JPS6245632A - Plasma treatment apparatus - Google Patents

Abstract

PURPOSE:To effect the plasma treatment of a large molding such as a bumper uniformly within a short time, by making the reciprocating motion of a hunger possible. CONSTITUTION:Bumpers B are mounted on hungers 5 fixed on a supporting frame 6 in a holding chamber 1 and the pressure in the chamber 1 is decreased by adjusting a valve 7 in a vent 2. The frame 6 is reciprocated along rails 8 by actuating an electric motor 13. Simultaneously with the start of reciprocation of the frame 6, a plasma generator is operated and the plasma gas is injected into the chamber 1 through a supply pipe 4 and an injection port 17 of each of two plasma injection pipes 3a and 3b to effect the plasma treatment of bumpers B.

Description

Detailed Description of the Invention Object of the Invention (Field of Industrial Application) The present invention is directed to placing a bumper or other synthetic resin molded product on a plurality of hangers attached to a support frame in a storage chamber, and This invention relates to a plasma treatment device that improves the adhesion of paint, etc. by subjecting it to plasma treatment.

(Conventional technology) Polyolefin thermoplastic resins such as polyethylene (PE) and polypropylene (PP) and various thermosetting resins have poor adhesion to paints and adhesives, and even when these are applied, the paint film may peel off. It is known to be easy. Various pretreatment methods have been adopted as countermeasures against this problem, and in recent years, plasma treatment methods have come into widespread 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 application.

That is, the plasma processing apparatus shown in FIG. 4 includes an airtight storage chamber 51 for accommodating the bumper B and other synthetic resin molded products to be painted, and a storage chamber 51 disposed on the inner wall of the storage chamber 51 for accommodating the bumper B and other synthetic resin molded products to be painted. A single plasma injection tube 52 for injecting plasma gas onto the painted surface, an exhaust port 55 for reducing the pressure inside the storage chamber 51, a pair of support disks 53a and 53b that rotate together around a rotation axis, A pair of support disks 53a, 5
3b and a plurality of hangers 54 on which objects to be coated are placed.

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

(Problems to be Solved by the Invention) In the above plasma processing apparatus, a plurality of hangers on which objects to be coated are mounted are attached between a pair of support disks, and plasma gas is supplied while rotating together with the support disks. A configuration is adopted in which irradiation is performed.

However, hangers located relatively far away from the plasma irradiation tube are blocked by other hangers and are not irradiated with plasma gas sufficiently. There is a problem in that it takes a long time to perform a plasma treatment.

The present invention has been made in view of the above problems, and provides a means for uniformly plasma-treating large molded products such as bumpers in a short period of time.

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. A plasma processing apparatus equipped with an exhaust port for reducing the pressure of the plasma and a plurality of hangers on which objects to be coated are placed, characterized in that a support frame for supporting the plurality of hangers is provided so as to be reciprocally movable. The above-mentioned problems have been solved by devising a plasma processing apparatus.

(Function) By attaching a plurality of hangers on which objects to be coated are mounted to a support frame, and moving the support frame back and forth within the storage chamber, plasma gas is injected onto the processing surface of the objects to be coated. Since the treated surface of the painted product is continuously irradiated with uniform plasma gas, even large molded products such as bumpers can be uniformly treated with plasma 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 31.

First, as shown in FIGS. 1 and 2, the storage chamber 1 of this embodiment is formed in the shape of a hollow rectangular parallelepiped, and a door (not shown) is provided on the front wall of the storage chamber 1, and the interior thereof is made airtight. It has become.

Further, an exhaust port 2 connected to a suction pump (not shown) is provided in the center of the right side wall of the storage chamber 1, and the inside of the storage chamber 1 can be adjusted to a desired atmospheric pressure by opening and closing a valve 7. There is.

Next, a pair of rails 8 are arranged at a predetermined interval at the bottom of the storage chamber 1, extend over almost the entire length of the storage chamber 1 in the longitudinal direction, and movably support the support frame 6. . That is, wheels 9 that move along rails 8 are rotatably attached to four locations on the bottom of the support frame 6, so that the support frame 6 can be reciprocated in the longitudinal direction of the storage chamber 1. There is. The support frame 6 is constructed by combining stainless steel frames 10 into a rectangular parallelepiped shape, and between the pair of upper frames 10 is a hanger 5 for placing a synthetic resin bumper B such as polypropylene or polyurethane. A plurality of units (four units in this embodiment) are attached at intervals. As shown in FIG. 3, each hanger 5 includes a pair of support pieces 13 formed by bending a metal plate;
A pair of construction rods 1 installed parallel to each other on their lower surfaces
4a, 14b, a connecting rod 15 that connects these erection rods 14a, 14b, and a net 16 for supporting the end of the bumper B.

