| 摘要 |
PROBLEM TO BE SOLVED: To reduce costs of printed matter and recycle used oils left after food production by forming an ink containing regenerated vegetable oils. SOLUTION: Vegetable oil used for food production are sorted according to the acid value, filtered and allowed to stand to settle. The supernatant then is collected and subjected to regeneration treatment such as decoloration with activated clay. The regenerated vegetable oils have a water absorption of 0.3 wt.% or less, an iodine value of 100 or more and an acid value of 3 or less and prevents excess emulsification in preparation of inks and improves drying properties. An example of a composition of an ink for sheet-feed press is 10-20 wt.% of pigment, 25-30 wt.% of resin, 25-40 wt.% of solvent, 10-25 wt.% of oil, 0.5-1.5 wt.% of drier and 0-10 wt.% of adjuvant. Use of the regenerated vegetable oils as part of oils and solvents can reduce emission of volatile organic matter compared to the inks using petroleum-based solvents. The vegetable oils include soy oil, rapeseed oil, rice oil, cottonseed oil, sesame oil, safflower oil and palm oil.
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