JPH06306606A - Method and device for production inner face-treated thin pipe - Google Patents

Abstract

PURPOSE:To efficiently implant an ion and to continuously and efficiently obtain an inner face-treated thin pipe by inserting a hollow pipe for conducting the ion into the thin pipe and isolating the inside of the hollow tube from the outside by a membrane. CONSTITUTION:A hollow pipe 44 is inserted into a thin pipe P made of a polymer material. A membrane 48 is fixed to the tip of the hollow pipe 44, and the inside of the hollow pipe 44 is airtightly isolated from the die 46 side. A cylinder 41 is heated, and a material P' is introduced from a hopper 43. A hollow screw 44 is rotated to transport the molten material P' toward the die 46. The molten material P' is cooled by the die 46 and extruded from a gap between the die 46 and a protruding rod 49 to form the thin pipe P. Under these conditions, the inner face of the thin pipe P is irradiated with an ion through the membrane 48. As a result, the thin pipe P having a small diameter is continuously produced while treating its inner face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing an inner surface-treated thin tube, and more particularly to a method and an apparatus for manufacturing an inner surface-treated thin tube for manufacturing a thin tube whose inner surface is treated by ion implantation.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 62-74633 proposes a "method for producing a conductive thermoplastic resin tube". This is a thermoplastic resin tube extruded from an extruder, passed through the inside of the ion implanter to be externally treated,
It imparts conductivity to the outer surface. Further, the thermoplastic resin tube extruded from the extrusion molding machine is passed through the outside of the ion implantation device to be subjected to inner surface treatment to impart conductivity to the inner surface.

[0003]

PROBLEMS TO BE SOLVED BY THE INVENTION Since capillary tubes made of a polymer material used in the medical field such as artificial blood vessels and catheters are required to have antithrombotic properties, biocompatibility, antibacterial properties, sterilization properties, etc.
Surface treatment is required. Further, surface treatment is also required for thin tubes for food transportation. The outer surface of the thin tube can be treated by applying the above-mentioned “method for producing a conductive thermoplastic resin tube”. However, the inner surface treatment of the thin tube is impossible. This is because it is impossible to put the ion implanter inside the thin tube. Then, the objective of this invention is to provide the manufacturing method and manufacturing apparatus of the inner surface treatment thin tube which can manufacture suitably the inner surface treated thin tube.

[0004]

According to a first aspect of the present invention, the present invention provides a hollow tube provided with a membrane body at the tip of the hollow tube, the membrane body being capable of passing ions and airtightly blocking the inside of the hollow tube. Insert into the thin tube of molecular material, abut the hollow tube tip to the inner surface of the thin tube to form the thin tube to a predetermined diameter, and evacuate the inside of the hollow tube from the outside of the hollow tube to the inside of the hollow tube. Provided is a method for producing an inner surface-treated thin tube, which comprises introducing ions to the tip of a hollow tube and irradiating the inner surface of the thin tube with the ions through the membrane.

In a second aspect, extrusion molding means for extruding a molten polymer material from a mold (46) to mold a thin tube (P).
(4), a hollow tube (44) communicating with the inside of the extrusion molding means (4) from the mold (46) side to the anti-mold side, and attached to the tip of the hollow tube (44) A membrane body (48) which is capable of passing ions, can seal the inside of the hollow tube (44) from the mold (46) side in an airtight manner, and abuts on the inner surface of the thin tube (P) having a predetermined diameter. And guide the ions from the side opposite to the die of the extrusion molding means (4) to the tip through the hollow tube (44) and irradiate the ions to the inner surface of the thin tube (P) through the membrane body (48). There is provided an apparatus (100) for manufacturing an inner surface-treated thin tube, characterized by comprising:

[0006]

In the method and the apparatus for manufacturing the inner surface treated thin tube of the present invention, the hollow tube (44) is inserted into the thin tube (P) of the polymer material, and the hollow tube (44) is passed through the hollow tube (44) to the outside of the hollow tube. The ions are guided from the above, and the inner surface of the thin tube of the portion where the thin tube (P) is formed to have a predetermined diameter is irradiated with the ions. At the tip of the hollow tube (44), a membrane body (48) that allows ions to pass therethrough and airtightly shields the inside of the hollow tube (44) from the mold (46) side is attached. Four
4) Maintain the vacuum inside.

Inside the thin tube, a hollow tube for guiding ions (44)
Since only the thin tube (P) is inserted, the inner surface of the thin tube (P) having a small inner diameter can be preferably treated. In addition, the hollow tube (4
Since the inside of 4) is isolated from the outside, it is easy to evacuate and maintain the inside of the hollow tube 44, and it is possible to prevent neutralization of ions by residual gas and generation of unwanted ions.

[0008]

The present invention will be described in more detail with reference to the embodiments shown in the drawings. The present invention is not limited to this.

FIG. 1 is a schematic configuration diagram showing an inner surface processing thin tube manufacturing apparatus according to an embodiment of the present invention. In this manufacturing apparatus 100 for an inner surface processing thin tube, 1 is an ion source, 2 is a mass spectrometric system for aligning the ion species and the number of charges of the ion beam, and 3 is a focusing / scanning system for irradiating / scanning the ion beam in a fine bundle. . 4 has a mold at the tip,
It is an extruder for extruding the thin tube P. 5 is a take-back machine. If the film is not formed with high quality, the mass spectrometry system 2 and / or the focusing / scanning system 3 may be omitted.

