JP2003033690A - Apparatus for discharging suspended coating material mist - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively discharge suspended coating material mist entering and retained in a bag like part in coating in performing mixed flow coating on a material to be coated which has the bag like part. SOLUTION: In the apparatus for discharging coating material mist in the mixed flow coating line for applying a coating material corresponding to each car body K in a coating station, a discharge means for discharging the suspended coating material mist in the bag like parts 11 and 12 of the car body in the coating material mist discharge station to the outside of the station when a coating material specification of a car body at least in the right upstream side is different from that of the car body in coating material mist discharge station is provided in a coating material mist discharge station S2 set in the down stream side of the coating station and the discharge means is provided with an air jetting nozzle 21 for discharging the suspended coating material mist in the bag like part by jetting air toward a window opening part 19 opened to the bag like part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prepares a plurality of different kinds of coating materials, and each of the coating materials having a bag-like portion and coated with any one of the coating materials described above is sequentially flown to a coating line to a coating station. The present invention relates to a floating paint mist discharging device provided in a mixed-flow coating line adapted to apply a paint corresponding to each object to be coated.

[0002]

2. Description of the Related Art For example, in the case of applying a coating to an object whose appearance is particularly important, such as an outer surface of a car body, an intermediate coating and an upper coating are sequentially formed on an undercoat by electrodeposition coating. A plurality of such coatings are used to obtain coating quality with excellent strength and appearance. In particular, a color base coating film is generally formed in the coating film portion of the outermost layer, and the base coating film is covered with a transparent so-called clear coating film.

In recent years, the surface of the article to be coated is less likely to be soiled or the soil can be removed relatively easily.
A low-staining paint has been developed and is being put into practical use. This low-staining paint is roughly classified into a water-repellent paint and a hydrophilic paint. In the case of the water-repellent coating material, for example, a fluorine-based compound is contained as a water-repellent component, and water such as raindrops that has fallen on the surface of the object to be coated becomes substantially spherical on the surface of the water-repellent coating film.

On the other hand, in the case of a hydrophilic coating material, which contains, for example, a silane compound as a hydrophilizing agent, and when rain or the like is about to fall on the surface of the object to be coated, this moisture relatively easily stains and the coating film. During this period, the water that has penetrated into the space and flows off, so that the dirt attached to the surface also flows down. In other words, it is possible to easily wash off stains on the surface of the object to be coated by simply leaving the object to be exposed outdoors on a rainy day, which facilitates maintenance (so-called easy maintenance). can do.

By the way, when coating a mass-produced object to be coated such as an automobile body, a paint corresponding to the object to be coated is prepared, and the object to be coated is sequentially flown to a coating line, It is common to coat the surface of the object to be coated at a coating station provided in the line. Further, as the above-mentioned coating line, there is known a mixed flow coating line in which a plurality of different kinds of coating materials are prepared in a coating station and the coating material to be applied can be changed according to the object to be coated successively flowing through the coating line. It is widely adopted as one that can perform different types of coating on one coating line according to various user preferences.

[0006]

However, in such a mixed-flow coating line, the above-mentioned low-staining paint (for example, hydrophilic paint) and a normal clear paint, or in addition to these, a normal solid paint, etc. When coating a mixture of coating materials to which various kinds of coating materials are applied, if each coating material has a bag-shaped portion, the coating station corresponds to the coating material on the station. When the specific coating material is applied, the coating material mist of the specific coating material may enter the bag-shaped portion and stay as floating coating material mist.

Taking the vehicle body of an automobile as an example, in the case of the vehicle body of an automobile, the engine room, the trunk room, etc. are surrounded by a wall portion except the upper portion covered with a lid member (bonnet or trunk lid). It is shaped like a bag. Further, the vehicle compartment itself surrounded by the roof and the door is also a kind of bag-shaped portion. If such a bag-shaped part is completely closed with a lid member, etc., it may not be possible to fully form a coating film on the part that needs to be coated. It is common to paint in the state. Therefore, it is difficult to prevent the paint mist from entering the bag-shaped portion.

The object to be coated at the coating station has the floating paint mist accumulated in its bag-like portion,
It is sent to the downstream station (setting station) in the coating line, where the coating film is kept in a very wet state for a certain time immediately after coating, so-called setting is performed, and the solvent components on the coating surface and its vicinity are volatilized. To be made. Then sent to the baking station,
Generally, a baking process is performed under a predetermined condition to volatilize the remaining solvent components contained in the paint.

However, if the setting process is performed while the floating paint mist remains in the bag-shaped portion,
The floating paint mist staying in the bag part floats and scatters to the surroundings during this setting process, and adheres to the surface of the object to be coated (where other types of paint are applied) located before and after the setting station. As a result, the coating appearance of the article to be coated located at these front and rear stations is greatly affected.

Regarding the problem of floating paint mist, for example, in Japanese Unexamined Patent Publication No. 10-244220, an organic solvent is sprayed on the coated surface of an object to which spray paint dust (paint mist) adheres to flow the spray paint mist. There is disclosed a coating method for facilitating the application and then performing the top coating.

However, in this method, the number of steps is increased to complicate the coating work, and moreover, the influence of the dispersed organic solvent on the smoothness of the coated surface, especially the portion where the coating mist is not adhered It will be necessary to consider the effect on the paint surface separately.

Further, for example, Japanese Patent Application Laid-Open No. 8-299888 discloses a structure in which an intermediate chamber having a function of removing floating paint mist is provided on the downstream side of a coating booth, and an air curtain is provided between them. Has been done. However, with this configuration, the structure of the coating facility becomes very complicated, and when the object to be coated has a bag-shaped portion capable of containing the paint mist, the paint mist accumulated in the bag-shaped portion Since it may be difficult to remove, it is difficult to completely prevent the paint mist from adhering to the coating surface of the article to be coated, which is located before and after the article to be coated.

Further, for example, in Japanese Unexamined Patent Publication No. 9-314027, an air supply unit is provided at one end of a coating booth and an exhaust unit is provided at the other end, and these air supply and exhaust units are simultaneously driven for coating. A configuration is disclosed in which the floating paint mist is discharged to the outside of the coating booth by supplying and exhausting the air inside the booth. However, even in this configuration, when the object to be coated has a bag-shaped portion, it is difficult to effectively remove and discharge the floating paint mist accumulated in the bag-shaped portion.

Therefore, according to the present invention, when a mixed flow coating is carried out on a coating object having a bag-like portion in a mixed flow coating line by using a plurality of different kinds of paints, a floating stagnant in the bag-like portion during coating is retained. It is intended to provide a floating paint mist discharging device that can effectively discharge paint mist.

