Foamed sheet and method for producting the same

摘要

The present invention provides a foamed sheet showing small dimensional changes resulted with temperature changes, etc., said foamed sheet which made of a thermoplastic resin material, wherein the coefficient of linear expansion of the thermoplastic resin material alpha (/°C.) and the coefficient of linear expansion of the foamed sheet alphaf (/°C.) satisfy the following expression (1): |alphaf/alpha|<=½ (1)and the like.