JPH08111278A - Corona discharge processing electrode - Google Patents

Abstract

PURPOSE: To provide a corona discharge processing electrode which can well work with different outside diameter of earth roll easily, can reduce the number of component parts and the costs, facilitates assembly and disassembly, and is free from necessity for separately making electric connections of knife type electrodes with each other. CONSTITUTION: A groove 8 is provided at one side face of each knife type electrode as stretching in the longitudinal direction while a projection 9 is furnished on the other side face as extending longitudinally. The groove and projection are given section shapes such that the electrodes can be fitted and separated to/from each other from the end faces about the longitudinal direction but the fitting is not set off in the direction across the thickness and that the required gap as to enable mutual angle adjustment of the electrodes is produced between the projection and groove which are fitted together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a corona discharge treatment electrode for irradiating a resin, paper, a metal plate, or the like with corona discharge to modify the surface, and in particular, a plurality of knife-type electrodes are arranged in parallel.
The present invention relates to a corona discharge treatment electrode for applying a high voltage to each of the knife-shaped electrodes to irradiate a corona discharge to a treatment object.

[0002]

2. Description of the Related Art Conventionally, as a corona discharge treatment electrode having a multi-electrode structure, for example, one disclosed in Japanese Patent Publication No. 64-11055 is known. In this conventional example, in addition to a plurality of knife-shaped electrodes in the form of a flat bar with only the upper and lower edges,
A large number of plastic electrode holding plates are used to hold this. Each electrode holding plate is provided with a plurality of slits having a shape similar to a cross section of substantially a half of the knife-shaped electrode at regular intervals. Then, a large number of electrode holding plates are arranged at regular intervals and held in a plastic housing, and each of the electrode holding plates is inserted through slits arranged so as to intersect with the electrode holding plates. The knife-type electrode is held in the housing at regular intervals via a number of electrode holding plates.

[0003]

However, according to this, the height of the edge of the discharge tip of each knife-type electrode and the distance between the knife-type electrodes are fixedly determined by the slits in the electrode holding plate. Can not. Therefore, for example, when a resin film is subjected to a surface treatment, a roll for guiding the resin film is used as a common ground electrode (ground roll), and the leading edges of a plurality of knife-shaped electrodes are arranged in parallel with the outer peripheral surface thereof at equal intervals. However, in order to cope with the difference in the outer diameter of the earth roll, a large number of electrode holding plates with slit lengths (and further intervals) changed according to the outer diameter are prepared. After replacing everything, the knife-shaped electrodes must be inserted one by one into the slit. This is not only a daunting task, but also requires a great deal of parts. Further, since the knife-type electrodes are held apart from each other by an electrode holding plate made of plastic, the knife-type electrodes must be separately electrically connected to each other by an electric connection means when a high voltage is applied.

Conventionally, as shown in FIG. 8, there has been an integrated multi-electrode 52 in which a plurality of knife-type discharge portions 50 are integrally and protruded in parallel with each other along the outer peripheral surface of an earth roll 51. According to this, it was necessary to manufacture the rolls corresponding to the outer diameter of the earth roll 51, and the number of the discharge portions 50 could not be arbitrarily changed.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention can easily cope with a difference in the outer diameter of the earth roll and adjust the corona treatment area by arbitrarily changing the number of discharge portions. It is an object of the present invention to provide a corona discharge treatment electrode which is not only capable of reducing the number of parts and reducing the cost, but also easy to assemble and disassemble, and which does not require separate electrical connection between knife-type electrodes.

[0006]

In the corona discharge treatment electrode according to the present invention, a concave groove extending in the length direction is provided on one side surface of each knife-type electrode, and a convex portion extending in the length direction is provided on the other side surface. The groove and the protrusion can be fitted and removed from the end faces in the lengthwise direction of the knife electrodes, but the cross-sectional shape is such that the fitting does not come off in the thickness direction. Between the groove and the groove, a size is formed so as to form a required gap that allows the angle adjustment of the knife electrodes.

The cross-sectional shape of the concave groove is, for example, C-shaped, and the cross-sectional shape of the convex portion is, for example, Ω-shaped. The knife electrodes are screwed into one of the knife electrodes, and their tips are pressed against the side surfaces of the other knife electrode to hold them at an arbitrary angle. In this case, it is advisable to provide an auxiliary groove on the side surface of each knife electrode in parallel with the concave groove for facilitating screwing of the screw.

