FORMATION OF EXTRUDED PIECE OF THERMOPLASTIC RESIN

摘要

PURPOSE:To make an effective automatic control and to improve dimensional precision by detecting with a sensor variation of loads generated when molten resin comes in contact with a sizing die in a molding time and feeding it back to a controller. CONSTITUTION:The variation of loads generated when molten resin 3 comes in contact with a sizing die 4 in a molding time is detected with a sensor 8 and fed back to a controller 9. The controller 9 controls the driving motor 10 of a take-up unit 6 or the driving motor 11 of an extruder 1 so that the constant load is always kept and adjusts the take-up speed or the extruding quantity. The molten resin 3 extruded from the profile die 2 of the extruder 1 is sent to a sizing die 4, passed through a cooling water 5, taken up by the take-up unit 6 in the direction of the arrow. A load detecting sensor 8 is fixed to a fixing stand 7 of the sizing die 4.