EP0334899B2 - Apparatus for sequentially drying both sides of a paper web - Google Patents
Apparatus for sequentially drying both sides of a paper web Download PDFInfo
- 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
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- 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
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- 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.
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Abstract
Description
- 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. Moreover 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. Moreover, it is suggested that 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. There is no suggestion that the foraminous cylinders should have a diameter smaller than the dryer drums. Thus the foraminous cylinders cannot be placed sufficiently close to the dryer drums to avoid a long fabric draw between consecutive dryer drums. As a result of 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.
- Another conventional drying apparatus for sequentially drying both sides of a paper web is known in practice as 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. In the BEL RUN type drying section, 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. Although 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. Furthermore, such a single-felted dryer section still does not dry from both sides.
- In the aforementioned BEL RUN configurations and single-felted dryers, problems exist in that only one side of the web is dried during passage of the web through the first few groups of dryers. Consequently, such arrangement results in differences in surface strength and properties. Additionally, the smoothness of the respective surfaces of the web differ which is a problem when sheet paper is required in which both sides of the sheet must have similar characteristics. Also, curl and non-uniform response to change in humidity have been problems with the aforementioned dryer sections.
- In an article published in WOCHENBLATT FÜR PAPIERFABRIKATION No. 16 of 1986, J. Linderot: "10 Jahre Erfahrung mit Geschlossener Bahnführung in der Trockenpartie", pages 623-628, reference is made, on page 628, to 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.
- According to one aspect of the invention, there is provided 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 horizontally adjacent to and downstream of said first single-tier dryer group, said second single-tier dryer group having its dryer drums rotating in said second direction for drying the web only from the other side, and having its suction transfer rolls rotating in said first direction, and including a second dryer felt for conveying the web in a serpentine path along the dryer drums and suction transfer rolls of said second single-tier dryer group so that said other side of the web comes into physical contact with the dryer drums of said second single-tier dryer group; said means for supporting the web during its transfer between adjacent single-tier dryer groups including said first and second dryer felts; and felt guiding means for guiding said first and second dryer felts in close proximity to each other between said first and second single-tier dryer groups so as to sandwich the web between said first and second dryer felts; said felt guiding means including a first suction transfer roll disposed downstream relative to the dryer drums of said first single-tier dryer group and a further suction transfer roll disposed downstream relative to said first suction transfer roll for effecting a controlled transfer of the web from said first dryer felt to said second dryer felt so that the web is reversed for bringing said other side of the web into physical contact with the dryer drums of said second single-tier dryer group.
- According to another aspect of the invention there is provided a method of drying a web of paper, said method 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-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; guiding the web through a second single-tier dryer group which is disposed substantially horizontally adjacent to and downstream of said first single-tier dryer group, said second single-tier dryer group having its dryer drums rotating in said second direction for drying the web only from the other side, and having its suction transfer rolls rotating in said first direction, conveying the web contiguously with a second dryer felt such that the web and said second dryer felt follow a serpentine path along the dryer drums and suction transfer rolls of said second single-tier dryer group so that said other side of the web comes into physical contact with the dryer drums of said second single-tier dryer group; said step of supporting the web during its transfer between adjacent single-tier dryer groups including the sub-steps of: guiding said first and second dryer felts in close proximity to each other between said first and second single-tier dryer groups so as to sandwich the web between said first and second dryer felts; guiding a joint run of the web and said first dryer felt around a first suction transfer roll which is disposed downstream relative to the dryer drums of said first single-tier dryer group; and thereafter guiding a joint run of the web and said second dryer felt around a further suction transfer roll for effecting a controlled transfer of the web from said first dryer felt to said second dryer felt so that the web is reversed for bringing said other side of the web into physical contact with the dryer drums of said second single-tier dryer group.
- Although the present invention is desribed with a certain degree of particularity in the detailed description contained hereinafter, it will be apparent to those skilled in the art that many modifications and variations of the concept of the present invention can be carried out without departing the spirit and scope of the present invention. In the drawing,
- Figure 1 is a side-elevational view of a prior art BEL RUN type drying section showing the first four groups of dryer drums drying a first side of a paper web,
- Figure 2 is a side-elevational view of a drying apparatus according to the present invention showing the means for transferring the web without open draw from a first to a second felt means, and
- Figure 3 is an enlarged side-elevational view of Figure 2 particularly showing, in detail, the web transfer section enabling the opposite side of the web to come into physical contact with a subsequent group of dryer drums.
-
- Similar reference characters refer to similar parts throughout the various Figures of the drawing.
- 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. As shown in Figure 1, the web 1 is guided in sinusoidal configuration around a plurality of
dryer drums guide rolls suction rolls 3, 2, 3', 2', 3" and 2". A second group B ofdryer drums dryer drum 2" rotates adjacent to the second felt 4' so that the web 1 is transferred to the second felt 4' and around the suction roll 7. However, as seen in Figure 1, the same side 8 of the web 1 is brought into contact with the heating surfaces of thedryer rolls - The present invention, as shown in Figure 2, 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 first direction 20. In 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 asecond direction 22 opposite to saidfirst 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. More particularly, with reference to Figure 3, 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 thedryer drum 2A". A first felt 4A extends around a portion of thedryer drum 2A" such that the web 1A is sandwiched between the first felt 4A and thedryer drum 2A" for heating the first side 8A of the web 1A. A firstsuction transfer roll 3A"' rotating in saidsecond direction 22 is diposed downstream relative to thedryer drum 2A". Thefirst suction roll 3A"' has an axis of rotation which is disposed parallel and spaced relative to the rotational axis of thedryer drum 2A". The first felt 4A and the web 1A extend around a portion of the circumference of thefirst suction roll 3A"' such that the first felt 4A is sandwiched between the web 1A and thefirst suction roll 3A"'. First guiding means 5A, as shown in Figure 2, guide the first felt 4A away from thefirst suction roll 3A"'. A second or furthersuction transfer roll 7A rotating in saidfirst direction 20 is disposed adjacent to thefirst suction roll 3A"', thesecond suction roll 7A having an axis of rotation parallel and spaced relative to the axis of rotation of thefirst suction roll 3A"'. A second felt 4A' extends around thesecond suction roll 7A, and a second guiding means 12 shown in Figure 2 guides the second felt 4A' towards thesecond suction roll 7A. such that the first andsecond felts felts transfer section 14. The first dryer drum 6A of the second section B1 is disposed downstream relative to thesecond suction roll 7A with the dryer drum 6A having an axis of rotation parallel to the axis of rotation of thesecond 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. - As shown in Figure 2, the
first felt 4A is a continuous loop which extends in sinusoidal configuration past alternate dryer drums andsuction transfer rolls dryer drums - More specifically, 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'. - In operation of the apparatus according to the present invention, alternate sides 8A and 9 of the paper web 1A are sequentially dried by the following method steps:
- 1. The joint run of the web 1A and the first felt 4A
are guided around the
dryer drums suction rolls 3A', 3A as shown in Figure 2 such that the web 1A is sandwiched between the first felt 4A and thedryer drums - 2. Thereafter, the joint run of the web 1A and the
first felt 4A are guided around afirst suction roll 3A"' such that thefirst felt 4A is sandwiched between the web 1A and thefirst suction roll 3A"'. - 3. The
first felt 4A is guided around a first guide roll 5A, and asecond felt 4A' is guided from asecond guide roll 12 around asecond suction roll 7A such that the first andsecond felts web transfer section 14 so that the web 1A supported by thefirst felt 4A is guided into theweb transfer section 14 with the web 1A being disposed between the first andsecond felts - 4. The web 1A emerging from the
web transfer section 14 is drawn around thesecond suction roll 7A such that thesecond felt 4A' is disposed between the web 1A and thesecond suction roll 7A. - 5. Thereafter, the joint run of the web 1A and second
felt 4A' is directed around the dryer drums 6A,
6A', 6A" and suction transfer rolls 7A', 7A" such that the
web 1A is sandwiched between the
second felt 4A' and the dryer drums 6A, 6A', 6A" for heating the second side 9 of the web 1A. -
- In the first dryer section A1, 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. This configuration enables the provision of the aforementioned simple web transfer section such that the web may be transferred from the first to the second felt.
- 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.
