JPH03188136A - Method and apparatus for corona discharge treatment of molded resin article - Google Patents

Abstract

PURPOSE:To reduce the cost and space of equipment, decrease the time needed, and improve the efficiency in the corona discharge treatment of a three- dimensional molded resin article having corners by using two specific discharge electrodes. CONSTITUTION:A three-dimensional molded resin article 1 having corners 5, 8, 9, and 13, e.g. an automotive instrument panel pad made of a polypropylene resin, is fixed to a jig member A with a jig 22; the second discharge electrode 31 having a rod- or plane-shaped discharge part is moved by a mechanism 26, 27, and 32 which three-dimensionally moves the jig 22 and/or the electrode 31, and is then caused to conduct corona discharge near the article 1 to treat the article 1; and the first discharge electrode 51 having a spherical discharge tip is moved by a mechanism 26, 27, and 52, which three-dimensionally moves the electrode 51 and/or the jig 22, in accordance with the shape of the article 1 to treat the article 1.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method of modifying the surface of a resin molded article by corona discharge treatment, and a corona discharge treatment apparatus used in the method. The present invention relates to a method and apparatus for corona discharge treatment of three-dimensional resin molded products.

(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 chromic 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. It became so.

Since this 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 bumper moldings, etc.

(Problems to be Solved by the Invention) However, since the plasma processing requires a plasma gas atmosphere under reduced pressure, it requires large-scale and expensive equipment such as a vacuum chamber, a vacuum pump, a valve mechanism, and a carrier gas. There was a problem in that it took time to reduce the pressure inside the tank. Furthermore, since the process must be carried out in batches, 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, A step of using the electrode as a first discharge electrode with a spherical discharge tip and moving the first discharge electrode relatively along the shape of the molded product, Alternatively, a method is employed in which a planar second discharge electrode is used, and the second discharge electrode is subjected to corona discharge in the vicinity of the molded article.

A second invention is an apparatus for corona discharge treatment of a three-dimensional resin molded product having a corner portion, which includes a jig for fixing the molded product, a counter electrode provided on the jig, and a discharge tip having a spherical shape. and a first movement mechanism for three-dimensionally moving the first discharge electrode and/or the jig, and the discharge part is rod-shaped or planar. Second
The gist of the device is a device including a discharge electrode and a second moving mechanism for three-dimensionally moving the second discharge electrode and/or the jig.

(Function) In the first aspect of the present invention, corona discharge is generated in the atmosphere from the first 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,
Improves adhesion of paints, adhesives, printing agents, etc.

In addition, since the tip of the discharge is spherical, the corona discharge is not affected by changes in the potential distribution at the corner, the angle of the surface to be treated with respect to the discharge aroma, etc., and is effective even at the corner. do. Therefore, not only the flat part of the molded product, but also
Corners are also reliably treated with corona discharge.

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

Furthermore, in the vicinity of the three-dimensional resin molded product having a corner part, corona discharge is generated over a wide range from the second discharge electrode whose discharge part is rod-shaped or planar. It is processed. Therefore, by combining the treatment using the discharge electrode, the treatment efficiency is further increased.

In the second invention, the jig fixes the three-dimensional resin molded product, and the moving mechanism moves one or both of (1) the first discharge electrode whose discharge tip is spherical and (2) the jig three-dimensionally. move it to Therefore, the discharge electrode can be moved to any surface of the molded article and performs corona discharge treatment on the surface.

The moving mechanism moves either or both of (1) a discharge electrode whose discharge portion is rod-shaped or planar, and (2) a jig to bring the discharge electrode and the jig closer together. Therefore, the discharge electrode is brought close to the surface of the molded article to perform corona discharge treatment.

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

The three-dimensional resin molded product as used in the present invention refers to a resin molded product excluding planar planar bodies such as resin sheets and flat resin plates, and has three-dimensional irregularities.

The three-dimensional resin molded product subjected to corona discharge treatment in this example is an automobile instrument panel pad (hereinafter abbreviated as instrument panel pad) made of PP resin, as shown in FIGS. 1 to 4. An instrument panel is constructed by adhering a skin sheet made of polyvinyl chloride resin (PVC) to the surface of the instrument panel.

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.

