JP2019061897A - Manufacturing method of wire, and wire - Google Patents

Abstract

To provide a manufacturing method of a wire capable of manufacturing a wire securing good flexibility and cut-off performance while suppressing cost, and excellent in convenience and workability during use, and the wire.SOLUTION: A manufacturing method of a wire 1 has a process for forming a wire core twisted body 10, a process for spirally winding a band-shaped first holding member 41 having self fusion property around an outer periphery of the wire core twisted body 10 so that a gap is formed spirally, a process for spirally winding a band-shaped secondary holding member 42 having self fusion property around the outer periphery of the wire core twisted body 10 around which the first holding member 41 is wound by overlapping both sides in a width direction to the first holding member 41 to cover the spiral gap, and a process for forming a sheath 50 by extrusion processing a sheath material to have a tube shape covering the wire core twisted body 10 around which the first holding member 41 and the second holding member 42 are wound.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of manufacturing an electric wire including a cored strand including a plurality of stranded insulated wires and a sheath covering the cored core, and a wire.

  Conventionally, a method of manufacturing a wire having a plurality of insulated wire cores has been proposed. For example, one of the conventional methods of manufacturing an electric wire is a step of twisting a plurality of insulated wires to form a twisted core and a press made of a string or a tape so as to be in close contact with the outer periphery of the twisted core. The process of winding a winding and the process of forming a sheath so that the press-rolling may be covered are provided (for example, refer patent documents 1-3).

  Furthermore, another one of the conventional methods for producing an electric wire comprises the steps of: longitudinally attaching a first tape containing unvulcanized rubber as a main component to the outer circumferential surface of the outer semiconductive layer of the crosslinked polyethylene insulated power cable; A step of winding a second tape based on a fiber containing unvulcanized rubber on the outer peripheral surface to which the tape of 1 is vertically attached with a 1/4 to 1/2 wrap, and winding the second tape And a step of longitudinally attaching a third tape mainly composed of unvulcanized rubber to the attached outer peripheral surface (see, for example, Patent Document 4).

JP-A-57-136725 JP, 2013-235687, A JP, 2017-103176, A JP 2003-168328 A

  For example, when the electric wire manufactured by the manufacturing method of Patent Documents 1 to 3 is buried in the ground, it has to be inserted into a metal corrugate pipe, electric conduit or the like to ensure waterproofness. . As a result, the weight and flexibility of the wire may be reduced and the cost may be increased.

  The electric wire manufactured according to the manufacturing method of Patent Document 4 is manufactured by vertically attaching the first tape and the third tape on the inner peripheral side and the outer peripheral side of the second tape wound in a spiral though it is waterproof. As a result, the flexibility is reduced and the manufacturing cost is increased.

  In addition, it is difficult for the electric wires manufactured by the manufacturing methods of Patent Documents 1 to 4 to cut together and hold together with the sheath at the time of use and remove them together as a holding member such as a cord or a tape for bundling wire core twisted bodies. Therefore, it is necessary to cut and remove the sheath and the holding member separately, which also takes time and effort to process waste.

  The present invention has been made in view of the above-described circumstances, and the object thereof is to ensure good flexibility and water repellency while suppressing costs, and to be excellent in convenience and workability at the time of use. It is providing the manufacturing method of the electric wire which can manufacture an electric wire, and an electric wire.

In order to achieve the objective mentioned above, the "manufacturing method of electric wire" concerning the present invention is characterized by following (1)-(3).
(1)
What is claimed is: 1. A method of manufacturing an electric wire, comprising: a core strand including a plurality of insulated cores twisted together; and a sheath covering the core strand,
Forming the cored core;
A step of spirally winding a band-shaped first holding member having a self-bonding property in a spiral shape so as to form a gap on the outer circumference of the cored core;
A band shape having a self-bonding property so that both sides in the width direction are superimposed on the first holding member and the spiral gap is covered on the outer periphery of the cored core around which the first holding member is wound. Spirally winding the two holding members;
Forming the sheath by extruding a sheath material to have a tubular shape covering the core strand around which the first and second retaining members are wound.
It is a manufacturing method of electric wire.
(2)
In the manufacturing method according to the above (1),
The overlapping margin of both sides of the second holding member with respect to the first holding member is 1/3 of the width of the second holding member,
It is a manufacturing method of electric wire.
(3)
In the production method described in the above (1) or (2),
The insulated wire core is twisted together with inclusions by alternate twisting to form the twisted core.
It is a manufacturing method of electric wire.

