EP0415184B1 - Verfahren und Einrichtung zur kontinuierlichen Herstellung von Formkörpern aus anorganisch gebundenen Werkstoffen - Google Patents

Verfahren und Einrichtung zur kontinuierlichen Herstellung von Formkörpern aus anorganisch gebundenen Werkstoffen Download PDF

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Publication number
EP0415184B1
EP0415184B1 EP90115654A EP90115654A EP0415184B1 EP 0415184 B1 EP0415184 B1 EP 0415184B1 EP 90115654 A EP90115654 A EP 90115654A EP 90115654 A EP90115654 A EP 90115654A EP 0415184 B1 EP0415184 B1 EP 0415184B1
Authority
EP
European Patent Office
Prior art keywords
pressure
strand
density
thickness
compression unit
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
EP90115654A
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German (de)
English (en)
French (fr)
Other versions
EP0415184A3 (en
EP0415184A2 (de
Inventor
Karsten Dr.-Dipl.-Holzw. Lempfer
Volker Dipl.-Ing. Thole
Thomas Dipl.-Holzw. Hilbert
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority to AT90115654T priority Critical patent/ATE91660T1/de
Publication of EP0415184A2 publication Critical patent/EP0415184A2/de
Publication of EP0415184A3 publication Critical patent/EP0415184A3/de
Application granted granted Critical
Publication of EP0415184B1 publication Critical patent/EP0415184B1/de
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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • B28B1/526—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement by delivering the materials on a conveyor of the endless-belt type
    • 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
    • B28B5/02—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 on conveyors of the endless-belt or chain type
    • B28B5/026—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 on conveyors of the endless-belt or chain type the shaped articles being of indefinite length
    • B28B5/027—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 on conveyors of the endless-belt or chain type the shaped articles being of indefinite length the moulding surfaces being of the indefinite length type, e.g. belts, and being continuously fed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses

Definitions

  • the invention relates to a method and device for the continuous production of moldings from inorganically bound materials according to the preamble of claim 1 and claim 2.
  • Such a method is known from DE-OS 34 41 839.
  • the continuous production of shaped bodies from inorganic materials described therein presupposes the presence of a high-pressure compression unit and a calibration device immediately following this.
  • the calibration device connects to the high-pressure compression unit without a transition.
  • This measure requires a special construction. It is not possible to use available continuous high-pressure presses for overcompression, since the dimensions of the available high-pressure presses do not allow the strand of material to be passed directly into a calibration device. This is e.g. due to the required return of the pole carpet or roller chains (Siempelkamp-Contiroll, Wegrs-Contipress), for which sufficient space is required.
  • the method known from DE-OS 34 41 839 is therefore not suitable for available continuous high-pressure presses and always requires a special device. This is disadvantageous because it involves high costs.
  • the object of the invention is to provide a method and a device in which the calibration device can be used without active pressure application, even in the case of an unpressurized transition zone between the high compression and the calibration device.
  • a recompression unit is immediately connected upstream of the calibration device, in which the strand of material springing back in the transition zone is compressed again to its target thickness / target density or below / above it.
  • a renewed active pressure action to re-compress the strand of material at the beginning of the calibration phase makes it possible to increase the desired relaxation of the restoring forces within the strand of material. For this re-compression of the strand of material, a considerably lower compression pressure is required than in the high-pressure compression unit.
  • Arranging the recompression unit directly in front of the calibration device ensures that the relaxation behavior of the previously highly compacted strand of material is used, but the effort required to produce high preform densities would have to be operated so that the strand of material does not spring back over the desired thickness during the transfer phase. If the strand of material is compressed again above its target density or below its target thickness during the recompaction, its restoring forces are further reduced. As a result, the calibration pressure to be applied in the calibration device without active pressure action is lower than without a second over-compression. In accordance with the relaxation behavior of the material strand, the duration of pressure exposure within the high-pressure device and thus its length and costs can be further reduced by a second over-compression without the required calibration pressure increasing significantly.
  • the application of a line pressure is also sufficient in the high pressure zone. If the advantage of an unpressurized transfer zone is used without the need for recompaction, the strand of material would have to be significantly over-compressed. This is not possible using available continuous high-pressure presses, or would be impossible per se with high nominal bulk densities of the material, because the molding cannot be compressed beyond its pure density.
  • the recompression unit applies line pressure to the strand of material.
  • a line pressure e.g. by means of rollers of relatively large diameter, is particularly easy to implement, and the costs of such a printing device are significantly lower compared to a device which applies surface pressure.
  • the compression pressure of the recompression unit is considerably lower than that of the high-pressure compression unit.
  • Another measure which is advantageous according to the invention is that by separating the high-pressure compression unit and the recompression unit with the calibration device, each of these two devices can have different speeds. It is important that the calibration device with the recompression unit can have a higher speed than the high-pressure compression unit at the beginning of the pressing process.
  • the high pressure compression of the strand of material lengthens it. If the high-pressure compression unit is arranged directly upstream of the calibration device, both presses run at the same speed and there is a risk of the strand of material being warped in the calibration device. If the units work independently of one another, the individual press speeds can easily be adapted to the change in the length of the material strand.
  • the device shown schematically in FIG. 1 has a spreading unit 1, a high-pressure compression press 2, a recompression unit 3 and a calibration press 4.
  • the pressure-free zone 5 lies between the high-pressure compression press 2 and the recompression unit 3.
  • the recompression unit 3 has two rollers 6, which act on the molding with a line pressure. The manufacturing process is described below using an example:
  • the fleece scattered on the conveyor belts from the spreading unit 1 first passes through the high-pressure press 2. This presses the material strand with a surface pressure.
  • the molding remains in the high-pressure press 2 for about 10 seconds and is compressed to about 14.6 mm at a predetermined target thickness of 16 mm. This high pressure compression takes place with a specific pressure of 5 N / mm2. Then, after leaving the high-pressure press 2, the molding passes through the pressure-free zone 5.
  • the pressure-free time is approximately 25 seconds and the length of the pressure-free zone 5 is approximately 5 m.
  • the springback of the molding starts immediately after leaving the high-pressure press 2. At the end of the pressure-free zone 5 and when it enters the recompression unit 3, the molded article springs back to approximately 21.5 mm.
  • a line pressure is applied to the molding in the recompression unit 3, which pressure is applied by the rollers 6.
  • a pressure of about 0.5 N / mm2 is required to achieve the compaction to the target thickness (16mm).
  • the molding recompressed to its target thickness now runs into the calibration press 4. In the example described above, the molding was not over-compressed in the second pressing section (re-compression unit), but was re-compressed to its target thickness of 16 mm.
  • Fig. 2 the time course of the pressure to be applied in the device is shown schematically.
  • a comparison of curves 1 and 2 shows that in the case of over-compression of the molding in high-pressure compression unit 2, the pressure to be applied by recompression unit 3 is about half the pressure without over-compression. This means that the restoring forces in the molding can be reduced by about 50% due to the over-compression.
  • the calibration pressure to be applied in the calibration device 4 without the action of pressure is also reduced to about half compared to the example without over-compression (curve 2).
  • curve 3 the pressure curve is schematically shown when the material strand is subjected to a line pressure in the high-pressure compression unit 2 and an over-compression of the material strand in the re-compression unit 3 also by means of line pressure.
  • the corresponding course of the molding thickness is shown schematically in FIG. 3, curve 3.
  • Fig. 4 shows the position of the chips / fibers in the molding in various stages of the manufacturing process.
  • the chips are in a disordered state (I).
  • the high-pressure compression unit 1 they are ordered by the compression of the material and brought into an essentially parallel position to the plate plane (II).
  • the molding relaxes and the chips assume a partially ordered position (III). Due to the recompression 3, the chips are finally brought into their position parallel to the plate plane (IV), and this position is then fixed in the subsequent calibration press 4 (V).
  • This position of the chips (over the entire cross-section of the plate) enables the plates produced in this way to have maximum bending strength.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)
  • Forging (AREA)
EP90115654A 1989-08-30 1990-08-16 Verfahren und Einrichtung zur kontinuierlichen Herstellung von Formkörpern aus anorganisch gebundenen Werkstoffen Expired - Lifetime EP0415184B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90115654T ATE91660T1 (de) 1989-08-30 1990-08-16 Verfahren und einrichtung zur kontinuierlichen herstellung von formkoerpern aus anorganisch gebundenen werkstoffen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3928626A DE3928626C1 (ko) 1989-08-30 1989-08-30
DE3928626 1989-08-30

