EP0237668B1 - Procédé et dispositif pour appliquer des particules refroidies électrostatiquement chargées sur la surface d'un grand article métallique - Google Patents

Procédé et dispositif pour appliquer des particules refroidies électrostatiquement chargées sur la surface d'un grand article métallique Download PDF

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Publication number
EP0237668B1
EP0237668B1 EP86304595A EP86304595A EP0237668B1 EP 0237668 B1 EP0237668 B1 EP 0237668B1 EP 86304595 A EP86304595 A EP 86304595A EP 86304595 A EP86304595 A EP 86304595A EP 0237668 B1 EP0237668 B1 EP 0237668B1
Authority
EP
European Patent Office
Prior art keywords
particles
pores
crevices
temperature
chilled
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
EP86304595A
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German (de)
English (en)
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EP0237668A1 (fr
Inventor
Reinhold Hoffman
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.)
Interlock Corp
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Interlock Corp
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Filing date
Publication date
Application filed by Interlock Corp filed Critical Interlock Corp
Publication of EP0237668A1 publication Critical patent/EP0237668A1/fr
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Publication of EP0237668B1 publication Critical patent/EP0237668B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
    • 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
    • B05B5/001—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means incorporating means for heating or cooling, e.g. the material to be sprayed
    • 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
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
    • B05D5/086—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers having an anchoring layer