[0015]

While the inventors of the present application have been conducting research and development on mixed flow coating using a plurality of different kinds of coating materials, the surface tension and viscosity of the coating material, and further When a certain type of paint is applied due to a difference in the degree of change in surface tension due to baking treatment, and other types of paint mist adhere to the surface of the coated object in a wet state (before baking / drying). It was found that there is a large difference in the influence on the appearance of the surface of the coated object after baking / drying.

That is, on the surface of an object to be coated on which one of the paints whose viscosity or surface force or surface tension change due to baking treatment is relatively small is applied, the paint mist of the other paint whose characteristic values are relatively large is If adhered,
A poor appearance of the surface of the article to be coated after the baking treatment is relatively unlikely to occur. Moreover, even if it occurs, the paint mist adhering portion locally appears as a minute convex defect, and it has been found that repairing is relatively easy by surface polishing.

The floating paint mist discharging device according to the invention of claim 1 of the present application (hereinafter referred to as the first invention) prepares a plurality of different kinds of paints, each of which has a bag-like portion and is coated with one of the above paints. A floating paint mist discharge device provided in a mixed flow coating line in which the coating objects are sequentially flown to the coating line, and the coating material is applied with the coating material according to each coating object. It is installed in the paint mist discharge station for floating paint mist discharge set on the side, and at least when the paint for the object directly upstream is different from the paint applied to the object located at the paint mist discharge station. And a discharge means for discharging the floating paint mist in the bag-shaped part of the coating object located at the paint mist discharge station to the outside of the paint mist discharge station. It is obtained by way.

Further, in the invention according to claim 2 of the present application (hereinafter referred to as the second invention) and the first invention, the discharge means injects air toward an opening portion opened in the bag-shaped portion. The air-injecting means for discharging the floating paint mist in the bag-shaped portion to the outside of the bag-shaped portion by the jet air.

Further, the invention according to claim 3 of the present application (hereinafter,
In a third aspect of the invention, in the first aspect of the invention, the paint mist discharging station is provided with an air supply means for supplying air into the discharging station, and the floating paint mist discharging means is It is characterized in that it is provided with an introducing member which is combined with an opening portion opened to the bag-shaped portion and introduces the air supplied from the air supply means into the bag-shaped portion.

Further, the invention according to claim 4 of the present application
(Hereinafter, referred to as a fourth invention), in the above-mentioned third invention, is provided with a suction-discharging means for sucking the introduction air introduced into the bag-shaped portion by the introduction member and discharging it to the outside of the paint mist discharge station. It is characterized by that.

Further, the invention according to claim 5 of the present application
(Hereinafter, referred to as a fifth invention), in the first invention, the discharging means sucks air from an opening opening in the bag-shaped portion, and the air suction sucks the floating paint mist in the bag-shaped portion. It is characterized in that it is provided with an air suction means for discharging to the outside of the bag portion.

Further, the invention according to claim 6 of the present application
(Hereinafter, referred to as a sixth invention), in any one of the first to fifth inventions, an upstream side and a downstream side of the paint mist discharge station are provided at respective upstream and downstream ends of the paint mist discharge station. The air curtain means for preventing the floating paint mist from scattering to the downstream side and the downstream side is provided.

The invention according to claim 7 of the present application
(Hereinafter, referred to as a seventh invention), in any one of the second to sixth inventions, the object to be coated is a vehicle body of the automobile, and the opening is a window opening of the vehicle body. It is a feature.

The invention according to claim 8 of the present application
(Hereinafter, referred to as an eighth invention) is characterized in that, in any one of the above-mentioned first to seventh inventions, at least one of a viscosity and a surface tension is different from each other in the different paint. It is a thing.

The invention according to claim 9 of the present application
(Hereinafter, referred to as a ninth invention) is characterized in that, in the eighth invention, the heterogeneous coating material contains at least one of a water-repellent coating material and a hydrophilic coating material.

The invention according to claim 10 of the present application
(Hereinafter, referred to as a tenth invention) is the method according to any one of the above-mentioned first to ninth inventions, wherein the coating at the coating station is the maximum of a plurality of coating films to be formed on the surface of each coating object. It is characterized in that it is for the coating film of the outer layer.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the accompanying drawings, for example, in the case of coating a vehicle body of an automobile. Prior to the explanation of the concrete example of the coating line itself, the difference in the surface tension and viscosity of the paint itself, and the degree of change in the surface tension due to the baking treatment after coating, etc., is the wet state (state before baking / drying). The effect on the appearance of the surface of the article to be coated after baking / drying when another type of paint mist adheres to the surface of the article to be coated will be described.

The inventors of the present invention have conducted extensive research and development for reducing the influence on the coating appearance due to the adhesion of different paint mist, and one of the coating materials that has a relatively small change in viscosity or surface force or surface tension due to baking treatment. On the surface of the coated object coated with, when the paint mist of the other paint having these relatively large characteristic values is attached, the appearance of the surface of the coated object after baking is relatively unlikely to occur, and, Even if it occurs, since the paint mist adhering portion locally appears as a minute convex defect, it has been found that repairing is relatively easy by surface polishing.

Incidentally, in this specification, the appearance of the surface of the article to be coated after baking treatment in the case where the paint mist of the other coating material adheres to the surface of the article to be coated with the one coating material as described above. The appearance of defects is referred to as "familiarity" of one paint with the other (paint) mist. If such a poor appearance is relatively unlikely to occur, and even if it occurs, it can be relatively easily repaired, then one paint is “highly compatible” with the other paint mist or “good in familiarity”. , And the opposite case is referred to as "unfamiliar" or "unfamiliar".

Therefore, as described above, one of the paints having a relatively small characteristic value (viscosity or surface force or change in surface tension due to baking) has a mist of the other coating material having a relatively large characteristic value. Can be said to have a high "familiarity" with. However, in the case of the reverse combination, it was found that the appearance of the surface of the article to be coated after the baking treatment was notable, and the defective portion appeared in a concave shape, which made repairing difficult. In other words, it can be said that the other paint having the relatively large characteristic value has a low "familiarity" with the paint mist of the one paint having the relatively small characteristic value.

Therefore, when a mixed flow coating is performed on a mixed flow coating line using a plurality of different kinds of paints, the method of flowing the coated object to the coating line (the order of the coated objects, etc.) is determined by the "familiarity" of the paint mist. It is also possible to reduce the influence of the adhesion of the paint mist on the appearance of the surface of the article to be coated by setting so that the “goodness” and the “badness” (high and low) are properly combined.

First, a method of evaluating "familiarity" (familiarity with different kinds of paint mist) with respect to paint mist of different kinds of paint will be described. In the examination of this evaluation method,
As a paint for forming the outermost layer of a coating film of an object to be coated (automobile body), a so-called monocoat solid type paint (hereinafter referred to as monocoat solid paint), a normal clear paint (hereinafter referred to as current clear paint) , And hydrophilic low-contamination type clear paint (hereinafter referred to as low-contamination type clear paint).

