| 摘要 |
PURPOSE:To shorten the secondary extruding part of a device by regulating the back pressure stream generated at the secondary extruding part of a vent extruder by the gear pump for transferring high viscosity material, and by stabilizing its extruded amount. CONSTITUTION:The gear pump 30 for transferring high viscosity molten material is arranged in between the tip part and the molding die 20 of a vent extruder 10. In the main body of this gear pump 30, the gears mutually rotating in circumferential direction are oppositely provided, and a compressive part is provided at its peripheral part and operates forcibly so as to draw or extract the molten material by the pressurizing action for said material in this part. Accordingly, the back pressure stream at secondary extruding part 12C accompanied by the change of extruding condition, i.e. the change by resin pressure may be arbitrarily regulated. Consequently, the effect of the vent port and the extruded amount which are always stabilized may be insured. |
