Methods for producing continuous composite sandwich structures by pultrusion

The present relates to a composite sandwich structure comprising a central core made of pultruded lightweight yarns and outer composite skin of pultruded reinforcement fiber rovings. It is provided amethod of producing a composite sandwich structure comprising providing pultruded lightweight and co-impregnated yarns, and a co-pultruded reinforcement fiber rovings; and guiding the pultruded lightweight yarns to form a central core and the pultruded reinforcement fiber rovings forming an outer composite skin within at least one heated pultrusion die producing a composite sandwich structure. 本发明涉及种复合夹层结构，其包括由拉挤成型轻质纱线制成的中心核心和拉挤成型增强纤维粗纱的外部复合表皮。提供种生产复合夹层结构的方法，其包括提供拉挤成型的轻质和共浸渍的纱线，以及共拉挤成型的增强纤维粗纱；并且在至少个加热的拉挤成型模具内，引导拉挤成型的轻质纱线以形成中心核心，并且拉挤成型的增强纤维粗纱形成外部复合表皮，从而产生复合夹层结构。