KR20000030559A - An electropainting method using a powder melting type - Google Patents

Abstract

PURPOSE: A method for electron coating by melting paint powder is provided to improve the reliability since various colors are exhibited and very fine crevices are completely painted at a low cost by melting paint powder on the workpiece, and to increase the productivity by performing the painting for a large quantity of workpieces simultaneously. CONSTITUTION: A method for electron coating by melting paint powder includes the steps of pre-processing for removing impurities from the surfaces of a workpiece through phosphate zinc film coating process, first dehydrating the workpiece by an air blower, second dehydrating and drying the workpiece already dehydrated by the air blower and automatically supplied by an automatic feeding hopper again in an oven dryer, and painting the workpiece by preheating the dehydrated and dried workpiece at about 120°C, coating paint powder on the surface of the workpiece by using centrifugal force, and melting the paint powder on the surface of the workpiece to form a thin film having a uniform thickness in a heating zone of C-type circulation structure.

Description

An electropainting method using a powder melting type

The present invention relates to an electrodeposition coating method using a powder melting method, and more particularly, by applying a powder coating method in a series of processes, it is possible to produce a variety of colors, while maintaining a low maintenance cost, a large amount of coating objects by the melting method The present invention relates to an electrodeposition coating method using a powder melting method that allows the coating process to be shortened and productivity is improved by the separation of the input, and the coating is possible even with a small gap by the electrodeposition coating technique.

In general, there are various methods for painting the surface of various products in large quantities, but the representative ones can be divided into liquid electrostatic coating, powder coating, and electrodeposition coating.

Among them, liquid electrostatic coating or powder coating, which is the former case, is a method of adsorbing the surface of the workpiece by the suction force generated by spraying the paint with a sprayer and charging the atomized fine particles by electrostatic induction. Does not occur and is uniform.

However, the liquid electrostatic coating or the powder coating has a complicated composition, so that the micro-gap does not penetrate the paint due to the action of repulsive force. In the case of painting the mechanical parts, there is a problem that the productivity and workability is lowered, and in addition, there is a problem that it is difficult to collect various color production and lost paint (loss rate about 10%).

In addition, electrodeposition coating refers to electrophoretic coating, which is a plating method in which colloidal materials such as paints, metal powders, and heat-resistant powders are suspended in a conductive solution, and the colloid precipitates on the electrode to coat the metal surface of the electrode. As an electrolytic bath, water-based paints and water-soluble resins are mainly used for electrophoretic deposition on automobile bodies and parts.

However, the electrodeposition coating has the advantages of higher coating capacity, more uniform coating, easier drying and no loss of paint than the electrostatic coating method. However, the electrodeposition coating has a problem that it is not suitable as a small and medium coating equipment due to its complicated equipment. .

Accordingly, the present invention has been made to solve the above problems, the present invention is applied to a series of powder coating techniques in a series of processes, it is possible to produce a variety of colors while maintaining a low maintenance cost, a large amount of coating objects by the melting method At the same time, it is possible to provide an electrodeposition coating method using a powder melting method to improve the reliability of the product by shortening the coating process and improving productivity by simultaneously separating and inserting the coating, and allowing the coating to be made even through minute gaps by the electrodeposition coating technique. Is there.

Electrodeposition coating method using the powder melting method according to the present invention for achieving the above object, the pre-treatment step for removing the foreign matter that has been deposited on the surface of the coating object through a zinc phosphate coating process; Primary dewatering of the coating object from which the foreign matter on the surface is removed through the pretreatment process through an air blow; A step of automatically supplying a coating object having undergone the first dehydration step and dehydrating and drying it through an oven dry; And a coating process of preheating the dehydrated and dried coating object through the above process, coating the powder coating on the surface using centrifugal force, and forming a coating film by melting the paint spreading on the surface by melting and electrodeposition. It is done.

1-overall configuration of the coating equipment for explaining the electrodeposition coating method using a powder melting method according to the present invention,

2 is a schematic view of a powder melt electrodeposition coating machine applied to the electrodeposition coating method according to the present invention.

Hereinafter, the electrodeposition coating method using the powder melting method according to the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration of the coating equipment for explaining the electrodeposition coating method using a powder melting method according to the present invention.

