Abstract:

A low-cost testing apparatus used for testing the oil content of cellulose acetate fibers online was designed. Cellulose acetate fibers before and after oiling were tested, respectively, using two capacitance sensors (NO.0 sensors and NO.1 sensors). Then the oil content of fibers was calculated according to the voltages difference of two sensors. The test was divided into two phases: firstly calibrated the sensors; changed the revolving speed of the oiling roller to change the content of emulsion on cellulose acetate fibers, then measured the change of the output voltage of the sensors. The results show that a significant linear correlation esists between the output voltage of the cacitance sensors and the linear density of oilless fibers. For the emulsion of a certain concentration, the output voltage of the NO.1 sensor is positively correlated with the emusion volume on the fibers. Aquadratic function about the oil content and the output voltage was established. The differences between the oil content calculated using the function and that calculated using oven drying method are less than 5.2%.

Key words: cellulose acetate fiber, oil content, capacitance sensor, online test