JP2000013080A - Electromagnetic wave blocking pipe and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic wave blocking pipe which can has a durability to cutting, wear, etc., can remarkably improve its life and can be thermally shrunk with an electromagnetic wave shielding effect. SOLUTION: A plastic pipe 20 thermally shrinkable to a predetermined diameter corresponding to a size of an electric wire cable such as a signal cable requiring electromagnetic wave shielding is inserted into a net-like sleeve 30 as a net tube woven by a zinc-plated copper wire as warp and weft strings to cover the outer peripheral surface of the plastic pipe 20 with the net-like sleeve 30, the sleeve 30 is fixedly bonded with an adhesive to the outer peripheral surface of the plastic pipe 20, thus forming an electromagnetic wave blocking pipe 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-shrinkable electromagnetic wave prevention tube for shielding electromagnetic waves arriving at electric wires such as power cables and signal cables, and a method of manufacturing the same.

[0002]

2. Description of the Related Art A conventional heat-shrinkable electromagnetic wave prevention tube is formed of a hollow plastic tube which can be heat-shrinked when heated so that a power line, a signal line, and other electric wires can be housed integrally and can be properly housed inside. It is configured.

[0003]

However, the conventional electromagnetic wave prevention tube as described above is made of a plastic material having a relatively small thickness. It tends to be uneven. As a result, there is a problem that the electromagnetic wave prevention tube is easily damaged by friction or abrasion during actual use. The present invention has been made in order to solve the above problems, has durability against abrasion and the like, can greatly improve the life, and has a heat-shrinkable electromagnetic wave prevention tube having an electromagnetic wave shielding effect. It is an object of the present invention to provide a manufacturing method thereof.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an electromagnetic wave prevention tube for shielding electromagnetic waves arriving at an electric wire, wherein a net-like tube is formed by using a thin copper wire as a warp and a weft. Has a net-like sleeve that can be extended and contracted in the length direction and the radial direction, and a heat-shrinkable plastic pipe having a predetermined diameter. Is covered with a net-like sleeve, and this net-like sleeve is fixed to a plastic pipe with an adhesive. The present invention is also an electromagnetic wave prevention tube for shielding electromagnetic waves arriving at an electric wire, which is woven so that a thin copper wire is formed into a net-like tube as a warp and a weft, so that it can expand and contract in the length direction and the radial direction. It has a possible net-like sleeve and a heat-shrinkable plastic pipe of a predetermined diameter, and inserts the net-like sleeve into the plastic pipe while expanding it to a diameter corresponding to the inner diameter of the plastic pipe, and bonding this net-like sleeve. It is characterized by being fixed to a plastic tube by an agent.

[0005] In order to achieve the above object, the present invention relates to a method of manufacturing an electromagnetic wave prevention tube for shielding electromagnetic waves arriving at an electric wire, which is woven using a thin copper wire as a warp and a weft so as to form a net-like tube. Thereby, a net-like sleeve element which can be expanded and contracted in the length direction and the radial direction, and a heat-shrinkable plastic pipe having a predetermined diameter are provided. A first step of inserting a diameter jig to expand the net-shaped sleeve body to form a hollow net-shaped sleeve, and then extracting the rod-shaped enlarged jig; Second straightening of the plastic tube by inserting a straight rod member with a slightly smaller diameter
And after inserting the plastic tube with the rod member inserted therein into the expanded hollow net-shaped sleeve, the diameter of the hollow net-shaped sleeve is reduced by pulling both ends of the hollow net-shaped sleeve. A third step of applying an adhesive to the outer surface of the plastic tube covered with the hollow net-shaped sleeve, and a step of drying the applied adhesive. A fifth step of fixing the net-shaped sleeve to the outer surface of the plastic tube by removing the rod member.

The present invention also relates to a method of manufacturing an electromagnetic wave preventing tube for shielding electromagnetic waves arriving at an electric wire, the method comprising weaving a thin copper wire as a warp and a weft so as to form a net-like tube, thereby reducing the length of the tube. And a net-like sleeve element that can be expanded and contracted in the radial direction, and a heat-shrinkable plastic pipe having a predetermined diameter, and a rod-shaped expanding jig having a diameter smaller than the inner diameter of the plastic pipe in the net-shaped sleeve element. A first step of inserting and expanding the diameter of the net-shaped sleeve body to form a hollow net-shaped sleeve; and applying an adhesive to the outer peripheral surface of a rod-shaped adhesive application jig having a diameter smaller than the inner diameter of the plastic pipe. A second step of inserting the rod-shaped adhesive application jig into the plastic pipe and uniformly applying the adhesive to the inner peripheral surface of the plastic pipe; and A third step of inserting the hollow net-shaped sleeve into the plastic pipe by inserting the hollow net-shaped sleeve into the plastic pipe coated with the adhesive while the rod-shaped expanding jig is still inserted; After inserting the cylindrical pipe having a predetermined diameter into the hollow net-shaped sleeve after pulling out the diameter-enlargement jig, the plastic pipe including the cylindrical pipe is rolled while being pressed on a flat surface so as to be rolled. A fourth step of bringing the net-like sleeve into close contact with the inner peripheral surface of the plastic tube, and a fifth step of drying the adhesive and fixing the net-shaped sleeve to the inner peripheral surface of the plastic tube. And a step.

