WO1995024272A1 - Method and device for application of fibres on a surface - Google Patents

Method and device for application of fibres on a surface Download PDF

Info

Publication number
WO1995024272A1
WO1995024272A1 PCT/SE1995/000237 SE9500237W WO9524272A1 WO 1995024272 A1 WO1995024272 A1 WO 1995024272A1 SE 9500237 W SE9500237 W SE 9500237W WO 9524272 A1 WO9524272 A1 WO 9524272A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibres
base
application
fibre
amount
Prior art date
Application number
PCT/SE1995/000237
Other languages
French (fr)
Inventor
Kjell K. Alm
Raymond Petersson
Original Assignee
Sealflock Aktiebolag
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 SE9400804A external-priority patent/SE9400804D0/en
Application filed by Sealflock Aktiebolag filed Critical Sealflock Aktiebolag
Priority to JP7523398A priority Critical patent/JPH10511032A/en
Priority to EP95912538A priority patent/EP0750527A1/en
Priority to AU19652/95A priority patent/AU686772B2/en
Priority to KR1019960704916A priority patent/KR970701591A/en
Publication of WO1995024272A1 publication Critical patent/WO1995024272A1/en
Priority to NO963708A priority patent/NO302867B1/en
Priority to FI963517A priority patent/FI963517A/en

Links

Classifications

    • 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
    • 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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/001—Flocking
    • B05C19/002—Electrostatic flocking

Definitions

  • the technical problem is to charge and convey fibres to a surface, on which the fibre shall be applied, without need of using electrically powered units to generate a high voltage.
  • the problem to control the supply of fibres is also solved.
  • the problem is solved by friction charging of the fibre. This is carried out by using differences in electro-negativity between two materials.
  • the application equipment includes a charging tube, through which the fibre is driven.
  • the inside of the charging tube consists of a dielectric material, for instance PTFE (polytetrafluorethylene) .
  • This material is strongly electro-negative and therefore tears electrons from a material that has less electro-negativity.
  • PTFE polytetrafluorethylene
  • the application material consists of fibres of various materials. Examples of materials are: Polya ide, Polyester and similar materials.
  • a fibre becomes charged the charge is bound in its surface.
  • An electrostatic field originates from the charged surface.
  • the force of the electric field is determined by the amount of charge.
  • an angular particle such as the fibre, the ends operate as electrodes, which release part of the charge to the environ- ment. Therefore a strongly charged particle will emit part of the charge to the surrounding air, which then will be ionized. This indicates that there is a saturated charge that a particle of a certain shape may carry.
  • the present invention thus refers to a method of application of fibres on a base, by which the base is provided with an adhesive and the fibres are given an electric charge through friction against a dielectric material and is directed towards the base.
  • the invention also refers to the dielectric material being applied to a surface of conducting material which by means of an earth wire is connected to earth and that the electric current that flows in the earth wire is measured and constitutes a measure of the amount of fibres that has been charged and that this current is used to control the amount of fibres that are added so that this will be the intended.
  • the added fibre quantity thereby can be controlled by means of a dosage device and a fan device.
  • the invention also refers to a device for application of fibres on a base, which includes at least one surface of a dielectric material against which the fibres are directed by means of a dosage device and a fan device and that the through friction electrically charged fibres are directed towards the base.
  • a dielectric material against which the fibres are directed by means of a dosage device and a fan device and that the through friction electrically charged fibres are directed towards the base.
  • This can be designed such, that the dielectric material is applied on at least one surface of conducting material which by means of an earth wire is connected to earth and that the electric current that flows through the earth wire is measured and constitutes a measure of the amount of fibres that has been charged and that this current is used to control the amount of fibres that is added by means of the dosage device and the fan device so that the amount will be the intended.
  • Figure 1 shows the basic design of a device according to the invention
  • Figure 2 shows the function of an application nozzle.
  • a fan unit 1 is provided to emit an air flow 2 to a dosage device 3 of fibres which can be provided with a container 4 from which the fibres are taken.
  • the dosage device 3 emits a second air flow 5 containing fibres to the application device 6, in which the fibres are charged electrostatically so that a flow 7 of air with charged fibres is emitted.
  • Figure 2 shows that the second air flow 5 with primarily uncharged fibres in the application device are directed towards a surface 9 of for instance a tube shaped part 8 of metal, whereby the surface 9 is coated with PTFE or other material which gives the fibres in the flow 7 electric charge.
  • the part 8 of metal is connected to earth through the earth wire 10, in which the current is measured by the measuring device 11.
  • the value of the measured current constitutes the output value of a control device 12, which in dependence of this and a set desired value emits a control signal to the dosage device 3 and possibly also to the fan 1.
  • the adhesive that is used in order to make the fibre stick on the base is frequently a two-component resin glue and the fibres are generally synthetic fibres of for instance poly- amide.
  • the fibres which may be used for the present invention are however not limited to any special type, but also for instance coal fibres, glass fibres or the like may be used.
  • the fibre density by which the application according to the present invention normally is carried out, may be in the range 50-300 fibres per square mm, preferably more than 150 fibres per square mm, with a fibre thickness smaller than 0.1 mm, preferably less than 0.05 mm and a length in the range of 0.5-5 mm, preferably less than 3 mm.

