EP0054206A1 - Dryer-felt for the dryer section of paper machines - Google Patents

Dryer-felt for the dryer section of paper machines Download PDF

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Publication number
EP0054206A1
EP0054206A1 EP81109962A EP81109962A EP0054206A1 EP 0054206 A1 EP0054206 A1 EP 0054206A1 EP 81109962 A EP81109962 A EP 81109962A EP 81109962 A EP81109962 A EP 81109962A EP 0054206 A1 EP0054206 A1 EP 0054206A1
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EP
European Patent Office
Prior art keywords
threads
fibers
metal
metal fibers
dry felt
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Granted
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EP81109962A
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German (de)
French (fr)
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EP0054206B1 (en
Inventor
Giovanni Geschmay
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FELTRIFICIO VENETO SpA
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FELTRIFICIO VENETO SpA
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    • 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths
    • 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
    • D21F1/10—Wire-cloths
    • 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
    • D21F1/10—Wire-cloths
    • D21F1/105—Multi-layer wire-cloths

Definitions

  • the residual water of the moist paper web leaving the wet presses of a paper machine is known to be evaporated in the subsequent drying section of the paper machine.
  • the paper web is guided around heated, rotating drying cylinders.
  • Continuous, endless drying cloths, so-called drying felts, ensure that the paper web is in good contact with the drying cylinders.
  • the known dry felts consist exclusively of natural and / or artificial or synthetic textile materials and have a correspondingly small heat capacity.
  • the residual water evaporated from the paper web therefore condenses in part in the dry felt.
  • the dry felt can also be dried.
  • the dwell time of the paper web in the drying section of the paper machine ie the drying time of the paper web, is undesirably extended.
  • the object of the invention is to eliminate these disadvantages of the known designs and to reduce the drying time, i.e. to reduce the running time of the paper web through the dryer section of a paper machine.
  • This object is achieved according to the invention with a dry felt for the dryer section of paper machines, which is characterized in that it contains metal fibers.
  • the dry felt according to the invention in turn acts as an additional heat source, since it emits the heat absorbed and stored by the drying cylinders evenly distributed to the outer side of the paper web facing away from the drying cylinders.
  • the drying performance of the dryer section of the paper machine is increased compared to conventional dryer felts and the dwell time of the paper web in the dryer section is reduced accordingly.
  • the paper quality is also likely to be improved. All of these advantages are achieved without increasing the operating costs, ie only through the simple use of the dry felt according to the invention.
  • the metal fibers can be used in connection with all the materials previously used for the production of such dry cloths or dry felts, in particular in connection with natural and / or artificial or synthetic fibers, such as e.g. Textile fibers, glass fibers or the like can be used.
  • This connection of the metal fibers with non-metallic fibers ensures a high flexibility of the dry felt according to the invention and an excellent conformability of the same to the surface of the drying cylinders as well as the necessary gentle treatment of the paper web.
  • the metal fibers can be contained in the dry felt according to the invention in any form and in any distribution depending on the nature and structure of the dry felt.
  • the metal fibers in an advantageous embodiment of the invention, are at least contained in the threads of the thread layer closest to or in contact with the paper web.
  • the metal fibers contained in the dry felt according to the invention or in its individual fabric threads can preferably be short, fine metal fibers, so-called metallic staple fibers, and / or long or endless metal fibers, i.e. be fine metal threads or metal wires.
  • the metal fibers of the dry felt according to the invention can also consist of any metal or any metal alloy. It is of course possible to use mixtures of metal fibers made of different metals or alloys. The use of metal fibers made of stainless steel or copper has proven particularly expedient.
  • the metal fibers of the thread layer closest to the paper web preferably consist of stainless steel.
  • the known dryer section of a paper machine shown in FIG. 1 consists of two superimposed, mutually parallel rows of circumferential, heated drying cylinders A which are offset from one another in a gap.
  • the paper web B arriving from the press section of the paper machine is shown alternately by broken lines the drying cylinder A is redirected and passes through the dryer section in the direction of the arrow C.
  • the full, uniform contact of the paper web B with the drying cylinders A is ensured by an endless drying felt D which runs in the direction of the arrow F and is guided over deflection rollers and which is in the area of the drying cylinder A covers the paper web B.