In the electromagnetic wave prevention tube and the method of manufacturing the same according to the present invention, the outer circumferential surface or the inner circumferential surface of a heat-shrinkable plastic tube having a predetermined diameter corresponding to the thickness of an electric wire such as a signal cable which needs to be shielded from electromagnetic waves is removed. Wear is made by weaving a thin copper wire as a warp and a weft so as to form a net-like tube, which is covered and integrated with a net-like sleeve that can expand and contract in the length and radial directions. In addition, it is possible to obtain a heat-shrinkable electromagnetic wave prevention tube having durability against abrasion, greatly improving the service life, and having an electromagnetic wave shielding effect.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a net-shaped sleeve element used for the electromagnetic wave prevention tube of the present invention, and FIG. 2 is a perspective view of a net-shaped sleeve obtained by expanding the diameter of the net-shaped sleeve element to form a cylindrical net-shaped sleeve. FIG. 3 is a perspective view of the electromagnetic wave prevention tube according to the first embodiment in the case where the electromagnetic wave prevention tube is formed by covering the outer peripheral surface of a heat-shrinkable plastic tube with a cylindrical net-shaped sleeve. FIG. 4 is an enlarged view of a portion A in FIG. Also,
FIG. 5 is a perspective view of an electromagnetic wave preventing tube according to a second embodiment in which the inner circumferential surface of a heat-shrinkable plastic tube is covered with a cylindrical net-like sleeve to constitute the electromagnetic wave preventing tube.

Hereinafter, an embodiment of an electromagnetic wave prevention tube of the present invention will be described with reference to these drawings, and at the same time, an embodiment of a method of manufacturing an electromagnetic wave prevention tube of the present invention will be described. As shown in FIGS. 3 and 4, the electromagnetic wave prevention tube 10 according to the first embodiment of the present invention is made of a heat-shrinkable plastic having a predetermined diameter according to the thickness of an electric wire such as a signal cable that needs to shield electromagnetic waves. The tube 20 is inserted into a net-like sleeve 30 formed by woven into a cylindrical shape with a galvanized copper wire, and the outer peripheral surface of the plastic tube 20 is covered with the net-like sleeve 30. Is fixed to the plastic tube 20 with an adhesive.

An electric wire, such as a signal cable, which needs to be shielded from electromagnetic waves, is inserted through the electromagnetic wave prevention tube 10 constructed as described above.
The electromagnetic wave prevention tube 10 is heated at a predetermined temperature and thermally contracted, so that the electromagnetic wave prevention tube 10 is brought into close contact with the outer peripheral surface of an electric wire such as a signal cable, and the outer periphery of the electric wire such as a signal cable is covered with the electromagnetic wave prevention tube 10. . This makes it possible to shield electromagnetic waves arriving at electric wires such as signal cables. The shrinkage range after heating of the electromagnetic wave prevention tube 10 at this time is as follows.
30% to 50%.

Next, a method of manufacturing the electromagnetic wave prevention tube 10 will be described with reference to FIGS. First, a heat-shrinkable hollow plastic tube 20 made of a thermoplastic resin material of 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, etc., corresponding to the thickness of an electric wire such as a signal cable requiring electromagnetic wave shielding is prepared. In addition, as shown in FIG.
A thin copper wire 41 coated with zinc, such as 6 mm, 0.18 mm, 0.20 mm, 0.22 mm, 0.23 mm, etc., is woven as a warp and a weft so as to form a net-like tube, so that the length direction and Net-like sleeve body 40 that can be expanded and contracted in the radial direction
Prepare

Next, a rod-shaped expanding jig (not shown) having a diameter larger than that of the plastic tube 20 is inserted into the net-shaped sleeve body 40, and the net-shaped sleeve body 4 is formed.
The diameter of 0 is expanded, and a cylindrical hollow net-shaped sleeve 30 shown in FIG. 2 is formed (first step). After the hollow net-shaped sleeve 30 is formed, the rod-shaped enlarged diameter jig is removed from the hollow net-shaped sleeve 30. Next, a linear rod member (not shown) having a slightly smaller diameter than the plastic tube 20 is inserted into the plastic tube 20, and the plastic tube 20 is straightened into a tube (second step).

