US3208868A - Method and apparatus for coating articles with particulate material - Google Patents

Method and apparatus for coating articles with particulate material Download PDF

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Publication number
US3208868A
US3208868A US80828A US8082861A US3208868A US 3208868 A US3208868 A US 3208868A US 80828 A US80828 A US 80828A US 8082861 A US8082861 A US 8082861A US 3208868 A US3208868 A US 3208868A
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United States
Prior art keywords
particles
coating
pipe
chamber
article
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US80828A
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English (en)
Inventor
Rupert F Strobel
Backlund Sven
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3M Co
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Minnesota Mining and Manufacturing Co
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Publication date
Priority to NL131679D priority Critical patent/NL131679C/xx
Priority to NL273178D priority patent/NL273178A/xx
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Priority to US80828A priority patent/US3208868A/en
Priority to FR883825A priority patent/FR1309661A/fr
Priority to DE19621427625 priority patent/DE1427625A1/de
Priority to GB528/62A priority patent/GB976327A/en
Priority to BE612347A priority patent/BE612347A/fr
Application granted granted Critical
Publication of US3208868A publication Critical patent/US3208868A/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
    • B29C63/04—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like
    • B29C63/08—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like by winding helically
    • B29C63/10—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like by winding helically around tubular articles
    • B29C63/105—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like by winding helically around tubular articles continuously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0207—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe
    • B05B13/0214—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe the liquid or other fluent material being applied to the whole periphery of the cross section of the elongated body
    • 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
    • B05B5/14—Plant for applying liquids or other fluent materials to objects specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes

Definitions

  • the coating apparatus of the invention in its preferred embodiment, is designed so as to permit articles to be passed through a mist of dust-like coating material in a continuous manner while suspended free of contact with any part of the apparatus forming the coating zone. No seals are required at the inlet or exit ports of the coating zone; and yet escape of dust particles from the zone may be entirely prevented.
  • the apparatus is particularly useful for continuous coating of elongated articles such as pipes, angle irons, structural members such as those required in bridge construction, and flat articles or even small parts.
  • thermoadhesive materials such as spray coating or fluidized bed coating
  • Known methods generally require that the article first be heated to a temperature at which the solid thermoadhesive particles used in coating will coalesce and fuse upon the surface of the article.
  • These existing methods suffer from several disadvantages. Ordinary spray gun application of thermoadhesive particles upon a pre-heated article creates dust problems.
  • This invention obviates problems such as mentioned in the foregoing paragraph and permits continuous rapid coating of articles with a uniformly-thick layer of coating material on all surfaces thereof without the necessity of rotating the article during its passage through the 3,208,868 Patented Sept. 28, 1965 coating zone. Rotation of the article thus becomes optional.
  • the coating zone is defined by the flow of the dust material itself, and not by seals at ingress and egress ports of a coating chamber as conventionally used.
  • the preferred embodiment of the coating apparatus of the instant invention is so designed that more than one zone of intense coating is created where particles are applied as a uniformly-thick film or layer upon all surfaces of an article passing through the apparatus.
  • FIGURE 1 is a schematic representation of the association of various elements of apparatus particularly useful for coating long articles such as pipe, with the coater itself illustrated in sectional elevation;
  • FIGURE 2 is a schematic perspjective view of the coated partially broken away to illustrate a portion of the interior
  • FIGURE 3 is a schematic illustration of a conduit system for control of the flow of dust particles through the coating chamber
  • FIGURE 4 is a schematic diagrammatic view, with conduits represented by dash lines, illustrating the path of flow of particles in a continuous manner through the coating chamber (end view) and the unit (side view) for controlling the flow of the particles; and
  • FIGURE 5 is a schematic representation of spirally overwrapping a rotating coated article, such as a pipe, with a strip of sheet material.
  • FIGURE 1 the over-all operation of coating articles, e.g., pipe, with a protective resin layer, using the apparatus and materials handling method of the invention will be described.
  • Two lengths of pipe 10 and 11, joined together by double cone coupler 12, are moved from left to right in FIGURE 1, by a drive unit A of conventional manufacture.
  • External surfaces of the pipe to be coated are subjected to a cleaning action (e.g., sandblasting) in cleaner B, also of conventional manufacture.
  • a cleaning action e.g., sandblasting
  • the pipe passes through a heater C, where the temperature of the pipe is raised above the lowest temperature at which the dust-like or pulverulent thermoadhesive material used in coating is fused, but no higher than the temperature at which the pulverulent material decomposes on contact with the heated pipe in coater D.
  • the pre-heat temperature employed may desirably be such that adequate heat is introduced into the pipe and therefore available to effect the rapid thermosetting of such thermoadhesive particles without need for subsequent auxiliary heat. This concept will be explained further in detail below.
  • the pipe is passed into the coater D, as this arrangement permits of maximum control of the temperature of the pipe (or other article to be coated) as it passes through coater D.
  • induction heating of articles to be coated may be accomplished essentially within the area where coating with the thermoadhesive particles is done.
  • the particular expedient employed to gain proper article heating for coalescence and even thermosetting of pulverulent thermoadhesive materials in coating may vary, as will be evident to those skilled in the art.
  • thermoadhesive contacting the heated pipe adhere to its surfaces and coalesce to form an essentially uniformly-thick coating which, when preferred thermosetting pulverulent particles are employed with appropriate pre-heating of the article to be coated, autogenously thermosets in situ.
  • the pipe After leaving coater D, the pipe preferably is free of any supporting means for a short distance, the time 'for traversing that distance preferably being just sufficient for the thermosetting action of coalesced thermoadhesive particles especially designed to rapidly cure at elevated temperatures, or just suificient to allow 'non-therm'osetting particles to cool adequately to a non-tacky state after coalescence and fusion.
  • the distance that the coated article traverse after leaving the coater without being contacted on is coated surface by any supporting element may vary; and if desired, the coated article may be passed through a cooler E prior to being contacted on its coated surface with any elements such as a support member F.
  • the coated article may be passed centrally through a circular electrode as it emerges from the coating zone of the coating chamber.
  • a circular conducting member having inwardly projecting conductive needles (i.e., electrodes).
  • the coated article is grounded and passed centrally through this circular member, free of contact with the inwardly projecting needles; and the voltage applied to the circular member with its inwardly projecting electrodes is su'fiicient to form an intense electrical field with corona discharge from the needle electrodes to the article, such as pipe, passing through the field.
  • the air in the field breaks down and an arc discharge occurs.
  • the are discharge may be used to actuate, in timed relationship, one or more of several spray guns spaced concentrically about the path of travel of the coated article.
  • a spray of patching thermoadhesive particles may be applied to repair any defect promptly, if such were ever to become necessary.
  • the voltage applied to the needle electrodes may vary depending on spacing from the coated article, thickness of coating desired to be maintained, etc. Illustratively, one may use about 11,000 to 16,000 volts at a one-half inch air gap for many pipe coating operations.
  • this coater comprises two annular manifolds 13 and 14 which terminate in (i.e., are joined with) annular orifices.
  • the annular orifice defined by ring members 15 and 16 is for annular manifold 13; and that defined by ring members 17 and 18 for annular manifold 14.
  • Each ring member amounts to a section through a cone, with the cooperating ring members that form each annular outlet converging toward that outlet, thus in effect creating a jet outlet for material introduced in each manifold.
  • the cone from which internal ring members 16 and 18 are taken as a section may suitably be one having an angle of approximately 70 from its sides'to its axis, whereas the cone from which external ring members 15 and 17 are taken as a section preferably is one having an angle of approximately 45 from its sides to its axis.
  • these specific angles for the ring members may be varied considerably, the critical requirement being that the cooperating ring members forming the annular orifice for each annular manifold must converge'toward that annular outlet so as to create a jet emergence of coating material therefrom.
  • each annular orifice is in spaced stacked or non-abutting relationship to each other, with the ring member from the more pointed cone and thus the one having the sharper conical angle (i.e., smaller angle from axis to sides) located with its innermost terminus pointing toward the apex of the cone of the ring member possessing the flatter conical design.
  • an annular outlet is formed which serves to direct powdered materials emerging therefrom toward the apex of a cone, the slope of which is a compromise between the slopes of the ring members between which the material emerged.
  • the angle of emergence of dust material from the annular orifices with respect to the path of articles moving through the coater is an acute angle, with its apex directed inwardly toward the coating zone. Emerging dust material from each annular orifice is thus centripetally directed inwardly of the entrance and exit openings in the coating chamber; and articles to be coated are passed essentially through the confluence of each cone of 'centripetally directed particles.
  • an enclosed chamber 19 which for convenience maybe referred to as a vacuum zone, since the pressure in this zone is maintained at a slightly reduced level (e:g., an inch of water below normal air pressure) ascompared to environmental pressure outside the coater.
  • Each manifold of the apparatus is fed with pulverulent material through a plurality of conduits 20, preferably equidistantly spaced annularly about each annular manifold.
  • Three such feed conduits for each manifold serve quite satisfactorily.
  • About the vacuum chamber (between the manifolds illustrated in the drawings) are spaced a plurality of exit ports connected with conduits 21 for removal of air within the vacuum chamber and concomitant removal of excess pulverulent material not adhered to objects passing through the chamber.
  • the conduits to and from the coater are terminated a short distance from the coater.
  • conduits 21 for removal of air and excess dust material from the vacuum chamber are merged into a single larger conduit 22 connected intermediate its ends with a'filtered vacuum pump G (graphicallyillustrated) for removal of air and collection of any dustlike particles entrained with .that air.
  • a fan H which serves also to draw air from the vacuum chamber of the coater.
  • a conduit 23 for the introduction of additional pulverulent material into the system. From blower fan H, material is thrown through conduit 24 which divides into a multiple set of individual conduits 20 for feeding thepulverulent material into manifolds 13 and 14.
  • thermoadhesive coating materials e.g., epoxies, phenolics, polyethylenes, etc.
  • thermoadhesive particles such as inorganic enamel frit particles may be employed.
  • thermoadhesive particles refers to particles which fuse together on heating and remain so fused after cooling. Such peraticl-es may or may not also exhibit thermosetting properties.
  • thermoadhesive particles which also are extraordinarily rapid in their ability to thermoset or cure within seconds at elevated temperatures, are those wherein each particle comprises a uniform blend of epoxy resin, latent heat-activatible epoxyreactive hardener and accelerators or catalysts for the reaction between the epoxy resin and hardener.
  • thermoadhesive particles A useful illustrative formulation for this type of rapidly-reactive epoxy resin thermoadhesive particles, remaining stable for long periods at room temperatures or even slightly higher temperatures, is as follows: 591.4 parts of solid epoxy resin (equal parts of Epon 1001 and Epon 1002), 51 parts of isophthalyl dihydrazide, 10 parts of dicyandiamide, 2.3 parts of tris(dimethylaminomethyl) phenol, 5.3 parts of alkyl ammonium bentonite (Bentone-38), 350 parts of finely divided mica filler, and 10 parts of chrome oxide pigment.
  • the particles of this resin mix should pass through a 40 mesh screen; and they may be as small as 200 mesh, or even smaller (e.g., minus 325 mesh). Particles of about 80 mesh or smaller are preferred.
  • the particles of this composition melt or fuse at about 300 F., and within a minute or so after fusing at this temperature, the mass gells and cures to thermoset infusible state.
  • the particles of this composition melt, fuse and cure to a thermoset infusible state within seconds.
  • the coater of the invention is particularly useful in the application of thermoadhesive particles as a uniform coating on appropriately heated articles, usually, but not necessarily, of metal.
  • organic filler dusts e.g. wood flour
  • inorganic grit or other particulate material eg talc
  • particulate may be applied over a previously applied thermoadhesive layer by using, for example, a coating orifice (i.e., the annular coating means) of the invention.
  • the coater of the invention may be used to apply non-thermoadhesive particulate material over a tacky substrate article (or a tacky coating on an article), whether 6 tackification is gained by heating or is exhibited under normal room temperature conditions.
  • Different layers of material e.g., a thermoadhesive coating, followed by a coating of grit particles