Further, two shallow dish portions 6 and 7 are provided on both left and right sides of the upper surface 2 of the instrument panel pad. Therefore, as shown in FIG. 2, convex corner portions are present at the upper edges of the dish portions 6 and 7, and the radius of each corner portion 8 and 9 is approximately 6 mm. Also,
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. Each outlet 10, 11.12 has a substantially square shape, and has corner portions 13 with radiuses of 6 to 15 mm at the edges and four corners.

As described above, the instrument panel pad 1 is a three-dimensional molded product and is characterized by having multiple corner portions 5, 8, 9, and 13.

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

This corona discharge treatment apparatus uses a jig member A (including a moving mechanism and a counter electrode for the jig member A) for fixing the instrument panel pad L, and a discharge electrode having a rod-shaped discharge part to corona the instrument panel pad L. The first processing device B (
(disposed on the left side in FIG. 1), and a second processing device C (disposed on the right side in FIG. 1) that performs corona discharge treatment on the instrument panel pad 1 using a discharge electrode having a spherical discharge tip. Its main parts are composed of:

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

[Jig member A] The shaft member A has a base 21, and the base 21 can be moved forward, backward, left and right on the floor by a sliding means provided on the floor (normal means such as rails and rollers can be adopted). It can be moved arbitrarily and can also be moved up and down arbitrarily by a hydraulic cylinder 27 provided below the base 21.

As shown in FIGS. 2 and 3, a jig main body 22 formed from epoxy resin into the internal shape of the instrument panel pad 1 is attached to the upper part of the base 21, and is designed to support the instrument panel pad l from the inside. It has become. The jig main body 22 can be easily formed into a shell-like shape by pouring an epoxy resin into the inside of the instrument panel pad l and curing it by reaction.

A counter electrode 23 for corona discharge treatment is provided on the surface between the jigs 22.
A counter electrode (counter electrode) is coated by metal plating, vacuum deposition, sputtering, conductive paint application, aluminum foil pasting, etc., and the surface of the counter electrode 23 is almost in contact with the inner surface of the instrument panel pad (■). ing.

In addition, in the jig main body 22, there are holes at a depth of approximately 6 mm at the locations corresponding to the air conditioner outlets 10, 11, and 12 of the instrument panel pad 1.
A recess 24 with a thickness of 6 mm is formed, the counter electrode 23 is formed on the surface of the recess 24, and a buffer plate 25 with a thickness of about 6 mm is formed in the recess 24 with a dielectric material such as Hypalon rubber or epoxy resin. is fitted to ensure uniform corona discharge. That is,
Since the air outlet 10, 11.12 is a through hole, the jig body 22
This is because if the counter electrode 23 is directly formed at the corresponding location, the counter electrode 23 will be exposed to the discharge electrode described later, and the corona will become like a discharge spark and become disordered.

[First Processing Apparatus B] The first processing apparatus B includes a discharge electrode 31 whose discharge part is rod-shaped, moves the discharge electrode 31 close to the instrument panel pad 1, and further moves the discharge electrode 31 along each surface of the instrument panel pad 1. It is comprised of a moving mechanism 32 for moving, and a high frequency applying 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 is formed by bending a stainless steel rod with a diameter of 14 mm into a U-shape.
Grasped portion 34 gripped by moving mechanism 32 in order from the base end
, a rod-shaped discharge portion 35 corresponding approximately parallel to the instrument panel pad l, and an end portion 36 for preventing corona discharge from concentrating on the tip of the discharge portion 35 and causing uniform corona discharge throughout the discharge portion 35. The two parts are arranged to be orthogonal to each other.

Note that the radius of the discharge electrode 31 is 7 mm, which is larger than the radius of the main corner portions 5, 8°9 of the instrument panel pad 1 (6 mm).

Further, a computer-controlled robot 1 is used for the moving mechanism 32, and various commercially available industrial robots can be operated (for example, ■Hitachi's multi-purpose work robot, model PW-lo, etc.).

The moving mechanism 32 of this embodiment is multi-jointed, and is configured 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 40 are pivotally attached to the upper part of the support base 38 so that they can rotate independently. ing.

A third arm 41 is pivotally attached at its base end to the upper part of each of the two arms 39 and 40, and the third arm 41
A cylindrical acting portion 42 is rotatably attached to the tip of the actuator 42 . The operating portion 42 is formed to be rotatable around itself, and a gripping member 43 for gripping the gripped portion 34 of the discharge electrode 31 is attached to the tip thereof.

