Purac Biochem Bv

Rosendahl Nextrom Gmbh

Nextrom Oy

Photonium Oy

Rosendahl Nextrom Oy

Risto Widerholm

Ali Harlin

Fredrik Ollila

Tiina Nypelö

Esa Huttunen

Erik Vedel

Urmas Jöksi

Leena Hupa

Olli Raki

Jukka Nummela

Joonas Ilmarinen

Tatu Kutvonen

A sealing arrangement for a drawing furnace including a vertical center hole with surrounding heating elements for receiving a glass preform including a tapered portion connected to an extension rod. A sealing with an opening is arranged on top of the furnace. The arrangement includes an outer annular bushing arranged on top of the furnace and an inner annular bushing with a first and an opposing second vertical end. The inner bushing is positionable to surround at least part of the tapered portion with the first end positioned to the region of the beginning of the tapered portion and the second end includes protrusions on the outer surface. As the inner bushing is inserted in the outer bushing it is arranged to be movable within the outer bushing and the protrusions form supports for holding the second end of the inner bushing above the center hole.

Sealing arrangement of a drawing furnace

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.

Sealing apparatus having a plurality of sealing elements arranged around a center opening into a ring configuration

The present invention relates to a system for manufacturing fibres comprising a melting furnace, a crucible within said furnace comprising at least one orifice () and at least one induction coil () for heating the melting furnace and the crucible. In a typical system according to the invention, the crucible comprises at least a first part () made of graphite and comprising said at least one orifice (). The invention also relates to the use of the system as well as to a method for manufacturing fibres and to said fibres.

System and method for manufacturing fibres

Growing community of inventors

Espoo, Finland

Risto Widerholm