The present invention provides means for improving bondability between a vehicle seat core and a cushion in a vehicle seat pad formed by integration of them without significantly impairing mechanical properties. A vehicle seat core is characterized in that it is a vehicle seat core for forming a vehicle seat pad by integration with a cushion, which comprises a foamed resin molded body obtained by filling a cavity of a mold with a plurality of foamed resin particles and performing in-mold foam molding, and that at least a partial region of a surface of the foamed resin molded body to which the cushion is bonded when forming the vehicle seat pad has a surface expansion rate of 40% to 85%, and the foamed resin molded body has a first fusion rate of 95% or more or a second fusion rate of 60% or more.

The present invention provides means for improving bondability between a vehicle seat core and a cushion in a vehicle seat pad formed by integration of them without significantly impairing mechanical properties. A vehicle seat core is characterized in that it is a vehicle seat core for forming a vehicle seat pad by integration with a cushion, which comprises a foamed resin molded body obtained by filling a cavity of a mold with a plurality of foamed resin particles and performing in-mold foam molding, and that at least a partial region of a surface of the foamed resin molded body to which the cushion is bonded when forming the vehicle seat pad has a surface expansion rate of 40% to 85%, and the foamed resin molded body has a first fusion rate of 95% or more or a second fusion rate of 60% or more.

A method of manufacturing a multicolor-foamed shoe body by supercritical foaming includes step S1 to step S3: step S1: provide a plurality of cold shot model molds and inject a plurality of foaming materials in different colors into a cavity of each of the cold shot model molds to form a plurality of cold shot models in different colors that is unfoamed; step S2: place the cold shot models in a hot-pressing mold for hot pressing to make a contacting surface of any two of the cold shot models that are adjacent engage with each other due to heating to foam a semi-finished product; and step S3: place the semi-finished product in a supercritical foaming autoclave for foam molding to obtain the multicolor-foamed shoe body. Additionally, the multicolor-foamed shoe body manufactured by the method is also disclosed in the present invention.

A composite part manufactured via a dual cast slush molding technique includes a skin layer having a first side and an opposite second side and a foam layer formed in situ on the second side of the skin layer. The first side of the skin layer defines a Class A surface. The skin layer and the foam layer each comprise a polymer of the same type and are respectively formed from a first resin-based composition and a second resin-based composition. The first resin-based composition and the second resin-based composition each may comprise a polyvinyl chloride (PVC)-based composition or a thermoplastic polyolefin (TPO)-based composition.