JPS62179534A - Corona discharge treatment apparatus - Google Patents

Abstract

PURPOSE:To perform uniform discharge treatment, by performing the treatment while moving a discharge electrode relative to the surface of a resin molding to be treated and at the same time keeping the distance between the both constant by providing the discharge electrode with a distance-regulating member. CONSTITUTION:A transfer means C for moving a discharge electrode 50 which generates a corona discharge relative to three-dimensional resin molding 1 while the distance between the discharge electrode 50 and the surface of the resin molding 1 to be treated is being kept nearly constant is provided. A distance regulating member 53 which extends toward the surface to be treated is provided on the discharge electrode 50 or a member connected therewith. The corona discharge treatment is performed while the molding 1 is moved relative to the discharge electrode 50 with the distance therebetween being kept nearly constant. When the distance is shorter than the standard due to deformation, etc., of the molding 1, the distance regulating member 53 abuts against the surface to be treated and pushed up the discharge electrode 50 to regulate the distance and keep the power of discharge constant.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to an apparatus used for corona discharge treatment of three-dimensional resin molded articles.

(Prior art and problems to be solved by the invention) Modifying treatments for increasing the adhesion of paints, adhesives, printing agents, etc. to polyolefin resins include flame treatment, acid solution treatment, plasma treatment, corona treatment, etc. There are various methods other than discharge treatment.

Among these, plasma treatment has the advantage of being able to simultaneously modify the treated surface of a three-dimensional resin molded product, but it requires large-scale equipment such as a vacuum chamber and vacuum pump, and There is a problem that it takes time to reduce the pressure.

In this respect, corona discharge treatment, which does not require a vacuum chamber or the like, is very advantageous, but corona treatment has a limitation in that the discharge electrode and the surface to be treated must be kept close to each other at all times.

Therefore, conventionally, corona discharge treatment has been carried out only on film-like or flat-shaped resin products (these are called two-dimensional resin products), and on resin products with three-dimensional irregularities on the surface to be treated (these are There are no reports or documents that indicate that this method has been applied to three-dimensional resin molded products.

If corona discharge treatment of three-dimensional resin molded products were to be realized now, there would be significant benefits in terms of equipment costs and treatment time, but several problems must be resolved. One of them is unevenness in the reforming state. That is, since the surface to be treated of a three-dimensional resin molded product has irregularities, the distance between the discharge electrode for corona discharge treatment and the surface to be treated tends to change. If this distance is short, the discharge output will be high, and if the distance is short, the discharge output will be low, so there is a risk that the modified state will be uneven depending on the portion of the surface to be treated.

The purpose of the present invention is to solve the problem of uneven modification, realize corona discharge treatment of three-dimensional resin molded products, and provide a corona discharge treatment device that can uniformly modify the entire surface to be treated. Our goal is to provide the following.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the corona discharge treatment apparatus of the present invention has a structure in which a discharge electrode that generates corona discharge and a surface to be treated of a three-dimensional resin molded product are connected. A moving means is provided to relatively move the discharge electrode and the three-dimensional resin molded product while keeping the distance substantially constant, and a distance regulating member is provided on the discharge electrode or a member connected thereto, and extends toward the surface to be treated. We took the step of setting up a .

(Function) When the moving means operates, the discharge electrode and the three-dimensional resin molded product move relative to each other. Further, when a high frequency is applied to the discharge electrode, a corona discharge occurs, and the surface to be treated of the three-dimensional resin molded product is sequentially subjected to the corona discharge treatment as the relative movement occurs.

At this time, the moving means maintains a substantially constant distance between the discharge electrode and the surface to be treated of the three-dimensional resin molded product, so that the discharge output is kept substantially constant.

However, three-dimensional resin molded products have some degree of dimensional error, and curve deformation may occur after molding. Therefore, the distance between the discharge electrode and the surface to be treated of the three-dimensional resin molded product changes minutely regardless of the moving means, and the discharge output also changes to some extent.

