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A filtration apparatus for use in polymer processing includes a housing having an internal bore for directing polymer flow and a channel oriented transversely to the bore. A slide plate for supporting filters is movable through the channel and across the bore. An annular upstream seal ring sealably

A filtration apparatus for use in polymer processing includes a housing having an internal bore for directing polymer flow and a channel oriented transversely to the bore. A slide plate for supporting filters is movable through the channel and across the bore. An annular upstream seal ring sealably contacts the slide plate. A surface of the upstream seal ring facing the upstream direction is angled with respect to the bore. A plurality of ring segments are arranged to form an annular segmented ring. The segmented ring presents a tapered ring surface that is generally complimentarily angled relative to the angled surface of the upstream seal ring. Pressurized polymer flowing through the bore imparts radially forces on the ring segments, causing the ring segments to impart axial forces on the upstream seal ring to enhance the seal interface between the upstream seal ring and the slide plate.

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What is claimed is: 1. A filtration apparatus for use in polymer processing systems, comprising: (a) a housing having an internal bore for directing a polymer flow in a channel oriented transversely to the bore; (b) a slide plate movable through the channel and across the bore and comprising an ups

What is claimed is: 1. A filtration apparatus for use in polymer processing systems, comprising: (a) a housing having an internal bore for directing a polymer flow in a channel oriented transversely to the bore; (b) a slide plate movable through the channel and across the bore and comprising an upstream slide plate surface, a downstream slide plate surface, and at least one filter element; (c) an upstream seal ring annularly disposed about a central bore axis of the bore and comprising first and second opposing upstream seal surfaces, the first upstream seal surface facing downstream for sealably contacting the upstream slide plate surface, and the second upstream seal surface angled with respect to the bore axis; and (d) a plurality of separate and individual ring segments arranged in frictional engagement with each other to form a segmented ring annularly disposed about the bore axis, each ring segment comprising a tapered ring surface generally complementarily angled relative to and sealably contacting the second upstream seal surface. 2. The apparatus according to claim 1 comprising an annular downstream seal ring comprising a first downstream seal surface sealably contacting the downstream slide plate surface of the slide plate. 3. The apparatus according to claim 2 comprising an annular adjustment ring sealably contacting a second downstream seal surface of the downstream seal ring opposing the first downstream seal surface, the adjustment ring being axially adjustable along the bore for biasing the downstream seal ring against the slide plate. 4. The apparatus according to claim 3 comprising an annular bushing disposed in the housing and defining a downstream section of the bore, wherein the downstream seal ring and the adjustment ring are coaxially disposed about the bushing. 5. The apparatus according to claim 4 wherein the adjustment ring threadly engages an outer surface of the bushing. 6. The apparatus according to claim 1 wherein the ring segments are constructed of a metal. 7. The apparatus according to claim 6 wherein the ring segments are constructed of a steel. 8. The apparatus according to claim 1 comprising an annular connector ring contacting the plurality of ring segments, wherein the ring segments are axially interposed between the upstream seal and the connector ring. 9. The apparatus according to claim 8 wherein the connector ring is secured to the housing with axially oriented fastening members. 10. The apparatus according to claim 8 wherein the connector ring comprises a biasing device contacting the ring segments for axially biasing the ring segments against the upstream seal ring. 11. The apparatus according to claim 10 wherein the biasing device comprises a plurality of biasing components circumferentially arranged about the bore axis. 12. The apparatus according to claim 11 wherein the biasing components comprise compression springs. 13. The apparatus according to claim 11 wherein the connector ring has a plurality of mounting recesses and each biasing component is disposed in a respective recess. 14. A filtration apparatus for use in polymer processing systems, comprising: (a) a housing having an internal bore for directing a polymer flow in a channel oriented transversely to the bore; (b) a slide plate moveable through the channel and across the bore and comprising an upstream slide plate surface, a downstream slide plate surface, and at least one filter element; (c) an upstream seal ring annularly disposed about a central bore axis of the bore and comprising first and second opposing upstream seal surfaces, the first upstream seal surface facing downstream for sealably contacting the upstream slide plate surface, and the second upstream seal surface angled with respect to the bore axis; (d) a plurality of separate and individual ring segments arranged in frictional engagement with each other to form a segmented ring annularly disposed about the bore axis, each ring segment comprising a tapered ring surface generally complementarily angled relative to and sealably contacting the second upstream seal surface; (e) a downstream seal ring annularly disposed about the bore axis, the downstream seal ring comprising a first downstream seal surface facing upstream for sealably contacting the downstream slide plate surface, and an opposing second downstream seal surface; and (f) an adjustment ring annularly disposed about the bore axis and sealably contacting the second downstream seal surface, the adjustment ring being axially adjustable along the bore for biasing the downstream seal ring against the slide plate. 15. The apparatus according to claim 14 comprising a annular bushing disposed in the housing and defining a downstream section of the bore, wherein the downstream seal ring and the adjustment ring are coaxially disposed about the bushing. 16. The apparatus according to claim 15 wherein the adjustment ring threadly engages an outer surface of the bushing. 17. The apparatus according to claim 14 comprising an annular connector ring contacting the plurality of ring segments, wherein the ring segments are axially interposed between the upstream seal ring and the connector ring. 18. A filtration apparatus for use in polymer processing systems, comprising; (a) a housing having an internal bore for directing a polymer flow in a channel oriented transversely to the bore; (b) a slide plate movable through the channel and across the bore and comprising an upstream slide plate surface, a downstream slide plate surface, and at least one filter element; (c) an upstream seal ring annularly disposed about a central bore axis of the bore and comprising first and second opposing upstream seal surfaces, the first upstream seal surface facing downstream for sealably contacting the upstream slide plate surface, and the second upstream seal surface angled with respect to the bore axis; (d) a plurality of separate and individual ring segments arranged in frictional engagement with each other to form a segmented ring annularly disposed about the bore axis, each ring segment comprising a tapered ring surface generally complementarily angled relative to and sealably contacting the second upstream seal surface; and (e) a connector ring annularly disposed about the bore axis and sealably contacting the ring segments, wherein the ring segments are axially interposed between the upstream seal and the connector ring. 19. The apparatus according to claim 18 wherein the connector ring comprises a biasing device contacting the ring segments for axially biasing the ring segments against the upstream seal ring. 20. The apparatus according to claim 18 wherein the biasing device comprises a plurality of biasing components circumferentially arranged about the bore axis. 21. The apparatus according to claim 20 wherein the biasing components comprise compression springs. 22. The apparatus according to claim 20 wherein the connector ring has a plurality of mounted recesses and each biasing components is disposed in a respective recess. 23. The apparatus according to claim 18 comprising an annular downstream seal ring comprising a first downstream seal surface sealably contacting the downstream slide plate surface of the slide plate. 24. The apparatus according to claim 23 comprising an annular adjustment ring sealably contacting a second downstream seal surface of the downstream seal ring opposing the first downstream seal surface, the adjustment ring being axially adjustable along the bore for biasing the downstream seal ring against the slide plate.