JPH0615625B2 - Electric discharge treatment equipment for resin molded products - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric discharge treatment apparatus for resin molded products.

(Prior Art) In general, highly crystalline and non-polar resins such as PP (polypropylene) and PE (polyethylene) are superior in terms of quality and cost, but on the other hand, they are difficult to be coated with a solvent or the like and difficult to coat. ing. Particularly in automobiles, the polypropylene has been used for many parts including bumpers in view of the above advantages for several years. Further, recently, there is an increasing need for coating the external member such as the bumper with the same color as the body color.

Therefore, in order to improve the above-mentioned drawback of poor paintability, a so-called two-coat, two-bake treatment has been widely used in which a primer such as chlorinated polypropylene is applied between the base material polypropylene and the coating top coating agent. There is.

On the other hand, recently, in order to improve these two coats to one coat, a plasma discharge treatment for imparting a polar group (carbonyl group etc.) to the base polypropylene has attracted attention and has been partially utilized.

This plasma contains a radio wave (13,
56 MHZ) or microwave (2450 MHZ) energy is used to activate oxygen gas to modify the surface of the substrate, and a high voltage is applied between the electrodes at atmospheric pressure to discharge in the air (corona discharge). There are two methods of performing atmospheric pressure treatment.

The vacuum processing method has advantages such as a long plasma life and stable processing, but on the other hand, there is a time loss due to vacuum evacuation, and a batch processing method leaves a problem in production technology.

In addition, the atmospheric pressure method is simpler in equipment than the vacuum processing method,
Although there are advantages such as easy continuous processing, it is necessary to keep a narrow gap (eg, 1 to 8 mm) between the narrow electrodes, and up to now, the processing has been limited to a sheet or film.

Therefore, in order to eliminate these drawbacks of the atmospheric pressure method, there has been proposed an electric discharge treatment device in which a flexible electrode having a scalloped shape is used and a constant gap is maintained according to the external shape of the molded body (for example, Japanese Patent Publication No. 60-46133 gazette).

More specifically, this conventional technique has an irregular shaped molded body having an outer shape corresponding to the inner shape thereof.
And is fitted and held by a base electrode which is movable in a predetermined direction, and a flexible sagging reverse electrode is provided above the base electrode through the molded body, and the sagging reverse electrode is formed into an external shape of the molded body. By relatively performing relative movement, the corona discharge is performed while keeping the gap value between the base electrode and the counter electrode constant regardless of the shape of the molded body.

(Problems to be Solved by the Invention) However, when the flexible back electrode having a scalloped shape is adopted as in this conventional technique, the following problem occurs on the other hand.

That is, since the above-mentioned sag-shaped electrode only contacts the discharge-treated surface of the molded product in a state of being sagged due to its weight, the contact state is not always good, and it is easy to get caught in the protrusion of the molded product for uniform discharge. It is difficult to process. Also,
Since the gap value fluctuates due to the swinging of the electrode in the drooping state, there is a problem that a part in an undischarged state is generated and uniform discharge processing cannot be performed.

(Means for Solving Problems) The present invention has been made for the purpose of solving the above problems, and the resin molding is applied to a base electrode having a shape corresponding to the shape of one side surface of the resin molded product. In the electric discharge processing device for a resin molded product, the product is fitted and the opposite electrode is oppositely placed on the other side of the resin molded product so that the resin molded product is discharged. The electrode is composed of a plurality of rod-shaped electrodes that are supported so as to be retractable according to the shape of the other side surface portion of the resin molded product.

(Operation) According to the above-mentioned means, the reverse electrode corresponding to the shape of the other side surface of the resin molded product is composed of a plurality of rod-shaped electrodes, and the rod-shaped electrode is formed according to the other side surface shape of the resin molded product. Since the electrodes are opposed to each other, the counter electrode is in a good state and a certain gap can be maintained with certainty, and a uniform discharge treatment can be performed.

(Embodiment) FIG. 1 and FIG. 2 show an electric discharge treatment apparatus for resin molded products according to an embodiment of the present invention.

First, in FIG. 1, reference numeral 1 has an outer surface corresponding to the inner shape of a resin (polypropylene) automobile bumper 2 as a molded body as shown in FIG. 2, for example (-).
It is a side base electrode (holding electrode), and the bumper 2 is mounted on the base electrode 1 in a fitted state as shown in the drawing.

Next, first, reference numeral 3 is located above the bumper 2,
The plurality of first rod-shaped electrode members 4, 4, ...
Is a (+) side first reverse electrode which is capable of contacting with each part of the outer surface of the upper surface of the first reverse electrode 3, and the first reverse electrode 3 holds the plurality of first rod-shaped electrode members 4, 4 ,. By supporting the outer surface of the bumper 2 so as to be retractable by the member 5, one end side P ₁ point of the bumper 2 to the other end side P ₂
The bumper 2 is arranged so as to extend along the outer surface of the bumper 2 between the points. Then, while maintaining a constant gap G ₁ between the counter electrode 3 and the base electrode 1, a corona discharge is generated over the entire surface, and the upper coated surface side of the bumper 2 is discharged. Further, reference numeral 30 is a high-frequency voltage generator for applying a high-frequency voltage of a predetermined voltage value or more to the base electrode 1 and the opposite electrode 3 side in order to perform this discharge.

In this case, as shown in detail in FIG. 1, for example, the holding member 5 includes a holding frame 7 having a substantially U-shaped cross section and extending between the upper and lower sides of the holding frame 7 in the width direction of the bumper 2. A movable member 10 which is slidably inserted into the movable cylinder 10 and whose non-inserted end side is connected to the tip of the movable rod member 9 of the operating cylinder 8. The plurality of first rod-shaped electrode members 4, 4 are inserted in loose fitting states into fitting insertion holes 7a formed at predetermined intervals in the longitudinal direction of both upper and lower sides of the holding frame 7 and are supported so as to be movable up and down. The corresponding fitting holes 10a, 1 of the movable member 10
It is also inserted and supported in 0a. Then, in the position state of the movable member 10 in which the central axes of the two kinds of through holes 7a, 7a ... And 10a, 10a .. coincide with each other in the vertical direction, the plurality of rod-shaped electrode members 4, 4 ... And the contact state along the outer surface of the bumper 2 is maintained and the operating cylinder 8 is driven in this state to move the movable member 10 by a predetermined minute distance in the arrow (a) direction, for example. When kept in the urging state, the first rod-shaped electrode members 4, 4, ... Are locked to the holding member 5 in a state of being held by the outer surface of the bumper 2. In this locked state, the holding member 5 is lifted upward and fixed by a predetermined gap amount by a predetermined gap amount G ₁ to form a dischargeable state. Then, in this state, the discharge process is performed as described above.

On the other hand, reference numerals 12 and 13 denote substantially the same first reverse electrodes 3 for performing discharge processing on both side surface portions (upper and lower edge portions in the case of a product) of the bumper 2 similar to second and third electrodes. A plurality of second and third rod-shaped electrode members 14, 14, ..., 15, 15, ... Which are reverse electrodes and extend in the horizontal direction, and these second and third electrodes.
., 15, 15, .., and second and third holding members 16 and 17, which hold the rod-shaped electrode members 14, 14 ,. , 20 to temporarily contact the rod-shaped electrode members 14, 14, ..., 15, 15 ... Corresponding to the outer shapes of the respective side surfaces of the bumper 2, and then to a predetermined gap G ₂ (where G ₁ = The same discharge state as that in the case of the first counter electrode 3 is formed by separating only G ₂ ).

(Effects of the Invention) As described above, the present invention allows the above resin molded product to be fitted to the base electrode having a shape corresponding to the shape of one side surface of the resin molded product, and the other side surface of the resin molded product. In the electric discharge device of the resin molded product, which is configured to perform the electric discharge treatment on the resin molded product by counter electrode the opposite electrode in the opposite direction to the side, the reverse electrode is the other side surface part of the resin molded product. It is characterized by being constituted by a plurality of rod-shaped electrodes that are supported so as to be able to project and retract according to their shapes.

Therefore, according to the present invention, the reverse electrode corresponding to the shape of the other side surface of the resin molded product is constituted by a plurality of rod-shaped electrodes,
Since the rod-shaped electrode is adapted to project and retract depending on the shape of the other side surface of the resin molded product, the counter electrode state is good, and a certain gap can be maintained reliably, and uniform discharge treatment is possible. can do.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an electric discharge treatment apparatus for a resin molded product according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the structure of an automobile bumper as an electric discharge treatment target in the above-mentioned embodiment apparatus. . DESCRIPTION OF SYMBOLS 1 ... Base electrode 2 ... Automotive bumper 3 ... 1st reverse electrode 4 ... 1st rod-shaped electrode member 12 ... 2nd reverse electrode 13 ... 3rd reverse electrode 14 ... 2nd Rod-shaped electrode member 15 ... Third rod-shaped electrode member

Claims (1)

[Claims] 1. A resin molded product is fitted to a base electrode having a shape corresponding to the shape of one side surface of the resin molded product, and a counter electrode is oppositely poled to the other side surface side of the resin molded product. As a result, in the electric discharge processing device for a resin molded product, which is configured to perform the electric discharge treatment on the resin molded product, the reverse electrodes are plurally supported by the other side surface portion of the resin molded product so as to be retractable in accordance with the shape. An electric discharge processing apparatus for a resin molded product, characterized in that it is constituted by a bar-shaped electrode.