JP2001131313A - Electric discharge treatment device for plastic film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric discharge treatment device for plastic films, enabling an efficient electric discharge treatment in a gaseous atmosphere by directly introducing a gas into an electric discharge section to effect reducing the quantity of the gas to be introduced into a hood compared to the conventional cases, and also enabling an efficient corona treatment in a gas-substituted state through preventing air from intrusion into the electric discharge section between electrode and counterelectrode. SOLUTION: This electric discharge treatment device has such a scheme that a discharge electrode 1 enclosed with a hood 3 is disposed against a counterelectrode 2, and a voltage is applied to the space between the electrodes 1 and 2 to accomplish modification of the surface of a plastic film 5 put between these electrodes 1 and 2; wherein the discharge electrode 1 is mounted with a means 4 for feeding a gas toward the plastic film 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic film discharge treatment apparatus for modifying the surface of a plastic film by corona discharge.

[0002]

2. Description of the Related Art In order to modify the surface of a plastic film, the plastic film is sandwiched between rolls and electrodes.
A discharge treatment method in which a high voltage is applied during this period to generate corona discharge is known, for example, from Japanese Patent Publication No. 62-4058. In the case of performing a discharge treatment for modifying the surface of a plastic film in an atmosphere of nitrogen gas, helium gas, carbon dioxide gas, etc., for example, Japanese Patent Publication No. 61-00
8847. Further, those in which a discharge treatment for modifying the surface of a plastic film is performed in an oxygen gas atmosphere are disclosed in, for example, Japanese Patent Publication No. Sho 60-3497.
Japanese Unexamined Patent Publication No. 60-17342 discloses an apparatus disclosed in Japanese Patent Publication No. 60-17342, which is performed in a nitrogen gas atmosphere.

FIG. 2 shows an example of a conventional plastic film discharge treatment apparatus. In FIG. 2, the corona discharge electrode 101 is arranged to face the counter electrode roll 102. The corona discharge electrode 101 is contained in a hood 103, and a supply port 104 for supplying a gas other than air is provided in the hood 103. A high voltage is applied between the corona discharge electrode 101 and the counter electrode roll 102 to perform a surface treatment on the plastic film 105 disposed between the corona discharge electrode 101 and the counter electrode roll 102 by corona discharge. Generally, the plastic film 105 is subjected to a surface treatment represented by corona discharge for the purpose of improving the surface characteristics. The corona discharge treatment is usually performed in the air, but effective treatment can be performed by performing the treatment in a gas atmosphere of oxygen, nitrogen, carbon dioxide, or the like. As an example of such an apparatus, there is an apparatus that supplies gas by surrounding it with a hood 103 as shown in FIG.

[0004]

However, the supply port 104
In the apparatus for supplying gas from the upper portion of the hood 103 as described above, a large amount of gas flow is necessary to replace the gas in the hood, and high-speed processing in which the traveling speed of the plastic film exceeds 200 m / min. Sometimes,
There is a problem that the atmosphere of the discharge part is not adjusted by the air accompanying the plastic film.

