EP2157034A1 - Process belt, method for producing paper or non-woven fabric and use of a process belt - Google Patents
Process belt, method for producing paper or non-woven fabric and use of a process belt Download PDFInfo
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- EP2157034A1 EP2157034A1 EP09010665A EP09010665A EP2157034A1 EP 2157034 A1 EP2157034 A1 EP 2157034A1 EP 09010665 A EP09010665 A EP 09010665A EP 09010665 A EP09010665 A EP 09010665A EP 2157034 A1 EP2157034 A1 EP 2157034A1
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- European Patent Office
- Prior art keywords
- process belt
- belt according
- band
- belt
- charging
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 96
- 230000008569 process Effects 0.000 title claims abstract description 95
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000004745 nonwoven fabric Substances 0.000 title description 7
- 239000004033 plastic Substances 0.000 claims abstract description 8
- 229920003023 plastic Polymers 0.000 claims abstract description 8
- 230000006698 induction Effects 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000000835 fiber Substances 0.000 description 7
- 238000003466 welding Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 229910000906 Bronze Inorganic materials 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007717 exclusion Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/0027—Screen-cloths
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
Definitions
- the invention relates to a process belt for nonwoven or papermaking.
- Nonwoven or papermaking process belts are used in web forming, nonwoven bonding, and nonwoven finishing and finishing.
- Nonwovens owe their origin to the textile, paper, plastic, and leather industries.
- the ever increasing demand for nonwoven products poses a challenge to the production of raw materials and machinery as well as to producers and processors of nonwovens.
- nonwoven fabric A precise definition of the term nonwoven fabric has been defined by the International Organization for Standardization (ISO 9092, 1988) and the European standard exclusion (EN-29092).
- nonwoven production such as web forming, nonwoven bonding and nonwoven finishing and finishing, are performed either individually or in a continuous process.
- the production of nonwoven materials begins with the planar or voluminous arrangement of the fibers. These can either - depending on the wet or dry technology - either made of staple fiber (packed in bales or sacks) or of filaments (spun or melted polymer granules).
- non-woven fabrics are covered with PES ribbons, double-layered with woven-in seam and edge coating, PES ribbons, single-layer, woven and edge coated, bronze ribbons, smooth, with endless soldering seams and 1 ⁇ 2-twisted cast steel strips with soldered seams and edge welding.
- Especially suitable for drying are 1 ⁇ 2-twisted VA tapes with soldered seams and edge welding.
- the following tapes are preferably used for web formation: PES tapes, smooth weave or 2/1 body, as open as possible, with endless woven seam and edge coating and 1 ⁇ 2 - twisted or smooth VA tapes, as open as possible, with soldered seam and edge weld , Particularly suitable for fixation are 1 ⁇ 2-twisted VA tapes with soldered seams and edge welding, and especially suitable for drying are 1 ⁇ 2-twisted VA tapes, 3-stranded, with soldered seam and edge weld.
- PTFE-coated leno cloths are reinforced with potted seam and adhesive seam for fleece formation
- Edges and duofil tapes used with flat seam and edge coating.
- PTFE-coated leno fabrics with seams and edge coating, duofil tapes, with flat seams and edge coating as well as cam belts with seams and edge coating are used.
- Hot air melting is often combined with a spunbonding process.
- the final consolidation takes place both via a dryer belt in a hot air oven and by circulation over a hot air drum or via a calender roll.
- the most suitable processing belts for web forming are PES tapes, double-layered, with woven-in seam and edge coating, PES tapes, single-ply, with woven seam and edge coating, bronze tapes, smooth, with endless soldered seams, 1 ⁇ 2-twisted cast steel strips, with soldered seams and edge welding.
- For drying preferably 1 ⁇ 2-twisted VA tapes with soldered seam and edge welding are used.
- the invention is therefore based on the object to improve the treatment of nonwoven materials on process belts.
- This object is achieved with a process belt for nonwoven or papermaking having an electrical means for electrically charging the process belt.
