| 摘要 |
PROBLEM TO BE SOLVED: To provide a polystyrene based resin foamed-laminated sheet of which the brittleness is reduced, which is light-weight, and has an excellent rigidity in spite of being a sheet of a low secondary foaming magnification, and has a foaming layer which can be thermally molded. SOLUTION: For this polystyrene based resin foamed-laminated sheet, on both surfaces of the polystyrene based resin foamed layer, an impact resistant polystyrene based resin non-foamed layer is laminated by the co-extrusion method. The density is 0.15 to 0.72 g/cm<SP>3</SP>, the thickness is 0.3 to 1.7 mm, the rate of independent air bubbles is 55% or higher, and the secondary foaming magnification is 1.7 times or lower. Also, the heat shrinkage ratio satisfies the relationships by (1) equation: 1.3<the heat shrinkage rate in the extruding direction/the heat shrinkage rate in the width direction being perpendicular to the extruding direction<3.0, and (2) equation: 20%<the heat shrinkage rate in the extruding direction<55%. At the same time, the tensile fracture elongation of the impact-resistant polystyrene based resin which constitutes the non-foamed layer is from 7% to 100%. COPYRIGHT: (C)2009,JPO&INPIT
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