Landscapes

  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Elimination Of Static Electricity (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

The invention refers to a method and a device for application of fibres on a base. The probelm that is solved by the present invention is to charge and convey fibres to a surface, on which the fibre is going to be applied, without need of using electrically powered units to generate a high voltage. This is carried out by friction charging of the fibre. This is achieved by using differences in electro-negativity between two materials. The application equipment includes a charging tube (8), through which the fibre is driven. The inside of the charging tube (8) consists of a dielectric material (9), for instance PTFE. This material is strongly electro-negative and therefore tears electrons from materials that have less electro-negativity.

Description

Method and Device for Application of Fibres on a Surface.
State of the art:
When applying fibres on a base an electrostatic method is frequently used, by which a high voltage is used to charge the fibres and bring them towards a surface. Similar methods are also used to apply powder on a base.
The technical problem: The problem that is solved by the present invention is to charge and convey fibres to a surface, on which the fibre shall be applied, without need of using electrically powered units to generate a high voltage. The problem to control the supply of fibres is also solved.
The solution:
The problem is solved by friction charging of the fibre. This is carried out by using differences in electro-negativity between two materials. The application equipment includes a charging tube, through which the fibre is driven. The inside of the charging tube consists of a dielectric material, for instance PTFE (polytetrafluorethylene) . This material is strongly electro-negative and therefore tears electrons from a material that has less electro-negativity. By controlling and regulating both the ■ amount of material and particle velocity through the charging tube, one may optimize the process regarding to particle charge. The surplus of electrons in the charging tube is evened out by this being made of an electrically conducting material which is earthed via an earth wire. Through this an electric current is flowing which is caused by the electron migration between the dielectric material of the charging tube and the material that is going to be applied. This enables read-out of the charging course by measuring the current in the earth wire.
The application material consists of fibres of various materials. Examples of materials are: Polya ide, Polyester and similar materials. When a fibre becomes charged the charge is bound in its surface. An electrostatic field originates from the charged surface. The force of the electric field is determined by the amount of charge. In an angular particle such as the fibre, the ends operate as electrodes, which release part of the charge to the environ- ment. Therefore a strongly charged particle will emit part of the charge to the surrounding air, which then will be ionized. This indicates that there is a saturated charge that a particle of a certain shape may carry.
The present invention thus refers to a method of application of fibres on a base, by which the base is provided with an adhesive and the fibres are given an electric charge through friction against a dielectric material and is directed towards the base. The invention also refers to the dielectric material being applied to a surface of conducting material which by means of an earth wire is connected to earth and that the electric current that flows in the earth wire is measured and constitutes a measure of the amount of fibres that has been charged and that this current is used to control the amount of fibres that are added so that this will be the intended. The added fibre quantity thereby can be controlled by means of a dosage device and a fan device.
The invention also refers to a device for application of fibres on a base, which includes at least one surface of a dielectric material against which the fibres are directed by means of a dosage device and a fan device and that the through friction electrically charged fibres are directed towards the base. This can be designed such, that the dielectric material is applied on at least one surface of conducting material which by means of an earth wire is connected to earth and that the electric current that flows through the earth wire is measured and constitutes a measure of the amount of fibres that has been charged and that this current is used to control the amount of fibres that is added by means of the dosage device and the fan device so that the amount will be the intended.
An embodiment of the present invention is shown diagrammatically in the drawing, in which
Figure 1 shows the basic design of a device according to the invention, and Figure 2 shows the function of an application nozzle.
As shown in Figure 1 a fan unit 1 is provided to emit an air flow 2 to a dosage device 3 of fibres which can be provided with a container 4 from which the fibres are taken. The dosage device 3 emits a second air flow 5 containing fibres to the application device 6, in which the fibres are charged electrostatically so that a flow 7 of air with charged fibres is emitted. Figure 2 shows that the second air flow 5 with primarily uncharged fibres in the application device are directed towards a surface 9 of for instance a tube shaped part 8 of metal, whereby the surface 9 is coated with PTFE or other material which gives the fibres in the flow 7 electric charge. The part 8 of metal is connected to earth through the earth wire 10, in which the current is measured by the measuring device 11. The value of the measured current constitutes the output value of a control device 12, which in dependence of this and a set desired value emits a control signal to the dosage device 3 and possibly also to the fan 1.
The adhesive that is used in order to make the fibre stick on the base is frequently a two-component resin glue and the fibres are generally synthetic fibres of for instance poly- amide. The fibres which may be used for the present invention are however not limited to any special type, but also for instance coal fibres, glass fibres or the like may be used.
The fibre density, by which the application according to the present invention normally is carried out, may be in the range 50-300 fibres per square mm, preferably more than 150 fibres per square mm, with a fibre thickness smaller than 0.1 mm, preferably less than 0.05 mm and a length in the range of 0.5-5 mm, preferably less than 3 mm.
The invention is not limited to the above embodiments but can be varied in different ways within the scope of the claims.

