JPS6323770A - Method for partially coating base material - Google Patents

Abstract

PURPOSE:To uniformly and efficiently coat only a required part by decompressing the inside of a coating box and also feeding paint so that it exceeds the level of a coating port provided to the side wall and inducing paint to the required part of a base material which is brought into contact with the coating port under pressure and transferred. CONSTITUTION:Paint is fed so that it exceeds the level of a coating port 11 and on the other hand, the inside of a coating box 10 is decompressed by a decompressing means 30 and thereby outside air is sucked through the coating port 11 and paint is stored in the box 10 without being overflowed. In this state, in case of putting a base material on a guide plate 13 and bringing it into contact with the coating port 11 under pressure and transferring it, the suction of air is not performed and only the part exposed to the coating port 11 of the base material is coated by paint when the coating port 11 is completely closed by the part to be coated of the base material. Coated paint is scraped off in the edge part of a downstream side of the periphery of the coating port 11 and a coated thin film is formed. An easily-exchangeable adapter may be used in order to change the shape and the dimension of the coating port 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of painting a portion of a closure to be painted.

PRIOR TECHNOLOGY As a method for painting the end of a base material such as a decorative board, a floor board, a ceiling board, an actual finished or decorated end, or a part of the surface of the base material, for example, a method using a roll or a ring is used. Various methods are known, including spray applicator painting, spray painting, and shower coater painting.

Problems with the Prior Art In applicator coating, an applicator roll or applicator ring is brought into contact with the surface of the substrate to be coated, and the paint is transferred and applied via the roll or ring. Therefore, if the painted surface has irregular irregularities, a roll or ring with complementary irregularities is used. material base material,
When applying an applicator coating to a material that has been actually processed, the end of the end may be damaged by contact with rolls, rings, etc., and it is therefore difficult to adjust the contact pressure.

In spray painting, the coating f'10 is large, and the nozzle is easily clogged due to dust and paint scum in the paint, and maintenance and inspection of the nozzle must be performed frequently, which is inefficient and costly. Become.

Shower coater painting is a method in which paint is discharged from a discharge port and a portion of the surface of the substrate is coated while the substrate is moved close to the discharge port, but it is difficult to make the amount of paint uniform. Moreover, it is difficult to strictly limit the application area on a portion of one surface of the base material.

Means for Solving the Problems According to the present invention, in a coating box having a coating port on the side wall for coating a part of a base material, paint is supplied beyond the level of the coating port, while the coating box By reducing the pressure inside the box using a depressurizing means and sucking air from the coating port, thereby preventing the paint from leaking from the coating port, and moving the base material in pressure contact with the coating port on the outside of the coating box. , preventing air suction in at least a portion of the opening surface of the coating port, guiding the paint to the portion, and coating the portion of the base material exposed to the coating port.

By varying the size and shape of the spout, it is possible to ensure that the spout is sealed when the substrate is pressed into the spout, or to create gaps in selected areas around the opening surface of the spout. It is also possible to cause this to occur.

If the substrate seals the coating spout, it prevents air suction and the paint flows toward the coating spout and coats the portion of the substrate exposed to the coating spout.

When the substrate covers a portion of the spout, a gap is created between the substrate and the spout at a selected periphery of the spout opening, and air suction from the gap covers at least a portion of the spout. or remove excess paint applied to the substrate by its air flow,
It can also be dried.

For example, if the base material covers the lower part of the coating nozzle and there is a gap in the upper part, air will be sucked in from the upper part of the coating nozzle.
As a result, the paint is guided to the portion of the base material exposed to the coating port, and the surface of the base material exposed to the coating port is coated.

Furthermore, by retracting the side wall of the downstream part of the coating port in the direction of movement of the substrate, the substrate is guided along the (!!1 wall) on the upstream side of the coating port, and the substrate covers the coating port. When this occurs, a gap is created between the downstream edge of the periphery of the coating opening and the substrate.The air sucked through this gap flows horizontally by a certain distance toward the upstream side, and eventually forms bubbles. In areas where the air flow does not reach the coating area, the air flow guides the paint and applies the paint to the portion of the substrate exposed in that area.

By providing an appropriate auxiliary means at the coating opening, it is possible to coat even the end portion of a base material having irregularities of any shape.

According to the present invention, even if the paint is supplied beyond the level of the coating port of the coating box, air is sucked from the coating port due to the reduced pressure inside the coating box, thereby preventing the coating L [sakata]. can.

