WO2006021500A1 - Maschine und verfahren zur herstellung einer faserstoffbahn mit gesteigertem volumen - Google Patents
Maschine und verfahren zur herstellung einer faserstoffbahn mit gesteigertem volumen Download PDFInfo
- Publication number
- WO2006021500A1 WO2006021500A1 PCT/EP2005/053875 EP2005053875W WO2006021500A1 WO 2006021500 A1 WO2006021500 A1 WO 2006021500A1 EP 2005053875 W EP2005053875 W EP 2005053875W WO 2006021500 A1 WO2006021500 A1 WO 2006021500A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fibrous web
- press
- belt
- band
- web
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/04—Arrangements thereof
- D21F3/045—Arrangements thereof including at least one extended press nip
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
Definitions
- the invention relates to a machine for producing a paper or another fibrous web.
- a press section for a paper machine has two pressing points, which are each formed by a press roller cooperating with a shoe press roll.
- a first upper felt, the paper web coming from a forming wire, an underfelt and a press jacket of a first shoe press roll pass through the first press point.
- the underfelt continues with the paper web to the second press site. Together with a second top felt and a press jacket of a second press site, the paper web then passes through the second press site.
- the paper web follows the underfelt further up to a take-off roll, through which it is transferred to a first dryer wire which transfers the paper web to the dryer section.
- Guide rollers and suction rollers are provided for deflecting the upper felt and the lower felt.
- the volume of the paper for a given smoothness for example, according to the Bendtsen measurement method is less than 200 ml / min, a quality feature, the maintenance of high-speed paper machines and high dry conditions problems prepares. For speeding up after passing through the press section required high dry contents lead to an undesirable reduction of the specific volume.
- this object is achieved in a machine of the type mentioned above in that an elastically stretchable in its length band is provided, wherein the fibrous web in the stretched state of the band is zugeperbar the band and then the band is relaxed with applied fibrous web, so that the fibrous web is compressed and wherein the adhesion forces between the fibrous web and the band are sufficiently high that wrinkling of the compressed fibrous web is avoided.
- an infinitesimal compression of the paper web is achieved on the carrier material over which it is guided.
- the paper web is first transported on a felt and then onto an elastic band, i. H. a screen, a felt or a transfer belt, transferred, which is stretched.
- the tensioned band is relieved, so that a compression of the paper web occurs.
- the band is advantageously designed such that the high adhesion forces that exist between the fibrous web and the belt prevents wrinkling in the paper web and ensures an infinitesimal compression.
- a particular advantage of the invention is thus the gain in volume without a disproportionate increase in basis weight.
- stretching and unloading of the strip is combined with a dewatering step therebetween.
- the drainage can be done at different points of the machine, for example. In the press section or the dryer section. In this procedure, a particularly high volume gain is achieved.
- the strip is advantageously extensible before or during passage through the first press nip and can be relaxed after passing through the last press nip, with the fibrous web being brought together with the band before or in the first press nip.
- the tape is stretched before or in the first press nip then the fibrous web is drained once or more times when passing through Pressnips and subsequently the band is relieved again.
- the machine has at least one press section with one or more press nips, it is conceivable to stretch the strip before passing through a press nip and to relieve it after passing through the same press nip and to bring the fibrous web together with the strip before or in the press nip.
- a deflection roller is present, which is drivable at lower Geschwiability than the first and the second pressure roller, which together form the press nip through which the fibrous web together with the tape is passed.
- the difference in speed between the press rolls on the one hand and the deflecting roll immediately preceding them is based on the fact that the press rolls are driven at a speed which is higher than that of the deflecting roll.
- the second belt is a conveyor belt for transferring the fibrous web to a third belt, through which the fibrous web can be guided by a subsequent dryer section to the press section.
- the invention also relates to a method for operating a machine for producing a paper or another fibrous web, comprising the following steps:
- the method for operating the machine is characterized in that the fibrous web is pressed on the transfer of the tape, for example, to improve the smoothness of a subsequent conveyor belt.
- the fibrous web is compressed by less than 5%, in particular by less than 3%.
- Fig. 1 a, b are schematic sectional views of the fibrous web before and after the
- FIG. 2 shows a fibrous web, which is guided by a press nip
- FIG. 3 shows a press section with a central roller forming two press nips
- Fig. 4 shows a press section with a two press nips forming central roller in conjunction with a part of a dryer section and
- Fig. 5 shows a press section with two press nips, each of individual
- Press roll pairs are formed, wherein the second press nip is formed by a press roll with a shoe press roll.
- a fibrous web 1 coming from a wire section, passed through a press section. In this it is passed through at least one press nip.
- the fibrous web 1 is applied to an elastic band 2, which is in an expanded state before passing through the press nip.
- the stretching of the strip 2 is canceled by, for example, a deflection roller arranged downstream of the press rolls in the web running direction is operated at a lower jacket speed.
- the fibrous web 1 is compressed.
- the thickness D Figure 1 b.
- Fig. 2 shows schematically one of a press roll 3 and a (not Press nip formed by the press fabric, through which the fibrous web 1 is passed together with two bands or felts 4, 5.
- a fibrous web 6 (FIG. 3) is transferred from a wire section 7 to a felt 54 and guided to the press section 8.
- it is first passed through a press nip 51 formed by rollers 10 and 50 and then through two press nips 12, 13 formed by a central roller 9 with two press rollers 10, 11.
- the press nip 51 the fibrous web 6 is guided together with the felt 54 and an elastic band.
- the elastic band 14 is supplied only in the press nip 51 of the fibrous web. The band 14 is not stretched before the press nip 51 but in the press nip 51 itself by pressure load.
- the band 14 i here in the thickness so flexible that at a pressure load within the press nip 51, the thickness reduction is associated with an elongation of the belt 14.
- the relaxation of the belt 14 after passage of the press nips 51 leads in addition to the expansion in the thickness direction to a reduction in length and an associated compression of the belt 14 and adhering thereon fibrous web 6.
- the fibrous web 6 passes through the Pressni ps 12, 13, which by the central roller 9 and the rollers 10 and 11 are formed.
- a fibrous web 17 coming from a wire section is transferred via a lower felt 18 into a press section 19 with a central roller 20.
- an application for example of starch
- an air-permeable belt 26 is applied to an air-permeable belt 26 via a device 25.
- This is heated together with the fibrous web 17 transported by it from both sides or at least from a single side, in particular from the top, by drying devices 27, 28 and dried.
- the upper drying device 28 generates hot air, while the lower drying device 27 is, for example, a radiation dryer.
- both drying devices 27, 28 are radiation dryers.
- the use of an air-permeable belt 26 has the advantage that it can be dried through it.
- a conditioning device 30 is employed. For example, a cleaning agent is applied by spraying, which is then wiped off again.
- the belt 26 dispenses the application of the medium in the press nip 21, which is applied by the device 25, to the fibrous web 17, while it wraps around the central roll 20 together with the fibrous web 17.
- the band 26 is also elastic, so that it first by a deflection roller 31 rotates at a lower speed than the central roller 20 and the press rollers 23, 24 is stretched and in the stretched state, the fibrous web 17 receives. After passing through the press nips 21, 22, the belt 26 is compressed again by a slower running guide roller 32 and with it also the fibrous web 17 lying on it, which at the same time receives a greater thickness and thus a larger volume.
- the fibrous web 17 After passing through the press section 19, the fibrous web 17 is directed into a single-row drying section 33 with drying cylinders 34 and guide rollers 35 and vacuum sections 36 designed as suction rollers.
- a negative pressure of preferably more than 5 kPa is used to allow a safe detachment of the fibrous web 17 of the drying cylinders 34, since just the acted upon with the medium side of the fibrous web 17 rests on the shell side of the drying cylinder 35.
- a fibrous web 37 is dewatered by a press section 38 in press nips 39, 40.
- the first press nip 39 is formed by the roller pair 52 and 53.
