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WO2000051803A1 - Appareil de moulage par injection a empreintes multiples separant la matiere fondue a proximite de la partie avant de la buse - Google Patents

Appareil de moulage par injection a empreintes multiples separant la matiere fondue a proximite de la partie avant de la buse Download PDF

Info

Publication number
WO2000051803A1
WO2000051803A1 PCT/CA2000/000150 CA0000150W WO0051803A1 WO 2000051803 A1 WO2000051803 A1 WO 2000051803A1 CA 0000150 W CA0000150 W CA 0000150W WO 0051803 A1 WO0051803 A1 WO 0051803A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
valve
injection molding
molding apparatus
extending
Prior art date
Application number
PCT/CA2000/000150
Other languages
English (en)
Inventor
Denis Babin
Original Assignee
Mold-Masters Limited
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
Priority claimed from CA002264224A external-priority patent/CA2264224A1/fr
Application filed by Mold-Masters Limited filed Critical Mold-Masters Limited
Priority to AU26536/00A priority Critical patent/AU2653600A/en
Priority to DE10084280.1T priority patent/DE10084280B3/de
Publication of WO2000051803A1 publication Critical patent/WO2000051803A1/fr

Links

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
    • B29C45/2737—Heating or cooling means therefor
    • B29C2045/274—Thermocouples or heat sensors
    • 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
    • B29C2045/2779—Nozzles with a plurality of outlets
    • 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
    • B29C45/281—Drive means therefor
    • B29C2045/2813—Common drive means for several needle valves

