C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/8.1
C03B 37/06 (2006.01)
Patent
CA 1273205
Abstract Apparatus for producing mineral fibres from silicate raw materials, in particular basalt having a modular modulus of viscosity of at least 1.4, by blast drawing To produce basalt wool having a large fibre dia- meter of if desired 10 µm 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 fiberisation therein and to utilise the subsequent long vertical length (vL) of the nozzle slot (10) in full for fiber drawing without thereby incurring marked bead formation.
504107
Fachat Gaston
Sistermann Klaus
Ungerer Heinz-Jurgen
Grunzweig & Hartmann Aktiengesellschaft
Sim & Mcburney
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