JP6989329B2 - Manufacturing method of electric wire and electric wire - Google Patents

Description

The present invention relates to a method for manufacturing an electric wire including a wire core twisted body including a plurality of twisted insulated wire cores and a sheath covering the wire core twisted body, and an electric wire.

Conventionally, a method for manufacturing an electric wire having a plurality of insulated cores has been proposed. For example, one of the conventional methods for manufacturing an electric wire is a process of twisting a plurality of insulated wire cores to form a wire core twisted body, and a presser made of a string or tape so as to be in close contact with the outer periphery of the wire core twisted body. It includes a step of winding a roll and a step of forming a sheath so as to cover the presser roll (see, for example, Patent Documents 1 to 3).

Further, another method of manufacturing a conventional electric wire is a step of vertically attaching a first tape mainly composed of unvulcanized rubber to the outer peripheral surface of the outer semi-conductive layer of the cross-linked polyethylene insulated power cable. A process of wrapping 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 1/4 to 1/2 wrap, and a process of wrapping the second tape. A step of vertically attaching a third tape containing unvulcanized rubber as a main component to the attached outer peripheral surface is provided (see, for example, Patent Document 4).

Japanese Unexamined Patent Publication No. 57-136725 Japanese Unexamined Patent Publication No. 2013-23587 Japanese Unexamined Patent Publication No. 2017-103176 Japanese Unexamined Patent Publication No. 2003-168328

When the electric wire manufactured by the manufacturing method of Patent Documents 1 to 3 is buried in the ground, for example, it must be inserted into a metal corrugated tube, a conduit tube, or the like to ensure water stopping. .. Therefore, the weight of the electric wire is increased, the flexibility is lowered, and the cost is increased.

Although the electric wire manufactured by the manufacturing method of Patent Document 4 has water stopping property, the first tape and the third tape are vertically attached to the inner peripheral side and the outer peripheral side of the second tape wound spirally. Therefore, the flexibility is lowered and the manufacturing cost is increased.

Moreover, in the electric wire manufactured by the manufacturing methods of Patent Documents 1 to 4, it is difficult to collectively remove the holding member such as a string or tape for bundling the core twisted body by cutting it together with the sheath at the time of use. Therefore, the sheath and the holding member must be cut and removed separately, and it takes time and effort to dispose of the waste.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to ensure good flexibility and water-stopping property while suppressing costs, and to have excellent convenience and workability during use. It is an object of the present invention to provide a method of manufacturing an electric wire capable of manufacturing an electric wire, and an electric wire.

In order to achieve the above-mentioned object, the "method for manufacturing an electric wire" according to the present invention is characterized by the following (1) to (3).
(1)
A method for manufacturing an electric wire, comprising: a wire core twisted body including a plurality of twisted insulated wire cores and a sheath covering the wire core twisted body.
The process of forming the wire core twisted body and
A band-shaped first holding member having self-bonding property is formed on the outer periphery of the wire core twisted body so that a spiral gap is formed , and the gap is 1/3 of the width of the first holding member. The process of spiral winding and
A band-shaped first holding member having self-fusion properties so as to overlap the first holding member on both sides in the width direction and cover the spiral gap on the outer periphery of the wire core twisted body around which the first holding member is wound. (Ii) The process of spirally winding the holding member and
The sheath material is extruded so as to have a tube shape covering the wire core twisted body around which the first holding member and the second holding member are wound to form the sheath.
It is a manufacturing method of electric wires.
(2)
A method for manufacturing an electric wire, comprising: a wire core twisted body including a plurality of twisted insulated wire cores and a sheath covering the wire core twisted body.
The process of forming the wire core twisted body and
A step of spirally winding a band-shaped first holding member having self-bonding property on the outer periphery of the wire core twisted body so as to form a spiral gap.
A band-shaped first holding member having self-fusion properties so as to overlap the first holding member on both sides in the width direction and cover the spiral gap on the outer periphery of the wire core twisted body around which the first holding member is wound. (Ii) The process of spirally winding the holding member and
The sheath material is provided with a step of forming the sheath by extruding the sheath material so as to have a tube shape covering the wire core twisted body around which the first holding member and the second holding member are wound.
The overlap 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.
It is a manufacturing method of electric wires.
(3)
In the manufacturing method according to (1) or (2) above,
The insulated wire core is twisted together with inclusions by alternating twisting to form the wire core twisted body.
It is a manufacturing method of electric wires.

