an apparatus and methods for forming micro spike thermoplastic liners and micro spike thermoplastic liners formed thereby are provided . a textured thermoplastic liner having at least one roughened surface with a plurality of irregularly shaped projections extending therefrom is disclosed . the thermoplastic liner of the subject invention is formed by using a calendering roll having a generally cylindrically shaped body with a non - smooth outer surface and a plurality of blind apertures , each having an irregularly shaped opening formed coextensively with the non - smooth surface . the liner is formed by having the non - smooth surface of the calendering roll impress a roughened pattern onto the liner and simultaneously form the plurality of irregularly shaped projections . the calendering roll is formed by initially drilling a plurality of blind apertures and , subsequently , roughening the outer surface of the roll such that the openings of each of the apertures are each caused to be irregularly shaped .