattern of flow of injection fluid over or past the smooth continuous cylindrical outer surface.

Claims

1. An injection molding apparatus comprising an injection molding machine, a manifold that receives injection fluid from the machine and routes the injection fluid through a distribution channel from an upstream end toward a downstream end of a fluid flow channel that is disposed in the manifold or a nozzle communicating with the distribution channel of the manifold, the fluid flow channel having a channel length and having a generally straight channel section extending a downstream portion of the channel length along which the injection fluid flows from the distribution channel through the fluid flow channel to a gate to a mold cavity, the fluid flow channel mating at the downstream end with the gate to the cavity, the apparatus including an actuator interconnected to a rod or pin having an axis having an axial length, the actuator and the rod or pin being adapted to enable the pin or rod to be mounted such that that the rod or pin is disposed and drivable by the actuator reciprocally through a path of upstream downstream travel within the fluid flow channel wherein the pin or rod is drivable to a downstream-most position where a distal tip end of the pin or rod closes the gate off from flow of injection fluid through the gate, the rod or pin having a smooth continuous cylindrical outer surface, the rod or pin including one or more discontinuous or relieved or relieved portions formed as discontinuities in the cylindrical outer surface, the one or more discontinuous or relieved portions extending axially along one or more selected portions of the axial length of the rod or pin, the actuator and the rod or pin being adapted to mount the rod or pin such that the rod or pin is prevented from rotating around the axis of the rod or pin, the actuator and the rod or pin being adapted to mount the rod or pin such that the one or more discontinuous or relieved portions are disposed within the fluid flow channel, the one or more discontinuous or relieved portions being configured and arranged along the axial length of the pin or rod such that the flow of injection fluid over or past the one or more discontinuous or relieved portions disposed in the straight section is modified to flow at substantially different rates or velocities or in substantially different flow patterns relative to rate or velocity or pattern of flow of injection fluid over or past the smooth continuous cylindrical outer surface.

2. The apparatus of claim 1 wherein the one or more discontinuous or relieved portions are formed into the smooth cylindrical outer surface in a configuration having a generally flat, planar concave or convex surface.

3. The apparatus of claim 1 wherein the fluid flow channel includes a curved or arcuate portion communicating flow of the injection fluid from the distribution channel through and along the channel length of the fluid flow channel to the gate, the actuator and the rod or pin being adapted to mount the rod or pin such that a discontinuous or relieved portion of the rod or pin is disposed within the curved or arcuate portion of the fluid flow channel over the course of at least a portion of the reciprocal upstream downstream path of travel of the valve pin.

4. The apparatus of claim 1 wherein the distribution channel has a second axis disposed at an angle to the primary axis of the fluid flow channel, the arcuate portion of the fluid flow channel routing injection fluid from the distribution channel through an arcuate or curved path over the discontinuous or relieved portion of the rod or pin disposed within the curved or arcuate portion over the course of at least a portion of the upstream downstream path of travel of the valve pin.

5. The apparatus of claim 1 wherein one or more of the discontinuous or relieved portions have two or more generally flat, planar, concave or convex surfaces disposed at a non-planar angle relative to each other.

6. The apparatus of claim 1 wherein two or more successive discontinuous or relieved portions each have a generally flat, planar, concave or convex surface disposed at a non-planar angle relative to each other.

7. The apparatus of claim 1 wherein the discontinuous or relieved portions are formed into the smooth continuous cylindrical outer surface as discontinuities comprising one or more of protrusions, grooves, spiral grooves, spiral grooves, spiral grooves, flats, concave surfaces, convex surfaces, dimples, projections, fins or apertures.

8. The apparatus of claim 1 wherein the fluid flow channel has a minimum radial diameter and the pin or rod has a maximum radial diameter that is less than the minimum radial diameter of the fluid flow channel in which the pin or rod is disposed such that a flow space is disposed between the discontinuous or relieved portion of the outer circumferential surface of the pin or rod and an interior surface of the flow channel in which the pin or rod is disposed.

9. A method of injecting fluid into a mold cavity comprising injecting an injection fluid into the fluid distribution channel and fluid flow channel of an apparatus according to claim 1 and controllably operating the actuator to enable the injection fluid to be injected into the mold cavity.