According to the method for manufacturing an electric wire having the configuration of (1) above, a self-bonding band-shaped first holding member is spirally wound around a wire core twist body, and further, a wire core twist around which the first holding member is wound. A band-shaped second holding member having self-bonding property is spirally wound around the outer periphery of the body so as to overlap the first holding member on both sides in the width direction and cover the spiral gap. As a result, it is possible to obtain an electric wire in which the outer peripheral side of the core stranded wire is satisfactorily stopped by the first holding member and the second holding member that are surely self-fused at the overlapping portion. Therefore, it can be directly buried in the ground without exteriorizing the corrugated pipe or the electric wire pipe for stopping water.

Further, since the self-bonding first holding member and the second holding member are wound to hold the twist of the insulated wire core of the wire core twisted body, after the sheath is formed, the first holding member, the second holding member and the second holding member The twist of the core twisted body is held by the sheath in which these first holding member and the second holding member are self-fused. Therefore, when the electric wire is used (when peeling), the first holding member, the second holding member, and the sheath may be cut together and removed together. Therefore, by using a holding string or tape that does not have self-bonding properties, it is easier to cut and remove (peeling) and waste compared to those that must be cut and removed separately when using electric wires. Is also easy to handle.

Further, better flexibility is obtained as compared with the electric wire obtained by vertically attaching the first tape and the third tape to the inner peripheral side and the outer peripheral side of the second tape wound spirally. Moreover, the manufacturing cost can be suppressed.

As described above, according to the method for manufacturing an electric wire having the above configuration, it is possible to easily manufacture an electric wire having good flexibility and water-stopping property while suppressing the cost, and having excellent convenience and workability during use. be able to.

Further, the method for manufacturing an electric wire having the above configuration has yet another effect. Specifically, since the first holding member and the second holding member used in the present manufacturing method have a band-like shape, compared with the case where a holding member having a thread-like (string-like) shape (for example, a holding thread) is used. , The unevenness caused by the holding member is inconspicuous on the surface of the sheath (or, if the holding member is sufficiently thin, the unevenness does not occur). Further, it is difficult for the first holding member and the second holding member to bite into the wire core twisted body, and the wire core twisted body can easily maintain the shape as designed.

By the way, the above-mentioned "wire core twisted body" may include a structure different from the insulated wire core. For example, the wire core twisted body may include inclusions provided between the insulated wire cores. Further, in the above-mentioned "step of winding the first holding member and the second holding member around the outer circumference of the wire core twisted body", the first holding member and the second holding member are wound around the outer circumference of the wire core twisted body formed in advance. Alternatively, the formation of the wire core twisted body and the winding of the first holding member and the second holding member may be performed collectively (for example, while forming the wire core twisted body, the first holding member and the second holding member and the second holding member may be wound. (Ii) A holding member may be wound around the body). That is, the formation of the wire core twisted body 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 for manufacturing an electric wire having the configuration of (2) above, the overlap 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, so that the first holding member can be manufactured. It is possible to ensure reliable water stopping at the overlapped portion between the second holding member and the second holding member.

According to the method for manufacturing an electric wire having the configuration of (3) above, in a wire core twisted body in which an insulated wire core is twisted together with inclusions by alternating twisting, the twist of the insulated wire core is likely to return at the inverted portion of the twist. However, the twist of the insulated wire core can be reliably held by the self-bonding first holding member and the second holding member wound around the outer periphery of the wire core twisted body.

