Abstract: The invention pertains to a composite panel comprising a foamed thermoplastic core layer which is joined on both sides without adhesive to thermoplastic outer layers reinforced by fiberglass mats. The composite panel is used to make molded parts for motor vehicles.

Abstract: A process and device are disclosed for producing glass fiber mat reinforced thermoplastic boards, as well as their advantageous use. Glass fiber mats are impregnated with molten thermoplastics and the composite glass fiber mat is then pressed. At least one of the glass fiber mats runs through the aperture of an impregnation nozzle controllably supplied with molten thermoplastics by extruders, forming two streams of molten mass that are applied at the outlet of the nozzle aperture on the top and on the bottom of the glass mats, pre-impregnating the glass fiber mat. These glass fiber mats thus pre-impregnated with thermoplastics runs through a gap between feeding rollers of a double belt press, are pre-calibrated then pressed by cooling plates into glass fiber mat reinforced thermoplastic board.