Source: http://www.google.com/patents/US5810974?dq=6,073,142
Timestamp: 2015-03-06 14:21:05
Document Index: 256738542

Matched Legal Cases: ['Application No. 882312', 'Application No. 882312', 'Application No. 901633', 'Application No. 901633', 'Application No. 903916', 'Application No. 903916']

Patent US5810974 - Press section including an extended-nip press with an internally heated ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA press section in a paper machine including a compact combination of rolls which form a number of press nips with one another in which water is removed from a paper web. The paper web has a closed draw supported by a press fabric or by a roll face at least between the nips. The press section includes...http://www.google.com/patents/US5810974?utm_source=gb-gplus-sharePatent US5810974 - Press section including an extended-nip press with an internally heated center rollAdvanced Patent SearchPublication numberUS5810974 APublication typeGrantApplication numberUS 08/732,075Publication dateSep 22, 1998Filing dateOct 16, 1996Priority dateOct 20, 1995Fee statusLapsedAlso published asCA2235329A1, CN1080789C, CN1200155A, DE69631683D1, DE69631683T2, EP0868567A1, EP0868567B1, WO1997015718A1Publication number08732075, 732075, US 5810974 A, US 5810974A, US-A-5810974, US5810974 A, US5810974AInventorsJorma LaapottiOriginal AssigneeValmet CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (30), Non-Patent Citations (12), Referenced by (13), Classifications (17), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetPress section including an extended-nip press with an internally heated center roll
US 5810974 AAbstract
1. A press section in a paper machine for dewatering a web, comprisinga center roll over which the web runs, means defining at least a first nip with said center roll in which the web is dewatered, means defining an extended nip with said center roll in which the web is dewatered after said first nip in a running direction of the web, said second press nip being the last press nip defined in connection with said center roll prior to transfer of the web from said center roll, and said center roll comprisingan outer roll mantle, first loading means for producing a loading force and/or crown variation in said extended nip operative against said roll mantle, first regulation means for regulating a cross-direction compression pressure profile of said extended nip, drive means arranged in association with said roll mantle for providing rotative force to said center roll, and circulation means for circulating a heating medium through said roll mantle to heat an outer face of said roll mantle and intensify dewatering of the web in said first press nip and said extended nip, said circulation means comprisingaxial ducts arranged in and extending across substantially the entire length of said roll mantle, each of said axial ducts having an inlet end and an outlet end, end ducts arranged at a first end of said roll mantle for interconnecting said axial ducts in pairs such that said outlet end of a first one of each of said interconnected pairs of axial ducts is connected to said inlet end of a second one of each of said interconnected pairs of axial ducts via one of said end ducts, and a heating-medium flow coupling arranged at a second end of said roll mantle opposite said first end of said roll mantle for passing the heating medium into said inlet end of said first one of each of said interconnected pairs of axial ducts and drawing the heating medium directly from said outlet end of said second one of each of said interconnected pairs of axial ducts, whereby the heating medium flows into said inlet end of said first one of each of said interconnected pairs of axial ducts, through said first one of each of said interconnected pairs of axial ducts from said second end of said roll mantle to said first end of said roll mantle, through said outlet end of said first one of each of said interconnected pairs of axial ducts into a respective one of said end ducts, through said end duct into said inlet end of said respective second one of each of said interconnected pairs of axial ducts, through said second one of each of said interconnected pairs of axial ducts from said first end of said roll mantle to said second end of said roll mantle and out of said second one of each of said interconnected pairs of axial ducts through said outlet ends thereof. 2. The press section of claim 1, wherein said first press roll is arranged in relation to said center roll such that said first press nip is a sharp and short roll nip, further comprisinga first water-receiving press felt, first guide means for guiding said first water-receiving press felt to pick-up the web at an initial end of the press section and carry the web through said first press nip, the web being separated from said first water-receiving felt after said first press nip, a second water-receiving press felt, and second guide means for guiding said second water-receiving felt into contact with the web before said extended nip and out of contact with the web after said extended nip. 3. The press section of claim 1, wherein said center roll further comprisessecond loading means for producing a loading force and/or crown variation in said first press nip operative against said roll mantle, and second regulation means for regulating a cross-direction compression pressure profile of said first press nip. 4. The press section of claim 1, further comprising a second press nip arranged after said extended nip in the running direction of the web, said second press nip comprising a roll nip or an extended nip and being defined in part by a smooth-faced heated roll.
