US3874997A - Multiple cylinder drier in a paper machine - Google Patents

Multiple cylinder drier in a paper machine Download PDF

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US3874997A
US3874997A US34346973A US3874997A US 3874997 A US3874997 A US 3874997A US 34346973 A US34346973 A US 34346973A US 3874997 A US3874997 A US 3874997A
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drying
paper
wire
web
suction
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Matti Kankaanpaa
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Valmet-Dominion Inc
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Valmet Oy
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00Dryer section of machines for making continuous webs of paper
    • D21F5/02Drying on cylinders

Abstract

An improvement in the multiple cylinder drier unit of a paper making machine, each drying group of which consists of a number of driers disposed in two rows, one above the other, and lapped by the paper web running through the group in zigzag fashion, supported by a drying wire. The suggested improvement is particularly characterized in that the driers in one row of the drying group are permeable to air and that the multiple cylinder drier also comprises additional driers for creating differential pressures on both sides of the paper web, whereby passage of air through the web is achieved, with the web pressed into contact with the drying wire. According to further, optional features of the invention, the drying means permeable to air are cylindrically shaped drying cylinders, or they consist of a suction chamber substantially confined by the drying wire moving on a support of guiding rolls. In addition, hot air blowing hoods may be arranged around the drying means permeable to air and, within them, suction chambers. The paper web arriving from the press section of the paper machine may be arranged to be attached to the drying wire by the aid of suction means exerting suction through this wire.

Description

Kankaanpaa 1 Apr. 1,1975

[ MULTIPLE CYLINDER DRIER IN A PAPER [56] References Cited UNITED STATES PATENTS 1,615,210 1/1927 Astcn 34/116X 1,767,889 6/1930 .lurgensen 162/290 X 1,844,658 2/1932 Holcomb 34/159 2,091,805 8/1937 Chuse 162/290 X 3,318,017 5/1967 Smith, Jr 34/116 3,320,675 5/1967 Chaikin et al. 34/115 X 3,576,078 4/1971 Holt 34/159 X 3,671,389 6/1972 Wahlstrom et al, 162/306 3,685,167 8/1972 Loveday et a1. 34/155 X 3,733,711 5/1973 Haythornethwaite 34/155 X 3,816,941 6/1974 Hulik et a1, 162/207 X Primary E.\'uminerRobert L. Lindsay, Jr. Assistant Examiner-Richard V. Fisher Attorney, Agent, or FirmRichards & Geier [57] ABSTRACT An improvement in the multiple cylinder drier unit of a paper making machine, each drying group of which consists of a number of driers disposed in two rows, one above the other, and lapped by the paper web running through the group in zigzag fashion, supported by a drying wire. The suggested improvement is particularly characterized in that the driers in one row of the drying group are permeable to air and that the multiple cylinder drier also comprises additional driers for creating differential pressures on both sides of the paper web, whereby passage of air through the web is achieved, with the web pressed into contact with the drying wire.

According to further, optional features of the invention, the drying means permeable to air are cylindrically shaped drying cylinders, or they consist of a suction chamber substantially confined by the drying wire moving on a support of guiding rolls. in addition, hot air blowing hoods may be arranged around the drying means permeable to air and, within them, suction chambers. The paper web arriving from the press section of the paper machine may be arranged to be attached to the drying wire by the aid of suction means exerting suction through this wire.

MULTIPLE CYLINDER DRIER IN A PAPER MACHINE The present invention concerns, in a paper making machine, a multiple cylinder drier having one or several drying groups or drying sections composed of drying means disposed in two rows, one above the other, over which the paper web travels along a zigzag path from one row to the other, through the group and is supported by a drying wire permeable to air. In multiple cylinder driers of this kind, all drying means have previously been so constructed that the drying has taken place according to the contact drying method. As a result, the efficiency of the drier has not been as high as it could be. Since paper machines are nowadays run at high speed and the speed is increased all the time, the multiple cylinder drier is required to be more efficient in order that a desired degree of drying of the paper web might be achieved. Consequently, the multiple cylinder drier has to be very large indeed, which has its own drawbacks.

