EP0868985B1 - Mould for pressing articles from plastic masses - Google Patents

Mould for pressing articles from plastic masses Download PDF

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Publication number
EP0868985B1
EP0868985B1 EP19970105311 EP97105311A EP0868985B1 EP 0868985 B1 EP0868985 B1 EP 0868985B1 EP 19970105311 EP19970105311 EP 19970105311 EP 97105311 A EP97105311 A EP 97105311A EP 0868985 B1 EP0868985 B1 EP 0868985B1
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EP
European Patent Office
Prior art keywords
mould
mold
edge strips
voltage source
edge
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.)
Expired - Lifetime
Application number
EP19970105311
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German (de)
French (fr)
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EP0868985A1 (en
Inventor
Rainer Dipl.-Ing. Händle (FH)
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.)
RIETER-WERKE GMBH
Original Assignee
Rieter-Werke Handle & Co KG GmbH
Rieter Werke Haendle GmbH
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Filing date
Publication date
Application filed by Rieter-Werke Handle & Co KG GmbH, Rieter Werke Haendle GmbH filed Critical Rieter-Werke Handle & Co KG GmbH
Priority to EP19970105311 priority Critical patent/EP0868985B1/en
Priority to DE59700058T priority patent/DE59700058D1/en
Priority to ES97105311T priority patent/ES2125730T3/en
Priority to PCT/EP1998/001736 priority patent/WO1998043793A1/en
Priority to IDP980448A priority patent/ID20113A/en
Publication of EP0868985A1 publication Critical patent/EP0868985A1/en
Application granted granted Critical
Publication of EP0868985B1 publication Critical patent/EP0868985B1/en
Priority to GR990400877T priority patent/GR3029789T3/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in, or on conveyors irrespective of the manner of shaping
    • B28B5/10—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in, or on conveyors irrespective of the manner of shaping in moulds carried on the circumference of a rotating drum
    • B28B5/12—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in, or on conveyors irrespective of the manner of shaping in moulds carried on the circumference of a rotating drum intermittently rotated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/04—Discharging the shaped articles
    • B28B13/06—Removing the shaped articles from moulds
    • B28B13/065—Removing the shaped articles from moulds by applying electric current or other means of discharging, e.g. pneumatic or hydraulic discharging means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/36—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article
    • B28B7/364—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article of plastic material or rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/44—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for treating with gases or degassing, e.g. for de-aerating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/46—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for humidifying or dehumidifying

Definitions

  • the invention relates to a mold for pressing moldings from plastic masses, especially ceramic Material according to the preamble of claim 1.
  • the invention has for its object a form for To create moldings from plastic masses, the mold halves made of composite material with a metal Support part and a shaping core made of synthetic resin and nevertheless by applying electrical current a detachment of the pressed molded body from the mold easier.
  • the two edge strips have the mold halves in the closed state of the mold distance filled by the ceramic mass.
  • a voltage source is connected on one of the side moldings and on the other half of the mold. Then electricity flows from the sidebar over the ceramic mass between the two sidebars, the second sidebar and its current-carrying Connections to the metal support part of the others Mold half.
  • This process can be done by reversing the polarity Voltage source, preferably a DC voltage source be repeated. Surprisingly, this is enough "Electric shocks" generated only in the edge area of the mold halves Removal effect for detaching the molded body from the Mold halves after the pressing process.
  • the negative pole in succession via a changeover relay to the sidebar of one half of the mold and the other Half of the mold is created.
  • the edge strips are preferably in an area outside of the mold cavity and thus surround the mold cavity.
  • an upper shape has a support part 2 made of a Aluminum alloy and a core 4 made of synthetic resin on the cavity side of an intermediate layer made of a rubber blanket 6 is spanned.
  • An edge strip 8 made of chrome-nickel steel is by means of countersunk screws 10 against Support part 2 and the core 4 while clamping the edge 12 of the blanket 6 stretched.
  • the sidebar 8 runs around the Shape around.
  • the lower mold has the same structure as that Upper form, and its components are therefore the same Reference numbers referred to, but indexed with a dash are. So the lower mold has a support part 2 'from one Aluminum alloy with a 4 'core made of synthetic resin is lined. The mold cavity side of the core 4 'is covered by a preformed rubber membrane 6 '. The edge 12 'of this rubber membrane is by means of an edge strip 8' Countersunk screws 10 'clamped to the support part 2'. The Countersunk screws 10, 10 'are with their heads 11, 11' in the edge strips 8, 8 'arranged sunk.
  • holes 3, 3 ' are provided in the support parts 2, 2', through which a suction effect can be exerted, which through the porous cores 4, 4 'through the rubber blanket 6 or the rubber membrane 6 'can communicate.
  • At least one of the support parts 2, 2 ', in the exemplary embodiment shown the lower support part 2 'and the associated one Core 4 'with rubber membrane 6' are made of hollow screws 16.17 interspersed with a hose assembly 18 to a passage 19 in the support part 2 'for discharging Air and / or water from the mold cavity are tightly connected are.
  • fine openings in the Area of the holes 3,3 'in the rubber membranes 6,6' provided be so that then a suction of air and / or water is made possible from the mold cavity via the holes 3,3 '.

