IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0769819
(2007-06-28)
|
등록번호 |
US-7802377
(2010-10-21)
|
우선권정보 |
DE-10 2005 000 782(2005-01-05) |
발명자
/ 주소 |
- Kloibhofer, Rainer
- Haase, Christoph
- Gruber-Nadlinger, Thomas
- Boden, Herbert
- Rollenitz, Erich
- Gloser, Manfred
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
186 |
초록
▼
The invention relates to a drying cylinder which is used to dry a paper, cardboard, tissue or other web of fibrous material in a machine for the production and/or for the transformation thereof. The drying cylinder includes a support body and an external cover layer which is heated by a hot fluid. T
The invention relates to a drying cylinder which is used to dry a paper, cardboard, tissue or other web of fibrous material in a machine for the production and/or for the transformation thereof. The drying cylinder includes a support body and an external cover layer which is heated by a hot fluid. The thermal flow passing through the external cover layer is increased such that at least one cavity is provided between the support body and the external cover layer through which the fluid flows. The external cover layer is predominately so thin that the ratio formed by the thermal conductivity of the material and the thickness of the external cover layer is greater than a threshold value of 3.2 kW/m2K for steel, 30 kW/m2K for aluminum, 18 kW/m2K for bronze alloys, 3.4 kW/m2K for copper and 6.1 kW/m2K for magnesium.
대표청구항
▼
What is claimed is: 1. A drying cylinder for drying one of paper, paperboard, tissue and a fibrous web in a papermaking machine for at least one of producing and finishing the same, the drying cylinder comprising: a load bearing element; and an outer cover layer directly heated by a hot fluid flowi
What is claimed is: 1. A drying cylinder for drying one of paper, paperboard, tissue and a fibrous web in a papermaking machine for at least one of producing and finishing the same, the drying cylinder comprising: a load bearing element; and an outer cover layer directly heated by a hot fluid flowing in contact with said outer cover layer, between said load bearing element and said outer cover layer there is at least one cavity through which the hot fluid flows, at least a portion of said outer cover layer being so thin that a ratio of the thermal conductivity of the material and a thickness of said outer cover layer is greater than a limiting value, which is 3.2 kW/m2K for steel, 30 kW/m2K for aluminum, 18 kW/m2K for bronze alloys, 3.4 kW/m2K for copper and 6.1 kW/m2K for magnesium. 2. The drying cylinder of claim 1, further comprising tie rods, said outer cover layer being supported on said load bearing element by way of said tie rods. 3. The drying cylinder of claim 1, further comprising: an inner cover layer carried by said load bearing element; and a plurality of connecting elements, said inner cover layer being connected to said outer cover layer by way of said connecting elements, said at least one cavity being between said inner cover layer and said outer cover layer. 4. The drying cylinder of claim 3, wherein said connecting elements include at least one of webs and slats. 5. The drying cylinder of claim 1, wherein the hot fluid is steam, a pressure in said at least one cavity being between 1.5 and 13 bar. 6. The drying cylinder of claim 1, wherein said outer cover layer has an inner surface that is profiled. 7. The drying cylinder of claim 6, wherein said inner surface is grooved. 8. The drying cylinder of claim 2, wherein said ratio apart from said tie rods is above said limiting value. 9. The drying cylinder of claim 3, wherein said ratio apart from said connecting elements is above said limiting value. 10. The drying cylinder of claim 1, wherein said portion of said outer cover layer is at least 60% of the entire circumferential surface of said outer cover layer having said ratio that is at least on average greater than said limiting value. 11. The drying cylinder of claim 10, wherein said portion of said outer cover layer is at least 75% of the entire circumferential surface of said outer cover layer having said ratio that is at least on average greater than said limiting value. 12. The drying cylinder of claim 1, wherein said drying cylinder is in contact with a portion of the fibrous web with at least one water-absorbent belt thereover and a dense belt overlying said at least one water-absorbent belt, at least a portion of said dense belt being cooled. 13. The drying cylinder of claim 1, wherein said drying cylinder is in contact with a portion of the fibrous web with a belt thereover, the fibrous web being in contact with said drying cylinder, said belt having a tension of at least 10 kN/m. 14. The drying cylinder of claim 13, wherein said tension is at least 20 kN/m. 15. The drying cylinder of claim 13, wherein said belt is a dryer fabric. 16. A papermaking machine producing a fibrous web, the papermaking machine comprising: a drying cylinder including: a load bearing element; and an outer cover layer heated by a hot fluid, between said load bearing element and said outer cover layer there is at least one cavity through which the hot fluid flows in direct contact with said outer cover layer, at least a portion of said outer cover layer being so thin that a ratio of the thermal conductivity of the material and a thickness of said outer cover layer is greater than a limiting value, which is 3.2 kW/m2K for steel, 30 kW/m2K for aluminum, 18 kW/m2K for bronze alloys, 3.4 kW/m2K for copper and 6.1 kW/m2K for magnesium; at least one water-absorbent belt, said water-absorbent belt along with the fibrous web wrapping about a portion of said drying cylinder, the fibrous web being in contact with said drying cylinder; and a dense belt overlying said at least one water-absorbent belt about said portion of said drying cylinder, at least one portion of said dense belt being cooled. 17. A papermaking machine producing a fibrous web, the papermaking machine comprising: a drying cylinder including: a load bearing element; and an outer cover layer directly heated by a hot fluid, between said load bearing element and said outer cover layer there is at least one cavity through which the hot fluid flows, at least a portion of said outer cover layer being so thin that a ratio of the thermal conductivity of the material and a thickness of said outer cover layer is greater than a limiting value, which is 3.2 kW/m2K for steel, 30 kW/m2K for aluminum, 18 kW/m2K for bronze alloys, 3.4 kW/m2K for copper and 6.1 kW/m2K for magnesium; and a belt along with the fibrous web wrapping about a portion of said drying cylinder, the fibrous web being in contact with said drying cylinder, said belt having a tension of at least 10 kN/m. 18. The papermaking machine of claim 17, wherein said tension is at least 20 kN/m. 19. The papermaking machine of claim 17, wherein said belt is a dryer fabric.
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