| 摘要 |
PURPOSE:To improve impact resistance, bending strength of a molding by a method wherein a resin component is injected into a molding frame arranged so that the widest face of the molding takes the vertical direction and continues to be heated until the resin does not harden but the contained foams are defoamed. CONSTITUTION:Filler, pigment and heating hardener are mixed with unsaturated polyester resin to prepare resin compound. This compound is injected into the molding frame arranged so that the widest face of the molding takes the vertical direction and the resin continues to be heated until the resin compound substantially does not continue to harden but contained foams substantially are defoamed. Then, the resin compound is heated up to the setting temperature and hardened to obtain the molding. From the viewpoint of strength, iso- or para-unsaturated polyester is suitable for the unsaturated polyester. Alumina, calcium carbonate, clay, etc. are suitable for the filler. |
