WO2001036107A1 - Dispositif de revetement de particules, papillon pour tour de pulverisation et procede de revetement de particules - Google Patents

Dispositif de revetement de particules, papillon pour tour de pulverisation et procede de revetement de particules Download PDF

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Publication number
WO2001036107A1
WO2001036107A1 PCT/JP1999/006389 JP9906389W WO0136107A1 WO 2001036107 A1 WO2001036107 A1 WO 2001036107A1 JP 9906389 W JP9906389 W JP 9906389W WO 0136107 A1 WO0136107 A1 WO 0136107A1
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WO
WIPO (PCT)
Prior art keywords
jet
coating
tower
gas inlet
jet gas
Prior art date
Application number
PCT/JP1999/006389
Other languages
English (en)
Japanese (ja)
Inventor
Tadao Sato
Susumu Tamura
Shigeo Fujii
Takehiko Takahashi
Original Assignee
Chisso Corporation
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 Chisso Corporation filed Critical Chisso Corporation
Priority to PCT/JP1999/006389 priority Critical patent/WO2001036107A1/fr
Publication of WO2001036107A1 publication Critical patent/WO2001036107A1/fr

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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
    • 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
    • B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
    • B05B13/025—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts the objects or work being present in bulk
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/006—Coating of the granules without description of the process or the device by which the granules are obtained
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/16—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G5/00—Fertilisers characterised by their form
    • C05G5/30—Layered or coated, e.g. dust-preventing coatings
    • C05G5/37—Layered or coated, e.g. dust-preventing coatings layered or coated with a polymer

Definitions

  • Granule coating apparatus throttle plate for jet tower, and granule coating method
  • the present invention relates to a particle coating apparatus, and more particularly, to a spouted bed type particle coating apparatus and a throttle plate for a spout tower attached to the apparatus. Further, the present invention relates to a granule coating method using the granule coating apparatus.
  • Spouted bed technology is one of the solid-gas contact technologies. Fluidized bed technology deals with solid-gas reactions, heat exchange, drying of granules, and granules that are relatively coarser than the granules. It is used for coating, granulation, etc.
  • the spouted bed apparatus used in this technology is equipped with a spout tower consisting of a vertical cylindrical body having an inverted conical bottom, a granule supply device and a spouted gas supply device.
  • the high-speed jet gas is injected vertically upward into the jet tower through the orifice provided at the lower end of the tower, and the particles flowing inside the tower move upward at the center of the tower and downward at the periphery of the tower. That is, a spouted bed is created to bring solids and gas into contact (Chemical Engineers' Handbook, Fourth Edition, John H. Perry, 20-41).
  • the granule coating method based on this spouted bed technology sprays a coating liquid into a spouted bed and evaporates the solvent of the coating liquid adhering to the surface of the particles in a spouted state, thereby forming a coating film on the surface of the particle.
  • This method is mainly used for coating small-scale granules for pharmaceuticals and other products.
  • a throttle plate with one vent hole that is, an orifice plate
  • a guide pipe is installed vertically above the throttle plate.
  • inert jet gas is injected into the spout tower, the flow velocity passing through the orifice is 20 m / sec to 70 m / sec, and the flow velocity in the guide pipe is 20 m / sec.
  • This method is used to coat particles of relatively high melting point that can use high-temperature jet gas, such as rice granular ammonium sulfate, with an olefin resin.
  • a large amount of solvent used can be evaporated and the coated granules can be dried in a short time, so it is possible to spray and supply a relatively high concentration of the coating resin solution with a relatively high melting point.
  • This method has good production efficiency and is highly economical as a method for coating a large amount of granules.
  • Another object of the present invention is to provide a method for coating a granular material using the above-described granular material coating apparatus.
  • the present inventors mounted a throttle plate having a plurality of vent holes at the jet gas inlet of a jet tower provided with a guide tube, and caused the particles to be present in the jet tower to jet the jet gas through the vent holes. As a result of the introduction into the tower, it was found that fusion and pulsation of the granules were prevented, and a good spouted bed was formed.
  • the present invention comprises a jet tower consisting essentially of a vertical body and an inverted cone-shaped bottom, a granular material supply device, a jet gas supply device and a coating liquid supply device, and the jet gas at the lower end of the inverted cone-shaped bottom of the jet tower.
  • Throttle plate with a total opening area of 10 to 70% of the inner cross-sectional area of the jet gas inlet with multiple vent holes perforated at the inlet, and a throttle plate Is a granule coating apparatus equipped with a coating liquid spray nozzle in close proximity to the apparatus.
