WO2002037508A1 - Fil isolant comportant une couche isolante de fibre fluororesinique - Google Patents

Fil isolant comportant une couche isolante de fibre fluororesinique Download PDF

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Publication number
WO2002037508A1
WO2002037508A1 PCT/JP2001/009132 JP0109132W WO0237508A1 WO 2002037508 A1 WO2002037508 A1 WO 2002037508A1 JP 0109132 W JP0109132 W JP 0109132W WO 0237508 A1 WO0237508 A1 WO 0237508A1
Authority
WO
WIPO (PCT)
Prior art keywords
fiber
insulated wire
tetrafluoroethylene
polytetrafluoroethylene
layer
Prior art date
Application number
PCT/JP2001/009132
Other languages
English (en)
Japanese (ja)
Inventor
Katsutoshi Yamamoto
Jun Asano
Hiroyuki Yoshimoto
Original Assignee
Daikin Industries, 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 Daikin Industries, Ltd. filed Critical Daikin Industries, Ltd.
Publication of WO2002037508A1 publication Critical patent/WO2002037508A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0233—Cables with a predominant gas dielectric
    • 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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834—Construction of the insulation between the conductors

Definitions

  • the present invention relates to an insulated wire provided with an insulating layer having a dielectric property, particularly a low dielectric constant and a low dielectric loss.
  • the insulated wire of the present invention is useful as a communication insulated cable for high-frequency transmission / reception such as a coaxial cable.
  • PTFE polytetrafluoroethylene
  • a method of winding a PTFE tape around the center conductor to form an insulating layer, making PTFE powder into a paste with an extrusion aid, and applying this paste around the center conductor There is known a method in which an insulating layer is formed by extruding a resin and firing it.
  • the method of winding a PTFE tape has a problem that the wrapping part of the tape is difficult to bend (it is difficult to follow the core wire) at the time of use.
  • the insulating property and the dielectric properties are deteriorated, and there is also a problem that the length is limited due to the batch system.
  • An object of the present invention is to provide an insulated wire having an insulating layer, particularly an insulated cable for high-frequency communication, which makes use of the excellent dielectric properties of PTFE as it is and reduces the production cost. Disclosure of the invention
  • the present invention has a linear conductor at the center and a PTF
  • the present invention relates to an insulated wire having a fiber insulating layer containing-.
  • FIG. 1 is a schematic plan view of one embodiment of the insulated wire of the present invention.
  • FIG. 2 is a sectional view taken along line XX of FIG.
  • FIG. 3 is a schematic plan view of another embodiment of the present invention.
  • FIG. 4 is a schematic sectional view of another embodiment of the present invention.
  • FIG. 5 is a schematic plan view of one embodiment of the coaxial cable of the present invention.
  • FIG. 6 is a schematic sectional view of one embodiment of the insulating cable of the present invention.
  • FIG. 7 is a schematic sectional view of another embodiment of the insulating cable of the present invention.
  • BEST MODE FOR CARRYING OUT THE INVENTION The feature of the present invention is that a fiber insulating layer including PTFE staple fiber is used as an insulating layer on the outer periphery of a center conductor of an insulated wire which can be suitably used as a communication cable such as a coaxial cable. On the point.
  • FIG. 1 Schematic plan view
  • reference numeral 1 denotes an insulated wire
  • a fiber insulating layer 3 is provided on an outer periphery of a center conductor 2.
  • Fig. 2 shows a cross-sectional view along the line X-X.
  • the fiber insulating layer 3 may be composed of only a PTFE staple fiber, or a mixed fiber insulation of PTFE staple fiber and one or more kinds of other stable fibers. It may consist of layers.
  • PTFE stable fiber it is advantageous to use only PTFE stable fiber, especially when importance is placed on dielectric properties.
  • P Processing is easier than when TFE staple fiber is used alone, and when heat-fusible resin fiber is used, a PTFE stable fiber can be fixed and the layer structure of the fiber insulation layer is stabilized. can do.
  • This mixed fiber insulation layer is preferably heat-treated at a temperature lower than the melting point of PTFE.
  • the staple fiber used is preferably a branched staple fiber.
  • the branch By having the branch, the entanglement between the fibers becomes tighter and tighter, so that it is possible to avoid using a binder that can be an impurity.
  • unbranched fibers obtained by emulsion spinning contain carbonaceous residues caused by the fiber sizing agent, and may degrade the electrical insulation and dielectric properties.
  • the PTFE staple fiber is preferably a semi-sintered stable fiber of PTFE having the most excellent dielectric properties (dielectric loss tangent and dielectric loss).
  • the branched PTFE staple fiber can be produced by a method described in Japanese Patent Application Laid-Open No. 9-19327. That is, a method of uniaxially stretching a fluororesin film, splitting the film in the stretching direction to form a net-like (mesh) shape, cutting the mesh, and then cutting the film to an appropriate length.
  • the obtained stable fiber has very high entanglement because it has branches.
  • the PTFE may be a single polymer of tetrafluoroethylene, or PTFE (modified PTFE) modified with fluorovinyl ether, hexafluoropropylene, trifluoroethylene, or the like. Is also good.
