Multilayered molten resin mass, multilayered preform for blow molding formed from the multilayered molten resin mass by compression molding, and multilayered container

摘要

It is an object of the invention to obtain a multilayered molten resin mass capable of providing a multilayered compression-molded product in which the layers of the multilayered compression-molded product are distributed uniformly in the circumferential direction with the intermediate resin layer positioned entirely within the inner and outer resin layers. In multilayered molten resin mass (1) for forming the multilayered compression-molded product, interlayer resin (3) is embedded eccentrically towards the bottom within inner/outer resin (2) making up the inner and outer layers, and the shape of the interlayer resin (3) is controlled within the multilayered molten resin mass so as to achieve a concave shape, with the distance t from the lower end of the interlayer resin (3) to the lower end of the multilayered molten resin mass (1) being 10% or less of the entire length of the multilayered molten resin mass, and with y (length of umbrella part of interlayer resin) 2 L (length of central part of interlayer resin) and 1 > d o (maximum outer diameter of interlayer resin in direction of circumference)/D (outer diameter of multilayered molten resin mass in direction of circumference) ‰¥ 0.5.