Further, in order to achieve the above-mentioned object, the "electric wire" according to the present invention is characterized by the following (4) to (6).
(4)
A wire core twisted body containing a plurality of twisted insulated wire cores,
A band-shaped first holding member having a self-bonding property, which is spirally wound around the outer periphery of the wire core twisted body with a spiral gap, and the gap is 1/3 of the width of the first holding member. The first holding member , which is
Self-bonding on the outer circumference of the wire core twisted body around which the first holding member is wound so that both sides in the width direction are overlapped with the first holding member and spirally wound so as to cover the gap of the first holding member. A strip-shaped second holding member with properties,
It has a sheath for covering the wire core twisted body around which the first holding member and the second holding member are wound.
Must be an electric wire.
(5)
A wire core twisted body containing a plurality of twisted insulated wire cores,
A band-shaped first holding member having self-bonding property, which is spirally wound around the outer periphery of the wire core twisted body with a spiral gap,
Self-bonding on the outer circumference of the wire core twisted body around which the first holding member is wound so that both sides in the width direction are overlapped with the first holding member and spirally wound so as to cover the gap of the first holding member. A strip-shaped second holding member with properties,
It has a sheath for covering the wire core twisted body around which the first holding member and the second holding member are wound.
The overlap 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.
Must be an electric wire.
(6)
In the electric wire described in (4) or (5) above,
The wire core twisted body is formed by twisting the insulated wire core together with inclusions by alternating twisting.
Must be an electric wire.

According to the electric wire having the configuration of (4) above, the self-bonding band-shaped first holding member is spirally wound around the core twisted body, and further, the outer circumference of the wire core twisted body around which the first holding member is wound. A band-shaped second holding member having self-bonding property is spirally wound so as to overlap the first holding member on both sides in the width direction and cover the spiral gap. As a result, the outer peripheral side of the core stranded wire can be satisfactorily water-stopped by the first holding member and the second holding member that are reliably self-fused at the overlapping portion. Therefore, it can be directly buried in the ground without exteriorizing the corrugated pipe or the electric wire pipe for stopping water. In addition, better flexibility is obtained as compared with the electric wire obtained by vertically attaching the first tape and the third tape to the inner peripheral side and the outer peripheral side of the second tape wound spirally. Moreover, the manufacturing cost can be suppressed.
As described above, according to the electric wire having the above configuration, good flexibility and water stopping property can be ensured while suppressing the cost.
Further, since the first holding member and the second holding member having self-bonding property are wound to hold the twist of the insulating wire core of the wire core twisted body, the first holding member, the second holding member and these are held. The twist of the core strand is held by the sheath in which the first holding member and the second holding member are self-fused. Therefore, when the electric wire is used (when peeling), the first holding member, the second holding member, and the sheath may be cut together and removed together. Therefore, by using a holding string or tape that does not have self-bonding properties, it is easier to cut and remove (peeling) and waste compared to those that must be cut and removed separately when using electric wires. Is also easy to handle.
According to the electric wire having the configuration of (5) above, the overlap margin on 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. (Ii) Reliable water stoppage can be ensured at the overlapped portion with the holding member.
According to the electric wire having the configuration of (6) above, in the wire core twisted body in which the insulated wire core is twisted together with the inclusions by alternate twisting, the twist of the insulated wire core is likely to be returned at the inverted portion of the twist. However, the twist of the insulated wire core can be reliably held by the self-bonding first holding member and the second holding member wound around the outer periphery of the wire core twisted body.

According to the present invention, a method for manufacturing an electric wire, a method for manufacturing an electric wire, a method for manufacturing an electric wire, which can secure good flexibility and water-stopping property while suppressing a cost, and which is excellent in convenience and workability at the time of use, and an electric wire, Can be provided.

The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through the embodiments described below (hereinafter referred to as "embodiments") with reference to the accompanying drawings.

FIG. 1 is a series of process diagrams illustrating a method for manufacturing an electric wire according to the present invention. 1 (a) shows a step of forming a wire core twist, FIG. 1 (b) shows a process of winding a first holding member around a wire core twist, and FIG. 1 (c) shows a step of winding a first holding member around the wire core twist. (2) The process of winding the holding member is shown, and FIG. 1 (d) shows the process of forming a sheath for covering the wire core twisted body, the first holding member and the second holding member. FIG. 2 is a schematic view illustrating the structures 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 diagram illustrating the configuration of a manufacturing apparatus for manufacturing an electric wire by the manufacturing method of FIG. FIG. 5 is a schematic view showing the structure of the electric wire according to the reference example.

