Multi-layer thermoformable laminates and methods of their manufacture

A multi-layer laminated structure having been made by a process comprising the steps of:

• forming a polymer layer of an at least partially molten polymeric material having opposite sides and having a thickness of from about 3 to about 60 mils;
• superposing first and second layers of glass cloth material, each having a thickness of from about 1 to about 20 mils, in confronting relationship with said partially molten polymer layer on the opposite sides thereof;
• and
• passing the superposed layers through a compression nip providing a gap which is less than the combined thicknesses of the layers and engaging free surfaces of said glass cloth layers with the partially molten polymeric material therebetween whereby the compression nip forces said partially molten polymer layer to flow into and impregnate the first and second glass cloth layers and said free surfaces of said glass cloth layers protrude from said polymer layer to form a core structure.