WO1989005225A1 - Process and device for making plastic mouldings - Google Patents

Process and device for making plastic mouldings Download PDF

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Publication number
WO1989005225A1
WO1989005225A1 PCT/CH1988/000222 CH8800222W WO8905225A1 WO 1989005225 A1 WO1989005225 A1 WO 1989005225A1 CH 8800222 W CH8800222 W CH 8800222W WO 8905225 A1 WO8905225 A1 WO 8905225A1
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WO
WIPO (PCT)
Prior art keywords
mold
cavities
gas
flow paths
parting
Prior art date
Application number
PCT/CH1988/000222
Other languages
German (de)
French (fr)
Inventor
Hans-Ulrich Hauser
Original Assignee
Bucher-Guyer Ag Maschinenfabrik
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 Bucher-Guyer Ag Maschinenfabrik filed Critical Bucher-Guyer Ag Maschinenfabrik
Publication of WO1989005225A1 publication Critical patent/WO1989005225A1/en

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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
    • B29C45/34—Moulds having venting means
    • 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
    • B29C45/1701—Component parts, details or accessories; Auxiliary operations using a particular environment during moulding, e.g. moisture-free or dust-free

Definitions

  • the invention relates to a process for the production of molded parts made of plastic, primarily from thermosets or thermoplastics, by injection molding or injection molding, and to a device for carrying out the process with a multi-part mold provided for opening and closing, which is the plastic is supplied in a flowable state.
  • the cavities are evacuated before filling in order to remedy this malfunction, in order in this way to remove any remaining gas.
  • burns occur, inter alia, at the ends of the flow path, in particular in areas which are difficult to vent, in the region of ribs, bends, chimneys or in tight spaces and cause visual and physical defects.
  • the precautions taken so far are inadequate and hinder the manufacture of the molded parts.
  • the object of the present invention aims to eliminate the deficiencies mentioned and, in the case of a method of the type mentioned at the outset, requires reliable production of high-quality molded parts from plastic at favorable cost ratios.
  • this object is achieved in that the cavities and flow paths, as well as parting planes of a mold, are rinsed with non-reacting gas before the latter is filled.
  • the flushing can also be carried out in the case of a gap in the parting plane of the molded parts, as a result of which accelerated gas exchange can be achieved.
  • the mold can advantageously be closed during the rinsing or evacuation of the cavities and flow paths, so as to exclude the external conditions of the cavities and flow paths thereafter.
  • Suitable as non-reacting gases for flushing the cavities and flow paths are, for example, inert gases, nitrogen ⁇ toff, CO2 r argon, combustion gas and styrene vapor in the plastic aces, that is to say those gases which do not undergo or leave an oxidation effect with the hardening molding compound or its vapors.
  • the device for carrying out the method with a multi-part shape and a filling device for introducing a plastic mass is characterized according to the invention by a source of non-reacting gas which is optionally connected to the cavities and flow paths which can be connected to a vacuum source, and to separating surfaces of the form .
  • the sprue channels of the mold are advantageously provided for supplying non-reacting gas and / or for evacuating the cavities and flow paths, as a result of which no special precautions need to be taken on the mold side.
  • an inlet and / or outlet opening for the gases opening into the cavities and / or flow paths of the mold could also be provided in the region of the mold parting plane.
  • a chamber is provided for gas exchange with the cavities and the flow paths, which chamber can be connected to a line which does not react with gas and tightly surrounds the injection unit in the area of its front end.
