WO2017038461A1 - Procédé d'application de liquide - Google Patents

Procédé d'application de liquide Download PDF

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Publication number
WO2017038461A1
WO2017038461A1 PCT/JP2016/073959 JP2016073959W WO2017038461A1 WO 2017038461 A1 WO2017038461 A1 WO 2017038461A1 JP 2016073959 W JP2016073959 W JP 2016073959W WO 2017038461 A1 WO2017038461 A1 WO 2017038461A1
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WO
WIPO (PCT)
Prior art keywords
liquid
coated
nozzle
liquid nozzle
tip
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Application number
PCT/JP2016/073959
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English (en)
Japanese (ja)
Inventor
和昭 佐藤
翔志 柿崎
Original Assignee
アネスト岩田株式会社
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Publication of WO2017038461A1 publication Critical patent/WO2017038461A1/fr

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    • 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
    • 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
    • B05D7/22—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 internal surfaces, e.g. of tubes

Definitions

  • the present invention relates to a liquid coating method.
  • a spray gun capable of applying a liquid such as a paint to the inner surface of an object to be coated having an internal space such as a pipe or a container
  • a configuration that directs the spray direction is provided on the tip side of the liquid nozzle so that the atomized liquid that is sprayed from the liquid nozzle and atomized with compressed air or the like is sprayed to the inner surface side, This makes it possible to apply liquid to the inner surface.
  • the gas used for atomization from the internal space of the pipe or the container toward the external space tends to escape, air can flow from the internal space toward the external space. Then, there is a problem that the liquid that could not be applied to the inner surface flows on the air flow and is applied to the outer periphery of the liquid nozzle.
  • the compressed gas ejected from the liquid nozzle has a bottom surface, and thus forms a flow that flows away from the bottom surface. Then, since the atomized liquid also flows along the gas flow, the flow of the atomized liquid also becomes a flow away from the bottom surface, and not only the liquid cannot be sufficiently applied to the bottom surface, but also the unpainted portion of the liquid is formed on the bottom surface. May occur.
  • the atomization sprayed from the liquid nozzle is applied when the liquid is applied to the side surface and when the liquid is applied to the bottom surface. Since the direction in which the liquid is directed has to be changed, the liquid nozzle is exchanged or different spray guns are used for the side surface and the bottom surface, resulting in poor work efficiency.
  • This invention is made
  • the present invention is grasped by the following composition in order to achieve the above-mentioned object.
  • a voltage is applied between a liquid spray portion having a mandrel in a liquid nozzle and a different polarity portion with respect to the liquid spray portion, and the liquid spray portion and the different polarity portion.
  • the liquid is charged by an electrostatic force generated between the liquid and the liquid, and the liquid is detached from the tip of the liquid nozzle by the electrostatic force to apply the liquid to the inner surface of the object having an internal space.
  • a liquid deposition method wherein the liquid nozzle is positioned in an internal space of the object to be coated, and the liquid separated from the inner surface of the object to be coated is applied to the inner surface of the object to be coated.
  • a voltage is applied between the liquid spraying part having a liquid nozzle and the different polar part with respect to the liquid spraying part, so that the liquid spraying part and the different polar part are between.
  • a liquid applying method in which the liquid is charged by electrostatic force generated in the liquid, and the liquid is detached from the tip of the liquid nozzle by the electrostatic force, and the liquid is applied to the inner surface of the object having an internal space. Then, the liquid nozzle is positioned in the internal space of the object to be coated, and the liquid separated from the inner surface of the object to be coated as the different polar part is applied to the inner surface of the object to be coated.
  • FIG. 1 is a diagram for explaining a basic configuration for spraying a liquid according to an embodiment of the present invention, and is a cross-sectional view taken along a center line of a liquid spray unit 20.
  • a voltage applying means (voltage power source) 50 is provided between the liquid spray unit 20 supported by the support unit 10 and the object to be coated 30, so that the object 30 is applied to the liquid spray unit 20.
  • a different polar part is formed.
  • the liquid application method for applying a liquid to the object to be coated 30 will be described in detail later.
  • a voltage between the liquid spray unit 20 and the object to be coated 30 the liquid is applied.
  • An electrostatic force is generated between the spray unit 20 and the object to be coated 30, and the liquid such as paint is charged by the electrostatic force, and the charged liquid is separated from the liquid spray unit 20 by the electrostatic force.
  • the object 30 is applied.
  • the liquid spray unit 20 includes a body part 21 made of an insulating material in which a liquid channel 21 b having a liquid supply port 21 a to which a liquid is supplied is formed, and a through-hole serving as a liquid flow of the body part 21.
