Role of Spinning Machine Process Variables on Porosity of DREF Spun Yarn

Polypropylene spun yarn is very widespread as filtration media to manufacture candle filters. The porosity of the yarn plays a vital role in deciding the performance characteristics of filters wound from it. Since the DREF spinning system is used to produce string from which the wound filters are constructed, the spinning parameters also strongly influence the resultant yarn properties. This study aimed to understand the impact of the speed ratio, spinning drum speed, and suction pressure on the yarn properties and porosity. Design Expert13 & REG; was used to find the main spinning process parameters that influenced yarn properties. Suction pressure was the most prominent factor influencing the yarn porosity, followed by the speed ratio, while spinning drum speed did not affect significantly.