  • a plurality of vents are formed of a single plate perforated in a region defined by an inner cross section of a jet gas inlet of a jet tower, and the total opening area of the vents is equal to the jet gas inlet.
  • This is a throttle plate for a jet tower having an inner cross-sectional area of 10 to 70%.
  • Still another aspect of the present invention is a method for supplying granules from a granule supply device to a jet tower of the granule coating device, and heating the jet gas heated from the jet gas supply device through a vent hole of a throttle plate into the jet tower.
  • a spouted layer of the sprayed particles is formed, and the coating liquid is sprayed from the coating liquid supply device into the spouted layer formed through the coating liquid spray nozzle, and the coating liquid adhering to the surface of the granules in the jet state is removed.
  • This is a granular coating method in which a solvent is evaporated to form a coating film of the coating material on the granular surface.
  • FIG. 1 is a flow sheet showing one embodiment of the granule coating apparatus of the present invention.
  • FIG. 2 is a plan view showing one embodiment of a throttle plate for a jet tower of the present invention.
  • FIG. 3 is a plan view showing another embodiment of the throttle plate for a jet tower of the present invention.
  • FIG. 4 is a plan view showing a conventional throttle plate for a jet tower.
  • the granule coating device of the present invention comprises a jet tower 2, which is essentially composed of a vertical body 4 and an inverted conical lower portion 8, a granule supply device, a jet gas heater 20, and a blower. It comprises a jet gas supply device consisting essentially of 22 and a coating solution supply device consisting essentially of a coating solution preparation tank 32 and a coating solution pump 28.
  • the jet tower 2 has a top plate 42 provided with a jet gas exhaust pipe 40 and a vertical body 4 provided with a granular material inlet 36, and is connected to the vertical body 4 and has a gradually decreasing cross-sectional area as it goes downward.
  • the inverted cone bottom 8 and inverted cone bottom 8 It further comprises a guide pipe 6 which is constituted by a jet gas inlet 10 located at the narrowed lower end and which is preferably provided coaxially and vertically inside the vertical body 4.
  • the horizontal cross-sectional shape of the vertical body 4 is not particularly limited, and may be either circular or polygonal. However, it is preferable that the shape be circular in terms of uniformity of particle circulation in the vertical body 4. .
  • the narrowing angle of the inverted conical bottom 8 with respect to the central axis of the jet tower is set at the repose angle r of the granules in order to smoothly supply the granules from the descending region to the ascending region and discharge the product coated granules.
  • the guide pipe 6 is fixed or suspended coaxially with the vertical body 4 above the jet gas inlet 10 in the vertical body 4, and separates a rising area and a falling area of the granular material in the jet tower. .
  • the guide pipe 6 is a cylindrical body having a cross-sectional area of 0.5 to 4 times, preferably 0.8 to 3 times the inner cross-sectional area of the jet gas inlet 10.
  • the guide pipe 6 generally has a cross-sectional shape similar to that of the vertical body 4, and when the vertical body 4 is cylindrical, the guide pipe 6 is formed of a cylindrical body such as a pipe.
  • the guide tube usually has a smooth surface, but may be formed of a tubular body having small holes, a tubular body formed of a wire mesh, or the like.
  • a smooth pipe without holes or protrusions or a pipe lined with a fluororesin or the like on the inner surface is used as the guide pipe 6. Is done.
  • the jet gas inlet 10 is equipped with a throttle plate 52 having a plurality of vent holes as shown in Figs. 2 and 3, and a coating liquid spray nozzle 26 near the throttle plate 52. Is arranged.
  • the jet gas inlet 10 may be provided with a conventional orifice plate 84 or a venturi nozzle as shown in FIG. 4 instead of the throttle plate 52 if necessary.
  • the preferred jet tower 2 has a cylindrical vertical body 4, an inverted conical lower part 8 and a cylindrical It has a guide tube 6 of a shape.
  • the throttle plate 52 of the present invention includes a plurality of vent holes 56 and / or a plurality of vent holes 56 in an area 54 defined by the inner cross section of the jet gas inlet 10.
  • the number of air holes, the shape of the air holes and the dimensions of the air holes are such that the opening ratio defined by the following equation is 10 to 70%, preferably 20 to 70%.
