JP6634645B2 - Masking jig for electrostatic spraying device, electrostatic spraying device provided with the masking jig, and electrostatic spraying method using the masking jig - Google Patents

Description

  The present invention relates to a masking jig for an electrostatic spraying device, an electrostatic spraying device provided with the masking jig, and an electrostatic spraying method using the masking jig.

  Conventionally, a nozzle that sprays in a state where a voltage is applied to the solution material, and a mask that is disposed near the substrate between the nozzle and the substrate and includes an opening having a predetermined opening pattern, The sprayed solution material is deposited as a thin film on the substrate, and a portion of the opening of the mask on the nozzle side has a larger opening area than a portion of the opening of the mask on the substrate side. There is known a thin film forming apparatus (see Patent Document 1).

  In Patent Literature 1, the use of the mask as described above causes a problem that the transferability of the opening pattern of the mask deteriorates, that is, the solution material causes electrostatic repulsion at the opening edge of the mask and is brought to the inside of the opening. The problem of the instability of the linearity of the solution material deposited along the opening edge is solved.

JP 2014-147991 A

By using a mask as disclosed in Patent Document 1, the solution material is less likely to cause electrostatic repulsion at the opening edge of the mask, and a solution material (hereinafter, also referred to as a liquid) deposited near the opening edge of the mask. Although the linearity along the opening edge of this is greatly improved, further improvement is required.
In addition, the liquid deposited near the opening edge includes the liquid that is deposited by bringing the liquid outside the opening to the opening side, and the thickness of the liquid deposited near the opening edge is larger than that of other portions. There is also a problem that the thickness tends to be thick.

  The present invention has been made in view of such circumstances, and a boundary between an application part to which a liquid to be coated is applied and a non-application part to which no liquid is applied is formed with high accuracy, and the boundary between the application parts is formed. A first object is to provide a masking jig for an electrostatic spraying device that can suppress an increase in the thickness of a liquid applied to the vicinity, and an electrostatic spraying device provided with the masking jig, and A second object of the present invention is to provide an electrostatic spraying method using the masking jig.

The present invention is grasped by the following configurations in order to achieve the above object.
(1) The masking jig according to the present invention is characterized in that the liquid is charged in a charged state by an electrostatic force generated by applying a voltage between the liquid spraying part and a different polarity part having a different polarity from the liquid spraying part. A masking jig for use in an electrostatic spraying device that separates from a spraying unit and sprays an atomized liquid on an object to be coated, wherein the masking jig includes a masking auxiliary body and a separate masking main body. The body is arranged so as to be in contact with the object to be coated, so as to define a boundary between an application portion to which the liquid to be applied is applied and a non-application portion to which the liquid to be applied is not applied, and the masking is performed. The main body is disposed so as to cover at least the non-coating portion of the object not covered by the masking auxiliary body on the non-coating portion side of the boundary, and the masking main body is formed of an insulating material using the liquid. Repels electrification It is formed so as to condition, the masking auxiliary body, wherein the liquid is to be coated wear.
(2) In the above configuration (1), the masking auxiliary body is formed of a conductive material or an antistatic material having a surface resistance of 10 ¹⁰ Ω or less so that the liquid can be applied.
(3) In the above configuration (1), the masking auxiliary body is formed of an insulating material to a thickness of 0.25 mm or less so that the liquid can be applied.
(4) In any one of the above (1) to (3), the masking auxiliary body can be detachably attached to the masking main body.
(5) In any one of the constitutions (1) to (4), the masking auxiliary body can be detachably attached to the object to be coated.
(6) The masking jig of the present invention is characterized in that the liquid is charged in a charged state by an electrostatic force generated by applying a voltage between the liquid spraying part and a different polarity part having a different polarity to the liquid spraying part. A masking jig for use in an electrostatic spraying device that is separated from the spraying unit and sprays an atomized liquid on an object to be coated, wherein the masking jig includes a masking auxiliary body and a masking main body, and the masking auxiliary body includes: The masking body is disposed so as to be in contact with the object to be defined, so as to define a boundary between an application part that applies the liquid of the object to be coated and a non-application part that does not apply the liquid of the object to be coated. The masking body is provided integrally with the masking auxiliary body on the non-coating part side relative to the boundary so as not to be detachable, and is arranged so as to cover at least the non-coating part of the object to be coated which is not covered by the masking auxiliary body. , Using an insulating material, wherein is formed to be charged state to repel liquids, the masking auxiliary body, using a conductive material or 10 ¹⁰ Omega antistatic material following the surface resistance, said liquid It is formed so as to be applied.
(7) In any one of the constitutions (1) to (6), the masking main body has a thickness equal to or more than a predetermined thickness so as to be in a charged state for repelling the liquid.
(8) In the above configuration (7), the predetermined thickness of the masking main body is 0.5 mm or more.
(9) The electrostatic spraying device of the present invention includes the masking jig of any one of the above (1) to (8).
(10) In the electrostatic spraying method of the present invention, the liquid may be charged in a charged state by an electrostatic force generated by applying a voltage between the liquid spraying section and a different polarity section which is a different polarity to the liquid spraying section. Using an electrostatic spraying device that separates from the liquid spraying section and sprays the atomized liquid onto the object, the masking jig covers the non-applied portion of the object to be coated with the liquid without applying the liquid. An electrostatic spraying method of applying the liquid to an application unit that applies the liquid of an object, wherein the masking jig includes a masking auxiliary body that defines a boundary between the application unit and the non-application unit; A masking main body which is disposed closer to the non-coating portion side and is provided so as to cover at least the non-coating portion of the object to be coated which is not covered by the masking auxiliary body.

