JPH02203959A - Painting apparatus - Google Patents

Abstract

PURPOSE:To apply good painting to an object to be painted by providing a paint supply means for supplying an excessive amount of paint to the groove part of the object to be painted, a compressed gas spraying means for flowing away the upper layer part of the paint layer of the groove part of the object to be painted and a roll coater for forming a paint film having a uniform thickness. CONSTITUTION:In a paint supply means 10, an excessive amount of paint is supplied to the groove part of the object 4 to be painted fed by the feed means 2 of the object 4 to be painted. In a compressed gas spraying means 20, the upper layer part of the paint layer formed to the groove part of the object 4 to be painted fed by the means 2 after receiving the supply of the paint is blown away to be removed out of the groove part. Further, in a roll coater 30, the paint layer part having an excessive film thickness at the part other than the groove part of the object 4 to be painted, which is led by the means after the upper layer part of the paint layer applied to the groove part by the means 20 is blown away to be removed, is leveled and the paint is supplied to the paint layer part having an excessively reduced film thickness and a part where the paint layer is absent to form a film having a uniform thickness. As a result, the object to be painted especially having the groove part can be easily and well painted in a desired thickness.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coating device, and in particular, the present invention relates to a coating device, and in particular,
The present invention relates to a coating device that can continuously coat to a desired thickness.

[Prior art and problems to be solved by the invention] Conventionally,
Various types of devices have been proposed as devices for continuously painting objects to be coated while conveying them on a conveyor in a mass production factory.

For example, when painting a flat plate, conventionally the paint is
Air spray type or airless spray type equipment, which atomizes fine particles with a diameter of 80 lumens for coating, or roll coaters or curtain flow coaters are used.

However, the above-mentioned air spray painting equipment and airless spray painting equipment have poor coating efficiency because they atomize the paint, and a large amount of paint mist scatters, causing contamination of equipment and causing health and safety hazards. and may cause pollution.

Furthermore, in the above-mentioned spray coating equipment and flow coater, since the coating film thickness changes depending on the conveyance speed of the object to be coated, it is necessary to accurately control the conveyance speed.

Incidentally, recently, there has been an increasing demand for coating objects having grooves for reasons of design and other reasons. However, the roll coater has a drawback in that it cannot coat the grooves.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a coating apparatus that does not have the above-mentioned problems of the prior art and can easily and satisfactorily coat objects having grooves to a desired thickness.

[Means to solve the problem] According to the present invention, the above objectives are achieved.

A coating device for a workpiece having a groove, comprising: a workpiece conveyance means; a paint supply means for supplying an excessive amount of paint to the groove of the workpiece conveyed by the workpiece conveyance means; , pressurized gas blowing means for blowing away the upper layer of the groove paint layer of the object to be coated, which is conveyed by the object conveying means after receiving the paint supply from the paint supply means, to remove it from the groove; After the upper layer of the paint layer in the groove is removed by the pressurized gas blowing means, the excessive thickness of the paint layer in the parts other than the groove of the object to be coated being conveyed by the distributed coating conveyance means is smoothed out. A coating device characterized by having a roll coater for supplying paint to a paint layer portion with a small film thickness and a portion where no paint layer exists to form a paint film of uniform thickness. Ru.

[Example] Hereinafter, specific examples of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic side view showing an embodiment of a coating apparatus according to the present invention, and FIG. 2 is a schematic plan view thereof.

In the figure, 2 is a flat feed roller conveyor which is a means of conveying the object to be coated. The conveyor has three parts 2a, 2
It consists of b and 2c. A is the conveyance direction of the conveyor. Reference numeral 4 denotes an object to be coated that is conveyed in the A direction via parts 2a, 2b, and 2c of the conveyor 2 in sequence.

A paint dripping device 10, which serves as paint supply means for the grooves of the object 4, is arranged above the conveyor portion 2a.

The paint dripping device includes a paint tank 12, a head 14 that receives paint from the paint tank, and a nozzle 18 attached to the head via a flow rate regulating valve 16. A plurality of pairs of valves 16 and nozzles 18 are arranged in a horizontal direction perpendicular to the conveyance direction A of the object to be coated, and are movable in the horizontal direction so that their positions can be set as appropriate. In the paint dripping device 10, the paint in the paint tank 12 is supplied to the head 14 by the action of gravity, and is further supplied to each nozzle 18 according to the opening degree of each valve 16, and is then supplied to the groove on the upper surface of the object 4. supplied within. Reference numeral 19 is a paint recovery tank for receiving paint that has not adhered to the object to be coated.

Above the conveyor portion 2a, and on the downstream side with respect to the conveyance direction A of the object to be coated, a leveling means 8 is arranged, which is a means for leveling the paint layer in the grooves of the object to be coated 4.

