JP4430209B2 - Plastic tube manufacturing apparatus having inner surface processing function, and inner surface processing plastic tube manufacturing method using the apparatus - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to an apparatus capable of continuously producing a plastic tube whose inner surface is treated with atmospheric pressure glow discharge plasma, and a method for producing an inner surface-treated plastic tube using the apparatus.
[0002]
[Prior art]
In recent years, a technique for generating glow discharge plasma under atmospheric pressure has been developed and used in various applications. In this technique, a plasma generating gas such as helium is introduced into a discharge part formed between a high-pressure electrode and a ground electrode facing each other with a certain interval at atmospheric pressure or near atmospheric pressure, and between the electrodes. A glow discharge plasma is generated in the discharge part by applying a high-frequency AC voltage.
[0003]
Compared with the conventional plasma treatment under vacuum, the method of surface treatment such as surface modification and thin film formation using atmospheric pressure glow discharge plasma is a device for forming a low-pressure atmosphere and pressure control. Do not need. For this reason, it is used suitably in the field | area which needs to process a large area continuously like a film and a sheet | seat. As a method for securing a plasma generating gas region when performing such a process, a large number of air holes are provided in the electrode, and plasma generating gas is supplied from the air holes, or a material to be processed is introduced and carried out. It has been proposed to surround a processing region with a chamber having a minimum opening and continuously supply a plasma generating gas to the region.
[0004]
On the other hand, as a continuous processing technology for the inner surface of a plastic tube by atmospheric pressure glow discharge plasma, JP-A-8-57038 stably generates glow discharge under pressure near atmospheric pressure while continuously extruding the tube with an extruder. A method for producing a plastic tube, comprising: forming a thin film on a substrate to be treated by applying an AC voltage in an atmosphere of a mixed gas of a gas to be treated and a treatment gas to perform an atmospheric pressure glow discharge plasma treatment It is disclosed. However, in this case, when processing the tube inner surface, the plasma generating gas is continuously introduced from the gas introduction line installed in the annular die with the lower end of the tube open to the atmosphere. Atmospheric pressure glow discharge plasma treatment. In the drawing shown in the publication, the winding drum is provided with a mechanism (gas exhaust port) for releasing gas to the atmosphere. However, in order to keep the plasma processing region at a pressure close to atmospheric pressure, The introduced gas remains in the plastic tube wound up after the atmospheric pressure glow discharge plasma treatment and is bulky, and it is difficult to continuously wind up the long tube. In particular, it was practically impossible to continuously wind a wide tube. Further, in this method, a large amount of expensive plasma generating gas such as helium (rare gas) must be continuously introduced in a large amount, which increases the cost and is difficult to use for surface treatment of general-purpose plastic films. It was a thing.
[0005]
[Problems to be solved by the invention]
The present invention was made to solve such problems, and by utilizing the characteristics of the inflation plastic tube manufacturing process, it is not necessary to constantly introduce a large amount of expensive plasma generating gas, To provide a plastic tube manufacturing apparatus having a completely new inner surface processing function capable of continuously winding a long length even with a wide tube, and to provide a manufacturing method of an inner surface processing plastic tube using the apparatus. It is to be an issue.
[0006]
[Means for Solving the Problems]
In the blown plastic tube manufacturing process, the inside of the plastic tube from the annular die to the nip roll is a closed system. The gist of the present invention is that a glow discharge plasma is generated in this closed space, and if the inner surface of the plastic tube is processed thereby, there is no gas in the tube in the process after the nip roll, and the long tube continues continuously. And found that it can be wound. Further, it has been found that it is not necessary to constantly introduce a large amount of expensive plasma generating gas such as helium (rare gas). As a result, it has been found that a plastic tube whose inner surface has been treated can be manufactured continuously with great advantage in terms of cost, and the present invention has been achieved. That is, the present invention
[1]: Extruder equipped with an annular die, an apparatus provided with a nip roll for taking out a cooled and solidified plastic tube extruded from the annular die at a predetermined speed, and the plastic tube is pinched by the nip roll during operation. A gas supply line for supplying a glow discharge plasma generating gas or a mixed gas of a glow discharge plasma generating gas and a processing gas in a closed space formed by the ground, and a grounded ground electrode and a high-voltage AC power source It has an inner surface treatment function characterized in that it can generate an atmospheric pressure glow discharge plasma in a plastic tube by applying an AC voltage between the ground electrode and the high voltage side electrode. A plastic tube manufacturing apparatus is provided.
