| 摘要 |
PROBLEM TO BE SOLVED: To provide the manufacturing method of a highly lustrous and highly transparent polypropylene sheet as well as a device therefor. SOLUTION: One surface of the polypropylene sheet 12 of molten condition, which is containing nucleating agent, is cooled by a first roll 13 while the other surface of the same is heated by a heating device 16 to the (thermal deformation temperature -10 deg.C)-(melting point +100 deg.C) of the polypropylene sheet 12 and, thereafter, the heated surface of the sheet 12 is cooled by a second roll 15. The surfaces of the first and second rolls 13, 15, which are contacted with the polypropylene sheet 12, are provided with a mirror surface having the surface roughness of 0.5μm or less in the surface roughness Ra. |