At least one fixing knife-type electrode having the above-mentioned recessed grooves on both side surfaces thereof and a mounting portion for mounting to another member on the side opposite to the discharge side is prepared. If the knife-type electrodes having different structures are sequentially fitted and polymerized in parallel, the knife-type electrodes other than the fixing knife-type electrode need not be attached to other members. A plurality of discharge protrusions can be provided in parallel on the knife-type electrode for fixing. The knife-type electrode (including the fixing knife-type electrode) can be integrally formed by extrusion with aluminum, for example.

[0009]

In order to combine a plurality of knife-shaped electrodes, the grooves and the protrusions are fitted from one end in the longitudinal direction. The fitted knife-type electrodes do not come apart in the thickness direction, but the gap between the protrusion and the groove allows the angle to be adjusted within a predetermined angle range, so the discharge of multiple combined knife-type electrodes The tip edge can be easily adapted to the difference in the outer diameter of the earth roll. That is, even if the outer diameter of the earth roll is changed, it is possible to adjust the intervals of the discharge tip edges of the plurality of knife-type electrodes with respect to the outer peripheral surface thereof to be equal intervals. In addition, the number of knife-type electrodes used can be arbitrarily adjusted. The knife electrodes are directly electrically connected to each other by fitting the concave groove and the convex portion. Further, each knife-type electrode can be cut into an appropriate length before use.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. In this embodiment, two types of horizontally long knife-type electrodes that are integrally formed by extrusion of aluminum, that is, a fixing knife-type electrode 1 as shown in FIGS. 2 and 4.
And the attached knife electrode 2 as shown in FIGS. 3 and 5. Normally, the number of fixed knife electrodes 1 used is one, and the number of attached knife electrodes 2 is plural.

The fixing knife-type electrode 1 has cross sections C on both sides.
A concave groove 3 is provided symmetrically, three parallel discharge protrusions 4 are integrally projected on the lower surface, and a mounting portion 5 to another member is integrally projected on the upper surface. These recessed groove 3, discharge protrusion 4 and mounting portion 5
Are continuous from one end to the other end in the length direction. Upper and lower flange portions 3b, 3
c project inward from each other. Of the three inner surfaces of the groove 3, the upper surface 3d is a horizontal surface, the side surface 3e is a slightly inclined vertical surface, and the lower surface 3f is an inclined surface inclined downward toward the lower flange portion 3c. The cross section of the leading edge of each discharge projection 4 is arc-shaped. A cable connection groove 6 having a C-shaped section is provided on the upper surface of the mounting portion 5 for fitting and connecting a core wire (not shown) of the high-voltage cable from one end. A linear cut groove 7 is provided for indicating a position for drilling a screw hole when fixing to a member.

The knife electrode 2 for attachment is not only thinner as a whole than the knife-type electrode 1 for fixing, but is also lower in height due to the absence of the mounting portion 5, and has a different shape as follows. ing. That is, the attached knife electrode 2 has a groove 8 having a C-shaped cross section in the middle of one side surface and a cross section Ω in the middle of the other side surface.
Convex part 9, auxiliary grooves 10 and 11 having a C-shaped cross section above and below it,
One discharge projection 12 is provided on the lower surface. The concave groove 8, the protrusion 9, the auxiliary grooves 10 and 11, and the discharge protrusion 12 are respectively continuous from one end to the other end in the length direction. On the opposite side of the upper and lower auxiliary grooves 10 and 11, upper and lower linear cut grooves 13 and 14 are provided for indicating a position for drilling a screw hole.

Upper and lower flange portions 8b and 8c protrude inward from a horizontally long opening surface 8a of the groove 8. Of the three inner surfaces of the groove 8, the upper surface 8d is a horizontal surface, the side surface 8e is a vertical surface,
The lower surface 3f is a horizontal plane. Since the convex portion 9 has an Ω-shaped cross section, its tip portion is an enlarged portion 9a that bulges vertically. The discharge protruding portion 12 protrudes obliquely to one side in the thickness direction, and a cross section of a tip edge thereof has an arc shape.

