| 摘要 |
A cleansing agent, in particular for the cleaning of printing cylinders, rollers, blankets, plates and other parts of printing machines and presses, comprises from 90 to 60% by weight of a C6-C14, preferably C6-C12, more preferably C6-C10, most preferably C7-C9, hydrocarbon ester of a fatty acid of a mixture of such acids and from 10 to 40% by weight of a vegetable oil, based on the total weight of the fatty acid hydrocarbon ester and the vegetable oil in the cleansing agent. Preferably, the content of vegetable oil is about 25% by weight. Preferably, the fatty acid ester component is a 2-ethylhexyl ester of coconut (C8-C14) fatty acid and the vegetable oil is a highly refined deodorized soyabean oil.-Dirt or smear comprising particles, dust, fibers, printing ink and dye and/or greasy substances are removed from the surfaces of cylinders, rollers, blankets, plates and other parts or members of printing machines and presses, by applying to said surface a sufficient amount of the cleansing agent of the invention and allowing the cleansing agent to react with the dirt or smear on the said surface so as to dissolve, unstick, loosen or solubilize it and then remove the cleansing agent with the dissolved, unstuck, loosened or solubilized dirt or smear contained therein. Compared to other vegetable and VOC cleansers the new cleansing agent: has better cleansing properties, is less aggressive (swelling) to nitrile rubber components, does not penetrate the enemal or paint on those parts of the printing machines covered with such coatings, does not destroy or decompose the copying film on offset printing plates, has less tendency to dissolve plastic tubes and hoses, glue and additives in automatic washing apparatuses.
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