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WO2003076718A2 - A method for treating powdery particles - Google Patents

A method for treating powdery particles Download PDF

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Publication number
WO2003076718A2
WO2003076718A2 PCT/FI2003/000185 FI0300185W WO03076718A2 WO 2003076718 A2 WO2003076718 A2 WO 2003076718A2 FI 0300185 W FI0300185 W FI 0300185W WO 03076718 A2 WO03076718 A2 WO 03076718A2
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
web
electrode
particles
powdery
Prior art date
Application number
PCT/FI2003/000185
Other languages
French (fr)
Other versions
WO2003076718A3 (en
Inventor
Veli KÄSMÄ
Juha Maijala
Kaisa Putkisto
Pasi Ahonen
Vilho Nissinen
Timo R. Nyberg
Original Assignee
Metso Paper, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from FI20020479A external-priority patent/FI118542B/en
Application filed by Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to AU2003209798A priority Critical patent/AU2003209798A1/en
Publication of WO2003076718A2 publication Critical patent/WO2003076718A2/en
Publication of WO2003076718A3 publication Critical patent/WO2003076718A3/en

Links

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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/087—Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
    • 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
    • D21H23/50—Spraying or projecting
    • 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
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/64—Addition to the formed paper by contacting paper with a device carrying the material the material being non-fluent at the moment of transfer, e.g. in form of preformed, at least partially hardened coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/007—Processes for applying liquids or other fluent materials using an electrostatic field
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/02—Sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/10—Applying the material on both sides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders

Definitions

  • the present invention relates to a method for treating powder in a process in which a powdery layer is formed on a web having a first side and a second side by utilizing electric forces in such a manner that at least one electrode is located at the first side of the web, at least one electrode is located at the second side of the web, and the electrodes at different sides are in different potentials.
  • the method of the invention can be applied.
  • the method is used in a process in which a dry powder is applied on a substrate by utilizing electric forces.
  • the dry powder may comprise inorganic particles, binder particles, plastic particles, or other polymeric particles.
  • the dry powder may form a coating layer, or a film layer.
  • the coating layer is aimed to replace conventional paper coatings
  • the film layer is aimed to replace conventional film layers, such as a plastic film on a paper substrate.
  • a powder application unit which includes at least one electrode at the both sides of the substrate.
  • the electrodes are in different potentials.
  • the dry powder is applied on the substrate in such a manner that the electrodes at the opposite sides of the substrate form an electric field in which the particles of the dry powder are blown through a feeding nozzle.
  • the layer formed of the dry powder is finished by a suitable manner in a final fixing device, for example by thermomechanical treatment, such as calendering.
  • the substrate can be treated only one surface at a time, or both surfaces at the same time. It is also possible that two or more layers are formed one upon the other.
  • the substrate to be treated is a web, which may be a sheet-like substrate, or a surface onto which a film is formed and peeled off as a ready product.
  • a web which may be a sheet-like substrate, or a surface onto which a film is formed and peeled off as a ready product.
  • the material of the sheet-like substrate may comprise papermaking fibers, for example chemical pulp and/or mechanical cal pulp, or it may be plastic, metallic, or a metal-coated plastic material.
  • the method of the invention is characterized in that the powdery layer is recovered from the web by utilizing electric forces.
  • the powdery particles are adhered loosely by the electrostatic forces on the substrate before they are finally fixed on the substrate.
  • the detachment unit is located after the powder application unit but before the final fixing device.
  • the secondary electrodes have opposite potential and charges compared to the particles of the powdery layer, i.e. the secondary electrodes are capable for forming a reverse electric field compared to the electrodes in the application unit.
  • the particles and the paper start to repel each other (they have a similar charge) and the electric field created by the secondary electrodes transfers the particles away from the paper towards e.g. the grounding / collector electrode.
  • the detachment may be done cyclic e.g.
  • the removing of the particles may have prior treatments or local in situ treatments, which enhance the recovering process.
  • the prior treatments may include specific processes related to the raw materials, for example electrostatic treatments.
  • the in situ treatments may include using of an air doctor or ultrasound to help in removing the powder.
  • means for recycling may be used.
  • a recycling configuration may comprise a direct circulation, or it may include also cyclones for separating different powder fractions.
  • the recovering device must be constructed so that the powder deposits are avoided.
  • the process line comprises an application device 1, a recovering device, which includes a detachment device 2a and a removing device 2b, and a fixing device 3 comprising for example a heated nip formed between two rolls.
  • a substrate 4 in a web form having an first surface 4a and a second surface 4b travels in the process line.
  • the application device 1 may comprise a positive charging electrode situating at the first surface 4a and a grounding electrode situating at the second surface 4b.
  • the powdery particles are charged positively, and they are blown to the first surface 4a.
  • the positively charged particles are drawn by the grounding electrode, and thus they are adhered on the first surface 4a.
  • the detachment device 2a includes a positive electrode, which detaches the powdery particles from the first surface 4a because the electric field affecting the powder particles is opposite and the charges having a similar polarity repel each other.
  • the removing device 2b recovers the powdery particles, and possibly leads them for reuse.
  • the removing device 2b may comprise for example suction to recover the powdery particles. Before suction there may be for example an air doctor, which intensify loosening of the particles from the substrate. In such a manner, only the substrate ends in the rejected material or for specific recycling.
  • the process line in which the method of the invention is used may differ from the described process.
  • the sign of the electrode in the detachment device depends on the electrodes used in the application device; the electrode in the detachment device must show the same sign as the electrode at the first side of the substrate if the detachment device is located at the second side of the substrate.
  • both sides of the substrate are treated simultaneously there must be an electrode at both sides of the substrate, which have a different polarity compared to the electrode at the same side of the substrate in the application device.
  • the main idea in this invention is that the dry powder can be recovered from the process very effectively when it is necessary.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Electrostatic Separation (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A method for treating powder in a process in which a powdery layer is formed on a web (4) having a first side (4a) and a second side (4b) by utilizing electric forces in such a manner that at least one electrode is located at the first side (4a) of the web, at least one electrode is located at the second side (4b) of the web, and the electrodes at different sides are in different potentials. The powdery layer is recovered from the web by utilizing electric forces (2a, 2b).