  • the warm molding tools cause the gas between the molded parts to rise and leave the mold on the upper side. Therefore, in order to promote the rinsing effect, it is advantageous if the openings formed at least on the side surfaces and the underside of the mold are designed to be coverable. Of course, the shape in the area of the openings could be completely enclosed and have a feed opening and an outlet opening for the gas.
  • a surround is at least to be provided, which surrounds it tightly at least laterally and at the bottom, so that the non-reacting gases, which are flushed with combustible gases, can escape upwards supported by the heat of the mold.
  • the inlet opening for the unreactive gas at the bottom of the mold must be selected.
  • An outlet opening which may be provided and can be connected to a vacuum source, is to be provided in the region of the upper side of the mold.
  • the provided border can be attached to the movable as well as to the stationary molded part and projecting beyond the separating surfaces thereof in the direction of movement.
  • the single figure shows a partial longitudinal section through an injection molding machine in the deformation area.
  • an injection molding machine is used, the heatable plasticizing injection cylinder 1 of which lies with the front end of the nozzle 2 at the mouth of the gate 3 of a two-part mold 4.
  • This is to be flushed with unreactive gas before filling with the plastic compound from the plasticizing injection cylinder 1, so that combustible gases present in the mold cavities 5, flow paths 3 and between the separating surfaces 6 are broken down or displaced.
  • the separating surfaces 6 of the mold 4 which here consists of two parts 7, 8, can be lifted off from one another, the mold separating gap advantageously being chosen as narrowly as possible so that the deep cavities can also be reached when flushing with non-reacting gases.
  • a subsequent evacuation serves to optimize gas-emptied mold cavities, the unreacted gases proving to be the carriers of the combustible gases.
  • the mold 4 must be closed in the course of the flushing, so that additional turbulence improves the flushing of the mold cavities 3, 5, 6.
  • the device for carrying out the method is characterized in that the cavities 5, flow paths 3 and the separating surfaces 6 of the mold 4 used are pipeline-connected to a source 8 of non-reacting gas.
  • the unreacted gas could get into the mold cavities from a pressure accumulator by expansion by means of a valve or with the aid of a pump, for which purpose a line 10 is required.
  • a simple embodiment of the device according to the invention is achieved if the inlet openings of the sprue channels 3 are connected to the source 9 of the non-reacting gas and then the evacuation is also carried out via these connections.
  • inlet and / or outlet openings for the gases can be assigned to the mold parting planes or mold parting surfaces in order to be able to easily and effectively reach the mold cavities with the unreacted gas.
  • a further embodiment of the device according to the invention can be achieved by a chamber 12 provided on the back of the mold mounting plate 11 carrying the molded part 7, 8, which is used for gas exchange with the cavities 5, the flow paths 3 and / or the spaced apart
  • the separating surface 6 of the molded parts 7, 8 communicates and is connected to a line 10 and / or vacuum line which does not react with gas.
  • this chamber 12 can be designed such that the injection unit 1 can be moved longitudinally in it.
  • the opening provided for the injection opening in the chamber 12 is provided with a seal.
  • mold openings which are formed by slightly spaced separating surfaces 6 of the mold parts 7, 8, there are at least to the side and below the mold 4, the mold openings of which cover, sealed bezels 13 are provided.
  • the gas inlet and / or outlet opening is then expediently arranged in the lower region of this enclosure 13, as a result of which the rising gases can be used.