By moving the base material in pressure contact with the coating opening on the outside of the coating box, air suction is prevented in at least a portion of the opening surface of the coating opening, and the paint is guided to the area exposed to the coating opening. Painting can be applied to the base material.

By varying the size and shape of the spout, it is possible to ensure that the spout is sealed when the substrate is pressed into the spout, or to create gaps in selected areas around the opening surface of the spout. It is also possible to cause this to occur.

If the substrate seals the coating spout, air suction is thereby prevented and the paint can flow toward the coating spout and coat the portion of the substrate exposed in the coating spout.

When the substrate covers a portion of the spout, a gap is created between the substrate and the spout at a selected periphery of the spout opening, and air suction from the gap covers at least a portion of the spout. or remove excess paint applied to the substrate by its air flow,
It can also be dried.

For example, if the substrate covers the lower part of the coating spout and there is a gap in the upper part, air will be drawn from the upper part of the coating spout, thereby directing 13 jl to the part of the substrate exposed to the coating spout. The coating can be applied to the surface of the base material exposed to the coating port.

Further, in the moving direction of the substrate, by moving back the side wall of the coating box in the downstream part of the coating port, the substrate is guided along the (!III wall) of the upstream bait of the coating port.

When the base material covers the coating port, a gap is created between the downstream edge of the peripheral area of the coating port and the substrate, and the air sucked from this gap is directed toward the upstream side. The paint flows horizontally and eventually rises as bubbles, but in areas where the airflow does not reach, the paint is guided by the airflow and can be applied to the parts of the substrate exposed in those areas. can.

By providing an appropriate auxiliary means at the coating opening, it is possible to coat even the end portion of the base material having irregularities formed in a lazy shape.

Furthermore, by providing an air suction port on the downstream side of the coating port in the direction of movement of the substrate, excess paint applied at the coating port can be removed by high-speed airflow at the suction port, thereby drying the painted surface.

The coated substrate can be immediately dried to a touch-dry state by a high-speed suction air stream from the coating port and/or the air suction port.

The amount of coating can be adjusted by adjusting the viscosity of the paint, adjusting the negative pressure inside the coating box, adjusting the transport speed of the substrate, adjusting the gap between the substrate and the coating port, etc., but most A desirable method is to keep the viscosity of the paint and the pressure reduction capacity of the pressure reduction means constant, provide a secondary air intake to adjust the negative pressure inside the paint box, and adjust the high-speed air flow at the coating port and/or air suction port. Good to adjust the speed and adjust the paint blow-off star.

This method allows fine adjustment of the coating amount.

Furthermore, by providing an auxiliary means at the coating port, the coating mode can be changed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram of an apparatus for carrying out the method of the invention. The coating box 10 has a coating port 11 on the side surface for applying moth powder to the base material. The top surface of the coating box can be opened for cleaning the inside and inspecting the CIC protection 1, and it is preferable that the lid 12 be able to seal the top surface of the coating box. Information board 13 to guide you
It is desirable that a

The paint supply means 20 includes a paint tank 21. Arrangement y22 leading from the tank to the coating box. It is shown as a pump 23 provided in the distribution.

The pressure reducing means 30 is connected to a pipe 31 that opens at the top of the coating box.
and a vacuum pump 32 that sucks air from the pipe.

The paint is supplied above the level of the coating port 11, and the pressure inside the coating box is reduced by the pressure reducing means 30, so that air from the outside world is sucked from the coating port 11, thereby preventing the paint from draining from the coating port. If you do so, apply a vacuum in the paint box to the extent that air is sucked in at a sufficient rate to prevent paint from dripping from the paint opening.

The base material is placed on the guide plate 13 and moved so as to come into pressure contact with the coating port 11. When the base material is pressed against the coating port 11, if the coating port is completely sealed by a portion of the base material, air is not sucked and the paint is applied to the portion of the base material exposed to the coating port. . In this case, the paint applied to the substrate is scraped off at the periphery of the coating port 11, specifically at the edge on the downstream side in the direction of movement of the substrate, and therefore,
The coating film becomes very thin and a sealing coating is applied.

