Bhattacharjee Moumita, Roy Ananda Sankar, Ghosh Santinath, Dey Munmun
DIC India Limited, Taratola, Kolkata, India.
J Oleo Sci. 2011;60(1):19-24. doi: 10.5650/jos.60.19.
The conventional offset lithographic printing ink is mainly based on linseed oil. But in recent years, due to stiff competition from synthetic substitutes mainly from petroleum products, the crop production shrinks down to an unsustainable level, which increases the price of linseed oil. Though soyabean oil has replaced a major portion of linseed oil, it is also necessary to develop alternate cost effective vegetable oils for printing ink industry. The present study aims to evaluate the performance of karanja oil (Pongamia glabra) as an alternative of linseed oil in the formulation of offset printing ink because karanja oil is easily available in rural India. Physical properties of raw karanja oil are measured and compared with that of alkali refined linseed oil. Rosin modified phenolic resin based varnishes were made with linseed oil as well as with karanja oil and their properties are compared. Sheetfed offset inks of process colour yellow and cyan is chosen to evaluate the effect of karanja oil in ink properties. In conclusion, karanja oil can be accepted as an alternate vegetable oil source with its noticeable effect on print and post print properties with slower drying time on paper. However, the colour and odour of the oil will restrict its usage on offset inks.
传统的胶版印刷油墨主要以亚麻籽油为基础。但近年来，由于主要来自石油产品的合成替代品的激烈竞争，亚麻籽的产量缩减至难以为继的水平，这使得亚麻籽油价格上涨。尽管大豆油已取代了大部分亚麻籽油，但为印刷油墨行业开发具有成本效益的替代植物油仍是必要的。本研究旨在评估卡兰贾油（水黄皮）作为亚麻籽油替代品在胶版印刷油墨配方中的性能，因为卡兰贾油在印度农村很容易获得。对生卡兰贾油的物理性质进行了测量，并与碱炼亚麻籽油的物理性质进行了比较。用亚麻籽油和卡兰贾油制备了松香改性酚醛树脂清漆，并对其性能进行了比较。选用胶版印刷的黄色和青色原色油墨来评估卡兰贾油对油墨性能的影响。总之，卡兰贾油可被视为一种替代植物油源，它对印刷和印后性能有显著影响，在纸张上干燥时间较慢。然而，该油的颜色和气味将限制其在胶版油墨中的使用。
