PURPOSE: To provide a resin foam sheet and a molding method having adequate satisfaction in its rigidity and cushioning property even in the case being used in a large-sized vessel.
CONSTITUTION: An original foamed sheet 1 subjected to a primary foaming process is heated, and the molding gap t2 is set twice or more as larger as the thickness t0 of the original foamed sheet 1 to subsequently be held by a pair of molds 2, 3 heated to a temperature or higher being lower by 10°C than the softening temperature of the original foam sheet 1. The original foam sheet 1 is vacuum sucked alternately or at the same time from the side of each mold 2, 3 for subjecting the original foamed sheet to a secondary foaming process and forming a high-order foamed sheet 5. Thus, molding a foamed resin sheet having the cell configuration dimensions longer in its wall thickness direction (Z direction) than in its width direction (X direction) and flowing direction (Y direction).
HATTORI KAZUHIDE
KAWAMURA YOSHINORI
MITSUBISHI CHEM BASF CO LTD