Claims (9)
- An apparatus for drying a web of paper (1A) comprisinga substantially horizontally extending single-felted section which is made up of
a plurality of successively arranged, substantially horizontally extending single-tier dryer groups (A1, B1, C1, D1) each of which has a plurality of dryer drums (2A, 2A', 2A"; 6A, 6A', 6A") and a plurality of suction transfer rolls (3A', 3A"; 7A', 7A") which are smaller in diameter than the dryer drums and disposed between and below or above adjacent dryer drums; andmeans (4A, 4A', 3A"', 7A, 5A, 12; 7A"') for supporting the web (1A) during its transfer between adjacent single-tier dryer groups (A1, B1; B1, C1; C1, D1);said plurality of single-tier dryer groups includinga first single-tier dryer group (A1) having its dryer drums (2A, 2A', 2A") rotating in a first direction (20) for drying the web (1A) from only one side (8A) thereof, and having its suction transfer rolls (3A', 3A") rotating in a second direction (22) opposite to said first direction (20), and including a first dryer felt (4A) for conveying the web (1A) in a serpentine path along the dryer drums (2A, 2A', 2A") and suction transfer rolls (3A', 3A") of said first single-tier dryer group (A1) so that said one side (8A) of the web (1A) comes into physical contact with the dryer drums (2A, 2A', 2A") of said first single-tier dryer group (A1) ;a second single-tier dryer group (B1) which is disposed substantially horizontally adjacent to and downstream of said first single-tier dryer group (A1), said second single-tier dryer group (B1) having its dryer drums (6A, 6A', 6A") rotating in said second direction (22) for drying the web (1A) only from the other side (9), and having its suction transfer rolls (7A', 7A") rotating in said first direction (20), and including a second dryer felt (4A') for conveying the web in a serpentine path along the dryer drums (6A, 6A', 6A") and suction transfer rolls (7A', 7A") of said second single-tier dryer group (B1) so that said other side (9) of the web (1A) comes into physical contact with the dryer drums (6A, 6A', 6A") of said second single-tier dryer group (B1);said means for supporting the web (1A) during its transfer between adjacent single-tier dryer groups includingsaid first and second dryer felts (4A, 4A'); andfelt guiding means (3A"', 5A, 7A, 12) for guiding said first and second dryer felts (4A, 4A') in close proximity to each other between said first and second single-tier dryer groups (A1, B1) so as to sandwich the web (1A) between said first and second dryer felts (4A, 4A');said felt guiding means including a further suction transfer roll (7A) for effecting a controlled transfer of the web (1A) from said first dryer felt (4A) to said second dryer felt (4A') so that the web (1A) is reversed for bringing said other side (9) of the web (1A) into physical contact with the dryer drums (6A, 6A', 6A") of said second single-tier dryer group (B1). - An apparatus as set forth in claim 1 wherein said felt guiding means include a first suction transfer roll (3A"') disposed downstream relative to the dryer drums (2A, 2A',2A") of said first single-tier dryer group (A1), and said further suction transfer roll (7A) which is disposed downstream relative to said first suction transfer roll (3A"'), said first suction transfer roll (3A"') being operable to apply a vacuum to said web (1A) through said first dryer felt (4A) to hold said web (1A) against said first dryer felt (4A) while said web (1A) and said first dryer felt (4A) pass jointly around said first suction transfer roll (3A"), said further suction transfer roll (7A) being operable to apply a vacuum to said web (1A) through said second dryer felt (4A') to hold said web (1A) against said second dryer felt (4A') when said first dryer felt (4A) separates from the web (1A).
- An apparatus as set forth in claim 2, said apparatus including a third single-tier dryer group (C1) disposed downstream relative to said second single-tier dryer group (B1) and having its dryer drums rotating in said first direction (20) for further drying said one side (8A) of the web (1A), said third single-tier dryer group (C1) having its suction transfer rolls rotating in said second direction (22) and including a third dryer felt for conveying the web (1A) in a serpentine path along the dryer drums and suction transfer rolls of said third single-tier dryer group (C1), a fourth single-tier dryer group (D1) disposed downstream relative to said third single-tier dryer group (C1) and having its dryer drums rotating in said second direction (22) for further drying said other side (9) of the web (1A), said fourth single-tier dryer group (D1) having its suction transfer rolls rotating in said first direction (20) and including a fourth dryer felt for conveying the web (1A) in a serpentine path along the dryer drums and suction transfer rolls of said fourth single-tier dryer group (D1), further felt guiding means (7A"') for guiding said second and third dryer felts (4A') in close proximity to each other between said second and third single-tier dryer groups (B1, C1) so as to sandwich the web (1A) between said second and third dryer felts (4A') to effect a further controlled transfer of the web (1A) from said second dryer felt (4A') to said third dryer felt, and additional felt guiding means for guiding said third and fourth dryer felts in close proximity to each other between said third and fourth single-tier dryer groups (C1, D1) so as to sandwich the web (1A) between said third and fourth dryer felts to effect yet another controlled transfer of the web (1A) from said third dryer felt to said fourth dryer felt, wherein each of said further felt guiding means and said additional felt guiding means include a respective pair of suction transfer rolls disposed adjacent to each other.
