EP1819872A1 - Drier section - Google Patents
Drier sectionInfo
- Publication number
- EP1819872A1 EP1819872A1 EP05773999A EP05773999A EP1819872A1 EP 1819872 A1 EP1819872 A1 EP 1819872A1 EP 05773999 A EP05773999 A EP 05773999A EP 05773999 A EP05773999 A EP 05773999A EP 1819872 A1 EP1819872 A1 EP 1819872A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drying section
- section according
- press
- fibrous web
- impingement
- 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.)
- Granted
Links
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
- D21F5/18—Drying webs by hot air
- D21F5/182—Drying webs by hot air through perforated cylinders
Definitions
- the invention relates to a dryer section of a machine for producing a fibrous web, in particular paper, board or tissue web, and a machine for producing a fibrous web with such a drying section.
- the paper web is guided for drying over a plurality of steam-heated cylinders or via an arrangement of the plurality of steam-heated cylinders and suction suction rolls.
- problems often occur with respect to the web guide, which are in particular due to the fact that the still wet web sticks to the smooth contact surfaces which are sufficient for heat transfer are absolutely necessary.
- relatively high trains are required, which now frequently lead to railway declines and overstretching of the web edges.
- a lower vapor pressure prevails, which means that the required dryer section becomes longer overall.
- the above-mentioned problems increasingly occur at higher web speeds.
- the invention has for its object to provide an improved dryer section and an improved machine of the type mentioned, in which at the same time both at high machine speed the best possible drying rate at the beginning of drying and a secure web guide is guaranteed.
- a problem-free removal of rejects should be possible in particular.
- the railway transfer from the press should be improved.
- a sufficient distance from the first support roller with associated impingement flow dryer should be ensured in order to gain space for any hood movement and the sieve guide.
- this object is achieved by a dryer section of a machine for producing a fibrous web, in particular paper, board or tissue web, in which the fibrous web, starting from the last press nip of a press section via a straight or slightly curved transfer line to a particular larger support roller with associated impingement through which the guided around the support roller fibrous web with a hot air and / or hot steam impact flow is acted upon, wherein the transfer path is formed by a guided around two suction rolls sieve, the one for holding the Faserstoffahn on the screen one or more Foil- / / or vacuum boxes are assigned, and wherein the first suction roll, the fibrous web decreases from a expiring from the press nip press belt or - felt or from a transfer belt and the second suction roll holds the fibrous web only at the deflection around this roller.
- the fibrous web is preferably guided around at least two, in particular larger Stützwal ⁇ zen each associated impingement dryer, wherein the fibrous web advantageously without Abdgingsaugwalze directly from the first support roller looping sieve on the second support roller um ⁇ looping sieve or the sieve entwined second support roller is passed.
- the fibrous web can therefore be transferred, for example, shortly before the second support roller onto the sieve thereof or directly onto the sieve wrap around the second support roller.
- the moisture transverse profile of the fibrous web can be detected via a corresponding measuring device on the free side of the fibrous web.
- separating devices for separating an edge strip or a transfer strip of the fibrous web in the area of the transfer line.
- a good reject distance can be achieved by, for example, only one hood located below.
- an optimal transfer of the fibrous web from the press section to the first impingement or impingement dryer with sufficient space for the wire guide is ensured.
- the fibrous web prefferably has no contact with a smooth press roll in the press section and to come into contact with a smooth drying cylinder only in the dryer section after reaching a relatively high moisture content and thus sufficient strength, ie after the impingement flow dryers , This excludes the possibility of stretching the fibrous web when it comes off a smooth lateral surface.
- the region in which the second suction roll of the transfer web is looped except for the transfer felt and the fibrous web is also surrounded by the wire guided around the first, in particular larger, support roll with associated impingement dryer.
- the wrap-around region in question is preferably variably adjustable via an adjustable roller arranged within the loop of the support roller screen.
- a respective support roller with associated impingement dryer is expediently acted upon by vacuum.
- a respective impingement flow dryer may comprise at least one hot air and / or superheated steam hood.
- each larger support roller is associated with only one hood.
- the or the particular larger back-up rolls, each with an associated impingement flow dryer are arranged in the web running direction directly after the press section and before a cylinder drying section.
- an impingement dryer is at least provided, the blowing speed to about 550 0 C and / or with a Aus ⁇ to about 130 m / s operable at a temperature of about 300 from about the 70th
- the hood of a respective impingement flow dryer can be provided, for example, with a perforated plate and / or slots as nozzles for the hot air or steam.
- the diameter of the perforated nozzles advantageously lies in a range from about 4 to about 12 mm, and preferably in one Range from about 6 to about 9 mm.
- the proportion of the nozzles in the total area is advantageously about 2 to about 4%.
- the hood of a respective impingement flow dryer preferably has a plurality of return air openings, via which the hot air can be sucked out together with the steam of the drying.
- These remind Kunststofföffnun ⁇ gene are preferably covered with a perforated plate or grid, which is insbe ⁇ special prevents that shreds enter these openings.
- a respective hood wraps around the respective support roller in accordance with an angle of at least 80 ° and at most 180 °, wherein this wrap angle is preferably in a range of about 90 to about 130 °.
