| 摘要 |
PROBLEM TO BE SOLVED: To provide a polystyrene-based extruded foam plate which is obtained by a laminating method, is excellent in thickness accuracy, and is excellent in heat insulation performance.SOLUTION: There is provided a polystyrene-based extruded foam plate which is obtained by melting an inner surface of a polystyrene-based resin foam extruded into a cylindrical shape from a cyclic die and has a thickness of 5-20 mm and an apparent total density of 0.02-0.07 g/cm, where the polystyrene-based extruded foam plate contains 0.3-15 pts.mass of a radiation suppression agent with respect to 100 pts.mass of a polystyrene-based resin, has apparent density of the surface layer part of 0.15-0.35 g/cm, has a ratio of the apparent density of the surface layer part to the apparent total density of the foam plate of 2.5 or more, has an average bubble diameter in a thickness direction of 60-200 μm, and a ratio of the average bubble diameter in a thickness direction of the surface layer part to the average bubble diameter in the thickness direction of the foam plate of 0.4-1.SELECTED DRAWING: Figure 1 |
