JPS6085931A - Inner surface treating device of macromolecular tube - Google Patents

Abstract

PURPOSE:To enable to make electrical discharge treatment of an adhesive agent at a step and curvilinear part or even a joint part of a macromolecular tube, by forming a device making electric discharge treatment of an inside surface layer of a hard macromolecular tube so as to move along an outside surface of the tube. CONSTITUTION:Carbon monoxide is introduced by a steel gas cylinder 12 from one side of a hard macromolecular tube 1 and sucked by a vacuum pump 13 from the other side of the tube 1, through which inner gas pressure is kept at an appropriate state. When voltage is applied to an induction coil 3 by making use of high voltage power source 5 and a matching circuit 4 under the above state, an electrode is formed. With this construction, a plasmic state is caused to the macromolecular tube and the inside of the macromolecular tube is modified. In this instance, as the tube is prevented from softening through heating from an induction coil part, the induction coil 3 is arranged on a heat insulating ring 2' represented by a cylindrical ceramics in a winding state. Three rollers 15 are provided between an inner circumferential surface of the heat insulating ring 2' and an external circumferential surface of the macromolecular tube 1 and made movable on the external circumference of the macromolecular tube.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a surface treatment apparatus for a polymer tube that performs electrical discharge treatment on the inner surface layer of a hard polymer tube.

[Background of the invention]

The inner surface of polymer tubes, typified by vinyl chloride, has many drawbacks such as the elution of plasticizers, and for this reason, various inner surface treatments are being carried out.

Conventionally, this type of internal surface treatment device will be described with reference to @11 bacteria. In the figure, 1 is a polymer tube, and this polymer tube 1 is insulated into an insulating tube 2. The 10 side of the illustrated polymer tube 1 is connected to a gas introduction system for reducing the pressure difference between the inside and outside of the polymer tube 1, and the 11 side is connected to a gas exhaust system. 1 is maintained at the optimum gas pressure for discharge treatment.

The insulating tube 2 is usually made of glass, has a discharge treatment section in the center, and exhaust sections on both sides. 7.8 of insulation tube 2.
Reference numeral 9 is connected to the exhaust system, and the introduction of the polymer tube 1 eliminates the minute amount of air entering the system. Reference numeral 6 denotes a gas introduction section for introducing gas into the insulating tube 2. Reference numeral 3 denotes an induction coil, which is wound around the insulating tube 2, and is connected to the high voltage power source 5 via a matching circuit 4.

With the above configuration, the polymer tube 1 and the insulating tube 2
When a predetermined gas pressure is maintained within the chamber, the outputs of the high voltage power supplies 5 are matched by a matching circuit 4, and then applied to the insulating tube 2 and the polymer tube 1 through the induction coil 3. Electric discharge starts on the inner surface.

The problem with the above-mentioned device is that the device is expensive for treating polymer tubes with pM <it. That is, the insulating tube must be rearranged, cooling gas must be allowed to flow inside the tube, and the pressure of the sludge must be fully adjusted. In addition, the induction coil cannot be moved in the +tl+ direction relative to the 11-3 molecular tube, and therefore, if the polymer tube is long, uniform treatment cannot be performed in the longitudinal direction of the surface molecule tube, resulting in uneven treatment. be.

In the case of the above system, it is fine if the polymer tube is directly connected, but if it is incorporated as a piping system, it may become curved or there may be a step at the connection of the piping. There is a drawback that it cannot be applied if

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for treating the inner surface of a polymer tube, which performs discharge treatment on the inner surface layer of a hard polymer tube along the outer surface of the tube.

[Summary of the invention]

Conventionally, the internal pressure of the polymer tube was set at 10 to 100 mmHg.
Then, a gas such as N2, Ar, Co, etc. is introduced into the tube and a high tK pressure is applied to the induction coil around the tube to generate plasma gas inside the tube. When performing plasma surface treatment, The tube may contract due to the difference in pressure inside and outside the tube, causing pinholes or
Stable plasma surface treatment can be continued even if it breaks.1
In order to prevent this, an insulator tube is further provided on the outside of the tube, and gas having the same pressure as the tube internal pressure is caused to flow between the tube and the insulator tube to eliminate the pressure difference between the inside and outside of the tube.

However, although this is primarily an effective measure for soft tubes, in the case of hard polymer tubes, which are the subject of this invention, a pressure difference between the inside and outside of about 1 atm can cause the tube to shrink or break due to the stress. It is absolutely impossible to do that. Therefore, it is not necessary to provide an insulator tube and to flow gas between the tubes to eliminate the pressure difference between the inside and outside of the tube. Therefore, in the present invention, there is no problem even if the induction coil is directly provided outside the hard polymer tube. However, depending on the compatibility of the tube, the tube may soften due to the heat generated in the induction coil section, so in order to prevent this, between the polymer tube and the induction coil section, For example, a heat insulating material such as ceramics or asbestos (asbestos) is provided.

In addition, conventionally, when the polymer tube is very long, the induction coil part is fixed in the longitudinal direction of the tube, so the high frost and pressure application conditions based on the induction coil action are
This method does not work well in areas far away from the induction coil, and has the disadvantage that the plasma surface treatment effect is uneven. Therefore, in the present invention, the induction coil is of a movable type, and the outer periphery of the 14-polymer tube is used as a guide, so that it can be freely moved in the longitudinal direction of the tube. Oh yeah
For hard polymer tubes, the piping joints are adhesive.

This adhesive then elutes into ultrapure water and lowers the water's pt.Therefore, it is of course effective to prevent elution by plasma surface treatment of hard polymer tubes at the stage of a single tube of a fixed length. However, it is most effective to use an adhesive after the piping has been completed, as it can insolubilize not only the inner surface of the tube but also the adhesive part. r+tlj % Polymer tube + d, there are not necessarily straight parts but also curved parts, and there is a step in the outer diameter of the tube at the joint part where an adhesive is used.

Taking these circumstances into consideration, the present invention is designed to allow not only linear movement in the longitudinal direction of the tube, but also movement in curved portions and movement in stepped portions.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 2 to 5.

Also shown in Fig. 2, 1 is a hard 14 polymer tube with a thermal ring 2' arranged around its outer periphery. +JV
A C induction coil 3 is installed. This induction coil 3 is connected to a height 711. Wang, J1] Connected to F5.

1111! 'I'i A gas cylinder 12 is attached to one side of the polymer tube, and a part of a vacuum pump 13 is attached to the other side (this is partially attached to a vacuum pump 13).

Figure 3 faces the second and first A-A 'Ijj diagram. In the figure, a roller 15 is attached to the inner surface of the heat insulating ring 2' via an elastic body 14 such as a spring, and the heat insulating ring 2' is supported by the outer peripheral surface of the polymer tube 1.

Since the present invention has the above-mentioned configuration, a gas such as carbon monoxide is introduced from one side of the duplex 1 through the gas cylinder 121C, and is sucked from the other side by the vacuum pump 13, so that the internal waste pressure is maintained at 1 quotient u) (tube internal pressure of about 10 to 100 mm F1 g). In this state, high Fi+, piezoelectric @ (about 13,56M112)5
And if we apply 'l111 pressure to the induction coil 3 using the matching circuit 4; The plasma surface treatment action of is activated, and
H4,.

The inner surface of the molecular tube is modified. At this time, in order to prevent the duplex from softening due to heat generated from the induction coil section, the induction coil 3d is arranged so as to be wound around a heat insulating ring 2', typically made of cylindrical ceramics or the like. Between the inner periphery of the heat insulating ring 2' and the outer periphery of the molecular tube 1, three movable rollers 15 are used to uniformly press the outer periphery of the molecular duplex via elastic bodies such as springs 14. , 1 conductive coil 3 is configured to be freely movable via a rotor 15 using the outer periphery of the polymer tube as a guide.

By doing this, the induction coil 3 can freely move through the straight section of the polymer tube, the stepped section of the adhesive joint 18 shown in FIG. 4, and the curved IC section shown in FIG. Becomes Noh.

As a result, even if the piping is saturated and has a considerably long length of flit (hard polymer tube piping with steps or 1llI#j!), if the three induction coils can be moved continuously, By appropriately adjusting the suction power of the vacuum pump, uniform and even plasma surface treatment can be easily performed.In particular, the adhesive 1b shown in Fig. 4 can be reliably plasma-treated, so that it can be completely treated. Perfect insolubilization treatment becomes possible.

〔Effect of the invention〕

As explained above, according to the present invention, since the device for electrical discharge treatment of the inner surface layer of the polymer tube is moved along the outer surface of the tube, it is possible to move the device along the outer surface of the tube. The adhesive of the parts can also be discharge treated.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of a conventional inner surface treatment device for δ-shaped molecular tubes, Figure 2 is a schematic sectional view of the inner surface treatment device for polymer tubes of the present invention, and Figure 3 is a schematic cross-sectional view of the inner surface treatment device for polymer tubes of the present invention. AA sectional view in the figure, FIG. 4 is a sectional view showing the joint part of the high 4 child tube,
FIG. 5 1'j is a schematic diagram showing the curved part of the A molecular tube. 1... Polymer tube, 2... Ray tube to Xf, 2'.
...Insulation h゛F, 3...Induction coil, 4...Matching circuit, 4'M pressure main power supply 12...Gas +1-
, /-2,13...Vacuum pump, X4...'31H+
Gender body, 15・r7-ra. I 1 Figure 20 Ha14 Lenini・□, 1b Koichino/C

Claims (1)

[Claims] 1. In a polymer tube inner surface treatment apparatus for discharging the inner surface layer of a hard polymer tube, a heat insulating ring is arranged around the outer periphery of the hard polymer tube, and an induction coil is arranged around the outer periphery of the heat insulating ring. What is claimed is: 1. An inner surface treatment device for a polymer tube, characterized in that the inner surface treatment device comprises a device for moving the inner surface treatment device along the hard molecule tube. 2. The inner surface of the polymer tube according to claim 1, wherein the moving device of the inner surface treatment device has a roller that moves the outer surface of the hard polymer tube attached to the inner surface of the heat insulating ring. Surface treatment equipment. 3. The roller moving around the outer circumferential surface of the hard polymer tube has a pressure resistance between the roller and the heat insulating ring. An apparatus for treating the inner surface of a West Molecule tube according to Item 2. 4. The apparatus for treating the inner surface of a polymer tube according to claim 1, wherein the heat insulating ring is made of ceramic. 5. The inner surface treatment device for a polymer tube as claimed in claim 1, wherein the heat insulating ring is made of asbestos.