Abstract

Eine Form zum Pressen von Formkörpern (13) aus keramischem Material weist zwei Formhälften auf, die jeweils ein Stützteil (2,2') aus Leichtmetall oder einer Leichtmetallegierung und einen Kern (4,4') aus Kunstharz und je eine formhohlraumseitige, metallene Randleiste (8,8') aufweisen. Diese Randleisten (8,8') sind mit der zugehörigen Formhälfte elektrisch leitend verbunden, und eine der Randleisten ist mit einem Pol einer elektrischen Spannungsquelle verbindbar, deren anderer Pol mit der jeweils anderen Formhälfte verbindbar ist. Die Randleisten (8,8') der beiden Formhälften haben in geschlossenem Zustand der Form einen durch die plastische Masse ausgefüllten Abstand (14) voneinander, über den bei Anlegen einer Spannung Strom fließt, so daß durch den dabei erzeugten Elektro-Schock eine Ablösewirkung des Formkörpers von der betreffenden Formhälfte erzielt ist. <IMAGE>A mold for pressing molded bodies (13) made of ceramic material has two mold halves, each of which has a supporting part (2,2 ') made of light metal or a light metal alloy and a core (4,4') made of synthetic resin and each has a metal edge strip on the mold cavity side (8,8 '). These edge strips (8, 8 ') are electrically conductively connected to the associated mold half, and one of the edge strips can be connected to a pole of an electrical voltage source, the other pole of which can be connected to the other mold half. The edge strips (8,8 ') of the two mold halves have in the closed state of the mold a distance (14) filled by the plastic mass, over which current flows when a voltage is applied, so that the electrical shock generated thereby has a detaching effect on the Shaped body is achieved by the relevant mold half. <IMAGE>

Description

Die Erfindung betrifft eine Form zum Pressen von Formkörpern aus plastischen Massen, insbesondere keramischem Material gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a mold for pressing moldings from plastic masses, especially ceramic Material according to the preamble of claim 1.

Bei einer bekannten Form dieser Art (DE-B-1 224 649) sind die Ränder jeweils einteilig mit dem zugehörigen metallenen Stützteil ausgebildet.In a known form of this type (DE-B-1 224 649) the edges each in one piece with the associated metal Support part trained.

Es ist auch ein Verfahren zum Ablösen gepreßter Formkörper aus plastischen, insbesondere keramischen Massen bekannt, bei der zwei elektrisch gegeneinander isolierte, metallene Formhälften nacheinander mit dem Minuspol einer elektrischen Gleichspannungsquelle verbunden werden (DE-B- 1 052 290), um so durch Elektro-Schockwirkung ein Ablösen des gepreßten Formkörpers von der jeweiligen Formhälfte zu bewirken.It is also a process for detaching molded articles known from plastic, especially ceramic, in which two metal ones are electrically insulated from each other Mold halves one after the other with the negative pole of an electrical DC voltage source can be connected (DE-B-1 052 290), so that a detachment of the to effect molded body from the respective mold half.

