JP4555262B2 - Corona surface treatment equipment - Google Patents

Description

  The present invention relates to a corona surface treatment apparatus for modifying the surface of an object to be treated such as a plastic product by corona discharge.

  Conventionally, corona surface treatment of thick plastic products with a flat surface uses wire electrodes as discharge electrodes, and plastic products with uneven or curved surfaces have been treated by blowing air plasma. .

  However, although the wire electrode is effective for processing a flat surface, it is difficult to process an uneven surface or a curved surface. On the other hand, the air plasma treatment is effective to some extent for the treatment of the inside of the unevenness and the curved surface, but there are problems such as treatment unevenness, treatment scratches, and poor treatment efficiency.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 5-339398) discloses a corona discharge treatment apparatus that performs surface treatment by corona discharge while transferring a resin molded product by a conveyor. In this apparatus, a counter electrode (ground electrode) having a shape along the bottom surface of the resin molded product is installed below the transfer conveyor for transferring the resin molded product, and the surface thereof is covered with a dielectric, and above the transfer conveyor. By placing a large number of discharge electrodes with a shape along the top surface shape of the resin molded product at regular intervals in the direction of transfer of the resin molded product, and applying a high voltage pulse between the discharge electrode and the counter electrode The surface of the three-dimensional resin molded product is subjected to corona discharge treatment.

However, according to this, since the discharge electrode and the counter electrode have to be shaped along each of the upper surface shape and the lower surface shape of the three-dimensional resin molded product, it is used for a specific resin molded product and is not versatile. .
JP-A-5-339398

  An object of the present invention is to provide a corona surface that can be uniformly treated even on an object having an uneven surface or a curved surface, in which the discharge clearance between the discharge electrode and the object to be processed must be widened. The object is to provide a surface treatment apparatus.

In the corona surface treatment apparatus of the present invention, a plurality of discharge electrodes to which a high voltage is applied are suspended from a rotating electrode holder, and discharge is performed while rotating the plurality of discharge electrodes by rotating the electrode holder. A plurality of corona surface treatment units that corona-treat the surface of the object to be processed, and a rotation drive mechanism that simultaneously transmits the rotation of the motor to a metal rotation shaft fixed to the electrode holder of the plurality of corona surface treatment units; A high-voltage power supply member that is connected to a metal collar fitted to the rotation shafts of the electrode holders of a plurality of corona surface treatment units, and connects the rotation shafts, a plurality of corona surface treatment units, a rotation drive mechanism, and a high voltage The power supply member is installed at the bottom of the processing chamber so as to face the processing chamber in the chamber and all the discharge electrodes of the electrode holders of the plurality of corona surface processing units. And a corona discharge between the ground electrode plate and the discharge electrode in the processing chamber. The exhaust connection port for forcibly exhausting the ozone generated by the above to the outside is provided.

According to the present invention, in each of the plurality of corona surface treatment units, the electrode holder is rotated to discharge while rotating the plurality of discharge electrodes suspended from the electrode holder, so that a wide discharge area and directivity can be secured, Corona surface treatment can be performed without unevenness even on an object having an uneven surface or curved surface, in which the discharge clearance between the discharge electrode and the object to be processed must be widened.

In addition, each of the electrode holders of the plurality of corona surface treatment units is rotatable, and the metal rotation shafts of these electrode holders are connected with a high voltage power supply member with a metal collar interposed therebetween. and feeding the same time, in each of the plurality of electrode holder, since the discharge while turning a plurality of discharge electrodes by its rotation, it is possible to improve the processing and the processing accuracy repeat conveying products et an object to be processed . In addition, the high-voltage power supply member that supplies power to the plurality of electrode holders can easily supply power to the plurality of electrode holders because the rotation is not transmitted even when the rotation shaft of the electrode holder rotates .

Further, a plurality of electrode holders and a rotational drive mechanism for rotating them are installed in a processing chamber in which forced exhaust is performed to the outside, and the object to be processed passes through the processing chamber between the discharge electrode and the ground electrode plate. Thus, while being conveyed by the conveyor, it can be efficiently processed while conveying the object to be processed, and the adverse effect of ozone caused by discharge can be prevented.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
Since the corona surface treatment apparatus of the present invention is configured by using a plurality of corona surface treatment units having the same structure, first, an embodiment of the corona surface treatment unit as a single unit will be described.

FIG. 1 shows a first embodiment of a corona surface treatment unit. The corona surface treatment unit has a bearing 2 fixed to a support plate 1 having horizontal insulation, and a metal rotary shaft 3 that is vertically supported so as to penetrate the support plate 1 up and down. The electrode holder 4 which is a metal plate is fixed horizontally at the lower end, so that the electrode holder 4 is rotatably mounted on the support plate 1, and rotation from a motor (not shown) is rotated via an insulating belt. It is transmitted to the pulley 6 that is fixed to the third upper electrode holder 4 is rotated.

  A plurality of needle-like discharge electrodes 5 are vertically suspended from the electrode holder 4 at predetermined intervals by implanting the upper ends of the electrode holders 4 in the electrode holder 4. These discharge electrodes 5 are applied with a high voltage via the rotary shaft 3 and the electrode holder 4 when a high voltage from a high voltage power source (not shown) is supplied to the rotary shaft 3.

  Accordingly, the plurality of discharge electrodes 5 are discharged from the tip while turning as the electrode holder 4 rotates.

