PRODUCTION OF TWO-LAYER MOLDING MADE OF THERMOPLASTIC SYNTHETIC RESIN

摘要

PURPOSE:To produce a two-layer molded form which has stable interlaminar bonding strength irrespective of superiority or inferiority of compatibility in one stage by mixing thermoplastic synthetic resin powder for an external layer having fine particle size with thermoplastic synthetic resin powder for an inner layer having coarse particle size and filling this mixture into a mold and heating this mold while performing angular displacement of the mold around two axes. CONSTITUTION:A mold 1 is arranged in a heating furnace 5 so that both angular displacement around the axes 2a, 2b and angular displacement around the axes 4a, 4b orthogonal to these axes 2a, 2b are enabled. Thermoplastic synthetic resin powder for an inner layer having coarse particle size of at least 3 mesh and smaller than 30 mesh and thermoplastic synthetic resin powder for an external layer having fine particle size of at least 30 mesh are filled into a mold 1 in a mixed state. While heating the mold 1 by a burner 6, angular displacement is performed around two axes for the mold 1 and both synthetic resins are melted. Thereby both an external layer Mo melt-stuck on the inner face of the mold 1 and an inner layer Ml melt-stuck on the inner face of this external layer part Mo are formed to the inside of the mold 1 in a state wherein the interlaminar interfaces are mutually complicated. The twolayer molding M is obtained by cooling and solidifying both layer parts.