EP0515414B1 - Vorrichtung zur reinigung vor bewegten bahnen - Google Patents

Vorrichtung zur reinigung vor bewegten bahnen Download PDF

Info

Publication number
EP0515414B1
EP0515414B1 EP91903320A EP91903320A EP0515414B1 EP 0515414 B1 EP0515414 B1 EP 0515414B1 EP 91903320 A EP91903320 A EP 91903320A EP 91903320 A EP91903320 A EP 91903320A EP 0515414 B1 EP0515414 B1 EP 0515414B1
Authority
EP
European Patent Office
Prior art keywords
web
particles
air
corona discharge
electrode
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.)
Expired - Lifetime
Application number
EP91903320A
Other languages
English (en)
French (fr)
Other versions
EP0515414A1 (de
Inventor
Roger Arthur Whitney
Raymond John Cox
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kodak Ltd
Eastman Kodak Co
Original Assignee
Kodak Ltd
Eastman Kodak Co
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
Application filed by Kodak Ltd, Eastman Kodak Co filed Critical Kodak Ltd
Publication of EP0515414A1 publication Critical patent/EP0515414A1/de
Application granted granted Critical
Publication of EP0515414B1 publication Critical patent/EP0515414B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B6/00—Cleaning by electrostatic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • B08B5/023—Cleaning travelling work
    • B08B5/026—Cleaning moving webs

Definitions

  • This invention relates to web cleaning apparatus, and is more particularly concerned with non-contact web cleaning apparatus.
  • non-contact web cleaners clean air at high velocity is passed over the surface of the web to remove debris. It is also known to utilise electrostatic charges to neutralise the charge which may be attracting the debris or dirt to the surface of the web.
  • US Patent Specification US-A-2920987 describes an arrangement which can be used to clean the surface of a non-conducting material.
  • a high alternating voltage supply is applied to the material by means of an electrode positioned adjacent one surface of the web. This alternating voltage damps out the static charge present on the surface of the material due to a previous operation, for example, a grinding operation.
  • Arranged on the opposite side of the material to the electrode is a series of projections which contact the material. Particles on the material after the grinding operation, say, are removed due to the electrostatic effect produced by the electrode and the physical contact of the projections with the material itself. Loosened particles are removed from the surface of the material by suction.
  • US Patent Specification US-A-4213167 discloses an arrangement in which both surfaces of a web are cleaned by causing air to flow over both surfaces, and introducing ions into the air flow to neutralise static charge on the web.
  • Other examples of the use of ionised air streams to remove dust are disclosed in US Patent Specifications US-A-4454621 and US-A-4241377.
  • US Patent Specification US-A-4835808 discloses an arrangement which utilises both suction and blowing to remove particles from the surface of a web. A field plate is also used to charge the web and an electrode is used to discharge the web thereby removing the particles. US Patent Specification US-A-3536528 also discloses the use of suction and blowing to remove particles from the surface of a web, but in this case, the charge on the web is neutralised after cleaning.
  • French Patent Application FR-A-2179707 discloses apparatus and method for cleaning glass sheets. Electrostatic charge is generated on the sheet by means of corona discharge as it passes between two electrode strips arranged transverse to the direction of motion of the glass sheets, each strip having a plurality of needle electrodes arranged along its length. These electrode strips are used to discharge particles adhering to the glass sheet and once discharged, the particles are removed using an airstream.
  • Web cleaners which use ions to discharge the electrostatic charges holding particles against the surface of the web are only effective at low web speeds. However, this may prevent particles being re-attracted to the web after they have been loosened.
  • a method of cleaning web material comprising, passing the web through an air gap, the air gap being defined by a first surface over which the web passes, the web being supported by the first surface, and a second surface spaced from the first surface, producing a corona discharge across the air gap to generate electrostatic forces on the web and on the particles to cause at least some of the particles to lift off the surface of the web, and removing particles from the web.
  • the corona discharge is produced by an alternating voltage supply.
  • a web cleaning apparatus for use in a method as described above which comprises:- means for defining an air gap, comprising a first surface over which the web passes, the web being supported by the first surface, and a second surface spaced from the first surface, generator means for producing a corona discharge in the air gap, and means for removing particles loosened by the corona discharge.
  • At least one of the first and second surfaces is an insulating surface so that the corona discharge does not only occur at a single point.
  • the generator means may be a high voltage alternating supply.
  • the particles Once the particles have been loosened, they can be removed using a high velocity air stream. Additionally, or alternatively, suction means can be used to remove the loosened particles.
  • the generator means operates at a frequency between 1 to 5kHz.
  • the present invention aims to deposit a significant charge of one sign on the web and then subject it to an electric field of the opposite sign to produce a force to dislodge particles from the surface of the web. Particles so dislodged can then be removed by an air stream passing over the surface of the web, or by suction applied to the web surface.
  • the apparatus shown in Figure 1 comprises a cylinder 12 over which a web 10 to be cleaned is passed.
  • the surface of the cylinder 12 has a layer 14 of insulating material placed on it.
  • the rest of the apparatus is positioned above the cylinder 12, and is mounted in a housing 16.
  • An electrode 18 is positioned above the cylinder 12 so that the web 10 passes through a gap 20 formed between the cylinder 12 and the electrode 18.
  • the electrode 18 has an insulating surface 19, and is connected to a high voltage alternating supply (not shown) which causes a corona discharge to occur in the gap 20.
  • the insulating surface 19 and the layer 14 may not be required, the insulating surface being provided by the web itself.
  • An air supply arrangement 22 for supplying air to and removing air from the gap 20 is attached to an upper wall 24 of the housing 16 as shown.
  • the arrangement 22 comprises a blower section 26 and a suction section 28 positioned adjacent one another with a dividing wall 30 therebetween.
  • Each section 26, 28 has a respective opening 32, 34 which allows the passage of air into and out of that section.
  • the arrangement 22 also provides a means of positioning the electrode 18 above the surface of the cylinder 12.
  • An insulating support member 36 is attached at one end to the arrangement 22 and at the other to the electrode 18.
  • the support member 36 is positioned between the openings 32, 34 thereby forming two ducts 38, 40, with further walls 42, 44.
  • the walls 42, 44 are also made of insulating material so that the ducts 38, 40 so formed are non-conducting.
  • a member 46 is attached to the lower end 48 of wall 42 and extends perpendicularly to it.
  • the apparatus operates as follows:
  • An alternating high voltage is applied to the electrode 18. Charging of the web and the production of forces into and away from the surface of the web occurs each half cycle of the alternating applied voltage.
  • the strength of the electric field exceeds the breakdown strength for the air in the air gap 20, and a charge of the same sign as the applied electrode voltage is deposited on the surface of the web 10.
  • the electrostatic forces produced by the alternating voltage cause at least some of the particles attached thereto to lift off the surface of the web 10, so that they can then be removed by air supplied to the surface of the web through the air jet 50, and removed from that surface by the suction section 28 of the air supply arrangement 22.
  • the relationship between the alternating voltage waveform and the removal of particles from the surface of the web 10 is shown in Figure 2.
  • an alternating voltage waveform 100 is shown.
  • a regular sinusoidal waveform is shown but any other suitable alternating waveform can be used.
  • a current waveform 102 and a force 'waveform' 104 are also shown.
  • the waveforms 102 and 104 are depicted on the same time scale as the voltage waveform 100.
  • the alternating voltage supply (not shown) is chosen to have a voltage which produces an electric field to loosen the particles from the surface of the web, the voltage having a maximum value to produce an electric field exceeding the breakdown strength of the air in the air gap 20.
  • the electrode 18 is shaped so that breakdown occurs along the entire width of the web 10, and the corona discharge produced in the gap 20 is not concentrated at one point only.
  • the gap 20 is small, preferably less than 4mm, but any suitable value can be chosen according to the particular arrangement of the apparatus.
  • the size of the air gap is determined by known parameters which affect the production of a corona discharge.
  • the alternating high voltage supply is chosen to have a frequency which is of several kHz, preferably in the range of 1 to 5kHz, although other frequencies may be workable according to the particular embodiment of the apparatus.
  • the frequency of the alternating voltage is related to the speed of the web.
  • the web For the apparatus to work, the web must be under the electrode for at least half a cycle of the alternating voltage. However, it is preferred that the web is under the electrode for more than 2 cycles. With this in mind, lower frequencies can be used if the web is moving at a compatible speed.
  • the alternating voltage may have a regular sinusoidal waveform or it may have one of many other waveforms.
  • the voltage supplied to the electrode should have:
  • web cleaning apparatus according to the present invention is described with reference to a web which passes over a cylinder, the apparatus can be used equally well in an arrangement in which the web passes over a flat surface.

Landscapes

  • Cleaning In General (AREA)
  • Vehicle Body Suspensions (AREA)
  • Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
  • Fish Paste Products (AREA)
  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (12)

  1. Verfahren zum Reinigen von Bandmaterial, dadurch gekennzeichnet, daß das Band (10) durch einen Luftspalt (20) bewegt wird, der von einer ersten Fläche (12, 14), über die das Band (10) geführt wird und auf die sich das Band (10) abstützt, und von einer von der ersten Fläche (12, 14) beabstandeten zweiten Fläche (18, 19) gebildet wird, und daß über den Luftspalt (20) hinweg eine Koronaentladung erzeugt wird, die auf dem Band und daran anhaftenden Teilchen elektrostatisch wirkende Kräfte erzeugt und mindestens einige der Teilchen von der Bandoberfläche (10) ablöst, und daß die Teilchen vom Band (10) entfernt werden.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Koronaentladung durch eine Wechselstromquelle erzeugt wird.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die abgelösten Teilchen durch einen Luftstrom vom Band entfernt werden.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß der Luftstrom durch Unterdruck erzeugt wird.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß mindestens eine der beiden Flächen (12, 14; 18, 19) ein Isolator ist.
  6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Band (10) ein Isolator bildet.
  7. Bandreinigungsvorrichtung zur Verwendung bei einem Verfahren nach einem der vorhergehenden Ansprüche, gekennzeichnet durch einen Luftspalt bildende Mittel, die aus einer ersten Fläche (12, 14), über die das Band geführt wird und auf die sich das Band abstützt, und aus einer von der ersten Fläche (12, 14) beabstandeten zweiten Fläche (18, 19) bestehen, durch eine Einrichtung zur Erzeugung einer Koronaentladung im Luftspalt (20), und durch Mittel zum Entfernen von durch die Koronaentladung abgelösten Teilchen.
  8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß mindestens eine der beiden Flächen (12, 14; 18, 19) ein Isolator ist.
  9. Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß die Einrichtung zur Erzeugung der Koronaentladung eine Hochspannungs-Wechselstromquelle ist.
  10. Vorrichtung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß das Mittel zum Entfernen abgelöster Teilchen ein Hochgeschwindigkeitsluftstrom ist.
  11. Vorrichtung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß das Mittel zum Entfernen abgelöster Teilchen eine Unterdruckerzeugungsvorrichtung aufweist.
  12. Vorrichtung nach einem der Ansprüche 7 bis 11, dadurch gekennzeichnet, daß die Einrichtung zur Erzeugung der Koronaentladung mit einer Frequenz zwischen 1 und 5 kHz arbeitet.
EP91903320A 1990-02-14 1991-02-11 Vorrichtung zur reinigung vor bewegten bahnen Expired - Lifetime EP0515414B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9003283 1990-02-14
GB909003283A GB9003283D0 (en) 1990-02-14 1990-02-14 Web cleaning apparatus
PCT/EP1991/000283 WO1991012095A1 (en) 1990-02-14 1991-02-11 Web cleaning apparatus

Publications (2)

Publication Number Publication Date
EP0515414A1 EP0515414A1 (de) 1992-12-02
EP0515414B1 true EP0515414B1 (de) 1994-06-01

Family

ID=10670940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91903320A Expired - Lifetime EP0515414B1 (de) 1990-02-14 1991-02-11 Vorrichtung zur reinigung vor bewegten bahnen

Country Status (6)

Country Link
EP (1) EP0515414B1 (de)
JP (1) JPH05504297A (de)
AT (1) ATE106284T1 (de)
DE (1) DE69102266T2 (de)
GB (1) GB9003283D0 (de)
WO (1) WO1991012095A1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19525453A1 (de) * 1995-07-13 1997-01-16 Eltex Elektrostatik Gmbh Vorrichtung zum Ablösen der gasförmigen laminaren Grenzschicht
DE10018010C2 (de) * 2000-04-11 2003-10-16 Eltex Elektrostatik Gmbh Vorrichtung zum Entstauben swie deren Verwendung
DE10033839A1 (de) 2000-07-12 2002-01-24 Roland Man Druckmasch Trocknereinrichtung innerhalb einer Bogendruckmaschine
US6709623B2 (en) 2000-12-22 2004-03-23 Kimberly-Clark Worldwide, Inc. Process of and apparatus for making a nonwoven web
US7488441B2 (en) 2002-06-15 2009-02-10 Kimberly-Clark Worldwide, Inc. Use of a pulsating power supply for electrostatic charging of nonwovens
DE10236071A1 (de) * 2002-08-07 2004-02-19 Softal Electronic Erik Blumenfeld Gmbh & Co. Verfahren und Vorrichtung zur Reinigung von Oberflächen bewegter Materialbahnen
DE10255382A1 (de) 2002-11-25 2004-06-03 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Textilmaschine mit wenigstens einer Entstaubungsvorrichtung
JP5138981B2 (ja) * 2007-06-04 2013-02-06 株式会社Ｔｒｉｎｃ レベルセンサ用ホコリ除去装置
DE102014003692B3 (de) * 2014-03-13 2015-06-03 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Reinigungsgerät und Verfahren zur Reinigung
JP6402018B2 (ja) * 2014-12-15 2018-10-10 花王株式会社 不織布の製造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5216354B2 (de) * 1972-04-10 1977-05-09
DE3662992D1 (en) * 1986-04-29 1989-06-01 Eltex Elektrostatik Gmbh Dust-removing probe for moving webs, especially for paper webs
US4727614A (en) * 1987-01-20 1988-03-01 Shape Inc. Ground corona comb

Also Published As

Publication number Publication date
DE69102266T2 (de) 1995-01-05
DE69102266D1 (de) 1994-07-07
EP0515414A1 (de) 1992-12-02
GB9003283D0 (en) 1990-04-11
ATE106284T1 (de) 1994-06-15
JPH05504297A (ja) 1993-07-08
WO1991012095A1 (en) 1991-08-22

Similar Documents

Publication Publication Date Title
EP1892044B1 (de) Elektrostatischer abscheider
EP0515414B1 (de) Vorrichtung zur reinigung vor bewegten bahnen
US5421901A (en) Method and apparatus for cleaning a web
WO2007073020A1 (en) Electrostatic precipitator using induction voltage
US5066316A (en) Exhaust gas purifying apparatus
EP2424674A2 (de) Elektrostatischer filter und selbstreinigender sammelgurt dafür
US3747299A (en) Electrostatic precipitator
EP0805644B1 (de) Reinigungsvorrichtung
US20050061713A1 (en) Apparatus for the electrostatic separation of particulate mixtures
US4236900A (en) Electrostatic precipitator apparatus having an improved ion generating means
US4276056A (en) Method of removing particulate matter from precipitator plate
Dutta et al. Hybrid aerosol filtration systems—a review
JPH11319741A (ja) 除塵方法及び除塵装置
JPH0763649B2 (ja) 静電気除去装置付き空気清浄機
JPS6430663A (en) Method of removing dust from dust collecting electrode for electric precipitator
KR100566031B1 (ko) 제진 장치
KR100227127B1 (ko) 코로나 방전에 의한 정전여과포 집진방법 및 그 장치
JPH09248489A (ja) 空気清浄装置
GB2252153A (en) Removing dust from webs
KR0184228B1 (ko) 전기 집진 탈취장치
JP2000189836A (ja) 湿式電気集塵装置
EP0823283A1 (de) Elektrostatische Abscheider
KR0165072B1 (ko) 공기정화장치의 전기집진 필터
SU1311777A1 (ru) Способ регенерации коронирующих и осадительных электродов многопольного электрофильтра и устройство дл его осуществлени
FR2765502B1 (fr) Procede de nettoyage d'objets par essuyage rotatif et installation pour la mise en oeuvre du procede

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19920504

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

17Q First examination report despatched

Effective date: 19930222

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19940601

Ref country code: LI

Effective date: 19940601

Ref country code: AT

Effective date: 19940601

Ref country code: CH

Effective date: 19940601

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19940601

Ref country code: DK

Effective date: 19940601

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19940601

REF Corresponds to:

Ref document number: 106284

Country of ref document: AT

Date of ref document: 19940615

Kind code of ref document: T

REF Corresponds to:

Ref document number: 69102266

Country of ref document: DE

Date of ref document: 19940707

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19940901

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19950228

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19951231

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19960111

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19960215

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960227

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19960312

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19970211

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19970228

BERE Be: lapsed

Owner name: EASTMAN KODAK CY

Effective date: 19970228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19970901

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970211

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19971030

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19971101

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19970901

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST