Insulating element, method and device for manufacturing insulating material and rollable mat of mineral fibres

摘要

In the production of a sealing element (especially a rollable sealing sheet) of mineral fibers, having properties varying over its height and/or breadth, by supplying the fibers to a conveyor together with a binder then hardening the binder, the binder content and/or the amount of fiber supplied is varied to provide regions of elevated binder content in the sheet. Independent claims are included for: (a) a sealing element as above, consisting of parallelipedal sheets with top and bottom faces of large surface area and side and end faces of lower surface area, where at least one area between the top and bottom faces has an elevated binder content of up to 15 (preferably 2-10, especially 2.0-2.5) wt. %; and (b) apparatus for producing the element as in (a), including a furnace for melting a silicate material, a silicate microfiber producing device compreising rotating roller(s) onto which the melt is applied and a conveyor on which the fibers are combined with binder, where nozzles are are provided in the fiber aggregation region to supply different types and/or amounts of binder locally to the fiber aggregates or an oscillating device is provided to apply increased doses of binder to specific regions.