EP3850151A1 - Formierpartie und betriebsverfahren - Google Patents
Formierpartie und betriebsverfahrenInfo
- Publication number
- EP3850151A1 EP3850151A1 EP19742187.8A EP19742187A EP3850151A1 EP 3850151 A1 EP3850151 A1 EP 3850151A1 EP 19742187 A EP19742187 A EP 19742187A EP 3850151 A1 EP3850151 A1 EP 3850151A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- forming section
- friction
- covering
- coefficient
- bar
- 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- Withdrawn
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
- D21F1/52—Suction boxes without rolls
-
- 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
- D21G9/0027—Paper-making control systems controlling the forming section
Definitions
- the invention relates to a forming section of a machine for producing a fibrous web, a method for operating a forming section and a computer program product.
- the forming section is a central component of a paper machine.
- a fiber suspension is usually placed on one fabric or between two fabrics.
- suction elements such as Suction boxes or suction rollers are removed from the water suspension.
- a forming section of a machine for producing a fibrous web comprising at least a first covering and at least one suction box, the suction box comprising a suction zone and a first bar which is in frictional contact with the first covering.
- the forming section has means for determining a coefficient of friction for the friction of the first covering and the first bar.
- This friction is not known from the outset, as it is influenced by a large number of factors. These are, for example, the structure of the covering, the wear condition of the covering, the material pairing covering / strip, or the stability and thickness of the lubricating film that forms between the strip and Covering.
- the tribological conditions are very complex and cannot be predicted sufficiently by theoretical considerations.
- the invention therefore provides means for determining the friction currently acting in the operation of the forming section in the form of a characteristic value. Knowledge of this coefficient of friction enables the operator to take countermeasures that reduce friction and thus reduce both the required drive power and the wear on the fabric.
- the forming section has a control unit which is set up to change an actuator, such as in particular the vacuum of the suction zone, as a function of the determined coefficient of friction. Automatic control of the forming section is possible by means of such a control unit.
- a forming section will have several suction boxes, as well as several strips and suction zones.
- means can advantageously be provided to determine friction characteristics for the friction of the first covering with a plurality of strips, in particular for all strips.
- the means can comprise force sensors in order to determine the tensile force exerted by the first covering on the first bar. Due to an increased friction between the covering and the last, an increased force is also exerted on the last.
- the measurement can be carried out, for example, by measuring the torque or the displacement of the bar, in particular by means of strain gauges.
- the forming section can be a gap former or a so-called hybrid former.
- the first covering and any further covering can be a fabric or a perforated film, or the covering can include these elements.
- the vacuum in step iii) does not necessarily have to take place in a suction zone which is directly adjacent to the first bar.
- a high coefficient of friction is determined in the rear part of the forming section to reduce a vacuum in the front part of the forming section. As a result, more water gets into the rear part of the forming section, which leads to improved lubrication of the bar and thus to a reduction in friction.
- the vacuum in the rear part of the forming section can be increased in order to still ensure a sufficient total drainage of the wire section.
- provision can be made for a temperature measurement, in particular on the first bar or in a process water, to determine the coefficient of friction.
- it can be provided that the force that exerts the first covering on the first strip is measured to determine the coefficient of friction.
- measurements can also be carried out on several strips or on several process water flows.
- the regulation or control of a forming section is usually carried out with the aid of a processing device.
- the computer of this processing device often also has access to further operating parameters of the paper machine or also quality parameters of the paper produced. These parameters can also be included in the calculation of the coefficient of friction.
- the invention also relates to a computer program product with program code means for carrying out a method according to one aspect of the invention, the computer program product being executed on a processing device or being stored on a computer-readable data carrier.
- FIG. 1 shows schematically a section of a forming section according to one aspect of the invention
- the forming section of a machine for producing a fibrous web shown in FIG. 1 represents a gap former.
- This comprises a first covering 10 and a second covering 20, which are usually fabrics 10, 20.
- An aqueous fiber suspension is introduced from the headbox nozzle 30 between the coverings 10, 20.
- the suspension in the sandwich between the two fabrics 10, 20 is transported between the forming roller 32 and the screen suction roller 31. Thereafter, the fibrous web which has already been formed then continues to run with the first covering 10 and is then usually transferred to a press area which is not shown in FIG. 1.
- the forming section in FIG. 1 can now have one or more means for determining a coefficient of friction.
- a temperature sensor 4 which can be provided in or on one or more of the strips 2c, is shown as an example in the so-called “Hi-Vac suction box” 1c.
- a plurality of sensors 4 will be provided in a bar in order to have redundancy in the event that one sensor fails or in order to be able to check the measured values for plausibility.
- the first suction box 1 a shows the possibility of providing a temperature sensor 5 in or on the discharge line 3 of the white water, and to use these knife values to determine a coefficient of friction.
- the third suction box 1b shows that different sensors 4, 5 can also be combined to determine the coefficient of friction.
- temperature sensors 4, 5 are provided both in a strip 2 b and in the discharge line 3. It should be noted that the invention is not specific to this Sensor configuration limited, but only the multitude of possible arrangements should be shown here.
- control unit also uses further values.
- the specified target value for the coefficient of friction or the strength of the reduction in vacuum depends on process parameters such as the production speed or the type of paper produced.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018122498.2A DE102018122498A1 (de) | 2018-09-14 | 2018-09-14 | Formierpartie und Betriebsverfahren |
| PCT/EP2019/069229 WO2020052833A1 (de) | 2018-09-14 | 2019-07-17 | Formierpartie und betriebsverfahren |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3850151A1 true EP3850151A1 (de) | 2021-07-21 |
Family
ID=67383771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19742187.8A Withdrawn EP3850151A1 (de) | 2018-09-14 | 2019-07-17 | Formierpartie und betriebsverfahren |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3850151A1 (de) |
| DE (1) | DE102018122498A1 (de) |
| WO (1) | WO2020052833A1 (de) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3128866A1 (de) * | 1981-07-22 | 1983-02-10 | Feldmühle AG, 4000 Düsseldorf | Papiermaschine |
| DE10163575A1 (de) * | 2001-12-21 | 2003-07-03 | Voith Paper Patent Gmbh | Maschine zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension |
| FI20012175A7 (fi) * | 2001-11-09 | 2003-05-10 | Metso Paper Automation Oy | Menetelmä ja laitteisto viiraosan toiminnan säätämiseksi |
| AT411536B (de) * | 2002-07-18 | 2004-02-25 | Bartelmuss Klaus Ing | Anlage zur erzeugung eines papierbandes mit mindestens einem über trag- bzw. führungswalzen bewegten, in sich geschlossenen siebband |
-
2018
- 2018-09-14 DE DE102018122498.2A patent/DE102018122498A1/de active Pending
-
2019
- 2019-07-17 WO PCT/EP2019/069229 patent/WO2020052833A1/de not_active Ceased
- 2019-07-17 EP EP19742187.8A patent/EP3850151A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020052833A1 (de) | 2020-03-19 |
| DE102018122498A1 (de) | 2020-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3131799C2 (de) | Walzenpresse für Papier- und ähnliche Bahnen, insbesondere Kalander | |
| DE3851340T2 (de) | Verfahren und Vorrichtung zur Steuerung der Druckverteilung auf einer Materialbahn. | |
| EP2981647B1 (de) | Filmpresse | |
| DE69223176T2 (de) | System zur Überwachung und Regelung des Laufs der Pressenfilze in einer Presspartie einer Papiermaschine | |
| AT413111B (de) | Verfahren und anordnung in verbindung mit einer papiermaschine oder einer vorrichtung zur weiterverarbeitung einer papierbahn | |
| DE19733454A1 (de) | Verfahren und Vorrichtung zur Erkennung und Korretur einer Faserorientierungs-Querprofil-Veränderung | |
| DE112017001022T5 (de) | Verfahren, system und computerprogrammprodukt für eine zustandsüberwachung eines durchgängigen elements, das sich in einer faserstoffbahn- oder papierveredelungsmaschine bewegt | |
| EP2313552A1 (de) | Verfahren zur optimierung der energiebilanz in formiereinheiten in maschinen zur herstellung von faserstoffbahnen und formiereinheit | |
| EP1260633A2 (de) | Maschine zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension sowie Verfahren und System zur Überwachung eines Entwässerungselements | |
| DE10218509A1 (de) | Verfahren zur Herstellung einer Tissuebahn | |
| WO2020052833A1 (de) | Formierpartie und betriebsverfahren | |
| EP1693509A1 (de) | Presswalzenüberwachung | |
| EP1640497A2 (de) | Einrichtung und Verfahren zur Überwachung des Überführens einer Materialbahn, insbesondere während der Verbreiterung eines Überführstreifens der Materialbahn, auf einen Abriss der Materialbahn | |
| WO2016071262A1 (de) | Bespannung mit indikatorlage | |
| DE102008015371B4 (de) | Profilregulierung für einen Kalander | |
| DE102021123077A1 (de) | Verfahren und Vorrichtung zur Verbesserung des Trocknungsprozesses in einer Papiermaschine | |
| DE19705030A1 (de) | Vorrichtung und Verfahren zur Entwässerung einer Materialbahn | |
| EP3693509B1 (de) | Formierpartie für eine maschine zur herstellung einer mehrlagigen faserstoffbahn und verfahren zur herstellung einer mehrlagigen faserstoffbahn | |
| DE102024137591B3 (de) | Siebeinheit einer Siebpartie einer Maschine zur Herstellung einer Faserstoffbahn | |
| EP1348804B1 (de) | Maschine zur Herstellung einer Tissuebahn mit einer Schuhpresse | |
| DE112011101989T5 (de) | Vorrichtung zum Glätten von Papieroberflächen für Papiermaschine | |
| EP1780332A1 (de) | Vorrichtung und Verfahren zum Behandeln einer Faserstoffbahn, insbesondere einer Karton- oder Papierbahn | |
| EP1342838A1 (de) | Maschine zur Herstellung einer Tissuebahn | |
| DE102019130598A1 (de) | Verschleißsieb für Hochvakuumkästen | |
| DE102025000203A1 (de) | Verfahren zum Betrieb einer Presseinheit in einer Maschine zur Herstellung einer Faserstoffbahn |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20210414 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
| 17Q | First examination report despatched |
Effective date: 20250408 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20250611 |