  According to the method of manufacturing the electric wire of the configuration of the above (1), the first holding member having a self-bonding property is spirally wound around a core twist body, and further, a core center twist on which the first holding member is wound. A self-adhesive band-like second holding member is spirally wound on the outer periphery of the body so that both sides in the width direction overlap the first holding member and the spiral gap is covered. As a result, it is possible to obtain an electric wire in which the outer peripheral side of the twisted cored wire is favorably waterproofed by the first holding member and the second holding member that are reliably self-fused at the overlapping portion. Therefore, it is possible to embed directly in the ground without covering the corrugated pipe or the electric pipe for water blocking.

  Furthermore, since the first holding member and the second holding member having self-bonding property are wound to hold the twist of the insulating core of the twisted core, after forming the sheath, the first holding member, the second holding member and The twist of the cored strand is held by the sheath in which the first holding member and the second holding member are self-fused. Therefore, when using the electric wire (when peeling off the skin), the first holding member, the second holding member, and the sheath may be cut together and removed together. Therefore, the use of non-self-adhesive retaining cords and tapes facilitates cutting and removing (peeling) and waste compared to those which must be cut and removed separately when using the electric wire. Handling of

  Furthermore, compared with the electric wire obtained by vertically attaching the first tape and the third tape on the inner circumferential side and the outer circumferential side of the second tape wound spirally, good flexibility is obtained. And the manufacturing cost can be reduced.

  As described above, according to the method of manufacturing the electric wire of the above configuration, good flexibility and water-retaining property are ensured while suppressing the cost, and moreover, the electric wire excellent in convenience and workability at the time of use is easily manufactured. be able to.

  Furthermore, the method of manufacturing the electric wire of the above configuration also has another effect. Specifically, since the first holding member and the second holding member used in the present manufacturing method have a belt-like shape, compared to the case of using a holding member (for example, holding yarn) having a thread-like (string-like) shape Irregularities due to the holding member on the surface of the sheath are less noticeable (or no unevenness occurs if the holding member is sufficiently thin). In addition, the first holding member and the second holding member are less likely to bite into the cored core, and the cored core tends to maintain the designed shape.

  By the way, the above-mentioned "core twist" may include a structure other than an insulation core. For example, the cored body may include inclusions provided between the insulated cores. Furthermore, in the above-mentioned “step of winding the first holding member and the second holding member around the outer periphery of the core twisting body”, the first holding member and the second holding member are wound around the outer periphery of the core center twisting body formed in advance. Alternatively, the formation of the core twisting body and the winding of the first holding member and the second holding member may be performed at once (for example, while forming the core twisting body, the first holding member and the second holding member may be Two holding members may be wound). That is, the formation of the cored core and the winding of the first holding member and the second holding member may be performed as separate steps or may be performed as one step.

  According to the method of manufacturing the electric wire of the configuration of (2), the overlapping margin of both sides of the second holding member with respect to the first holding member is set to 1/3 of the width of the second holding member, the first holding member As a result, it is possible to ensure reliable water blocking in the overlapping portion of the second holding member and the second holding member.

  According to the method of manufacturing the electric wire of the configuration of (3), in the wire core twisted body obtained by twisting the insulating wire core with the inclusions by alternate twisting, the twist of the insulating wire core is likely to be returned at the reverse portion of the twist. However, the twist of the insulating wire core can be reliably held by the first holding member and the second holding member having self-welding property wound around the outer periphery of the cored core.

Furthermore, in order to achieve the objective mentioned above, the "electric wire" which concerns on this invention is characterized by following (4)-(6).
(4)
A twisted core comprising a plurality of insulated cores twisted together,
A self-adhesive band-shaped first holding member spirally wound with a spiral gap on the outer periphery of the cored core;
Self-fusion bonding in which both sides in the width direction are overlapped on the first holding member and spirally wound so as to cover the gap of the first holding member, on the outer periphery of the cored core around which the first holding member is wound. Belt-shaped second holding member having elasticity;
A sheath covering the core strand around which the first holding member and the second holding member are wound;
Be a wire.
(5)
In the electric wire described in the above (4),
The overlapping margin on both sides of the second holding member with respect to the first holding member is set to 1/3 of the width of the second holding member.
Be a wire.
(6)
In the electric wire according to (4) or (5),
The cored strand is formed by twisting the insulated core with inclusions by alternate twisting,
Be a wire.