- An apparatus as set forth in claim 2 or claim 3 wherein said felt guiding means for guiding said first and second dryer felts (4A, 4A') in close proximity to each other include a first guide roll (5A) for guiding said first dryer felt (4A) away from said first suction transfer roll (3A"), and a second guide roll (12) for guiding said second dryer felt (4A) towards said further suction transfer roll (7A).
- An apparatus as set forth in claim 3 wherein each dryer felt (4A, 4A') defines a continuous loop which extends in sinusoidal configuration past alternate dryer drums and suction transfer rolls of the respective one of said single-tier dryer groups (A1, B1, C1, D1) such that each dryer drum of said first and third single-tier dryer groups (A1, C1) physically contacts said one side (8A) of the web (1A), and each dryer drum of said second and fourth single-tier dryer groups (B1, C1) physically contacts said other side (9) of the web (1A) so that alternate sides (8A, 9) of the web (1A) are sequentially dried.
- An apparatus as set forth in claim 5 wherein said pluralities of suction transfer rolls (3A', 3A"; 7A', 7A") are disposed alternately below and above said pluralities of dryer drums (2A, 2A', 2A"; 6A, 6A', 6A").
- A method of drying a web of paper (1A), said method including the steps of:guiding the web (1A) 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 (A1, B1, C1, D1) each of which has a plurality of dryer drums (2A, 2A', 2A"; 6A, 6A', 6A"') and a plurality of suction transfer rolls (3A', 3A"; 7A', 7A") which are smaller in diameter than the dryer drums and disposed between and below or above adjacent dryer drums; andsupporting the web (1A) during its transfer between adjacent single-tier dryer groups (A1, B1; B1, C1; C1, D1); said step of guiding the web (1A) through a substantially horizontally extending single-felted section including the sub-steps of:guiding said web (1A) through a first single-tier dryer group (A1) having its dryer drums (2A, 2A', 2A") rotating in a first direction (20) for drying the web (1A) from only one side (8A) thereof, and having its suction transfer rolls (3A', 3A") rotating in a second direction (22) opposite to said first direction (20), conveying said web (1A) contiguously with a first dryer felt (4A) such that the web (1A) and said first dryer felt (4A) follow a serpentine path along the dryer drums (2A, 2A', 2A") and suction transfer rolls (3A', 3A") of said first single-tier dryer group (A1) so that said one side (8A) of the web (1A) comes into physical contact with the dryer drums (2A, 2A', 2A") of said first single-tier dryer group (A1) ;guiding the web (1A) through a second single-tier dryer group (B1) which is disposed substantially horizontally adjacent to and downstream of said first single-tier dryer group (A1), said second single-tier dryer group (B1) having its dryer drums (6A, 6A', 6A") rotating in said second direction (22) for drying the web (1A) only from the other side (9), and having its suction transfer rolls (7A', 7A") rotating in said first direction (20),conveying the web (1A) contiguously with a second dryer felt (4A') such that the web (1A) and said second dryer felt (4A') follow a serpentine path along the dryer drums (6A, 6A', 6A") and suction transfer rolls (7A', 7A") of said second single-tier dryer group (B1) so that said other side (9) of the web (1A) comes into physical contact with the dryer drums (6A, 6A', 6A") of said second single-tier dryer group (B1);said step of supporting the web (1A) during its transfer between adjacent single-tier dryer groups (A1, B1; B1, C1; C1, D1) including the sub-steps of:guiding said first and second dryer felts (4A, 4A') in close proximity to each other between said first and second single-tier dryer groups (A1, B1) so as to sandwich the web (1A) between said first and second dryer felts (4A, 4A'); andguiding said second dryer felt (4A') around a further suction transfer roll (7A) for effecting a controlled transfer of the web (1A) from said first dryer felt (4A) to said second dryer felt (4A') so that the web (1A) is reversed for bringing said other side (9) of the web (1A) into physical contact with the dryer drums (6A, 6A', 6A") of said second single-tier dryer group (B1).