Next, after the plastic tube 20 with the rod member inserted therein is inserted into the hollow net-shaped sleeve 40, the both ends of the hollow net-shaped sleeve 40 are pulled to thereby form the hollow net-shaped sleeve. The diameter of the sleeve 40 is reduced so that the sleeve 40 comes into close contact with the outer peripheral surface of the plastic tube 20 (third step). Next, the hollow net-shaped sleeve 40
An adhesive is applied to the outer surface of the plastic tube 20 covered with (4). After that, the applied adhesive is dried and the net-shaped sleeve 40 is attached to the plastic tube 2.
0, and the rod member is removed (No. 5).
Process). Thereby, the electromagnetic wave prevention tube 10 shown in FIG. 3 in which the outer surface of the plastic tube 20 is covered with the metal net-shaped sleeve 40 is formed.

According to the first embodiment of the present invention, the electromagnetic wave prevention tube 10 is composed of the plastic tube 20 and the metal net-shaped sleeve 40 which is coated on the outer surface of the plastic tube 20 in close contact. With this configuration, the electromagnetic wave prevention tube 10 after the heat shrinkage has good electric characteristics with respect to the shielding of the electromagnetic wave of the electric wire, and the electromagnetic wave prevention tube 10 has a good appearance and has durability against abrasion and abrasion. The service life can be extended. In addition, the electromagnetic wave prevention tube 10 according to the first embodiment includes a FCC (US Federal Communications Commission), CE (European Communications Commission), VCCI
(Council for Arbitrary Control of Radio Interference), CNS (China National Standard)
And the like, and can effectively protect electric wires such as signal cables from electromagnetic waves.

Next, an electromagnetic wave prevention tube according to a second embodiment of the present invention will be described with reference to FIG. The electromagnetic wave prevention tube 50 according to the second embodiment is a heat-shrinkable plastic tube 20 having a predetermined diameter in accordance with the thickness of an electric wire such as a signal cable which needs to shield electromagnetic waves. A metal net-shaped sleeve 30 formed by weaving into a cylindrical shape is inserted in a close contact state, and the net-shaped sleeve 30 is fixed to the inner peripheral surface of the plastic tube 20 with an adhesive.

An electric wire such as a signal cable which needs to be shielded from electromagnetic waves is inserted through the electromagnetic wave prevention tube 50 thus constructed,
The electromagnetic wave prevention tube 50 is heated at a predetermined temperature and thermally contracted, so that the electromagnetic wave prevention tube 50 is brought into close contact with the outer peripheral surface of an electric wire such as a signal cable, and the outer periphery of the electric wire such as a signal cable is covered with the electromagnetic wave prevention tube 50. . This makes it possible to shield electromagnetic waves arriving at electric wires such as signal cables. The shrinkage range after heating of the electromagnetic wave prevention tube 50 at this time is
30% to 50%.

Next, a method of manufacturing the electromagnetic wave prevention tube 50 will be described with reference to FIGS. First, as in the case of the first embodiment, a thermoplastic resin material of 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm or the like corresponding to the thickness of an electric wire such as a signal cable requiring shielding of electromagnetic waves. Heat-shrinkable hollow plastic tube 2
0, and further, as shown in FIG.
A thin copper wire 41 coated with zinc, such as 6 mm, 0.18 mm, 0.20 mm, 0.22 mm, 0.23 mm, etc., is woven as a warp and a weft so as to form a net-like tube, so that the length direction and Net-like sleeve body 40 that can be expanded and contracted in the radial direction
Prepare

Next, a rod-shaped expanding jig (not shown) having a diameter smaller than the inner diameter of the plastic tube 20 is inserted into the net-shaped sleeve body 40 to expand the diameter of the net-shaped sleeve body 30. And a cylindrical hollow hollow sleeve 30
(First step). Next, an adhesive is applied to the outer peripheral surface of a rod-shaped adhesive application jig (not shown) having a diameter smaller than the inner diameter of the plastic tube 20, and the rod-shaped adhesive application jig is placed in the plastic tube 20. Then, the adhesive is uniformly applied to the inner peripheral surface of the plastic tube 20 (second step).

