• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An electrostatic blade is disclosed having a slot (16) extending the length of the blade and leading from a central duct (14) to an outlet (18). A surface (20) made of non-conductive material extends in front of the outlet (18) and terminates in a discharge edge (22) which is spaced 0.05 to 4mm from the slot outlet (18). In use, liquid is passed from the duct (14) along the slot (16) to the outlet (18) where it collects as a bead. An electrostatic field is applied between the liquid at the slot outlet (19) and the object to be coated which draws liquid along the non-conductive surface (20) in a tapering stream and further causing the liquid to be discharged from the edge (22). Because the stream of liquid reaching the discharge edge is very thin, very low liquid discharge rates can be achieved while still maintaining a uniform coating on the target object.
    公开号:SU1547697A3
    申请号:SU864028118
    申请日:1986-09-03
    公开日:1990-02-28
    发明作者:Паско Гренфелл Джулиан
    申请人:Сейл Тилней Текнолоджи Плс (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to processes and equipment for applying an electrostatic coating and can be used to apply a thin layer, for example, oil on a target object.
    The purpose of the invention is to obtain a uniform coating.
    Figure 1 shows the sectional part of the blade, a perspective view; 2 shows a 2nd embodiment of the blade, a cross section; Fig. 3 shows the 3rd embodiment of the blade, cross section; 4 shows a 4th embodiment of the blade, a cross section about
    . The blade (Fig. 1) contains the first 1 and second 2 halves with one (or several) channel 3 for the liquid located between them. The channel extends along the length of the blade and is filled with pressurized fluid from a pump (not shown). Between the first and second halves, an outlet channel 4 is provided, having a width of 120-380 microns, for example 250 microns, and passing into the outlet port 5, where the liquid coming from the channel 3 collects into the ball 6. The width of the outlet channel 4 is determined by the width 7 and may be changed by replacing the gasket with a gasket of a different thickness. The first half 1 of the blade is protruding with respect to the second half 2 of the blade and forms a surface 8 protruding with respect to the outlet 5, ending with an outlet edge 9 at the end of the first half of the blade 1.

    $ Q
    five
    The first and second halves of the blade are held together by bolts (not shown). Preferably, the arrangement is such that the first and second halves can be moved one relative to the other and fixed by bolts. Such an arrangement makes it possible to have an adjustable distance between the outlet edge 9 and the outlet 5.
    The first half of the 1 blade is made of an electrically non-conductive material, such as polymethylactylate or epoxy resin, ceramics, or any other insulating material. The second half 2 of the blade can be made of metal, for example aluminum, and connected to a high voltage source for applying an electrostatic discharge to a liquid discharged from the outlet 5.
    This embodiment of the 1st and 2nd halves of the blade forms a means for creating an electrostatic potential between the liquid at the outlet and the object, in which case the potential difference between the outlet 5 and the outlet edge 9 is created during operation.
    Alternatively, a variant (in accordance with FIGS. 2 and 3) may be presented, when the second half of the 2 blades may be made of a non-conducting material. In this case, there must be a conductive wire or strip in the outlet channel 4 to form a charge on the liquid in the outlet 5,
    51
    for example, strip 10, which is connected to a high voltage source.
    The strip 10 is embedded in the first half of the blade, which is made of a non-conductive material like the second half.
    The strip 10 may also be embedded in the second half, or the strip 10 may be embedded in both the sleeves 1 and 2 of the scapula. The strip 10 may be in a position that is shown (in FIGS. 2 and 3) or may be located farther from the outlet channel 4.
    The distance 1I between the outlet 5 and the outlet edge 9 is in the range of 0.5-4 mm.
    As shown in FIG. 1, when the second half 2 of the blade is made of an electrically non-conductive material, the first half is made with an outer coating 12 made of an electrically conductive material that functions as an electrode, which can also be represented as a plate connected to the first half 1, or may be a plate slightly spaced from the first half of the blade 1.
    When using a blade, the fluid is collected from the outlet 5 as a ball (bead) of fluid 6 and is deposited there either by forming a flat surface 13 of the second half of the blade 2 or by forming a groove 14 in the first blade 1 of the blade (Fig. 3). A strip 10 of electrically conductive material for applying an electrostatic charge to a liquid may be provided in or under the groove 14.
    The paddle shown in Fig. 4 has the first 15 and the second 16 halves, both made of aluminum, separated by a gasket 17. The liquid channel 18 extends along almost the entire length of the blade and one outlet channel 19 is provided for passing the liquid from the channel 18 to the outlet hole 20. The width of the outlet channel 19 is determined by the width of the gasket 17. A strip 21 of non-conductive material (tuff is a trademark) 1.5 mm thick is attached to the outer surface of the first half of the 15 blade and extends in such a way that the outlet edge 22 ki lies before the outlet opening 20. The distance 23 between the outlet





    0
    five
    0
    20 and
    five
    0
    the discharge edge 22 is about 2.5 mm.
    The method is carried out as follows.
    In accordance with FIGS. 1-3, liquid is supplied to the outlet 5 of the outlet channel 4 at a speed of less than 0.5 ml / cm of blade length / min, and an electrostatic field is created between the object (to which the liquid is applied, not shown) and fluid at the outlet 5 to create a gradient of tension between the outlet 5 and the outlet edge 9 of the surface 8 and direct the fluid from the outlet 5 to the outlet edge 9 of the surface 8 in a decreasing density flow.
    An electrostatic field is formed between the blade and the object to be covered, usually by keeping the object under the ground potential and charging the blade to a working potential of 50-120 kV; This potential is applied to the second half. 2, when it is made electrically conductive, or to strip 10, when the second half 2 of the blade is made of non-conducting material.

    In this case, the liquid is charged. As shown in Fig. 1, the electrostatic field stretches the liquid 23 from the outlet 5 to the outlet edge 9. The liquid stream flowing along the surface 8 rapidly decreases in thickness as it approaches the outlet edge and can actually be formed from individual streams 24 (figure 1) or can reach the outlet edge 9 as a single stream. In either case, only a small amount of liquid reaches the discharge edge, where it is sprayed. Low discharge rates of less than 0.5 ml / cm of blade length / min are achieved by forming an electrostatic field between the object and the outlet 5 and by placing a non-conductive surface 8 in front of the outlet 5 of the outlet 4.
    At a distance of 11 from graduation. edges 9 to an outlet opening 5 selected in the range of 0.5-4 mm, the fluid is directed by an electrostatic field along the surface 8 of a non-conductive material
    in the form of a conical flow to the outlet edge 9 o
    If this distance is less than 0.5 mm, then it is not enough to draw fluid into a thin stream and a low discharge rate cannot be reached. If the distance is greater than 4 mm and the blade narrows down, the flow is broken and an uneven coating J is obtained. If the blade narrows up - the flow can stop completely. The optimum distance 11 depends on the viscosity and resistivity of the oil and is 1-3 mm, for example 1 2.5 mm.
    The proposed blade is intended to coat with an oil resistance of 5x10 to 3x10 ° Om-cm, preferably from 2x 2xO7 to 8x108 Ohm-cm.
    The blade (shown in figure 4, works similarly to the blade shown in FIG. 1-3.
    The electrostatic charge is supplied to 2 liquid at the outlet 20 through the first half 15 and / or the second half 16 of the blade. The liquid collects as iric 25 at the outlet 20, but this ball is not located as far as the outlet edge 22. The liquid from the ball under the action of the electrostatic field stretches along the non-conductive surface of the strip 21 and forms a film of decreasing thickness, as a result, small exhaust rates (as described above) to the discharge edge 22 are achieved.
    权利要求:
    Claims (5)
    [1]
    1. A method of applying a liquid coating in an electrostatic field to an object, comprising: applying a liquid by means of an electrostatic covering blade having one or more channels towards the outlet and a surface protruding with respect to the outlet J wherein, in order to obtain a uniform coating, fluid is supplied to the outlet of the channel with a speed less than 0.5 ml / cm of blade length / min, and an electrostatic field is created between the volume The fluid and the fluid at the outlet to create a gradient of tension between the outlet and the outlet end of the surface and direct the fluid from the outlet to the outlet end of the surface in a stream with decreasing density.
    [2]
    2. A blade for applying a liquid coating in an electrostatic field to an object containing the first and second halves with one or several channels between them for the passage of a liquid, each of which is directed towards the outlet channel,
    and a surface protruding in relation to the outlet or apertures of the channel with an outlet edge at the end of the surface, such that in order to obtain a uniform coating with low exit speeds, the blade is provided with means for creating electrostatic potential between the fluid at the outlet the object and the surface protruding in relation to the outlet of the channel is made of a non-conducting material to create a potential difference between the outlet or the both, and the outlet edge of the surface, and the distance between the outlet or apertures and the outlet edge is in the range of 0.5-4 mm.
    [3]
    3. A blade pop, 1, about aphid h a rant and the fact that the first half of the blade is made of non-conducting material and ends with an outlet edge.
    [4]
    4. The blade according to claim 3, in which the second half is made of a non-conductive material, and the first half is made with an external coating of an electrically conductive material.
    [5]
    5. A blade according to claim 1, wherein the surface with an outlet edge protruding with respect to the outlet is formed by a plate of non-conducting material passing through the outlet.
    Priority points:
    06/03/85 - on PP. 1-4; 06 "09.85 - on p. 5,
    p- / j
    类似技术:
    公开号 | 公开日 | 专利标题
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    KR950007468B1|1995-07-11|Electrostatic spraying
    US4749125A|1988-06-07|Nozzle method and apparatus
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    Marchant et al.1982|An electrostatic charging system for hydraulic spray nozzles
    JPH02203036A|1990-08-13|Electric viscous fluid using device
    US4084019A|1978-04-11|Electrostatic coating grid and method
    GB2135908A|1984-09-12|Electrostatic sprayers
    US5332154A|1994-07-26|Shoot-up electrostatic nozzle and method
    EP0107030A2|1984-05-02|Method and apparatus for electrostatically coating objects with fluids
    FR2478490A1|1981-09-25|APPARATUS FOR ELECTROSTATIC SPRAY IN PARTICULAR ON CROPS
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    US5042723A|1991-08-27|Electrostatic spraying apparatus
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    GB1483474A|1977-08-17|Fluid resistors
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    JPS5853967A|1983-03-30|Preparation of insulating material of electric conductor and its device
    CA1286101C|1991-07-16|Electrostatic spraying apparatus
    EP1222967A2|2002-07-17|Method and apparatus for spraying a coating liquid
    RU1799295C|1993-02-28|Electrostatic atomizing device
    JPS61227869A|1986-10-09|Electrostatic coating method for plastic automobile body part
    EP0394222A1|1990-10-31|Electrostatic spraying apparatus.
    同族专利:
    公开号 | 公开日
    DE3661121D1|1988-12-15|
    EP0216502A1|1987-04-01|
    ES2001639A6|1988-06-01|
    JPH0815577B2|1996-02-21|
    KR870002874A|1987-04-13|
    DE216502T1|1987-07-23|
    JPS6257664A|1987-03-13|
    US4830872A|1989-05-16|
    EP0216502B1|1988-11-09|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2695002A|1950-06-24|1954-11-23|Ransburg Electro Coating Corp|Electrostatic atomizer of liquids|
    US2860599A|1954-08-13|1958-11-18|Binks Mfg Co|Electrostatic coating device with restricted fluid passageway opening adjacent sharpdischarge edge|
    US2782074A|1957-01-15|1957-02-19|Sedlacsik John|Electrostatic spraying apparatus|
    US3486483A|1968-08-23|1969-12-30|Richard Tilney|Electrostatic spray coating apparatus|
    DE2059594C3|1970-07-31|1973-09-20|Hajtomue Es Felvonogyar, Budapest|Device for the electrostatic dusting of dyes, powders, fibers and the like|
    IE45426B1|1976-07-15|1982-08-25|Ici Ltd|Atomisation of liquids|
    EP0122929A1|1982-10-21|1984-10-31|Sale Tilney Technology Plc|Blades for electrostatic coating, apparatuses incorporating such blades and processes using such blades|GB8609703D0|1986-04-21|1986-05-29|Ici Plc|Electrostatic spraying|
    US4749125A|1987-01-16|1988-06-07|Terronics Development Corp.|Nozzle method and apparatus|
    JP3038879B2|1989-11-21|2000-05-08|セイコーエプソン株式会社|Nozzleless inkjet recording head|
    GB8926281D0|1989-11-21|1990-01-10|Du Pont|Improvements in or relating to radiation sensitive devices|
    US5165601A|1990-04-11|1992-11-24|Terronics Development Corporation|Nozzle for low resistivity flowable material|
    EP0470712B1|1990-08-09|1995-12-13|Imperial Chemical Industries Plc|Spraying of liquids|
    US5332154A|1992-02-28|1994-07-26|Lundy And Associates|Shoot-up electrostatic nozzle and method|
    US5209410A|1992-03-05|1993-05-11|United Air Specialists, Inc.|Electrostatic dispensing nozzle assembly|
    US5326598A|1992-10-02|1994-07-05|Minnesota Mining And Manufacturing Company|Electrospray coating apparatus and process utilizing precise control of filament and mist generation|
    GB9225098D0|1992-12-01|1993-01-20|Coffee Ronald A|Charged droplet spray mixer|
    US6105571A|1992-12-22|2000-08-22|Electrosols, Ltd.|Dispensing device|
    US6880554B1|1992-12-22|2005-04-19|Battelle Memorial Institute|Dispensing device|
    US5441204A|1993-06-10|1995-08-15|United Air Specialists, Inc.|Electrostatic fluid distribution nozzle|
    GB9416581D0|1993-09-02|1994-10-12|Ici Plc|Electrostatic spraying device|
    AU690256B2|1994-03-29|1998-04-23|Electrosols Limited|Dispensing device|
    GB9410658D0|1994-05-27|1994-07-13|Electrosols Ltd|Dispensing device|
    US5503336A|1994-07-14|1996-04-02|United Air Specialists|High volume - low volume electrostatic dispensing nozzle assembly|
    US6252129B1|1996-07-23|2001-06-26|Electrosols, Ltd.|Dispensing device and method for forming material|
    US7193124B2|1997-07-22|2007-03-20|Battelle Memorial Institute|Method for forming material|
    US6422848B1|1997-03-19|2002-07-23|Nordson Corporation|Modular meltblowing die|
    GB2327895B|1997-08-08|2001-08-08|Electrosols Ltd|A dispensing device|
    US6012657A|1997-10-03|2000-01-11|Nordson Corporation|Powder spray head for fan-like patterns|
    US6368409B1|1997-11-25|2002-04-09|Nordson Corporation|Electrostatic dispensing apparatus and method|
    AU777167B2|1999-04-23|2004-10-07|Battelle Memorial Institute|Directionally controlled EHD aerosol sprayer|
    US6737113B2|2001-01-10|2004-05-18|3M Innovative Properties Company|Method for improving the uniformity of a wet coating on a substrate using pick-and-place devices|
    US6579574B2|2001-04-24|2003-06-17|3M Innovative Properties Company|Variable electrostatic spray coating apparatus and method|
    US20020192360A1|2001-04-24|2002-12-19|3M Innovative Properties Company|Electrostatic spray coating apparatus and method|
    US6534129B1|2001-10-30|2003-03-18|Nordson Corporation|Electrostatic liquid dispensing apparatus and method|
    US7045934B2|2002-04-11|2006-05-16|Ernest Geskin|Method for jet formation and the apparatus for the same|
    GB0308021D0|2003-04-07|2003-05-14|Aerstream Technology Ltd|Spray electrode|
    KR100648411B1|2003-10-17|2006-11-24|주식회사 디엠에스|Injection nozzle|
    CA2562097C|2004-04-02|2014-06-17|Wladimir Janssen|Efficient and flexible multi spray electrostatic deposition system|
    US7740350B2|2005-06-15|2010-06-22|Xerox Corporation|Printing apparatus|
    US20090297323A1|2008-05-30|2009-12-03|Genesis Worldwide Ii, Inc.|Method and apparatus for stacking sheet materials|
    FR2950545B1|2009-09-29|2012-11-30|Centre Nat Rech Scient|DEVICE AND METHOD FOR ELECTROSTATIC PROJECTION OF A LIQUID, FUEL INJECTOR INCORPORATING THIS DEVICE AND USES THEREOF|
    JP5961630B2|2011-01-19|2016-08-02|ワシントン・ユニバーシティＷａｓｈｉｎｇｔｏｎ Ｕｎｉｖｅｒｓｉｔｙ|Electrohydrodynamic spray nozzle ejecting liquid sheet|
    JP5976324B2|2012-01-05|2016-08-23|ナノミストテクノロジーズ株式会社|Electrostatic atomizer|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    GB858521835A|GB8521835D0|1985-09-03|1985-09-03|Electrostatic coating blade|
    GB858522144A|GB8522144D0|1985-09-06|1985-09-06|Electrostatic coating blade|
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