JPS62183874A - Coating control apparatus - Google Patents

Abstract

PURPOSE:To obtain a painted article having a uniform thickness, by removing excessive paint by the sucking stream at the take-out port of a painting body by reducing the pressure in a painting box. CONSTITUTION:A base material is supplied to the direction shown by an arrow A from a supply port 11 and passes through a painting box 10 to be taken out to the direction by an arrow B from a take-out port 12. Air is sucked inside the take-out port 12 and the supply port 11 by a pressure reducing means and paint is not flooded from both ports. The base material is immersed in the paint in the painting box 10 and the paint is applied to the entire surface of the base material. The excessive paint is removed at the take-out port 12 by a sucking air stream to obtain a uniform film thickness. The painted article issued from the take-out port 12 is subsequently dried to a dryness to the touch degree. The base material may be supported by a guide means 70.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for applying paint to the surface of a base material such as a board or rod, by applying the paint to the entire surface of the base material or only to a desired surface. The thickness of the coating film is 1! The present invention relates to a coating adjustment device.

Conventional technology Various methods have been used to paint base materials such as board materials (e.g. decorative board 1 baseboard), bar materials (e.g. surrounding edges, beaded edges), processed materials (e.g. window frames, doors), etc. There is.

One such device is a dipping coating device. Dipping coating equipment can be used even if the surface of the base material is uneven.
It has the advantage that painting can be done with simple operations.

Spray coating equipment is also suitable for coating textured substrates.

Problems to be Solved by the Invention However, dipping coating equipment generally
There is a tendency for the amount to increase, and it is difficult to adjust the amount of application.

This is because although the amount of coating is strongly correlated with the viscosity of the paint, it is difficult to maintain the viscosity of the paint strictly constant. The viscosity of the paint also affects the penetration of the paint components into the base material, and in order to achieve uniform coating, the viscosity of the paint must be increased to a certain extent and the paint must be applied thickly. After taking out the substrate, it is necessary to support the substrate for a while in order to allow excess paint to flow down from the substrate, but this operation takes extra time and also causes uneven coating due to peeling or sagging of the paint. Part 1: Furthermore, it is difficult to apply coating only to the desired surface of the base material.

Spray painting equipment has a lot of paint loss, and the nozzle is easily clogged due to dust and paint scum in the paint.
Furthermore, if the shape of the base material is complex, multiple nozzles must be used. Therefore, it is necessary to frequently perform coating t+ management and maintenance and inspection of the nozzle, resulting in poor efficiency and high costs.

It is therefore an object of the present invention to provide a simple coating device that removes excess paint while retaining the advantages of a dipping device.

Another object of the present invention is to provide a simple coating device that applies coating only to a desired surface of a substrate.

A further object of the present invention is to provide a coating apparatus that efficiently coats substrates of various shapes.

Means for Solving the Problems According to the apparatus of the present invention, there is provided a coating box having at least one pair of a supply port for supplying a substrate to be coated and a discharge port for taking out a coated product; and a paint supply means for supplying paint to the paint box beyond the level of the take-out port, and a decompression means for reducing the pressure inside the paint box to prevent paint from flowing out by suctioning air from the supply port and the take-out port. and has. Paint is applied to the desired surface of the substrate during its movement from the supply port to the discharge port, and excess paint is removed by an air flow at the discharge port created by suction.

By providing suitable auxiliary means between the inlet and the outlet, it is also possible to apply the coating only to selected surfaces or selected areas of one surface of the substrate.

In the present invention, even if the paint is supplied beyond the level of the supply port and outlet of the paint box, the pressure is reduced by suction.
Since air is sucked in from these openings at high speed, the paint will not flow out, and even if the surface of the substrate is uneven, the paint can be easily applied in the paint box just like the dipping method. At the outlet, excess paint can be removed by a stream of air and the product removed from the outlet can be dried to touch.

The amount of coating can be adjusted by adjusting the viscosity of the paint, adjusting the negative pressure inside the coating box, and adjusting the conveyance speed of the substrate.
The most desirable method is to keep the viscosity of the paint and the pressure of the pressure reducing means constant, and adjust the pressure by adjusting the amount of air taken in from the secondary air intake. This method allows fine adjustment of the coating amount.

Furthermore, by adjusting the relationship between the dimensions and shapes of the supply and outlet ports and the cross-sectional dimensions of the base material, it is possible to adjust the speed of the air flow at the outlet, thereby increasing the thickness of the coating film.
In addition, by appropriately adjusting the positional relationship between these openings and the substrate, different coating film thicknesses can be provided on the surface of the substrate.