A plurality of the leveling means are arranged in a horizontal direction perpendicular to the conveying direction A of the object to be coated, and each of them is movable in the horizontal direction, so that the position can be set as appropriate. The leveling means is, for example, a spatula, wire, wool roll, rag, etc.

A pressurized air blowing means 20, which is a pressurized gas blowing means, is arranged between the conveyor portions 2a and 2b. The blowing means has a blower 22 which is a source of pressurized air, and an air nozzle 24 which receives pressurized air from the blower. The air nozzle is located on one side of the movement path of the object to be coated conveyed by the conveyor 2, and has a slit formed in its lower part for discharging pressurized air. Second
As shown in the figure, the air nozzle 24 forms an angle α with the long hair direction (slit direction) and the horizontal direction perpendicular to the conveyance direction of the object to be coated, and the angle α can be changed. It is installed in the same way. The angle α is, for example, 0 to 60 degrees. Further, as shown in FIG. 3, the air nozzle 24 has an angle β between the direction of pressurized air discharged from its slit and the upper surface of the object 4, and the angle β cannot be changed. It is installed so that it can be done. The angle β is, for example, 20 to 90 degrees. The slit width of the air nozzle 24 is, for example, 0.5~. 10mm
, preferably 0.5 to 5 mm. The distance between the air nozzle and the object to be coated is set to, for example, 5 to 100 mm, preferably 10 to 20 mm. Further, the pressure of the pressurized air discharged from the air nozzle 24 is, for example, 5
00-3000 mm Aq, preferably 1000
~1300mmAq.

As shown in FIGS. 1 and 2, below the air nozzle 24 and below the moving path of the object to be coated, there is a hole for receiving the paint that has been removed from the groove of the object and fallen out of the object. A paint recovery tank 26 is arranged, and as shown in FIG. 2, an exhaust device 28 for exhausting the discharged air is provided.

Note that the number of the air nozzles 24 is not limited to one, and two or more may be arranged in parallel to spray pressurized air in multiple stages, as shown in FIG. 4(a). , a modification is possible, such as arranging two of them as shown in FIG. 4(b) and blowing air outwards to approximately half of the object 4 in the width direction separately.

A roll coater 3 is provided between the conveyor portions 2b and 2c.
0 is placed. A coating roll 32 and a doctor roll 34 are arranged above the moving path of the object to be coated carried by the roll coater coater 2, and a doctor roll 34 is arranged corresponding to the coating roller 32 below the moving path of the object to be coated. Pack unroll 36 and I1
do. These rolls preferably have a single-cell or open-cell sponge layer that is well impregnated with paint, and examples of the material for the sponge include ethylene propylene rubber, nitrile rubber, and urethane rubber. It is preferable that the thickness of the sponge layer is, for example, 5 to 25 mm.

In FIG. 1, 38 is a head for supplying paint to the coating roll and doctor roll, and 40
4 is a paint recovery tank for receiving paint that has not adhered to the object to be coated, and 42 is a paint tank. 44 is a pump for supplying paint from the paint tank to the end 38.

Note that 46 is an adjustment handle for setting the vertical position of the coating roll 32 with respect to the backup roll 36, and 48 is an adjustment handle for setting the horizontal position of the doctor roll 34 with respect to the coating roll 32.

FIGS. 5(a) to 5(d) are diagrams showing the coating process in the above embodiment. Here, three grooves 4. The case where there are a-1, 4a-2, and 4a-3 is shown. Then, the object to be coated is transported so that the direction of the groove portion is parallel to the direction of the object. Note that in these figures, the groove 4a-1 is shown in the state before each step is executed, and the groove 4a-2 is shown in the state when each step is executed. Regarding 3, the state after each process is executed is shown.

FIG. 5(a) is a cross-sectional view showing the paint supply state by the paint droplet device 10, in which the paint is dripped and supplied from the nozzle 18 to the groove portion of the object 4 to be coated. A paint layer 50 of an appropriate thickness is formed in the groove of the object 4 that has passed below the nozzle. The amount of paint supplied is set so that the thickness of the paint layer is sufficiently thicker than the target thickness (tl) in the next step of spraying with pressurized air.

FIG. 5(b) is a cross-sectional view showing the state in which the paint layer in the groove is leveled by the leveling means 8, in which the paint layer 50 is swept by the leveling means 8. The paint layer 50 in the groove of the object 4 that has passed under the leveling means is made uniform in the longitudinal direction of the groove, and the paint is also applied to a part of the side wall surface of the groove.

FIG. 5(C) is a cross-sectional view showing the state in which the upper layer of the paint layer in the groove is removed by the streamer by the pressurized air blowing means 20,
Pressurized air is discharged from the air nozzle 24 to the object 4 to be coated. Below the nozzle, the upper layer of the paint layer 50 in the groove of the object 4 exceeding the target thickness tl is blown away by the discharged pressurized air, and the blown paint is blown away from the side wall surface of the groove. A paint layer of approximately the same thickness is formed over the entire area, and is further removed from areas other than the grooves (the surface 4b and side surfaces of the object to be coated). The paint layer 50 in the groove of the object 4 that has passed under the air nozzle 24 has a uniform thickness tl over the entire surface, and the surface portion 4 other than the groove has a substantially uniform thickness tl.
At the boundary with the groove, a layer of paint that has been blown off from within the groove is formed on b.