  • a liquid nozzle 22 provided at the tip of the body portion 21 so as to communicate with the passage 21b, and a mandrel 23 made of a conductive material disposed in the liquid flow path 21b of the body portion 21 and in the through hole of the liquid nozzle 22. I have.
  • the body portion 21 is provided with a hole portion 21c communicating with the liquid channel 21b in order to take out the mandrel 23 to the rear end side, and a gap between the mandrel 23 is sealed in the hole portion 21c.
  • a seal member 24 is provided to prevent liquid from leaking.
  • an O-ring is used as the seal member 24.
  • the O-ring is not limited to the O-ring, and any member that can be sealed may be used.
  • a knob portion 23a made of an insulating material is provided and provided so as to penetrate almost the center of the knob portion 23a.
  • An electrical wiring connection portion 23b made of the conductive material thus provided is provided.
  • An electrical wiring from the voltage application means 50 is connected to the electrical wiring connection portion 23b, and the electrical wiring connection portion 23b is brought into contact with the mandrel 23 so that the mandrel 23 and the electrical wiring connection portion 23b are electrically connected. It is connected.
  • a female screw structure 21e for screwing and connecting the knob portion 23a is provided on the inner peripheral surface of the rear end opening 21d of the body portion 21, while a male screw is provided on the outer peripheral surface of the tip portion of the knob portion 23a.
  • a structure 23c is provided.
  • the mandrel 23 is removably attached to the body part 21 by screwing the male screw structure 23c on the outer peripheral surface of the tip of the knob 23a into the female screw structure 21e of the rear end opening 21d of the body part 21. Further, the mandrel 23 can be moved in the front-rear direction by adjusting the screwing amount of the knob 23a, and the position of the distal end surface 23d of the mandrel 23 can be adjusted in the front-rear direction.
  • the electrical wiring connection portion 23b has a shape having a rear end portion having an outer diameter larger than that of the rod portion on the front end side.
  • the electrical wiring connection portion 23b is formed.
  • the rear end portion of the portion 23b presses the tip attachment portion 11 of the support portion 10 against the rear end surface of the knob portion 23a, and thereby the support portion 10 is connected to the liquid spraying portion 20. .
  • the tip mounting portion 11 of the support portion 10 is made of an insulating material, and an electrical wiring connection portion for passing a rod-like portion on the tip side of the electrical wiring connection portion 23b through the tip mounting portion 11.
  • a through hole substantially equal to the outer diameter of the rod-like portion on the distal end side of 23b is provided, and the mandrel is passed through the rod-like portion on the distal end side of the electric wiring connecting portion 23b through the through hole and the substantially central through hole of the knob portion 23a.
  • the opening diameter of the tip opening 22b of the liquid nozzle 22 in the form is a large opening diameter of 0.2 mm. As a result, the frequency of occurrence of clogging can be greatly reduced.
  • the opening diameter of the tip opening 22b of the liquid nozzle 22 is not limited to 0.2 mm, and in the embodiment using the mandrel 23, there is no problem even if the opening diameter is about 1 mm.
  • the opening diameter of the tip opening 22b of the liquid nozzle 22 is preferably 0.1 mm or more, more preferably 0.2 mm or more, more preferably 0, considering that clogging is unlikely to occur and cleaning is possible even when clogging occurs. It is preferable to make it larger than 2 mm.
  • the opening diameter of the tip opening 22b of the liquid nozzle 22 is preferably 1.0 mm or less, more preferably 0.8 mm or less, and further preferably 0.5 mm or less in consideration of the stability of atomization.
  • the mandrel 23 can be moved in the front-rear direction as described above, the clogging can be eliminated by moving the mandrel 23 even if clogging occurs. Furthermore, since the inner diameter of the through hole of the liquid nozzle 22 is also large enough to allow the mandrel 23 to be disposed, it is possible to remove the mandrel 23 and wash it by flowing a large amount of cleaning liquid.
  • FIG. 2 is an enlarged view in which the distal end side of the liquid spraying part 20 is enlarged.
  • FIG. 2A is a case where the distal end surface 23d of the mandrel 23 is located rearward, and FIG. This is a case where the distal end surface 23d of the mandrel 23 is located in front of the state of (a).
  • the liquid nozzle 22 has a tapered inner diameter portion (see range A) having a taper angle ⁇ that decreases in an inner diameter in a tapered manner toward the tip opening 22b side.
  • 23 has a taper-shaped portion (see range B) having a taper angle ⁇ of which the outer diameter decreases toward the distal end surface 23d.
