EP2811068A1 - Verfahren und Anordnung zum Entgasen einer Behandlungssubstanz einer Faserbahn - Google Patents
Verfahren und Anordnung zum Entgasen einer Behandlungssubstanz einer Faserbahn Download PDFInfo
- Publication number
- EP2811068A1 EP2811068A1 EP13170730.9A EP13170730A EP2811068A1 EP 2811068 A1 EP2811068 A1 EP 2811068A1 EP 13170730 A EP13170730 A EP 13170730A EP 2811068 A1 EP2811068 A1 EP 2811068A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- treatment substance
- degassing
- temperature
- control unit
- substance
- 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
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
- D21H23/48—Curtain coaters
Definitions
- the invention relates to a method and to an arrangement for degassing treatment substance, especially for degassing a coating color or a sizing agent, of a fiber web. More especially the invention relates to a method according to the preamble of claim 1 and to an arrangement according to the preamble of claim 8.
- a typical production and treatment line comprises a head box, a wire section and a press section as well as a subsequent drying section and a reel-up.
- the production and treatment line can further comprise other devices and sections for finishing the fiber web, for example, a sizer, a calender, a coating section.
- the production and treatment line also comprises at least one winder for forming customer rolls as well as a roll packaging apparatus.
- fiber webs are meant for example paper and board webs.
- Sizing is used to alter the properties of a fiber web by adding sizing agents (sizing medium), for example glue chemicals onto the surface of the fiber web at the fiber web machine.
- sizing agent for example glue chemicals
- coating onto surface of a fiber web is added a layer or layers of coating color (coating medium) at a coating station followed by drying.
- the coating or the sizing of a fiber web typically utilizes a coating device - a coater - or a sizing device - a sizer.
- a coating device - a coater - or a sizing device - a sizer In connection with the coaters and sizers different kinds of application technology for application of the coating medium or the sizing medium on the fiber web are employed, for example curtain technology or blade coating technology or film transfer technology or rod coating technology or air brush coating technology or spray coating technology.
- the mixing of gases, such as air, with the liquids and compounds used in the process typically causes many problems.
- gases such as air
- the gas and gas bubbles in the treatment substance cause unevenness on the surface of the web.
- the seriousness of the problems varies for example due to their different tendency to bind with gases.
- the significance of the problem depends also on the coating or sizing technology used.
- the coating substance is arranged to rise stepwise up the wall of the drum, so that the coating substance will form a thin veil-like film on at least two different step levels, whereupon the gas bubbles in the coating substance will break and discharge.
- the inner surface of the drum is designed to be stepped, comprising at least two step levels so that the coating substance rising upwards due to the effect of the rotating motion will form a thin veil-like film on the said at least two step levels, respectively.
- EP publication 0517223 A1 is disclosed manufacturing of a coated paper to be used for a usual printing and using a curtain type coating method, in which is enabled by de-aerating a coating substance having a high concentration and a high viscosity is de-aerated under a degree of vacuum of a saturated vapor pressure or less and under a condition of applying shear to the coating substance, which is formed as a free-falling curtain in a vertical direction and a printing base paper is coated with the de-aerated coating liquid so that the free-falling curtain of the coating substance collides with the coating base paper running continuously in a direction crossing the free-falling curtain.
- DE 102005017952 is disclosed a method for degassing a coating substance, which substance is passed through a vacuum degassing unit at a temperature close to its boiling point and especially 40-60 °C under a pressure of 20-100 mbar for degassing the treatment substance in temperatures near boiling temperature.
- Heat is supplied by a heat exchanger or heated walls of the vacuum degasser.
- One disadvantage of this known method is that heating of the coating substance increases solubility of gases into the substance liquid and increases amount of steam that must be removed by the vacuum degassing unit from the system and therefore more powerful and bigger unit is needed and the energy consumption is increased.
- heating of the treatment substance might, for example due to chemical reactions initiated by the heat or due to non-tolerance of heat of some components of the treatment substance, deteriorate properties required from treatment substance.
- thermal coatings will lose brightness already at temperatures 50 °C and some latex coatings will suffer instability in temperatures over 45°C in longer run.
- the heating of the treatment substance which typically is already in rather, even too high temperatures, for example 40 - 50 °C, when passed to the degassing, creates more steam into the substance.
- a suction pump of the degassing unit from the treatment substance, which might in some cases be problematic since some suction pump types, for example dry screw vacuum pumps, which are operable in vacuums over 22 mbar, and liquid ring vacuum pumps, which are operable in vacuums over 35 mbar, do not function well when steam is present.
- An object of the invention is to create a method and an arrangement for degassing treatment substance of a fiber web in which the above problems and disadvantages are eliminated or at least minimized.
- Another object of the invention is to provide a method and an arrangement for degassing treatment substance of a fiber web in which high temperatures of the treatment substance are avoided.
- a particular object is to prevent harmful chemical reactions in treatment substance during degassing.
- a further particular object is to provide a method and an arrangement for degassing treatment substance of a fiber web in which the temperature of the treatment substance is controlled during degassing.
