WO2010091070A1 - Appareil et procédé de moulage par injection à joint hermétique - Google Patents

Appareil et procédé de moulage par injection à joint hermétique Download PDF

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Publication number
WO2010091070A1
WO2010091070A1 PCT/US2010/023030 US2010023030W WO2010091070A1 WO 2010091070 A1 WO2010091070 A1 WO 2010091070A1 US 2010023030 W US2010023030 W US 2010023030W WO 2010091070 A1 WO2010091070 A1 WO 2010091070A1
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WO
WIPO (PCT)
Prior art keywords
seal
groove
wall
pin
channel
Prior art date
Application number
PCT/US2010/023030
Other languages
English (en)
Inventor
Vito Galati
Albert R. Bernier
Original Assignee
Synventive Molding Solutions, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Synventive Molding Solutions, Inc. filed Critical Synventive Molding Solutions, Inc.
Publication of WO2010091070A1 publication Critical patent/WO2010091070A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B29C2045/2889—Sealing guide bushings therefor

Definitions

  • the present invention relates to injection molding equipment generally and more particularly to components and assemblies of hotrunner system that serve to route a molten material through a manifold and nozzle into a mold cavity.
  • Hotrunners, manifolds, actuators, nozzles, nozzle tips, gate areas that are used in injection molding systems serve to receive and route molten material, typically polymer or plastic, under condtions of high pressure and temperature from a high pressure injection molding machine to the cavity of a mold.
  • molten material typically polymer or plastic
  • a natural consequence of the use of such high pressures under which the molten material is injected into the manifold or distribution system is that leakage of the molten material can occur at any location within the flow path in which a space exists or where the outer surface of two separate unitary metal components mate or otherwise come into close contact with each other.
  • an injection molding apparatus comprising: a manifold having a fluid flow channel that communicates with a cavity of a mold to deliver a flow of pressurized fluid material to the cavity; a valve pin extending through a bore in the manifold into the channel, the valve pin being interconnected to an actuator that moves the pin reciprocally back and forth through the bore in the manifold along an axis of the pin, the bore communicating with the channel at an exit position of the bore; and a fluid seal mounted at a position upstream of the exit position of the bore around and in contact with an outer surface of the pin, the seal obstructing upstream flow of fluid material through the bore past the upstream position at which the seal is mounted.
  • the seal typically comprises a ring or tube having an inner circumferential surface in contact with the outer surface of the pin.
  • the apparatus typically further comprises: a bushing mounted on an upper surface of the manifold, an upstream portion of the pin extending through a central bore of the bushing; the bushing having a groove surrounding an entrance aperture of the bore in the manifold through which the pin extends; the seal being mounted within the groove of the bushing; and the bushing having an undersurface compressibly engaged against a manifold surface surrounding the entrance aperture such that flow of fluid material is obstructed between the undersurface and the manifold surface with which the undersurface of the bushing is engaged.
  • the seal preferably comprises a ring or tube formed by a wall and a groove or channel surrounded and defined by the wall, the groove or channel in the ring or tube being open and accessible through an opening in the outer wall.
  • the seal is mounted in an arrangement such that the opening in the outer wall of the ring or tube is oriented or faces downstream toward the bore in the manifold through which the pin extends.
  • the seal comprises a ring or tube formed by a wall and a groove or channel surrounded and defined by the outer wall, the groove or channel in the ring or tube being open and accessible through an opening in the outer wall; the seal being mounted in the groove of the bushing in an arrangement such that the opening in the outer wall of the ring or tube is oriented or faces downstream toward the entrance aperture of the bore in the manifold through which the pin extends.
  • the seal is typically C or U or V shaped in cross-section.
  • the pin and the bore in the manifold through which the pin extends are adapted to provide between about .04 to about .2 mm of clearance between an outer surface of the pin and an inner surface of the bore.