According to the electric wire of the configuration of the above (4), the band-shaped first holding member having self-bonding property is spirally wound around the core twist body, and further, the outer periphery of the core core twist body around which the first holding member is wound A band-like second holding member having self-adhesiveness is spirally wound so that both sides in the width direction may be overlapped with the first holding member to cover the spiral gap. As a result, the outer peripheral side of the stranded twisted core can be favorably stopped by the first holding member and the second holding member which are reliably self-fused at the overlapping portion. Therefore, it is possible to embed directly in the ground without covering the corrugated pipe or the electric pipe for water blocking. In addition, compared with the electric wire obtained by vertically attaching the first tape and the third tape on the inner peripheral side and the outer peripheral side of the second tape wound in a spiral shape, good flexibility is obtained. And the manufacturing cost can be reduced.
Thus, according to the electric wire of the above-mentioned configuration, it is possible to secure good flexibility and water fastness while suppressing the cost.
In addition, since the first holding member and the second holding member having self-bonding property are wound to hold the twist of the insulating core of the twisted core, the first holding member, the second holding member, and those The twist of the cored strand is held by the sheath in which the first holding member and the second holding member are self-fused. Therefore, when using the electric wire (when peeling off the skin), the first holding member, the second holding member, and the sheath may be cut together and removed together. Therefore, the use of non-self-adhesive retaining cords and tapes facilitates cutting and removing (peeling) and waste compared to those which must be cut and removed separately when using the electric wire. Handling of
According to the electric wire of the configuration of (5), the overlapping margin of both sides of the second holding member with respect to the first holding member is 1/3 of the width of the second holding member. It is possible to ensure a certain water-proofness in the overlapping portion with the second holding member.
According to the electric wire of the structure of said (6), the wire core twisted body twisted together by an alternate twist with an insulation wire core tends to return the twist of an insulating wire core in the inversion part of a twist. However, the twist of the insulating wire core can be reliably held by the first holding member and the second holding member having self-welding property wound around the outer periphery of the cored core.

  According to the present invention, a method of manufacturing an electric wire capable of manufacturing an electric wire excellent in convenience and workability in use while ensuring good flexibility and waterproofness while suppressing costs, and electric wire, Can provide

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the modes for carrying out the invention described below (hereinafter referred to as "embodiments") with reference to the attached drawings.

FIG. 1 is a series of process drawings illustrating a method of manufacturing a wire according to the present invention. Fig.1 (a) shows the process of forming a core twist, FIG.1 (b) shows the process of winding a 1st holding member around a core twist, FIG.1 (c) is a core twist. The process of winding the second holding member is shown, and FIG. 1 (d) shows the step of forming a sheath covering the core strand, the first holding member and the second holding member. FIG. 2 is a schematic view illustrating the structure of the first holding member and the second holding member shown in FIG. FIG. 2A shows a state in which the first holding member is wound, and FIG. 2B shows a state in which the second holding member is wound. FIG. 3 is a schematic view showing a state in which a part of the sheath of the electric wire manufactured by the manufacturing method of FIG. 1 is removed. FIG. 4 is a schematic view illustrating the configuration of a manufacturing apparatus for manufacturing an electric wire by the manufacturing method of FIG. 1. FIG. 5 is a schematic view showing the structure of the electric wire according to the reference example.

  Hereinafter, with reference to the drawings, a method of manufacturing an electric wire (hereinafter referred to as "electric wire 1") according to the present invention and the electric wire will be described.

<Method of manufacturing wire>
The electric wire 1 which concerns on this embodiment is manufactured by a series of processes shown to Fig.1 (a), FIG.1 (b), FIG.1 (c) and FIG.1 (d).

  The process shown in FIG. 1A is a process of forming a cored core 10. The cored core 10 is formed by twisting a plurality of insulated cores 20 and the inclusions 30 by alternate twisting (SZ). The insulated core 20 has a conductor 21 and an insulator 22 covering the conductor 21 (see FIG. 3). Although the number in particular of the insulation core 20 contained in the core twist object 10 is not restrict | limited, It is preferable that it is two to four. In the present example, the cored core 10 has three insulated cores 20, each of which has a size of the conductor 21 of 1.25 to 38sq.