- the hood of a respective impingement flow dryer preferably consists of a plurality of modules, each with a separate hot air or hot steam cycle over the width of the fibrous web, wherein the width of each module is preferably in a range of about 2 to about 4 m.
- two impingement flow dryers are provided which are designed for a dry content increase of about 2 to about 10%, the corresponding dry content increase for papers having a surface weight of more than 60 g / m 2 in a range of from about 2 to about 5% and in the range of about 4 to about 10% for papers having a basis weight of less than 60 g / m 2 .
- the hood of a respective impingement flow dryer is movably mounted and can be lifted, for example, for transfer, for cleaning and maintenance or for changing the screen of the respective support roller.
- a respective back-up roll may have a special pattern of dripping with stripes having a larger open area than the remaining areas.
- the strips can be provided in particular in the region of the lateral web edges.
- a plurality of strips across the width may also be provided in the central region of the web.
- a respective support roller is preferably not sucked over the relevant bearing, but by an outer box over the lateral surface.
- a respective backup roll has a diameter of at least about 3 m.
- a respective Transfer ⁇ suction box between the two suction rolls after the press section in particular special vacuum generation by suction or via a Foil bin include.
- the vacuum of a respective Foil- and / or Vakuum ⁇ box control and / or regulated, so that for transferring a sufficient vacuum generated or a high amount of air can be sucked, in operation in coverage by the fibrous web but no to high vacuum occurs with a strong Siebauslenkung, ie it is sucked in operation only a smaller amount of air.
- a respective foil and / or vacuum box is expediently adjustable in its position in order, for example, to compensate for a sieve deflection after the fibrous web has been completely transferred.
- a respective foil and / or vacuum box is advantageously designed so that a short-term contact between the sieve and the box after the transfer and before the time at which the vacuum is reduced to the operating value, to no damage to the wire or box and also can not lead to the collapse of the vacuum.
- a respective foil and / or vacuum box on the side facing the screen is preferably provided with rounded contact surfaces, Teflon strips and / or surfaces serving as spacers.
- a respective foil and / or vacuum box is expediently provided with a lateral seal against the transfer screen.
- this lateral seal may comprise, for example, an air knife and / or a side plate preferably made of Teflon.
- a respective foil and / or vacuum box can be sealed, for example, by a Teflon plate and / or a scraper blade against the adjacent suction roll.
- a respective foil and / or vacuum box is operated in operation with a vacuum in the range of about 50 to 1000 Pa, and preferably in the range of about 100 to about 600 Pa.
- the transfer distance between the two suction rolls is expediently shorter than about 4 m and preferably shorter than about 3 m.
- the transfer section can be horizontal or slightly inclined to the horizontal.
- the machine according to the invention comprising a press section and a dryer section for producing a fibrous web, in particular a paper, board or tissue web, is characterized in that it is provided with a dryer section according to the invention.
- the press section preferably comprises at least one shoe press.
- the press section is preferably designed so that the fibrous web does not come into contact with any smooth roller in this press section.
- the press section consists only of one or more shoe presses.
- the press section may comprise a tilted tandem or single shoe press.
- the press section comprises a press arrangement with a roll press nip and a press nip.
- the press section comprises a press arrangement with at least one suction press roll.
- At least one transfer belt may be provided in the press section.
- the dry content after the press section in wood-free or specialty papers at least 40%, preferably at least 43%, and at holz ⁇ containing papers (such as newspaper printing, SC, LWC, .7) at least 46%, preferably at least 49%.
- the machine speed may be greater than about 800 m / min, preferably greater than about 1000 m / min for wood-free paper types, and in particular greater than about 1200 m / min, preferably greater than 1500 m / min for wood-containing papers.
- the fibrous web in the press section should preferably not be in contact with a smooth press roll and only in the dry section after reaching a relatively high moisture content and correspondingly sufficient strength, i. After the impingement blower (s) come into contact with a smooth drying cylinder. It is thus ruled out that, when detaching from a smooth lateral surface, undesired stretching of the fibrous web can occur.
- the sole figure of the drawing shows a schematic partial representation of a drying section 10 of a machine for producing a fibrous web, which may be in particular a paper, board or tissue web.
- the fibrous web starting from the last press nip 12 of a press section 14 via a straight transfer section 16, for example, which may also be slightly curved, leads to a first, in particular larger, support roller 18 with associated impingement dryer 20.
- a larger back-up roll is meant, for example, a back-up roll whose diameter is greater than the diameter of a conventional drying cylinder.
- such a larger support roller has a diameter of at least 3 m.
- the support roller 18 is looped by a sieve 22.
- the fibrous web guided around the sieve-like support roll 18 is subjected to a hot-air and / or superheated steam flow by the impingement-flow dryer 20.
- the first back-up roll 18 is an upper back-up roll, i. the fibrous web is supplied to this roller from bottom to top and removed from top to bottom of this roller again.
- the impingement flow dryer 20 is e.g. arranged in the upper region of this first support roller 18.
