| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermoplastic resin foamed molded product excellent in cushioning properties and shock absorbing properties and also excellent in rigidity in a bending direction. SOLUTION: The thermoplastic resin foamed molded product contains at least three layers, that is, a skin layer, a low foamed layer and a highly foamed layer in this order, and the skin layer, the low foamed layer and the highly foamed layer substantially comprise the same thermoplastic resin. The void ratio of the skin layer is below 1%, that of the low foamed layer is 1-below 40% and that of the highly foamed layer is 40% or above. The ratio (Da1/Da2) of the diameter (Da1) in the thickness direction of air bubbles present in the highly foamed layer in the vicinity of the low foamed layer to the diameter (Da2) in the direction vertical to the thickness direction is 1-4 and the ratio (Db1/Db2) of the diameter (Db1) in the thickness direction of air bubbles in the vicinity of the center in the thickness direction of the highly foamed layer to the diameter (Db2) in the direction vertical to the thickness direction is >4 but≤10. COPYRIGHT: (C)2005,JPO&NCIPI |
