IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0296956
(1981-08-27)
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발명자
/ 주소 |
- Roberts, Robert L.
- Janssen, Felix G.
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출원인 / 주소 |
- U.S. Environmental Products, Inc.
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대리인 / 주소 |
Allegretti, Newitt, Witcoff & McAndrews, Ltd.
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인용정보 |
피인용 횟수 :
12 인용 특허 :
5 |
초록
▼
An improved rigid filter plate for sludge dewatering is comprised of a filter element of two or more sizes within the range of 8 to 100 grid of jagged, irregular hard particles of aluminum oxide or similar materials, and of a supporting element of larger particles all bonded with an adhesive bonding
An improved rigid filter plate for sludge dewatering is comprised of a filter element of two or more sizes within the range of 8 to 100 grid of jagged, irregular hard particles of aluminum oxide or similar materials, and of a supporting element of larger particles all bonded with an adhesive bonding agent. The particles in the filtering element increase in average diameter progressing from the upper surface to the lower surface of the element. A process for manufacturing the improved rigid filter plate is also set forth.
대표청구항
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1. An improved rigid sludge dewatering filter plate comprising at least two layers; the first layer comprising a thin, flat filtering element having an exposed, dense upper surface and a lower surface; said filtering element consisting essentially of jagged, irregular particles of one or more su
1. An improved rigid sludge dewatering filter plate comprising at least two layers; the first layer comprising a thin, flat filtering element having an exposed, dense upper surface and a lower surface; said filtering element consisting essentially of jagged, irregular particles of one or more substances selected from the group consisting of aluminum oxide, corundum, emery, garnet, silicon carbide, boron carbide and manufactured crystalline alumina products, bonded together with an adhesive bonding agent, wherein the particles are of at least two sizes within the range consisting essentially of about 8 grid to about 100 grid and are oriented with average particle size increasing from the upper surface to the lower surface of the filtering element; and the second layer being a supporting element comprised of particles larger than the largest particles used in the filtering element, bonded together and to the lower surface of the filtering element with an adhesive bonding agent. 2. An improved rigid sludge dewatering filter plate as in claim 1 wherein the jagged, irregular particles of the filtering element are of aluminum oxide. 3. An improved rigid sludge dewatering filter plate as in claim 1 wherein the jagged, irregular particles of the filtering element are of three grid sizes within the range consisting essentially of about 8 grid to about 100 grid. 4. An improved rigid sludge dewatering filter plate as in claim 1 wherein the jagged, irregular particles of the filtering element are of four grid sizes within the range consisting essentially of about 8 grid to about 100 grid. 5. An improved rigid sludge dewatering filter plate as in claim 1 wherein the thickness of the filtering element is between about 1/8 inch and 2 inches. 6. An improved rigid sludge dewatering filter plate as in claim 1 wherein the thickness of the supporting element is between about 1/4 and about 33/4 inches. 7. An improved rigid sludge dewatering filter plate as in claim 1 wherein the supporting element is composed of particles ranging in diameter from 1/8 to 11/2 inches in diameter. 8. An improved rigid sludge dewatering filter plate as in claim 1 wherein the supporting element is reinforced with reinforcing means. 9. An improved rigid sludge dewatering filter plate as in claim 8 wherein the reinforcing means is steel bars located within the supporting element. 10. An improved rigid sludge dewatering filter plate as in claim 8 wherein the reinforcing means is wire mesh located within the supporting element. 11. An improved rigid sludge dewatering filter plate as in claim 1 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 90% of the particles are about 16 grid and about 10% of the particles are about 54 grid. 12. An improved rigid sludge dewatering filter plate as in claim 1 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 70% of the particles are about 16 grid, about 20% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 13. An improved rigid sludge dewatering filter plate as in claim 1 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 45% of the particles are about 16 grid, about 45% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 14. An improved rigid sludge dewatering filter plate as in claim 1 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 20% of the particles are about 16 grid, about 70% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 15. An improved rigid sludge dewatering filter plate as in claim 1 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 10% of the particles are about 16 grid, about 60% of the particles are about 54 grid, and about 30% of the particles are about 100 grid. 16. An improved rigid sludge dewatering filter plate as in claim 1 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 10% of the particles are about 12 grid, about 40% of the particles are about 16 grid, about 40% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 17. An improved rigid sludge dewatering filter plate as in claim 16 wherein the weight ratio of adhesive bonding agent to particles in the filtering element is between about 1:8 and about 1:20 and the weight ratio of adhesive bonding agent to particles in the supporting element is between about 1:6 and about 1:15. 