JPS6351062B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a plasma treatment apparatus for applying plasma treatment to the surface of an object to be painted, such as a synthetic resin bumper.

Conventional technology Conventionally, this type of plasma processing apparatus has arranged synthetic resin bumpers of automobile parts made of polypropylene etc. in a layered parallel arrangement in a sealed storage chamber, housed a plasma injection tube, To make it easier for paint to adhere to
Plasma gas such as oxygen was injected from the injection tube onto the surface of the bumper to be treated, thereby activating the surface of the bumper to be treated.

However, in this conventional device, the plasma introduction port is provided in the center of the injection tube, and injection ports with a constant inner diameter are arranged at equal intervals on both sides of the injection tube, so the plasma introduction port There was a problem in that the amount of plasma gas injected from each injection port decreased as the distance from the bumper increased, making it impossible to uniformly inject plasma gas to a large number of bumpers. Further, in the conventional device in which the plasma exhaust port is provided on one side wall of the storage chamber, there is a problem that the plasma gas flow toward the exhaust port is biased, and the bumper surface is not uniformly activated.

Purpose of the Invention The present invention was made to eliminate the above-mentioned defects, and its purpose is to provide a new plasma treatment that can uniformly plasma-treat the surface of an article to be painted such as a bumper. It's about doing.

Structure of the Invention In order to achieve the above object, the present invention includes a storage chamber for accommodating a synthetic resin article to be coated approximately in the center of the plasma injection tube, an introduction pipe for introducing plasma into the storage chamber, a plasma injection tube having an introduction port connected to the introduction pipe in the chamber, and a injection port for injecting the plasma introduced from the introduction pipe onto the surface to be treated of the article to be coated; In a plasma processing apparatus equipped with an exhaust port provided in the storage chamber for discharging the plasma, the plasma injection tube is provided in the storage chamber almost parallel to the surface to be treated of the article to be coated, and the plasma injection tube is provided on the outer circumferential surface of the plasma injection tube. A large number of the injection ports are provided toward the surface to be treated, and the opening area of the injection ports per unit length of the plasma injection tube is gradually increased from the introduction port toward the end. In order to gradually increase the opening area of the injection ports per unit length of the plasma injection tube from the introduction port toward the end, the arrangement interval between the injection ports gradually decreases as you move from the introduction port toward the end. It is possible to adopt a configuration in which the injection port is provided as shown in FIG.

Embodiment An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 6. The main body 1 constituting the airtight storage chamber of the plasma processing apparatus is formed into a hollow cylindrical shape, and the left side wall thereof is provided with a door (not shown) that can open and close the storage chamber, and the upper right side wall is provided with a plasma exhaust door. An outlet 2 is formed. A rectangular frame 3 is accommodated within the main body 1, and pillars 4 facing each other are erected on both left and right sides of the frame 3.

A rotary shaft 5 is rotatably supported between the upper ends of both supports 4, and a pair of support disks 6a, 6b are mounted at both ends of the rotary shaft 5 so as to be integrally rotatable.
Between the inner surfaces of both support disks 6a and 6b, six support stands 7 are arranged at predetermined angular intervals on which objects to be painted, for example bumpers B made of synthetic resin such as polypropylene, are placed. There is.

As shown in FIG. 2, each support stand 7 includes a pair of support pieces 8 formed by bending a metal plate, an erection rod 9a installed between both support pieces 8, and each end of each installation rod 9a. A connecting rod 9b is arranged on the lower surface of each support piece 8 to connect the parts, and each support piece 8 is connected to each support disk 6 by a metal fitting 10 or the like at its upper end.
It is rotatably supported by a and 6b. Therefore,
Each support stand 7 is held in a horizontal position when the rotating shaft 5 and support disks 6a, 6b are rotating and when they are stationary. Further, a net 11 is provided in the central notch of each support piece 8 to allow passage of plasma gas.

As shown in FIG. 3, a chain wheel 12 is inserted into the left end of the rotating shaft 5, and a chain wheel 13 and a transmission gear 14, which rotate around one axis, are provided on the frame 3. A chain 15 is hung between the chain wheels 12 and 13, and a drive gear 16 that is rotationally driven by a drive motor (not shown) is meshed with the transmission gear 14.

As the drive gear 16 rotates, the support disks 6a and 6b are rotated together with the rotating shaft 5 via the transmission gear 14, chain wheel 13, chain 15, and chain wheel 12.

As shown in FIG. 1, below the frame 3, a stainless steel injection pipe 17 for injecting plasma gas such as oxygen is installed in the main body 1 at the bumper B.
is housed so as to be almost parallel to the surface to be treated. As shown in FIG. 4, an introduction tube 18 is connected to a plasma introduction port (not shown) formed approximately in the center of the injection tube 17, and its end is connected to a plasma supply device (not shown) outside the main body 1. Connected.