  Specifically, the cored core 10 alternately repeats twisting in one direction (S direction) and twisting in the other direction (Z direction) of the three insulated wire cores 20 and the inclusions 30. According to (SZ twisting) and bundled as a single cored strand 10. Thereby, the core twist body 10 is in the state in which the S twist parts Ts and the Z twist parts Tz are alternately provided along the longitudinal direction. In addition, the distance of the longitudinal direction which advances when one core (one core of a plurality of insulation cores 20) which constitutes core twisting object 10 rotates one round is called "twist pitch length". .

  The process shown in FIG. 1 (b) is a process of winding the first holding member 41 around the cored core 10. In this step, as shown in FIG. 2 (a), a spiral of the band-like first holding member 41 is in direct contact with the outer periphery of the cored core 10 formed in the step of FIG. 1 (a). Wrapped around the

  The first holding member 41 is, for example, a tape-shaped synthetic rubber such as butyl rubber, and has self-adhesiveness. As shown in FIG. 2A, the first holding member 41 has a width W1 of 10 to 25 mm and a thickness T1 of 0.4 to 0.6 mm. When the first holding member 41 is wound around the twisted core body 10 by a holding member winding portion 64 described later, a tension is applied, and the first holding member 41 is stretched by about 1.5 to 2.5 times and wound. When the first holding member 41 is spirally wound around the outer periphery of the core twist body 10, the inclination (winding angle) of the first holding member 41 with respect to the axial direction of the core center twist body 10 Is preferably set to be 55 to 65 °. In addition, when the diameter of the core center twist body 10 is about 7-23 mm, if the width W1 of the 1st holding member 41 is 10-25 mm, winding by the winding angle mentioned above is attained.

  The helical pitch length P1 (see FIG. 1B) of the first holding member 41 is, for example, 10 to 25 mm. When the first holding member 41 is spirally wound around the outer periphery of the core twist body 10, while the gap G1 of about 1/3 of the width W1 is opened in the direction orthogonal to the spiral winding direction It is helically wound around the outer periphery of the body 10.

  The step shown in FIG. 1 (c) is a step of winding the second holding member 42 around the cored core 10. In the present step, a band-like second holding member 42 closes the gap G1 of the first holding member 41 on the outer periphery of the twisted core body 10 on which the first holding member 41 is wound in the step of FIG. As it is spirally wound.

  Like the first holding member 41, the second holding member 42 is, for example, a tape-shaped synthetic rubber such as butyl rubber, and has self-adhesiveness. As shown in FIG. 2B, the second holding member 42 has a width W2 of 10 to 25 mm and a thickness T2 of 0.4 to 0.6 mm. When the second holding member 42 is wound around the cored core 10 by a holding member winding portion 64 described later, a tension is applied, and the second holding member 42 is stretched by about 1.5 to 2.5 times and wound. Similarly to the width W1 of the first holding member 41 described above, the width W2 of the second holding member 42 is preferably determined so that the winding angle is 55 to 65 °.

  The helical pitch length P2 (see FIG. 1C) of the second holding member 42 is, for example, 10 to 25 mm. When the second holding member 42 is spirally wound around the outer periphery of the core twist body 10 on which the first holding member 41 is wound, the second holding member 42 has about 1/3 of the width W2 in the direction orthogonal to the spiral winding direction. The spiral wound around the outer periphery of the cored core 10 while leaving a gap G2 of The second holding member 42 is wound while being superimposed on the first holding member 41 on both sides thereof. The overlapping margin on both sides of the second holding member 42 with respect to the first holding member 41 is set to 1/3 of the width W 2 of the first holding member 41.

  In the present embodiment, holding members of the same dimension and made of the same material are used as the first holding member 41 and the second holding member 42. Therefore, the width W1 and the thickness T1 of the first holding member 41 are the same as the width W2 and the thickness T2 of the second holding member 42, and the helical pitch length P2 and the gap G2 when winding the second holding member 42. Is the same as the helical pitch length P1 and the gap G1 when the first holding member 41 is wound.