[0007]
[2]: One of the ground electrode and the high-voltage side electrode is disposed in a closed space formed by the plastic tube being pinched by a nip roll during operation, and the other is disposed outside the closed space formed during operation. In addition, the present invention provides a plastic tube manufacturing apparatus having an inner surface treatment function according to [1], wherein a ground electrode and a high-voltage side electrode face each other.
[0008]
[3]: A plastic tube manufacturing apparatus having an inner surface processing function according to [1] or [2], further comprising a gas discharge line for discharging gas from a closed space formed during operation. Is.
[0009]
[4]: Using the plastic tube manufacturing apparatus according to any one of [1] to [3], a glow discharge plasma is formed in a closed space formed by pinching a plastic tube extruded from an annular die by a nip roll. After replacing with the generating gas, an AC voltage is applied between the ground electrode and the high-voltage side electrode, and the inner surface of the plastic tube is treated by generating an atmospheric pressure glow discharge plasma in the enclosed space. A method for producing an internally treated plastic tube is provided.
[0010]
[5]: Glow discharge plasma generating gas or glow discharge plasma in a closed space formed by pinching a plastic tube extruded from an annular die with a nip roll using the plastic tube manufacturing apparatus according to [3]. By supplying a mixed gas of the generating gas and the processing gas and appropriately discharging these gases, the gas concentration and pressure in the closed space are maintained at predetermined values, and between the ground electrode and the high-voltage side electrode. A method for manufacturing an inner surface-treated plastic tube, wherein an inner surface of a plastic tube is treated by applying an alternating voltage and generating an atmospheric pressure glow discharge plasma in a closed space.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The plasma treatment in the present invention is the physical and chemical modification of the surface by the plasma generated only by the plasma generating gas, the surface physics by the generated plasma by adding a small amount of the processing gas to the plasma generating gas. It means each plasma surface modification such as mechanical and chemical modification, and thin film formation on the surface such as plasma CVD and plasma graft polymerization, and is not limited to one. Further, surface chemical modification such as grafting with a reactive monomer or the like based on a chemically active species such as radicals or ions generated on the inner surface of the tube by the treatment of the present invention is performed as a subsequent step of the plasma treatment. It is also possible.
[0012]
A plastic tube manufacturing apparatus having an inner surface processing function will be described in more detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an embodiment of a plastic tube manufacturing apparatus 1 having an inner surface treatment function of the present invention. FIG. 2 is a schematic cross-sectional view taken along the line AA ′ of FIG. In this embodiment, the plastic tube manufacturing apparatus is an ordinary inflation tube film forming apparatus including the extruder 4, the air ring 9, the stabilizing plate 62, the nip roll 61, the take-up roll 63 and the like equipped with the annular die 5. A gas supply line (a plasma introduction gas introduction line 72 and a processing gas introduction line 71) that passes through the inside of the annular die and penetrates into a region surrounded by the die lip of the annular die, and a gas discharge line 73 are provided. Due to such a structure, during operation, the glow discharge plasma generating gas or the mixture of the glow discharge plasma generating gas and the processing gas is mixed in a closed space formed by pinching the plastic tube by the nip roll. Gas can be supplied, and the gas concentration and pressure in the closed space can be maintained at predetermined values by appropriately discharging these gases. In addition, when performing the surface treatment by the glow discharge plasma generated in the closed space without performing the surface treatment with the treatment gas, it is not necessary to provide the treatment gas introduction line 71 among the gas supply lines, and the gas discharge line 73 is installed. Can be omitted. The plastic tube manufacturing apparatus of the present invention is equipped with a grounded ground electrode 2 for generating glow discharge plasma and a high-voltage side electrode 3 connected to a high-voltage AC power supply 10. In addition, an AC voltage can be applied between the ground electrode 2 and the high voltage side electrode 3.
[0013]
In FIG. 1, the ground electrode 2 has a cylindrical shape, and is fixed by a support 22 in a region surrounded by the die lip of the annular die 5. And it is grounded through the support tool 22 and the annular die 5. In addition, the ground electrode 2 is disposed concentrically with the die lip of the annular die 5 and is concentric with the plastic tube during operation. The outer diameter of the ground electrode 2 is set slightly smaller than the inner diameter of the plastic tube 8 to be manufactured.
