| 摘要 |
<p>PURPOSE:To keep a good controllability of heat energy and to obtain a die for extruding a sheet-like material of uniform thickness by providing a controlling device being able to control the amt. of heat energy supplied to whole pushing/pulling transmitting devices to be constant. CONSTITUTION:Before extruding a thermoplastic resin, the temp. of a die for extrusion and the thermoplastic resin are kept almost uniform at T deg.C by the heat energy Q1 supplied to a main heating device 2. The energy supplied to whole supplementary heating devices 4 is Q2 and the energy supplied to each supplementary heating device 41-49 is equally Q2/9. Marry sets of pushing/ pulling transmitting devices 3 almost uniformly thermally expand with a specified amt. over he whole width of the die. A controlling device 10, keeping the whole energy Q2 supplied to the supplementary heating devices 41-49 to be constant by reducing an energy DELTAQ2 supplied to each supplementary heating device 41-43, 46-49 to offset the increment DELTAQ2 supplied to the supplementary heating device 45 to keep the thickness of the extruded film to be constant, is provided.</p> |
