EP0334899B2 - Apparatus for sequentially drying both sides of a paper web - Google Patents

Apparatus for sequentially drying both sides of a paper web Download PDF

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Publication number
EP0334899B2
EP0334899B2 EP88901398A EP88901398A EP0334899B2 EP 0334899 B2 EP0334899 B2 EP 0334899B2 EP 88901398 A EP88901398 A EP 88901398A EP 88901398 A EP88901398 A EP 88901398A EP 0334899 B2 EP0334899 B2 EP 0334899B2
Authority
EP
European Patent Office
Prior art keywords
dryer
web
felt
tier
drums
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88901398A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0334899A1 (en
EP0334899B1 (en
Inventor
O. Mihara Works Mitsubishi Heavy Ind.Coltd Sankoda
I. Mihara Works Ohnishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beloit Technologies Inc
Original Assignee
Beloit Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Beloit Technologies Inc filed Critical Beloit Technologies Inc
Priority to AT88901398T priority Critical patent/ATE70868T1/de
Publication of EP0334899A1 publication Critical patent/EP0334899A1/en
Application granted granted Critical
Publication of EP0334899B1 publication Critical patent/EP0334899B1/en
Publication of EP0334899B2 publication Critical patent/EP0334899B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders

Definitions

  • This invention relates to an apparatus for and a method of drying a web of paper.
  • DE-A-2 355 397 discloses an apparatus for sequentially drying both sides of a paper web, said apparatus comprising a plurality of groups of dryer drums, a plurality of guide rolls each being disposed between a respective pair of adjacent dryer drums, and a plurality of single dryer felts each being associated with a respective group of dryer drums and defining a continuous loop which extends in a sinusoidal configuration past alternate dryer drums of the respective group and guide rolls with the web being sandwiched between the dryer felt and each dryer drum for heating a respective side of the web and with the dryer felt being sandwiched between the web and each guide roll.
  • the known apparatus includes a web transfer section between two consecutive groups of dryer drums, said web transfer section comprising the downstream dryer felt associated with the downstream group of dryer drums and the upstream dryer felt associated with the upstream group of dryer drums and guide rolls for guiding said upstream dryer felt towards said downstream dryer felt with the web being supported and guided by the upstream dryer felt from the upstream group of dryer drums to the downstream group of dryer drums.
  • the embodiments shown in figures 5, 6, 8 and 9 of the above-mentioned document do not include means for holding the web against the respective dryer felt while the dryer felt passes around the guide rolls. Thus there is a danger for the web to become separated from the respective dryer felt.
  • the above-mentioned embodiments do not include means for completely avoiding an open draw in the web transfer sections. As a result the web in the web transfer sections is susceptible to breaks.
  • US-A-4 359 827 discloses an apparatus for drying a web, said apparatus comprising a series of upper dryer drums and a series of lower grooved dryer drums each being disposed between a pair of adjacent upper dryer drums, and a fabric which passes alternately around upper and lower dryer drums in a sinusoidal configuration with the web being sandwiched between the fabric and each upper drums and with the fabric being sandwiched between the web and each lower drum. Since there is no direct contact between the lower dryer drums and the web any drying of the web during passage around the lower dryer drums is greatly reduced. In order to hold the web against the fabric vacuum boxes are provided between the upper and lower dryer drums.
  • the lower drums are replaced with cylinders having foraminous major surfaces and that a vacuum is applied on the cylinder interiour so that the vacuum evacuates the grooves, thereby holding the web and fabric combination together onto the cylinder outer surface.
  • the foraminous cylinders should have a diameter smaller than the dryer drums.
  • the foraminous cylinders cannot be placed sufficiently close to the dryer drums to avoid a long fabric draw between consecutive dryer drums.
  • the vacuum boxes between the upper drums and the lower drums or lower foraminous cylinders fabric wear will occur whenever the fabric comes into contact with the vacuum boxes because they have a stationary rigid surface.
  • a BEL RUN type drying section in which a first drying section dries one side of the web and then a subsequent drying section dries the opposite side of the web.
  • the single felt section may be made up of four groups of rollers. Typically, these groups include drying rollers and suction rollers which provide no open draw in their configuration because the paper web is always supported by a dryer felt. As the web progresses from one group of dryers to the next, the same side of the web is always presented to the successive drying rollers. However, in order to present the opposite side of the web to a successive drying roller, it is necessary to transfer an unsupported web to a subsequent dryer felt.
