CA2184911A1 - Method and device for application of fibres on a surface - Google Patents
Method and device for application of fibres on a surfaceInfo
- Publication number
- CA2184911A1 CA2184911A1 CA002184911A CA2184911A CA2184911A1 CA 2184911 A1 CA2184911 A1 CA 2184911A1 CA 002184911 A CA002184911 A CA 002184911A CA 2184911 A CA2184911 A CA 2184911A CA 2184911 A1 CA2184911 A1 CA 2184911A1
- Authority
- CA
- Canada
- Prior art keywords
- fibres
- base
- fibre
- amount
- application
- 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.)
- Abandoned
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
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
Wo 95l24272 r~
2~~84~ c~
~ethod and Device for P~l;r:~t;r,n of Fibres on a Surface.
State of the art:
When applying fibre# on a base an electrostatic method is 5 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 tf~rhni r:~l problem:
10 The problem that is solved by the present invention is to charge and convey f ibres to a surf ace, on which the f ibre 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 Sr,1~1tin 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 ;nr1ll~r~ a 20 charging tube, through which the fibre is driven. The ~ side of the chargin~ tube consists of a dielectric material, for instance PTFE ~polytetrafluorethylene) . This material is strongly electro-ne~ative and therefore tears electro~s from a material that has less electro-negativity. By controlling 25 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 o~ an electrically conducting material which is earthed 30 via an earth wire. Through this an electric current is flowing which is caused by the electron m;~rat;rn between the dielectric material of the char~ing tube and the material that is going to be applied- This enables read-out of the charging course by ~l-r;n~ the current in the earth wire.
The application material consists of fibres of variouS
m~aterials. r _ lee of materials are: Polyamide, Polyester nd similar material9- When a fibre becomes charged the charge is bound in its surface- An electrostatic field _ _ _ _ , . . .. .. _ . . _ . _ _ _ _ _ _ .
originates from the charged sur~ace T'le force of the electric field is det~rm;n~d by the amount of charge. In an angular particle such as the fibre, the ends operate as electrodes, which release part of the char~e to the environ-5 ment. Therefore a stron~ly charged particle will emit p:~rt ofthe charge to the surroundin~ air, which then will be ionized. This ; nA; r~t.'~ that there is a saturated charge that a particle of a certain shape may carry.
lO 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 15 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 f lows in the earth wire is measured and constitutes a measure of the amount of fibres that has been ch~rged and that this current is used to 20 control the amount of f ibres that are added so that this will be the intended. The added fibre ~uantity thereby can be controlled by means of a dosage device and a fan device.
The invention also refers to a device far application of 25 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 ch~rged fibres are directed towards the base. This can be desir~ned such, that the 30 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 f lows through the earth wire is measured and constitutes a measure of the amount of fibres that has been charged and that this 35 current is used to control the amount of ~ibres that is added by means of the dosage device and the fan device so that the amount will be the; nt~nAr tl An embodiment of the present invention is shown W0 95l24272 r~
2~ 8~ql i `
diay. t;cAlly in the drawing, in which ~Ç~ t C
Figure 1 shows the basic design of a device according to the invention, and r Figure 2 shows the function of an Arrl;~t;~n 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 raf~nt;3;n;n~ fibres to the application device 6, in which the f ibres 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 f ibrels ir 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 v~lue of the measured current constitutes the output value of a control device 12, which in .on~F.n~ e 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 i~ order to make the fibre stick on the base is freguently 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 th_ application according to the present invention normally is carried out, may be in the t range 50-300 fibres per s/;[uare mm, preferably more than 150 f ibres per s 3uare mm, with a fibre t~ kn-oc~:: smaller than 0 .1 mm, preferably less than 0. 05 ~m and a length in the range of 0.5-5 mm, preferably less than ~3 mm.
The invention is not limited to the above: ' 'i t.: but can be varied in different ways within the scope of the claims.
~ethod and Device for P~l;r:~t;r,n of Fibres on a Surface.
State of the art:
When applying fibre# on a base an electrostatic method is 5 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 tf~rhni r:~l problem:
10 The problem that is solved by the present invention is to charge and convey f ibres to a surf ace, on which the f ibre 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 Sr,1~1tin 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 ;nr1ll~r~ a 20 charging tube, through which the fibre is driven. The ~ side of the chargin~ tube consists of a dielectric material, for instance PTFE ~polytetrafluorethylene) . This material is strongly electro-ne~ative and therefore tears electro~s from a material that has less electro-negativity. By controlling 25 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 o~ an electrically conducting material which is earthed 30 via an earth wire. Through this an electric current is flowing which is caused by the electron m;~rat;rn between the dielectric material of the char~ing tube and the material that is going to be applied- This enables read-out of the charging course by ~l-r;n~ the current in the earth wire.
The application material consists of fibres of variouS
m~aterials. r _ lee of materials are: Polyamide, Polyester nd similar material9- When a fibre becomes charged the charge is bound in its surface- An electrostatic field _ _ _ _ , . . .. .. _ . . _ . _ _ _ _ _ _ .
originates from the charged sur~ace T'le force of the electric field is det~rm;n~d by the amount of charge. In an angular particle such as the fibre, the ends operate as electrodes, which release part of the char~e to the environ-5 ment. Therefore a stron~ly charged particle will emit p:~rt ofthe charge to the surroundin~ air, which then will be ionized. This ; nA; r~t.'~ that there is a saturated charge that a particle of a certain shape may carry.
lO 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 15 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 f lows in the earth wire is measured and constitutes a measure of the amount of fibres that has been ch~rged and that this current is used to 20 control the amount of f ibres that are added so that this will be the intended. The added fibre ~uantity thereby can be controlled by means of a dosage device and a fan device.
