Method for producing expanded polypropylene resin particles, expanded polypropylene resin particles and in-mold expanded molded article

摘要

Provided is a method for producing expanded polypropylene resin particles that can be used as a material for an in-mold expanded molded product which maintains inherent strength of a base resin despite a high expansion ratio. The method for producing expanded polypropylene resin particles according to the present invention is characterized by producing first-step expanded particles which have a low percentage of wrinkle-induced shrinkage as low as 5% or less, from polypropylene resin particles made of a polypropylene resin composition containing a specific polyethylene resin.