  • FIG. 1 The known dryer section of a paper machine shown in FIG. 1 consists of two superimposed, mutually parallel rows of circumferential, heated drying cylinders A which are offset from one another in a gap.
  • the paper web B arriving from the press section of the paper machine is shown alternately by broken lines the drying cylinder A is redirected and passes through the dryer section in the direction of the arrow
  • the dry felt D consists of a woven web (drying cloth) with warp threads 6 and weft threads 5.
  • two different, conventional types of binding are shown in the left and in the right half of the figure. However, the invention is not limited to these two types of binding.
  • the paper web B and the outer surface of a drying cylinder A are also shown schematically.
  • the warp threads 6 can consist of any material previously used for these threads, in particular natural, artificial and / or synthetic textile material.
  • metal fibers are contained in the weft threads 5.
  • These metal fibers can consist of any metal or alloy or of metal fiber mixtures of two or more metals and / or alloys.
  • the metal fibers are preferably made of stainless steel and / or copper.
  • the metal fibers, which are arranged in the weft threads 5 of the weft thread layer S closest to the paper web consist of stainless steel, while the metal fibers of the weft threads 5 of the other weft thread layers Si and Se can also consist of copper.
  • the metal fibers can be contained in the weft threads 5 in connection with any material previously used for these threads, in particular in connection with natural, artificial and / or synthetic textile fibers or the like.
  • 3 shows an exemplary embodiment of such a weft thread 5.
  • This weft thread can have short, fine metal fibers 7 which, together with short staple or cut fibers 8 made of natural and / or artificial or synthetic material, are spun or twisted into a thread.
  • the weft threads 5 from one or more, long or endless, ie continuous metal fibers, in particular consist of one or more fine metal threads or metal wires, which together with one or more, long or endless, i.e. continuous and optionally pre-spun, natural and / / or artificial or synthetic, in particular textile fibers or threads are spun or twisted.
  • This weft thread has a carrying core 9, which consists, for example, of a monofilament or multi-filament plastic thread or glass thread or the like and is provided with a wrapping made of metal fibers 7 is.
  • a carrying core 9 which consists, for example, of a monofilament or multi-filament plastic thread or glass thread or the like and is provided with a wrapping made of metal fibers 7 is.
  • short, fine metal fibers or long or endless, ie continuous metal fibers, in particular fine metal threads or metal wires can be used as wrapping around the core 9.
  • the winding of the core 9 can be done in any manner known from the so-called core yarns, for example by Braiding or twisting of the thread core 9 with the metal fibers 7 take place.
  • the winding of the thread core 9 consists of approximately parallel or helically twisted, long or endless metal fibers or metal threads 7 which, for example, consist of at least one outer, approximately helically wound connecting thread 10 natural and / or artificial or synthetic textile fibers are held together.
  • any thread, yarn and thread types that consist of metal fibers or metal threads or preferably metal fibers or metal threads in connection with any other spinnable or twistable, natural can be used as weft threads 5 in the dry felt D according to FIG. 2 or artificial materials, especially textile fibers
  • Different weft thread types with incorporated metal fibers and / or weft threads with different metal fiber content can also be used for the different weft thread layers S, Si, Se of the dry felt D according to FIG. 2.
  • the density of the weft threads 5 in the dry felt D according to FIG. 2 depends, among other things, on the heat gradient that arises in the dry felt D during operation of the dryer section and on the metal fiber content of the weft threads 5 and can be in the different weft thread layers S, Si , Se be the same or different.
  • the dry felt D described above has a high degree of vapor permeability, excellent flexibility and a sufficiently fine surface structure so that the best possible, gentle and uniform drying of the paper web B is achieved.
  • the dry felt D according to the invention is heated significantly more than the conventional dry felts, in particular to such an extent that the residual water evaporated from the paper web B does not condense in the dry felt D, but instead escapes through the steam as a vapor.
  • the heated dry felt D forms an additional heat source, which heats the paper web B from the outside, ie from the side opposite the drying cylinders A.
  • the drying speed of the paper web B is significantly increased and, as a result, the dwell time of the paper web B in the dryer section is correspondingly reduced.
  • the resistance of the dry felt to the usual chemical agents is improved by the metal fibers.
  • the steel fibers or the weft layer S reach a temperature closer to the surface temperature of the drying cylinders A and give it Absorbed heat in longer periods of time to the paper web B, in particular to the paper web side coming into contact with the weft layer S and away from the drying cylinders A which one is also vapor permeable.
  • the drying of the paper web is significantly favored, evened out and accelerated.