  ADVANTAGE OF THE INVENTION According to this invention, while the boundary of the application part which apply | coats the liquid of a to-be-coated object and the non-application part which does not apply liquid is formed precisely, the thickness of the liquid apply | coated near the boundary of an application part increases. Provided is a masking jig for an electrostatic spraying device capable of suppressing the above, and an electrostatic spraying device provided with the masking jig and an electrostatic spraying method using the masking jig are provided.

It is a perspective view showing the whole electrostatic spraying device of a 1st embodiment concerning the present invention. It is a sectional view showing the whole electrostatic spraying device of a 1st embodiment concerning the present invention. It is sectional drawing of the liquid spray part of 1st Embodiment which concerns on this invention. It is an enlarged view of the tip side of the liquid spraying part of FIG. 3, (a) is a figure which shows the case where the front-end | tip of a mandrel is located back, (b) is the front-end | tip of the mandrel located ahead than (a). FIG. It is an exploded sectional view of the masking jig of a 1st embodiment concerning the present invention. It is a figure which shows the modification of the masking jig of 1st Embodiment which concerns on this invention, Comprising: It is a figure which shows the masking jig which removed the masking main body and the masking auxiliary body integrally. It is a perspective view showing the masking jig of a 2nd embodiment concerning the present invention. It is sectional drawing which shows the masking jig of 2nd Embodiment concerning this invention.

Hereinafter, embodiments for implementing the present invention (hereinafter, embodiments) will be described in detail with reference to the accompanying drawings. Note that the same elements are denoted by the same reference numerals throughout the description of the embodiments.
Unless otherwise specified, expressions such as “front (end)” and “front (direction)” indicate the liquid spray direction side of each member and the like, and “rear (end)” and “rear (direction)” The expression such as "" indicates the opposite side of the liquid spray direction in each member or the like.

(1st Embodiment)
FIG. 1 is a perspective view illustrating the overall configuration of the electrostatic spraying device 10 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating the overall configuration of the electrostatic spraying device 10.
As shown in FIGS. 1 and 2, the electrostatic spraying device 10 has a different polarity from the liquid spraying unit 20 having the liquid nozzle 22, the masking jig 30, and the liquid spraying unit 20 and the liquid spraying unit 20. A voltage application unit (voltage power supply) 50 for applying a voltage between the different pole unit 40 and the other pole unit 40.

  In the present embodiment, the case where the electric wiring from the voltage applying means (voltage power supply) 50 is directly connected to the object to be coated and the object to be coated itself is the different pole portion 40 is shown. An electric wire from a voltage applying means (voltage power supply) 50 is connected to a mounting portion (not shown) on which the coating material is mounted, and this mounting portion is used as the different pole portion 40 via the mounting portion. The object may be electrically connected to the voltage applying means (voltage power supply) 50.

An object to be coated, which is to be the different pole portion 40, is grounded by the grounding means 60.
Although the grounding means 60 is not an essential requirement, it is preferable to provide the grounding means 60 from the viewpoint of safety because it may be touched by an operator in the case of an object to be coated.

(Liquid spray section)
FIG. 3 is a cross-sectional view showing only the liquid spray unit 20.
Note that FIG. 3 also illustrates a state in which a liquid such as paint is sprayed from the liquid spray unit 20 as described later.
As shown in FIG. 3, the liquid spraying unit 20 includes a body 21 made of an insulating material having a liquid flow path 21 b having a liquid supply port 21 a to which a liquid is supplied, and a liquid flow through the body 21 formed with a through hole. 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 a through hole of the liquid nozzle 22. Have.

The body 21 is provided with a hole 21c communicating with the liquid flow path 21b in order to take out the mandrel 23 to the rear end side. In the hole 21c, a gap between the mandrel 23 and the mandrel 23 is sealed. A seal member 24 for preventing liquid from leaking is provided.
In the present embodiment, an O-ring is used as the seal member 24. However, the present invention is not limited to the O-ring, and any seal can be used.

