| 摘要 |
PROBLEM TO BE SOLVED: To prevent the clogging and corrosion of a waste plastic-treating device while facilitating a temperature control and reducing a treatment expense by liquefying and extracting the ester-based polymers in a relatively low temperature, low viscosity oil bath to prevent the generation of crystalline organic materials such as terephthalic acid or benzoic acid by excess decomposition. SOLUTION: The oil temperature in an oil bath 32 is kept within the range of 280-320°C by a heating means 33, and the agitating blades 34 are installed in the oil bath 32 to agitate the oil so as not to vertically convect. The oil bath has a means 96 for suppressing the elevation of a settled liquefied oil 94 in its lower part, an outlet 32a for taking out a floating residue 43, non-liquefied waste plastics 44 and a liquefying oil 46 in its upper part, and an oil discharge opening 32b in its lower part. Further, a specific gravity sensor 86 for sensing the specific gravity of the oil in the bath is installed at a prescribed distance above the inside bottom face of the bath, and based on the detection output of the sensor, a controller 92 controls the opening/closing of the oil discharge opening 32b. COPYRIGHT: (C)2005,JPO&NCIPI
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