The graph of FIG. 1 is a graph schematically showing how the surface tension of the above-mentioned three kinds of paint changes according to the change of the solid content in the paint. In this graph, curves A, B, and C show the change characteristics of the surface tension of the current clear paint, monocoat solid paint, and low-staining clear paint, respectively.

As can be seen from the graph of FIG. 1,
In the initial state (before being used for coating), the solid content of each coating is about 50% or less, and the solid content is about 65% in the state of being used for coating and forming a coating film on the surface of an object to be coated. Increase to about%. Then, holding in this wet state for a certain period of time, so-called, by setting, by evaporating the solvent component of the coating film surface and its vicinity,
The solids content is increased to over 75%. After that, baking treatment is performed under predetermined conditions to volatilize the remaining solvent components contained in the coating material, whereby the solid content in the coating material reaches approximately 100%, and the required coating film strength can be obtained.

As described above, the surface tension of each paint increases as the proportion of solid content increases. Also,
The difference in surface tension between the paints is also enlarged. The difference in surface tension becomes maximum when the solid content reaches about 100% by the baking process.

An evaluation test was conducted to evaluate the compatibility of the above three kinds of paints with each other's paint mist. In this test, as shown in FIG. 2, a flat plate-shaped test sample P coated with a test target paint and a coating gun G for spraying a different paint different from the test target paint are prepared. Is placed horizontally at a predetermined location,
The nozzle opening Ng of the coating gun G is 1 meter [m] above the test sample P and 1 in the horizontal direction.
[M] It is arranged horizontally so that it is located at a distance.

Then, in the wet state of the coating film of the test sample P, the dissimilar coating material is blown out in the horizontal direction from the nozzle opening Ng, and the spray mist or floating mist at that time is adhered onto the coating film of the test sample P. . Next, the test sample P is held in that state for a certain period of time, so-called setting is performed to volatilize the solvent component on the coating film surface and its vicinity. Then, a baking process is performed under predetermined conditions to volatilize the remaining solvent components contained in the paint.

By carrying out this baking treatment, a certain type of paint is applied to the surface of the test sample in a wet state (the state where the solid content before the baking treatment is relatively low) and another type of paint mist Mi. The effect on the appearance of the surface of the sample due to the adherence of is markedly shown (see FIG. 3).

The appearance of the coating film surface of this test sample P was visually evaluated by classifying it into 5 grades from "evaluation 5" to "evaluation 1". In this evaluation, the number and size of defects on the surface of the coating film due to the adhesion of different paint mist are visually determined. "Evaluation 1" indicates a case where the appearance is remarkably deteriorated, and "Evaluation 5" indicates the appearance. The case where the deterioration of the property is hardly recognized at least visually is shown. In addition to such a five-level evaluation, the type of appearance defect (defect pattern on the coating film surface) was confirmed and recorded. That is, the case where the defect pattern on the surface of the coating film was concave and the case where it was convex was visually and visually discriminated.

When the defect pattern on the surface of the coating film is convex, the local convex portion can be relatively easily repaired by polishing and removing the local convex portion with, for example, sandpaper or compound. It can be said that the degree of failure is comparatively light even if the evaluation by the five-level evaluation is the same. However, when the defect pattern on the surface of the coating film is concave, in order to repair it, for example, as shown by a broken line curve in FIG. 4B described later, the entire defect from the deepest part of the concave defect is included. Since it is required to polish the slope as gently as possible and so as to be smoothly connected to the surrounding surface area, it is necessary to polish over a wide range for each defect point. Even so, it is generally difficult to obtain a good surface condition, so
Even if the five-level evaluation is the same, the degree of failure is heavy.

The evaluation test as described above was carried out by changing the combination of paints. The test results are shown in Table 1.

[Table 1]

As can be seen from the test results in Table 1, the "familiarity" of different paints to different paint mist (familiarity of different paint mist) greatly differs depending on the combination of paints. That is, the surface tension of the paint itself is the lowest,
In addition, in the case of low-contamination type clear paint, which has the smallest degree of change in surface tension due to baking treatment after painting, the appearance of the paint film surface will remain even if the paint mist of the current clear paint or mono-coat solid paint adheres. "Evaluation 5",
Almost no deterioration in appearance was observed. That is, it can be said that the low-staining type clear coating material has a very high "familiarity" with respect to both types of mist of different kinds of coating materials.

On the other hand, in the case of the current clear paint, in which the surface tension of the paint itself is the highest and the degree of change in the surface tension due to the baking treatment after the paint is the highest, the difference between these two characteristics is relatively small. Although the appearance of the coating film is relatively poor (“evaluation 4”) for the solid mist paint mist, for the low-contamination paint mist that has a large difference between the above properties, , The appearance of the coating film surface is significantly deteriorated (less than "Evaluation 1").

In addition, in both combinations, the defect pattern on the surface of the coating film has a concave shape which is difficult to repair. In particular, for paint mist of low-staining paint, the appearance of the coating film is remarkably deteriorated and the defect pattern becomes a concave shape that is difficult to repair. The "sex" was found to be very low.

In the conventional coating process, it is often the case that the paint mist of the current clear paint adheres to the coating film surface of the monocoat solid paint, but in this case,
The defect pattern is convex, and the appearance evaluation of the coating film surface is "Evaluation 3". Therefore, the appearance evaluation is required to be at least “evaluation 3” or more. Further, in the case of the monocoat solid paint, the appearance evaluation of the low-staining clear paint with respect to the paint mist was "Evaluation 4", and the defect pattern was convex.

From the above, a certain type of coating material is applied and is in a wet state (state before baking / drying) depending on the difference in the surface tension of the coating material itself or the degree of change in surface tension due to baking treatment after coating. It has been found that when another type of paint mist adheres to the surface of the article to be coated, there is a large difference in the effect on the appearance of the surface of the article to be coated after baking / drying. It is considered that this is true not only of the characteristic of surface tension but also of the viscosity of the coating material.

That is, the surface of an object coated with a paint (for example, a low-staining paint) having a relatively small change in viscosity or surface tension or surface tension due to baking treatment,
When the paint mist of another paint having these relatively large characteristic values adheres, the appearance defect on the surface of the article to be coated after the baking treatment is relatively unlikely to occur. Also, even if it occurs,
Since the portion where the paint mist adheres appears locally as a minute convex defect, it is relatively easy to repair by surface polishing. In short, in this case, the "familiarity" with the different paint mist is relatively good.

On the other hand, in the case opposite to the above, in general, the compatibility of different types of paint mist becomes poor, and in particular, when there is a large difference in the above respective characteristics, for example, with respect to the low stain type clear paint mist of the current clear paint. As in the case, the deterioration of the appearance evaluation is remarkable, and the defect pattern also has a concave shape that is difficult to repair, and the deterioration of the familiarity with the different paint mist becomes very remarkable.