  • pipe or like articles may further be wrapped with paper or other strip material after they are coated.
  • Such wrapping is conventiently accomplished by rotating the pipe 11 during the coating operation and spirally applying the strip material 25 as the rotating coated pipe emerges from the coater, as illustrated in FIGURE 5.
  • vibration of the coater during the coating operation serves as a desirable adjunct to air and powder flow to obviate clogging of the apparatus.
  • the coater of the instant invention may comprise a single or a plurality of manifolds and accompanying annular orifices in linear arrangement, with vacuum zones as described associated therewith. It will also be evident that the essential attributes of annular orifices as described may be gained by elliptical as well as circular members. Distorted shapes of myraid configuration may be designed to give equivalent results; and such, of course, is comprehended by the claims.
  • Apparatus for coating articles comprising a chamber having a port therein defined by substantially annular means to discharge a substantially continuous centripetal jet curtain of solid particles upon an article passed through said port in the confluence of said discharged particles, manifold means for essentially uniformly distributing said particles prior to discharge of the same through said annular means, a plurality of supply conduits for delivering particles to said manifold means, a plurality of exhaust conduits for removing air from said chamber as well as air-entrained particles exceeding the quantity of particles employed in the coating operation Within said chamber, said exhaust conduits being connected to exhaust means suflicient to create a reduced pressure within said chamber as compared to environ mental pressure outside said chamber, thereby to effect a flow of external air through said port into said chamber for obstructing escape of said discharged particles outwardly of said port, and means connecting said exhaust conduits to said supply conduits to thereby provide an enclosed continuous path permitting flow of particles into and out of said chamber.
  • Apparatus for coating articles comprising a cylindrical chamber having a port at one end thereof defined by substantially annular means to discharge a substantially continuous centripetal jet curtain of solid particles upon articles in the confluence of said discharged particles, manifold means for essentially uniformly distributing said particles prior to discharge of the same through said annular means, a plurality of supply conduits for delivering particles to said manifold means, exhaust means to create a zone of reduced pressure inwardly of said port, and means to move articles through said discharged particles for coating.
  • Apparatus for coating articles comprising a chamber having entrance and exit ports, each defined by substantially annular means for discharging a substantially continuous centripetal jet curtain of solid particles inwardly into said chamber, a plurality of supply conduits for feeding particles to, each of said substantially annular mean said supp y nduit eing conn e t s anial y equ distant annu a spa n to ai s bs a y nnular mean nd a Withdr a m an eff i to n.- t n y xcess of d scha g d par icles not mpl y d r coating an article as it passes through said chamber and remove said entrained particles from said chamber.
  • Apparatus for coating articles comprising a substantially cylindrical chamber having an entrance port and an exit port lineally aligned, each of said ports being defined y ubs a ally n lar mea s f rg g a substantially continuous centripetal jet curtain of solid particles inwardly into said chamber, a plurality of supply on uits o f ed n Pa cl s to eac f s d s tially annular means, said supply conduits being connected at substantially equidistant annular spacing to said substantially annular means, and each of said ports being associated with means to create a reduced pressure inwardly of the same within said chamber as compared to environmental pressure outside said chamber, thereby to effect a flow of external air through the same into said chamber for obstructing escape of said discharged particles outwardly from said ports.
  • Apparatus for coating articles comprising a chamber having an entrance port and an exit port, each of said ports being defined by substantially annular means for discharging a substantially continuous centripetal jet curtain of solid particles conically into said chamber, a plurality of supply conduits for. feeding particles to each of said substantially annular means, said supply conduits being connected at substantially equidistant annular spacing to said substantially annular means, means to create a reduced pressure within said chamber as compared to environmental pressure outside said chamber and thereby elfect a flow of external air through each of said ports into said cham ber for obstructing escape of said discharged particles outwardly from said ports, and means to move articles essentially through the confluence of the particles discharged by the annular means at each of said ports.
  • Apparatus for coating articles comprising a chamber having entrance and exit ports, each defined by substantially annular means for discharging a substantially continuous centripetal jet curtain of particlesupon articles passed through each said port in the confluence of said said discharge particles, a plurality of suPPly conduits for feeding particles to each of said substantially annular means, said supply conduits being connected at substantially equidistant annular spacing to said substantially annular means, means to move articles through said discharged particles for coating, air Withdrawal means effective to entrain and remove any excess of said discharged particles within said chamber not employed for coating an article as it passes through said chamber, and means to recirculate said removed particles to said coating chamber. 7
  • Apparatus for coating articles comprising a chamber having a port therein defined by substantially annular means for discharging a substantially continuous centripetal jet curtain of solid particles upon an article passed through said port in the confluence of said discharged particles, a plurality of supply conduits for feeding particles to each of said substantially annular means, said supply conduits being connected at substantially equidistant annular spacing to said substantially annular means, means to create a reduced pressure within said chamber as compared to environmental pressure outside said chamber andthereby effect a flow of external air through said port into said chamber for obstructing escape of said discharged particles outwardly from said port, and air flow means to remove any excess of discharged particles from said chamber and re-introduce them through said annular means.