Auf dem Gebiet der Ziegelherstellung ist die Entwicklung in den vergangenen Jahrzehnten von der reinen Metallform aus Vollmaterial zu Verbundformen übergegangen, bei denen jede Formhälfte ein Stützteil aus Leichtmetall oder einer Leichtmetallegierung, insbesondere einer Aluminiumlegierung, und einen Kern aus Kunstharz aufweist, dessen dem Formhohlraum zugewandte Seite die Negativform des herzustellenden Formkörpers bildet. Diese Seite des Kerns wird mit einem Gummituch überspannt, das eine isolierende Zwischenlage zwischen der Form und dem zu pressenden Formkörper bildet. Grund für die Wahl von Kunstharz zum Herstellen der formgebenden Kerne war, daß Kunstharz bei einer Abänderung des herzustellenden Formkörpers viel leichter und billiger zu modifizieren ist als eine Vollmetallform. Jedoch bereitet das Ablösen des Formkörpers von einer solchen "Verbundform" Schwierigkeiten.In the field of brick production the development is in the past decades from the pure metal form Solid material transitioned to composite forms, each of which Molded a support part made of light metal or a Light metal alloy, in particular an aluminum alloy, and has a core made of synthetic resin, the Mold cavity side facing the negative shape of the one to be produced Shaped body forms. This side of the core will covered with a rubber blanket, which is an insulating liner between the mold and the molded body to be pressed forms. Reason for choosing synthetic resin to manufacture The shape of the cores was that resin was modified of the molded body to be manufactured much lighter and cheaper to be modified as a full metal form. However prepares the detachment of the molded body from such "Compound form" difficulties.

Bei der der wie beschrieben gestalteten Verbundform mit einem Stützteil aus Metall und mit einem Kunstharzkern als formgebendem Formteil und darüber gespanntem Gummituch besteht das Problem, daß weder Kunstharz noch Gummi elektrischen Strom leiten. Somit scheidet eine einfache Übernahme des bekannten Ablöseverfahrens mittels Elektro-Schockwirkung für solche Verbundformen aus.With the composite shape designed as described with a support part made of metal and with a synthetic resin core as shaping molding and there is stretched rubber blanket the problem that neither synthetic resin nor rubber electrical Conduct electricity. A simple takeover is therefore different the known detachment process by means of electro-shock effect for such composite shapes.

Der Erfindung liegt die Aufgabe zugrunde, eine Form zum Pressen von Formkörpern aus plastischen Massen zu schaffen, die Formhälften aus Verbundmaterial mit einem metallenen Stützteil und einen formgebenden Kern aus Kunstharz aufweist und gleichwohl durch Anlegen von elektrischem Strom ein Ablösen des gepreßten Formkörpers aus der Form erleichtert.The invention has for its object a form for To create moldings from plastic masses, the mold halves made of composite material with a metal Support part and a shaping core made of synthetic resin and nevertheless by applying electrical current a detachment of the pressed molded body from the mold easier.

Zur Lösung dieser Aufgabe dient Anspruch 1.To solve this problem, claim 1.

Bei der Form nach der Erfindung haben die beiden Randleisten der Formhälften in geschlossenem Zustand der Form einen durch die keramische Masse ausgefüllten Abstand voneinander. An eine der Randleisten und an die andere Formhälfte wird eine Spannungsquelle angeschlossen. Strom fließt dann von der Randleiste über die keramische Masse zwischen den beiden Randleisten, die zweite Randleiste und deren stromleitende Verbindungen zu dem metallenen Stützteil der anderen Formhälfte. Dieser Vorgang kann durch Umpolen der Spannungsquelle, vorzugsweise einer Gleichspannungsquelle wiederholt werden. Überraschenderweise genügt die so durch "Elektro-Schocks" allein im Randbereich der Formhälften erzeugte Ablösewirkung zum Ablösen des Formkörpers von den Formhälften nach dem Preßvorgang.In the form according to the invention, the two edge strips have the mold halves in the closed state of the mold distance filled by the ceramic mass. On one of the side moldings and on the other half of the mold a voltage source is connected. Then electricity flows from the sidebar over the ceramic mass between the two sidebars, the second sidebar and its current-carrying Connections to the metal support part of the others Mold half. This process can be done by reversing the polarity Voltage source, preferably a DC voltage source be repeated. Surprisingly, this is enough "Electric shocks" generated only in the edge area of the mold halves Removal effect for detaching the molded body from the Mold halves after the pressing process.

Ein Verfahren zum Lösen von Formkörpern aus plastischen Massen aus einer Form gemäß Patentanspruch 1 hat erfindungsgemäß die Merkmale des Anspruchs 9.A process for removing molded articles from plastic Masses from a mold according to claim 1 has according to the invention the features of claim 9.

