| 摘要 |
PROBLEM TO BE SOLVED: To solve problems that there is a fear of influences on human bodies and environments though jigs, etc., to which a raw material sticks in a step of mixing and injecting the raw material for molding a plastic are cleaned with a solvent such as methylene chloride. SOLUTION: Cleaning gentle to the environments including the human bodies can be carried out by using a solvent excellent in detergency, drying properties and safety without containing a chlorine-based organic solvent.
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