A polymer filtration apparatus for sealing a slide plate translatable across a bore of an extrusion or mold machine, includes an annular seal having a sealing surface which is biased against the slide plate by a spring mechanism. The annular seal has a thrust surface which is angled relative to the
A polymer filtration apparatus for sealing a slide plate translatable across a bore of an extrusion or mold machine, includes an annular seal having a sealing surface which is biased against the slide plate by a spring mechanism. The annular seal has a thrust surface which is angled relative to the sealing surface and the thrust surface is located at an opposite axial end of the annular seal from the sealing surface. The spring mechanism can be a single spring with overlapping tangs or a multiple spring assembly in overlapping relationship, with or without tangs, to form a continuous barrier. The spring assembly is used to exert a radial force against the thrust surface of the annular seal to bias the seal in an axial direction against the downstream slide plate. In operation, pressurized polymer melt in the extrusion bore further biases the spring against the annular seal which is then transferred to the seal and the slide plate.
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1. A filtration apparatus for an extrusion or injection molding machine having a bore for passage of a polymer melt, said filtration apparatus including a slide plate and a sealing device for sealing said slide plate, said sealing device comprising: an annular seal having a sealing surface which abu
1. A filtration apparatus for an extrusion or injection molding machine having a bore for passage of a polymer melt, said filtration apparatus including a slide plate and a sealing device for sealing said slide plate, said sealing device comprising: an annular seal having a sealing surface which abuts against said slide plate, said slide plate being translatable across the bore of the extrusion or injection molding machine, said annular seal having a thrust surface located at an opposite axial end of said seal from said sealing surface, said thrust surface being angled relative to said sealing surface; anda first spring having a length oriented parallel to an axis of the extrusion or injection molding machine and an angled push surface contacting flush to said thrust surface of said annular seal, said push surface being a complete closed ring for biasing said sealing surface of said annular seal against said slide plate, and wherein said first spring having first and second tangs at opposing ends, each of said first and second tangs having a cross-section with an outside surface and an underside surface with its corresponding push surface therebetween, said first and second tangs are always positioned in overlapping relationship so that an outside surface of said first tang contacts said underside surface of said second tang to form a first radial closure against passage of polymer melt upon expansion and contraction of said first spring caused by a change in pressure of polymer melt in the bore, and wherein increasing radial pressure of polymer melt in the bore forces said first spring to expand so that said first spring uniformly transfers the pressure axially through said closed ring of said push surface against said thrust surface of said annular seal causing said sealing surface of said annular seal to be further biased against said slide plate forming a secure annular axial closure. 2. The filtration apparatus of claim 1, wherein said sealing device further comprising a second spring having a gap, said second spring being positioned within an inside diameter of said first spring in overlapping contact relationship thereby forming a second radial closure with said first spring. 3. The filtration apparatus of claim 1, wherein said sealing device further comprising a second spring having first and second tangs at opposing ends in overlapping contact relationship to form a second radial closure of said second spring, and said second spring being positioned within an inside diameter of said first spring in overlapping contact relationship thereby forming a third radial closure with said first spring. 4. The filtration apparatus of claim 2, wherein said sealing device also includes a third spring having a gap, said third spring being positioned in overlapping contact relationship with an inside diameter of said second spring, and the gap of said second spring is oriented so as not to overlap the gap of said third spring thereby forming a third radial closure with the second spring. 5. The filtration apparatus of claim 2, wherein said sealing device still further comprising a third spring with first and second tangs at opposing ends in overlapping contact relationship to form a third radial closure of said third spring. 6. The filtration apparatus of claim 3, wherein said sealing device also includes a third spring having a gap, said third spring being positioned in overlapping contact relationship with an inside diameter of said second spring, and said gap of the second spring is oriented so as not to overlap said gap of the third spring. 7. The filtration apparatus of claim 3, wherein said sealing device still further comprising a third spring with first and second tangs at opposing ends in overlapping contact relationship to form a third radial closure of said third spring. 8. A filtration apparatus for an extrusion or injection molding machine having a bore for passage of a polymer melt, said filtration apparatus including a slide plate and a sealing device for sealing said slide plate, said sealing device comprising: an annular seal having a sealing surface which abuts against said slide plate, the slide plate being translatable across the bore of the extrusion or molding machine, said annular seal having a thrust surface located at an opposite axial end of said seal from the sealing surface, said thrust surface being angled in relation to said sealing surface; anda spring assembly including first and second springs with each spring having a length oriented parallel to an axis of the extrusion or injection molding machine, each spring further having a gap, an outside surface, an underside surface, and a push surface between said outside and underside surfaces, and said second spring being positioned within an inside diameter of said first spring in overlapping relationship wherein said gap of said second spring is oriented so as not to overlap said gap of said first spring thereby forming a first radial closure between said first and second springs to seal against passage of polymer melt upon expansion and contraction of said springs caused by a change in pressure of polymer melt in the bore, and further wherein said push surfaces of said first and second springs form a closed ring contacting flush to said thrust surface of said annular seal, so that increasing pressure of polymer melt in the bore forces said closed ring of said push surfaces of the first and second contacting springs to move against said thrust surface of said annular seal causing said annular seal to be uniformly biased against said slide plate to secure the axial closure. 9. The filtration apparatus of claim 8, wherein said spring assembly of said sealing device further includes a third spring having a gap, said third spring being positioned in an inside diameter of said second spring in an overlapping contact relationship, and said gap of said third spring being oriented to avoid overlap with said gap of said second spring thereby forming a second radial closure between said second and third springs. 10. The filtration apparatus of claim 8, wherein said second springs includes tangs at opposite ends of its corresponding gap and said tangs being in overlapping contact relationship to form a barrier across said gap of said second spring. 11. The filtration apparatus of claim 10, wherein said sealing device further comprising a third spring with first and second tangs at opposing ends in overlapping contact relationship to form a second radial closure of said third spring. 12. The filtration apparatus of claim 10, wherein said sealing device also includes a third spring having a gap, said third spring being positioned in overlapping contact relationship with an inside diameter of said second spring and said gap of the third spring being oriented so as not to overlap said tangs of the second spring to form a second radial closure. 13. The filtration apparatus of claim 8, wherein said sealing device further comprising a third spring having a gap and first and second tangs at opposing ends in overlapping contact relationship to form a barrier across said gap of said third spring, said third spring being positioned in an inside diameter of said second spring in an overlapping contact relationship therewith, and said gap of said second spring being oriented to avoid overlap with said tangs of said third spring to form a second radial closure. 14. A filtration apparatus for an extrusion machine or injection molding machine having a bore for passing molten resin, said filtration apparatus including a slide plate and a sealing device for sealing the slide plate, said sealing device comprising: an annular seal having a sealing surface which abuts against said slide plate, said slide plate being translatable across the bore of the extrusion or injection molding machine, said annular seal having a thrust surface located at an opposite axial end of said seal from said sealing surface, said thrust surface being angled in relation to said sealing surface; anda spring means having a length oriented parallel to an axis of the extrusion or molding machine establishing a barrier to form a dynamic radial closure to prevent radial passage of molten resin upon expansion and contraction of said spring means caused by a change in pressure of molten resin in the bore, and wherein said spring means includes a push surface contacting said thrust surface in a closed ring that is pressed against said thrust surface, being operable so that increasing pressure of polymer melt in the bore is transferred by said push surface of said spring means against said thrust surface of said annular seal causing said annular seal to be further biased along the axis of the extrusion or molding machine and against said slide plate for a secure axial closure between said sealing surface of said annular seal and said slide plate. 15. The filtration apparatus of claim 14, wherein said spring means further comprises a first spring with a first gap and second spring having a second gap, the second spring being positioned in contact relationship with an inside diameter of the first spring and said second gap being oriented to avoid overlap with said first gap of said first spring to form said dynamic radial closure. 16. The filtration apparatus of claim 14, wherein said spring means further comprises a first spring with tangs at opposite ends in overlapping contact relationship so as to form said dynamic radial closure. 17. The filtration apparatus of claim 15, wherein said spring means further comprises a third spring having a gap, the third spring being positioned in contact relationship with an inside diameter of said second spring, and further wherein said gap of said second spring is oriented so as not to overlap the said gap of said third spring. 18. The filtration apparatus of claim 16, wherein said spring means further comprises a second spring having a gap, said second spring being positioned in contact relationship with an inside diameter of said first spring, and said gap being oriented to avoid overlap with said tangs of said first spring. 19. The filtration apparatus of claim 1, wherein the first tang having a radial thickness different than a radial thickness of the second tang.
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이 특허에 인용된 특허 (7)
Schier Walter (Bruck an der Mur ATX) Retschnik Gerald (Niklasdorf ATX), Apparatus for sealing a high pressure installation including a movable member, especially an oscillatory movable plunger.
Mader Heinrich-Christian (Bursheid DEX) Mierbach Albin (Leverkusen DEX) Schmelter Wolfgang (Leverkusen DEX), Piston ring having a non-uniform radial pressure distribution.
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