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

<Manufacturing method of electric wire>
The electric wire 1 according to the present embodiment is manufactured by a series of steps shown in FIGS. 1 (a), 1 (b), 1 (c) and 1 (d).

The step shown in FIG. 1A is a step of forming the wire core twisted body 10. The wire core twist body 10 is formed by twisting a plurality of insulated wire cores 20 and inclusions 30 by alternate twisting (SZ twisting). The insulating wire core 20 has a conductor 21 and an insulator 22 that covers the conductor 21 (see FIG. 3). The number of the insulated wire cores 20 included in the wire core twisted body 10 is not particularly limited, but is preferably 2 to 4. In this example, the wire core twist 10 has three insulated wire cores 20 having a conductor 21 having a size of 1.25 to 38 sq.

Specifically, the wire core twisting body 10 alternately repeats twisting the three insulated wire cores 20 and inclusions 30 in one direction (S direction) and twisting in the other direction (Z direction). It is alternately twisted (SZ twisted) and bundled as one core twisted body 10. As a result, the wire core twisted body 10 is in a state in which the S twisted portion Ts and the Z twisted portion Tz are alternately provided along the longitudinal direction. The distance in the longitudinal direction traveled when one wire core (one of the plurality of insulated wire cores 20) constituting the wire core twist body 10 makes one rotation is referred to as "twisting pitch length". ..

The step shown in FIG. 1B is a step of winding the first holding member 41 around the wire core twisted body 10. In this step, as shown in FIG. 2 (a), the strip-shaped first holding member 41 spirals so as to be in direct contact with the outer periphery of the wire core twisted body 10 formed in the step of FIG. 1 (a). Wrapped in a shape.

The first holding member 41 is formed of, for example, a synthetic rubber such as butyl rubber in the form of a tape, and has self-bonding property. 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 wire core twist body 10 by the holding member winding portion 64 described later, tension is applied to the first holding member 41, and the first holding member 41 is stretched to about 1.5 to 2.5 times and wound. The width W1 of the first holding member 41 is the inclination (winding angle) of the first holding member 41 with respect to the axial direction of the wire core twist body 10 when the first holding member 41 is spirally wound around the outer circumference of the wire core twist body 10. Is preferably set to be 55 to 65 °. When the diameter of the wire core twist 10 is about 7 to 23 mm and the width W1 of the first holding member 41 is 10 to 25 mm, winding at the above-mentioned winding angle is possible.

The spiral 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 circumference of the wire core twist body 10, the wire core twist is performed while leaving a gap G1 of about 1/3 of the width W1 in a direction orthogonal to the spiral winding direction. It is spirally wound around the outer circumference of the body 10.

The step shown in FIG. 1 (c) is a step of winding the second holding member 42 around the wire core twist body 10. In this step, a band-shaped second holding member 42 closes the gap G1 of the first holding member 41 on the outer periphery of the wire core twisted body 10 around which the first holding member 41 is wound in the step of FIG. 1B. It is wound in a spiral like this.

Like the first holding member 41, the second holding member 42 is formed of synthetic rubber such as butyl rubber in a tape shape and has self-bonding property. 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 wire core twist body 10 by the holding member winding portion 64 described later, tension is applied to the second holding member 42, and the second holding member 42 is stretched to about 1.5 to 2.5 times and wound. It is preferable that the width W2 of the second holding member 42 is also set so that the winding angle is 55 to 65 °, similarly to the width W1 of the first holding member 41 described above.

The spiral 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 circumference of the wire core twisted body 10 around which the first holding member 41 is wound, the second holding member 42 is approximately 1/3 of the width W2 in a direction orthogonal to the spiral winding direction. It is spirally wound around the outer circumference of the core twisted body 10 while opening a gap G2. The second holding member 42 is wound while overlapping both sides of the second holding member 42 with the first holding member 41. The overlap margin on both sides of the second holding member 42 with respect to the first holding member 41 is 1/3 of the width W2 of the first holding member 41.

