| 摘要 |
<p>PROBLEM TO BE SOLVED: To simply set initial forming conditions complying to a film to be formed. SOLUTION: Data on the density of a raw material and the amount of extruded raw material measured based on the arbitrary number of rotation of a screw 15 pertaining to the raw material, is obtained and a characteristic graph of the number of rotations of the screw and the amount of extruded raw material is prepared and stored in a first storage part 20. Further, the characteristic graph of the frequency of a blower 17 for a grade classification obtained based on an arbitrary thickness and a production grade is prepared and stored in a second storage part 21. At the time of the initial forming of an inflation film, data on the production grade, forming thickness and folding width is entered by an input part 22. In addition, a first calculation part 24 decides the production grade and the forming thickness, and seeks a logical take-in speed based on the grade classification, and the logical frequency of the blower 17 based on the characteristic graph. A second calculation part 24 seeks the logical extrusion amount of a raw material based on the logical transaction rate, width, thickness and density. Besides, the second calculation part 24 decides the logical number of rotations of a screw based on the characteristic graph.</p> |
