Foamed electric wire, communication cable, and method of manufacturing the same
AssigneeYazaki Corporation
InventorsKosuke Tashiro, Maki Yamada
Life of this patent
Estimating the term…
Abstract
A foamed electric wire includes a conductor, and a covering layer that covers the conductor and is constituted by one or more layers. At least one layer of the covering layer is a foamed covering layer made of a resin composition containing a polypropylene resin, that is formed by foam extrusion molding. An average foam diameter of the foamed covering layer is 30 μm or less in a cross-sectional direction, and 60 μm or less in a longitudinal direction. A foaming ratio of the foamed covering layer is 25% or more and 55% or less. An arithmetic average height of a surface of the foamed electric wire is 20 μm or less.
Claims5
A foamed electric wire comprising:
- a conductor;
- and
- a covering layer that covers the conductor and is constituted by one or more layers, wherein
- at least one layer of the covering layer is a foamed covering layer made of a resin composition containing a polypropylene resin, that is formed by foam extrusion molding,
- an average foam diameter of the foamed covering layer is 30 μm or less in a cross-sectional direction, and 60 μm or less in a longitudinal direction,
- a foaming ratio of the foamed covering layer is 25% or more and 55% or less, and
- an arithmetic average height of a surface is 20 μm or less.
A method of manufacturing a foamed electric wire comprising:
- a step of forming a covering layer that covers a conductor and is constituted by one or more layers;
- and
- a step of forming a foamed covering layer made of a resin composition containing a polypropylene resin, that is formed by foam extrusion molding, as at least one layer of the covering layer, wherein
- an average foam diameter of the foamed covering layer is 30 μm or less in a cross-sectional direction, and 60 μm or less in a longitudinal direction,
- a foaming ratio of the foamed covering layer is 25% or more and 55% or less, and
- an arithmetic average height of a surface of the foamed electric wire is 20 μm or less.
Dependencies are inferred from the claim text.