[0005] The present invention solves the above-mentioned problems, and enables a discharge treatment in a gas atmosphere at a high rate by introducing a gas directly into a discharge portion, thereby reducing the amount of gas introduced into a hood as compared with the conventional case. And a plastic film discharge treatment device that can prevent air from entering the discharge portion between the discharge electrode and the counter electrode roll and enable efficient corona treatment in a gas replacement state. The purpose is to provide.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a discharge electrode surrounded by a hood is arranged opposite to a counter electrode roll, and a voltage is applied between the discharge electrode and the counter electrode roll. In a plastic film discharge treatment apparatus for modifying the surface of a plastic film disposed between the discharge electrode and the counter electrode roll, gas discharge means for supplying a gas toward the plastic film to the discharge electrode. It has been provided. Further, the present invention arranges a discharge electrode surrounded by a hood facing the counter electrode roll, and applies a voltage between the discharge electrode and the counter electrode roll,
In a plastic film discharge treatment apparatus for modifying the surface of a plastic film disposed between the discharge electrode and the counter electrode roll, gas supply means for the plastic film is provided on the upstream side of the electrode in the running direction of the plastic film. It is in. Furthermore, in the present invention, a discharge electrode surrounded by a hood is disposed opposite to the counter electrode roll, and a voltage is applied between the discharge electrode and the counter electrode roll, and the discharge electrode is disposed between the discharge electrode and the counter electrode roll. In the plastic film discharge treatment apparatus for modifying the surface of the plastic film, the discharge electrode is provided with a means for supplying a gas toward the plastic film, and the plastic is disposed upstream of the electrode in the running direction of the plastic film. That is, gas supply means for the film is provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG.
Is disposed at a predetermined interval from the counter electrode roll 2 and is disposed above the counter electrode roll 2 in the illustrated example. The corona discharge electrode 1 is contained in a bottomed cylindrical or box-shaped hood 3 having an open facing surface.
Are provided with gas supply passages 4 and 5 as gas supply means for supplying gas into the hood 3. The gas supply passage 4 is
It is formed by a pipe such as a pipe, and is drawn through a wall surface 3 a of the hood 3 into a hole 1 a formed inside the corona discharge electrode 1. The gas supply passage 4 has a gas supply port 4 a opened toward the counter electrode roll 2,
Gas can be introduced directly into the corona discharge. The corona discharge electrode 1 is formed in a divided structure, and a hole 1a for providing the gas supply passage 4 and the like are formed therein. By branching the gas supply passage 4 inside the corona discharge electrode 1, gas can be injected from a plurality of gas supply ports 4a.

On the other hand, the gas supply passage 5 is formed by a pipe such as a pipe, and is introduced into the hood 3 through the wall 3a of the hood 3. This gas supply passage 5
A gas supply port 5a is opened on the upstream side of the corona discharge electrode 1 in the running direction of the plastic film 6 conveyed between the corona discharge electrode 1 and the counter electrode roll 2. The gas supply passage 5 removes the entire gas in the hood 3 and removes the air accompanying the plastic film 6, thereby enabling efficient gas introduction to the discharge unit.

The corona discharge electrode 1 and the counter electrode roll 2 are connected to a DC or high frequency high voltage power supply 7 via a cable 8, and a high voltage is applied between the corona discharge electrode 1 and the counter electrode roll 2. The plastic film 6 disposed between the corona discharge electrode 1 and the counter electrode roll 2 is subjected to a surface treatment by corona discharge. The shape of the hood 3 is not particularly limited as long as the corona discharge electrode 1 is included in the hood 3 and the discharge side of the corona discharge electrode 1 is open. However, the material needs to be an insulating material which has a barrier property for the gas used and does not hinder the discharge treatment. The material of the gas supply passage 4 is an insulating material that does not hinder the discharge processing, and needs to withstand heat generated during the discharge processing. The lower end of the opening of the hood 3 is a distance that does not contact the plastic film 6.

Then, a gas is supplied into the hood 3 from the gas supply ports 4a and 5a, and a high voltage is applied between the corona discharge electrode 1 and the counter electrode roll 2 in a gas atmosphere. Thus, a corona discharge is generated between the corona discharge electrode 1 and the counter electrode roll 2, and the corona discharge electrode 1 and the counter electrode roll 2
The surface treatment of the plastic film 6 disposed therebetween is performed by corona discharge. The gas supplied from the gas supply passage 4 directly introduces the gas into the discharge part, and enables a discharge treatment in a highly efficient gas atmosphere. Since gas can be introduced directly into the discharge part and discharge treatment in a highly efficient gas atmosphere is possible,
The amount of gas introduced into the hood 3 can be reduced as compared with the conventional case. The gas supplied from the gas supply passage 5 is
Gas replacement and plastic film 6 in the hood 3
The air accompanying the gas is removed, and efficient gas introduction into the discharge part is enabled. Since air accompanying the transport of the plastic film 6 can be removed and air can be prevented from entering the discharge portion between the discharge electrode 1 and the counter electrode roll 2, efficient corona treatment can be performed in a gas-replaced state. .