In this case, an auxiliary air suction port (not shown) is provided on the side of the coating box on the downstream side of the coating port 11 with respect to the direction of movement of the substrate to provide air flow to the coating surface and dry the coating material. Care must be taken to ensure that air suction from this auxiliary air suction port is not obstructed by the base material. When painting only the inner surface of the grooves of a base material that has one or more grooves extending in the moving direction on one flat surface, it is sufficient to press the surface against the coating opening and move it. When the painted base material covers the coating opening, air is sucked in from both ends of the shore, but the middle part of the river exposed at the coating opening is painted in the same calendar pattern as described above, and both sides of the shore and /or the surface of the ridges between the grooves. However, the paint deposited on the surface of the peak is scraped off by the edge on the downstream side of the coating opening, and the paint attached to the inner surface of the opening is blown off only once according to the speed of the airflow. The remaining paint is removed, but not completely blown off, and is dried by the air stream.

Further, the secondary air suction means 40 can be provided at the upper part of the coating box 10 to prevent excessive negative pressure from being generated inside the coating box. The secondary air suction means is shown as having a line 41 and a valve 42 which, by adjusting the valve 42, can also be used to control the scraping of excess paint.

If the cavity size of the coating port 11 is made larger than the height of the base material, the coating port 11 will not be sealed by the base material, and air will flow from the top surface of the base material through the upper part of the coating port 11. and is sucked into the paint box.

The sucked air rises in the paint as bubbles and escapes into the air above the paint box. Due to this movement of air, the paint is guided to the surface of the base material pressed against the coating port 11, and coating is performed.

If the downstream peripheral part of the coating port 11 is set back from the peripheral part of the pond, even if the end of the base material is pressed against the coating port 11,
The coating port is not completely sealed, and air continues to be sucked in from the surrounding area on the downstream side. The sucked air is blown into the paint to a limited extent toward the upstream side, and eventually rises in the form of bubbles as described above. By increasing the dimensions of the coating spout 11 in the direction of movement of the substrate, parts of the substrate can be coated in the region downstream of the coating spout. Moreover, the paint port 11
The air flow in the downstream region of the paint serves to remove excess paint and dry it to touch-dryness. In this case, the wall of the paint box is set back inward on the downstream side of the paint opening 11. This can prevent the painted surface of the base material from coming into contact with the wall surface of the painting box and being damaged. If necessary, a guide means for guiding the movement of the base material can be provided.

In FIG. 1, the paint box 10 includes a paint extraction means 5.
0 is also shown, and when the pressure inside the paint box increases for some reason, the paint is drained into the paint tank before the paint is wetted from the paint port 11. In Figure 1,
The paint removal means 50 is shown as consisting of a pipe 51 and a valve 52. The valve 52 is normally closed, and is an automatic valve that dynamically opens when the pressure inside the paint box exceeds a predetermined pressure, and can be activated by pressure sensing means inside the paint box. . Such pressure detection means and automatic valves themselves are well known, and therefore, the paint removal means, which will not be described in detail, may be provided with a pump, if necessary.

The paint inside the paint box is violently agitated by the air sucked in from the paint port 11 and/or the air suction port 1.1, which prevents sedimentation of the pigment in the paint and also prevents separation of paint components. .

When the sucked air becomes bubbles and escapes above the paint box, the paint liquid is carried away along with the bubbles as droplets. In the 1st (2I), the decompression hand V230
The paint separated by the gas-liquid separation means 60 shown connected thereto is collected in the paint tank 21. Such 2M division means itself may be known. The gas-liquid separation means 60 can also be provided within the coating box. For example, a plurality of baffle plates 61 are provided above the paint box, air containing droplets is blown toward the surface of the paint, and the droplets are shaken off to the surface by gravity and/or centrifugal force. In order to prevent the paint from adhering to the baffle plate or to remove the adhering coating V), the baffle plate may be sprayed with a solvent.

The pressure reduction means is provided in the paint tank 20 instead of in the paint box 10, and the upper part of the paint box and the upper part of the paint tank are communicated with each other through a communication means (not shown), thereby indirectly reducing the pressure inside the paint box. You may do so.

The coating port 11 shown in FIG. 1 is formed on one plane, and therefore there is a limit to the shape of the substrate that can be coated with it. It is desirable to share the same equipment for painting the ends of base materials of different thicknesses, painting different widths on one surface of the base material, and painting uneven surfaces of the base material.
An easily replaceable adapter can be used to change the size and shape of the device. In other words, the dimensions and shape of the coating port 11 are set to the maximum expected size and shape, and adapters having coating ports 11 of different dimensions and shapes can be attached and detached using appropriate fixing means such as bolts and nuts. Installing. 212th! Some embodiments of such adapters are shown schematically in . In these figures, the paint box 10 has a U-shaped i as shown in No. 2I2Ia.
14, and a U-shaped coating port 11 is provided along the inner surface of the groove, and the adapter 15 has a generally U-shaped cross-sectional shape that fits into the groove. It is shown. However, it is easy to understand that it is not essential to provide a coating box with a full 1.1 concentration.

