WO2004007836A1 - A method for controlling the properties of a surface - Google Patents
A method for controlling the properties of a surface Download PDFInfo
- Publication number
- WO2004007836A1 WO2004007836A1 PCT/FI2003/000569 FI0300569W WO2004007836A1 WO 2004007836 A1 WO2004007836 A1 WO 2004007836A1 FI 0300569 W FI0300569 W FI 0300569W WO 2004007836 A1 WO2004007836 A1 WO 2004007836A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotating member
- web
- roll
- light
- contact
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 24
- 230000004913 activation Effects 0.000 claims abstract description 10
- 239000011149 active material Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 7
- 230000003213 activating effect Effects 0.000 claims abstract description 5
- 230000003647 oxidation Effects 0.000 claims abstract description 4
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 4
- 239000000123 paper Substances 0.000 claims description 17
- 239000011087 paperboard Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000000109 continuous material Substances 0.000 claims description 4
- 230000001699 photocatalysis Effects 0.000 description 24
- 239000011248 coating agent Substances 0.000 description 18
- 238000000576 coating method Methods 0.000 description 18
- 230000005855 radiation Effects 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- -1 fibres Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000012072 active phase Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/08—Pressure rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
Definitions
- the invention relates to a method according to the appended claim 1 for adjusting the properties of a surface.
- peripheral surfaces of rotating members that control the travel of a continuous material web are typically susceptible for accumulation of various substances, which may result from the composition of the material web or the process.
- the surface of a member that is in contact with a continuous material web, especially the roll surface of a paper machine is coated by means of a photocatalytically active coating and the surface of the member is illuminated with a suitable source of UV radiation.
- Photocatalysis is a phenomenon in which chemical reactions take place on the surface of the material as a result of the influence of light. Titanium dioxide is one such photocatalytic material that is used as a thin transparent coating for example in cleansing of glass surfaces in building and automotive industry.
- the surface energy can be adjusted between hydrophilic and hydrophobic, for example the hydrophilicity of the surface can be increased, wherein the release of the paper web under the influence of draw will be facilitated.
- Fig. 1 shows an embodiment of the invention, a press section, in a side view
- Fig. 2 shows a front view of the arrangement of Fig. 1 at the location of the roll
- Fig. 3 shows another embodiment of the method.
- Fig. 1 shows the press section of a paper or paperboard machine, in which a press felt 1 is utilized to bring a moist paper or paperboard web W on a central roll 3 of the press via a first press nip P.
- the web W travels on the periphery of the rotating central roll 3 to a second press nip P that is formed between a guiding roll 2 and a second press felt 1 and the central roll 3.
- On the central roll 3 the web travels a certain distance on the surface of the roll after the nip P, whereafter it is released at point K and transferred in a free draw to a second guiding roll 4.
- the peripheral surface of the central roll 3, which is in contact with the web W within a sector of certain length, contains photocatalytically active material.
- the surface of the roll can be equipped with this material.
- a light source 5 that exerts electromagnetic radiation at a suitable wavelength on the peripheral surface of the roll 3 to accomplish the photocatalytic activation of the coating thereon.
- the release point K of the web W in the direction of rotation of the roll 3 and before the area of influence of the light source 5, there is one or several doctor blades 6 for cleaning the surface of the roll.
- the light source activates the surface of the roll in such a manner that its hydrophilicity increases. This produces a thin water film on the surface of the roll, said moisture film facilitating the release of the paper web from the surface.
- the release angle from the roll 3 (angle ⁇ ) and the location of the release point after the press nip P can be adjusted by adjusting the activating effect of the light source 5.
- the location of the release point and the release angle ⁇ are variables depending from each other, i.e. when the release point moves closer to the press nip P, the web is directed more in parallel with the tangent of the central roll 3, and the release angle ⁇ is reduced.
- the aim is to attain as small a release angle as possible, i.e. such a situation where the web leaves the roll 3 as tangentially as possible with respect to its periphery.
- the release point K can be located close to the nip P, and the release angle ⁇ can be small, because the light source 5 makes the web to detach easily from the roll.
- the coating can be activated by means of the light source, in the presented case with a source of UV radiation, before the web is introduced, and during the use, when the web is running and the roll is rotating, the UV radiation is exerted on the peripheral surface of the roll 3.