[0014]
The high voltage side electrode 3 has a cylindrical shape, is attached to a frame or the like of a plastic tube manufacturing apparatus by a high voltage side electrode support 32 in an insulated state, and is connected to an AC power source 10. Here, the cylindrical high-voltage side electrode 3 is disposed concentrically with the die lip of the annular die 5 or the ground electrode 2, and the inner diameter is set slightly larger than the outer diameter of the plastic tube 8 to be manufactured. The high-voltage side electrode 3 can be divided and used in consideration of workability at the start of tube manufacture.
[0015]
The ground electrode 2 and the high-voltage side electrode 3 are opposed to a region where the tube 8 is cooled and solidified and the diameter is fixed during operation, that is, a region closer to the nip roll 61 than the so-called frost line via the tube 8 in the state of being coaxial. It is desirable to arrange in this way.
[0016]
The distance between the ground electrode 2 and the high-voltage side electrode 3 is not particularly limited as long as it is equal to or greater than the thickness of the tube, but if it is too narrow, the tube contacts each electrode and obstructs take-up, causes arc discharge, and is too wide. And does not lead to discharge. In this sense, the distance between the ground electrode 2 and the high-voltage side electrode 3 is preferably 0.5 mm to 20 mm.
[0017]
Note that it is desirable that at least one of the opposing surfaces of the ground electrode 2 and the high-voltage side electrode 3 is covered with a solid dielectric. Examples of the material of the solid dielectric include glass, ceramics, heat resistant plastics and the like. Further, as a covering form of the electrode surface, it is also preferable to form a metal oxide film by oxidizing the metal surface of the electrode. The electrode may be a mesh.
[0018]
In the present invention, the frequency of the AC voltage supplied from the AC power supply 10 for generating plasma is not particularly limited, but is preferably 0.5 kHz to 100 MHz. Further, a pulsed voltage may be applied as the AC voltage, or a DC may be superimposed on the AC voltage. As an example, a 13.56 MHz one that is often used industrially can be used. Plasma is generated by applying an AC voltage to the electrode, but the appropriate AC voltage intensity varies depending on the material, shape, size, etc. of the ground electrode and high-voltage side electrode used. Can be selected as appropriate. If the AC voltage intensity is too low, plasma cannot be generated. Conversely, if the AC voltage intensity is too high, the plasma will shift to arc discharge.
[0019]
Further, the form of the ground electrode and the high-voltage side electrode in the present invention is not limited to the form shown in FIG. 1, but for example, as shown in FIG. Even when the ground-side electrode 13 and the high-voltage side electrode 23 are mounted in a double spiral shape on the cylindrical rim body 11 made of this, atmospheric pressure glow discharge plasma can be generated in the closed space, and The inner surface of the tube can be processed. In this case, the high-voltage side electrode 3 and the ground-side electrode 2 are arranged in a double spiral along the outside of the cylindrical edge 11, but are arranged along the inside of the cylindrical edge 11. It doesn't matter.
[0020]
In the above description, when the plastic is extruded from the annular die, the so-called inflation method is exemplified in which the diameter of the plastic tube is larger than the die lip diameter of the annular die. However, the plastic having the inner surface treatment function of the present invention is exemplified. The tube manufacturing apparatus can also apply a so-called deflation method in which the diameter of the plastic tube is equal to or smaller than the die lip diameter of the annular die. From this, the atmospheric pressure of the atmospheric pressure glow discharge plasma described above should be understood as the pressure within the range of common sense to reach the closed space formed by extruding the synthetic resin from the annular die and pinching with the nip roll. It is.
[0021]
Next, a method for manufacturing an inner surface-treated plastic tube using the plastic tube manufacturing apparatus having the inner surface processing function described above will be described with reference to FIG.
[0022]
This method is for generating plasma in a closed space formed by pinching a plastic tube 8 extruded from an annular die by a nip roll 61 after starting continuous production of the tube using a normal inflation tube production process. Using the gas introduction line 72 and the exhaust line 73, the inside of the tube is replaced with a plasma generating gas such as helium while maintaining the internal pressure of the tube. Thereafter, an AC voltage is applied from the AC power supply 10 to the high-voltage side electrode 3 connected to the AC power supply 10 to form a glow discharge plasma region in the closed space and perform processing. Alternatively, after replacing the inside of the tube with a plasma generating gas such as helium, the glow discharge from the plasma generating gas introduction line 72 is performed while discharging the gas in the tube from the exhaust line 73 so as to maintain the pressure in the tube. While continuously introducing a plasma generating gas or a mixed gas of the gas and the processing gas, a glow discharge plasma region is formed in the closed space for processing. In addition, although demonstrated based on the apparatus in which a ground electrode is located in a closed space here, you may make it a high voltage | pressure side electrode be located in a closed space.