Abstract

In a process for making plastic mouldings by injection moulding or transfer moulding, the cavities (5), die channels (3) and land faces (6) of a mould (4) are flushed with a gas inert to the injected plastics material and to its vapour. Also described is a device having a chamber (12) on the rear side of the mould clamping plate (11) for the gate (7, 8), to permit gas exchange in the mould cavities (5, 3, 6).

Description

Verfahren zur Herstellung von Formteilen aus Kunststoff und Einrichtung zur Durchführung desselben Process for producing molded parts from plastic and device for carrying out the same
Die Erfindung betrifft ein Verfahren zur Herstellung von Formteilen aus Kunststoff, vornehmlich aus Duro- oder Thermoplasten, durch Spritzgiessen oder Spritz¬ pressen sowie eine Vorrichtung zur Durchführung des Ver¬ fahrens mit einer zum Oeffnen und Schliessen vorgesehe¬ nen, mehrteiligen Form, welcher der Kunststoff in fliess- fähigem Zustand zugeführt wird.The invention relates to a process for the production of molded parts made of plastic, primarily from thermosets or thermoplastics, by injection molding or injection molding, and to a device for carrying out the process with a multi-part mold provided for opening and closing, which is the plastic is supplied in a flowable state.
Bei verschiedenen bekannten Verfahren treten während oder unmittelbar nach dem Spritzgiessvorgang an der Ober¬ fläche der For linge Beschädigungen auf, die u.a. auf Verbrennungen oder Korrosionen zurückzuführen sind. Grund dazu sind Gase der Kunststoffmasse oder von Lö¬ sungsmitteln, die sich in den Formhohlräumen abgesetzt haben oder an diesem Rahmen nicht flüchten können.In various known methods, damage occurs on the surface of the molds during or immediately after the injection molding process, which damages are due to burns or corrosion. The reason for this are gases from the plastic mass or from solvents which have settled in the mold cavities or cannot escape from this frame.
Zur Behebung dieses Miεsstandes werden bekanntlich die Hohlräume vor dem Befüllen evakuiert, um auf diese Weise vorhandene Restgaεe zu entfernen.As is known, the cavities are evacuated before filling in order to remedy this malfunction, in order in this way to remove any remaining gas.
Weitere bekannte Masεnah en sind das Anbringen zusätz¬ licher Entlüftungsschlitze an der Form oder eine ent¬ sprechende Ausbildung der AuswerfVorrichtung, die ei¬ nem Entweichen der Gase förderlich sein kann.Further known measures are the addition of additional ventilation slots to the mold or a corresponding design of the ejection device, which can promote the escape of the gases.
Dennoch treten u.a. an den Fliesswegenden, insbesondere an schlecht entlüftbaren Stellen, im Bereich von Rippen, Krümmungen, Kaminen oder räumlich engen Verhältnissen Verbrennungen auf und verursachen optische und physika¬ lische Mängel. Die bisher getroffenen Vorkehrungen sind erfahrungεge- äss unzureichend und behindern die Fertigung der Form¬ teile.Nevertheless, burns occur, inter alia, at the ends of the flow path, in particular in areas which are difficult to vent, in the region of ribs, bends, chimneys or in tight spaces and cause visual and physical defects. Experience has shown that the precautions taken so far are inadequate and hinder the manufacture of the molded parts.
Die Aufgabe der vorliegenden Erfindung strebt die Be¬ seitigung der erwähnten Mängel an und fordert bei ei¬ nem Verfahren der eingangs genannten Art eine zuverläs¬ sige Herstellung hochwertiger Formteile aus Kunststoff unter günstigen Kostenverhältnissen.The object of the present invention aims to eliminate the deficiencies mentioned and, in the case of a method of the type mentioned at the outset, requires reliable production of high-quality molded parts from plastic at favorable cost ratios.
Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass die Hohlräume und Fliesεwege εowie Trennebenen einer Form vor dem Befüllen letzterer mit nicht reagierendem Gaε gespült werden.According to the invention, this object is achieved in that the cavities and flow paths, as well as parting planes of a mold, are rinsed with non-reacting gas before the latter is filled.
Dadurch können vorhandene Restgasmengen oder die mit der Kunststoffmasse in die Form eindringenden Gase ab¬ gebaut und/oder verdrängt werden.Existing residual gas quantities or the gases penetrating into the mold with the plastic mass can thereby be broken down and / or displaced.
