JP6258058B2 - Composite interposer type electric wire - Google Patents

Description

  The present invention relates to a composite interposition type electric wire such as a vinyl insulated vinyl sheath cable.

For example, as shown in FIG. 5, a vinyl-insulated vinyl sheath cable P ′ is formed by twisting a plurality of insulated core wires 1 in which conductors 1a are insulated and coated with polyvinyl chloride 1b via intervening 2 and holding a nonwoven fabric or the like on the outer periphery. After winding the winding tape 3, a configuration in which a sheath 4 made of polyvinyl chloride (hereinafter, referred to as “sheath 4”) is extrusion coated on the outer periphery of the wound tape 3 is generally used (Patent Document 1, FIG. 3, (See FIG. 4).
The press-wound tape 3 finishes the appearance of the cable P ′ in a round shape and prevents the length of the stripe (dent) in the length direction on the surface of the cable sheath 4.

The vinyl-insulated vinyl sheath cable P ′ having this configuration requires the stripping and removal of the sheath 4 and the press-wrapping tape 3 when exposing the insulation core wire 1 at the end of construction, and there is a problem that the workability is poor. It was. In recent years, reduction of manufacturing cost has been demanded.
Under such circumstances, there has been proposed a cable that employs a cross-linked polyethylene blend for the interposition 2 and omits the press-wound tape 3 to reduce the cost (Patent Document 1, Claim 1). FIG. 1).

Japanese Patent No. 3414576 JP 2009-295345 A

The vinyl-insulated vinyl sheath cable that employs a cross-linked polyethylene blend for the interposition 2 is a cross-linked polyethylene shredded article 100 as a cross-linked polyethylene blend in order to prevent welding (adhesion) between the insulation core wire 1 made of vinyl chloride and the sheath 4. A composition comprising 15 to 30 parts by weight of LDPE (low density polyethylene), 5 to 10 parts by weight of a foaming agent, and 25 parts by weight or more of the total composition other than the cross-linked polyethylene shredded product with respect to parts by weight. Adopted (refer to claim 1 of Patent Document 1).
This blending is complicated and requires an additional step of extruding the intervening crosslinked polyethylene blend, resulting in a high-cost cable.

  The present invention is a cable in which a plurality of insulating core wires are twisted together via the interposition under the above-described actual condition, the press winding tape 3 is omitted, and a sheath is directly provided as an outer sheath on the outer periphery of the twisted twisted wires. An object of the present invention is to provide a cable (electric wire) that can be finished in a round shape and is less likely to have a dent in the sheath surface length direction and that is extremely inexpensive.

  A plurality of insulated core wires are twisted together with a paper tape as an intervening, and the sheath is directly extrusion-coated on the outer peripheral surface of the twisted twisted wires, that is, the twisted wires that have been twisted together without the press-wound tape When the cable was directly provided as a sheath on the outer periphery of the sheath, a gap was generated near the contact point between the insulation coating of the insulation core and the sheath, and this gap caused a recess in the sheath surface length direction (comparison below) Examples 1, 4, 7, 10, 13, 16). On the other hand, when the cable was manufactured in the same manner using a polypropylene yarn having low rigidity for the cable, the gap was not generated, but the pressure applied during winding (the caterpillar or capstan of the take-up machine) Due to the pressing pressure, the cable cross section was deformed into a flat shape (see Comparative Examples 3, 6, 9, 12, 15, and 18 below). In any aspect, it was found that the dents and deformations exceeded the acceptable range for the product, resulting in poor appearance.

The present invention has been made based on the above-described actual situation and knowledge. Specifically, a plurality of insulated core wires are twisted together via an intervening layer, and the press-wound tape is omitted, and the twisted twisted wires In a cable directly provided with a sheath on the outer periphery as a sheath, a yarn is used for each of the gaps on both sides in the vicinity of the contact that is divided by the insulation coating of the insulation core and the sheath, and other than the gap The configuration is such that a paper tape is used for the intervening portion.
With this configuration, a composite interposition type electric wire in which paper tape and yarn are present in the interposition is formed, and most of the interposition is constituted by the paper tape, and the insulation coating of the insulation core and the sheath are formed by the yarn that easily enters a narrow gap. Since the interposition near the contact is configured, the appearance is finished in a round shape, and a dent is hardly generated in the vicinity of the contact between the insulation coating of the insulation core and the sheath, and a streak (dent) in the length direction is hardly generated on the sheath surface.

  As the yarn, polypropylene (PP) or a PP added with calcium carbonate (PPC) as an extender can be used as appropriate. The insertion amount (filling amount) of the yarn should be such that the gap around the contact point between the insulation coating of the insulation core and the sheath does not cause an unacceptable dent on the outer surface of the sheath, and the diameter of the insulation core and the core. What is necessary is just to set suitably by experiment etc. according to number, sheath thickness, etc. For example, the total number of deniers is 3000 deniers or more, preferably 6000 deniers or more for each of the gaps on both sides in the vicinity of the contact point divided by the contact between the insulation coating of the insulation core and the sheath. Insert (fill) so that The denier (De) refers to the thickness of a yarn that reaches 1 g at 9000 m, and the total denier refers to the sum of the deniers of a plurality of yarns inserted into each gap (1 In the case of a book yarn, the denier number of that yarn is the total denier number).

As the configuration of the paper tape interposition, in the gap portion between the insulation core wires in the cross section of the cable, the circumscribed circle of the plurality of insulation core wires constituting the stranded wire and the outer circumference circle of each insulation core wire are circumscribed on each circle or When an inscribed virtual circle is assumed, at least the inner portion of the circle is filled with a paper tape, and the other portion is filled with the paper tape as much as possible. For example, in a two-core cable, as shown in FIG. 4, the outer peripheral circle C ₂ of the circumscribed of two insulated wires 1 forming the stranded circle C ₁ and the opposite sides of the insulated wires 1,1 Assuming a virtual circle C ₃ circumscribing or inscribed in each of the circles C ₁ and C ₂ , the inner part of the circle C ₃ is at least filled with paper tape, and the circle C in the circle C ₁ the space S from the _second circle C ₁ and the contact point (insulated wires and contacts of the sheath) a to the imaginary circle C ₃ to fill the paper tape as possible.
By adopting this configuration, it is possible to prevent the cable cross-section from being deformed into a flat shape by the pressure applied when winding the cable, and to make the appearance round.

  As the resin forming the insulation coating and sheath of the insulation core wire, various conventionally used resins can be adopted. If both are made of polyvinyl chloride (PVC), a vinyl insulated vinyl sheath cable is obtained. However, if different resins that do not use the same resin and are difficult to weld are appropriately selected, for example, if cross-linked polyethylene is used for the insulation coating and polyvinyl chloride is used for the sheath, the insulation core (the insulation coating) and the sheath Welding can be effectively prevented.

  In the composite interposition type electric wire having this configuration, the work of removing the presser winding tape 3 is not necessary, and the waste material is reduced. Further, since the winding step of the presser winding tape is eliminated at the time of manufacture, the operation of the twisting machine for replacing the presser winding tape is eliminated and continuous operation is possible.

  In Patent Document 2, a plurality of insulation core wires are twisted through an interposition, and as the interposition, a staple yarn or the like is interposed near the contact between the insulation coating of the insulation core wire and the sheath, and other insulation core wires A cable in which a hollow sealing body is interposed between the sheath and the sheath is disclosed (refer to the literature 2, claim 1, paragraph 0019, FIG. 1 and the like). However, this technique has been made under the problem of weight reduction (paragraph 0009 in the same document), and it is extremely difficult to interpose a hollow sealed body between the traveling insulation core wires in a twisted wire machine. .

  In the present invention, most of the intervention is constituted by the paper tape, and the inclusion near the contact point between the insulation coating of the insulation core and the sheath is constituted by the yarn that easily enters the narrow gap. Indentations are unlikely to occur in the vicinity of the contact between the insulation coating of the insulation core and the sheath. For this reason, it can prevent that the length | straight line | wire (dent) of the length direction arises on the sheath surface. Further, since the press-wound tape is omitted and an inexpensive paper tape can be used for most of the intervening parts, it can be manufactured at a very low cost.

Sectional drawing of one Embodiment of the composite interposition type electric wire which concerns on this invention Sectional view of the other embodiment Sectional view of the other embodiment Interpretation diagram of paper tape Cross section of conventional example

Each embodiment of the present invention is shown in FIG. 1 to FIG. 3, and in each embodiment, a plurality of insulated core wires 1 shown in FIG. 5 are twisted together via an intervening 12 and directly on the outer periphery of the twisted twisted wire. The cables P ₁ , P ₂ , and P ₃ (hereinafter simply referred to as “composite intervening type electric wires P”) in which the sheath 4 is extrusion-coated with a pipe type (without winding the press-wound tape 3).

  For the insulation core wire 1, a conductor 1 a in which an insulation coating 1 b is formed with, for example, cross-linked polyethylene, polyvinyl chloride or the like is adopted, and polyvinyl chloride or the like is used for the sheath 4. The number of cores of the insulated core wire 1 is arbitrary, such as 2 cores shown in FIG. 1, 3 cores shown in FIG. 2, 4 cores, 5 cores shown in FIG.

Intervening 12, the majority, including the inner imaginary circle C ₃ but is made of paper tape 12a, paper tape 12a is rigidity is relatively high material, since it is difficult is inserted into the narrow gap, only the paper tape 12a Then, a gap s is generated on both sides of the contact point a between the insulation coating 1b of the insulation core wire 1 and the sheath 4. The gap s causes a dent in the sheath 4. On the other hand, since the yarn has lower rigidity than the paper tape 12a, the yarn can enter the narrow gap s. For this reason, it is possible to prevent the sheath 4 from being dented by using the yarn 12b at the place where the gap s is generated. There are yarns 12b shown in Table 1, which are commercially available as tapes (flat yarns) having the width and thickness shown in the same table. When used as the intervening 12, the tapes are made into yarns. It is rolled and inserted into the gap s.
The filling (insertion) amount and filling portion of the paper tape 12a and yarn 12b in the intervening 12 are appropriately determined by experiments or the like so as not to cause a dent that causes a problem as a product on the outer surface of the sheath 4.

  In the twisting process of these composite intervening electric wires P, the supply drum, the paper tape 12a, and the yarn 12b of the insulating core wire 1 are installed in the twisting machine, and then each of them is unrolled to form a predetermined guide hole in the eye plate. Let the position pass. At this time, the yarn 12b passes through a required guide hole of the eye plate so as to enter (insert into) the gap s on both sides of the contact point a between the insulating coating 1b and the sheath 4. After completion of preparation, the twisting machine is driven, and the insulated core wire 1 is twisted together with the paper tape 12a and the yarn 12b to produce a twisted wire. Thereafter, a sheath material is extruded and coated on the stranded wire by a pipe type to obtain a composite intervening electric wire P.

In composite interposition type electric wire P1 of the mode shown in Drawing ₁ , Examples 1-6 of the specification shown in Table 2 and Table 3 and Comparative Examples 1-9 were manufactured. At that time, cross-linked polyethylene was used for the insulating coating 1b, and polyvinyl chloride (PVC) was used for the sheath 4. At this time, the Shore D hardness (based on JIS K7215) of the insulation core wire 1b and the sheath 4 was “65” and “33”, respectively.
Further, in the composite-mediated wire _{P 2} of the embodiment shown in FIG. 2, it was prepared Examples 7 to 12 and Comparative Examples 10 to 18 of the specification shown in Table 4 and Table 5. The insulation coating 1b and the sheath 4 at that time were the same as those in Examples 1 to 6 and Comparative Examples 1 to 9, and the Shore D hardness was also the same.