[0023]
In addition, in the case of performing the surface treatment by the glow discharge plasma generated in the closed space without performing the surface treatment by the treatment gas, it is not always necessary to use an apparatus provided with the gas discharge line 73 and the treatment gas introduction line 71. An apparatus provided with only a gas supply line for supplying gas for generating discharge plasma can be used. When this apparatus is used, the closed space is replaced with the glow discharge plasma generating gas so as to discharge the gas from the closed space while supplying the glow discharge plasma generating gas from the supply line to the closed space. Specifically, the gas in the closed space is discharged by slightly opening the nip roll or making a small hole in the plastic tube while supplying the glow discharge plasma generating gas to the closed space. Next, in the same manner as described above, a glow discharge plasma region is formed in the closed space, and processing is performed.
[0024]
The glow discharge plasma generating gas used in the present invention is a gas for generating plasma, and is preferably a rare gas or a nitrogen gas. Among the rare gases, helium is most preferable, and argon can also be suitably used.
[0025]
On the other hand, the processing gas mixed into the plasma generating gas in order to improve the processing effect is appropriately selected according to the purpose of the surface treatment. For example, in order to impart water repellency to a sheet-like material, fluorinated ethylene series hydrocarbon compounds such as tetrafluoroethylene and hexafluoropropylene, and fluorinated methane series carbonization such as tetrafluoromethane and hexafluoroethane. An organic compound having a functional group such as a hydrogen compound, a chain hydrocarbon having a side chain containing a fluorine atom, or a fluorinated aromatic hydrocarbon can be used.
[0026]
In addition, by using the following oxygen element-containing compound, nitrogen element-containing compound, etc. as the processing gas, a hydrophilic functional group such as a carbonyl group, a hydroxyl group, or an amino group is formed on the surface of the base material to increase the surface energy, thereby increasing the hydrophilicity. Can be obtained.
[0027]
Examples of the oxygen element-containing compound include oxygen, ozone, water (water vapor), carbon monoxide, carbon dioxide, nitrogen monoxide, nitrogen dioxide, alcohols such as methanol and ethanol, ketones such as acetone and methyl ethyl ketone, and methanol. And organic compounds containing oxygen elements such as aldehydes such as ethanal. A mixture of the oxygen element-containing compound and hydrogen may be used. Further, the oxygen element-containing compound may be mixed with a hydrocarbon compound gas such as methane or ethane. Moreover, hydrophilization is accelerated | stimulated by adding a fluorine element containing compound at 50 volume% or less to the said oxygen element containing compound. As the fluorine element-containing compound, the same compounds as those exemplified above may be used.
[0028]
Examples of the nitrogen element-containing compound include nitrogen and ammonia. Examples of the sulfur element-containing compound include sulfur dioxide and sulfur trioxide. Moreover, sulfuric acid can be vaporized and used.
[0029]
Further, by using a monomer having a hydrophilic group and a polymerizable unsaturated bond in the molecule as a processing gas, a hydrophilic polymer film can be deposited. Examples of the hydrophilic group include hydrophilic groups such as a hydroxyl group, a sulfonic acid group, a sulfonate group, a primary or secondary or tertiary amino group, an amide group, a quaternary ammonium base, a carboxylic acid group, and a carboxylic acid group. Can be mentioned. Similarly, a hydrophilic polymer film can be deposited using a monomer having a polyethylene glycol chain.
[0030]
As the basic skeleton of the monomer having a polymerizable unsaturated bond, acrylic acid, methacrylic acid, acrylamide, methacrylamide, N, N-dimethylacrylamide, sodium acrylate, sodium methacrylate, potassium acrylate, potassium methacrylate, styrene Examples include sodium sulfonate, allyl alcohol, allylamine, polyethylene glycol dimethacrylate, polyethylene glycol diacrylate, and the like.
[0031]
Among the monomers having a polymerizable unsaturated bond, a solid monomer is used as it is or after being dissolved in a solvent and vaporized by means such as reduced pressure.