As described above, in a combination of a paint having a large change in viscosity or surface tension or surface tension due to baking treatment (for example, a current clear paint) and a paint mist of another paint having small characteristic values, It was found that the defect pattern was concave when the difference in the characteristic values was large to some extent or more.

This is, for example, as schematically shown in FIG. 4 (a), the coating film F1 in a wet state (that is, a state containing a solvent) of a coating material having a relatively high surface tension (or viscosity).
When the paint mist M1 of the paint having a low surface tension adheres to the upper part in the same wet state, the paint mist M1 itself has a low surface tension and therefore tries to enter the coating film F1 relatively easily. Has a high surface tension, so that it will swell around the dissimilar paint mist M1 trying to get into the coating film. Then, a baking process is performed in this state, and the coating film F1 and the solvent component M of the dissimilar paint mist M1.
It is considered that if 1 s is volatilized, it will remain as a concave defect D1 on the surface of the coating film F1 as schematically shown in FIG. 4 (b).

On the other hand, in the case of the reverse combination, as shown schematically in FIG. 4 (c), the surface tension of the dissimilar paint mist M2 itself is high, so that it becomes granular on the surface of the coating film F2 and is coated. It is difficult to enter the film F2, and since the surface tension is low on the side of the coating film F2, swelling around the mist M2 is unlikely to occur. Therefore, even if the baking treatment is performed in this state and the solvent component M2s is volatilized, a concave defect pattern is unlikely to occur on the coating film surface, and as shown in FIG. 4D, rather, a convex defect on the coating film surface is generated. It is considered to remain as D2.

When the coating film and the paint mist are in a wet state, the mutual solvent components are present, so that the difference in surface tension between the two is relaxed and apparently reduced.
The difference in surface tension increases as the volatilization of the solvent component progresses by the baking treatment, and at the time when the baking treatment is completed, the coating film surface is cured with unevenness.

Therefore, when mixed flow coating is performed on a mixed flow coating line using a plurality of different kinds of paints, the method of flowing the coated objects to the coating line (the order of the coated objects, etc.) is "familiar to each other". When the “goodness” and the “badness” (high and low) are properly combined, the influence of the adhesion of the paint mist on the appearance of the surface of the article to be coated is reduced.

Next, a specific example of mixed flow coating using a plurality of different kinds of paints in the mixed flow coating line for automobile bodies according to the present embodiment will be described. FIG. 5 is a block explanatory diagram showing an outline of a portion including a coating station for the outermost layer and a station on the downstream side of the coating line according to the present embodiment. As shown in the figure, the coating line Lp is provided with a coating station S1 for coating the outermost layer for forming the outermost layer portion of the coating film on the vehicle body surface. The outermost layer coating station S1 includes a base coat applying section S1a for applying a base coat such as a so-called color base, and a clear coat applying section S1b for forming a final coat such as a so-called clear coat on the base coat.

In the present embodiment, the downstream side of the coating station S1 (that is, the clear coat applying section S1b).
A paint mist discharging station S2 for discharging a floating paint mist, which will be described in detail later, is set on the downstream side of FIG. The paint mist discharging station S2 and the coating station S1 are more preferably one booth B.
Located in Т. The booth BТ will be described later.

On the downstream side of the paint mist discharge station S2, there is provided a setting station S3 for performing so-called setting, which holds the vehicle body for a certain period of time with a coating film very wet immediately after coating. There is. Further, on the downstream side of the setting station S3, a baking station S4 for performing a baking process under a predetermined condition is provided.

The outermost coating film of the vehicle body sent from the paint mist discharge station S2 is volatilized by the setting at the setting station S3 so that the solvent components on the coating film surface and in the vicinity thereof are volatilized, and then at the baking station. The remaining solvent component contained in the paint is volatilized by the baking treatment of.

FIG. 6 is an explanatory view schematically showing an outline of the booth BT and each station located inside thereof. As shown in this figure, the booth BТ is of a so-called push-pull type, and an air blower 2 as an air supply means for supplying air (so-called push air Ap) into the booth BТ is provided on the upper side of the booth. At the same time, on the lower side of the booth, an air suction / discharging device 4 for sucking the air in the booth BТ as so-called pull air Aq and discharging it is arranged.

By operating both the air blower 2 and the air suction / exhaust device 4 in one direction in the booth BT (in the example of FIG. 6, from the upper part to the lower part of the booth).
It is possible to generate an air flow, and to volatilize the solvent volatile components of the paint used for coating and the floating paint mist outside the vehicle body K that has been generated at the time of coating, suck it as pull air Aq on the air flow, and discharge it outside the booth BT. .

The car body K of the automobile to be painted is transported in one direction while being mounted on the transport carriage E.
In the example of FIG. 6, the sheet is conveyed from right to left as indicated by the white arrow. Coating machines 5 and 6 are provided in the base coat application section S1a and the clear coat application section S1b of the coating station S1, respectively.
On the vehicle body K located at 1b, a predetermined coating material is sprayed from a coating gun (not shown) provided in each coating machine 5, 6 to apply the coating material.

Incidentally, in each vehicle body K, as shown in detail in FIG. 7, for example, the trunk room 12 is formed in a bag shape in which the periphery is surrounded by walls except for the upper part covered with the lid member (trunk lid 18). , The roof 15 and the doors 16 and 17
The vehicle interior 11 itself, which is surrounded by etc., also constitutes a kind of bag-shaped portion. When the bag-shaped parts such as the trunk room 12 and the vehicle compartment 11 are completely closed by the lid member (the trunk lid 18 and the doors 16 and 17) and the like, the coating is sufficiently performed at the place where the coating is required. Since there may be a case where a portion where the trunk lid 18 and the rear door 17 are not completely formed, as shown in FIG. 7, the painting is performed in a state where the trunk lid 18 and the rear door 17 are slightly opened. .
In the vehicle body K according to the present embodiment, the vehicle compartment 11 and the trunk room 12 are not shielded at least at this point.

Therefore, the bag-like portion (trunk room 12
As for the passenger compartment 11), the window glass is not yet fitted in the window portion at this point, so the paint is unavoidably applied not only from the passenger compartment 11 side where the front and side windows are opened but also from the trunk room 12 side. The mist will invade.

The coating devices provided in the base coat applying section S1a and the clear coat applying section S1b respectively,
Although not specifically shown, the above-described coating guns provided in the coating machines 5 and 6 and a plurality of paint tanks for respectively storing different kinds of paints, and each of these paint tanks and It is equipped with a control valve device (so-called color change valve) arranged between the painting guns, and between these elements, a paint supply pipe for supplying paint from the paint tank to the painting gun and from the painting gun to the paint tank. It is configured by connecting with a paint return pipe or the like for returning excess paint.

