JP2010027387A - Inclusion for electric wire cable, and electric wire cable provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inclusion capable of restraining an unfavorable influence onto an environment, and capable of enhancing operation reliability of an electric wire cable. <P>SOLUTION: The inclusion 5 includes a core wire 7 with a circular cross section comprising a paper material, and a bioplastic layer 8 for coating the whole area of the core wire 7, the bioplastic layer 8 is formed of a bioplastic resin or the like containing a polymer of a polylactic acid derived from a vegetable, and moisture-proofness of the inclusion 5 is thereby enhanced remarkably. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to an electric wire / cable interposition and an electric wire / cable provided with the same.
To do.

  Generally, an electric wire / cable 100 as shown in FIG. 6 is known. In this electric wire / cable 100, a plurality of (3 in FIG. 6) insulating wire cores 103 formed by covering a conductor 101 with an insulator 102 are twisted together, and the electric wire / cable that fills the gap between the twisted wires of the insulating wire cores 103 is filled. It is known that an intervening intervention (hereinafter referred to as “interposition”) 104 is arranged, a presser winding tape 105 is wound around the outer periphery thereof, and a sheath 106 as a protective coating is provided on the outer periphery thereof.

  The conventional interposer 104 is a type that is wound so as to fill the gap between the twisted insulated wire cores, and a synthetic resin extrusion type that extrudes the molten synthetic resin and fills the gap between the twisted insulated wire cores There is.

  As the above-described type of winding, there are fiber materials such as jute, cotton yarn, paper string, and tapes and strings such as polypropylene. This type of intervention is lightweight and low cost. However, the intervention made of the fibrous material has a problem of high hygroscopicity. For this reason, the use of electric wires and cables using intervening material is limited in humid places and places where water may enter from the terminal. In addition, this type of intervention has the disadvantage that jute waste and paper waste are generated during use. In addition, the intervention made of a tape or string such as polypropylene is excellent in moisture resistance, but has a drawback that it easily burns.

  Moreover, synthetic resin, such as a vinyl chloride resin, can be mentioned as intervention of the above-mentioned synthetic resin extrusion type. This type of interposition easily adheres to the insulation (covering) of the insulation core, making it difficult to separate from the insulation core in the process of separation or disposal, and the specific gravity of the synthetic resin is large, so the entire wire / cable It has a problem of becoming heavy and a problem of affecting the flexibility of the electric wire because the solidified synthetic resin becomes hard.

As a conventional technique for solving the above-described problems of the intervention, there is known a tape-like intervention 104 in which a plastic film 108 such as polyethylene or polyester is laminated on both sides of a paper base 107 as shown in FIG. (For example, refer to Patent Document 1). The interposer 104 is a tape formed by slitting a plastic sheet 108 laminated on both sides of a narrow sheet-like paper substrate, or by laminating a plastic film 108 on both sides of a wide paper substrate. The one made into a shape is used. Therefore, as shown in FIG. 7, the paper base 107 is exposed on each side surface of each interposition 104 in the width direction.
Japanese Patent Laid-Open No. 10-255558

However, the conventional interposition 104 shown in FIG. 7 has a plurality of problems as described below.
(A) Since the plastic film 108 is laminated on the interposition 104, there is a problem that it is difficult to perform the drawing process.
(B) The interposition 104 is superior in moisture resistance compared to interpositions made of fibrous materials such as jute, cotton yarn, and paper string, but the paper base material 107 is exposed along the longitudinal direction on both side surfaces in the width direction. For this reason, problems still remain in terms of moisture resistance and the occurrence of jute waste and paper waste.
(C) Since the interposition 104 has a rectangular cross-sectional shape, the peripheral surface of the insulated wire core 103 and a portion that abuts between the interpositions 104 are corner portions and a flat portion such as a side surface portion or both surface portions. In some cases, the degree of adhesion is anisotropic. For this reason, the interposition 104 has a problem that the adhesion to the insulating core is inferior to interposition made of a linear fibrous material. For the same reason, when filling the gaps between the insulation cores using a plurality of interpositions 104, the cross-sectional shape of the bundle of the insulation cores 103 and the interpositions 104 is unlikely to be circular, affecting the final shape of the electric wire / cable. There is a problem of giving. That is, the tape-like interposition 104 has a problem that the cross section of the electric wire / cable is difficult to be circular when the gap between the insulated wire cores 103 is filled.
(D) Since the plastic film 108 made of polypropylene or the like contained in the interposition 104 is a resin derived from petroleum, there is a problem when considering the future of resources, environment, and the like.

  The present invention was devised by paying attention to the above-mentioned problems, and its purpose is to suppress environmental pollution such as paper waste, and there is no generation of dioxins when incinerated and discarded. An object of the present invention is to provide an interposer having a balance of 0 and easily finishing the cross-sectional shape of the electric wire / cable into a circular shape with high moisture resistance, and an electric wire / cable provided with this interposition. That is, an object of the present invention is to provide an interposition that can suppress adverse effects on the environment and increase the operational reliability of the electric wire / cable, and an electric wire / cable having the interposition.