  • the taper angle ⁇ of the tapered inner diameter portion of the liquid nozzle 22 is set larger than the taper angle ⁇ of the tapered portion of the mandrel 23.
  • the diameter of the tip surface 23d of the mandrel 23 is smaller than the diameter of the tip opening 22b of the liquid nozzle 22, but the tapered portion of the mandrel 23 gradually increases in diameter toward the rear end side.
  • the liquid nozzle 22 is formed so as to have a portion having a diameter larger than the opening diameter of the tip opening 22b of the liquid nozzle 22.
  • the width of the gap formed by the mandrel 23 can be adjusted, and the amount of liquid exiting from the tip opening 22b of the liquid nozzle 22 can be adjusted.
  • the mandrel 23 comes into contact with the inner peripheral surface of the liquid nozzle 22 and closes the tip opening 22 b of the liquid nozzle 22. Is possible. Therefore, it is possible to prevent the liquid in the liquid nozzle 22 from drying by blocking the tip opening 22b of the liquid nozzle 22 with the mandrel 23 in a state where the liquid is not sprayed, and to suppress clogging of the liquid nozzle 22. it can.
  • an electrical wiring on the opposite side to that connected to the mandrel 23 of the voltage applying means (voltage power source) 50 is connected to the object to be coated 30 so that the object to be coated 30 itself is liquid sprayed. It is made to become a different polar part to part 20. Further, the article 30 is grounded by the grounding means 80.
  • the grounding means 80 is not an essential requirement, but is preferably provided from the viewpoint of safety when an operator touches the article 30 to be coated.
  • the electrical wiring from the voltage application means 50 is illustrated as being directly connected to the workpiece 30, but it is not necessary to connect the electrical wiring directly to the coating 30.
  • the wiring object 30 is electrically connected to the voltage application unit 50 via the placement unit such that an electrical wiring from the voltage application unit 50 is connected to a placement unit or the like on which the workpiece 30 is placed. It may be connected.
  • liquid supplied to the liquid supply port 21 a of the body portion 21 is supplied to the tip side of the liquid nozzle 22, and the front side is caused by the electrostatic force accompanying the voltage applied between the workpiece 30 and the mandrel 23. Pulled away and atomized forward.
  • the supply of the liquid is sufficient if the liquid that is lost from the liquid spraying part 20 by being consumed by spraying is supplied in sequence, and the tip opening 22b of the liquid nozzle 22 (more precisely, the tip opening 22b and It is not necessary to be pumped and supplied at such a pressure that the liquid is ejected from the gap between the mandrel 23, and in the state where the liquid is ejected vigorously, it may occur that the atomization cannot be performed.
  • the supply pressure is preferably 0.01 MPa or less, and the liquid supply amount is preferably 10 mL / min or less.
  • FIG. 3 shows that the electrostatic force that pulls the liquid forward balances the adhesion force due to the surface tension and viscosity on the distal end surface 23d of the mandrel 23 and the distal outer peripheral edge 22a of the liquid nozzle 22.
  • the tailor cone 60 in which the liquid supplied to the tip side of the liquid nozzle 22 has a conical shape at the tip is formed.
  • the tailor cone 60 is formed in a conical shape by separating the positive / negative charges in the liquid by the action of an electric field, and deforming the meniscus at the tip of the liquid nozzle 22 charged with an excess charge. Then, the liquid is pulled from the tip of the tailor cone 60 by electrostatic force, and then the liquid is sprayed over a wide range by electrostatic explosion.
  • the separation of the liquid from the tip of the liquid nozzle 22 is not performed by the supply pressure of the liquid, but static electricity generated between the object to be coated 30 and the liquid spraying unit 20 (the mandrel 23 in the present embodiment).
  • the liquid is charged by force, and the charged liquid is pulled by electrostatic force.
  • the liquid to be sprayed that is, the liquid that has been separated from the liquid nozzle 22 to become liquid particles has a drastically larger area in contact with the air than before the separation, so that the evaporation of the solvent is promoted.
  • electrostatic repulsion electrostatic explosion
  • the mandrel 23 is provided in the liquid nozzle 22. If the mandrel 23 is not provided, the liquid can be attached only to the outer peripheral edge 22 a of the tip of the liquid nozzle 22.
  • the liquid can be attached only to the outer peripheral edge 22a of the tip of the liquid nozzle 22. Since the tailor cone 60 cannot be formed easily, or the tailor cone 60 itself cannot be maintained, the stability of the liquid particles separated from the liquid nozzle 22 (size, number, charged state, etc. of the particles) It is inferred that the liquid cannot be stably atomized as a result.
