IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0355405
(2003-01-31)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
8 |
초록
▼
A method of dewatering a fiber web in a paper machine, includes the steps of: dewatering the fiber web in a forming section to a solids content of greater than approximately 10%; displacement pressing the fiber web in an air press assembly to a solids content of greater than approximately 40%; and t
A method of dewatering a fiber web in a paper machine, includes the steps of: dewatering the fiber web in a forming section to a solids content of greater than approximately 10%; displacement pressing the fiber web in an air press assembly to a solids content of greater than approximately 40%; and through air drying the fiber web in at least one air press assembly to a higher solids content.
대표청구항
▼
1. A method of dewatering a fiber web in a paper machine, comprising the steps of:dewatering the fiber web in a forming section to a solids content of greater than approximately 10%; displacement pressing the fiber web in an air press assembly to a solids content of greater than approximately 40%; a
1. A method of dewatering a fiber web in a paper machine, comprising the steps of:dewatering the fiber web in a forming section to a solids content of greater than approximately 10%; displacement pressing the fiber web in an air press assembly to a solids content of greater than approximately 40%; and through air drying the fiber web in at least one air press assembly to a higher solids content. 2. The method of dewatering a fiber web of claim 1, wherein said dewatering step results in a solids content of between approximately 10 to 30%.3. The method of dewatering a fiber web of claim 2, wherein said dewatering step results in a solids content of approximately 15%.4. The method of dewatering a fiber web of claim 1, wherein said dewatering step is carried out using a moulding fabric with a non-flat, three dimensional surface structure.5. The method of dewatering a fiber web of claim 1, including the further step of moulding the fiber web with a non-flat, three dimensional surface structure using a moulding fabric.6. The method of dewatering a fiber web of claim 5, wherein said moulding step is carried out between said dewatering step and said displacement pressing step.7. The method of dewatering a fiber web of claim 1, wherein said displacement pressing step results in a solids content of greater than approximately 45%.8. The method of dewatering a fiber web of claim 7, wherein said displacement pressing step results in a solids content of greater than approximately 50%.9. The method of dewatering a fiber web of claim 8, wherein said displacement pressing step results in a solids content of greater than approximately 60%.10. The method of dewatering a fiber web of claim 1, wherein said displacement pressing step causes the fiber web to have a non-flat, three dimensional surface structure.11. The method of dewatering a fiber web of claim 10, wherein said displacement pressing step is carried out using a moulding fabric with a non-flat, three dimensional surface structure.12. The method of dewatering a fiber web of claim 1, wherein said displacement pressing step is carried out in an air press assembly using an impermeable membrane.13. The method of dewatering a fiber web of claim 1, wherein said through air drying step is carried out by passing air through a permeable membrane and the fiber web.14. The method of dewatering a fiber web of claim 13, wherein said air press assembly used to carry out said through air drying step comprises one of a cluster press, a U-shaped box, a vented roll with a hood, and a suction roll.15. The method of dewatering a fiber web of claim 1, wherein said through air drying step is carried out with a differential pressure on opposite sides of the fiber web of greater than 2 pounds per square inch.16. The method of dewatering a fiber web of claim 15, wherein said through air drying step is carried out with a differential pressure on opposite sides of the fiber web of between approximately 5 to 50 pounds per square inch.17. The method of dewatering a fiber web of claim 1, wherein said through air drying step dewaters the fiber web at a rate of between approximately 400 to 950 kg water/m2 hr.18. The method of dewatering a fiber web of claim 1, wherein said through air drying step dewaters the fiber web to a solids content of at least approximately 80%.19. The method of dewatering a fiber web of claim 1, wherein said through air drying step includes through air drying the fiber web in a plurality of serially arranged air press assemblies, said plurality of air press assemblies being fluidly connected together in a counter current manner from a downstream air press assembly to an upstream air press assembly.20. A method of dewatering a fiber web in a paper machine, comprising the steps of:mechanically displacing water from the fiber web in a press assembly to a solids content of greater than approximately 40%; and evaporating water from the fiber web in at least one air press assembly to a higher solids content. 21. The method of dewatering a fiber web of claim 20, including the further step of moulding the fiber web with a non-flat, three dimensional surface structure using a moulding fabric.22. The method of dewatering a fiber web of claim 21, wherein said moulding step is carried out between said mechanically displacing step and said evaporating step.23. The method of dewatering a fiber web of claim 20, wherein said mechanically displacing step is carried out in an air press assembly using an impermeable membrane.24. The method of dewatering a fiber web of claim 20, wherein said evaporating step is carried out by passing air through a permeable membrane and the fiber web.25. The method of dewatering a fiber web of claim 24, wherein said air press assembly used to carry out said evaporating step comprises one of a cluster press, a U-shaped box, a vented roll with a hood, and a suction roll.26. The method of dewatering a fiber web of claim 20, wherein said evaporating step is carried out with a differential pressure on opposite sides of the fiber web of greater than 2 pounds per square inch.27. The method of dewatering a fiber web of claim 26, wherein said evaporating step is carried out with a differential pressure on opposite sides of the fiber web of between 5 to 50 pounds per square inch.28. The method of dewatering a fiber web of claim 20, wherein said evaporating step dewaters the fiber web at a rate of between approximately 400 to 950 kg water/m2 hr.29. The method of dewatering a fiber web of claim 20, wherein said evaporating step dewaters the fiber web to a solids content of at least approximately 80%.30. The method of dewatering a fiber web of claim 20, wherein said evaporating step includes through air drying the fiber web in a plurality of serially arranged air press assemblies, said plurality of air press assemblies being fluidly connected together in a counter current manner from a downstream air press assembly to an upstream air press assembly.31. A paper machine, comprising:a forming section configured for dewatering the fiber web to a solids content of greater than approximately 10%; an air press assembly configured for displacement pressing the fiber web to a solids content of greater than approximately 40%; and at least one air press assembly configured for through air drying the fiber web to a higher solids content.
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