Method for manufacturing a mineral fiber-containing element and element produced by that method

1. A method for manufacturing a mineral fiber-containing element, said method comprising the steps of:

providing mineral fibers in an amount of 90 to 99 wt % of the total weight of starting materials in the form of a collected web,

providing a thermally curable binder in an amount of 1 to 10 wt % of the total weight of starting materials,

subjecting the collected web of fibers to a disentanglement process, suspending the fibers in a primary air flow, and

mixing the binder with the mineral fibers before, during or after the disentanglement process to form a mixture of mineral fibers and binder, collecting the mixture of mineral fibres and binder and pressing and curing the mixture to provide a consolidated composite with a density of from 120 kg/m 3 to 1000 kg/m 3 ;

wherein the mineral fibers and binder, when suspended in the primary air flow, are subjected to a further air flow in a different direction to the primary air flow;

wherein the primary air flow is generally lateral and the further air flow is generally upwards.

2. A method according to claim 1 , wherein the disentanglement process comprises feeding the web from a duct with a lower relative air flow to a duct with a higher relative air flow.

3. A method according to claim 2 wherein the speed of the higher relative air flow is from 20 m/s to 150 m/s, preferably from 30 m/s to 120 m/s, more preferably from 40 m/s to 80 m/s, most preferably from 50 m/s to 70 m/s.

4. A method according to claim 2 , wherein the disentanglement process comprises feeding the collected web to at least one roller which rotates about its longitudinal axis and has spikes protruding from its circumferential surface.

5. A method according to claim 4 , wherein the roller rotates at a rate of from 500 rpm to 5000 rpm, preferably from 1000 rpm to 4000 rpm, more preferably from 1500 rpm to 3500 rpm, most preferably from 2000 rpm to 3000 rpm.

6. A method according to claim 4 , wherein the outermost points of the spikes of the roller move at a speed of from 20 m/s to 150 m/s, preferably from 30 m/s to 120 m/s, more preferably from 40 m/s to 80 m/s, most preferably from 50 m/s to 70 m/s.

7. A method according to claim 1 , wherein the roller has a diameter based on the outermost points of the spikes of from 20 cm to 80 cm, preferably from 30 cm to 70 cm, more preferably from 40 cm to 60 cm and most preferably from 45 cm to 55 cm.

8. A method according to claim 1 , wherein the mineral fibers are provided in the form of an uncured web containing wet binder.

9. A method according to claim 1 , wherein the method is performed at a mineral wool production line, which feeds a primary or secondary mineral wool web into the fiber disentanglement process.

10. A method according to claim 1 , wherein the primary air flow has an initial speed of from 20 m/s to 150 m/s, preferably from 30 m/s to 120 m/s, more preferably from 40 m/s to 80 m/s, most preferably from 50 m/s to 70 m/s.

11. A method according to claim 1 wherein the further air flow has a speed of from 1 to 20 m/s, preferably from 1 to 13 m/s, more preferably from 2 to 9 m/s, most preferably from 3 to 7 m/s.

12. A method according to claim 1 , wherein the binder is provided in dry form.

13. A method according to claim 1 , wherein the binder is provided in wet form.

14. A method according to claim 1 , wherein no organic fibres are mixed with the mineral fibers and binder.

15. A method according to claim 14 , wherein the mineral fibers and binder together make up at least 96%, preferably at least 98% and more preferably substantially all of the total weight of starting materials.

16. A method according to claim 1 , wherein the consolidated composite has a density of from 170 kg/m 3 to 1000 kg/m 3 .