Abstract: A polypropylene-based composite resin composition in which: (1) a complex viscosity ?* at 190° C. and an angular frequency (?) of 0.1 rad/s is 2000 Pa·s or more, (2) shear storage moduli G?100, G?10, G?0.1, and G?0.01 at 190° C. and angular frequencies (?) of 100, 10, 0.1 and 0.01 rad/s satisfy an equation (I) and an equation (II): log(G?100)?log(G?10)?0.6??(I) log(G?0.1)?log(G?0.01)?0.4??(II) and (3) a shear storage modulus G?0.0251 at 190° C. and an angular frequency of 0.0251 rad/s is 60 Pa or more. The polypropylene-based composite resin composition reveals less liability to cause failures such as short shot, burrs, surface formation failure, deformation and stringing even when a molding cycle in injection molding is shortened.

Abstract: A method of producing a laminated structural molding formed from molded resin and an outer layer of facing material. The method comprises the step of initially placing the facing material in a mold. Molten resin is injected into the mold. The resin is spread throughout the mold by locating mold sections adjacent each other at a set compressive force. The partially assembled molding is then subjected to a cooling process in which the compressive force to which the molding is exposed is reduced so that the force is greater than zero but less than the compressive force used to spread the resin. The mold sections do not retract or move during the reduction in the compressive force. The cooling process is performed just before or after the completion of the spreading of the resin. In this way, the damage to the facing material of the molding is kept to a minimum.

Abstract: A die for injection molding for charging molten resin onto a surface material set on the cavity surface is disclosed. The die comprises direction changing means for changing the direction of flow of the molten resin charged through the gate to directions along the surface of the surface material. The direction changing means may be a substantially conical direction changing member for changing the direction of flow of the molten resin. Since the direction changing means can change the direction of flow of the molten resin charged into the die, which is completely closed or slightly open, to directions along the surface of the surface material, the molten resin does not strike the surface material. Thus, damage to the surface material in the neighborhood of the gate can be prevented, and the surface material can be protected against the collision with molten resin which is at a high temperature and under a high pressure.

Abstract: A polyolefin composition is disclosed, which comprises a polyolefin and an inorganic filler, wherein the polyolefin composition comprising (A) 75 to 97% by weight of a polyolefin component comprising (a) 90-65 parts by weight of a polymer composition comprising a crystalline polypropylene component and an ethylene-propylene random copolymer component and having an ethylene content of 7% by weight or less and/or a propylene homopolymer and (b) 10 to 35 parts by weight of a polyethylene having a melt index of not lower than 10 g/10 min., said melt index being from 1.0 to 50 times that of the polymer (a), and (B) 25 to 3% by weight of a fibrous inorganic filler having an average fiber diameter of 0.1 to 0.8 micrometer and an aspect ratio of 20 to 60.The polyolefin composition is capable of providing, upon molding, articles having good surface appearance, in particular glossiness and improved mechanical strengths with less warping and deformation.