Furthermore, by providing suitable auxiliary means between the supply port and the discharge port, it is also possible to apply coating only to a portion of the surface of the substrate.

EXAMPLES Although the main points of the present invention have been described above, the present invention will be explained in further detail below through preferred examples of the present invention.

FIG. 1 is a schematic sectional view of an apparatus according to a preferred embodiment of the present invention, and FIG. 2 is a schematic sectional view taken along line 2--2 in FIG. Application 1! l'l! The E device includes a paint box 10, a paint supply means 20, and a pressure reduction means 50.

The coating box 10 has a supply port 11 for supplying a base material to be coated (not shown) and an outlet 1 for taking out the coated base material.
It has one pair with 2. In the illustrated embodiment, these openings 11.1 may be provided with a plurality of pairs of supply ports and outlet ports.
The opening area of No. 2 has the maximum size and shape that can accept the base material with the planned maximum cross-sectional size and shape, and an opening with a smaller size and shape is used to accommodate the size and shape of the opening. Adjustment plate member 11' is shown as having an angle of 12°. The 17i1dayfQfl plate member is removably mounted in the paint box by suitable fastening means (not shown). A lid 13 is provided on the top surface of the paint box and is removable for internal cleaning, maintenance and inspection. The lid has suitable attachment means (not shown) to provide an airtight seal.

It is also possible to provide a plurality of pairs of supply ports and outlet ports. The plurality of pairs of openings may be arranged in parallel or intersectingly.

In this embodiment, the paint supply means 20 is arranged directly below the paint box, and includes a paint tank 21, a pipe 22 for supplying paint from the paint tank to the paint box, and a paint supply pump 23. The paint may be supplied by suction by negative pressure in the paint box.

In this embodiment, a communication means 30 is provided that allows fluid to flow between the upper part of the paint box 10 and the upper part of the paint supply means 20. The communication means 30 is provided by a pair of partition walls 31 provided on both sides of the substrate conveyance path in the coating box 10.
Gap 3 connecting the top of the paint box and the top of the paint tank
It is formed as 2. It is better for the cross-sectional area of the communication means to be large to some extent. This is because if the cross-sectional bond is small, clogging is likely to occur due to adhesion of paint.

Further, this embodiment is shown as having a paint extraction means 40 for extracting the paint from the paint box 10.

The paint removing means is normally closed and has a valve 41 that is opened when removing paint. Although not shown in the figure, it is desirable to provide a pressure detection means in the painting box so that when the pressure inside the painting box exceeds a predetermined pressure, the valve 41 is automatically opened. Various types of automatic valves themselves are known and therefore will not be described in detail.

The pressure reducing means 50 is shown in this embodiment as being connected to the paint cofeeding means 20.

The pressure reducing means may be a vacuum pump 51 and a notepad 52 that communicates the upper part of the paint tank 21 with the atmosphere.

The reduced pressure of the pressure reducing means is supplied to the supply port 11. When paint is supplied into the paint box above the level of the outlet 12, it must be sufficient to draw air through the openings to the extent that paint is prevented from spilling out of the openings. The value is determined by the viscosity of the paint used, the size and shape of the supply and outlet openings, the relationship between the level of the paint in the paint box and the level of the openings, etc. As mentioned above, the upper part of the paint box and the upper part of the paint tank are communicated with each other by the communication means 30, so that the inside of the paint box is
The pressure can be reduced by the pressure reducing means 50.

In this embodiment, gas-liquid separation means 60 are also provided. The gas-liquid separation means may be of various types, but in the illustrated embodiment is shown as a plurality of baffles 61 in the upper portion of the paint tank. Supply port 11 inside the paint box.
The air sucked through the outlet 12 becomes bubbles and rises in the paint, and droplets of paint are carried out into the air above the paint box. Air containing paint droplets is the communication means.

When the paint is exhausted to the atmosphere by the decompression means through the paint tank, it is guided toward the paint surface by the baffle plate 61, and the paint droplets are shaken off to the paint surface by gravity and/or centrifugal force. . Of course, other types of gas-liquid separation means are also applicable. Furthermore, if the paint contains a volatile solvent, a solvent recovery means can be added to the pressure reduction means. The solvent recovery means themselves are known and therefore will not be described in detail.

Having described the basic structure of the apparatus of the present invention above, the painting operation will be explained below.