The groove 3 of the knife electrode 1 for fixing and the projection 9 of the knife electrode 2 for attachment have the following relationship.
As shown in FIG. 6, since the enlarged portion 9 a of the convex portion 9 is larger than the horizontally long opening 3 a of the concave groove 3, the convex portion 9 can be fitted into the concave groove 3 unless it is from the longitudinal end face. In addition, the concave groove 3 and the convex portion 9 fitted in this way, the convex portion 9 engages with the upper and lower flange portions 3b and 3c of the concave groove 3, so that the convex portion 9 is 3 cannot be removed in the thickness direction. However, the cross-sectional size of the concave groove 3 is larger than that of the convex portion 9, and a gap having a sufficient width is formed between them. Even when the knife electrode 2 is attached to the upper and lower flanges 3b and 3c,
Can adjust the overlapping angle with respect to the fixing knife type electrode 1.

The concave groove 8 and the convex portion 9 of the auxiliary knife electrode 2 are mutually formed.
Also has the same relationship as above. That is, as shown in FIG.
a, the convex portion 9 cannot be fitted into the concave groove 8 only from the end face in the longitudinal direction, and the concave groove 8 and the convex portion 9 thus fitted are A huge part 9 of 9
Are engaged with the upper and lower flanges 8b and 8c of the concave groove 8 so that the projection 9
Cannot be removed from the groove 8 in the thickness direction. But,
The size of the cross section of the concave groove 8 is larger than that of the convex portion 9 and a gap is formed between them, so that the enlarged portion 9 of the convex portion 9 is formed.
Even when a is engaged with the upper and lower flanges 8b and 8c of the concave groove 8, the angle at which the auxiliary knife electrodes 2 overlap can be adjusted.

As shown in FIG. 6, a knife-type electrode 1 for fixing is used.
When the convex portion 9 of the attachment knife electrode 2 is fitted in the concave groove 3 of and the attachment knife electrode 2 is fixed at a certain angle to the fixing knife electrode 1, the attachment knife electrode 2 A screw hole 15 is drilled in 2, and a screw 16 is screwed into the screw hole 15 so that the tip of the screw is pressed against the side surface of the fixing knife-type electrode 1. In this case, the screw holes 15 may be formed on both the upper and lower linear cut grooves 13 and 14 of the attached knife electrode 2, and the upper and lower sides may be fixed with the screws 15, or only the upper and lower sides may be fixed. Good.

As shown in FIG. 7, the same applies to the case where the additional knife electrodes 2 are combined and fixed at a certain angle. It should be noted that the screw hole 15 is appropriately opened according to the situation at the installation site when the knife electrodes 1 and 2 are used, but may be opened during manufacture.

FIG. 1 shows an example of use in which a resin film 17 is guided by an earth roll (grounded roll) 18 for corona treatment. The fixing knife electrode 1 is fixed to a support member (not shown), A plurality of attachment knife electrodes 2 (3 in the figure) are attached in parallel on both sides of the fixing knife electrode 1 as a center. In this case, the distance from the outer peripheral surface of the earth roll 18 to the distal end edge of each knife electrode 2 for attachment is equal to the distance from the outer peripheral surface of the earth roll 18 to the distal end edge of the discharge projection 4 of the knife electrode 1 for fixing. The angle of each additional knife electrode 2 is adjusted by the screw 16 so as to be equal. The fixing knife-type electrode 1 and the supplementary knife electrode 2 are electrically connected directly by contact between the inner surface of the former concave groove 3 and the outer surface of the latter convex portion 9. Since the inner surface of the concave groove 8 and the outer surface of the convex portion 9 are in direct contact and electrically connected to each other, the high-voltage cable is fitted and connected to the cable connection groove 6 of the mounting portion 5 of the knife-type electrode 1 for fixing. When a high voltage is applied to the knife electrode 1 for use, a high voltage is also applied to the knife electrode 2 for all attachments. Then, a corona discharge is applied to the resin film 17 from the discharge protrusions 4 of the fixing knife-type electrode 1 and the discharge protrusions 12 of all the knife electrodes 2 attached together.

In the illustrated embodiment, three discharge projections 4 are provided on the fixed knife electrode 1 and one discharge projection 12 is provided on each of the auxiliary knife electrodes 2. However, the number is not limited. Absent.

