EP0443053A1 - Method and device for the production of shaped parts - Google Patents

Method and device for the production of shaped parts Download PDF

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Publication number
EP0443053A1
EP0443053A1 EP90103198A EP90103198A EP0443053A1 EP 0443053 A1 EP0443053 A1 EP 0443053A1 EP 90103198 A EP90103198 A EP 90103198A EP 90103198 A EP90103198 A EP 90103198A EP 0443053 A1 EP0443053 A1 EP 0443053A1
Authority
EP
European Patent Office
Prior art keywords
mixture
press
pressing
hot gases
vapors
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.)
Granted
Application number
EP90103198A
Other languages
German (de)
French (fr)
Other versions
EP0443053B1 (en
Inventor
Edmund Munk
Helmuth Huber
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.)
Werzalit AG and Co KG
Original Assignee
Werzalit AG and Co KG
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 to ES90103198T priority Critical patent/ES2045591T3/en
Application filed by Werzalit AG and Co KG filed Critical Werzalit AG and Co KG
Priority to DK90103198.9T priority patent/DK0443053T3/en
Priority to DE90103198T priority patent/DE59003016D1/en
Priority to EP90103198A priority patent/EP0443053B1/en
Priority to AT90103198T priority patent/ATE95464T1/en
Priority to JP2247649A priority patent/JPH0622818B2/en
Priority to US07/585,820 priority patent/US5078938A/en
Priority to CA002036584A priority patent/CA2036584C/en
Publication of EP0443053A1 publication Critical patent/EP0443053A1/en
Application granted granted Critical
Publication of EP0443053B1 publication Critical patent/EP0443053B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/086—Presses with means for extracting or introducing gases or liquids in the mat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N5/00—Manufacture of non-flat articles

Definitions

  • the application relates to a process for the production of moldings from a non-flowable mixture of chip and / or fiber materials and thermosetting binders, in which the mixture is pressed and cured in a press with a mold closed on all sides, and in which a part of the Curing heat energy required is applied by hot gases or vapors introduced into the mixture during pressing.
  • Such a method is known (DE-C-1 284 624).
  • the known method is intended to prevent particles from being torn out of the pre-pressed profile body, which then clog the channels during hot pressing, through which the vapors and gases formed in the molding compound are discharged or hot gases are fed into the interior of the mold.
  • Problems have been proposed for the known method of pressing depressions that are distributed over the surface of the pre-compact at least on one of its sides during the pre-pressing.
  • the present invention is concerned with a process for the production of molded parts from a non-flowable mixture, in which the profile body is pressed out of the mixture in a hot pressing process, namely a measure for the rapid and uniform introduction of the gases or vapors into the closed one Mold are specified so that the pressing and curing time is reduced to a minimum.
  • the hot gases and vapors can be introduced into the mixture in the mold in the shortest possible time and can be distributed evenly there. This not only leads to an even distribution of the heat in the molding compound, but also to rapid heating of the molding compound. This process is apparently promoted by the fact that the chip or fiber components of the molding compound deposit in the preform in such a way that the larger number of chips or fibers is at right angles to the pressing direction.
  • the press shown in FIG. 1 has a fixed pressing tool lower part 1.
  • the frame-like pressing tool upper part 3 comprising the filling space 2 is guided vertically thereon. It can be closed with the lid 4 and - as indicated by the arrows 5 - vertically displaceable.
  • the supply channels 6 for the hot gases and vapors are arranged horizontally, one end of which leads into the filling space 2 and the other end of which leads to a collecting line 7 leading to a reservoir (not shown) for hot gases or vapors.
  • the method according to the invention now proceeds in the following way: After opening the cover 4, the filling space 2 is filled with the mixture. Then the cover 4 is closed and a force is exerted in the vertical direction on the press tool upper part 3 with cover 4. At the same time, hot gases or vapors are passed through the collecting line 7 and the supply channels 6 into the filled mixture. In this way, the molded part 8 is pressed and cured from the mixture, if necessary with additional heating of the lower pressing part 1, upper pressing part 3 and cover 4.
  • Fig. 2 shows the press after completion of the pressing process.
  • the molded part 8 can be ejected after opening the cover 4. From Fig. 2 it is clear that the supply channels 6 are arranged in the pressing tool upper part 3 only in the areas in which the pressing tool upper part 3 is moved past the pressing tool lower part 1.
  • Fig. 3 shows an apparatus for producing pallets pressed from the mixture, in which the method according to the invention is used to accelerate the pressing and hardening of the strong edge.
  • the pallet consists in a manner known per se from a largely flat plate 9, which has several Pot-shaped feet 10 is provided.
  • the press consists of a fixed pressing tool lower part 11 and a movable pressing tool upper part 12. In the area of the edge 13 of the pallet, the pressing tool lower part 11 is provided with the feed channels 6, which open into the collecting line 7 at one end.
  • the device according to FIG. 4 differs from the device according to FIGS. 1 and 2 in that the pressing tool upper part 3 still has a central part 14, which also has feed channels 6 and a collecting line 7.
  • the gases still in the molded part after the hot pressing are quickly removed from the molded part or the press.
  • One way to achieve this is to arrange reversible valves - not shown - in the feed channels. These valves are to be controlled in such a way that the path for the gases to be removed is opened after the mold is closed.
  • Another possibility is to provide degassing channels in the press tool lower part 1 and / or in the cover 4, through which the gases to be discharged can escape, not shown.

