EP0627267A1 - Verfahren und Vorrichtung zum thermischen Spritzen mit wärmehärtbaren Polymermaterialien - Google Patents

Verfahren und Vorrichtung zum thermischen Spritzen mit wärmehärtbaren Polymermaterialien Download PDF

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Publication number
EP0627267A1
EP0627267A1 EP94401059A EP94401059A EP0627267A1 EP 0627267 A1 EP0627267 A1 EP 0627267A1 EP 94401059 A EP94401059 A EP 94401059A EP 94401059 A EP94401059 A EP 94401059A EP 0627267 A1 EP0627267 A1 EP 0627267A1
Authority
EP
European Patent Office
Prior art keywords
gas
nozzle
ejecting
nozzles
projection
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.)
Ceased
Application number
EP94401059A
Other languages
English (en)
French (fr)
Inventor
Daniel Bathelier
Jean-Martial Leger
Gilles Cannet
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP0627267A1 publication Critical patent/EP0627267A1/de
Ceased 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
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/20—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion
    • B05B7/201—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle
    • B05B7/205—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle the material to be sprayed being originally a particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0861—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with one single jet constituted by a liquid or a mixture containing a liquid and several gas jets

Definitions

  • the present invention relates to a device for thermal spraying of plastic material comprising a spray nozzle having one end comprising a central orifice for ejecting plastic and a carrier gas, an intermediate ring of orifices for ejecting a gas. protection, and an outer ring of ejection holes of an oxy-fuel gas mixture.
  • thermoplastic polymer materials A device of this type, designed for spraying thermoplastic polymer materials, is described in document FR-A-2,671,292, in the name of the Applicant, the content of which is assumed to be incorporated here for reference.
  • the object of the present invention is to propose improvements to devices of this type allowing thermal spraying of thermosetting polymer materials up to relatively high flow rates, greater than 1 kg / hour, including with thermosetting powders which are particularly sensitive to heat, making it possible to increase the scanning width in projection and to avoid damage to the deposit made on the substrate under the effect of the heating flames of the projection nozzle.
  • the device comprises, in front of the end of the nozzle, at least one pair, facing one another, of gas ejection nozzles pinch in the direction towards the gas streams ejected by the spray nozzle.
  • the present invention also relates to a method of depositing a thermosetting polymer material on a substrate, characterized in that this deposit is carried out by thermal spraying of the thermosetting polymer material with a device as defined above, the pinch gas. typically containing at least 21% nitrogen.
  • a nozzle 1 of a thermal spray gun 2 is recognized, for example according to the document FR-A-2,671,292 mentioned above.
  • the nozzle 1 has an end face 3 in which are formed a central orifice 4 for ejecting a flow of particles of the plastic material to be projected into a carrier gas, an intermediate ring of orifices, or an annular slot 5 d ejection of a gaseous spray gas, and an outer ring of orifices 6 for ejecting an oxy-fuel gas mixture.
  • side supports 7 having rings 8 for positioning and retaining two profiled tubes 9 emanating from an upstream tube 10 connected to a source 11 gas under pressure.
  • the arms formed by the tubes 9 move away from the tube 10 and end in profiled nozzles 12 to end in an ejection orifice 13 of rectangular shape, typically in the form of a slot.
  • the two nozzles 12 are symmetrical to each other with respect to a median plane passing through the axis of symmetry of the nozzle 1, facing one of the other.
  • the ratio of the height h to the thickness e of the ejection orifice 13 is greater than 10, typically between 20 and 25, the height h corresponding substantially to the diameter of the outer ring of heating orifices 6.
  • the nozzles 12 are inclined relative to a plane parallel to the end face 3 of the nozzle at an angle ⁇ of between -20 ° and + 40 °, depending on the type of powder sprayed.
  • the angle ⁇ is + 15 ° as shown in FIG. 2.
  • the distance d between the plane of the orifices 13 and the end face 3 is also variable depending on the type of powder sprayed and is typically between approximately 15 and approximately 60 mm, the spacing E between the orifices 13 of the nozzles being greater than the diameter of the ring of orifices 6 by a determined value between 50 and 70 mm depending on the diameters.
  • thermosetting plastic material For the projection of particles of thermosetting plastic material, these are ejected, through the orifice 4, in a flow of carrier gas typically consisting of nitrogen, the inert protective gas also advantageously being nitrogen, the oxy-fuel mixture ejected by the orifices 6 being formed, in the gun 1, from a flow of oxygen and a flow of a combustible gas, for example the mixture of gaseous hydrocarbons marketed under the name "TETRENE” ® by the Applicant.
  • carrier gas typically consisting of nitrogen
  • the inert protective gas also advantageously being nitrogen
  • the oxy-fuel mixture ejected by the orifices 6 being formed, in the gun 1, from a flow of oxygen and a flow of a combustible gas, for example the mixture of gaseous hydrocarbons marketed under the name "TETRENE” ® by the Applicant.
  • the pressures and flow rates of nitrogen and of the compounds of the oxy-fuel mixture as well as the power and the temperature of the resulting flames are determined as a function of the nature of the projected thermosetting plastic material (s), which are generally chosen from the group comprising epoxy resins, unsaturated polyesters, epoxy-polyester copolymers and / or their mixtures with other plastic materials.
  • the flow of particles and carrier gas 15 ejected from the orifice 4 is separated from the ring of heating flames formed at the outlet of the orifices 6 by a sheath 17 of the protective gas.
  • the ejected pinch gas effectively causes a “pinch” of the projection plume, and more particularly of the external projection flame accompanied by dilution and cooling of the latter not appreciably affecting the central flow of heated particles on the path d .
  • the ejection of lateral pinch gas flows makes it possible to obtain high spraying rates of thermosetting powders, up to 7 kg / hour, without the powder igniting at the outlet of the nozzle.
  • the flat flow profile of the pinch flows makes it possible to increase the sweeping width in projection and thus cover a larger surface with the powder, while avoiding direct contact between the heating flames 16 and the deposit. plastic material on the substrate.
  • the pinch gas supplied with an overpressure between 0.5 and 2 x 105 Pa and at a variable flow rate between 4 and 15 m3 / hour, typically between 5 and 10 m3 / hour is air, substantially pure industrial nitrogen, or advantageously relatively nitrogen in which case the source 11 advantageously consists of a membrane air separation unit.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Nozzles (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP94401059A 1993-05-11 1994-05-11 Verfahren und Vorrichtung zum thermischen Spritzen mit wärmehärtbaren Polymermaterialien Ceased EP0627267A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9305631A FR2705040B1 (fr) 1993-05-11 1993-05-11 Procédé de projection à la flamme d'un matériau polymère thermodurcissable et substrats portant un dépôt de polymère thermodurci obtenu par projection à la flamme.
FR9305631 1993-05-11