Claims

1. A method for application of fibres on a base, wherein the base is provided with an adhesive and that the fibres are electrically charged by friction against a dielectric material and are directed towards the base.
2. A method according to claim 1, wherein the dielectric material is applied on a surface of a conducting material which is connected to earth through an earth wire, the electric current that flows in the earth wire is measured and forms a measure of the amount of fibres being charged, and this current is used to control the amount of fibres being added to an intended value.
3. A method according to claim 2, wherein the amount of fibres is defined by a dosage device and a fan device.
4. A method according to any of claims 1-3, wherein the length of the fibres is between 0.5 and 5 mm and they are applied with a density in the range of 50-300 fibres per square mm.
5. A device for application of fibres on a base, including at least one surface (9) of a dielectric material towards which the fibres are directed and that the fibres, electrically charged by the friction, are directed towards the base.
6. A device according to claim 5, wherein the fibres are directed towards the surface (9) by means of a dosage device
(3) and a fan device (1) .
7. A device according to claim 5 or 6, wherein the dielectric material (9) is applied on at least one surface of a conducting material (8) which by an earth wire (10) is connected to earth and that the electric current in the earth wire is measured and forms a measure of the amount of fibres being charged, said electrical current is used to control the amount of fibres being added.
8. A device according to any of claims 5 - 7, wherein the length of the fibres is between 0.5 and 5 mm and they are applied with a density in the range of 50-300 fibres per square mm.
PCT/SE1995/000237 1994-03-06 1995-03-06 Method and device for application of fibres on a surface WO1995024272A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP7523398A JPH10511032A (en) 1994-03-06 1995-03-06 Method and apparatus for application of fibers to surfaces
EP95912538A EP0750527A1 (en) 1994-03-06 1995-03-06 Method and device for application of fibres on a surface
AU19652/95A AU686772B2 (en) 1994-03-06 1995-03-06 Method and device for application of fibres on a surface
KR1019960704916A KR970701591A (en) 1994-03-06 1995-03-06 METHOD AND DEVICE FOR APPLICATION OF FIBRES ON A SURFACE
NO963708A NO302867B1 (en) 1994-03-06 1996-09-05 Method and apparatus for applying fibers to a surface
FI963517A FI963517A (en) 1994-03-06 1996-09-06 Method for coating a surface with fibers and a suitable device therefor

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE9400804-2 1994-03-06
SE9400804A SE9400804D0 (en) 1994-03-06 1994-03-06 Method and apparatus for applying fibers to a surface
SE9500229A SE502759C2 (en) 1994-03-06 1995-01-24 Method and apparatus for applying fibers by means of friction charging
SE9500229-1 1995-01-24

Publications (1)

Publication Number Publication Date
WO1995024272A1 true WO1995024272A1 (en) 1995-09-14

Family

ID=26661984

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1995/000237 WO1995024272A1 (en) 1994-03-06 1995-03-06 Method and device for application of fibres on a surface

Country Status (10)