A paint feed pump for sucking up the paint in the tank and feeding it to the downstream side of the paint feed pipe is provided in the middle of the paint feed pipe connected to each paint tank. Oil. Further, the color change valve is capable of switching control of the fluid supply path inside the valve, and by performing such switching control, the desired paint tank and the coating gun are connected to supply the desired coating material to the coating gun. can do. In this case, the coating gun is washed with a solvent such as thinner each time the coating material is changed. Since the overall structure of each of the above-mentioned coating devices and each of its constituent elements (coating gun, coating machine, color change valve, paint tank, etc.) are the same as those conventionally known, a detailed description of the structure and Illustration is omitted.

In the coating station S1, the above-mentioned paint tanks are arranged according to the type of paint so that mixed flow coating using a plurality of different kinds of paints can be carried out for each of the base coat applying section S1a and the clear coat applying section S1b. Multiple units are provided. In the present embodiment, for example, for the clear coat application section S1b, the paint tanks for the current clear paint and the low-contamination type clear paint, and more preferably, in addition to these, the paint tanks for the monocoat solid paint There are 3 types of paint tanks. Then, the color change valve is controlled to be switched according to the coating specification of the vehicle body K carried into the clear coat application section S1b, and the connection state between the paint tank and the coating gun is switched to perform coating. There is.

As described above, in the present embodiment, the paint mist discharging station S2 for discharging the floating paint mist is provided on the downstream side of the coating station S1 (that is, the downstream side of the clear coat applying section S1b). There is. The paint mist discharging station S2 is more preferably arranged inside the booth BT. As shown in detail in FIG. 8, in the paint mist discharge station S2,
Floating paint mist in the bag-shaped parts of the vehicle interior 11 and the trunk room 12 of the vehicle body K located at the paint mist discharge station S2 is discharged and removed from the bag-shaped parts 11, 12 to the outside of the paint mist discharge station S2. An air injection nozzle 21 is provided for discharging.

The air injection nozzle 21 is capable of injecting air toward the front window opening 19 which is an opening of the bag-like portion of the vehicle body K located in the paint mist discharging station S2, for example, opening into the vehicle compartment 11. Is set to a relative position and orientation (azimuth) with respect to the vehicle body K, and the vehicle body K can be moved in synchronization with the downstream movement of the vehicle body K in the paint mist discharge station S2. Attached). The position and orientation (azimuth) of the air injection nozzle 21 may be set so as to inject air toward the side window opening of the vehicle body K.

When the vehicle body K reaches the downstream end of the paint mist discharge station S2, the synchronous moving mechanism reversely moves the air injection nozzle 21 in order to discharge and remove the paint mist of the next vehicle body K. , The paint mist discharging station S2 is located at a predetermined portion of the upstream side portion. Since the synchronous movement mechanism is the same as a conventionally known mechanism, detailed illustration and description of its structure are omitted.

The air injection nozzle 21 and its synchronous movement mechanism include a transfer mechanism (not shown) for the vehicle body K on the coating line Lp, a coating device including the coating machines 5 and 6 at the coating station S1, a blower device 2 at the booth BT, and Air suction and discharge device 4
Etc., and is connected to a control panel (not shown) of the coating line Lp so that signals can be exchanged. In the present embodiment, at least the paint applied to the vehicle body K located in the clear coat application section S1b on the upstream side is applied to the air body injection nozzle 21 applied to the vehicle body K located in the paint mist discharge station S2. Is controlled to perform an air injection operation at different times.

As described above, since the air jet nozzle 21 is provided in the paint mist discharge station S2, the air having a predetermined pressure is jetted from the air jet nozzle 21, so that the air blows into the bag shape. Department (cabin 1
1 and the floating paint mist accumulated in the trunk room 12) can be discharged to the outside of the bag-shaped parts 11 and 12.
At this time, the floating paint mist in the bag-shaped portions 11 and 12 is discharged to the outside of the bag-shaped portions 11 and 12 mainly from the slightly opened portions of the rear door 17 and the trunk lid 18 by the jet air.

In FIG. 8, the discharge path of the air containing the floating paint mist discharged from inside the bag-shaped portions 11 and 12 is
It is shown by an arrow hatched with diagonal lines (the same applies to FIGS. 9 and 12 described later). As described above, the vehicle compartment 11 and the trunk room 12 are not shielded at least at this point, and the floating paint mist accumulated in the trunk room 12 is easily externalized by the air blown from the front side of the vehicle room 11. Is discharged.

The paint mist discharge station S2 is
As described above, it is provided in the so-called push-pull type booth BT, and the so-called push air A
p is supplied, and this is sucked downward by the air suction / discharge device 4 as so-called pull air Aq and discharged to the outside. Therefore, the bag-shaped portion (vehicle compartment 11 and trunk room 12) is blown by the air blown from the air jet nozzle 21
The floating paint mist discharged / removed from the inside becomes a one-way (direction from the upper part of the booth to the lower part) air flow generated in the booth BТ by operating both the blower device 2 and the air suction / discharge device 4. The air is sucked by the air suction / discharge device 4 as pull air Aq and discharged to the outside of the booth BT.

Further, the paint mist discharging station S
Air curtains 7A and 8A for preventing the floating paint mist from scattering from the paint mist discharging station S2 to the upstream side and the downstream side are provided at the respective ends of the upstream side and the downstream side of 2. In order to form the air curtains 7A and 8A, air supply devices 7 and 8 for air curtains are installed above the upstream end and the downstream end of the paint mist discharging station S2.

As described above, the paint mist discharging station S2 for discharging the floating paint mist is set on the downstream side of the coating station S1 in which the mixed flow coating is performed (that is, the downstream side of the clear coat applying section S1b). Since S2 is provided in the so-called push-pull type booth BT and is equipped with the air injection nozzle 21, the bag-shaped portion (vehicle compartment 11 Also, the floating paint mist in the trunk room 12) can be discharged and removed from the bag-shaped portions 11 and 12, and the paint mist can be discharged to the outside of the paint mist discharging station S2.

Therefore, the paint for the vehicle body K located at the paint mist discharge station S2 and the vehicle body K located at the station (clear coat coating section S1b and / or setting station S3) immediately upstream and / or downstream thereof. When the paint is different from the above paint, the floating paint mist staying in the bag-shaped portions 11 and 12 of the vehicle body K located at the paint mist discharge station S2 is the upstream and / or downstream station S1b and It is possible to prevent the adhesion to the surface of the vehicle body located at S / 3 and adversely affecting the coating appearance.

In particular, the air jet nozzle 21 for discharging the floating paint mist has at least the vehicle body K located at the immediately upstream station (clear coat application section S1b) for the vehicle body K located at the paint mist discharge station S2. When the paint applied to the paint mist is different from that applied to the paint mist discharge station S2, the floating paint mist in the bag-shaped portion (vehicle compartment 11 and trunk room 12) of the vehicle body K located at the paint mist discharge station S2 is discharged to the outside of the paint mist discharge station S2. Therefore, it is possible to efficiently and reliably prevent the floating paint mist from adversely affecting the coating appearance of the vehicle body K on the immediately upstream side.