In this example, as the first holding member 41 and the second holding member 42, holding members having the same dimensions and formed of the same material are used. Therefore, the width W1 and the thickness T1 of the first holding member 41 have the same dimensions as the width W2 and the thickness T2 of the second holding member 42, and the spiral pitch length P2 and the gap G2 when winding the second holding member 42. Is the same as the spiral 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 outside of the wire core twisted body 10. In this step, the outer periphery of the wire core twisted body 10 around which the first holding member 41 and the second holding member 42 are wound is covered with the sheath 50 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 a heat-melted sheath material so as to have a tube shape on the outer periphery of a wire core twisted body 10 in which a first holding member 41 and a second holding member 42 are wound around the outer periphery. To. As a result, the wire core twist body 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 anticorrosion layer on the outer peripheral surface thereof. The anticorrosion layer is provided, for example, on the outer peripheral surface of the sheath 50 by coating or the like.

<Structure of manufactured electric wire>
The electric wire 1 (the electric wire 1 as a result) includes a wire core twist body 10, a first holding member 41, a second holding member 42, and a sheath 50. The wire core twist body 10 is a twisted body including a plurality of twisted insulated wire cores 20, and the first holding member 41 spirally circulates around the outer periphery of the wire core twisted body 10 to form the wire core twisted body 10. It is fused to the outer peripheral surface by self-fusion. The second holding member 42 spirally circulates around the outer periphery of the wire core twisted body 10 and is fused to the outer peripheral surface of the wire core twisted 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 to overlap the first holding member 41 on both sides. The overlap 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 first holding member 41. The sheath 50 is provided so as to cover the wire core twist body 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. Is fused by. In FIG. 3, in the 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 (fused) with the inner peripheral surface of the sheath 50. The state in which the core twist body 10 is removed is shown.

<Manufacturing equipment>
Next, a manufacturing apparatus for manufacturing the electric wire 1 by the above manufacturing method will be described.

As shown in FIG. 4, the manufacturing apparatus 60 for manufacturing the electric wire 1 includes an insulated core supply unit 61 and an 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 fed out from the insulated wire core supply unit 61. The inclusions 30 are fed out from the inclusions supply unit 62.

An SZ twisted portion 63 is provided on the downstream side of the insulated wire core supply portion 61 and the inclusion supply portion 62. A plurality of insulated wire cores 20 delivered from the insulated wire core supply section 61 and inclusions 30 delivered from the inclusions supply section 62 are sent to the SZ twisted portion 63. The SZ twisting portion 63 has a general SZ twisting mechanism, and a plurality of insulated wire cores 20 and inclusions 30 are twisted by alternate twisting (SZ twisting) to form a wire core twisted body 10. ing.

On the downstream side of the SZ twisted 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 the first holding member 41 and the second holding member 42 are spirally wound around the core twisted body 10 sent from the SZ twisting portion 63. The holding member winding portion 64 closes the gap G1 of the first holding member 41 substantially at the same time as spirally winding the first holding member 41 so that the gap G1 is formed around the wire core twist body 10. The second holding member 42 is spirally wound with a gap G2 so as to be overlapped with the first holding member 41 on both sides. The sheath forming portion 65 has a general sheath forming mechanism, and forms the sheath 50 so as to cover the circumference of the wire core twisted body 10 around which the first holding member 41 and the second holding member 42 are wound.

Here, the electric wire according to the reference example will be described.
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, a polyester holding string 70 is spirally wound in place of the first holding member 41 and the second holding member 42. In the wire core twisted body 10 in which the insulated wire core 20 and the inclusions 30 are alternately twisted (SZ twisted), the insulated wire core 20 and the inclusions 30 are along the axial direction, so that the twist is easily returned. 200-300 mm) is formed. The holding string 70 can hold the twist even in the inverted portion of the wire core twist body 10, but the electric wire 1A cannot have water stoppage. Therefore, when the electric wire 1A is buried in the ground, it must be inserted into a metal corrugated tube, an electric wire tube, or the like to be used as an exterior, which leads to weight increase, decrease in flexibility, and cost increase. Moreover, in this electric wire 1A, the holding string 70 cannot be collectively removed together with the sheath 50 at the time of use. Therefore, the sheath 50 and the holding string 70 must be cut and removed separately, and it takes time and effort to dispose of the waste.

On the other hand, according to the present embodiment, the band-shaped first holding member 41 having self-bonding property is spirally wound around the wire core twist body 10, and further, the wire core twist around which the first holding member 41 is wound. A band-shaped second holding member 42 having self-bonding property is spirally wound around the outer periphery of the body 10 so as to overlap the first holding member 41 on both sides in the width direction and cover the spiral gap G1. As a result, it is possible to obtain the electric wire 1 in which the outer peripheral side of the core twisted body 10 is satisfactorily stopped by the first holding member 41 and the second holding member 42 which are surely self-fused at the overlapping portion. Therefore, it can be directly buried in the ground without exteriorizing the corrugated pipe or the electric wire pipe for stopping water.

Further, since the first holding member 41 and the second holding member 42 having self-bonding properties are wound to hold the twist of the insulating wire core 20 of the wire core twist body 10, after the sheath is formed, the first holding member 41, The twist of the core twist 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 the electric wire 1 is used (when the skin is peeled off), the first holding member 41, the second holding member 42, and the sheath 50 may be cut together and removed together. Therefore, by using a holding string or tape that does not have self-bonding properties, it is easier to cut and remove (peeling) and waste compared to those that must be cut and removed separately when using electric wires. Is also easy to handle.

In addition, better flexibility is obtained as compared with the electric wire obtained by vertically attaching the first tape and the third tape to the inner peripheral side and the outer peripheral side of the second tape wound spirally. Moreover, the manufacturing cost can be suppressed.

As described above, according to the method for manufacturing an electric wire having the above configuration, it is possible to easily manufacture an electric wire having good flexibility and water-stopping property while suppressing the cost, and having excellent convenience and workability during use. be able to.

Further, by setting the overlap margin on both sides of the second holding member 42 with respect to the first holding member 41 to 1/3 of the width W2 of the second holding member 42, the first holding member 41 and the second holding member 42 can be combined. Reliable water stoppage can be ensured at the overlapped portion.

Further, the method for manufacturing an electric wire having the above configuration has yet another effect. Specifically, since the first holding member 41 and the second holding member 42 used in the present manufacturing method have a band-like shape, when a holding member having a thread-like (string-like) shape (for example, a holding thread) is used. On the surface of the sheath 50, the unevenness caused by the holding member is inconspicuous (or, if 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 twist body 10, and the wire core twist body 10 can easily maintain the shape as designed.

<Other aspects>
The present invention is not limited to each of 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 above-described embodiment, and can be appropriately modified, improved, and the like. In addition, the material, shape, dimensions, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary as long as the present invention can be achieved, and are not limited.

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

Here, the above-mentioned method for manufacturing an electric wire according to the present invention and the features of the embodiment of the electric wire are briefly summarized and listed below (1) to (6), respectively.
(1)
It is a method of manufacturing an electric wire (1) including a wire core twisted body (10) including a plurality of twisted insulated wire cores (20) and a sheath (50) covering the wire core twisted body (10). hand,
The step of forming the wire core twisted body (10) and
A step of spirally winding a band-shaped first holding member (41) having self-bonding property on the outer periphery of the wire core twisted body (10) so as to spirally form a gap (G1).
On the outer circumference of the wire core twisted body (10) around which the first holding member (41) is wound, both sides in the width direction are overlapped with the first holding member (41) to cover the spiral gap (G1). As described above, the step of spirally winding the band-shaped second holding member (42) having self-bonding property, and
The sheath (50) is extruded from the sheath material so as to have a tube shape that covers the wire core twisted body (10) around which the first holding member (41) and the second holding member (42) are wound. ) Is provided,
How to manufacture electric wires.
(2)
In the manufacturing method described in (1),
The overlap 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 manufacture electric wires.
(3)
In the manufacturing method according to (1) or (2),
The insulating wire core (20) is twisted together with the inclusions (30) by alternate twisting to form the wire core twisted body (10).
How to manufacture electric wires.
(4)
A wire core twisted body (10) containing a plurality of twisted insulated wire cores (20), and a wire core twisted body (10).
A band-shaped first holding member (41) having a self-bonding property, which is spirally wound with a spiral gap (G1) on the outer periphery of the wire core twisted body (10),
On the outer circumference of the wire core twisted body (10) around which the first holding member (41) is wound, both sides in the width direction are overlapped with the first holding member (41) to form the first holding member (41). A band-shaped second holding member (42) having a self-bonding property spirally wound so as to cover the gap (G1), and
It has a sheath (50) that covers the wire core twisted body (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 overlap 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) according to (4) or (5),
The wire core twisted body (10) is formed by twisting the insulated wire core (20) together with the inclusions (30) by alternating twisting.
Electrical wire.

