JPS6250335A - Plasma treatment apparatus - Google Patents

Abstract

PURPOSE:To effect the uniform plasma treatment of bumpers within a short time without increasing the size of the apparatus, by injecting a plasma gas from a rotary shaft and/or hungers. CONSTITUTION:Bumpers B are mounted on hungers 23 of a rotary device 8 in a holding chamber 1, and the pressure in the chamber 1 is decreased by operating a regulation valve of a vent 3. Supporting discs are rotated by operating a motor 18 and at the same time a plasma generator is started. The plasma gas fed from this generator is passed through a feed pipe 25 and is injected from injection openings in a rotary shaft 10 as a plasma injection pipe. The increase in the pressure in the chamber 1 by plasma gas injection is prevented by operating the regulation valve of the vent 3. If required, the hangers 23 may be used as plasma gas injection pipes.

Description

Detailed Description of the Invention Object of the Invention (Industrial Field of Application) The present invention provides a method for placing bumpers and other synthetic resin molded products on a plurality of hangers attached to a rotating support disk in a storage chamber. The present invention relates to a plasma treatment device that improves the adhesion of paint or the like by subjecting the surface to plasma treatment, and specifically relates to a plasma injection tube for injecting plasma.

(Prior art) Polyolefin thermoplastic resins such as polyethylene (PE) and polypropylene (PP) or various thermosetting resins have poor adhesion to paints and adhesives, and even when these are applied, the paint film may peel off. Cheap. For this reason, various pretreatment methods have been adopted, and in recent years, plasma treatment methods have come into frequent use, in which the surface of synthetic resin substrates is modified by electric discharge treatment under reduced pressure.

An example of an apparatus for carrying out the above-mentioned plasma treatment is the apparatus shown in Japanese Patent Application No. 58-236546 previously filed by the applicant of the present invention.

That is, the plasma processing apparatus shown in FIG. 5 includes an airtight storage chamber 51 for storing a synthetic resin bumper B etc. which is an article to be treated, and a storage chamber 51 arranged on the inner wall of the chamber 51 for supplying plasma gas to the article to be treated. One plasma injection tube 52 that injects,
An exhaust port 55 for reducing the pressure inside the storage chamber 51 and a rotating shaft 5
A pair of support disks 53a and 53b that rotate together around 7.
and a plurality of hangers 54, which are relatively rotatably attached between the pair of support disks 53a and 53b, and on which the objects to be processed are placed.

The plasma injection tube 52 is connected to a plasma generator (not shown) via an introduction tube 56, and is configured to inject oxygen plasma gas supplied from the generator into the accommodation chamber 51.

(Problem to be Solved by the Invention) However, since the above-mentioned apparatus has only one plasma injection tube in the storage chamber, it takes a long time to uniformly plasma-treat the entire surface of a large molded product such as a bumper. There is a problem that it is necessary.

Therefore, as a means to shorten the processing time, a configuration in which a large number of plasma injection tubes are provided has been adopted, but this poses problems such as complicating the plasma processing apparatus and increasing manufacturing cost.

The present invention has been made in view of these problems, and is a means of uniformly plasma-treating the target product in a short time without complicating the plasma processing equipment when processing large molded products such as bumpers. It provides:

Structure of the Invention (Means for Solving the Problems) That is, the present invention provides a storage chamber for accommodating objects to be painted such as synthetic resin bumpers, a plasma injection pipe for injecting plasma gas into the storage chamber, and a plasma injection tube for injecting plasma gas into the storage chamber. It consists of an exhaust port that depressurizes the air, a pair of support disks that rotate together around a rotating shaft, and a plurality of hangers that are attached so as to be relatively rotatable between the pair of support disks and on which the workpiece to be coated is placed. The above-mentioned problems are solved by employing a plasma processing apparatus equipped with a rotating device, in which the rotating shaft and/or the hanger are plasma injection tubes.

(Function) The rotating shaft is located at the center of each hanger on which an item to be processed is placed, and is located at a close distance from the item to be processed. Therefore, the plasma gas injected from the rotating shaft is uniformly diffused to the objects to be processed placed on each hanger, and the amount of irradiation to the objects to be processed is also sufficient. Further, even when a part of the hanger is configured as a plasma injection tube, it is possible to sufficiently irradiate the plasma gas to the workpieces placed on the adjacent hangers.

Therefore, by employing these configurations, it is possible to uniformly process the items to be processed in a short time.

(Example) Hereinafter, an example in which the present invention is embodied in an apparatus for plasma-treating the surface of a vehicle bumper will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, the storage chamber 1 of the plasma processing apparatus of this embodiment has an entrance 2 at its negative end, and a door 4 is attached to the entrance 2 so that it can be opened and closed. Furthermore, an exhaust port 3 connected to a suction pump (not shown) is provided at the center of the back wall of the storage chamber 1, making it possible to reduce the pressure inside the storage chamber 1.

Furthermore, a pair of rails 5 are arranged at a predetermined interval at the bottom of the storage chamber 1 and extend over almost the entire length of the storage chamber 1, supporting the rotary support 6 so as to be movable in the direction of the door 4. ing.

As shown in FIGS. 1 to 3, this rotary support stand 6 is composed of a support frame 7 and a rotation device 8 supported on the support frame 7 so as to be rotatable around a horizontal axis. A plurality of wheels 9 are rotatably attached to both sides of the lower part and are rotated along the rail 5. Further, the rotating device 8 includes a central rotating shaft 10 and a pair of support disks 11 fixed near both ends of the rotating shaft 10.