Further, in order to discharge and remove the floating paint mist from the bag-shaped portions (vehicle compartment 11 and trunk room 12) of the vehicle body K, openings (eg, front window openings) opened in the bag-shaped portions 11 and 12. 19) is provided with an air injection nozzle 21 for injecting air toward the bag-shaped portion 1 with a relatively simple structure and reliably by the above-mentioned injection air.
The floating paint mist in 1 and 12 can be discharged to the outside of the bag portion.

Further, the paint mist discharging station S
Since the air curtains 7A and 8A for preventing the floating paint mist from scattering from the paint mist discharging station S2 to the upstream side and the downstream side are provided at the respective ends on the upstream side and the downstream side of the paint 2, Mist discharge station S
The floating paint mist staying in the bag-shaped portions 11 and 12 of the vehicle body K located at No. 2 is located at the upstream side stations S1b and / or
Alternatively, it can be more reliably prevented with a relatively simple structure from being attached to the surface of the vehicle body K located at the downstream station S3 and adversely affecting the coating appearance.

As described above, the bag-shaped portion 11 of the vehicle body K,
Instead of painting the vehicle body K with the lid members 16, 17, 18 of 12 being slightly opened, painting is performed with these bodies substantially closed, and the vehicle body K is carried into the paint mist discharge station S2. When it comes, the bag-shaped parts 11, 12
The lid members 16, 17, and 18 may be opened a little. Further, even when the coating is performed with the lid members 16, 17, and 18 being slightly opened, the vehicle body K may be opened further when it is brought into the paint mist discharge station S2. This is because the larger the opening amount of the lid members 16, 17, 18 is, the greater the effect of ejecting the floating paint mist from the air ejecting nozzles 21 when ejecting the floating paint mist from inside the bag-shaped portions 11, 12.

In the above-described embodiment (hereinafter, referred to as the first embodiment), the air is used in order to discharge and remove the floating paint mist from the inside of the bag-shaped portion (vehicle compartment 11 and trunk room 12) of the vehicle body K. Although the injection nozzle 21 is used, it is also possible to use an existing air facility instead of this to perform the same operation. Next, the second aspect of the present invention
The embodiment will be described. In the following description, components having the same configurations as those in the case of the above-described first embodiment and having the same functions are designated by the same reference numerals, and further description will be omitted.

FIG. 9 is an enlarged schematic view showing the schematic structure of the paint mist discharging station S102 according to the second embodiment, and is a front explanatory view corresponding to FIG. 8 in the first embodiment. is there. As shown in this figure, in the present embodiment, for example, a wind guide plate 22 is arranged in the window opening 16d of the front door 16 of the vehicle body K.

As shown in detail in FIGS. 10 and 11, the baffle plate 22 has a slanted portion 22a having a predetermined area which is slanted at a predetermined angle with respect to the vertical direction in the mounted state, and an inner edge portion of the slanted portion 22a. A horizontally extending guide portion 22b having a predetermined width,
The guide portion 22b includes an attachment portion 22c extending downward from the inner edge portion thereof at a substantially right angle. On the other hand, at the upper edge of the door body 16a of the rear door 16, an insertion groove 16c into which a window glass (not shown) is vertically slidably inserted into the door space 16b when the vehicle is completely assembled is formed.

The baffle plate 22 is locked to the door body 16a of the rear door 16 by inserting the mounting portion 22c into the insertion groove 16c at the upper edge of the door body 16a,
In the locked state, the upper edge of the door body 16a and the door sash 1
It is arranged in the window opening 16d formed by 6e. The baffle plate 22 corresponds to the "introducing member" described in the claims of the present application.

From the air blower 2 arranged above the paint mist discharging station S102, the discharging station S1
The air (so-called push air Ap) supplied in 02 is
As shown in FIG. 11, after hitting the inclined portion 22a of the baffle plate 22 from above, the inclined portion 22a and the guide portion 22b connected to the inclined portion 22a are guided into the vehicle interior 11. By the push air Ap introduced from the window opening 16d by the baffle plate 22 in this manner, the floating paint mist staying in the bag-shaped portions (the vehicle compartment 11 and the trunk room 12) of the vehicle body K is caused. It is discharged and removed from 11 and 12.

The floating paint mist discharged / removed from the bag-shaped portions 11 and 12 is operated by operating both the air blower 2 and the air suction / discharger 4 to booth B.
The air flow in one direction (in the direction from the upper part of the booth to the lower part) generated in T is sucked as pull air Aq by the air suction / discharge device 4 and discharged to the outside of the booth BT. Also in the present embodiment, the air for preventing the floating paint mist from scattering from the paint mist discharge station S2 to the upstream side and the downstream side is provided at each of the upstream and downstream ends of the paint mist discharge station S102. Curtains 7A and 8A are provided.

As described above, according to the present embodiment, the bag-shaped portion of the vehicle body K (the passenger compartment 11 and the trunk room 1).
2) Window opening 16e of the rear door 16 that opens in 2)
Since the air guide plate 22 for introducing the push air Ap from the air blower 2 into the bag-shaped portions 11 and 12 is provided in combination with the air blower 2, the existing air supply means (the air blower 2 in the booth BТ).
By using the air supplied from, it is possible to achieve the same effect as in the first embodiment with a simpler configuration.

In particular, the introduced air introduced into the bag-shaped portions 11 and 12 by the baffle plate 22 is sucked by the air sucking / discharging device 4 of the booth BТ, and the paint mist discharging station S
Since it is discharged to the outside of the body 102,
The floating paint mist in 12 can be discharged to the outside of the paint mist discharge station S102 more reliably.

In the second embodiment, the means (baffle plate 22) for discharging and removing the floating paint mist from the bag-shaped portions 11 and 12 of the vehicle body K is locked to the vehicle body K. Move with K. Therefore, unlike the case of the first embodiment, it is not necessary to provide a synchronous movement mechanism for synchronizing the above-mentioned means (the air injection nozzle 21) with the movement operation of the vehicle body K, and the same effect can be obtained with a simpler configuration. be able to.

Next, a third embodiment of the present invention will be described. As shown in FIG. 12, in the paint mist discharging station S202 according to the third embodiment, the vehicle interior 1 of the vehicle body K located at the paint mist discharging station S202.
An air suction duct 23 is provided in order to discharge and remove the floating paint mist in the bag-shaped portions such as 1 and the trunk room 12 from the bag-shaped portions 11 and 12, and further to the outside of the paint mist discharging station S2. Although not specifically shown, the air suction duct 23 is connected to a discharge duct that guides the sucked air to the outside of the paint mist discharge station S202 and discharges it.