Definitions

  • This invention relates generally to hot runner injection molding and more particularly to valve gated injection molding apparatus wherein each heated nozzle has a number of valve pins extending therethrough and a central melt bore in which the melt splits near the front end of the nozzle to flow through removable nozzle inserts aligned with the gates.
  • each heated nozzle has a number of valve pins extending therethrough and a central melt bore in which the melt splits near the front end of the nozzle to flow through removable nozzle inserts aligned with the gates.
  • DE 37 33 363 shows a hot runner which splits closer to the front end of the nozzle, but it has the disadvantage that there are no individual nozzle inserts that can be made of a more suitable material and are removable for cleaning or replacement if the need arises.
  • valve gated injection molding apparatus wherein the melt bore splits in a valve bushing near the front end of the heated nozzle to flow through removable nozzle inserts aligned with the gates.
  • the invention provides a multi-cavity valve gated injection molding apparatus having one or more heated nozzles extending forwardly into a well in a cooled mold with an insulative air space extending between each heated nozzle and the surrounding cooled mold.
  • Each heated nozzle has a rear end, a front end and a plurality of equally spaced valve pin bores extending therethrough from the rear end to the front end.
  • a corresponding plurality of elongated valve pins are each received in one of the valve pin bores through the heated nozzle.
  • a valve pin actuating mechanism is connected to the valve pins to simultaneously reciprocate the valve pins between an open position and a closed position.
  • Each heated nozzle has a melt bore extending therethrough from a central inlet at the rear end.
  • a valve bushing is seated in a recessed seat in the front end of each heated nozzle.
  • the valve bushing has a rear end, a front end, several equally spaced valve pin bores extending therethrough from the rear end to the front end in alignment with the valve pin bores through the heated nozzle, and a melt bore extending therethrough from the rear end to the front end.
  • the melt bore has several front portions and a central rear portion extending from the rear end in alignment with the melt bore through the heated nozzle. Each front portion extends from the central rear portion diagonally outwardly to join one of the valve pin bores adjacent the front end of the valve bushing.
  • a retaining ring is seated in the recessed seat in the front end of the heated nozzle adjacent the front end of the valve bushing.
  • the retaining ring has a rear end, a front end and several openings extending therethrough from the rear end to the front end. Each opening extends in alignment with one of the valve pin bores through the valve bushing.
  • Several elongated hollow nozzle inserts are retainably seated in the openings through the retaining ring, each having a front portion extending forwardly from the retaining ring in alignment with a gate leading to a cavity.
  • Each nozzle insert has a rear end, a front end, and a central opening extending therethrough from the rear end to the front end to receive one of the valve pins therein.
  • a space extends around the valve pin to convey melt from one of the diagonal front portions of the melt bore through the valve bushing to the aligned gate.
  • a nozzle seal removably mounted at the front end of the heated nozzle bridges the insulative air space between the heated nozzle and the cooled mold, locates the front end of the heated nozzle, and retains the bushing seal, the retaining ring, and the nozzle inserts in place.
  • Figure 1 is a sectional view of a portion of a multi-cavity valve gated injection molding system or apparatus having heated nozzles according to a preferred embodiment of the invention
  • Figure 2 is an enlarged sectional view of a portion of Figure 1
  • Figure 3 is a sectional view along line 3-3 in Figure 2
  • Figure 4 is an exploded isometric view showing a valve bushing, retaining ring, heated nozzles and a nozzle seal ready to be mounted in the front end of a heated nozzle.
  • FIGS 1 - 3 show a portion of a multi-cavity valve gated injection molding system or apparatus having a melt distribution manifold 10 interconnecting several heated nozzles 12.
  • a melt distribution manifold 10 interconnecting several heated nozzles 12.
  • Each nozzle 12 is seated in a well 14 in a mold 16. While the mold 16 usually has a greater number of plates depending upon the application, in this case, only a back plate 18, a manifold plate 20, a cavity plate 22 and a core plate 24 are shown for ease of illustration.
  • the melt distribution manifold 10 is heated by an integral electrical heating element 26 and the mold 16 is cooled by pumping cooling water through cooling conduits 28.
  • the melt distribution manifold 10 is mounted between the manifold plate 20 and the back plate 18 by a central locating ring 30 and a number of insulative spacers 32 attached to the melt distribution manifold 10 by screws 34 to provide an insulative air space 36 between the heated manifold 10 and the surrounding cooled mold 16.
  • the rear end 38 of each nozzle 12 is secured by screws 40 against the front face 42 of the melt distribution manifold 10.
  • Each nozzle 12 has an integral electrical heating element 44 with a terminal 46 and a helical portion 48 extending around a melt bore 50 extending through the heated nozzle 12 from a central inlet 52 at its rear end 38.
  • An outer collar 54 at the rear end 38 of each nozzle 12 has a forwardly extending flange portion 56 which sits on a circular seat 58 in the mold 16 to locate the rear end 38 of the heated nozzle 12 and provide an insulative air space 60 between the heated nozzle 12 and the surrounding cooled mold 16.
  • a number of elongated valve pins 62 are received in equally spaced valve pin bores 64 extending in the heated nozzle 12 in alignment with gates 66 leading to cavities 68.
  • the valve pins 62 are simultaneously reciprocated by hydraulic actuating mechanism 70 in the back plate 18.
  • the hydraulic actuating mechanism 70 includes a piston 72 extending through a high pressured seal 74 in a cylinder 76 mounted in the back plate 18.
  • Each elongated valve pin 62 has an enlarged head 78 which is secured to the piston 72 by a removable cap 80. Controlled fluid pressure is applied to the cylinder 76 on opposite sides of the piston 72 through hydraulic lines 82, 84 to simultaneously reciprocate the elongated valve pins 62 between a retracted open position and a forward closed position in which the front end 86 of each elongated valve pin 62 is seated in one of the gates 66.
  • a melt passage 88 extends from a central inlet 90 in a cylindrical inlet portion 92 of the melt distribution manifold 10 and branches outwardly in the melt distribution manifold 10 to convey melt to the melt bore 50 in each heated nozzle 12.
  • Each heated nozzle 12 has a hold 94 near its front end 96 into which a thermocouple element 98 extends to monitor and control the operating temperature.
  • each heated nozzle 12 has a valve bushing 100 made of tool steel seated in a recessed seat 102 in its front end 96.
  • the valve bushing 100 has three equally spaced valve pin bores 104 extending from its rear end 106 to its front end 108. While the valve pin bushing 100 shown has three valve pin bores 104, it can have more or less in other embodiments.
  • a steel dowel 110 extending between the heated nozzle 12 and the valve bushing 100 ensures the valve bushing 100 is oriented in the recessed seat 102 with each valve pin bore 104 through the valve bushing 100 aligned with one of the valve pin bores 64 through the heated nozzle 12.
  • each elongated valve pin 62 has a larger diameter portion 112 with a smaller diameter portion 114 extending therefrom to the front end 86.
  • the larger diameter portion 112 of each elongated valve pin 62 fits in one of the valve pin bores 104 to prevent melt leakage as the elongated valve pin 62 reciprocates.
  • Each valve bushing 100 also has a melt bore 116 extending therethrough from its rear end 106 to its front end 108.
  • the melt bore 116 has a number of front portions 118 and a central rear portion 120 extending from the rear end 106 in alignment with the melt bore 50 through the heated nozzle 12. As can be seen, each front portion 118 extends diagonally outward from the central rear portion 120 to join one of the valve bores 104 adjacent the front end 108 of the valve bushing 100.
  • a retaining ring 122 which fits inside a nozzle seal 124 is also received in the seat 102 in the front end 96 of the heated nozzle 12 with its rear end 126 abutting against the front end 108 of the valve bushing 100.
  • the retaining ring 122 is also made of H13 tool steel and has three equally spaced openings 128 extending therethrough from its rear end 126 to its front end 130. Each opening 128 has an elongated hollow nozzle insert 132 made of a corrosion and wear resistant and heat conductive material such as a tungsten carbide alloy seated therein.
  • Each nozzle insert 132 has an outwardly extending circular shoulder 134 which abuts against a shoulder 136 extending inwardly around the opening 128 to secure the nozzle insert 132 in place with its rear end 138 abutting against the front end 108 of the valve bushing 100 and a front portion 140 extending forwardly from the front end 130 of the retaining ring 122.
  • Another steel dowel 142 extending between the valve bushing 100 and the retaining ring 122 ensures the nozzle inserts 132 are each aligned with one of the valve pin bores 104 through the valve bushing 100 and with one of the gates 66.
  • Each elongated nozzle insert 132 has a central bore 144 extending therethrough from its rear end 138 to its front end 146.
  • the central bore 144 is big enough to receive the smaller diameter portion 114 of the elongated valve pin 62 therethrough with a big enough space 147 extending around the elongated valve pin 62 to convey melt from the diagonal front portion 118 of the melt bore 116 through the valve bushing 100 to the aligned gate 66.
  • the nozzle seal 124 is also made of H13 tool steel and has a central nut portion 148 and a rear portion 150 with a threaded outer surface 152 which screws into a threaded front portion 154 of the recessed seat 102 in the front end 96 of the heated nozzle 12.
  • the nozzle seal 124 has an inwardly extending circular shoulder 156 that abuts against a shoulder 158 extending around the retaining ring 122 to securely retain the valve bushing 100, the retaining ring 122 and the elongated nozzle inserts 132 in place.
  • the nozzle seal 124 also has a sealing and alignment flange portion 160 that extends forwardly to fit into a matching cylindrical portion 162 of the well 14 in the mold 16 extending around the gates 66.
  • the nozzle seal 124 accurately aligns the front end 96 of the heated nozzle 12 and bridges the insulative air space 60 around the heated nozzle 12 to prevent melt leakage.
  • the injection molding system or apparatus is assembled as shown in Figure 1. Electrical power is applied to the heating element 26 in the melt distribution manifold 10 and the heating elements 44 in the nozzles 12 to heat them to a predetermined operating temperature. Water is pumped through the cooling conduits 28 to cool the mold 16. With hydraulic pressure applied through lines 84 to retract the elongated valve pins 62 to the open position, pressurized melt is applied from a molding machine (not shown) through the central inlet 90 to the melt passage 88.
  • hydraulic pressure is released through line 84 and applied through line 82 to simultaneously drive the elongated valve pins 62 forward to the closed position with their front ends 86 seated in the gates 66.
  • the mold 16 is opened along the parting line 164 to eject the molded products. After ejection, the mold 16 is closed and this injection cycle is repeated continuously with a cycle time dependent upon the size of the cavities 66 and the type of material being molded.
  • valve gated injection molding apparatus wherein the melt bore 116 splits in a valve bushing 100 near the front end 96 of each heated nozzle 12 has been given with respect to a preferred embodiment, it will be evident that various other modifications are possible without departing from the scope of the invention as understood by those skilled in the art and as provided in the following claims.

