Patent EA-004610-B1 (EA)
Title: Method and device for forming mineral wool
Inventor: WAGNER CHRISTOPHE
IPC: D04H1/64
Filed: 2002-02-13
Abstract: 1. A device for inner centrifuging of mineral fiber, comprising a centrifuge (1), provided with peripheral band (7) perforated with orifices (14) distributed in a plurality of annular zones (ZA) arranged on top of each other with the centrifuge in centrifugation position, characterized in that it includes at least two annular zones (ZA1, ZA2) whose number of orifices per unit of surface area (NS1, NS2) differs by a value greater than or equal to 5%, in particular greater than or equal to 10%, and even 20%. 2. Device according to claim 1, characterized in that the annular zone containing the greatest number of orifices per unit of surface area is located below the other annular zone, containing the least average number of orifices per unit of surface area assuming that the centrifuge is in centrifugation position. 3. Device according to claim 1 or 2, characterized in that the orifices (14) of each annular zone are grouped in rows, with a diameter of orifice (d) substantially constant in each annular zone and decreasing from one annular zone to another, from the top to the bottom of the peripheral band of the centrifuge (7) in centrifugation position. 4. Device according to claim 3, characterized in that the rows are spaced from each other at a distance between 1 and 2 mm, in particular between 1.2 and 1.8 mm, preferably with a pitch from one row to the next of between 1 and 2 mm, for example between 1.2 and 1.6 mm. 5. Device according to one of preceding claims, characterized in that the diameter (d) of at least a part of the orifices (14) of the spinner centrifuge (1) is at most 1.5 or 1.2 mm, in particular between 1.1 and 0.5 mm, for example between 0.9 and 0.7 mm. 6. Device according to one of proceeding claims, characterized in that the distance (D) between the centers of the closest orifices neighboring the same annular zone (ZA) is substantially constant over an entire annular zone and in that this distance (D) varies from one zone to another by at least 3%, or even at least 5%, and even 10% or more, and is decreasing from the top to the bottom, with in particular a distance D between 0.8 and 3 mm, for example between 1 and 2 mm. and even between 1.4 and 1.8 mm. 7. Device according to one of proceeding claims, characterized in that the centrifuge (1) presents an average diameter (DM) less than or equal to 800 mm, in particular by at least 200 mm. 8. Device according to one of proceeding claims, characterized in that centrifuge (1) is connected with a cup (3), in which the molten glass flows. 9. Device according to one of proceeding claims, characterized in contains at least one mean of production of high temperature gaseous drawing in form of an annular burner (9). 10. Device according to claim 9 wherein the annular burner (9) is a tangential burner which includes a mechanism of giving the gaseous drawing jet a tangential component in relation to the external horizontal edge of the centrifuge. 11. Centrifuge, characterized in that the device according to any claims 1-7 is used in it. 12. Centrifuge according to claim 11, characterized in that there is no bottom. 13. Method of making of mineral fiber by inner centrifuging comprising a centrifuge (1) in combination with gas stretching out at a high temperature, in which the melt for stretching out is poured out in centrifuge (1) provided with peripheral band (7) perforated with orifices (14) distributed in a plurality of annular zones (ZA) arranged on top of each other with the centrifuge in centrifugation position, characterized in that it includes at least two annular zones (ZA1, ZA2) whose number of orifices per unit of surface area (NS1, NS2) differs by a value greater than or equal to 5%, in particular greater than or equal to 10%, and even 20%, the annular zone comprising the most average number of orifices per area unit is placed above the other annular zone, comprising the least average number of orifices for area unit, while looking the centrifuge in the position of fiberizating. 14. The use of mineral fibers, produced with the help of device according to one of claims 1-10 and/or method according to claim 13 for producing thermo-insulating and soundproof product.