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WO2003031142A9 - Distributeur de co-injection - Google Patents

Distributeur de co-injection

Info

Publication number
WO2003031142A9
WO2003031142A9 PCT/US2002/031822 US0231822W WO03031142A9 WO 2003031142 A9 WO2003031142 A9 WO 2003031142A9 US 0231822 W US0231822 W US 0231822W WO 03031142 A9 WO03031142 A9 WO 03031142A9
Authority
WO
WIPO (PCT)
Prior art keywords
injection
cold runner
manifold
runner
melt
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2002/031822
Other languages
English (en)
Other versions
WO2003031142A1 (fr
Inventor
Michael B Smith
Thomas Skorch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Conix Corp
Original Assignee
Conix Corp
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 Conix Corp filed Critical Conix Corp
Publication of WO2003031142A1 publication Critical patent/WO2003031142A1/fr
Anticipated expiration legal-status Critical
Publication of WO2003031142A9 publication Critical patent/WO2003031142A9/fr
Ceased legal-status Critical Current

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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • 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
    • B29C45/2756—Cold runner channels
    • 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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials

Definitions

  • This invention relates to a dual drop co-injection manifold.
  • WO 01/62488 discloses a method of making a co-injected molded vehicle component such as a fascia. The method provides for the injection of two plastic materials during the same molding process. A first material is injected into the mold through a first gate and then a second material is injected at a second gate.
  • the two plastic materials are mixed in a hot runner manifold as described in United States Patent No. 6,062,840.
  • This arrangement leads to a problem of consistency and contamination of each of the plastic materials on subsequent shots.
  • the nozzle of the hot runner must be cleaned out with the skin material after the core material is injected to ensure a clean nozzle for the next shot. This cleaning requires more material to eliminate contaminated materials, restricting the amount of re-ground material or lower cost core that can be re-used in subsequent shots which results in a lower cost savings.
  • a manifold for an injection molding system includes a cold runner for delivering material into a cavity in a mold.
  • a first valve gate is coupled to the cold runner for delivering a first injection of material into the cold runner and creating a first flow of the first injection of material through the cold runner.
  • a second valve gate is coupled to the cold runner for delivering a second injection of material into the center of the cold runner to combine with the first flow of the first injection of material to form a combined melt having an outer core melt of the first injection of material and an inner core melt of the second injection of material prior to injection into the cavity of the mold.
  • Figure 1 is a schematic plan view of the manifold arrangement of the present invention
  • Figure 2 is a schematic elevational view of a dual manifold arrangement similar to the manifold arrangement of Figure 1;
  • Figures 3-5 are schematic views of the sequence of co-injection of the present invention.
  • the manifold 12 includes at least two cold runners 16, each having two inlets 18, 20 and an outlet 22.
  • the mold 14 includes at least two mold portions that cooperate together to define a mold cavity 24, as known by those of ordinary skill in the art.
  • the mold cavity 24 has a predetermined shape to define the part to be molded.
  • the cavity 24 has at least two inlets 26 that communicate with the cold runners 16 of the manifold 12.
  • Figure 1 illustrates two cold runners 16. It is apparent to those skilled in the art that more than two cold runners 16 may be incorporated, depending upon the design of the part to be molded. Further, sequential valve gating techniques as taught by United States patent No. 5,762,855 may also be employed and are incorporated herein by reference.
  • the manifold 12 has a body 50 having at least two hot runners 52, 54. Each hot runner 52, 54 has an inlet 56, 58 for receiving an injection end of an injection unit (not illustrated). Each hot runner 52, 54 has an outlet 60, 62. Each outlet 60, 62 has an independent heated manifold drop 28, 30 that communicates with the inlets 18, 20, respectively, of the cold runners 16.
  • the drop 30 is provided with an extended valve gate pin 32 that extends into the cold runner 16 when in a closed condition and is movable to an open position to allow flow of molten material through the drop 30.
  • Drop 28 has a drop pin 34 of conventional length. Each drop pin 32, 34 is operatively controlled by a driver, as is conventional in the art.
  • valve gate pin 34 of the first drop 28 will be opened delivering a first plasticized melt 36 into the cold runner 16.
  • the front 38 of the plasticized melt 36 will flow by and around the extended valve gate pin 32 of the second drop 30.
  • the valve gate pin 32 of the drop 30 is retracted to the open position to allow flow of a second plasticized melt 40 from the drop 30 to a central region of the cold runner 16, wherein the second plasticized melt 40 displaces the first plasticized melt in an inner or core region of the flow of first plasticized melt 36.
  • the two plasticized melts 36, 40 are co-injected into the mold cavity 24.
  • the combined melts 36, 40 will comprise an inner core melt 40 and an outer melt 36.
  • the drop pins 28, 32 are moved back to the closed condition terminating the flow of plasticized melt.
  • the mold 14 can be opened and the molded part removed, together with the solidified melt in the cold runners 16.
  • the excess material is removed from the molded part and can be re-ground and re-introduced into one of the extruders.
  • the inner core melt 40 will comprise material from both a virgin source and a re-ground source and the outer melt 36 will comprise material from only a virgin source.
  • reinforcing materials such as glass fibers, nano-particles and the like can be added to the inner core melt 40 to improve strength and flex modulus.