- Process belts have either been grounded by the mechanical arrangement or, due to their design and operation during their use, they receive a special uncontrolled charge. In both cases, the loading of the process belt affects the process of nonwoven production. This charge can be tolerated as a disadvantageous technical disadvantage of the system.
- the invention is based on the knowledge to consciously influence the electrical charge of the process band in order to influence the process of nonwoven production.
- the device for electrically charging a process band may consist of measuring and regulating the system-related electrical charge of the band.
- the process belt can be actively charged electrically as desired for the nonwoven manufacturing process. Again, of course, a control or regulation of advantage.
- the device has a grinder.
- the process band can be charged across its entire width, in specific areas transverse to the band stretching or in special areas along the band stretching.
- the device has a conductive roller or conductive rings.
- the process band can be charged locally or over its entire width in a simple manner.
- Non-contact charging of a process band is achieved with a device having induction means. With these induction means, a charge can be generated locally at locations of the process band or in the entire process band according to predetermined requirements.
- Non-contact charging of the process belt can also be carried out by means of corona charging or by means of ionizing bars.
- the device has means for the targeted generation of triboelectric charging.
- natural charging processes can be favored or directed so that the charge is in the desired shape at the desired location.
- the use of triboelectric charging is promoted by the moving belts and the contact and the separation of materials such as roller, belt and fleece.
- an electrical charging process can be achieved by the contact and the separation of two materials, which favors the production of nonwovens.
- the process belt has a conductive plastic.
- Plastics are particularly suitable for holding electric charges and generating them by means of a triboelectric effect.
- the process strip has a metal part and a plastic part.
- the metal part can be provided in particular in the form of wires and / or ropes, while the plastic part is provided in particular in the form of monofilament fibers and / or multifilament fibers. Especially this combination of materials leads to a favorable behavior with regard to the electrical charge.
- a charge that is opposite to the process material can be charged present in the volume.
- the process material is pulled onto the belt. This in turn can promote compaction of the process material and it can be prevented that the process material floats dust-like as thin fibers in space and does not reach the belt.
- the opposite polarity charging also allows a loading of the band in the area of the deflection roller or even on the underside of the belt, since it is no longer necessary for the process material to fall onto the belt due to its weight force.
- the band can also be arranged in a different position from the horizontal position.
- a simple construction of a process band provides that the device has a direct current source.
- This DC power source can be used to charge the tape and is preferably used where a specific charge of the tape is desired.
- the device may comprise an AC power source.
- Another area of application for the electrical charging of the process belt is at the transfer area. It is therefore suggested that the Charging targeted in a transfer area to another band or another part of the plant is generated.
- the transfer can be significantly improved by electrostatic attraction and repulsion forces.
- the object underlying the invention is also achieved with a method for producing paper or nonwoven, wherein a process belt, in particular according to the above-mentioned embodiments, selectively charged electrically.
- the object is achieved by using such a process band to perform a process with complete or local electrical charging of the process band.
- Embodiments of the process tape according to the invention vary depending on the use of the tape in the web formation, nonwoven bonding or fleece equipment and processing.
- at least one process band is completely or even locally according to the predetermined Requirements electrically charged, so that an improvement in the nonwoven production is achieved by the electrostatic forces.
- different bands of different materials can be used and the electrical charge can be applied by triboelectric effects inductively or by sliding contacts on the strip material.
Abstract
Description
Die Erfindung betrifft ein Prozessband für die Nonwoven- oder Papierherstellung. Prozessbänder für die Nonwoven- oder Papierherstellung werden bei der Vliesbildung, der Vliesverfestigung und der Vliesausrüstung und -bearbeitung eingesetzt.The invention relates to a process belt for nonwoven or papermaking. Nonwoven or papermaking process belts are used in web forming, nonwoven bonding, and nonwoven finishing and finishing.