The present invention is not limited to the above-described embodiment. For example, the gas supply passages 4 formed in the corona discharge electrode 1 may have any shape or number. Also, the position of the gas supply passage 5 is desirably on the upstream side of the discharge electrode 1, but may be disposed on the downstream side. In this case, the direction of the gas supply passage 5 is opposite to that in the illustrated example. In addition, it goes without saying that the present invention can be carried out with appropriate changes within a scope that does not change the gist of the present invention.

[0012]

As described above, the plastic film discharge treatment apparatus according to the present invention has the following effects. A discharge electrode surrounded by a hood is disposed facing the counter electrode roll, and a voltage is applied between the discharge electrode and the counter electrode roll, and the surface of the plastic film disposed between the discharge electrode and the counter electrode roll is cleaned. In the discharge treatment apparatus for the plastic film to be modified, the discharge electrode is provided with a gas supply means for supplying a gas toward the plastic film, so that the gas is directly introduced into the discharge portion and a high-rate gas atmosphere is used. Discharge processing can be performed, and the amount of gas introduced into the hood can be reduced as compared with the related art. Further, a discharge electrode surrounded by a hood is arranged opposite to the counter electrode roll, a voltage is applied between the discharge electrode and the counter electrode roll, and a plastic film disposed between the discharge electrode and the counter electrode roll is formed. In the plastic film discharge treatment apparatus for modifying the surface, gas supply means for the plastic film is provided on the upstream side of the electrode in the running direction of the plastic film, so that air accompanying the transport of the plastic film is removed, and the discharge electrode is removed. This prevents air from entering the discharge section between the electrode roll and the counter electrode roll, and enables efficient corona treatment in a gas replacement state. Further, a discharge electrode surrounded by a hood is arranged opposite to the counter electrode roll, a voltage is applied between the discharge electrode and the counter electrode roll, and a plastic film disposed between the discharge electrode and the counter electrode roll is disposed. In a discharge treatment apparatus for a plastic film whose surface is modified, a means for supplying a gas toward the plastic film is provided on the discharge electrode, and a gas supply for the plastic film is provided on an upstream side of the electrode in a running direction of the plastic film. Since the means is provided, the gas can be directly introduced into the discharge portion to perform the discharge treatment in a highly efficient gas atmosphere, and the amount of gas introduced into the hood can be reduced as compared with the conventional case. In addition, by providing a means for introducing gas from the upstream of the electrode, air accompanying the transport of the plastic film is removed, air is prevented from entering the discharge part between the discharge electrode and the counter electrode roll, and gas replacement is performed. It enables efficient corona treatment in the state.

[Brief description of the drawings]

FIG. 1 is a conceptual cross-sectional view illustrating a plastic film discharge treatment apparatus according to an embodiment of the present invention.

FIG. 2 is a conceptual sectional view showing an example of a conventional plastic film discharge treatment apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corona discharge electrode 2 Counter electrode 3 Hood 4,5 Gas supply passage (gas supply means) 6 Plastic film 7 Power supply 8 Cable 4a, 5a Gas supply port

Claims (3)

[Claims] 1. A discharge electrode surrounded by a hood is disposed facing a counter electrode roll, and a voltage is applied between the discharge electrode and the counter electrode roll to be disposed between the discharge electrode and the counter electrode roll. A plastic film discharge treatment apparatus for modifying the surface of a plastic film, wherein the discharge electrode is provided with gas supply means for supplying a gas toward the plastic film. 2. A discharge electrode surrounded by a hood is disposed opposite to the counter electrode roll, and a voltage is applied between the discharge electrode and the counter electrode roll to be disposed between the discharge electrode and the counter electrode roll. A plastic film discharge treatment apparatus for modifying the surface of a plastic film, wherein gas supply means for the plastic film is provided upstream of the electrode in the running direction of the plastic film. 3. A discharge electrode surrounded by a hood is disposed facing the counter electrode roll, and a voltage is applied between the discharge electrode and the counter electrode roll to be disposed between the discharge electrode and the counter electrode roll. In a plastic film discharge treatment apparatus for modifying the surface of a plastic film, the discharge electrode is provided with a means for supplying a gas toward the plastic film, and a plastic film is provided upstream of the electrode in a running direction of the plastic film. A discharge treatment apparatus for a plastic film, wherein a gas supply means for the plastic film is provided.