[0020]

According to the electrode for corona discharge treatment according to the present invention, the following effects can be obtained. When fitting the concave groove and the convex portion of the plurality of knife-type electrodes from one end in the length direction, the knife-type electrodes mutually,
Although it does not come off in the thickness direction, the angle between the protrusions and the grooves can be adjusted within a predetermined angle range by the gap between the protrusions and the grooves. It can be easily handled. That is, even if the outer diameter of the earth roll changes, it is possible to easily adjust the distance between the discharge leading edges of the plurality of knife-shaped electrodes to the outer peripheral surface so as to be equal. Since the number of knife electrodes used can be easily increased or decreased,
Adjustment of the corona discharge treatment area is also easy. Since the knife-type electrodes are directly electrically connected to each other by the engagement between the concave groove and the convex portion, a separate electric connection means is not required. Each knife-type electrode can be cut into an appropriate length before use.

The knife-type electrodes can be held at an arbitrary angle by simply screwing a screw into one knife-type electrode and pressing the tip of the knife-type electrode against the side surface of the other knife-type electrode. In this case, if an auxiliary groove is provided on the side surface of each knife-type electrode in parallel with the concave groove, the screw can be easily screwed. At least one knife-type electrode for fixing having a concave groove on both sides and a mounting portion to another member on the side opposite to the discharge side is prepared, and an additional having a convex portion and a concave groove is provided. If the knife-type electrodes for fitting are successively fitted and superposed in parallel, the knife-type electrode for attachment does not need a mounting portion to other members,
The size can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic view showing a usage example of a corona discharge treatment electrode according to the present invention.

FIG. 2 is a perspective view of a knife-type electrode for fixing in a corona discharge treatment electrode according to the present invention.

FIG. 3 is a perspective view of a knife electrode for attachment.

FIG. 4 is an end view of a knife-type electrode for fixing.

FIG. 5 is an end view of an additional knife-type electrode.

FIG. 6 is a cross-sectional view showing a combined state of one fixing knife type electrode and one additional knife type electrode.

FIG. 7 is a cross-sectional view showing a combined state of one fixing knife-type electrode and two additional knife-type electrodes.

FIG. 8 is a schematic sectional view of a conventional example.

[Explanation of symbols]

 1 Knife-type electrode for fixing 2 Knife-type electrode for attachment 3 Recessed groove 4 Discharge protrusion 5 Mounting part 8 Recessed groove 9 Convex part 10 Auxiliary groove

Claims (7)

[Claims] 1. A corona discharge treatment electrode in which a plurality of knife-type electrodes are arranged in parallel, and a high voltage is applied to the knife-type electrodes to irradiate a treatment object with corona discharge from one side surface of each of the knife-type electrodes. A concave groove extending in the length direction and a convex portion extending in the length direction on the other side surface are provided.The concave groove and the convex portion can be fitted / disengaged from the end face in the longitudinal direction between the knife electrodes, but The cross-sectional shape is such that the fitting does not come off in the depth direction, and the required gap is formed between the fitted convex part and concave groove so that the angle between the knife electrodes can be adjusted. A corona discharge treated electrode characterized in that 2. The corona discharge treatment electrode according to claim 1, wherein the cross-sectional shape of the concave groove is C-shaped, and the cross-sectional shape of the convex portion is Ω-shaped. 3. A knife-type electrode is characterized in that a screw is screwed into one knife-type electrode and its tip is pressed against the side surface of the other knife-type electrode to hold the knife-type electrodes at an arbitrary angle. The corona discharge treatment electrode according to claim 1 or 2, wherein 4. The corona discharge treatment electrode according to claim 3, wherein an auxiliary groove is provided on a side surface of each knife type electrode in parallel with the concave groove. 5. The corona discharge treatment electrode according to claim 1, comprising at least one knife-type electrode for fixing having a concave groove on both side surfaces and a mounting portion to another member on a side opposite to the discharge side. 6. The corona discharge treatment electrode according to claim 1, wherein a plurality of discharge projections are provided in parallel on the knife-type electrode for fixing. 7. The corona discharge treated electrode according to claim 1, wherein the knife-shaped electrode is an extruded and integrally molded product of aluminum.