Vliesstoffe verdanken ihre Entstehung der Textil-, Papier-, Kunststoff-, und Lederindustrie. Die stetig steigende Nachfrage für Vliesstoffprodukte bildet eine Herausforderung an die Herstellung von Rohmaterialien und Maschinen ebenso wie an Produzenten und Verarbeiter von Vliesstoffen.Nonwovens owe their origin to the textile, paper, plastic, and leather industries. The ever increasing demand for nonwoven products poses a challenge to the production of raw materials and machinery as well as to producers and processors of nonwovens.
Eine präzise Definition des Begriffs Vliesstoff wurde von der internationalen Organisation für Standardisierung (ISO 9092, 1988) und dem europäischen Normenausschluss (EN-29092) festgelegt.A precise definition of the term nonwoven fabric has been defined by the International Organization for Standardization (ISO 9092, 1988) and the European standard exclusion (EN-29092).
Die drei Stufen der Vliesproduktion wie Vliesbildung, Vliesverfestigung und Vliesausrüstung und -bearbeitung werden entweder einzeln oder in einem kontinuierlichen Prozess durchgeführt. Die Herstellung von Vliesmaterialien beginnt mit der flächigen oder voluminösen Anordnung der Fasern. Diese können - je nach Nass- oder Trocken-Technologie - entweder aus Stapelfaser (verpackt in Ballen oder Säcken) oder aus Filamenten (gesponnen oder geschmolzenen Polymer-Granulaten) bestehen.The three stages of nonwoven production, such as web forming, nonwoven bonding and nonwoven finishing and finishing, are performed either individually or in a continuous process. The production of nonwoven materials begins with the planar or voluminous arrangement of the fibers. These can either - depending on the wet or dry technology - either made of staple fiber (packed in bales or sacks) or of filaments (spun or melted polymer granules).
Für die Vliesbildung werden grundsätzlich sechs verschiedene Verfahren zur Herstellung eines Faserflors verwendet: Nassvliesverfahren, Luftstromverfahren, Trockenvliesverfahren, Spinnvliesverfahren, Heißluftschmelzverfahren und Kombiverfahren.For web formation, basically six different processes are used to make a batt: wet web process, air flow process, dry nonwoven process, spunbond process, hot air melt process and combination process.
Beim Spinnvliesverfahren werden für die Vliesbildung PES-Bänder, doppellagig mit angewebter Stecknaht und Randbeschichtung, PES-Bänder, einlagig, mit Webnaht und Randbeschichtung, Bronzebänder, glatt, mit Endlos-Lötnaht und ½ -drillierte Gussstahl-Bänder mit Lötnaht und Randschweißung verwendet. Für die Trocknung eignen sich vor allem ½ -drillierte VA-Bänder mit Lötnaht und Randschweißung.In the spunbonding process, non-woven fabrics are covered with PES ribbons, double-layered with woven-in seam and edge coating, PES ribbons, single-layer, woven and edge coated, bronze ribbons, smooth, with endless soldering seams and ½-twisted cast steel strips with soldered seams and edge welding. Especially suitable for drying are ½-twisted VA tapes with soldered seams and edge welding.
Beim Luftstromverfahren werden für die Vliesbildung bevorzugt folgende Bänder eingesetzt: PES-Bänder, glatte Bindung oder 2/1-Körper, möglichst offen, mit Endlos-Webnaht und Randbeschichtung sowie ½ - drillierte oder glatte VA-Bänder, möglichst offen, mit Lötnaht und Randschweißung. Für die Fixierung eignen sich besonders ½ -drillierte VA-Bänder mit Lötnaht und Randschweißung und für die Trocknung eigenen sich besonders ½ -drillierte VA-Bänder, 3-kettig, mit Lötnaht und Randschweißung.In the air flow method, the following tapes are preferably used for web formation: PES tapes, smooth weave or 2/1 body, as open as possible, with endless woven seam and edge coating and ½ - twisted or smooth VA tapes, as open as possible, with soldered seam and edge weld , Particularly suitable for fixation are ½-twisted VA tapes with soldered seams and edge welding, and especially suitable for drying are ½-twisted VA tapes, 3-stranded, with soldered seam and edge weld.