7. The press section of claim 1, further comprisingheating means other than said circulation means arranged in connection with said center roll for raising the temperature level of said outer face of said roll mantle, said heating means being selected from the group consisting of hot-water jets for spraying hot water onto said outer face on a sector of said center roll over which the web does not run, a steam box arranged to apply steam to the web at a location between said first press nip and said extended nip, and an infrared heater arranged to heat the web at a location between said first press nip and said extended nip. 8. The press section of claim 1, wherein said circulation means are structured and arranged to raise the temperature of said outer face of said roll mantle to about 60� C. to about 95� C.
9. The press section of claim 1, wherein said circulation means are structured and arranged to provide the heating medium with a temperature in the range of from about 70� C. to about 180� C.
11. The press section of claim 10, wherein said second press nip is an extended nip, further comprisinga first water-receiving press felt, and first guide means for guiding said first water-receiving press felt to pick-up the web at an initial end of the press section and carry the web through said second press nip to said first press nip. 12. The press section of claim 1, further comprising regulation means arranged in association with said center roll for regulating the surface temperature of said center roll such that transfer of the web from said center roll is facilitated.
13. The press section of claim 1, further comprisinga transfer suction roll arranged to define a transfer nip with said center roll at a location after said extended nip in the running direction of the web, and a wire arranged to run over said transfer suction roll, the web being transferred in said transfer nip from said center roll to said wire. 14. The press section of claim 1, further comprisingsupport faces for supporting the web in a closed draw in its run through the press section, and a hose roll arranged to define said extended nip with said center roll, said hose roll comprising a hose mantle and a press shoe arranged in said hose mantle and oriented in a direction toward said extended nip, said press shoe being pressed toward said center roll. 15. A press section in a paper machine for dewatering a web, comprisingfirst nip means for defining a first press nip in which the web is dewatered, said first nip means comprising first and second press rolls, extended nip means for defining an extended nip after said first nip in a running direction of the web in which the web is dewatered, said extended nip being the last press nip in the press section, the web being guided in a closed draw from said first press nip to said extended nip, and said extended nip means comprising a heated roll includingan outer roll mantle, first loading means for producing a loading force and/or crown variation in said extended nip operative against said roll mantle, first regulation means for regulating a cross-direction compression pressure profile of said extended nip, drive means arranged in association with said roll mantle for providing rotative force to said heated roll, and circulation means for circulating a heating medium through said roll mantle to heat an outer face of said roll mantle and intensify dewatering of the web in said extended nip, said circulation means comprisingaxial ducts arranged in and extending across substantially the entire length of said roll mantle, each of said axial ducts having an inlet end and an outlet end, end ducts arranged at a first end of said roll mantle for interconnecting said axial ducts in pairs such that said outlet end of a first one of each of said interconnected pairs of axial ducts is connected to said inlet end of a second one of each of said interconnected pairs of axial ducts via one of said end ducts, and a heating-medium flow coupling arranged at a second end of said roll mantle opposite said first end of said roll mantle for passing the heating medium into said inlet end of said first one of each of said interconnected pairs of axial ducts and drawing the heating medium directly from said outlet end of said second one of each of said interconnected pairs of axial ducts, whereby the heating medium flows into said inlet end of said first one of each of said interconnected pairs of axial ducts, through said first one of each of said interconnected pairs of axial ducts from said second end of said roll mantle to said first end of said roll mantle, through said outlet end of said first one of each of said interconnected pairs of axial ducts into a respective one of said end ducts, through said end ducts into said inlet end of said respective second one of each of said interconnected pairs of axial ducts, through said second one of each of said interconnected pairs of axial ducts from said first end of said roll mantle to said second end of said roll mantle and out of said second one of each of said interconnected pairs of axial ducts through said outlet ends thereof. 16. The press section of claim 15, further comprising second nip means for defining a second press nip after said first press nip and before said extended nip in the running direction of the web, said second press nip constituting a pre-roll nip and comprising a press roll arranged in nip-defining relationship with said heated roll.