Abstract

1. Dryer-felt for the dryer section of paper machines, provided with threads containing metal fibres (7), which threads are contained, and more particularly are inserted by spinning or twisting into at least some of the weft threads (6) and/or the warp threads (5), together with natural and/or artificial or synthetic fibres, textile fibres (8), glass fibres (9), or the like, characterized in that the metal fibres (7) are contained only in the threads (5) belonging to the thread layer (S) which is the nearest to, or comes into contact with the paper web (B).

Description

Die Erfindung betrifft einen Trockenfilz für die Trocken= partie von Papiermaschinen.The invention relates to a dry felt for the dry = lot of paper machines.

Das Restwasser der die Nasspressen einer Papiermaschine verlassenden, feuchten Papierbahn wird bekanntlich in der anschliessenden Trockenpartie der Papiermaschine verdampfte In dieser Trockenpartie wird die Papierbahn um beheizte, umlaufende Trockenzylinder geführt. Mitlaufende, endlose Trockentücher sogenannte Trockenfilze sorgen dabei für ein gutes Anliegen der Papierbahn an den Trockenzylindern.The residual water of the moist paper web leaving the wet presses of a paper machine is known to be evaporated in the subsequent drying section of the paper machine. In this drying section, the paper web is guided around heated, rotating drying cylinders. Continuous, endless drying cloths, so-called drying felts, ensure that the paper web is in good contact with the drying cylinders.

Die bekannten Trockenfilze bestehen ausschliesslich aus natürlichen und/oder künstlichen bzw. synthetischen Textil= materialien und weisen eine entsprechend kleine Wärme= kapazität auf. Das aus der Papierbahn verdampfte Restwasser kondensiert deshalb zum Teil im Trockenfilz. In der Trocken= partie muss infolgedessen nicht nur die Papierbahn, sondern auch der Trockenfilz getrocknet werden. Dadurch wird die Verweilzeit der Papierbahn in der Trockenpartie der Papier= maschine d.h. die Trockenzeit der Papierbahn in unerwünschter Weise verlängert.The known dry felts consist exclusively of natural and / or artificial or synthetic textile materials and have a correspondingly small heat capacity. The residual water evaporated from the paper web therefore condenses in part in the dry felt. As a result, not only the paper web has to be in the dryer section, but also the dry felt can also be dried. As a result, the dwell time of the paper web in the drying section of the paper machine, ie the drying time of the paper web, is undesirably extended.

Aufgabe der Erfindung ist es, diese Nachteile der bekannten Ausführungen zu beseitigen und die Trockenzeit, d.h. die Laufzeit der Papierbahn durch die Trockenpartie einer Papier= maschine herabzusetzen.The object of the invention is to eliminate these disadvantages of the known designs and to reduce the drying time, i.e. to reduce the running time of the paper web through the dryer section of a paper machine.

Diese Aufgabe wird erfindungsgemäss mit einem Trockenfilz für die Trockenpartie von Papiermaschinen gelöst, der dadurch gekennzeichnet ist, dass er Metallfasern enthält. Dadurch wird die Wärmekapazität des Trockenfilzes bedeutend erhöht und der Trockenfilz wird zu einem Wärmespeicher, der die von den Trockenzylindern ausströmende Wärme aufnimmt und speichert und infolgedessen bedeutend stärker als bisher, insbesondere auch so stark erwärmt wird, dass das aus der feuchten Papierbahn verdampfte Restwasser nicht bzw. nur in vernachlässigbar kleinen Mengen im Trockenfilz selbst kondensieren kann. Darüber hinaus wirkt der erfin= dungsgemässe Trockenfilz seinerseits als zusätzliche Wärme= quelle, da er die von den Trockenzylindern aufgenommene und gespeicherte Wärme gleichmässig verteilt an die äussere, von den Trockenzylindern abgekehrte Seite der Papierbahn abgibt. Dadurch wird die Papierbahn nicht nur wie bisher von ihrer inneren, d.h. an den Trockenzylindern anliegen= den Seite, sondern gleichzeitig auch von ihrer äusseren, d.h. den Trockenzylindern entgegengesetzten, vom Trocken= filz abgedeckten Seite erwärmt und getrocknet. Im End= ergebnis wird gegenüber den herkömmlichen Trockenfilzen die Trockenleistung der Trockenpartie der Papiermaschine erhöht und die Verweilzeit der Papierbahn in der Trockenpartie wird entsprechend herabgesetzt. Ausser dieser schnelleren Trocknung der Papierbahn und der entsprechenden Erhöhung der Produktionsleistung bei der Papierherstellung wird wahrscheinlich auch die Papierqualität verbessert. Alle diese Vorteile werden ohne Erhöhung der Betriebskosten d.h. nur durch die einfache Anwendung des erfindungsgemässen Trockenfilzes erzielt.This object is achieved according to the invention with a dry felt for the dryer section of paper machines, which is characterized in that it contains metal fibers. This significantly increases the heat capacity of the dry felt and the dry felt becomes a heat store that absorbs and stores the heat emitted by the drying cylinders and, as a result, is heated to a much greater extent than before, in particular to such an extent that the residual water evaporated from the moist paper web does not or does not can only condense in negligibly small amounts in the dry felt itself. In addition, the dry felt according to the invention in turn acts as an additional heat source, since it emits the heat absorbed and stored by the drying cylinders evenly distributed to the outer side of the paper web facing away from the drying cylinders. As a result, the paper web is not only heated and dried from its inner side, that is to say against the drying cylinders = the side, but at the same time also from its outer side, that is to say opposite the drying cylinders, and covered by the dry = felt side. In the end = As a result, the drying performance of the dryer section of the paper machine is increased compared to conventional dryer felts and the dwell time of the paper web in the dryer section is reduced accordingly. In addition to this faster drying of the paper web and the corresponding increase in production output in paper production, the paper quality is also likely to be improved. All of these advantages are achieved without increasing the operating costs, ie only through the simple use of the dry felt according to the invention.