Description

A method for treating powdery particles
The present invention relates to a method for treating powder in a process in which a powdery layer is formed on a web having a first side and a second side by utilizing electric forces in such a manner that at least one electrode is located at the first side of the web, at least one electrode is located at the second side of the web, and the electrodes at different sides are in different potentials.
There are a few alternative processes in which the method of the invention can be applied. In general, the method is used in a process in which a dry powder is applied on a substrate by utilizing electric forces. The dry powder may comprise inorganic particles, binder particles, plastic particles, or other polymeric particles. In a final product, the dry powder may form a coating layer, or a film layer. Typically, the coating layer is aimed to replace conventional paper coatings, and the film layer is aimed to replace conventional film layers, such as a plastic film on a paper substrate.
In the process arrangement, there is a powder application unit, which includes at least one electrode at the both sides of the substrate. The electrodes are in different potentials. The dry powder is applied on the substrate in such a manner that the electrodes at the opposite sides of the substrate form an electric field in which the particles of the dry powder are blown through a feeding nozzle. The layer formed of the dry powder is finished by a suitable manner in a final fixing device, for example by thermomechanical treatment, such as calendering. The substrate can be treated only one surface at a time, or both surfaces at the same time. It is also possible that two or more layers are formed one upon the other.
The substrate to be treated is a web, which may be a sheet-like substrate, or a surface onto which a film is formed and peeled off as a ready product. There is a wide variety for the material of the sheet-like substrate; it may comprise papermaking fibers, for example chemical pulp and/or mechanical cal pulp, or it may be plastic, metallic, or a metal-coated plastic material. There are, however, certain fields in the technique that need some fine adjustment to make the process even better, and the method of the invention is one of them. The method of the invention is characterized in that the powdery layer is recovered from the web by utilizing electric forces.
When the process is started, or production parameters are changed there is a possibility that the manufactured product does not meet the quality requirements, for example due to too small amount of coating powder, or a patterned surface structure. Therefore, it is needless to make the product ready, i.e. finish the product, and at the same time loose both the substrate and the powder. When such a case is observed it is possible to remove the powdery layer from the substrate before fixing it on the substrate. It is also possible to use the above- mentioned procedure when there is a web break to avoid dusting.
The powdery particles are adhered loosely by the electrostatic forces on the substrate before they are finally fixed on the substrate. To remove an excess amount of the powder secondary electrodes in a detachment unit are used. The detachment unit is located after the powder application unit but before the final fixing device. The secondary electrodes have opposite potential and charges compared to the particles of the powdery layer, i.e. the secondary electrodes are capable for forming a reverse electric field compared to the electrodes in the application unit. Thus the particles and the paper start to repel each other (they have a similar charge) and the electric field created by the secondary electrodes transfers the particles away from the paper towards e.g. the grounding / collector electrode. The detachment may be done cyclic e.g. by using electric fields with changing polarity. The removing of the particles may have prior treatments or local in situ treatments, which enhance the recovering process. The prior treatments may include specific processes related to the raw materials, for example electrostatic treatments. The in situ treatments may include using of an air doctor or ultrasound to help in removing the powder. Also means for recycling may be used. A recycling configuration may comprise a direct circulation, or it may include also cyclones for separating different powder fractions. The recovering device must be constructed so that the powder deposits are avoided.
In the following, the method of the invention is explained by a drawing, which shows a schematic side view of the process in which the method of the invention is applied.
The process line comprises an application device 1, a recovering device, which includes a detachment device 2a and a removing device 2b, and a fixing device 3 comprising for example a heated nip formed between two rolls. A substrate 4 in a web form having an first surface 4a and a second surface 4b travels in the process line. The application device 1 may comprise a positive charging electrode situating at the first surface 4a and a grounding electrode situating at the second surface 4b. The powdery particles are charged positively, and they are blown to the first surface 4a. The positively charged particles are drawn by the grounding electrode, and thus they are adhered on the first surface 4a.
In the above-mentioned case, the detachment device 2a includes a positive electrode, which detaches the powdery particles from the first surface 4a because the electric field affecting the powder particles is opposite and the charges having a similar polarity repel each other. The removing device 2b recovers the powdery particles, and possibly leads them for reuse. The removing device 2b may comprise for example suction to recover the powdery particles. Before suction there may be for example an air doctor, which intensify loosening of the particles from the substrate. In such a manner, only the substrate ends in the rejected material or for specific recycling.
The invention is not restricted to the description above, but it may vary within the scope of the claims. The process line in which the method of the invention is used may differ from the described process. The sign of the electrode in the detachment device depends on the electrodes used in the application device; the electrode in the detachment device must show the same sign as the electrode at the first side of the substrate if the detachment device is located at the second side of the substrate. In a case when both sides of the substrate are treated simultaneously there must be an electrode at both sides of the substrate, which have a different polarity compared to the electrode at the same side of the substrate in the application device. The main idea in this invention is that the dry powder can be recovered from the process very effectively when it is necessary.

