JPS63240970A - Coating method - Google Patents

Abstract

PURPOSE:To form a coated surface having better smoothness of the coated film than before if the thickness of the film is the same by coating a paint in the thickness beyond the sagging limit, and rotating a material to be coated around the horozontal axis while reversing the material. CONSTITUTION:A paint is coated in the thickness beyond the sagging limit in the coating stage, and the material to be coated is rotated around the horizontal axis while reversing the material in the drying stage. As a result, a high- quality coated surface having better smoothness than before can be obtained if the thickness of the paint is the same. In addition, the concentration of the paint on the corner of the material to be coated is prevented, and the extreme thickening of the coated film on the corner can be prevented.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a coating method.

(Prior art and its problems) When painting the outer surface of an object to be painted, such as an automobile body, there are a preparation process for removing dust adhering to the object, a process for applying paint to the object, and a coating process. and a drying step of drying the painted paint. For example, in the case of thermosetting paints, this drying process is carried out in two stages: a setting process and a baking process, and the setting process is performed before the baking process.
This baking process is carried out at a temperature lower than that of the baking process, for example, at room temperature or in a temperature atmosphere of 40'' to 60°C (also called calcination) (the baking temperature in the baking process is usually around 140°C).

The object to be coated is usually transported by means of transport such as a trolley while undergoing the above-mentioned waiting, painting, and drying steps, but the object to be coated is kept in a predetermined posture during each step. It is still being done.

By the way, one of the criteria for evaluating the quality of painted surfaces is:
It has smoothness (flatness), and the greater the smoothness, the smaller the degree of unevenness on the painted surface, and the better the painted surface. It is already known that in order to improve the smoothness of the painted surface, it is sufficient to increase the thickness of the paint film, that is, the film thickness of the applied paint.

On the other hand, the degree of paint
This sagging is caused by the applied paint flowing downward under the influence of gravity, and the thicker the paint that is applied at one time, the more likely it is that sagging will occur. "The cause of droop is ultimately the effect of gravity, so it is more likely to occur on surfaces of the object to be coated that extend in the vertical direction, that is, so-called vertical surfaces.

Therefore, on surfaces extending in the horizontal direction of the object to be coated, that is, so-called lateral surfaces, where the degree of sagging of the paint is less of a problem, the thickness of the paint applied can be made larger than on the vertical surfaces. In addition, even if the thickness of the paint film on the horizontal surface and the thickness of the paint film on the vertical surface are the same, the unevenness on the horizontal surface will be reduced due to slight flow of the paint that does not cause sagging.
This results in better smoothness than in the vertical plane.

From the above-mentioned point of view, conventionally, in order to obtain a coated surface as smooth as possible while preventing the paint from sagging, painting was carried out using a paint with as little fluidity as possible. The so-called ``° sag limit'' where paint ``sag'' occurs on the vertical surface is, for example, a maximum coating thickness of about 40 JLm for thermosetting paints. Sagging is likely to occur during the setting process and baking process, especially during the baking process.In order to prevent sagging during this period, the thickness of the paint to be applied during the painting process is determined. Maximum value, sag limit value is 40g
It will be about m. Therefore, if you want to obtain a painted surface with even greater absolute smoothness, using conventional painting methods,
For example, it was necessary to repeat the series of steps from the painting process to the baking process multiple times in case of two-coat hats.

The present invention was made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a coating method that allows a coated surface with greater smoothness to be obtained with the same coating thickness. shall be.

(Means and effects for solving the problem) The present invention basically improves the fluidity of the paint by appropriately changing the direction of gravity acting on the paint applied to the object to be coated. By actively taking advantage of this, you can obtain a coated surface with greater smoothness for the same coating thickness. Specifically, the configuration is as follows. That is, in a coating method comprising a coating process of applying paint to an object to be coated, and a drying process of drying the paint applied to the object, in the coating process, the thickness is below the sag limit. The paint is applied, and in the drying step, the object to be coated is rotated while being inverted around a horizontal axis.

In this way, in the present invention, the direction of gravity acting on the paint applied to the object to be coated is changed by rotating the object in the horizontal direction, so that the paint does not sag.
It will dry without causing any damage.

According to the present invention, the film thickness of the paint applied per coat can be made much thicker than before, and an extremely good painted surface with smoothness that far exceeds the level conventionally considered to be the limit can be obtained. can.

Further, even when the thickness of the coating film is the same as that of the conventional coating, the fluidity of the coating material can be utilized to obtain an excellent coated surface with smaller irregularities, that is, greater smoothness.

Furthermore, if you try to obtain a painted surface with the same smoothness, for example, the same level of smoothness as that obtained with conventional painting methods,
The film thickness of the paint to be applied can be made thinner than in the conventional method, and the number of fake paints used can be reduced by the amount that can be made thinner.

Of course, a paint that causes "sagging" even in a thin film can be obtained by reducing a predetermined proportion of components that inhibit fluidity in conventional paints.

In addition, in the present invention, since the object to be coated is rotated while being reversed, a situation where a large amount of paint locally accumulates at the corners of the object, i.e., the resulting painted surface This prevents the situation where the coating film becomes locally thick at the corners and becomes hilly. To explain this point,
Before dry explosion, the paint tends to be locally concentrated at the corners on the lagging side of the rotational direction due to the rotation of the object to be coated, and the paint concentrated at these corners remains in that position due to its surface tension. There is a tendency to try to keep the . However, in the present invention, since the rotation of the object to be coated is reversed,
This prevents the paint from concentrating on the corners, and even if it once concentrates, it will flow and diffuse again in the direction away from the corners (of course, this flow and diffusion will not cause sagging). . This reliably prevents a situation in which only the coating film at the corner portions locally bulges out.

As described above, according to the present invention, it is possible to obtain a high-quality painted surface that not only has good smoothness but also has no raised corners.

(Example) Hereinafter, an example of the present invention will be described based on the attached drawings.

Overall Overview FIG. 1 shows the overall process for painting an automobile body W as an object to be coated, and each process is indicated by PI-P4.

First, the body W, which has been undercoated by Den27 coating in a known manner, is sent to the preparatory step PL while being held on a trolley. In this preparation step P1, dust inside and outside the body W is removed by, for example, air blowing or vacuum suction.Next, in step P2, paint is sprayed onto the body W, and then the drying of the paint is carried out in setting step P3 and This is done in the baking step P4.

If step PI-P4 is for intermediate coating, the body W is sent to the top coating step after step P4. Also, process P
If i-P4 is for topcoating, the body W is transported to an assembly line in a known manner.

It is preferable to remove dust in the dust removal step P1 while rotating the body W around the horizontal axis as shown in FIG. After the rotation of the body W is stopped and the dust is removed, as shown in Fig. 2 (b).
), the body W is stopped at this position, and the dust is removed again. In this way, the second
Dust is removed while the body W is intermittently rotated as shown in (C), (d), . . . (i) in the figure.

In this way, by removing dust while rotating the body W, for example, dust attached to the inside corner of the roof panel of the body W or inside the closed cross section of the side sill shade can be removed. It becomes possible to completely remove even the garbage that does not fall.

The rotation range of the body W is 36 degrees as shown in FIG.
It may be rotated by 0°, but it may also be adjusted to match the rotation angle range of the body W in the drying process, which will be explained later.

Spraying of Paint First, the spraying of paint at P2 is carried out so that the thickness of the paint film is less than the sag limit. In other words, in conventional thermosetting paints, the maximum thickness of the paint that does not cause sag, that is, the sag limit value, is about 40 μm, but in process P2, the sag limit is 40 JL.
The paint is sprayed to give a coating much thicker than m (for example 65 lm).

After this P2, the process moves to a setting step P3.

In this setting step P3, the second rA(a) to (i
) The body W is rotated in the horizontal direction while being reversed within an angular range of a maximum of 360°. That is, the body W is rotated around a rotating shaft 6 extending in the horizontal direction, and in the embodiment, this rotating shaft edge stand extends in the front-rear direction of the body W. In addition, this setting process P
In the example, the temperature atmosphere in 3 was set to room temperature, but in 4
The temperature can be set at an appropriate temperature in the range of 0'' to 60'C, etc., lower than the temperature atmosphere in the next baking step P4.Of course, this setting step P3 is performed.

This is to volatilize the low-temperature seafood in the paint in advance.
This prevents the occurrence of bottle holes on the painted surface due to rapid volatilization of low-boiling seafood in the next baking step P4.

In the baking step P4, the paint is baked in an atmosphere at a temperature of 140° C., for example. Even in this P4, P
Similarly to the setting step No. 3, the body W is rotated in the horizontal direction while being reversed.

