EP1316645A1 - Verfahren und Gerät zur Bestimmung der durch ein Formiersieb einer Faserstoffsuspension entnommenen Fasermenge - Google Patents
Verfahren und Gerät zur Bestimmung der durch ein Formiersieb einer Faserstoffsuspension entnommenen Fasermenge Download PDFInfo
- Publication number
- EP1316645A1 EP1316645A1 EP02026637A EP02026637A EP1316645A1 EP 1316645 A1 EP1316645 A1 EP 1316645A1 EP 02026637 A EP02026637 A EP 02026637A EP 02026637 A EP02026637 A EP 02026637A EP 1316645 A1 EP1316645 A1 EP 1316645A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fiber
- substrate
- measured
- amount
- contact pressure
- 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
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
Definitions
- the invention relates to a method and an apparatus for determining the by Forming sieve of a fiber quantity taken from fiber suspension, during which a substrate provided in particular with a pile against the circumferential one Forming fabric is pressed.
- Forming fabrics are used in machines that the Production of a fibrous web, in particular a paper or cardboard web, serve from a fiber suspension.
- the aim of the invention is to provide an improved method and an improved device of the type mentioned at the beginning, which is the measurement or testing of fiber drag make it reproducible on forming fabrics.
- this object is achieved by a method for determination the amount of fiber withdrawn through a forming wire from a fiber suspension, in which a substrate provided with a pile against the circumferential one Forming screen pressed and the contact pressure measured and in the process Predeterminable contact pressure is set, the contact time during which the Substrate at the pre-definable contact pressure against the rotating forming fabric is pressed, is measured within the measured, specified pressing time accumulated amount of fiber is determined and the particular accumulated Amount of fiber in particular for a corresponding standardization to that measured presettable contact pressure and to the measured presettable Contact time is related.
- the measurement of the contact pressure, the measurement of time and / or the determination of the accumulated fiber quantity is carried out automatically.
- the pressing time can, for example, from the sieving speed, the sieve length and a predeterminable number of sieve rotations can be calculated.
- the process is the total swept during the relevant pressing time Surface of the rotating forming screen determined and the specific Accumulated amount of fibers on this screen surface, which is covered overall related to determine the amount of sieve per sieve area unit.
- the accumulation in the area of at least one barrier is advantageous Determines the amount of fiber. So the fiber load can possibly also the area occupied by the fibers, because the fibers be dammed up in front of a respective barrier.
- the otro fiber mass is determined. there it is advantageous if to determine the otro fiber mass in a predeterminable Monitoring area the total mass of the substrate, the fibers and the Forming screen and the mass of water contained in the fiber quantity measured and from this the otro fiber mass is calculated. This is possible, after the mass of the substrate and the sieve is known and after one Measurement of the mass of the water contained in the fiber quantity from the determined Total mass of fibers finally the otro fiber mass can be calculated can.
- Another useful embodiment of the method according to the invention is characterized by the fact that the moisture is used to determine the fiber weight Fibers are dried together with the substrate, the whole is weighed and the known substrate weight is subtracted from the total weight.
- a respective quantity or weight measurement at least partly radiometric, by means of ultrasound, by means of gamma radiation and / or the like.
- a piece of fabric can be used as the substrate.
- a piece of felt is a piece of felt, a piece of velor, a fine one Brush or the like can be used. It is essential that this measuring substrate in particular has a pile.
- a device for determination the amount of fiber withdrawn through a forming wire from a fiber suspension in particular to carry out the method according to one of the preceding Claims, with a pressure measuring device for measuring the contact pressure, with which a substrate provided with a pile against the rotating forming fabric is pressed, the contact pressure being adjustable, and with a time measuring device for measuring the contact time during which the Substrate with a pre-definable contact pressure against the rotating forming fabric is pressed.
- FIG. 1 shows a schematic representation of two rotating forming fabrics 10, 12 a machine for producing a fibrous web from a fibrous suspension.