  • the liquid adheres not only to the tip outer peripheral edge 22 a of the liquid nozzle 22 but also to the tip surface 23 d of the mandrel 23. Therefore, even if the opening diameter of the tip opening 22b of the liquid nozzle 22 is large, the tip end surface 23d of the mandrel 23 to which the liquid can adhere is present in the opening of the tip opening 22b, so that a stable tailor cone 60 can be formed. It is considered that stable atomization of the liquid is possible.
  • the distal end surface 23d of the mandrel 23 protrudes too far forward from the distal outer peripheral edge 22a of the liquid nozzle 22 (that is, the distal end surface of the distal end opening 22b of the liquid nozzle 22), an electric field is less likely to act on the liquid exiting the liquid nozzle 22.
  • the distal end surface 23d of the mandrel 23 is excessively retracted backward from the distal end surface of the distal end opening 22b of the liquid nozzle 22, the state is the same as when there is no portion to which the liquid can adhere in the opening of the distal end opening 22b.
  • the position of the distal end surface 23d of the mandrel 23 is the liquid nozzle in the front-rear direction along the central axis of the mandrel 23 with respect to the distal end surface of the distal end opening 22b of the liquid nozzle 22 in the state where the liquid is sprayed. It is suitable that it is located within 10 times the opening diameter of the tip opening 22b of 22, more preferably it is located within 5 times, more preferably it is preferably located within 3 times. is there.
  • the liquid exiting from the tip opening 22b of the liquid nozzle 22 is at the tip of the liquid nozzle 22. It comes out to be a hemisphere with a diameter of about 0.2 mm.
  • the tip of the mandrel 23 should be close to the liquid so that a conical tailor cone 60 can be formed by applying an electric field (electrostatic force) to the liquid coming out of the tip of the liquid nozzle 22.
  • an electric field electrostatic force
  • the tip of the mandrel 23 is positioned within 2 mm forward (in the direction of exit) from the tip surface of the tip opening 22b of the liquid nozzle 22, while the tip of the mandrel 23 acts to adhere to the liquid.
  • the liquid nozzle 22 be positioned within 2 mm rearward (in the retracting direction) from the front end surface of the front end opening 22b.
  • the opening diameter of the tip opening 22b of the liquid nozzle 22 can be set to a large opening diameter that can prevent clogging. Further, since the opening diameter of the tip opening 22b of the liquid nozzle 22 can be increased, the liquid nozzle 22 can be manufactured by machining.
  • the tip of the mandrel 23 is shown as a flat flat surface as the tip surface 23d.
  • the tip of the mandrel 23 is not necessarily a flat flat surface, and the stable tailor cone 60 is formed.
  • the tip of the mandrel 23 may be a curved surface protruding toward the front side, such as an R shape.
  • the liquid that is separated from the liquid nozzle 22 and is in an atomized state while repeating electrostatic explosion is in a charged state, and therefore is attracted to the object 30 side by electrostatic force and atomized with compressed air. It can be applied to the object to be coated 30 with a high efficiency (e.g., an efficiency of almost 100%) that is not comparable to a product. Since the basic state of spraying / coating the liquid is as described above, hereinafter, the inner surface (the inner surface or the inner surface or the like) of the article 30 (for example, a pipe or a container) having the inner space according to the embodiment of the present invention. A liquid application method for applying liquid to the inner bottom surface will be described.
  • FIG. 4 is a diagram showing a state when a liquid is applied to the inner surface 33 of the article 30 having a bottomed inner space, that is, the inner side surface 31 and the inner bottom surface 32.
  • FIG. 4A is a diagram illustrating a state in which the liquid is first applied, and is a state when the liquid spraying unit 20 is located on the opening 34 side of the object to be coated 30, and FIG.
  • FIG.4 (c) is It is a figure which shows the state immediately before finishing liquid painting, and has shown the state which the liquid spray part 20 has moved to the inner bottom face 32 side of the to-be-coated article 30 further from the state of (b).
  • FIG. 4 illustration of the voltage applying means (voltage power source) 50 is omitted, but as described above, the liquid spraying unit 20 (the mandrel 23 in this example) and the object to be coated 30 (for example, the outer surface 35). ) Is electrically connected to a voltage applying means (voltage power source) 50. Further, for example, a flexible pipe for supplying a liquid is connected to the liquid supply port 21a, and the pipe is fixed to the support portion 10 so that the pipe does not get in the way. The illustration of piping for supplying liquid is also omitted.