  • Opening ratio (%) (total opening area of all vents / area of area 54) X 100 If the opening ratio of the vents is too small, the jet gas flow velocity at the jet gas inlet 10 becomes excessive. , on the other hand, if too large, injection-stream gas flow rate at the jet gas inlet 1 0 is too small, c plurality of vent holes can not be achieved the function as the diaphragm plate, the jet gas uniformly from the vent holes The jet gas can be jetted into the jet tower 2, and it is sufficient that the jet gas is arranged in the jet tower 2, preferably in the guide tube 6, so that the upward flow of the jet gas is not deflected. There are no particular restrictions.
  • a plurality of vents having substantially the same opening area are uniformly arranged in a region 54 defined by the jet gas inlet of the throttle plate, or are defined by the jet gas inlet of the throttle plate.
  • Main vents are arranged at the center of the region 54, and a predetermined number of sub vents are arranged at substantially equal intervals outside the outer edge of the main vent.
  • the jet tower 2 has the cylindrical body 4, usually, 3 to 20 pieces, preferably 3 to 12 pieces of circular shapes having a diameter calculated from a predetermined opening ratio are formed in the circular area 54. Vent holes are located and perforated. If the number of vent holes is less than three, the flow of gas passing through the jet gas inlet 10 becomes uneven, and particles are easily deposited and solidified on the throttle plate 52. On the other hand, if the number of air holes exceeds 20, the effect proportional to the increase in the number of air holes cannot be obtained, and the production of the diaphragm plate becomes complicated.
  • a plurality of circular ventilation holes 56 (four in this figure) having substantially the same diameter are arranged at equal intervals on a concentric circle with respect to the center.
  • a relatively large-diameter circular main vent hole 5 6 is provided at the center of the main vent hole 56, and a plurality of circular sub-vent holes 5 8 (which have a smaller diameter than the main vent hole 56 on a concentric circle outside the main vent hole 56).
  • eight are drilled at equal intervals.
  • the number of the secondary vents is not particularly limited, but is preferably 6 to 12. Examples of the arrangement of the ventilation holes include a grid pattern, a staggered pattern, and the like in addition to the above examples.
  • the ratio of the total opening area of the sub-vents to the opening area of the main vents is preferably 100: 10 to 70. If the ratio of the opening area of the sub vent to the opening area of the main vent is too small, the particles tend to deposit and solidify on the aperture plate 52. If the ratio is large, it will be difficult to obtain a sufficient flow velocity of the jet gas.
  • the outer shape of the throttle plate is not particularly limited, and is appropriately selected depending on a method of attaching the throttle plate to the jet gas inlet 10.
  • a fixed type or a movable type may be adopted as a method of attaching to the jet gas inlet 10, but a movable type is preferable in consideration of discharge of product-coated granules.
  • a slide type as shown in FIG. 2 and a rotary type as shown in FIG. 3 are preferable.
  • One end of a pipe 12 is connected to the jet gas inlet 10 equipped with the throttle plate 52, and a coated particle discharge port 16 is provided at the other end of the pipe 12 via an on-off valve 14.
  • One end of a jet gas supply pipe 18 is connected to the pipe 12, and the other end of the jet gas supply pipe 18 is connected to a blower 22 via a jet gas heater 20 and a flow meter 24 in the middle. Are linked.
  • the jet gas from the blower 22 is heated by the jet gas heater 20 and then jetted into the jet tower 2 through the ventilation holes of the throttle plate 52 attached to the jet gas inlet 10.
  • the coating liquid spray nozzle 26 is provided with a jet gas inlet 10 in a vertically extended area of the vent hole so that the coating liquid can be uniformly sprayed into the jet gas passing through the vent hole of the throttle plate 52.
  • a jet gas inlet 10 in a vertically extended area of the vent hole so that the coating liquid can be uniformly sprayed into the jet gas passing through the vent hole of the throttle plate 52.
  • the coating liquid spray nozzles 26 may be arranged in a plurality of air holes as shown in FIG. 2 or in one air hole as shown in FIG. 3, and the number is not particularly limited.
  • the mounting height of the coating liquid spray nozzle 26 may be higher or lower than the jet gas inlet 10.
  • the position and shape of the spray nozzle 26 are appropriately determined according to the properties of the spray liquid, operating conditions, and the like.
  • One end of a coating liquid supply pipe 30 is connected to the spray nozzle 26 via a coating liquid supply pump 28, and the other end of the coating liquid supply pipe 30 is a coating liquid preparation tank with a heating jacket 34. 3 Connected to 2.
