Apparatus for producing mineral fibres from molten silicate by b

Details Apparatus for producing mineral fibres from molten silicate by b Apparatus for producing mineral fibres from molten silicate by b

1986-03-13

1987-10-06

Lindsay, Robert L.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 5, 65 19, C03B 3706

Patent

active

046980865

ABSTRACT:
To produce basalt wool having a large fibre diameter of if desired 10 .mu.m with high output and low bead formation, the exit cross-section of the exit orifices (6) of the distributor tank (5), the vertical distance (vA) between the exit orifices (6) and the blow-in slits (29) for propellant gas, the horizontal width (hB) of the nozzle slot (10) and the vertical length (vL) of the nozzle slot (10) downstream of the blow-in slits (29) are dimensioned to be unusually large for an apparatus for producing rock fibres by blast drawing. As a result, it is possible to operate at a low melt temperature and a high propellant gas rate combined with a low propellant gas pressure in order, surprisingly, to obtain a coarse-fibered product with low bead formation and high output. In the area of the blow-in slits (29) the airguide lips (28) advantageously form an abruptly terminated slot constriction in order to assist the fiberization therein and to utilize the subsequent long vertical length (vL) of the nozzle slot (10) in full for fiber drawing without thereby incurring marked bead formation.

REFERENCES:
patent: 3352653 (1967-11-01), Speth
patent: 3547610 (1970-12-01), Holman
patent: 4487622 (1984-12-01), Battigelli et al.
patent: 4539029 (1985-09-01), Muschelknautz et al.
patent: 4553996 (1985-11-01), Muschelknautz et al.

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