However, even if the distance changes minutely in this way, in the present invention, the distance regulating member provided on the discharge electrode or a member connected thereto keeps the discharge output constant.

In other words, if the distance between the discharge electrode and the surface to be treated of the three-dimensional resin molded product begins to become shorter than the standard, the tip of the distance regulating member will come into contact with the surface to be treated, so the distance must be regulated so that it does not become shorter than the standard. be done.

Therefore, the discharge output does not increase and is controlled to the reference output.

Therefore, the surface to be treated of the three-dimensional resin molded product is evenly and uniformly modified by the corona discharge treatment, and the adhesion of paints, adhesives, printing agents, etc. is improved.

Moreover, since the distance regulating member can be used as a reference for teaching the moving means, the teaching can be performed easily and quickly.

(Example) Hereinafter, an example embodying the present invention will be described with reference to the drawings.

As shown in FIG. 3, the three-dimensional resin molded product subjected to corona discharge treatment in this example is an automobile instrument panel pad (
(hereinafter abbreviated as an instrument panel pad) 1, and an instrument panel is constructed by adhering a skin sheet made of PvC resin or the like to the surface thereof.

The instrument panel pad 1 has a top surface 2, a front surface 3, and a side surface 4.
is the surface to be treated by corona discharge treatment, and has convex corner portions 5 at each portion.

Further, as shown in FIGS. 3 and 8, two shallow dish portions 6 and 7 are provided on the left and right sides of the upper surface 2 of the instrument panel pad, and a convex corner portion 8 is provided on the upper edge of the dish, and a convex corner portion 8 is provided on the bottom edge of the upper surface of the instrument panel pad. A concave corner portion 9 is present in each case.

Roughly speaking, a side defroster air outlet 10 is formed at the left end of the upper surface 2, and two ventilation/air conditioning air outlets 11 and 12 are formed through the left and right sides of the front surface 3, respectively. It has corner portions 13 at each of the four corners. The radius of the corner portions 5, 8, 9, and 13 is 6 to 15#l#l.

Next, a device for subjecting the instrument panel pad 1 to corona discharge treatment will be described.

This corona discharge treatment equipment has two front and rear parts with a metal frame.
It is installed on a base 80 formed in stages, and the device is divided into:
and B; a discharge electrode means B that includes a discharge electrode 50 that generates corona discharge, and a distance regulating member 53 that extends toward the surface to be treated; And C:ti! A means for relatively moving the discharge electrode 50 and the instrument panel pad 1 while keeping the distance between the i-electrode 50 and the treated surface of the instrument panel pad 1 substantially constant,
moving means C installed on the second stage of the base 80; D; means for applying high frequency to the discharge electrode 50, and high frequency applying means installed on the shelf 14 on the left side of the base 80; and a control unit E installed on the right side of the base 80 for controlling the moving means C.

Hereinafter, the details of each part A to E will be explained in order.

[Counter Electrode Means A1 As shown in FIGS. 1.4 and 5.8, a hollow electrode stand 61 is installed on the first stage of the base 80.

A shell-shaped electrode base material 62 formed of epoxy resin into a shape matching the three-dimensional shape inside the instrument panel pad 1 is supported on the upper part of the electrode stand 61, so as to support the instrument panel pad 1 from the inside. It has become.

A thin film-like counter electrode 63 (counter electrode) is coated on the surface of the electrode base material 62 at a portion corresponding to the inner surface of the instrument panel pad 1 by a metal plating method. It is designed to allow contact with the inner surface.

Further, as shown in FIG. 4.8, a recess 64 is formed in the electrode base material 62 at a location corresponding to the air outlet 10, 11.12 of the instrument panel pad 1, and the counter electrode 63 is inserted into the recess 64. A coating is formed on the surface.