Abstract

Concerned are a method and device for the production of shaped parts from a non-flowable mixture of chip or fibre materials and heat-curable binders. In the case of this method, part of the heat energy required for curing is provided by hot gases or vapours, which are introduced into the mixture during pressing. The hot gases or vapours are to be introduced into the mixture at right angles to the direction of pressing.

Description

Die Anmeldung betrifft ein Verfahren zur Herstellung von Formteilen aus einem nicht fließfähigen Gemisch von Span- und/oder Faserwerkstoffen und wärmehärtbaren Bindemitteln, bei dem das Gemisch in einer Presse mit einer allseitig geschlossenen Preßform fertiggepreßt und dabei ausgehärtet wird,und bei dem ein Teil der zum Aushärten benötigten Wärmeenergie durch während des Pressens in das Gemisch eingeführte heiße Gase oder Dämpfe aufgebracht wird.The application relates to a process for the production of moldings from a non-flowable mixture of chip and / or fiber materials and thermosetting binders, in which the mixture is pressed and cured in a press with a mold closed on all sides, and in which a part of the Curing heat energy required is applied by hot gases or vapors introduced into the mixture during pressing.

Ein solches Verfahren ist bekannt ( DE - C - 1 284 624 ). Beim bekannten Verfahren soll verhindert werden, daß aus dem vorgepreßten Profilkörper Teilchen herausgerissen werden, welche dann beim Heißpressen die Kanäle verstopfen, durch welche die in der Preßmasse entstehenden Dämpfe und Gase abgeführt oder heiße Gase in das Innere der Preßform zugeführt werden.Zur Lösung dieses technischen Problems ist für das bekannte Verfahren vorgeschlagen worden, in den Vorpreßling beim Vorpressen wenigstens auf einer seiner Seiten über die Oberfläche verteilte Vertiefungen einzupressen.Such a method is known (DE-C-1 284 624). The known method is intended to prevent particles from being torn out of the pre-pressed profile body, which then clog the channels during hot pressing, through which the vapors and gases formed in the molding compound are discharged or hot gases are fed into the interior of the mold. To solve this technical problem Problems have been proposed for the known method of pressing depressions that are distributed over the surface of the pre-compact at least on one of its sides during the pre-pressing.

Die vorliegende Erfindung befaßt sich demgegenüber mit einem Verfahren zur Herstellung von Formteilen aus einem nicht fließfähigen Gemisch, bei dem der Profilkörper in einem Heißpreßvorgang aus dem Gemisch gepreßt wird, und zwar soll eine Maßnahme für das rasche und gleichmäßige Einführen der Gase oder Dämpfe in die geschlossene Preßform angegeben werden, so daß die Preß- und Aushärtezeit auf ein Minimum herabgesetzt wird.In contrast, the present invention is concerned with a process for the production of molded parts from a non-flowable mixture, in which the profile body is pressed out of the mixture in a hot pressing process, namely a measure for the rapid and uniform introduction of the gases or vapors into the closed one Mold are specified so that the pressing and curing time is reduced to a minimum.

Dieses technische Problem ist erfindungsgemäß dadurch gelöst, daß die heißen Gase oder Dämpfe in das in der Preßform befindliche Gemisch in einer Richtung eingebracht wird, welche im wesentlichen rechtwinklig zur Preßrichtung ist.This technical problem is solved according to the invention in that the hot gases or vapors are introduced into the mixture in the press mold in a direction which is essentially perpendicular to the press direction.

