JPS6211969Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to the structure of a product hanger in liquid bath electrodeposition coating.

Figure 1 shows an outline of a liquid bath type electrodeposition coating apparatus in a vertical cross section, where 1 is a bath filled with a coating chemical, 2 is a chemical,
3 is a rail of a conveyor for passing the product 4 to be electrodeposited through the chemical solution 2, 6 is a product hanger on the rail 3, and 7 is a bus bar that supplies electricity to the hanger 6, which is used as the negative electrode in the figure. The positive electrode 8 is placed in the chemical solution. FIG. 2 is a perspective view of the product hanger 6.
6a is a hook for hanging onto the conveyor, 6b is a mandrel hanging from the hook 6a, and 6c is an arm attached horizontally to the mandrel 6b in a cross shape, on which the product 4 is hung.

In electrodeposition coating, a paint film is applied to the hanger 6 at the same time as the product is painted, and this film is applied to the hanger 6.
acts as an electrical insulator in the subsequent use of
This will prevent the necessary electrical conduction to the product and reduce product quality. Therefore, in the past, this coating film had to be scraped off with a file or the like after each use.

In the present invention, the surface of the hanger 6 is treated so that even if a coating film forms, it can be removed by washing with water.

In this surface treatment, the hanger 6 is first coated with porous nickel plating, which is then impregnated with Teflon. FIG. 3 shows a schematic cross-section of the layer formed in this way, and FIG. be. Figure b shows the state in which the layer 10 is impregnated with Teflon 11, and the Teflon 11 mainly adheres to the pores 10a of the plating layer.
The other portions of the plating layer surface 10b remain exposed.

Since the surface of the hanger 6 has been treated as described above, there is little nickel-plated surface to which the paint film can adhere firmly, and the Teflon surface has little electricity and is incompatible with the paint film. The adhesion force is extremely weak. For this reason, during the washing process after the product passes through the bathtub, a considerable portion of the paint film attached to the hanger peels off due to the peeling of the paint film on the nickel plating surface as well as the part on the Teflon surface. The state is such that current can be allowed to pass.

As described above, according to the present invention, it is possible to save the trouble of removing the paint film from the hanger as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view of an electrodeposition coating device, FIG. 2 is a perspective view of a hanger, and FIGS. 3a and 3b are cross-sectional views of a hanger surface treatment layer according to the present invention. 1... Bathtub, 2... Chemical solution, 3... Conveyor rail, 4... Product, 6... Hanger, 7... Bus bar.

Claims (1)

[Scope of utility model registration request] The structure of the hanger used for electrodeposition coating is made of porous nickel plating, which is impregnated with Teflon.