Landscapes

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

Abstract

L'invention concerne un appareil de moulage par injection à obturateur équipé de plusieurs tiges d'obturateur (62) s'étendant dans chaque buse chauffée (12) entraînées par un mécanisme de commande commun (70). Une boîte d'obturateur (100) se situe à l'extrémité avant (96) de chaque buse chauffée (12). Une cavité centrale de matière fondue (50) située dans chaque buse chauffée (12) est divisée dans la boîte d'obturateur (100) à proximité de l'extrémité avant de la buse chauffée (12) d'où s'écoule la matière fondue autour de chaque tige d'obturateur (62) vers les entrées (66).
PCT/CA2000/000150 1999-02-26 2000-02-16 Appareil de moulage par injection a empreintes multiples separant la matiere fondue a proximite de la partie avant de la buse WO2000051803A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU26536/00A AU2653600A (en) 1999-02-26 2000-02-16 Multi-cavity injection molding apparatus splitting melt near nozzle front
DE10084280.1T DE10084280B3 (de) 1999-02-26 2000-02-16 Mehrform-Spritzgussvorrichtung mit Schmelzeaufsplittung kurz vor dem Düsenende

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA2,264,224 1999-02-26
CA002264224A CA2264224A1 (fr) 1999-02-26 1999-02-26 Moule a injection a empreintes multiples separant la fonte a l'avant des busettes
US09/285,179 US6162044A (en) 1999-02-26 1999-03-23 Multi-cavity injection molding apparatus splitting melt near nozzle front

Publications (1)

Publication Number Publication Date
WO2000051803A1 true WO2000051803A1 (fr) 2000-09-08

Family

ID=25680836

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2000/000150 WO2000051803A1 (fr) 1999-02-26 2000-02-16 Appareil de moulage par injection a empreintes multiples separant la matiere fondue a proximite de la partie avant de la buse

Country Status (2)

Country Link
US (1) USRE39935E1 (fr)
WO (1) WO2000051803A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7699600B2 (en) * 2008-01-30 2010-04-20 Husky Injection Molding Systems Ltd. Flexible plate slot for a hot runner injection molding system
US11780132B2 (en) * 2017-07-14 2023-10-10 Otto Männer GmbH Injection molding device

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US5464343A (en) * 1992-11-27 1995-11-07 Polyshot Corporation Multitip hot runner system

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