In der Praxis ist festgestellt worden, daß die heißen Gase und Dämpfe auf diese Weise in kürzester Zeit in das in der Preßform befindliche Gemisch eingebracht werden können und sich dort gleichmäßig verteilen. Das führt nicht nur zu einer gleichmäßigen Verteilung der Hitze in der Preßmasse, sondern auch zu einer schnellen Erhitzung der Preßmasse. Dieser Vorgang wird offenbar dadurch gefördert, daß sich die Span- oder Faserbestandteile der Preßmasse beim Einfüllen in die Preform derart ablagern, daß die größere Anzahl der Späne oder Fasern im rechten Winkel zur Preßrichtung liegt.In practice it has been found that the hot gases and vapors can be introduced into the mixture in the mold in the shortest possible time and can be distributed evenly there. This not only leads to an even distribution of the heat in the molding compound, but also to rapid heating of the molding compound. This process is apparently promoted by the fact that the chip or fiber components of the molding compound deposit in the preform in such a way that the larger number of chips or fibers is at right angles to the pressing direction.

In den Figuren 1 bis 4 sind Ausführungsbeispiele für Vorrichtungen zur Durchführung der erfindungsgemäßen Verfahrens gezeigt. Es zeigen :

Fig. 1
eine Presse zur Herstellung von plattenförmigen Formteilen in Füllstellung,
Fig. 2
die Presse gemäß Fig. 1 nach dem Pressen des Formteils,
Fig. 3
eine Presse zur Herstellung von Paletten und
Fig. 4
eine Presse zur Herstellung von Ronden.
1 to 4 show exemplary embodiments of devices for carrying out the method according to the invention. Show it :
Fig. 1
a press for the production of plate-shaped molded parts in the filling position,
Fig. 2
1 after pressing the molded part,
Fig. 3
a press for the production of pallets and
Fig. 4
a press for the production of round blanks.

Die in Fig. 1 gezeigte Presse besitzt ein feststehendes Preßwerkzeugunterteil 1. An diesem ist das den Füllraum 2 umfassende, rahmenartige Preßwerkzeugoberteil 3 vertikal geführt. Es ist mit dem Deckel 4 verschließbar und - wie durch die Pfeile 5 angedeutet - vertikal verschiebbar. In den Wänden des Preßwerkzeugoberteils 3 sind horizontal die Zuführungskanäle 6 für die heißen Gase und Dämpfe angeordnet, deren ein Ende in den Füllraum 2 und deren anderes Ende in einer zu einem - nicht gezeigten - Reservoir für heiße Gase oder Dämpfe führenden Sammelleitung 7 mündet.The press shown in FIG. 1 has a fixed pressing tool lower part 1. The frame-like pressing tool upper part 3 comprising the filling space 2 is guided vertically thereon. It can be closed with the lid 4 and - as indicated by the arrows 5 - vertically displaceable. In the walls of the pressing tool upper part 3, the supply channels 6 for the hot gases and vapors are arranged horizontally, one end of which leads into the filling space 2 and the other end of which leads to a collecting line 7 leading to a reservoir (not shown) for hot gases or vapors.

Das erfindungsgemäße Verfahren läuft nun in folgender Weise ab :
Nach Öffnen des Deckels 4 wird der Füllraum 2 mit dem Gemisch gefüllt. Dann wird der Deckel 4 geschlossen und auf das Preßwerkzeugoberteil 3 mit Deckel 4 eine Kraft in vertikaler Richtung ausgeübt. Gleichzeitig werden durch die Sammelleitung 7 und die Zuführungskanäle 6 heiße Gase oder Dämpfe in das eingefüllte Gemisch geleitet. Auf diese Weise wird - ggf. bei zusätzlicher Erhitzung von Preßwerkzeugunterteil 1, Preßwerkzeugoberteil 3 und Deckel 4 - aus dem Gemisch das Formteil 8 gepreßt und ausgehärtet.The method according to the invention now proceeds in the following way:
After opening the cover 4, the filling space 2 is filled with the mixture. Then the cover 4 is closed and a force is exerted in the vertical direction on the press tool upper part 3 with cover 4. At the same time, hot gases or vapors are passed through the collecting line 7 and the supply channels 6 into the filled mixture. In this way, the molded part 8 is pressed and cured from the mixture, if necessary with additional heating of the lower pressing part 1, upper pressing part 3 and cover 4.

Fig. 2 zeigt die Presse nach Beendigung des Preßvorganges. Das Formteil 8 kann nach Öffnen des Deckels 4 ausgestoßen werden. Aus Fig. 2 wird deutlich, daß die Zuführungskanäle 6 im Preßwerkzeugoberteil 3 nur in den Bereichen angeordnet sind, in dem das Preßwerkzeugoberteil 3 an dem Preßwerkzeugunterteil 1 vorbeibewegt wird.Fig. 2 shows the press after completion of the pressing process. The molded part 8 can be ejected after opening the cover 4. From Fig. 2 it is clear that the supply channels 6 are arranged in the pressing tool upper part 3 only in the areas in which the pressing tool upper part 3 is moved past the pressing tool lower part 1.