Due to the horizontal rotation of the body W at P3 and P4 described above, even if the paint is sprayed to a thickness exceeding the sag limit at P2, the paint dries without sagging. As a result, a high-quality coated surface with extremely high smoothness that could not be obtained with conventional coating methods can be obtained. In addition, since the coating is inverted, only the corner portions of the body W can be prevented from being water-filtered such that the coating process becomes extremely thick and bulges.

The reason why the body W is rotated in both processes P3 and P4 is because thermosetting paint is used which causes sagging in both processes P3 and P4, and in the case of powder paint, the baking process P4 In the case of a two-component curing type paint, it is sufficient to perform this rotation only during the setting process.

Here, the body W may be reversed, for example, as follows. In other words, when considering one cycle of rotation of the body W with reversal using the position in Fig. 2(a) as a reference position, from the state in Fig. 2(a), the forward rotation direction (clockwise direction in Fig. 2) and the reverse direction They only need to be rotated by a predetermined angle relative to each other. For example, if both the L predetermined angles are 90°, the body W
In Fig. 2, the change in posture is as follows: (a) → (b) → (C
)→(b)→(a) (i)→(h)→(g)→(h
) → (i) (a) constitutes one cycle. Of course, the above (C
) and (g), inversion is performed. As another example, if both the above predetermined angles are 135@, then l cycle is (a) → (b) → (C) → (d) → (C) →
(b) → (a) (i) → (h) → (g) → (B − (g
)→(h)→(i)(a). The reversal at this time is performed at (d) and (f).

Of course, the above-mentioned predetermined angle may be determined so that the direction of gravity acting on the paint (particularly paint applied on a vertical surface) is changed, and the shape of the object to be coated, especially the position of the corner, is taken into consideration. .

Therefore, FIGS. 2(a) to (b), (C), and (d)
The method of rotation accompanied by reversal can be set as appropriate, such as rotating it in order to (i) (after rotating it by 360') and then rotating it again by 360 degrees in the opposite direction.

In addition, by changing the trolley between P2 and P3, P
3. It is best to keep paint from adhering to the trolley used in the drying process in P4. In other words, in P2, a considerable amount of paint will be sprayed onto the truck, but if the truck with this paint adhered is used as is and transferred to the drying process, the paint adhered to the truck will be sprayed onto the truck. This is because as the car travels, a considerable amount of paint may peel off and become dust, which may impair the quality of the painted surface.

Relationship between coating film J, sag limit, smoothness, and horizontal rotation Figure 3 shows the influence of coating film thickness on sag limit when focusing on thermosetting paints. This third
In the figure, the coating film thickness is 40pm, 53JLm, 65
Three cases of g and m are shown. It is understood that for any of these thicknesses, "sag" peaks occur both at the beginning of the setting process and at the beginning of the baking process. In addition, the sag limit is the value when the sag normally occurs at a rate of 1 to 2 mm per minute (the painted surface is considered to be defective if the sag occurs at a rate of 2 mm/min or more when visually observed); The maximum film thickness obtainable in the range is around 40 gm with conventional paints.

On the other hand, FIG. 4 shows the effect on the smoothness when the body W is rotated in the horizontal direction and when it is not rotated. A in FIG. 4 shows a state in which the body W is not rotated (conventional painting method). Figure 4B shows the body W
This figure shows the case where it is rotated by 90 degrees and then reversed (forward and reverse rotation between FIG. 2(a) and FIG. 2(C)). Figure 4C is
This figure shows the case where the body W is rotated by 135 degrees and then reversed (17 reverse rotations between FIG. 2(a) and FIG. 2(d)).

The fourth diagram shows a case where the body W is rotated 180' and then reversed (forward and reverse rotation between FIG. 2(a) and Ce). FIG. 4E shows the case where the body W is continuously rotated in the same direction (FIGS. 2(a), (b),
(C)... Take the posture in the order of (i) and return to (a) again).

As is clear from Fig. 4, if the thickness of the coating is the same, it is better to rotate the body W (Fig. 4 B, C, D, E).
), thicker smoothness can be obtained than in the case of no rotation (FIG. 4A).

In addition, as is known, IG at the mapping sharpness shown in FIG.
(Image gloss) indicates the ratio of sharpness to the specular surface (black glass) as 100.
GD is a value at which the smoothness of the painted surface decreases as the degree of discrimination of the reflected image decreases from 1.0.

