Sumitomo Electric Industries, Limited

Sumitomo Electric Fine Polymer, Inc.

Ryota Fukumoto

Satoshi Yamasaki

Shinya Nishikawa

Fumiaki Sato

Taro Fujita

Yohei Suzuki

Yasutaka Emoto

Nayu Yanagawa

Yuuki Yabe

Takanori Yamazaki

Hiroshi Hayami

Yoshiyuki Inoue

Masakazu Takami

Kenta Tsuchiya

Shuhei Yasuda

Yoitsu Sekiguchi

Yuuki Shimoda

Kuushin Ryan

Toyoaki Kimura

Ryohei Fujita

Shoshi Katakai

An optical cable according to an embodiment of the present disclosure is an optical cable for installation in a microduct, the optical cable including one or more optical-fiber core wires, and a sheath layer covering an outer peripheral side of the one or more optical-fiber core wires. The sheath layer has a density of 2.0 g/cmor less. The sheath layer contains an olefin-based resin, a silicone, and a non-halogen flame retardant. A mass ratio of the non-halogen flame retardant to the olefin-based resin is 0.90 to 2.00. A mass ratio of the silicone to the olefin-based resin is 0.005 to 0.100. The olefin-based resin contains a polyethylene, and an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer. The silicone has a weight-average molecular weight of 50,000 to 1,000,000.

Optical cable

An optical fiber cable includes a plurality of optical fibers, a tensile strength member set that is disposed along the plurality of optical fibers in a longitudinal direction of the optical fiber cable, and a sheath that covers the plurality of optical fibers from outside and encloses the tensile strength member set in the sheath. In the optical fiber cable, at least four tensile strength member sets are embedded in the sheath in a state where the four tensile strength member sets are apart from each other in a radial direction of the optical fiber cable, the sheath includes a flame-retardant inorganic substance and a release agent, and a distance from one of the four tensile strength member sets to a surface layer of the sheath is 0.5 mm or more.

Optical fiber cable

An optical fiber cable includes a plurality of intermittently connected optical fiber ribbons inside a cable sheath, in which a fibrous filler or an FRP using the fibrous filler is provided on at least one pair of diagonals of the two diagonal directions approximately orthogonal to each other inside the cable sheath. An average linear expansion coefficient of the fibrous filler at &#x2212;40&#xb0; C. to +70&#xb0; C. is smaller than an average linear expansion coefficient of the cable sheath at &#x2212;40&#xb0; C. to +70&#xb0; C.

A tubular cable interconnect unit arranged on an outer periphery of a joint of a power cable, includes a tubular insulating tube, a non-ohmic resistor layer formed from a non-ohmic composition and provided on an inner peripheral surface of the insulating tube, and an inner semiconductive layer provided on the non-ohmic resistor layer, wherein the non-ohmic composition includes a base polymer including at least one of thermoplastic and rubber, and varistor grains having a non-ohmic characteristic in which a volume resistivity varies non-linearly with respect to an applied voltage, and the varistor grains have a maximum grain diameter of 30 &#x3bc;m or less.

Non-ohmic composition and method for manufacturing same, cable interconnect unit and cable end-connect unit

A heat-shrinkable tube or heat-shrinkable cap includes an adhesive layer disposed on the inner surface thereof, the adhesive layer including a low-viscosity adhesive layer formed of a resin having a viscosity of 10 Pa&#xb7;s or less at a shear rate of 1 sat the heat shrinkage temperature and a viscosity of 100 Pa&#xb7;s or more at a shear rate of 1 sat the maximum continuous use temperature. The heat-shrinkable tube or heat-shrinkable cap is used for waterproofing an exposed portion of electrical wires of an electrical wire bundle such as a wire harness, in which merely by placing the heat-shrinkable tube or heat-shrinkable cap over the exposed portion of electrical wires, waterproofing and water blocking between strands can be achieved, and outflow of the resin during heat shrinking does not occur. A method of waterproofing an electrical wire bundle uses the heat-shrinkable tube or heat-shrinkable cap.

Heat-shrinkable tube, heat-shrinkable cap, and method of waterproofing electrical wire bundle

A heat-recoverable component includes a tube-shaped or cap-shaped base material layer having heat shrinkability, and an adhesive layer formed on an inner circumferential surface of the base material layer. The adhesive layer includes a low-viscosity adhesive portion and a high-viscosity adhesive portion disposed between the low-viscosity adhesive portion and an opening of the base material layer. The low-viscosity adhesive portion has a shear viscosity of 10 Pa&#xb7;s or less at a shear rate of 1 sat a heat shrinkage temperature of the base material layer. The high-viscosity adhesive portion has a shear viscosity of 100 Pa&#xb7;s or more at a shear rate of 1 sat the heat shrinkage temperature of the base material layer. At the heat shrinkage temperature, a ratio of the shear viscosity of the high-viscosity adhesive portion to the shear viscosity of the low-viscosity adhesive portion is 15,000 or less.

Heat-recoverable component, electrical wire bundle, and insulated electrical wire-covering method

It is an object of the present invention to provide a heat-recoverable article which heat-shrinks in an appropriate temperature range, in which the occurrence of bloom and bleeding is small, and which has excellent resistance to copper-induced damage; and a wire splice and a wire harness each including the heat-recoverable article. A heat-recoverable article according to the present invention has a cylindrical shape and includes a base material layer, in which the base material layer contains an antioxidant and two or more polyolefin resins, the base material layer has one melting-point peak temperature, the melting-point peak temperature is 112&#xb0; C. to 128&#xb0; C., the heat of fusion of all of the resin components of the base material layer is 80 to 130 J/g, and the oxidation induction temperature of the base material layer is 265&#xb0; C. to 280&#xb0; C.

Heat-recoverable article, wire splice, and wire harness

An object of the present invention is to provide a multilayered heat-recoverable article in which an adhesive layer easily flows during heat shrinkage to ensure adhesiveness with an adherend and does not flow out from a base material layer after heat shrinkage, and a wire splice and a wire harness that include a tube formed by thermally shrinking such a multilayered heat-recoverable article. The multilayered heat-recoverable article () according to the present invention includes a cylindrical base material layer (), and an adhesive layer () formed on an inner circumferential surface of the base material layer. The adhesive layer () is formed of a resin composition that contains a polyamide as a main component and that does not substantially contain an inorganic filler. The resin composition is cross-linked by irradiation with ionizing radiation. A shear viscosity of the adhesive layer () at 150&#xb0; C. is 300 Pa&#xb7;s or more at a shear rate of 0.01 sand 200 Pa&#xb7;s or less at a shear rate of 100 s. The wire splice and the wire harness according to the present invention includes a tube formed by thermally shrinking the multilayered heat-recoverable article ().

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Osaka, Japan

Ryota Fukumoto