  Accordingly, the first feature of the present invention is that it is an interposition, and includes a core wire having a circular cross section made of paper material and a bioplastic layer covering the entire peripheral surface of the core wire.

  As the bioplastic layer, it is preferable to use a bioplastic resin selected from a plant-derived polylactic acid polymer, polycaprolactone, and copolyester. This bioplastic resin is mainly produced from corn, sugar cane, etc., which have a high starch or sugar content, but may also be produced from wood, raw garbage, milk or the like.

  The core wire is preferably a paper wire obtained by processing paper pulp into a linear shape. The interposition formed in this way is less likely to generate paper waste during production.

  The bioplastic layer may be configured to integrally cover a plurality of bundled core wires. By bundling a plurality of core wires in this way, it becomes possible to produce an intervening of a desired diameter using a core wire having a fixed diameter, and there is no need to prepare core wires having a plurality of diameters.

  The second feature of the present invention is that each of the linear conductors is covered with an insulator, and is arranged so as to fill a gap between a plurality of insulated cores twisted together and at least a plurality of insulated cores. A wire / cable comprising at least a plurality of interpositions and a sheath provided on the outermost side of a bundle including the insulating wire core and the interpositions, wherein the interposition is a core wire having a circular cross section made of a paper material, The gist is to include a bioplastic layer covering the entire peripheral surface of the core wire. Of course, the interposition may be arranged not only to fill the gap between the insulated cores but also to surround these insulated cores.

  In the invention according to the second feature, the bioplastic layer preferably includes a plant-derived polylactic acid polymer, and the core wire is preferably a paper wire obtained by processing paper pulp into a linear shape. . The bioplastic layer may be configured to integrally cover a plurality of bundled core wires.

  ADVANTAGE OF THE INVENTION According to this invention, the bad influence to an environment can be suppressed, and the electric wire and cable provided with the intervention which raises the operation reliability of an electric wire and a cable, and this intervention are realizable.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of an interposition according to an embodiment of the present invention and electric wires / cables having the same will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view of the electric wire / cable 1 according to the first embodiment of the present invention, FIG. 2 is a perspective view showing a plurality of interpositions 5, and FIG. 3 shows a state in which a plurality of insulated wire cores 9 are twisted. FIG. 4 is a perspective view showing a state in which the interposition 9 is attached to a plurality of twisted insulated wire cores 9.

  As shown in FIG. 1, the electric wire / cable 1 includes three insulated wire cores 4 twisted together and a plurality of interpositions 5 that fill gaps 9 (see FIGS. 3 and 4) between the insulated wire cores 4. The presser wound tape 10 is wound around the outer periphery of the bundle of the insulating wire core 4 with the intervening 5 and the tubular sheath 6 covering the outer peripheral surface of the presser wound tape 10.

  As shown in FIGS. 1, 3, and 4, the insulating core 4 is formed by covering a conductor 2 made of, for example, a copper wire with an insulator 3 made of an electrically insulating resin such as polyethylene.

  The interposition 5 includes a core wire 7 having a circular cross section made of a paper material and a bioplastic layer 8 covering the entire circumferential surface of the core wire 7. The intervening 5 may have a diameter of about 1 to 7 mm, for example, depending on the number and the diameter of the insulating core 4. Specifically, when, for example, three insulated wire cores 4 having a diameter of 2.6 mm are twisted, the diameter 5 of the interposition 5 may be attached to the gap 9 with about 12 to 15 interpositions 5 having a diameter of 1.3 mm. it can.

  The core wire 7 may be any one obtained by processing a paper material into a circular cross section, but is preferably a paper wire formed by processing paper pulp into a linear shape with a circular cross section from the beginning.

  The bioplastic layer 8 is preferably made of a bioplastic resin containing a plant-derived polylactic acid polymer or the like. The bioplastic resin is a polymer resin whose main raw material is produced from plants and organisms. This bioplastic resin is mainly produced from corn, sugar cane, etc., which have a high starch or sugar content, but may also be produced from wood, raw garbage, milk or the like. Among the bioplastic resins, those derived from plants include polylactic acid produced from lactic acid such as corn, polycaprolactone, and copolyester.

  Polycaprolactone is one of aliphatic polyesters and is a semi-rigid crystalline plastic similar to polypropylene. Examples of microorganism-derived materials include poly (3-hydroxybutyrate) and poly (3-hydroxybutyrate-co-hydroxyvalerate). Examples of other organisms include chitosan. Among these resins, polylactic acid or a composite of polylactic acid and other resins is preferable from the viewpoint of practical performance such as heat resistance, mechanical properties, transparency, productivity such as resin polymerization, and cost. .

  Many bioplastic resins have properties as biodegradable plastics. Such a bioplastic resin can be used in the same manner as a normal plastic when used as a coating for the interposition 5, and can be decomposed by microorganisms in the natural world when discarded after use. It has the property of not adversely affecting the environment.

