DE1929343A1 - Nozzle for introduction of blowing agent - into foamable plastics - Google Patents

Nozzle for introduction of blowing agent - into foamable plastics

Info

Publication number
DE1929343A1
DE1929343A1 DE19691929343 DE1929343A DE1929343A1 DE 1929343 A1 DE1929343 A1 DE 1929343A1 DE 19691929343 DE19691929343 DE 19691929343 DE 1929343 A DE1929343 A DE 1929343A DE 1929343 A1 DE1929343 A1 DE 1929343A1
Authority
DE
Germany
Prior art keywords
nozzle
blowing agent
introduction
foamable plastics
propellant
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.)
Pending
Application number
DE19691929343
Other languages
German (de)
Inventor
Froehner Dipl-Ing Hans W
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.)
WERKZEUGBAU FUCHSLOCHER oHG
Original Assignee
WERKZEUGBAU FUCHSLOCHER oHG
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 WERKZEUGBAU FUCHSLOCHER oHG filed Critical WERKZEUGBAU FUCHSLOCHER oHG
Priority to DE19691929343 priority Critical patent/DE1929343A1/en
Publication of DE1929343A1 publication Critical patent/DE1929343A1/en
Pending 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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1734—Nozzles therefor
    • B29C45/1735—Nozzles for introducing the fluid through the mould gate, e.g. incorporated in the injection nozzle
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
    • B29C44/424—Details of machines
    • B29C44/425—Valve or nozzle constructions; Details of injection devices
    • 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
    • B29C45/20—Injection nozzles
    • B29C45/23—Feed stopping equipment
    • B29C45/231—Needle valve systems therefor

Abstract

The blowing agent is introduced into the mould cavity through a bore in the nozzle. The blowing agent and plasticised material are added separately whilst they are simultaneously mixed. Specifically, the blowing agent is a gas.

Description

Spritzdüse zum Einbringen des Treibgases bei der Verarbeitung aller schaumfähigen Kunststoffe Die Erfindung betrifft eine Spritzdüse, die das Einbringen eines Treibgases bei der Verarbeitung schaumfähiger Kunststoffe gleichzeitig mit dem Einspritzen des Kunststoffes ermöglicht.Spray nozzle for introducing the propellant gas when processing all foamable plastics The invention relates to a spray nozzle, which the introduction a propellant gas when processing foamable plastics at the same time allows the injection of the plastic.

Bei den heute bekannten Verfahren ist das Treibmittel dem Kunststoffgranulat beigemischt. Die Spritzgießform wird ungefähr zu zwei Drittel mit dem aufgeschmolzenen Material gefüllt und der durch die Volumenvergrößerung hervorgerufene Druckabfall bewirkt ein Aufschäumen des Materials in der Spritzgießform.In the processes known today, the blowing agent is the plastic granulate mixed in. The injection mold is about two thirds of the melted one Material filled and the pressure drop caused by the increase in volume causes the material to foam in the injection mold.

Der Nachteil bei diesen Verfahren ist, daß ein Druckabfall im Plastizierzylinder und in der Düse zum vorzeitigen Aufschäumen des plastizierten Materials und dadurch zu. Produktionsstörungen führt.The disadvantage with this method is that there is a pressure drop in the plasticizing cylinder and in the nozzle for premature foaming of the plasticized material and thereby to. Production disruptions.

Ein weiterer Nachteil der herkömmlichen Methoden ist darin zu sehen daß die treibmittelhaltigen Granulate nur begrenzt lagerfähig sind. Durch die Erfindung ist es nun gelungen diese Nachteile auszuschalten.Another disadvantage of the conventional methods can be seen in this that the blowing agent-containing granules can only be stored for a limited time. Through the invention has now succeeded in eliminating these disadvantages.

Die Erfindung ist darin zu sehen, daß bei den bekannten Ausführungen von Nadelverschlußdüsen die Düsennadel mit einer Durchgangsbohrung, versehen ist, durch die, beim Einspritzen des aufgeschmolzenen Kunststoftmaterials, eine genau dosierte Menge Treibgas mit in den Formenhohlraum eingeblasen wird.The invention can be seen in the fact that in the known designs of valve gate nozzles the nozzle needle is provided with a through-hole, by, when injecting the melted plastic material, one exactly dosed amount of propellant gas is blown into the mold cavity.

Durch das direkte Einblasen des Treibgases in die aufgeschmolzene Kunststoffmasse erübrigt sich das Beimischen des Treibmittels zum Granulat und ein vorzeitiges Aufschäumen wird verhindert.By blowing the propellant gas directly into the melted Plastic compound, there is no need to add the propellant to the granulate and add it premature foaming is prevented.

