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DE3809283A1 - The thermodynamic pin gate nozzle - Google Patents

The thermodynamic pin gate nozzle

Info

Publication number
DE3809283A1
DE3809283A1 DE19883809283 DE3809283A DE3809283A1 DE 3809283 A1 DE3809283 A1 DE 3809283A1 DE 19883809283 DE19883809283 DE 19883809283 DE 3809283 A DE3809283 A DE 3809283A DE 3809283 A1 DE3809283 A1 DE 3809283A1
Authority
DE
Germany
Prior art keywords
nozzle
holding pressure
point gate
heating
pin gate
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
DE19883809283
Other languages
German (de)
Inventor
Wolfgang Prof Dipl Zimmermann
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.)
Individual
Original Assignee
Individual
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 DE19863631850 external-priority patent/DE3631850A1/en
Application filed by Individual filed Critical Individual
Priority to DE19883809283 priority Critical patent/DE3809283A1/en
Publication of DE3809283A1 publication Critical patent/DE3809283A1/en
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
    • B29C45/17—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
    • 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
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C2045/2724—Preventing stringing of the moulding material
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B29C33/06—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using radiation, e.g. electro-magnetic waves, induction heating

Landscapes

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

Abstract

The thermodynamic pin gate nozzle combines the advantages of the pin gate systems on the market: the heating of the runner during the injection phase and holding pressure phase and the possibility of runner blocking at the end of the holding pressure phase and during the cooling time by switching off the nozzle heating. In addition, two further advantages arise: due to the relatively large runner cross-section or due to the melt deformation taking place only once at the nozzle tip, there are only low shearing stresses or orientations of the macromolecules. Secondly, with the existing holding pressure, the gate is blocked in a gentle way, without impact, by switching off the nozzle heating, and consequently the plastic core of the moulding, already transforming into the elastic state, is not deformed.

Description

Der Punktanguß für Spritzgußwerkzeuge zur Herstellung von Gegen­ ständen aus Kunststoff hat den Vorteil, daß keine weitere Bear­ beitung notwendig wird, kein Abfall entsteht und Energie einge­ spart wird.The point gate for injection molds for the production of counter stands made of plastic has the advantage that no further Bear processing is necessary, there is no waste and energy is used is saved.

Auf dem Markt befinden sich zur Zeit drei Heißkanalsysteme:There are currently three hot runner systems on the market:

  • 1. Die offene Lochdüse.1. The open hole nozzle.
  • 2. Die Düse mit in die Düsenöffnung ragen­ dem Torpedo.2. Extend the nozzle into the nozzle opening the torpedo.
  • 3. Die Nadelverschlußdüse.3. The needle valve nozzle.

Alle drei Systeme werden permanent und geregelt elektrisch beheizt.All three systems will permanently and controlled electrically heated.

Bei der durch die Patentansprüche gekennzeichneten elektrisch be­ heizbaren Punktangußdüse wird die Innendüse (a) zyklisch nur während der Einspritzphase und der darauf folgenden Nachdruckphase beheizt. Im Falle einer Widerstandsheizung der Innendüse wird durch die Stärke des Metallstegs (c), der die Düsenspitze mit dem gekühlten Werkzeug verbindet, bzw. durch eine Keramikschicht (b), die den übrigen Düsenkörper vom Werkzeug isoliert, der Wärmeabfluß während der Abkühlperiode eingestellt.In the electrically heatable point gate nozzle characterized by the claims, the inner nozzle (a) is cyclically heated only during the injection phase and the subsequent holding pressure phase. In the case of resistance heating of the inner nozzle, the thickness of the metal web (c) , which connects the nozzle tip to the cooled tool, or a ceramic layer (b) , which insulates the rest of the nozzle body from the tool, adjusts the heat flow during the cooling period.

Bei der beschriebenen Punktangußdüse können drei Größen variiert werden:In the point gate nozzle described, three sizes can be varied will:

  • 1. Heizleistung (Temperatur)1.Heating output (temperature)
  • 2. Heizdauer und2. Heating time and
  • 3. Wärme­ abfluß.3. Warmth outflow.

Bei der Verwendung der Düse in Mehrfachwerkzeugen mit Heißläufer­ verteilung ist die Vorkammer (d) kurz.When using the nozzle in multiple tools with hot runner distribution, the prechamber (d) is short.

