JPH0343297B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a method for modifying the surface of a resin molded article by corona discharge treatment, and a corona discharge treatment apparatus used in the method. relates to a corona discharge treatment method and apparatus for a three-dimensional resin molded article having a corner portion.

(Prior Art) Since polyolefin resins such as polypropylene have few polar groups, they have the characteristic that paints, adhesives, printing agents, etc. are difficult to adhere to their surfaces. Therefore, when painting, adhering, printing, etc. are performed on the surface of the resin, it is necessary to perform a modification treatment on the surface as a pretreatment to improve the adhesion.

Traditionally, flame treatment and acid solution treatment using dichromic acid solution have been used as modification treatments for three-dimensional resin molded products made of polyolefin resin, but recently plasma treatment has also been used. I started to get angry. Since the plasma treatment can activate almost the entire surface of a resin molded product at once, it has achieved great results in pre-painting and adhesion treatment of automobile bumpers, moldings, etc.

(Problem to be Solved by the Invention) However, since the plasma processing requires a plasma gas atmosphere under reduced pressure, large-scale and expensive equipment such as a vacuum chamber, a vacuum pump, a valve mechanism, and a carrier gas are required. There was a problem that it took time to reduce the pressure inside the tank. Furthermore, since the process inevitably requires batch processing, it is difficult to automate the process, and there is also the problem that the vacuum is cut off after each process and it takes time for the next depressurization.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the first invention provides a method for corona discharge treatment of a three-dimensional resin molded product having a corner portion, and a method for corona discharge treatment. A method is adopted in which the electrode is a discharge electrode having a spherical discharge tip, and the discharge electrode is relatively moved along the shape of the molded product while causing a corona discharge in the vicinity of the molded product. The present invention is an apparatus for corona discharge treatment of a three-dimensional resin molded product having a corner portion, which comprises: a jig for fixing the molded product; a discharge electrode having a spherical discharge tip; A device equipped with a movement mechanism for moving the jig three-dimensionally is employed.

(Function) In the first invention, a corona discharge is generated in the atmosphere from a discharge electrode having a spherical discharge tip in the vicinity of a three-dimensional resin molded product having a corner portion. The surface of the resin molded product is activated and modified by the corona discharge treatment, and the adhesion of paints, adhesives, printing, etc. is improved.

Furthermore, although the discharging tip is spherical, the corona discharge is not easily affected by changes in potential at the corner, the angle of the surface to be treated with respect to the discharge direction, and so acts effectively even on the corner. Therefore, not only the flat part of the molded product but also the corner part can be reliably treated with corona discharge.

Furthermore, since the discharge tip is spherical, the corona discharge spreads out from the discharge tip in an extremely uniform discharge pattern. Therefore, the processing range for molded products becomes wider, and the processing efficiency becomes higher.

In the second invention, the jig fixes the three-dimensional resin molded product, and the moving mechanism three-dimensionally moves one or both of the discharge electrode whose discharge tip has a curved surface shape and the jig. . Therefore, the discharge electrode can be moved to any surface of the molded article and performs corona discharge treatment on the surface.

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

The term "three-dimensional resin molded product" as used in the present invention refers to a resin molded product other than planar planar bodies such as resin sheets and flat resin plates, which has three-dimensional irregularities. The three-dimensional resin molded product to be subjected to corona discharge treatment in this example is an automobile instrument panel pad (hereinafter abbreviated as instrument panel pad) 1 molded from PP resin, as shown in FIGS. 1 to 4. The surface is made of polyvinyl chloride (PVC).
The instrument panel is constructed by adhering the skin sheets made by the manufacturer.

The instrument panel pad 1 has convex corner portions 5 at the boundary between the top surface 2 and the front surface 3, the boundary between the top surface 2 and the side surface 4, etc., and the radius of each corner portion 5 is approximately 6.
mm.