Claims

Claims:
1. A method for treating powder in a process in which a powdery layer is formed on a web having a first side and a second side by utilizing electric forces in such a manner that at least one electrode is located at the first side of the web, at least one electrode is located at the second side of the web, and the electrodes at different sides are in different potentials, characterized in that the powdery layer is recovered from the web by utilizing electric forces.
2. The method according to claim 1 , characterized in that the powdery layer of the substrate, which is formed in an application unit, is detached from the surface of the substrate in a detachment unit, which creates a reverse electric field compared to that in the application unit.
3. The method according to claim 1 or 2, characterized in that the powdery layer is recovered and led to recycling.
PCT/FI2003/000185 2002-03-14 2003-03-11 A method for treating powdery particles WO2003076718A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003209798A AU2003209798A1 (en) 2002-03-14 2003-03-11 A method for treating powdery particles

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI20020479 2002-03-14
FI20020479A FI118542B (en) 2002-03-14 2002-03-14 Finishing process
FI20021648 2002-09-16
FI20021648A FI113075B (en) 2002-03-14 2002-09-16 Process for action of powdery particles

Publications (2)

Publication Number Publication Date
WO2003076718A2 true WO2003076718A2 (en) 2003-09-18
WO2003076718A3 WO2003076718A3 (en) 2003-12-11

Family

ID=26161292

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2003/000185 WO2003076718A2 (en) 2002-03-14 2003-03-11 A method for treating powdery particles

Country Status (3)

Country Link
AU (1) AU2003209798A1 (en)
FI (1) FI113075B (en)
WO (1) WO2003076718A2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004067191A2 (en) * 2003-01-29 2004-08-12 President And Fellows Of Harward College Alteration of surface affinities
US7208429B2 (en) 2004-12-02 2007-04-24 The Procter + Gamble Company Fibrous structures comprising a nonoparticle additive
US7459179B2 (en) 2004-12-02 2008-12-02 The Procter & Gamble Company Process for making a fibrous structure comprising an additive
US7976679B2 (en) 2004-12-02 2011-07-12 The Procter & Gamble Company Fibrous structures comprising a low surface energy additive

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4990359A (en) * 1989-11-13 1991-02-05 Nordson Corporation Electrostatic method for coating redistribution
EP0435035A1 (en) * 1989-12-26 1991-07-03 Ball Corporation Electrostatically depositing and electrostatically neutralizing

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1176919A (en) * 1997-09-02 1999-03-23 Dainippon Toryo Co Ltd Reusing of powder coating material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4990359A (en) * 1989-11-13 1991-02-05 Nordson Corporation Electrostatic method for coating redistribution
EP0435035A1 (en) * 1989-12-26 1991-07-03 Ball Corporation Electrostatically depositing and electrostatically neutralizing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section PQ, Week 199922 Derwent Publications Ltd., London, GB; Class P42, AN 1999-258656 XP002255782 & JP 11 076919 A (DAINIPPON TORYO KK), 23 March 1999 (1999-03-23) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004067191A2 (en) * 2003-01-29 2004-08-12 President And Fellows Of Harward College Alteration of surface affinities
WO2004067191A3 (en) * 2003-01-29 2004-12-23 Harvard College Alteration of surface affinities
US7659053B2 (en) 2003-01-29 2010-02-09 President And Fellows Of Harvard College Methods of alteration of surface affinities using non-chemical force-creating fields
US7208429B2 (en) 2004-12-02 2007-04-24 The Procter + Gamble Company Fibrous structures comprising a nonoparticle additive
US7459179B2 (en) 2004-12-02 2008-12-02 The Procter & Gamble Company Process for making a fibrous structure comprising an additive
US7976679B2 (en) 2004-12-02 2011-07-12 The Procter & Gamble Company Fibrous structures comprising a low surface energy additive
US8398821B2 (en) 2004-12-02 2013-03-19 The Procter & Gamble Company Fibrous structures comprising a low surface energy additive

Also Published As

Publication number Publication date
WO2003076718A3 (en) 2003-12-11
FI20021648A (en) 2003-09-15
FI113075B (en) 2004-02-27
AU2003209798A1 (en) 2003-09-22
AU2003209798A8 (en) 2003-09-22
FI20021648A0 (en) 2002-09-16

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