Abstract: The invention relates to a device for processing optical fibers, comprising: a pair of pulleys (1, 2) arranged to receive in a space between them a first optical fiber element (4), and a drive mechanism. In order to obtain a device capable of efficiently and reliably processing optical fibers the first pulley (1) in the pair of pulleys comprises a circumferential first groove (5) in a circumferential contact surface (6) for receiving the first optical fiber element (4), the first groove (5) being shaped to accommodate the first optical fiber element (4) such that less than half of the cross sectional surface area of the first optical fiber element (4) protrudes out of the first groove (5), and a second pulley (2) in the pair of pulleys comprises a circumferential contact surface (7) contacting a surface of the first optical fiber element (4).

Abstract: The invention relates to an apparatus. In order to achieve efficient sealing, the apparatus includes a sealing with a plurality of sealing elements arranged generally in a ring configuration around a center opening. Each sealing element includes a sealing surface facing the center opening. At least one chamber is included for receiving sections of the sealing elements. An inlet to a fluid source provides the at least one chamber with fluid in order to generate an overpressure acting on the sections of the sealing elements received in the at least one chamber, and for pressing and moving the sealing surfaces of the sealing elements towards the center opening.

Abstract: The invention relates to a method and an arrangement in a coating line, in which a fibre (2) is uncoiled from a fibre start (1) by means of a pulling device (5) to an extrusion head (3) that comprises a die part (7) and a torpedo part, by means of which on the surface of a primary coated fibre there is arranged a buffer layer which is in tight contact with the primary coated fibre, and in which method the tightly coated fibre is cooled downstream of the extrusion head (3) in a predetermined manner. First there is determined a target value for line tension by means of the correlation between a line tension and a force required for stripping a buffer layer and the line tension between the extrusion head (3) and the pulling device (5) is measured.

Abstract: A method and an apparatus for coating a fiber bundle, the fiber bundle comprising at least three fibers and the method comprising guiding the fiber bundle to travel through a first and a second chamber formed by means of a first, a second and a third nozzle part of a nozzle means, whereby coating material is fed to the fiber bundle through the chambers. The fibers of the fiber bundle are kept separate from each other in the first nozzle part, so that the coating material gets to penetrate between the fibers in the first chamber; the fibers are guided into a position against each other in the second nozzle part, so that the coating material surrounds the uniform fiber bundle in the second chamber; and the fiber bundle is guided onwards through the third nozzle part to provide the final fiber bundle diameter.

Abstract: The invention relates to a method and an arrangement in a coating line, in which a fibre (2) is uncoiled from a fibre start (1) by means of a pulling device (5) to an extrusion head (3) that comprises a die part (7) and a torpedo part, by means of which on the surface of a primary coated fibre there is arranged a buffer layer which is in tight contact with the primary coated fibre, and in which method the tightly coated fibre is cooled downstream of the extrusion head (3) in a predetermined manner First there is determined a target value for line tension by means of the correlation between a line tension and a force required for stripping a buffer layer and the line tension between the extrusion head (3) and the pulling device (5) is measured.

Abstract: A method and an arrangement in a coating line for a fibre-like product or fibre-like products, in which the fibre-like product is directed from output means to a press head, by means of which a tube is formed around the fibre-like product. The fibre-like product is directed from the coating line to a feed unit in a preparatory position at the side. When the coating process of a previous product has terminated, the feed unit is shifted to the coating line and the fibre-like product is fed into the press head and is accelerated to the speed of the tube by means of the feed unit. The feed unit is detached from the fibre-like product, when measurement parameters associated with the fibre-like product and/or the tube reach the predetermined values and is shifted back to the preparatory position at the side of the coating line.

Abstract: An outside chemical vapor deposition apparatus is disclosed for depositing porous glass-forming material onto a target rod to form a cylindrical body, with substantially higher efficiency than could prior apparatus. The apparatus includes two separate burner arrays, one array optimized for depositing the material during an initial stage of the process, when the cylindrical body has a relatively small diameter, and the other array optimized for depositing the material during a later stage of the process, when the cylindrical body has a relatively large diameter. In addition, each burner array can include a plurality of burners, with each burner azimuthally angled relative to the apparatus' air-flow axis, and with adjacent burners angled in opposite directions relative to that axis, to minimize the density gradient within the deposited porous material.

Abstract: A method and an arrangement in connection with a production line for optic cable, wherein optical fibers (1) are guided to a coating point (3), where filling gel is applied around the fibres, and a loose tubular casing is formed around the fibres and the filling gel. The fibres (1) are guided to the coating point through a device (4) that is formed from three parts (4a, 4b, 4c), said device being supported on a first base (5) and on a second base (6) moving in the travel direction of the fibres. Sensors (7, 8) are arranged in the first and second bases (5, 6) for measuring the force acting on the bases (5, 6). The arrangement further comprises means (9) for calculating the difference between said measured values for determining the friction force between the fibres and the tubular device (4).