- A method of drying a web (1A) as set forth in claim 7, said method including the steps of:guiding a joint run of the web (1A) and said first dryer felt (4A) around a first suction transfer roll (3A"') ;guiding said first dryer felt (4A) around a first guide roll (5A);guiding said second dryer felt (4A') from a second guide roll (12) around said further suction transfer roll (7A); and thereafterdirecting a joint run of the web (1A) and said second dryer felt (4A') around each dryer drum of said second single-tier dryer group (B1).
- A method of drying a web (1A) as set forth in claim 7 or claim 8, said method including the steps of:guiding the web (1A) through a third single-tier dryer group (C1) for further drying said one side (8A) of the web (1A); and thereafterguiding the web (1A) through a fourth single-tier dryer group (D1) for further drying said other side (9) of the web (1A).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88901398T ATE70868T1 (en) | 1986-12-02 | 1987-11-12 | DEVICE FOR SUCCESSIVELY DRYING BOTH SIDES OF A PAPER WEB. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP185019/86 | 1986-12-02 | ||
JP1986185019U JPS6389996U (en) | 1986-12-02 | 1986-12-02 | |
JP18501986 | 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 (en) |
JP (1) | JPS6389996U (en) |
KR (1) | KR940005201B1 (en) |
CN (1) | CN1013598B (en) |
AR (1) | AR246571A1 (en) |
AT (1) | ATE70868T1 (en) |
AU (1) | AU612349B2 (en) |
BR (1) | BR8707946A (en) |
CA (1) | CA1340582C (en) |
DE (3) | DE334899T1 (en) |
FI (2) | FI892657A0 (en) |
IN (1) | IN168979B (en) |
PH (1) | PH30381A (en) |
PL (1) | PL158253B1 (en) |
WO (1) | WO1988004206A2 (en) |
ZA (1) | ZA879009B (en) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5101577A (en) * | 1987-02-13 | 1992-04-07 | Beloit Corporation | Web transfer apparatus |
US5404653A (en) * | 1987-02-13 | 1995-04-11 | Beloit Technologies, Inc. | Apparatus for drying a web |
US5241760A (en) * | 1987-02-13 | 1993-09-07 | Beloit Technologies, Inc. | Dryer apparatus |
US4918836A (en) * | 1987-02-13 | 1990-04-24 | Beloit Corporation | Tail cutter apparatus and method |
US5144758A (en) * | 1987-02-13 | 1992-09-08 | 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 |
US4807371A (en) * | 1987-02-13 | 1989-02-28 | Beloit Corporation | Apparatus for maintaining the edges of a web in conformity with a dryer felt |
CA1328167C (en) * | 1987-02-13 | 1994-04-05 | Borgeir Skaugen | Apparatus for drying a web |
US4934067A (en) * | 1987-02-13 | 1990-06-19 | Beloit Corporation | Apparatus for drying a web |
DE3721734A1 (en) * | 1987-07-01 | 1989-01-12 | Voith Gmbh J M | METHOD FOR DRYING A RUNNING TRAIN AND PAPER OR CARDBOARD MACHINE FOR CARRYING OUT THE METHOD |
FI82097C (en) * | 1989-02-17 | 1991-01-10 | Valmet Paper Machinery Inc | Multi-cylinder dryer in a paper machine |
JPH0791798B2 (en) * | 1989-12-22 | 1995-10-04 | 敷島紡績株式会社 | Papermaking dryer felt |
US5184408A (en) * | 1990-01-19 | 1993-02-09 | J. M. Voith Gmbh | Dryer section |
JP2558375B2 (en) * | 1990-05-30 | 1996-11-27 | 三菱製紙株式会社 | Method of detecting paper break in paper making dryer and dryer canvas used therefor |
DE4142524A1 (en) * | 1991-12-21 | 1993-06-24 | Voith Gmbh J M | DRY LOT |
US5321899A (en) * | 1992-04-13 | 1994-06-21 | J. M. Voith Gmbh | Dry end |
US5542193A (en) * | 1992-04-24 | 1996-08-06 | Beloit Technologies, Inc. | Dryer group for curl control |
US5884415A (en) * | 1992-04-24 | 1999-03-23 | Beloit Technologies, Inc. | Paper making machine providing curl control |