A base material (not shown) is supplied from the supply port 11 in the direction of arrow A, passes through the coating box 10, and is taken out from the take-out port 12 in the direction of arrow B. Air is sucked inside the supply and outlet ports by means of a vacuum so that the paint does not spill out of these openings.

The sucked air forms bubbles that rise in the paint liquid and escape into the air above the paint box. When the substrate passes between the supply port 11 and the discharge port 12, the intermediate portion thereof is immersed in the paint, and the entire surface of the substrate is coated.

As the substrate approaches the outlet 12, the airflow sucked through the outlet 12 blows off the paint adhering to the surface of the substrate, removing excess paint. The base material exiting the outlet 12 is dried to the extent that it is dry to the touch. Conveying means for supply and withdrawal (not shown) in close proximity to the supply and discharge ports
can be provided.

If the substrate is shaken or lifted by the air flow sucked in from the supply and outlet ports and the stirring action of the paint liquid caused by the air flow, the substrate is guided and supported between these openings. Appropriate guiding means 70 may be provided to do so.

The guide means 70 may be a plurality of bar members that extend in the paint box and intersect with the transport direction of the base material, and are arranged so that the base material passes above or below these bar members. Alternatively, the buck members may be arranged in two rows so that the base material passes between them. Furthermore, the buck members may be provided with protrusions that limit the lateral movement of the base material. You can also do that. In this embodiment, two pairs of upper and lower bar members 71 are installed between opposing side walls of the paint box, and are provided with disk-shaped protrusions 72 that limit lateral rocking. It is preferable that the guide means be level adjustable and replaceable as appropriate depending on the cross-sectional dimensions and shape of the base material. This is not necessary when painting a long base material that is longer than the distance between the two.

In the basic configuration described above, the entire surface of the base material is coated. If only a limited surface of the substrate or a limited area of one surface is to be coated, auxiliary means are necessary.

Some embodiments of the auxiliary means will now be described with reference to FIG.

FIG. 3a is a perspective view of an embodiment of the auxiliary means for coating only the surface of the substrate, and FIG. 3a is a perspective view of the auxiliary means 80 along line E in FIG. It is a sectional view of base material S. The auxiliary means 80 has a cylindrical structure 81,
In this embodiment, a window 82 is provided on the upper surface of the intermediate portion in the axial direction.

The cylindrical structure of the auxiliary means is airtightly supported at both ends by openings of a supply port and a discharge port, respectively. At that time, window 82
It is preferable to place it at the top. When so arranged, when the paint box 10 is depressurized, air is drawn in from both ends of the cylindrical structure and exhausted through the window 82. This air flow prevents the paint from overflowing from both ends of the cylindrical structure. When the base material S is supplied into the cylindrical structure from the supply port side, the air intake area on the supply port side of the cylindrical structure is Narrowed by the base material, increasing the speed of the airflow. The substrate is guided within the cylindrical structure by this air flow. When the substrate is conveyed beyond the area of the window 82, the air stream is discharged at high velocity through the gap between the top and side end surfaces of the substrate and the inner surface of the tubular structure, depositing paint into the gap. There will be no intrusion.

The paint is agitated by the air exhausted from the window 82,
Prevents separation of paint components and sedimentation of solid components such as pigments. Furthermore, the area between the discharged air streams is filled with paint liquid, so that the paint contacts only the upper side of the substrate and thus only the upper side is coated S1. When the coated surface of the substrate enters the cylindrical structure on the side of the outlet, it encounters the air flow sucked in from the side of the outlet, whereby excess paint is blown off. When the coated base material is taken out from the outlet side end of the cylindrical structure, the coated surface of the base material is dry to the touch. The conveyance of the base material within the cylindrical structure 81 is guided along the lower surface by a high-speed air flow.
If necessary, guide protrusions 81a and 81b as shown in FIG. 3A (in FIG. 3A, for simplicity of drawing,
Guide protrusions (omitted) may be provided on the inner surface of the tubular structure to more accurately guide the substrate within the tubular structure.

FIG. 3 shows a modified example of the auxiliary means 80, in which a window 82 is provided over the top surface and both side surfaces of the cylindrical structure. It will be understood that by this auxiliary means, the upper surface of the base material S and the ends of both side edges are painted.As shown in FIG. and 81b, the gap Fl between the inner wall surface of the cylindrical structure and the surface of the base material can be adjusted as desired.

FIG. 3C shows yet another modification of the auxiliary means,
In this modification, two windows 82 are provided on the top surface of the cylindrical structure. As shown in Figure 3C, there are two
A striped coating of rows may be applied.

