Signal transmission cable, multicore cable, and method of manufacturing signal transmission cable

A signal transmission cable comprising,

• a signal line;
• an insulation layer configured to cover the signal line;
• and
• a plating layer configured to cover the insulation layer,
• wherein an arithmetic average roughness Ra of an outer peripheral surface of the insulation layer is between 0.6 μm and 10 μm inclusive;
• wherein the insulation layer is made of polyethylene,
• wherein the polyethylene has crystal structures of the triclinic crystal system or of the orthorhombic system, or has a coexisting state of at least one of these crystal structures,
• wherein the polyethylene has preferential crystalline orientations in specific two or less number of crystal axes,
• wherein a (100) crystal orientation degree O100 of the polyethylene expressed in the following Formula 2 is 0.26 or less, and
• O
• 100
• =
• I
• 200
• I
• 110
• +
• I
• 200
• [
• Formula
• ⁢
• ⁢
• 2
• ]
• wherein I200 in the Formula 2 is X-ray diffraction intensity of the index 200, and I110 is X-ray diffraction intensity of the index 110.

The signal transmission cable comprising,

• a signal line;
• an insulation layer configured to cover the signal line;
• and
• a plating layer configured to cover the insulation layer,
• wherein an arithmetic average roughness Ra of an outer peripheral surface of the insulation layer is between 0.6 μm and 10 μm inclusive
• wherein the insulation layer is made of polyethylene or perfluoroethylene-propene copolymer,
• wherein when the insulation layer is made of the polyethylene, the polyethylene has a crystalline size of 18 nm or greater in a crystalline component, and
• wherein when the insulation layer is made of the perfluoroethylene-propene copolymer, the perfluoroethylene-propene copolymer has a crystalline size of 13.6 nm or less in a crystalline component.