A buffer member 65 made of a dielectric material such as Hypalon rubber or epoxy resin is fitted into the recess 64 and covers the counter electrode 63 within the recess 64 . Therefore, when the instrument panel pad 1 is fitted to the counter electrode 63 and a discharge electrode, which will be described later, approaches, the counter electrode 6 in the recess 64
3 is not exposed to the counter electrode through the air outlet 10.11.12.

This is because if the counter electrode 63 is exposed to the discharge electrode, corona discharge will be disturbed or spark discharge will occur between both electrodes.

Discharge electrode means B] As shown in FIGS. 1.2 and 5.8, the discharge electrode means B is provided above the counter electrode 63, and is connected to the moving means C described later.
It is attached to the Z-axis arm 43 of.

That is, the discharge electrode 50 disposed in the atmosphere includes a rod-shaped extension portion 51 made of stainless steel and having a diameter of about 2 m;
It consists of a spherical discharge tip 52, which is also made of stainless steel and has a diameter of about 6 am and is attached to the tip of the extension 51.

A rod-shaped distance regulating member 53 made of non-conductive ceramics is attached to the lower end of the discharge tip 52 and extends toward the surface to be treated. The protruding length of this distance regulating member 53 is 10 #I, so that the distance between the discharge electrode 50 and the surface to be treated does not become shorter than the standard 10 m.

Further, an expanded diameter portion 54 is formed at the base end portion of the extension portion 51;
The proximal end is slidably and non-manipulably inserted into the support case 55. A coil spring 56 is installed in a compressed state between the upper inner surface of the support case 55 and the expanded diameter portion 54, and urges the discharge electrode 50 downward.

Note that a high frequency wave is applied to the discharge electrode 50 via the coil spring 56 from a high frequency applying means to be described later.

[Moving means C] As shown in Figure 1.5.6, the moving means C is the same as the X-axis moving means 20 for moving the corona discharge electrode 50 in the X-axis (left and right) direction. ) direction, and a Z-axis moving means 40, which also moves in the Z-axis (vertical) direction.

In the X-axis moving means 20, two guide rods 28 extending in parallel in the horizontal direction are attached to the base 80.

A turntable 26 for supporting the next Y-axis moving means 30 is provided on the guide rod 28 so as to be slidable in the X-axis direction. That is, a support member 23 is attached to the lower surface of the turntable 26, and both guide rods 28 are inserted through the support member 23, so that the turntable 26 can slide.

Further, the support member 23 on the lower surface of the turntable 26
A screw portion 29 is attached to the left and right sides of the screw portion 29, and one screw shaft 27 is screwed into and retractably from the screw portion 29. A gear 21a is attached to the right end of the screw shaft 27, and the gear 21a meshes with a gear 21b of a servo motor 25 attached to the right end of the base 8O.

Therefore, when the servo motor 25 rotates, the gear 21a,
Since the screw shaft 27 rotates via the screw shaft 21b, the turntable 26 moves in the X-axis direction together with the threaded portion 29 threaded onto the screw shaft 27.

Next, in the Y-axis moving means 30, the turntable 26
Two bearings 35 are provided on each side of the top surface. Two screw shafts 31 are rotatably but non-moveably attached between the left and right bearings 35, and both shafts 31 extend in parallel in the horizontal direction. A gear 36 is provided at the rear end of each screw shaft 31.
a is attached, and each gear 36a is meshed with a gear 36b of a servo motor 32 attached to the rear end of the base 80.

A threaded member 34 spanning both shafts 31 is threaded onto the two screw shafts 31, and a rear end of a Y-axis arm 33 extending forward is attached to the center of the threaded member 34. The next Z-axis moving means 40 is fixed to the front end of the Y-axis arm 33.

Therefore, also in the Y-axis moving means 30, the servo motor 32
The rotation is transmitted to the gear 36, the screw shaft 31, and the threaded member 34 in this order, so that the Z-axis moving means 40 moves in the Y-axis direction.

Next, in the Z-axis moving means 40, a fixed table 41 is fixed to the front end of the Y-axis arm 33 so as to stand vertically. There are two guide rods 42 on the front of the fixed table 41.
are fixed, and both rods 42 extend in parallel in the vertical direction.

A sliding member 44 that spans both guide rods 42 is slidably attached thereto, and a female thread (not shown) is formed in the center of the sliding member 44 . A screw shaft 46 extending upward is screwed into the female screw, and the screw shaft 46
is directly connected to a rotating shaft 47 of a servo motor 45 attached to the upper part of the fixed table 41.

On the other hand, in the center of the sliding member 44, there is a Z axis 7- extending downward.
A Z-axis arm 43 is fixed at its upper end, and the Z-axis arm 4
A support case 55 for the discharge electrode 50 is held in a substantially vertical position at the lower end of the discharge electrode 3 .

Therefore, when the servo motor 45 is rotated, the screw shaft 46 is rotated, and the Z-axis arm 43 and the discharge electrode 50 are moved up and down via the sliding part 044.

[High frequency application means D] As shown in FIGS. 1 and 7, a high frequency application means consisting of a high frequency oscillator 16 and a high voltage transformer 17 is connected to the opposing electrode 63 and the discharge electrode 50.

High frequency oscillator 16 has a frequency of 20 to 39kHz, maximum output 3
A Tantic product (product number HVO5-2>) that generates a high frequency of 50 W is used.

The high voltage transformer 17 is for boosting the high frequency output of the high frequency oscillator 6 and applying a high voltage between the electrodes 63 and 50.

[Control Unit E] A control circuit (not shown) using a computer or the like is incorporated in the control unit E, and the control circuit includes: 1. The distance between the heavy electrode 50 and the surface to be treated of the instrument panel pad 1 is approximately An exercise program that controls the operation of the x, y, and z axis moving means 20, 30, 40 so as to move the discharge electrode 50 while keeping it constant, and (1) controlling the start and stop of the operation of the high frequency application means. The programs etc. to be used are taught in advance.

These programs, especially the former program, can be easily taught using the distance regulating member 53 as a reference. That is, even if there is some error in the teaching, the distance regulating member 53 keeps the distance between the discharge electrode 50 and the surface to be processed constant, so that this teaching may be rough. Therefore, although this type of teaching generally takes an extremely long time, this embodiment can significantly shorten this time.

As shown in FIGS. 1 and 5, at a position behind the counter electrode means A in the base 80, there is an exhaust means F for exhausting gas such as ozone generated during the corona discharge treatment.
is installed.

Now, a method for corona discharge treatment of the instrument panel pad 1 using the corona discharge treatment apparatus configured as described above will be described.

First, if the molded instrument panel pad 1 is contaminated with mold release agent or dirt caused by manual work, it is recommended to clean it with a solvent such as trichloroethane to ensure corona discharge treatment. desirable.

Next, as shown in FIG. 1.4.5.8, the instrument panel pad 1 is attached to the electrode base material 62 and the counter electrode 63 of the counter electrode means A.
mate. At this time, since the surface or the entire surface of the counter electrode 63 is formed to have approximately the same three-dimensional shape as the back side of the instrument panel pad 1, almost the entire surface of the counter electrode 63 covers the entire back surface of the instrument panel pad 1. Contact.

Therefore, the instrument panel pad 1 is electrically effectively coupled to the counter electrode 63, and corona discharge is likely to occur from the discharge electrode 50.

Next, after operating the exhaust means F, the control unit E is turned on, and the moving means 20, 30, 40 of each axis in the moving means C are set to the start position of the corona discharge treatment. At this time, the extending portion 51 of the discharge electrode 50 is always supported in a vertical state, and the discharge tip portion 52 is positioned above the left end of the front edge of the instrument panel pad 1 at an interval of approximately 10 m.

Next, when the high frequency application means is activated, the counter electrode 63
A high frequency of 28 kV is applied between the discharge electrode 50 and the discharge electrode 50.