Fig. 3 zeigt eine Vorrichtung zur Herstellung von aus dem Gemisch gepreßten Paletten, bei der das erfindungsgemäße Verfahren dazu verwendet wird, um das Pressen und Aushärten des starken Randes zu beschleunigen. Die Palette besteht in an sich bekannter Weise aus einer weitestgehend ebenen Platte 9, welche mit mehreren topfförmigen Füßen 10 versehen ist. Die Presse besteht aus einem feststehenden Preßwerkzeugunterteil 11 und einem beweglichen Preßwerkzeugoberteil 12. Im Bereich des Randes 13 der Palette ist das Preßwerkzeugunterteil 11 mit den Zuführungskanälen 6 versehen, welche an einem Ende in der Sammelleitung 7 münden.Fig. 3 shows an apparatus for producing pallets pressed from the mixture, in which the method according to the invention is used to accelerate the pressing and hardening of the strong edge. The pallet consists in a manner known per se from a largely flat plate 9, which has several Pot-shaped feet 10 is provided. The press consists of a fixed pressing tool lower part 11 and a movable pressing tool upper part 12. In the area of the edge 13 of the pallet, the pressing tool lower part 11 is provided with the feed channels 6, which open into the collecting line 7 at one end.

Die Vorrichtung gemäß Fig. 4 unterscheidet sich von der Vorrichtung gemäß den Figuren 1 und 2 dadurch, daß das Preßwerkzeugoberteil 3 noch ein zentrales Teil 14 besitzt, welches ebenfalls Zuführungskanäle 6 und eine Sammelleitung 7 besitzt.The device according to FIG. 4 differs from the device according to FIGS. 1 and 2 in that the pressing tool upper part 3 still has a central part 14, which also has feed channels 6 and a collecting line 7.

Es ist zweckmäßig, daß die nach dem Heißpressen noch im Formteil befindlichen Gase rasch aus dem Formteil bzw der Presse entfernt werden. Eine Möglichkeit, um das zu verwirklichen , besteht darin, in den Zuführungskanälen - nicht gezeigte - umsteuerbare Ventile anzuordnen. Diese Ventile sollen in der Weise gesteuert werden, daß nach Schließen der Preßform der Weg für die abzuführenden Gase geöffnet ist. Eine weitere Möglichkeit besteht darin, im Preßwerkzeugunterteil 1 und/oder im Deckel 4 - nicht gezeigte - Entgasungskanäle vorzusehen, durch welche die abzuführenden Gase entweichen können.It is expedient that the gases still in the molded part after the hot pressing are quickly removed from the molded part or the press. One way to achieve this is to arrange reversible valves - not shown - in the feed channels. These valves are to be controlled in such a way that the path for the gases to be removed is opened after the mold is closed. Another possibility is to provide degassing channels in the press tool lower part 1 and / or in the cover 4, through which the gases to be discharged can escape, not shown.

Claims (5)

Verfahren zur Herstellung von Formteilen aus einem nicht fließfähigen Gemisch von Span- und/oder Faserwerkstoffen und wärmehärtbaren Bindemitteln, bei dem das Gemisch in einer Presse mit allseitig geschlossener Preßform fertiggepreßt und dabei ausgehärtet wird und bei dem ein Teil der zum Aushärten benötigten Wärmeenergie durch während des Pressens in das Gemisch eingeführte heiße Gase oder Dämpfe aufgebracht wird,
dadurch gekennzeichnet, daß die heißen Gase oder Dämpfe in das in der Preßform befindliche Gemisch in einer Richtung eingebracht wird, welche im wesentlichen rechtwinklig zur Preßrichtung ist.A process for the production of molded parts from a non-flowable mixture of chip and / or fiber materials and thermosetting binders, in which the mixture is pressed and cured in a press with a mold closed on all sides and in which part of the heat energy required for curing is obtained during the Pressing hot gases or vapors introduced into the mixture is applied,
characterized in that the hot gases or vapors are introduced into the mixture in the compression mold in a direction which is substantially perpendicular to the compression direction. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1,
dadurch gekennzeichnet,daß in den parallel zur Preßrichtung liegenden Wänden der Presse (3,11) eine Mehrzahl von Zuführungskanälen (6)angeordnet ist, welche in wenigstens einer mit einem Reservoir für heiße Gase oder Dämpfe verbundenen Sammelleitung ( 7 ) münden.Device for carrying out the method according to claim 1,
characterized in that a plurality of feed channels (6) are arranged in the walls of the press (3, 11) which are parallel to the pressing direction and which open into at least one collecting line (7) connected to a reservoir for hot gases or vapors. Vorrichtung nach Patentanspruch 2,
dadurch gekennzeichnet, daß die Zuführungskanäle (6) in dem Bewegungsbereich des beweglichen Preßwerkzeugteils ( 3,11) der Presse angeordnet sind.Device according to claim 2,
characterized in that the feed channels (6) are arranged in the range of motion of the movable press tool part (3, 11) of the press. Vorrichtung nach den Ansprüchen 1 bis 3,
dadurch gekennzeichnet, daß in den Zuführungskanälen (6) umsteuerbare Ventile angeordnet sind.Device according to claims 1 to 3,
characterized in that reversible valves are arranged in the feed channels (6). Vorrichtung nach den Ansprüchen 1 bis 3,
dadurch gekennzeichnet, daß im Preßwerkzeugunterteil (1) und/oder im Deckel (4) Entgasungskanaäle vorhanden sind.Device according to claims 1 to 3,
characterized in that degassing channels are present in the lower press part (1) and / or in the cover (4).
EP90103198A 1990-02-20 1990-02-20 Method and device for the production of shaped parts Expired - Lifetime EP0443053B1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DK90103198.9T DK0443053T3 (en) 1990-02-20 1990-02-20 Method and apparatus for making mold parts
DE90103198T DE59003016D1 (en) 1990-02-20 1990-02-20 Method and device for producing molded parts.
EP90103198A EP0443053B1 (en) 1990-02-20 1990-02-20 Method and device for the production of shaped parts
AT90103198T ATE95464T1 (en) 1990-02-20 1990-02-20 METHOD AND DEVICE FOR THE MANUFACTURE OF MOLDED PARTS.
ES90103198T ES2045591T3 (en) 1990-02-20 1990-02-20 PROCEDURE AND DEVICE FOR THE MANUFACTURE OF MOLDED PARTS.
JP2247649A JPH0622818B2 (en) 1990-02-20 1990-09-19 Method and apparatus for manufacturing molded parts
US07/585,820 US5078938A (en) 1990-02-20 1990-09-20 Method and apparatus for making a molded article from a nonflowable mixture of chip and/or fiber material and a thermally hardenable binder
CA002036584A CA2036584C (en) 1990-02-20 1991-02-19 Method and apparatus for making a molded article from a non-flowable mixture of chip and/or fiber material and a thermally hardenable binder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90103198A EP0443053B1 (en) 1990-02-20 1990-02-20 Method and device for the production of shaped parts

Publications (2)

Publication Number Publication Date
EP0443053A1 true EP0443053A1 (en) 1991-08-28
EP0443053B1 EP0443053B1 (en) 1993-10-06

Family

ID=8203665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103198A Expired - Lifetime EP0443053B1 (en) 1990-02-20 1990-02-20 Method and device for the production of shaped parts

Country Status (8)

Country Link
US (1) US5078938A (en)
EP (1) EP0443053B1 (en)
JP (1) JPH0622818B2 (en)
AT (1) ATE95464T1 (en)
CA (1) CA2036584C (en)
DE (1) DE59003016D1 (en)
DK (1) DK0443053T3 (en)
ES (1) ES2045591T3 (en)

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DE4430528C2 (en) * 1994-08-27 2003-09-18 Werzalit Ag & Co Method and device for producing molded parts
EP0908281A1 (en) * 1997-10-10 1999-04-14 Werzalit Ag + Co. Method and apparatus for manufacturing moulded articles
US5972262A (en) * 1997-10-10 1999-10-26 Werzalit Ag + Co Method of and device for producing shaped parts
EP0956936A1 (en) * 1998-05-15 1999-11-17 Werzalit Ag + Co. Multipurpose press for manufacturing moulded articles
US6238199B1 (en) 1998-05-15 2001-05-29 Werzalit Ag + Co. Multi-purpose press for producing formed parts
DE19825172C2 (en) * 1998-06-05 2003-02-06 Karl-Heinz Schallenmueller Device for the production of molded parts

Also Published As

Publication number Publication date
JPH03248814A (en) 1991-11-06
CA2036584A1 (en) 1991-08-21
DE59003016D1 (en) 1993-11-11
ES2045591T3 (en) 1994-01-16
US5078938A (en) 1992-01-07
EP0443053B1 (en) 1993-10-06
CA2036584C (en) 1995-02-07
ATE95464T1 (en) 1993-10-15
JPH0622818B2 (en) 1994-03-30
DK0443053T3 (en) 1993-11-22

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