1 Electric wire 10 Wire core twisted body 20 Insulated wire core 30 inclusions 41 First holding member 42 Second holding member 50 Sheath

Claims (6)

A method for manufacturing an electric wire, comprising: a wire core twisted body including a plurality of twisted insulated wire cores and a sheath covering the wire core twisted body.
The process of forming the wire core twisted body and
A band-shaped first holding member having self-bonding property is formed on the outer periphery of the wire core twisted body so that a spiral gap is formed , and the gap is 1/3 of the width of the first holding member. The process of spiral winding and
A band-shaped first holding member having self-fusion properties so as to overlap the first holding member on both sides in the width direction and cover the spiral gap on the outer periphery of the wire core twisted body around which the first holding member is wound. (Ii) The process of spirally winding the holding member and
The sheath material is extruded so as to have a tube shape covering the wire core twisted body around which the first holding member and the second holding member are wound to form the sheath.
How to manufacture electric wires. A method for manufacturing an electric wire, comprising: a wire core twisted body including a plurality of twisted insulated wire cores and a sheath covering the wire core twisted body.
The process of forming the wire core twisted body and
A step of spirally winding a band-shaped first holding member having self-bonding property on the outer periphery of the wire core twisted body so as to form a spiral gap.
A band-shaped first holding member having self-fusion properties so as to overlap the first holding member on both sides in the width direction and cover the spiral gap on the outer periphery of the wire core twisted body around which the first holding member is wound. (Ii) The process of spirally winding the holding member and
The sheath material is provided with a step of forming the sheath by extruding the sheath material so as to have a tube shape covering the wire core twisted body around which the first holding member and the second holding member are wound.
The overlap 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.
How to manufacture electric wires. In the manufacturing method according to claim 1 or 2.
The insulated wire core is twisted together with inclusions by alternating twisting to form the wire core twisted body.
How to manufacture electric wires. A wire core twisted body containing a plurality of twisted insulated wire cores,
A band-shaped first holding member having a self-bonding property, which is spirally wound around the outer periphery of the wire core twisted body with a spiral gap, and the gap is 1/3 of the width of the first holding member. The first holding member , which is
Self-bonding on the outer circumference of the wire core twisted body around which the first holding member is wound so that both sides in the width direction are overlapped with the first holding member and spirally wound so as to cover the gap of the first holding member. A strip-shaped second holding member with properties,
It has a sheath for covering the wire core twisted body around which the first holding member and the second holding member are wound.
Electrical wire. A wire core twisted body containing a plurality of twisted insulated wire cores,
A band-shaped first holding member having self-bonding property, which is spirally wound around the outer periphery of the wire core twisted body with a spiral gap,
Self-bonding on the outer circumference of the wire core twisted body around which the first holding member is wound so that both sides in the width direction are overlapped with the first holding member and spirally wound so as to cover the gap of the first holding member. A strip-shaped second holding member with properties,
It has a sheath for covering the wire core twisted body around which the first holding member and the second holding member are wound.
The overlap 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 5.
The wire core twisted body is formed by twisting the insulated wire core together with inclusions by alternating twisting.
Electrical wire.

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