In addition, there are 2
Two shallow pans 6, 7 are provided. Therefore,
As shown in FIG. 2, there are convex corner portions 8 on the upper edges of the pans 6 and 7, and concave corner portions 9 on the bottom edges of the pans 3 and 4. The radius of 9 is approximately 6 mm. Further, 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 on both left and right sides of the front surface 3, respectively. Each outlet 10, 11, 12 has a substantially rectangular shape and has corner portions 13 with radiuses of 6 to 15 mm at the edges and four corners.

As mentioned above, the instrument panel pad 1 is a three-dimensional molded product and has many corner parts 5, 8, 9, 1.
It is characterized by having 3.

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

This corona discharge treatment apparatus uses a jig member A for fixing the instrument panel pad 1 (including a moving mechanism of the jig member A and a counter electrode) and a discharge electrode whose discharge portion is rod-shaped. A first processing device B (disposed on the left side in FIG. 1) performs discharge treatment, and a second treatment device C (first (disposed on the right side in the figure) constitutes its main parts.

Hereinafter, the details of each of the sections A to C will be explained in order.

[Jig member A] The jig member A has a base 21, and the base 2
1 is moved arbitrarily on the floor back and forth and left and right by a slide means 26 (normal means such as rails and rollers can be adopted) provided on the floor, and a hydraulic cylinder 27 provided below the base 21. It can be moved up and down arbitrarily by the

As shown in FIGS. 2 and 3, a jig main body 22 formed with epoxy resin in a shape that matches the internal shape of the instrument panel pad 1 is attached to the upper part of the base 21, and the jig main body 22 is attached to the upper part of the base 21. I'm starting to support it. The jig main body 22 can be easily formed into a shell shape by pouring an epoxy resin into the inside of the instrument panel pad 1 and curing it by reaction.

A counter electrode 23 (counter electrode) for corona discharge treatment is plated with metal on the surface of the jig main body 22.
The coating is formed using methods such as vacuum evaporation, sputtering, conductive paint application, and aluminum foil pasting.
The surface of the counter electrode 23 is adapted to substantially come into contact with the inner surface of the instrument panel pad 1.

Note that a recess 24 with a depth of about 6 mm is formed in the jig main body 22 at a location corresponding to the air conditioner outlet 10, 11, 12 of the instrument panel pad 1, and the counter electrode 23 is formed on the surface of the recess 24. At the same time, a buffer plate 25 having a thickness of about 6 mm and made of a dielectric material such as Hypalon rubber or epoxy resin is fitted into the recess 24 to uniformly generate corona discharge. That is, since the air outlets 10, 11, and 12 are through holes, the jig main body 2
When the counter electrode 23 is directly formed at the corresponding location of 2,
This is because the counter electrode 23 is exposed to the discharge electrode described later, and the corona discharge becomes spark-like and disordered.

[First processing device B] The first processing device B has a discharge electrode 31 whose discharge portion is rod-shaped, and moves the discharge electrode 31 to approach the instrument panel pad 1, and further moves it along each surface of the instrument panel pad 1. a moving mechanism 32 for
It is comprised of a high frequency application means 33 for applying high frequency to the opposing electrode 23 and the discharge electrode 31 to generate corona discharge.

The discharge electrode 31 placed in the atmosphere has a diameter of 14 mm.
It is formed by bending a stainless steel rod into a U-shape, and includes, in order from the base end, a gripped portion 34 gripped by the moving mechanism 32, and a rod-shaped discharge portion 35 corresponding approximately parallel to the instrument panel pad 1. , prevents concentration of corona discharge on the tip of the discharge section 35,
The three portions of the end portion 36 are configured to be orthogonal to each other in order to cause a uniform corona discharge throughout the entire portion.

Incidentally, since the radius of the discharge electrode 31 is 7 mm, the main corner portions 5 of the instrument panel pad 1,
It is larger than the radius of 8 and 9 (6 mm).