Um Stromstöße gewünschter Dauer und Stärke auf die Oberform und die Unterform aufschalten zu können, wird eine Gleichspannungsquelle mit einer Spannung von vorzugsweise 60 V eingesetzt, deren Minuspol über ein Umschaltrelais nacheinander an die Randleiste der einen Formhälfte und die andere Formhälfte angelegt wird.For current surges of the desired duration and strength on the upper mold and being able to connect the lower mold becomes a DC voltage source with a voltage of preferably 60 V. used, the negative pole in succession via a changeover relay to the sidebar of one half of the mold and the other Half of the mold is created.

Die Randleisten bestehen beispielsweise aus Chrom-Nickel-Stahl.The edge strips are made of chrome-nickel steel, for example.

Vorzugweise sind die Randleisten in einem Bereich außerhalb des Formhohlraums angeordnet und umgeben somit den Formhohlraum.The edge strips are preferably in an area outside of the mold cavity and thus surround the mold cavity.

Die bei geschlossener Form in den Abstand zwischen den Randleisten in Form eines Streifens eingedrückte plastische Masse, welche eine Verbindung mit dem Formhohlkörper herstellt und bei Anlegen einer elektrischen Spannung den Strom über die Randleisten leitet, reicht überraschenderweise dazu aus, den Formhohlkörper von der betreffenden Formhälfte abzulösen. Der in dem Zwischenraum verbleibende streifenförmige Rest der plastischen Masse wird beim Öffnen der Form und Herausnehmen des Formkörpers von diesem abgetrennt oder fällt davon ab.The closed form in the distance between the Edge strips in the form of a strip indented plastic Mass that establishes a connection with the mold hollow body and when an electrical voltage is applied Surprisingly, current conducts over the edge strips from the hollow mold body of the concerned To detach the mold half. The one remaining in the space strip-like remainder of the plastic mass is when opened the shape and removal of the molded body separated from it or falls off.

Vorteilhaft werden Luft und/oder Wasser aus dem Formhohlraum durch Maßnahmen gemäß einem der Ansprüche 7 oder 8 abgesaugt.Air and / or water from the mold cavity are advantageous by measures according to one of claims 7 or 8 aspirated.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Further advantageous embodiments of the invention are in specified in the subclaims.

Die Erfindung ist im folgenden anhand schematischer Zeichnungen an einem Ausführungsbeispiel mit weiteren Einzelheiten näher erläutert. Es zeigen:

Fig. 1
einen Teilschnitt durch eine Form gemäß der Erfindung in geschlossenem Zustand,
Fig. 2
eine schematische Darstellung einer Trommelanordnung mit insgesamt fünf Unterformen und einer Oberform sowie eine Schaltungsanordnung zum Aufbringen von Spannungsstößen auf die Unterform und die Oberform, die im einzelnen gemäß Fig. 1 ausgebildet sind.
The invention is explained below with reference to schematic drawings of an embodiment with further details. Show it:
Fig. 1
3 shows a partial section through a mold according to the invention in the closed state,
Fig. 2
is a schematic representation of a drum assembly with a total of five lower molds and an upper mold and a circuit arrangement for applying voltage surges to the lower mold and the upper mold, which are designed in detail according to FIG. 1.

Gemäß Fig. 1 weist eine Oberform ein Stützteil 2 aus einer Aluminiumlegierung und einen Kern 4 aus Kunstharz auf, der formhohlraumseitig von einer Zwischenlage aus einer Gummituch 6 überspannt ist. Eine Randleiste 8 aus Chrom-Nickel-Stahl ist mittels Senkkopfschrauben 10 gegen das Stützteil 2 und den Kern 4 unter Einspannung des Randes 12 des Gummituches 6 gespannt. Die Randleiste 8 läuft um die Form um.1, an upper shape has a support part 2 made of a Aluminum alloy and a core 4 made of synthetic resin on the cavity side of an intermediate layer made of a rubber blanket 6 is spanned. An edge strip 8 made of chrome-nickel steel is by means of countersunk screws 10 against Support part 2 and the core 4 while clamping the edge 12 of the blanket 6 stretched. The sidebar 8 runs around the Shape around.