[0032]
Further, a metal-containing gas can be suitably used as the processing gas. Examples of the metal include Al, As, Bi, B, Ca, Cd, Cr, Co, Cu, Ga, Ge, Au, In, Ir, Hf, Fe, Pb, Li, Na, Mg, Mn, Hg, Metals such as Mo, Ni, P, Pt, Po, Rh, Sb, Se, Si, Sn, Ta, Te, Ti, V, W, Y, Zn, Zr, etc. are mentioned, and the gas containing the metal is used. And processing gases such as metal organic compounds, metal-halogen compounds, metal-hydrogen compounds, and metal alkoxides.
[0033]
Specifically, the case where the metal is Si will be described as an example. Tetramethylsilane [Si (CH _Three ) _Four ], Dimethylsilane [Si (CH _Three ) ₂ H ₂ ], Tetraethylsilane [Si (C ₂ H _Five ) _Four ] Organometallic compounds such as silicon tetrafluoride (SiF) _Four ) Silicon tetrachloride (SiCl) _Four ) Silicon dichloride (SiH) ₂ Cl ₂ ) Metal halide compounds; monosilane (SiH _Four ), Disilane (SiH _Three SiH _Three ), Trisilane (SiH _Three SiH ₂ SiH _Three Metal hydride compounds such as); tetramethoxysilane [Si (OCH _Three ) _Four ], Tetraethoxysilane [Si (OC ₂ H _Five ) _Four And the like.
[0034]
If the metal-containing gas is a gas, it can be introduced into the discharge space as it is, but if it is liquid or solid, it may be introduced into the discharge space via a vaporizer. By using such a processing gas, SiO ₂ TiO ₂ , SnO ₂ It is possible to form a metal oxide thin film such as ZnO and to give an electrical and optical function to the surface of the substrate.
[0035]
In addition, the compound used as an above-mentioned process gas may be used independently and may use 2 or more types together depending on the objective. Further, the mixing ratio when the processing gas and the plasma generating gas are mixed and used is appropriately determined depending on the kind of the plasma generating gas and the processing gas to be used. Since generation of uniform discharge plasma becomes difficult even when an AC electric field is applied, the content is preferably 0.01 to 10% by volume, more preferably 0.01 to 5% by volume.
[0036]
In the present invention, the plastic capable of continuous plasma treatment on the inner surface of the tube is not particularly limited as long as the tube can be manufactured by an inflation method using an annular die. For example, polyethylene (PE), polypropylene (PP), etc. Polyolefin resin, ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, ethylene-tetrafluoroethylene copolymer, polyethylene terephthalate, polyurethane, polyamide, polyvinyl chloride, polyvinylidene chloride, polyvinylidene fluoride, polycarbonate , Polyacetal, polyester, silicone resin, acrylic resin, polyacrylic acid, polyacrylamide, polymethyl methacrylate, polyvinyl acetate, polyvinyl alcohol, polyacrylonitrile, polystyrene , Polysulfone, polyethylene oxide, polyether ether ketone, polyether sulfone, and the like, but not limited thereto.
[0037]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
[0038]
[Example 1]
A continuous production apparatus for an internally treated plastic tube as schematically shown in FIG. 1 was produced. As an inflation tube manufacturing apparatus that is the basis of the manufacturing apparatus, a lab plast mill 50MR single screw extruder (20 mm diameter, L / D25 full flight screw) manufactured by Toyo Seiki Co., Ltd. was used. An annular die having a die lip diameter of 25 mm provided with a gas introduction line and an exhaust line, and an air ring were attached thereto, and equipped with auxiliary equipment such as a stabilizer, a nip roll, and a winder. The distance from the upper surface of the die to the nip roll was about 800 mm. A ground electrode having an outer diameter of 44 mm, a thickness of 4 mm and a height of 50 mm and having an aluminum cylindrical shape is surrounded by a die lip so that its lower end is approximately 400 mm from the top surface of the die and concentric with the die slip. It was attached by a support attached to the area. Further, as shown in FIG. 1, a high-voltage side electrode having a cylindrical shape made of aluminum having an inner diameter of 48 mm, a thickness of 4 mm, and a height of 50 mm divided into two parts was installed at a position concentrically facing the internal electrode in the tube. In addition, the high-voltage side electrode divided into two parts has a structure that can be retracted in a sliding manner to improve workability at the start of manufacturing. Furthermore, a high frequency AC power source capable of applying a 13.56 MHz high frequency AC voltage was connected to the high voltage side electrode. Thus, the plastic tube manufacturing apparatus provided with the inner surface treatment function of the present invention was manufactured.