Die Metallfasern können in Verbindung mit allen bisher zur Herstellung solcher Trockentücher bzw. Trockenfilze be= nutzten Materialien, insbesondere in Verbindung mit natür= lichen und/oder künstlichen bzw. synthetischen Fasern, wie z.B. Textilfasern, Glasfasern od. dgl. benutzt werden. Diese Verbindung der Metallfasern mit nichtmetallischen Fasern gewährleistet eine hohe Flexibilität des erfindungs= gemässen Trockenfilzes und eine ausgezeichnete Anschmiegungs= fähigkeit desselben an die Oberfläche der Trockenzylinder sowie die erforderliche schonende Behandlung der Papierbahn.The metal fibers can be used in connection with all the materials previously used for the production of such dry cloths or dry felts, in particular in connection with natural and / or artificial or synthetic fibers, such as e.g. Textile fibers, glass fibers or the like can be used. This connection of the metal fibers with non-metallic fibers ensures a high flexibility of the dry felt according to the invention and an excellent conformability of the same to the surface of the drying cylinders as well as the necessary gentle treatment of the paper web.

Die Metallfasern können in dem erfindungsgemässen Trocken= filz in beliebiger Form und in beliebiger Verteilung je nach der Beschaffenheit und dem Aufbau des Trockenfilzes enthalten sein.The metal fibers can be contained in the dry felt according to the invention in any form and in any distribution depending on the nature and structure of the dry felt.

So z.B. können bei gewebten Trockenfilzen (Trockentüchern) die Metallfasern zumindest einige der Kett- und/oder Schussfäden bilden oder vorzugsweise in zumindest einigen der Kett- und/oder Schussfäden in Verbindung mit natürlichen und/oder synthetischen Textilfasern eingesponnen, oder ein= gezwirnt sein.For example, in the case of woven dry felts (drying cloths), the metal fibers can form at least some of the warp and / or weft threads, or preferably in at least some the warp and / or weft threads are spun in connection with natural and / or synthetic textile fibers, or a = twisted.

Bei ebenfalls an sich bekannten, gewebten Trockenfilzen (Trockentüchern) mit mehreren, übereinander liegenden Fadenlagen, sind die Metallfasern, in einer vorteilhaften Ausführungsform der Erfindung zumindest in den Fäden der der Papierbahn am nächsten liegenden bzwo mit dieser in Berührung kommenden Fadenlage enthalten.With also known per se, woven dry felts (drying cloths) with a plurality of thread layers lying one above the other, the metal fibers, in an advantageous embodiment of the invention, are at least contained in the threads of the thread layer closest to or in contact with the paper web.

Die im erfindungsgemässen Trockenfilz bzw. in dessen einzelnen Gewebefäden enthaltenen Metallfasern können vorzugsweise kurze, feine Metallfasern, sogenannte metalli= sehe Stapelfasern, und/oder lange bzw. endlose Metall= fasern d.h. feine Metallfäden oder Metalldrähte sein.The metal fibers contained in the dry felt according to the invention or in its individual fabric threads can preferably be short, fine metal fibers, so-called metallic staple fibers, and / or long or endless metal fibers, i.e. be fine metal threads or metal wires.