Bei Trockenvliesverfahren werden für die Vliesbildung insbesondere PTFE-beschichtete Drehergewebe mit Stecknaht und Klebenahtverstärkten Rändern und Duofil-Bänder, mit flacher Stecknaht und Randbeschichtung eingesetzt. Im Rahmen der Trocknung werden PTFE-beschichtete Drehergewebe mit Stecknaht und Randbeschichtung, Duofil-Bänder, mit flacher Stecknaht und Randbeschichtung sowie Nockenbänder mit Stecknaht und Randbeschichtung eingesetzt.In the case of dry nonwoven processes, in particular PTFE-coated leno cloths are reinforced with potted seam and adhesive seam for fleece formation Edges and duofil tapes, used with flat seam and edge coating. As part of the drying process, PTFE-coated leno fabrics with seams and edge coating, duofil tapes, with flat seams and edge coating as well as cam belts with seams and edge coating are used.
Das Heißluftschmelzverfahren wird häufig mit einem Spinnvliesverfahren kombiniert. Man unterscheidet hierbei zweilagige Meltblown-Prozesse und dreilagige Kombi-Verfahren. Dabei geschieht die Endverfestigung sowohl über ein Trocknerband im Heißluftofen als auch durch Umlauf über eine Heißlufttrommel oder über eine Kalanderwalze. Als Prozessbänder für die Vliesbildung eigenen sich vor allem PES-Bänder, doppellagig, mit angewebter Stecknaht und Randbeschichtung, PES-Bänder, einlagig, mit Webnaht und Randbeschichtung, Bronzebänder, glatt, mit Endlos-Lötnaht, ½ -drillierte Gussstahl-Bänder, mit Lötnaht und Randschweißung. Für die Trocknung werden bevorzugt ½ -drillierte VA-Bänder mit Lötnaht und Randschweißung eingesetzt.Hot air melting is often combined with a spunbonding process. A distinction is made here between two-layer meltblown processes and three-layer combination processes. The final consolidation takes place both via a dryer belt in a hot air oven and by circulation over a hot air drum or via a calender roll. The most suitable processing belts for web forming are PES tapes, double-layered, with woven-in seam and edge coating, PES tapes, single-ply, with woven seam and edge coating, bronze tapes, smooth, with endless soldered seams, ½-twisted cast steel strips, with soldered seams and edge welding. For drying, preferably ½-twisted VA tapes with soldered seam and edge welding are used.
Alle diese Verfahren zur Vliesbildung, Verfestigung und Ausrüstung sowie Bearbeitung laufen auf speziellen Prozessbändern. Hierbei werden hohe Anforderungen an das Ablageverhalten und die Ausrichtung der Fasern gestellt.All of these processes for web formation, consolidation and equipment as well as processing run on special processing belts. Here, high demands are placed on the storage behavior and the orientation of the fibers.
Der Erfindung liegt daher die Aufgabe zugrunde, die Behandlung von Vliesmaterialien auf Prozessbändern verbessern.The invention is therefore based on the object to improve the treatment of nonwoven materials on process belts.
Diese Aufgabe wird mit einem Prozessband für die Nonwoven- oder Papierherstellung gelöst, das eine elektrische Einrichtung zum elektrischen Aufladen des Prozessbands aufweist.This object is achieved with a process belt for nonwoven or papermaking having an electrical means for electrically charging the process belt.
Prozessbänder sind bisher entweder durch die maschinelle Anordnung an Masse gelegt oder sie erhalten durch ihre Konstruktion und ihren Betrieb während ihres Einsatzes eine spezielle unkontrollierte Ladung. In beiden Fällen wirkt sich die Ladung des Prozessbandes auf den Prozess der Vliesstoffherstellung aus. Diese Ladung kann als hinzunehmender technischer Nachteil der Anlage geduldet werden. Der Erfindung liegt jedoch die Erkenntnis zugrunde, die elektrische Aufladung des Prozessbands bewusst zu beeinflussen, um damit auf den Vorgang der Vliesherstellung einzuwirken.Process belts have either been grounded by the mechanical arrangement or, due to their design and operation during their use, they receive a special uncontrolled charge. In both cases, the loading of the process belt affects the process of nonwoven production. This charge can be tolerated as a disadvantageous technical disadvantage of the system. However, the invention is based on the knowledge to consciously influence the electrical charge of the process band in order to influence the process of nonwoven production.