[0039]
Using the above-described apparatus, continuous production of a tube having a tube outer diameter of 46 mm and a thickness of about 100 μm was started using Sumitomo Chemical Co., Ltd. low-density polyethylene F208-0 as a raw material at a nip roll take-up speed of 1.5 m / min. Next, by operating the gas introduction line and the exhaust line, the inside of the closed space was replaced with helium while maintaining the gas pressure in the closed space and the outer diameter of the tube. Next, the high-voltage side electrode that had been divided and slid backward was returned to its original position, and installed at a position concentrically facing the ground electrode in the closed space. At this time, the distance between the tube, the ground electrode, and the high-voltage side electrode was about 1 mm. Next, when a high frequency AC voltage of 13.56 MHz was applied from the high frequency AC power source to the high voltage side electrode, plasma was generated between the tube and the ground electrode. As a result, a polyethylene tube whose inner surface was treated with glow discharge plasma was obtained. The contact angle of water on the inner surface of the untreated polyethylene tube with respect to water was 98.5 °, whereas that on the inner surface of the polyethylene tube after treatment was 75.4 °, clearly showing a treatment effect.
[0040]
[Example 2]
After replacing the closed space with helium, and operating the gas introduction line and the exhaust line, plasma was generated while continuously introducing 5 L / min of helium and 1 mL / min of oxygen. The same treatment experiment was performed. Here, the position of the opening of the gas introduction line in the closed space was set below the electrode, and the opening of the gas exhaust line was set above the electrode. As a result, a polyethylene tube whose inner surface was treated with glow discharge plasma was obtained. The contact angle of water on the inner surface of the untreated polyethylene tube with respect to water was 98.5 °, whereas that on the inner surface of the polyethylene tube after treatment was 70.6 °, clearly showing a treatment effect.
[0041]
【The invention's effect】
As described above, according to the present invention, a plastic tube manufacturing apparatus having a completely new inner surface processing function utilizing the characteristics of the inflation method plastic tube manufacturing process is provided, and an inner surface processing plastic tube using the same apparatus is provided. A manufacturing method is provided. The apparatus and the method have a feature that a long tube can be continuously wound even with a wide tube, and a large amount of expensive plasma generating gas is not required and the processing cost is low.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an embodiment of a continuous plasma surface treatment apparatus of the present invention.
FIG. 2 is a schematic cross-sectional view taken along the line AA ′ in FIG.
FIG. 3 is a schematic cross-sectional view showing an embodiment of a continuous plasma surface treatment apparatus of the present invention.
[Explanation of symbols]
1. Plastic tube manufacturing equipment
2. Ground electrode
22. Ground electrode support
3. High voltage side electrode
32. High voltage side electrode support
4). Extruder
5). Annular die
61. Nip roll
62. Stabilizer
63. Winding roll
71. Process gas introduction line
72. Gas introduction line for plasma generation
73. Exhaust line
8). Tube (object to be processed)
9. Air ring
10. AC source
11. Relative

Claims (3)

An extruder equipped with an annular die, a device equipped with a nip roll for pulling out a cooled and solidified plastic tube extruded from the annular die at a predetermined speed, and formed by pinching the plastic tube by the nip roll during operation A gas supply line for supplying a glow discharge plasma generating gas or a mixed gas of a glow discharge plasma generating gas and a processing gas is provided in a closed space, and atmospheric pressure is applied to the plastic tube by applying an alternating voltage. It has a grounded ground electrode for generating glow discharge plasma and a high-voltage side electrode connected to a high-voltage AC power source, and one of the ground electrode and the high-voltage side electrode is pinched by a nip roll during operation. Is placed in a closed space formed by The ground electrode and the high-voltage side electrode are cylindrical, and are arranged in concentric positions so that the distance between the ground electrode and the high-voltage side electrode is 0.5 mm to 20 mm. plastic tubes continuous manufacturing apparatus having an inner surface processing function, characterized in that there. Plastic tubes continuous manufacturing apparatus having an inner surface processing function according from the closed space formed in claim 1, characterized in further comprising Rukoto a gas discharge line for discharging the gas during operation. Using the plastic tube continuous manufacturing apparatus according to claim 1 or 2, after replacing the closed space formed by pinching the plastic tube extruded from the annular die with a nip roll with a glow discharge plasma generating gas, A method of manufacturing an inner surface-treated plastic tube, wherein an inner surface of a plastic tube is treated by applying an AC voltage between a ground electrode and a high-voltage side electrode and generating an atmospheric pressure glow discharge plasma in a closed space.

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