Apparatus for the production of fine mineral fibres

US4676815A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wolfram Wagner · Dormagen, DE
• Peter-Roger Nyssen · Dormagen, DE
• Gunter Espanion · Cologne, DE
• Dirk Berkenhaus · Cologne, DE
• Gunter Haladuda · Burscheid, DE
• Hans-Theo van Pey · Bedburg, DE
• Karl Schott · Nuremberg, DE

Key dates

• Filing date: Apr 3, 1986
• Grant date: Jun 30, 1987
• Expiry date: Apr 3, 2006

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D01D5/14
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Filaments of a molten material issue from a plurality of openings in a heated melt crucible and are further fiberized in a draw nozzle by means of a blowing medium. The diameter of the outlet openings (3) at the base of the melt crucible (1) is very small and is 0.2 to 1.5 mm, so that very fine primary filaments (12) are already formed at this point. These primary filaments are grasped by a very turbulent current at the entrance of the draw nozzle (5). The transverse component of the current decreasing in favor of the longitudinal component as the axial distance from the outlet openings (3) increases. The draw nozzle also has an inlet portion, which has a sharp outer edge and widens in the direction of flow, so that air blows against the primary filaments at a high speed and they are exposed to a strong pressure gradient in the longitudinal direction before entering the inlet portion. In the draw nozzle the primary filaments which are themselves already very thin are drawn out further until they have the required final diameter. For this purpose a zone is provided in the interior of the nozzle, following the inlet portion, in which zone the rate of flow of the blowing medium is 400…