- the light source 5 is moved back and forth at a suitable speed in the longitudinal direction of the roll, i.e. parallelly to the rotation axis of the roll in the manner shown in Fig. 2, but it is at all times located within a certain sector of the rotating movement of the roll.
- the photocatalytic activation of the surface of the roll takes place during the rotation of the roll, when the surface of the roll moves past the light source.
- the light source moves in the longitudinal direction of the roll, it does not have to cover the entire length of the roll at one time.
- the intensity or wavelength of the radiation source is adjusted, it is possible to affect the intensity or energy level of the UV radiation meeting the roll surface.
- a suitable laser source is used for producing UV radiation, it is also possible to produce narrow "hydrophilic bands" (Fig. 2) on the sur ace of the roll that extend approximately in the direction of the periphery, or "hydrophilic spots" when a pulse-like light source, for example a laser is used.
- the radiation is exerted on a free surface of the roll, i.e. on such a sector that is not covered by the paper web, wherein the paper web is not positioned between the source of radiation and the roll surface.
- the roll rotates at creeping speed, for example after a web break.
- the light source can be switched off.
- the activation can thus be conducted at fixed intervals on the roll installed in the machine, and it does not have to be conducted during the production run.
- the roll does not have to be in contact with the web either, but the web may be absent (for example due to a web break).
- the term "rotating member that is in contact with a continuous moving material web” thus refers to such a member that can be detached from the material web for some time, wherein it can be maintained, for example to adjust the properties of the surface in the above-described manner in particular.
- the material web can be brought in contact with the surface of the member, and the material web can thus travel via the surface of the rotating member within a certain sector.
- This alternative is shown in Fig. 3, in which on the left-hand side the roll 3 is activated as it rolls at a lower speed v1 without the material web, and on the right-hand side the roll 3 rotates at a higher speed v2 in contact with the web W.
- a photocatalytic coating especially titanium dioxide and coating solutions based thereon can be employed.
- the coating used especially in the central roll of the press section of the paper machine it is also possible to adjust the surface energy of the surface of the roll between hydrophobic and hydrophilic even during the run.
- the photocatalytic coating is sufficiently wear-resistant, and/or the topography of the surface protects the coating from wear.
- the thermally sprayed coating used especially in the central rolls offers such a protective microporosity for example against the wearing effect of mechanical cleaning means, such as doctor blades.
- the photocatalytic surface is protected only at the bottom of the pores, but it is, however, exposed to the activating light directed on the surface of the roll. By controlling the extent of porosity it is thus possible to affect the effective photocatalytic surface area.
- the photocatalytic surface can be produced by thermal spraying or by treating the thermally sprayed surface with a photocatalytic coating.
- the material producing the photocatalysis can be in particle form, and thus bound to an organic, advantageously UV-stabilized matrix or inorganic matrix, or it can be a continuous film that is produced for example by means of sol-gel technique. In the latter case the film is produced either on a finished roll surface or immediately before the finish grinding. In the latter case the photocatalytic film is only located in the pores of the thermally sprayed or otherwise manufactured ceramic surface of the central roll, the amount and surface area of said pores thus determining the portion of the possible photocatalytic surface area.
- said photocatalytic surface is also suitable for keeping the surface clean.
- the photocatalytic surface is activated by the action of UV light, and it constantly oxidizes the organic impurities, such as fibres, resin and other pastes adhering on the surface, and originating for example from the paper or paperboard web travelling constantly on top of said surface. The adhered impurities are thereafter easily released, and harmful, thick layers are thus not formed.
- the reactions produced by UV light on a photocatalytically active surface include:
- the photocatalytic coating can be single-phased, or it may contain photocatalytically active phases or particles.
- the matrix coating can be a thermally sprayed polymer coating, a polymer coating manufactured by the sol-gel method, or another polymer coating.
- the surrounding matrix must be protected with protective UV agents, or the photocatalytic particles are coated with a protective film that is ground off after the manufacture of the surface.
- the UV-active part does not affect the matrix to such an extent that it would oxidize the polymer.
- the invention is not restricted solely to a particular photocatalytic material, but in the method it is possible to utilize any photocatalytic material in the structure of the surface, wherein light having a suitable energy level and exerted on the material causes changes in the properties of the surface.
- the photocatalytic material is Ti0 2 , its crystal structure is advantageously anastatic, which has the highest photocatalytic activity.