Then, corona discharge occurs in the atmosphere between the part of the discharge tip 52 facing the upper surface 2 and the upper surface 2,
Corona discharge treatment of the upper surface 2 is started.

The X, Y, Zidl moving means 20, 30.40 are moved in the respective directions by the rotation of the ribo motors 25, 32.45 operated based on control signals from the control unit E, and the discharge electrode 50 is It moves near the surface to be processed.

The discharge electrode 50 moves in the following manner.

■ From instrument panel pad 1 @μ (/J ILIla
D”3 Move to the right to the right pant.

■ Next, it moves slightly backwards and is located to the right of the right side surface 4 of the instrument panel pad 1, rises above the right edge of the front surface 3, moves to the left above the left edge of the front surface 3, and then moves to the left side. Side 4
It moves in a kuji-like manner by descending again to the left of .

■ Roughly move slightly backwards, as shown in Figure 8.
It moves in a straight line shape, rising above the left end of the top surface 2, moving rightward above the right end of the top surface 2, and descending again to the right of the right side surface 4.

■Furthermore, while moving backwards, move back and forth in a zero-shape.

When moving the discharge electrode 50 as described above, the moving means C
As a result, the distance between the discharge electrode 50 and the surface to be treated of the instrument panel pad 1 is maintained at a substantially constant distance of 10M. For example, the 8th
As shown in the figure, the discharge electrode 50 is connected to the air outlet 10, 11.1.
When the discharge electrode 50 passes above the air outlet 2 and the trays 6 and 7, the discharge electrode 50 is moved downward by the recess of the outlet and the trays.

Therefore, the discharge output from the discharge electrode 50 is kept substantially constant over the entire surface to be treated of the instrument panel pad, and a substantially uniform modification effect can be obtained.

However, the instrument panel pad 1 has dimensional errors and may undergo curved deformation after molding.

Therefore, the distance between the discharge electrode 50 and the surface to be treated of the instrument panel pad 1 changes finely despite the moving means C,
The discharge output will also change to some extent.

However, even if the distance changes minutely like this, in this embodiment, the distance regulating member 53 provided on the discharge electrode 50 keeps the discharge output constant.

That is, when the distance between the discharge electrode 50 and the surface to be treated of the instrument panel pad 1 begins to become shorter than the standard 10 m++, the tip of the distance regulating member 53 comes into contact with the surface to be treated, and the discharge electrode 5
In order to push up 0, the distance is restricted to at least 107101. Therefore, the discharge output does not increase and is controlled to the reference output.

In this embodiment, when the distance regulating member 53 pushes up the discharge electrode 50 as described above, the base end of the extension part 51 resists the elastic force of the coil spring 56 and pushes up the support case 5.
5, the support case 55 itself does not move upward. That is, since fluctuations in the discharge electrode 50 are absorbed within the support case, no unreasonable force is applied to the moving means B.

Due to the corona discharge accompanied by the above-described reciprocating movement, the treated surface of the instrument panel pad 1 is evenly and uniformly modified, and the adhesion of paint, adhesive, printing agent, etc. is improved.

Note that the moving speed of the discharge electrode 50 is 1 under the above discharge conditions.
Although it can be arbitrarily set within the range of ~250 m/Sea, it was set to 150 m/sec in this example.

According to this moving speed, one instrument panel pad 1 can be
It can be processed in 0 seconds.

In this embodiment, since the discharge tip 52 has a curved shape, it has the advantage of being less susceptible to changes in the potential distribution at the corner parts 5, 8, 9, 13, the angle of the surface to be treated with respect to the discharge direction, etc. There is also.

It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiments, and may be modified and embodied as desired without departing from the spirit of the invention, for example, as described below.

(1) X-, Y-, and Z-axis moving means 20 in moving means C
．． It is also possible to change the structures of 30 and 40, or to use an articulated robot or the like instead.