Die Unterform hat im Prinzip den gleichen Aufbau wie die Oberform, und ihre Bestandteile sind deshalb mit gleichen Bezugszahlen bezeichnet, die jedoch mit einem Strich indiziert sind. So hat die Unterform ein Stützteil 2' aus einer Aluminiumlegierung, das mit einem Kern 4' aus Kunstharz ausgekleidet ist. Die Formhohlraumseite des Kernes 4'ist von einer vorgeformten Gummimembran 6' bedeckt. Der Rand 12' dieser Gummimembran ist über eine Randleiste 8' mittels Senkkopfschrauben 10' mit dem Stützteil 2' verspannt. Die Senkkopfschrauben 10, 10' sind mit ihren Köpfen 11, 11'in den Randleisten 8, 8'versenkt angeordnet.In principle, the lower mold has the same structure as that Upper form, and its components are therefore the same Reference numbers referred to, but indexed with a dash are. So the lower mold has a support part 2 'from one Aluminum alloy with a 4 'core made of synthetic resin is lined. The mold cavity side of the core 4 'is covered by a preformed rubber membrane 6 '. The edge 12 'of this rubber membrane is by means of an edge strip 8' Countersunk screws 10 'clamped to the support part 2'. The Countersunk screws 10, 10 'are with their heads 11, 11' in the edge strips 8, 8 'arranged sunk.

Um das Gummituch 6 bzw. die Gummimembran 6' glatt und dicht an die Formhohlraumseite der Kerne 4, 4' angeschmiegt zu halten, sind Bohrungen 3, 3' in den Stützteilen 2, 2' vorgesehen, über welche eine Saugwirkung ausgeübt werden kann, die sich durch die porösen Kerne 4, 4' hindurch dem Gummituch 6 bzw. der Gummimembran 6' mitteilen kann.Around the rubber blanket 6 or the rubber membrane 6 'smooth and tight nestled against the mold cavity side of the cores 4, 4 ' hold, holes 3, 3 'are provided in the support parts 2, 2', through which a suction effect can be exerted, which through the porous cores 4, 4 'through the rubber blanket 6 or the rubber membrane 6 'can communicate.

Mindestens eines der Stützteile 2, 2', im gezeigten Ausführungsbeispiel das untere Stützteil 2', sowie der zugehörige Kern 4' mit aufgelegter Gummimembran 6' sind von Hohlschrauben 16,17 durchsetzt, die über eine Schlauchanordnung 18 an einen Durchlaß 19 im Stützteil 2' zum Abführen von Luft und/oder Wasser aus dem Formnohlraum dicht angeschlossen sind.At least one of the support parts 2, 2 ', in the exemplary embodiment shown the lower support part 2 'and the associated one Core 4 'with rubber membrane 6' are made of hollow screws 16.17 interspersed with a hose assembly 18 to a passage 19 in the support part 2 'for discharging Air and / or water from the mold cavity are tightly connected are.

Alternativ können auch feine Öffnungen (nicht gezeigt) im Bereich der Löcher 3,3' in den Gummimembranen 6,6' vorgesehen sein, so daß dann ein Absaugen von Luft und/oder Wasser aus dem Formhohlraum über die Löcher 3,3' ermöglicht ist.Alternatively, fine openings (not shown) in the Area of the holes 3,3 'in the rubber membranes 6,6' provided be so that then a suction of air and / or water is made possible from the mold cavity via the holes 3,3 '.

Im geschlossenen Zustand der Form gemäß Fig. 1 verbleibt ein Abstand zwischen den beiden parallelen Randleisten 8, 8', der durch einen Streifen 14 von keramischem Material beim Preßvorgang eines Formkörpers 13, wie eines Dachziegelrohlings, zumindest teilweise ausgefüllt wird.1 remains in the closed state of the mold a distance between the two parallel edge strips 8, 8 'by a strip 14 of ceramic material during the pressing process of a shaped body 13, such as a roof tile blank, is at least partially filled out.

Fig. 2 zeigt eine Trommelanordnung 20 mit fünf Unterformen mit Stützteilen 2' und einer in der obersten Lage befindlichen Oberform 2, die über eine Isolierung 21 von einem Preßstempel 22 beaufschlagt ist. Zwischen der Oberform und der Unterform ist ein Dachziegelrohling 13 dargestellt. Die Randleisten 8,8' sind ebenfalls angedeutet.2 shows a drum arrangement 20 with five sub-molds with support parts 2 'and one in the top position Upper mold 2, which has an insulation 21 from a Press ram 22 is acted upon. Between the upper form and a roof tile blank 13 is shown in the lower mold. The Edge strips 8,8 'are also indicated.

