| 摘要 |
PURPOSE: To precisely adjust the speed of a take-up machine without being affected by the vibration etc., of equipment and to keep a film thickness constant in inflation molding by calculating extrusion output and a take-up speed from the output and the cross section and density of the film and adjusting the speed of the take-up machine. CONSTITUTION: When the actual measured value of weight in a raw material measuring part 12 reaches a set lower limit, a raw material is supplied from a raw material supply part 10 to the measuring part 12 by opening an electromagnetic cylinder 11, and the cylinder 11 is closed when the value reaches a set raw material supply stop value. Extrusion output is measured from the instant when the measured value passes a set upper limit until the value reaches a lower limit, T1 , T2 ..., to calculate an average extrusion output QV, a take-up speed LS is calculated by an equation of LS=QV/(width×thickness×efficiency×coefficient of the film), and the driving motor of a take up machine 4 is controlled by the value LS to control the film thickness within a specified standard range. |
