| 摘要 |
PROBLEM TO BE SOLVED: To provide a reinforcement material which suppresses dimensional change of a foamed body, and can have both of bending strength and machinability compared with a conventional plywood board which is used as a reinforcement material that is used so as to come in contact with a foamed body.SOLUTION: A stacked body 5 comprises: a core layer 3; barrier layers 1a and 1b arranged on both surfaces of the core layer 3; and intermediate layers 2a and 2b arranged between the core layer 3 and the barrier layers 1a and 1b respectively. The core layer 3 has a density of 0.30 g/cmor more and 0.80 g/cmor less, and a thickness of 0.50 mm or more and 2.00 mm or less. The barrier layers 1a and 1b have a moisture vapor transmission rate of 5.0 g/m24 h or less. The intermediate layers 2a and 2b have a density of 0.80 g/cmor more, a Young's modulus in at least one direction out of a MD vertical direction and a parallel direction of 2,800 MPa or more, an average Young's modulus of the MD vertical direction and the MD parallel direction of 4,000 MPa or more, and a moisture vapor transmission rate of 10.0 g/m24 h or less. The whole of the stacked body 5 has a moisture vapor transmission rate of 2.0 g/m24 h or less and a thickness of 1.15 mm or more. |