As shown in the drawing, the present invention comprises: a pretreatment step for removing foreign matters accumulated on the surface of the coating object through a zinc phosphate coating process; Primary dewatering of the coating object from which the foreign matter on the surface is removed through the pretreatment process through an air blow; A step of automatically supplying a coating object having undergone the first dehydration step and dehydrating and drying it through an oven dry; Preheat the coating object dehydrated and dried through the above process, and apply powder coating to the surface using centrifugal force to melt. And a coating process for forming a coating film by melting a coating material applied to the surface by an electrodeposition method.

Hereinafter, each process will be described step by step.

Pretreatment process

The coating object undergoes a pretreatment process to remove foreign matters accumulated on the surface of the coating object through a zinc phosphate coating process in order to increase the coating efficiency.

In the pretreatment method, the degreasing and washing process are repeatedly performed by stepping into a bath consisting of eight tanks to remove foreign substances stuck on the surface. The tank consists of a pair of vortex generating fans at the bottom. It is composed of air nozzles for imparting compressed air into the tank, and the compressed air supplied from the vortex and the air nozzle formed by the fan for generating clothes for the various foreign substances accumulated on the plating object put into the tank. This can be removed quickly and effectively.

Primary dewatering process

When the foreign matter on the surface is completely removed through the pretreatment process, the air blower disposed on the upper portion of the water tank is operated to quickly dehydrate the water accumulated on the surface of the plating object by the wind generated by the operation.

Secondary Dewatering and Drying Process

The coating object subjected to the first dehydration process is introduced into an oven dry to perform secondary dehydration and drying.

The structure of the oven dry, while the shape is composed of a duct form equipped with a vortex circulation fan therein, the upper portion is provided with a passage through which a hot wind flows through the heating device and the lower portion from the coating object accommodated in the oven dry A discharge passage for discharging the wet steam to the outside is provided, and the wet steam discharged through the discharge passage is removed while passing through the dehumidification filter, and the hot wind causes the heating device to circulate again so that the warmed air in the oven driver is not discharged to the outside. It does not maximize thermal efficiency.

Painting process

When the coating object dehydrated and dried through the above process is attached, it is introduced into the powder melt electrodeposition coating machine as shown in FIG. 2 and first, the coating object is preheated to a predetermined temperature at a temperature of about 120 degrees.

The coating object preheated as described above is introduced into the powder coating rotating tank by a conveyor. The powder coating rotating tank has a shape similar to that of a washing machine, and rotates the coating object injected therein at a high speed to be generated by the rotation. By centrifugal force, the paint (powder coating) is applied to the coating object with a certain thickness.

When the coating material is applied to the coating object through the above process, the coating object is introduced into the heating zone of the input belt having a C-type circulation structure.

In this way, the coating object introduced into the heating zone of the feeding belt is gradually dissolved in a powder coating thinned on the surface by the heating means disposed on the upper surface thereof to form a coating film having a constant thickness so that the coating proceeds uniformly and continuously.

In addition, the object to be painted through the above process is transported downward through the belt to pass through the cooling zone and finally the finished product is discharged through the outlet.

The present invention is capable of forming a dense film after coating by pre-treating the foreign matter splattered on the surface of the coating object through a zinc phosphate coating process, and applying a powder coating technique during a series of processes to produce a variety of colors, while maintaining a low maintenance cost. By holding and melting a large amount of coating objects at the same time by the melting method, there is an effect of shortening the coating process and improving productivity.

In addition, it is possible to paint even a small gap by the electrodeposition coating technique to improve the reliability of the product.

Claims (1)

A pretreatment step for removing the foreign matter accumulated on the surface of the coating object through a zinc phosphate coating process; Primary dewatering of the coating object from which the foreign matter on the surface is removed through the pretreatment process through an air blow; A step of automatically supplying a coating object having undergone the first dehydration step and dehydrating and drying it through an oven dry; And a coating process of preheating the dehydrated and dried coating object through the above process, coating the powder coating on the surface using centrifugal force, and forming a coating film by melting the paint spreading on the surface by melting and electrodeposition. Electrodeposition coating method using powder melting method.