  • the coating liquid prepared in the coating liquid preparation tank 32 is sprayed from the spray nozzle 26 into the jet gas by the coating liquid supply pump 28 through the coating liquid supply pipe 30.
  • the granules 39, 44, and 46 are provided on the vertical body 4 of the jet tower 2 via a granule charging valve 38 using the above-described granule coating apparatus.
  • the granular material is supplied into the spout tower 2 from the inlet 36, and the spout gas is spouted from the spout gas inlet 10 through the vent holes 56 and 58 of the throttle plate 52 to form a spouted layer 37.
  • the coating liquid is sprayed from a spray nozzle 26 into the spouted bed, and the solvent of the coating liquid attached to the surface of the particles in a jet state is volatilized and evaporated to form a coating film of the coating material on the particles. It is.
  • the spouted layer 37 has a flow velocity of the jet gas passing through the ventilation hole of the throttle plate 52 of 20 to 7 OmZsec, although it varies depending on the type, density, particle size, etc. of the granules.
  • the superficial velocity of the jet gas in the guide pipe 6 is reduced By setting the terminal velocity to 1.5 to 3 times the terminal velocity of 39, a better spouted bed 37 is formed.
  • the granules to be coated are not particularly limited, but are particularly effective in the case of granules in which it is necessary to control the elution rate of the active ingredient contained in the granules by coating.
  • the active ingredient varies depending on the purpose of use, for example, urea, ammonium sulfate, salt and salt, ammonium nitrate, potassium chloride, sulfate potassium, nitrate potassium, sodium nitrate, ammonium phosphate, potassium phosphate, lime phosphate, chelate iron, iron oxide, chloride Iron, boric acid, borax, manganese sulfate, manganese chloride, zinc sulfate, copper sulfate, sodium molybdate, ammonium molybdate, OMUP (crotilidene diurea), IBDU (isobutylidene diurea), oxamide, etc.
  • the granules may be granules of one or more active ingredients, or granules comprising one or more of the active ingredients and an inert carrier such as bentonite, zeolite, talc, cres, diatomaceous earth and the like. There may be. Further, the above-mentioned active ingredient particles may be coated with a resin or an inorganic substance. The particle size of these granules is usually in the range of 0.1 to 10 bandages, preferably:! Range of ⁇ 5 mm.
  • the jet gas only needs to be inert to the granules and the coating liquid, for example, air, nitrogen gas, helium gas, etc., and the organic solvent in the coating liquid was partially removed from the jet tower outlet gas.
  • Recycled gas can be used.
  • the coating material used to coat the granules is not particularly limited, but when producing time-eluting coated granules, the elution of the active ingredient contained in the granules should be performed. Materials and compositions with strict control can be selected. As such coating materials.
  • thermosetting resins such as alkyd resins, phenolic resins, epoxy resins, etc .
  • thermoplastic resins such as polyolefins such as polyethylene and polypropylene
  • polyvinylidene chlorides Is mentioned.
  • thermosetting resin or thermoplastic resin when coating granules containing active ingredients that require strict and long-term dissolution control such as fertilizers and pesticides, use thermosetting resin or thermoplastic resin as the coating material. If more advanced elution control is required, it is particularly preferable to use a thermoplastic resin.
  • Preferred thermoplastic resins include polyolefin and its copolymer, polyvinylidene chloride and its copolymer.
  • Preferred polyolefins and their copolymers are polyethylene, polypropylene, ethylene-propylene copolymer, ethylene / vinyl acetate copolymer, ethylene / carbon monoxide copolymer, ethylene / vinyl acetate / carbon monoxide copolymer And ethylene Z acrylate copolymer, ethylene nomethacrylic acid copolymer, rubber resin, polystyrene, polymethyl methacrylate, and the like.
  • polyvinylidene chloride and its copolymer examples include polyvinylidene chloride and a vinylidene chloride / vinyl chloride copolymer.
  • biodegradable polyesters represented by poly-2-hydroxy xy-2-alkylacetic acid, poly-1-hydroxy-3-alkylpyrionic acid and the like can also be mentioned.
  • These coating materials can be coated on the granules by spraying them in a solution dissolved in an organic solvent or in a molten state into a spouted bed.
  • a film of the coating material is formed on the surface of the granular material by using a poor solvent solution of the above resin, spraying the solution into the spouted bed and instantaneously evaporating the solvent.