  • thermoset adhesive coating comprising the steps of heating the article to a temperature above the softening temperature of a solid thermosettable thermoadhesive material in particulate form, forming a substantially conical centripetal jet curtain of particles of said solid thermosettable thermoadhesive material in a gaseous stream, passing the article along the major axis of the conical centripetal jet curtain of solid thermosettable thermoadhesive particles and through the confluence of said centripetal jet curtain of said particles while the temperature of the article is above the softening point of said particles, whereby the particles of said solid thermosettable thermoadhesive material striking said heated article fuse togetherinto a continuous coating, and heat-curing said coating to a the m s c nd i n.-
  • thermoadhesive material to be applied as a layer upon the article, forming a substantially conical centripetal jet curtain of particles of said thermoadhesive material in a gaseous stream, passing the article While rotating the same along the major axis of said conical centripetal jet curtain of said particles and through the confluence of said centripetal jet curtain of said particles while the temperature of the article is above the softening point of said particles, thereby to effect deposit and fusion of thermoadhesive particles upon surfaces of said heated article, and then spirally overwrapping said rotating coated article with a strip of sheet material.
  • the method of coating non-thermoadhesive particulate material on an article comprising the steps of tackifying at least those surface portions of said article to be subsequently coated with said non-thermoadhesive particulate material, forming a substantially conical centripetal jet curtain of said non-thermoadhesive particulate material in a gaseous stream, and passing the article along the major axis of said conical centripetal jet curtain of said non-thermoadhesive particulate material and through the confluence of said centripetal jet curtain of said nonthermoadhesive particulate material for coating.
  • thermoadhesive material to be applied as a layer upon the article, forming a substantially conical centripetal jet curtain of said particles of thermoadhesive material in a gaseous stream, passing the article in aligned longitudinal condition along the major axis of said conical centripetal jet curtain of said particles and through the confluence of said centripetal jet curtain of said particles while the temperature of the article is above the softening temperature of said particles, thereby to effect deposit and fusion of said thermoadhesive particles upon surfaces of said heated article.
  • the method of providing a metal pipe with a continuous resinous coating formed from discrete solid thermoadhesive particles comprising the steps of heating the article to a temperature above the softening tempera,- ture of said solid thermoadhesive particles, forming at least one substantially conical centripetal jet curtain of airborne particles of said solid thermoadhesive material, passing said pipe in aligned longitudinal condition along the major axis of said conical centripetal jet curtain of said particles and through the confluence of said centripetal jet curtain while maintaining the temperature of said pipe above the softening point of said particles and while simultaneously exhausting from the vicinity of said pipe those particles not adhering to said pipe, said conditions of movement of said pipe through said curtain of particles being such as to cause sufiicent of said particles to adhere to said pipe to form a continuous coalesced resinous. coating thereon.
  • Apparatus for coating metal pipe comprising an elongated coating chamber open at ,opposite ends for movement of pipe longitudinally therethrough, exhaust means connected to said chamber through conduit connections intermediate the ends of said chamber, said exhaust means being sufficient to efiect an inward flow of external air through the openings at opposite ends of said chamber, a plurality of supply condutis with annularlyflared discharged openings connected to said apparatus annularly about at least one open end of said coating chamber, whereby air-entrained solid thermoadhesive particles forced through said supply conduits are discharged in a substantially continuous annular converging centripetal jet curtain into said chamber and toward said exhaust conduit connections, blower means to force airentrained solid thermoadhesive particles through supply conduits of said apparatus, means externally to said chamber to effect movement of pipe through one open end of said chamber and out the other without causing contact between coated surfaces of said pipe and said chamber, and means to re-introduce into said chamber through said supply conduits those thermoadhesive particles removed from said
  • Apparatus for coating metal pipe comprising an elongated coating chamber open at opposite ends for movement of pipe longitudinally therethrough, exhaust means connected to said chamber through conduit connections intermediate the ends of said chamber, said exhaust means being suflicient to effect an inward flow of external air through the openings at opposite ends of said chamber, a plurality of supply conduits with annularlyflared discharge openings connected to said apparatus annularly about one open end of said chamber, whereby air-entrained solid thermoadhesive particles forced through said supply conduits are discharged in a substantially continuous annular converging centripetal jet curtain into said chamber and toward said exhaust conduit connections, plural supply conduits connected to said apparatus annularly about the other open end of said chamber for feeding air-entrained solid thermoadhesive particles for discharge into said chamber, blower means to force air-entrained solid thermoadhesive particles through supply conduits of said apparatus, means externally to said chamber to effect movement of pipe through one open end of said chamber and out the other without causing contact between coated surfaces of said pipe and said