  • the PTFE staple fiber preferably has a fiber length of 5 to 50 mm and a fiber diameter of about 0.5 to 20 m, which is suitable for the core spun processing method described later.
  • a mixed fiber insulating layer polyethylene, polypropylene, ethylene-tetrafluoroethylene copolymer (FEP) and tetrafluoroethylene-perfluoro ( Stable fibers of at least one resin selected from the group consisting of (alkyl vinyl ether) copolymer (PFA) are preferred.
  • FEP ethylene-tetrafluoroethylene copolymer
  • Stable fibers of at least one resin selected from the group consisting of (alkyl vinyl ether) copolymer (PFA) are preferred.
  • Polyethylene or polypropylene, particularly polyethylene is preferred from the viewpoint of excellent dielectric properties and thermal fusibility, and fluororesins, particularly ETFE and FEP, are preferred from the viewpoint of excellent heat resistance.
  • a copper wire, a silver wire, or the like, or a silver plated copper wire, a nickel-plated copper wire, or the like is generally used as the center conductor 2.
  • the fiber insulating layer 3 As a method of providing the fiber insulating layer 3 on the outer periphery of the center conductor 2, for example, PT FE staple fino—single or a mixture with other staple fibers is slivered, and this is wound into a winding machine such as a core spun spinning machine. And wound around the center conductor (core spanning method).
  • the thickness of the fiber insulating layer 3 is 0.1 to 10 g Zm, preferably 0.2 to 5 g / m in coating amount.
  • the fiber insulating layer 3 is a mixed fiber insulating layer
  • the heating method include oven heating.
  • the heating temperature may be a temperature equal to or lower than the melting point of PTFE, and preferably varies depending on the type and amount of other staple fibers constituting the fiber layer. Adopt it.
  • the heating time is usually 0.1 to 5 minutes.
  • Fig. 3 (schematic plan view)
  • polyethylene, polypropylene, PTFE, ETFE, FEP It is preferable to perform a finishing step of winding at least one filament or yarn 4 of a resin selected from the group consisting of PFA and PFA.
  • the outer periphery of the fiber insulation layer 3 was selected from the group consisting of polyethylene, polypropylene, ETFE, FEP, and PFA. It is preferable to provide an insulating continuous resin coating layer 5 of at least one kind of resin. By forming the insulating continuous resin coating layer 5 into a porous continuous layer by foaming with a foaming agent or the like, the dielectric characteristics can be further improved.
  • the thickness of the insulating continuous resin coating layer is usually about 50 to 2000.
  • the insulated wire of the present invention can be formed into a coaxial cable 7 by providing a shield layer 6 made of a metal mesh on the outer periphery of the fiber insulating layer 3. Further, the shield layer 6 may be provided on the outer periphery of the resin insulation continuous coating layer 5 (not shown).
  • the present invention also relates to an insulated cable 9 in which a plurality of insulated wires 1 are bundled and the space between the insulated wires 1 is filled with an insulating resin 8 as shown in schematic sectional views in FIGS.
  • the arrangement of the insulated wires 1 is not particularly limited, and may be an annular structure as shown in FIG. 6 or a parallel structure as shown in FIG.
  • the space between the insulated wires 1 is filled with an insulating resin such as polyethylene or polypropylene.
  • the insulated wire of the present invention has excellent dielectric properties (low dielectric constant and low dielectric loss) as well as electrical insulation properties, and is useful as a communication cable for performing high-frequency communication, particularly as a basic unit of a coaxial cable.
  • An unfired PTFE film was prepared from PTFE fine powder by a conventional method, and heat-treated for 45 seconds in a salt bath heated to 337 t: to obtain a semi-fired PTFE film, which was uniaxially stretched 25 times at 350 ° C.
  • This uniaxially stretched film was defibrated with a needle blade roll at a rotation speed of 4500 rpm and a film feed speed of 1.5 mZ to produce a cotton-like material of semi-baked PTFE stable fiber having branches and loops.
  • the fiber length of the obtained semi-fired PTFE staple fiber was approximately between 1 and L 00 mm, the specific surface area was 3.3 m 2 Zg, and the average fiber diameter was 10 m.
  • the dielectric constant of the semi-fired PTFE film which is the raw material, is 2.1 (measured by a network analyzer manufactured by Hewlett-Packard), and the dielectric loss tangent (measured by a network analyzer manufactured by Hewlett-Packard) is 1 It was 1 X 10—4.
  • a web having a width of 10 cm and a basis weight of 25 g / m (basis weight 250 g / m 2 ) was produced from the obtained cotton-like material of the PTFE stable fiber.
  • the web prepared above was used as a sliver, and the core was spun with a core-spun spinning machine (manufactured by Feila Co., Ltd.) around a silver plated copper wire (diameter 0.2 mm) with a coating amount of 0.8 g Zm. A recording layer was formed.
  • the outer diameter (outer diameter of the fiber coating layer) was about lmm (measured with a dial gage having an applied load of 25 g at 10 points obtained by dividing the 1 mm length into ten equal parts).
  • the porosity of the fiber insulating layer when the true specific gravity of PTFE was set to 2.15 from the measured outer diameter was about 55%.
  • an insulated wire useful as a communication insulated cable for high-frequency transmission and reception such as a coaxial cable having an insulating layer having a dielectric property, particularly a low dielectric constant and a low dielectric loss.

