Composite Railroad Tie and Method of Manufacturing Same

摘要

Lightweight composite structural articles having a shell and core comprising a specially-formulated resin, and methods of manufacturing the same. In particular embodiments, the present invention relates to a composite railroad tie comprising an outer fiber-reinforced polymer shell and a unique core formed from a thermoexpandable resin mixture with microcapsules, which railroad tie is manufactured by extruding or pultruding the shell and core through a specially adapted die having a graded cavity, allowing for controlled expansion of the core as the shell and core are passed through the die.

主权项

1. A method of manufacturing a composite structural form, the method comprising:
providing a shell comprising a first resin composition; disposing a second resin composition with a different composition than the first resin composition in a cavity of the shell to provide a core; and passing the shell and the core through a die to prepare a composite structural form.