Landscapes

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

Abstract

L'invention concerne un distributeur (14) destiné à un système de moulage par injection. Le distributeur comprend: un canal froid (16) permettant de distribuer un matériau dans une cavité (24) d'un moule (14); un premier corps de soupape (32) couplé au canal froid (16), de manière à effectuer une première injection de matériau dans le canal froid (16) et à créer un premier flux de la première injection de matériau, via le canal froid (16); un second corps de soupape (34) couplé au canal froid (16) permettant d'effectuer une seconde injection de matériau dans une région centrale du canal froid (16), afin d'obtenir une combinaison avec ledit flux de la première injection de matériau, de manière à former une fusion combinée comprenant un noyau externe de la première injection de matériau et un noyau interne de la seconde injection de matériau, avant l'injection dans ladite cavité (24) dudit moule (14).
PCT/US2002/031822 2001-10-05 2002-10-04 Distributeur de co-injection Ceased WO2003031142A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32741201P 2001-10-05 2001-10-05
US60/327,412 2001-10-05

Publications (2)

Publication Number Publication Date
WO2003031142A1 WO2003031142A1 (fr) 2003-04-17
WO2003031142A9 true WO2003031142A9 (fr) 2004-05-06

Family

ID=23276451

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/031822 Ceased WO2003031142A1 (fr) 2001-10-05 2002-10-04 Distributeur de co-injection

Country Status (1)

Country Link
WO (1) WO2003031142A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2901504B1 (fr) * 2006-05-29 2012-10-26 Plastigray Procede de fabrication d'une piece injectee, dispositif pour la mise en oeuvre de ce procede et piece obtenue
FR3015340B1 (fr) * 2013-12-20 2016-02-05 Faurecia Interieur Ind Outil de realisation d'un element de vehicule comprenant une buse a ouverture progressive
DE102017117444A1 (de) * 2017-08-01 2019-02-07 Werkzeugbau Siegfried Hofmann Gmbh Vorrichtung zur Herstellung eines eine Hautkomponente und eine Kernkomponente umfassenden Kunststoffbauteils
US11179872B2 (en) * 2017-10-24 2021-11-23 Canon Kabushiki Kaisha Resin shaping mold and method of producing resin molded product
KR102486881B1 (ko) 2020-09-01 2023-01-10 엘지전자 주식회사 이중사출 성형 장치, 그의 제어방법 및 이중사출 성형에 의한 사출물

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4805991A (en) * 1986-03-13 1989-02-21 Canon Kabushiki Kaisha Multi-layer resin molded article and method of making the same
DE4041799C2 (de) * 1990-12-24 1993-12-23 Kloeckner Ferromatik Desma Vorrichtung zum Spritzgießen von Sandwichteilen und Vorrichtung zur Durchführung des Verfahrens
JP3279097B2 (ja) * 1994-10-20 2002-04-30 いすゞ自動車株式会社 サンドイッチ成形品の射出装置

Also Published As

Publication number Publication date
WO2003031142A1 (fr) 2003-04-17

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