JPH0459039A - Corona-discharge treating device - Google Patents

Abstract

PURPOSE:To stably carry out various treatments at all times by a corona discharge by controlling the temp. and humidity in a housing, in which a material to be treated is interposed between electrodes and a corona discharge is generated, respectively in a specified range by a heat insulating means and a dehumidifying means. CONSTITUTION:A material 4 to be treated is interposed between two opposed electrodes 2 and 5, and a corona discharge is generated to treat the material 4 in a specified way. In this case, an almost enclosed housing 1 in which the electrode(2 and 5 are provided and capable of charging and discharging the material 4 is furnished. The temp. and humidity in the housing 1 are controlled respectively in a specified range by a hot air feed pipe 1a and a dry air feed pipe 1b. Consequently, various treatments by a corona discharge are stably carried out at all times irrespective of the environmental conditions in the treatment.

Description

[Detailed description of the invention] [Industrial application field]

TECHNICAL FIELD The present invention relates to a corona treatment apparatus used when surface treatment of a workpiece is continuously performed by corona discharge.

[Conventional technology]

Conventionally, this type of corona treatment apparatus has been used to treat objects to be treated, for example, sheet-like bodies made of olefin foam resin.
It is known that the device is configured to continuously perform surface treatment and the like using corona discharge to improve wettability, but this device is usually placed in the same environment throughout all four seasons. Therefore, although it is known that corona discharge is affected by the surrounding environment, that is, the ambient temperature, humidity, etc., conventional corona treatment equipment does not respond well to changes in temperature and humidity during surface treatment, etc. No countermeasures were taken.

[Problem to be solved by the invention]

However, when performing certain treatments such as surface treatment,
Because corona discharge is affected by the environment, it is not possible to perform it stably throughout all four seasons. In other words, in winter, especially in an environment where the ambient temperature is 10[℃] or less, the processing speed is extremely low compared to normal temperature, and in summer, especially in the rainy season, when the relative humidity is 80% The present invention has been made to solve the problems of the prior art, in which the processing speed is extremely reduced even when the humidity is higher than RH. An object of the present invention is to provide a corona treatment device that can perform various treatments using corona discharge stably at all times.

[Means to solve the problem]

In order to achieve the above object, the present invention is configured to perform a predetermined treatment on the object by interposing the object between two opposing electrode sections and causing corona discharge. In the corona treatment apparatus, a housing is provided which is formed in a substantially sealed state, in which both the electrode parts are disposed, and in which the object to be treated can be carried in and taken out, and the temperature and humidity inside the housing are controlled. What is claimed is: 1. A corona treatment device characterized by comprising a heat retaining means and a dehumidifying means for setting the respective values within predetermined ranges.

[Effect]

For example, even if the weather environment at the time of processing is cold or humid, when the material to be processed is brought into the housing, the temperature and humidity inside the housing will be controlled by heat retention means or dehumidification means. It can be set within a predetermined range, and the processing speed of the object to be processed by corona discharge can be kept within a constant range at all times.