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
US80828A 1961-01-05 1961-01-05 Method and apparatus for coating articles with particulate material Expired - Lifetime US3208868A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL131679D NL131679C (de) 1961-01-05
NL273178D NL273178A (de) 1961-01-05
US80828A US3208868A (en) 1961-01-05 1961-01-05 Method and apparatus for coating articles with particulate material
FR883825A FR1309661A (fr) 1961-01-05 1962-01-04 Procédé et dispositif pour la projection de matériaux en poudre
DE19621427625 DE1427625A1 (de) 1961-01-05 1962-01-04 Behandeln von Stoffen
GB528/62A GB976327A (en) 1961-01-05 1962-01-05 A method and apparatus for coating articles
BE612347A BE612347A (fr) 1961-01-05 1962-01-05 Appareil et procédé de traitement et de manipulation de matériaux.

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US80828A US3208868A (en) 1961-01-05 1961-01-05 Method and apparatus for coating articles with particulate material

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US3208868A true US3208868A (en) 1965-09-28

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US80828A Expired - Lifetime US3208868A (en) 1961-01-05 1961-01-05 Method and apparatus for coating articles with particulate material

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US (1) US3208868A (de)
BE (1) BE612347A (de)
DE (1) DE1427625A1 (de)
FR (1) FR1309661A (de)
GB (1) GB976327A (de)
NL (2) NL131679C (de)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3299853A (en) * 1964-01-16 1967-01-24 Amsted Ind Inc Apparatus for coating elongated objects
US3409456A (en) * 1963-12-04 1968-11-05 Mansfield Sanitary Inc Method and apparatus for dusting mold cores
US3443984A (en) * 1964-03-27 1969-05-13 Martin Sweets Co Inc The Method of coating tubular object with polyurethane foam
US3453134A (en) * 1966-03-03 1969-07-01 Banister Corp Electrostatic pipe coating method and apparatus
US3476081A (en) * 1964-03-25 1969-11-04 United States Steel Corp Fluidizing chamber
US3486921A (en) * 1965-11-12 1969-12-30 Neil R Wallis Method for applying powder coatings to articles
US3508946A (en) * 1964-04-09 1970-04-28 Dow Corning Pipe coated with epoxy resin composition cured with extra-coordinate silicon complex and process for coating said pipe
US3526027A (en) * 1967-05-29 1970-09-01 Continental Can Co Apparatus for coating side seam areas of containers
US3602288A (en) * 1968-06-25 1971-08-31 Howmet Corp Apparatus for manufacture of refractory shell molds
US3688737A (en) * 1969-11-04 1972-09-05 Glass Container Mfg Inst Inc Vapor deposition apparatus including air mask
US3853581A (en) * 1972-06-02 1974-12-10 Air Ind Method of coating articles with electrostatically charged particles
US3869300A (en) * 1970-10-24 1975-03-04 Metallgesellschaft Ag Method of internally coating ducts with synthetic resin
US3904930A (en) * 1974-04-17 1975-09-09 Estey Dynamics Corp Automatic powder spray apparatus and method for spraying the inside surfaces of containers
US3946125A (en) * 1970-10-24 1976-03-23 Metallgesellschaft Aktiengesellschaft Method for internally coating ducts with synthetic resin
US3968288A (en) * 1974-10-16 1976-07-06 Armstrong Cork Company Method of producing embossed, two-colored surface on fibrous board product and product produced thereby
US4034703A (en) * 1975-09-25 1977-07-12 Metallgesellschaft Aktiengesellschaft Apparatus for externally coating endless metal tubing and like elongated metal members
US4127815A (en) * 1974-05-20 1978-11-28 Republic Steel Corporation Method and apparatus for marking an article following flaw detection using a fusible metal powder
US4237817A (en) * 1979-03-23 1980-12-09 Commercial Resins Company Apparatus for spraying powder circumferentially around a pipe joint
US4263871A (en) * 1978-01-04 1981-04-28 Gibson Jack Edward Apparatus for powder coating sucker rod
US4397702A (en) * 1980-01-09 1983-08-09 Johnson Controls, Inc. Fabrication of non-conductive charged sensing probe unit
US4749593A (en) * 1985-02-21 1988-06-07 Prazisions-Werkzeuge Ag Coating arrangement and process for preventing deposits of a coating material
US4752497A (en) * 1983-08-25 1988-06-21 Shaw Industries Ltd. Method of applying an impact resistant moisture impermeable resinous coating
US5107789A (en) * 1989-02-01 1992-04-28 Blodgett & Blodgett, P.C. Article coating system
FR2698952A1 (fr) * 1992-12-09 1994-06-10 Gts Isopipe Procédé et dispositif pour revêtir d'une enveloppe isolante un tube et tube obtenu par ce procédé.
WO2001089710A3 (en) * 2000-05-20 2002-03-14 John W Betteridge Apparatus and method for coating the exterior surface of a pipe
EP2253384A1 (de) * 2009-05-18 2010-11-24 Delle Vedove Deutschland GmBh Beschichtungsvorrichtung für langgestreckte Werkstücke
US20110159192A1 (en) * 2007-08-17 2011-06-30 Pipeline Induction Heat Limited Apparatus for coating pipes
US20120094031A1 (en) * 2009-05-22 2012-04-19 Durr Systems Gmbh Method and coating plant for providing a workpiece with a coating
US8535752B2 (en) 2010-10-20 2013-09-17 L&P Property Management Company Automated powder-coating method
CN113499919A (zh) * 2021-07-20 2021-10-15 黑龙江北方工具有限公司 一种风帽喷涂烘干装置及方法
WO2022110732A1 (zh) * 2020-11-27 2022-06-02 常州船用电缆有限责任公司 电缆喷涂设备
CN116160676A (zh) * 2023-04-06 2023-05-26 河北聚丰华春保温材料有限公司 一种管道防腐胶带的喷涂缠绕装置