10. A method of injecting fluid into a mold cavity of an injection molding apparatus comprising an injection molding machine, a manifold that receives injection fluid from the machine and routes the injection fluid through a distribution channel from an upstream end toward a downstream end of a fluid flow channel that is disposed in the manifold or a nozzle communicating with the distribution channel of the manifold, wherein the fluid flow channel has a channel length and has a generally straight channel section extending a downstream portion of the channel length along which the injection fluid flows from the distribution channel through the fluid flow channel to a gate to the mold cavity, the fluid flow channel mating at the downstream end with the gate to the cavity, the apparatus including an actuator interconnected to a rod or pin having an axis having an axial length, the actuator and the rod or pin being adapted to enable the pin or rod to be mounted such that that the rod or pin is disposed and drivable by the actuator reciprocally through a path of upstream downstream travel within the fluid flow channel wherein the pin or rod is drivable to a downstream-most position where a distal tip end of the pin or rod closes the gate off from flow of injection fluid through the gate, the method comprising: selecting a rod or pin having a smooth continuous cylindrical outer surface and one or more discontinuous or relieved portions formed as discontinuities in the cylindrical outer surface, the one or more discontinuous or relieved portions extending axially along one or more selected portions of the axial length of the rod or pin, mounting the rod or pin such that the rod or pin is prevented from rotating around the axis of the rod or pin, mounting the rod or pin such that the one or more discontinuous or relieved portions are disposed within the fluid flow channel, injecting injection fluid from the fluid distribution channel to flow through the fluid flow channel, wherein the one or more discontinuous or relieved portions are configured and arranged along the axial length of the pin or rod such that the flow of injection fluid over or past the one or more discontinuous or relieved portions disposed in the straight section is modified to flow at substantially different rates or velocities or in substantially different flow patterns relative to rate or velocity or pattern of flow of injection fluid over or past the smooth continuous cylindrical outer surface.

11. The method of claim 10 wherein the fluid flow channel includes a curved or arcuate portion communicating flow of the injection fluid from the distribution channel through and along the channel length of the fluid flow channel to the gate, the actuator and the rod or pin being adapted to mount the rod or pin such that a discontinuous or relieved portion of the rod or pin is disposed within the curved or arcuate portion of the fluid flow channel over the course of at least a portion of the reciprocal upstream downstream path of travel of the valve pin.

12. The method of claim 10 wherein the distribution channel has a second axis disposed at an angle to the primary axis of the fluid flow channel, the arcuate portion of the fluid flow channel routing injection fluid from the distribution channel through an arcuate or curved path over the discontinuous or relieved portion of the rod or pin disposed within the curved or arcuate portion over the course of at least a portion of the upstream downstream path of travel of the valve pin.

13. An injection molding apparatus comprising an injection molding machine, a manifold that receives injection fluid from the machine and routes the injection fluid through a distribution channel from an upstream end toward a downstream end of a fluid flow channel that is disposed in the manifold or a nozzle communicating with the distribution channel of the manifold, the fluid flow channel having a channel length and having a generally straight channel section extending a downstream portion of the channel length along which the injection fluid flows from the distribution channel through the fluid flow channel to a gate to a mold cavity, the fluid flow channel mating at the downstream end with the gate to the cavity, the apparatus including an actuator interconnected to a rod or pin having an axis having an axial length, the actuator and the rod or pin being adapted to enable the pin or rod to be mounted such that that the rod or pin is disposed and drivable by the actuator reciprocally through a path of upstream downstream travel within the fluid flow channel wherein the pin or rod is drivable to a downstream-most position where a distal tip end of the pin or rod closes the gate off from flow of injection fluid through the gate, the rod or pin having a smooth continuous cylindrical outer surface, the rod or pin including one or more discontinuous or relieved or relieved portions formed as discontinuities in the cylindrical outer surface, the one or more discontinuous or relieved portions extending axially along one or more selected portions of the axial length of the rod or pin, the one or more discontinuous or relieved portions being formed into the smooth cylindrical outer surface in a configuration having a generally flat, planar, concave or convex surface, the actuator and the rod or pin being adapted to mount the rod or pin such that the rod or pin is prevented from rotating around the axis of the rod or pin, the actuator and the rod or pin being adapted to mount the rod or pin such that the one or more discontinuous or relieved portions are disposed within the fluid flow channel, the one or more discontinuous or relieved portions being configured and arranged along the axial length of the pin or rod such that the flow of injection fluid over or past the one or more discontinuous or relieved portions disposed in the straight section is modified to flow at substantially different rates or velocities or in substantially different flow patterns relative to rate or velocity or pattern of flow of injection fluid over or past the smooth continuous cylindrical outer surface.

14. The apparatus of claim 13 wherein the fluid flow channel includes a curved or arcuate portion communicating flow of the injection fluid from the distribution channel through and along the channel length of the fluid flow channel to the gate, the actuator and the rod or pin being adapted to mount the rod or pin such that a discontinuous or relieved portion of the rod or pin is disposed within the curved or arcuate portion of the fluid flow channel over the course of at least a portion of the reciprocal upstream downstream path of travel of the valve pin.

15. The apparatus of claim 13 wherein the distribution channel has a second axis disposed at an angle to the primary axis of the fluid flow channel, the arcuate portion of the fluid flow channel routing injection fluid from the distribution channel through an arcuate or curved path over the discontinuous or relieved portion of the rod or pin disposed within the curved or arcuate portion over the course of at least a portion of the upstream downstream path of travel of the valve pin.

16. The apparatus of claim 13 wherein one or more of the discontinuous or relieved portions have two or more generally flat, planar, concave or convex surfaces disposed at a non-planar angle relative to each other.

