METHOD AND DEVICE FOR TREATMENT OF POLYMERIC MATERIAL Russian patent published in 1999 - IPC

FIELD: plastics. SUBSTANCE: polymeric material is treated in the device by zones in the presence of softener or its mixture. Softener is introduced into the first zone of treatment in amount of 0.1 to 1% of the mass of the material under treatment. Softener is introduced into the second zone of treatment in amount of 0.5 to 5%. A temperature of 90 to 130 deg. C and a steam pressure of 10 to 20 kPa are set up in the first zone, and a temperature of 110 to 160 C and a steam pressure up to 10 kPa are set up in the second zone. In the outlet zone the steam pressure is reduced down to 10 kPa. The device for treatment of polymeric material has a bed, housing, multidiameter cylindrical shaft, temperature control mechanism, multiple-thread screw conveyer in each zone of material treatment, the respective diameter of the cylindrical shaft located past the screw conveyer, slot formed by the housing and respective diameter of the cylindrical shaft. In the device outlet section provision is made for a gap for adjustment, formed by the surface of the outlet screw conveyer and the cover located on the housing above the cylindrical shaft. The shaft is coupled to an electric drive and is made with an increasing diameter to the device outlet section. The diameters of the multiple-thread screw conveyers increase with respect to one another by 0.5 of the screw conveyer pitch to the device outlet section. The gap is formed by the end surface of the screw conveyer and cover. The method and the device are ecologically safe, provide for continuous treatment of polymeric material and monitoring of the process within a wide range. EFFECT: reduced wear of working members. 2 cl, 1 dwg