Process for producing a rolled film or sheet

摘要

A process is provided for producing a rolled thermoplastic resin film or sheet having a small difference in mechanical strength between the longitudinal and lateral dimensions of the film or sheet comprising rolling a thermoplastic resin material at least once by means of a pair of rolls arranged obliquely to the advancing direction of the resin material, followed by further rolling at least once the resulting film or sheet by means of another pair of rolls arranged obliquely to the advancing direction of the material, but symmetrically opposite to the former oblique arrangement, the temperature of the rolling and further rolling being room temperature or higher and lower than the melting point or softening point of the resin material, and the distance (d1) between the lateral end parts on one side of each pair of rolls which first contact the resin material being less than the distance (d2) between lateral end parts on the opposite side of each pair of rolls.