Ferner ist eine elektrische Schaltung umfassend eine Gleichspannungsquelle 24 dargestellt, welche über ein Umschaltrelais 26 einerseits mit der Randleiste 8 der Oberform und andererseits mit der Welle 28 der Trommelanordnung 20 und somit mit dem metallenen Stützteil 2'der Unterform elektrisch leitend verbunden ist.Furthermore, an electrical circuit comprising a DC voltage source 24 shown, which via a changeover relay 26 on the one hand with the edge strip 8 of the upper shape and on the other hand with the shaft 28 of the drum arrangement 20 and thus with the metal support part 2 'of the lower mold is electrically connected.

Über das Umschaltrelais 26 kann die Polung von Minuspol und Pluspol der Gleichstromquelle 24 umgeschaltet werden.The polarity of the negative pole and Positive pole of the DC power source 24 are switched.

Im Betrieb wird nach abgeschlossenem Preßvorgang über den an der oberen Randleiste 8 angebrachten Minuspol der Spannungsquelle 24 ein Stromstoß der Gleichspannungsquelle für eine vorbestimmte, zweckmäßige Zeitdauer aufgebracht, um ein Lösen der oberen Formhälfte von der Oberseite des Dachziegelrohlinges 13 zu bewirken. Dann wird die Polung umgekehrt, so daß der Minuspol über die Welle 28 und die untere Formhälfte, d.h. das Stützteil 2', die Schrauben 10' und die Randleiste 8' in entgegengesetzter Richtung über den Streifen 14 zur Randleiste 8 in die obere Formhälfte fließt. Dadurch wird auch die untere Formhälfte von dem Ziegelrohling 13 gelöst. Nun kann ohne die Gefahr eines Anhaftens von Teilen des Formkörpers 13 an der Form die obere Formhälfte abgehoben und die Trommelanordnung 20 um einen Schritt in Pfeilrichtung weitergeschaltet werden, wobei dann der fertiggestellte Formkörper ohne die Gefahr der Beschädigung auch von der unteren Formhälfte abgehoben werden kann.In operation, after the pressing process has been completed on the upper edge 8 attached negative pole of the voltage source 24 a surge of the DC voltage source for applied a predetermined, appropriate amount of time to loosening the upper mold half from the top of the roof tile blank 13 to effect. Then the polarity is reversed, so that the negative pole on the shaft 28 and the lower Mold half, i.e. the support part 2 ', the screws 10' and the edge strip 8 'in the opposite direction over the Strip 14 to the skirting 8 in the upper half of the mold flows. This will also remove the lower half of the mold Brick blank 13 solved. Now without the risk of a Adhering parts of the molded body 13 to the mold upper mold half lifted and the drum assembly 20 um be advanced one step in the direction of the arrow, then the finished molded body without the risk the damage is also lifted off the lower half of the mold can be.

Claims (9)