Die Durchspülung kann auch bei einem Spalt in der Trenn¬ ebene der Formteile durchgeführt werden, wodurch ein geεchleunigter Gasaustausch erzielt werden kann.The flushing can also be carried out in the case of a gap in the parting plane of the molded parts, as a result of which accelerated gas exchange can be achieved.
Besonders günstig erweist es sich, wenn anεchliessend an daε Spülen der Form letztere evakuiert wird, um da¬ durch die durch das Spülen mit nicht reagierenden Ga¬ sen eingetretene Verdünnung allfälliger Restgase wei¬ ter abbauen zu können.It proves to be particularly favorable if the mold is subsequently evacuated from the purging in order to be able to further break down any residual gases that may have occurred as a result of purging with non-reacting gases.
Vorteilhaft kann die Form während dem Spülen bzw. Eva¬ kuieren der Hohlräume und Fliesswege geschlossen wer¬ den, um so die Aussenverhaltnisse auf die Hohlräume und Fliesswege danach auszuschliessen.The mold can advantageously be closed during the rinsing or evacuation of the cavities and flow paths, so as to exclude the external conditions of the cavities and flow paths thereafter.
Zum Spülen der Hohlräume und Fliesswege eignen sich als nicht reagierende Gase beiεpielεweiεe Inertgaεe, Stick- εtoff, CO2 r Argon, Verbrennungεgaεe und Styroldampf in der Kunststoff asse, also solche Gase, die keinen Oxi- dationεeffekt mit der aushärtenden Formmaεse bzw. de¬ ren Dämpfe eingehen bzw. hinterlassen.Suitable as non-reacting gases for flushing the cavities and flow paths are, for example, inert gases, nitrogen εtoff, CO2 r argon, combustion gas and styrene vapor in the plastic aces, that is to say those gases which do not undergo or leave an oxidation effect with the hardening molding compound or its vapors.
Die Einrichtung zur Durchführung des Verfahrens mit ei¬ ner mehrteiligen Form und einer Einfülleinrichtung zum Einbringen einer Kunststoffmasse ist erfindungsgemäεs gekennzeichnet durch eine Quelle nicht reagierender Gaεe, die mit den an eine Vakuumquelle anschliesεbaren Hohl¬ räumen und Flieεεwegen sowie Trennflächen der Form wahl- weiεe leitungεverbunden iεt.The device for carrying out the method with a multi-part shape and a filling device for introducing a plastic mass is characterized according to the invention by a source of non-reacting gas which is optionally connected to the cavities and flow paths which can be connected to a vacuum source, and to separating surfaces of the form .
Vorteilhaft sind zur Zuführung nicht reagierender Gaεe und/oder zur Evakuierung der Hohlräume und Fliesswege die Angusεkanäle der Form vorgesehen, wodurch formseits keine besonderen Vorkehrungen zu treffen sind.The sprue channels of the mold are advantageously provided for supplying non-reacting gas and / or for evacuating the cavities and flow paths, as a result of which no special precautions need to be taken on the mold side.
Alternativ könnte auch eine in die Hohlräume und/oder Fliesswege der Form mündende Ein- und/oder Auεlassöff- nung für die Gase im Bereich der Formtrennebene vorge- εehen εein.Alternatively, an inlet and / or outlet opening for the gases opening into the cavities and / or flow paths of the mold could also be provided in the region of the mold parting plane.
Besonders günstig erweist es εich, wenn an der Rückεeite der den mit dem Anguεssyεtem versehenen Formteil tragen¬ den Aufspannplatte eine zum Gasaustausch mit den Hohl¬ räumen und den Fliesswegen verbundene Kammer vorgesehen ist, die mit einer nicht reagierendes Gas führenden Lei¬ tung verbindbar ist und die Einspritzeinheit im Bereich ihres vorderen Endes dicht umgibt.It proves to be particularly favorable if, on the rear side of the clamping plate carrying the molded part provided with the sprue system, a chamber is provided for gas exchange with the cavities and the flow paths, which chamber can be connected to a line which does not react with gas and tightly surrounds the injection unit in the area of its front end.
Durch die warmen Formwerkzeuge εteigen die εich zwiεchen den Formteilen befindenden Gaεe auf und verlassen die Form an der Oberεeite. Deεhalb iεt es zur Begünstigung des Spüleffektes vorteilhaft, wenn die durch die Trenn- flächen gebildeten Oeffnungen wenigstens an den Seiten¬ flächen und der Unterseite der Form abdeckbar ausgebil¬ det sind. Selbstverständlich könnte die Form im Bereich der Oeffnungen vollständig umschlossen sein und eine Zuführöffnung und eine Auslassöffnung für das Gas be¬ sitzen.The warm molding tools cause the gas between the molded parts to rise and leave the mold on the upper side. Therefore, in order to promote the rinsing effect, it is advantageous if the openings formed at least on the side surfaces and the underside of the mold are designed to be coverable. Of course, the shape in the area of the openings could be completely enclosed and have a feed opening and an outlet opening for the gas.
