Bockningsbar filt av material av fibrer med slumpartad riktning

摘要

To permit the curvature of felts of crimped mineral wool fibres, ie. those in which the orientation of the fibres, instead of being parallel to a plane, is quasi-random, in a temporary or permanent manner, they are provided on the convex side with a surfacing sheet, the rupture resistance of which is greater than 300 kPa such as, for example, a kraft paper of a surface mass which is greater than 60 g/m<2>.