EP2114111A1 - Brosse à décharge électrostatique amorphe - Google Patents

Brosse à décharge électrostatique amorphe Download PDF

Info

Publication number
EP2114111A1
EP2114111A1 EP08155482A EP08155482A EP2114111A1 EP 2114111 A1 EP2114111 A1 EP 2114111A1 EP 08155482 A EP08155482 A EP 08155482A EP 08155482 A EP08155482 A EP 08155482A EP 2114111 A1 EP2114111 A1 EP 2114111A1
Authority
EP
European Patent Office
Prior art keywords
esd
ribbons
brush
brush according
amorphous
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.)
Withdrawn
Application number
EP08155482A
Other languages
German (de)
English (en)
Inventor
Ben Vandenbroucke
Geert Braekevelt
Wim Van Vooren
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.)
Bekaert NV SA
Original Assignee
Bekaert NV SA
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 Bekaert NV SA filed Critical Bekaert NV SA
Priority to EP08155482A priority Critical patent/EP2114111A1/fr
Publication of EP2114111A1 publication Critical patent/EP2114111A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/02—Carrying-off electrostatic charges by means of earthing connections

Definitions

  • Static electricity generated on a product during a process can be dramatic for the process reliability or for the performance of the process and must be removed from the product.
  • Other examples, where static electricity is charged by rubbing or separating of two different materials are plastic foil processing, printing, paper and bookbinding industries, semi-conductor and office appliances such as a copier, fax, scanner and printer.
  • ESD brushes are a self-discharge type of passive static dissipation. When the product passes through/under the brush, the charges are drawn from the product by contact or by non-contact, thus dissipating the charges through the machine frame to the ground via the electrodes of the brush.
  • ESD fibres or very thin wires or filaments such as micro-wires are commonly used in ESD brush applications.
  • ESD fibres come in various compositions such as e.g. carbon, stainless steel, acrylic coated with Cu, carbon or with a metal.
  • a disadvantage of fibres is that the fibre ends are so fine that they scratch the material to be discharged when coming into contact with it. This is especially the case in e.g. the plastic foil processing industry.
  • Another disadvantage is that the fingers of the operator can get stabbed by the very fine tips of the fibres that act like needles.
  • fibres are easily bent or broken, causing decreasing discharge capacity over time.
  • US4352143 claims a device for discharging static electricity where bundles of stainless steel fibres are used as 'electrodes'.
  • JP2005285684 describes a static removal brush with a focusing wire with several metal fine wires.
  • the optimal solution to this technical problem is to provide ESD ribbon brushes of amorphous metal.
  • An amorphous metal is a metallic material with a disordered atomic-scale structure.
  • Amorphous metals are commonly referred to as “metallic glasses” or “glassy metals”.
  • metal glasses or glassy metals.
  • amorphous metals can be produced. These ways include physical vapor deposition, solid-state reaction, ion irradiation, melt spinning, and mechanical alloying. Amorphous metals produced by these techniques are, strictly speaking, not glasses; however, amorphous alloys are commonly considered to be a single class of materials, regardless of how they are prepared.
  • H. Liebermann and C. Graham developed a new method of manufacturing thin ribbons of amorphous metal on a super cooled fast-spinning wheel. This was an alloy of iron, nickel, phosphorus and boron.
  • the material known as Metglas used for low-loss power distribution transformers (Amorphous metal transformer).
  • Amorphous metal is an alloy rather than a pure metal.
  • Amorphous alloys have a variety of potentially useful properties. In particular, they tend to be stronger than crystalline alloys of similar chemical composition, and they can sustain larger reversible (“elastic") deformations than crystalline alloys.
  • Two aspects that are very advantageous for the ESD brushes of the present invention are the high strength and the resistance against breaking.
  • Amorphous metals derive their strength directly from their non-crystalline structure, which does not have any of the defects (such as dislocations) that limit the strength of crystalline alloys.
  • defects such as dislocations
  • Amorphous fibres have a high tensile strength and are, as such, very advantageous for use in ESD brushes.
  • the production of amorphous fibres is very difficult and the fibres are very expensive.
  • ribbon refers to an elongated element with a rectangular-like or elliptic cross-section.
  • the width of this cross-section is several times, i.e. at least five to ten times, the height or thickness of the cross-section.
  • the relatively small thickness allows together with the amorphous material for flexibility and a high level of repeated bending before fracture.
  • the relatively great width allows good contact with the product to be discharged.
  • the amorphous thin sheet ribbons can be obtained in mainly two ways.
  • a first way involves obtaining continuous ribbons out of the melt.
  • the long continuous ribbon is cut into ribbons of smaller length for use in an ESD brush.
  • a second way involves obtaining the thin sheet material in the form of small individual non-continuous pieces of sheet material.
  • these non-continuous pieces are also referred to as "fibres", although they are actually thin sheets of material.
  • the amorphous and nanocrystalline ribbons of the present invention are prepared by melt spinning, whereby metal is rapidly solidified by rapid cooling, resulting in very thin ribbons or metallic glass ribbons.
  • Fully amorphous alloys are obtained after melt-spinning at higher speeds (>15 m/s). Ribbons melt-spun at lower speeds consisted of a mixture of amorphous and crystalline metal.
  • a high corrosion resistance may be obtained by an alloy of Co-Fe-Cr-Br.
  • the ESD brushes of the present invention comprising the above prepared amorphous ribbons, not only have enhanced mechanical but have also enhanced electrical properties.
  • the electrical properties of these alloys are very suitable for use in ESD brushes.
  • the discharge capacity increases with increasing atomic content.
  • the nanocrystalline alloy shows the lowest discharge capacity compared to the amorphous alloys.
  • amorphous material When used in ESD brushes, amorphous material has the advantage over carbon, or other known materials, that there is less to no breakage.
  • an ESD brush for removing electric charges from flat materials comprising fully amorphous metallic material, partially amorphous metallic material or metallic material with a nanocrystalline microstructure.
  • the ESD brush comprises one or more ESD ribbons of fully amorphous metallic sheet material, partially amorphous metallic sheet material or metallic sheet material with a nanocrystalline microstructure.
  • the terms 'fully amorphous metallic material' refer to a metallic material lacking any crystalline structure, or to a material with a hardly detectable crystallinity (crystal domain size ⁇ 5 nm).
  • the terms 'partially amorphous metallic material' refer to metallic material with only here and there a crystalline structure, the majority of the metallic material remaining amorphous.
  • the terms 'nanocrystalline structure' refer to a structure where the crystal domains have a maximum dimension of 100 nm.
  • 'amorphous' refers to fully amorphous metallic material, partially amorphous metallic material or to metallic material with a nanocrystalline structure.
  • amorphous metals with following compositions have been tested by the inventors: an alloy of 88,1 Fe 11,9 Si; an alloy of 48,6 Fe 39,5 Ni 10,1 Si 1,8 Cr; and an alloy of 63 Ni 13 Cr 12 B 8 Si 4 Fe (all weight percentages).
  • the ribbons have a width smaller than 2000 ⁇ m, and preferably ranging from 100 ⁇ m to 1500 ⁇ m.
  • the ribbons have a thickness smaller than 100 ⁇ m, and preferably ranging from 15 ⁇ m to 50 ⁇ m.
  • the ribbons are held in place e.g. by clamping in a metal bracket or by fixing to one or more strips, foils or tape by an adhesive.
  • said strips, foils or tape are conductive. In another embodiment they are non-conductive.
  • the adhesive may be conductive or non-conductive.
  • the conductive strips or foil may comprise aluminium or copper or may also be made of an amorphous alloy.
  • the adhesive is conductive and the foil is copper.
  • An alternative may be a metal wire, such as a copper wire which is enclosed by the adhesive tape.
  • the ESD brush is used in a contact discharge system, such as e.g. in a printing, photocopying, faxing, scanning and bookbinding/paper industry of plastic foil industry.
  • the ESD brush is used for a non-contact discharge system, such as e.g. in the printing, photocopying, faxing, scanning bookbinding/paper or plastic foil industry.
  • the ESD brush according to the invention may comprise means for holding or installing, such as e.g. a hole at each end of the strip to connect to the device comprising the flat material to be discharged.
  • the method comprises the steps of:
  • the ESD brush is made out of one single piece of amorphous sheet metal.
  • a wide strip of amorphous sheet metal is provided as starting material. This wide strip is cut one side into smaller ribbons. This way of manufacturing is cost-effective and allows fast production. No extra conductive strip or adhesive is needed.
  • the conductive elongated element or strip is amorphous thus adding strength, elasticity and discharge properties to the ESD brush.
  • the wide strip of amorphous sheet metal may be cut at regular intervals so as to obtain a ribbon in between each cut.
  • intermediate ribbons can be left out in between other ribbons.
  • Still another way is to cut out a gap out of the wide strip so as to obtain two ribbons at a predetermined gapped distance from each other.
  • the ESD brush of the present invention is suitable for contact or non-contact type ESD brushes.
  • the ESD brush may not contact the plastic foil to avoid scratching of the electrode against the plastic foil.
  • a distance of 3 to 5 mm is recommended between the ESD brush and the plastic foil to be discharged.
  • a contact type ESD brush may be provided.
  • an ESD brush is provided optimising both contact and non-contact types.
  • the ESD brush comprises ribbons of different length. As such there is less opportunity for scratching due to less contact points, yet the discharging ability is the same or even better.
  • an ESD brush having one or more ribbons that make contact with the surface of the flat material to be discharged, and one or more ribbons that are placed for non-contact discharge, i.e. at 3-5 mm from the flat surface.
  • the few ribbons contacting the flat surface optimise discharging, while minimising the risk of scratches.
  • the non-contact ribbons further optimise discharging capacity over the entire length of the ESD brush.
  • the percentage ratio contact/non-contact ribbons may be 50-50, 40-60, 30-70, 20-80, 10-90.
  • the amorphous ribbon ESD brushes of the present invention have the following advantages: they are strong (no breakage, straightness), they are elastic (no deformation/high resilience), they are soft, they are anti-scratch (due to the flat ribbon tip), they have a good discharge capacity, they have a high conductivity, they are corrosion-resistant and they are cost-effective.
  • Figure 1 shows a cross-section of an ESD brush according to the invention.
  • Figure 2 shows a method of manufacturing an ESD brush according to the invention.
  • Figure 3a shows a picture in front and Figure 3b shows a back view of an ESD brush according to the invention.
  • Figure 4 shows an ESD brush with ribbons of different length.
  • FIG. 1 illustrates an embodiment of an ESD brush 10. Aluminium strips 12, 14 are fixed by means of an adhesive 15 to ribbons 16. At one side a paper strip 17 is attached to the aluminium strip 14 by means of a glue 18. By removing the paper strip 17, the entire ESD brush 10 can be glued to the frame of e.g. an electrical appliance.
  • An ESD brush for photocopying e.g. has a typical ribbon length of 15 mm and a brush length of 30 cm.
  • Example 1 Manufacture of ESD brushes comprising amorphous ribbons
  • ESD brushes as shown in Figure 1 may be manufactured according to Figure 2 .
  • Al-strips 12 with a non-conductive adhesive 15 are applied on a drum surface 20 in the direction of the drum axis 22.
  • Continuous ribbons 16 are wound helically with a small pitch onto the Al-strips 12 along the rotating circumference of the drum.
  • Second non-conductive adhesive Al-strips 14 are applied onto the ribbons 16 (not shown). Finally the brushes obtained in this manner are cut from the drum surface
  • additional paper strips 17 can be applied, e.g. by means of a glue 18, onto the Al-strips 14.
  • the ESD brush comprised ribbons having a width of 1 mm and a thickness 25 ⁇ m. The length of the brush was 25 mm.
  • Figure 3a and Figure 3b show a picture of an embodiment of an ESD brush 30 according to the invention.
  • FIG 4 shows an alternative embodiment of an ESD brush 40 according to the invention.
  • the ESD brush 40 comprises ribbons 16' of relatively long length for contact discharge alternated with ribbons 16" of relatively short length for non-contact discharge.
  • Example 2 ESD brushes comprising amorphous ribbons
  • Table 1 lists the different brush types that were manufactured and tested having different distance between subsequent ribbons and different length of the ribbons.
  • Table 1 Brush Id strip or foil adhesive ribbon free length distance between ribbons 1.1 Copper Conductive 1,5 cm 0,7 mm 1.2 Copper Conductive 1,5 cm 0,7 mm 2.1 Copper Conductive 1,5 cm 1 mm 2.2 Copper Conductive 1,5 cm 1 mm 3.1 Aluminium non-conductive 1,5 cm 1 mm 4.1 aluminium non-conductive 1 cm 1 mm
  • each brush was measured for five calibrated input paper voltages on two positions along the width of the paper (one third left and one third right). The average of the two positions was calculated.
  • An electrostatic charge was applied on the paper by the corona effect using a microwire. The speed of the paper was 6 m/min. The electrostatic charge on the paper was measured by a ground capacity sensor. The Al-strip making direct contact with the ribbons was grounded.
  • Table 2 represents the test results.
  • the foil material, the adhesive conductivity, the ribbon free length and the distance between the ribbons do not influence the discharge behaviour.
  • the discharge behaviour of the ribbon ESD brushes is very good since the "standard” requires a discharge from above 5 kV to below 1 kV. All ribbon ESD brushes lead to a discharge from 5,2 kV to 0,6 - 0,65 kV.
  • Fatigue tests have been performed whereby after 400.000 hits no breakage nor deformation was detected on the amorphous ribbons.

Landscapes

  • Soft Magnetic Materials (AREA)
EP08155482A 2008-04-30 2008-04-30 Brosse à décharge électrostatique amorphe Withdrawn EP2114111A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08155482A EP2114111A1 (fr) 2008-04-30 2008-04-30 Brosse à décharge électrostatique amorphe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08155482A EP2114111A1 (fr) 2008-04-30 2008-04-30 Brosse à décharge électrostatique amorphe

Publications (1)

Publication Number Publication Date
EP2114111A1 true EP2114111A1 (fr) 2009-11-04

Family

ID=39768620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08155482A Withdrawn EP2114111A1 (fr) 2008-04-30 2008-04-30 Brosse à décharge électrostatique amorphe

Country Status (1)

Country Link
EP (1) EP2114111A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013073937A1 (fr) * 2011-11-14 2013-05-23 Fuji Seal Europe B.V. Dispositif de pose de manchon et procédé permettant de disposer des manchons tubulaires autour de contenants

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757164A (en) * 1970-07-17 1973-09-04 Minnesota Mining & Mfg Neutralizing device
US4352143A (en) 1980-05-27 1982-09-28 Kenkichi Uno Device for discharging static electricity and method of producing the same
JPH06215890A (ja) * 1993-01-18 1994-08-05 Achilles Corp 除電シート及び該除電シートよりなる除電具
US20040074410A1 (en) 2000-05-17 2004-04-22 Helmut Domes Device for removing electric charges from flat materials
JP2005285684A (ja) 2004-03-30 2005-10-13 Nippon Seisen Co Ltd 除電ブラシ
JP2007200598A (ja) * 2006-01-24 2007-08-09 Achilles Corp 除電用ブラシ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757164A (en) * 1970-07-17 1973-09-04 Minnesota Mining & Mfg Neutralizing device
US4352143A (en) 1980-05-27 1982-09-28 Kenkichi Uno Device for discharging static electricity and method of producing the same
JPH06215890A (ja) * 1993-01-18 1994-08-05 Achilles Corp 除電シート及び該除電シートよりなる除電具
US20040074410A1 (en) 2000-05-17 2004-04-22 Helmut Domes Device for removing electric charges from flat materials
JP2005285684A (ja) 2004-03-30 2005-10-13 Nippon Seisen Co Ltd 除電ブラシ
JP2007200598A (ja) * 2006-01-24 2007-08-09 Achilles Corp 除電用ブラシ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013073937A1 (fr) * 2011-11-14 2013-05-23 Fuji Seal Europe B.V. Dispositif de pose de manchon et procédé permettant de disposer des manchons tubulaires autour de contenants
RU2607886C2 (ru) * 2011-11-14 2017-01-20 Фудзи Сил Интернэшнл, Инк. Устройство для нанесения рукава и способ расположения трубчатых рукавов вокруг контейнеров

Similar Documents

Publication Publication Date Title
JP6054085B2 (ja) 曲げ加工後のばね限界値特性及び耐疲労特性に優れたＣｕ−Ｍｇ−Ｐ系銅合金板及びその製造方法
CN110869525B (zh) 包覆电线及附带端子的电线
CN112640574B (zh) 带导电片的物品及其制造方法
CN112602376B (zh) 片状导电构件
EP3196257B1 (fr) Composition conductrice et feuille conductrice comprenant celle-ci
CN103502486A (zh) 具有优异的耐疲劳特性的Cu-Mg-P系铜合金板及其制造方法
WO2021192775A1 (fr) Feuille de câblage et élément chauffant du type feuille
EP2114111A1 (fr) Brosse à décharge électrostatique amorphe
TWI874622B (zh) 片狀導電構件及片狀加熱器
CN1989017B (zh) 环状同心放置的胎边绳及其制造方法
EP0766268A2 (fr) Câble électrique résistant à haute tension, du type à bobine et à suppression des bruits
WO2017086487A1 (fr) Procédé de fabrication de feuille
CN117545869A (zh) 电气特性测试用导线及其制造方法
CN116326203B (zh) 布线片及布线片的制造方法
JP2018181680A (ja) 除電体
JP2008248325A (ja) 高強度高導電性耐熱銅合金箔
JP4872688B2 (ja) 導電糸
JP4962832B2 (ja) 除電ブラシ電極用材料
JP4418279B2 (ja) 除電ブラシ
US10586626B2 (en) Copper alloy wire rod
KR102922322B1 (ko) 배선 시트 및 시트상 히터
CN115299177B (zh) 拟片材构造体、片状导电部件以及传感器装置
CN105102180A (zh) 用于电火花加工的金属丝电极
JP4744308B2 (ja) 除電用ブラシ
JP7316760B2 (ja) カーボンナノチューブ線材

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

RIN1 Information on inventor provided before grant (corrected)

Inventor name: VAN VOOREN, WIM

Inventor name: BRAEKEVELT, GEERT

Inventor name: VANDENBROUCKE, BEN

AKX Designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20100505