EP1089857B1 - Verfahren und vorrichtung zur herstellung von faserzement-platten - Google Patents
Verfahren und vorrichtung zur herstellung von faserzement-platten Download PDFInfo
- Publication number
- EP1089857B1 EP1089857B1 EP99926188A EP99926188A EP1089857B1 EP 1089857 B1 EP1089857 B1 EP 1089857B1 EP 99926188 A EP99926188 A EP 99926188A EP 99926188 A EP99926188 A EP 99926188A EP 1089857 B1 EP1089857 B1 EP 1089857B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- perforated cylinder
- cylinder box
- layer
- thickness
- suspension
- 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
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Images
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
- B28B1/30—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon
- B28B1/40—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon by wrapping, e.g. winding
- B28B1/42—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon by wrapping, e.g. winding using mixtures containing fibres, e.g. for making sheets by slitting the wound layer
-
- 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
- B28B1/527—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 rotating drum, e.g. a sieve drum, from which the materials are picked up by a felt
-
- 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
- B28B17/0072—Product control or inspection
Definitions
- the present invention relates to a method and an apparatus for manufacturing of fiber cement panels or moldings, or the like. According to the preamble of claim 1.
- Fiber-reinforced composite materials have been used in the building materials industry for a long time successfully used. Initially, asbestos fibers were in a cement matrix distributed and shaped into plates or moldings. To this end the so-called Hatschek process was developed. After becoming known The extremely toxic effects of asbestos fibers have been attempted the asbestos fibers by cellulose fibers or other fiber materials such as synthetic fibers or glass fibers, to replace.
- the present invention is primarily on the manufacture of fiber cement slabs or equivalent - Shaped bodies, in which cellulose fibers are primarily used. In principle, however, the present invention is also suitable for other types of fibers. So here is the production of glass fleece or chipboard or fiber cement pipes includes.
- SU 996 186 A describes a device for controlling an asbestos cement plant, when regulating the thickness of the nonwoven layer by influencing it the machine speed and the material concentration. The However, the level in the screen cylinder boxes is always kept constant. A similar The method is also described in SU 986 798 A.
- US 4,440,596 A shows a device for applying the insulation to lead wires, these being passed through a fiber suspension.
- the thickness of the insulation must be influenced in the individual chambers of the bathroom Valves arranged through which the fill level of the respective chamber changes can be.
- the technology of such a system is the same as that of systems for Production of fiber cement boards not comparable. For example Actuators directly in the fabric bath when working with cement-containing suspensions not allowed.
- the object of the present invention is the method described above to further develop the thickness of the manufactured products with greater accuracy and reliability can be guaranteed.
- the fill level in the screen cylinder box is changed. So far, there have been autonomous level controls in a screen cylinder box known. However, these regulations only had the function of one to comply with the predetermined setpoint in order to allow it to run empty or overfill to prevent the screen cylinder box. In the present invention this setpoint is changed dynamically in order to increase the plate thickness accordingly regulate.
- the present invention can be used with conventional control devices be performed. However, it is particularly favorable if the Control functions can be integrated into an existing PLC or control system. In this case, the PID controllers are software by means of appropriate programs educated.
- corresponding algorithms are provided, for example, extreme values, or a moving averaging over a predetermined number of measured values carry out. In this way, a smooth and appropriate control behavior can be achieved.
- the regulation of the setpoint for the level of the filling of the Sieve cylinder box has a faster response than the control the consistency, i.e. Has priority over the regulation of the consistency.
- a change the level of filling of the screen cylinder box allows a special rapid change in the thickness of the products produced.
- the control range is limited, however, as the level only changes within certain limits can become long-term without endangering the stability of the process Plate thickness drifts should therefore not only be caused by the level change be balanced in the screen cylinder boxes, but in known per se Way by regulating the consistency in the premixer.
- the machine speed can also be changed.
- the level is the first in the event of control deviations is changed in the screen cylinder box, then with a slightly slower response the machine speed and only when these measures not completely sufficient, affects the consistency in the premixer becomes.
- the wetted area of the screen cylinder is reduced and less fabric applied to the screen cylinder drums, which ultimately results in a Reducing the thickness of the manufactured product leads to compensation contributes to the deviation.
- a other effect used For example, if it turns out that the middle one Thickness of the product meets the requirements, but at a measuring point a positive control deviation, a negative one at another measuring point If there is a control deviation, then the total feed quantity in the screen cylinder box maintained, but at the point of the positive control deviation the Supply quantity increased and the supply quantity at the point of the negative thickness deviation lowered.
- the present invention is both when using only one screen cylinder box, as well as when using of several screen cylinder boxes is applicable and an effective regulation of Allows plate thickness.
- the present invention relates to a device for producing Fiber cement panels or moldings or the like.
- a device for producing Fiber cement panels or moldings or the like According to claim 7.
- facilities are provided to measure the level. This can be designed, for example, as a pressure transmitter.
- the actuators for Changing the level in the screen cylinder boxes can be designed as control valves be in the supply lines for the suspension in the screen cylinder boxes are arranged.
- frequency-controlled feed pumps are also in the same way possible.
- the measurement of the thickness of the plates produced can be done without contact done by laser beams, ultrasound or the like, it is but mechanical scanning is also possible.
- the thickness distribution can also be in the cross-machine direction be kept within a precise tolerance range.
- Fig. 1 is the basic structure of a plant for the production of fiber cement panels shown.
- a fiber suspension is placed in a reaction vessel of relatively high consistency. Via a cloth pump 2 this suspension is fed to a premixer 3 in which the fiber suspension is mixed with Water is diluted to a predetermined consistency.
- a premixer 3 in which the fiber suspension is mixed with Water is diluted to a predetermined consistency.
- Go from premixer 3 a plurality of supply lines 4, in each of which a slide 5th is arranged.
- the fiber suspension from lines 4 is divided into two sieve cylinder boxes 6a and 6b connected in series, in each of which a screen cylinder drum 7a, 7b is arranged.
- the screen cylinder drums 7a, 7b are immersed in the fiber suspension contained in the sieve cylinder boxes 6a, 6b is present, so that a layer of the fiber suspension is attached to the screen cylinder drum 7a, 7b.
- the rotation of the screen cylinder drums 7a, 7b this layer led out of the suspension bath and a first drainage subjected.
- the on the screen cylinder drums 7a, 7b formed layer removed and transferred to the felt belt 8.
- the further dewatered layer is removed from the felt belt 8 and placed on a conveyor 11.
- Plates are dried further and in further, not shown Processing steps, if necessary, to give moldings, such as corrugated sheets, further processed.
- Non-contact sensors 12 are provided in the area of the conveyor 11, which detect the plate thickness with the help of laser beams.
- the felt ribbon 8 is after passing through the format roller 10 in a corresponding device 13 cleaned to be fed again to the screen cylinder drums 7a and 7b to become.
- a large number of control lines 14 are sensors and actuators, which are described below with a not shown Process control device connected.
- FIG. 2 shows the basic sequence of the control method according to the invention.
- three measured values a l , a m and a r are determined via the sensors 12, each of which corresponds to a measured value of the plate thickness in the left, in the middle and in the right area in the width direction.
- a first calculation step which is carried out in box 100, the measured values from the thickness measurement are processed for the first time.
- the individual measured values a l , a m and a r are filtered in order to rule out incorrect measurements that show impossible or senseless measured values.
- the measured values are smoothed to compensate for random fluctuations, and the arithmetic mean of the filtered and smoothed measured values is formed in order to calculate the average plate thickness.
- the core area of the actual regulation of the plate thickness is carried out in box 101 shown with broken lines.
- the measured values from the thickness calculation 100 are fed to a first controller 102, in which the target value for the level of the screen cylinder boxes is calculated as a manipulated variable.
- the output of the controller 102 is fed to a screen cylinder box level control 103, which is designed in a manner known per se. This means that the level of the filling height of the fiber suspension within the screen cylinder boxes 6a, 6b is detected by appropriate sensors and is regulated to the setpoint value that is output by the control 102.
- a cross section thickness control is carried out in a controller 104.
- a positive control signal is output for the corresponding supply line, while a negative control signal is output for the other supply lines.
- the control signals from the controllers 103 and 104 are additively superimposed at 105 and fed to the actuators 106.
- the actuators 106 can be speed-controlled feed pumps or, if constant-feed pumps are used or if gravity is used, corresponding control valves.
- controller 107 there is a signal for changing the machine speed generates a main drive 108 for the conveying speed of the felt belt 8 is supplied.
- controller 109 signals for the Adjustment of the consistency generated in the premixer.
- flow regulators 111a and 111b for the dilution water which the Premixer 3 is supplied, controlled.
- the cloth pump 112 is frequency controlled.
- the regulators 111a and 111b regulate corresponding valves 113a and 113b for the dilution water. If necessary can also be designed to be flow-controllable.
- the controllers 102, 104, 107 and 109 are each designed as PID controllers or simulated in software by a PID controller. Basically you can do it assume that the controls are set so that a thickness deviation is a Response of controllers 102 and 104, which immediately, i.e. about the next Plate is effective. In contrast, in controller 107 there is an average over several plates formed, so that a correspondingly slower reaction is obtained.
- the Controller 109 only reacts when the controllers 102 and / or are deflected too much 107th
- the plate thickness of the plates produced can are kept very precisely at the required setpoint. That way the waste is reduced and the reliability of the production is increased. On in this way, a significant saving in raw material can be achieved.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
- Panels For Use In Building Construction (AREA)
- Producing Shaped Articles From Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
Claims (12)
- Verfahren zur Herstellung von Faserzement-Platten bzw. -Formkörpern o. dgl., mit folgenden Schritten:Herstellen einer Fasersuspension aus einem zementhaltigen Bindemittel, in dem Zellulosefasern und oder ähnliche Fasern verteilt sind;Verdünnen der Fasersuspension mit Wasser auf einen vorbestimmten Feststoffgehalt;Zuführen der verdünnten Fasersuspension in mindestens einen Siebzylinderkasten (6a, 6b), wobei das Niveau der Füllung des Siebzylinderkastens (6a, 6b) auf einen Sollwert geregelt wird;Auftragen der verdünnten Fasersuspension auf eine im Siebzylinderkasten (6a, 6b) angeordnete Siebzylindertrommel (7a, 7b);Übertragen der an der Siebzylindertrommel (7a, 7b) ausgebildeten Schicht der Fasersuspension auf ein Filzband (8);Trocknen und Pressen der auf dem Filzband (8) befindlichen Schicht;Abnehmen der Schicht von Filzband (8) zur Herstellung von Platten oder Formkörpern;Messen der Dicke der vom Filzband (8) abgenommenen Schicht;Regeln der Stoffdichte der in den Siebzylinderkasten (6a, 6b) zugeführten Suspension,
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Regelung des Sollwerts für das Niveau der Füllung des Siebzylinderkastens (6a, 6b) Priorität vor der Regelung der Stoffdichte hat.
- Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass zusätzlich zur Regelung des Sollwerts für das Niveau der Füllung des Siebzylinderkastens (6a, 6b) eine Regelung der Maschinengeschwindigkeit erfolgt, wobei die Regelung des obigen Sollwerts Priorität vor der Regelung der Maschinengeschwindigkeit hat.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Regelung der Maschinengeschwindigkeit Priorität vor der Regelung der Stoffdichte hat.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass über die Breite der vom Filzband (8) abgenommenen Schicht die Dicke an mehreren Stellen gemessen wird, und dass die Fasersuspension an mehreren Stellen in den Siebzylinderkasten (6a, 6b) eingeführt wird, wobei die Regelung der Zufuhr zu den einzelnen Stellen in Abhängigkeit von der ermittelten Messwerten der zugehörigen Messstellen erfolgt.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass bei einer positiven Abweichung der Dicke an einer Messstelle eine Vergrößerung des Zuflusses an der entsprechenden Zufuhrstelle und eine Verringerung des Zuflusses an den übrigen Zufuhrstellen bewirkt wird.
- Vorrichtung zur Herstellung von Faserzement-Platten bzw. -Formkörpern o. dgl. mit:mindestens einem Vormischer (3) zur Bereitstellung einer Fasersuspension;mindestens einem Siebzylinderkasten (6a, 6b) mit einer darin drehbar angeordneten Siebzylindertrommel (7a, 7b);einem Filzband (8) zur Aufnahme einer auf der Siebzylindertrommel (7a, 7b) ausgebildeten Schicht aus der Fasersuspension;einer Einrichtung zum Abnehmen der Schicht vom Filzband (8);mindestens einer Einrichtung (12) zum Messen der Dicke der abgenommenen Schicht;einer Regelungseinrichtung zur Regelung der Dicke der abgenommenen Schicht,eine weitere Regelungseinrichtung zur Regelung des Niveaus der Füllung des Siebzylinderkastens (6a, 6b) auf einen Sollwert mit Stellgliedern zur Einstellung des Niveaus der Füllung des Siebzylinderkastens (6a, 6b);
- Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass mehrere Einrichtungen (12) zum Messen der Dicke der Schicht vorgesehen sind, und dass diesen Einrichtungen Stellglieder (12) zugeordnet sind, die die Zufuhr der Suspension zum Siebzylinderkasten (6a, 6b) regeln.
- Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die Stellglieder (5) mit Zufuhröffnungen zur Zufuhr der Suspension in den Siebzylinderkasten (6a, 6b) in Verbindung stehen.
- Vorrichtung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass weitere Stellglieder zur Änderung der Stoffdichte der Fasersuspension im Vormischer (3) vorgesehen sind.
- Vorrichtung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass weitere Steilglieder zur Änderung der Maschinengeschwindigkeit vorgesehen sind.
