| 摘要 |
PURPOSE:To prevent vent up in the captioned extrusion machine by a system wherein a resin pressure is detected between a vent hole and a filter and the pressure in a connecting pipe arrranged between first and second extrusion mahines is controlled in accordance with the amount of fluctuation in the resin pressure. CONSTITUTION:A resin pressure detector 16 is provided at the downstream side of a vent hole 5 for the second stage extrusion machine 3 and a signal obtained by detecting the amount of fluctuation in the resin pressure is sent to a comparator 20 through a low-pass filter 17, subsequently, a difference signal obtained by comparing the signal with a set value from a pressure setter 18 is sent to the comparator 11 through an amplifier 19. Next, this signal is compared with a pressure signal in the connecting pipe 2 which is obtained by detecting with the resin pressure detector 9 and the difference signal thereof is utilized to control the first motor 8 which controls, in turn, the resin pressure in the connecting pipe 2 by increasing or decreasing the resin extrusion amount of the first stage extrusion machine. |