17. The apparatus of claims 13 wherein two or more successive discontinuous or relieved portions each have a generally flat, planar, concave or convex surface disposed at a non-planar angle relative to each other.

18. The apparatus of claim 13 wherein the fluid flow channel has a minimum radial diameter and the pin or rod has a maximum radial diameter that is less than the minimum radial diameter of the fluid flow channel in which the pin or rod is disposed such that a flow space is disposed between the discontinuous or relieved portion of the outer circumferential surface of the pin or rod and an interior surface of the flow channel in which the pin or rod is disposed.

19. A method of injecting fluid into a mold cavity comprising injecting an injection fluid into the fluid distribution channel and fluid flow channel of an apparatus according to claim 13 and controllably operating the actuator to enable the injection fluid to be injected into the mold cavity.

20. A method of injecting fluid into a mold cavity of an injection molding apparatus comprising an injection molding machine, a manifold that receives injection fluid from the machine and routes the injection fluid through a distribution channel from an upstream end toward a downstream end of a fluid flow channel that is disposed in the manifold or a nozzle communicating with the distribution channel of the manifold, wherein the fluid flow channel has a channel length and has a generally straight channel section extending a downstream portion of the channel length along which the injection fluid flows from the distribution channel through the fluid flow channel to a gate to the mold cavity, the fluid flow channel mating at the downstream end with the gate to the cavity, the apparatus including an actuator interconnected to a rod or pin having an axis having an axial length, the actuator and the rod or pin being adapted to enable the pin or rod to be mounted such that that the rod or pin is disposed and drivable by the actuator reciprocally through a path of upstream downstream travel within the fluid flow channel wherein the pin or rod is drivable to a downstream-most position where a distal tip end of the pin or rod closes the gate off from flow of injection fluid through the gate, the method comprising: selecting a rod or pin having a smooth continuous cylindrical outer surface and one or more discontinuous or relieved portions formed as generally flat, planar, concave or convex surfaces in the cylindrical outer surface, the one or more discontinuous or relieved portions extending axially along one or more selected portions of the axial length of the rod or pin, mounting the rod or pin such that the rod or pin is prevented from rotating around the axis of the rod or pin, mounting the rod or pin such that the one or more discontinuous or relieved portions are disposed within the fluid flow channel, injecting injection fluid from the fluid distribution channel to flow through the fluid flow channel, wherein the one or more discontinuous or relieved portions are configured and arranged along the axial length of the pin or rod such that the flow of injection fluid over or past the one or more discontinuous or relieved portions disposed in the straight section is modified to flow at substantially different rates or velocities or in substantially different flow patterns relative to rate or velocity or pattern of flow of injection fluid over or past the smooth continuous cylindrical outer surface.

21. The method of claim 20 wherein the fluid flow channel includes a curved or arcuate portion communicating flow of the injection fluid from the distribution channel through and along the channel length of the fluid flow channel to the gate, the actuator and the rod or pin being adapted to mount the rod or pin such that a discontinuous or relieved portion of the rod or pin is disposed within the curved or arcuate portion of the fluid flow channel over the course of at least a portion of the reciprocal upstream downstream path of travel of the valve pin.

22. The method of claim 20 wherein the distribution channel has a second axis disposed at an angle to the primary axis of the fluid flow channel, the arcuate portion of the fluid flow channel routing injection fluid from the distribution channel through an arcuate or curved path over the discontinuous or relieved portion of the rod or pin disposed within the curved or arcuate portion over the course of at least a portion of the upstream downstream path of travel of the valve pin.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0136] The above and further advantages of the invention may be better understood by referring to the following description in conjunction with the accompanying drawings in which:

[0137] FIG. 1A is a perspective view of one embodiment of a flow disrupting rod, pin or shaft having a flat groove or recess formed into the normally continuous smooth circumferential surface of a cylindrical rod or pin.

[0138] FIG. 1B is a side view of the FIG. 1A rod.

[0139] FIG. 1E is a sectional view along lines 1E-1E of FIG. 1B.

[0140] FIG. 1AA is a perspective view of another embodiment of a flow disrupting rod, pin or shaft having a concave surface indentation formed into the normally continuous smooth circumferential surface of a cylindrical rod or pin.

[0141] FIG. 1EE is a sectional view along lines 1EE-1EE of FIG. 1AA.

[0142] FIG. 1AAA is a perspective view of another embodiment of a flow disrupting rod, pin or shaft having a convex surface formed into the normally continuous smooth circumferential surface of a cylindrical rod or pin.

[0143] FIG. 1EEE is a sectional view along lines 1EEE-1EEE of FIG. 1AAA.

[0144] FIG. 1C is side cross-sectional view of the heated distribution manifold and associated nozzle and mold plate components of an injection molding system showing the FIGS. 1A, 1B rod or pin from a side view disposed coaxially within the flow channel of the nozzle whose distal end gate mates with the gate to a mold.

[0145] FIG. 1D is an end sectional view of the system components of FIG. 10 showing the rod or pin from an end view.