  • an outer surface of the wall of the seal surrounds and engages an outer surface of the pin, the opening in the outer wall receiving fluid material that travels upstream through the bore in the manifold through which the pin extends, the fluid flowing through the opening into the groove or channel of the seal, the wall of the seal being radially expandable under pressure of the fluid material that flows through the opening into the groove or channel of the seal, the seal being mounted around the pin such that the seal engages the pin under increased pressure on radial expansion of the wall of the seal.
  • an outer surface of the wall of the seal surrounds and engages an outer surface of the pin, the opening in the outer wall receiving pressurized fluid material that travels upstream through the bore in the manifold through which the pin extends.the pressurized fluid flowing upstream through the opening into the groove or channel of the seal, the wall of the seal being radially expandable under pressure of the pressurized fluid material that flows through the opening into the groove or channel of the seal, the wall of the seal radially expanding within the groove on receipt of the pressurized fluid material within the groove or channel of the seal, the seal and the groove being configured such that an outer surface of the seal engages an interior wall of the groove and the pin under pressure on radial expansion of the wall of the seal.
  • the seal is mounted in a fluid sealed space defined by upstream and outer walls that surround the pin, the seal being adapted to be received within the fluid sealed space such that a portion of the outer wall of the seal engages the upper and outer walls of the fluid sealed space under pressure at least upon receipt of pressurized fluid material within the groove or channel of the seal, pressurized fluid material being received through the opening in the wall of the seal by upstream flow through the bore in the manifold.
  • the seal is mounted within the fluid sealed space such that the opening within the wall of the seal is unobstructed within the fluid sealed space.
  • the seal and the fluid sealed space are preferably adapted to enable the outer walls of the seal on mounting within the fluid sealed space to form a fluid seal against the outer surface of the pin and the inner walls of the fluid sealed space, the opening in the ring or tube being spaced apart from a downstream wall of the fluid sealed space creating a space within the fluid sealed space that communicates with the bore through which the pin extends, the groove or channel within the seal communicating with the bore via the opening in the wall of the seal.
  • pressurized fluid material that flows upstream through the bore flows into the fluid sealed space, flows through the opening in the wall of the seal and into the channel or groove in the seal causing the wall of the seal to expand and exert a pressurized contact against the outside surface of the pin and the inner surface of the walls of the fluid sealed space in which the seal is mounted.
  • the opening in the ring or tube is preferably spaced apart from a downstream wall of the fluid sealed space within the groove creating a space within the fluid sealed space that communicates with the opening and with the bore through which the pin extends, the groove or channel within the seal communicating with the bore in the manifold via the opening in the wall of the seal and the space created within the fluid sealed space.
  • the seal is typically mounted within a groove having fluid sealable walls surrounding the pin, the seal being adapted to frictionally engage a wall surface of the groove to seal the groove against leakage of pressurized fluid material upstream of the groove.
  • the groove is preferably disposed upstream of the exit position of the bore into the fluid flow channel.
  • the seal typically comprises a ring or tube formed by an outer wall and a groove or channel surrounded and defined by the outer wall, the groove or channel in the ring or tube being open and accessible through an opening in the outer wall, an outer surface of the wall of the seal surrounds and engages an outer surface of the pin, the opening in the outer wall receiving pressurized fluid material that travels upstream through the bore in the manifold through which the pin extends, the pressurized fluid flowing upstream through the opening into the groove or channel of the seal, the wall of the seal being radially expandable under pressure of the pressurized fluid material that flows through the opening into the groove or channel of the seal, the wall of the seal radially expanding within the groove on receipt of the pressurized fluid material within the groove or channel of the seal, the seal and the groove being configured such that an outer surface of the seal engages an interior wall of the groove and the pin under pressure on radial expansion of the wall of the seal.
  • the apparatus can further comprise a top clamp plate and the mold, the manifold being disposed between the top clamp plate and the mold.