Zu diesem Zwecke eignen sich vornehmlich bei geöffneter Form, eine letztere wenigstens seitlich und unten dicht umgebende Einfassung, so dasε die durch die Spülung mit brennbaren Gasen belasteten nicht reagierenden Gase un¬ terstützt durch die Wärme der Form nach oben entweichen können.For this purpose, when the mold is open, a surround is at least to be provided, which surrounds it tightly at least laterally and at the bottom, so that the non-reacting gases, which are flushed with combustible gases, can escape upwards supported by the heat of the mold.
Im Sinne einer optimalen Wirkung, ist die Zuführöffnung für das nicht reagierende Gas an der Unterseite der Form zu wählen.In order to achieve an optimal effect, the inlet opening for the unreactive gas at the bottom of the mold must be selected.
Eine allenfalls vorzusehende, mit einer Vakuumquelle verbindbare Austrittsöffnung ist im Bereich der Ober¬ seite der Form vorzusehen.An outlet opening, which may be provided and can be connected to a vacuum source, is to be provided in the region of the upper side of the mold.
Die vorgesehene Einfassung kann sowohl an dem bewegli¬ chen wie auch an dem stationären Formteil und in Bewe¬ gungsrichtung über die Trennflächen dieser hinaus vor¬ stehend befestigt sein.The provided border can be attached to the movable as well as to the stationary molded part and projecting beyond the separating surfaces thereof in the direction of movement.
Das erfindungsge ässe Verfahren und die Einrichtung zur Durchführung letzterens werden nachfolgend anhand eines in der Zeichnung dargestellten Beispiels näher erläutert.The inventive method and the device for carrying out the latter are explained in more detail below with reference to an example shown in the drawing.
Die einzige Figur zeigt einen teilweisen Längsschnitt durch eine Spritzgiesεmaschine im Verformungsbereich.The single figure shows a partial longitudinal section through an injection molding machine in the deformation area.
Bei dem erfindungsgemässen Verfahren zur Herstellung von Formteilen aus Kunststoff wird, wie die einzige Fi- gur zeigt, eine Spritzgieεsmaschine verwendet, deren beheizbarer Plaεtifizier-Spritzzylinder 1 mit dem vor¬ deren Ende der Düεe 2 an der Mündung deε Anguεseε 3 ei¬ ner zweiteiligen Form 4 anliegt. Diese soll vor dem Be- füllen mit der Kunststoffmasse aus dem Plastifizier- Spritzzylinder 1 mit nicht reagierendem Gas gespült wer¬ den, so dass vorhandene brennbare Gase in den Formhohl¬ räumen 5, Fliesswegen 3 und zwischen den Trennflächen 6 abgebaut bzw. verdrängt werden. Zu diesem Zwecke kön¬ nen die Trennflächen 6 der hier aus zwei Teilen 7, 8 bestehenden Form 4 voneinander abgehoben werden, wobei der Formtrennspalt vorteilhaft möglichst eng zu wählen ist, damit beim Spülen mit nicht reagierenden Gasen auch die tiefen Hohlräume erreichbar sind. Ein anschlieεsendes Evakuieren dient der Optimierung gaεentleerter Formhohlräume, wobei die nicht reagieren¬ den Gaεe εich als Träger der brennbaren Gase erweisen.In the method according to the invention for producing molded parts made of plastic, like the only fi gur shows, an injection molding machine is used, the heatable plasticizing injection cylinder 1 of which lies with the front end of the nozzle 2 at the mouth of the gate 3 of a two-part mold 4. This is to be flushed with unreactive gas before filling with the plastic compound from the plasticizing injection cylinder 1, so that combustible gases present in the mold cavities 5, flow paths 3 and between the separating surfaces 6 are broken down or displaced. For this purpose, the separating surfaces 6 of the mold 4, which here consists of two parts 7, 8, can be lifted off from one another, the mold separating gap advantageously being chosen as narrowly as possible so that the deep cavities can also be reached when flushing with non-reacting gases. A subsequent evacuation serves to optimize gas-emptied mold cavities, the unreacted gases proving to be the carriers of the combustible gases.
Im Verlauf des Spülens ist die Form 4 zu schliessen, sodasε eine zuεätzliche Turbulenz die Spülung der Form¬ hohlräume 3, 5, 6 verbeεsert.The mold 4 must be closed in the course of the flushing, so that additional turbulence improves the flushing of the mold cavities 3, 5, 6.
