| 摘要 |
PURPOSE:To efficiently wash the inside of a porous high polymer film pipe in a deaerator with a simple installation at a short time by intermittently repeating pressurization and decompression of the outer pressure of the film pipe for the inner pressure thereof while passing washing liquid through the film pipe. CONSTITUTION:While passing the washing liquid consisting of only a solvent free from a solute such as high polymer incorporated in liquid dissolved with high polymer to be deaerated through a porous high polymer film pipe 1, the outer pressure of the film pipe is intermittently pressurized and decompressed for the inner pressure of the film pipe 1, and the inside of the pipe 1 is washed. Thereby the washing liquid 10 is forcedly brought into contact with the high polymers deposited in fine holes of the inner wall of the film pipe 1 and the washing liquid 10 dissolved with deposited high polymers is substituted, or turbulent flow is caused on the surface of the inner wall of the film pipe 1. More effective washing can be promoted by mixing air into the washing liquid 10 passing through the above-mentioned film pipe 1 and using the mixture.
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