  • an injection molding apparatus comprising: a top clamp plate and a mold, a manifold disposed between the top clamp plate and the mold, the manifold having a fluid flow channel that communicates with a cavity of the mold to deliver a flow of pressurized fluid material to the cavity; a valve pin extending through a bore in the manifold into the channel, the valve pin being interconnected to an actuator that moves the pin reciprocally back and forth through the bore in the manifold along an axis of the pin, the bore communicating with the channel at an exit position of the bore into the fluid flow channel; a fluid seal mounted at a position upstream of the exit position of the bore into the fluid flow channel around and in contact with an outer surface of the pin, the seal obstructing upstream flow of fluid material through the bore past the upstream position at which the seal is mounted.
  • the seal is preferably mounted within a groove having fluid sealable walls surrounding the pin, the groove being disposed upstream of the exit position of the bore into the fluid flow channel, and the seal being adapted to frictionally engage a wall surface of the groove to seal the groove against leakage of pressurized fluid material upstream of the groove.
  • the seal preferably comprises a ring or tube formed by an outer wall and a groove or channel surrounded and defined by the outer wall, the groove or channel in the ring or tube being open and accessible through an opening in the outer wall, an outer surface of the wall of the seal surrounds and engages an outer surface of the pin, the opening in the outer wall receiving pressurized fluid material that travels upstream through the bore in the manifold through which the pin extends, the pressurized fluid flowing upstream through the opening into the groove or channel of the seal, the wall of the seal being radially expandable under pressure of the pressurized fluid material that flows through the opening into the groove or channel of the seal, the wall of the seal radially expanding within the groove on receipt of the pressurized fluid material within the groove or channel of the seal, the seal and the groove being configured such that an outer surface of the seal engages an interior wall of the groove and the pin under pressure on radial expansion of the wall of the seal.
  • an injection molding apparatus comprising: a top clamp plate and a mold, a manifold disposed between the top clamp plate and the mold, the manifold having a fluid flow channel that communicates with a cavity of the mold to deliver a flow of pressurized fluid material to the cavity, a valve pin extending through a bore in the manifold into the channel, an actuator interconnected to the valve pin, the actuator moving the pin reciprocally back and forth through the bore in the manifold along an axis of the pin, the bore communicating with the channel at an exit position of the bore into the fluid flow channel; a fluid seal mounted in a groove having fluid sealable walls surrounding the pin, the groove being disposed upstream of the exit position of the bore into the fluid flow channel, the seal being adapted to frictionally engage a wall surface of the groove to seal the groove against leakage of pressurized fluid material upstream of the groove.
  • the seal comprises a ring or tube formed by an outer wall and a groove or channel surrounded and defined by the wall, the groove or channel in the ring or tube being open and accessible through an opening in the outer wall, the opening in the outer wall receiving fluid material that travels upstream through the bore in the manifold through which the pin extends, the fluid flowing through the opening into the groove or channel of the seal, the wall of the seal being radially expandable under pressure of the fluid material that flows through the opening into the groove or channel of the seal, the seal being mounted in the groove such that the seal frictionally engages the groove under increased pressure on radial expansion of the wall of the seal.
  • an injection molding apparatus that comprises a manifold having a bore in which a valve pin is mounted for reciprocal movement therethrough wherein the valve pin bore communicates with a fluid flow channel that delivers pressurized fluid material to a cavity of the manifold, the valve pin extending from the valve pin bore into the fluid flow channel at an exit position into the fluid flow channel, the pressurized fluid material being forced under pressure in an upstream direction, a method of obstructing flow of the fluid material upstream from the fluid flow channel, the method comprising: forming a fluid sealable groove around the valve pin at a position upstream of the exit position of the bore, forming a fluid seal having a configuration that is adapted to mount within the groove formed around the valve pin; forming the fluid seal from a heat resistant material, forming the fluid seal in a configuration having an outer wall that frictionally engages at least one of a wall of the groove or an outside surface of the pin.