In the explanation of the auxiliary means explained above, the reason why the cylindrical window is placed at the top is that if the window is placed at the bottom, the air bubbles will rise upward, so
This is because when 1f of air bubbles adhere to the f1 surface, spotty unpainted portions may occur on the base material surface. However, the window can be placed on the underside by providing additional means to dislodge the air bubbles close to the underside of the substrate. Alternatively, a pair of rollers may be placed close to both ends of the window 81 in the axial direction so as to contact the lower surface of the substrate to remove air bubbles and guide the paint between the rollers. The advantage of this is that the roller has the effect of rubbing the paint onto the surface of the substrate, making it possible to perform sealing coating.

Furthermore, the guide protrusions 81a and 81b are not essential and may be provided as needed.Furthermore, by changing the dimensions and shape of the guide protrusions, the gap between the base material surface and the inner wall surface of the cylindrical structure can be intentionally increased. When spraying off excess paint,
It is also possible to change and adjust the coating thickness by varying the amount of blown-off.

3l: shows another way of using the auxiliary means of FIG. 3a. The base material S has two rows of ls2 on the upper surface, and therefore the sucked air has a high flow rate on both sides of the groove and on the mountain portion between them.

In this l), the paint is applied only in the grooves. or,
As shown in FIG. 3C, there are windows 8 in each area corresponding to the groove.
Even if 2 is provided, the same coating can be applied.

FIG. 4 is a perspective view of an additional auxiliary means 90 used in combination with the auxiliary means shown in FIG. 3, and is shown attached to the outside of the supply port 11 of the paint box 10. Additional auxiliary means 90 include a groove-shaped member 9 with an open upper part;
Paint supply ports 9 provided at the bottom of the groove close to both ends of the groove-shaped member
2 and a paint discharge port 93. The upper edge of the groove member 9 is positioned so as to come into contact with the lower surface of the base material,
When the substrate covers the top surface of the channel member, paint is adapted to be supplied by the pump. Both ends of the groove member are separated by the end walls m! The pump may be a discharge pump or a suction pump. When using a suction pump, when the base material covers the top surface of the groove member, the pressure inside the groove is reduced and the pump is automatically activated. Alternatively, the paint may be sucked in. Of course, the position of the substrate may be detected by a detection means such as a limit switch, and the paint may be supplied in response to the detection signal.In this way, in combination with the auxiliary means shown in FIG. 3, the position shown in FIG. When using additional auxiliary means,
The upper surface and/or both ends and a portion of the lower surface of the substrate can be coated. However, a similar coating can also be achieved by extending the window 82 of the auxiliary means shown in FIG. 3b to the lower side of the cylindrical structure. However, as described above, in this case care must be taken to prevent unpainted areas from forming on the lower surface of the substrate due to air bubbles.

In the above section 32, the base material has been described as having a generally rectangular cross section, but the cross section of the base material has a circumferential edge.

It will be appreciated that the substrate may have a fan-shaped cross-section, such as a bead, or a circular cross-section, such as a round bar, and the cross-sectional shape of the substrate need not be constant. However, if there is a change in the cross-sectional shape, the auxiliary means shown in FIG. 3C is not appropriate.

Furthermore, substrates whose cross-sectional shape changes drastically may not be coated as desired.

In order to prevent the paint from adhering to the baffle plate 61 shown in FIG. 1 and drying, and to wash it off, a solvent can be sprayed onto those surfaces.

Although some embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various changes can be made without departing from the technical idea of the present invention.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of the coating/A-setting device of the present invention, and FIG. 2 is a pattern-style front view of the device of FIG. 1 taken along line 2-2. Explanation of symbols 10: Paint box, 11: Supply port, 12: Outlet port, 13: Lid, 20: Paint supply means, 21: Paint tank, 22: Piping, 23: Pump, 30: Communication means, 31: Partition wall , 32
: Gap, 40: Coating f1 extraction means, 41: Valve, 50:
Depressurizing means, 51: Vacuum pump, 52: Piping, 60: Gas-liquid separation means, 61: Baffle plate, 70: Guide means, 7 Top member, 72: Protrusion, 80: TFI auxiliary means, 81: Cylindrical f
? i3m, 81a, 81b: Guide projection, 82: Window, 90
: Additional auxiliary means, 9]: Groove-shaped member, 92: Paint supply port, 93: Paint discharge port, engraving of drawing (no change in content) Fig, 4 Y port p jD ~ t (Procedural amendment book Showa May 8, 1961 1. Indication of the case 1985 Patent Application No. 25467 2] Name of the invention Coating adjustment device 3. Person making the amendment Relationship to the case Patent applicant's name or name Yasushi Hondatomi 4. Agent address: 3-11-5 Iidabashi, Chiyoda-ku, Tokyo 102 Showa 6
April 22, 1 year 6, Subject of amendment 1゛Brief explanation column for drawings''
(1) On page 22 of the specification, lines 15-16, "It is a front view in the form of a pattern." is corrected to "Schematic front view." (2) The following is inserted between lines 16 and 17 of the same page of the circular. "FIG. 3 is a diagram explaining embodiments of various auxiliary means used in the apparatus of the present invention, and FIG. 3 a, b,
c is a perspective view of each auxiliary means, Figure 3 A1B, C, and 2 are
FIG. 4 is a cross-sectional view showing the relationship between these auxiliary means and the base material. FIG. 4 is a perspective view of additional auxiliary means used in combination with the auxiliary means of FIG. (3) Correct the drawing as attached. Attached document:

Claims (1)

[Claims] [1] A coating box having at least one pair of a supply port for supplying a substrate to be coated and a take-out port for taking out a coated product; The present invention is characterized by comprising: a paint supply means for supplying the paint into the paint box over the paint box; and a pressure reduction means for reducing the pressure inside the paint box to prevent the paint from overflowing from the supply port and the take-out port. Coating adjustment device. [2] The coating adjustment device according to claim 1, wherein the paint supply means includes a paint tank, a pipe for supplying paint from the paint tank to the paint box, and a paint supply pump. Coating adjustment device. [3] In the coating adjustment device according to claim 1 or 2, the pressure reducing means is connected to the coating box, and separates paint liquid particles mixed into the air in the coating box from the air. A coating adjustment device characterized in that a gas-liquid separator for recovering gas is provided in the coating box and/or the pressure reducing means. [4] In the coating adjustment device according to claim 1 or 2, the upper portions of the paint box and the paint tank are communicated with each other by a communication means that allows fluid to flow, and the reduced pressure is A coating adjustment device characterized in that means is connected to a paint tank and reduces the pressure inside the paint box via the paint tank. [5] In the coating adjustment device according to any one of claims 1 to 4, a liquid level maintaining means for maintaining the liquid level of the paint constant in the coating box during normal operation. A coating adjustment device characterized by being provided with. [6] In the coating adjustment device according to any one of claims 1 to 5, the paint tank is disposed below the paint box,
A coating adjustment device characterized in that it is provided with a paint extraction means for extracting the paint in the paint box into the paint tank. [7] In the coating adjustment device according to claim 6, the coating box has a pressure detection means, and the paint extraction means automatically controls the coating when the pressure inside the coating box exceeds a predetermined value. A coating conditioning device characterized in that it has a valve means associated with said pressure sensing means for opening the valve to draw paint from the paint box. [8] The coating adjusting device according to claim 6 or 7, wherein the paint removing means has a pump and rapidly draws out the paint in the paint box. [9] In the coating adjustment device according to any one of claims 1 to 8, the opening size and shape of the supply port and the take-out port in the coating box are the maximum of the planned base material. What is claimed is: 1. A coating adjustment device having a size and shape that accepts the cross-sectional size and shape of the opening, and a mounting means for replaceably mounting an auxiliary aperture adjustment plate member for adjusting the size and shape of each opening. [10] Any one of claims 1 to 9
2. The coating adjustment device according to item 1, further comprising a guide means for guiding and supporting the substrate between the supply port and the take-out port of the coating box. [11] Any one of claims 1 to 9
In the coating adjustment device described in paragraph 1, a cylindrical auxiliary means is provided between the supply port and the take-out port for guiding and supporting the base material and having a window for exposing the surface of the base material to be coated. A coating adjustment device featuring: [12] Any one of claims 1 to 9
In the coating adjustment device described in paragraph 1, a groove-shaped member is provided on the outside of the supply port 11 of the paint box and is open upward so as to contact the lower surface of the base material, and paint is supplied to the lower surface close to both ends of the groove-shaped member. The paint supplying and discharging means is connected to the opening and the paint outlet, respectively, and supplies or discharges the paint, and the window of the auxiliary means applies the coating along the conveyance direction to the surface area of the substrate that is not to be coated. A coating adjustment device characterized by: [13] In the coating adjustment device according to any one of claims 11 to 12, a protrusion or ridge is provided on the inner surface of the cylindrical structure portion of the auxiliary means. A coating adjustment device characterized by adjusting the gap size between the side surface and the surface of the base material.