  At the rear end of the mandrel 23 located on the rear end side of the body portion 21 through the hole 21c, a knob 23a made of an insulating material is provided, and is provided so as to penetrate substantially the center of the knob 23a. An electric wiring connection portion 23b made of a conductive material is provided.

As shown in FIGS. 1 and 2, the electric wiring from the voltage applying means 50 is connected to the electric wiring connecting portion 23b.
Then, as shown in FIG. 3, the mandrel 23 is electrically connected to the electric wiring connection part 23b by making the electric wiring connection part 23b contact the mandrel 23.

  In the present embodiment, the mandrel 23 is an electrode on the side of the liquid spraying section 20. However, for example, the liquid nozzle 22 of the liquid spraying section 20 is made of a conductive material, and The electrical wiring may be connected, and the liquid nozzle 22 may be used as an electrode on the liquid spray unit 20 side.

  A female screw structure 21e for screwing and connecting the knob 23a is provided on the inner peripheral surface of the rear end opening 21d of the body 21. On the other hand, a male screw is formed on the outer peripheral surface of the distal end of the knob 23a. A structure 23c is provided.

Therefore, the mandrel 23 is detachably attached to the body 21 by screwing the male screw structure 23c on the outer peripheral end of the knob 23a into the female screw structure 21e of the rear end opening 21d of the body 21.
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.

Here, in general, the nozzle of the electrostatic spraying device that sprays the liquid is a fine liquid flow path in which the diameter of the through hole through which the liquid flows is small.
This is presumably because if the opening diameter of the nozzle tip from which the liquid flows out is large, a stable liquid atomization state cannot be obtained.
For example, generally, the opening diameter of the nozzle tip is set to less than 0.1 mm.

  Therefore, as soon as the liquid dries, the opening at the tip of the nozzle is clogged. However, since the opening diameter is small, there is a problem that it is difficult to eliminate the clogging.

However, although the reason will be described later, it has been found that by using the mandrel 23, it is possible to perform good atomization even when the opening diameter of the nozzle tip is set to a large opening diameter as compared with the related art. The opening diameter of the opening 22b at the tip of the liquid nozzle 22 of the present embodiment is made as large as 0.2 mm.
As a result, the frequency of occurrence of clogging can be significantly reduced.

  In addition, the opening diameter of the opening 22b of the liquid nozzle 22 is not limited to 0.2 mm. In the case of using the mandrel 23, there is no problem even if the opening diameter is about 1 mm.

  The opening diameter of the opening 22b of the liquid nozzle 22 is preferably 0.1 mm or more, more preferably 0.2 mm or more, considering that clogging hardly occurs and cleaning can be performed even if clogging occurs. Preferably, it is larger than 0.2 mm.

  On the other hand, the opening diameter of the opening 22b of the liquid nozzle 22 is preferably 1.0 mm or less, more preferably 0.8 mm or less, and still more preferably 0.5 mm or less, in consideration of atomization stability. Is good.

Further, in the present embodiment, as described above, since the mandrel 23 can be moved in the front-rear direction, even if clogging occurs, clogging can be eliminated by moving the mandrel 23.
Further, since the inside diameter of the through hole of the liquid nozzle 22 is made large enough to arrange the mandrel 23, the mandrel 23 can be removed and the washing liquid can be flowed in a large amount for washing.

  FIG. 4 is an enlarged view in which the distal end side of the liquid spraying section 20 is enlarged. FIG. 4A shows a case where the distal end surface 23d of the mandrel 23 is located rearward, and FIG. This is a case where the tip end surface 23d of the mandrel 23 is located in front of the state of FIG.

  As shown in FIG. 4A, the liquid nozzle 22 has a tapered inner diameter portion (see a range A) in which the inner diameter is tapered toward the opening 22b side and the taper angle is α. 23 has a tapered portion (see range B) in which the outer diameter decreases toward the distal end surface 23d and the taper angle is β.

The taper angle α of the tapered inner diameter portion of the liquid nozzle 22 is larger than the taper angle β of the tapered portion of the mandrel 23.
The diameter of the tip surface 23d of the mandrel 23 is smaller than the opening diameter of the opening 22b of the liquid nozzle 22, but the diameter of the tapered portion of the mandrel 23 gradually decreases toward the rear end. The liquid nozzle 22 is formed to have a portion having a diameter larger than the opening diameter of the opening 22 b of the liquid nozzle 22.