The test conditions for the data shown in FIGS. 3 and 4 are as follows, and these test conditions indicate the conditions when overcoating is performed at P2.

a. Paint: Melamine alkyd (black) Viscosity: Ford cup #4 for 22 seconds/20°C b. G Film machine: Minibell (16, OOOrpm) Shaping air: 2.0 kg 7 cm2 C1 discharge amount: Divide into 2 times The first spraying...
100cc/min 2nd time, 150~200cc/min, Setting time: 10 minutes x room temperature e, Baking conditions: 140"CX25 molecules, Base smoothness: 0.6 (PGD value) (Intermediate coating, PE tape Top) g0 rotation or reversal operating range: Setting (10 minutes) to baking (10 minutes) h, Painting on the side of a rectangular cylinder with a knee side of 30 cm, rotatably supported in the center i, Rotation speed: 6rpm, 30rpm, 60r
pm, but there was virtually no difference due to the difference in rotational speed. A specific example will be explained.

Figure 5 shows the front jig I attached to the front of the body W.
Indicates F. This jig IF consists of a pair of left and right picking brackets 2, a pair of left and right stays 3 welded to each of the left and right brackets 2, a connecting bar 4 that connects the left and right pair of stays 3, and a connecting bar 4. It has a rotating shaft 5 integrated with the bar 4. Such a jig IF has its bracket 2
The portion is fixed to a front strength member of the body W, such as the front end of the front side frame 11. That is, since a bracket 12 for normally mounting a bumper (not shown) is welded to the front side frame 11, the bracket 2 is attached to the bracket 12 on the body W side using a bolt (not shown). and fix it.

The rear jig IR attached to the rear of the body W is shown in FIG. The rear jig 1R has a similar configuration to the front jig IF, and the same reference numerals are given to the components corresponding to the front jig IF. This rear fixing and attachment of the AIR to the body W is performed by fixing the bracket 2 to the floor frame 13 as a strength member at the rear end of the body W with bolts. Of course, a bumper mounting bracket is welded to the rear end of the floor frame 13 to which a bumper is generally mounted, so this bumper mounting bracket can be used to attach the rear jig IR. Installation can also be done.

When the front and rear jigs IF and IR are attached to the body W, their rotating shafts 5 are arranged on the same straight line extending in the front-rear direction of the body W. This same straight line is the axis of rotation SQ of the body W, and preferably, the edge of this axis of rotation passes through the center of gravity G of the body W (see FIG. 7). In addition, since the rotating shaft rim passes through the center of gravity G, large fluctuations in the rotational speed are prevented when the body W rotates. This prevents impact from occurring on the body W due to rotational fluctuations, which is more preferable in terms of sag prevention [E].

Note that the front and rear jigs IF and IR are specially prepared in advance according to the vehicle type (type of body W).

This is a truck that is used by at least Pi, P3, and P4 and has a function of rotating the body W.

In FIG. 7, the trolley has a base 21, and this base 2
Wheels 22 attached to the vehicle 1 are run on a road surface 23. This base 21 includes one front support 24, two intermediate supports 25, 26, and 26, which extend sequentially from the front side to the rear side (from the right side to the left side in FIG. 7) in the running direction. And one rear strut 27 is provided, and between the intermediate struts 25, 26 and the rear strut 27 is a support space 28 with a large gap in the front-rear direction.

The body W is disposed in the support chamber fin 28, and its front part is rotatably supported by the intermediate support 26 using the front jig IF, while its rear part is supported by the rear jig IR. It is rotatably supported by the rear support 27.

The front and rear jigs IF and IR (rotary shafts 5 of them) can be freely engaged with and detached from the columns 26 and 27 from the vertical direction, and the rear jig IR is the rotation shaft! It is immovably engaged in the first viewing direction. For this reason, the middle support 26 has a notch 26a that opens at its upper end surface (see FIGS. 101Δ to 12), while the rear support 26 has a notch 26a that opens at its upper end surface (see FIGS. 101Δ to 12). 7 has a notch 2 on its L end surface.
7a is formed (see FIG. io, FIG. 14, and FIG. 15). These notches 2'6a, 27a are the jig IF,
The size is such that the rotating shaft 5 of the IR can fit therein. A flange portion 5a is formed on the rotating shaft 5 of the rear jig IR, and a notch 27b having a shape corresponding to the flange portion 5a communicating with the notch 27a is formed in the rear support 27. . As a result, the rear jig IR is engaged with and disengaged from the notches 27a and 27b of the rear column 27 from above and below, and is made immovable in the front and rear direction with respect to the rear column 27 by the stopper action of the flange portion 5a. Ru. Note that the rotational force is applied to the body W via the rotation shaft 5 of the front jig IF, and for this reason, a connection portion 5b (see FIG. 5), which will be described later, is provided at the tip of the rotation shaft 5 of the front jig IF. (see also) is formed.

A stay 29 is provided to protrude downward from the base 21,
A traction wire 30 is connected to the lower end of this stay 29. This wire 30 is of an endless type,
It is driven in one direction by a motor (not shown), and thereby the trolley is driven in a predetermined transport direction. Of course, the above-mentioned motor is installed in a safe location from an explosion-proof point of view 1.

In the embodiment, the rotation of the body W is performed by using the movement of the truck, that is, by using the displacement of the truck with respect to the running road surface 23. A rotation extraction mechanism 31 for extracting the displacement of the truck as rotation is configured as follows. That is, the rotation take-out mechanism 31 includes a rotation shaft 32 extended vertically and rotatably supported on a base 21, a sprocket 33 fixed to the lower end of the rotation shaft 32, and a chain 11 fitted to the sprocket 33. It consists of 34. This chain 34 is placed in parallel with the wire 30 in an immovable state relative to the running road surface 23. As a result, when the truck is towed via the wire 30, since the chain 34 is immovable, the sprocket 33 that fits the chain 34 and therefore the rotating shaft 32
is rotated.

The chains 34 are arranged alternately left and right with respect to the sprockets 33 in the conveyance direction in order to perform one reversal.

The rotation of the rotation shaft 32 is controlled by the rotation shaft 5 of the front jig IF.
The transmission mechanism 35 for transmitting the signal is configured as follows. That is, the transmission mechanism 35
The casing 36 fixed to the rear surface of 4 and the casing 3
6, a rotating shaft 37 extending laterally (back and forth) and rotatably supported, a pair of bevel gears 38 and 39 that interlock this rotating shaft 37 and the upper rotating shaft 32, and The connecting shaft 40 is held rotatably and slidably in the front-rear direction. This series of seven sweetfish 40 is spline-coupled to the rotating shaft 37 (this engaging portion is indicated by reference numeral 41 in FIG. 7), so that when the rotating shaft 32 is rotated, the connecting shaft 40 is also rotated. That will happen. Of course, the rotating shaft 37 and the connecting shaft 40 are installed so as to be located above the rotating axis.

The connecting shaft 40 is connected to the rotating shaft 5 of the front jig IF.
be disengaged. That is, as shown in FIGS. 10 to 12, a cross-shaped connecting portion 5b is formed at the tip of the front jig IF rotating shaft 5, while a cross-shaped connecting portion 5b is formed at the end of the connecting shaft 40. 1
As shown in Fig. θ and Fig. 13, a box portion 40 has an engaging recess 40c into which the connecting portion 5b is fitted without rattling.
a is formed. Therefore, for example, by sliding the connecting shaft 40 via the rod 43 by a pneumatic cylinder 42, the box portion 40a (engaging recess 40c) and the connecting portion 5b are engaged and disengaged, and when they are engaged, they are connected. The shaft 40 and the rotating shaft 5 are allowed to rotate together. In addition,
The rod 43 is connected to a connecting shaft 40 as shown in FIG.
The box part 40a is fitted into an annular groove 40b formed on the outer periphery of the box part 40a so as not to hinder the rotation of the box part 40a.

With the configuration shown below, by lowering the body W relative to the trolley while the connecting shaft 40 is displaced to the right in FIG. 7, the rotating shafts 5 of the front and rear jigs IF and IR are , is supported rotatably and immovably in the front-rear direction by intermediate struts 26 and 27. After this, the connecting shaft 40 (locking recess 40C) is connected to the rotating shaft 5 (the connecting portion 5 of the front jig IF).
b) is engaged with. This allows the trolley to be connected to the wire 30.
When the body W is towed through a predetermined horizontal axis, the body W is rotated about a predetermined horizontal axis. In addition, the removal of the body W from the trolley may be performed in the reverse order to the above-described procedure.

Supplementary Explanations Next, supplementary explanations related to the present invention and carts,
Modifications of the painting method, etc. will be explained in sequence.