- the invention is not restricted solely to UV light, but it is only necessary that the light directed actively to the surface has a sufficient energy level to produce the desired phenomena in the photocatalytically active material.
- the term material web refers to all material webs travelling over the peripheral surface of a rotating member, the release of which material webs from the peripheral surface can be affected for example by activating the aforementioned surface photocatalytically.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Plasma & Fusion (AREA)
- Toxicology (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Catalysts (AREA)
- Paper (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Silicon Compounds (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Automatic Control Of Machine Tools (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03763915A EP1546452B1 (en) | 2002-07-16 | 2003-07-16 | A method for controlling the properties of a surface |
AU2003246749A AU2003246749A1 (en) | 2002-07-16 | 2003-07-16 | A method for controlling the properties of a surface |
DE60312709T DE60312709T2 (en) | 2002-07-16 | 2003-07-16 | METHOD FOR TARGETING THE CHARACTERISTICS OF A SURFACE |
CA002492585A CA2492585A1 (en) | 2002-07-16 | 2003-07-16 | A method for controlling the properties of a surface |
JP2004520705A JP4209389B2 (en) | 2002-07-16 | 2003-07-16 | Method for controlling surface properties |
US10/521,330 US20050236128A1 (en) | 2002-07-16 | 2003-07-16 | Method for controlling the properties of a surface |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20021390 | 2002-07-16 | ||
FI20021390A FI116389B (en) | 2002-07-16 | 2002-07-16 | Procedure for adjusting surface properties |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004007836A1 true WO2004007836A1 (en) | 2004-01-22 |
Family
ID=8564363
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2003/000569 WO2004007836A1 (en) | 2002-07-16 | 2003-07-16 | A method for controlling the properties of a surface |
Country Status (11)
Country | Link |
---|---|
US (1) | US20050236128A1 (en) |
EP (1) | EP1546452B1 (en) |
JP (1) | JP4209389B2 (en) |
KR (1) | KR20050036952A (en) |
CN (1) | CN1329585C (en) |
AT (1) | ATE357557T1 (en) |
AU (1) | AU2003246749A1 (en) |
CA (1) | CA2492585A1 (en) |
DE (1) | DE60312709T2 (en) |
FI (1) | FI116389B (en) |
WO (1) | WO2004007836A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009125057A1 (en) * | 2008-04-09 | 2009-10-15 | Metso Paper, Inc. | Method of working the surface of a machine element of a fiber web machine and a machine element of a fiber web machine |
DE102018120559A1 (en) * | 2018-08-23 | 2019-07-04 | Voith Patent Gmbh | Method for processing a roll cover |
DE102018120558A1 (en) * | 2018-08-23 | 2019-08-14 | Voith Patent Gmbh | Process for processing a press jacket |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10316240A1 (en) * | 2003-04-09 | 2004-11-04 | Maschinenfabrik Wifag | Roller for a printing machine and method for producing a roller |
FI119441B (en) * | 2007-08-20 | 2008-11-14 | Runtech Systems Oy | Method for compensating deformation of a paper web |
DE102015218673B4 (en) | 2015-09-29 | 2017-06-01 | Voith Patent Gmbh | Method for operating a commissioned work |
DE102015218672B4 (en) | 2015-09-29 | 2017-06-01 | Voith Patent Gmbh | Commissioned work and method for operating such |
CN110804894B (en) * | 2019-11-14 | 2021-01-08 | 江苏理文造纸有限公司 | Paper pulp dewatering equipment |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0816466A1 (en) * | 1995-03-20 | 1998-01-07 | Toto Ltd. | Method of photocatalytically making the surface of base material ultrahydrophilic, base material having ultrahydrophilic and photocatalytic surface, and process for producing said material |
EP0853142A1 (en) * | 1997-01-14 | 1998-07-15 | Takenaka Corporation | Metal material having photocatalytic activity and method of manufacturing the same |
