Facility for generating fibers, in particular mineral fibers, from a molten mass

US4961695A · kind A · utility

Assignee

• Grunzweig & Hartmann AG · DE

Inventors

• Clemens Hirschmann · Ilvesheim, DE
• Heinz-Jurgen Ungerer · Viernheim, DE
• Joachim Mellem · Schriesheim, DE

Key dates

• Filing date: Feb 28, 1989
• Grant date: Oct 9, 1990
• Expiry date: Feb 28, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P40/57
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

In an unraveling facility according to the blast drawing process a subsonic diffuser (11) is arranged following the blast pipe (6). The subsonic diffuser (11) is designed as a thrust diffuser with a sudden cross-sectional widening of its flow border in order to form several stages (13, 14, 15). In this way, a larger median expansion angle (.alpha.) can be chosen without risking detrimental detachment of the main flow than is possible with subsonic diffusers having a continuous flow border. Furthermore, the whirls formed under setoff levels prevent the fiber parts from coming into direct contact with the walls, so that a considerably reduced bead content results in combination with the strong flow expansion and ensuing reduction of mutual contact and penetration of fiber parts. The diameter distribution of the fibers is smoothed out, since speed distribution, which exhibits strong border stress when it emerges from the drawing gap (8), is smoothed out quicker due to the energy consumed by the whirls. By systematically introducing additional blasting medium in the area of the subsonic diffuser (11), the flow can be systematically influenced in order to meet all the requirements posed…