(2) Furthermore, in the above embodiment, the discharge electrode 50 is provided with a moving means C@ to move the discharge electrode 50, but the counter electrode means A is provided with a moving mechanism to move the instrument panel pad 1. You may also do so. In short, the moving means may be one that moves the discharge electrode 50 and the instrument panel pad 1 relative to each other while keeping the distance between the discharge electrode 50 and the treated surface of the instrument panel pad 1 substantially constant.

(3) The configuration of the distance regulating member 53 can also be changed. For example, instead of ceramics, it may be made of a synthetic resin with excellent heat resistance such as polyimide resin, or a material similar thereto.

Moreover, if a roller is rotatably attached to the tip of the distance regulating member 53, the resistance when it comes into contact with the surface to be processed can be reduced.

Roughly speaking, in the above embodiment, the distance regulating member 53 is connected to the discharge electrode 5.
Although it is attached to the tip of the discharge electrode 50, it is not necessarily necessary to attach it directly to the discharge electrode 50, and it may be attached to another member connected to the discharge electrode 50.

(4) The shape of the discharge tip 52 of the discharge electrode 50 is not limited to a sphere, but may be a hemisphere, a spheroid, or the like, as long as at least the discharge tip has a curved shape. play. However, from the viewpoint of uniformity of corona discharge, especially when the discharge electrode is moved without tilting with respect to the surface to be treated as in the above example, a spherical shape is considered to be optimal. .

(5) Furthermore, as the discharge electrode, a rod-shaped or planar electrode that approaches the surface to be treated of the resin molded product in a substantially parallel manner can also be used. When the surface to be treated has a simple shape or shallow irregularities, the time required for corona discharge treatment can be significantly shortened by using these rod-shaped or planar electrodes.

Furthermore, the treatment using the discharge electrode 50 of the embodiment described above and the treatment using a rod-shaped or planar discharge electrode can be combined as appropriate.

(6) In addition to the above-mentioned instrument panel pad 1, the present invention is applicable to automobile bumpers, automobile moldings, mudguard fenders for automobiles, various industrial equipment, household goods, etc., which require painting, adhesion, printing, etc. after molding. All three-dimensional resin molded products can be subjected to corona discharge treatment.

Effects of the Invention As detailed above, according to the corona discharge treatment apparatus of the present invention, the treated surface of a three-dimensional resin molded article can be evenly and uniformly modified, and paints, adhesives, printing agents, etc. Not only can the adhesion of the material be uniformly improved, but also the teaching of the moving means can be performed easily and quickly, which is an excellent effect.

[Brief explanation of drawings]

Each figure shows an embodiment embodying the present invention. FIG. 1 is a front view of a corona discharge treatment device, FIG. 2 is a sectional view of the discharge electrode means, etc., FIG. 3 is a perspective view of the instrument panel pad, and FIG. The figure is a sectional view showing the instrument panel pad and counter electrode means cut back and forth, Figure 5 is a right side view of the corona discharge treatment device, Figure 6 is a plan view of the Y-axis moving means, and Figure 7 is the high frequency application means. and a block diagram of the electrodes. FIG. 8 is a sectional view showing the instrument panel pad and the counter electrode means cut left and right, and also showing a method of moving the discharge electrode. DESCRIPTION OF SYMBOLS 1...Instrument panel pad, 50...tli electric electrode 3...Distance regulation member, C...Transportation means.

Claims (1)

[Claims] 1. While keeping the distance between the discharge electrode (50) that produces corona discharge and the surface to be treated of the three-dimensional resin molded product (1) almost constant, the discharge electrode (50) and the three-dimensional resin A moving means (C) for relatively moving the molded product (1) is provided, and a distance regulating member (53) extending toward the surface to be treated is provided on the discharge electrode (50) or a member connected thereto. A corona discharge treatment device characterized by: 2. The corona discharge treatment apparatus according to claim 1, wherein the moving means (C) is provided on a discharge electrode (50). 3. The corona discharge treatment apparatus according to claim 1, wherein the distance regulating member (53) is a non-conductive rod-shaped body attached to the tip of the discharge electrode (50).