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JPS59177164A (ja) * 1983-03-21 1984-10-06 ジ−グフリ−ト・フライ 円筒形の缶の本体の溶接継目上に条片状の粉末の層を付着させる方法と装置
ITGE20060031A1 (it) 2006-03-08 2007-09-09 Socotherm S P A Metodo di rivestimento anticorrosione e termoisolante di corpi tubolari e di condotte di trasporto di fluidi ed apparato per l'attuazione di tale metodo.
DE102014116502A1 (de) * 2014-11-06 2016-06-09 Jens Werner Kipp Profilbearbeitungsvorrichtung
CN113426617A (zh) * 2021-07-20 2021-09-24 佛山市南海雷纳铝业有限公司 一种用于铝塑板生产的涂装装置
CN115382688B (zh) * 2022-08-30 2023-06-16 安徽紫朔环境工程技术有限公司 一种涂覆于陶瓷滤管的脱硝催化剂浆液及其涂覆设备

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US1263858A (en) * 1917-12-27 1918-04-23 William L Cole Apparatus for applying coatings to bars, rods, pipes, &c.
US1682823A (en) * 1927-08-26 1928-09-04 Sterling Varnish Company Coating apparatus
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US2380968A (en) * 1944-03-28 1945-08-07 Continental Can Co Apparatus for degreasing containers
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US2880109A (en) * 1955-09-22 1959-03-31 United States Steel Corp Method of coating the interior of cylinders
US2988641A (en) * 1957-01-28 1961-06-13 Dunlop Rubber Co Production of sheet materials
US3004861A (en) * 1956-01-12 1961-10-17 Polymer Corp Methods and apparatus for applying protective coatings
US3065350A (en) * 1959-03-09 1962-11-20 William R Graner Method for determining uniformity of finish on fibrous glass reinforcement
US3108022A (en) * 1960-05-09 1963-10-22 Polymer Processes Inc Apparatus for coating an elongate body with fluidized coating material

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US995998A (en) * 1911-03-16 1911-06-20 Bradley And Vrooman Company Apparatus for coating objects with subdivided material.
US1263858A (en) * 1917-12-27 1918-04-23 William L Cole Apparatus for applying coatings to bars, rods, pipes, &c.
US1682823A (en) * 1927-08-26 1928-09-04 Sterling Varnish Company Coating apparatus
US1952502A (en) * 1930-05-31 1934-03-27 Una Welding Inc Apparatus for coating wire
US2053307A (en) * 1932-09-06 1936-09-08 Thomas H Wilson Machine for coating pipes
US2287825A (en) * 1938-07-30 1942-06-30 Standard Oil Co California Apparatus for cooling coated pipe
US2380968A (en) * 1944-03-28 1945-08-07 Continental Can Co Apparatus for degreasing containers
US2573815A (en) * 1946-05-07 1951-11-06 Alonzo L Smith Coating press and holiday detector
US2880109A (en) * 1955-09-22 1959-03-31 United States Steel Corp Method of coating the interior of cylinders
US3004861A (en) * 1956-01-12 1961-10-17 Polymer Corp Methods and apparatus for applying protective coatings
US2988641A (en) * 1957-01-28 1961-06-13 Dunlop Rubber Co Production of sheet materials
US3065350A (en) * 1959-03-09 1962-11-20 William R Graner Method for determining uniformity of finish on fibrous glass reinforcement
US3108022A (en) * 1960-05-09 1963-10-22 Polymer Processes Inc Apparatus for coating an elongate body with fluidized coating material

Cited By (38)

