| 摘要 |
A filtration device having therein a pleated, twisted filtration material is provided. The filtration material has a generally cylindrical shape and includes a first end, a second end opposing the first end, and outwardly projecting pleats. The pleats have a non-linear orientation within the filtration device. The twisting of the filtration material moves the ends of the pleats a distance around the circumference of the filtration material from a first position (P1) to a second position (P2). The angle of rotation may range from about 5 degrees to about 1440 degrees. Twisting the filtration material increases the effective amount of filtration material in the filtration device, which in turn, corresponds to an increase in the Effective Filtration Area (EFA). The intentional misalignment of the pleat ends in the filtration material improves the cutting ability of the material, removes buckling of the material, and improves the quality of the trim cut. |