Thereafter, the hollow net-shaped sleeve 30 having the diameter increased is inserted into the plastic tube 20 coated with the adhesive while the rod-shaped diameter expanding jig is still inserted, and the hollow net-shaped sleeve 30 is inserted. 30 is temporarily attached to the inner surface of the plastic tube 20 (third step). Next, the hollow net-shaped sleeve 30 after the rod-shaped expanding jig is pulled out.
A cylindrical tube (not shown) having a predetermined diameter is inserted into the inside, and the plastic tube 20 including the cylindrical tube is rolled while being pressed on a flat surface such as a table, thereby forming the net-shaped sleeve 3.
0 is brought into close contact with the inner peripheral surface of the plastic tube 20 (fourth step). Then, after pulling out the cylindrical tube, the adhesive is dried to fix the net-shaped sleeve 30 to the inner peripheral surface of the plastic tube 20 (fifth step). Thereby, the electromagnetic wave prevention tube 50 shown in FIG. 5 in which the inner peripheral surface of the plastic tube 20 is covered with the metal net-shaped sleeve 40 is formed.

According to the second embodiment of the present invention, the electromagnetic wave prevention tube 50 is composed of the plastic tube 20 and the metal net-shaped sleeve 40 which is coated on the inner peripheral surface of the plastic tube 20 in close contact. Therefore, the electromagnetic wave prevention tube 50 after the heat shrinkage has good electric characteristics with respect to the electromagnetic wave shielding of the electric wire, and the electromagnetic wave prevention tube 50 has a good appearance, durability against abrasion and abrasion, 10 can be extended. Also, in the electromagnetic wave prevention tube 50 according to the second embodiment, the FCC (US Federal Communications Commission), CE (European Communications Commission), VCCI
(Council for Arbitrary Control of Radio Interference), CNS (China National Standard)
And the like, and can effectively protect electric wires such as signal cables from electromagnetic waves.

[0021]

As described above, according to the electromagnetic wave prevention tube and the method of manufacturing the same of the present invention, the outer periphery of a heat-shrinkable plastic tube having a predetermined diameter corresponding to the thickness of an electric wire such as a signal cable which needs to shield electromagnetic waves. The surface or inner peripheral surface is covered and integrated with a net-like sleeve that can be stretched in the length and radial directions by weaving a thin copper wire as a warp and weft to form a net-like tube. With this structure, it is possible to obtain a heat-shrinkable electromagnetic wave prevention tube having durability against abrasion and abrasion, greatly improving the service life, and having an electromagnetic wave shielding effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a metallic net-shaped sleeve element applied to an electromagnetic wave prevention tube of the present invention.

FIG. 2 is a perspective view showing an example in which a metal net-like sleeve element applied to the electromagnetic wave prevention tube of the present invention is formed into a hollow net-like sleeve by expanding its diameter.

FIG. 3 is a perspective view of the electromagnetic wave prevention tube according to the first embodiment of the present invention.

FIG. 4 is an enlarged partial view of a portion A in FIG. 3;

FIG. 5 is a perspective view of an electromagnetic wave prevention tube according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electromagnetic wave prevention tube 20 Plastic tube 30 Net-like sleeve 40 Net-like sleeve body 41 Copper wire 50 Electromagnetic wave prevention tube

[Procedure amendment]

[Submission Date] July 16, 1999 (1999.7.1)
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Title of the Invention Electromagnetic Wave Prevention Tube and Manufacturing Method Thereof

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-shrinkable electromagnetic wave prevention tube for shielding electromagnetic waves arriving at electric wires such as power cables and signal cables, and a method of manufacturing the same.

[0002]

2. Description of the Related Art A conventional heat-shrinkable electromagnetic wave prevention tube is formed of a hollow plastic tube which can be heat-shrinked when heated so that a power line, a signal line, and other electric wires can be housed integrally and can be properly housed inside. It is configured.