Dieses Verfahren lässt sich auch anwenden bei größeren Teilen die an mehreren Stellen angespritzt werden Die Erfindung wird nachfolgend an Hand der Zeichnung näher erklärt.This procedure can also be used for larger parts are injected at several points The invention is based on the Drawing explained in more detail.

Die Spritzdüse ist in den Plastizierzylinder 1) eingeschraubt und besteht im wesentlichen aus Düsenkörper 2), Düsenkopf 3), Düsennadel 4), Brücke 5) und Feder 6). Die Düsennadel 4) ist mit einer durchgehenden Bohrung 7) versehen, durch die das Treibgas während dem Einspritzen der aufgeschmolzenen Kunststoffmasse beigemischt wird.The spray nozzle is screwed into the plasticizing cylinder 1) and consists essentially of nozzle body 2), nozzle head 3), nozzle needle 4), bridge 5) and spring 6). The nozzle needle 4) is provided with a through hole 7), through which the propellant gas during the injection of the melted plastic mass is added.

Die Wirkungsweise ist folgende: Nach dem Plastiziervorgang wird die Schnecke in bekannter Weise mit Druck beaufschlagt und der dadurch im Plastizierzylinder herrschende Druck bewirkt durch Beaufschlagung der Nadelfläche 8) der Düsennadel 4), daß diese entgegen der Wirkung der Druckfeder &) die Austrittsöffnung 9) für den Durchfluß des plastizierten Kunststoffes freigibt. Gleichzeitig mit der Betätigung des Wegeventils zur Druckbeaufschlagung der Schnecke wird ein Absperrventil 10) in der Treibgaszuführung geöffnet, und das Treibgas strömt mit dem plastizierten Material in den Formenhohlraum. Nach Beendigung des Einspritzvorganges bzw. uach einer gewissen einstellbaren Zeit wird das Absperrventil 10) geschlossen und die Treibgaszufuhr unterbrochen.The mode of action is as follows: After the plasticizing process, the The screw is pressurized in a known manner and this is then in the plasticizing cylinder The prevailing pressure is brought about by acting on the needle surface 8) of the nozzle needle 4) that this counteracts the action of the compression spring &) the outlet opening 9) releases for the flow of the plasticized plastic. Simultaneously with the Actuation of the directional valve to pressurize the screw becomes a shut-off valve 10) is opened in the propellant gas supply and the propellant flows with the plasticized one Material into the mold cavity. After completion of the injection process or uach a certain adjustable time, the shut-off valve 10) is closed and the Propellant supply interrupted.

Claims (2)

PatentansprücheClaims 1) Spritzdüse, mechanisch oder hydraulisch betätigt zur Verarbeitung aller schaumfähigen Kunststoffe dadurch gekennzeichnet, daß das Treibmittel durch eine Bohrung in der Düsennadel getrennt vom plastizierten Material unter gleichzeitiger Beimischung in den Formenhohlraum eingebracht wird.1) Spray nozzle, mechanically or hydraulically operated for processing all foamable plastics characterized in that the propellant by a hole in the nozzle needle separated from the plasticized material while at the same time Admixture is introduced into the mold cavity. 2) Spritzdüse nach Anspruch 1) dadurch gekennzeichnet, daß eine oder mehrere Düsen fest mit dem Werkzeug verbunden sind und der plastizierte Kunststoff sowie das Treibmittel an mehreren Stellen gleichzeitig in den Formenhohlraum eingebracht wird. 2) Spray nozzle according to claim 1) characterized in that one or several nozzles are firmly connected to the tool and the plasticized plastic and the propellant is introduced into the mold cavity at several points at the same time will. L e e r s e i t eL e r s e i t e
DE19691929343 1969-06-10 1969-06-10 Nozzle for introduction of blowing agent - into foamable plastics Pending DE1929343A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19691929343 DE1929343A1 (en) 1969-06-10 1969-06-10 Nozzle for introduction of blowing agent - into foamable plastics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691929343 DE1929343A1 (en) 1969-06-10 1969-06-10 Nozzle for introduction of blowing agent - into foamable plastics

Publications (1)

Publication Number Publication Date
DE1929343A1 true DE1929343A1 (en) 1970-12-17

Family

ID=5736551

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19691929343 Pending DE1929343A1 (en) 1969-06-10 1969-06-10 Nozzle for introduction of blowing agent - into foamable plastics

Country Status (1)