FIG. 2 is a partial sectional view of the area of the coating port 11 of the coating box 10 cut along a vertical plane, showing an embodiment of the adapter 15 suitable for coating the end of a base material having a rectangular cross section. ,
The adapter 15 installed in the groove 111 has a U-shaped cross section, its outer surface matches the inner surface of the groove 14 of the coating box 10, and the adapter 15 has a U-shaped cross section at a position corresponding to the coating port 11. A U-shaped opening 16 is provided across the bottom wall of the adapter and a portion of each opposing side wall. This results in
The U-shaped opening of the coating port 11 is substantially limited by the opening of the adapter 15. The bottom wall of the adapter 15 is connected to the opening 1 in the side wall of the adapter upstream of the opening 16.
6, and is set back to the plane indicated by 18 on the downstream side of the opening 16. Although not shown in the drawings, the adapter 15 is fixed to the paint box by suitable fastening means. In order to make the drawings clear, it is shown as if there is a slight gap between the cross-sectional outer shape of the base material S and the cross-sectional inner shape of the adapter 15, but in reality, there is almost no gap between the base material S and the cross-sectional inner shape of the adapter 15. The material S is guided along the bottom wall on the upstream side of the opening 16 ((a plane passing through the periphery of the opening indicated by 17 in 2I).
When the paint box 10 is not covered, the reduced pressure inside the paint box 10 causes the paint to move in the direction perpendicular to the opening surface (from the right side to the left side in the figure).
Air from the outside world is sucked in. Assuming that when the substrate approaches the opening 16, the edge of the substrate partially covers the opening 16 and the negative pressure inside the paint box remains unchanged, the speed of the air flow that is drawn in will increase, but the air The flow direction of the flow remains largely unchanged in the area covered by the substrate in the opening 16, and the air flow guides the paint so that the portion of the substrate exposed to the opening 16 begins to be coated. When the base material passes through the opening 16,
The above-described features of the bottom wall of the adapter leave a free gap only at the downstream periphery of the opening 16, through which outside air is sucked at high speed due to the reduced pressure inside the paint box. At this time, the air flow sucked into the paint flows downward toward the upstream side, but eventually becomes bubbles and rises, escaping into the air above the painted joints. If there is an area upstream of the opening 16 that this airflow does not reach, the paint in that area is dragged by the airflow and guided to the surface of the base material exposed to the opening 16, and painting is performed. That is understandable. On the other hand, the air flow sucked through the above-mentioned gap blows off excess paint from the painted surface S1 of the wood end, which has already been painted, and dries the painted surface. On the downstream side of the opening 16, the above-mentioned features of the bottom wall of the adapter allow the painted side of the substrate to be moved without contacting the bottom pan of the adapter;
Therefore, the painted surface is not damaged. If necessary, means for guiding the base material may be provided so that the painted surface of the base material does not come into contact with the bottom wall of the adapter.

FIG. 2C is also a cross-sectional view similar to that shown in FIG. In this embodiment, the upper corner of the cross section of the adapter 15 is deformed into a shape similar to the cross-sectional shape of the end of the base material, and the opening 16 is The second [
It is similar to the Ub adapter. The coating opening 11 is limited by an opening 16 of the adapter 15, and the portion of the substrate exposed to the opening 16 is coated. On the downstream side of the opening 16, the portion of the inner wall of the adapter corresponding to the opening 16 is set back, so that the painted surface S of the base material is
1, the excess coating T1 is removed and the painted surface is dried.

FIG. 2d is also a similar cross-sectional view, showing the adapter 15 applied to the reinforcing coating of the real part of the base material S having stamens. In this embodiment, the adapter 15 has a wide cross-sectional shape. Except for the fact that it is deformed into a shape similar to the cross-section 5 of the base material and that the opening 16 is formed across the received bottom part of the adapter 15 and a part of the pair of side walls. It is similar to the adapter shown in the figure.

A second [kct] is also a similar cross-sectional view, showing an adapter 15 suitable for reinforcing coating of the real part of the base material S having solid nuts,
This embodiment is similar to the embodiment shown in FIG. 2 except for the same items as shown in FIG. 2d, and therefore will not be described in detail.