Die Metallfasern des erfindungsgemässen Trockenfilzes können auch aus einem beliebigen Metall bzw. einer belie= bigen Metallegierung bestehen. Es ist selbstverständlich möglich, auch Mischungen von Metallfasern aus verschiede= nen Metallen, bzw. Legierungen zu benutzen. Besonders zweckmässig hat sich die Verwendung von Metallfasern aus nichtrostendem Stahl oder aus Kupfer erwiesen. Bei dem oben erwähnten gewebten Trockenfilz (Trockentuch), bei dem die Metallfasern in den Fäden von mehreren, übereinander liegenden Fadenlagen enthalten sind, bestehen zumindest die Metallfasern der der Papierbahn am nächsten liegenden Fadenlage vorzugsweise aus nichtrostendem Stahl. Die vor= zugsweise auch in den Fäden der übrigen Fadenlagen enthaltenen Metallfasern können ebenfalls aus nichtrosten= dem Stahl oder aus beliebigem anderen Metall, insbesondere Kupfer bestehen.The metal fibers of the dry felt according to the invention can also consist of any metal or any metal alloy. It is of course possible to use mixtures of metal fibers made of different metals or alloys. The use of metal fibers made of stainless steel or copper has proven particularly expedient. In the case of the above-mentioned woven dry felt (drying cloth), in which the metal fibers are contained in the threads of a plurality of layers of threads lying one above the other, at least the metal fibers of the thread layer closest to the paper web preferably consist of stainless steel. The before = preferably also in the threads of the other thread layers contained metal fibers can also consist of non-rusting = the steel or any other metal, especially copper.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen und aus nachstehender Beschreibung einiger, in der Zeichnung dargestellter Ausführungsbei= spiele.

  • Fig. 1 zeigt in schematischer Darstellung die Trockenpartie einer Papiermaschine; Fig. 2 zeigt in schematischem Schnitt quer zu den Schussfäden und in vergrössertem Masstab einen gewebten Trockenfilz (Trockentuch) mit drei Schussfaden= lagen; Fig. 3 und 4 zeigen in schematischer schau= bildlicher Darstellung zwei mögliche Ausführungs= formen von metallfaserhaltigen Schussfäden.
Further features and advantages of the invention emerge from the subclaims and from the following description of some exemplary embodiments shown in the drawing.
  • Fig. 1 shows a schematic representation of the dryer section of a paper machine; Fig. 2 shows a schematic section across the weft threads and on an enlarged scale a woven dry felt (drying cloth) with three weft threads = layers; 3 and 4 show in a schematic visual representation two possible embodiments of weft threads containing metal fibers.

Die in Fig. 1 dargestellte, an sich bekannte Trockenpartie einer Papiermaschine besteht aus zwei übereinanderliegenden, zueinander parallelen Reihen von gegeneinander auf Lücke versetzten, umlaufenden, beheizten Trockenzylindern A. Die aus der Pressenpartie der Papiermaschine einlaufende, ge= strichelt dargestellte Papierbahn B wird wechselweise um die Trockenzylinder A umgeführt und durchläuft die Trockene partie in der Pfeilrichtung C. Das satte, gleichförmige Anliegen der Papierbahn B an den Trockenzylindern A wird von einem endlosen, in der Pfeilrichtung F mitlaufenden, über Umlenkrollen geführten Trockenfilz D gewährleistet, der im Bereich der Trockenzylinder A die Papierbahn B abdeckt. In dem in Fig. 2 dargestellten Ausführungsbeispiel besteht der Trockenfilz D aus einer gewebten Bahn (Trockentuch) mit Kettfäden 6 und Schussfäden 5. Die Schussfäden 5 sind in an sich bekannter Weise in drei aufeinander liegenden Lagen S, Si, Se angeordnet und ihre Bindung durch die Kettfäden 6, d.h. der Verlauf der Kettfäden-6 im Trocken= filz D kann beliebig gewählt werden. In Fig. 2 sind in der linken und in der rechten Figurenhäfte beispielsweise zwei verschiedene, herkömmliche Bindungsarten dargestellt. Die Erfindung ist jedoch nicht auf diesenbeiden Bindungsarten beschränkt. In Fig. 2 sind schematisch auch die Papierbahn B und die Mantelfläche eines Trockenzylinders A einge= zeichnet.The known dryer section of a paper machine shown in FIG. 1 consists of two superimposed, mutually parallel rows of circumferential, heated drying cylinders A which are offset from one another in a gap. The paper web B arriving from the press section of the paper machine is shown alternately by broken lines the drying cylinder A is redirected and passes through the dryer section in the direction of the arrow C. The full, uniform contact of the paper web B with the drying cylinders A is ensured by an endless drying felt D which runs in the direction of the arrow F and is guided over deflection rollers and which is in the area of the drying cylinder A covers the paper web B. In the exemplary embodiment shown in FIG. 2, the dry felt D consists of a woven web (drying cloth) with warp threads 6 and weft threads 5. The weft threads 5 are arranged in a manner known per se in three layers S, Si, Se lying one on top of the other and are bonded by the warp threads 6, ie the course of the warp threads 6 in the dry = felt D, can be chosen as desired. In Fig. 2, two different, conventional types of binding are shown in the left and in the right half of the figure. However, the invention is not limited to these two types of binding. In Fig. 2 the paper web B and the outer surface of a drying cylinder A are also shown schematically.