- the fibrous web 37 is passed between a press roll 41 and a shoe press roll 42.
- moisture is released to an elastic felt 43.
- the guide rollers 44, 45, 46, 47 are each formed as driven rollers.
- the guide roller 44 runs at a lower circumferential speed than the press roller 41 and the shoe press roller 42, so that the felt 43 is stretched when it receives the fibrous web 37 from a top felt 48 before the press nip 40.
Landscapes
- Paper (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/660,842 US20070267161A1 (en) | 2004-08-20 | 2005-08-05 | Machine and Method for the Production of a Web of Fiber Material with an Increased Volume |
JP2007526447A JP2008510892A (ja) | 2004-08-20 | 2005-08-05 | 増大体積を有する繊維材料ウェブを製造するための機械及び方法 |
EP05779840A EP1778913A1 (de) | 2004-08-20 | 2005-08-05 | Maschine und verfahren zur herstellung einer faserstoffbahn mit gesteigertem volumen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004040425A DE102004040425A1 (de) | 2004-08-20 | 2004-08-20 | Maschine zur Herstellung einer Faserstoffbahn und Verfahren zum Stauchen der Faserstoffbahn |
DE102004040425.9 | 2004-08-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006021500A1 true WO2006021500A1 (de) | 2006-03-02 |
Family
ID=35295337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/053875 WO2006021500A1 (de) | 2004-08-20 | 2005-08-05 | Maschine und verfahren zur herstellung einer faserstoffbahn mit gesteigertem volumen |
Country Status (6)
Country | Link |
---|---|
US (1) | US20070267161A1 (de) |
EP (1) | EP1778913A1 (de) |
JP (1) | JP2008510892A (de) |
CN (1) | CN101006226A (de) |
DE (1) | DE102004040425A1 (de) |
WO (1) | WO2006021500A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITVE20110063A1 (it) * | 2011-09-19 | 2013-03-20 | Giorgio Trani | Metodo di compensazione dimensionale di nastri di materiale fibroso. |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2624245A (en) * | 1952-06-11 | 1953-01-06 | Cluett Peabody & Co Inc | Modified paper and method for its manufacture |
US3140224A (en) * | 1960-05-02 | 1964-07-07 | Beloit Iron Works | Apparatus for compaction of formed sheet for improved properties |
US3454463A (en) * | 1966-07-12 | 1969-07-08 | Clupak Inc | Methods of making newsprint paper |
US3515633A (en) * | 1953-04-03 | 1970-06-02 | Clupak Inc | Compacting of paper and similar fiber webs |
-
2004
- 2004-08-20 DE DE102004040425A patent/DE102004040425A1/de not_active Withdrawn
-
2005
- 2005-08-05 US US11/660,842 patent/US20070267161A1/en not_active Abandoned
- 2005-08-05 CN CNA2005800281199A patent/CN101006226A/zh active Pending
- 2005-08-05 JP JP2007526447A patent/JP2008510892A/ja active Pending
- 2005-08-05 EP EP05779840A patent/EP1778913A1/de not_active Withdrawn
- 2005-08-05 WO PCT/EP2005/053875 patent/WO2006021500A1/de not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2624245A (en) * | 1952-06-11 | 1953-01-06 | Cluett Peabody & Co Inc | Modified paper and method for its manufacture |
US3515633A (en) * | 1953-04-03 | 1970-06-02 | Clupak Inc | Compacting of paper and similar fiber webs |
US3140224A (en) * | 1960-05-02 | 1964-07-07 | Beloit Iron Works | Apparatus for compaction of formed sheet for improved properties |
US3454463A (en) * | 1966-07-12 | 1969-07-08 | Clupak Inc | Methods of making newsprint paper |
Also Published As
Publication number | Publication date |
---|---|
CN101006226A (zh) | 2007-07-25 |
JP2008510892A (ja) | 2008-04-10 |
EP1778913A1 (de) | 2007-05-02 |
US20070267161A1 (en) | 2007-11-22 |
DE102004040425A1 (de) | 2006-02-23 |
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