Publications (3)

Publication Number Publication Date
EP0415184A2 EP0415184A2 (de) 1991-03-06
EP0415184A3 EP0415184A3 (en) 1991-07-31
EP0415184B1 true EP0415184B1 (de) 1993-07-21

Family

ID=6388152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90115654A Expired - Lifetime EP0415184B1 (de) 1989-08-30 1990-08-16 Verfahren und Einrichtung zur kontinuierlichen Herstellung von Formkörpern aus anorganisch gebundenen Werkstoffen

Country Status (5)

Country Link
US (1) US5135693A (ko)
EP (1) EP0415184B1 (ko)
AT (1) ATE91660T1 (ko)
CA (1) CA2023947C (ko)
DE (2) DE3928626C1 (ko)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4025797C2 (de) * 1990-08-15 1994-10-06 Babcock Bsh Ag Verfahren zur Herstellung von plattenförmigen Körpern aus einer Mischung von Gips und Faserstoffen sowie Anlage zur Durchführung dieses Verfahrens
DE4129466A1 (de) * 1991-09-05 1993-03-11 Bold Joerg Verfahren zur herstellung von gipsfaserplatten nach einem halbtrockenverfahren
DE4239033A1 (ko) * 1992-03-19 1993-09-23 Fraunhofer Ges Forschung
ITRE20020035A1 (it) * 2002-04-24 2003-10-24 Sacmi Metodo ed impianto per la formatura di lastre o piastrelle ceramiche

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2303087A (en) * 1938-12-24 1942-11-24 Paper Patents Co Apparatus for compressing creped wadding
US2909804A (en) * 1955-09-16 1959-10-27 Perry G Means Continuous hot pressing machine for the manufacture of compressed boards
US3521552A (en) * 1968-07-29 1970-07-21 Hans John Knapp Endless caul belt continuous press
DE2130932A1 (de) * 1971-06-22 1973-05-30 Baehre & Greten Vorrichtung zum kontinuierlichen herstellen von spanplatten
DE2247990A1 (de) * 1972-09-29 1974-04-18 Baehre & Greten Vorrichtung zum kontinuierlichen herstellen von spanplatten
DE2722356C2 (de) * 1977-05-17 1982-07-29 Bison-Werke Bähre & Greten GmbH & Co KG, 3257 Springe Verfahren und Vorrichtung zum kontinuierlichen Herstellen von Span-, Faser- o.dgl. Platten
DE3044671A1 (de) * 1980-11-27 1982-06-03 Küsters, Eduard, 4150 Krefeld Verfahren und vorrichtung zur kontinuierlichen herstellung von strangfoermigen materialien
DE3107589C2 (de) * 1981-02-27 1986-01-30 Bison-Werke Bähre & Greten GmbH & Co KG, 3257 Springe Vorrichtung zur kontinuierlichen Herstellung von Span-, Faser- oder dergleichen Platten
DE3206558A1 (de) * 1982-02-24 1983-09-01 Santrade Ltd., 6002 Luzern Doppelbandpresse
DE3441839A1 (de) * 1984-08-13 1986-02-20 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Verfahren und einrichtung zur kontinuierlichen herstellung von anorganisch gebundenen werkstoffen, insbesondere von werkstoffplatten
DE3539364A1 (de) * 1985-11-06 1987-05-14 Fraunhofer Ges Forschung Verfahren zur kontinuierlichen herstellung von span- oder faserplatten
DE3734180C2 (de) * 1987-10-09 1998-01-29 Kuesters Eduard Maschf Doppelbandpresse zur Herstellung von Holzspanplatten und dergleichen

Also Published As

Publication number Publication date
DE3928626C1 (ko) 1991-01-24
EP0415184A3 (en) 1991-07-31
US5135693A (en) 1992-08-04
CA2023947C (en) 1994-04-12
EP0415184A2 (de) 1991-03-06
DE59002018D1 (de) 1993-08-26
ATE91660T1 (de) 1993-08-15
CA2023947A1 (en) 1991-03-01

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