| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a thermoplastic resin sheet which prevents an amount of operation to a thickness adjusting means from diverging so as to stably manufacture a sheet having a minimal thickness fluctuation. <P>SOLUTION: The method of manufacturing the thermoplastic resin sheet comprises the steps of: measuring a thickness distribution in the sheet width direction while the sheet is formed by extruding a material using a die 1 provided with a plurality of thickness adjusting means 2; determining a manipulated variable for outputting to the thickness adjusting means 2 on the basis of the measured value using a process model descriptive of a behavior of a control system; and controlling so that the thickness distribution in the width direction becomes a required thickness distribution by transmitting the manipulated variable to each thickness adjusting means 2, wherein the adjustment of the corresponding relation between a plurality of the thickness adjusting means 2 and measuring points of the thickness distribution in the width direction is performed on the condition that satisfies a predetermined equation after manufacturing at least one roll of the product sheet, and the manipulated variable for inputting to the thickness adjusting means 2 is obtained on the basis of a result of the adjustment. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
