| 摘要 |
Expanded styrene resin beads are made of a styrene resin as the base resin and have an average bead diameter of 0.5-10 mm and an apparent density of 0.013-0.15 g/cm3. The expanded beads are characterized in that the expanded beads each has many dimples having a maximum diameter of 5-100μm in the surface and that when the expanded beads are secondarily expanded under the conditions of a heating steam temperature of 107° C. and a heating time of 120 seconds, then the secondary expansion ratio determined by dividing the apparent density of the expanded beads before the secondary expansion (g/cm3) by the apparent density of the expanded beads after the secondary expansion (g/cm3) satisfies the relationship (1). Secondary expansion ratio≰−7.00×{apparent density of expanded beads before secondary expansion (g/cm3)}+1.61 (1).
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