| abstract |
(57) [Summary] [Object] To provide a method for rationally producing an expandable web suitable as an intermediate material for producing a novel lightweight composite molded article having good mechanical properties with respect to weight. [Structure] Particles that can be expanded or expanded by heating are formed on a water-permeable nonwoven fabric or woven cloth, and the particles are fixed by gluing, fusing or the like to obtain a foamed / heat-expandable web. When this is heat-molded together with a resin, a lightweight composite molded article having a porous core can be manufactured, and when it is molded together with a skin material, a reinforcing fiber cloth, etc., a FRP sandwich material can be manufactured. |