JPS5833032B2 - Seidenfuntaitosou Niokel Yojiyoufuntaitoryouno Jiyokiyohouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing excess powder paint adhering to an object to be coated in electrostatic powder coating. The purpose is to reduce the amount of powder falling during the process of transporting objects to be coated by giving the powder a certain amount of moisture and allowing some of the powder coating material to fall off in advance.

Conventionally, in powder coating factories that process large objects to be coated, such as automobile bodies, in a variety of colors and in large quantities, powder coatings are sprayed onto the objects to be coated, and then the powder coating is applied in a baking oven. In the conveyance process up to the start of flow, excess powder paint (i.e., when a charged powder paint is applied to an object to which a voltage has been applied, paint particles are gradually layered from the surface of the object to be coated). However, once the thickness reaches a certain level, the repulsive force between the paint particles becomes stronger than the suction force toward the object, so for paint particles that adhere to the upper layer, these The so-called surplus powder paint is only temporarily attached, and the slight vibrations applied to the object while it is being conveyed to the next process by a conveyor will cause the excess powder paint to stick. Paint particles that slide on the outside surface and fall (4) fall to the floor and accumulate or become suspended in the atmosphere as dust, which is difficult to collect and reuse, resulting in loss of paint and generation of dust. However, the present invention provides a method for removing excess powder paint in order to solve these problems.

To explain an embodiment of the present invention according to the drawings, as shown in the first step, an ordinary workpiece 3 suspended from a conveyor A by a hanger 2 is transferred to an electrostatic powder coating gun 1. Then, electrostatic powder coating is performed inside the booth 4.

Thereafter, in the second step, when the hanger 2 passes through several uneven portions A'// formed on the rail of the conveyor A, the object 3 to be coated with the powder coating B is coated. Due to the vibrations acting on the coated object, 3% of the powder coating B fell, and after that there was almost no ongoing falling.

In this case, the shape of the uneven portion A' of the rail is determined so that the vibration acting on the object 3 to be coated when the hanger 2 passes through the uneven portion A' is 0.1 G.

Furthermore, vertical or horizontal vibrations are forcibly applied from the outer surface of the object 3 or from both sides of the hanger 2 installed to receive vibrations, and the strength of these vibrations is determined according to the object 3 to be coated. Just do it.

Of course, the object 3 to be coated is prevented from falling from the hanger 2.

In the third step, a situation is shown in which the product is then hung and transported on a hanger 2 until the baking process.

In the embodiment, a method is shown in which the object to be coated 3 is hung on a hanger 2, but a method (not shown) in which the object to be coated is placed on a trolley or the like and moved on a conveyor for painting is also possible, in which the trolley or the like is vibrated. It is also possible by

As already mentioned, the position on the conveyor line where the vibration is applied is immediately after powder spraying, and in the example, the case is shown where it is performed in the same booth among the optimal positions on each line.
If dust can be collected in a different location, there is no problem with adding vibration, or you can add dust collection and vibration positions for each color so that excess paint can be collected in different locations for each color. .

Furthermore, when collecting and reusing paint that has fallen by applying vibration, it is possible to reduce paint loss, and
It can prevent powder paint from scattering.

However, in this case, even if the paint is not collected and reused, it is difficult to completely prevent the powder paint from scattering, but most of it can be recovered.

By the way, the forced vibration process and its range covered by this method are from electrostatic powder coating to the time when it enters the baking hot air oven and before flow begins and there is no possibility of the powder coating falling. .

However, in order to be more effective, it is best to apply force as soon as possible after electrostatic powder coating, although it depends on the equipment layout, so try applying it in a spray booth. It is being

As a method of applying vibration to the hanger 2, the trolley, etc., the rail of the conveyor A as in this embodiment, or the
One method is to add unevenness to the path of the cart to give vertical acceleration to the hanger 2 or the cart.The other is to add drops at various places to give strong vertical acceleration.A method is to make a sharp curve in the middle of the conveyor and tilt the hanger 2 to give left and right acceleration. Another possible method is to collide the carts with each other to provide longitudinal acceleration.

As mentioned above, the direction of vibration basically includes the up-down, left-right, and front-back directions, and any method can be used as long as it is effective, and the vibration method may be determined depending on the object to be coated and the conveying means.

The present invention removes excess powder paint by the method described above, and after performing electrostatic powder coating, a hanger for transporting the object to be coated is passed through the uneven portion of the rail at a predetermined position. By applying vibration to the object to be coated, most of the excess powder paint falls off at a certain position and is removed, making it easy to collect and reuse fallen paint and preventing the generation of dust. Moreover, it has the effect of eliminating the need to clean the floor during the transportation process.

[Brief explanation of the drawing]

The drawing shows electrostatic powder coating being applied to the object to be coated in the first step, and in the second step, vibrations of an appropriate strength are applied to the object to be coated, etc. to cause some of the powder to fall. , and then transport as shown in the third step. A... Conveyor, A'... Uneven part, B
...Powder coating, 1...Electrostatic powder coating gun, 2...Hanger 3...Object to be coated, 4.
...Spraying booth.

Claims (1)

[Claims] 1 In electrostatic powder coating, during transportation of the object to be coated after painting until it enters the baking oven and the paint starts to flow, by adding an appropriate vibration means in advance to a specific place, it is possible to reduce the amount of adhesion to the object to be coated. A method for removing excess powder paint by dropping a portion of the powder and reducing the amount of residual powder paint that subsequently falls during transportation of the coated object.