PURPOSE: To obtain a light panel board which is excellent in rigidity, heat insulation, noise absorption, and thermal moisture resistance and can be deeply drawable, by a method wherein a polyol component and an isocyanate component are discharged on a moisture nonpermeable film by making the isocyanate component react excessively under a presence of water and an organic foaming agent, a nonwoven fabric is pressed and then, this laminated material is brought into contact with water to be heated.
CONSTITUTION: When a polyol component is made to react on an isocyanate component under a presence of either or both of water and organic foaming agent of monochloro trichloromethane or the like, they are made to react under a state in which the isocyanate component exists more excessively than a reaction equivalent and foam is generated. When it is used as a foam raw material and foaming and moulding are successively in a panel form performed on double conveyors, a moisture non-permeable film 2 is laid on the conveyor, and a cream 3, stirring mixing liquid, is made to flow uniformly from above the conveyor traversing it to be moulded into a continuous block form of a low foaming height. Further at a time when some tack remains on an upper surface of this block, a continuous panel board of a controlled thickness of which both surfaces are covered by the moisture non- permeable film and the nonwoven fabric can be moulded by compressing above-mentioned continuous block on the conveyor via the nonwoven fabric 6.
FUKUDA HIROYA
OHASHI TAKASHI
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