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1. (WO1992010602) METHOD OF MANUFACTURING INSULATING BOARDS COMPOSED OF INTERCONNECTED ROD-SHAPED MINERAL FIBRE ELEMENTS
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Pate n t c l a i m s

1. A method of manufacturing insulating board elements 'composed of interconnected rod-shaped mineral fibre elements comprising converting a melt of a mineral fibre forming starting material into fibres, supplying a binder to said fibres, causing the fibres to form a fibre web, cutting the fibre web in the longitudinal direction to form lamellae, cutting said lamellae into desired lengths, turning the lamellae 90" about their longitudinal axis and bonding them together to form boards, c h a r a c t e r i z ed in using lamellae which have been subjected to a surface compression followed by a longitudinal compression either before or after the fibre web is cut into lamellae.

2. A method according to claim 1, c h a r a c t e r i z e d in using lamellae made from a doubled fibre web.

3. A method according to claims 1 or 2, c h a r a ct e r i ze d in using lamellae which have been compressed longitudinally in a ratio of from 1.5:1 to 4:1.

4. A method according to claims 1, 2 or 3, c h a r a c t e r i zed in using lamellae which have been subjected to a surface compression in a ratio of from 3:1 to 6:1.

5. A method according to any of the claims 1-4, c h a ract er i zed in that the fibre web is cut into lamellae having desired lengths before being turned 90" and combined into lamella boards.

6. A method according to any of the claims 1-5 and comprising supplying to the fibres a heat curable binder, c h a r a c t e r i z ed in that the surface compression and the longitudinal compression are effected before the fibre web is subjected to a heat treatment to cure the binder.