WO1998041482A1 (en) * | 1997-03-14 | 1998-09-24 | Ppg Industries Ohio, Inc. | Photocatalytically-activated self-cleaning appliances |
EP0869156A1 (en) * | 1995-12-22 | 1998-10-07 | Toto Ltd. | Photocatalytic process for making surface hydrophilic and composite material having photocatalytically hydrophilic surface |
EP0980709A1 (en) * | 1998-08-18 | 2000-02-23 | Fuji Kihan Co., Ltd. | Photocatalyst coated products and a method for producing a photocatalyst layer |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI90098C (en) * | 1992-04-14 | 1993-12-27 | Valmet Paper Machinery Inc | FOERFARANDE VID BELAEGGNINGEN AV EN MITTVALS I PRESSEN AV EN PAPPERSMASKIN OCH MITTVALS FOER EN PRESS I EN PAPPERSMASKIN |
US6391158B1 (en) * | 2000-06-30 | 2002-05-21 | Westvaco Corporation | Method for loose draw detection in a paper machine wet press |
DE10115435B8 (en) * | 2001-03-29 | 2007-02-08 | Maschinenfabrik Wifag | Method for producing a printed image and / or deleting a printed image of a wet offset printing form with photothermally changeable material |
-
2002
- 2002-07-16 FI FI20021390A patent/FI116389B/en active IP Right Grant
-
2003
- 2003-07-16 EP EP03763915A patent/EP1546452B1/en not_active Expired - Lifetime
- 2003-07-16 US US10/521,330 patent/US20050236128A1/en not_active Abandoned
- 2003-07-16 AT AT03763915T patent/ATE357557T1/en not_active IP Right Cessation
- 2003-07-16 KR KR1020057000724A patent/KR20050036952A/en not_active Application Discontinuation
- 2003-07-16 WO PCT/FI2003/000569 patent/WO2004007836A1/en active IP Right Grant
- 2003-07-16 CN CNB038167344A patent/CN1329585C/en not_active Expired - Fee Related
- 2003-07-16 DE DE60312709T patent/DE60312709T2/en not_active Expired - Fee Related
- 2003-07-16 AU AU2003246749A patent/AU2003246749A1/en not_active Abandoned
- 2003-07-16 CA CA002492585A patent/CA2492585A1/en not_active Abandoned
- 2003-07-16 JP JP2004520705A patent/JP4209389B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0816466A1 (en) * | 1995-03-20 | 1998-01-07 | Toto Ltd. | Method of photocatalytically making the surface of base material ultrahydrophilic, base material having ultrahydrophilic and photocatalytic surface, and process for producing said material |
EP0869156A1 (en) * | 1995-12-22 | 1998-10-07 | Toto Ltd. | Photocatalytic process for making surface hydrophilic and composite material having photocatalytically hydrophilic surface |
EP0853142A1 (en) * | 1997-01-14 | 1998-07-15 | Takenaka Corporation | Metal material having photocatalytic activity and method of manufacturing the same |
WO1998041482A1 (en) * | 1997-03-14 | 1998-09-24 | Ppg Industries Ohio, Inc. | Photocatalytically-activated self-cleaning appliances |
EP0980709A1 (en) * | 1998-08-18 | 2000-02-23 | Fuji Kihan Co., Ltd. | Photocatalyst coated products and a method for producing a photocatalyst layer |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009125057A1 (en) * | 2008-04-09 | 2009-10-15 | Metso Paper, Inc. | Method of working the surface of a machine element of a fiber web machine and a machine element of a fiber web machine |
DE102018120559A1 (en) * | 2018-08-23 | 2019-07-04 | Voith Patent Gmbh | Method for processing a roll cover |
DE102018120558A1 (en) * | 2018-08-23 | 2019-08-14 | Voith Patent Gmbh | Process for processing a press jacket |
Also Published As
Publication number | Publication date |
---|---|
EP1546452A1 (en) | 2005-06-29 |
DE60312709T2 (en) | 2007-12-06 |
CN1668809A (en) | 2005-09-14 |
EP1546452B1 (en) | 2007-03-21 |
KR20050036952A (en) | 2005-04-20 |
DE60312709D1 (en) | 2007-05-03 |
ATE357557T1 (en) | 2007-04-15 |
CN1329585C (en) | 2007-08-01 |
FI20021390A (en) | 2004-01-17 |
FI116389B (en) | 2005-11-15 |
US20050236128A1 (en) | 2005-10-27 |
JP4209389B2 (en) | 2009-01-14 |
JP2005532967A (en) | 2005-11-04 |
FI20021390A0 (en) | 2002-07-16 |
AU2003246749A1 (en) | 2004-02-02 |
CA2492585A1 (en) | 2004-01-22 |
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