  • the object 30 When the object 30 is made of a conductive material, it is only necessary to connect (contact) the electrical wiring from the voltage applying means (voltage power source) 50 to the outer surface 35 of the object 30.
  • the inner surface 30 (the inner side surface 31 and the inner bottom surface 32) of 30 can be a different pole part with respect to the liquid spray part 20.
  • the surface (inner surface and outer surface) of the object 30 may be subjected to antistatic treatment prior to the operation of applying the liquid.
  • the inner surface (inside of the object 30) can be simply connected (contacted) with the electrical wiring from the voltage applying means (voltage power source) 50 to the outer surface 35 of the object 30.
  • the side surface 31 and the inner bottom surface 32) can be different from the liquid spray unit 20.
  • a voltage is applied between the object 30 and the liquid spray part 20 to generate an electrostatic force.
  • a tailor cone 60 is formed at the tip of the liquid nozzle 22 by the electrostatic force, and further, the liquid is detached from the tip of the liquid nozzle 22 by the electrostatic force and repeats electrostatic explosion to become an atomized liquid state. .
  • the whole inner surface 33 of the article 30 is in a state of a different polarity, and in the state of FIG. 4A, the different polarity portion is also present on the rear side outside the liquid nozzle 22.
  • an electric field is formed on the tip side of the liquid nozzle 22 so that the electrostatic force acts in the direction of pulling the liquid forward, and the liquid is directed toward the front as shown in FIG. Leaves.
  • liquid spraying part 20 when the liquid spraying part 20 is moved from the state of FIG. 4A to the back side in the insertion direction, liquid is applied to the inner side surface 31 on the inner bottom surface 32 side sequentially from the inner side surface 31 on the opening 34 side. Further, when the liquid spraying part 20 is moved to the back side in the insertion direction and approaches the inner bottom surface 32, as shown in FIG. The liquid is attracted to the inner bottom surface 32 by the electrostatic force.
  • the liquid spraying part 20 is moved in the insertion direction from the opening 34 side in the inner space of the object 30 to be coated, and the liquid separated from the liquid nozzle 22 with the inner surface 33 of the object 30 as a different polarity part is coated.
  • a liquid coating method for coating the inner surface 33 of 30 was shown.
  • the movement of the liquid spray unit 20 need not be limited to that performed in the insertion direction.
  • FIG. 4 (c) the state where the liquid spraying portion 20 is located at the back side of the internal space of the object 30 to be coated is started, and spraying of the liquid is started from there, and the opening 34 side (removal)
  • a liquid coating method may be used in which the liquid spraying unit 20 is moved in the direction (direction), and the liquid is applied (coated) to the inner surface 33.
  • the movement of the liquid spray unit 20 in the insertion direction and the removal direction is not limited to the movement of the liquid spray unit 20, and the object 30 may be moved. You may make it move both the part 20 and the to-be-coated object 30.
  • the liquid spray unit 20 moves in the insertion direction in which the liquid spray unit 20 is inserted into the internal space of the object to be coated 30 or the extraction direction in which the liquid spray unit 20 is extracted from the internal space in a relative positional relationship with the object to be coated 30.
  • the liquid spray unit 20 and the object to be coated 30 may be relatively moved so that the liquid is applied to the inner surface 33 of the object to be coated 30.
  • liquid spraying part 20 itself is realizable by a small size
  • the case where liquid spraying part 20 is supported by support part 10 and liquid spraying part 20 itself is moved in the internal space of article 30 is shown.
  • the liquid nozzle 22 and the mandrel 23 are long, and only the front end side of the liquid spray unit 20 is inserted into the internal space of the article to be coated 30. May be moved.
  • the liquid nozzle 22 and the object to be coated 30 may be relatively moved to apply the liquid to the inner surface 33 of the object to be coated 30 in the same manner as described for the liquid spray unit 20.
  • a mandrel 23 is used as a preferred configuration of the liquid spraying unit 20.
  • the liquid nozzle 22 is made of a conductive material, and the liquid nozzle 22 is connected to voltage applying means (voltage power source). ) 50 may be electrically connected to the liquid nozzle 22 itself as an electrode on the liquid spraying part 20 side, and the mandrel 23 may be omitted.
  • the liquid nozzle 22 may be moving in the internal space of the article to be coated 30. That is, in order to move the liquid nozzle 22 in the internal space of the object to be coated 30, the liquid spray unit 20 is not limited to being moved in the internal space of the object to be coated 30.
  • the liquid nozzle 22 is short and the liquid spraying section 20 is short, and the support section 10 supports the liquid spraying section 20 as necessary, so that the inside of the object to be coated 30 is reached.