FIG. 5(d) is a cross-sectional view showing the state of paint application and leveling by the roll coater 30, and as described above, the pressurized air is sprayed onto the surface portions 4b of the treated object 4 other than the grooves. A paint layer 52 having a thickness of t2 is newly formed. Here, in the part where the paint layer 50 formed by blowing away from the groove exists at the boundary with the groove, if the thickness of the paint layer 50 is less than t2, the thickness of the paint layer 50 is less than t2. The paint layer 52 is formed by a roll coater until the sum of t2 becomes t2, and the paint layer 50 is
If the thickness exceeds t2, the coating roll 32
Accordingly, the paint layer 50 is subjected to a leveling treatment to have a thickness t2.

The paint for forming the paint layer 52 is substantially the same as the paint for forming the paint layer 50 described above.

In the manner described above, a coating film of a desired thickness can be formed in the groove portion and the portion other than the groove portion, and the coating film is dried and cured by an appropriate means.

Although the leveling means 8 is used in the above embodiment, the leveling means may be omitted when painting an object having a relatively narrow groove.

In the above embodiments, the object to be coated has straight grooves arranged in parallel in only one direction, but the grooves may have a shape other than a straight line (for example, a zigzag shape). In this case, the nozzle 18 of the paint dripping device 10 L and the leveling means 8 may be controlled to follow the groove as the object moves.

In addition, when the object to be coated has grooves that intersect in two directions, the steps from the paint dripping device 10 to the pressurized air spraying means 20 are provided in two stages, and first, as shown in FIG.
The object 4 to be coated is conveyed in the posture shown in FIG. 6(b), and the process from dropping paint to spraying pressurized air is carried out on the groove in the first direction, and then in the posture shown in FIG. 6(b). The object to be coated 4 is transported by the roller coater, and the process from dropping the paint to spraying pressurized air is carried out on the groove in the second direction.
By performing the painting, it is possible to perform the same painting as in the above embodiment.

[Effects of the Invention] As explained in detail above, according to the coating device of the present invention,
Both the groove portion and the portion other than the groove portion of an object to be coated having a groove portion can be coated easily and stably to a desired thickness.

Furthermore, the coating apparatus of the present invention can be configured with a simple combination of equipment, has fewer troubles during operation, and can perform high-speed coating.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of a coating apparatus according to the present invention, and FIG. 2 is a schematic plan view thereof. FIG. 3 is a diagram showing the relationship between the direction of pressurized air discharged from the air nozzle and the object to be coated. FIGS. 4(a) and 4(b) are diagrams showing the arrangement of air nozzles when a plurality of air nozzles are used. FIGS. 5(a) to 5(d) are diagrams showing the coating process in the coating apparatus of the present invention. FIGS. 6(a) and 6(b) are diagrams showing the conveyance posture of the object to be coated. 2: Conveyor, 4: Object to be coated, 4 a-1 to 4 a-3: Groove, 4b two surface portion, 8: Leveling means, 10: Paint dripping device, 18: Nozzle, 20: Pressurized air spraying means , 24: Air nozzle, 30 Color coater 32: Coating roll, 34: Doctor roll, 36: Backup roll, 50, 52: Paint layer. Ku

Claims (3)

[Claims] (1) In a coating device for coated objects having grooves,
a means for transporting an object to be coated, a paint supply means for supplying an excessive amount of paint to a groove portion of the object to be coated conveyed by the means for transporting an object to be coated, and a method for supplying the above-mentioned material after receiving the paint supply from the paint supply means. Pressurized gas spraying means for blowing away the upper layer of the grooved paint layer of the object being coated conveyed by the object conveying means to remove it outside the groove; and a blowing out of the upper layer of the grooved paint layer by the pressurized gas blowing means. After being removed, smooth out the excessively thick paint layer in the parts other than the grooves of the object conveyed by the object conveying means, and smooth out the excessively thick paint layer in the areas other than the grooves of the object conveyed by the object conveying means, and also smooth out the overly thick paint layer and the areas where there is no paint layer. A coating device comprising a roll coater for supplying paint and forming a coating film of uniform thickness. (2) After the paint is supplied by the paint supply means and before the upper part of the groove paint layer is removed by the streamer by the pressurized gas spraying means, the object to be coated is transported by the object transporting means. 2. The coating device according to claim 1, further comprising means for leveling the paint layer in the groove. (3) The coating apparatus according to claim 1, wherein the pressurized gas spraying means is capable of adjusting the angle at which the pressurized gas is sprayed onto the object to be coated.