- a further particular object is to provide a method and an arrangement for degassing treatment substance of a fiber web in which the suction pump type of the degassing unit choice is not limited by steam tolerance.
- the method for degassing treatment substance of a fiber web according to the invention is mainly characterized by the features of claim 1 and the arrangement for degassing treatment substance of a fiber web according to the invention is mainly characterized by the features of claim 8.
- the treatment substance in particular a coating color or a sizing agent, of a fiber web the treatment substance is degassed in a degassing unit and temperature of the treatment substance is adjusted to temperature below 35 °C by cooling the treatment substance in a temperature control unit before degassing of the treatment substance in the degassing unit.
- the arrangement for degassing treatment substance of a fiber web comprises a degassing unit and a temperature control unit, advantageously a cooler or a heat exchanger, before the degassing unit for adjusting temperature of the treatment substance to temperature below 35 °C before degassing.
- temperature changes of the treatment substance are evened out in the temperature control unit before degassing of the treatment substance in the degassing unit.
- the temperature control unit maintains the temperature changes of the treatments substance slow, for example about 1°C/15 min.
- the treatment substance is cooled to temperatures 20-30 °C before degassing.
- the temperature of the treatment substance in particular the temperature of a coating or a sizing substance, is controlled before degassing the substance in the degassing unit by cooling the substance by a cooler, for example by a heat exchanger.
- the cooler advantageously maintains the temperature changes of the treatments substance as slow as possible by which best environment and best conditions for degassing and for functions of the degassing unit and the vacuum system are provided. Thus improved degassing effect is achieved.
- the temperature of the treatment substance is controlled by a heat exchanger, advantageously by a cooler.
- the arrangement comprises a droplet separator between the degassing unit and the vacuum system.
- the arrangement comprises a dry screw vacuum pump for providing vacuum 20 - 40 mbar in the vacuum system.
- a droplet separator before the dry screw vacuum pump.
- the process of treatment substance flow the treatment substance is delivered to a feed tank 11.
- temperature control unit 12 which is for example a heat exchanger or advantageously a cooler.
- the temperature controlled, advantageously cooled treatment substance is then passed to degassing unit 13, which comprises a vacuum system 14 with a suction pump (not shown) for removing gas from the treatment substance.
- degassing unit 13 which comprises a vacuum system 14 with a suction pump (not shown) for removing gas from the treatment substance.
- the degassed treatment substance is the passed to a working tank 15, from which the treatment substance is passed to a coating device or to a sizing device (not shown).
- the degassed treatment substance may also be passed directly to a coating head / an applicator of a coating device or to a sizing head / an applicator of a sizing device (not shown).
- treatment substance is delivered via feed channel 20 to the temperature control unit 12 from the feed tank 11 ( fig. 1 ). Temperature of the treatment substance is measured by a temperature sensor 12A and pressure of the treatment substance in the feed channel 20 is measured by a pressure sensor 20A. Measurement information from the temperature sensor 12A and the pressure sensor 20A is transmitted to a control unit 25. From the temperature control unit 12 the treatment substance is passed to degassing unit 13, in which the gas is separated from the treatment substance and removed by the vacuum system 14. The gas flow is passed to the vacuum system via a droplet separator 16, in which the steam in the substance is cooled to condensate and moisture is separated from the gas flow.
- Pressure in the degassing unit 13 is measured by a pressure sensor 13A and its measurement information is transmitted to the control unit 25.
- the control unit 25 controls operation of the system and especially controls the pressure created by the vacuum system and temperature conditions of the treatment system by adjusting the operation of the temperature control unit 12.
- From the degassing unit the degassed treatment substance is fed via a feed channel 22 to the working tank 15 ( fig. 1 ).
- the degassed treatment substance may also be passed directly to a coating head / an applicator of a coating device or to a sizing head / an applicator of a sizing device (not shown).
- Temperature control unit 12 is advantageously a cooler or a heat exchanger, which maintains the temperature changes of the treatments substance as slow as possible and thus best environment and best conditions for degassing and for functions of the degassing unit 13 and the vacuum system 14 are provided.
- FIG 3 is an air-saturation vapor pressure diagram, which provides basic information for the control unit 25 ( fig. 2 ) for creating required pressure level in view of the temperature of the treatment substance for desired degassing conditions.
- the control unit 25 fig. 2
- a vacuum is created as the steam volume in the gas flow decreases due to cooling and condensing of the steam.
- the steam condensate is removed in the droplet separator 16.