  • the liquid spray unit 20 itself can be inserted into the space, for example, if the support unit 10 has a structure that can be added according to the required length, there will be no trouble and handling problems as described above. This is preferable because it is possible.
  • the inner shape (it is an internal diameter in the case of circular cross section) of the to-be-coated object 30 is a relatively small bottomed pipe shape.
  • the liquid spray unit 20 and the object to be coated 30 are moved relative to each other while the tip of the liquid nozzle 22 is located at a substantially equal central position, so that the liquid spray unit 20 (or the liquid nozzle 22) is covered. If it moves in the insertion direction or the removal direction as viewed relative to the coating material 30, the atomized liquid to be sprayed is applied evenly on the inner surface 33 (inner surface 31) of the coating material 30 (coating). Wear).
  • the position where the distance to the facing position is substantially equal may be set as the center position.
  • the liquid nozzle 22 is arranged slightly shifted from the center, and the distance from the liquid nozzle 22 to the inner surface 33 (inner surface 31). Is slightly different in the left-right direction and the vertical direction of the liquid nozzle 22, the inner surface 33 (the inner surface 31 and the inner bottom surface 32 that are separated from the liquid nozzle 22 in the left-right and up-down directions as a result of the spread of electrostatic explosion of the liquid, etc. ), Since the liquid to be sprayed approaches, liquid coating unevenness hardly occurs.
  • the entire inner surface 33 (the inner surface 31 and the inner bottom surface 32) is simply moved by moving the liquid nozzle 22 along substantially the center of the object 30 without rotating the object 30 with respect to the liquid nozzle 22.
  • the liquid can be applied satisfactorily, and there is an advantage that it is not necessary to provide a rotation mechanism for rotating the object 30 to be coated. However, it is not limited to not rotating the article 30 to be coated.
  • the tip opening 22b (see FIG. 1) of the liquid nozzle 22 is directed to the inner surface 31 side of the top, bottom, left, or right, the liquid spraying direction is biased. Therefore, as in the present embodiment shown in FIG. 4, the front end opening 22b (see FIG. 1) of the liquid nozzle 22 is forward when the insertion direction of the liquid spray unit 20 (liquid nozzle 22) is the front.
  • the liquid coating method is preferably a liquid coating method as in the second embodiment described below.
  • FIG. 6 is a diagram for explaining a liquid coating method according to the second embodiment of the present invention.
  • FIG. 6 (a) corresponds to FIG. 4 (a)
  • FIG. 6 (b) corresponds to FIG. 6 (c) is a diagram corresponding to FIG. 4 (c).
  • FIG. 6 only the article 30 and the liquid spray unit 20 are illustrated, and the support unit 10 and the like are omitted.
  • the liquid spray unit 20 (or the liquid nozzle 22) is not positioned at the center of the inner space as in the first embodiment, but dared.
  • Offset to either the top, bottom, left or right side that is, a position offset from the center position where the distance from the inner surface 33 (inner side surface 31) of the article 30 located on the outer periphery of the tip of the liquid nozzle 22 is substantially equal (liquid
  • the nozzle 22 is kept at a position closer to the circumferential direction of the inner surface 31 of the article 30 than the other part), and moved in the insertion direction (or take-out direction). To do.
  • FIG. 6 Offset to either the top, bottom, left or right side, that is, a position offset from the center position where the distance from the inner surface 33 (inner side surface 31) of the article 30 located on the outer periphery of the tip of the liquid nozzle 22 is substantially equal (liquid
  • the nozzle 22 is kept at a position closer to the circumferential direction of the inner surface 31 of the article 30 than the other part
  • the liquid spray unit 20 (or the liquid nozzle 22) and the object to be coated 30 are equidistant from the predetermined inner surface 33 along the predetermined inner surface 33 on the upper side of the object to be coated 30.
  • the liquid is applied to the inner surface 33 while relatively moving.
  • the liquid detached from the tip of the liquid nozzle 22 is applied to the inner surface 33 (inner surface 31) on the side close to the liquid nozzle 22, as shown in FIGS. 6 (a) and 6 (b).
  • the liquid to be applied becomes too thin, and coating unevenness is less likely to occur in the applied portion where the liquid is applied.
  • the liquid to be applied is avoided from becoming too thin on the inner bottom surface 32 as compared with a state where the liquid is applied so as to spread over the entire inner bottom surface 32 having a large area.
  • uneven coating is less likely to occur at the coated portion where the liquid is applied.
  • the liquid is applied only to a part of the inner surface 33. Therefore, in the second embodiment, the object 30 is applied to the liquid spraying unit 20 (or the liquid nozzle 22). The liquid is satisfactorily applied to the entire inner surface 33 by rotating.
  • the liquid spraying method of applying the liquid to the inner surface 33 of the object to be coated 30 while rotating the object to be coated 30 while rotating the object to be coated 30 while offsetting the liquid spray unit 20 on the upper side is shown.
  • the offset of the liquid spray unit 20 is not limited to the upper side, and may be the left side, the right side, the lower side, and the like.
  • the liquid spraying unit 20 is sequentially offset vertically and horizontally, and the liquid spraying unit 20 is moved in the offset state so that the liquid is applied to the entire inner surface 33.
  • the liquid spray unit 20 is moved in the state offset to the upper side, the liquid spray unit 20 is moved in the state offset to the left side, and the liquid spray unit 20 is moved in the state offset to the lower side. Furthermore, the liquid spray unit 20 may be moved while being offset to the right so that the entire inner surface 33 is coated with liquid.
  • the object to be coated is used. It is preferable to rotate 30.
  • the front end opening 22b (see FIG. 1) of the liquid nozzle 22 may be directed to the inner side 31 on the upper, lower, left, or right side.
  • the liquid can be satisfactorily applied to the inner side surface 31, it is difficult to apply the liquid to the inner bottom surface 32, so even in the case of the second embodiment, as described in the first embodiment, the tip of the liquid nozzle 22 is used.
  • the opening 22b (see FIG. 1) spray the liquid so that it faces forward when the insertion direction of the liquid spraying unit 20 (liquid nozzle 22) is the front.
  • the present invention is not limited to the above-described specific embodiments.
  • the case where the inner surface 31 is a straight tube and has a flat inner bottom surface 32 as the article to be coated 30 has been described as an example.
  • the case where the opening 34 of the article 30 is substantially the same as the inner shape of the inner surface 31 is shown.
  • the object 30 may be an opening whose opening 34 is smaller than the inner shape of the internal space, and the inner surface 33 has curved surfaces (for example, the opening 34 in FIG. 7). Or a curved surface as seen on the side or inner bottom surface 32).
  • the atomized liquid is sprayed onto the inner surface 33, and the atomized liquid contacting the inner surface 33 is applied to the inner surface 33, as shown in FIG.
  • it is difficult to spray the liquid onto a shape portion see the shape on the opening 34 side in FIGS. It is difficult to apply and uneven coating is likely to occur.
  • each liquid fine particle of the atomized liquid to be sprayed is in a charged state, and the inner surface 33 of the object to be coated 30 draws the charged liquid fine particles (liquid spray unit 20). 7 (even if the shape of the object 30 is as shown in FIG. 7), as shown in FIG. Liquid can be applied efficiently to areas that are prone to uneven coating.
  • the liquid spraying unit 20 (or the liquid nozzle 22) is inserted in the insertion direction, and the liquid spraying is performed up to the vicinity of the inner bottom surface 32 as shown in FIG.
  • the part 20 or the liquid nozzle 22
  • the liquid coating method according to the present invention includes the case where such an inner surface 33 has such a through hole.
  • the present invention can be applied to the inner surface 33 (inner side surface 31) of the pipe-shaped object 30 having no inner bottom surface 32, and even a bent pipe or the like is in the inner space. Therefore, it is only necessary to move the liquid spraying part 20 (or the liquid nozzle 22), so there is no problem even if the pipe itself is bent. Accordingly, the object 30 to which the liquid coating method of the present invention is applied includes such a bent pipe shape.
  • liquid applied to the inner surface 33 of the article 30 is not limited to the paint, and it is needless to say that a liquid corresponding to the application may be selected as appropriate.
  • a voltage is applied between a liquid spraying part (20) having a liquid nozzle (22) and a different polarity part with respect to the liquid spraying part, and the liquid spraying part Of the object to be coated (30) having an internal space by bringing the liquid into a charged state by an electrostatic force generated between the electrode and the different polar part, and separating the liquid from the tip of the liquid nozzle by the electrostatic force.
  • a liquid application method for applying the liquid to an inner surface (33), wherein the liquid nozzle is positioned in the inner space of the object to be coated (30), and the inner surface (33) of the object to be coated (30). Is applied to the inner surface of the article to be coated.
  • the electrostatic spraying section has a mandrel in the liquid nozzle.
  • the liquid nozzle (22) is equidistant from the predetermined inner surface along the predetermined inner surface (33) of the article (30) to be coated.
  • the liquid nozzle and the object to be coated are moved relative to each other to apply the liquid to the inner surface (33) of the object to be coated.