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  • Communication Cables (AREA)
  • Insulated Conductors (AREA)

Abstract

L'invention concerne un fil isolant s'utilisant comme câble isolant de communication pour l'émission/réception haute fréquence, tel qu'un câble coaxial ayant une couche isolante aux caractéristiques diélectriques, en particulier une faible constante diélectrique et des pertes diélectriques réduites. L'âme du câble est un conducteur linéaire et sa périphérie extérieure présente une couche isolante fibreuse contenant des fibres stables de polytétrafluoroéthylène.
PCT/JP2001/009132 2000-11-01 2001-10-18 Fil isolant comportant une couche isolante de fibre fluororesinique WO2002037508A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000334612A JP2002140936A (ja) 2000-11-01 2000-11-01 フッ素樹脂繊維絶縁層を有する絶縁線
JP2000-334612 2000-11-01

Publications (1)

Publication Number Publication Date
WO2002037508A1 true WO2002037508A1 (fr) 2002-05-10

Family

ID=18810495

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/009132 WO2002037508A1 (fr) 2000-11-01 2001-10-18 Fil isolant comportant une couche isolante de fibre fluororesinique

Country Status (2)

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JP (1) JP2002140936A (fr)
WO (1) WO2002037508A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103247368A (zh) * 2012-02-03 2013-08-14 富士康(昆山)电脑接插件有限公司 发泡线材

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05258615A (ja) * 1992-03-09 1993-10-08 Junkosha Co Ltd 絶縁電線及びその製造方法
WO1996000807A1 (fr) * 1994-06-30 1996-01-11 Daikin Industries, Ltd. Fibre longue et fil fendu gonflants de polytetrafluoroethylene et leurs procedes de fabrication, procede de fabrication d'une substance cotonneuse a base de cette fibre et de ce fil, et tamis de filtre arretant la poussiere
WO1996010662A1 (fr) * 1994-10-04 1996-04-11 Daikin Industries, Ltd. Fibre de polytetrafluoroethylene, article analogue au coton obtenu de cette fibre et son procede de production
WO1996010668A1 (fr) * 1994-10-04 1996-04-11 Daikin Industries, Ltd. Matiere melangee similaire au coton, non tisse obtenu a partir de cette derniere et leur procede de fabrication
JPH08124428A (ja) * 1994-10-21 1996-05-17 Kurabe Ind Co Ltd 面状絶縁導体
JPH11200139A (ja) * 1998-01-20 1999-07-27 Daikin Ind Ltd 熱溶融性フッ素樹脂繊維
JPH11297126A (ja) * 1998-04-10 1999-10-29 Hitachi Cable Ltd オーディオ機器用ケーブル
JP2001357730A (ja) * 2000-06-15 2001-12-26 Daikin Ind Ltd 高周波信号伝送用製品およびその製法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05258615A (ja) * 1992-03-09 1993-10-08 Junkosha Co Ltd 絶縁電線及びその製造方法
WO1996000807A1 (fr) * 1994-06-30 1996-01-11 Daikin Industries, Ltd. Fibre longue et fil fendu gonflants de polytetrafluoroethylene et leurs procedes de fabrication, procede de fabrication d'une substance cotonneuse a base de cette fibre et de ce fil, et tamis de filtre arretant la poussiere
WO1996010662A1 (fr) * 1994-10-04 1996-04-11 Daikin Industries, Ltd. Fibre de polytetrafluoroethylene, article analogue au coton obtenu de cette fibre et son procede de production
WO1996010668A1 (fr) * 1994-10-04 1996-04-11 Daikin Industries, Ltd. Matiere melangee similaire au coton, non tisse obtenu a partir de cette derniere et leur procede de fabrication
JPH08124428A (ja) * 1994-10-21 1996-05-17 Kurabe Ind Co Ltd 面状絶縁導体
JPH11200139A (ja) * 1998-01-20 1999-07-27 Daikin Ind Ltd 熱溶融性フッ素樹脂繊維
JPH11297126A (ja) * 1998-04-10 1999-10-29 Hitachi Cable Ltd オーディオ機器用ケーブル
JP2001357730A (ja) * 2000-06-15 2001-12-26 Daikin Ind Ltd 高周波信号伝送用製品およびその製法

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DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase