A laminated panel for acoustic insulation

摘要

The laminated board 4 has an acoustically absorbent core material 7 and surfaces of resin-impregnated fibre material 5, 6 wherein one surface 6 is significantly less porous to sound than the other surface 5. The core may be a paper honeycomb and the surfaces may be formed of natural fibers and a sugar based bio-resin. The enhanced acoustic properties may be achieved by sequential curing of the resin in stages which differ on either side of the core and various levels of compression may be applied.