FIG. 2 shows a second embodiment of the corona surface treatment unit. In this corona surface treatment unit, the rotary shaft 3, the electrode holder 4 and the discharge electrode 5 are made hollow to communicate with each other, and gas is supplied from an L-shaped rotary joint 7 provided at the upper end of the rotary shaft 3 through a gas supply pipe (not shown). By injecting a gas such as air while discharging from the tip of the discharge electrode 5, ions are injected together with the gas.

FIG. 3 shows a third embodiment of the corona surface treatment unit. In this corona surface treatment unit, the discharge electrode 5 has a coil shape and has a spring property, and is swung by the rotation of the electrode holder 4 and further vibrates by applying an electric force due to a high frequency and a high voltage.

4 to 6 use two units of the corona surface treatment unit of the first embodiment shown in FIG. 1, and two electrode holders 4 are juxtaposed at a predetermined interval to rotate them. The shaft 3 is connected by a plate-shaped metal high-voltage power supply member 8, and a high voltage is supplied to the high-voltage power supply member 8 through the high-voltage cable 9 so that a high voltage is applied to the discharge electrodes 5 of the electrode holder 4 all at once. It is something that can be done. The high-voltage power supply member 8 is connected to a metal collar 10 fitted to the rotary shaft 3 so that the rotation is not transmitted to the high-voltage power supply member 8 even if the rotary shaft 3 rotates.

7 to 9 show a corona surface treatment apparatus according to an embodiment of the present invention, which is configured by using a plurality of corona surface treatment units as described above. In this corona surface treatment apparatus, the electrode holders 4 of the corona surface treatment unit of the first embodiment are arranged side by side as shown in FIGS. It is installed in the processing chamber 13 by the housing 12. In addition, a ground electrode plate 15 provided with a dielectric plate 14 made of resin on the upper surface is horizontally installed at the bottom of the processing chamber 13 so as to face all the discharge electrodes 5 of the plurality of electrode holders 4, and an object to be processed Is disposed horizontally so that an object to be processed passes through the processing chamber 13 between the ground electrode plate 15 and the discharge electrode 5, and the plurality of electrode holders 4 are arranged in the conveying direction of the conveyor 16. Are arranged in parallel at a predetermined interval.

The rotation drive mechanism 11 simultaneously transmits the rotation of one motor 17 installed in the processing chamber 13 to the rotation shafts 3 of the plurality of electrode holders 4 using, for example, an insulating belt and pulley. On the outer wall of the processing chamber 12, a power supply connector 18 for supplying high voltage from the outside and an exhaust connection port 19 for forcibly exhausting the inside of the processing chamber 12 to the outside are provided. By evacuating by connecting to the exhaust connection opening 19, for example air hose, an exhaust ozone generated by corona discharge between the discharge electrode 5 and the ground electrode plate 15 of a plurality of the electrode holder 4, the exhaust connection port 19 It can be done.

According to such a structure, since the plurality of electrode holders 4 are arranged in parallel in the transport direction of the conveyor 16 with a predetermined interval, the workpieces transported on the conveyor 16 are connected to the discharge electrode 5 rotating. Corona discharge with the ground electrode plate 15 is repeatedly received before passing through the processing chamber 13.

It is sectional drawing which shows 1st Embodiment of the corona surface treatment unit used in this invention. It is sectional drawing which shows 2nd Embodiment of a corona surface treatment unit . It is sectional drawing which shows 3rd Embodiment of a corona surface treatment unit . It is sectional drawing at the time of arranging two units of corona surface treatment units of 1st Embodiment side by side . It is a top view of the part. It is sectional drawing of the one part. It is a side view which shows the corona surface treatment apparatus of the Example of this invention comprised by arranging the corona surface treatment unit of 1st Embodiment in parallel as shown in FIGS. FIG. It is the front view.

1 Support plate 2 Bearing 3 Rotating shaft 4 Electrode holder 5 Discharge electrode 6 Pulley 7 Rotary joint 8 High-voltage power supply member 9 High-voltage cable 10 Collar 11 Rotation drive mechanism 12 Housing 13 Processing chamber 14 Dielectric plate 15 Ground electrode plate 16 Conveyor 17 Motor 18 Power supply connector 19 Exhaust connection port

Claims (1)

The electrode holder to rotate, and vertically a plurality of discharge electrodes applied with the high voltage through which the Rukoto discharged while swirling a plurality of discharge electrodes by the rotation of the electrode holder, the surface of the workpiece A plurality of corona surface treatment units for corona treatment;
A rotation drive mechanism for simultaneously transmitting the rotation of a motor to a metal rotation shaft fixed to an electrode holder of the plurality of corona surface treatment units;
A high-voltage power supply member that is connected to a metal collar fitted to a rotation shaft of an electrode holder of the plurality of corona surface treatment units and connects these rotation shafts;
A treatment chamber in which the plurality of corona surface treatment units, the rotation drive mechanism, and the high-voltage power supply member are installed;
An earth electrode plate installed at the bottom of the processing chamber so as to face all the discharge electrodes of the electrode holders of the plurality of corona surface treatment units;
A conveyor for conveying an object to be processed so as to pass through the treatment chamber between the ground electrode plate and the discharge electrode;
The corona surface treatment apparatus , wherein the treatment chamber is provided with an exhaust connection port for forcibly exhausting ozone generated by corona discharge between the earth electrode plate and the discharge electrode to the outside .

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