17. The press section of claim 15, wherein said first press nip is an extended nip and said extended nip means comprises third and fourth rolls, said third roll constituting said heated roll, further comprisinga first fabric, first guide means for guiding said first fabric to pick-up the web at an initial end of the press section and carry the web on a lower face of said first fabric through said first press nip, a second fabric constituting a press felt or transfer belt, second guide means for guiding said second fabric through said first press nip on an upper face of said second fabric, the web being transferred from said first fabric to said second fabric in said first press nip and being carried on said second fabric after said first press nip, a third fabric, and third guide means for guiding said third fabric to receive the web from said second fabric after said first press nip and carry the web into said extended nip on a lower face of said third fabric. 18. The press section of claim 15, further comprising regulation means arranged in association with said heated roll for regulating the surface temperature of said heated roll such that transfer of the web from said heated roll is facilitated.
19. The press section of claim 15, further comprisingsupport faces for supporting the web in a closed draw in its run through the press section, and a hose roll arranged to define said extended nip with said heated roll, said hose roll comprising a hose mantle and a press shoe arranged in said hose mantle and oriented in a direction toward said extended nip, said press shoe being pressed toward said heated roll. 20. A press section in a paper machine for dewatering a web, comprisinga center roll over which the web runs, means defining at least a first nip with said center roll in which the web is dewatered, means defining an extended nip with said center roll in which the web is dewatered after said first nip in a running direction of the web, said second press nip being the last press nip defined in connection with said center roll prior to transfer of the web from said center roll, and said center roll comprising an outer roll mantle, an axle journal arranged at a first end of said roll mantle and circulation means for circulating a heating medium through said roll mantle to heat an outer face of said roll mantle and intensify dewatering of the web in said first press nip and said extended nip, said circulation means comprisingaxial ducts arranged in and extending across substantially the entire length of said roll mantle, end ducts arranged at a second end of said roll mantle opposite to said first end for interconnecting said axial ducts in pairs via one of said end ducts and such that the heating medium flows from said first end of said roll mantle through a first one of each of said pairs of axial ducts to said second end of said roll mantle, through a respective one of said end ducts and from said second end of said roll mantle to said first end of said roll mantle through a respective second one of each of said pairs of axial ducts, and a heating-medium flow coupling arranged at said first end of said roll mantle for passing the heating medium into said first one of each of said pairs of axial ducts and drawing the heating medium from said second one of each of said pairs of axial ducts, said heating-medium, flow coupling having a housing arranged entirely around said axle journal and defining spaces through which the heating medium flows. 21. The press section of claim 20, wherein said heat-medium flow coupling comprises first and second separated annular spaces extending around said axle journal, said first annular space being connected to said first one of each of said pairs of axial ducts and said second annular space being connected to said second one of each of said pairs of axial ducts.
25. A press section in a paper machine for dewatering a web, comprisinga center roll over which the web runs, means defining at least a first nip with said center roll in which the web is dewatered, means defining an extended nip with said center roll in which the web is dewatered after said first nip in a running direction of the web, said second press nip being the last press nip defined in connection with said center roll prior to transfer of the web from said center roll, and said center roll comprising an outer roll mantle, end pieces arranged at each end of said roll mantle and circulation means for circulating a heating medium through said roll mantle to heat an outer face of said roll mantle and intensify dewatering of the web in said first press nip and said extended nip, each of said end pieces including an axle journal revolving supported on bearing means, said circulation means comprisingaxial ducts arranged in and extending across substantially the entire length of said roll mantle, end ducts arranged at a first end of said roll mantle for interconnecting said axial ducts in pairs via one of said end ducts and such that the heating medium flows from said first end of said roll mantle through a first one of each of said pairs of axial ducts to a second end of said roll mantle opposite to said first end of said roll mantle, through a respective one of said end ducts and from said second end of said roll mantle to said first end of said roll mantle through a respective second one of each of said pairs of axial ducts, a first one of said axle journals including a central flow duct arranged in flow communication with said first one of each of said pairs of axial ducts and axial journal ducts each arranged in flow communication with at least one of said second one of each of said pairs of axial ducts, and a heating-medium flow coupling connected to said first axle journal for passing the heating medium into said central flow duct to be passed into said first one of each of said pairs of axial ducts and drawing the heating medium from said axial journal ducts and thus from said second one of each of said pairs of axial ducts. 26. The press section of claim 25, wherein said first axle journal further comprises a first set of radial ducts for coupling said central flow duct to said first one of each of said pairs of axial ducts and a second set of radial ducts, each coupling one of said axial journal ducts to one of said second one of each of said pairs of axial ducts.
