EP0443053B1 - 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
EP0443053B1
EP0443053B1 EP90103198A EP90103198A EP0443053B1 EP 0443053 B1 EP0443053 B1 EP 0443053B1 EP 90103198 A EP90103198 A EP 90103198A EP 90103198 A EP90103198 A EP 90103198A EP 0443053 B1 EP0443053 B1 EP 0443053B1
Authority
EP
European Patent Office
Prior art keywords
pressing
mixture
hot gases
press
fumes
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
EP90103198A
Other languages
German (de)
French (fr)
Other versions
EP0443053A1 (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 EP90103198A priority Critical patent/EP0443053B1/en
Priority to ES90103198T priority patent/ES2045591T3/en
Priority to DK90103198.9T priority patent/DK0443053T3/en
Priority to DE90103198T priority patent/DE59003016D1/en
Priority to AT90103198T priority patent/ATE95464T1/en
Application filed by Werzalit AG and Co KG filed Critical Werzalit AG and Co KG
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 Press 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 obviously promoted by the fact that the chip or fiber components of the molding compound are deposited 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 filling space 2 is filled with the mixture.
  • the cover 4 is closed and a force is exerted in the vertical direction on the press tool upper part 3 with cover 4.
  • hot gases or vapors are passed through the manifold 7 and the feed channels 6 into the filled mixture.
  • 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.
  • a further possibility is to provide degassing channels in the pressing tool lower part 1 and / or in the cover 4, through which the gases to be discharged can escape, not shown.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Moulding By Coating Moulds (AREA)
  • Reinforced Plastic Materials (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

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 Press 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 obviously promoted by the fact that the chip or fiber components of the molding compound are deposited 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 producing 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 :The method according to the invention now proceeds in the following way:

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.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 manifold 7 and the feed 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. A further possibility is to provide degassing channels in the pressing tool lower part 1 and / or in the cover 4, through which the gases to be discharged can escape, not shown.

Claims (5)

  1. A method of producing shaped parts compressed from a non-flowable mixture consisting of chips or shavings and/or fibrous materials mixed with heat-hardenable binding agents, with the mixture being subjected to the finish pressing in a power press comprising a pressing mould closed on all sides, and hardened in the course of this, and with part of the heat energy required for the hardening being produced by hot gases or fumes introduced into the mixture during the pressing procedure,
    characterized in that said hot gases or fumes are introduced into said mixture as contained inside said pressing mould, in a direction extending essentially rectangularly in relation to the pressing direction.
  2. A device for carrying out the method as claimed in claim 1,
    characterized in that in the walls of said power press (3, 11) as extending parallel in relation to said pressing direction, there is arranged a plurality of feed channels (6) opening out into at least one collecting line (7) connected to a reservoir for hot gases or fumes.
  3. A device as claimed in claim 2,
    characterized in that said feed channels (6) are arranged within the area of motion of the movable press tool part (3, 11) of said power press.
  4. A device as claimed in claims 1 to 3,
    characterized in that reversible valves are provided for in said feed channels (6).
  5. A device as claimed in claims 1 to 3,
    characterized in that degassing channels are provided for in said lower press tool part (1) and/or in said lid member (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
ES90103198T ES2045591T3 (en) 1990-02-20 1990-02-20 PROCEDURE AND DEVICE FOR THE MANUFACTURE OF MOLDED PARTS.
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.
AT90103198T ATE95464T1 (en) 1990-02-20 1990-02-20 METHOD AND DEVICE FOR THE MANUFACTURE OF MOLDED PARTS.
EP90103198A EP0443053B1 (en) 1990-02-20 1990-02-20 Method and device for the production of shaped 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 EP0443053A1 (en) 1991-08-28
EP0443053B1 true 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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Also Published As

Publication number Publication date
EP0443053A1 (en) 1991-08-28
JPH03248814A (en) 1991-11-06
ATE95464T1 (en) 1993-10-15
US5078938A (en) 1992-01-07
DK0443053T3 (en) 1993-11-22
CA2036584C (en) 1995-02-07
CA2036584A1 (en) 1991-08-21
JPH0622818B2 (en) 1994-03-30
ES2045591T3 (en) 1994-01-16
DE59003016D1 (en) 1993-11-11

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