[0146] FIG. 2A is a perspective view of another embodiment of a flow disrupting rod, pin or shaft having a pair of flats formed at another position along the axial length of the rod or pin into the normally continuous smooth circumferential surface of an otherwise cylindrical rod or pin.

[0147] FIG. 2B is a side view of the FIG. 2A rod.

[0148] FIG. 2E is sectional view taken along lines 2E-2E of FIG. 2B.

[0149] FIG. 2C is side cross-sectional view of the heated distribution manifold and associated nozzle and mold plate components of an injection molding system showing the FIGS. 2A, 2B rod or pin from a side view disposed coaxially within the flow channel of the nozzle whose distal end gate mates with the gate to a mold.

[0150] FIG. 2D is an end sectional view of the system components of FIG. 2C showing the rod or pin from an end view.

[0151] FIG. 3A is a side view of another embodiment of a flow disrupting rod, pin or shaft having multiple dimples formed into the normally continuous smooth circumferential surface of an otherwise cylindrical rod or pin.

[0152] FIG. 3B is a perspective view of the FIG. 3A rod.

[0153] FIG. 3E is an enlarged view of a portion of the dimpled surface of the FIGS. 3A, 3B rod or pin taken within circle 3E-3E of FIG. 3B.

[0154] FIG. 3C is side cross-sectional view of the heated distribution manifold and associated nozzle and mold plate components of an injection molding system showing the FIGS. 3A, 3B rod or pin from a side view disposed coaxially within the flow channel of the nozzle whose distal end gate mates with the gate to a mold.

[0155] FIG. 3D is an end sectional view of the system components of FIG. 1C showing the rod or pin from an end view.

[0156] FIG. 4A is a perspective view of one embodiment of a flow disrupting rod, pin or shaft having a pair of 180 degree opposing flats or flat grooves or recesses formed into the normally continuous smooth circumferential surface of an otherwise cylindrical rod or pin.

[0157] FIG. 4B is a side view of the FIG. 1A rod.

[0158] FIG. 4E is a sectional view taken along lines 4E-4E of FIG. 4B.

[0159] FIG. 4C is side cross-sectional view of the heated distribution manifold and associated nozzle and mold plate components of an injection molding system showing the FIGS. 4A, 4B rod or pin from a side view disposed coaxially within the flow channel of the nozzle whose distal end gate mates with the gate to a mold.

[0160] FIG. 4D is an end sectional view of the system components of FIG. 4C showing the rod or pin from an end view.

[0161] FIG. 5A is a side view of another embodiment of a flow disrupting rod, pin or shaft having multiple flats or flat grooves or recesses formed along multiple selected lengths along the axis of the rod or pin, the flats or grooves being formed into the normally continuous smooth circumferential surface of an otherwise cylindrical rod or pin.

[0162] FIG. 5B is a perspective view of the FIG. 5A rod.

[0163] FIG. 5E is sectional view taken along lines 5E-5E of FIG. 5B.

[0164] FIG. 5C is side cross-sectional view of the heated distribution manifold and associated nozzle and mold plate components of an injection molding system showing the FIGS. 5A, 5B rod or pin from a side view disposed coaxially within the flow channel of the nozzle whose distal end gate mates with the gate to a mold.

[0165] FIG. 5D is an end sectional view of the system components of FIG. 5C showing the rod or pin from an end view.

[0166] FIG. 6A is a side view of another embodiment of a flow disrupting rod, pin or shaft having multiple graduated reduced diameter grooves formed at multiple locations along the axial length of the rod or pin, the grooves being formed into the normally continuous smooth circumferential surface of an otherwise cylindrical rod or pin.

[0167] FIG. 6B is a perspective view of the FIG. 6A rod.

[0168] FIG. 6E is sectional view taken along lines 6E-6E of FIG. 6B.

[0169] FIG. 6C is side cross-sectional view of the heated distribution manifold and associated nozzle and mold plate components of an injection molding system showing the FIGS. 6A, 6B rod or pin from a side view disposed coaxially within the flow channel of the nozzle whose distal end gate mates with the gate to a mold.

[0170] FIG. 6D is an end sectional view of the system components of FIG. 6C showing the rod or pin from an end view.

[0171] FIG. 7A is a side view of another embodiment of a flow disrupting rod, pin or shaft having an elongated flat or flat groove or recess formed into the normally continuous smooth circumferential surface of a cylindrical rod or pin.

[0172] FIG. 7B is a perspective view of the FIG. 7A rod.

[0173] FIG. 7E is sectional view taken along lines 7E-7E of FIG. 7B.

[0174] FIG. 7C is side cross-sectional view of the heated distribution manifold and associated nozzle and mold plate components of an injection molding system showing the FIGS. 7A, 7B rod or pin from a side view disposed coaxially within the flow channel of the nozzle whose distal end gate mates with the gate to a mold.

[0175] FIG. 7D is an end sectional view of the system components of FIG. 7C showing the rod or pin from an end view.

[0176] FIG. 8A is a side view of another embodiment of a flow disrupting rod, pin or shaft having a spiral groove or recess formed into the normally continuous smooth circumferential surface of an otherwise cylindrical rod or pin.

[0177] FIG. 8B is a perspective view of the FIG. 8A rod.

[0178] FIG. 8E is sectional view taken along lines 8E-8E of FIG. 8B.

[0179] FIG. 8C is side cross-sectional view of the heated distribution manifold and associated nozzle and mold plate components of an injection molding system showing the FIGS. 8A, 8B rod or pin from a side view disposed coaxially within the flow channel of the nozzle whose distal end gate mates with the gate to a mold.

[0180] FIG. 8D is an end sectional view of the system components of FIG. 8C showing the rod or pin from an end view.

[0181] FIG. 9A is a top perspective view of an embodiment of a plug or insert to a fluid flow channel, the plug or insert having shortened internally downstream mountable flow disrupting rod, pin or shaft having a flat groove or recess formed into the normally continuous smooth circumferential surface of the downstream rod or stem portion of the device (not shown in the rear side orientation of FIG. 9A.

[0182] FIG. 9B is a side view of the FIG. 9A plug or insert showing the rod or pin turned 90 degrees relative to the view shown in FIG. 9A showing the flat groove or recess formed into the normally continuous smooth circumferential surface of an otherwise cylindrical rod or stem portion of the device.

[0183] FIG. 9E is a top plan view of the FIG. 9A plug or insert.

[0184] FIG. 9C is side cross-sectional view of the heated distribution manifold and associated nozzle and mold plate components of an injection molding system showing the FIGS. 9A, 9B plug or insert with rod or pin from a side view disposed coaxially within the flow channel of the nozzle whose distal end gate mates with the gate to a mold.

[0185] FIG. 9D is an end sectional view of the system components of FIG. 9C showing the rod or pin from an end view.

[0186] FIG. 10 is a side sectional view of a section of a heated manifold flow channel showing the pattern and velocity of flow of injection fluid through the upstream end of the curved and straight portions of a downstream fluid flow channel having a smooth cylindrical controllably driven rod or pin without any flow disruption discontinuous portions formed in the otherwise smooth outer circumferential surface, the rod or pin extending through a manifold channel section and further coaxially extending downstream through the straight section of the fluid flow channel of a nozzle.

[0187] FIG. 11 is a side sectional view of a section of a heated manifold flow channel showing the pattern and velocity of flow of injection fluid through the upstream end of the curved and straight portions of a downstream fluid flow channel having a controllably driven rod or pin that has a flat surfaced discontinuity formed into the otherwise smooth outer circumferential surface (such as the discontinuity shown in FIGS. 7A-7D) the rod or pin extending through a manifold channel section and further coaxially extending downstream through the straight section of the fluid flow channel of a nozzle.

[0188] FIG. 12 is a side sectional view of a section of a heated manifold flow channel showing the pattern and velocity of flow of injection fluid through the upstream end of the curved and straight portions of a downstream fluid flow channel having a controllably driven rod or pin that has a flat surfaced discontinuity formed into the otherwise smooth outer circumferential surface (such as the discontinuity shown in FIGS. 7A-7D) the rod or pin extending through a manifold channel section and further coaxially extending downstream through the straight section of the fluid flow channel of a nozzle.

[0189] FIG. 13 is a side sectional view of a section of a heated manifold flow channel showing the pattern and velocity of flow of injection fluid through the upstream end of the curved and straight portions of a downstream fluid flow channel having a controllably driven rod or pin that has a sequential cylindrical groove discontinuities formed into the otherwise smooth outer circumferential surface (such as the discontinuities shown in FIGS. 6A-6D) the rod or pin extending through a manifold channel section and further coaxially extending downstream through the straight section of the fluid flow channel of a nozzle.

[0190] FIG. 14 is a schematic cross-sectional view of one embodiment of the invention showing a linear actuator assembled together with a rotary actuator such that the rotary actuator together with a valve pin attached to the rotor of the linear actuator both move translationally together with the piston of the actuator.

[0191] FIG. 15 is an enlarged detail view of a portion of FIG. 14 showing in greater detail the mounting of the rotary actuator to the piston of the linear actuator.

DETAILED DESCRIPTION

[0192] FIGS. 10, 1D, 2C, 2D, 3C, 3D, 4C, 4D, 5C, 5D, 6C, 6D, 7C, 7D, 8C, 8D, 9C, 9D all show an injection molding system 100 comprised of an injection molding machine 110 that injects fluid material 60 under pressure at high temperature through an inlet into an upstream end of a distribution flow channel to downstream distribution channel 40c disposed in a hotrunner or manifold 40 that routes the injection fluid to the bore or flow channel 200 of a nozzle 30 having a terminal downstream aperture or gate 70 that communicates with the cavity 80 of a mold 85 such that when the gate 70 is open injection fluid flows downstream into the cavity 80.