  • a combination of a resin and an organic solvent that has a property of dissolving at a high concentration when heated and having a property of precipitating and gelling when cooled when cooled is used. preferable. This combination forms a very dense coating film, and is particularly suitable for forming a time-dissolved coating film.
  • coating materials include inorganic fillers such as talc, Activators and the like can also be used. These coating materials are dissolved / dispersed or melted / dispersed in a solvent and sent to a spray nozzle to be used for coating the particles.
  • the granule coating apparatus of the present invention can be used as it is as a granulation apparatus.
  • Fig. 1 shows the granule coating apparatus used in the examples and comparative examples
  • Fig. 2 and Fig. 3 show the diaphragm plates 52 used in Examples 1 and 2
  • Fig. 8 shows the diaphragm plates 84 used in the comparative example. See Figure 4.
  • the used jet tower 2 had a vertical body 4 with an inner diameter of 600, a jet gas inlet 10 provided at the lower end of the inverted cone-shaped lower part with an inner diameter of 154 mm, and a total from the jet gas inlet 10 to the top plate 42. It had a height of 5,000 mm and a guide tube 6 with a diameter of 150 and a length of 880 mm inside.
  • Example 1 In the throttle plate 52 used in Example 1, four ventilation holes 56 having an inner diameter of 45 mm are arranged at equal intervals on a circumference having a diameter of 95 referred to the center of the center of the jet gas inlet, The aperture ratio was 34% (see Figure 2).
  • the throttle plate 52 is attached to the jet gas inlet 10 of the jet tower 2, and each of the ventilation holes is provided in Example Nos. 1-1-1 to 3-3, and two opposed ventilation holes are provided in Example Nos. 1-4.
  • a spray nozzle 26 was placed on the center extension.
  • the throttle plate 52 used in Example 2 has a main ventilation hole 56 with an inner diameter of 80 at the center of the jet gas inlet, and a circle with a diameter of 95 around the center of the main ventilation hole 56.
  • the sub-vents 58 with an inner diameter of 15 mm were arranged at equal intervals, and the opening ratio was 34% (see Fig. 3).
  • the throttle plate 52 was attached to the jet gas inlet 10 of the jet tower 2, and the spray nozzle 26 was arranged on the extension of the center of the main ventilation hole 56.
  • an orifice plate 84 with an opening ratio of 34% in which one vent hole 82 with an inner diameter of 95 was located at the center of the jet gas inlet, was attached to the jet gas inlet 10 of the jet tower 2. Then, the spray nozzle 26 was arranged on the extension of the center.
  • granular urea having an average particle diameter of 2.7, specific gravity of 1.3 g / cm 3 , and a melting point of 133 ° C was used.
  • the coating solution a solution obtained by mixing the following at 100 ° C. was used.
  • a predetermined amount of particles was injected from the particle input port 36 while nitrogen, which was maintained at a predetermined air volume and temperature, was blown into the jet tower 2 through the vent hole.
  • the coating liquid supply pump 28 was operated to spray the coating liquid in the coating liquid preparation tank 32 at a predetermined speed from the spray nozzle 26 for a predetermined time. After that, the blower 122 was stopped, and the coated particles were extracted from the coated particle outlet 16.
  • Table 1 shows the various operating conditions, the state of the jet during operation (with or without pulsation), and the presence or absence of melting and consolidation of the granules in the jet tower.
  • Covering rate of coated granules 10 g of the coated granules were crushed in a mortar, washed with water, and only the coating material was collected. The obtained coating material was dried and calculated from the measured weight of the coating material. All samples had a coverage of 12% by weight.
  • Initial dissolution rate 10 g of the coated granules were immersed in 200 ml of water at 25 ° C., and the dissolution rate (%) was calculated from the amount of urea eluted in water 24 hours later.
  • the initial dissolution rate of the obtained coated granules was remarkably increased irrespective of the gas temperature and the air flow rate in the examples, but increased with the gas temperature and the air flow rate in the comparative examples.
  • the granule coating apparatus of the present invention is characterized in that the jet tower is provided with a throttle plate having a plurality of vent holes, so that the jet is prevented from drifting irrespective of the fact that the jet tower has a relatively large diameter. Are formed, and accumulation, melting and consolidation of the particles on the drawing plate are prevented. As a result, the operation of the device is stabilized, and a large amount of particles can be stably coated. In particular, more stable operation is possible with a covered device in which a guide tube is provided in the jet tower.
  • coated granules with stable elution can be obtained.
  • a large amount of coated granules can be produced at a time with a stable initial elution suppression period determined by the coating composition.
