Abstract: A method of producing a sandwich panel core of mineral wool fibers from a cured mineral fiber product includes the steps of providing a cured mineral fiber product with a dual density having a top layer with mineral fibers with a first density and a base layer having mineral fibers with a second density, the second density is at least two times lower than said first density. The top layer and the base layer have different fiber orientations. Further steps including cutting the mineral fiber product into a plurality of lamellae, rotating the lamellae 90 degrees, and re-joining the lamellae so that the top layers with the first density are vertically oriented.

Abstract: A method of producing a sandwich panel core of mineral wool fibres from a cured mineral fibre product includes the steps of providing a cured mineral fibre product with a dual density having a top layer with mineral fibres with a first density and a base layer having mineral fibres with a second density, the second density is at least two times lower than said first density. The top layer and the base layer have different fibre orientations. Further steps including cutting the mineral fibre product into a plurality of lamellae, rotating the lamellae 90 degrees, and re-joining the lamellae so that the top layers with the first density are vertically oriented.

Abstract: The invention concerns a device for indicating the tensioning of a fastening member, such as a screw or the like, said device comprising a first portion with a first fastening member receiving aperture; a second portion with a second fastening member receiving aperture in alignment with said first fastening member receiving aperture, and a joining portion connecting said first and second sheet portions allowing the first and second portions are biased towards each other by the head of the fastening member in response to the tightening of said fastening member, wherein the device is provided with irreversible indicator means for indicating that the tension in the elongated fastener during the mounting process has been exposed to a tension exceeded a predetermined tension value, and wherein said irreversible indicator means comprises that said first portion is provided with a distal end portion adapted for sliding and locking engagement with corresponding indicator means provided on the second portion, and that