| 摘要 |
PROBLEM TO BE SOLVED: To provide a core of a mattress that is lightweight, elastic, has a good ventilating property and an insulating property, and is foldable. SOLUTION: The core 1a of a mattress is formed of soft foamed polyurethane in a rectangular flat plate form. Conical protrusions 2, 2, etc., the tips of which are rounded, are provided on the surface and the reverse in a lattice form by profiling, the protrusions 2, 2, etc., are symmetrically positioned on both surface and reverse sides. |
