JP2000354795A - Rotary coating device for spot pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a modulated spot pattern by attaching coaxially a minor diameter part of a rotary body having the minor diameter part at one end of an outer circumference and a major diameter part at another end part to a rotary shaft and arranging one or more discharge holes for supplying a coating material in the vicinity of the minor diameter part to make it possible to apply the coating material without diluting. SOLUTION: A rotary body 3 is attached coaxially to the tip of a rotary shaft 1 and the minor diameter part 4 of the rotary body 3 is attached to the rotary shaft 1. The discharge holes 7 of a pipe 6 for feeding a coating material 8 are arranged from the minor diameter part 4 toward the major diameter part 5 in the vicinity of the minor diameter part 4 of the rotary body 3 and the coating material 8 from a supply device is ejected in the vicinity of the minor diameter part 4 of the rotary body 3. The discharged coating material 8 flows on the conical surface 9 of the rotary body 3 from the minor diameter part 4 toward the major diameter part 5 by the gravity and the centrifugal force due to the rotation to form coating material drops 11 at the end part 10 of the major diameter part. Further, compressed air 13a is supplied to be jetted as air stream 13 from an air nozzle 12 mounted circularly around the minor diameter part 4 of the rotary body 3 toward the vicinity of the end part 10 of the major diameter part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[OOO1]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary coating apparatus for applying a spot pattern to a building board or the like used for a building in a factory.

[OOO2]

2. Description of the Related Art Conventionally, as a means for applying a spot pattern to a building, a method of spraying a high-viscosity paint with compressed air has been mainly used. Spraying has increased. However, the method of applying a spot pattern using compressed air in factory production has a problem that it is difficult to obtain a uniform spot pattern or a sharp spot pattern with a large variation in the particle size of the applied spot pattern. Was. Therefore, there is a need for a method of applying a spot pattern suitable for factory production. By applying the technology of a conventional rotating cup type electrostatic coating machine, a paint is supplied to the inner periphery of a rotating tapered cylindrical body. A method has been used in which a paint is ejected and applied by centrifugal force. However, this method can reduce the variation in the particle size of the spot pattern,
Furthermore, when trying to apply the undiluted solution of the coating material without diluting it to add sharpness to the speckled pattern to give a sharpness, the problem was that it could not be applied because the viscosity was high and it could not be discharged from the inner circumference of the tapered cylindrical body Had a point. The inner circumference of the tapered cylindrical body has ribs for connecting the shaft and the tapered cylindrical body, and the tapered cylindrical body has a discharge hole for the coating material, which complicates the flow path of the coating material. Therefore, the cleaning is not easy, the consumption of the cleaning liquid is increased, and at the same time, the cleaning time is prolonged.

[OOO3] FIG. 3 is a cross-sectional view of a conventional spin coating apparatus for applying a spot pattern. The rotating shaft 51 is rotated by a driving source 52 such as an air motor or an electric motor.
A tapered cylindrical body 53 is coaxially attached to the tip of the rotating shaft 51 by a rib 54, and a hole 55 is formed in the rib 54 to allow a coating material 56a supplied from above to pass therethrough. A discharge hole 57 of a supply pipe 56 for the coating material is provided in the upper cylindrical interior 53a of the cylindrical body 53, and when the coating material 56a is discharged from a supply device (not shown),
The discharged coating material 56a flows on the upper surface 54a of the rib 54 by centrifugal force and gravity due to rotation, flows out from the hole 55 to the inner periphery 53c of the lower cylindrical interior 53b, and is further coated at the cylindrical end 53d by centrifugal force and gravity. It becomes the material grain 58. Although not shown, a compressed air flow is sent to the cylindrical end portion 53d and the coating material particles 58 to adjust the strength of the air flow or change the direction of the ejection to thereby form the cylindrical end portion 53d.
It is possible to adjust the particle diameter of the coating material particles 58 and the pattern in which the coating material particles 58 spread at d. However, since the flow path of the coating material is complicated due to the structure in which the ribs 54 have the holes 55 through which the coating material passes, it is not possible to discharge a sufficient amount of the undiluted solution of the coating material, and at the same time, the cleaning is not easy and the consumption of the cleaning liquid is low. However, the cleaning time was prolonged and the working efficiency was poor. Also, if the diameter of the hole 55 is increased in order to increase the supply amount of the coating material 56a, the hole 5
5 has a problem that the coating material particles 48a fall directly from the coating material 5.

[OOO4]

SUMMARY OF THE INVENTION According to the present invention, when a coating material for building panels or the like is supplied to a rotating body to apply a spotted pattern, a stock solution of the coating material is applied in an attempt to add a more uneven feeling and sharpen it. Even if application is attempted without dilution, a sufficient discharge amount cannot be obtained because the flow path of the application material is complicated.
Another object is to solve the problem that cleaning is not easy and the consumption of the cleaning liquid increases, and at the same time, the cleaning time increases, resulting in poor working efficiency.

[OOO5]

According to a first aspect of the present invention, a small diameter portion of a rotating body having a small diameter portion at one end of an outer periphery and a large diameter portion at the other end is mounted coaxially with a rotating shaft, and the vicinity of the small diameter portion is provided. One or a plurality of discharge holes for supplying the coating material were provided. Second
In the invention, the rotation speed of the rotating shaft is 3000 rotations / minute or less. In the third invention, a plurality of application materials are supplied to the plurality of discharge holes. In the fourth invention, a cylindrical edge is formed in the large-diameter portion of the rotating body toward the small-diameter portion, and a discharge hole is formed in the cylindrical edge. According to a fifth aspect of the present invention, the intermediate portion between the small diameter portion and the large diameter portion of the rotating body has a substantially conical shape, and in the sixth aspect, the rotating body has a disk shape.

[OOO6]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a detailed view of an embodiment of the present invention, in which a rotating shaft 1 is rotated at 300 to 3000 revolutions / minute by a driving source 2 such as an air motor or an electric motor. A rotating body 3 having a substantially truncated cone shape is coaxially attached to the tip of the rotating shaft 1, and the small diameter portion 4 of the rotating body 3 is attached to the rotating shaft 1.
Attached to. A discharge hole 7 of a supply pipe 6 for the coating material is provided near the small diameter portion 4 of the rotating body 3 from the small diameter portion 4 to the large diameter portion 5. Discharge near the small diameter portion 4. The discharged coating material 8 flows on the conical surface 9 of the rotating body 3 from the small-diameter portion 4 toward the large-diameter portion 5 due to gravity and centrifugal force due to rotation, and becomes a coating material particle 11 at a large-diameter portion end 10. further,
A compressed air 13a is supplied from an air source (not shown), and is ejected from an air nozzle 12 which is circumferentially provided around the small diameter portion 4 of the rotating body 3 as an air flow 13 toward the vicinity of the large diameter portion end portion 10. Let me. As a result, by adjusting the strength of the air flow 13 or changing the direction of the jet, the large-diameter end 1
It is possible to adjust the particle diameter and spread pattern of the coating material particles 11 at 0.

[OO07] The number of supply pipes 6 may be 1 depending on the increase in the supply amount of the coating material and the degree of occurrence of pattern unevenness of the coating material particles 11.
It may be installed by increasing the number from a plurality to a plurality. Further, by supplying a plurality of kinds of coating materials to the plurality of supply pipes 6, it is also possible to apply a multicolored or multi-liquid curable coating material. Further, the conical surface 9 and the large-diameter end portion 10 of the rotating body 3 can be easily cleaned by flowing the cleaning liquid into the supply pipe 6 or installing a dedicated cleaning liquid supply pipe 14. Since the cleaning section has a simple shape different from the conventional example, cleaning can be performed easily and in a short time.

FIG. 2 is a detailed view of another embodiment of the present invention, in which a large-diameter portion 5a of a rotating body 3a having a substantially frustoconical shape is formed with a cylindrical edge 15a toward a small-diameter portion. Fifteen
A discharge hole 15b is formed in a. As a result, the cylindrical edge 1
The application material 8 dammed to 5a passes through the discharge hole 15b.
It is released as more uniform and large coating material particles 15c.
The diameters of the coating material particles 11 and the coating material particles 15c can be changed by changing the angle of the substantially truncated cone and the hole diameter of the discharge hole 15b in the embodiment of FIGS. Further, it is also possible to form the large-diameter pattern by making the rotating body 3 into a disk shape.

[OO09]

As described above, in the spot-type rotary coating apparatus according to the present invention, the coating material discharged from the discharge hole of the supply pipe simply moves the outer peripheral portion of the rotating body from the small diameter portion to the large diameter portion. Therefore, the coating solution can be applied without diluting the undiluted solution of the coating material, and a speckled pattern with a more uneven feeling can be obtained. Further, the cleaning can be easily performed, and the effect of reducing the consumption of the cleaning liquid and shortening the cleaning time can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional configuration view of an embodiment of the present invention.

FIG. 2 is a sectional configuration view of another embodiment of the present invention.

FIG. 3 is a cross-sectional configuration diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating shaft 3 Rotating body 4 Small diameter part 5 Large diameter part 7 Discharge hole 15a Cylindrical edge 15b Discharge hole

Claims (6)

[Claims] A small diameter portion of a rotating body having a small diameter portion at one end of the outer circumference and a large diameter portion at the other end is coaxially mounted on a rotation shaft, and a discharge hole for supplying a coating material is provided near the small diameter portion. A rotary coating device having a spot pattern, wherein one or a plurality of the coating devices are arranged. 2. The spot type rotary coating apparatus according to claim 1, wherein the number of rotations of said rotary shaft is not more than 3000 rotations / minute. 3. The spot type rotary coating apparatus according to claim 1, wherein a plurality of coating materials are supplied to said plurality of discharge holes. 4. A rotation of a spot pattern according to claim 1, wherein a cylindrical edge is formed in a large diameter portion of said rotating body in a direction toward a small diameter portion, and a discharge hole is formed in said cylindrical edge. Type coating device. 5. The rotating body according to claim 1, wherein an intermediate portion between the small diameter portion and the large diameter portion is substantially conical.
Rotary coating device with spotted pattern. 6. The spot-type rotary coating apparatus according to claim 1, wherein said rotary body has a disk shape.