[0193] Preferably at least one actuator 55 is interconnected to the pins or rods 10, 12, 14, 16, 18, 20, 22, 24, 26, FIGS. 1A-9D so as to drive the pins or rods reciprocally upstream downstream UD around their axes A.

[0194] The linear actuator 55 typically includes a linear driver or piston that is controllably drivable in an upstream-downstream UD reciprocal manner along axis A that is in-line with the flow channel or bore 200 of the nozzle 30 is mounted in a stationary position relative to either a top clamp plate or the manifold. The linear actuator 55 can comprise a fluid driven device typically either hydraulic (such as oil) or pneumatic (such as air) driven where a piston is housed within the sealed bore of a cylinder and driven by controllable pumping of the fluid into and out of upstream and downstream drive chambers within the cylinder that houses the piston. The piston is prevented from rotating in the cylinder. And, as described below, the valve pin or rod 10, 12, 14, 16, 18, 20, 22, 24, 26 is preferably interconnected to the piston of the actuator 55 such that the valve pin or rod is non-rotatable or prevented from rotating. Thus rotation of the pin or rod 10, 12, 14, 16, 18, 20, 22, 24, 26 does not contribute to any disruption of the flow of injection fluid along the length L of the pin or rod during the course of an injection cycle.

[0195] Where the pin or rod 10, 12, 14, 16, 18, 20, 22, 24, 26 is driven by an actuator 55, the pin or rod moves or translates in unison axially A with axial movement of the piston and any rotary actuator that may be included. The distal tip end of the valve pin or rod is typically moved axially into and out of a closed gate position during the course of an injection cycle axial movement A of piston, actuator and its interconnected valve pin or rod.

[0196] The pins or rods 10, 12, 14, 16, 18, 20, 22, 24, 26 preferably have a maximum radial diameter PRD, FIGS. 1C, 1D, that is less than the minimum radial diameter CRD, FIG. 1D, of the fluid flow channel 200 in which the pin or rod is disposed such that a space S, FIG. 10, is disposed between the outer circumferential surface OS of the pin or rod and the interior circumferential surface IS of the flow channel 200 in which the pin or rod is disposed, the space S allowing injection fluid 60 to flow along the outer circumferential surface OS of the pin or rod from upstream toward downstream.

[0197] In all of the embodiments shown in FIGS. 1-15, the downstream flow channel 200 has an axial A channel length LL extending from an upstream end UE to a downstream end DE. The channel 200 has a curved or arcuate portion 200a that interconnects a manifold distribution channel 40c to the arcuate portion 200a of the channel 200 that terminates in at the gate 70 to the mold cavity 80. The channel 200 has an axially straight section SS that extends a downstream portion DP of the overall channel length LL. As described below with reference to FIGS. 10-13, the recesses, relieved portions, bores or discontinuities that are provided in the pins or rods are configured and arranged along the axial length L of a pin or rod such that the flow of injection fluid over or past the one or more discontinuous or relieved portions disposed in the straight section SS is modified to flow at substantially different rates or velocities or in substantially different flow patterns relative to rate or velocity or pattern of flow of injection fluid over or past the smooth continuous cylindrical outer suface (OS).

[0198] Each of the pins or rods 10, 12, 14, 16, 18, 20, 22, 24, 26 has an axial pin length L. Most preferably, the discontinuous or relieved portion (10a, 12a, 12b, 16a, 16b, 18a, 18b, 18c, 22a) of the rod or pin is disposed within the curved or arcuate portion (200a) of the fluid flow channel (200) over the course of at least a portion of the reciprocal upstream downstream (UD) path of travel of the valve pin.

[0199] FIGS. 1A, 1B, 1C, 1D show one embodiment of a pin 10 configuration having a recess, relieved portion, bore or discontinuity (or discontinuous portion) 11 in the form of a substantially flat surface 10a being formed into the otherwise smooth continuous outer cylindrically shaped surface OS of the pin or rod 10. As shown the recess 11 extends a relatively short distance SD along the axial length L of the pin 10.

[0200] FIGS. 1AA, 1EE show another embodiment of a pin 10 configuration having a recess, relieved portion, bore or discontinuity 11 in the form of a substantially concave surface 10aa being formed into the otherwise smooth continuous outer cylindrically shaped surface OS of the pin or rod 10. As shown the recess 11 extends a relatively short distance SD along the axial length L of the pin 10.

[0201] FIGS. 1AAA, 1EEE show another embodiment of a pin 10 configuration having a recess, relieved portion, bore or discontinuity 11 in the form of a substantially convex surface 10aaa being formed into the otherwise smooth continuous outer cylindrically shaped surface OS of the pin or rod 10. As shown the recess 11 extends a relatively short distance SD along the axial length L of the pin 10.

[0202] FIGS. 2A-2D show another embodiment of a pin 12 configuration having a relieved portion, discontinuous portion, discontinuity, recess or bore 13 in the form of a pair of flat surfaces 12a, 12b being formed into the otherwise smooth continuous outer cylindrically shaped surface OS of the pin or rod 12. As shown the recess 13 extends a relatively short distance SD along the axial length L of the pin 10.

