Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Formation of fiber or preform utilizing fluid blast
Patent
1993-05-05
1994-10-18
Lindsay, Robert L.
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
Formation of fiber or preform utilizing fluid blast
65518, C03B 3705
Patent
active
053564502
DESCRIPTION:
BRIEF SUMMARY
It is known to make mineral wool fibres from a mineral melt using an apparatus comprising
a housing having a front face,
a set of fiberising rotors each mounted on the front face for rotation about a different substantially horizontal axis and arranged such that when the rotors are rotating melt poured on to the periphery of the top rotor in the set is thrown on to the periphery of the subsequent rotor, or on to the periphery of each subsequent rotor in sequence, in the set and mineral wool fibres are thrown off the or each subsequent rotor, and
means for collecting the mineral wool fibres comprising, associated with the or each said subsequent rotor, an air supply slot extending through the front face of the housing around and close to the periphery of that rotor for discharging an air blast close to and substantially parallel to the periphery with an axial component for carrying the mineral wool fibres axially off that periphery, and
direction means for selecting the angle of the discharged air relative to the axial direction.
Apparatus of this general type is described in GB 1,559,117. In particular that describes one system in which the air direction means are blades on the periphery of the rotor and that rotate with the rotor and thus give a tangential component to the air supply that is the same as the rotational speed of the rotor. That patent does, however, also describe that the direction means can be blades mounted in the slot and that this makes it possible to vary the flow of air and its direction along the periphery of the rotor. Thus, instead of the tangential velocity of the air being dictated by the rotational speed of the rotor, it can be dictated by the choice of the angle at which the blades are set. Instead of the flow of air being uniform around the entire rotor, the slot can be closed or reduced in some areas so as to reduce the flow of air in those areas. In particular, it is possible to close the flow of air in the interspace between the rotors where the melt flows from one rotor to the next, so as to reduce the disturbing and cooling effect on the flow of melt. The inference therefore is that the slot containing the blades should extend around most at least of the remainder of the periphery of each of the rotors. As a consequence, the slots will extend between lower adjacent parts of the lowermost pair of rotors.
When manufacturing mineral wool fibres binder is usually sprayed into the fibres as they are carried axially away from the set of rotors, and it is desirable to obtain the best possible distribution of binder with the fibres.
Some shot or coarse fibre is normally thrown off the set of rotors and can be collected in a pit positioned beneath and slightly in front of the set of rotors, just before a conveyor or other suitable carrier for removing the mineral wool from the chamber containing the rotors. The shot and coarse fibres are collected in the pit and recycled to the melt. It is naturally desirable to minimise the amount of good quality fibres that are collected in the pit.
According to the invention apparatus for the production of mineral wool is provided which comprises a housing having a front face, a set of rotors each mounted on the front face of the housing for rotation about a different substantially horizontal axis and arranged such that when the rotors are rotating mineral melt that is poured on to the periphery of the top rotor in the set is thrown on to the periphery of the subsequent rotor, or each subsequent rotor in sequence, in the set and mineral wool fibres are thrown off the or each susequent rotor, means for collecting the mineral wool fibres comprising, associated with the or each subsequent rotor, an air supply slot extending through the front face of the housing around and close to that rotor for discharging an air blast close to and substantially parallel to the periphery of the rotor with an axial component for carrying the mineral wool fibres axially off that periphery, and direction means for selecting the angle of the discharged air relative t
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Friis Rasmussen Bruno
Grove-Rasmussen Svend
Lindsay Robert L.
Rockwool International A/S
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