- the transfer section 16 is formed by a screen 28 guided around two suction rollers 24, 26, to which one or more foil and / or vacuum boxes 30 are assigned to hold the fibrous web on the wire 28.
- the first suction roll 24 removes the fibrous web from a press belt or felt running out of the press nip 12, while the second suction roll 26 holds the fibrous web only during the deflection around this roll. In the area of the first suction roll 24, the fibrous web can also be removed, for example, from a transfer belt.
- a second, in particular larger support roller 34 is provided with associated impingement dryer 36.
- the Faser ⁇ is fabric without pick-up suction directly from the first support roller 18 to ⁇ twining wire 22 to which the second support roller 34 wrapping around screen 38 or transferred directly to the sieve wrap around second support roller 34. In the present case, the transfer takes place immediately before the second support roller 34.
- the surrounding looping region can be variably adjustable via an adjustable roller 40 arranged within the loop of the supporting roller screen 22.
- the two support rollers 18, 34 are as well as the two boxes 30 each acted upon by vacuum.
- the second back-up roll 34 is a lower roll, i. the fibrous web is supplied to this roll from top to bottom and removed from bottom to top of this roll.
- the impingement-flow dryer 36 is here arranged in the region of the lower right quadrant of the support roller 34.
- the two support rollers 18, 34, each with associated impingement flow dryers 20, 36 can thus be arranged directly downstream of the press section 14 and upstream of a cylinder drying section 42, viewed in the web running direction.
- the two impingement-type dryers 20, 36 may each comprise a hot-air and / or superheated steam hood 44, 46.
- the transfer line 16 is horizontal. In principle, however, it may also be slightly inclined to the horizontal.
Landscapes
- Paper (AREA)
- Drying Of Solid Materials (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004054886A DE102004054886A1 (en) | 2004-11-12 | 2004-11-12 | drying section |
PCT/EP2005/053783 WO2006051005A1 (en) | 2004-11-12 | 2005-08-03 | Drier section |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1819872A1 true EP1819872A1 (en) | 2007-08-22 |
EP1819872B1 EP1819872B1 (en) | 2011-04-20 |
Family
ID=35094655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05773999A Not-in-force EP1819872B1 (en) | 2004-11-12 | 2005-08-03 | Drier section |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1819872B1 (en) |
CN (1) | CN101057030A (en) |
AT (1) | ATE506485T1 (en) |
DE (2) | DE102004054886A1 (en) |
WO (1) | WO2006051005A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008042282A1 (en) | 2008-09-23 | 2010-03-25 | Voith Patent Gmbh | Machine for producing e.g. paper web, has suction roller arranged in conveying tension belt downstream to delivery region and movable from operating position into another operating position under opening of delivery region |
CN109442943B (en) * | 2018-10-22 | 2020-07-03 | 江苏盛斯达纺织科技有限公司 | Textile drying equipment in shed |
CN110595179B (en) * | 2019-10-11 | 2020-12-18 | 高密市家诚机械科技有限公司 | Heating method of rotary drying drum of textile equipment and drying equipment |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5678321A (en) * | 1995-09-12 | 1997-10-21 | Beloit Technologies, Inc. | Air caps for two tier double felted dryer |
FI104000B (en) * | 1998-04-03 | 1999-10-29 | Valmet Corp | Blowing device arranged around a roller, cylinder or equivalent in a paper machine or corresponding drying portion |
DE69922041T2 (en) | 1998-08-04 | 2005-10-13 | Metso Paper, Inc. | METHOD AND DEVICE FOR TREATING PAPER OR PAPER WEBSTS |
DE19935138A1 (en) | 1998-09-11 | 2000-05-04 | Voith Sulzer Papiertech Patent | Fiber web drying section with a deflection flow dryer, with good drying rate, shortest web drying path and trouble-free web movement through the drying stage |
DE19841768A1 (en) | 1998-09-11 | 2000-03-16 | Voith Sulzer Papiertech Patent | Dryer section |
FI20002628A0 (en) * | 2000-11-30 | 2000-11-30 | Valmet Corp | Method and apparatus in a paper or board machine |
FI111092B (en) * | 2001-06-26 | 2003-05-30 | Metso Automation Oy | A method for blowing drying gas against a paper web and a paper machine blow dryer |
-
2004
- 2004-11-12 DE DE102004054886A patent/DE102004054886A1/en not_active Withdrawn
-
2005
- 2005-08-03 CN CNA2005800385747A patent/CN101057030A/en active Pending
- 2005-08-03 AT AT05773999T patent/ATE506485T1/en active
- 2005-08-03 EP EP05773999A patent/EP1819872B1/en not_active Not-in-force
- 2005-08-03 DE DE502005011290T patent/DE502005011290D1/en active Active
- 2005-08-03 WO PCT/EP2005/053783 patent/WO2006051005A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2006051005A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1819872B1 (en) | 2011-04-20 |
DE102004054886A1 (en) | 2006-05-18 |
CN101057030A (en) | 2007-10-17 |
DE502005011290D1 (en) | 2011-06-01 |
WO2006051005A1 (en) | 2006-05-18 |
ATE506485T1 (en) | 2011-05-15 |
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