【Example】

FIG. 1 shows a first embodiment in which the present invention is applied in the case where the surface treatment of the object to be treated, that is, the wettability improvement treatment by, for example, the generation of carbonyl groups, is carried out by corona discharge. A dielectric rotating roll 2 serving as a grounding electrode is provided approximately in the center of the casing 1 made of a heat insulating material, and a pair of guide rolls 3 are provided on both sides of the rotating roll 2 below the rotating roll 2. ing. Then, a sheet-shaped body 4 made of, for example, a foamed olefin resin as an object to be processed is placed between one guide roll 5, the rotating roll 2, and the other guide roll 5.
The sheet-like body 4 is sequentially wound around the housing 1.
It runs from one side wall (right side in the figure) to the other side wall (left side in the figure). Furthermore, the rotating roll 2
A rod-shaped electrode 5 serving as an electrode section for applying high frequency and high voltage is provided above the sheet-like body 4 wound around the sheet body 4 . The housing 1 is formed in a substantially sealed state;
A ventilation pipe 1a for supplying hot air as a heat retention means is provided on one side wall of the lower part of the housing 1, and a ventilation pipe 1b for supplying dry air as a dehumidification means is provided on the other side wall of the lower part. An exhaust pipe 1c is provided at the top. Since the present embodiment is configured as described above, when the sheet-like body 4 travels within the casing 1 as the rotating roll 2 rotates, corona discharge occurs between the electrode 5 and the rotating roll 2. By A, the wettability improvement treatment on the surface of the sheet-like body 4 is continuously performed. In this case, the temperature inside the housing 1 is low, and therefore the sheet-like body 4 is within a temperature range (10 to 130 [
t]), hot air is supplied through the ventilation pipe 1a to raise the temperature inside the casing 1 and, in turn, to raise the temperature of the sheet-like body 4.
aims to heat up the On the other hand, when the humidity inside the housing 1 is higher than the humidity range suitable for the surface treatment (5 to 60 [%RH:]),
Humid air inside the housing 1 is exhausted by the exhaust action through the exhaust pipe 1c, and dehumidified dry air is introduced into the housing 1 through the air guide pipe 1b. That is, for example, the humidity inside the housing 1 is maintained at a constant value of 40 [%RH], and the temperature is maintained within a predetermined range (30 to 6% RH).
If maintained at 0['C]), the processing speed by corona discharge is
It can be set to a constant value of a large value (for example, 30 to 40 [m/m1nd). In this case, the humidity is lower than the above value, e.g. 30%.
If it is maintained at a constant value around RHI, corona discharge will be stabilized and better results will be obtained. FIG. 2 shows a second embodiment of the invention. The difference between this embodiment and the first embodiment is that the dome-shaped housing 1
A heating drum 6 is arranged adjacent to the rotary roll 2 inside. In the case of this embodiment, the sheet-like body 4 carried into the housing 1 from the left side of the figure first comes into contact with the heating tram 6 and is sufficiently heated to a predetermined temperature by thermal conduction, and then is transferred to the rotating roll 2. When wound, it is interposed between the electrode 5 and the rotating roll 2 in a uniform and sufficiently heat-retained state, and the surface treatment by corona discharge is efficiently performed. That is, if the heating drum 6 is used as in this embodiment,
Compared to simply raising the temperature inside the casing 1, heating and heat retention of the sheet-like body 4 become more effective, and processing by corona discharge can also be performed stably.

【Effect of the invention】

As described above, the present invention is configured to perform a predetermined treatment on the object by interposing the object between two opposing electrode parts and causing corona discharge. The lid made of corona treatment is formed in a substantially airtight state, and is provided with a housing in which both the electrode parts are disposed inside and in which the object to be treated can be carried in and taken out, and the temperature inside the housing is The device is characterized by being equipped with a heat retaining means and a dehumidifying means for setting the humidity within a predetermined range, so that the device can be installed without being affected by the environment in which it is installed, especially the weather environment during processing. It is possible to maintain the ambient air within a predetermined range, avoid low temperatures and high humidity conditions that impede improvement in processing speed, and process objects at a desired processing speed and in a stable state.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the invention, and FIG. 2 is a sectional view showing another embodiment of the invention. (Explanation of symbols) 1... Housing, 1a... Hot air supply pipe (thermal insulation means), 1
b... Cold air supply pipe (dehumidifying means), 4... Sheet-shaped body (processed material), 6... Heating drum (heat retaining means). Patent applicant: Sekisui Chemical Co., Ltd. Representative Hiroshi1) Kaoru

Claims (1)

[Claims] (1) In a corona treatment apparatus configured to perform a predetermined treatment on a workpiece by interposing the workpiece between two opposing electrode parts and causing corona discharge, the workpiece is substantially sealed. A housing is provided in which both the electrode portions are disposed inside and the object to be processed can be carried in and taken out, and the temperature and humidity inside the housing are set within predetermined ranges. 1. A corona treatment device characterized by being provided with heat retention means and dehumidification means for