  • Such a method typically further comprises; forming the seal in a configuration where the seal has a groove or channel enclosed by the outer wall and the outer wall has an opening, and, mounting the seal in the groove surrounding the valve pin in an orientation that enables pressurized fluid material to flow into the groove or channel of the seal.
  • FIG. 1 is a cross-sectional view of one embodiment of an apparatus according to the invention showing a bushing mounted within a receiving aperture within a hotrunner or manifold of an injection molding system, a fluid seal being mounted within a groove at the downstream tip/end of the bushing surrounding a valve pin that is mounted through a central bore in the bushing for reciprocal back and forth axial movement through the bore, the seal engaging the outer circumferential surface of the pin;
  • FIG. 2 is a fragmentary enlarged sectional view of the mounting area at which the fluid seal of the Fig. 1 system surrounds and engages the outer circumferential surface of the valve pin;
  • FIG. 3A is a top plan view of one embodiment of a fluid seal according to the invention, the seal comprising a hollow circular tube or donut shaped mechanism;
  • Fig. 3B is a perspective sectional view of the Fig. 3A seal along lines SB- SB of Fig. 3A;
  • Fig. 3C is a top view of another seal configuration according to the invention, the seal comprising a hollow circular tube or donut having an opening in the outer wall of the seal;
  • Fig. 3D is a perspective sectional view of the Fig. 3C seal along lines 3D- 3D of Fig. 3C, showing the opening in the wall of the seal forming a C or a rounded U configuration in a cross-section of the wall;
  • Fig. 3E is a perspective sectional view of a portion of a flexible tube that can be used to form the seal embodiment of Figs. 3A, 3B;
  • Fig. 3F is a perspective sectional view of a strip of flexible material having a V-shaped configuration in cross-section that can be used to form a circular seal mechanism in the same manner as described herein with reference to the Figs. 3A-3D seal embodiments;
  • FIG. 4 is a partial cross-sectional side view of a larger hotrunner system in which the components shown in Figs. 1 and 2 are incorporated showing the valve pin interconnected to an actuator having quickly couplable and decouplable valve pin mounted in an actuator that is mounted within and fluid channel communicating with fluid channels in a top clamp plate that is mounted over a hotrunner or fluid distribution manifold;
  • FIG. 5 is a partial cross-sectional side view another embodiment of a hotrunner system having a more axially extended bushing with a seal mounted in a groove positioned at the tip end of the bushing surrounding the valve pin and having another embodiment of an actuator that is mounted on the top of a hotrunner for ready removal and re-installation of the actuator on the hotrunner;
  • Fig. 6 is an enlarged fragmentary view of the bushing and seal components of the Fig. 5 system
  • Fig. 7 is an exploded cross-sectional exploded view of the actuator, clamp plate, hotrunner, bushing, mounting nut, fluid seal and valve pin components of the Figs. 1 , 2, 4 systems;
  • Fig. 8 is an exploded perspective view of the Figs. 1 , 2, 4, 7 system.
  • FIG. 1 shows a valve pin 20 mounted in bushing 30 that is mounted in a receiving aperture 42 of a hotrunner or fluid distribution manifold 40.
  • the bushing 30 is compressibly maintained within the aperture 42 by a nut that had threads 52 that are screwably engaged with complementary threads 44 provided on the side walls of the manifold mounting aperture 42.
  • the bushing 30 has flanged portion 32 at its downstream distal end against which a bottom surface of the nut compresses when screwed in a downstream direction X to firmly hold the bushing 30 in the position shown within the manifold aperture 42.
  • valve pin 20 is mounted within a central bore 34 of the bushing so that the valve pin 20 can be moved reciprocally back and forth A along the axis of the valve pin through the central bore 34 by an actuator.
  • a fluid seal 60 member that is formed, without limitation, into an embodiment or form as shown for example in any of Figs. 3A-D and (or 3F when formed into a circle) is mounted within a complementary mounting groove 36 that is formed in the downstream inner circumferential end of the bushing 30.
  • the groove 36 can alternatively be provided in the manifold itself, e.g. in the position shown as 36m in Fig. 2 which is upstream from the exit position 72 of the bore 49 into flow channel 70.
  • the mounting groove for the seal member can be provided in any mounting component through which the valve pin 20 extends at a position upstream of the manifold flow channel 70, Fig. 4.
  • the seal 60 has a wall 6Ow having outer surfaces such as 6Oa 1 60b that engage or contact outer surfaces 22a of the pin 20 and further engage/contact one or more inner wall surfaces such as 36a, 36b of the mounting groove 36.
  • the size and configuration of the groove 36 (or 36m) is configured such that the inner wall surfaces 36a, 36b of the groove define a space that is fluid sealed or sealable when the seal member 60 is properly mounted within the groove 36.
  • the groove 36 (or 36m) is configured so as to be complementary in size and shape to the outer wall 6Ow of the seal member 60 such that the outer wall surfaces of the wall 6Ow of the seal snugly fit within the groove 36.
  • the seal member 60 itself can be a complete tube as shown in Figs. 3A, 3B, 3E or can preferably be provided with an opening 6Ox in the wall 6Ow for enabling receipt of pressurized fluid material that backflows in the upstream direction UT through manifold bore 49 through which pin 20 extends.
  • Pressurized fluid material is injected into the system and flows through manifold channel 70.
  • pressurized fluid material travels past the position 72, Fig. 4, at which the valve pin 20 enters the channel 70, the fluid material naturally flows in small part in the upstream direction UT through the bore 49 in the manifold 40 through which the pin extends.
  • the manifold bore 49 is configured to a size and shape such that a clearance of between about .04 and about .2 mm is left between the outside surface 22a of the pin 20 and the inside surface of the bore 49 thus leaving a small gap 48 in the manifold bore 49.
  • the diameter of the manifold bore DMB, Fig. 2 is between about .04 and about .2 mm larger than the diameter DP of the pin 20.
  • the gap 48 in the manifold bore 49 therefore communicates with the space within the groove 36 and also with the fluid flow channel 70 at the point 72 at which the pin 20 extends and the bore 49 exits into the channel 70. Therefore the space defined by the groove 36 is in fluid communication with the manifold fluid flow channel 70 by virtue of the gap 48 in the manifold bore 49.
  • the portions 60a, 60b of the walls 6Ow of the seal member 60 are preferably configured and adapted to be of a size, thickness, material and flexibility that enables those portions 60a, 60b of the seal wall 6Ow that are immediately adjacent the outside surface 22a of the pin and the inside surface 36b of the groove to flex outwardly under the pressure of the fluid material that flows upstream UT into the interior groove or channel 60c of the seal member 60.
  • the bushing 30 is mounted in the manifold 30, the bore 34 of the bushing forming an upstream continuum of the manifold bore 49 through both of which the pin 20 extends.
  • the seal 60 is configured and adapted so that the seal is mountable and mounted within the groove 36 in an orientation where the opening 6Ox in the wall 6Ow is oriented toward/facing downstream and in general alignment and communication with the point at which gap 48 communicates with the fluid sealed space within groove 36 so that the fluid flow upstream UT is immediately and readily receivable through the opening 6Ox into the channel or groove 60c within the seal member 60.
  • the cross-sectional configuration of the seal member 60 is generally U-shaped.
  • the seal member 60 is U or C or V shaped in cross-section as shown in Figs. 3C, 3D, 3F.
  • the seal member 60 is provided with walls 6Ow that are flexible under pressure.
  • such flexibility enables wall portions 60a, 60b to flex radially outwardly to form a fluid seal with an immediately adjacent surface such as 22a or 36b or 36a.
  • the seal member 60 can have a cross-sectional configuration as shown in Figs. 3A, 3B.
  • the wall 6Ow is flexible enough to be compressed and compressible within groove 36 and to engage the interior wall surfaces 36a, 36b and the pin surface 22a under pressure to create a seal against upstream leakage of fluid past groove 36 that may enter the space within groove 36 through gap 48.
  • the seal member is preferably selected and adapted to be of size and configuration such that the seal member 60 is snugly fittable within the space within the groove 36 provided within the bushing 30 or the manifold 40 before the so that when the bushing 30 is compressed downwardly/downstream by the nut 50 the seal member 60 is further compressed within the groove 36 and the outer surfaces of the walls particularly surfaces 60a and 60b are forced into crushed frictional contact with the outer surface 22a of the pin and the inner wall surfaces 36a, 36b of the groove 36 forming a seal against leakage of fluid past those seal points.
  • the groove 36 and the seal 60 are preferably configured and adapted to enable the seal 60 to be mounted within the groove 36 (typically via a snug fit) leaving a small fluid receiving space 36s downstream of the opening 6Ox that communicates with the opening 6Ox and the inner groove or channel 60c of the member 60 so that pressurized fluid that flows upstream UT into the space 36s is better assured and enabled of flowing through 6Ox and into the channel 60c so that the walls 60a, 60b are flexed outwardly on receipt of pressurized fluid.
  • the seal 60 and the space within the groove 60 are preferably adapted to enable the outer wall surfaces 60a, 60b of the seal on mounting within the space of the groove 60 to form a fluid seal against the outer surface 22a of the pin 20 and the inner surfaces of the groove walls 36a 36b within the space enclosed by the walls 36a, 36b.
  • the opening 6Ox in the ring or tube 60 is preferably spaced apart by a downstream positioned space 36s from a downstream wall or surface 36btm, Fig. 2.
  • the bottom wall 36btm is formed by a top surface of the manifold.
  • the downstream or bottom surface 33 of the bushing 30 is in compressed contact with the top or upstream surface 45 of the manifold 40 creating a seal against leakage of fluid between the two surfaces and thus enclosing the bottom end of the groove 60 from fluid leakage.
  • the bottom surface 36btma would provide the analogous bottom surface to surface 36btm.
  • the downstream space 36s between the opening 6Ox and the bottom surface of the groove 36 creates a space within the groove 36 that communicates with the gap 48 in the manifold bore 49 through which the pin 20 extends, the groove or channel 60c within the seal 60 communicating with the bore gap 48 via the opening 6Ox in the wall of the seal member 60.
  • the top end 23 of the valve pin 20 is connected to an actuator 80 that drives reciprocally back and forth D the pin 20 along its axis A in a concomitant back and forth manner.
  • the actuator is mounted in an aperture or well 102 within clamp plate 100 with hydraulic or pneumatic connections to the actuator contained within the top clamp plate 100 and the top 23 of the pin 20 is connected to the actuator 80 via dowels 27.
  • the actuator 80 is readily removably mounted on top of the manifold 40 and the head 23 of the pin is directly fitted within a slot of the piston 82 of the actuator 80.
  • the pin typically extends downstream through a nozzle 110 that terminates at a gate to a mold, the downstream tip end of the pin 20 being configured and adapted to close the gate (aperture) that leads to the cavity of a mold.
  • the manifold flow channel 70 is mated with the flow channel 112 of a nozzle 110 at mating position 114 so that the flow of fluid material that is fed into channel 70 flows without leakage and uninterrupted under pressure from channel 70 into the nozzle flow channel 112 and eventually through the downstream exit end of the nozzle and the gate of the mold into the cavity of the mold (not shown).
  • the outer wall surface 60a adjacent the pin 20 preferably engages the outer surface 22a of the pin with enough friction/pressure when the sytem is initially assembled prior to start-up of the flow of pressurized fluid material through channel 70 to enable a fluid seal at the position where 60a engages surface 22a.
  • the fluid material additionally serves to exert additional pressure between surface 60a and pin surface 22a thus creating an even greater seal against fluid leakage between these surfaces.
  • This fluid seal together with the seal created by engagement of surfaces 60b and 36a, 36b, thus obstruct or prevent fluid backflow up through gap 39 out of the top end 37 of the bushing 30 or other component through which the pin 20 extends.
  • the seal 60 is typically comprised of a high heat resistant material resistant to temperatures in the range of about 300 to about 700 degrees Fahrenheit.
  • Typical materials of which the seal can be comprised are Vespel and other high temperature resistant polymeric materials, steel and other preferably low thermally conductive metal materials.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

La présente invention concerne un appareil de moulage par injection comprenant : un collecteur (40) comprenant une voie d'écoulement de fluide (70) qui communique avec une cavité d'un moule pour délivrer un flux de matière fluide sous pression dans la cavité; une goupille de vanne (20) s'étendant dans un trou (34) du collecteur et pénétrant dans la voie d'écoulement, la goupille de vanne (20) étant interconnectée à un actionneur qui amène la goupille (20) à se déplacer selon un mouvement de va-et-vient d'avant en arrière dans le trou (34) du collecteur (40) le long d'un axe de la goupille (20), le trou (34) communiquant avec la voie d'écoulement (70) au niveau d'une position de sortie du trou (34); et un joint hermétique aux fluides (60) monté à une position en amont de la position de sortie du trou (34) dans la voie d'écoulement (70), se trouvant autour d'une surface extérieure de la goupille (20) et en contact avec ladite surface, le joint (60) obstruant l'écoulement vers l'amont de la matière fluide, à travers le trou (34) au-delà de la position en amont à laquelle le joint (60) est monté.
PCT/US2010/023030 2009-02-03 2010-02-03 Appareil et procédé de moulage par injection à joint hermétique WO2010091070A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14946009P 2009-02-03 2009-02-03
US61/149,460 2009-02-03

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WO2010091070A1 true WO2010091070A1 (fr) 2010-08-12

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2374596A3 (fr) * 2010-04-06 2012-08-15 Mold Hotrunner Solution, Inc. Buse à obturateur de seuil d'injection doté d'un joint racleur
CN103057047A (zh) * 2011-10-24 2013-04-24 张洪兴 改进连接配合安装方式的热流道系统
JP2015013381A (ja) * 2013-07-03 2015-01-22 カルソニックカンセイ株式会社 樹脂成形用金型装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627680A1 (de) * 1996-07-10 1998-01-15 Lederer Gmbh Nadelverschlußdüsensystem für ein Kunststoff-Spritzgießwerkzeug, insbesondere zur Verarbeitung von Silikonkautschuken
WO1999054109A1 (fr) * 1998-04-21 1999-10-28 Dynisco Hotrunners, Inc. Systeme de collecteur avec regulation de l'ecoulement
WO2009055901A1 (fr) * 2007-10-31 2009-05-07 Husky Injection Molding Systems Ltd. Canal chauffé présentant une coulure de tige de soupape réduite

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627680A1 (de) * 1996-07-10 1998-01-15 Lederer Gmbh Nadelverschlußdüsensystem für ein Kunststoff-Spritzgießwerkzeug, insbesondere zur Verarbeitung von Silikonkautschuken
WO1999054109A1 (fr) * 1998-04-21 1999-10-28 Dynisco Hotrunners, Inc. Systeme de collecteur avec regulation de l'ecoulement
WO2009055901A1 (fr) * 2007-10-31 2009-05-07 Husky Injection Molding Systems Ltd. Canal chauffé présentant une coulure de tige de soupape réduite

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2374596A3 (fr) * 2010-04-06 2012-08-15 Mold Hotrunner Solution, Inc. Buse à obturateur de seuil d'injection doté d'un joint racleur
CN103057047A (zh) * 2011-10-24 2013-04-24 张洪兴 改进连接配合安装方式的热流道系统
JP2015013381A (ja) * 2013-07-03 2015-01-22 カルソニックカンセイ株式会社 樹脂成形用金型装置

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