No. 212. 2 is also a similar sectional view showing an adapter 15 suitable for painting the end of a base material having a rectangular cross section and a portion of the front and back surfaces at the corners of the end. This embodiment is substantially the same as the previous embodiment, with the only difference being that the opening 16 of the adapter is formed over a wider portion of the pair of side walls, and therefore no further explanation is necessary.

The third ciI is the opening 1 of the coating port 11 or the adapter 15.
FIG. 6 is a cross-sectional view of an auxiliary means 70 and a base material S.
1, and has a paint scraping surface on which parallel protrusions indicated by peaks 72 and troughs 73 are formed. The auxiliary means 70 is positioned and fixed by an appropriate fixing means so that the protrusion is oriented in the moving direction of the base material and the paint scraping surface is brought into contact with the base material on the downstream side of the coating port 11. It is clear without further explanation that this allows a striped coating to be applied to the surface of the substrate. ! ! Let's have sex.

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

For example, the direction of relative movement between the base material and the coating port during the coating process does not need to be linear.

It will also be clear that the shape of the paint scraping means can be varied in a variety of ways, thereby providing a variety of coating features.

The pressure reduction means does not need to be directly connected to the paint box; for example, the pressure reduction means may be connected to the paint tank, and communication means may be provided to allow air to flow between the upper part of the paint box and the upper part of the paint tank. In some cases, the pressure inside the box 11 may be reduced indirectly.

By moving the substrate so as to provide different gaps between the coating opening and the substrate, it is also possible to apply different coating thicknesses to different parts of the painted surface.

In the above description, the uneven shape on the surface of the base material is the unevenness of the concave outer shape of the base material, for example, the ball f! No mention was made of the coating of substrates that have unevenness in the direction of movement of the substrate, such as in the case of . However, it goes without saying that the method of the present invention can be applied to coating a substrate having such an uneven shape.

It is also possible to use two coating devices to coat opposing surface portions of the substrate simultaneously or at staggered times.

From the above =1 light, it will be understood that the method of the present invention allows partial coating of a substrate to be performed easily, economically, and efficiently.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of an apparatus for carrying out the method of the invention, and FIG. 2 is a sectional view showing a perspective view of a modified version of the apparatus and some embodiments of adapters used therewith. , FIG. 3 is a sectional view showing an embodiment of the assisting means for changing the coating mode. Explanation of symbols 10: Painting box, 11: Painting port, 12: Lid, 13: Guide plate, 14: U-shaped vortex, 15: Adapter, 16: Adapter opening, 17: Edge, 18: Surface , 20: Paint f+ supply means, 21: Paint tank, 22: Piping, 23: Pump, 30: Pressure reducing means, 31: Piping, 32: Vacuum pump, 4
〇 Secondary air suction means, 41, 42. Valve, 50: Paint scraping means, 51. C552: Valve, 60: Air-liquid means, 61. baffle plate, 70: auxiliary means, 71 nib block, 72: peak, 73, valley;

Claims (1)

[Scope of Claims] [1] A paint box having a coating port on the side wall for applying paint to a portion of the base material is supplied with paint beyond the level of the coating port, while the inside of the coating box is depressurized. The paint is prevented from overflowing from the coating port by suctioning air from the coating port, and the part of the base material to be coated is brought into pressure contact with the coating port on the outside of the coating box and moved. A method for partially painting a base material, comprising guiding a paint to at least a part of an opening surface of a mouth, thereby painting a part of the base material. [2] In the method according to claim 1, when the base material is pressed into contact with the coating port, the coating port is arranged so that when the base material is pressed into contact with the coating port, the base material and the peripheral area of the coating port are connected to each other in a selected peripheral area of the opening of the coating port. A method for partially painting a base material, characterized in that the size and shape are such that a slight gap is created between the base material and the paint is guided to a part of the base material by suctioning air from the gap. [3] The method according to claim 2, wherein the gap is formed by making the height of the coating port larger than the height of the base material. Partial painting method. [4] In the method according to claim 2, the gap is such that when the base material is brought into pressure contact with the coating spout, the downstream edge of the coating spout is wider than the other edges in the moving direction of the base material. The base is formed by retracting inward and is characterized in that excess paint applied on the upstream side of the coating spout is removed by an air stream flowing in at high speed from the downstream edge of the coating spout. How to partially paint wood. [5] In the method according to claim 1, an air suction port is provided on the downstream side of the coating port in the moving direction of the substrate, and excess paint applied at the coating port is removed by high-speed air flow at the suction port. A method for partially painting a base material, characterized by removing the base material.