18. An improved rigid sludge dewatering filter plate as in claim 1 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 40% of the particles are about 12 grid, about 40% of the particles are about 16 grid, about 10% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 19. An improved rigid sludge dewatering filter plate as in claim 1 wherein the jagged, irregular particles are arranged in a distribution of sizes such that about 80% of the particles are about 12 grid, about 10% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 20. An improved rigid sludge dewatring filter plate as in claim 1 wherein the adhesive bonding agent is a mixture of a low viscosity epoxy resin and a hardener. 21. A method of manufacturing an improved rigid sludge dewatering filter plate which comprises: (a) mixing an adhesive bonding agent with inert particles of diameter greater than 8 grid to form a supporting element mixture; (b) introducing the supporting element mixture into a filter plate mold to a predetermined depth; (c) tamping the supporting element mixture in the mold; (d) mixing an adhesive bonding agent with jagged, irregular particles of at least two sizes within the range consisting essentially of 8 grid to 100 grid, wherein the particles are comprised of one or more materials selected from the group consisting of aluminum oxide, corundum, emery, garnet, silicon carbide, boron carbide and manufactured crystalline alumina products, to form a filtering element mixture; (e) introducing the filtering element mixture into the filter plate mold to a predetermined depth of between about 1/8 inch and about 2 inches on top of the tamped supporting element mixture; (f) smoothing the upper surface of the filtering element mixture with smoothing means; (g) tamping the filtering element mixture in the mold; and (h) curing the resulting filter plate. 22. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 further comprising the steps of mixing a low viscosity epoxy resin with a hardener to form the adhesive bonding agent employed in steps (a) and (d). 23. The method of manufacturing an improved sludge dewatering filter plate as in claim 21 wherein the jagged, irregular particles of the filtering element are of aluminum oxide. 24. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the jagged, irregular paticles of the filtering element are of three grid sizes within the range consisting essentially of about 8 grid to about 100 grid. 25. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the jagged, irregular particles of the filtering element are of four grid sizes within the range consisting essentially of about 8 grid to about 100 grid. 26. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the thickness of the filtering element is between about 1/8 inch and 2 inches. 27. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the thickness of the supporting element is between about 1/4 inch and about 33/4 inches. 28. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the supporting element is composed of particles ranging in diameter from about 1/8 inch to about 11/2 inches in diameter. 29. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that 90% of the particles are 16 grid and 10% of the particles are 54 grid. 30. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 70% of the particles are about 16 grid, about 20% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 31. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 45% of the particles are about 16 grid, about 45% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 32. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 20% of the particles are about 16 grid, about 70% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 33. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 10% of the particles are about 16 grid, about 60% of the particles are about 54 grid, and about 30% of the particles are about 100 grid. 34. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 10% of the particles are about 12 grid, about 40% of the particles are about 16 grid, about 40% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 35. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the jagged, irregular particles of the filtering element are arranged in a distribution of sizes such that about 40% of the particles are about 12 grid, about 40% of the particles are about 16 grid, about 10% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 36. The method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 wherein the jagged, irregular particles are arranged in a distribution of sizes such that about 80% of the particles are about 12 grid, about 10% of the particles are about 54 grid, and about 10% of the particles are about 100 grid. 37. A method of manufacturing an improved rigid sludge dewatering filter plate as in claim 21 further comprising introducing a portion of the supporting element mixture into the filter plate mold, introducing reinforcing means on top of this, and then introducing the remainder of the supporting element mixture on top of the reinforcing means. 38. A method of manufacturing an improved rigid sludge dewatering filter as in claim 37 wherein the reinforcing means is steel bars located within the supporting element. 39. A method of manufacturing an improved rigid sludge dewatering filter plate as in claim 37 wherein the reinforcing means is wire mesh located within the supporting element.
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