The material of the thin tube P is, for example, a polymer such as silicone rubber, polyurethane and silicone block polymer, polytetrafluoroethylene, polyvinyl chloride, polyethylene terephthalate, segmented polyurethane, polyethylene or polypropylene. The inner diameter of the thin tube P can be processed even if it is, for example, about 5 mm. Applications of capillaries are in the medical and food processing industries.

FIG. 2 is an enlarged view of the cross section of the extrusion molding machine 4. The cylinder 41 has a heater 42 on its outer periphery.
And a hopper 43. In addition, a hollow screw 44 is provided inside. Further, a mold 46 provided with a water jacket 47 is provided at one end. The hollow screw 44 is rotated by a motor 45.

At the tip of the hollow screw 44, ions I
It is provided with a film body 48 which allows air to pass therethrough and airtightly shields the inside of the hollow screw 44. The film body 48 is, for example, a light metal foil such as aluminum, and is attached to the tip of the hollow screw 44 by brazing or welding. Reference numeral 49 is a protruding rod that applies tension to the film body 48 and forms the inner surface of the thin tube P, and is attached to the hollow screw 44 by a pin 50.

The other end of the hollow screw 44 is connected to the focusing / scanning system 3, the mass spectrometric system 2 and the ion source 1, and the internal space of the hollow screw 44 is focused from the other end side of the hollow screw 44 to the focusing unit.・ Scanning system 3,
It is in air-tight communication with the mass spectrometry system 2 and the ion source 1. This communication space is evacuated by a vacuum exhaust device (not shown). Since the inner space of the hollow screw 44 is airtightly shielded from the mold 46 side by the film body 48, the communication space can be easily evacuated to vacuum. Further, since the vacuum is surely maintained, it is possible to prevent the neutralization of the ions due to the residual gas and the generation of unnecessary ions, thereby improving the efficiency of ion irradiation.

Next, the operation will be described. First, the heater 42
The cylinder 41 is heated in advance, and the raw material P ′ is charged from the hopper 43. Next, the motor 45 drives the hollow screw 44.
Is rotated to transport the melted raw material P ′ toward the mold 46. Then, the melted raw material P ′ is extruded from the gap between the mold 46 and the protruding rod 49 while being cooled by the mold 46, and becomes the thin tube P. In this state, the ion beam IB is guided from the ion source 1, and the ion I is applied to the inner surface of the thin tube P through the film body 48. As the ions, inert gas ions such as argon, active gas ions such as oxygen, and molecular ions such as nitrogen gas can be used. It is preferable that the focusing / scanning system 3 electromagnetically shakes the ion beam IB to uniformly scan the surface of the film body 48.

According to the above-described apparatus 100 for manufacturing the inner surface-treated thin tube, it is possible to continuously manufacture the thin tube P having a small diameter while performing the inner surface treatment. Further, since the inner space of the hollow screw 44 can be made into a high vacuum by the film body 48, ions can be efficiently injected. Further, since the surface is modified by ion implantation, various kinds of high-performance and multifunctional inner surfaces and their surface layers can be obtained at high speed. Further, it can be manufactured in a clean environment, which is preferable in terms of hygiene.

[0016]

According to the method and apparatus for manufacturing an inner surface-treated thin tube of the present invention, since the ion source is provided outside the thin tube, the inner surface can be favorably processed even with a thin tube having a small inner diameter.
Moreover, since the ion passage is hermetically blocked by using the film body and the high vacuum is maintained, the ions can be efficiently injected. Furthermore, the inner surface treatment of the thin tube is performed while molding the polymer material into the thin tube, so that the inner surface-treated thin tube can be manufactured continuously and efficiently.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an apparatus for manufacturing an inner surface-treated thin tube according to an embodiment of the present invention.

FIG. 2 is an explanatory view in which a cross section of the extrusion molding machine in FIG. 1 is enlarged.

[Explanation of symbols]

 100 Inner surface treatment thin tube manufacturing apparatus 1 Ion source 2 Mass spectrometric system 3 Focusing / scanning system 4 Extruder 5 Take-up machine P narrow tube 41 Cylinder 42 Heater 43 Hopper 44 Hollow screw 46 Mold 47 Water jacket 48 Membrane 49 Projecting rod 50 pin

Claims (2)

[Claims] 1. A hollow tube provided with a membrane at the tip of the hollow tube, which allows ions to pass therethrough and hermetically shuts off the inside of the hollow tube, is inserted into a thin tube of a polymeric material, and the thin tube has a predetermined diameter. The tip of the hollow tube is brought into contact with the inner surface of the thin tube of the portion to be formed, and the inside of the hollow tube is evacuated to guide ions from the outside of the hollow tube to the inside of the hollow tube to the tip of the hollow tube through the membrane. A method for producing an inner surface-treated thin tube, which comprises irradiating the inner surface of the thin tube with the ions. 2. An extruding means for extruding a molten polymer material from a die to form a thin tube, and a hollow tube communicating with the inside of the extruding means from the die side to the opposite die side, and A film body attached to the tip of the hollow tube, capable of allowing ions to pass therethrough, airtightly blocking the inside of the hollow tube from the mold side, and abutting against the inner surface of the thin tube of the portion forming the thin tube to a predetermined diameter; An apparatus for manufacturing an inner surface-treated thin tube, comprising: an ion irradiation unit that guides ions from an anti-mold side through the hollow tube to the tip portion and irradiates the inner surface of the thin tube with the ions through the film body.