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Publication number Priority date Publication date Assignee Title
US3409456A (en) * 1963-12-04 1968-11-05 Mansfield Sanitary Inc Method and apparatus for dusting mold cores
US3299853A (en) * 1964-01-16 1967-01-24 Amsted Ind Inc Apparatus for coating elongated objects
US3476081A (en) * 1964-03-25 1969-11-04 United States Steel Corp Fluidizing chamber
US3443984A (en) * 1964-03-27 1969-05-13 Martin Sweets Co Inc The Method of coating tubular object with polyurethane foam
US3508946A (en) * 1964-04-09 1970-04-28 Dow Corning Pipe coated with epoxy resin composition cured with extra-coordinate silicon complex and process for coating said pipe
US3486921A (en) * 1965-11-12 1969-12-30 Neil R Wallis Method for applying powder coatings to articles
US3453134A (en) * 1966-03-03 1969-07-01 Banister Corp Electrostatic pipe coating method and apparatus
US3526027A (en) * 1967-05-29 1970-09-01 Continental Can Co Apparatus for coating side seam areas of containers
US3602288A (en) * 1968-06-25 1971-08-31 Howmet Corp Apparatus for manufacture of refractory shell molds
US3688737A (en) * 1969-11-04 1972-09-05 Glass Container Mfg Inst Inc Vapor deposition apparatus including air mask
US3869300A (en) * 1970-10-24 1975-03-04 Metallgesellschaft Ag Method of internally coating ducts with synthetic resin
US3946125A (en) * 1970-10-24 1976-03-23 Metallgesellschaft Aktiengesellschaft Method for internally coating ducts with synthetic resin
US3853581A (en) * 1972-06-02 1974-12-10 Air Ind Method of coating articles with electrostatically charged particles
US3904930A (en) * 1974-04-17 1975-09-09 Estey Dynamics Corp Automatic powder spray apparatus and method for spraying the inside surfaces of containers
US4127815A (en) * 1974-05-20 1978-11-28 Republic Steel Corporation Method and apparatus for marking an article following flaw detection using a fusible metal powder
US3968288A (en) * 1974-10-16 1976-07-06 Armstrong Cork Company Method of producing embossed, two-colored surface on fibrous board product and product produced thereby
US4034703A (en) * 1975-09-25 1977-07-12 Metallgesellschaft Aktiengesellschaft Apparatus for externally coating endless metal tubing and like elongated metal members
US4263871A (en) * 1978-01-04 1981-04-28 Gibson Jack Edward Apparatus for powder coating sucker rod
US4237817A (en) * 1979-03-23 1980-12-09 Commercial Resins Company Apparatus for spraying powder circumferentially around a pipe joint
US4397702A (en) * 1980-01-09 1983-08-09 Johnson Controls, Inc. Fabrication of non-conductive charged sensing probe unit
US4752497A (en) * 1983-08-25 1988-06-21 Shaw Industries Ltd. Method of applying an impact resistant moisture impermeable resinous coating
US4749593A (en) * 1985-02-21 1988-06-07 Prazisions-Werkzeuge Ag Coating arrangement and process for preventing deposits of a coating material
US5107789A (en) * 1989-02-01 1992-04-28 Blodgett & Blodgett, P.C. Article coating system
FR2698952A1 (fr) * 1992-12-09 1994-06-10 Gts Isopipe Procédé et dispositif pour revêtir d'une enveloppe isolante un tube et tube obtenu par ce procédé.
EP0601913A1 (de) * 1992-12-09 1994-06-15 Isotub Coating Verfahren und Vorrichtung zum Umhüllen von einen Rohrleitung mit einem Isoliermantel und durch dieses Verfahren erhaltene Rohrleitung
WO2001089710A3 (en) * 2000-05-20 2002-03-14 John W Betteridge Apparatus and method for coating the exterior surface of a pipe
US20050013941A1 (en) * 2000-05-20 2005-01-20 Betteridge John W Apparatus and method for coating the exterior surface of a pipe
US7105204B2 (en) 2000-05-20 2006-09-12 Betteridge John W Apparatus and method for coating the exterior surface of a pipe
US10486181B2 (en) * 2007-08-17 2019-11-26 Pipeline Induction Heat Limited Apparatus for coating pipes
US20110159192A1 (en) * 2007-08-17 2011-06-30 Pipeline Induction Heat Limited Apparatus for coating pipes
EP2253384B1 (de) 2009-05-18 2016-03-23 Cefla Deutschland GmbH Beschichtungsvorrichtung für langgestreckte Werkstücke
EP2253384A1 (de) * 2009-05-18 2010-11-24 Delle Vedove Deutschland GmBh Beschichtungsvorrichtung für langgestreckte Werkstücke
US20120094031A1 (en) * 2009-05-22 2012-04-19 Durr Systems Gmbh Method and coating plant for providing a workpiece with a coating
US8535752B2 (en) 2010-10-20 2013-09-17 L&P Property Management Company Automated powder-coating method
WO2022110732A1 (zh) * 2020-11-27 2022-06-02 常州船用电缆有限责任公司 电缆喷涂设备
CN113499919A (zh) * 2021-07-20 2021-10-15 黑龙江北方工具有限公司 一种风帽喷涂烘干装置及方法
CN116160676A (zh) * 2023-04-06 2023-05-26 河北聚丰华春保温材料有限公司 一种管道防腐胶带的喷涂缠绕装置
CN116160676B (zh) * 2023-04-06 2023-07-04 河北聚丰华春保温材料有限公司 一种管道防腐胶带的喷涂缠绕装置

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Publication number Publication date
DE1427625A1 (de) 1968-10-31
NL273178A (de)
NL131679C (de)
FR1309661A (fr) 1962-11-16
GB976327A (en) 1964-11-25
BE612347A (fr) 1962-07-05

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