| 摘要 |
<p>A method of making a composite board having a front and a back in a mould (10,12) includes the steps of: (a) applying a layer of a first composition (14,16) comprising a thermosetting resin and a catalyst for the thermosetting resin, to the surface of the mould (10,12); (b) allowing the thermosetting resin to polymerize to form the front of the composite board; (c) applying a layer of a connecting composition (24) comprising an adhesive or a second composition comprising a thermosetting resin and a catalyst for the thermosetting resin, to the inner surface of the front of the composite board in the mould; (d) placing a structure comprising one or more laminae (28), each lamina comprising first and second sheets of a natural fibre material and a corrugated sheet or a cellular core of a natural fibre material sandwiched between the first and second sheets, the lamina having been impregnated with a third composition comprising a thermosetting resin, an extending liquid for the thermosetting resin and a catalyst for the thermosetting resin, the thermosetting resin having been polymerized, on the connecting layer of step (c); and (e) allowing the connecting composition to set to join the structure to the front of the composite board to form the composite board, and removing the composite board from the mould. In another embodiment of the method, a layer of a fibrous reinforcing material (18) wetted with a fourth composition comprising a thermosetting resin and a catalyst for this thermosetting resin may be interposed between the layer of the first composition (14,16) and the structure (28), using a layer of a connecting composition (24), to join the various layers together. The method produces a composite board which may be used as a door or as a building board. <IMAGE></p> |