  • a further conventional drying apparatus is the so-called single-felted dryer section in which a joint run of the web and felt successively passes around upper and lower dryer drums in a sinusoidal configuration.
  • this arrangement provides felt support for the web between successive upper and lower dryer drums, the lower dryer drums are virtually redundant in that the felt is sandwiched between the web and the drying roller thereby greatly reducing any drying of the web during passage around the lower drying rollers.
  • such a single-felted dryer section still does not dry from both sides.
  • a drying apparatus which includes a single-felted section consisting of three BEL RUN single-tier dryer groups and a fourth dryer group which is a single-felted two-tier dryer group.
  • Each BEL RUN group comprises a plurality of top-felted dryer drums and suction transfer rolls disposed below and between adjacent dryer drums.
  • the fourth dryer group has top and bottom dryer drums and a single felt which is sandwiched between the web and the bottom dryer drums.
  • a two-tier two-felt section for continuing the drying process by drying the web directly from alternate sides is disposed downstream relative to the fourth dryer group of the single-felted section of the drying apparatus referred to in the afore-mentioned article.
  • Such a drying apparatus is also illustrated schematically in Fig. 1 of the accompanying drawing and is considered to be the closest prior art.
  • An object of the present invention is to provide an apparatus and a method which overcome the afore-mentioned inadequacies of prior art drying apparatuses having BEL RUN and single-felted dryer groups, and which permit a simple and positive transfer of the web between successive dryer groups of the single-felted section of the drying apparatus in a no-open-draw-configuration such that both sides of the web can be dried directly, thereby providing a paper product having uniform surface characteristics, surface strength and smoothness, and no tendency to curl.
  • an apparatus for drying a web of paper comprising a substantially horizontally extending single-felted section which is made up of a plurality of successively arranged, substantially horizontally extending single-tier dryer groups each of which has a plurality of dryer drums and a plurality of suction transfer rolls which are smaller in diameter than the dryer drums and disposed between and below or above adjacent dryer drums; and means for supporting the web during its transfer between adjacent single-tier dryer groups; said plurality of single-tier dryer groups including a first single-tier dryer group having its dryer drums rotating in a first direction for drying the web from only one side thereof, and having its suction transfer rolls rotating in a second direction opposite to said first direction, and including a first dryer felt for conveying the web in a serpentine path along the dryer drums and suction transfer rolls of said first single-tier dryer group so that said one side of the web comes into physical contact with the dryer drums of said first single-tier dryer group; a second single-tier dryer group which is disposed substantially horizontal
  • a method of drying a web of paper including the steps of: guiding the web through a substantially horizontally extending single-felted section which is made up of a plurality of successively arranged, substantially horizontally extending single-tier dryer groups each of which has a plurality of dryer drums and a plurality of suction transfer rolls which are smaller in diameter than the dryer drums and disposed between and below or above adjacent dryer drums; and supporting the web during its transfer between adjacent single-tier dryer groups; said step of guiding the web through a substantially horizontally extending single-felted section including the sub-steps: of guiding said web through a first single-tier dryer group having its dryer drums rotating in a first direction for drying the web from only one side thereof, and having its suction transfer rolls rotating in a second direction opposite to said first direction, conveying said web contiguously with a first dryer felt such that the web and said first dryer felt follow a serpentine path along the dryer drums and suction transfer rolls of said first single-
  • Figure 1 is a side-elevational view of a conventional BEL RUN type drying section including groups A,B,C and D for drying a web of paper 1.
  • the web 1 is guided in sinusoidal configuration around a plurality of dryer drums 2, 2' and 2" and suction transfer rolls 3, 3' and 3".
  • a first felt 4 loops around a plurality of guide rolls 5, 5', 5", 5"' and 5"" and supports the web 1 as the web moves alternatively past dryer drums and suction rolls 3, 2, 3', 2', 3" and 2".
