JPS6223479A - Method for recovering paint - Google Patents

Abstract

PURPOSE:To enhance a paint recovery rate and to reduce the labor of cleaning, by recovering the paint running from an article to be painted after painting by receiving the same by a solvent and using said solvent as the diluent of the paint. CONSTITUTION:The article 1 to be painted fed from the previous process by an overhead conveyor 2 is immersed in the paint of a dipping tank 3 and painted to be fed to the next process. The paint dripped from the overhead conveyor 2 is received in the adjacent dripping receiving tank 14 to be dissolved in a solvent. Water being the solvent is directly supplied to the dripping receiving tank 14 by piping 8 and the diluting water containing the dripped paint is discharged from the overflow port 11 of the dripping receiving tank 14 to be recovered to a diluent tank 9 through a filter 10 and piping 12. This diluting water and the paint in a raw paint tank 7 is respectively supplied to a replenishing paint tank 6 to prepare replenishing paint tank 6 to prepare replenishing paint with predetermined concn. which is, in turn, replenished to the dipping tank 3 at any time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for recovering paint dripping from an object to be coated.

(Prior art) In depping or shower coating, the workpiece is usually placed on an overhead conveyor as shown in Figure 1, subjected to a predetermined pretreatment, applied with depping or shower coated, and then dried. Painting is performed continuously by removing the workpiece. In this method, for example, as shown in FIG. 2, in the depping coating, paint supplied from a raw paint tank 7 is diluted to a predetermined concentration with dilution water supplied from a pipe 8 in a replenishment paint tank 6, and then this replenishment is applied. The paint is supplied to the depping tank 3, and the depping tank 3
The coating is carried out by dipping the object 1 conveyed to the overbar by a rad conveyor 2. Depping tank 3
The paint 4 that drips from the object 1 that has been pulled off further is
Drop receiving gutter 5 conventionally installed along the conveyance path of the object to be coated
The waste was collected directly through the gutter or by being returned to the depping tank 3 in the loft.

(Problems to be Solved by the Invention) However, in the above conventional method, the dripped paint dries on the surface of the drip catch gutter 5, and the thin coating evaporates and increases in viscosity, preventing it from flowing into the dropping tank. There was a problem that the recovery rate of paint was poor because it adhered to the bridge. In addition, cleaning must be carried out frequently to remove deposits, and furthermore, the removed deposits must be disposed of, resulting in problems in terms of work efficiency and environmental hygiene.

Accordingly, an object of the present invention is to provide a paint recovery method that has a high recovery rate and does not require frequent cleaning or disposal of paint sludge, which would reduce production efficiency.

(Means for Solving the Problems) In order to achieve the above object, the paint recovery method of the present invention includes collecting paint dripping from a painted object in a solvent in a drip receiving tank. It consists of using a solution containing paint as a diluent for the paint.

The solvent for catching the dripping paint may be any solvent that can be used for each paint.In the case of dipping painting and shower coating, water-soluble paints are usually used, so the solvent should be Water or mixtures of water and other solvents are used.

The paint recovery method of the present invention is particularly advantageously applied to depping or shower coating using the overhead conveyor 2. These painting methods are carried out according to a method consisting of pretreatment, depping or shower coating, dripping, and drying, as shown in Figure 1, and the painting process involves diluting the paint supplied from the fresh paint tank 7 The replenishment paint produced in the replenishment paint tank 6 by dilution is supplied to a dipping tank or shower coating tank, and the object to be coated is immersed in the paint or the paint is sprayed.

However, it can be applied to other coating methods as well.

The solvent that has received the dripping paint is passed through a filter 10 if necessary, and then supplied directly or through the diluted liquid tank 9 to the replenishment paint tank 6. In the replenishment paint tank 6, the raw paint tank,
It is mixed with the paint supplied from 7 and used to produce a replenishment paint of a predetermined concentration.

The solvent in the drip-receiving tank may be directly supplied from the piping 8, but the solvent may be supplied from the piping 8 to the diluent tank 9 and then supplied into the drip-receiving tank 14 using the pump 13 so that the diluent is not diluted. Tank 9
It is also possible to circulate between the drip receiving tank 14 and the drip receiving tank 14.

(Function) As described above, by collecting the paint dripping from the painted object in the solvent, there is no chance of paint sticking inside the drip receiving tank, the filter 10, or other supply channels. , the dripping paint can be almost completely recovered.

(Example) Hereinafter, embodiments of the present invention will be used based on the drawings.

Example 1: FIG. 3 is an explanatory diagram of a depping coating process to which the recovery method of the present invention is applied. In this system, a workpiece 1 transported from a previous process by an overhead conveyor 2 is dipped in paint in a tapping tank 3 and coated. After that, the object to be coated 1 is transferred to the overhead conveyor 2 by 4J.
During the next process, the paint drips down into a drip-receiving tank 14 provided along the transport path adjacent to the dropping tank 3, and is dissolved in the solvent. Water, which is a solvent, is directly supplied to the drip tank 14 via piping 8. The dilution water containing the dripped paint is washed out from the overflow port 11° of the drip receiving tank 14, subjected to riIiS by the filter IO, and then collected through the pipe 12 into the diluent tank 9. This dilution water and the paint in the raw paint tank 7 are each supplied to a replenishment paint tank 6 through piping, and after being made into a replenishment paint of a predetermined concentration, it is replenished into the depping tank 3 at any time.

In this way, the paint dripping from the object J is reused.

Embodiment 2: FIG. 4 shows a paint recovery system that is the same as in Embodiment 1 except for the method of supplying dilution water to the drip receiving tank 14. In this embodiment, the dilution water supplied through the pipe 8 is first put into the dilution liquid tank 9.

This is pumped up using a pump 13 through a return pipe 15 connecting the diluted liquid tank 9 and the drip receiving tank 1, and is supplied to the drip receiving tank 14. The dilution water containing the dripped paint is collected into the dilution tank 9 through the filter 10 in the same way as in Example 1, and the dilution water is collected between the dilution tank 9 and the drip receptacle 4.
It is designed to circulate between

(Effects of the Invention) As described above, the present invention collects the paint dripping from the object 1 in a solvent and reuses it as a diluent for raw paint, so the paint dries on the drip receiving tank. There is no adhesion, and dripped paint can be almost completely recovered, resulting in a marked improvement in paint yield. Furthermore, since the solvent that has received the dripping paint is collected in the diluent tank, the collection method is extremely efficient. Furthermore, since there is no need to remove adhering paint, the frequency of cleaning can be reduced, and the amount of waste is also reduced, significantly increasing work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a process diagram showing the painting process of depping or shower coat painting, and Fig. 2 is an explanatory diagram showing the conventional painting and dripping process. FIG. 3 is an explanatory diagram showing Embodiment 1 according to the present invention. FIG. 4 is an explanatory diagram showing a second embodiment of the present invention. 1...Object to be coated 3...Dip tank 5...Drop catch gutter 6...Replenishment paint tank 9...Diluent tank 14...Drip catch tank patent applicant Toyota Motor Corporation (1 other person) Sai 1 illustration, 2 illustrations, 4 illustrations

Claims (1)

[Claims] A method for collecting paint, which comprises collecting paint dripping from a painted object in a solvent in a drip-receiving tank, and using the resulting solution containing the paint as a paint diluent.