| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a foamed polystyrene resin sheet which has excellent secondary expandability in the thickness direction, expands well during molding, and forms a secondary foamed molding excellent in appearance and strength. <P>SOLUTION: In the foamed polystyrene resin sheet which is obtained by extruding and expanding a polystyrene resin composition containing a polyphenylene ether resin from an extruder through a circular die, when the average number of bubbles on a straight line in the thickness direction contained in a thickness portion of 300 μm from at least one side is 5 or below, and the thickness of the foamed sheet is tmm, the average (X) of the sizes in the extrusion direction of bubbles in a range of 2t/5-3t/5 mm from the surface of the sheet, the average (Y) of the sizes in the width direction perpendicular to the extrusion direction, and the average (Z) of the sizes in the thickness direction satisfy formulas (1) and (2): 1.05≤X/Z≤1.5 (1) and 1.5≤Y/Z (2). <P>COPYRIGHT: (C)2012,JPO&INPIT |