[0203] FIGS. 3A-3D show another embodiment of a pin 14 configuration having a discontinuity 15 in the form of multiple dimples 14a being formed into the otherwise smooth continuous outer cylindrically shaped surface OS of the pin or rod 14. As shown the discontinuity 15 extends an extended relatively long distance ED, FIG. 3B, along the axial length L of the pin 14.

[0204] FIGS. 4A-4D show another embodiment of a pin 16 configuration having double recesses or bores or discontinuities 17 in the form of a pair of 180 degree opposing flat surfaces 16a, 16b being formed into the otherwise smooth continuous outer cylindrically shaped surface OS of the pin or rod 16. As shown the recesses 17 extend a relatively extended distance ED along the axial length L of the pin 16.

[0205] FIGS. 5A-5D show another embodiment of a pin 18 configuration having a series of sequentially disposed recesses or bores or discontinuities 19 in the form of flat surfaces 18a, 18b being formed on 180 degree radially opposing sides into the otherwise smooth continuous outer cylindrically shaped surface OS of the pin or rod 10. As shown the recesses 19 extend a relatively short distance SD in axially sequential locations along the axial length L of the pin 18.

[0206] FIGS. 6A-6D show another embodiment of a pin 20 configuration having multiple recesses or bores or discontinuities 21 formed sequentially along the axial length of the pin 20 in the form of radially reduced in diameter cylindrical necks or graduations 20a, 20b, 20c being formed into the otherwise smooth continuous outer cylindrically shaped surface OS of the pin or rod 20. As shown each of the successive recesses 21 extend a relatively short distance SD along the axial length L of the pin 10, the entire sequence extending an extended distance ED.

[0207] FIGS. 7A-7D show another embodiment of a pin 22 configuration having a relieved portion, discontinuous portion, discontinuity, recess or bore 23 in the form of a flat surface 22a being formed into the otherwise smooth continuous outer cylindrically shaped surface OS of the pin or rod 22. As shown the recess 11 extends an extended relatively long distance ED along the axial length L of the pin 22.

[0208] FIGS. 8A-D show another embodiment of a pin 24 configuration having a spiral relieved portion, discontinuous portion, discontinuity, recess or bore 25 in the form of a spirally shaped curved or curvilinear surface 24a being formed into the otherwise smooth continuous outer cylindrically shaped surface OS of the pin or rod 10. As shown the recess 25 extends an extended relatively long distance ED along the axial length L of the pin 24.

[0209] FIGS. 9A-9D show another embodiment of an insert or pin or rod 26 configuration having a relieved portion, discontinuous portion, discontinuity, recess or bore 27 in the form of a flat surface 26a being formed into the otherwise smooth continuous outer cylindrically shaped surface OS of the pin or rod 26. The insert or pin or rod 26 has a larger diameter head 26w with an outer circumferential surface 26s that mates with the interior circumferential surface IS of the nozzle channel 200, FIG. 9D so as to align the axis A of the rod or pin portion 26p of the insert 26 with the axis of the channel 200. In one embodiment, the head 26w can be provided with one or more flat surfaces 26f on the circumferential surface 26s that mate with a complementary flat surface 20sf, FIGS. 9BBB, 9BBBB, provided on the inside surface 20s of the channel 200 so that the pin 26p and the flat discontinuity 27 surface 26a is rotationally R fixed and does not rotate or is prevented from rotation around axis A.

[0210] FIG. 10 shows a flow pattern where the pin or rod 1 disposed within the channel 200 is completely cylindrical and has a completely and continuously smooth outer cylindrical surface OS along its entire axial length throughout the axial length LL of the flow channel 200. As shown by the gradations in color or darkness of the fluid in the channel 200 and space S between the outer surface OS of the pin 1 and inner surface IS of the nozzle 30, the flow of fluid 60 flowing from the upstream end to the downstream end undergoes a minimal amount of disturbance, disruption or turbulence over the path of flow.

[0211] By contrast to the uniform flow pattern and velocities of the fluid flowing through the FIG. 10 system, FIGS. 11-13 illustrate the effect of the use of discontinuities 23, 20a to effect a disruption or variation in the flow patterns and flow velocities of injection fluid 60 that flows through the downstream length DP of the straight section SS of a flow channel 20 in an injection molding system 100 having a pin with a discontinuity such as shown in FIGS. 10, 1D, 2C, 2D, 3C, 3D, 4C, 4D, 5C, 5D, 6C, 6D, 7C, 7D, 8C, 8D, 9C, 9D. FIGS. 11-13 show examples where the discontinuity is a flat such as in FIG. 1A, 4A, 5A, 7A or a restricted throat such as in FIG. 6A. As shown by comparison of the flow pattern and velocities shown in FIG. 10, the discontinuities in the pins or rods shown in FIGS. 11-13 are configured and arranged along the axial length L of a pin or rod such that the flow of injection fluid through the straight section SS is modified to flow at substantially different rates or velocities or in substantially different flow patterns taken along a radial cross section RCS along essentially the entire length DP of the straight section SS.