  As described above, by forming the distal ends of the liquid nozzle 22 and the mandrel 23, as can be seen by comparing FIGS. 4 (a) and 4 (b), the liquid nozzle is moved by moving the mandrel 23 back and forth. The width of the gap formed by the mandrel 22 and the mandrel 23 can be adjusted, and the amount of liquid flowing out of the opening 22b of the liquid nozzle 22 can be adjusted.

Further, by moving the mandrel 23 further forward than in the state shown in FIG. 4B, the mandrel 23 comes into contact with the inner peripheral surface of the liquid nozzle 22 and closes the 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 out by closing the opening 22b of the liquid nozzle 22 with the mandrel 23 in a state where the liquid such as paint is not sprayed. Clogging can be suppressed.

(Different pole part 40)
In the present embodiment, as described above, the case where the object to be coated is used for the different pole part 40 is shown, and the electric wiring on the opposite side to the mandrel 23 of the voltage applying means (voltage power supply) 50 is connected. By being connected to the object to be coated, the object to be coated itself has a different polarity with respect to the liquid spray unit 20.

  However, as mentioned briefly above, for example, when the object to be coated is transferred to a position where a liquid such as paint is applied by a transfer device or the like, the electric wiring from the voltage applying means 50 is connected to the transfer device. The object to be coated may be electrically connected to the voltage applying means 50 via the mounting portion so as to be connected to the mounting portion on which the object to be coated is mounted.

  Next, a state in which the liquid is sprayed from the liquid spraying section 20 will be described first with reference to FIG. 3, and then the sprayed liquid will be applied only to a predetermined range of the object to be coated. The masking jig 30 will be described.

  The liquid supplied to the liquid supply port 21 a of the body 21 is supplied to the tip side of the liquid nozzle 22, and the static electricity generated by the voltage applied between the different pole part 40 (substrate) and the mandrel 23. By the force, it is pulled forward and separates and atomizes forward.

  In addition, the supply of the liquid only needs to be sequentially supplied with the liquid lost from the liquid spraying unit 20 by being consumed by the spraying, and the opening 22b of the liquid nozzle 22 (more precisely, the opening 22b It is not necessary to supply the liquid under pressure such that the liquid is ejected from the gap between the mandrel 23). In a state where the liquid is ejected vigorously, atomization may not be possible.

  More specifically, the electrostatic force that pulls the liquid forward balances the adhesive force due to surface tension and viscosity on the distal end surface 23d of the mandrel 23 and the outer peripheral edge 22a of the liquid nozzle 22 as shown in FIG. In this manner, the tailor cone 80 in which the liquid supplied to the front end side of the liquid nozzle 22 has a conical shape at the front end is formed.

The tailor cone 80 is formed such that positive / negative charges are separated in the liquid by the action of the electric field, and the meniscus at the tip of the liquid nozzle 22 charged with the excess charge is deformed to have a conical shape.
Then, the liquid is pulled straight from the tip of the tailor cone 80 by the electrostatic force, and then the liquid is sprayed over a wide range by the electrostatic explosion.

  The sprayed liquid, that is, the liquid that has separated from the liquid nozzle 22 and has become liquid particles, has a significantly larger area in contact with air as compared with the state before the separation, so that the vaporization of the solvent is promoted. As the distance between the charged electrons decreases with the vaporization of the liquid, electrostatic repulsion (electrostatic explosion) occurs and the liquid particles are further divided into liquid particles having a small particle diameter.

When this fission occurs, the surface area that comes into contact with air is further increased compared to before the fission, which promotes the vaporization of the solvent, generates an electrostatic explosion in the same manner as described above, and furthermore, the liquid having a small particle diameter. Split into particles.
The liquid is atomized by repeating such an electrostatic explosion.

Here, in the present embodiment, the mandrel 23 is provided in the liquid nozzle 22.
If this mandrel 23 is not provided as in the conventional electrostatic spraying device, the portion to which the liquid can adhere is only the outer peripheral edge 22a of the front end of the liquid nozzle 22.

  If the opening diameter of the opening 22b of the liquid nozzle 22 is increased in such a state, the portion to which the liquid can be attached is only the outer peripheral edge 22a of the liquid nozzle 22. It is easy to fluctuate, and it is not possible to form a clean tailor cone 80, or to maintain the tailor cone 80 itself, so that the stability of the liquid particles detached from the liquid nozzle 22 (particle size, number, charged state, etc.) Is not obtained, and as a result, stable atomization of the liquid cannot be performed.

On the other hand, in the present embodiment, the mandrel 23 is disposed in the liquid nozzle 22, and the liquid adheres not only to the tip outer peripheral edge 22 a of the liquid nozzle 22 but also to the tip end surface 23 d of the mandrel 23.
Therefore, even if the opening diameter of the opening 22b of the liquid nozzle 22 is large, the tip surface 23d of the mandrel 23 to which the liquid can adhere is present at the center of the opening 22b, so that a stable tailor cone 80 can be formed. It is considered that stable atomization of the liquid can be achieved.

  If the tip surface 23d of the mandrel 23 goes forward too far from the tip outer peripheral edge 22a of the liquid nozzle 22 (that is, the tip surface of the opening 22b of the liquid nozzle 22), the electric field hardly acts on the liquid coming out of the liquid nozzle 22. On the other hand, if the distal end surface 23d of the mandrel 23 is too far back from the distal end surface of the opening 22b of the liquid nozzle 22, the state is the same as the case where there is no portion to which liquid can be attached at the center of the opening 22b.

  From this, the position of the distal end surface 23d of the mandrel 23 is set such that, in a state where the liquid is sprayed, the liquid nozzle 22 is positioned in the front-back direction along the central axis of the mandrel 23 with respect to the distal end surface of the opening 22b of the liquid nozzle 22. Preferably, it is located within 10 times, more preferably within 5 times, and more preferably within 3 times of the opening diameter of the opening 22b at the tip of 22. It is suitable.

  For example, in the present embodiment, the opening diameter of the opening 22b of the liquid nozzle 22 is 0.2 mm, and when the electrostatic force is not taken into consideration, the liquid that has come out of the 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 is preferably present near the liquid so that an electric field (electrostatic force) acts on the liquid coming out at the tip of the liquid nozzle 22 to form a conical tailor cone 80. Therefore, it is preferable that the tip of the mandrel 23 be positioned within 2 mm forward (in the direction of emergence) from the tip end surface of the opening 22b of the liquid nozzle 22. It is preferable that the liquid nozzle 22 be located within 2 mm rearward (retracting direction) from the distal end surface of the opening 22b.

By providing the mandrel 23 as described above, stable atomization of the liquid can be performed even if the opening diameter of the opening 22b of the liquid nozzle 22 is increased.
For this reason, the opening diameter of the opening 22b of the liquid nozzle 22 can be made large so that clogging can be suppressed.
Further, since the opening diameter of the opening 22b of the liquid nozzle 22 can be increased, the liquid nozzle 22 can be manufactured by machining.

  In this embodiment, the tip of the mandrel 23 is a flat surface as the tip surface 23d. However, the tip of the mandrel 23 does not necessarily have to be a flat plane, and the stable tailor cone 80 can be formed. For example, the end of the mandrel 23 may have a curved surface protruding toward the front side like an R shape.

  The liquid sprayed from the liquid spraying section 20 (liquid nozzle 22) in this way becomes an atomized liquid while repeating electrostatic explosion, and since the atomized liquid is in a charged state, the different electrode section 40 The substrate is attracted to the (substrate) side by electrostatic force and is applied to the substrate.

(Masking jig)
As shown in FIGS. 1 and 2, the masking jig 30 includes a masking main body 31 using an insulating material and a masking auxiliary body 32.
In the present embodiment, since the object to be coated constitutes the different pole portion 40, in describing the object to be coated, the following description will be given using the same reference numeral as the different electrode portion as the object to be coated 40. .

The masking auxiliary body 32 has a circular opening 32a in the center through which the liquid sprayed passes.
That is, the present embodiment exemplifies a case in which the liquid is applied onto the object 40 in a circular pattern.

Here, as shown in FIG. 2, the masking auxiliary body 32 is disposed so as to be in contact with the object 40, and does not apply the liquid of the object 40 and the application unit 41 that applies the liquid of the object 40. A boundary 43 with the non-application portion 42 is defined.
That is, the masking jig 30 is a portion where the masking auxiliary body 32 is arranged so as to come into contact with the workpiece 40 so as to define the boundary 43 between the application section 41 and the non-application section 42.

  On the other hand, as can be seen from an exploded sectional view of the masking jig 30 shown in FIG. 5, the masking jig 30 of the present embodiment is such that the masking auxiliary body 32 and the masking main body 31 are separate bodies. An opening 31a to which the masking auxiliary body 32 is detachably attached is formed, and the masking auxiliary body 32 is detachably attached to the opening 31a.

With such a configuration, as shown in FIG. 2, the masking main body 31 has at least the non-coating portion 42 of the coating target 40 that is not covered by the masking auxiliary body 32 on the non-coating portion 42 side of the boundary 43. Is arranged on the object 40 so as to cover the object.
That is, in the masking jig 30, the masking main body 31 is a portion arranged so as to cover at least the non-applied portion 42 of the object 40 not covered by the masking auxiliary body 32 on the non-applied portion 42 side than the boundary 43. ing.

As described above, the masking body 31 is made of an insulating material.
The masking body 31 is charged in the same state as the liquid whose surface is sprayed by the electrostatic force generated by the voltage applied between the object 40 and the liquid spraying section 20 (that is, the liquid is charged to a positive charge). If the surface is charged positively, the surface is charged to a positive charge, and if the liquid is charged negatively, the surface is charged to a negative charge).

For example, the predetermined thickness is preferably 0.5 mm or more, and more preferably 1.0 mm or more.
As described above, when the thickness is increased and polarization is easily caused, the masking main body 31 is in a favorable charged state in which the easily charged liquid is repelled, and the liquid is prevented from being applied on the masking main body 31 or reduced. can do.
For this reason, it is possible to greatly reduce the number of times of cleaning the masking main body.

On the other hand, the masking auxiliary body 32 is formed of a conductive material or an antistatic material having a surface resistance of 10 ¹⁰ Ω or less so that the liquid to be sprayed can be applied.

  As described above, since the masking auxiliary body 32 is disposed so as to be in contact with the object 40, the masking auxiliary body 32 can be regarded as having the same potential as the object 40, that is, the masking auxiliary body 32 is electrically potential-covered. It is in a state where it can be regarded as a part of the paint 40.

Therefore, the sprayed liquid is not collected on the center side of the opening 32a of the masking auxiliary body 32 due to the electrostatic repulsion, and the liquid sprayed on the masking auxiliary body 32 that has come off from the opening 32a does not The liquid applied on the body 32 and the liquid sprayed on the opening 32a are applied on the object 40.
Therefore, the liquid sprayed to the outside of the opening 32a is prevented from being applied to the application portion 41 near the boundary 43 of the workpiece 40, and the thickness of the applied liquid is prevented from becoming thicker than other portions. Is done.

  Further, since the liquid is not repelled at the edge of the opening 32a, the liquid is applied neatly up to the boundary 43, so that the boundary 43 between the non-application portion 42 and the application portion 41 is precisely formed. It can be formed.

In the present embodiment, the masking body 31 is a flat plate. However, the masking body 31 itself may have any shape, and the shape of the plate may be adjusted to the shape of the article 40 to be coated. It may be formed to be curved.
Further, the thickness of the masking body 31 may not be uniform, and may be any thickness that can prevent and reduce the application of the liquid.

Further, the present embodiment shows a case where the masking auxiliary body 32 is detachably attached to the opening 31a of the masking main body 31.
However, depending on the state of the application part 41 and the non-application part 42 of the article 40, the masking auxiliary body 32 may be provided on the outer peripheral edge 31b (see FIG. 1) outside the masking main body 31 without providing the opening 31a in the masking main body 31. May be detachably attached, and the masking auxiliary body 32 may be detachably attached to both the opening 31a and the outer peripheral edge 31b.

  As described above, since the liquid is applied to the masking auxiliary body 32, the masking auxiliary body 32 is detachably attached in this manner so that only the masking auxiliary body 32 is removed and washed. It becomes possible to improve workability.

However, from the viewpoint of good liquid application, the masking auxiliary body 32 does not need to be detachably attached to the masking main body 31.
Therefore, for example, as shown in FIG. 6, the masking auxiliary body 32 and the masking main body 31 may be irremovably integrated.
Even in this case, as compared with the case where the entire masking jig can be coated with the liquid, only the portion of the masking auxiliary body 32 needs to be partially cleaned, so that the working efficiency is greatly improved. It becomes possible.

Such a masking jig 30 in which the masking auxiliary body 32 and the masking main body 31 are unremovably integrated is formed by, for example, two-color molding using a conductive plastic material and an insulating plastic material. It is possible.
As another method, the masking auxiliary body 32 is made of a conductive material or an antistatic material having a surface resistance of 10 ¹⁰ Ω or less, and the masking auxiliary body 32 is formed by insert molding using an insulating plastic material. To form a non-removably integrated masking main body 31.

  By the way, the masking main body 31 is configured such that the liquid is difficult to apply from the viewpoint of applying the liquid, but cannot completely prevent the application of the liquid.

  For example, there is a case where some liquid is applied during the application operation, and a case where the liquid floating around is applied when the application operation is completed and no electrostatic force is generated. .

Therefore, since the masking main body 31 is exposed to a solvent or the like, it is preferable that the masking main body 31 be formed using a material having excellent solvent resistance among insulating materials.
Therefore, for the masking body 31, it is preferable to use, for example, a material having excellent solvent resistance, such as polyethylene, polypropylene, polyphenylene sulfide, polyethylene terephthalate, or a fluororesin.

(2nd Embodiment)
Hereinafter, the second embodiment will be described.
In the second embodiment as well, the basic configurations (the liquid spray unit 20, the different electrode unit 40 (substrate to be coated), and the masking main body 31) are the same as those in the first embodiment, and the configuration of the masking auxiliary body 32 is different. .

FIG. 7 is a perspective view showing the masking jig 30 of the second embodiment, and FIG. 8 is a sectional view of the masking jig 30 of the second embodiment.
In FIG. 7, the object to be coated 40 is not shown, but as shown in FIG. 8, also in the second embodiment, the masking auxiliary body 32 has the object to be coated 40 and the peripheral edge 35 of the opening 32 a (see FIG. 7). In contact.

The masking auxiliary body 32 of the second embodiment is formed as a thin film having an opening 32a.
Then, the masking auxiliary body 32 is detachably attached to both the opening edge of the masking main body 31 and the object 40 by giving an adhesive property to one surface.

It is preferable that the masking auxiliary body 32 be formed of a conductive material or an antistatic material having a surface resistance of 10 ¹⁰ Ω or less. .
When an insulating material is used for the masking auxiliary body 32, the thickness is reduced so that a liquid can be applied onto the masking auxiliary body 32.

Specifically, in order to prevent the action of repelling the charged liquid due to polarization from occurring significantly, the thickness of the masking body 31 should be less than half the preferred thickness, that is, 0.25 mm or less. It is more preferable that the thickness be 0.2 mm or less, and it is more preferable that the thickness be 0.15 mm or less.
In this way, even when the masking auxiliary body 32 is made of an insulating material, the liquid is satisfactorily applied onto the masking auxiliary body 32, that is, the charged liquid is not repelled, The same effects as in the first embodiment can be obtained.

  As in the second embodiment, if the masking assisting body 32 can be manufactured inexpensively as a thin film, the masking assisting body 32 can be used like a disposable instead of being washed. Become.

  For example, in the case of coating on the object to be coated 40 having a small production amount, the masking auxiliary body 32 is not formed using a mold, but is formed as a film-shaped auxiliary body 32 as in the second embodiment. If the necessary opening 32a is formed (for example, cut out) in accordance with the shape of the application portion 41 of the object 40, it is necessary to make a mold or the like in order to manufacture the masking auxiliary body 32. And cost can be reduced.

  As described in the first embodiment, depending on the state of the application portion 41 and the non-application portion 42 of the article 40, the masking auxiliary body 32 is attached to the outer peripheral edge 31b (see FIG. 7) outside the masking main body 31. The masking auxiliary body 32 may be provided in a tape-like shape in such a case since the masking auxiliary body 32 may have a tape-like shape, which is more convenient to use.

  On the other hand, in the second embodiment, the masking auxiliary body 32 is detachably attached to both the masking main body 31 and the article 40 so that the masking auxiliary body 32 passes between the masking body 31 and the article 40. Although specific examples have been given for the case, for example, the masking assisting body 32 is detachably attached only to the object to be coated 40, and the non-application portion 42 is separated from the boundary 43 so as not to cover the application portion 41. The masking main body 31 may be provided so as to overlap the masking main body 31 on the masking auxiliary body 32 on the side, and the masking main body 31 covers the non-coating portion 42 that is not covered by the masking auxiliary body 32.

  Then, the masking jig 30 described in detail in the first and second embodiments, that is, a masking auxiliary body 32 that defines a boundary 43 between the application part 41 and the non-application part 42 of the object 40, and a boundary A masking jig 30 which is disposed closer to the non-coating portion 42 than 43 and is provided so as to cover at least the non-coating portion 42 of the coating target 40 which is not covered by the masking auxiliary body 32; The liquid spraying unit 20 and the liquid spraying unit 20 are applied so that the liquid is applied to the application unit 41 that applies the liquid of the object 40 while covering the non-application unit 42 where the liquid of the object 40 is not applied. The liquid spray unit 20 is charged in a charged state by the electrostatic force generated by applying a voltage by a voltage application unit (voltage power supply) 50 to a different polarity part (in the above-described embodiment, an object to be coated) 40 that becomes a different polarity. From the coating According to the electrostatic spraying method in which electrostatic spraying is performed by the electrostatic spraying device that sprays the atomized liquid onto the coating material 40, the application unit 41 that applies the liquid to the object 40 and the non-application unit 42 that does not apply the liquid Can be formed with high accuracy, and the thickness of the liquid applied near the boundary 43 of the application section 41 can be suppressed from increasing.

As described above, the present invention has been described based on the specific embodiments. However, the present invention is not limited to the above embodiments, and may be appropriately modified or improved.
For example, an additional different polarity part that promotes the liquid to be released in a charged state may be provided in the vicinity of the liquid nozzle 22 of the liquid spray unit 20.

  As described above, the present invention is not limited to the specific embodiments, but includes appropriately modified or improved ones included in the technical scope of the present invention. Is apparent from the description of the claims.

10 Electrostatic Spraying Device 20 Liquid Spraying Unit 21 Body 21a Liquid Supply Port 21b Liquid Flow Path 21c Hole 21d Rear End Opening 21e Female Screw Structure 22 Liquid Nozzle 22a Tip Outer Peripheral Edge 22b Opening 23 Mandrel 23a Knob 23b Electrical Wiring Connection portion 23c Male screw structure 23d Tip surface 24 Sealing member 30 Masking jig 31 Masking body 31a Opening 31b Outer edge 32 Masking auxiliary body 32a Opening 35 Peripheral edge 40 Different polarity part (substrate)
41 coating part 42 non-coating part 43 boundary 50 voltage applying means 60 grounding means 80 tailor cone

Claims (8)

The liquid is separated from the liquid spraying section in a charged state by an electrostatic force generated by applying a voltage between the liquid spraying section and a different pole section having a different polarity with respect to the liquid spraying section, and mist is applied to the object to be coated. Masking jig for use in an electrostatic spraying device for spraying an oxidizing liquid,
The masking jig includes a masking auxiliary body and a separate masking body,
The masking auxiliary body is disposed so as to be in contact with the object to be coated, so as to define a boundary between an application unit that applies the liquid of the object to be applied and a non-application unit that does not apply the liquid of the object to be coated. ,
The masking main body is disposed so as to cover the non-coating portion of the object to be coated which is not covered by at least the masking auxiliary body on the non-coating portion side than the boundary,
The masking body is formed using an insulating material so as to be in a charged state for repelling the liquid,
The masking auxiliary is in a state where it can be regarded as a part of the object to be coated in terms of potential, and a conductive material or 10 ¹⁰ Ω is applied so that the liquid can be applied to the object to be coated and the masking auxiliary. A masking jig made of an antistatic material having the following surface resistance.   The masking jig according to claim 1, wherein the masking auxiliary body can be detachably attached to the masking body.   The masking jig according to claim 1, wherein the masking auxiliary body can be detachably attached to the object to be coated. The liquid is separated from the liquid spraying section in a charged state by an electrostatic force generated by applying a voltage between the liquid spraying section and a different pole section having a different polarity with respect to the liquid spraying section, and mist is applied to the object to be coated. Masking jig for use in an electrostatic spraying device for spraying an oxidizing liquid,
The masking jig includes a masking auxiliary body and a masking body,
The masking auxiliary body is disposed so as to be in contact with the object to be coated, so as to define a boundary between an application unit that applies the liquid of the object to be applied and a non-application unit that does not apply the liquid of the object to be coated. ,
The masking main body is provided integrally with the masking auxiliary body so as not to be detachable on the non-coating part side from the boundary, and is disposed so as to cover at least the non-coating part of the object not covered by the masking auxiliary body. And
The masking body is formed using an insulating material so as to be in a charged state for repelling the liquid,
The masking auxiliary is in a state where it can be regarded as a part of the object to be coated in terms of potential, and a conductive material or 10 ¹⁰ Ω is applied so that the liquid can be applied to the object to be coated and the masking auxiliary. A masking jig made of an antistatic material having the following surface resistance.   The masking jig according to any one of claims 1 to 4, wherein the masking body has a thickness equal to or greater than a predetermined thickness so as to be in a charged state for repelling the liquid.   The masking jig according to claim 5, wherein the predetermined thickness of the masking body is 0.5 mm or more.   An electrostatic spraying device comprising the masking jig according to any one of claims 1 to 6. The liquid is separated from the liquid spraying section in a charged state by an electrostatic force generated by applying a voltage between the liquid spraying section and a different pole section having a different polarity with respect to the liquid spraying section, and mist is applied to the object to be coated. Using an electrostatic spraying device that sprays a oxidizing liquid, the liquid is applied to an application unit that applies the liquid of the object to be coated while a non-application portion of the object to be applied that is not applied is covered with a masking jig. An electrostatic spraying method for applying
The masking jig is
A masking auxiliary formed of a conductive material or an antistatic material having a surface resistance of 10 ¹⁰ Ω or less;
A masking body formed of an insulating material,
A step of applying the liquid to the application unit,
The masking auxiliary body is disposed so as to contact the object to be coated, so as to define a boundary between the application section and the non-application section, and the masking body is at least closer to the non-application section than the boundary. A step of disposing the masking jig so as to cover the uncoated portion of the object to be coated that is not covered by the masking auxiliary,
The masking main body is set to a charged state for repelling the charged liquid, and the masking auxiliary body is set to a state in which the masking auxiliary body can be regarded as a part of the coating object in terms of potential. To a charged state in which the toner can be applied.

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