On both sides of the inlet, a large number of injection ports 19 are provided on the outer circumferential surface of the injection pipe 17 toward the surface to be treated of the bumper B, with the arrangement interval gradually decreasing toward the end of the injection pipe 17 and the inner diameter gradually increasing. It is being Each injection port 19 is directed forward at a predetermined angle θ with respect to the vertical plane S.
1 (in this example, 30 degrees) opens in the direction of inclination 19a, and opens in the rear side at a predetermined angle θ2 (in this example, 30 degrees) opens in the direction of inclination 19b
It is composed of. Further, the injection ports 19a that are inclined toward the front side and the injection ports 19b that are inclined toward the rear side are arranged alternately. Further, the number of injection ports 19 on the side of the discharge port 2, that is, on the right side of the introduction pipe 18, is set to be 15% smaller than the number of injection ports 19 on the left side of the discharge port 2.

Therefore, when the drive motor is operated with the bumper B placed on each support stand 7 in the main body 1, the bumper B rotates through the drive gear 16, transmission gear 14, chain wheel 13, chain 15, and chain wheel 12. The shaft 5 and the support disks 6a, 6b are rotated, and each support stand 7 together with the bumper B is rotated relative to each support disk 6a, 6b around its upper end, and during the rotation of each support disk 6a, 6b. Also, each bumper B is held horizontally.

Furthermore, if plasma gas such as enzyme is introduced into the injection tube 17 through the introduction tube 18, the plasma gas is injected from each injection port 19. However, since the injection pipe 17 is provided in parallel with the surface to be treated of the bumper B, and the injection port 19 is directed toward the end, the arrangement interval gradually decreases and the inner diameter gradually increases. A substantially constant amount of plasma gas can be injected toward the surface to be treated from the injection port 19 both at the central portion where the two are connected and at the end portions. Therefore, the treated surface of the bumper B is uniformly activated, and the adhesion of paint can be significantly improved.

Furthermore, in this embodiment, the number of injection ports 19 on the discharge port 2 side, that is, on the right side of the inlet pipe 18, is set to be smaller than the number of injection ports 19 on the left side, so that the plasma gas flow toward the discharge port 2 is set to be smaller than the number of injection ports 19 on the left side. There is no deviation in the flow, and a uniform flow can be achieved, making it possible to perform even more uniform plasma treatment on the bumper B.

In addition, conventional injection tubes are made of quartz, but in this example they are made of stainless steel, so they can be used to generate plasma of nitrogen and oxygen mixed gases containing corrosive gases such as methane tetrafluoride. Not only can it be used, but it can also ensure sufficient strength, be easy to install, and be manufactured at low cost.

Effects of the Invention As detailed above, the present invention provides a storage chamber for accommodating a synthetic resin article to be coated, an introduction pipe for introducing plasma into the storage chamber, and an inlet pipe connected to the introduction pipe in the storage chamber. a plasma injection tube having an inlet and an injection port for injecting the plasma introduced from the introduction tube onto the surface to be treated of the article to be coated; and a plasma injection tube provided in the accommodation chamber for discharging the plasma in the accommodation chamber. In the plasma processing apparatus, a plasma injection tube is provided in the storage chamber in parallel with the surface to be treated of the article to be coated, and the injection port is directed toward the surface to be treated on the outer peripheral surface of the plasma injection tube. By providing a large number of plasma injection tubes and gradually increasing the opening area of the injection port per unit length of the plasma injection tube from the introduction port toward the end, it is possible to spray the plasma from the plasma injection tube toward the surface of the workpiece to be coated. Since the amount of plasma generated can always be kept constant both at the inlet and at the end,
This provides an excellent effect in that the surface to be treated can be uniformly plasma-treated.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a plasma processing apparatus embodying the present invention, Fig. 2 is an enlarged perspective view showing a part of the support base, Fig. 3 is a partial left side view, and Fig. 4 is a front view of the injection tube. , FIG. 5 is a cross-sectional view taken along the line A--A in FIG. 4, and FIG. 6 is a cross-sectional view taken along the line B--B in FIG. 4. Injection pipe...17, Introduction pipe...18, Injection port...
19. Bumper...B.

Claims (1)

[Claims] 1. A storage chamber for accommodating a synthetic resin article to be painted;
An introduction pipe for introducing plasma into the storage chamber, an introduction port connected to the introduction pipe in the storage chamber, and an injection port for spraying the plasma introduced from the introduction pipe onto the surface to be treated of the article to be coated. In the plasma processing apparatus, the plasma injection tube 17 is arranged substantially parallel to the surface to be treated of the article to be coated. A large number of injection ports 19 are provided on the outer circumferential surface of the plasma injection tube 17 toward the surface to be treated, and the opening area of the injection ports 19 per unit length of the plasma injection tube 17 is set as described above. A plasma processing device characterized in that the plasma gradually increases from the mouth to the end. 2. The injection ports 19 are arranged so that their arrangement intervals gradually decrease from the introduction port toward the end, thereby reducing the opening area of the injection ports 19 per unit length of the plastic plasma injection pipe 17 to the same amount as the introduction port. 2. The plasma processing apparatus according to claim 1, wherein the plasma processing apparatus gradually increases from the beginning to the end. 3 The injection port 19 is provided so that its inner diameter gradually increases from the introduction port toward the end, thereby increasing the opening area of the injection port 19 per unit length of the plasma injection pipe 17 from the introduction port. 2. The plasma processing apparatus according to claim 1, wherein the plasma processing apparatus increases gradually toward the end.