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In order to provide durable structure and stability to the dry filter fabric, the fabrics are generally passed through calendering machine which has got pair of heated rollers, pressing the coated material under certain pressure and temperature. With this view in mind, the present study has been made to compare the properties of the fabrics manufactured using virgin and recycled polyester fibres. In order to study the effect of different processing parameters, the effect of coating with different add-on percentage, calender roller pressure and calender roller temperature on pressure drop and filtration properties have been made. The results have shown that the add-on percentage during coating results throughout increase in pressure drop, dust holding capacity (DHC) and filtration efficiency; within the limits the study has been made. Increase in calender roller pressure results an initial increase in pressure drop and filtration efficiency subsequently it became constant. The increase in calender roller temperature results initial increase in pressure drop, DHC and filtration efficiency subsequently it decreased. Such a trend is seen for both virgin and recycled polyester filter fabrics and the differences of filtration values are insignificant. Considering, recyclability and sustainability aspects, recycled polyester fibre can be used in place of virgin polyester fibre in the manufacturing of needle punched nonwoven dust filter fabrics without affecting basic filtration properties.

Virgin and recycled polyester filter media: effect of coating, calender roller pressure and roller temperature on dust filtration