Influence of Kraft Paper on the Ageing of Palm Oil, Corn Oil and Rice Bran Oil

This paper presents a sealed ageing study of palm oil, corn oil, and rice bran oil with and without the presence of insulation paper. The oils were aged at four different durations which are at 2 days, 30 days, 90 days, and 180 days at a constant temperature of 90 degrees C. The properties of vegetable oils as well as insulation paper under ageing were then analysed through AC breakdown voltage, dielectric losses, relative permittivity, resistivity, moisture, and acidity of the oils. It is found that the AC breakdown voltage of oils with the presence of insulation paper is lower than the oils without the insulation paper. The AC breakdown of oils with and without insulation paper increase with the ageing time which reflect the amount of moisture in oil. For dielectric loss, the value is increased with time and dielectric loss with paper shows lower value than without paper. RBO shows higher dielectric losses for both conditions. In term relative permittivity, it can be concluded that the relative permittivity increases when the time ageing increase. It is seen that relative permittivity of palm oil is the highest change in duration of time ageing from 1.8 to 2.0 for both conditions. Throughout the ageing time, the acidities of all the oil samples remain at low level for ageing without paper. However, with the presence of paper, the number of acidities for all oil samples increased with the time. With the presence of Kraft paper, the viscosity will decrease over time duration. But, without the presence of Kraft paper, the viscosities were almost stable for all samples.