The rotating ring 10 is made of stainless steel and has a hollow cylindrical shape with one end sealed, and an introduction pipe 25 is detachably attached to the other end by a locking mechanism (not shown). The other end of the introduction pipe 25 is connected to a plasma generator (not shown).

Furthermore, a large number of injection ports 26 are formed almost uniformly over the entire circumference of the rotating shaft 10, so that the oxygen plasma gas supplied from the plasma generator is injected into the storage chamber l.

Further, a float 12 is fixed to the right end of the rotating shaft 10, and a sprocket wheel 13 is fixed to the left side.

Corresponding to this sprocket wheel 13, a second sprocket wheel 14 and a gear 15 are rotatably supported on the left side plate of the support frame 7 by a support shaft 16, and a chain 17 is connected between both sprocket wheels 13 and 14. It is hung. Further, a motor 18 is disposed outside the storage chamber 1 via a support plate 19, and a motor shaft 20 thereof projects into the storage chamber 1 via a bearing sleeve 21. A gear 22 is provided at the inner end of this motor shaft 20.
is fixed, and as the rotary support base 6 moves into the storage chamber 1, it engages with and separates from the gear 15 on the support frame 7.

As shown in FIG. 1.2, there are a plurality of hangers 2 (six in this embodiment) between both support disks 11 of the rotary support base 6.
3 is attached to the upper end portions of the left and right side plates thereof so as to be relatively rotatable by means of support shafts 24, and the article to be processed, such as a synthetic resin automobile bumper B, is placed on top of the support shaft 24.

Next, a process for processing the bumper B using the plasma processing apparatus having the above configuration will be explained.

First, open the door 4 of the storage chamber 1, slide the rotating device 8 housed in the center of the door toward you together with the support frame 7, and place the bumper B to be subjected to plasma treatment on each hanger 2.
3. Place it in the specified position.

Furthermore, the rotating device 8 is returned to the center of the storage chamber l, the tip of the introduction tube 25 and the tip of the rotating shaft 10 are fitted via the lock mechanism, and then, after closing the door 4, the exhaust port 3 is connected to the rotating device 8. A provided opening/closing valve (not shown) is opened to reduce the pressure inside the storage chamber 1 to about 0.5 to 0.6 Torr.

When the pressure inside the storage chamber 1 is reduced to a predetermined pressure, the opening/closing valve is closed, and the motor 18 is activated to rotate the support disk 11.

On the other hand, at the same time as the support disk 11 rotates, the plasma generator also starts, and the plasma gas supplied from the generator passes through the introduction pipe 25 and enters the accommodation chamber 1 from each injection port 26 of the rotating shaft lO, which is a plasma injection pipe. Injected. Note that at this time, the opening/closing valve provided at the exhaust port 3 is slightly opened to prevent an increase in the pressure inside the storage chamber 1 due to the injection of plasma gas.

As described above, in the plasma processing apparatus described in Section 2, since plasma gas is injected from the rotating shaft 10 near the bumper B, uniform plasma processing can be performed in a short time.

Next, FIG. 4 shows another embodiment of the present invention, in which not only the rotating shaft 10 but also the frame 28 of the hanger 23 are configured as plasma injection tubes, and the frame 28 of the hanger 23 is placed on the adjacent hanger 23. The bumper B is irradiated with sufficient plasma gas. Therefore, it is possible to perform uniform plasma treatment in a shorter time, and bumper B
In addition, it can be particularly applied to plasma processing of workpieces with complex surface shapes.

Note that the present invention is not limited to the above-mentioned embodiments; for example, the number of injection ports may be increased, the cross-sectional shape thereof may be made oval, and the diameter and material of the rotating shaft may also be changed. It is possible to freely change the detailed specifications without departing from the gist.

Effects of the Invention As detailed above, in the present invention, plasma gas is jetted 1.1 from the rotating shaft and/or hanger located close to the object to be processed, such as a bumper. This is an excellent invention that can be applied to plasma treatment not only for bumpers but also for various synthetic resin molded products.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of a plasma processing apparatus embodying the present invention, FIG. 2 is a perspective view of the same apparatus, FIG. 3 is a partially enlarged side sectional view of the same apparatus, and FIG. This figure is a perspective view showing another embodiment, and FIG. 5 is a perspective view showing a conventional plasma processing apparatus. ■... Containment chamber, 10... Rotating shaft, 23... Hanger, B
··bumper. 312 Figure jI4BKI Figure 5 Procedure r City 1E Kichi (Method) 2. Name of the invention Plasma processing device 3 Relationship with the person making the amendment f1: Patent applicant address Ochiai Aza Ryohata, Kasuga Village, Nishi Kasugai District, Aichi Prefecture 1
Address Name Toyoda Gosei Co., Ltd. (Name) Representative Masahiro Nemoto 4, Sototo

Claims (1)

[Claims] 1. A storage chamber (1) that accommodates objects to be painted such as synthetic resin bumpers (B), a plasma injection pipe that injects plasma gas into the storage chamber (1), and a depressurization system inside the storage chamber (1). a pair of support disks (11) that rotate integrally around a rotating shaft (10), and a pair of support disks (11) that
) and a rotating device (8) consisting of a plurality of hangers (23) on which the workpiece to be coated is mounted and mounted so as to be relatively rotatable between the rotating shaft (10).
and/or a plasma processing apparatus characterized in that the hanger (23) is a plasma injection tube.