EP0429820A2 - Procédé et dispositif pour la commande du processus de fabrication dans la production en continu d'éléments à base de plastic - Google Patents

Procédé et dispositif pour la commande du processus de fabrication dans la production en continu d'éléments à base de plastic Download PDF

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Publication number
EP0429820A2
EP0429820A2 EP90119654A EP90119654A EP0429820A2 EP 0429820 A2 EP0429820 A2 EP 0429820A2 EP 90119654 A EP90119654 A EP 90119654A EP 90119654 A EP90119654 A EP 90119654A EP 0429820 A2 EP0429820 A2 EP 0429820A2
Authority
EP
European Patent Office
Prior art keywords
press
pressure
hydration
segments
individual
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.)
Withdrawn
Application number
EP90119654A
Other languages
German (de)
English (en)
Other versions
EP0429820A3 (en
Inventor
Volker Dipl.-Ing. Thole
Thomas Dipl.-Holzwirt 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 Foerderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Foerderung 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 Foerderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Publication of EP0429820A2 publication Critical patent/EP0429820A2/fr
Publication of EP0429820A3 publication Critical patent/EP0429820A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
    • B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
    • 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
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/0063—Control arrangements
    • B28B17/0081—Process control
    • 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
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/26—Program-control arrangements

Definitions

  • the invention relates to a method according to the preamble of claim 1 and an apparatus for performing the method.
  • a control device for a compression unit of a belt press is already known from DE PS 33 16 946.
  • This invention takes advantage of the fact that the reaction of the binder with water to form the dihydrate is an exothermic process, i. H. it releases heat. It is therefore possible to determine the end of hydration by evaluating the hydration temperature-time curve, namely as the time from the start of the litter to the maximum of the temperature curve. In laboratory examinations, this measurement is usually carried out under quasi-adiabatic conditions in order to avoid heat flow and thus a falsification of the temperature-time curve. For technical processes, it is usually sufficient to determine the temperature profile under the given conditions.
  • the temperature development becomes exothermic hardening gypsum binder mass used as a control variable.
  • the end of hydration is reached when the temperature development exceeds a maximum.
  • a measuring device is required which continuously determines the temperature development, so that an additional device is required in addition to the already existing pressure measurement.
  • a temperature measurement is also fraught with uncertainty factors which do not guarantee exact measurement value acquisition.
  • temperature compensation processes between the material, the compression unit and the environment are to be mentioned as disturbance variables, which cannot be compensated from an economic point of view. Under practical conditions, it is doubtful whether temperature fluctuations in the materials are not considered incorrect measurements.
  • both a continuous and a batch process can be used for the compression.
  • the most important continuous process in common is that the belt press consists of a large number of individual press segments arranged one after the other (Fig. 1).
  • Such a press describes e.g. B. H. Soiné in wood as raw material 42 (1984), pages 63-66.
  • the invention is based on belt presses of this type with press segments arranged one after the other.
  • the object of the invention is to provide a simpler and cheaper method for controlling the production process and to provide a corresponding device.
  • the binder When the binder is mixed with water, the hemihydrate goes into solution up to the saturation concentration, and dihydrate forms again through hydration, the solubility of which is only about the fourth part of that of the hemihydrate, so that dihydrate is deposited in crystalline form from the solution which is supersaturated with dihydrate . This process continues until the hemihydrate is completely converted into dihydrate, and a polycrystalline, space-stable solid is formed in this way.
  • the timing of the hydration process is characterized in technology by the parameters stiffening start, stiffening end and end of hydration.
  • the start of stiffening and the end of stiffening indicate a certain consistency of the gypsum mixture, the end of hydration denotes the end of the conversion of hemihydrate to the dihydrate.
  • a compression process is now used in the production of certain plate-shaped workpieces based on gypsum, for example in the production of fiber-reinforced gypsum boards or gypsum-bonded particle boards in a semi-dry process.
  • the rule applies that the compression process may begin at the latest when the stiffening begins and may be ended at the earliest after the end of the stiffening, better still after the end of hydration; this is the only way to ensure the maximum strength of the material.
  • this source pressure is now used to control the production process.
  • Fig. 2 shows a temperature-time curve versus the pressure-time curve. It follows that the measurement of the source pressure gives the same results as that of the temperature. However, the invention has decisive advantages over the prior art. First, no additional devices such as. B. a temperature measuring device is necessary, and secondly, the measurement of the source pressure is not dependent on environmental influences.
  • the invention has further advantages. It is possible according to the invention if the maximum swelling pressure and so that the end of hydration is reached, the following press segments are set to zero. A decisive energy saving is thereby achieved. This is important because the setting behavior can be influenced within limits by adding adjusting agents (retarders / accelerators). Thus, e.g. B. with the addition of an accelerator, the end of hydration can be reached earlier, so that a "shorter" belt press would in itself be sufficient. In the method according to the invention, however, the press segments which follow are then set to zero after the end of the hydration, so that they no longer perform any work and energy savings are thereby achieved. Such a differentiated control is not possible with all methods of the prior art.
  • the belt press has to do work until the end of its overall length.
  • the process according to the invention can thus save the work which the press segments would have to do after the end of hydration has been reached.
  • the subsequent press segment is reset when the condition regarding the pressure P. and P (n + 1) ⁇ ⁇ P n is satisfied.
  • Fig. 1 shows a section of the construction of a continuous belt press 1 with press segments 4 arranged one after the other.
  • Fig. 1 also shows a fleece transfer device device 2 and a plate removal device 3.
  • Fig. 3 shows the pressure measurement and the control device.
  • the device consists for each individual press segment of a target / actual value comparator 5, a distance measuring device 6 and a pump 7. Each individual press segment 4 is then connected to a comparator 8.
  • An advantage of the invention is that the distance measuring device is present in the already known belt presses from the prior art. As an additional device, only a comparator 8 is now provided, which compares the individual pressures of the individual press segments 4.
  • a mixture is now fed to the press via the nonwoven transfer device 2, it is compressed by the belt press 1 in accordance with the specification (for example, predetermined plate thickness).
  • the necessary pressure is applied by the individual press segments 4 (corresponds to the cylinders). If the distance measuring device 6 now detects a deviation from the target value, the pump 7 adjusts so that the predetermined thickness can always be maintained. According to the invention, these pressure measurements are now passed on to the comparator 8. Now is the condition P (n-1) ⁇ P n and P (n + 1) ⁇ ⁇ P n fulfilled, the following press segment is switched to zero by the control. This is illustrated in Fig. 4 at two measuring points.
  • Fig. 4 shows the characteristic course of the swelling pressure over time.
  • example 1 shows that the condition P (n-1) ⁇ P n is not fulfilled. In this case, the subsequent press segment does not become zero posed.
  • Example 2 shows a case where the condition and P (n + 1) ⁇ ⁇ P n is satisfied. In this case, the subsequent press segment is set to zero. The remaining press segments therefore no longer have to do any work. The entire system can thus be controlled precisely and manages with minimal energy.
  • the invention provides a way of optimally controlling a continuous belt press 1 with little outlay on equipment. Another advantage is that device parts can be used for this method, which are already available on conventional belt presses of the prior art. According to the invention, the fact is taken advantage of that the source pressure is used for control, and a device is specified for this purpose.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Automation & Control Theory (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
EP19900119654 1989-11-28 1990-10-13 Process and apparatus for controlling the manufacturing process in the continuous production of elements having a plaster binder Withdrawn EP0429820A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3939280 1989-11-28
DE3939280A DE3939280C1 (fr) 1989-11-28 1989-11-28

Publications (2)

Publication Number Publication Date
EP0429820A2 true EP0429820A2 (fr) 1991-06-05
EP0429820A3 EP0429820A3 (en) 1991-12-11

Family

ID=6394331

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900119654 Withdrawn EP0429820A3 (en) 1989-11-28 1990-10-13 Process and apparatus for controlling the manufacturing process in the continuous production of elements having a plaster binder

Country Status (4)

Country Link
US (1) US5116555A (fr)
EP (1) EP0429820A3 (fr)
CA (1) CA2030822A1 (fr)
DE (1) DE3939280C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995001942A1 (fr) * 1993-07-10 1995-01-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procede de regulation du comoprtement d'hydratation du platre dans la fabrication des materiaux composites
US6217892B1 (en) * 1997-10-24 2001-04-17 Joseph A. King Water treatment composition

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2676386A1 (fr) * 1991-05-15 1992-11-20 Scient Tech Batimen Centre Procede et dispositif de fabrication de blocs de construction a partir d'un liant hydraulique tel que du platre, d'une charge inerte telle que du sable et d'eau.
US5788996A (en) * 1993-11-12 1998-08-04 Tecfim Apparatus for manufacturing building blocks from a hydraulic binder such as plaster, an inert filler such as sand, and water
US6197235B1 (en) * 1999-02-09 2001-03-06 United States Gypsum Company Method of manufacture for textured surface panels and panel products made therefrom
US6740395B2 (en) 2001-12-21 2004-05-25 United States Gypsum Company Substrate smoothed by coating with gypsum-containing composition and method of making
ITMI20020799A1 (it) * 2002-04-15 2003-10-15 Oms Impianti Spa Apparecchiatura per la produzione in continuo di pannelli in materia plastica espansa
DE102006009108A1 (de) * 2006-02-24 2007-08-30 Dieffenbacher Gmbh + Co. Kg Verfahren und kontinuierlich arbeitende Presse zur Herstellung von Werkstoffplatten
CN114102827B (zh) * 2020-09-01 2024-03-12 广东博智林机器人有限公司 布料机的布料方法、装置及布料机、存储介质

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071999A (en) * 1934-03-17 1937-02-23 Laucks I F Inc Continuous press for production of board-like products
DE1778693A1 (de) * 1968-05-24 1971-08-05 Hennecke Gmbh Maschf Verfahren und Vorrichtung zum Herstellen von Schaumstoffprofilen,aus beim Vermischen schnell miteinander reagierender Komponenten
CH514429A (de) * 1970-11-05 1971-10-31 Uniboard Ag Verfahren zum Pressen von Holzspanplatten und Vorrichtung zur Durchführung des Verfahrens
CA973462A (en) * 1971-02-25 1975-08-26 Per A. Jaatinen Continuous action sheet press
CH552462A (de) * 1971-07-14 1974-08-15 Mets Nv Konstruktiewerkhuizen Kontinuierlich arbeitende presse zum herstellen von platten, wie span- oder faser-platten.
DE2140105A1 (de) * 1971-08-10 1973-02-22 Kuesters Eduard Vorrichtung zur ausuebung einer flaechenpressung
US4042314A (en) * 1971-12-02 1977-08-16 Dynamit Nobel Aktiengesellschaft Apparatus for the continuous manufacture of phenolic resin foam in endless sheets
DE2343427C3 (de) * 1973-08-29 1986-10-02 Peter 7869 Holzinshaus Voelskow Kontinuierlich arbeitende Preß- und Kalibriervorrichtung zur Herstellung von Spanplatten
DE2404523B2 (de) * 1974-01-31 1979-06-13 Maschinenfabrik J. Dieffenbacher Gmbh & Co, 7519 Eppingen Kontinuierlich arbeitende Presse
DE2421955A1 (de) * 1974-05-07 1975-12-04 Sandco Ltd Bandpresse, insbesondere hydraulische doppelbandpresse, fuer fortlaufend zu behandelndes material
SE408395B (sv) * 1974-10-30 1979-06-11 Kuesters Eduard Press med tva tryckplattor och sekerhetsanordning
DE2451894B2 (de) * 1974-10-31 1976-11-04 Küsters, Eduard, 4150 Krefeld Presse, insbesondere zur kontinuierlichen herstellung von holzspanplatten und schaumstoffplatten
US4278624A (en) * 1978-10-25 1981-07-14 Kornylak Corporation Fluid film continuous processing method and apparatus
DE3013231C2 (de) * 1980-04-03 1987-01-22 Constructiewerkhuizen De Mets N.V., Kachtem, Izegem Verfahren zum kontinuierlichen Verpressen eines Vlieses sowie Vorrichtung zur Durchführung des Verfahrens
US4311632A (en) * 1980-06-16 1982-01-19 Hiraoka Giken Kogyo Co., Ltd. Process for molding a concrete pipe
FI69591C (fi) * 1983-02-09 1986-03-10 Asko Sarja Foerfarande och anordning foer komprimering av betong
DE3316946C2 (de) * 1983-05-09 1986-07-03 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Einrichtung zum kontinuierlichen Herstellen von Werkstücken unter Verwendung exotherm erhärtender Bindemittel
DE3413396A1 (de) * 1984-04-10 1985-10-24 G. Siempelkamp Gmbh & Co, 4150 Krefeld Anlage fuer das kontinuierliche pressen einer pressgutmatte im zuge der herstellung von spanplatten, faserplatten u.dgl.
DE3502006A1 (de) * 1985-01-23 1986-07-24 Hahn, Ortwin, Prof. Dr.-Ing., 4790 Paderborn Verfahren zum schaeumen und sintern von kunststoffen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995001942A1 (fr) * 1993-07-10 1995-01-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procede de regulation du comoprtement d'hydratation du platre dans la fabrication des materiaux composites
US5846317A (en) * 1993-07-10 1998-12-08 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Method of controlling the hydration behavior of gypsum in the manufacture of composite materials
US6217892B1 (en) * 1997-10-24 2001-04-17 Joseph A. King Water treatment composition

Also Published As

Publication number Publication date
US5116555A (en) 1992-05-26
EP0429820A3 (en) 1991-12-11
CA2030822A1 (fr) 1991-05-29
DE3939280C1 (fr) 1991-02-28

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