  • a second group B of dryer drums 6, 6', and 6" has suction rolls 7, 7' and 7" disposed alternately therebetween such that a second felt 4' loops around the suction rolls and dryer drums 7.
  • the present invention enables the web 1A to be reversed from a first single-tier dryer section or group A1 to a second single-tier dryer section or group B1 so that during passage of the web 1A through the first section A1 one or a first side 8A of the web 1A comes into physical contact with the dryer drums 2A, 2A' and 2A" rotating in a first direction 20.
  • the second section B1 another or a second side 9 of the web 1A comes into physical contact with the heating surface of dryer drums 6A, 6A' and 6A" rotating in a second direction 22 opposite to said first direction 20.
  • Figure 3 is an enlarged, fragmentary view of the transfer section shown in Figure 2 to show how the web 1A is reversed.
  • the apparatus generally designated 10 for reversing the paper web 1A includes the last dryer drum 2A" of the first section A1 with the web extending around a portion of the circumference of the dryer drum 2A".
  • a first felt 4A extends around a portion of the dryer drum 2A" such that the web 1A is sandwiched between the first felt 4A and the dryer drum 2A" for heating the first side 8A of the web 1A.
  • a first suction transfer roll 3A"' rotating in said second direction 22 is diposed downstream relative to the dryer drum 2A".
  • the first suction roll 3A"' has an axis of rotation which is disposed parallel and spaced relative to the rotational axis of the dryer drum 2A".
  • the first felt 4A and the web 1A extend around a portion of the circumference of the first suction roll 3A"' such that the first felt 4A is sandwiched between the web 1A and the first suction roll 3A"'.
  • First guiding means 5A as shown in Figure 2, guide the first felt 4A away from the first suction roll 3A"'.
  • a second or further suction transfer roll 7A rotating in said first direction 20 is disposed adjacent to the first suction roll 3A"', the second suction roll 7A having an axis of rotation parallel and spaced relative to the axis of rotation of the first suction roll 3A"'.
  • a second felt 4A' extends around the second suction roll 7A, and a second guiding means 12 shown in Figure 2 guides the second felt 4A' towards the second suction roll 7A. such that the first and second felts 4A and 4A' respectively define therebetween a web transfer section generally designated 14 so that the web 1A is sandwiched between the felts 4A and 4A' during passage through the transfer section 14.
  • the first dryer drum 6A of the second section B1 is disposed downstream relative to the second suction roll 7A with the dryer drum 6A having an axis of rotation parallel to the axis of rotation of the second suction roll 7A such that the web 1A is sandwiched between the second felt 4A' and the dryer drum 6A for heating the second side 9 of the web 1A.
  • the first felt 4A is a continuous loop which extends in sinusoidal configuration past alternate dryer drums and suction transfer rolls 3A, 2A, 3A', 2A' 3A", 2A" and 3A"' of the first section A1 such that the dryer drums 2A, 2A', 2A" physically contact the first side 8A of the web 1A and the second plurality of dryer drums 6A, 6A' and 6A" physically contact the second side 9 of the web 1A so that alternate sides of the web 1A are sequentially dried.
  • the first guiding means includes a first guide roll 5A for guiding the first felt 4A and the second guiding means includes a second guide roll 12 for guiding the second felt 4A'.
  • alternate sides 8A and 9 of the paper web 1A are sequentially dried by the following method steps:
  • the suction rolls are disposed below the dryer drums whereas in the second dryer section B1, the suction rolls are disposed above the dryer drums.
  • a third single-tier dryer section or group C1 is disposed, downstream relative to the second single-tier dryer section B1 for further drying the first side 8A of the web 1A, and a fourth single-tier dryer section or group D1 is disposed downstream relative to the third single tier dryer section C1 for further drying the second side 9 of the web 1A.
  • a further web transfer section is disposed between the second and third dryer sections B1 and C1, and yet another web transfer section is disposed between the third and fourth dryer sections C1 and D1.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
EP88901398A 1986-12-02 1987-11-12 Apparatus for sequentially drying both sides of a paper web Expired - Lifetime EP0334899B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88901398T ATE70868T1 (de) 1986-12-02 1987-11-12 Vorrichtung zur aufeinanderfolgenden trocknung beider seiten einer papierbahn.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP18501986 1986-12-02
JP185019/86 1986-12-02
JP1986185019U JPS6389996U (cs) 1986-12-02 1986-12-02
PCT/US1987/003087 WO1988004206A2 (en) 1986-12-02 1987-11-12 Apparatus for sequentially drying both sides of a paper web