  1. A mould for making mouldings from plastic material, more particularly ceramic material, comprising two mould halves each comprising a light-metal or light-metal alloy support part (2, 2') and a synthetic resin core (4, 4') and each connectable to one terminal of a voltage source (24), the space (14) between the edges of the two mould halves being filled by the plastic material when the mould is closed, characterised in that on the mould cavity side each core (4, 4') is covered by an intermediate layer consisting of an elastomer such as a rubber cloth (6) or rubber membrane (6'), in that each intermediate layer (6, 6') is clamped between a mould half and a metal edge strip (8, 8') adjacent the mould cavity and electrically connected to the associated mould half, and the mould half is clamped and in that one terminal of the voltage source (24) is connectable via an edge strip (8 or 8') and the other terminal is directly connectable to the associated mould half.
  2. A mould according to claim 1, characterised in that the edge strip (8, 8') is releasably connected to the associated mould half (2, 2') by screws (10, 10').
  3. A mould according to claim 2, characterised in that the screws (10, 10') have countersunk heads (11, 11') which are countersunk into the edge strips (8, 8').
  4. A mould according to any of claims 1 to 3, characterised in that the edge strips (8, 8') are disposed in a region outside the mould cavity.
  5. A mould according to any of claims 1 to 4, characterised in that the edge strips are made of chrome-nickel steel.
  6. A mould according to any of claims 1 to 5, characterised in that the two mould halves are formed with holes (3; 3') opening towards the mould cavity for sucking the intermediate layer (6, 6') to the mould side of the core (4, 4') by means of air at negative pressure supplied through the holes.
  7. A mould according to claim 6, characterised in that the intermediate layer (6, 6') is formed in the region of the holes (3; 3') with fine openings for admitting air and water, the air and/or water being adapted to be sucked away through the holes (3; 3').
  8. A mould according to any of claims 1 to 6, characterised in that at least one of the two intermediate layers (6') is secured to the associated mould half (2, 2') by hollow screws (16, 17) through which air and water can be discharged from the mould cavity.
  9. A method of releasing plastic mouldings from a mould according to any of claims 1 to 8, characterised in that the terminals of a DC voltage source (24) are connected by a switching relay (26) alternately to one edge strip (8, 8') and to the other mould half (2', 2), a current pulse being applied in each case for an advantageous predetermined time.
EP19970105311 1997-03-27 1997-03-27 Mould for pressing articles from plastic masses Expired - Lifetime EP0868985B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP19970105311 EP0868985B1 (en) 1997-03-27 1997-03-27 Mould for pressing articles from plastic masses
DE59700058T DE59700058D1 (en) 1997-03-27 1997-03-27 Mold for pressing moldings from plastic masses
ES97105311T ES2125730T3 (en) 1997-03-27 1997-03-27 MOLD FOR PRESSING BODIES MADE OF PLASTIC MASSES.
PCT/EP1998/001736 WO1998043793A1 (en) 1997-03-27 1998-03-24 Mold for compressing shaped bodies from plastic masses
IDP980448A ID20113A (en) 1997-03-27 1998-03-27 MOLD FOR PRESCRIPTION OF PRINT OBJECTS FROM PLASTIC MATERIALS
GR990400877T GR3029789T3 (en) 1997-03-27 1999-03-23 Mould for pressing articles from plastic masses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19970105311 EP0868985B1 (en) 1997-03-27 1997-03-27 Mould for pressing articles from plastic masses

Publications (2)

Publication Number Publication Date
EP0868985A1 EP0868985A1 (en) 1998-10-07
EP0868985B1 true EP0868985B1 (en) 1998-12-23

Family

ID=8226648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970105311 Expired - Lifetime EP0868985B1 (en) 1997-03-27 1997-03-27 Mould for pressing articles from plastic masses

Country Status (5)

Country Link
EP (1) EP0868985B1 (en)
DE (1) DE59700058D1 (en)
ES (1) ES2125730T3 (en)
GR (1) GR3029789T3 (en)
ID (1) ID20113A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19847087C1 (en) * 1998-10-13 2000-01-05 Rieter Werke Haendle Method for making metal press molds for roof tiles having both durability and excellent release characteristics
EP3486056A1 (en) * 2017-11-16 2019-05-22 HÄNDLE GmbH Maschinen und Anlagenbau Roofing tile press, upper mould as well as an intermediate plate
CN112895103B (en) * 2021-01-23 2022-06-14 邵阳市通恒建材有限公司 Method for casting and molding concrete perforated brick

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR536091A (en) * 1921-09-27 1922-04-26 Deburring molds for flat tiles
NL273172A (en) * 1961-01-12
US4473526A (en) * 1980-01-23 1984-09-25 Eugen Buhler Method of manufacturing dry-pressed molded articles
IT1192004B (en) * 1986-06-18 1988-03-31 Fonderie Officine Meccaniche B FASTENING SYSTEM OF ELASTOMERIC MEMBRANE TO THE UPPER MOLD FOR CERAMIC PRODUCTS
DE8618713U1 (en) * 1986-07-12 1986-09-18 Ottensteiner Kunststoff GmbH, 4422 Ahaus Press mold for roof tiles
FR2674172B1 (en) * 1991-03-21 1993-06-18 Ind Regionale Batiment PRESSING MOLD FOR PRODUCING ARTICLES OBTAINED FROM A MOLDABLE MATERIAL IN THE FORM OF WET PULP.

Also Published As

Publication number Publication date
ES2125730T3 (en) 1999-03-01
GR3029789T3 (en) 1999-06-30
EP0868985A1 (en) 1998-10-07
ID20113A (en) 1998-10-01
DE59700058D1 (en) 1999-02-04

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