- the fibrous web to be produced can in particular be a Trade paper or cardboard web.
- the forming fabrics 10, 12 shown can thus, for example, be provided in the wire section of a paper machine.
- various measurement points M purely by way of example indicated for a respective fiber drag measurement. A respective measurement can be done on the paper and running side.
- FIGS. 2 and 3 each show an embodiment in a schematic representation of a fiber drag measuring device 14.
- the respective device 14 can in particular the determination of the fiber suspension by a forming wire 10, 12 serve removed amount of fiber.
- the measuring device 14 is equipped with one or more pressure sensors 18 or pressure measuring cells comprehensive pressure measuring device for measuring the contact pressure and provided with a time measuring device for measuring the pressing time. there a defined contact pressure can be set.
- the measuring device 14 comprises a control and / or evaluation unit 20, in particular a computing unit, which comprises a "CPU” and by means of which the pressing time TA can be calculated and displayed.
- the device 14 also includes a fiber quantity measuring device 22 in which it can be, for example, a fiber mass measuring device. there In particular, a radiometric fiber quantity measuring device 22 can be provided his.
- the felt weight before the test is subtracted from the felt weight resulting from the test, with which, for example, the accumulated amount of fibers or fiber mass is obtained in "mg".
- the device 14 can also have means 24 for displaying the measured or calculated contact time. A corresponding one can do this, for example Display should be provided. As can be seen from FIG. 3, moreover a multifunction display 26, a measurement pressure and status display 28 and a keyboard or input keyboard 30 may be provided.
- the one preferably provided with a pile and, for example, by a piece of felt, a velor piece or a small brush formed substrate 16 is over a Clamping device 32 clamped on the device 14.
- This substrate 16 can optionally be guided over at least one barrier 38, of which the present one If, for example, two are provided.
- Such a barrier serves as a damming bar, where the fibers accumulate during the defined measurement period.
- Fig. 2 is the fiber accumulation resulting after the defined measurement period Inscribed "34".
- the measured or calculated contact time are displayed.
- about the Display means 28 can e.g. also be signaled that the measured contact pressure lies within or outside a predeterminable permitted range.
- the measuring devices and display means can be in the control and / or evaluation unit 20 integrated or controlled by this.
- the measuring devices are such as the fiber quantity measuring device 22, the display or signaling means 24 - 28 and the control and / or evaluation unit 20 in one Integrated device part.
- This measuring device and the control and / or evaluation unit etc. can at least partially, however, also be accommodated in separate device parts. In this case, at least some of the measured values, in particular via infrared, can be obtained from the be transferred to the other part of the device.
- a software program can be integrated in the control and / or evaluation unit 20 his.
- the control and / or evaluation unit 20 can in particular also be programmable.
- Fig. 4 shows a schematic representation of a fourdrinier wire of a paper machine.
- M A possible exemplary measuring point for a fiber tow measurement is also here again marked with "M”.
- the display means 28 can, for example, lamps of different colors to signal that the contact pressure in the permitted range or is outside the permitted range.
- a contact pressure lying in the permitted range for example a green lamp and if it is outside the permitted range a red lamp.
- the pressing time is equal to the pressing time, an optical or, for example, is acoustic display possible.
- control and / or evaluation device or computing unit and the display means can be integrated in the measuring device.
- the computing unit in a second device possible, the off the paper or board machine is positioned. You can - as already mentioned - the pressure data of the measuring device, for example via infrared to the second device are transmitted.
- a software program can be integrated in the computing unit, which is an advantage entails that the results, for example, in tabular form and / or Chart shape can be displayed.
- the measurement is based on the principle that the fibers are on the substrate 16 accumulate. 2 and 3, the paper fibers gather in front of the optional ones Barriers 38. As already mentioned, embodiments are also fundamentally conceivable without such barriers.
