Process for preparation of thermoplastic resin sheets

Details Process for preparation of thermoplastic resin sheets Process for preparation of thermoplastic resin sheets

B - Operations, Transporting

29

C

18/1036

B29C 41/26 (2006.01) B29C 47/88 (2006.01)

Patent

CA 1323166

PROCESS FOR PREPARATION OF THERMOPLASTIC RESIN SHEETS ABSTRACT OF THE DISCLOSURE A thermoplastic sheet is prepared by (i) extruding a molten thermoplastic resin in the form of a sheet from a molding die; (ii) applying static charges to the extruded resin sheet from a first electrode whereby the charged resin sheet is pinned to the surface of an electrical insulating layer of a quenching roller to quench the resin sheet; (iii) peeling the quenched sheet from the surface of the quenching roller; and (v) applying electrostatic charges having a reverse polarity to that of the electrostatic charges from the first electrode to the exposed surface portion of the quenching roller from a second electrode. The quenching roller comprises an electrically earthed substrate and the electrical insulating layer formed on the surface of the substrate. The second electrode comprises a plurality of electrodes arranged at intervals along the rotating direction of the quenching roller between the sheet-peeling position where the quenched sheet is peeled from the quenching roller and the sheet pinning-initiating position where the sheet to be quenched is pinned to the quenching roller, and the electrical insulating layer has a volume resistance and surface resistance of at least 107 .OMEGA. and a surface roughness not larger than 0.3 µm expressed as the center line average roughness(Rs).

600525

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