[0003]

However, the conventional electromagnetic wave prevention tube as described above is made of a plastic material having a relatively small thickness. It tends to be uneven. As a result, there is a problem that the electromagnetic wave prevention tube is easily damaged by friction or abrasion during actual use. The present invention has been made in order to solve the above problems, has durability against abrasion and the like, can greatly improve the life, and has a heat-shrinkable electromagnetic wave prevention tube having an electromagnetic wave shielding effect. It is an object of the present invention to provide a manufacturing method thereof.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method in which a thin copper wire is woven so as to form a net-like tube as a warp and a weft so that it can be expanded and contracted in a length direction and a radial direction. A net-like sleeve element and a heat-shrinkable plastic pipe having a predetermined diameter, wherein a rod-shaped expanding jig having a diameter larger than the plastic pipe is inserted into the net-like sleeve element. After expanding the body to form a hollow net-shaped sleeve, a first step of extracting the rod-shaped expanding jig, and inserting a linear rod member slightly smaller in diameter than the plastic pipe into the plastic pipe. A second step of straightening the plastic tube with the rod member, and inserting the plastic tube with the rod member inserted into the expanded hollow net-shaped sleeve. A third step of reducing the diameter of the hollow net-shaped sleeve by pulling both ends of the net-shaped sleeve so as to come into close contact with the outer peripheral surface of the plastic pipe; and adhering to the outer surface of the plastic pipe covered with the hollow net-shaped sleeve. A fourth step of applying an agent, and a fifth step of drying the applied adhesive to fix the net-shaped sleeve to the outer surface of the plastic tube and removing the rod member. And

The present invention also relates to a method of manufacturing an electromagnetic wave prevention tube for shielding an electromagnetic wave arriving at an electric wire, the method comprising weaving a thin copper wire as a warp and a weft so as to form a net-like tube, thereby reducing the length of the tube. And a net-like sleeve element that can be expanded and contracted in the radial direction, and a heat-shrinkable plastic pipe having a predetermined diameter, and a rod-shaped expanding jig having a diameter smaller than the inner diameter of the plastic pipe in the net-shaped sleeve element. A first step of inserting and expanding the diameter of the net-shaped sleeve body to form a hollow net-shaped sleeve; and applying an adhesive to the outer peripheral surface of a rod-shaped adhesive application jig having a diameter smaller than the inner diameter of the plastic pipe. A second step of inserting the rod-shaped adhesive application jig into the plastic pipe and uniformly applying the adhesive to the inner peripheral surface of the plastic pipe; and A third step of inserting the hollow net-shaped sleeve into the plastic pipe by inserting the hollow net-shaped sleeve into the plastic pipe coated with the adhesive while the rod-shaped expanding jig is still inserted; After inserting the cylindrical pipe having a predetermined diameter into the hollow net-shaped sleeve after pulling out the diameter-enlargement jig, the plastic pipe including the cylindrical pipe is rolled while being pressed on a flat surface so as to be rolled. A fourth step of bringing the net-like sleeve into close contact with the inner peripheral surface of the plastic tube, and a fifth step of drying the adhesive and fixing the net-shaped sleeve to the inner peripheral surface of the plastic tube. And a step.

In the electromagnetic wave prevention tube and the method of manufacturing the same according to the present invention, the outer peripheral surface or the inner peripheral surface of a heat-shrinkable plastic tube having a predetermined diameter corresponding to the thickness of an electric wire such as a signal cable requiring electromagnetic wave shielding is provided. Wear is made by weaving a thin copper wire as a warp and a weft so as to form a net-like tube, which is covered and integrated with a net-like sleeve that can expand and contract in the length and radial directions. In addition, it is possible to obtain a heat-shrinkable electromagnetic wave prevention tube having durability against abrasion, greatly improving the service life, and having an electromagnetic wave shielding effect.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a net-shaped sleeve element used for the electromagnetic wave prevention tube of the present invention, and FIG. 2 is a perspective view of a net-shaped sleeve obtained by expanding the diameter of the net-shaped sleeve element to form a cylindrical net-shaped sleeve. FIG. 3 is a perspective view of the electromagnetic wave prevention tube according to the first embodiment in the case where the electromagnetic wave prevention tube is formed by covering the outer peripheral surface of a heat-shrinkable plastic tube with a cylindrical net-shaped sleeve. FIG. 4 is an enlarged view of a portion A in FIG. Also,
FIG. 5 is a perspective view of an electromagnetic wave preventing tube according to a second embodiment in which the inner circumferential surface of a heat-shrinkable plastic tube is covered with a cylindrical net-like sleeve to constitute the electromagnetic wave preventing tube.

Hereinafter, an embodiment of an electromagnetic wave prevention tube of the present invention will be described with reference to these drawings, and at the same time, an embodiment of a method of manufacturing an electromagnetic wave prevention tube of the present invention will be described. As shown in FIGS. 3 and 4, the electromagnetic wave prevention tube 10 according to the first embodiment of the present invention is made of a heat-shrinkable plastic having a predetermined diameter according to the thickness of an electric wire such as a signal cable that needs to shield electromagnetic waves. The tube 20 is inserted into a net-like sleeve 30 formed by woven into a cylindrical shape with a galvanized copper wire, and the outer peripheral surface of the plastic tube 20 is covered with the net-like sleeve 30. Is fixed to the plastic tube 20 with an adhesive.

An electric wire such as a signal cable which needs to be shielded from electromagnetic waves is inserted into the electromagnetic wave preventing tube 10 thus constructed,
The electromagnetic wave prevention tube 10 is heated at a predetermined temperature and thermally contracted, so that the electromagnetic wave prevention tube 10 is brought into close contact with the outer peripheral surface of an electric wire such as a signal cable, and the outer periphery of the electric wire such as a signal cable is covered with the electromagnetic wave prevention tube 10. . This makes it possible to shield electromagnetic waves arriving at electric wires such as signal cables. The shrinkage range after heating of the electromagnetic wave prevention tube 10 at this time is as follows.
30% to 50%.

Next, a method of manufacturing the electromagnetic wave prevention tube 10 will be described with reference to FIGS. First, a heat-shrinkable hollow plastic tube 20 made of a thermoplastic resin material of 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, etc., corresponding to the thickness of an electric wire such as a signal cable requiring electromagnetic wave shielding is prepared. In addition, as shown in FIG.
A thin copper wire 41 coated with zinc, such as 6 mm, 0.18 mm, 0.20 mm, 0.22 mm, 0.23 mm, etc., is woven as a warp and a weft so as to form a net-like tube, so that the length direction and Net-like sleeve body 40 that can be expanded and contracted in the radial direction
Prepare

Next, a rod-shaped expanding jig (not shown) having a diameter larger than that of the plastic tube 20 is inserted into the net-shaped sleeve body 40, and the net-shaped sleeve body 4 is formed.
The diameter of 0 is expanded, and a cylindrical hollow net-shaped sleeve 30 shown in FIG. 2 is formed (first step). After the hollow net-shaped sleeve 30 is formed, the rod-shaped enlarged diameter jig is removed from the hollow net-shaped sleeve 30. Next, a linear rod member (not shown) having a slightly smaller diameter than the plastic tube 20 is inserted into the plastic tube 20, and the plastic tube 20 is straightened into a tube (second step).

Next, after inserting the plastic tube 20 with the rod member inserted therein into the expanded hollow net-shaped sleeve 40, both ends of the hollow net-shaped sleeve 40 are pulled to thereby form the hollow net-shaped sleeve 40. The diameter of the sleeve 40 is reduced so that the sleeve 40 comes into close contact with the outer peripheral surface of the plastic tube 20 (third step). Next, the hollow net-shaped sleeve 40
An adhesive is applied to the outer surface of the plastic tube 20 covered with (4). After that, the applied adhesive is dried and the net-shaped sleeve 40 is attached to the plastic tube 2.
0, and the rod member is removed (No. 5).
Process). Thereby, the electromagnetic wave prevention tube 10 shown in FIG. 3 in which the outer surface of the plastic tube 20 is covered with the metal net-shaped sleeve 40 is formed.

According to the first embodiment of the present invention, the electromagnetic wave prevention tube 10 is composed of the plastic tube 20 and the metal net-shaped sleeve 40 which is coated on the outer surface of the plastic tube 20 in close contact. With this configuration, the electromagnetic wave prevention tube 10 after the heat shrinkage has good electric characteristics with respect to the shielding of the electromagnetic wave of the electric wire, and the electromagnetic wave prevention tube 10 has a good appearance and has durability against abrasion and abrasion. The service life can be extended. In addition, the electromagnetic wave prevention tube 10 according to the first embodiment includes a FCC (US Federal Communications Commission), CE (European Communications Commission), VCCI
(Council for Arbitrary Control of Radio Interference), CNS (China National Standard)
And the like, and can effectively protect electric wires such as signal cables from electromagnetic waves.

Next, an electromagnetic wave prevention tube according to a second embodiment of the present invention will be described with reference to FIG. The electromagnetic wave prevention tube 50 according to the second embodiment is a heat-shrinkable plastic tube 20 having a predetermined diameter in accordance with the thickness of an electric wire such as a signal cable which needs to shield electromagnetic waves. A metal net-shaped sleeve 30 formed by weaving into a cylindrical shape is inserted in a close contact state, and the net-shaped sleeve 30 is fixed to the inner peripheral surface of the plastic tube 20 with an adhesive.