- the sensors in question can determine the otro fiber mass Capture the entire "collection area" of the fibers.
- it can be a sensor be designed as a radioactive sensor to the total mass of the substrate, the otro fibers, water and sieve to measure, the mass of the Substrate and the sieve is known.
- a second sensor can, for example, as Microwave sensor can be designed to measure the water content. For determination the fiber mass then becomes the difference between those of the two sensors measured values obtained.
- the testing of fiber dragging is reproducible.
- the measuring device in question is equipped with a contact pressure display and a Control and / or evaluation unit or computing unit, the time of the measurement indicates equipped.
- This computing unit can also take pressure deviations into account and if necessary indicate that the measurement is invalid.
- any one can also be used for the substrate other materials or substances are used, these preferably always should have the same properties.
- the substance in question can be dated Device off during clamping (design condition of the device) with at least one Barrier are provided so that the fiber load may be caused by, for example stagnation distance measured in millimeters or the like because the fibers accumulate on such a barrier.
- the device is, for example, as in connection with the exemplary embodiments described equipped with a computer unit that automatically after Parameter input indicates the test time and is able to increase the fiber load determine. In the event of pressure deviations, this computing unit automatically detects the Measurement as invalid.
- the pressure deviations are visible, for example, by LEDs on the device made. These LEDs can also indicate the start and end of each Show measurement. Basically, for example, is also a display of a not plan to lay the measuring device conceivable.
- the measured values obtained can be measured using the measuring device, in particular via a appropriate software preferably evaluated on site and for example in Diagrams or curves can be prepared.
- the device can be equipped with an evaluation sensor, a respective one Quantity or weight measurement, at least partially, in particular radiometrically, by means of ultrasound, by means of gamma radiation and / or the like.
- the pressing time can be determined, for example, from the sieving speed the sieve quantity and a predeterminable number of sieve rotations become. For example, if A is the time it takes the sieve to circulate, and are provided, for example, forty sieve rotations for each measurement, this results in a measuring time of A x 40.
Landscapes
- Paper (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
- Fig. 1
- eine schematische Darstellung zweier umlaufender Formiersiebe einer Papiermaschine mit angedeuteten beispielhaften Messpunkten für eine jeweilige Faserschleppenmessung;
- Fig. 2
- eine schematische Schnittdarstellung einer mit Barrieren versehenen Ausführungsform eines Faserschleppmessgeräts,
- Fig. 3
- eine detailliertere schematische perspektivische Ansicht einer mit Barrieren versehenen Ausführungsform eines Faserschleppmessgeräts, in dem sowohl die Messeinrichtung und Anzeige- bzw. Signalisierungsmittel als auch die Steuer- und/oder Auswerteeinheit integriert sind, und
- Fig. 4
- eine schematische Darstellung eines Langsiebes einer Papiermaschine mit angedeutetem beispielhaftem Messpunkt für eine Faserschleppenmessung.
TA = f (vSieb, Sieblänge, vorgebbare Zahl der Siebumläufe)
308 mg / 96 m2 = 3,2 mg / m2.
- 10
- Formiersieb
- 12
- Formiersieb
- 14
- Faserschleppmessgerät
- 16
- Substrat
- 18
- Drucksensor
- 20
- Steuer- und/oder Auswerteeinheit, Recheneinheit
- 22
- Fasermengenmesseinrichtung
- 24
- Anzeigemittel, Display
- 26
- Multifunktionales Display
- 28
- Messdruck- und Statusanzeige
- 30
- Keyboard, Eingabetastatur
- 32
- Klemmeinrichtung
- 34
- Faseransammlung
- 36
- Langsieb
- M
- Messpunkt
Claims (28)
- Verfahren zur Bestimmung der durch ein Formiersieb (10, 12, 36) einer Faserstoffsuspension entnommenen Fasermenge, beim dem ein insbesondere mit einem Flor versehenes Substrat (16) gegen das umlaufende Formiersieb (10, 12, 36) gepresst und dabei der Anpressdruck gemessen und ein vorgebbarer Anpressdruck eingestellt wird, die Anpresszeit, während der das Substrat (16) bei dem vorgebbaren Anpressdruck gegen das umlaufende Formiersieb (10, 12, 36) gepresst wird, gemessen wird, die innerhalb der gemessenen vorgebbaren Anpresszeit angesammelte Fasermenge bestimmt wird und die bestimmte angesammelte Fasermenge insbesondere für eine entsprechende Normierung zu dem gemessenen vorgebbaren Anpressdruck und zu der gemessenen vorgebbaren Anpresszeit in Beziehung gesetzt wird.
- Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass die Messung des Anpressdrucks, die Messung der Zeit und/oder die Bestimmung der angesammelten Fasermenge automatisch durchgeführt werden. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass die Anpresszeit aus der Siebgeschwindigkeit, der Sieblänge und einer vorgebbaren Anzahl von Siebumläufen berechnet wird. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die während der betreffenden Anpresszeit insgesamt überstrichene Oberfläche des umlaufenden Formiersiebes (10, 12, 36) bestimmt und die bestimmte angesammelte Fasermenge auf diese insgesamt überstrichene Sieboberfläche bezogen wird, um die je Siebflächeneinheit anfallende Fasermenge zu bestimmen. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die sich im Bereich wenigstens einer Barriere (38) ansammelnde Fasermenge bestimmt wird. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die otro-Fasermasse bestimmt wird. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass zur Bestimmung der otro-Fasermasse in einem vorgebbaren Überwachungsbereich die Gesamtmasse des Substrates (16), der Fasern und des Formiersiebes (10, 12, 36) sowie die Masse des in der Fasermenge enthaltenen Wassers gemessen und daraus die otro-Fasermasse berechnet wird. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass zur Bestimmung des Fasergewichts die feuchten Fasern zusammen mit dem Substrat (16) getrocknet werden, das ganze gewogen wird und vom Gesamtgewicht das bekannte Substratgewicht abgezogen wird. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass eine jeweilige Mengen- bzw. Gewichtsmessung zumindest teilweise radiometrisch, mittels Ultraschall, mittels Gammastrahlung und/oder dergleichen erfolgt. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass als Substrat (16) ein Stoffstück verwendet wird. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass als Substrat (16) ein Filzstück, ein Veloursstück, eine feine Bürste oder dergleichen verwendet wird. - Gerät zur Bestimmung der durch ein Formiersieb (10, 12, 36) einer Faserstoffsuspension entnommenen Fasermenge, insbesondere zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, mit einer Druckmesseinrichtung (18) zum Messen des Anpressdrucks, mit dem ein insbesondere mit einem Flor versehenes Substrat (16) gegen das umlaufende Formiersieb (10, 12, 36) gepresst wird, wobei der Anpressdruck einstellbar ist, und mit einer Zeitmesseinrichtung zum Messen der Anpresszeit, während der das Substrat (16) bei einem vorgebbaren Anpressdruck gegen das umlaufende Formiersieb (10, 12, 36) gepresst wird.
- Gerät nach Anspruch 12,
dadurch gekennzeichnet, dass es eine Fasermengenmesseinrichtung (22) umfasst. - Gerät nach Anspruch 13,
dadurch gekennzeichnet, dass als Fasermengenmesseinrichtung eine Fasermassenmesseinrichtung (22) vorgesehen ist. - Gerät nach Anspruch 13 oder 14,
dadurch gekennzeichnet, dass eine radiometrische Fasermengenmesseinrichtung (22) vorgesehen ist. - Gerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass es eine Steuer- und/oder Auswerteeinheit (20) umfasst. - Gerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass mittels der Steuer- und/oder Auswerteeinheit (20) die Anpresszeit insbesondere aus der Siebgeschwindigkeit, der Sieblänge und einer vorgebbaren Anzahl von Siebumläufen berechenbar ist. - Gerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass es Mittel (24, 26) für eine Anzeige der gemessenen bzw. berechneten Anpresszeit umfasst. - Gerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass mittels der Steuer- und/oder Auswerteeinheit (20) die während der betreffenden Anpresszeit insgesamt überstrichene Oberfläche des umlaufenden Formiersiebes (10, 12, 36) bestimmbar und die bestimmte angesammelte Fasermenge auf diese insgesamt überstrichene Sieboberfläche beziehbar ist, um die je Siebflächeneinheit anfallende Siebmenge zu bestimmen. - Gerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass Mittel (28) vorgesehen sind, um zu signalisieren, dass der gemessene Anpressdruck innerhalb bzw. außerhalb eines vorgebbaren erlaubten Bereiches liegt. - Gerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass insbesondere optische und/oder akustische Mittel (24 - 28) vorgesehen sind, um zu signalisieren, dass die der Messzeit entsprechende vorgebbare Anpresszeit erreicht ist. - Gerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die Messeinrichtungen (22) sowie gegebenenfalls die Anzeige- bzw. Signalisierungsmittel (24 - 28) und die Steuer- und/oder Auswerteeinheit (20) in einem Geräteteil integriert sind. - Gerät nach einem der Ansprüche 12 bis 21,
dadurch gekennzeichnet, dass die Messeinrichtungen (22) und die Steuer- und/oder Auswerteeinheit (20) zumindest teilweise in getrennten Geräteteilen untergebracht sind. - Gerät nach Anspruch 23,
dadurch gekennzeichnet, dass zumindest ein Teil der Messwerte insbesondere über Infrarot von dem einen zum anderen Geräteteil übertragen wird. - Gerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass in der Steuer- und/oder Auswerteeinheit (20) ein Softwareprogramm integriert bzw. die Steuer- und/oder Auswerteeinheit (20) programmierbar ist. - Gerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass wenigstens eine Barriere (38) vorgesehen ist, in deren Bereich sich die Fasern ansammeln. - Gerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass Mittel (28) zur Signalisierung von Abweichungen des Anpressdrucks von jeweiligen vorgegebenen Druck vorgesehen sind. - Gerät nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass Mittel (32) zum Einspannen des Substrats (16) vorgesehen sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10159172A DE10159172A1 (de) | 2001-12-03 | 2001-12-03 | Verfahren und Gerät zur Bestimmung der durch ein Formiersieb einer Faserstoffsuspension entnommenen Fasermenge |
DE10159172 | 2001-12-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1316645A1 true EP1316645A1 (de) | 2003-06-04 |
EP1316645B1 EP1316645B1 (de) | 2005-11-09 |
Family
ID=7707785
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02026637A Expired - Lifetime EP1316645B1 (de) | 2001-12-03 | 2002-11-29 | Verfahren und Gerät zur Bestimmung der durch ein Formiersieb einer Faserstoffsuspension entnommenen Fasermenge |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1316645B1 (de) |
AT (1) | ATE309410T1 (de) |
DE (2) | DE10159172A1 (de) |
-
2001
- 2001-12-03 DE DE10159172A patent/DE10159172A1/de not_active Withdrawn
-
2002
- 2002-11-29 DE DE50204842T patent/DE50204842D1/de not_active Expired - Fee Related
- 2002-11-29 EP EP02026637A patent/EP1316645B1/de not_active Expired - Lifetime
- 2002-11-29 AT AT02026637T patent/ATE309410T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
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No relevant documents disclosed * |
Also Published As
Publication number | Publication date |
---|---|
EP1316645B1 (de) | 2005-11-09 |
DE10159172A1 (de) | 2003-06-18 |
ATE309410T1 (de) | 2005-11-15 |
DE50204842D1 (de) | 2005-12-15 |
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