Definitions

  • This invention relates to a process and apparatus for applying chilled finely divided particles to the surface of a large metal object having crevices or pores therein. More specifically, it relates to a method for chilling and applying electrostatically charged particles to such an object. Still more specifically it relates to a method of rotating and maintaining the large object at the desired raised temperature during the application of the chilled particles. Still more specifically it relates to apparatus for effecting this process.
  • U. S. Patent No. 3 279 936 issued to Clarence W. Forestek on October 18, 1966, is directed to the treating of metal surfaces having crevices or pores therein with perfluorocarbon polymer particles by air blast techniques so as to deposit such particles into the pores.
  • the metal By having the metal at a raised temperature to enlarge the pores and the particles chilled to contract them, the particles are interlocked in the pores when the particles and the metal come to an equilibrium temperature whereby the particles are expanded and the pores contracted.
  • apparatus for the application and compaction of chilled finely divided particles into the pores and crevices of a metal surface of a large object comprising a heating means for applying heat to said large object until the temperature of said metal surface is sufficient to give a desired increase in the size of said pores and crevices for receiving finely divided particles; a cooling means for chilling said particles; and a means for spraying said chilled par- tides suspended in a gaseous medium onto the said heated surface of said large object and depositing said particles into the pores and crevices in the metal surface of said large object, characterised in that the apparatus also comprises means for supporting and rotating said large object about a linear axis thereof at a controlled rate of rotation; and a charging means for applying electrostatic charges to said finely divided particles while suspended in a a gaseous medium and preferably before being chilled.
  • the application of finely divided chilled particles of perfluorocarbon polymer or graphite, molybdenum sulfate, boron nitride or other suitable electrostatically charged particles to the surface of a metal object, particularly large objects, having crevices or pores in said surface can be facilitated and more adequately effected by rotating the object on its linear axis and maintaining the object at a raised temperature while applying chilled finely divided electrostatically charged particles of perfluorocarbon, etc., onto the surface thereof.
  • the object is substantially enclosed in a hood or shield which protects heat loss from the object.
  • an inert gas such as helium, nitrogen, argon, etc.
  • the electrostatic charge applied to the particles is advantageously in the range of 50-150 kilovolts, preferably about 100kv.
  • the particles are given a positive charge and the object is given a minus potential.
  • the reverse system of charging may be used. Any appropriate means may be used for applying this charge, but a particularly advantageous device comprises a spray gun, such as used for electrostatically spraying paint which has an interior channel through which is passed the spraying medium, in this case the suspension of particles dispersed in dry air or inert gas, is mixed with a chilled gas.
  • a cooling medium such as liquid nitrogen or solid carbon dioxide is maintained in an adjacent vessel so that a chilling effect can be imparted to the gaseous suspension medium by introducing a chilled gas, preferably the same as used in the original suspension, into the suspension of electrostatically charged particles during its passage through a passageway of the chilling apparatus.
  • a chilled gas preferably the same as used in the original suspension
  • electrostatic charges Prior to the chilling of the gaseous suspending medium, electrostatic charges are applied to the particles by passing the suspension of particles through an electrical field effected by electrodes positioned in the chamber of the spray gun. Appropriate electrical charge for the electrodes is maintained by a high voltage transformer and condensers.
  • the chilled gas introduced into the suspension is desirably maintained at -20°C (-4 ° F) to -130 ° C (-202 ° F), preferably -50 ° C (-58°F) to 120°C (-184 ° F).
  • a particularly effective means is the chilling apparatus shown hereinafter for attachment to the front of a spray gun.
  • the spray gun may be any one of a number of commercial spray guns suitable for spraying electrostatically charged particles.
  • a particularly suitable spray gun is the one marketed under the trademark "GEMA" which has a four electrode and high voltage generating system including a high voltage transformer and a high voltage set of condensers.
  • the cooling attachment is fitted onto the front or spraying end of the spray gun so that as the spray of suspended electrostatically charged particles emanate from the spray gun they pass through a passageway in the chilling apparatus and out over impact spreading cone.
  • the polymer suspension stream is advantageously ejected from the spray gun at a pressure of 15-150 psi (1-10 atmosphere).
  • a suspension of particles in the suspension medium is advantageously kept in a storage tank in which the particles are stirred up by feeding in nitrogen or other gas.
  • the appropriate valve is opened to allow the gas to escape with particles suspended therein and carried to the electrostatically charging chamber of the spray gun prior to mixing with the chilling gas medium.
  • Various other means may be used to feed polymer particles into the gas stream such as Venturi, screw feed, blower, pump, etc.
  • large objects of various shapes may be treated by the process of this invention, it is particularly suitable for cylindrical objects, including large rolls 1800 millimeters (70.86 inches) or more in diameter and 2500 millimeters (98.4 inches) or more in length.
  • the object does not have end walls or support at the two ends of the cylinder or other shape, these may be affixed for the purpose of making the cylinder or other object rotatable on its linear axis.
  • a supporting axle may be affixed concentric with the linear axis and this axle driven by a motor at a controlled rate of rotation, advantageously at about 0.1 to 10 revolutions per minute, with the axle desirably resting on roller bearings.
  • a hood or other partial cover may be used to shield the object against loss of heat, and also during the spraying operation an exhausting suction may be applied under this hood to remove the gas carrying the particles as well as the remaining particles still suspended therein. The particles which fall below the object may be collected and reapplied if desired.
  • the desired temperature of the object to be treated may be attained by applying a stream of hot air under the hood and against the object as it is rotated. Infrared or other appropriate means of heating may be used if desired.
  • the hood has a slot or open area running the length of the object and parallel to the axis of the object through which the electrostatic spraying is to be effected. If desired there may be a sliding or hinged door to cover this open area when spraying is not being effected. While the object may be maintained at a temperature as low as 38 ° C (100.4 ° F), it is advantageously maintained at a temperature of about 150-180 ° C(302-356 ° F).
  • the hot air or other means of applying heat is shut off during the spraying operation after which the hood is removed and the object is allowed to cool.
  • the chilled particles have a temperature at least 55 ° C (130.5 ° F) preferably at least 165 ° C (329 ° F) below the temperature of the object.