The object of the present invention is to provide a more efficient multiple cylinder drier, in order that the above-mentioned drawback could be eliminated. The invention is characterized in that in a multiple cylinder drier of the kind described the drying means of one row are permeable to air and that the multiple cylinder drier also comprises means for creating differential pressures on both sides of the paper web, whereby the drying air can be made to pass through the paper web, while this paper web is urged into contact with the drying wire. Since the multiple cylinder drier according to the invention has alternating contact drying means and perfusion drying means, the advantages of the contact drying method and of the perfusion drying method can be combined. It follows that the drying efficiency of a multiple cylinder drier according to the invention is considerably superior to that of multiple cylinder driers of prior art.

The drying means permeable to air may be cylinders permeable to air such as those provided with a cylinder mantle. The drying means permeable to air may also consist of suction chambers substantially confined by the drying wire, moving on the support of guiding rolls. In order to create differential pressures, around the drying means permeable to air a hot air blowing hood may be arranged, and inside it a suction chamber.

The invention is more thoroughly described with reference to the embodiment examples presented in the attached drawings.

In the drawing,

FIG. 1 shows schematically a multiple cylinder drier according to an embodiment example of the invention, in elevational view.

FIG. 2 shows a multiple cylinder drier according to another embodiment example of the invention, similarly in schematical presentation and in elevational view.

In the multiple cylinder drier of FIG. 1 the drying means have been disposed, interspaced, in two rows one above the other. The drying means in the lower row are conventional heatable drying cylinders 30, 3b. Each drying means in the upper row comprises suction rolls 4 and guiding rolls 6 disposed between these, and which constitute a curved path, along which the drying wire permeable to air travels. The drying wire consists most appropriately of a plastic wire or equivalent, which does not take up water. Over the curved path a heavy-duty hot air drying hood 7 has been fitted, and under it, within the curved part, a suction chamber 8. In addition, there are means for conducting the paper web to the multiple cylinder drier. These means consist of a suction roll 1, followed by a suction box 2.

The paper web 9 arriving from the press section of the paper machine is drawn against the drying wire 5 by the use of the suction roll 1, and its attachment to this wire is aided by the suction box 2. Subsequently, the paper web 9 travels, impacted between the drying cylinder 30 and the drying wire 5, up to the press nip 3a/4 defined by the drying cylinder 3a and the suction roll 4. Since the roll 4 is a suction roll, the paper web 9 follows along with the drying wire 5 in the passage of this wire along the curved path defined by the guiding rolls 6. Here, the paper web 9 is urged against the drying wire by differential pressure created by the hot air drying hood 7 above the curved path and the suction chamber 8 within the curved path, and the drying air flows'through the paper web 9 and drying wire 5. Since another suction roll 4 has been placed at the end of the curved path, the paper web 9 is transferred to the second drying cylinder 3b. From this drying cylinder 3b the paper web 9 continues to another curved drying means of the kind described (not shown in its entirety). The drawing also shows blowing devices 11a and 11b used to blow hot air into the hoods 7 to produce pressure which is higher than atmospheric pressure. Suction means 12a and 12b are used to produce a vacuum in the suction chambers 8, while suction means 126 produce vacuum in the suction box 2. The walls of the hoods 7, suction chambers 8 and suction box 2 are indicated by the numeral 14 in the drawing, while sealing strips associated with these walls are indicated by the numeral 13.

In the embodiment example of FIG. 2 the drying means are likewise arranged in two rows, one above the other, interspaced with each other. The drying wire 5 runs along a zigzag path over the,said drying means, from one row to the other. The drying means in the lower row are conventional heatable drying cylinders 3a, 3b, 3c, etc. The drying means in the upper row are drying cylinders 10a, 10b, etc. permeable to air. As has been said above, the drying wire 5 travels together with the paper web along a zigzag path from one row to the other. Similarly as in the preceding embodiment, in this design, too, and for the same reasons, heavy-duty hot air blowing hoods 7 and suction chambers 8 have been provided. From the drawing it is understood that impingement drying is effected in the region of the blowing hoods 7. For conduction of the paper web 9 from the press section to the drying cylinder 3a, a suction roll 1 and suction box 2 have been provided as in the preceding embodiment example. The paper web travels over the drying cylinders 3a, 3b and 3c in the lower row, pressed against them by the drying wire 5. In its travel over the drying cylinders 10a and 10b, permeable to air, in the upper row, the paper web 9 is urged against the drying wire 5 by effect of the hot air drying hood 7 and the suction chamber 8. In addition to blowing devices 11a and 11b, FIG. 2 also shows a blowing device applied to the third hood 7.