DE19934777A1 (en) * | 1999-07-23 | 2001-01-25 | Voith Paper Patent Gmbh | Dryer section producing or finishing paper, card or tissue web includes detachment region without support, which is provided further away by drying sieve |
CN110172854A (en) * | 2019-06-28 | 2019-08-27 | 夏德亮 | A kind of papermaking dryer based on air-flow transformation |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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DE2355397A1 (en) † | 1972-11-13 | 1974-06-12 | Valmet Oy | DRYING CYLINDER GROUP IN A MULTI-CYLINDER DRYER FOR A MATERIAL TRAIN, IN PARTICULAR FOR PAPER |
US4359827A (en) † | 1979-11-05 | 1982-11-23 | Weyerhaeuser Company | High speed paper drying |
Family Cites Families (4)
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 |
DE3807858A1 (en) * | 1988-03-10 | 1989-09-21 | Voith Gmbh J M | Process for drying a material web and apparatus for carrying out this process |
DE3807856A1 (en) * | 1988-03-10 | 1989-09-21 | Voith Gmbh J M | METHOD FOR DRYING A MATERIAL RAIL AND DEVICE FOR CARRYING OUT THIS METHOD |
-
1986
- 1986-12-02 JP JP1986185019U patent/JPS6389996U/ja active Pending
-
1987
- 1987-11-12 KR KR1019880700915A patent/KR940005201B1/en not_active IP Right Cessation
- 1987-11-12 DE DE198888901398T patent/DE334899T1/en active Pending
- 1987-11-12 EP EP88901398A patent/EP0334899B2/en not_active Expired - Lifetime
- 1987-11-12 DE DE8717870U patent/DE8717870U1/en not_active Expired - Lifetime
- 1987-11-12 WO PCT/US1987/003087 patent/WO1988004206A2/en active Application Filing
- 1987-11-12 BR BR8707946A patent/BR8707946A/en not_active IP Right Cessation
- 1987-11-12 AT AT88901398T patent/ATE70868T1/en not_active IP Right Cessation
- 1987-11-12 DE DE8888901398T patent/DE3775567D1/en not_active Expired - Lifetime
- 1987-11-12 AU AU12439/88A patent/AU612349B2/en not_active Expired
- 1987-11-30 CA CA000553056A patent/CA1340582C/en not_active Expired - Fee Related
- 1987-12-01 ZA ZA879009A patent/ZA879009B/en unknown
- 1987-12-01 PH PH36148A patent/PH30381A/en unknown
- 1987-12-01 IN IN940/CAL/87A patent/IN168979B/en unknown
- 1987-12-02 PL PL1987269182A patent/PL158253B1/en unknown
- 1987-12-02 CN CN87107232A patent/CN1013598B/en not_active Expired
- 1987-12-21 AR AR87309466A patent/AR246571A1/en active
-
1989
- 1989-06-01 FI FI892657A patent/FI892657A0/en not_active Application Discontinuation
-
1996
- 1996-01-25 FI FI960348A patent/FI960348A/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2355397A1 (en) † | 1972-11-13 | 1974-06-12 | Valmet Oy | DRYING CYLINDER GROUP IN A MULTI-CYLINDER DRYER FOR A MATERIAL TRAIN, IN PARTICULAR FOR PAPER |
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 |
---|---|
WO1988004206A3 (en) | 1988-06-30 |
FI960348A0 (en) | 1996-01-25 |
ZA879009B (en) | 1988-09-28 |
WO1988004206A2 (en) | 1988-06-16 |
JPS6389996U (en) | 1988-06-10 |
EP0334899B1 (en) | 1991-12-27 |
FI960348A (en) | 1996-01-25 |
KR890700180A (en) | 1989-03-10 |
KR940005201B1 (en) | 1994-06-13 |
ATE70868T1 (en) | 1992-01-15 |
IN168979B (en) | 1991-08-03 |
DE334899T1 (en) | 1990-07-26 |
DE8717870U1 (en) | 1991-03-28 |
BR8707946A (en) | 1990-02-13 |
PL158253B1 (en) | 1992-08-31 |
PH30381A (en) | 1997-04-15 |
PL269182A1 (en) | 1988-08-18 |
AR246571A1 (en) | 1994-08-31 |
AU612349B2 (en) | 1991-07-11 |
AU1243988A (en) | 1988-06-30 |
CN87107232A (en) | 1988-07-06 |
FI892657A (en) | 1989-06-01 |
CN1013598B (en) | 1991-08-21 |
EP0334899A1 (en) | 1989-10-04 |
CA1340582C (en) | 1999-06-08 |
FI892657A0 (en) | 1989-06-01 |
DE3775567D1 (en) | 1992-02-06 |
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