STYRENE-BASED RESIN SHEET

摘要

PROBLEM TO BE SOLVED: To obtain the subject sheet prevented from warpage or meandering and improved in printing misalignment in vessel molding operation. SOLUTION: This styrene-based resin sheet is such one as to meet the following requirements: (A) surface glossiness measured at an angle of incidence of 60 deg. in accordance with JIS K5406 is >=10%; (B) centerline average roughness measured in accordance with JIS B0601 is <=5μm; (C) the maximum value MS and the minimum value NS of heat shrinkage in the TD direction determined using the procedure in accordance with JIS K6734 for MD direction and measured at the temperature 30 deg.C higher than the Vicat softening point determined in accordance with JIS K7206 satisfy such a relationship that SR defined by the formula: SR=[(MS-NS)/NS]×100 lies within the range 0-300%; and (D) the maximum value MR and the minimum value NR of heat shrinkage stress in the TD direction determined using the procedure in accordance with ASTM D1504 for MD direction and measured at the temperature 30 deg.C higher than the Vicat softening point determined in accordance with JIS K7206 satisfy such a relationship that RS defined by the formula: RS=[(MR-NR)/NR]×100 lies within the range 0-300%.