Die Kettfäden 6 können aus beliebigem, bisher für diese Fäden benutztem Material, insbesondere aus natürlichem, künstlichem und/oder synthetischem Textilmaterial bestehen.The warp threads 6 can consist of any material previously used for these threads, in particular natural, artificial and / or synthetic textile material.

In den Schussfäden 5 sind dagegen erfindungsgemäss Metall= fasern enthalten. Diese Metallfasern können dabei aus einem beliebigen Metall bzw. einer beliebigen Legierung oder aus Metallfasermischungen von zwei oder mehreren beliebigen Metallen und/oder Legierungen bestehen. Vorzugsweise be= stehen die Metallfasern aus nichtrostendem Stahl und/oder aus Kupfer. In einer vorteilhaften Ausführungsform bestehen die Metallfasern, die in den Schussfäden 5 der der Papier= bahn am nächsten liegenden Schussfadenlage S angeordnet sind, aus nichtrostendem Stahl, während die Metallfasern der Schussfäden 5 der übrigen Schussfadenlagen Si und Se auch aus Kupfer bestehen können.In contrast, according to the invention, metal fibers are contained in the weft threads 5. These metal fibers can consist of any metal or alloy or of metal fiber mixtures of two or more metals and / or alloys. The metal fibers are preferably made of stainless steel and / or copper. In an advantageous embodiment, the metal fibers, which are arranged in the weft threads 5 of the weft thread layer S closest to the paper web, consist of stainless steel, while the metal fibers of the weft threads 5 of the other weft thread layers Si and Se can also consist of copper.

Die Metallfasern können in den Schussfäden 5 in Verbindung mit beliebigem, bisher für diese Fäden benutztem Material, insbesondere in Verbindung mit natürlichen, künstlichen und/oder synthetischen Textilfasern od. dgl. enthalten sein. In Fig. 3 ist ein Ausführungsbeispiel eines solchen Schussfadens 5 dargestellt. Dieser Schussfaden kann kurze, - feine Metallfasern 7 aufweisen, die zusammen mit kurzen Stapel- bzw. Schnittfasern 8 aus natürlichem und/oder künstlichem bzw. synthetischem Material zu einem Faden versponnen bzw. verzwirnt sindo In einer abgewandelten Aus= führungsform nach Fig. 3 können die Schussfäden 5 aus einem oder mehreren, langen bzw. endlosen, d.h. kontinuierlichen Metallfasern, insebsondere aus einem oder mehreren, feinen Metallfäden bzw. Metalldrähten bestehen, die zusammen mit einem oder mehreren, langen bzw. endlosen, d.h. kontinuier= lichen und gegebenenfalls vorgesponnenen, natürlichen und/ /oder künstlichen bzw. synthetischen, insbesondere textilen Fasern oder Fäden versponnen oder verzwirnt sind.The metal fibers can be contained in the weft threads 5 in connection with any material previously used for these threads, in particular in connection with natural, artificial and / or synthetic textile fibers or the like. 3 shows an exemplary embodiment of such a weft thread 5. This weft thread can have short, fine metal fibers 7 which, together with short staple or cut fibers 8 made of natural and / or artificial or synthetic material, are spun or twisted into a thread. In a modified embodiment according to FIG. 3 the weft threads 5 from one or more, long or endless, ie continuous metal fibers, in particular consist of one or more fine metal threads or metal wires, which together with one or more, long or endless, i.e. continuous and optionally pre-spun, natural and / / or artificial or synthetic, in particular textile fibers or threads are spun or twisted.

