Patent ID: 6203741
Filing Date: 2001-03-20
Classification: B29C,B29K,E02D,Y10T

Abstract:
A process for forming a roughened thermoplastic liner, said process comprising the steps of:extruding a continuous thermoplastic sheet having two opposed surfaces;providing a first calendering roll having a roughened outer surface and a plurality of blind apertures extending from said outer surface into said first calendering roll, each said aperture having an irregularly shaped opening extending coextensively with said outer surface;providing a second substantially smooth calendering roll in spaced parallel relationship from said first calendering roll to define a nip therebetween;urging said thermoplastic sheet through said nip such that one surface of said thermoplastic sheet comes into pressing engagement with said outer surface of said first calendering roll; andremoving said thermoplastic sheet from said first calendering roll such that said irregularly shaped openings of said apertures at least partially damage portions of said sheet.