複合成形体

摘要

PROBLEM TO BE SOLVED: To provide a composite molding which is suitable as a low thermal expansion composite molding.SOLUTION: A composite molding is obtained by mixing a thermoplastic resin with a bamboo-derived powder having an average aspect ratio of 5 or more in a mass ratio of 80:20 to 30:70 and then molding the mixture by extrusion or injection. The long side of the bamboo-derived powder is oriented in a melt flow direction, so that the composite molding has a thermal expansion coefficient of 30 ppm/°C or less. The ratio of the bamboo-derived powder passing through 60-mesh sieve is 95 mass% or more. As the thermoplastic resin, polyolefins are suitable and polypropylene is more suitable.