Die Einrichtung zum elektrischen Aufladen eines Prozessbands kann aus Messung und Regelung der systembedingten elektrischen Aufladung des Bands bestehen. Alternativ oder kumulativ kann das Prozessband aktiv elektrisch so aufgeladen werden, wie es für den Vliesherstellungsprozess gewünscht wird. Auch hierbei ist selbstverständlich eine Steuerung oder Regelung von Vorteil.The device for electrically charging a process band may consist of measuring and regulating the system-related electrical charge of the band. Alternatively or cumulatively, the process belt can be actively charged electrically as desired for the nonwoven manufacturing process. Again, of course, a control or regulation of advantage.
Um ein Prozessband kostengünstig aufzuladen wird vorgeschlagen, dass die Einrichtung einen Schleifer aufweist. Je nach Ausbildung des Schleifers kann damit das Prozessband über seine gesamte Breite, in speziellen Bereichen quer zur Banderstreckung oder in speziellen Bereichen längs zur Banderstreckung aufgeladen werden.In order to charge a process belt cost-effective, it is proposed that the device has a grinder. Depending on the design of the grinder so that the process band can be charged across its entire width, in specific areas transverse to the band stretching or in special areas along the band stretching.
Alternativ oder kumulativ kann vorgesehen sein, dass die Einrichtung eine leitfähige Walze oder leitfähige Ringe aufweist. Dadurch kann auf einfache Art und Weise das Prozessband lokal oder über seine gesamte Breite aufgeladen werden.Alternatively or cumulatively, it can be provided that the device has a conductive roller or conductive rings. As a result, the process band can be charged locally or over its entire width in a simple manner.
Ein berührungsloses Aufladen eines Prozessbands wird mit einer Einrichtung erreicht, die Induktionsmittel aufweist. Mit diesen Induktionsmitteln kann eine Ladung lokal an Stellen des Prozessbands oder im gesamten Prozessband nach vorgegebenen Anforderungen erzeugt werden.Non-contact charging of a process band is achieved with a device having induction means. With these induction means, a charge can be generated locally at locations of the process band or in the entire process band according to predetermined requirements.
Das berührungslose Aufladen des Prozessbandes kann auch mit Hilfe von Coronaaufladung oder mittels Ionisationsstäben erfolgen.Non-contact charging of the process belt can also be carried out by means of corona charging or by means of ionizing bars.
Weiterhin wird vorgeschlagen, dass die Einrichtung Mittel zum gezielten Hervorrufen triboelektrischer Aufladung aufweist. Dadurch können natürliche Aufladeprozesse begünstigt werden, oder so geleitet werden, dass die Ladung in der gewünschten Form am gewünschten Ort vorliegt. Die Verwendung triboelektrischer Aufladung wird durch die bewegten Bänder und den Kontakt und das Trennen von Materialien wie Walze, Band und Vlies begünstigt. Durch gezielte Materialwahl kann durch den Kontakt und das Trennen von zwei Materialien ein elektrischer Aufladungsprozess erzielt werden, der die Vliesherstellung begünstigt.Furthermore, it is proposed that the device has means for the targeted generation of triboelectric charging. As a result, natural charging processes can be favored or directed so that the charge is in the desired shape at the desired location. The use of triboelectric charging is promoted by the moving belts and the contact and the separation of materials such as roller, belt and fleece. Through targeted choice of materials, an electrical charging process can be achieved by the contact and the separation of two materials, which favors the production of nonwovens.