The invention also refers to a device far application of 25 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 ch~rged fibres are directed towards the base. This can be desir~ned such, that the 30 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 f lows through the earth wire is measured and constitutes a measure of the amount of fibres that has been charged and that this 35 current is used to control the amount of ~ibres that is added by means of the dosage device and the fan device so that the amount will be the; nt~nAr tl An embodiment of the present invention is shown W0 95l24272 r~
2~ 8~ql i `
diay. t;cAlly in the drawing, in which ~Ç~ t C
Figure 1 shows the basic design of a device according to the invention, and r Figure 2 shows the function of an Arrl;~t;~n 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 raf~nt;3;n;n~ fibres to the application device 6, in which the f ibres 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 f ibrels ir 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 v~lue of the measured current constitutes the output value of a control device 12, which in .on~F.n~ e 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 i~ order to make the fibre stick on the base is freguently 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 th_ application according to the present invention normally is carried out, may be in the t range 50-300 fibres per s/;[uare mm, preferably more than 150 f ibres per s 3uare mm, with a fibre t~ kn-oc~:: smaller than 0 .1 mm, preferably less than 0. 05 ~m and a length in the range of 0.5-5 mm, preferably less than ~3 mm.
The invention is not limited to the above: ' 'i t.: but can be varied in different ways within the scope of the claims.
Claims (8)
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.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 | ||
| SE9400804-2 | 1995-01-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2184911A1 true CA2184911A1 (en) | 1995-09-14 |
Family
ID=26661984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002184911A Abandoned CA2184911A1 (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) | FI963517A0 (en) |
| NO (1) | NO302867B1 (en) |
| SE (1) | SE502759C2 (en) |
| WO (1) | WO1995024272A1 (en) |
Families Citing this family (9)
| 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 |
| FR2750897B1 (en) * | 1996-07-10 | 1998-09-18 | Sames Sa | TRIBOELECTRIC PROJECTOR, COATING PRODUCT PROJECTION INSTALLATION AND METHOD FOR CONTROLLING SUCH A PROJECTOR |
| 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 |
| EP0904806B1 (en) | 1997-09-30 | 2002-10-23 | Alstom | Fluid mixing device |
| SE513126C2 (en) * | 1997-12-04 | 2000-07-10 | Nordson Corp | Device for detecting a flow of powder particles |
| US6645300B2 (en) | 2000-07-11 | 2003-11-11 | Nordson Corporation | Unipolarity powder coating systems including improved tribocharging and corona guns |
| JP2004502532A (en) * | 2000-07-11 | 2004-01-29 | ノードソン コーポレーション | A monopolar powder coating mechanism including an improved triboelectric corona gun |
| JP5651406B2 (en) * | 2010-08-11 | 2015-01-14 | 北海製罐株式会社 | Powder coating method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4031270A (en) * | 1975-06-02 | 1977-06-21 | Laidlaw Corporation | Method of flocking metal articles |
| GB2195924B (en) * | 1986-07-28 | 1991-01-09 | Mesac Corp | Electrostatic flocking apparatus |
| US5344082A (en) * | 1992-10-05 | 1994-09-06 | Nordson Corporation | Tribo-electric powder spray gun |
| DE69408035T2 (en) * | 1993-06-02 | 1998-07-02 | Matsu Sangyo Co Ltd | Triboelectric spray gun |
-
1995
- 1995-01-24 SE SE9500229A patent/SE502759C2/en not_active IP Right Cessation
- 1995-03-06 KR KR1019960704916A patent/KR970701591A/en not_active Application Discontinuation
- 1995-03-06 JP JP7523398A patent/JPH10511032A/en active Pending
- 1995-03-06 CN CN95191978A patent/CN1146167A/en active Pending
- 1995-03-06 CA CA002184911A patent/CA2184911A1/en not_active Abandoned
- 1995-03-06 AU AU19652/95A patent/AU686772B2/en not_active Ceased
- 1995-03-06 WO PCT/SE1995/000237 patent/WO1995024272A1/en not_active Application Discontinuation
- 1995-03-06 EP EP95912538A patent/EP0750527A1/en not_active Withdrawn
-
1996
- 1996-09-05 NO NO963708A patent/NO302867B1/en unknown
- 1996-09-06 FI FI963517A patent/FI963517A0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0750527A1 (en) | 1997-01-02 |
| NO963708D0 (en) | 1996-09-05 |
| NO963708L (en) | 1996-09-05 |
| NO302867B1 (en) | 1998-05-04 |
| CN1146167A (en) | 1997-03-26 |
| WO1995024272A1 (en) | 1995-09-14 |
| AU1965295A (en) | 1995-09-25 |
| AU686772B2 (en) | 1998-02-12 |
| FI963517A (en) | 1996-09-06 |
| KR970701591A (en) | 1997-04-12 |
| SE9500229D0 (en) | 1995-01-24 |
| FI963517A0 (en) | 1996-09-06 |
| JPH10511032A (en) | 1998-10-27 |
| SE9500229L (en) | 1995-09-07 |
| SE502759C2 (en) | 1996-01-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |