WO2023214465A1 - 通信ケーブルおよびその製造方法 - Google Patents

通信ケーブルおよびその製造方法 Download PDF

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Publication number
WO2023214465A1
WO2023214465A1 PCT/JP2022/019586 JP2022019586W WO2023214465A1 WO 2023214465 A1 WO2023214465 A1 WO 2023214465A1 JP 2022019586 W JP2022019586 W JP 2022019586W WO 2023214465 A1 WO2023214465 A1 WO 2023214465A1
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WO
WIPO (PCT)
Prior art keywords
twisted
communication cable
pair
twisting
wires
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/019586
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English (en)
French (fr)
Japanese (ja)
Inventor
宏 小川
雄一郎 中村
正義 河田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Cable Co Ltd
Original Assignee
Fuji Electric Cable Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Electric Cable Co Ltd filed Critical Fuji Electric Cable Co Ltd
Priority to JP2024519164A priority Critical patent/JPWO2023214465A1/ja
Priority to PCT/JP2022/019586 priority patent/WO2023214465A1/ja
Publication of WO2023214465A1 publication Critical patent/WO2023214465A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/04—Cables with twisted pairs or quads with pairs or quads mutually positioned to reduce cross-talk

Definitions

  • the present invention relates to a communication cable and a method for manufacturing the same.
  • Communication cables such as LAN (Local Area Network) cables are used to connect various devices, such as between servers, between servers and switches, and between servers and personal computers.
  • LAN Local Area Network
  • FIG. 1 such a communication cable has a cable core 10 including a plurality of twisted wire pairs 8 made by twisting together a plurality of insulated wires 6 in which a conductor 2 is insulated with an insulator 4.
  • a communication cable 1 is known that has a structure in which the cable is covered with a wrapping 20, a shielding tape 30, and a jacket 40 (for example, Patent Document 1, etc.).
  • the conductor 2 of the insulated wire 6 of the communication cable 1 may be composed of a plurality of wires 2a, as shown in the enlarged cross-sectional view of FIG. 2A.
  • the plurality of wires 2a are twisted in a fixed direction (direction A in FIG. 2B).
  • the twisted wire pair 8 as shown in the schematic diagram of FIG. 3, the insulated wires 6 are twisted in a certain direction (direction B in FIG. 3).
  • the twisting direction A of the strands 2a and the twisting direction B of the twisted wire pair 8 are the same, the strands 2a will be twisted excessively during the production of the twisted wire pair 8, which will affect the electrical characteristics of the communication cable 1. This may occur.
  • the twisting direction A of the strands 2a and the twisting direction B of the twisted wire pair 8 are opposite, the twist of the strands 2a will be untwisted during the production of the twisted wire pair 8, and in this case as well, the electricity of the communication cable 1 will be Characteristics may be affected.
  • the individual insulated wires 6 are rotated in the opposite direction to the twisting direction of the strands 2a (herein also referred to as “untwisting"), and then the plurality of insulated wires 6 are Combining and twisting (also referred to herein as “pair twisting”) is known.
  • the twisting of the strands 2a can be made appropriate if the number of rotations during untwisting and the number of rotations during pair twisting are the same. Specifically, when the twist direction of the strands 2a in each insulated wire 6 is right, the insulated wire 6 is rotated to the left to the extent that the strands 2a are untwisted, and then untwisted in the desired direction. It is believed that if the wires are rotated the same number of times (pair-twisted), the twisted state of the strands 2a will be approximately the same as before untwisting, and the characteristics of the communication cable 1 will be improved.
  • the return loss (RL) which is one of the electrical characteristics of the communication cable 1
  • RL is lower than 200 MHz. It has become clear that spikes occur on the high frequency side.
  • the main object of the present invention is to provide a communication cable with good electrical properties and a method for manufacturing the same.
  • Retwisting rotation rate (%) (number of untwisting rotations of each of the insulated wires) / (pairwise rotation of the two insulated wires) x 100...
  • a communication cable with good electrical characteristics such as return loss (RL) and a method for manufacturing the same are provided.
  • FIG. 2 is a schematic cross-sectional view of a communication cable.
  • FIG. 2 is a schematic cross-sectional view of an insulated wire. It is a schematic diagram which shows the state of the strand in an insulated electric wire. It is a schematic diagram which shows the state of the insulated electric wire of a twisted pair wire. It is a schematic diagram which shows the state of the strand in an insulated electric wire.
  • FIG. 3 is a conceptual diagram for explaining a twist rate.
  • the communication cable is composed of a so-called twisted pair cable for LAN (Local Area Network).
  • the communication cable 1 mainly includes a cable core 10, a winding 20, a shielding tape 30, and a jacket 40.
  • the cable core 10 is composed of a plurality of pairs (four pairs in this case) of twisted wire pairs 8 and a cross interposed 9 for separating the plurality of twisted wire pairs 8 from each other.
  • each twisted wire pair 8 has a configuration in which a plurality of (here, two) insulated wires 6 are twisted together.
  • the insulated wire 6 has a structure in which the conductor 2 is covered with an insulator 4.
  • the conductor 2 is composed of a plurality (seven in this case) of annealed copper wires (strands 2a), and the insulator 4 is composed of polyethylene resin.
  • the arrangement of the strands 2a in the conductor 2 is not particularly limited, and in this embodiment, it is composed of a center strand and six concentric strands arranged concentrically around the center strand. Not limited to configuration.
  • the conductor 2 may be an uncompressed conductor made by simply twisting a plurality of wires 2a together, as shown in FIG. 2A, for example. It may also be a compressed conductor.
  • the cross interposer 9 is made of polyethylene resin.
  • the cross interposition 9 extends in the length direction of the communication cable 1 and separates the twisted wire pairs 8 from each other in a non-contact manner.
  • the cross interposers 9 are twisted along the length direction of the communication cable 1, and accordingly, the twisted wire pairs 8 are also twisted while being separated by the cross interposers 9.
  • a pusher 20 is installed around the cable core 10.
  • the pusher 20 is a member for keeping the distance between the conductor 2 in the cable core 10 and the shielding tape 30 constant.
  • the type of the pusher 20 is not particularly limited, in this embodiment, the pusher 20 is made of, for example, a high-density polyethylene tape.
  • the cable core 10 is wound horizontally along the length direction of the cable core 10 .
  • horizontal winding refers to winding a long tape in a spiral along the length direction of the cable core 10, with the side edges of the tape overlapping the previously wrapped tape. , it means.
  • the thickness and number of the push-wraps 20 are not particularly limited as long as they do not impair the purpose and effects of this embodiment.
  • a shielding tape 30 is installed around the pusher 20.
  • the shielding tape 30 is made of, for example, an Al/PET tape in which aluminum foil (Al) is attached to a polyethylene terephthalate resin substrate (PET), and the shielding tape 30 is wound horizontally along the length direction of the cable core 10. and covers the outer periphery of the pusher 20.
  • the outer cover 40 is made of polyvinyl chloride resin.
  • the jacket 40 is a so-called sheath, and forms the outermost layer of the communication cable 1 by covering the outer periphery of the coil.
  • the twisted wire pairs 8 have a structure in which each insulated wire 6 is twisted back in a direction opposite to the twisting direction of the strands 2a, and then a plurality of insulated wires 6 are twisted in pairs.
  • the state of the strands 2a in the insulated wire 6 will be explained using FIG. 4.
  • FIG. 4A shows the state of the insulated wire 6 before twisting, and in the insulated wire 6, the strands 2a are twisted in the direction indicated by A (rightward in this case). At this time, the strands 2a are appropriately close to each other within the insulator 4.
  • the insulated wire 6 When the insulated wire 6 is twisted in the direction C opposite to the twisting direction A of the strands 2a (here, to the left), the strands 2a are untwisted and a gap is created between the strands 2a (FIG. 4). (b)). Then, a plurality of twisted insulated wires 6 (two in this embodiment, however, only one insulated wire 6 is shown for convenience in FIG. Then, rotate (pair twist) (toward the right). As a result, the wires 2a in the insulated wire 6 are also twisted in a predetermined direction E (rightward in this case), and the intervals between the plurality of wires 2a are narrowed again so that they are in close contact with each other (FIG. 4(c)). Note that the twisting direction A of the strands 2a may be to the left, and in such a case, the twisting direction C of the insulated wire 6 is to the right and the paired twist direction D is to the left.
  • the above-mentioned twisting and pair twisting are performed so that the twisting rate of the insulated wire 6 is less than 100%.
  • the other insulated wire 6b is covered with an insulator 4 in which a linear color band 6c of the same color as the single color is formed on a white background.
  • two colored bands 6c may be formed, one on the front side and one on the back side of the insulated wire 6b, and one color band may be formed on either the front side or the back side.
  • the twist rate of the insulated wire 6 can be defined based on this.
  • the above-mentioned untwisting rate is less than 100%, the strands 2a untwisted by untwisting are sufficiently twisted by the pair twisting, so that no gaps are created between the plurality of strands 2a after the pair twisting. , it is thought that the electrical characteristics will be improved.
  • the above-mentioned twist rate is preferably 70% or more and 90% or less, and in such a case, the electrical characteristics of the communication cable tend to be good.
  • the communication cable 1 of this embodiment includes four pairs of twisted wire pairs 8, and it is sufficient that at least one pair of twisted wire pairs 8 satisfies the above-mentioned twist ratio, preferably two or more pairs, more preferably It is preferable that three or more pairs, most preferably all four pairs, satisfy the above twist rate.
  • a stranded conductor is prepared in which a plurality of annealed copper wires (wires 2a) are twisted together at a predetermined pitch. Thereafter, the polyethylene resin is extruded from a die of an extruder while conveying the conductor 2 in the length direction, the conductor 2 is covered with the insulator 4, and the insulated wire 6 is formed. After that, while each insulated wire 6 is twisted a predetermined number of times in the opposite direction to the twisting direction of the strands 2a, a plurality of insulated wires 6 (in this case, two) are bundled together and twisted in pairs in a predetermined direction a predetermined number of times, A twisted wire pair 8 is formed.
  • twisting rate of formula (1) is derived from the twisting rotation rate of formula (2) below, and has the same technical meaning as the twisting rotation rate of formula (2). There is.
  • Retwisting rotation rate (%) (number of rotations for twisting each insulated wire 6 along direction C)/(number of rotations for pair twisting along direction D of two insulated wires 6) x 100...(2) Thereafter, a plurality of pairs (four pairs in this case) of twisted wire pairs 8 are arranged along the cross interposition 9 to form a cable core 10.
  • a high-density polyethylene tape is prepared as a winding material 20, and this tape is horizontally wound around the cable core 10.
  • an Al/PET tape is horizontally wound around the pusher 20 as the shielding tape 30.
  • the polyvinyl chloride resin is extruded from the die of the extruder, the shielding tape 30 is covered with the jacket 40, and the communication cable 1 is manufactured.
  • each twisting is performed so that the untwisting rotation rate of formula (2) is less than 100%. Adjust the number of rotations during turning and the number of rotations during pair twisting. When the twisting rotation rate is set to 70% or more and 90% or less, it becomes easy to obtain a communication cable 1 with particularly good electrical properties.
  • the twisting rotation rate is usually the same value as the twisting rate in equation (1). As described above, by setting the twisting rotation rate to less than 100%, the plurality of strands 2a can be sufficiently brought into close contact with each other by pair twisting, and the electrical properties of the resulting communication cable are improved.
  • the number of rotations in the process of untwisting each insulated wire 6 and the number of rotations in the process of twisting a plurality of insulated wires 6 in pairs are selected as appropriate depending on the type of communication cable and the type of twisted wire pairs 8.
  • the twisting rotation rate may be less than 100% when manufacturing at least one pair of twisted wire pairs 8, preferably 2 pairs or more, more preferably 3 pairs or more. Most preferably, when producing all four pairs of twisted wire pairs 8, the twisting rotation rate is preferably less than 100%.
  • the number of twisted pairs per meter of each twisted wire was approximately 130 for the blue pair, approximately 120 for the green pair, approximately 90 for the orange pair, and approximately 80 for the brown pair.
  • the untwisting rate of the formula (1) in each of the obtained twisted wire pairs was also 75%.
  • a cross interposition was prepared, and a cable core was constructed by twisting the four pairs of twisted wires along the cross interposition in the right direction.
  • the nonwoven fabric was prepared as a rolled material and wound horizontally around the cable core.
  • a shielding tape was prepared and rolled horizontally.
  • polyvinyl chloride was prepared as a resin for the outer sheath, and this was extruded from a die of an extruder to cover the shielding tape with the outer sheath to produce a communication cable with an outer diameter of about 7.5 mm.
  • the same process was repeated to form a total of four pairs of twisted wires (blue pair, green pair, orange pair, brown pair).
  • the twist pitch per meter of each twisted wire pair was about 130 for the blue pair, about 120 for the green pair, about 90 for the orange pair, and about 80 for the brown pair.
  • the untwisting rate of the formula (1) in each of the obtained twisted wire pairs was also 75%.
  • a cross interposition was prepared, and four pairs of twisted wires were twisted to the left along the cross interposition to form a cable core.
  • a high-density polyethylene tape HDPE tape
  • a shielding tape was prepared and rolled horizontally.
  • polyvinyl chloride PVC was prepared as a resin for the outer sheath, and this was extruded from a die of an extruder to cover the shielding tape with the outer sheath to produce a communication cable with an outer diameter of about 6.6 mm.
  • Sample 3-5 (comparative example) In Sample 2, the twisting direction of the strands, the untwisting direction of the insulated wire, and the pair-twisting direction were as shown in Table 1, and the untwisting rotation rate (untwisting rate) was 100%. Other than that, the communication cable was manufactured in the same manner as Sample 2.

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PCT/JP2022/019586 2022-05-06 2022-05-06 通信ケーブルおよびその製造方法 Ceased WO2023214465A1 (ja)

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PCT/JP2022/019586 WO2023214465A1 (ja) 2022-05-06 2022-05-06 通信ケーブルおよびその製造方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7698760B1 (ja) 2024-03-28 2025-06-25 冨士電線株式会社 通信ケーブル

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011049052A (ja) * 2009-08-27 2011-03-10 Tonichi Kyosan Cable Ltd シールド付き通信ケーブル

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JPS4929837Y1 (https=) * 1970-11-30 1974-08-13
JPS51604Y1 (https=) * 1970-11-30 1976-01-09
JPS51102637U (https=) * 1975-01-30 1976-08-17
JPS5866210A (ja) * 1981-10-15 1983-04-20 日立電線株式会社 複数ユニツト型通信ケ−ブルの製造方法
JP2573332Y2 (ja) * 1991-08-19 1998-05-28 昭和電線電纜株式会社 多対ケーブル
JPH08329742A (ja) * 1995-05-30 1996-12-13 Furukawa Electric Co Ltd:The ケーブル
JP4665998B2 (ja) * 2008-05-16 2011-04-06 東日京三電線株式会社 Ｌａｎ用ケーブルユニット
JP5929484B2 (ja) * 2012-05-08 2016-06-08 住友電気工業株式会社 多芯ケーブル及びその製造方法
JP5886334B2 (ja) * 2014-02-06 2016-03-16 冨士電線株式会社 Ｌａｎ用ツイストペアケーブル
JP7390913B2 (ja) * 2020-02-04 2023-12-04 タツタ電線株式会社 Ｌａｎケーブル
WO2021177275A1 (ja) * 2020-03-03 2021-09-10 昭和電線ケーブルシステム株式会社 丸型コネクタ付きケーブルおよびその製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011049052A (ja) * 2009-08-27 2011-03-10 Tonichi Kyosan Cable Ltd シールド付き通信ケーブル

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7698760B1 (ja) 2024-03-28 2025-06-25 冨士電線株式会社 通信ケーブル
JP2025152010A (ja) * 2024-03-28 2025-10-09 冨士電線株式会社 通信ケーブル

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