Country Link
EP (1) EP0750527A1 (en)
JP (1) JPH10511032A (en)
KR (1) KR970701591A (en)
CN (1) CN1146167A (en)
AU (1) AU686772B2 (en)
CA (1) CA2184911A1 (en)
FI (1) FI963517A (en)
NO (1) NO302867B1 (en)
SE (1) SE502759C2 (en)
WO (1) WO1995024272A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0818245A1 (en) * 1996-07-10 1998-01-14 Sames S.A. Triboelectric spray gun, installation for spraying coating products and method for controlling such a gun
EP0904806A1 (en) 1997-09-30 1999-03-31 Asea Brown Boveri AG Fluid mixing device
WO1999030830A1 (en) * 1997-12-04 1999-06-24 Nordson Corporation A device for detecting a flow of powder particles
WO2002004127A3 (en) * 2000-07-11 2002-06-13 Nordson Corp Unipolarity powder coating systems including improved tribocharging and corona guns
US6645300B2 (en) 2000-07-11 2003-11-11 Nordson Corporation Unipolarity powder coating systems including improved tribocharging and corona guns

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9503195L (en) * 1995-09-13 1997-03-14 Laray Ab Procedure for flocking
SE508733C2 (en) * 1996-02-29 1998-11-02 Sealcoat 1 Ab Method and apparatus for coating adhesive-coated surface with fiber flock
SE511775C2 (en) * 1997-04-14 1999-11-22 Applied Composites Ab Acab Process for thermal spraying of a surface with an additive and product prepared according to the process
JP5651406B2 (en) * 2010-08-11 2015-01-14 北海製罐株式会社 Powder coating method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031270A (en) * 1975-06-02 1977-06-21 Laidlaw Corporation Method of flocking metal articles
US4879969A (en) * 1986-07-28 1989-11-14 Toyo Flocking Co. Electrostatic flocking apparatus
EP0592137A1 (en) * 1992-10-05 1994-04-13 Nordson Corporation Tribo-electric powder spray gun
EP0627265A1 (en) * 1993-06-02 1994-12-07 Matsuo Sangyo Co., Ltd. Frictional electrification gun

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031270A (en) * 1975-06-02 1977-06-21 Laidlaw Corporation Method of flocking metal articles
US4879969A (en) * 1986-07-28 1989-11-14 Toyo Flocking Co. Electrostatic flocking apparatus
EP0592137A1 (en) * 1992-10-05 1994-04-13 Nordson Corporation Tribo-electric powder spray gun
EP0627265A1 (en) * 1993-06-02 1994-12-07 Matsuo Sangyo Co., Ltd. Frictional electrification gun

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0818245A1 (en) * 1996-07-10 1998-01-14 Sames S.A. Triboelectric spray gun, installation for spraying coating products and method for controlling such a gun
FR2750897A1 (en) * 1996-07-10 1998-01-16 Sames Sa TRIBOELECTRIC PROJECTOR, COATING PROJECTION INSTALLATION SYSTEM AND METHOD FOR CONTROLLING SUCH A PROJECTOR
EP0904806A1 (en) 1997-09-30 1999-03-31 Asea Brown Boveri AG Fluid mixing device
WO1999030830A1 (en) * 1997-12-04 1999-06-24 Nordson Corporation A device for detecting a flow of powder particles
US6734679B2 (en) 1997-12-04 2004-05-11 Nordson Corporation Device for detecting a flow of powder particles
WO2002004127A3 (en) * 2000-07-11 2002-06-13 Nordson Corp Unipolarity powder coating systems including improved tribocharging and corona guns
US6645300B2 (en) 2000-07-11 2003-11-11 Nordson Corporation Unipolarity powder coating systems including improved tribocharging and corona guns

Also Published As

Publication number Publication date
JPH10511032A (en) 1998-10-27
SE9500229L (en) 1995-09-07
CN1146167A (en) 1997-03-26
KR970701591A (en) 1997-04-12
SE502759C2 (en) 1996-01-08
CA2184911A1 (en) 1995-09-14
NO302867B1 (en) 1998-05-04
AU686772B2 (en) 1998-02-12
FI963517A0 (en) 1996-09-06
NO963708D0 (en) 1996-09-05
FI963517A (en) 1996-09-06
SE9500229D0 (en) 1995-01-24
AU1965295A (en) 1995-09-25
EP0750527A1 (en) 1997-01-02
NO963708L (en) 1996-09-05

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