In Fig. 4 ist ein anderes Ausführungsbeispiel eines Schuss= fadens 5 dargestellt Dieser Schussfaden weist einen tra= genden Kern 9 auf, der z.B. aus einem monofilen oder multi= filen Kunststoffgarn oder Glasfaden od. dgl. besteht und mit einer Umwicklung aus Metallfasern 7 versehen ist. Auch in diesem Fall können als Umwicklung des Kerns 9 kurze, feine Metallfasern oder lange bzw. endlose, d.h. konti= nuierliche Metallfasern, insbesondere feine Metallfäden oder Metalldrähte benutzt werden. Je nach der Art der Metallfasern kann die Umwicklung des Kerns 9 in beliebiger, von den sogenannten Kerngarnen bekannter Weise, z.B. durch Umspinnung bzw. Umzwirnung des Fadenkerns 9 mit den Metall= fasern 7 erfolgen. In dem in Fig. 4 dargestellten Ausfüh= rungsbeispiel besteht die Umwicklung des Fadenkerns 9 aus etwa parallelen oder wendelförmig verdrehten, langen bzw. endlosen Metallfasern bzw. Metallfäden 7, die durch minde= stens einen äusseren, etwa schraubenförmig gewundenen Ver= bindungsfaden 10 z.B. aus natürlichen und/oder künstlichen bzw. synthetischen Textilfasern zusammengehalten werden.4 shows another exemplary embodiment of a weft thread 5. This weft thread has a carrying core 9, which consists, for example, of a monofilament or multi-filament plastic thread or glass thread or the like and is provided with a wrapping made of metal fibers 7 is. In this case too, short, fine metal fibers or long or endless, ie continuous metal fibers, in particular fine metal threads or metal wires, can be used as wrapping around the core 9. Depending on the type of metal fibers, the winding of the core 9 can be done in any manner known from the so-called core yarns, for example by Braiding or twisting of the thread core 9 with the metal fibers 7 take place. In the exemplary embodiment shown in FIG. 4, the winding of the thread core 9 consists of approximately parallel or helically twisted, long or endless metal fibers or metal threads 7 which, for example, consist of at least one outer, approximately helically wound connecting thread 10 natural and / or artificial or synthetic textile fibers are held together.

Grundsätzlich können als Schussfäden 5 in dem Trockenfilz D nach Fig. 2 alle beliebigen Faden-, Garn- und Zwirnarten eingesetzt werden, die aus Metallfasern bzw. Metallfäden bestehen oder vorzugsweise Metallfasern bzw. Metallfäden in Verbindung mit beliebigen anderen verspinnbaren oder ver= zwirnbaren, natürlichen oder künstlichen Materialien, insbesondere Textilfasern enthalteneIn principle, any thread, yarn and thread types that consist of metal fibers or metal threads or preferably metal fibers or metal threads in connection with any other spinnable or twistable, natural can be used as weft threads 5 in the dry felt D according to FIG. 2 or artificial materials, especially textile fibers

Für die verschiedenen Schussfadenlagen S, Si, Se des Trockenfilzes D nach Fig. 2 können auch unterschiedliche Schussfadenarten mit eingearbeiteten Metallfasern und/oder Schussfäden mit unterschiedlich hohem Metallfasergehalt benutzt werden. Die Dichte der Schussfäden 5 in dem Trocken= filz D nach Fig. 2 hängt unter anderem vom Wärmegefälle, das sich im Trockenfilz D im Betrieb der Trockenpartie ein= stellt, sowie vom Metallfasergehalt der Schussfäden 5 ab und kann in den verschiedenen Schussfadenlagen S, Si, Se gleich oder unterschiedlich sein.Different weft thread types with incorporated metal fibers and / or weft threads with different metal fiber content can also be used for the different weft thread layers S, Si, Se of the dry felt D according to FIG. 2. The density of the weft threads 5 in the dry felt D according to FIG. 2 depends, among other things, on the heat gradient that arises in the dry felt D during operation of the dryer section and on the metal fiber content of the weft threads 5 and can be in the different weft thread layers S, Si , Se be the same or different.