Incidentally, in Table 2 and 4 "gap cross-sectional area (area surrounded by the circumscribed circle C ₁ and the outer peripheral circle C ₂ twisted)" in FIGS. 1-2, a plurality of insulating shown in FIG. 4 The area (S + C ₃ ) surrounded by the circumscribed circle C ₁ of the core wire 1 and the outer peripheral circle C ₂ of the insulating core wire 1 is shown. Further, in Examples 3 and 5, the “filling amount of inclusions with respect to the gap” column, “PP yarn (inserted into the gap s)” column has entries such as “denier number × number” and comparative examples 1 and FIG. 2, and the comparative example without the entry is an embodiment using only the paper tape 12 a as the interposition 12, and the entry in the “PP yarn (inserted into the gap)” section is the same. The comparative example is an aspect in which only the PP yarn 12b is used as the interposition 12 without using the paper tape 12a.

  In these Examples 1-12 and Comparative Examples 1-18, after twisting together by each "twisting pitch" of the "twisting process" shown in Table 3, Table 5, a sheath is extruded to the twisted twisted wire. Table 6 and Table 7 show the “cable appearance evaluation” for the finished products. In this table, “flat deformation” indicates that the cross section of the cable is deformed into a flat shape by the pressure applied during winding.

According to this result, each of Examples 1 to 12 has no “flat deformation”, “sheath dent” is also “slightly”, and can be satisfied as a product in “overall evaluation”. “Slightly good” or higher. In particular, when the total number of deniers of the PP yarns 12b inserted into each gap s is 6000 or more (Examples 2, 4, 6, 8, 10, 12), the overall evaluation is “good” and excellent composite intervention It can be understood that the mold electric wires P ₁ and P ₂ are obtained.

  On the other hand, in each of Comparative Examples 1 to 18, as the intervening 12, only the paper tape 12a (Comparative Examples 1, 4, 7, 10, 13, 16) or only the yarn intervening 12b (3, 6, 9) may be used. 12, 15, 18), even if the yarn 12b is inserted into each gap s, the total denier number is less than 3000 (1500) (Comparative Examples 2, 5, 8, 11, 14, 17). Either “flat deformation” or “sheath dent” occurs, and the “overall evaluation” is “poor” which is insufficient as a product.

In each of the above embodiments, as the resin of the insulating coating 1b and the sheath 4, in addition to the crosslinked polyethylene and PVC, those conventionally used as those materials and the blending ratio thereof can be appropriately adopted. is there. Further, the yarn 12b is not limited to the PP (PPC), and other materials, for example, yarns made of cotton yarn or the like can be used as appropriate.
In addition, in the contact a between the insulation coating 1b and the sheath 4 of the insulation core wire 1, not only the gaps s, s on both sides, but also the yarn 12b exists beyond the contact a portion and the contact a. Of course, the present invention includes such a case.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Insulation core wire 1a Insulation core conductor 1b Insulation coating of insulation core wire 2 Interposition 3 Press winding tape 4 Sheath 12 Interposition 12a Paper tape 12b Yarn P, P ₁ , P ₂ , P ₃ Composite interposition type electric wire s Insulation core wire Air gap near the contact between the insulation coating and the sheath

Claims (2)

  A cable (P) in which a plurality of insulation core wires (1) are twisted together via an interposition (12), and a sheath (4) is provided directly on the outer periphery of the twisted strand wires as an exterior, and the insulation core The yarn (12b) is interposed between the gaps (s, s) on both sides near the contact (a) divided by the contact (a) between the insulation coating (1b) of the wire (1) and the sheath (4). ) And a paper tape (12a) is used for the interposition (12) other than the gap (s).   The composite interposition type electric wire according to claim 1, wherein the total number of deniers of each yarn (12b) used for each gap (s) near both sides of the contact (a) is 3000 or more.

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