Note that the rotation of the support base 38, the movement of each arm 39 to 41, the rotation of the action part 42, etc. are all controlled by a computer (not shown), and when these are operated according to the computer program, the discharge electrode 31 approaches the top surface 2, front surface 3, and side surface 4 of the instrument panel pad 1 at intervals of about 10 mm, and moves along each of these surfaces.

A high frequency applying means 33 consisting of a high frequency oscillator 45 and a high voltage transformer 46 is connected to the opposing electrode 23 and the rod-shaped discharge electrode 31 of the jig member A, and the opposing 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 a frequency of 20 to 30kHz, maximum output of 35
Tantic's product (product HV) that generates 0W high frequency
O5-2) 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, 31, and is also a product of Tantic Co. (trade name: Super C).

Note that the high frequency application means 33 and the computer control mechanism of the moving mechanism 32 are installed at a considerable distance apart, and are 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. Furthermore, for the same reason, the cord connecting the high frequency oscillator 45, high voltage transformer 46, and discharge electrode 31 must be reliably shielded.

The second processing device C moves 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 for causing corona discharge, 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 is made of stainless steel, and the moving mechanism 5
A rod-shaped gripped part 54 with a diameter of 2 mm is gripped by the gripped part 2, and a spherical discharge part is made of stainless steel and is attached to the tip of the gripped part 54 and corresponds almost perpendicularly to the instrument panel pad 1. 55 and is placed in the atmosphere.

The radius of the sphere of the discharge section 55 is 2.5+nm, which is characterized in that it is smaller than the radius (6 to 15 mm) of each corner section 5.8 and 9.13 of the instrument panel pad I.

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

Further, the moving mechanism 52 is the moving mechanism 3 of the first processing device B.
The same one as 2 is used.

Therefore, the rotation of the support base 38, the movement of each arm 39 to 41, the rotation of the action part 42, etc. are operated according to a computer program (not shown), so that the discharge electrode 5
The discharge portion 55 of No. 1 is connected to the corner portions 58, 5 of the instrument panel pad 1.
, 9.13 and the outlet to, approaching the cut surface of 11.12 approximately perpendicularly to a distance of about 10 mm, and
It is designed to move three-dimensionally along each of these shapes.

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. These high frequency oscillators 56 and high voltage transformers 57 include the first
The same one as that of processing device B is 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 l has stains caused by a mold release agent or manual work attached to it, it is desirable to perform a pretreatment to clean these 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 front 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 if the distance is about 2 to 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 portion of the instrument panel pad 1 is subjected to corona discharge treatment by the first treatment device B. That is, when the moving mechanism 32 is operated, the discharge portion 35 of the rod-shaped discharge electrode 31 is arranged to extend in the front-rear direction with respect to the upper surface 32 of the instrument panel pad 1, as shown in FIG. As shown, it is located above the left end of the upper surface 2 at an interval of about 10 mm.

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, the upper surface 2 of the discharge section 35
A corona discharge is generated in the atmosphere between the portion facing the upper surface 2 and the upper surface 2, and corona discharge treatment of the upper surface 2 is started to improve the adhesion of the adhesive or the like. The improvement in wettability due to the corona discharge treatment of this example is comparable to that of conventional flame treatment.

The reduction in corona discharge treatment is due to the large amount of electron flow generated by the discharge colliding with the synthetic resin (P in this example).
This is thought to be because the collision 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 generates the corona discharge while
It is gradually moved to the right side of the upper surface 2 by the moving mechanism 32. This moving speed is 1 to 250 mm/under the above discharge conditions.
It can be set arbitrarily within the range of see, but
In this embodiment, the speed was set at 150 mm/sec in consideration of sufficient processing results and shortening of processing time.

Most of the upper surface 2 is subjected to corona discharge treatment by the movement of the discharge electrode 31, but the corner portion 5 of the upper surface 2, the cut surface and corner portion 13 of the air outlet IO, and the corner portions 8, 9 of the dish portions 6, 7 The potential distribution changes in these areas, and the surface to be treated is not perpendicular to the discharge direction.
This is considered to be because the corona discharge is pulled to the surface other than these parts for reasons such as this, and the corona discharge does not work effectively.