29. A press section in a paper machine for dewatering a web, comprisinga center roll over which the web runs, means defining at least a first nip with said center roll in which the web is dewatered, and means defining an extended nip with said center roll in which the web is dewatered after said first nip in a running direction of the web, said second press nip being the last press nip defined in connection with said center roll prior to transfer of the web from said center roll; said center roll comprising:an outer roll mantle, circulation means for circulating a heating medium through said roll mantle to heat an outer face of said roll mantle and intensify dewatering of the web in said first press nip and said extended nip, first loading means for producing a loading force and/or crown variation in said extended nip operative against said roll mantle, first regulation means for regulating a cross-direction compression pressure profile of said extended nip, second loading means for producing a loading force and/or crown variation in said first press nip operative against said roll mantle, and second regulation means for regulating a cross-direction compression pressure profile of said first press nip, and drive means arranged in association with said first end of said roll mantle for providing rotative force to said center roll; said circulation means comprisingaxial ducts arranged in and extending across substantially the entire length of said roll mantle, end ducts arranged at a first end of said roll mantle for interconnecting said axial ducts in pairs such that the heating medium follows from a second end of said roll mantle opposite to said first end through a first one of each of said pairs of axial ducts, through a respective one of said end ducts and from said first end of said roll mantle to said second end through a respective second one of each of said pairs of axial ducts, and a heating-medium flow coupling arranged at said second end of said roll mantle for passing the heating medium into said first one of each of said pairs of axial ducts and drawing the heating medium from said second one of each of said pairs of axial ducts. Description
In the prior art, various closed and compact press sections are known, in which there are several press nips formed between press rolls, between which nips the web has a closed draw. Of these press sections, the press section marketed by the current assignee with the product names "Sym-Press II"� and "Sym-Press O"� should be mentioned. In these presses, there are three successive roll nips in connection with a compact combination of rolls. If necessary, these press sections can be provided with a fourth, separate press nip.
Also known from the prior art for the dewatering of a paper web, there are the hot pressing devices proper, in which so-called impulse drying is used. In this mode of drying, the web is passed into connection with a face, usually a roll face, whose surface temperature is of an order of from about 150� C. to about 500� C. It is also known from the prior art to use a combination of impulse drying and an extended-nip zone, with respect to which reference is made to International Patent WO 95/21962 in the name of Beloit Technologies Inc. (publication date of Aug. 17, 1995). In the arrangement described in this publication, the paper web is pressed against a roll which has been heated to a temperature of from about 150� C. to about 500� C. in an extended-nip zone. The heating of the roll is carried out in particular by means of induction heating, and the purpose of the press device is to increase the dry solids content of the web by about 10 to about 15 percentage units and to reach dry solids contents as high as up to about 65% to about 75%.
