Electrical line and method for manufacturing an electrical line
An electrical line has a core and an insulating sheath that is extruded onto the core. A structured surface having a plurality of structural elements stamped into it is formed over the entire surface of the insulating sheath. The stamped structure is a microstructure, wherein the individual structural elements have a stamping depth of at most 0.15 mm.
1. An electrical line extending in a longitudinal direction, the electrical line comprising:
a core; and
an insulating sheath extruded onto said core, said insulating sheath having a structure extending in the longitudinal direction and said structure having plurality of structural elements being stamped into said insulating sheath to form a structured surface, said structured surface having a form of an imbricated surface and said structural elements each taking a form of an obliquely positioned imbricated form, wherein a plurality of obliquely positioned imbricated forms taking a form distributed in a peripheral direction.
2. The line according to claim 1 , wherein said structure is a microstructure in which individual ones of said structural elements have a stamping depth of less than 0.15 mm.
3. The line according to claim 1 , wherein:
said structure extends over an entire surface of said insulating sheath; and
said structural elements are formed such that they are repeated periodically in the longitudinal direction.
4. The line according to claim 1 , wherein said structural elements have hollows, and said hollows cover at least 30% of said structured surface.
5. The line according to claim 1 , wherein said structural elements have an extent in at least one of the longitudinal direction or a peripheral direction of at most 0.5 mm.
6. The line according to claim 1 , wherein said insulating sheath is made of an insulating material being polyurethane.
7. The line according to claim 1 , wherein said insulating sheath is a wire sheath of a wire.
8. The line according to claim 1 , wherein said structure is a microstructure in which individual ones of said structural elements have a stamping depth of less than 0.07 mm.
9. The line according to claim 1 , wherein said structural elements have hollows, and said hollows cover at least 50% of a surface of said structured surface.
10. The line according to claim 1 , wherein said structural elements have an extent in at least one of the longitudinal direction or a peripheral direction of at most 0.3 mm.
11. The line according to claim 1 , wherein said structural elements are spaced from one another in at least one of the longitudinal direction or a peripheral direction by at most 0.5 mm.
12. A method for manufacturing an electrical line extending in a longitudinal direction, which comprises the steps of:
providing a core;
extruding an insulating sheath onto said core; and
stamping a structured surface having a plurality of structural elements into the insulating sheath still being soft downstream of an extrusion of the insulating sheath, the structured surface having a form of an imbricated surface and the structural elements each taking a form of an obliquely positioned imbricated form, wherein a plurality of obliquely positioned imbricated forms taking a form distributed in a peripheral direction.
13. The method according to claim 12 , which further comprises forming the structured surface by at least one stamping wheel.
14. The method according to claim 12 , which further comprises disposing, downstream of an extrusion head, a cooling bath through which the core is guided, and the stamping of the structural elements takes place in the cooling bath.
15. The method according to claim 12 , which further comprises forming the structured surface by a plurality of stamping wheels that are disposed offset from one another around a periphery of the insulating sheath.