| 摘要 |
<p>PURPOSE:To make it possible to obtain continuously a laminated sheet without warpage and waviness by controlling a degree of curing of a liq. resin when a liq. resin-impregnated base material is presses, heated and cured by means of a double belting press. CONSTITUTION:A base material in continuous length is performed by an impregnation and drying treatment using a treating agent such as methylolmelamine before it is impregnated with a thermosetting resin fluid. Then, a partial impregnation is performed on the base material in continuous length by using thermosetting resin which is liq. at ordinary temp. such as an unsatd. polyester resin etc. A plurality of the base materials in continuous lengths impregnated with a curable resin fluid are laminated to make a laminated substance, which is then heat-pressed by means of a double belting press with a uniform pressure over the whole range of a pressing region to obtain a laminated sheet while the impregnated resin spreads into voids of the base materials as wide as possible and completes impregnation. In addition, it is necessary that the resin fluid is semi-cured in such a way that when the laminated body is released from the double belting press to release pressure, the laminated body does not recover in the thickness direction caused by an elastic restoring force of the compressed base material and endures continuous transfer in the next heating process with no pressure.</p> |