Next, one end of a stainless steel shaft 12 connected to a drive device outside the storage chamber 1 is fixed to the lower center of the side plate 11 at the left end of the support frame 6, and the rotary movement of the variable speed motor 13 is transferred to the wheel 14. Together with the connecting rod 15, the linear motion is converted into linear motion and transmitted to the support frame 6.

Next, a large number of injection ports 17 are provided on the upper inner wall of this storage chamber 1 (two stainless steel plasma injection tubes 3a, 3b).
are arranged in parallel. Furthermore, these two plasma injection tubes 3a and 3b are each connected to a plasma generation device (not shown) via an introduction tube 4, and oxygen plasma gas supplied from the device is injected into the storage chamber 1. It looks like this. In addition, these two plasma injection tubes 3
a.

The overall length of each bumper 3b is configured to be longer than the overall length of the bumper B by approximately -0.0% at both ends, so that both ends of the bumper B are also irradiated with sufficient plasma gas.

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

First, the door of the storage chamber 1 is opened, and the bumper B is placed at a predetermined position on each hanger 5 attached to the support frame 6 to reduce the pressure. Next, when the pressure inside the storage chamber 1 is reduced to a predetermined pressure, the valve 7 is closed and the motor 13 is activated.The rotational motion is converted into linear motion and transmitted to the support frame 6, so that the support frame 6 It begins to reciprocate left and right on the rail 8. (In this example, the stroke of the reciprocating movement of the support frame 6 was set to be the same as the distance between one hanger 5 and the adjacent hanger.) Meanwhile, the support frame 6 started reciprocating. At the same time, the plasma generator is activated, and the plasma gas supplied therefrom is injected into the storage chamber 1 from the injection ports 17 of the two plasma injection tubes 3a and 3b via the introduction pipe 4. Also, at this time, the pulp 7 provided at the exhaust port 2
is slightly opened to prevent the pressure from rising due to the injection of plasma gas and maintain the inside of the storage chamber 1 at a predetermined pressure.

In this way, in the plasma processing apparatus of this example,
Since a configuration is adopted in which each hanger 5 attached to the support frame 6 is reciprocated in the longitudinal direction of the storage chamber 1, the plasma gas injected from the two plasma injection tubes 3a and 3b is transferred to each hanger. The bumper B subjected to IHI at 5 is uniformly irradiated, and the irradiation of the plasma gas is not obstructed by other hangers as in conventional rotary plasma processing apparatuses. Therefore, the entire surface to be treated of the bumper B placed on each hanger 5 is plasma-treated continuously and uniformly in a short time, and the treatment efficiency is significantly improved.

Note that the present invention is not limited to the above-mentioned embodiments, and includes, for example, (1) the number and shape of hangers attached to the support frame, the number and arrangement of plasma irradiation tubes, or the stroke when reciprocating the support frame; etc., as appropriate.

■The direction of reciprocating motion is not limited to the left and right direction,
To make it possible to reciprocate back and forth or up and down. ■To make it possible to reciprocate not only in the left and right directions but also in the front and back and up and down directions at the same time by providing multiple drive devices within the scope of the idea. Detailed specifications can be changed freely.

Effects of the Invention As detailed above, the plasma processing apparatus of the present invention is provided with a support frame that supports a plurality of hangers so as to be movable back and forth, so that plasma gas is continuously applied to the treatment surface of each article to be coated. is irradiated, making it possible to perform uniform plasma treatment in a short time even on large molded items such as bumpers, making it possible to treat not only bumpers but also various synthetic resin molded items. This is an excellent invention that can be applied.

[Brief explanation of drawings]

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 main part of FIG. 1, and FIG.
The figure is an enlarged perspective view showing the end of the hanger, and FIG. 4 is a perspective view showing the rotating device section of a conventional plasma processing apparatus. 1... Containment chamber, 3a, 3b... Plasma injection tube, 5...
Hanger, 6. Support frame, B. Synthetic resin bumper. Patent applicant Toyoda Gosei Co., Ltd. agent
Patent Attorney Hironobu Onda Figure 3 Drawing No. 3 Figure 4 Drawing No. 4

Claims (1)

[Claims] 1. A storage chamber (1) that accommodates objects to be painted such as synthetic resin bumpers (B), a plasma injection pipe (3) that injects plasma gas into the storage chamber (1), and a storage chamber (1) In a plasma processing apparatus equipped with an exhaust port (2) for reducing the pressure inside, and a plurality of hangers (5) on which objects to be coated are placed, a support frame (6) that supports the plurality of hangers (5) is provided. ) is provided so as to be movable back and forth.