By the way, if the discharge electrode 31 were to directly face the discharge electrode 23 when passing above the air outlet 10, intense discharge would occur, resulting in product defects. However, in this embodiment, as described above, since the buffer plate 25 made of dielectric material is interposed, the discharge is relaxed and made uniform. Note that in other parts of the upper surface 2, the instrument panel pad l itself is a dielectric material and acts as a buffer member, so that uniform discharge occurs.

Now, if a buffer member made of a dielectric material is provided all over the inside of the instrument panel pad l, the corona discharge will be uniform, but it will be weaker over the entire surface of the instrument panel pad l.
Processing efficiency decreases. In this embodiment, in order to prevent this decrease in efficiency, the buffer plates 25 are provided only inside the air outlets 10 to 12, which are through holes.

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 and extends in the vertical direction with respect to the front surface 3 of the instrument panel pad 1, as shown in FIG. It is arranged like this. 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 right end front while continuing the corona discharge, thereby causing the corona discharge of the front surface 3. Processing takes place.

Note that the cut surface and corner portion 13 of the outlet 11.12 are difficult to treat, and when the discharge electrode 31 passes in front of the outlet 11.12, the corona discharge is maintained uniformly by the action of the buffer plate 25. This is the same as in the case 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 l, as shown in FIG. . Subsequently, the discharge electrode 31 is filled with water from the side of the rear end of the side surface 4 to the front and side of the end, and the side surface 4 is subjected to corona discharge treatment.

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 apparatus B described above is approximately 25 seconds.

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

As described above, the first processing apparatus B eliminates the need for costly equipment such as a vacuum chamber, vacuum pump, valve mechanism, and carrier gas in conventional plasma processing, as well as the preparation time required to depressurize the vacuum chamber. The surface of the PP resin instrument panel pad 1 can be modified simply by generating corona discharge in the atmosphere using the 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 (2), the surface to be treated can be treated at once, resulting in extremely high treatment efficiency.

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 hinge spring pad 1
is moved forward of the second processing device C by the slide means 26.

Subsequently, the corner portions 4, 8, 9° 13, etc., which were not sufficiently subjected to the corona discharge treatment by the first treatment device B, are treated by the second treatment device C. That is, the moving mechanism 5
2 is activated, and as shown in FIG. 4, 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.

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 electrodes 51 to generate corona discharge between the discharge section 55 and the corner section 5.

As shown in FIG. 4, the corona discharge spreads from the discharge portion 55 in an extremely uniform discharge pattern, so the treatment area on the surface of the instrument panel pad 1 at each time is quite wide, with a diameter of 1.
The area within the circle of 0 to 15 mm is sufficiently processed. 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 discharging tip has a curved shape, the corner portion 5
The corona discharge also effectively acts on the corner portion 5 due to the influence of changes in the potential distribution in the area and the angle of the surface to be treated with respect to the discharge direction. In particular, the discharge electrode 51 of this embodiment
Since the radius of the discharge portion 55 is smaller than the radius of the corner portions 5, 8, 9, and 13, it is hardly affected by the above-mentioned influence. 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.

Since the discharge electrode 51 is three-dimensionally moved over all the corner portions 5 by the moving mechanism 52 while generating corona discharge, the corner portions 5 around the entire circumference are completely treated. This moving speed is 1 to 250 mm/sec under the above discharge conditions.
Although it can be set arbitrarily within the range of e, in this example, it was set to 150 mm/see 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 onto the corner portions 8 and 9 of the dish portions 6 and 7 by the moving mechanism 52 as shown in FIG. ，
9 is moved three-dimensionally. In particular, the concave corner portion 9
is hardly treated by the rod-shaped discharge electrode 31 due to the distance from the counter electrode 23, so the treatment by the spherical discharge electrode 51 is effective. The corner portions 8 and 9
After the treatment, the discharge electrode 51 is similarly connected to the corner outlet 10°, 11.
12 in turn, and their cut surfaces and corners 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 11 may be moved by the sliding means 26 and the hydraulic cylinder 27, or the discharge electrode 51
and the instrument panel pad l 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 processed to be adjusted.

In this way, according to the second processing device C, similarly to the first processing device B, the surface of the instrument panel pad L is modified by simply generating a corona discharge in the atmosphere using the discharge electrode 51 and moving the corona discharge. be able to.

Therefore, it is possible to save and shorten equipment costs, equipment space, and processing time.

Furthermore, since the discharge electrode 51 whose discharge tip has a curved shape at least is moved along the surface of the instrument panel pad l, the corner portion 5 which is difficult to handle with the rod-shaped discharge electrode 31
, 8, 9.13 can also be reliably processed.