Gute Ergebnisse wurden mit Prozessbändern erzielt, die ein Metall aufweisen. Metallbänder begünstigen die Verteilung der Ladung auf der Fläche des Bands.Good results have been achieved with process belts that have a metal. Metal bands favor the distribution of charge on the surface of the tape.
Vorteilhaft kann es jedoch auch sein, wenn das Prozessband einen leitfähigen Kunststoff aufweist. Kunststoff sind besonders dazu geeignet elektrische Ladungen zu halten und mittels eines triboelektrischen Effekts zu erzeugen.However, it may also be advantageous if the process belt has a conductive plastic. Plastics are particularly suitable for holding electric charges and generating them by means of a triboelectric effect.
Daher wird weiterhin vorgeschlagen, dass das Prozessband einen Metallteil und einen Kunststoffteil aufweist. Der Metallteil kann insbesondere in Form von Drähten und/oder Seilen bereitgestellt werden, während der Kunststoffteil insbesondere in Form von monofilen Fasern und/oder multifilien Fasern bereit gestellt wird. Gerade diese Kombination der Materialien führt zu einem günstigen Verhalten im Hinblick auf die elektrische Aufladung.Therefore, it is further proposed that the process strip has a metal part and a plastic part. The metal part can be provided in particular in the form of wires and / or ropes, while the plastic part is provided in particular in the form of monofilament fibers and / or multifilament fibers. Especially this combination of materials leads to a favorable behavior with regard to the electrical charge.
Um die Auflagekräfte des Prozessguts am Band zu vermindern, wird vorgeschlagen, dass eine mit Prozessgut gleichgepolte Aufladung im Band vorliegt. Das Band hat damit die gleiche Ladung wie das Prozessgut und da sich gleiche Ladungen abstoßen, führt dies dazu, dass diese Abstoßungskräfte beispielsweise den Gewichtskräften des Prozessguts entgegenwirken können. Bei dem über dem Band angeordneten Prozessgut kann dies die Auflagekräfte des Prozessguts vermindern und im Extremfall sogar zu einem leichten Schweben des Prozessguts oberhalb des Prozessbands führen. Die Verringerung der Auflagekräfte kann auch das Ausrichten der Fasern begünstigen.In order to reduce the contact forces of the process material on the belt, it is proposed that there is a charge in the belt which is the same polarity with process material. The belt thus has the same charge as the process material and since the same charges repel, this leads to the fact that these repulsion forces can counteract, for example, the weight forces of the process material. In the case of the process material arranged above the belt, this can reduce the bearing forces of the process material and, in extreme cases, even lead to a slight hovering of the process material above the process belt. The reduction of the bearing forces can also favor the alignment of the fibers.
Alternativ zur gleichpoligen Aufladung oder in anderen Bereichen des Bands kann eine zum Prozessgut entgegengesetzt gepolte Aufladung im Band vorliegen. Dies führt dazu, dass in den Bereichen der zum Prozessgut entgegengesetzt gepolten Aufladung am Band, das Prozessgut an das Band gezogen wird. Dies wiederum kann eine Verdichtung des Prozessguts begünstigen und es kann verhindert werden, dass Prozessgut staubförmig als dünne Fasern im Raum schwebt und nicht auf das Band gelangt. Die entgegengesetzt gepolte Aufladung ermöglicht auch eine Beladung des Bands im Bereich der Umlenkrolle oder sogar an der Bandunterseite, da es nicht mehr notwendig ist, dass das Prozessgut durch seine Gewichtskraft auf das Band fällt. Dadurch kann das Band auch in einer von der waagerechten Lage abweichenden Lage angeordnet werden.As an alternative to charging with the same polarity or in other areas of the band, a charge that is opposite to the process material can be charged present in the volume. As a result, in the areas of the charging opposite to the process material, the process material is pulled onto the belt. This in turn can promote compaction of the process material and it can be prevented that the process material floats dust-like as thin fibers in space and does not reach the belt. The opposite polarity charging also allows a loading of the band in the area of the deflection roller or even on the underside of the belt, since it is no longer necessary for the process material to fall onto the belt due to its weight force. As a result, the band can also be arranged in a different position from the horizontal position.
Eine einfache Ausbildung eines Prozessbands sieht vor, dass die Einrichtung eine Gleichstromquelle aufweist. Diese Gleichstromquelle kann zum Aufladen des Bands genutzt werden und sie wird vorzugsweise dort eingesetzt, wo eine spezielle Aufladung des Bands gewünscht wird.A simple construction of a process band provides that the device has a direct current source. This DC power source can be used to charge the tape and is preferably used where a specific charge of the tape is desired.
Insbesondere zum Heizen des Bands wird vorgeschlagen, dass die Einrichtung eine Wechselstromquelle aufweisen kann.In particular for heating the tape, it is proposed that the device may comprise an AC power source.
Versuche haben gezeigt, dass es besonders vorteilhaft ist, wenn die Aufladung gezielt im Ablagebereich des Prozessguts erzeugt wird. Dies verbessert das Ablegen in der Forming area und beschleunigt daher die Vliesbildung.Experiments have shown that it is particularly advantageous if the charge is generated specifically in the storage area of the process material. This improves deposition in the forming area and therefore speeds up web formation.
Ein weiterer Einsatzbereich der elektrischen Aufladung des Prozessbands liegt am Übergabebereich. Es wird daher vorgeschlagen, dass die Aufladung gezielt in einem Übergabebereich an ein weiteres Band oder einen anderen Anlagenteil erzeugt wird. Hier kann durch elektrostatische Anziehungs- und Abstoßungskräfte die Übergabe deutlich verbessert werden.Another area of application for the electrical charging of the process belt is at the transfer area. It is therefore suggested that the Charging targeted in a transfer area to another band or another part of the plant is generated. Here, the transfer can be significantly improved by electrostatic attraction and repulsion forces.
Um lokal unterschiedliche Aufladungen zu erzeugen, wird vorgeschlagen, dass nur ein funktioneller Teil des Prozessbands aufgeladen wird. So wird beispielsweise vorgeschlagen, dass bei einem Prozessband nur alle oder nur spezielle Schüsse elektrisch aufgeladen werden. Anderseits können auch nur spezielle Ketten, wie beispielsweise die Ketten am Rand des Prozessbands elektrisch aufgeladen werden, um die Vliesbildung in diesen Bereichen besonders zu beeinflussen.To generate locally different charges, it is proposed that only one functional part of the process band be charged. For example, it is proposed that in a process belt only all or only special shots are electrically charged. On the other hand, only special chains, such as, for example, the chains at the edge of the process belt, can be electrically charged in order to influence the formation of nonwoven fabric in these areas in particular.
Die der Erfindung zugrunde liegende Aufgabe wird auch mit einem Verfahren zum Herstellen von Papier oder Vlies gelöst, wobei ein Prozessband, insbesondere gemäß den oben genannten Ausführungen, gezielt elektrisch aufgeladen wird.The object underlying the invention is also achieved with a method for producing paper or nonwoven, wherein a process belt, in particular according to the above-mentioned embodiments, selectively charged electrically.
Außerdem wird die Aufgabe durch eine Verwendung eines derartigen Prozessbands zum Durchführen eines Prozesses unter vollständiger oder lokaler elektrischer Aufladung des Prozessbands gelöst.In addition, the object is achieved by using such a process band to perform a process with complete or local electrical charging of the process band.
Ausführungsbeispiele des erfindungsgemäßen Prozessbands variieren je nach Einsatz des Bands bei der Vliesbildung, Vliesverfestigung oder der Vliesausrüstung und -bearbeitung. Hierbei wird mindestens ein Prozessband vollständig oder auch nur lokal entsprechend den vorgegebenen Anforderungen elektrisch aufgeladen, so dass durch die elektrostatischen Kräfte eine Verbesserung bei der Vliesherstellung erzielt wird.Embodiments of the process tape according to the invention vary depending on the use of the tape in the web formation, nonwoven bonding or fleece equipment and processing. In this case, at least one process band is completely or even locally according to the predetermined Requirements electrically charged, so that an improvement in the nonwoven production is achieved by the electrostatic forces.