The air suction duct 23 is capable of sucking air from the front window opening 19 which is an opening opening to the passenger compartment 11 of the bag-like portion of the vehicle body K located at the paint mist discharge station S202. In the first embodiment, the relative position and attitude (azimuth) with respect to the vehicle body K are set, and the vehicle body K can be moved in synchronization with the movement of the vehicle body K to the downstream side in the paint mist discharge station S2. It is attached to a synchronous movement mechanism (not shown) similar to the case. The position and orientation (azimuth) of the air suction duct 23 may be set so that air can be sucked from the side window opening of the vehicle body K.

The air suction duct 23 and its synchronous movement mechanism are connected to a control panel (not shown) of the coating line Lp so that signals can be exchanged. In the present embodiment, in the air suction duct 23, at least the paint applied to the vehicle body K located in the clear coat application section S1b on the upstream side is applied to the vehicle body K located in the paint mist discharge station S2. Are controlled to perform the air suction operation at different times.

In the case of the paint mist discharging station S202 according to this embodiment, at least a blower device for supplying push air is not provided in order to prevent the suction by the air suction duct 23 from being hindered.
An air curtain similar to that in each of the above-described embodiments may be provided at each of the upstream and downstream ends of the paint mist discharging station S202.

As described above, according to the present embodiment, air is sucked from the front window opening 19 that opens in the bag-shaped portions 11 and 12 of the vehicle body K, and the bag-shaped portion 11 is sucked by this air suction. Since the air suction duct 23 for discharging the floating paint mist in the inside of the bag 12, 11 to the outside of the bag-like portions 11 and 12 is provided, the structure similar to that in the first embodiment can be achieved with a relatively simple structure and reliably. It is possible to exert an effect. That is, when mixed flow coating is performed on the vehicle body K having the bag-shaped portions 11 and 12, the floating paint mist that has entered and accumulated in the bag-shaped portions 11 and 12 at the time of coating can be effectively discharged.

In the mixed flow coating line Lp as described above, the clear coat coating section S of the coating station S1 is used.
There are three types of vehicle bodies: a vehicle body K that uses the current clear paint to form the outermost coating in 1b, a vehicle body K that uses the monocoat solid paint, and a vehicle body K that uses low-pollution clear paint. In the case of completely random coating order, unless the floating paint mist accumulated in the bag-shaped portions 11 and 12 of the vehicle body K is sufficiently discharged and removed, from the above-mentioned evaluation test results (see Table 1), After going through the baking process,
Some coating film properties of the outermost layer cause poor appearance.

That is, for example, the body K of the coating specification using the mono-coat solid paint is flown before and after the body K of the coating specification using the current clear paint for forming the outermost coating film,
Bag-shaped part 1 of the body K of the painting specification using the current clear paint
When the floating clear paint mist of the current clear paint staying in No. 1 and No. 12 is scattered and adheres to the coating film of the mono-coat solid paint, the outermost coating appearance is "Evaluation 3" and the defect pattern is convex (" Convex 3 "). On the other hand, the vehicle body K of the painting specification using the current clear paint is washed before and after the vehicle body K of the painting specification using the low pollution type clear paint for the outermost layer coating film formation.
If the floating paint mist of the low-contamination-type clear paint that has accumulated in the bag-shaped parts 11 and 12 of the vehicle body K that uses the low-contamination-type clear paint is scattered and adheres to the coating film of the current clear-paint,
The coating appearance of the outermost layer is less than "evaluation 1" and the defect pattern is concave ("<concave 1").

Therefore, particularly in the latter case, in the coating station S1 (that is, in the clear coat applying section S1b).
The paint mist discharge station S set on the downstream side and on the upstream side of the setting station S3.
2, it is particularly important to discharge and remove the floating paint mist accumulated in the bag-shaped portions 11 and 12 of the vehicle body K to the outside of the station in order to prevent the appearance of the outermost layer coating film from being defective. is there.

In the above embodiment, the mixed flow coating on the car body of an automobile is taken as an example, but the present invention is not limited to such a case, and the coating having the bag-shaped portion is applied. It can be effectively applied to other various mixed-flow coatings using different kinds of paints for objects. As described above, it is needless to say that the present invention is not limited to the above embodiments, and various improvements and design changes can be made without departing from the gist of the present invention.

[0098]

According to the first aspect of the present invention, a paint mist discharging station for discharging floating paint mist is set on the downstream side of the coating station of the mixed flow coating line, and the discharging means for discharging the floating paint mist is provided in this discharging station. Since it is provided, the floating paint mist in the bag-shaped part of the object to be coated, which was difficult to be discharged in the past, is discharged and removed from the bag-shaped part, and the paint mist is discharged to the outside of the paint mist discharging station. can do. Therefore, if the paint for the object to be coated located at the paint mist discharge station and the paint for the object at the station immediately upstream and / or immediately downstream of the paint mist discharge station are different, the paint mist discharge station The floating paint mist staying in the bag-shaped portion of the object to be coated located on the upstream side and / or
Alternatively, it can be prevented from adhering to the surface of the article to be coated located at the station on the downstream side and adversely affecting the coating appearance. In particular, the floating paint mist discharging device is located at the paint mist discharging station at least when the paint for the object directly upstream is different from the paint applied to the object located at the paint mist discharging station. Since the discharging means for discharging the floating paint mist in the bag-shaped portion of the coated object to the outside of the paint mist discharging station is provided, the floating paint mist may adversely affect the coating appearance of the coated object on the upstream side. Can be efficiently and surely prevented.

According to the second invention of the present application, basically, the same effect as that of the first invention can be obtained. In particular, the discharging means is provided with an air injecting means for injecting air toward the opening portion opening in the bag-shaped portion and discharging the floating paint mist in the bag-shaped portion to the outside of the bag-shaped portion by the jet air. Since it has a relatively simple structure,
The same effect as that of the first invention can be obtained.

Further, according to the third invention of the present application, basically the same effect as that of the first invention can be obtained. In particular, the paint mist discharge station is provided with an air supply means for supplying air into the discharge station, and the floating paint mist discharge means is combined with an opening opening in the bag-shaped portion to form Since the introduction member for introducing the supply air from the air supply unit is provided in the bag-shaped portion, the supply air from the existing air supply unit is used, and the same effect as that of the first invention is obtained with a simpler configuration. Can be played.

Furthermore, according to the fourth invention of the present application, basically the same effect as that of the third invention can be obtained. In particular, since the suction member is provided for sucking the introduction air introduced into the bag-shaped portion by the introduction member and discharging it to the outside of the paint mist discharging station, the floating paint mist in the bag-shaped portion can be more reliably coated. It can be discharged to the outside of the mist discharge station.