Further, a computer-controlled robot is used for the moving mechanism 32, and various commercially available industrial robots are applicable (for example, a multi-purpose work robot, model PW-10, manufactured by Hitachi, Ltd.). The moving mechanism 32 of this embodiment is multi-jointed and is constructed as follows. That is, a support base 38 is rotatably attached to the upper part of the base 37, and a first arm 39 and a second arm 39 are attached to the upper part of the support base 38.
The arm 40 is pivoted so that it can rotate independently.

A third arm 4 is provided on each upper part of both arms 39 and 40.
1 is rotatably pivoted at its base end, and a cylindrical acting portion 42 is rotatably pivoted at the tip of the third arm 41 . The action part 42 is formed to be rotatable around its own central axis, and the gripped part 3 of the discharge electrode 31 is attached to the tip of the action part 42 .
A gripping member 43 for gripping 4 is attached.

Note that the rotation of the support base 38, each arm 39~
41, the rotation of the operating part 42, etc. are all controlled by a computer (not shown), and by operating these according to the computer's program, the discharge electrode 31 is attached to the upper surface 2, front surface of the instrument panel pad 1. 3 and side surface 4 to a distance of about 10 mm, and moves along each of these surfaces.

A high frequency oscillator 45 and a high voltage transformer 4 are connected to the opposing electrode 23 and the rod-shaped discharge electrode 31 of the jig member A.
A high frequency applying means 33 consisting of 6 is connected, and the counter electrode 23 is grounded. Further, as a countermeasure against high frequency noise, the high frequency oscillator 45 is also directly grounded.

High frequency oscillator 45 has 20~30KHz, maximum output
A product from Tantek Co., Ltd. (product name HVO5-2) that generates a 350W high frequency is used. The high-voltage transformer 46 is for boosting the high-frequency output of the high-frequency oscillator 45 and applying a high voltage to the electrodes 23 and 31, and is also a product of Tantec Co., Ltd. (trade name: Super C).

Note that the high frequency application means 33 and the moving mechanism 32
It is installed at a considerable distance from the computer control mechanism of the system, and is powered separately and independently. This is to prevent the computer from malfunctioning due to high frequency noise leaking from the high frequency applying means 33. Also, for the same reason, the high frequency oscillator 4
5. The cord connecting the high voltage transformer 46 and the discharge electrode 31 must be reliably shielded.

The second processing device C has a discharge electrode 51 having a spherical discharge tip, moves the discharge electrode 51 to approach the instrument panel pad 1, and moves the discharge electrode 51 three-dimensionally along the shape of the instrument panel pad 1. A moving mechanism 52, and a high frequency applying means 53 for applying high frequency to the opposing electrode 23 and the discharge electrode 51 to generate corona discharge.

The discharge electrode 51 includes a rod-shaped gripped part 54 made of stainless steel and held by a moving mechanism 52 and having a diameter of about 2 mm, and a gripped part 54 also made of stainless steel and attached to the tip of the gripped part 54 and attached to the instrument panel pad 1.
It consists of a spherical discharge portion 55 that corresponds approximately perpendicularly to the air, and is disposed in the atmosphere.

The radius of the sphere of the discharge portion 55 is 2.5 mm, and each corner portion 5, 8, 9, 13 of the instrument panel pad 1 has a radius of 2.5 mm.
It is characterized by being smaller than the round radius (6 to 15 mm).

Note that, as shown in FIG. 6, the discharge electrode 51
It is desirable to provide a mesh-shaped shield cylinder 60 made of stainless steel or the like around the . This is because the shield tube 60 can prevent radiation of high frequency noise during corona discharge.

Furthermore, the moving mechanism 52 is the same as the moving mechanism 32 of the first processing apparatus B.

Therefore, the rotation of the support base 38, each arm 39
41, the rotation of the action part 42, etc. are operated according to the program of a computer (not shown), so that the discharge part 55 of the discharge electrode 51 is connected to the corner parts 5, 8, 9, 13 of the instrument panel pad 1 and the blower. Approximately perpendicular to the cut surface of the outlets 10, 11, 12
It is designed to move three-dimensionally along each of these shapes while approaching the distance of 10 mm.

