Abstract:
In a method and apparatus for manufacturing an optical fiber cable, a metal band is gradually shaped into a lengthwise slotted tube, the optical fibers are introduced into the still open slotted tube, the lengthwise slot of the tube is welded and the outside diameter of the welded tube is reduced. The welded tube with the reduced outside diameter is wound at least once around a take-up reel. A force provided on the reduced outside diameter welded tube as it is wound on the take-up reel causes an elastic strain of 0.1 to 0.6% on the tube. The strain is released on the take-up reel to produce an overlength of the optical fibers relative to the reduced outside diameter welded tube.
Abstract:
In a method and apparatus for manufacturing an optical fiber cable, a metal band is gradually shaped into a lengthwise slotted tube, the optical fibers are introduced into the still open slotted tube, the lengthwise slot of the tube is welded and the outside diameter of the welded tube is reduced. The welded tube with the reduced outside diameter is wound at least once around a take-up reel. A force provided on the reduced outside diameter welded tube as it is wound on the take-up reel causes an elastic strain of 0.1 to 0.6% on the tube. The strain is released on the take-up reel to produce an overlength of the optical fibers relative to the reduced outside diameter welded tube.
Abstract:
In a method for producing lengthwise welded metal tubes, a metal tape is drawn from a supply reel and is gradually formed into a slotted tube, and the slotted tube is welded by a laser beam, the tape edges are heated by a separate laser beam. The laser beams for the heating and welding strike the lengthwise seam at an angle that is less than 15.degree. from the vertical, the distance between the burn spots produced by the laser beams is between 1 and 5 mm, and the power applied to the tape edges by the first laser beam is sufficient to raise the temperature of the tape edges to at least one half of the T.sub.F -T.sub.R difference, where T.sub.F is the fusing temperature of the metal and T.sub.R is the room temperature.
Abstract:
In a method for producing a lengthwise welded metal tube with an outside diameter of 1 to 6 mm, whereby a metal band is shaped into a lengthwise slotted tube by a forming tool, and the lengthwise slot of the tube is welded by a laser welding installation, the tube to be welded passes immediately before and immediately after the welding point area through a guide that guides the surface of the tube to keep the edges of the band in contact with each other and keeps the welded seam stress-free. The jaws of a clamping tool grip the welded tube immediately downstream of the guide to keep it from twisting.
Abstract:
A ribbon cable (1) having optical waveguides (2) which are laminated between two ribbons (3, 4). The ribbons (3, 4) have an adhesive layer on one side. They are bonded to the optical waveguides (2) and to each other between them as well as at the edges. The ribbons (3, 4) have the same coefficient of thermal expansion as the optical waveguides (2), they preferably consist of fiberglass-reinforced plastic.
Abstract:
Copper-clad steel wire is produced by forming a copper tube around the wire, and drawing down the copper tube and wire to reduce the cross-section of the wire by at least 30%. The wire is annealed, slowly cooled and the cross-section further reduced by at least 10%.
Abstract:
There is disclosed a process and apparatus for manufacturing flexible, shielded coaxial cable exhibiting improved magnetical screening capabilities wherein a tubular outer conductor is concentrically formed about an inner conductor with spacer means being disposed in the annulus between conductors. Accordingly, about the inner conductor including spacer means therefore, there is formed an inner component tube of a conductive material by the continuous forming in a lengthwise direction of a metal band into a tube having longitudinal edges welded together in a continuous, longitudinal welded joint. Concurrently, at least one further component tube is formed concentrically about the inner component tube by the lengthwise deformation of a second metal band of a ferromagnetic material into a second tube having opposed longitudinal edges which are also welded in a longitudinal direction in a continuous, longitudinal welded joint.
Abstract:
A temperature-resistant electrical line comprises at least one central electrical conductor, an insulation, which is made from a mineral material and surrounds the electrical conductor completely, and a metallic outer tube, which bears against the insulation. The outer tube (3) has, over its entire length, a helical notch (4), which is open to the outside, and which is produced once the line is finished by means of a metal-removing tool and whose depth is at least 50% of the wall thickness of the outer tube (3), with a residual wall thickness (5) which ensures the stability thereof.
Abstract:
A method of operating an electrical heating arrangement of considerable length using a heating line having at least one heating conductor surrounded by an insulation resistant to high temperatures. A metal tube (4) abutting against the insulation (3) is formed around the heating line (1) and the heating line (1), which is equipped with the metal tube (4) is inserted into a metallic tube (5) which has a diameter larger than the metal tube (4) and encloses, in addition to the heating line (1), an axially continuous clearance space (6). A non-combustible gas having a lower kinematic viscosity compared with air is inserted into the clearance space (6), the gas completely filling the latter and being kept permanently under pressure.
Abstract:
A process for producing an aluminum coated metallic material comprises drawing an aluminum band having a significantly larger inside diameter than cross sectional diameter of the material concurrently with the material so as to form an open seam tube around the elongated metallic material. The seam of the open tube is welded so as to close the seam. An atmosphere or protective gas or reducing gas is maintained in an annular gap between the elongated metallic material and the aluminum tube. The diameter of the aluminum tube is drawn so as to reduce it by at least 20%. It is then drawn down a second time so as to coat the elongated metallic material. Finally, the cross section of the aluminum coated metallic material is reduced by at least 10%.