Furthermore, according to the fifth invention of the present application, basically the same effect as that of the first invention can be obtained. In particular, since the discharging means includes air suction means for sucking air from the opening opening in the bag-shaped portion and discharging the floating paint mist in the bag-shaped portion to the outside of the bag-shaped portion by this air suction. The effects similar to those of the first aspect of the present invention can be reliably achieved with a relatively simple configuration.

Furthermore, according to the sixth invention of the present application, basically the same effect as any one of the above-mentioned first to fifth inventions can be obtained. In particular, air curtain means for preventing the floating paint mist from scattering from the paint mist discharge station to the upstream side and the downstream side is provided at each of the upstream and downstream ends of the paint mist discharge station. The floating paint mist staying in the bag-shaped part of the object to be coated located at the paint mist discharge station adheres to the surface of the object to be coated located at the above-mentioned upstream and / or downstream station, and its coating appearance Can be more surely prevented with a relatively simple configuration.

Furthermore, according to the seventh invention of the present application, particularly when performing mixed flow coating on the vehicle body of an automobile, the window opening is utilized to basically perform any one of the second to sixth inventions. The same effect as can be obtained.

Furthermore, according to the eighth invention of the present application, basically, the same effect as any one of the above-mentioned first to seventh inventions can be obtained. In particular, since the above-mentioned different paints are different from each other in at least one of viscosity and surface tension, when performing mixed flow coating using different paints having different characteristics, deterioration of appearance due to adhesion of different paints mist may occur. It can be effectively suppressed.

Furthermore, according to the ninth invention of the present application, basically, the same effect as that of the eighth invention can be obtained. In particular, since the different type of paint contains at least one of a water-repellent paint and a hydrophilic paint,
Water-repellent or hydrophilic, so-called, which makes it difficult for dirt to adhere to the surface of the coated object or makes it possible to remove dirt relatively easily
When mixed flow coating is performed using a dissimilar coating material containing a low-staining coating material, it is possible to effectively suppress deterioration in appearance due to adhesion of the dissimilar coating material mist.

Further, according to the tenth invention of the present application, basically, the same effect as that of any one of the above-mentioned first to ninth inventions can be obtained. In particular, the coating at the coating station is for the outermost coating film among the coating films of the multiple layers to be formed on each surface of the article to be coated, so for the coating of the outermost layer where the appearance is most important, It is possible to effectively suppress the deterioration of the external appearance due to the adhesion of different paint mist.

[Brief description of drawings]

FIG. 1 is a graph schematically showing a change characteristic of surface tension with respect to a solid content ratio of three kinds of coating materials according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an evaluation test method of familiarity with different paint mist.

FIG. 3 is a front explanatory view of a test sample of a familiarity evaluation test with respect to the different paint mist.

FIG. 4 is a cross-sectional explanatory view schematically showing a defect pattern due to a different-type paint mist.

FIG. 5 is a block diagram showing an outline of a portion including a coating station for the outermost layer and a station on the downstream side of the coating line according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram schematically showing an outline of a booth provided in the coating line and each station located inside the booth.

FIG. 7 is an enlarged front view schematically showing a vehicle body carried into the booth.

FIG. 8 is a front explanatory view schematically showing an enlarged schematic configuration of a paint mist discharge station provided in the coating line.

FIG. 9 is a front explanatory view schematically showing an enlarged schematic configuration of a paint mist discharging station according to a second embodiment of the present invention.

FIG. 10 is a front explanatory view showing a vehicle door and a baffle plate located at a paint mist discharging station according to the second embodiment.

FIG. 11 is a view showing a mounting structure of the baffle plate shown in FIG.
FIG. 7 is a cross-sectional explanatory view taken along line Y11-Y11 of FIG.

FIG. 12 is a front explanatory view schematically showing a schematic configuration of a vehicle body and a suction device located at a paint mist discharge station according to a third embodiment of the present invention.

[Explanation of symbols]

2 ... Blower 4 ... Air suction / discharging device 5, 6 ... Coating machines 7A, 8A ... Air curtain 11 ... Vehicle compartment 12 ... Trunk room 19 ... Front window opening 21 ... Air injection nozzle 22 ... Baffle plate 23 ... Air suction duct K ... Vehicle body Lp ... Painting line S1 ... Painting station S2, S102, S202 ... Paint mist discharge station

Claims (10)

[Claims] 1. A plurality of different kinds of coating materials are prepared, and coating objects each having a bag-like portion and coated with one of the coating materials are sequentially flown to a coating line, and the coating station is adapted to each coating material. A floating paint mist discharge device provided in a mixed-flow coating line for applying paint respectively, which is provided at a paint mist discharge station for discharging floating paint mist set on the downstream side of the above-mentioned coating station, and at least When the paint for the object to be coated on the upstream side is different from the paint applied to the object to be coated located at the paint mist discharging station, the floating paint mist in the bag-shaped portion of the object to be positioned at the paint mist discharging station is removed. A floating paint mist discharging device comprising discharge means for discharging the paint mist discharging station to the outside. 2. The air ejecting means for ejecting air toward an opening opening in the bag-shaped portion, and ejecting the floating paint mist in the bag-shaped portion outside the bag-shaped portion by the ejected air. The floating paint mist discharging device according to claim 1, further comprising: 3. The paint mist discharge station comprises:
Air supply means for supplying air is provided in the discharge station, and the floating paint mist discharge means is combined with an opening opening to the bag-shaped portion to supply the air supplied from the air supply means in a bag-like shape. The floating paint mist discharging device according to claim 1, further comprising an introducing member that is introduced into the portion. 4. The floating apparatus according to claim 3, further comprising suction and discharge means for sucking the introduction air introduced into the bag-shaped portion by the introduction member and discharging the introduction air to the outside of the paint mist discharge station. Paint mist discharge device. 5. The discharge means includes air suction means for sucking air from an opening opening in the bag-shaped portion and discharging the floating paint mist in the bag-shaped portion to the outside of the bag-shaped portion by the air suction. The floating paint mist discharging device according to claim 1, wherein: 6. Air curtain means for preventing the floating paint mist from scattering from the paint mist discharge station to the upstream side and the downstream side is provided at each of the upstream and downstream ends of the paint mist discharge station. The floating paint mist discharging device according to any one of claims 1 to 5, wherein 7. The floating paint mist according to claim 2, wherein the article to be coated is a vehicle body of an automobile, and the opening is a window opening of the vehicle body. Ejection device. 8. The floating paint mist discharging device according to claim 1, wherein the different kinds of paints are different from each other in at least one of viscosity and surface tension. 9. The floating paint mist discharging device according to claim 8, wherein the different kind of paint contains at least one of a water-repellent paint and a hydrophilic paint. 10. The coating at the coating station is for the outermost coating film among the coating films of a plurality of layers to be formed on the surface of each article to be coated. The floating paint mist discharging device according to any one of 1.