| 摘要 |
<p>Filter elements for use in removing contaminants from molten thermoplastic melt comprising a rigid planar member having a plurality of ridges arranged perpendicular to a direction of processing over the ridges which gradually increase in height in such direction of processing. The invention also provides a filter assembly wherein a plurality of filter elements in the face of a disc are mounted around a perforated hollow cylindrical tube, the elements abuttingly engage each other to define radial (with respect to the tube) filtering passages between adjacent side-faces of successive reusable toroidal filter elements, contaminating particles are trapped in the decreasing space of the radial filtering passages of abutting filter elements as melt flows through the radial filtering passageways over the ridges and through the troughs of abutting elements.</p> |
