IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0270228
(1981-06-04)
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우선권정보 |
FR-0013497 (1980-06-18) |
발명자
/ 주소 |
- Delcoigne, Adrien
- Lanneau, Jacques
|
인용정보 |
피인용 횟수 :
17 인용 특허 :
2 |
초록
▼
This invention is concerned with the plaster industry and, more precisely, with the elimination of excess water in objects containing hydratable calcium sulphate and water. It offers to subject the said objects to a high efficiency thermic drying before the end of the hydration of the calcium sulpha
This invention is concerned with the plaster industry and, more precisely, with the elimination of excess water in objects containing hydratable calcium sulphate and water. It offers to subject the said objects to a high efficiency thermic drying before the end of the hydration of the calcium sulphate, and to stop the said drying, while allowing enough water for the continuation of hydration to remain in the objects. It is applied, more specifically, to the manufacture of plaster board.
대표청구항
▼
1. Process for elimination of the excess water contained in continuous ribbons, obtained by shaping a mixture consisting essentially of hydratable calcium sulphate, water, required to hydrate said sulphate, and an excess of water beyond that required for total hydration of said sulphate, wherein the
1. Process for elimination of the excess water contained in continuous ribbons, obtained by shaping a mixture consisting essentially of hydratable calcium sulphate, water, required to hydrate said sulphate, and an excess of water beyond that required for total hydration of said sulphate, wherein the improvement comprises shaping a mixture essentially of hydratable calcium sulphate and water, and beginning thermic drying of said ribbon to completion of hydration of said sulphate, and continuing said thermic drying until said excess water is in the range of 1-5%. 2. Process as in claim 1, wherein the thermic drying is begun after the ribbons have attained sufficient hydration to give enough mechanical solidity to be manipulated. 3. Process as in claim 2, wherein the degree of hydration immediately before thermic drying is from 20 to 50%. 4. Process as in claim 2, wherein hydration is accelerated by extracting water until said ribbons become manipulable. 5. Process as in claim 2, wherein hydration is accelerated by addition of setting modulators until such ribbons become manipulable. 6. Process as in claim 4, wherein hydration is plowed down after mechanical solidity is attained by subjecting the ribbons to high temperature in a dryer. 7. Process as in claim 4, wherein prior to thermic drying, excess water is extracted from the ribbon by suction. 8. Process as in claim 7, wherein the suction uses vacuum pressures less than what would cause fissure said ribbons. 9. Process as in claim 1, wherein the thermic drying is preformed, above 150° C. 10. Process as in claim 9, wherein the thermic drying is performed in a dryer and the humidity of the air coming out of the dryer is higher that 200 g per kg of air. 11. Process as in claim 9, wherein the thermic drying time is approximately 10 minutes. 12. Process as in claim 9, wherein the drying time is about 4 minutes. 13. Process as in claim 9, wherein the degree of hydration during thermic drying remains approximately constant. 14. Process as in claim 13, wherein the degree of hydration upon exit from the thermic drying is 30 to 60%. 15. Process for elimination of excess water contained in continuous ribbons obtained by shaping a mixture of calcium sulphate and water with a water to sulphate mixture ratio higher than 0.80, having a thickness on the order of 10 mm, comprising filtering the ribbon for 20 to 80 seconds under a vacuum of 40 to 150 mm of mercury, subjecting the ribbon for about 1 minute to a vacuum on the order of 250 mm of mercury, letting hydration develop until said ribbon is manipulable, and thermic drying to extract from 20 to 50 kg of water vapor per hour per m 2 of exchange surface to eliminate at least 95% of the excess water. 16. Process of elimination of excess water contained in continuous ribbons, obtained by shaping a mixture of calcium sulphate water with a water to sulphate ratio on the order of 0.80 to 0.90, comprising filtering to densify and diminish the thickness of the ribbon subject the ribbon to another vacuum until a water to sulphate ratio on the order of 0.45 to 0.50 is reached, letting hydration develop until the ribbon is manipulable, putting said ribbon through thermic drying in a dryer at a temperature above 150° C. until elimination of 95% of the excess water, drying is regulated so that the air coming out of the dryer has a humidity of about 300 g of water vapor per kg of air. 17. Process as in claim 7, wherein the thermic drying is stopped before the ribbon has set. 18. Process as in claim 1 wherein the thermic drying is stopped before the ribbon is completely set, said ribbon containing enough water to finish hydration. 19. Process for elimination of excess water contained in a mixture of plaster and water, comprising first eliminating excess water by suction until the water to plaster ratio is on the order of 0.45 to 0.50 and the plaster is hydrated only to the value enabling manipulation, then thermic drying and preserving at least the degree of hydration already reached, and continuing the thermic drying eliminate 95% of the excess water to thereby leave only the water necessary to continue the hydration. 20. The process of claim 1 wherein the ribbons are cut into board after said ribbons have become manipulable but before the step of thermic drying.
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