Die Einrichtung zur Durchführung deε Verfahrens zeich¬ net εich dadurch aus, daεε die Hohlräume 5, Flieεεwege 3 und die Trennflächen 6 der verwendeten Form 4 mit ei¬ ner Quelle 8 nicht reagierenden Gases leitungsverbunden sind. Das nicht reagierende Gaε könnte auε einem Druck¬ speicher durch Entspannung mittels eines Ventils oder mit Hilfe einer Pumpe in die Formhohlräume gelangen, wozu eine Leitung 10 erforderlich ist.The device for carrying out the method is characterized in that the cavities 5, flow paths 3 and the separating surfaces 6 of the mold 4 used are pipeline-connected to a source 8 of non-reacting gas. The unreacted gas could get into the mold cavities from a pressure accumulator by expansion by means of a valve or with the aid of a pump, for which purpose a line 10 is required.
Eine einfache Ausführungsform der erfindungsgemäsεen Einrichtung wird dann erreicht, wenn die Einlaεsöffnun- gen der Angusskanäle 3 mit der Quelle 9 der nicht rea¬ gierenden Gaεe verbunden werden und danach auch die Eva- kuation über dieεen Anεchluεs durchgeführt wird. Alternativ können Ein- und/oder Auεlassöffnungen für die Gase den Formtrennebenen bzw. Formtrennflächen- 6 zugeordnet sein, um auf einfache Art und effektiv die Formhohlräume mit dem nicht reagierenden Gas erreichen zu können.A simple embodiment of the device according to the invention is achieved if the inlet openings of the sprue channels 3 are connected to the source 9 of the non-reacting gas and then the evacuation is also carried out via these connections. Alternatively, inlet and / or outlet openings for the gases can be assigned to the mold parting planes or mold parting surfaces in order to be able to easily and effectively reach the mold cavities with the unreacted gas.
Eine weitere Ausführungsform der erfindungsgemäεsen Einrichtung kann durch eine an der Rückseite der den mit dem Angusssystem versehenen Formteil 7, 8 tragen¬ den Formaufspannplatte 11 vorgesehene Kammer 12 erzielt werden, die für den Gasauεtauεch mit den Hohlräumen 5, den Fliesswegen 3 und/oder den beabstandeten Trennflä¬ chen 6 der Formteile 7, 8 kommuniziert und mit einer nicht reagierendes Gas führenden Leitung 10 und/oder Vakuumleitung weiterverbunden ist. Diese Kammer 12 kann, wie in der einzigen Figur dargestellt, so auεgebildet sein, daεs die Einspritzeinheit 1 in ihr längsbeweglich iεt. Zu dieεem Zwecke iεt die für die Einεpritzöffnung vorgeεehene Oeffnung in der Kammer 12 mit einer Dich¬ tung versehen.A further embodiment of the device according to the invention can be achieved by a chamber 12 provided on the back of the mold mounting plate 11 carrying the molded part 7, 8, which is used for gas exchange with the cavities 5, the flow paths 3 and / or the spaced apart The separating surface 6 of the molded parts 7, 8 communicates and is connected to a line 10 and / or vacuum line which does not react with gas. As shown in the single figure, this chamber 12 can be designed such that the injection unit 1 can be moved longitudinally in it. For this purpose, the opening provided for the injection opening in the chamber 12 is provided with a seal.
Bei durch geringfügig beabstandete Trennflächen 6 der Formteile 7, 8 entstehende Formöffnungen sind wenigs¬ tens seitlich und unter der Form 4, deren Formöffnung abdeckende, dichte Einfasεungen 13 vorgeεehen. Zweckmässig ist dann die Gasein- und/oder Austrittsöff¬ nung im unteren Bereich dieser Einfassung 13 angeordnet, wodurch das Aufsteigen der sich erwärmenden Gase ausge¬ nutzt werden kann.In the case of mold openings which are formed by slightly spaced separating surfaces 6 of the mold parts 7, 8, there are at least to the side and below the mold 4, the mold openings of which cover, sealed bezels 13 are provided. The gas inlet and / or outlet opening is then expediently arranged in the lower region of this enclosure 13, as a result of which the rising gases can be used.
Aus diesem Grunde erscheint es vorteilhaft, wenn die Evakuierung im oberen Bereich der Form 4 angesetzt wird.For this reason, it appears advantageous if the evacuation is set in the upper area of the form 4.
Bei dem über beabstandete Formteile 7, 8 inszinierten Gaεauεtausch ist die Einfasεung 13 an einem der Form- teile 7, 8 befestigt und ragt in Bewegungsrichtung über deεεen Trennfläche 6 hinauε, derart, daεε sie mit der Dichtungsanordnung an dem anderen Formteil 7, 8 eine dichte Verbindung bildet. In the case of gas exchange, which is inspired by spaced-apart molded parts 7, 8, the bezel 13 is located on one of the molded parts. Parts 7, 8 fastened and protrudes in the direction of movement over their separating surface 6, such that they form a tight connection with the sealing arrangement on the other molded part 7, 8.

