An overmolded seat back structure having a connecting surface for supporting a support panel and a process for forming a seat back structure via an overmolding process.

A manufacturing method and structure for a composite material racket frame includes the following steps: (a) Resin impregnation: Impregnate a composite material with resin; (b) Wrapping the core mold with composite material: Use a core mold in the shape of a racket, made of polymethacrylimide (PMI) or expanded polypropylene (EPP) material; then wrap the composite material around the core mold to form a composite material layer. The mutually wrapped composite material layers and core mold together form a semi-finished product; (c) Heating and pressurizing: Place the semi-finished product into a mold with a cavity, and heat the mold to a preset temperature. After heating, the core mold expands due to heat, forming internal pressure within the semi-finished product; (d) Cooling and curing: Stop heating and allow the semi-finished product to cool until it reaches a cured state, and (e) Finished product formation: Remove a finished racket frame from the mold.