Landscapes
- Coating Apparatus (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13170730.9A EP2811068B1 (de) | 2013-06-06 | 2013-06-06 | Verfahren und Anordnung zum Entgasen einer Behandlungssubstanz einer Faserbahn |
| CN201420296160.0U CN204059096U (zh) | 2013-06-06 | 2014-06-05 | 对纤维幅材的处理物质进行除气的设备 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13170730.9A EP2811068B1 (de) | 2013-06-06 | 2013-06-06 | Verfahren und Anordnung zum Entgasen einer Behandlungssubstanz einer Faserbahn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2811068A1 true EP2811068A1 (de) | 2014-12-10 |
| EP2811068B1 EP2811068B1 (de) | 2019-05-08 |
Family
ID=48576295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13170730.9A Active EP2811068B1 (de) | 2013-06-06 | 2013-06-06 | Verfahren und Anordnung zum Entgasen einer Behandlungssubstanz einer Faserbahn |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2811068B1 (de) |
| CN (1) | CN204059096U (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20185867A1 (fi) * | 2018-10-15 | 2020-04-16 | Valmet Technologies Oy | Menetelmä monikerrosrainan liimaamiseksi ja muodostusosa monikerrosrainaa varten |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1246806A (en) * | 1967-09-06 | 1971-09-22 | Burlington Industries Inc | Process and apparatus for treating textile materials |
| EP0517223A1 (de) * | 1991-06-07 | 1992-12-09 | Nippon Paper Industries Co., Ltd. | Verfahren zur Herstellung von Streichdruckpapier |
| WO1997010387A1 (en) * | 1995-09-11 | 1997-03-20 | Hercules Incorporated | Paper sizing polymeric enhancer, compositions, sized paper and method of use |
| JP2001087698A (ja) * | 1999-09-22 | 2001-04-03 | Ishikawajima Harima Heavy Ind Co Ltd | カーテンコータ用カラー脱泡装置 |
| WO2002066739A1 (de) * | 2001-02-16 | 2002-08-29 | Voith Paper Patent Gmbh | Streichfarbe und verfahren zur herstellung von gestrichenem papier oder karton |
| EP1498544A1 (de) * | 2003-07-16 | 2005-01-19 | Air Products Polymers, L.P. | Polymere Emulsionsüberzugsschichten für Cellulosesubstrate mit verbesserten Sperreigenschaften |
| EP1518962A2 (de) * | 2003-09-16 | 2005-03-30 | Voith Paper Patent GmbH | Vorrichtung zur Streichfarbenaufbereitung |
| WO2008037843A1 (en) * | 2006-09-29 | 2008-04-03 | Metso Paper, Inc. | Method of coating a fibrous web with a curtain coater |
| WO2012041662A1 (de) * | 2010-09-30 | 2012-04-05 | Voith Patent Gmbh | Verfahren zum betreiben einer vorrichtung zum direkten oder indirekten auftrag von flüssigem oder pastösem auftragsmedium und vorrichtung |
| EP2474369A1 (de) * | 2009-08-31 | 2012-07-11 | Voith Patent GmbH | Vorhangbeschichtungsvorrichtung und vorhangbeschichtungsverfahren |
-
2013
- 2013-06-06 EP EP13170730.9A patent/EP2811068B1/de active Active
-
2014
- 2014-06-05 CN CN201420296160.0U patent/CN204059096U/zh not_active Expired - Lifetime
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1246806A (en) * | 1967-09-06 | 1971-09-22 | Burlington Industries Inc | Process and apparatus for treating textile materials |
| EP0517223A1 (de) * | 1991-06-07 | 1992-12-09 | Nippon Paper Industries Co., Ltd. | Verfahren zur Herstellung von Streichdruckpapier |
| WO1997010387A1 (en) * | 1995-09-11 | 1997-03-20 | Hercules Incorporated | Paper sizing polymeric enhancer, compositions, sized paper and method of use |
| JP2001087698A (ja) * | 1999-09-22 | 2001-04-03 | Ishikawajima Harima Heavy Ind Co Ltd | カーテンコータ用カラー脱泡装置 |
| WO2002066739A1 (de) * | 2001-02-16 | 2002-08-29 | Voith Paper Patent Gmbh | Streichfarbe und verfahren zur herstellung von gestrichenem papier oder karton |
| EP1498544A1 (de) * | 2003-07-16 | 2005-01-19 | Air Products Polymers, L.P. | Polymere Emulsionsüberzugsschichten für Cellulosesubstrate mit verbesserten Sperreigenschaften |
| EP1518962A2 (de) * | 2003-09-16 | 2005-03-30 | Voith Paper Patent GmbH | Vorrichtung zur Streichfarbenaufbereitung |
| WO2008037843A1 (en) * | 2006-09-29 | 2008-04-03 | Metso Paper, Inc. | Method of coating a fibrous web with a curtain coater |
| EP2474369A1 (de) * | 2009-08-31 | 2012-07-11 | Voith Patent GmbH | Vorhangbeschichtungsvorrichtung und vorhangbeschichtungsverfahren |
| WO2012041662A1 (de) * | 2010-09-30 | 2012-04-05 | Voith Patent Gmbh | Verfahren zum betreiben einer vorrichtung zum direkten oder indirekten auftrag von flüssigem oder pastösem auftragsmedium und vorrichtung |
Non-Patent Citations (1)
| Title |
|---|
| DATABASE WPI Week 200133, Derwent World Patents Index; AN 2001-314591, XP002714688 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN204059096U (zh) | 2014-12-31 |
| EP2811068B1 (de) | 2019-05-08 |
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