An electric wire such as a signal cable which needs to be shielded from electromagnetic waves is inserted into the electromagnetic wave prevention tube 50 thus constructed,
The electromagnetic wave prevention tube 50 is heated at a predetermined temperature and thermally contracted, so that the electromagnetic wave prevention tube 50 is brought into close contact with the outer peripheral surface of an electric wire such as a signal cable, and the outer periphery of the electric wire such as a signal cable is covered with the electromagnetic wave prevention tube 50. . This makes it possible to shield electromagnetic waves arriving at electric wires such as signal cables. The shrinkage range after heating of the electromagnetic wave prevention tube 50 at this time is
30% to 50%.

Next, a method of manufacturing the electromagnetic wave prevention tube 50 will be described with reference to FIGS. First, as in the case of the first embodiment, a thermoplastic resin material of 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm or the like corresponding to the thickness of an electric wire such as a signal cable requiring shielding of electromagnetic waves. Heat-shrinkable hollow plastic tube 2
0, and further, as shown in FIG.
A thin copper wire 41 coated with zinc, such as 6 mm, 0.18 mm, 0.20 mm, 0.22 mm, 0.23 mm, etc., is woven as a warp and a weft so as to form a net-like tube, so that the length direction and Net-like sleeve body 40 that can be expanded and contracted in the radial direction
Prepare

Next, a rod-shaped expanding jig (not shown) having a diameter smaller than the inner diameter of the plastic tube 20 is inserted into the net-shaped sleeve body 40, and the net-shaped sleeve body 30 is expanded in diameter. And a cylindrical hollow hollow sleeve 30
(First step). Next, an adhesive is applied to the outer peripheral surface of a rod-shaped adhesive application jig (not shown) having a diameter smaller than the inner diameter of the plastic tube 20, and the rod-shaped adhesive application jig is placed in the plastic tube 20. Then, the adhesive is uniformly applied to the inner peripheral surface of the plastic tube 20 (second step).

Thereafter, the hollow net-shaped sleeve 30 having the diameter increased is inserted into the plastic tube 20 coated with the adhesive while the rod-shaped diameter expansion jig is still inserted, and the hollow net-shaped sleeve 30 is inserted. 30 is temporarily attached to the inner surface of the plastic tube 20 (third step). Next, the hollow net-shaped sleeve 30 after the rod-shaped expanding jig is pulled out.
A cylindrical tube (not shown) having a predetermined diameter is inserted into the inside, and the plastic tube 20 including the cylindrical tube is rolled while being pressed on a flat surface such as a table, thereby forming the net-shaped sleeve 3.
0 is brought into close contact with the inner peripheral surface of the plastic tube 20 (fourth step). Then, after pulling out the cylindrical tube, the adhesive is dried to fix the net-shaped sleeve 30 to the inner peripheral surface of the plastic tube 20 (fifth step). Thereby, the electromagnetic wave prevention tube 50 shown in FIG. 5 in which the inner peripheral surface of the plastic tube 20 is covered with the metal net-shaped sleeve 40 is formed.

According to the second embodiment of the present invention, the electromagnetic wave preventing tube 50 is composed of the plastic tube 20 and the metallic net-shaped sleeve 40 which is coated on the inner peripheral surface of the plastic tube 20 in close contact. Therefore, the electromagnetic wave prevention tube 50 after the heat shrinkage has good electric characteristics with respect to the electromagnetic wave shielding of the electric wire, and the electromagnetic wave prevention tube 50 has a good appearance, durability against abrasion and abrasion, 10 can be extended. Also, in the electromagnetic wave prevention tube 50 according to the second embodiment, the FCC (US Federal Communications Commission), CE (European Communications Commission), VCCI
(Council for Arbitrary Control of Radio Interference), CNS (China National Standard)
And the like, and can effectively protect electric wires such as signal cables from electromagnetic waves.

[0020]

As described above, according to the electromagnetic wave prevention tube and the method of manufacturing the same of the present invention, the outer periphery of a heat-shrinkable plastic tube having a predetermined diameter corresponding to the thickness of an electric wire such as a signal cable which needs to shield electromagnetic waves. The surface or inner peripheral surface is covered and integrated with a net-like sleeve that can be stretched in the length and radial directions by weaving a thin copper wire as a warp and weft to form a net-like tube. With this structure, it is possible to obtain a heat-shrinkable electromagnetic wave prevention tube having durability against abrasion and abrasion, greatly improving the service life, and having an electromagnetic wave shielding effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a metallic net-shaped sleeve element applied to an electromagnetic wave prevention tube of the present invention.

FIG. 2 is a perspective view showing an example in which a metal net-like sleeve element applied to the electromagnetic wave prevention tube of the present invention is formed into a hollow net-like sleeve by expanding its diameter.