  The step shown in FIG. 1D is a step of forming a sheath 50 on the outer side of the cored strand 10. In this step, the sheath 50 covers the outer periphery of the cored core 10 on which the first holding member 41 and the second holding member 42 are wound in the steps shown in FIGS. 1 (b) and 1 (c). The sheath 50 is formed of, for example, a synthetic resin such as polyvinyl chloride and polyethylene. The sheath 50 is formed by extruding the heat-melted sheath material so as to have a tubular shape on the outer periphery of the core twist body 10 in which the first holding member 41 and the second holding member 42 are wound around the outer periphery. Ru. As a result, the core strand 10, the first holding member 41 and the second holding member 42 are protected by the sheath 50. The sheath 50 is provided with an anticorrosive layer on the outer peripheral surface thereof. The anticorrosive layer is provided, for example, on the outer peripheral surface of the sheath 50 by coating or the like.

<Structure of manufactured wire>
The electric wire 1 (the electric wire 1 as a product) includes the wire core twister 10, the first holding member 41, the second holding member 42, and the sheath 50. The core twisting body 10 is a twisting body including a plurality of twisted insulation cores 20, and the first holding member 41 spirals around the outer circumference of the core twisting body 10 to make the core center twisting body 10 It is fusion-bonded to the outer peripheral surface by self-fusion. The second holding member 42 spirals around the outer periphery of the core twist body 10 and fuses to the outer peripheral surface of the core twist body 10 and the first holding member 41 by self-fusion. The second holding member 42 is wound so as to close the gap G1 of the first holding member 41 formed along the spiral of the first holding member 41 and so that both sides thereof overlap the first holding member 41. The overlapping margin on both sides of the second holding member 42 with respect to the first holding member 41 is set to 1/3 of the width W 2 of the first holding member 41. The sheath 50 is provided to cover the core strand 10, the first holding member 41, and the second holding member 42, and the first holding member 41 and the second holding member 42 are self-fused on the inner peripheral surface thereof. Are fused by In FIG. 3, in a region where a part of the sheath 50 is removed, it can be seen that the first holding member 41 and the second holding member 42 are in close contact (fusion) with the inner circumferential surface of the sheath 50, A state in which the cored core 10 is removed is shown.

<Manufacturing equipment>
Then, the manufacturing apparatus which manufactures the electric wire 1 by said manufacturing method is demonstrated.

  As shown in FIG. 4, the manufacturing apparatus 60 for manufacturing the electric wire 1 includes the insulated wire core supply unit 61 and the inclusion supply unit 62. The insulated wire core supply unit 61 is a general reel or the like, and a plurality of insulated wire cores 20 are drawn out from the insulated wire core supply unit 61. The inclusions 30 are fed out from the inclusion supply unit 62.

  On the downstream side of the insulated wire core supply unit 61 and the inclusion supply unit 62, an SZ twist unit 63 is provided. The plurality of insulated wire cores 20 drawn out from the insulated wire core supply unit 61 and the inclusions 30 drawn out from the inclusion supply unit 62 are fed to the SZ twist unit 63. The SZ twisting portion 63 has a general SZ twisting mechanism, and twists a plurality of insulating wire cores 20 and inclusions 30 by alternate twisting (SZ twisting) to form a wire core twisting body 10 ing.

  On the downstream side of the SZ twist portion 63, a holding member winding portion 64 and a sheath forming portion 65 are provided in order. The holding member winding portion 64 has a general winding mechanism, and helically winds the first holding member 41 and the second holding member 42 around the wire core strand 10 fed from the SZ twist portion 63. The holding member winding portion 64 closes the gap G1 of the first holding member 41 substantially at the same time as the first holding member 41 is spirally wound so that the gap G1 is formed around the core twist body 10. As described above, the second holding member 42 is spirally wound with the gap G2 opened so that both sides thereof overlap the first holding member 41. The sheath forming portion 65 has a general sheath forming mechanism, and forms a sheath 50 so as to cover the periphery of the cored core 10 around which the first holding member 41 and the second holding member 42 are wound.

Here, the electric wire which concerns on a reference example is demonstrated.
FIG. 5 is a schematic view showing the structure of the electric wire according to the reference example.