As described above, in this embodiment, the first processing device B processes the main part of the instrument panel pad 1 in a short time, and the second processing device C
Since the processing of the corner portions 5.8 and 9.13 of the instrument panel pad l is combined with the processing of the corner portions 5.8 and 9.13 of the instrument panel pad l, the overall processing efficiency is extremely high, and the processing time can be significantly shortened.

It should be noted that the present invention is not limited to the configurations of the embodiments described above, and can be implemented with arbitrary changes without departing from the spirit of the invention, for example, as described below.

(1) Generally, in order to generate corona discharge, two adjacent electrodes (counter electrode 2
Usually, a high frequency voltage or a high voltage is applied between the discharge electrode 31 and the discharge electrode 31,51).

However, by utilizing atmospheric discharge, it is possible to generate corona discharge only with 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. I can do it.

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) Processing method by first processing device B and second processing device C
The processing method may be performed in the reverse order of the above embodiments, or
Either or both of the treatment methods can be repeated two or more times, or in any combination.

(3) 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 constant temperature and humidity room.

(4) 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 used simultaneously by one of the applying means.

In this case, equipment costs are further reduced, but each discharge electrode 3
It is no longer possible to independently and freely set the conditions for corona discharge in 1.51.

(5) A planar discharge electrode may be used instead of the rod-shaped discharge electrode 31, and the planar discharge electrode may be moved closer to the instrument panel pad l by the moving mechanism 32.

(6) In addition to the above-mentioned instrument panel pad 1, the present invention can also be applied to automobile bumpers, automobile moldings, etc., such as painting, adhesion, etc. after molding.
All three-dimensional resin molded products having corner parts that require printing or the like can be subjected to corona discharge treatment.

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, the equipment cost and equipment space required for the treatment method can be reduced, and the treatment time can be shortened. Furthermore, corner portions where corona discharge treatment is difficult can be reliably treated, resulting in the effect of improving treatment efficiency.

Furthermore, the second invention not only can significantly save equipment and equipment space compared to conventional plasma processing equipment, but also can reliably process corona discharge treatment on the entire surface of a three-dimensional resin molded product having corners. This 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, FIG. 2 is a cross-sectional view of an instrument panel pad cut in the longitudinal direction, and FIG.
The figure is a cross-sectional view of an instrument panel pad shown along with a corona discharge treatment process using a rod-shaped discharge electrode, FIG. 4 is a cross-sectional view of an instrument panel pad shown together with a corona discharge treatment process using a spherical discharge electrode, and FIG. FIG. 6 is a schematic diagram showing the connection between the spherical discharge electrode and the high frequency applying means. Instrument panel pad...1, corner section...5.8,9°13, counter electrode...23, sliding means...26,
Hydraulic cylinder...27, discharge electrode...31,5I,
Moving mechanism...32,52°

Claims (1)

[Claims] 1. A method for corona discharge treatment of a three-dimensional resin molded product (1) having corner portions (5, 8, 9, 13), the method comprising: using an electrode for corona discharge with a spherical discharge tip; A step of relatively moving the first discharge electrode (51) along the shape of the molded product (1), and a step of moving the electrode for corona discharge so that the discharge part is A resin characterized in that it consists of a combination of a step of forming a rod-shaped or planar second discharge electrode (31) and causing the second discharge electrode (31) to perform a corona discharge in the vicinity of the molded article (1). Corona discharge treatment method for molded products. 2. An apparatus for corona discharge treatment of a three-dimensional resin molded product (1) having corner portions (5, 8, 9, 13), comprising a jig (22) for fixing the molded product (1), and a jig (22) for fixing the molded product (1); Jig (22)
a first discharge electrode (51) having a spherical discharge tip;
1) and/or a first moving mechanism (26, 27, 52) for three-dimensionally moving the jig (22), and a second moving mechanism in which the discharge part is rod-shaped or planar. It includes a discharge electrode (31) and a second movement mechanism (26, 27, 32) for three-dimensionally moving the second discharge electrode (31) and/or the jig (22). A corona discharge treatment device for resin molded products characterized by the following. 3. The corona discharge treatment apparatus for resin molded products according to claim 1, wherein the first moving mechanism and the second moving mechanism include a common moving mechanism.