Hierbei können unterschiedliche Bänder aus unterschiedlichen Materialien Einsatz finden und die elektrische Ladung kann durch triboelektrische Effekte induktiv oder durch Schleifkontakte auf das Bandmaterial aufgebracht werden.Here, different bands of different materials can be used and the electrical charge can be applied by triboelectric effects inductively or by sliding contacts on the strip material.
Claims (17)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008039245 | 2008-08-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2157034A1 true EP2157034A1 (en) | 2010-02-24 |
Family
ID=41461116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09010665A Withdrawn EP2157034A1 (en) | 2008-08-22 | 2009-08-19 | Process belt, method for producing paper or non-woven fabric and use of a process belt |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20100043992A1 (en) |
| EP (1) | EP2157034A1 (en) |
| CA (1) | CA2676304A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2221414A1 (en) | 2009-02-20 | 2010-08-25 | Voith Patent GmbH | Transfer belt for transferring a strip of paper or cardboard and device for transferring a strip of paper or cardboard |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0455241A (en) * | 1990-06-25 | 1992-02-21 | Ricoh Co Ltd | Belt conveyor |
| US5397438A (en) * | 1990-07-06 | 1995-03-14 | Valmet Paper Machinery, Inc. | Method and device for reduction and equalization of transverse shrinkage of paper in single-wire draw in a drying section |
| JPH07125865A (en) * | 1993-11-08 | 1995-05-16 | Abisare:Kk | Electrostatic attraction belt conveyor |
| EP0950744A1 (en) * | 1998-04-17 | 1999-10-20 | Polymer Group, Inc. | Improvements in the production of nonwoven webs using electrostatically charge conveyor belt |
| EP1777183A1 (en) * | 2005-10-19 | 2007-04-25 | Asselin-Thibeau | Electrostatic device for chucking a web of non-woven fabric in contact with an overlying surface |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3633282A (en) * | 1969-03-17 | 1972-01-11 | Robert R Candor | Liquid-removing apparatus and method |
| US4055459A (en) * | 1976-06-28 | 1977-10-25 | Jwi Ltd. | Method and apparatus for preventing the adherence of polarized foreign particles to paper machine components |
| US4319407A (en) * | 1979-10-16 | 1982-03-16 | Candor James T | Method and apparatus for electrostatically forming a layer of material from a slurry thereof |
-
2009
- 2009-08-19 EP EP09010665A patent/EP2157034A1/en not_active Withdrawn
- 2009-08-21 CA CA2676304A patent/CA2676304A1/en not_active Abandoned
- 2009-08-21 US US12/583,502 patent/US20100043992A1/en not_active Abandoned
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0455241A (en) * | 1990-06-25 | 1992-02-21 | Ricoh Co Ltd | Belt conveyor |
| US5397438A (en) * | 1990-07-06 | 1995-03-14 | Valmet Paper Machinery, Inc. | Method and device for reduction and equalization of transverse shrinkage of paper in single-wire draw in a drying section |
| JPH07125865A (en) * | 1993-11-08 | 1995-05-16 | Abisare:Kk | Electrostatic attraction belt conveyor |
| EP0950744A1 (en) * | 1998-04-17 | 1999-10-20 | Polymer Group, Inc. | Improvements in the production of nonwoven webs using electrostatically charge conveyor belt |
| EP1777183A1 (en) * | 2005-10-19 | 2007-04-25 | Asselin-Thibeau | Electrostatic device for chucking a web of non-woven fabric in contact with an overlying surface |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2221414A1 (en) | 2009-02-20 | 2010-08-25 | Voith Patent GmbH | Transfer belt for transferring a strip of paper or cardboard and device for transferring a strip of paper or cardboard |
Also Published As
| Publication number | Publication date |
|---|---|
| US20100043992A1 (en) | 2010-02-25 |
| CA2676304A1 (en) | 2010-02-22 |
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