  As shown in FIG. 5, in the electric wire 1A according to the reference example, in place of the first holding member 41 and the second holding member 42, a polyester holding cord 70 is spirally wound. In the core strand twisting body 10 in which the insulating core 20 and the inclusions 30 are alternately twisted (SZ twisting), the twisting is likely to occur because the insulating core 20 and the inclusions 30 are along the axial direction. 200-300 mm) is formed. The holding cord 70 can hold the twist also in the inverted portion of the cored core 10, but the electric wire 1A can not be made waterproof. Therefore, when the electric wire 1A is buried in the ground, it has to be inserted into a metal corrugated pipe or electric wire pipe and the like to be sheathed, resulting in weight reduction, flexibility decrease and cost increase. Moreover, in the electric wire 1A, the holding cord 70 can not be cut together and removed together with the sheath 50 at the time of use. Therefore, it is necessary to separately cut and remove the sheath 50 and the holding cord 70, which also takes time and effort to process waste.

  On the other hand, according to the present embodiment, the first holding member 41 having a self-bonding property is spirally wound around the core twist body 10, and further, a wire core twist in which the first holding member 41 is wound. A band-like second holding member 42 having self-adhesiveness is spirally wound around the outer periphery of the body 10 so that both sides in the width direction are overlapped with the first holding member 41 and the spiral gap G1 is covered. Thereby, the electric wire 1 by which the outer peripheral side of the core-center twisting body 10 was favorably water-stopped by the 1st holding member 41 and the 2nd holding member 42 which self-fuse in an overlap part reliably can be obtained. Therefore, it is possible to embed directly in the ground without covering the corrugated pipe or the electric pipe for water blocking.

  Further, since the first holding member 41 and the second holding member 42 having self-bonding property are wound to hold the twist of the insulating core 20 of the twisted core body 10, after forming the sheath, the first holding member 41, The twist of the cored core 10 is held by the sheath 50 in which the second holding member 42 and the first holding member 41 and the second holding member 42 are self-fused. Therefore, when using the electric wire 1 (when peeling off the skin), the first holding member 41, the second holding member 42, and the sheath 50 may be cut together and removed collectively. Therefore, the use of non-self-adhesive retaining cords and tapes facilitates cutting and removing (peeling) and waste compared to those which must be cut and removed separately when using the electric wire. Handling of

  In addition, compared with the electric wire obtained by vertically attaching the first tape and the third tape on the inner peripheral side and the outer peripheral side of the second tape wound in a spiral shape, good flexibility is obtained. And the manufacturing cost can be reduced.

  As described above, according to the method of manufacturing the electric wire of the above configuration, good flexibility and water-retaining property are ensured while suppressing the cost, and moreover, the electric wire excellent in convenience and workability at the time of use is easily manufactured. be able to.

  Further, by setting the overlapping margin on both sides of the second holding member 42 with respect to the first holding member 41 to 1⁄3 of the width W 2 of the second holding member 42, the overlap between the first holding member 41 and the second holding member 42 is It is possible to secure a certain level of water blocking in the overlapping portion.

  In addition, the method of manufacturing the electric wire of the above configuration also has another effect. Specifically, since the first holding member 41 and the second holding member 42 used in the present manufacturing method have a belt-like shape, when using a holding member (for example, holding yarn) having a thread-like (string-like) shape Compared to the above, unevenness due to the holding member is less noticeable on the surface of the sheath 50 (or when the holding member is sufficiently thin, the unevenness does not occur). Further, the first holding member 41 and the second holding member 42 are less likely to bite into the wire core twisting body 10, and the wire center twisting body 10 can easily maintain the designed shape.

<Other aspects>
The present invention is not limited to the above embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the embodiments described above, and appropriate modifications, improvements, etc. are possible. In addition, the material, shape, size, number, arrangement location, and the like of each component in the embodiment described above are arbitrary and not limited as long as the present invention can be achieved.

  For example, in the present embodiment (FIG. 1), the cored core 10 is SZ twisted. However, the cored core 10 may be S-twisted or Z-twisted. Furthermore, in the present embodiment (FIG. 4), the formation of the cored strand 10 and the winding of the first holding member 41 and the second holding member 42 around the cored core 10 may be separate steps, and 3) These steps may be combined into one, and the formation of the cored core 10 and the winding of the first holding member 41 and the second holding member 42 may be performed collectively.