Publications (3)

Publication Number Publication Date
EP0334899A1 EP0334899A1 (en) 1989-10-04
EP0334899B1 EP0334899B1 (en) 1991-12-27
EP0334899B2 true EP0334899B2 (en) 1999-08-25

Family

ID=16163349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88901398A Expired - Lifetime EP0334899B2 (en) 1986-12-02 1987-11-12 Apparatus for sequentially drying both sides of a paper web

Country Status (16)

Country Link
EP (1) EP0334899B2 (cs)
JP (1) JPS6389996U (cs)
KR (1) KR940005201B1 (cs)
CN (1) CN1013598B (cs)
AR (1) AR246571A1 (cs)
AT (1) ATE70868T1 (cs)
AU (1) AU612349B2 (cs)
BR (1) BR8707946A (cs)
CA (1) CA1340582C (cs)
DE (3) DE8717870U1 (cs)
FI (2) FI892657A (cs)
IN (1) IN168979B (cs)
PH (1) PH30381A (cs)
PL (1) PL158253B1 (cs)
WO (1) WO1988004206A2 (cs)
ZA (1) ZA879009B (cs)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1328167C (en) * 1987-02-13 1994-04-05 Borgeir Skaugen Apparatus for drying a web
US5279049A (en) * 1987-02-13 1994-01-18 Beloit Technologies, Inc. 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
US4918836A (en) * 1987-02-13 1990-04-24 Beloit Corporation Tail cutter apparatus and method
US4807371A (en) * 1987-02-13 1989-02-28 Beloit Corporation Apparatus for maintaining the edges of a web in conformity with a dryer felt
US5144758A (en) * 1987-02-13 1992-09-08 Borgeir Skaugen Apparatus for drying a web
US4934067A (en) * 1987-02-13 1990-06-19 Beloit Corporation Apparatus for drying a web
US5404653A (en) * 1987-02-13 1995-04-11 Beloit Technologies, Inc. Apparatus for drying a web
DE3721734A1 (de) * 1987-07-01 1989-01-12 Voith Gmbh J M Verfahren zum trocknen einer laufenden bahn sowie papier- oder kartonmaschine zur durchfuehrung des verfahrens
FI82097C (fi) * 1989-02-17 1991-01-10 Valmet Paper Machinery Inc Maongcylindertork i en pappersmaskin.
JPH0791798B2 (ja) * 1989-12-22 1995-10-04 敷島紡績株式会社 抄紙用ドライヤーフエルト
US5184408A (en) * 1990-01-19 1993-02-09 J. M. Voith Gmbh Dryer section
JP2558375B2 (ja) * 1990-05-30 1996-11-27 三菱製紙株式会社 抄紙乾燥機の断紙検知方法およびそれに使用されるドライヤーカンバス
DE4142524A1 (de) * 1991-12-21 1993-06-24 Voith Gmbh J M Trockenpartie
US5321899A (en) * 1992-04-13 1994-06-21 J. M. Voith Gmbh Dry end
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
DE19934777A1 (de) * 1999-07-23 2001-01-25 Voith Paper Patent Gmbh Trockenpartie
CN110172854A (zh) * 2019-06-28 2019-08-27 夏德亮 一种基于气流变换的造纸烘干装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2355397A1 (de) † 1972-11-13 1974-06-12 Valmet Oy Trockenzylindergruppe in einem mehrzylindertrockner fuer eine materialbahn, insbesondere fuer papier
US4359827A (en) † 1979-11-05 1982-11-23 Weyerhaeuser Company High speed paper drying

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2537129A (en) * 1945-10-05 1951-01-09 Beloit Iron Works Structure for web transfers
US4934067A (en) * 1987-02-13 1990-06-19 Beloit Corporation Apparatus for drying a web
DE3807856A1 (de) * 1988-03-10 1989-09-21 Voith Gmbh J M Verfahren zum trocknen einer materialbahn und vorrichtung zur durchfuehrung dieses verfahrens
DE3807858A1 (de) * 1988-03-10 1989-09-21 Voith Gmbh J M Verfahren zum trocknen einer materialbahn und vorrichtung zur durchfuehrung dieses verfahrens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2355397A1 (de) † 1972-11-13 1974-06-12 Valmet Oy Trockenzylindergruppe in einem mehrzylindertrockner fuer eine materialbahn, insbesondere fuer papier
US4359827A (en) † 1979-11-05 1982-11-23 Weyerhaeuser Company High speed paper drying
US4359827B1 (en) † 1979-11-05 1994-03-29 Keith V Thomas High speed paper drying

Also Published As

Publication number Publication date
WO1988004206A2 (en) 1988-06-16
AR246571A1 (es) 1994-08-31
CA1340582C (en) 1999-06-08
WO1988004206A3 (en) 1988-06-30
AU612349B2 (en) 1991-07-11
KR940005201B1 (ko) 1994-06-13
ATE70868T1 (de) 1992-01-15
IN168979B (cs) 1991-08-03
FI960348A (fi) 1996-01-25
FI892657A0 (fi) 1989-06-01
DE3775567D1 (de) 1992-02-06
PH30381A (en) 1997-04-15
KR890700180A (ko) 1989-03-10
AU1243988A (en) 1988-06-30
EP0334899A1 (en) 1989-10-04
BR8707946A (pt) 1990-02-13
CN87107232A (zh) 1988-07-06
FI892657A (fi) 1989-06-01
FI960348A0 (fi) 1996-01-25
PL269182A1 (en) 1988-08-18
DE334899T1 (de) 1990-07-26
ZA879009B (en) 1988-09-28
DE8717870U1 (de) 1991-03-28
JPS6389996U (cs) 1988-06-10
CN1013598B (zh) 1991-08-21
EP0334899B1 (en) 1991-12-27
PL158253B1 (pl) 1992-08-31

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