Publications (1)

Publication Number Publication Date
EP0627267A1 true EP0627267A1 (de) 1994-12-07

Family

ID=9446993

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401059A Ceased EP0627267A1 (de) 1993-05-11 1994-05-11 Verfahren und Vorrichtung zum thermischen Spritzen mit wärmehärtbaren Polymermaterialien

Country Status (2)

Country Link
EP (1) EP0627267A1 (de)
FR (1) FR2705040B1 (de)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH127548A (de) * 1927-06-14 1928-09-01 Schoop Max Dr Ulrich Verfahren und Vorrichtung zur Herstellung von homogenen und glatten Metallüberzügen, insbesondere für graphische Zwecke.
US1998217A (en) * 1932-06-21 1935-04-16 Benoit Francois Philip Charles Apparatus for projecting molten pulverized bodies
GB2072048A (en) * 1980-03-17 1981-09-30 Eutectic Corp Flame-spray
US4384677A (en) * 1980-12-23 1983-05-24 Eutectic Corporation Nozzle construction for a gas torch
US4386112A (en) * 1981-11-02 1983-05-31 United Technologies Corporation Co-spray abrasive coating
EP0375931A2 (de) * 1988-12-28 1990-07-04 Sulzer Metco (US) Inc. Verfahren zum thermischen Aufspritzen von nicht schmelzbaren Materialien mit hoher Geschwindigkeit
US4999225A (en) * 1989-01-05 1991-03-12 The Perkin-Elmer Corporation High velocity powder thermal spray method for spraying non-meltable materials
US5148986A (en) * 1991-07-19 1992-09-22 The Perkin-Elmer Corporation High pressure thermal spray gun

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE476412A (de) * 1940-01-26
GB1122564A (en) * 1964-09-15 1968-08-07 Berk Ltd Flame spraying
FR1460625A (fr) * 1965-08-10 1966-03-04 V E B Wissenschaftlich Tech Ze Procédé pour raccorder et pour égaliser superficiellement les tôles métalliques à l'aide de couches de matières plastiques pulvérisées à la flamme
FR90646E (fr) * 1965-08-10 1968-01-19 Wtz Feikeramischen Ind Procédé pour raccorder et pour égaliser superficiellement les tôles métalliquesà l'aide de couches de matières plastiques pulvérisées à la flamme
US3962486A (en) * 1974-01-02 1976-06-08 Eppco Novel process for applying thermoset resinous coatings
GB1545611A (en) * 1976-01-02 1979-05-10 Kearns Tribune Corp Coated container apparatus and process for coating same
DE3640906C2 (de) * 1986-11-29 1995-05-24 Utp Schweismaterial Gmbh & Co Verfahren zum Aufbringen von im Ausgangszustand pulverförmigen, lösungsmittelfreien Klebstoffen
US5211990A (en) * 1991-08-01 1993-05-18 The Dow Chemical Company Polyolefin flame spraying method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH127548A (de) * 1927-06-14 1928-09-01 Schoop Max Dr Ulrich Verfahren und Vorrichtung zur Herstellung von homogenen und glatten Metallüberzügen, insbesondere für graphische Zwecke.
US1998217A (en) * 1932-06-21 1935-04-16 Benoit Francois Philip Charles Apparatus for projecting molten pulverized bodies
GB2072048A (en) * 1980-03-17 1981-09-30 Eutectic Corp Flame-spray
US4384677A (en) * 1980-12-23 1983-05-24 Eutectic Corporation Nozzle construction for a gas torch
US4386112A (en) * 1981-11-02 1983-05-31 United Technologies Corporation Co-spray abrasive coating
EP0375931A2 (de) * 1988-12-28 1990-07-04 Sulzer Metco (US) Inc. Verfahren zum thermischen Aufspritzen von nicht schmelzbaren Materialien mit hoher Geschwindigkeit
US4999225A (en) * 1989-01-05 1991-03-12 The Perkin-Elmer Corporation High velocity powder thermal spray method for spraying non-meltable materials
US5148986A (en) * 1991-07-19 1992-09-22 The Perkin-Elmer Corporation High pressure thermal spray gun

Also Published As

Publication number Publication date
FR2705040A1 (fr) 1994-11-18
FR2705040B1 (fr) 1995-06-23

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