Here, the manufacturing method of the electric wire concerning the present invention mentioned above, and the feature of the embodiment of an electric wire are briefly summarized and listed to the following (1)-(6), respectively.
(1)
A manufacturing method of an electric wire (1) comprising a core strand twisting body (10) including a plurality of insulated core strands (20) twisted together and a sheath (50) covering the core core twisting body (10). ,
Forming the cored core (10);
A step of spirally winding a band-shaped first holding member (41) having a self-bonding property in a spiral shape so as to form a gap (G1) on the outer periphery of the core center twist body (10);
The spiral holding gap (G1) is covered by overlapping both sides in the width direction on the first holding member (41) on the outer periphery of the twisted core body (10) around which the first holding member (41) is wound. Spirally winding the band-like second holding member (42) having self-bonding property;
The sheath (50) is extruded by extruding a sheath material so as to have a tubular shape covering the twisted core (10) wound with the first holding member (41) and the second holding member (42). And b) forming
How to make a wire.
(2)
In the manufacturing method described in (1),
The overlapping margin on both sides of the second holding member (42) with respect to the first holding member (41) is set to 1/3 of the width (W2) of the second holding member (42).
How to make a wire.
(3)
In the manufacturing method according to (1) or (2),
The insulating core (20) is twisted together with the inclusions (30) by alternate twisting to form the core twisted body (10).
How to make a wire.
(4)
A twisted core (10) comprising a plurality of insulated cores (20) twisted together;
A band-shaped first holding member (41) having self-adhesiveness, which is spirally wound with a spiral gap (G1) opened around the outer periphery of the cored core (10);
Both sides in the width direction are overlapped with the first holding member (41) on the outer periphery of the twisted core body (10) around which the first holding member (41) is wound, and the first holding member (41) A self-adhesive band-like second holding member (42) spirally wound so as to cover the gap (G1);
A sheath (50) covering the core strand (10) around which the first holding member (41) and the second holding member (42) are wound;
Electrical wire.
(5)
In the electric wire (1) described in (4),
The overlapping margin on both sides of the second holding member (42) with respect to the first holding member (41) is set to 1/3 of the width (W2) of the second holding member (42).
Electrical wire.
(6)
In the electric wire (1) described in (4) or (5),
The cored strand (10) is formed by twisting the insulated core (20) together with the inclusions (30) by alternate twisting.
Electrical wire.

DESCRIPTION OF SYMBOLS 1 electric wire 10 wire core twisted body 20 insulated wire core 30 inclusion 41 first holding member 42 second holding member 50 sheath

Claims (6)

What is claimed is: 1. A method of manufacturing an electric wire, comprising: a core strand including a plurality of insulated cores twisted together; and a sheath covering the core strand,
Forming the cored core;
A step of spirally winding a band-shaped first holding member having a self-bonding property in a spiral shape so as to form a gap on the outer circumference of the cored core;
A band shape having a self-bonding property so that both sides in the width direction are superimposed on the first holding member and the spiral gap is covered on the outer periphery of the cored core around which the first holding member is wound. Spirally winding the two holding members;
Forming the sheath by extruding a sheath material to have a tubular shape covering the core strand around which the first and second retaining members are wound.
How to make a wire. In the manufacturing method according to claim 1,
The overlapping margin of both sides of the second holding member with respect to the first holding member is 1/3 of the width of the second holding member,
How to make a wire. In the manufacturing method according to claim 1 or 2,
The insulated wire core is twisted together with inclusions by alternate twisting to form the twisted core.
How to make a wire. A twisted core comprising a plurality of insulated cores twisted together,
A self-adhesive band-shaped first holding member spirally wound with a spiral gap on the outer periphery of the cored core;
Self-fusion bonding in which both sides in the width direction are overlapped on the first holding member and spirally wound so as to cover the gap of the first holding member, on the outer periphery of the cored core around which the first holding member is wound. Belt-shaped second holding member having elasticity;
A sheath covering the core strand around which the first holding member and the second holding member are wound;
Electrical wire. In the electric wire according to claim 4,
The overlapping margin on both sides of the second holding member with respect to the first holding member is set to 1/3 of the width of the second holding member.
Electrical wire. In the electric wire according to claim 4 or claim 5,
The cored strand is formed by twisting the insulated core with inclusions by alternate twisting,
Electrical wire.

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