In both embodiment examples presented in the foregoing, the paper web is alternatingly subjected to contact drying and to perfusion drying. This results in a faster drying of the paper web than in prior art.

The invention is by no means confined merely to the embodiment examples presented here; these may rather be modified in many ways within the scope of the invention.

I claim:

1. In a paper machine, a dryer assembly for the drying of a paper web, comprising a row of drying cylinders rotatable about their horizontal axes; perfusion drying means disposed at a vertical distance from the row of drying cylinders and located between said drying cylinders in their interstices; a drying wire permeable to air, the paper web traveling in contact with and supported by said wire from the beginning to the end of the dryer assembly all the way zigzagging from the preceding drying cylinder to the next perfusion drying means, the paper web being disposed on that side of the drying wire where, when running upon a drying cylinder, the paper web is interposed between the drying wire and the mantle surface of the drying cylinder so that hereby, the drying of the paper web by contact drying takes place; said perfusion drying means further comprising, on the side facing the drying wire and adjacent to it, a hot air blowing hood, and on the other side of the drying wire and paper web opposite thereto, a suction chamber extending and limited to the entire joint run of web and wire from one drying cylinder to the next, so that perfusion drying of the paper web takes place substantially on the whole distance of travel ofthe paper web from the preceding to the next drying cylinder, and so that drying furthermore takes place by impingement drying in the region of the blowing hood; a suction roll at the beginning of the dryer assembly and at a vertical distance from the first drying cylinder so that, by means of said suction roll, the paper web is transferred to be supported by the drying wire; a joint run of the paper web and drying wire between said suction roll and first drying cylinder; a suction box on said joint run on the side facing the drying wire, the effect of the vacuum in this suction box being used to make the paper web adhere to the drying wire.

2. Dryer assembly according to claim 1, wherein the perfusion drying means comprise a plurality of guiding rolls, the axes of which lie on a curved surface between mutually adjacent drying cylinders, and whereby, under guidance of said guiding rolls, the drying wire travels from one row of drying cylinders to the next row, the perfusion drying means further comprising, adjacent to the outermost guiding rolls, a wall which, together with the drying wire guided by the guiding rolls, confines and encloses said suction chamber.

3. Dryer assembly according to claim 2, wherein the outermost guiding rolls are suction rolls and are so placed to define a press nip together with the drying cylinders adjacent to them.

4. Dryer assembly according to claim 1, wherein the perfusion drying means comprises a row of cylinders permeable to air and rotatable about their horizontal axes, said row being disposed at a vertical distance from the row of drying cylinders and said hot air blowing hood covering said permeable-to-air cylinders on a sector of substantially and a confining wall located adjacent to the plane defined by the row of drying cylinders and which, together with the runs of the drying wire between the drying cylinders and the cylinder permeable to air, confine and enclose said suction chamber.

Claims (4)

1. In a paper machine, a dryer assembly for the drying of a paper web, comprising a row of drying cylinders rotatable about their horizontal axes; perfusion drying means disposed at a vertical distance from the row of drying cylinders and located between said drying cylinders in their interstices; a drying wire permeable to air, the paper web traveling in contact with and supported by said wire from the beginning to the end of the dryer assembly all the way zigzagging from the preceding drying cylinder to the next perfusion drying means, the paper web being disposed on that side of the drying wire where, when running upon a drying cylinder, the paper web is interposed between the drying wire and the mantle surface of the drying cylinder so that hereby, the drying of the paper web by contact drying takes place; said perfusion drying means further comprising, on the side facing the drying wire and adjacent to it, a hot air blowing hood, and on the other side of the drying wire and paper web opposite thereto, a suction chamber extending and limited to the entire joint run of web and wire from one drying cylinder to the next, so that perfusion drying of the paper web takes place substantially on the whole distance of travel of the paper web from the preceding to the next drying cylinder, and so that drying furthermore takes place by impingement drying in the region of the blowing hood; a suction roll at the beginning of the dryer assembly and at a vertical distance from the first drying cylinder so that, by means of said suction roll, the paper web is transferred to be supported by the drying wire; a joint run of the paper web and drying wire between said suction roll and first drying cylinder; a suction box on said joint run on the side facing the drying wire, the effect of the vacuum in this suction box being used to make the paper web adhere to the drying wire.
2. Dryer assembly according to claim 1, wherein the perfusion drying means comprise a plurality of guiding rolls, the axes of which lie on a curved surface between mutually adjacent drying cylinders, and whereby, under guidance of said guiding rolls, the drying wire travels from one row of drying cylinders to the next row, the perfusion drying means further comprising, adjacent to the outermost guiding rolls, a wall which, together with the drying wire guided by the guiding rolls, confines and encloses said suction chamber.
3. Dryer assembly according to claim 2, wherein the outermost guiding rolls are suction rolls and are so placed to define a press nip together with the drying cylinders adjacent to them.
4. Dryer assembly according to claim 1, wherein the perfusion drying means comprises a row of cylinders permeable to air and rotatable about their horizontal axes, said Row being disposed at a vertical distance from the row of drying cylinders and said hot air blowing hood covering said permeable-to-air cylinders on a sector of substantially 180*, and a confining wall located adjacent to the plane defined by the row of drying cylinders and which, together with the runs of the drying wire between the drying cylinders and the cylinder permeable to air, confine and enclose said suction chamber.
US3874997A 1973-03-21 1973-03-21 Multiple cylinder drier in a paper machine Expired - Lifetime US3874997A (en)

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Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000035A (en) * 1973-05-10 1976-12-28 J. M. Voith Gmbh Machine for drying webs, including suction and heat-contact cylinders
US4033049A (en) * 1973-12-22 1977-07-05 J. M. Voith Gmbh Apparatus for changing the moisture content of paper webs or the like
US4036684A (en) * 1975-08-04 1977-07-19 Beloit Corporation High bulk tissue forming and drying apparatus
US4064637A (en) * 1975-03-19 1977-12-27 Ab Svenska Flaktfabriken Cylinder dryer for paper machines
FR2357685A1 (en) * 1976-07-05 1978-02-03 Valmet Oy Method to ensure the clamp guide the paper web in the initial part of the drying section of a paper machine
DE2813933A1 (en) * 1977-04-04 1978-10-12 Valmet Oy A method for guiding a web in the drying section of a paper machine drying cylinder group and for performing the method
WO1982002938A1 (en) * 1981-02-17 1982-09-02 Co Weyerhaeuser A vacuum box for use in high speed papermaking
WO1982002937A1 (en) * 1981-02-17 1982-09-02 Co Weyerhaeuser High speed paper drying
US4361466A (en) * 1977-10-27 1982-11-30 Beloit Corporation Air impingement web drying method and apparatus
US4441263A (en) * 1979-11-20 1984-04-10 Valmet Oy Device in the drying section of a paper machine
JPS59150195A (en) * 1983-02-07 1984-08-28 Valmet Oy Method and constitution for guiding paper web to drying partfrom press zone of papermaking machine
DE3344217A1 (en) * 1983-12-07 1985-06-20 Voith Gmbh J M An apparatus for transferring a paper web from the press section to the dryer section of a paper machine
US4551203A (en) * 1984-04-02 1985-11-05 Valmet Oy Method and arrangement for guiding a paper web from the press section to the drying section
US4716660A (en) * 1986-04-03 1988-01-05 Hercules Incorporated Unifelt air suction system
US4768294A (en) * 1985-12-17 1988-09-06 J. M. Voith, Gmbh Device for transferring a paper or board web from the press section to the dryer section of a paper machine
EP0321986A2 (en) * 1987-12-23 1989-06-28 Oy Tampella Ab Drying section in a paper making machine
US4875976A (en) * 1988-09-27 1989-10-24 Beloit Corporation Transfer apparatus from press section to drying section
WO1990001085A1 (en) * 1988-07-22 1990-02-08 Beloit Corporation A dryer apparatus for drying a web
US4967489A (en) * 1988-12-14 1990-11-06 Valmet Paper Machinery Inc. Multi-cylinder dryer with twin-wire draw and web transfer between the cylinder groups
DE4012421A1 (en) * 1990-04-19 1991-10-24 Voith Gmbh J M Paper-making drying section in paper making machine - has compressed air directed at free side of the web in a free path to reduce shrinkage unevenness
US5101577A (en) * 1987-02-13 1992-04-07 Beloit Corporation Web transfer apparatus
US5241760A (en) * 1987-02-13 1993-09-07 Beloit Technologies, Inc. Dryer apparatus
US5336373A (en) * 1992-12-29 1994-08-09 Scott Paper Company Method for making a strong, bulky, absorbent paper sheet using restrained can drying
EP0620313A2 (en) 1993-03-22 1994-10-19 Valmet Paper Machinery Inc. Drying method and drying module, as well as dryer sections that make use of same, in particular for a high-speed paper machine
US5426535A (en) * 1993-07-29 1995-06-20 Eastman Kodak Company Apparatus for removing air from between a master magnetic medium and a slave magnetic medium preceding anhysteretic transfer of signals from master to slave
US5507104A (en) * 1987-02-13 1996-04-16 Beloit Technologies, Inc. Web drying apparatus
US5522151A (en) * 1995-01-27 1996-06-04 Beloit Technologies, Inc. Single tier dryer section with dual reversing rolls
WO1996023102A1 (en) * 1995-01-27 1996-08-01 Beloit Technologies, Inc. Papermaking dryer with multi-roll vacuum chamber
US5542193A (en) * 1992-04-24 1996-08-06 Beloit Technologies, Inc. Dryer group for curl control
US5600898A (en) * 1995-09-12 1997-02-11 Beloit Technologies, Inc. Curl control by dryer aircaps in top felted dryer section
US5637195A (en) * 1995-03-23 1997-06-10 Westvaco Corporation Method to reduce off-taste and/or odor from hygienic paper packages
DE19651191A1 (en) * 1996-12-10 1998-06-18 Voith Sulzer Papiermasch Gmbh Papermaking machine drying section
US5792318A (en) * 1996-11-18 1998-08-11 Mancini; Ralph Method to stabilize sheet between press section and dryer section of a paper-making machine
US5832625A (en) * 1987-02-13 1998-11-10 Beloit Technologies, Inc. Apparatus for drying a web
US5865955A (en) * 1995-04-10 1999-02-02 Valmet Corporation Method and device for enhancing the run of a paper web in a paper machine
US5884415A (en) * 1992-04-24 1999-03-23 Beloit Technologies, Inc. Paper making machine providing curl control
US6004430A (en) * 1995-10-04 1999-12-21 Ilvespaa; Heikki Method and device for enhancing the run of a paper web in a paper machine
US6049999A (en) * 1987-02-13 2000-04-18 Beloit Technologies, Inc. Machine and process for the restrained drying of a paper web
US6154981A (en) * 1998-04-30 2000-12-05 Valmet Corporation Method and apparatus for improving the drying capacity of a hood covering a yankee cylinder
US6260287B1 (en) * 1997-08-08 2001-07-17 Raffaele Mancini Wet web stability method and apparatus
US6442865B1 (en) 1999-07-27 2002-09-03 Voith Sulzer Papiertechnik Patent Gmbh Drying section
US20070245589A1 (en) * 2006-04-19 2007-10-25 Metso Paper, Inc. Runnability of Web in a Material Web Machine

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Cited By (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000035A (en) * 1973-05-10 1976-12-28 J. M. Voith Gmbh Machine for drying webs, including suction and heat-contact cylinders
US4033049A (en) * 1973-12-22 1977-07-05 J. M. Voith Gmbh Apparatus for changing the moisture content of paper webs or the like
US4064637A (en) * 1975-03-19 1977-12-27 Ab Svenska Flaktfabriken Cylinder dryer for paper machines
US4036684A (en) * 1975-08-04 1977-07-19 Beloit Corporation High bulk tissue forming and drying apparatus
FR2357685A1 (en) * 1976-07-05 1978-02-03 Valmet Oy Method to ensure the clamp guide the paper web in the initial part of the drying section of a paper machine
DE2813933A1 (en) * 1977-04-04 1978-10-12 Valmet Oy A method for guiding a web in the drying section of a paper machine drying cylinder group and for performing the method
US4361466A (en) * 1977-10-27 1982-11-30 Beloit Corporation Air impingement web drying method and apparatus
US4359827A (en) * 1979-11-05 1982-11-23 Weyerhaeuser Company High speed paper drying
US4359828A (en) * 1979-11-05 1982-11-23 Weyerhaeuser Company Vacuum box for use in high speed papermaking
US4441263A (en) * 1979-11-20 1984-04-10 Valmet Oy Device in the drying section of a paper machine
WO1982002938A1 (en) * 1981-02-17 1982-09-02 Co Weyerhaeuser A vacuum box for use in high speed papermaking
WO1982002937A1 (en) * 1981-02-17 1982-09-02 Co Weyerhaeuser High speed paper drying
JPS59150195A (en) * 1983-02-07 1984-08-28 Valmet Oy Method and constitution for guiding paper web to drying partfrom press zone of papermaking machine
JPH0635717B2 (en) 1983-02-07 1994-05-11 バルメット・オイ How to guide from the press department of the paper machine the paper web to the drying department and equipment
DE3344217A1 (en) * 1983-12-07 1985-06-20 Voith Gmbh J M An apparatus for transferring a paper web from the press section to the dryer section of a paper machine
DE3344217C2 (en) * 1983-12-07 1991-01-24 J.M. Voith Gmbh, 7920 Heidenheim, De
US4551203A (en) * 1984-04-02 1985-11-05 Valmet Oy Method and arrangement for guiding a paper web from the press section to the drying section
US4768294A (en) * 1985-12-17 1988-09-06 J. M. Voith, Gmbh Device for transferring a paper or board web from the press section to the dryer section of a paper machine
US4716660A (en) * 1986-04-03 1988-01-05 Hercules Incorporated Unifelt air suction system
US5507104A (en) * 1987-02-13 1996-04-16 Beloit Technologies, Inc. Web drying apparatus
US5832625A (en) * 1987-02-13 1998-11-10 Beloit Technologies, Inc. Apparatus for drying a web
US6049999A (en) * 1987-02-13 2000-04-18 Beloit Technologies, Inc. Machine and process for the restrained drying of a paper web
US5241760A (en) * 1987-02-13 1993-09-07 Beloit Technologies, Inc. Dryer apparatus
US5101577A (en) * 1987-02-13 1992-04-07 Beloit Corporation Web transfer apparatus
US5636448A (en) * 1987-02-13 1997-06-10 Beloit Technologies, Inc. Web drying apparatus
EP0321986A2 (en) * 1987-12-23 1989-06-28 Oy Tampella Ab Drying section in a paper making machine
EP0321986A3 (en) * 1987-12-23 1991-04-17 Oy Tampella Ab Drying section in a paper making machine
WO1990001085A1 (en) * 1988-07-22 1990-02-08 Beloit Corporation A dryer apparatus for drying a web
US4875976A (en) * 1988-09-27 1989-10-24 Beloit Corporation Transfer apparatus from press section to drying section
US4967489A (en) * 1988-12-14 1990-11-06 Valmet Paper Machinery Inc. Multi-cylinder dryer with twin-wire draw and web transfer between the cylinder groups
US5046266A (en) * 1988-12-14 1991-09-10 Valmet Paper Machinery Inc. Multi-cylinder dryer with twin-wire draw and web transfer between the cylinder groups
DE4012421A1 (en) * 1990-04-19 1991-10-24 Voith Gmbh J M Paper-making drying section in paper making machine - has compressed air directed at free side of the web in a free path to reduce shrinkage unevenness
US5884415A (en) * 1992-04-24 1999-03-23 Beloit Technologies, Inc. Paper making machine providing curl control
US5542193A (en) * 1992-04-24 1996-08-06 Beloit Technologies, Inc. Dryer group for curl control
US5336373A (en) * 1992-12-29 1994-08-09 Scott Paper Company Method for making a strong, bulky, absorbent paper sheet using restrained can drying
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EP0620313B2 (en) 1993-03-22 2009-11-04 Metso Paper, Inc. Drying method and drying module, as well as dryer sections that make use of same, in particular for a high-speed paper machine
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