JP4906639B2 - Coating method and coating apparatus - Google Patents

Description

  The present invention relates to a coating method and a coating apparatus, and more particularly to a coating method and a coating apparatus that apply a resin paint to a plate surface of a substrate.

  As a method of uniformly applying the paint, a bead of paint having a thickness of several hundreds μm to 2 mm is formed on the surface of the object, and the paint having a constant thickness of about several tens μm is formed by the wettability of the paint. And a method of regulating the thickness of the paint adhering to the surface of the object with a knife or blade that forms a certain gap between the object and the object.

  The method using the wettability of the paint is applied to the application of a paint having a relatively low viscosity. In order to form a stable bead, a roller immersed in the paint (see Patent Document 1) or an expensive such as a capillary tube is used. Equipment is required. Further, when such an apparatus is used, extra paint is required, and there is a problem that the paint is wasted when applied to a small number of objects. Further, when the coating speed is increased, the bead vibrates or the supply of the coating material to the bead becomes unstable, and the film pressure of the coating film varies.

In the method of regulating the thickness of the paint by means of a knife or blade, it is only necessary to supply a required amount of paint first, so that the paint can be applied with an inexpensive apparatus. However, in this case, since a wedge-shaped paint reservoir is formed between the object and the knife or blade, there is a problem that the larger the remaining amount of paint, the thicker the paint film due to the wedge film effect. Furthermore, this method is applied to the application of a relatively high-viscosity paint, and cannot be applied to a case where a low-viscosity paint is applied to a thickness of a micron.
Japanese Patent Laid-Open No. 5-138097 JP-A-5-76813

  In view of the above problems, it is an object of the present invention to provide a coating method and a coating apparatus that can apply a uniform paint without waste of the paint.

In order to solve the above-mentioned problem, a first aspect of the coating method according to the present invention is to hold a flat target plate surface of an object horizontally, and to apply the flat coating surface of a coating plate made of glass to the target plate surface. Are held in parallel so as to face each other at a predetermined interval, and a paint is injected between the target plate surface and the application surface, and a surface tension of the paint causes the target plate surface to be applied between the application surface. A continuous bead is formed, the object is moved relative to the application plate in a direction parallel to the object plate surface and the application surface, and the object plate surface is affected by wettability of the object to the paint. A method of attaching paint.

  According to this method, since the bead is formed by holding the paint between the application plate and the target plate surface by the surface tension of the paint, the target plate surface once holding the paint is moved to the target plate surface even after the application plate moves. A certain amount of paint is left due to the wettability of the paint. By holding the application surface and the target plate surface in parallel, the wedge film effect does not act on the paint, so that the paint remains on the target plate surface with a constant thickness regardless of the remaining amount of the paint. Also, by keeping the application surface and the target plate surface horizontal, gravity does not act in the direction of pushing the paint out of the bead, and the thickness of the paint remaining on the target plate surface even if the amount of the injected paint is not uniform Does not vary. In addition, since the bead of the paint is sufficiently large, the bead vibrates or becomes unstable, and the thickness of the paint remaining on the target plate surface does not fluctuate, and the paint is uniformly applied to the entire target plate surface at high speed. can do. Further, since only a minimum amount of paint that adheres to the target plate surface and the application surface is required due to wettability, there is no waste of paint. Furthermore, since it is not necessary to supply paint during application, an expensive apparatus is unnecessary.

Moreover, the 2nd aspect of the coating method by this invention hold | maintains the flat target board surface of a target object horizontally, and makes the flat application surface of an application board face the said target board surface by predetermined spacing. Holding in parallel, injecting paint between the target plate surface and the application surface, and forming a continuous bead between the target plate surface and the application surface by the surface tension of the paint, the target An application method in which an object is relatively moved with respect to the application plate in a direction parallel to the target plate surface and the application surface, and the paint adheres to the target plate surface by wettability of the object to the paint. In this method, a spacer having a uniform thickness is sandwiched between the object plate surface and the application surface, and the object or the application plate is moved along the spacer .

  According to this method, the target plate surface and the coating surface can be kept strictly at a constant distance.

In addition, the first aspect of the coating apparatus according to the present invention is a coating having a holding base for holding an object so that a target plate surface to which a paint is applied is horizontal, a flat coating surface, and made of glass. a plate, moving the a coating plate holding member coated surface for holding the coated plate so as to face at regular intervals to said subject plate surface, the holder or the coating plate holding member in parallel with the target plate surface A drive mechanism for injecting paint between the target plate surface and the application surface, and forming a continuous bead between the target plate surface and the application surface by surface tension of the paint, When the drive mechanism moves the holding base or the application plate holding member, the paint is attached to the target plate surface by the wettability of the target with respect to the paint .

  According to this configuration, the coating material is held between the coating plate and the target plate surface by the surface tension of the coating material, and the coating plate is passed on the target plate surface after the coating plate has passed by the relative movement between the coating plate and the holding table. A certain amount of paint can be adhered by wettability.

  In addition, the second aspect of the coating apparatus according to the present invention includes a holding table that can move horizontally by holding an object such that the target plate surface to which the coating material is applied is horizontal, and a uniform thickness on the target plate surface. An application plate having a flat application surface placed via a spacer and an application plate fixed to both sides of the holding table, abutting on the application plate, and capable of regulating movement of the application plate accompanying the holding table A plate holding member is provided.

  According to this configuration, the holding plate is moved horizontally while pressing down the application plate, so that the target plate surface and the application surface are moved relative to each other while being in parallel, and injected between the target plate surface and the application surface. The applied paint can be uniformly applied to the target plate surface by wettability.

  According to the present invention, the wedge film is formed by holding the coating material between the coating plate and the target plate surface by the surface tension of the coating material, and moving the target plate surface and the coating plate in parallel while being kept parallel. The paint can be uniformly applied to the target plate surface by wettability.

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 shows a coating apparatus 1 according to one embodiment of the present invention. The coating apparatus 1 is an apparatus that applies a resin (paint) to a flat target plate surface of a glass substrate (target object) 2.

  In the coating apparatus 1, a holding table 4 on which a glass substrate 2 is placed is provided on a frame 3 so as to be horizontally movable. On both sides of the holding table 4, an application plate holding member 5 fixed to the frame 3 stands upright. Is provided.

  The holding table 3 is a surface plate on which the glass substrate 2 is horizontally placed with the target plate surface facing upward, and the belt 6 connected to one end is wound up by a pulley 8 driven by a motor 7, thereby guiding the guide 9. (Drive mechanism).

  In the coating device 1, for example, two wires 10 having a wire diameter of 200 μm are arranged as spacers having a uniform thickness on both sides in the moving direction of the holding table 4 on the target plate surface of the glass substrate 2 placed on the holding table 4. The coating plate 11 is disposed so that both ends thereof are in contact with the upstream side in the moving direction of the holding table 4 of the coating plate holding member 5 so as to be placed on the wire 10.

  The coating plate 11 is made of, for example, a strip-shaped glass plate 12 having a thickness of 3 mm, and a back plate 13 is attached to the back surface to prevent deformation of a flat coating surface facing the target plate surface of the glass substrate 2. It is.

  As shown in FIG. 2, the target plate surface of the glass substrate 2 and the coating surface of the coating plate 11 are held parallel to each other with the wire 10 sandwiched therebetween, as shown in FIG. In between, resin is inject | poured from the moving direction downstream of the holding stand 4. FIG. At this time, as shown in FIG. 3, the resin R is uniformly injected over the entire width of the glass substrate 2 where the resin R is to be applied.

  At this time, as shown in FIG. 4, the resin R adheres to the target plate surface of the glass substrate 2 and the coating surface of the coating plate 11 due to its wettability, and the glass substrate 2 and the coating plate 11 due to its surface tension. A continuous layer (bead) is formed at the full height of the gap.

  Subsequently, while holding the coating plate 11 by hand, the motor 7 is driven to move the holding table 4. The movement of the application plate 11 is regulated by the application plate holding member 5 and slides on the wire 10. That is, the coating plate 11 moves relative to the glass substrate 2 along the wire 10 in parallel to the target plate surface.

  At this time, the surface tension of the resin R acts to reduce the surface area, but the adhesion (wetting property) of the resin R to the glass substrate 2 and the coating plate 11 is the interface between the glass substrate 2 and the coating plate 11. The resin R in the vicinity is moved along with the glass substrate 2 and the coating plate 11, respectively, and the layer of the resin R is to be sheared. As a result, as shown in FIG. 5, the resin R having a certain thickness with which the wettability is superior to the surface tension adheres to the target plate surface of the glass substrate 2 drawn out from the coating plate 11.

  Thus, as shown in FIG. 6, the resin R is applied to the target plate surface of the glass substrate 2 with the width in which the resin R is first injected into the gap between the glass substrate 2 and the application plate 11. At this time, since the target plate surface is parallel to the application surface, the wedge film effect does not occur in the resin R, and since the target plate surface is held horizontally, the gravity acting on the resin R is not affected by the resin. R does not act in the direction of pushing out the gap between the glass substrate 2 and the coating plate 11. For this reason, since the thickness of the resin R to be applied is determined only by the balance between wettability and surface tension, it is not affected by the amount of the resin R remaining in the gap between the glass substrate 2 and the application plate 11.

  As shown in FIG. 7, when the holding table 4 moves to the most downstream side, as shown in FIG. 8, the resin R is uniformly applied to the entire desired range of the target plate surface of the glass substrate 2. At this time, as shown in FIG. 9, when the resin R layer applied to the target plate surface of the glass substrate 2 and the resin R layer remaining on the application surface of the application plate 11 are subtracted, It is necessary to determine the amount of the resin R to be injected first so that a continuous layer of the resin R remains between the glass substrate 2 and the coating plate 11.

  In the coating apparatus 1, only a very small amount of the resin R, that is, the resin R adhering to the coating plate 11 and the resin R remaining between the glass substrate 2 and the coating plate 11 is wasted.

  Further, in the coating apparatus 1, since a large bead is formed by the total amount of the resin R applied first, the bead does not become unstable even if the moving speed of the holding table 4 is high, and the coating performance is stable. .

  In the above embodiment, the glass substrate 2 and the coating plate 11 are arranged in parallel by sandwiching the wire 10, but a spacer for defining a gap between the coating substrate 11 and the glass substrate 2 is provided. You may keep it. Further, the application plate 11 may be fixed in parallel with the glass substrate 2 by the application plate holding member 5.

  Moreover, in the said embodiment, although the holding stand 4 is moved by the motor 7, even if the application board 11 is manually moved on the glass substrate 2, resin R can be apply | coated. However, when the moving speed of the coating plate 11 changes or the angle of the coating plate 11 changes, such changes act on the beads of the resin R, and problems such as variations in the thickness of the coating film tend to occur. Therefore, it is preferable that the glass substrate 2 can be moved at a constant speed without changing the inclination of the coating plate 11 as in the above embodiment.

  Further, when the coating plate 11 is tilted with respect to the moving direction of the glass substrate 2, the resin R bead moves toward the side where the edge of the coating plate 11 is located downstream in the moving direction of the glass substrate 2. Therefore, it is preferable to hold the edge of the coating plate 11 at right angles to the moving direction of the glass substrate 2 as in the above embodiment. However, when the object to which the resin is applied is long, the application plate can be intentionally inclined to replenish the resin between the application plate and the object from the upstream side in the moving direction of the object.

  Further, in the coating method of the present invention, for example, the target object may be arranged with the target plate surface facing downward, or the target plate may be fixed and the coating plate may be moved.

  The present invention is particularly useful when a precious resin is applied on a trial basis, such as in trial production of an electrical component.

The perspective view of the coating device of one embodiment of this invention. The side view of the coating device of FIG. The top view of the coating device of FIG. The side view of the glass substrate and coating plate in the coating device of FIG. The side view in the middle of application | coating with the glass substrate and coating plate in the coating device of FIG. The top view in the middle of application | coating of the coating device of FIG. The side view at the time of completion | finish of application | coating of the coating device of FIG. The top view at the time of completion | finish of application | coating of the coating device of FIG. The side view at the time of completion | finish of application | coating with the glass substrate and coating plate in the coating device of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coating device 2 Glass substrate 3 Frame 4 Holding stand 5 Coating plate holding member 6 Belt 7 Motor 8 Pulley 9 Guide 10 Wire (spacer)
11 Coating plate 12 Glass plate 13 Back plate R Resin (paint)

Claims (4)

Hold the flat target plate surface of the object horizontally,
Holding the flat coating surface of the coating plate made of glass parallel to the target plate surface at a predetermined interval,
Injecting paint between the target plate surface and the application surface, forming a continuous bead between the target plate surface and the application surface by the surface tension of the paint,
The object is moved relative to the application plate in a direction parallel to the object plate surface and the application surface, and the paint is attached to the object plate surface by wettability of the object to the paint. Application method. Hold the flat target plate surface of the object horizontally,
Holding the flat coating surface of the coating plate parallel to the target plate surface at a predetermined interval,
Injecting paint between the target plate surface and the application surface, forming a continuous bead between the target plate surface and the application surface by the surface tension of the paint,
An application method in which the object is moved relative to the application plate in a direction parallel to the object plate surface and the application surface, and the paint adheres to the object plate surface by wettability of the object to the paint. There,
A spacer having a uniform thickness is sandwiched between the target plate surface and the application surface,
A coating method, wherein the object or the coating plate is moved along the spacer . A holding table for holding the object so that the target plate surface to which the paint is applied is horizontal;
A coating plate having a flat coating surface and made of glass;
A coating plate holding member, wherein the coated surface for holding the coated plate so as to face at regular intervals to said subject plate surface,
A drive mechanism for moving the holding table or the coating plate holding member in parallel with the target plate surface ;
Injecting paint between the target plate surface and the application surface, forming a continuous bead between the target plate surface and the application surface by the surface tension of the paint,
The coating apparatus, wherein the driving mechanism moves the holding base or the coating plate holding member to attach the coating material to the target plate surface by wettability of the target material with respect to the coating material. A holding stand that can move horizontally by holding the object so that the target plate surface to which the paint is applied is horizontal;
A coating plate having a flat coating surface placed on the target plate surface via a spacer having a uniform thickness;
An application apparatus comprising: an application plate holding member fixed to both sides of the holding table, abutting the application plate, and capable of restricting movement of the application plate accompanying the holding table.

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