Country Link
DE (1) DE1929343A1 (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2440193A1 (en) * 1973-09-19 1975-03-20 Lo Sfruttamento Di Brevetti S Injection moulded foamed plastics materials - produced from same material and having porous core and pore free skin
US4033710A (en) * 1975-07-25 1977-07-05 Robert Hanning Apparatus for making thermoplastic articles with porous cores and less porous or nonporous skins
US4101617A (en) * 1975-01-15 1978-07-18 Rohm Gmbh Method for injection molding of hollow shaped bodies from thermoplastic resins
US4106887A (en) * 1977-02-21 1978-08-15 Asahi-Dow Limited Apparatus for injection molding synthetic resin materials
US4129635A (en) * 1973-12-28 1978-12-12 Asahi-Dow Limited Method for producing foamed moldings from synthetic resin materials
US4140672A (en) * 1977-01-05 1979-02-20 Asahi-Dow Limited Process for producing moldings
US4781554A (en) * 1987-07-09 1988-11-01 Michael Ladney Apparatus for the injection molding of thermoplastics
WO1989005226A1 (en) * 1987-12-09 1989-06-15 Siebolt Hettinga Method and injection nozzle unit for molding a plastic article
US4855094A (en) * 1987-09-21 1989-08-08 Michael Ladney Method for the injection molding of plastic articles using fluid pressure
US4905901A (en) * 1988-08-30 1990-03-06 Sajar Plastics, Inc. Injection molding nozzle
US4923666A (en) * 1987-04-28 1990-05-08 Cinpres Limited Method of injection moulding
US4935191A (en) * 1986-10-16 1990-06-19 Thomas W. Johnson Process of insection molding with pressurized gas assist
DE3841880A1 (en) * 1988-12-13 1990-06-21 Basf Ag Gassing nozzle for directly gassing polymer melts by the internal gas pressure method
EP0405663A1 (en) * 1989-06-26 1991-01-02 Stork Plastics Machinery B.V. Injector head
US5112563A (en) * 1986-05-19 1992-05-12 Nitrojection Corporation Process of injection molding with pressurized gas assist
US5256047A (en) * 1991-12-03 1993-10-26 Nitrojection Corporation Gas assisted injection molding apparatus utilizing sleeve and pin arrangement
US5284429A (en) * 1992-05-07 1994-02-08 Cascade Engineering, Inc. Gas-assisted injection molding apparatus

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2440193A1 (en) * 1973-09-19 1975-03-20 Lo Sfruttamento Di Brevetti S Injection moulded foamed plastics materials - produced from same material and having porous core and pore free skin
US4129635A (en) * 1973-12-28 1978-12-12 Asahi-Dow Limited Method for producing foamed moldings from synthetic resin materials
US4101617A (en) * 1975-01-15 1978-07-18 Rohm Gmbh Method for injection molding of hollow shaped bodies from thermoplastic resins
US4033710A (en) * 1975-07-25 1977-07-05 Robert Hanning Apparatus for making thermoplastic articles with porous cores and less porous or nonporous skins
US4115491A (en) * 1975-07-25 1978-09-19 Robert Hanning Method of making thermoplastic articles with porous cores
US4140672A (en) * 1977-01-05 1979-02-20 Asahi-Dow Limited Process for producing moldings
US4106887A (en) * 1977-02-21 1978-08-15 Asahi-Dow Limited Apparatus for injection molding synthetic resin materials
US5112563A (en) * 1986-05-19 1992-05-12 Nitrojection Corporation Process of injection molding with pressurized gas assist
US4935191A (en) * 1986-10-16 1990-06-19 Thomas W. Johnson Process of insection molding with pressurized gas assist
US4923666A (en) * 1987-04-28 1990-05-08 Cinpres Limited Method of injection moulding
US4781554A (en) * 1987-07-09 1988-11-01 Michael Ladney Apparatus for the injection molding of thermoplastics
US4855094A (en) * 1987-09-21 1989-08-08 Michael Ladney Method for the injection molding of plastic articles using fluid pressure
WO1989005226A1 (en) * 1987-12-09 1989-06-15 Siebolt Hettinga Method and injection nozzle unit for molding a plastic article
US4905901A (en) * 1988-08-30 1990-03-06 Sajar Plastics, Inc. Injection molding nozzle
DE3841880A1 (en) * 1988-12-13 1990-06-21 Basf Ag Gassing nozzle for directly gassing polymer melts by the internal gas pressure method
EP0405663A1 (en) * 1989-06-26 1991-01-02 Stork Plastics Machinery B.V. Injector head
US5256047A (en) * 1991-12-03 1993-10-26 Nitrojection Corporation Gas assisted injection molding apparatus utilizing sleeve and pin arrangement
USRE35705E (en) * 1991-12-03 1997-12-30 Nitrojection Corporation Gas assisted injection molding apparatus utilizing sleeve and pin arrangement
US5284429A (en) * 1992-05-07 1994-02-08 Cascade Engineering, Inc. Gas-assisted injection molding apparatus

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