A high frequency applying means 53 consisting of a high frequency oscillator 56 and a high voltage transformer 57 is connected to the opposing electrode 23 of the jig member A and the discharge electrode 51 having a spherical discharge tip. The same high frequency oscillator 56 and high voltage transformer 57 as those of the first processing device B are used.

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 desirable to perform a pretreatment to clean the dirt with trichloroethane or the like. This is to ensure that corona discharge treatment is performed. However, if there is no mold release agent or dirt, or if there is only slight dirt, there is no need to carry out the pretreatment.

Next, as shown in FIGS. 2 and 3, the instrument panel pad 1 is fitted into the jig main body 22 of the jig member A, and the inner surface of the instrument panel pad 1 is brought into contact with the surface of the counter electrode 23. At this time, due to manufacturing errors in the instrument panel pad 1, some parts may not come into contact with each other, but 2
If the distance is about 3 mm, there will be little effect on corona discharge. Note that the jig member A is moved to a position in front of the first processing device B by the sliding means 26.

Next, the main parts of the instrument panel pad 1 are subjected to corona discharge treatment by the first treatment device B. That is,
When the moving mechanism 32 is operated, the discharge part 35 of the rod-shaped discharge electrode 31 is arranged to extend in the front-rear direction with respect to the upper surface 2 of the instrument panel pad 1, as shown in FIG. 3, and as shown in FIG. The upper surface 2
It is located at an interval of approximately 10 mm above the left end of the

At this time, the high frequency oscillator 45 of the high frequency applying means 33 is activated, its high frequency output is boosted by the high voltage transformer 46, and a high frequency of 28 KV is applied between the counter electrode 23 and the rod-shaped discharge electrode 31. Then, corona discharge occurs in the atmosphere between the portion of the discharge section 35 that faces the upper surface 2 and the upper surface 2, and the corona discharge treatment of the upper surface 2 is started, and the adhesiveness of the adhesive etc. is reduced. improves. The improvement in wettability due to the corona discharge treatment of this example is comparable to that of conventional flame treatment.

The phenomenon of the corona discharge treatment is that a large amount of electron flow caused by the discharge is caused by a synthetic resin (in this example,
This is thought to be because the impact energy partially breaks the bonds between carbon and hydrogen, oxidizes and ionizes the synthetic resin surface, and activates it.

The rod-shaped discharge electrode 31 is gradually moved to the right side of the upper surface 2 by the moving mechanism 32 while generating the corona discharge. This moving speed can be arbitrarily set within the range of 1 to 250 mm/sec under the above-mentioned discharge conditions, but in this example, 150 mm/sec was set in consideration of sufficient processing results and shortening of processing time.
mm/sec.

As the discharge electrode 31 moves, most of the upper surface 2 is subjected to corona discharge treatment.
Areas such as the corner portions 8 and 9 of the dish portions 6 and 7 are difficult to treat. For reasons such as the potential distribution changing in these areas and the surface to be treated being no longer perpendicular to the discharge direction, the corona discharge is pulled to surfaces other than these areas, and the corona discharge does not work effectively. It is thought that this is because of this.

By the way, if the discharge electrode 31 and the counter electrode 23 were to directly face each other when the discharge electrode 31 passes above the blow-off port 10, intense discharge would occur, resulting in product defects. However, in this embodiment, as mentioned above, the buffer plate 2 made of dielectric material
5, the discharge is relaxed and made uniform. Note that in other parts of the upper surface 2, uniform discharge occurs because the instrument panel pad 1 itself is a dielectric and acts as a buffer member.

Now, if a buffer member made of a dielectric material is provided all over the inside of the instrument panel pad 1, the corona discharge will be uniform, but will be weak over the entire surface of the instrument panel pad 1, resulting in a decrease in processing efficiency. In this embodiment, in order to prevent this decrease in efficiency, the buffer plates 25 are installed only inside the air outlets 10 to 12, which are through holes.
It has been established.

After the corona discharge treatment of the upper surface 2 is completed as described above, the discharge electrode 31 is automatically moved by the moving mechanism 32 in the vertical direction with respect to the front surface 3 of the instrument panel pad 1, as shown in FIG. arranged to extend. Subsequently, the discharge electrode 31 is moved from the front left end of the front surface 3 (approximately 10 mm apart, as in the case of the top surface 2) to the front right end while continuing the corona discharge, and the corona discharge of the front surface 3 is continued. Processing takes place.

Note that the cut surfaces and corner portions 13 of the air outlets 11 and 12 are difficult to treat, and when the discharge electrode 31 passes in front of the air outlets 11 and 12, the buffer plate 25
As in the case of the air outlet 10, the corona discharge is maintained uniformly by the action of the air outlet 10.

After the corona discharge treatment of the front surface 3 is completed, the discharge electrode 31 is automatically moved by the moving mechanism 32 and arranged so as to extend vertically with respect to the side surface 4 of the instrument panel pad 1, as shown in FIG. . Subsequently, the discharge electrode 31 is moved from the side of the rear end of the side surface 4 to the side of the front end, and corona discharge treatment of the side surface 4 is performed.

The time required for the entire corona discharge treatment of the top surface 2, front surface 3, and both side surfaces 4 by the first treatment device B is approximately
It is 25 seconds.

In addition, in the above process, the discharge electrode 31 was moved relative to the instrument panel pad 1 only by the moving mechanism 32, but the instrument panel pad 1 may be moved by the slide means 26 and the hydraulic cylinder 27, Both the electrode 31 and the instrument panel pad 1 may be moved.

As described above, the first processing apparatus B eliminates the need for large-scale equipment such as a vacuum chamber, vacuum pump, valve mechanism, carrier gas, etc. and the preparation time required for depressurizing the vacuum chamber in conventional plasma processing. The surface of the PP resin instrument panel pad 1 can be modified simply by generating corona discharge in the atmosphere using a rod-shaped discharge electrode 31 and moving the corona discharge.
Therefore, not only can equipment costs and equipment space be significantly reduced, but processing time can also be shortened.

Furthermore, since the rod-shaped discharge electrode 31 is moved along the surface of the instrument panel pad 1, a wide surface to be treated can be treated at one time, and the treatment efficiency is extremely high.

When the corona discharge treatment by the first treatment device B is completed, the operation of the high frequency oscillator 45 is stopped, the corona discharge is terminated, and the jig member A and the instrument panel pad 1 are moved by the sliding means 26 to the second treatment device. Moved to the front of C.

Subsequently, the corner portions 5, 8, 9, which were not sufficiently subjected to the corona discharge treatment by the first treatment device B,
13 and the like are performed by the second processing device C. That is, the moving mechanism 52 is activated, and the spherical discharge portion 55 of the discharge electrode 51 is positioned at a distance of approximately 10 mm from the corner portion 5 of the instrument panel pad 1, as shown in FIG.

At this time, the high frequency oscillator 56 of the high frequency applying means 53 is activated, and a high frequency of 28 KV is applied between the opposing electrode 23 and the discharge electrode 51, and a corona discharge is generated between the discharge section 55 and the corner section 5.

The corona discharge is caused by a discharge section 55 as shown in FIG.
Since the discharge spreads out in an extremely uniform pattern, the treatment area on the surface of the instrument panel pad 1 at each time is quite wide, and a circle with a diameter of 10 to 15 mm is sufficiently treated. This is because the discharge portion 55 is spherical, and therefore the tip of the discharge is curved, so the corona discharge is uniformly dispersed without concentrating on one point (a sharp part, corner, etc.).

In addition, since the discharge tip has a curved shape, it is less susceptible to changes in the potential distribution at the corner portion 5 and the angle of the surface to be treated with respect to the discharge direction, and the corona discharge also effectively acts on the corner portion 5. do. In particular, since the radius of the discharge portion 55 of the discharge electrode 51 of this embodiment is smaller than the radius of the corner portions 5, 8, 9, and 13, the above-mentioned influence is hardly affected. Therefore, the corner portion 5, which was not sufficiently subjected to the corona discharge treatment by the first treatment device B, is also completely treated here.

The discharge electrode 51 generates corona discharge while
Since it is moved three-dimensionally over all the corner parts 5 by the moving mechanism 52, the corner parts 5 around the entire circumference are completely processed. This moving speed can be arbitrarily set within the range of 1 to 250 mm/sec under the above discharge conditions. In this example, the speed was set at 150 mm/sec in consideration of sufficient processing results and shortening of processing time.

After the treatment of the corner portion 5 is completed, the discharge electrode 51 is automatically moved by the moving mechanism 52 onto the respective corner portions 8 and 9 of the dish portions 6 and 7 as shown in FIG. The parts 8 and 9 are moved three-dimensionally. In particular, since the concave corner portion 9 is hardly treated by the rod-shaped discharge electrode 31 due to the distance between the opposing electrode 23, the spherical discharge electrode 5
1 is effective. After treating the corner portions 8 and 9, the discharge electrode 51 is similarly connected to each outlet 10 and 1.
1 and 12 in order, and their cut surfaces and corner portions 13 are processed.

As described above, it takes about 30 seconds for the entire corona discharge treatment of the corners and the like by the second treatment device C, and the corona discharge ends after the treatment is completed.

In the above process, the discharge electrode 51 was moved relative to the instrument panel pad 1 only by the moving mechanism 52, but the instrument panel pad 1 may be moved by the sliding means 26 and the hydraulic cylinder 27, Both the electrode 51 and the instrument panel pad 1 may be moved. When moving the instrument panel pad 1, it is preferable to configure the instrument panel pad 1 so that it can tilt, since this allows the angle between the discharge electrode 51 and the surface to be treated to be adjusted.

In this way, the second processing device C, like the first processing device B, simply generates a corona discharge in the atmosphere using the discharge electrode 51 and moves it.
The surface of the instrument panel pad 1 can be modified. Therefore, it is possible to save and shorten equipment costs, equipment space, and processing time.

Furthermore, since the discharge electrode 51 whose discharge tip is curved at least is moved along the surface of the instrument panel pad 1, it is possible to reliably treat the corner portions 5, 8, 9, and 13 that are difficult to treat with the rod-shaped electrode 31. can.

As described above, the present embodiment includes short-time processing of the main parts of the instrument panel pad 1 by the first processing device B;
Since the processing of the corner parts 5, 8, 9, and 13 of the instrument panel pad 1 by the second processing device C is combined,
Overall, processing efficiency is extremely high, and processing time can be significantly shortened.

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) Generally, in order to generate a corona discharge, a high frequency voltage or a high voltage is usually applied between two adjacent electrodes (the opposing electrode 23 and the discharge electrodes 31, 51) as in the above embodiment. .

However, by utilizing atmospheric discharge, it is possible to generate corona discharge using only the discharge electrode without using a counter electrode. In particular, in the case of the discharge electrode 51 having the discharge portion 55 at the tip having a spherical shape, the corona discharge is concentrated on the sphere, so it is possible to generate a relatively strong and uniform corona discharge without using the counter electrode 23. can.

Therefore, in the second processing apparatus C, a processing method that does not use the counter electrode 23 is also possible. However, if the counter electrode 23 is used, a stronger discharge can be obtained and the discharge range will be wider.

(2) The processing method by the first processing device B and the processing method by the second processing device C may be performed in the reverse order of the above embodiment, or one or both of the processing methods may be
It can be repeated more than once or in any combination.

