JPS5822263B2 - Seiden Fun Tight Souhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic coating method that can improve the coating efficiency of a powder coating.

In electrostatic powder coating, a paint booth is generally used to prevent paint powder from scattering to the outside.

The paint booth is also equipped with a paint recovery device.
Paint that has not been applied to the object to be painted is collected and reused.

The ability to recover and reuse paint is one of the advantages of powder coating, which minimizes loss of paint.

However, in powder coating, it is difficult to spray paint intermittently every time the object to be coated passes the front of the coating machine, and usually it is sprayed continuously, so the object to be coated cannot be suspended. Even if the array shape is made as effective as possible, the current situation is that there is a lot of excess paint that passes through the gaps between the arrays of the objects to be coated and floats without being applied to the objects to be coated, scattering and leaking out of the coating booth. Therefore, paint loss and environmental pollution caused by this cannot be ignored.

In order to reduce paint loss, it is necessary to improve the paint booth or collection equipment to increase the recovery rate, but ideally, the amount of paint that floats without being applied to the object to be coated should be actively reduced. This is to reduce the number of people.

In order to reduce the amount of uncoated paint, it is necessary to effectively apply the paint ejected from the coating machine to the object to be coated, that is, to improve the coating efficiency.

Improving coating efficiency is also important for improving the efficiency of paint color changing operations.

Therefore, an object of the present invention is to provide a new electrostatic coating method that can dramatically improve coating efficiency.

Still another object of the present invention is to provide an electrostatic coating method that can significantly improve coating efficiency even when spraying paint from a coating machine is not intermittent but continuous.

This invention provides a conveyor for transporting objects to be coated so that there are multiple transfer paths for objects to be coated in the front of the coating machine in a painting booth, and the objects to be coated pass through a plurality of routes in front of the coating machine. The coating machine is characterized in that the paint passes through the machine twice, and the paint that does not adhere to the object to be coated that passes in front of the atomizer is made to adhere to the object to be coated that passes behind the object to improve coating efficiency. It is intended to increase.

In other words, the feature of the present invention is that when painting using powder paint or liquid paint with a slow evaporation rate, even if there is a slight time lag due to the properties of these paints, it is possible to apply multiple coats without adversely affecting the finished state of the paint. This was done based on the knowledge that this is possible.

The present invention will be explained below based on illustrated embodiments.

1 is a schematically illustrated painting booth, and 2 is a painting machine disposed within the booth 1, the number of which is appropriately determined as necessary.

Each coating machine 2 is connected to a suitable powder coating supply device 3, and sprays powder into the coating booth 1 from a nozzle at its tip.

Reference numeral 5 denotes a conveyor for suspending and transporting the object 6 to be painted, and is generally arranged on the ceiling of the painting booth 1.

After once passing through the booth 1, the conveyor 5 turns outside the booth and passes through the inside of the booth again.

In the embodiment, the conveyor 5a on the side closer to the back wall of the booth 1 is the outgoing route, and the conveyor 5b on the side closer to the coating machine 2
is the return trip, and the plurality of objects 6 suspended and supported at appropriate intervals pass through the oil side of the coating machine 1 in the coating booth 1 twice in sequence.

An electrostatic field is formed between the electrode at the tip of each sprayer and the object to be coated located in the booth, and the powder ejected into the booth is applied to the object to be coated suspended on either the forward or return conveyor. It is also designed to attract electrostatically.

The shape of the electrode or the means for forming an electrostatic field such as a means for applying a high voltage is appropriate.

The main coating action of the powder is performed between the coating machine 2 and the object to be coated on the return path side 5b, which passes just in front of the coating machine 2.

The powder passing through the gap between the objects to be coated on the inbound side and floating in the rear part of the booth is adsorbed by the objects to be coated on the outbound side 5a passing behind the booth.

There is a possibility that the coating state on the outward Σ road side 5a may be incomplete, as the coating film may be thin and patchy.
The coating is completed by the main coating action on the return side 5b.

Note that by transferring the object while rotating, a more uniform coating state can be obtained.

In this way, a plurality of objects to be coated, which are suspended and supported at appropriate intervals on a conveyor, are passed through the coating booth multiple times in succession, thereby removing excess powder that did not adhere to the objects to be coated due to the main coating action. Since the particles can be attached to any object to be coated located behind J, the powder coating efficiency is dramatically improved as a result.

Needless to say, the coating efficiency increases as the number of times the conveyor passes through the booth increases.

In the above description, the case where the reciprocating route section 4 is passed twice is shown, but it is also possible to make it three or more times.

In either case, each conveyor path is formed so that it gradually approaches the coating machine and the final passing route is immediately in front of the coating machine, so that the main coating action is performed during the final passing. It is better to make it .

In order to perform the coating action most effectively, the suspension interval of the objects to be coated, the diameter of the conveyor turn section 8, and the diameter of the conveyor turn section 8 must be adjusted so that the objects to be coated on the outward and return trips do not overlap each other in front of the coating machine 2. It is necessary to consider the installation position of the coating machine 2, etc.

The turn portion 8 of the conveyor 5 may be provided outside the painting booth 1 as shown in the figure, or may be provided inside the booth 1 depending on the case, but it may be necessary to If a large turn part is required or if you do not want the movable parts of the turn part to be contaminated with powder, it is better to install it outside the booth.

Note that the collection device attached to the coating booth is optional in the present invention.

As described above, the method of the present invention makes it possible to reliably attach surplus paint to the object to be painted, which would otherwise be discharged outside the booth in the conventional method in which the object to be painted passes through the booth only once. There is almost no loss of paint, which is extremely beneficial economically and in terms of preserving the working environment.

Furthermore, since the coating efficiency can be greatly increased, it is also possible to reduce the number of times the coating machine is operated, and the efficiency of the coating work can also be greatly improved.

Furthermore, since there is less surplus paint that has not been applied to the object to be painted, the burden on the collection equipment is reduced, making it possible to downsize the equipment, reduce the installation area of automatic painting lines, and reduce equipment costs. Bringing effective reforms to the entire facility.

Furthermore, the paint color changing work can be done much more efficiently due to the improved coating efficiency.

Note that the technical concept of the present invention is fully applicable to electrostatic liquid coating.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a schematic configuration diagram showing an embodiment of the present invention. 1 is a painting booth, 2 is a coating machine, 5 is a conveyor, and 6 is an object to be painted.

Claims (1)

[Claims] 1. In a method of electrostatic painting by passing objects to be coated suspended and supported at appropriate intervals on a series of conveyors in front of a coating machine installed in a coating booth, the objects to be coated in the coating booth are The conveyor is arranged so that the conveyor has a plurality of transfer paths in front of the coating machine, so that the object to be coated passes through the front surface of the coating machine multiple times,
The coating efficiency is increased by causing the excess paint that did not adhere to the object to be coated that passes in front of the coating machine to adhere to the subsequent object to be coated that passes behind the object to be coated. Electrostatic powder coating method.