[0212] In the FIG. 11 illustration, the pin 22 has a discontinuity or recess 23 as described above which as shown by the gradations in color or darkness of the fluid 60 in the channel 200 and space S results in a certain disruption or turbulence D in the flow of the fluid over the recess 23.

[0213] In the FIG. 12 illustration, the discontinuity or recess 23 in the pin 22 is oriented at 180 degrees relative to the orientation of the discontinuity in FIG. 11, thus resulting in a different pattern of disruption or turbulence D in the flow of fluid 60 over the recesses 23 through the space S and channel 200.

[0214] In the FIG. 13 illustration, the discontinuities 20a, 20b effect another different pattern of discontinuity or turbulence D in the flow of fluid 60 past and over the gradations 20a, 20b of the pin 20 as described above.

[0215] The pins or rods of the FIGS. 11-13 embodiments are non-rotatable or interconnected to the piston of the actuator 55 such that the pins or rods are prevented from rotating R around their longitudinal axes A within the flow channel 200. Even without rotation R of the pins or rods, the turbulence and variation in flow pattern and velocities as described above are achieved along the length DP of the straight section of the flow channel 200. The same turbulence and variation is achieved with each of the other pin or rod configurations having bores, recesses or discontinuities as described above where such pins or rods are interconnected so as to be prevented from rotating.

[0216] FIG. 14 shows an injection molding system 100 comprised of an injection molding machine 20 that injects fluid material under pressure at high temperature through an inlet 307 into a first downstream manifold channel 40u and further downstream through distribution flow channel 40c of a hotrunner or manifold 50 that routes the injection fluid to the bore or flow channel of a nozzle 60 having a terminal downstream aperture or gate 70 that communicates with the cavity 80 of a mold 82 such that when the gate 70 is open injection fluid flows downstream into the cavity 80.

[0217] In an alternative embodiment the valve pin or rod 10, 12, 14, 16, 18, 20, 22, 24, 26 can be interconnected to both a linear actuator 55 and a rotatable drive actuator 50. The linear actuator 55 has a linear driver or piston 92 that is controllably drivable in an upstream-downstream reciprocal manner along an axis A that is in-line with the flow channel or bore of the nozzle 60 is mounted in a stationary position relative to either a top clamp plate 12 or the manifold 40. In the embodiment shown in FIGS. 14, 15, the linear actuator 55 typically comprises a fluid driven device typically either hydraulic (such as oil) or pneumatic (such as air) driven where a piston 92 is housed within the sealed bore of a cylinder and driven by controllable pumping of the fluid into and out of upstream and downstream drive chambers within the cylinder that houses the piston. The piston is prevented from rotating in the cylinder by guide rod 96 and bore 98. The housing or support 104 of a second rotary actuator 50 is mounted to the linear driver or piston 92 via a connector 106 such that the rotary actuator 50 is movable in the axial direction A in unison with movement of the piston 92. The housing is mounted on sleeves 110 and slides along guide rods 112. The rotary actuator 50 includes a central controllably rotatable rotor 102 that is controllably rotatable R around the axis A of the path of linear travel of the piston 92.

[0218] In such an alternative embodiment, the valve pin 120 is connected to the rotor 102 via a head 122 such that the valve pin 120 moves or translates in unison axially A with axial movement of the piston 92 and rotary actuator 100. The distal tip end 124 of the valve pin 120 is moved axially into and out of a closed gate position during the course of an injection cycle axial movement A of piston 92, actuator 50 and its interconnected valve pin 120 which can have a configuration such as described above for pins 10, 12, 14, 16, 18, 20, 22, 24. The head 122 of the valve pin 120 is connected to the rotor 102 in a manner such that the pin 120 is secure against rotation relative to the rotor 102 itself and at the same time fixedly connected to the rotor 102 whereby the pin 120 rotates R in unison with rotation R of the rotor 102.

[0219] In such an embodiment, FIGS. 14, 15, the pin 120 is adapted not to rotate relative to rotor 102 of FIGS. 14, 15 and will only rotate together with rotation of the rotor 102 itself. As shown, the head 122 of the pin 120 can be provided with a pair of cylindrical grooves that slide into a complementary receiving aperture that is formed within the body of the downstream end 93 of piston 92 or in the body of a connector portion 108 of rotor 102 of the FIGS. 14, 15 embodiment. The receiving aperture has complementary cylindrically shaped protrusions that when mated within the cylindrically shaped grooves of pin 120 prevent pin 120 from rotating relative to rotor 102 or piston 92. The receiving aperture is typically formed by two bores connected by a slot with flat sides with protrusions formed on them. This allows an actuator to be easily disconnected from a valve pin by sliding the actuator sideways after removal of only four (4) connecting bolts.