FIG. 3 is a perspective view of the electromagnetic wave prevention tube according to the first embodiment of the present invention.

FIG. 4 is an enlarged partial view of a portion A in FIG. 3;

FIG. 5 is a perspective view of an electromagnetic wave prevention tube according to a second embodiment of the present invention.

[Description of Signs] 10 Electromagnetic wave prevention tube 20 Plastic tube 30 Net-like sleeve 40 Net-like sleeve body 41 Copper wire 50 Electromagnetic wave prevention tube

Claims (4)

[Claims] 1. An electromagnetic wave prevention tube for shielding an electromagnetic wave arriving at an electric wire, wherein the tube is woven so as to form a net-like tube as a warp and a weft so that it can expand and contract in a length direction and a radial direction. A plastic sleeve having a predetermined diameter and a heat-shrinkable plastic pipe, wherein the plastic pipe is inserted into the net-shaped sleeve, and the outer peripheral surface of the plastic pipe is covered with the net-shaped sleeve. An electromagnetic wave prevention tube, characterized in that is adhered to a plastic tube with an adhesive. 2. An electromagnetic wave prevention tube for shielding an electromagnetic wave arriving at an electric wire, which can be stretched in a length direction and a radial direction by weaving a thin copper wire as a warp and a weft so as to form a mesh tube. A plastic sleeve having a predetermined diameter and a heat-shrinkable plastic pipe. The net-shaped sleeve is inserted into the plastic pipe while being enlarged to a diameter corresponding to the inner diameter of the plastic pipe. An electromagnetic wave prevention tube fixed to a plastic tube by means of 3. A method of manufacturing an electromagnetic wave prevention tube for shielding an electromagnetic wave arriving at an electric wire, comprising: weaving a thin copper wire as a warp and a weft so as to form a net-like tube; A net-shaped sleeve element that can be expanded and contracted, and a heat-shrinkable plastic pipe having a predetermined diameter, wherein a rod-shaped expanding jig having a diameter larger than the plastic pipe is inserted into the net-shaped sleeve element. First step of extracting the rod-shaped diameter-expanding jig after expanding the cylindrical sleeve body to form a hollow net-shaped sleeve; and a linear rod member having a diameter slightly smaller than the plastic pipe in the plastic pipe. A second step of straightening the plastic tube by inserting the plastic tube; and inserting the plastic tube with the rod member inserted therein into the expanded hollow net-shaped sleeve. A third step of reducing the diameter of the hollow net-shaped sleeve by pulling both ends of the hollow net-shaped sleeve and bringing the hollow net-shaped sleeve into close contact with the outer peripheral surface of the plastic pipe; and the plastic pipe covered with the net-shaped sleeve. A fourth step of applying an adhesive to the outer surface of the plastic tube; and a fifth step of drying the applied adhesive to fix the hollow net-shaped sleeve to the outer surface of the plastic tube and removing the rod member. A method for manufacturing an electromagnetic wave prevention tube, comprising: 4. A method for manufacturing an electromagnetic wave prevention tube for shielding an electromagnetic wave arriving at an electric wire, comprising: weaving a thin copper wire as a warp and a weft so as to form a net-like tube; A heat-shrinkable plastic pipe having a predetermined diameter and a heat-shrinkable plastic pipe having a predetermined diameter, wherein a rod-shaped expanding jig having a diameter smaller than the inner diameter of the plastic pipe is inserted into the net-shaped sleeve element. A first step of expanding the diameter of the net-shaped sleeve body to form a hollow net-shaped sleeve; and applying an adhesive to an outer peripheral surface of a rod-shaped adhesive application jig having a diameter smaller than the inner diameter of the plastic pipe. A second step of inserting the rod-shaped adhesive application jig into the plastic pipe and uniformly applying the adhesive to the inner peripheral surface of the plastic pipe; A third step of inserting the hollow net-shaped sleeve into the plastic pipe by inserting the jig while the jig is still inserted into the plastic pipe to which the adhesive is applied; A cylindrical tube having a predetermined diameter is inserted into the hollow net-shaped sleeve after the tool is pulled out, and the plastic tube including the cylindrical tube is rolled while being pressed on a flat surface, so that the hollow net-shaped sleeve is turned into a plastic tube. A fourth step of closely contacting the inner peripheral surface of the plastic tube; and a fifth step of drying the adhesive after the cylindrical tube is pulled out and fixing the net-shaped sleeve to the inner peripheral surface of the plastic tube. A method for manufacturing an electromagnetic wave prevention tube, comprising: