PURPOSE: To prevent the occurrence of uneven thickness in a molding by specifying the value of an average maximum thickness to an average minimum thickness that are obtained by measuring the thickness of a foam sheet along its width direction.
CONSTITUTION: The value of the average maximum thickness to an average minimum thickness obtained by measuring the thickness of a foam sheet along its width direction Is made 0.9 or more. The basement resin is of the type that has long chain branches in its main chain. The propylene resin is made 60m/min. or below in the draw-down properties, and it is preferable that the seal-crystalization time in a crstalization temperature of +15°C is 800sec. or more. In the case of using a tray-like vessel, e.g. a plate-like vessel having accommodation parts 2, 3 at both sides of a partition, or a vessel in which seal-spherical accommodation parts 5 are horizontally aligned in four rows and the positions of the accommodation parts 5 are aligned in upper and lower five rows to be shifted by half between the upper and lower rows, the drawing ratio in each accommodation part 3 is made 0.56. Thus, there never occurs any unevenness of thickness in a molding obtained.
KINO TORU
MORITA KAZUHIKO
AOKI TAKESHI