  • the method for producing coated granules of the present invention can be used as a solvent for a coating material such as polyolefin, so that it is particularly suitable for uniformly coating a polyolefin film on the surface of the granules.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Glanulating (AREA)

Abstract

L'invention concerne un dispositif de revêtement de particules équipé d'une tour (2) de pulvérisation, lequel applicateur est caractérisé en ce qu'un papillon (52), perforé d'une pluralité d'orifices (56) destinés au passage de l'air et pourvu de buses (26) d'atomisation de liquide de revêtement adjacentes au papillon (52), est monté sur l'orifice d'entrée (10) du jet gazeux de la tour (2) de pulvérisation, les orifices destinés au passage de l'air représentant une surface d'ouverture totale équivalant à 10 à 70 % de la surface de la section intérieure dudit orifice d'entrée. L'invention concerne également un papillon (52) perforé d'une pluralité d'orifices (56) destinés au passage de l'air, lesquels orifices représentent une surface d'ouverture totale équivalant à 10 à 70 % de la surface de la section intérieure de l'orifice d'entrée (10) du jet gazeux de la tour (2) de pulvérisation. Le dispositif de revêtement de particules selon l'invention est caractérisé en ce que les particules sont fournies à la tour (2) de pulvérisation, qui renferme des tubes (6) de guidage, en ce qu'un jet gazeux chauffé est projeté dans la tour (2) de pulvérisation au travers des orifices (56) destinés au passage de l'air pratiqués dans le papillon (52) de manière à former une couche de pulvérisation de particules, en ce qu'un liquide de revêtement est vaporisé en un flux atomisé par les buses (26) d'atomisation de liquide de revêtement, et en ce qu'un solvant liquide de revêtement déposé sur la surface des particules à l'état pulvérisé s'évaporent de manière à former des couches de matériau de revêtement sur lesdites particules.
PCT/JP1999/006389 1999-11-16 1999-11-16 Dispositif de revetement de particules, papillon pour tour de pulverisation et procede de revetement de particules WO2001036107A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108450446A (zh) * 2018-04-11 2018-08-28 朱子中 电动自动喷雾器
CN115740472A (zh) * 2022-09-07 2023-03-07 西安赛隆增材技术股份有限公司 一种粉体表面改性设备及改性方法

Citations (7)

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Publication number Priority date Publication date Assignee Title
GB1421603A (en) * 1972-02-14 1976-01-21 Ibm Coated carrier particles for use in electrophotographic processes and their preparation
JPH0231039B2 (fr) * 1981-01-21 1990-07-11 Chisso Corp
JPH10118557A (ja) * 1996-10-16 1998-05-12 Chisso Corp 粒体の被覆方法
JPH10128173A (ja) * 1996-11-01 1998-05-19 Chisso Corp 粒体の被覆装置、及び粒体の被覆方法
JPH10156167A (ja) * 1996-11-27 1998-06-16 Chisso Corp 粒体被覆装置、及び粒体の被覆方法
JPH10156166A (ja) * 1996-11-27 1998-06-16 Chisso Corp 粒体被覆装置、及び粒体被覆方法
JPH119985A (ja) * 1997-06-19 1999-01-19 Ube Ind Ltd 流動層粉体被覆装置及び被覆肥料の製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1421603A (en) * 1972-02-14 1976-01-21 Ibm Coated carrier particles for use in electrophotographic processes and their preparation
JPH0231039B2 (fr) * 1981-01-21 1990-07-11 Chisso Corp
JPH10118557A (ja) * 1996-10-16 1998-05-12 Chisso Corp 粒体の被覆方法
JPH10128173A (ja) * 1996-11-01 1998-05-19 Chisso Corp 粒体の被覆装置、及び粒体の被覆方法
JPH10156167A (ja) * 1996-11-27 1998-06-16 Chisso Corp 粒体被覆装置、及び粒体の被覆方法
JPH10156166A (ja) * 1996-11-27 1998-06-16 Chisso Corp 粒体被覆装置、及び粒体被覆方法
JPH119985A (ja) * 1997-06-19 1999-01-19 Ube Ind Ltd 流動層粉体被覆装置及び被覆肥料の製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108450446A (zh) * 2018-04-11 2018-08-28 朱子中 电动自动喷雾器
CN115740472A (zh) * 2022-09-07 2023-03-07 西安赛隆增材技术股份有限公司 一种粉体表面改性设备及改性方法

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