- Vorrichtung nach einem der Ansprüche 7 bis 11, dadurch gekennzeichnet, dass mehrere Siebzylinderkästen (6a, 6b) hintereinander geschaltet sind, und dass die Regelungseinrichtung Stellglieder (5) zur Regelung des Niveaus der Füllung jedes Siebzylinderkastens (6a, 6b) umfasst.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0108698A AT409944B (de) | 1998-06-23 | 1998-06-23 | Verfahren zur herstellung von faserzement-platten |
AT108698 | 1998-06-23 | ||
PCT/AT1999/000159 WO1999067071A1 (de) | 1998-06-23 | 1999-06-17 | Verfahren zur herstellung von faserzement-platten |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1089857A1 EP1089857A1 (de) | 2001-04-11 |
EP1089857B1 true EP1089857B1 (de) | 2002-09-25 |
Family
ID=3506289
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99926188A Expired - Lifetime EP1089857B1 (de) | 1998-06-23 | 1999-06-17 | Verfahren und vorrichtung zur herstellung von faserzement-platten |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1089857B1 (de) |
AT (2) | AT409944B (de) |
AU (1) | AU4353799A (de) |
DE (1) | DE59902858D1 (de) |
WO (1) | WO1999067071A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107810095A (zh) * | 2015-06-29 | 2018-03-16 | 埃特尼特股份有限公司 | 圆网抄取工艺 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10019824A1 (de) * | 2000-04-20 | 2001-10-25 | Lothar Rauer | Herstellungsverfahren für Baustoffe und Bauteile unter Verwendung fasriger Materialien |
BE1023094B9 (nl) * | 2016-04-21 | 2018-03-13 | Etex Services Nv | Hatschek proces |
BE1023744B1 (nl) * | 2016-04-21 | 2017-07-10 | Eternit Nv | Hatschek proces |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2250314A1 (en) * | 1973-07-24 | 1975-05-30 | Everitube | Reinforced asbestos cement sheet production process - main and reinforcing pastes on support form alternate strips |
SU885021A1 (ru) * | 1980-03-19 | 1981-11-30 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт По Автоматизации Предприятий Промышленности Строительных Материалов | Способ управлени формованием асбестоцементных труб |
SU895665A1 (ru) * | 1980-04-14 | 1982-01-07 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Автоматизации Предприятий Промышленности Строительных Материалов | Устройство управлени машиной дл формировани асбестоцементных изделий |
US4543159A (en) * | 1981-02-11 | 1985-09-24 | National Gypsum Company | Reinforced cement sheet product containing no asbestos for fabricating on Hatschek machine |
SU986798A1 (ru) * | 1981-04-13 | 1983-01-07 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт По Автоматизации Предприятий Промышленности Строительных Материалов | Способ регулировани работы асбестоментных формовочных машин |
SU1006227A1 (ru) * | 1981-07-03 | 1983-03-23 | Липецкое Специализированное Конструкторское Бюро Всесоюзного Научно-Производственного Объединения "Союзавтоматстром" Министерства Промышленности Строительных Материалов Ссср | Способ автоматического регулировани работы асбестоцементной формовочной машины |
SU996186A1 (ru) * | 1981-09-16 | 1983-02-15 | Липецкое Специализированное Конструкторское Бюро Всесоюзного Научно-Производственного Объединения "Союзавтоматстром" Министерства Промышленности Строительных Материалов Ссср | Устройство дл управлени работой многоцилиндровой асбестоцементной формовочной машиной |
SU1009769A1 (ru) * | 1981-12-17 | 1983-04-07 | Липецкое Специализированное Конструкторское Бюро Всесоюзного Научно-Производственного Объединения "Союзавтоматстром" | Устройство управлени приготовлением асбестоцементной суспензии |
US4440596A (en) * | 1982-05-21 | 1984-04-03 | Northern Telecom Limited | Control of diameter of fiber insulation on conductors |
GB2161415A (en) * | 1984-07-06 | 1986-01-15 | Pilkington Brothers Plc | Process for making cement composite materials |
-
1998
- 1998-06-23 AT AT0108698A patent/AT409944B/de not_active IP Right Cessation
-
1999
- 1999-06-17 AU AU43537/99A patent/AU4353799A/en not_active Abandoned
- 1999-06-17 AT AT99926188T patent/ATE224795T1/de not_active IP Right Cessation
- 1999-06-17 WO PCT/AT1999/000159 patent/WO1999067071A1/de active IP Right Grant
- 1999-06-17 DE DE59902858T patent/DE59902858D1/de not_active Expired - Fee Related
- 1999-06-17 EP EP99926188A patent/EP1089857B1/de not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107810095A (zh) * | 2015-06-29 | 2018-03-16 | 埃特尼特股份有限公司 | 圆网抄取工艺 |
Also Published As
Publication number | Publication date |
---|---|
EP1089857A1 (de) | 2001-04-11 |
WO1999067071A1 (de) | 1999-12-29 |
ATE224795T1 (de) | 2002-10-15 |
AU4353799A (en) | 2000-01-10 |
ATA108698A (de) | 2002-05-15 |
DE59902858D1 (de) | 2002-10-31 |
AT409944B (de) | 2002-12-27 |
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