Die beanspruchte Punktangußdüse, die eine einfache Lochdüse mit einer während der Einspritz- und Nachdruckphase beheizten Kanal­ wand darstellt, hat folgende Vorteile:The claimed sprue nozzle, which a simple perforated nozzle with a channel heated during the injection and holding pressure phase wall has the following advantages:

  • 1. Glatter Bruch des Angusses, kein Zapfen- oder Fadenziehen.1. Smooth break of the sprue, no pin or thread pulling.
  • 2. Größtmögliche freie Strömungsöffnung.2. Largest possible free flow opening.
  • 3. Der Düsenkanal kann leicht verschleißfest und/oder antiad­ häsiv beschichtet werden.3. The nozzle channel can be easily wear-resistant and / or antiad be coated with an adhesive.
  • 4. Keinerlei Einbauten im Düsenkanal.4. No installations in the nozzle channel.
  • 5. Die Düse hat keine beweglichen Teile.5. The nozzle has no moving parts.
  • 6. Durch die gesteuerte Blockierung des Angußkanals kann eine Entspannung der plastischen Seele des Spritzlings bei Wegnahme des Nachdrucks verhindert werden.6. Due to the controlled blocking of the sprue, a Relaxation of the plastic soul of the molding when removed of the reprint can be prevented.
  • 7. Die Düse ist einfach im Aufbau.7. The nozzle is simple in construction.

Claims (2)

1. Elektrisch beheizbare Punktangußdüse für eine Kunststoff- Spritzgießmaschine mit einem zentralen Fließkanal für den Kunst­ stoff, dadurch gekennzeichnet, daß an der dem Formnest zugewandten Seite die Punktangußdüse eine Innendüse mit geringer Masse auf­ weist, und daß die Innenseite durch einen Widerstandsdraht, einge­ bettet in der Keramikschicht (b), oder induktiv zeitweilig elektrisch beheizt wird.1. Electrically heated point gate for a plastic injection molding machine with a central flow channel for the plastic material, characterized in that on the side facing the mold cavity, the point gate has an inner nozzle with low mass, and that the inside by a resistance wire, embedded in the ceramic layer (b) , or temporarily inductively heated electrically. 2. Elektrisch beheizbare Punktangußdüse nach Anspruch 1, dadurch gekennzeichnet, daß der Wärmeabfluß von der heißen Düse zum kalten Werkzeug während der Abkühlphase durch die Abmessungen einer Kom­ bination eines schlechten Isoliermaterials (zum Beispiel eines Metalls), das die Düsenspitze mit dem Werkzeug thermisch ver­ bindet und eines relativ besseren Isoliermaterials (zum Beispiel einer Keramikmasse), das den Rest des Düsenkörpers thermisch trennt, eingestellt werden kann.2. Electrically heated point gate according to claim 1, characterized characterized in that the heat flow from the hot nozzle to the cold Tool during the cooling phase due to the dimensions of a com combination of poor insulation material (for example one Metals), the thermally ver the nozzle tip with the tool binds and a relatively better insulation material (for example a ceramic mass) that thermally cools the rest of the nozzle body separates, can be adjusted.
DE19883809283 1986-09-19 1988-03-19 The thermodynamic pin gate nozzle Ceased DE3809283A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19883809283 DE3809283A1 (en) 1986-09-19 1988-03-19 The thermodynamic pin gate nozzle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863631850 DE3631850A1 (en) 1986-09-19 1986-09-19 THE THERMODYNAMIC POINT GATE NOZZLE
DE19883809283 DE3809283A1 (en) 1986-09-19 1988-03-19 The thermodynamic pin gate nozzle

Publications (1)

Publication Number Publication Date
DE3809283A1 true DE3809283A1 (en) 1989-09-28

Family

ID=25847631

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19883809283 Ceased DE3809283A1 (en) 1986-09-19 1988-03-19 The thermodynamic pin gate nozzle

Country Status (1)

Country Link
DE (1) DE3809283A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4035194A1 (en) * 1990-11-06 1992-05-07 Jetform Heisskanalnormalien Injection moulding inlet nozzle - has two sections with one section heated intermittently to act as valve
DE4319306C2 (en) * 1992-06-15 2002-11-07 Seiki K K Sprue-free injection molding of synthetic resins with a valve gate
DE102012024926A1 (en) * 2012-12-19 2014-06-26 Volkswagen Aktiengesellschaft Casting apparatus, useful for a hot-runner molding method for manufacturing e.g. aluminum component, comprises a mold cavity comprising two inlet openings, and casting unit comprising a cavity and partially heatable casting channels

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4035194A1 (en) * 1990-11-06 1992-05-07 Jetform Heisskanalnormalien Injection moulding inlet nozzle - has two sections with one section heated intermittently to act as valve
DE4319306C2 (en) * 1992-06-15 2002-11-07 Seiki K K Sprue-free injection molding of synthetic resins with a valve gate
DE102012024926A1 (en) * 2012-12-19 2014-06-26 Volkswagen Aktiengesellschaft Casting apparatus, useful for a hot-runner molding method for manufacturing e.g. aluminum component, comprises a mold cavity comprising two inlet openings, and casting unit comprising a cavity and partially heatable casting channels

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