(3) It is also possible to treat the entire surface of the instrument panel pad using only the second treatment device C. However, since it is more efficient to use the rod-shaped discharge electrode 31 for the ordinary flat portion of the instrument panel pad 1, the processing time is shortened when the first processing device B is used in combination.

(4) Since corona discharge is affected by ambient temperature and humidity, it is desirable to install the jig member A and devices B and C in a room with constant temperature and humidity.

(5) The high-frequency applying means 33 of the first processing apparatus B and the high-frequency applying means 53 of the second processing apparatus C can be shared by either one of the applying means at the same time.

In this case, equipment costs are further reduced, but the conditions for corona discharge in each discharge electrode 31, 51 cannot be independently and freely set.

(6) The shape of the discharge part 55 of the discharge electrode 51 is hemispherical,
Any material having a spherical discharge tip, such as a spheroid, may be used. However, from the point of view of uniformity of corona discharge, a sphere is considered to be optimal.

(7) In addition to the instrument panel pad 1, the present invention applies corona discharge treatment to all three-dimensional resin molded products that have corner parts that require painting, adhesion, printing, etc. after molding, such as automobile bumpers and automobile moldings. It can be a thing.

Effects of the Invention As detailed above, the first invention can improve the adhesion of paints, adhesives, printing agents, etc. by corona discharge treatment on the surface of a three-dimensional resin molded product having corner parts. In addition, this treatment method can save the required equipment cost and equipment space, and shorten the treatment time. Furthermore, it is possible to reliably treat corner portions where corona discharge treatment is difficult.

In addition to the effects of the first invention, the second invention has the effect of further improving processing efficiency and shortening processing time.

The third invention not only can significantly save equipment and equipment space compared to conventional plasma processing equipment, but also can reliably perform corona discharge treatment on the entire surface of a three-dimensional resin molded product having corners. It has the effect of being able to.

In addition to the effects of the third invention, the fourth invention has the effect of contributing to improving the efficiency of corona discharge treatment.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment embodying the present invention;
Figure 2 is a cross-sectional view of the instrument panel pad cut in the longitudinal direction, Figure 3 is a cross-sectional view of the instrument panel pad along with a corona discharge treatment process using a rod-shaped discharge electrode, and Figure 4 is a corona discharge treatment process using a spherical discharge electrode. FIG. 5 is a schematic diagram showing the connection between the rod-shaped discharge electrode and the high-frequency applying means, and FIG. 6 is a schematic diagram showing the connection between the spherical discharge electrode and the high-frequency applying means. DESCRIPTION OF SYMBOLS 1... Instrument panel pad, 5, 8, 9, 13... Corner part, 23... Counter electrode, 26... Slide means, 2
7... Hydraulic cylinder, 31, 51... Discharge electrode, 3
2,52...Movement mechanism.

Claims (1)

[Claims] 1. A method for corona discharge treatment of a three-dimensional resin molded product 1 having corner portions 5, 8, 9, and 13, comprising:
The electrode for corona discharge is a discharge electrode 51 having a spherical discharge tip, and the discharge electrode 51 is connected to the molded product 1.
A corona discharge treatment method for a resin molded article, characterized in that the molded article 1 is relatively moved along the shape of the molded article 1 while causing a corona discharge in the vicinity of the molded article. 2. An apparatus for corona discharge treatment of a three-dimensional resin molded product 1 having corner portions 5, 8, 9, 13,
A jig 22 for fixing the molded product 1, a discharge electrode 51 having a spherical discharge tip, and moving mechanisms 26, 27 for three-dimensionally moving the discharge electrode 51 and/or the jig 22. 52. A corona discharge treatment apparatus for resin molded products. 3. The jig has a counter electrode 22, and a portion of the counter electrode 22 corresponding to the through hole of the molded product is covered with a buffer plate 25 made of a dielectric. Corona discharge treatment apparatus for resin molded products according to item 2. 4. Claim 3, wherein the moving mechanism 52 is a computer-controlled robot.
A corona discharge treatment apparatus for resin molded products as described in 2.