In the invention, by means of extended-nip pressing and by means of a heated press roll operating in its connection, in particular by means of the center roll of a closed press section, synergistic effects are obtained. This synergy is based in part on the fact that, in a press section in accordance with the invention, good thermal conductivity is obtained between the paper web that is pressed and the heated roll face, and in such a case, the wet paper web can be made to bind an abundance of energy. Thus, the temperature of the paper web that is pressed can be raised sufficiently, and this raised temperature level will be effective in the extended nip for a sufficiently long period of time and over a sufficiently long distance. In this manner, the operation of the press is intensified substantially. However, in the present invention, hot pressing and impulse drying proper are not concerned, for the heated roll face is preferably heated to a temperature lower than 100� C., ideally to a temperature in the range of from about 60� C. to about 95� C. In exceptional cases, it is also possible to use a roll face which has been heated to a temperature slightly higher than 100� C., in particular when, besides the circulation of a heating medium in the hot roll, other, outside or external devices for heating the web are used (i.e., other than by means of the center roll itself), such as a steam box, hot-water jets, and/or equivalent.
After the roll nip N2, the web W follows the smooth face 21' of the center roll 20 into the third press nip, which is, according to the invention, expressly an extended nip NP1 and is thus passed as a closed draw between the nips N2 and NP1. A water-receiving press felt 32 runs through the extended-nip zone NP1 and is guided by suitable guide means therethrough such as guide rolls 38. The extended-nip zone NP1 is formed by the extended-nip roll 30, together with the heated center roll 20. The extended-nip roll 30 is, for example, an extended-nip roll provided with a hose or glide-belt mantle 31 in which there is a press shoe 33 at the press zone NP1. It is possible that the pressure effect of the press shoe can be profiled in the cross direction. As the extended-nip roll 30 in the extended nip NP1 as shown in FIG. 1, favorably an extended-nip roll of the type marketed by the current assignee with the trade mark "Sym-Belt S"� is used, in which the glide-belt mantle 31 is attached to tightly journalled end rings. With respect to the details of the construction and operation of a "Sym-Belt S" roll, reference is made to the current assignee's patents, viz., Finnish Patent No. 70,952 (which corresponds to U.S. Pat. No. 4,568,423 incorporated by reference herein) and European Patent Nos. 0 345 500 and 0 527 881.
The mantle 21 of the center roll 20 can be coated and as such a coating on the mantle 21 of the center roll 20, for example, a suitable ceramic coating or a tungsten carbide metal alloy is used. Owing to efficient transfer of heat, there is a risk of cracking of the coating because of a thermal shock. In order to avoid this, it is preferable to restrict the flow of heat from the interior of the roll mantle 21 to the outer face 21' so that the temperature Tf of the heating medium is selected to be as low as about 110� C. and, if necessary, additional thermal energy is passed to the face of the mantle by means of the hot-water/steam lubrication jets 19 of the doctors 18 and/or by means of a heater 17. In this manner, the temperature TS of the outer face 21' of the mantle 21 of the heated center roll 20 can be made sufficiently high. Generally, the temperature TS is selected in the range of from about 60� C. to about 95� C., preferably in a range from about 70� C. to about 85� C., with which temperature a particularly efficient dewatering is accomplished in the extended nip NP1. In exceptional circumstances, the temperature level TS can be raised slightly above 100� C., in particular when auxiliary heating devices are used in connection with the roll face, such as water jets 19 and/or a steam box 17.
FIG. 7 shows a press section in accordance with a second particular embodiment of the invention, which differs substantially from those described above and in which two separate extended-nip zones NP12 and NP22 are used. After the first extended nip NP12, the web W follows the lower fabric, which is preferably a smooth-faced transfer belt 15B substantially water-non-receiving or a water-receiving press felt. The transfer of the web W onto the lower fabric 15B can be aided by means of a suction device 15c, such as a suction shoe or a suction roll. On the transfer belt 15B or equivalent, the web W is transferred onto an upper felt 65 of the second extended nip NP22 by means of a suction zone 64a of a transfer suction roll 64, after which the web W is passed on the lower face of the upper felt 65 into the second extended-nip zone NP22. The maintenance of the web W on the lower face of the upper felt 65 is ensured by means of vacuum boxes or blow-suction boxes 68. The upper roll of this extended-nip zone NP22 is an extended-nip roll 63 provided with a hose mantle 63', which roll 63 includes a series of press-glide shoes 69 extending in a direction transverse to the running direction of the web, i.e., across the width of the web. The lower roll in the second extended-nip zone NP22 is, in accordance with the second particular embodiment of the invention, a heated roll 20B having a mantle which can be arranged to be heated similarly to the mantles of the center rolls 20,20A in the press sections described above. The temperature level of the roll 20B is generally raised to a range of TS from about 65� C. to about 95� C., preferably TS is from about 70� C. to about 85� C., whereby the dewatering is promoted and intensified in the latter extended nip NP22 formed by the heated roll 20B.
Regulation means are arranged in association with the center roll 20 for regulating the surface temperature of the center roll 20, e.g., such that separation of the web from the center roll is facilitated. These regulation means may comprise means for controlling the temperature of the heating medium (schematically represented by the box 100 connecting to line Fin). The temperature Tf of the heating medium circulating in the flow ducts 22, such as oil, water or water steam, is usually selected in the range of from about 70� C. to about 180� C., preferably from about 90� C. to about 140� C.
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Steiner, Wochenblatt fur Papierfabrikation, vol. 5, 1988.* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS6004429 *Dec 22, 1997Dec 21, 1999Voith Sulzer Papiermaschinen GmbhMachine and method for producing a fibrous creped webUS6083349 *Dec 23, 1997Jul 4, 2000Voith Sulzer Papiermaschinen GmbhMachine and method for manufacturing a creped fibrous pulp web, with a shoe pre-press and a main shoe pressUS6153055 *Apr 7, 1998Nov 28, 2000Beloit Technologies, Inc.Apparatus for assisting in the release of a webUS6161303 *Sep 30, 1999Dec 19, 2000Voith Sulzer Papiertechnik Patent GmbhPressing apparatus having chamber end sealingUS6454905 *Apr 2, 2001Sep 24, 2002Sca Hygiene Products AbImpulse dried; toilet paperUS6513425 *May 5, 2000Feb 4, 2003Metso Paper Karlstad AbHeater section provided with at least one distance control means arranged for being in contact with shell surface during heating and for automatically regulating distance from heater to shell axisUS6585366 *Aug 3, 1999Jul 1, 2003Canon Kabushiki KaishaImage forming methodUS7678234 *Oct 18, 2006Mar 16, 2010Metso Paper, Inc.Dewatering arrangement on the press section of a web-forming machineUS8349138 *May 18, 2010Jan 8, 2013Andritz AgDevice for treating a pulp web in an extended nip pressing unitUS20100300635 *May 18, 2010Dec 2, 2010Wilhelm MausserProcess and device for treating a pulp web in an extended nip pressing unitUS20120055644 *Apr 9, 2010Mar 8, 2012Wilhelm MausserApparatus and method for treating a fibrous material web in a long nip press unitWO2006114351A1 *Mar 15, 2006Nov 2, 2006Voith Patent GmbhMethod for the production of a web of paper, especially rotogravure paperWO2007003504A1 *Jun 20, 2006Jan 11, 2007Voith Patent GmbhMethod for the production of a paper web, especially rotogravure paper* Cited by examinerClassifications U.S. Classification162/358.5, 492/46, 162/206, 162/359.1International ClassificationD21F3/04, D21G1/02, D21F3/02Cooperative ClassificationD21F3/0218, D21F3/04, D21F3/0281, D21G1/0266, D21F3/045European ClassificationD21G1/02H4, D21F3/02D, D21F3/04, D21F3/04B, D21F3/02B2Legal EventsDateCodeEventDescriptionNov 9, 2010FPExpired due to failure to pay maintenance feeEffective date: 20100922Sep 22, 2010LAPSLapse for failure to pay maintenance feesApr 26, 2010REMIMaintenance fee reminder mailedMar 16, 2006FPAYFee paymentYear of fee payment: 8Mar 5, 2002FPAYFee paymentYear of fee payment: 4Oct 16, 1996ASAssignmentOwner name: VALMET CORPORATION, FINLANDFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LAAPOTTI, JORMA;REEL/FRAME:008286/0649Effective date: 19960930RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services