  • a roller or cylinder one inch in thickness, 1800 millimeters (70.86 inches) in outer diameter and 2500 millimeters (98.4 inches) long, it generally takes about 12 hours for the temperature to drop from 150 ° C to 60°C.
  • a roll may be satisfactorily sprayed in about 1/2 hour with three operators applying the spray manually with hand-held spray guns.
  • a plurality of spray guns may be held on a rack which is moved, either manually or mechanically, in a path parallel to the axis of the object, the rate of such parallel movement being adjusted in accordance with the rate of rotation of the object to give complete coverage of the object's surface by the sprayed particles.
  • a stain appearance on the object's surface indicates insufficient impregnation of the crevices and pores with the particles. Spraying is continued until the stain appearance disappears. In some cases satisfactory results may be obtained with 5 complete revolutions. Preferably 20 or more revolutions produce the desired results and generally there is no additional advantage in exceeding 120 revolutions.
  • a felt strip or brush with soft rollers extending down from the hood, at a point beyond the spraying area, to the surface of the object and extending along the length of the object effects a wiping operation to brush particles into crevices and pores and also to wipe away particles on the surface of the object between the crevices and pores.
  • This wiping may be effected continuously after the spraying operation or may be done periodically. It is generally satisfactory to perform this wiping operation at least 4 or 5 or more times.
  • the spray gun or guns are advantageously held about 300-500 mm (12-20 inches) from the object being sprayed. It is generally sufficient to effect the spraying during 20-100 revolutions of the object. As indicated above, the spraying is continued or repeated until the stained appearance no longer appears after wiping.
  • the speed of the particles toward the object determined by the pressure of the suspending gas and the voltage of the electrostatic field. While it is preferred to feed the particles into the gas prior to or during passage of the gas through the spray gun, it is also contemplated that the particles may be fed into the gas stream after the gas emanates from the gun in which ase the particles will pick up the electrostatic charge on the way to the object's surface. However it is preferred to apply the electrostatic charge to the particles before chilling the particles and to effect the chilling of the particles by mixing a chilled gas with the suspension of charged particles.
  • the particles For particles of 4.7-10 gm or 5 microns in size and a voltage of about 80-100 kilovolts applied between the gun and the object it is estimated that the particles have an initial velocity of about 11 meters per second and about 0.09-0.10 meters per second in the vicinity of the workpiece. Smaller sized particles , e.g.,of less than 1 micron are more favorable since the ultimate speed due to the electrical feed will be higher than for larger particles
  • the electrostatic charge it may be advantageous to have a series of electrodes spaced in pairs alone the path of the suspended particles with a voltage of approximately 20 killivolts applied between each pair of electrodes and applied transversely to the direction of flow of the gas.
  • roll 1 is supported by axle 2 which in turn rests on bearings 3 which rotate on supporting pins 4 fastened to supporting standard 5 which has legs 7', crossbars 6 and base plates 7.
  • Axle 2 is rotated by a belt or chain 8 which is driven by a motor means (not shown) to give the desired rate of rotation to roll 1.
  • Hood 9 is positioned above roll 1 and has exhaust outlet 10. If desired the hood may extend down further to embrace a larger portion of roll 1.
  • Fig. 2 is an elevational end view of the apparatus of Fig. 1.
  • Heating means 11 is shown positioned on one side (or in back) of roll 1 with supporting means 11'.
  • the spray gun (not shown in this view) is positioned on the opposite side (or in front) of roll 1.
  • Felt or soft bristles 13 are positioned next to the roll 1 above the spray area and are held by support means 14.
  • Fig. 3 is a side elevational view of spray attachment 19 designed to effect cooling of a gas stream after applying electrostatic charges to particles suspended in the gas stream.
  • the cooling nozzle 19 is preferably made of polytetrafluoroethylene (PTFE).
  • Metal ring or band 16 slides over the exterior of a portion of the spray gun attachment 19 to hold gas entrance duct 20 in position.
  • Cold gas such as nitrogen is fed into the spray gun from cooling tank 21 which preferably consists of a rigid, expanded polyurethane foam in which a heat exchange coil 22 is positioned in cooling chamber 23.
  • the coil is advantageously made of copper tubing having a diameter of about 10 mm.
  • Cover 24 closes the chamber to reduce the admission of heat.
  • the coolant contained in the cooling chamber is advantageously either dry ice (solid carbon dioxide) or liquid nitrogen.
  • gaseous nitrogen, or other preferred gas flows through cooling coil 22 and the cooled gas (preferably at -70 - - 140°C) flows through hose connector 26 to gas entrance duct 20 attached to and communicating with the recessed portion 20' running around the circumference of attachment 19 and feeding cold gas through channels 27 into the interior of the chamber 15 of cooling attachment 19.
  • Fig. 4 is a top view of the cooling attachment 19 and spray gun 18 shown in Fig. 2.
  • Fig. 5 shows the interior structure of the cooling attachment and spray gun taken at line 5-5 of Fig. 4.
  • Nozzle 19 has a gas duct 20 which is fixed in position and is sealed by means of a metal ring 16.
  • Hose 26 (shown in Fig. 3) feeds chilled gas into gas duct 20. From duct 20 the chilled gas is passed through channels 27 into mixing channel 15 where the electrostatically charged particles are cooled down to the desired low temperature, preferably approximately - 120 ° C (-184 ° F) and then sprayed onto the roll or other large object being rotated in front of the spray gun, which object is grounded so as to attract and hold the electrostatically charged particles.
  • Conical impact plate 29 is positioned at the outlet end 30 of mixing channel 15 and can adjust the cloud of powder to the desired size by appropriate positioning of the impact plate 29 by longitudinal movement of rod 31.
  • High voltage preferably in the range of 70-120 kv is developed in generator 32 and transmitted through lines 33 into the interior of the spray gun through switch 34 to high voltage condenser cascade 35 and the through high voltage transformer 36 to electrodes 37.
  • particles of the desired size and type are stored in reservoir 38 maintained in suspended state by gas admitted by line 39 at the bottom of the reservoir from which the gas stream conveys the suspended particles through hose 40 into the spray gun where they are electrostatically charged as they pass between electrodes 37 into mixing channel 28 where the particles are chilled to the desired low temperature by mixture with the cold gas being admitted through duct 20.
  • Fig. 6 is an end view of the roll arrangement as shown in Fig. 2 except that the hood extends further around the roll by the addition of hood extension 9'.
  • the heater 11 and heater support 11' are made portable by means of wheels 41 fastened to the heater support 11' by supports 42.
  • the heat source is not shown but may electrical, e.g.,hotwire, or heat lamps, or hot air fed by flexible ducts leading into heater 11.
  • the portable spray gun (not shown) is moved into the position vacated by the heater and soft brush 13 is moved in a position above the spray gun. With the rotatable spray gun positioned on the opposite side of the roll it may be desirable to rotate the roll in the opposite direction from that shown in Fig. 2.