■When applying the top coat after the intermediate coat, the wet sanding after the intermediate coat baking process can be eliminated. In this case, the body W may be rotated only during either the intermediate coating process or the top coating process. In other words, the quality of the final painted surface obtained after the top coating is determined by the quality of the intermediate coating, but when the body W is rotated during the intermediate coating, the finish level of this intermediate coating is Since the height can be increased, the conventional wet polishing is no longer necessary. Moreover, if the body W is rotated during the top coat, the poor finish of the middle coat can be compensated for by the good finish of the top coat, without the need for wet sanding with the middle coat.

(2) If the body W is to be rotated during topcoating and a thin coating film is to be formed using a topcoat with a small sag limit, it is recommended to use a so-called color intermediate coating. As a result, even if the intermediate coat paint is seen through the top coat paint, there is no equal support in terms of color tone.

■Regardless of whether the platform 1tjD is running or stopping, switching between rotating and stopping the body W and changing the direction of rotation can be done by using a separate dedicated actuator such as an air motor, but it can also be done as follows, for example. Can be done. First, in the example shown in FIG. 7, a pair of first and second chains (corresponding to the chain 34) that mesh with the sprocket 33 from opposite sides in the radial direction are inserted, and each chain is driven as appropriate. Sip as much as possible. With such a configuration, the rotation of the body W is controlled according to the following drive mode.

■Stopping the first chain and freeing the second chain: In this case, the body W is rotated in one direction as the trolley moves.

(1) First chain free and second chain stopped: In this case, the body W is rotated in the opposite direction to (2) as the trolley moves.

■Both chains are free: In this case, the body W is not rotated as the trolley moves.

- Drive the first chain in one direction and free the second chain: In this case, even if the truck is stopped, the body W is rotated in one direction.

■Drive the first chain in the other direction and make the second chain free (same as if the first chain is free and the second chain is driven in the other direction): In this case, even if the bogie is stopped,
The body W is rotated in the opposite direction to the above case (Φ).

Note that the above description also applies when a rack bar is used instead of the chain. If this rack bar is always placed in a fixed state (in this case, the traveling of the trolley is a prerequisite for the rotation of the body W), the rack bar may be placed intermittently, or the position of the rack bar may be changed from left to right. By setting it arbitrarily, the body W can be rotated in any direction depending on the traveling position of the trolley, and the rotation of the body W can be stopped at any position.

(Effects of the Invention) As is clear from the above description, the present invention utilizes the application of paint with a thickness exceeding the sag limit and the rotation of the object to be coated to achieve a coating thickness that is higher than that of conventional paints for the same paint thickness. It is also possible to obtain a high-quality painted surface with high smoothness.

In addition, by reversing the rotation of the object to be coated,
It prevents a large amount of paint from concentrating on the corners of the object to be coated, thereby preventing the situation where the coating film becomes extremely thick only at these corners.

[Brief explanation of the drawing]

FIG. 1 is an overall process diagram showing one embodiment of the present invention. FIG. 2 is a diagram showing how the appearance of an automobile body as an object to be coated changes as it rotates. Figures 3 and 4 are graphs showing the relationship between paint thickness and sag, 41 smoothness of the painted surface, and rotation. FIGS. 5 and 6 are perspective views showing examples of jigs used to rotate the body. FIG. 7 is a side view showing an example of a body transport trolley in which the body can be rotated. FIG. 8 is a partially cutaway plan view showing the state below the running path of the bogie. FIG. 9 is a sectional view taken along the line X9-X9 in FIG. FIG. 10 is a side cross-sectional view showing the joint portion between the rotating jig and the truck. FIG. 11 is a sectional view taken along the line X1l-Xll in FIG. 1O. FIG. 12 is a plan view of FIG. 11. FIG. 13 is a sectional view taken along the line X13-X13 in FIG. 10 (7). FIG. 14 is a sectional view taken along the line X14-X14 in FIG. 10. FIG. 15 is a plan view of FIG. 14. P1 to P4: Process W: Body (object to be coated) 9.: Rotation axis D = transportation trolley 1F, IR: Rotation PI tool

Claims (1)

[Claims] (1) In a painting method comprising a painting process of applying paint to an object to be painted and a drying process of drying the paint applied to the object, in the painting process, the paint is coated to a thickness exceeding the sag limit. and in the drying step, the object to be coated is rotated while being inverted around a horizontal axis.