CLEANING METHOD OF POLYOLEFIN FILM

摘要

PROBLEM TO BE SOLVED: To provide a cleaning method which has high cleaning effect for organo polysiloxane and suppresses the deterioration of a polyolefin film when performing cleaning and regeneration treatment of the polyolefin film used for impurity removal and concentration of methane gas in efficient use of methane gas generated by anaerobic digestion fermentation of waste such as livestock excreta, kitchen waste and sludge of sewage disposal.SOLUTION: In a cleaning method of a polyolefin film, a polyolefin film is cleaned by using a surface active agent aqueous solution containing (1) an organic solvent having a solubility parameter (MPa) of 19.0 to 35.0 and (2) a nonionic type surfactant having HLB 6.0 to 14.5 in the concentration of 0.1 to 10 wt.%, thereby, the deterioration of the polyolefin film is suppressed and organo siloxane attached to the polyolefin film can be efficiently cleaned.