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Claims (12)

1. Appareil d'application et de compression de particules finement divisées et refroidies dans les pores et les crevasses d'une surface métallique d'un objet (1) de grande dimension, comprenant un dispositif de chauffage (11) destiné à appliquer de la chaleur à l'objet (1) jusqu'à ce que la température de la surface métallique suffise pour qu'elle donne l'augmentation voulue de dimension des pores et crevasses destinés à loger les particules finement divisées, un dispositif (19) de refroidissement des particules, et un dispositif de pulvérisation des particules refroidies en suspension dans un gaz vers la surface chauffée de l'objet (1) et de dépôt des particules dans les pores et crevasses de la surface métallique de cet objet, caractérisé en ce que l'appareil comporte aussi un dispositif (2, 3) destiné à supporter et faire tourner l'objet (1) de grande dimension autour d'un axe à une vitesse réglée de rotation, et un dispositif de charge (37) destiné à appliquer des charges électrostatiques aux particules finement divisées lorsqu'elles sont en suspension dans le gaz et de préférence avant leur refroidissement.
2. Appareil selon la revendication 1, caractérisé en ce que le dispositif de chauffage (11) comporte un dispositif destiné à projeter un gaz chaud contre la surface de l'objet.
3. Appareil selon la revendication 1 ou 2, comprenant une cabine (9) destinée à entourer l'objet sur une partie importante de la surface de l'objet et destinée à réduire les pertes de chaleur par l'objet.
4. Appareil selon la revendication 3, caractérisé en ce que la cabine (9) a un conduit d'évacuation (10) qui lui est connecté et par lequel le gaz du dispositif de chauffage peut sortir après avoir circuler sur une partie de l'objet de grande dimension.
5. Appareil selon l'une quelconque des revendications précédentes, comprenant un bassin de retenue destiné à entourer l'objet sur une partie importante de la face inférieure de l'objet et destiné à retenir les particules tombant de la surface de l'objet et aussi destiné à protéger l'objet contre les pertes de chaleur.
6. Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de chauffage et le dispositif de pulvérisation sont tous deux portatifs, et chaque dispositif est destiné à être mis en position adjacente à l'objet et à être écarté de l'objet après son fonctionnement, l'autre dispositif pouvant alors être mis dans la même position adjacente afin qu'il exécute son fonctionnement.
7. Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un dispositif de brossage (13) est disposé afin qu'il soit au contact de l'objet après disposition des particules pulvérisées à la surface de l'objet, si bien que le contact du dispositif de brossage avec l'objet brosse les particules dans les crevasses et les pores et retire les particules de la surface de l'objet entre les cervasses et les pores.
8. Procédé d'application et de compression de particules finement divisées et refroidies dans les pores et crevasses de la surface métallique d'un objet de grande dimension, comprenant les étapes suivantes: l'application de la chaleur à la surface de manière que des pores et crevasses aient une dimension accrue, puis, lorsque la surface est à une température d'au moins 38°C, la pulvérisation sur la surface de particules finement divisées et refroidies, en suspension dans un gaz, les particules ayant une température inférieure d'au moins 55°C à la température de la surface, caractérisé par les étapes d'entraînement en rotation de l'objet autour de son axe au cours de l'application de chaleur, la charge des particules finement divisées, et la pulvérisation pendant au moins cinq tours de l'objet.
9. Procédé selon la revendication 8, caractérisé en ce que la température de la surface est comprise entre 150 et 180°C, et la température des particules est comprise entre -50 et -120°C.
10. Procédé selon la revendication 8, caractérisé en ce que la température de la surface est au moins égale à 150°C, et les particules ont une température inférieure d'au moins 165°C à celle de la surface.
11. Procédé selon la revendication 8, 9 ou 10, caractérisé en ce que l'étendue de la surface sur laquelle les particules ont été déposées est brossée afin que les particules supplémentaires se déposent dans les pores et les crevasses et que les particules qui se trouvent à la surface entre les pores et les crevasses soient retirées.
12. Procédé selon l'une quelconque des revendications 8 à 11, caractérisé en ce que la pulvérisation est poursuivie pendant au moins vingt tours de l'objet.
EP86304595A 1986-01-23 1986-06-16 Procédé et dispositif pour appliquer des particules refroidies électrostatiquement chargées sur la surface d'un grand article métallique Expired - Lifetime EP0237668B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82180286A 1986-01-23 1986-01-23
US821802 1986-01-23

Publications (2)

Publication Number Publication Date
EP0237668A1 EP0237668A1 (fr) 1987-09-23
EP0237668B1 true EP0237668B1 (fr) 1990-06-13

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ID=25234348

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EP86304595A Expired - Lifetime EP0237668B1 (fr) 1986-01-23 1986-06-16 Procédé et dispositif pour appliquer des particules refroidies électrostatiquement chargées sur la surface d'un grand article métallique

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Country Link
EP (1) EP0237668B1 (fr)
JP (1) JPH0685896B2 (fr)
CA (1) CA1268672C (fr)
DE (1) DE3671847D1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4691865A (en) * 1986-01-23 1987-09-08 Interlock Corporation Device for chilling stream of gas-suspended particles
DE10101369A1 (de) * 2001-01-13 2002-07-18 Itw Oberflaechentechnik Gmbh Sprühverfahren und Sprühvorrichtung für Beschichtungsflüssigkeit
DE10101372A1 (de) 2001-01-13 2002-08-01 Itw Oberflaechentechnik Gmbh Sprühverfahren und Sprühvorrichtung für Beschichtungsflüssigkeit
JP2002235958A (ja) * 2001-02-09 2002-08-23 Mitsubishi Heavy Ind Ltd 空気調和機及びその制御方法
US8502157B2 (en) * 2011-09-09 2013-08-06 General Electric Company Boron containing coating for neutron detection
ITFI20120205A1 (it) * 2012-10-10 2014-04-11 Eurosider Sas Di Milli Ottavio & C Metodo e apparato per la verniciatura elettrostatica
TW201446336A (zh) * 2013-03-11 2014-12-16 Finishing Brands Holdings Inc 以靜電噴塗產生塗層之系統與方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279936A (en) * 1964-11-27 1966-10-18 Forestek Plating & Mfg Co Treating surfaces with perfluorocarbon polymers
US4051275A (en) * 1974-06-21 1977-09-27 Forestek Clarence W Embedding and compacting particles in porous surfaces

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Publication number Publication date
DE3671847D1 (de) 1990-07-19
CA1268672A (fr) 1990-05-08
CA1268672C (fr) 1990-05-08
JPS62171762A (ja) 1987-07-28
JPH0685896B2 (ja) 1994-11-02
EP0237668A1 (fr) 1987-09-23

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