  The presser wound tape 10 may be a well-known resin tape or a bioplastic resin. The sheath 6 may be made of a known protective material made of resin, for example, an insulating protective material that does not contain a halogen element based on an olefin polymer.

  Since the above-described interposition 5 has the core wire 7 having a circular cross section covered with the bioplastic layer 8, it is difficult to generate paper scraps when the terminal treatment of the electric wire / cable 1 is performed, and the environment can be prevented from being polluted.

  Since the intervening 5 is covered with the bioplastic layer 8, the intervening made of a fibrous material such as a conventional jute, cotton thread, paper string, etc., or a conventional intervening in which a plastic film is laminated on both sides of a paper tape. Therefore, the moisture resistance is greatly improved.

  Since the interposition 5 has a circular cross-sectional shape, there is no anisotropy in the degree of adhesion when contacting the peripheral surface of the insulating core 4 or the interpositions 5. For this reason, when the gap between the insulated wire cores 4 is filled using a plurality of interpositions 5, the cross-sectional shape of the bundle of the insulated wire cores 4 and the interpositions 5 is easily rounded, and the cross section of the electric wire / cable 1 is rounded. Easy to process.

  Since the bioplastic layer 8 of the interposition 5 is not a resin derived from petroleum, there is no generation of dioxins when incinerated and discarded. Bioplastic resin is a material that uses substances generated by organisms such as plants that fix carbon dioxide (CO2) in the atmosphere. It has a so-called carbon neutral property that does not affect the increase and decrease, and has the effect of not adversely affecting the environment.

Therefore, the electric wire / cable 1 provided with such an interposition 5 also has the above effect. In particular, in the electric wire / cable 1 according to the present embodiment, paper waste is not generated, and moisture resistance is greatly improved. Therefore, adverse effects on the environment can be suppressed, and operational reliability is improved.
(Second Embodiment)
Next, the intervention according to the second embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a cross section of the interposition 5A.

As shown in FIG. 5, the interposition 5 </ b> A according to the present embodiment has a structure in which two core wires 7 are arranged in parallel and these core wires 7 are integrally covered with a bioplastic layer 8. In the present embodiment, the diameter of the interposition 5A can be increased by bundling the two core wires 7 together. For this reason, since the thick interposition 5A can be produced by bundling the thin core wires 7, there is no need to increase the types of the core wires 7, and the manufacturing cost can be reduced. In the present embodiment, the two core wires 7 are bundled. However, when a plurality of core wires 7 need to be bundled, it is preferable to bundle three or more wires so that the cross section has a nearly circular shape.
(Other embodiments)
Although the first and second embodiments have been described above, it should not be understood that the description and the drawings, which form part of the disclosure of this example, limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the first embodiment described above, the present invention is applied when the number of the insulated wire cores 4 is three. However, the present invention can also be applied when the number of the insulated wire cores 4 is two or four or more. Not too long.

  In the first embodiment, the bioplastic layer 8 is formed of a bioplastic resin. However, for example, kenaf fibers may be added to the bioplastic resin to enhance heat resistance and mechanical strength. is there.

It is sectional drawing of the electric wire and cable which concern on the 1st Embodiment of this invention. It is a perspective view which shows the intervention which concerns on 1st Embodiment. It is a perspective view which shows the state which twisted the insulated wire core of the electric wire and cable which concerns on 1st Embodiment. In the electric wire and cable which concerns on 1st Embodiment, it is a perspective view which shows the state which added the intervention to the several insulated wire core twisted. It is sectional drawing of the intervention which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the conventional electric wire and cable. It is a perspective view which shows the conventional intervention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric wire and cable 2 ... Conductor 3 ... Insulator 4 ... Insulation core 5, 5A ... Interposition 6 ... Sheath 7 ... Core wire 8 ... Bioplastic layer 9 ... Crevice 10 ... Holding tape

Claims (5)

A core wire having a circular cross section made of paper material;
A bioplastic layer covering the entire circumference of the core wire;
Electric wire / cable interposition characterized by including.   The wire / cable interposition according to claim 1, wherein the bioplastic layer is selected from a plant-derived polylactic acid polymer, polycaprolactone, and copolyester.   The electric wire / cable interposition according to claim 1 or 2, wherein the core wire is a paper wire obtained by processing paper pulp into a linear shape.   The said bioplastic layer covers the bundled said core wire integrally, The intervention for electric wires and cables as described in any one of Claim 1 thru | or 3 characterized by the above-mentioned. Each wire conductor is covered with an insulator, and a plurality of insulated wire cores twisted together and at least a plurality of wires / cables interposed so as to fill a gap between the plurality of insulated wire cores And a sheath provided on the outermost side of a bundle including the insulated wire core and the electric wire / cable interposition,
The said electric wire and cable intervention is an electric wire and cable intervention as described in any one of Claim 1 thru | or 4.

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