| 摘要 |
A polymer solution is obtained by cooling and heating a mixture of polymer and solvent. Then a filtration of the polymer solution is continuously performed. Then after the polymer solution is stored in the stock tank for two weeks, a second filtration of the polymer solution is continuously performed. In each filtration, an initial filtration pressure is 0.1 MPa. Until the filtration pressure becomes 1 MPa, the filtration quantity per unit size of a filter material is t1 (m<SUP>3</SUP>) in the first filtration and t2 (m<SUP>3</SUP>) in the second filtration. The flow rate of the polymer solution is controlled such that a value t2/t1 may be at least 0.5.
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