  • the liquid nozzle (22) is inserted into the internal space in a relative positional relationship with the object (30) to be coated.
  • the liquid nozzle and the object to be coated are moved relative to each other so as to move in the inserting direction or the direction of taking out from the internal space, and the liquid is applied to the inner surface (33) of the object to be coated.
  • the liquid nozzle (22) and the object to be coated (30) are moved relative to each other on the outer periphery of the tip of the liquid nozzle. This is performed while maintaining the state where the tip of the liquid nozzle is located at the center position where the distance from the inner surface (33) of the object is substantially equal.
  • the article (30) to be coated is rotated.
  • the article (30) to be coated is not rotated.
  • the distance from the inner surface (33) of the article to be coated (30) located on the outer periphery of the tip of the liquid nozzle (22) is In a state where the tip of the liquid nozzle is located at a position that is offset from the center position to be equal, the liquid nozzle is inserted in the internal space or in an extraction direction that is extracted from the internal space.
  • the object to be coated is rotated while moving.
  • the tip opening (22b) of the liquid nozzle from which the liquid comes out is the front
  • the liquid nozzle is moved at least in the insertion direction or the extraction direction in the internal space of the object to be coated (30) so as to face the liquid, and the liquid is applied to the inner surface (33) of the object to be coated.
  • the article (30) to be coated is a tank having a constant or non-constant inner surface diameter, or a straight or bent pipe.
  • the article to be coated (30) is a container having a through hole for inserting instruments.
  • the through hole is 150 mm or less.
  • a voltage is applied between the liquid spraying part (20) having the liquid nozzle (22) and a different polarity part with respect to the liquid spraying part, and the liquid spraying part Of the object to be coated (30) having an internal space by bringing the liquid into a charged state by an electrostatic force generated between the electrode and the different polar part, and separating the liquid from the tip of the liquid nozzle by the electrostatic force.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2006-263591
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2009-273976
  • Patent Document 3 Japanese Patent Application Laid-Open No. 2010-005533

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

L'invention concerne un procédé d'application de liquide qui permet d'appliquer une tension entre une partie pulvérisation de liquide, ayant une buse de liquide, et une partie de polarité différente de la partie pulvérisation de liquide, et qui consiste à placer le liquide dans un état chargé par force électrostatique générée entre la partie pulvérisation de liquide et la partie de polarité différente, ainsi qu'à séparer le liquide de l'extrémité de la buse de liquide par la force électrostatique, et à appliquer le liquide sur la surface interne d'un objet d'application ayant un espace interne, le procédé d'application de liquide permettant le positionnement de la buse de liquide dans l'espace interne de l'objet d'application, et l'application du liquide, séparé à l'aide de la surface interne de l'objet d'application en tant que partie de polarité différente, sur la surface interne de l'objet d'application.
PCT/JP2016/073959 2015-08-28 2016-08-17 Procédé d'application de liquide WO2017038461A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015168655A JP6613481B2 (ja) 2015-08-28 2015-08-28 液体塗着方法
JP2015-168655 2015-08-28

Publications (1)

Publication Number Publication Date
WO2017038461A1 true WO2017038461A1 (fr) 2017-03-09

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JP (1) JP6613481B2 (fr)
WO (1) WO2017038461A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5040893B1 (fr) * 1970-12-23 1975-12-27
JPS52164161U (fr) * 1977-05-11 1977-12-13
JPS59143003U (ja) * 1983-03-15 1984-09-25 旭精工株式会社 ゲ−ム機用操作レバ−
JPS61201787A (ja) * 1985-03-04 1986-09-06 Hitachi Ltd ほうろう粉体静電施釉方法
JP2002320904A (ja) * 2001-04-25 2002-11-05 Nordson Kk 有底缶体内面の粉体塗装方法
JP2014031801A (ja) * 2012-08-01 2014-02-20 Kurimoto Ltd コンクリート管およびその製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5040893B1 (fr) * 1970-12-23 1975-12-27
JPS52164161U (fr) * 1977-05-11 1977-12-13
JPS59143003U (ja) * 1983-03-15 1984-09-25 旭精工株式会社 ゲ−ム機用操作レバ−
JPS61201787A (ja) * 1985-03-04 1986-09-06 Hitachi Ltd ほうろう粉体静電施釉方法
JP2002320904A (ja) * 2001-04-25 2002-11-05 Nordson Kk 有底缶体内面の粉体塗装方法
JP2014031801A (ja) * 2012-08-01 2014-02-20 Kurimoto Ltd コンクリート管およびその製造方法

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