Method for the manufacture of thermoplastic resin sheets

Details Method for the manufacture of thermoplastic resin sheets Method for the manufacture of thermoplastic resin sheets

B - Operations, Transporting

29

C

18/794, 18/796

B29C 47/14 (2006.01) B29C 47/00 (2006.01) B29C 47/16 (2006.01) B29D 7/01 (2006.01) B32B 17/10 (2006.01)

Patent

CA 2013383

- 25 - ABSTRACT OF THE DISCLOSURE A method for the manufacture of thermoplastic resin sheets comprising extruding molten thermoplastic resin at an extrusion velocity V through a slit provided in an extrusion mold so as to form thermoplastic resin sheets with embossed surfaces, wherein said thermoplastic resin is extruded from said slit in said extrusion mold under conditions such that the ratio V/H of said extrusion velocity V to the width H of said slit exceeds a critical value (V/H)c, said critical value (V/H)c being the ratio of the extrusion velocity to the width of the mold slit corresponding minimum value of the roughness of the embossment formed on the surface of said thermoplastic resin sheets, whereby defects such as the adhesion to and winding onto rollers, inferior appearance and sizing marks which are prone to occur when the sheets are embossed with embossing rollers.

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