Claims

P A T E N T A N S P R D E C H E PATENT CLAIM
1. Verfahren zur Herstellung von Formteilen aus Kunst¬ stoff, vornehmlich aus Duro- oder Thermoplasten, durch Spritzgiessen oder Spritzpressen, dadurch ge¬ kennzeichnet, dasε die Hohlräume (5) und Fliesswege (3) sowie Trennflächen (6) einer Form (4) vor dem Befüllen letzterer mit einem auf die eingespritzte Kunststoffmasεe bzw. auf deren Dämpfe nicht reagie¬ renden Gas oder Gaεgemiεch geεpült werden.1. A process for the production of molded parts from plastics, primarily from thermosets or thermoplastics, by injection molding or injection molding, characterized in that the cavities (5) and flow paths (3) and parting surfaces (6) of a mold (4) before filling the latter with a gas or gas mixture which does not react to the injected plastic mass or its vapors.
2. Verfahren nach Anεpruch 1, dadurch gekennzeichnet, daεε die Spülung bei abgehobenen Trennflächen (6) der Form (4) erfolgt.2. The method according to claim 1, characterized in that the rinsing takes place when the separating surfaces (6) of the mold (4) are lifted off.
3. Verfahren nach einem der Anεprüche 1 und 2, dadurch gekennzeichnet, daεε die Hohlräume (5) und Flieεε- wege (3) sowie Trennebenen (6) nach dem Spülen eva¬ kuiert werden.3. The method according to one of claims 1 and 2, characterized in that the cavities (5) and flow paths (3) and parting planes (6) are evacuated after rinsing.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dasε die Form (4) während dem Spü¬ len der Hohlräume (5) und Fliesswege (3) geschlos¬ sen wird. 4. The method according to any one of claims 1 to 3, characterized in that the mold (4) is closed during the flushing of the cavities (5) and flow paths (3).
5. Einrichtung zur Durchführung deε Verfahrenε nach Anspruch 1, mit einer mehrteiligen Form und einer Einfülleinrichtung zum Einbringen einer Kunststoff- rnaεεe, dadurch gekennzeichnet, daεs die Hohlräume (5) und Fliesswege (3) sowie Trennflächen (6) ei¬ ner Form (4) mit einer Quelle (9) eines nicht rea¬ gierenden Gases leitungsverbunden sind.5. Device for performing the method according to claim 1, with a multi-part shape and a filling device for introducing a plastic rnaεεe, characterized in that the cavities (5) and flow paths (3) and parting surfaces (6) of a shape (4th ) are connected to a source (9) of a non-reacting gas.
6. Einrichtung nach Anspruch 5, dadurch gekennzeichnet, dasε die Einlaεεöffnungen der Anguεεkanäle (3) der Form (4) mit einer Quelle (9) eines nicht reagieren¬ den Gaseε verbunden εind.6. Device according to claim 5, characterized in that the inlet openings of the gate channels (3) of the mold (4) are connected to a source (9) of a non-reacting gas.
7. Einrichtung nach Anεpruch 5, dadurch gekennzeichnet, daεε die Ein- und/oder Auslaεsöffnungen für die Gaεe den Formtrennebenen bzw. Formtrennflächen (6) zuge¬ ordnet sind.7. Device according to claim 5, characterized in that the inlet and / or outlet openings for the gas are assigned to the mold parting planes or mold parting surfaces (6).
8. Einrichtung nach Anεpruch 5, dadurch gekennzeichnet, dass an der Rückεeite der den mit dem Angussεyεtem verεehenen Formteil (7, 8) tragenden Formaufspann- platte (11) eine für den Gaεauεtauεch mit den Hohl¬ räumen (5) und Fliesswegen (3) sowie den Formtrenn¬ flächen (6) verbundene Kammer (12) vorgesehen ist, die mit einer nicht reagierendes Gas führenden Lei¬ tung (10) verbindbar iεt und die Einspritzeinheit im Bereich ihres vorderen Endes dicht umgibt. 8. Device according to claim 5, characterized in that on the rear side of the mold mounting plate (11) carrying the molded part provided with the sprue system (7, 8), one for gas exchange with the cavities (5) and flow paths (3) and the chamber (12) connected to the mold parting surfaces (6) is provided, which can be connected to a line (10) which does not react with gas and which tightly surrounds the injection unit in the region of its front end.
9. Einrichtung nach Anεpruch 5, dadurch.gekennzeichnet, daεs die durch beabstandete Formteile (7, 8) gebil¬ deten Formöffnungen wenigstens seitlich und unten dicht abdeckbar sind.9. Device according to claim 5, characterized. Characterized in that the molded openings formed by spaced molded parts (7, 8) can be covered at least laterally and at the bottom.
10. Einrichtung nach Anspruch 9, dadurch gekennzeichnet, dass eine die Form (4) im Bereich der Trennungsflä¬ chen (6) wenigstens seitlich und unten dicht umge¬ bende Einfassung (13) vorgesehen ist.10. The device according to claim 9, characterized in that a mold (4) in the region of the separation surfaces (6) is provided at least laterally and at the bottom surrounding area (13).
11. Einrichtung nach einem der Ansprüche 9 und 10, da¬ durch gekennzeichnet, dasε die Zuführöffnung der nicht reagierenden Gaεe im unteren Bereich der Ein- fassung (13) angeordnet ist.11. Device according to one of claims 9 and 10, characterized by the fact that the feed opening of the non-reacting gas is arranged in the lower region of the border (13).
12. Einrichtung nach einem der Ansprüche 5 biε 11, da¬ durch gekennzeichnet, daεε die zur Evakuierung der Form (4) im Bereich der For oberεeite vorgeεehen iεt.12. Device according to one of claims 5 to 11, characterized by the fact that the upper part is provided for evacuating the mold (4) in the area of the mold.
13. Einrichtung nach einem der Ansprüche 9 biε 11, da¬ durch gekennzeichnet, dasε die Einfassung (13) an einem der Formteile (7, 8) und in Bewegungεrich- tung über die Trennflächen (6) dieser hinaus vor¬ stehend befestigt ist. 13. Device according to one of claims 9 to 11, characterized by the fact that the border (13) is attached to one of the molded parts (7, 8) and protrudes in the direction of movement beyond the separating surfaces (6).
PCT/CH1988/000222 1987-12-04 1988-12-01 Process and device for making plastic mouldings WO1989005225A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH474487 1987-12-04
CH4744/87-1 1987-12-04

Publications (1)

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WO1989005225A1 true WO1989005225A1 (en) 1989-06-15

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EP2363265A1 (en) * 2010-03-02 2011-09-07 Linde AG Method for injection moulding plastic pieces
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CN114179307A (en) * 2021-11-29 2022-03-15 葛洪三 Injection molding method
CN114179300A (en) * 2021-11-29 2022-03-15 葛洪三 Injection mold and injection molding system

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CN114179307A (en) * 2021-11-29 2022-03-15 葛洪三 Injection molding method
CN114179300A (en) * 2021-11-29 2022-03-15 葛洪三 Injection mold and injection molding system

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