Der vorstehend beschriebene Trockenfilz D weist einen hohen Dampfdurchlässigkeitsgrad, eine ausgezeichnete Flexibilität und eine ausreichend feine Oberflächenstruktur auf, so dass eine bestmögliche, schonende und gleichmässige Trocknung der Papierbahn B erzielt wird. Gleichzeitig wirkt der Trockenfilz D wegen der eingewebten Metallfasern als Wärmespeicher, der die von den Trockenzylindern A ausgehen= de Wärme aufnimmt und speichert. Der erfindungsgemässe Trockenfilz D wird infolgedessen bedeutend stärker als die herkömmlichen Trockenfilze, insbesondere so stark erhitzt, dass das aus der Papierbahn B verdampfte Restwasser nicht in dem Trockenfilz D kondensiert, sondern durch diesen als Dampf nach aussen entweicht. Gleichzeitig bildet der erhitzte Trockenfilz D eine zusätzliche Wärmequelle, die die Papierbahn B von aussen, d.h. von der den Trocken= zylindern A entgegengesetzten Seite erwärmt. Im Endergebnis wird die Trockengeschwindigkeit der Papierbahn B wesentlich erhöht und infolgedessen die Verweilzeit der Papierbahn B in der Trockenpartie entsprechend herabgesetzt. Zusätzlich wird durch die Metallfasern die Widerstandsfähigkeit des Trockenfilzes gegen die üblichen chemischen Wirkstoffe verbessert.The dry felt D described above has a high degree of vapor permeability, excellent flexibility and a sufficiently fine surface structure so that the best possible, gentle and uniform drying of the paper web B is achieved. At the same time, because of the woven-in metal fibers, the dry felt D acts as a heat store, which absorbs and stores the heat coming from the drying cylinders A = de. As a result, the dry felt D according to the invention is heated significantly more than the conventional dry felts, in particular to such an extent that the residual water evaporated from the paper web B does not condense in the dry felt D, but instead escapes through the steam as a vapor. At the same time, the heated dry felt D forms an additional heat source, which heats the paper web B from the outside, ie from the side opposite the drying cylinders A. As a result, the drying speed of the paper web B is significantly increased and, as a result, the dwell time of the paper web B in the dryer section is correspondingly reduced. In addition, the resistance of the dry felt to the usual chemical agents is improved by the metal fibers.

Bei der vorstehend beschriebenen Ausführungsform, bei der zumindest die Metallfasern in der der Papierbahn B am nächsten liegenden Schussfadenlage S aus nichtrostendem Stahl bestehen, wird der Vorteil erzielt, dass die Wärme= leitfähigkeit der Stahlfasern bedeutend geringer als diejenige der anderen Metallfasern, insbesondere der Kupfer= fasern ist. Infolgedessen erreichen die Stahlfasern bzw. die Schussfadenlage S eine der Oberflächentemperatur der Trockenzylindern A näher liegende Temperatur und geben die aufgenommene Wärme in längeren Zeiträumen an die Papierbahn B, insbesondere an die mit der Schussfadenlage S in Berüh= rung kommende, von den Trockenzylindern A abgekehrte Papier= bahnseite abo Dadurch wird die zu trocknende Papierbahn B gewissermassen zwischen zwei annähernd gleich stark beheizten Flächen eingeschlossen, von denen eine zusätzlich auch dampfdurchlässig ist. Dadurch wird die Trocknung der Papier= bahn wesentlich begünstigt, vergleichmässigt und beschleunigt. Versuche mit erfindungsgemässen Trockenfilzen nach Fig. 2 haben z.B. ergeben, dass bei einer Oberflächentemperatur der Trockenzylinder A von etwa 125- 130 °C, die Temperatur des erfindungsgemässen Trockenfilzes problemlos Werte von 105 -- 110 °C erreichte,gegenüber einer Höchsttemperatur von etwa 90 °C der herkömmlichen Trockenfilze.In the embodiment described above, in which at least the metal fibers in the weft layer S closest to the paper web B consist of stainless steel, the advantage is achieved that the heat = conductivity of the steel fibers is significantly lower than that of the other metal fibers, in particular the copper = is fibers. As a result, the steel fibers or the weft layer S reach a temperature closer to the surface temperature of the drying cylinders A and give it Absorbed heat in longer periods of time to the paper web B, in particular to the paper web side coming into contact with the weft layer S and away from the drying cylinders A which one is also vapor permeable. As a result, the drying of the paper web is significantly favored, evened out and accelerated. Experiments with dry felts according to the invention according to FIG. 2 have shown, for example, that with a surface temperature of the drying cylinder A of approximately 125-130 ° C., the temperature of the dry felt according to the invention easily reached values of 105-110 ° C., compared to a maximum temperature of approximately 90 ° C of conventional dry felts.

Die Erfindung ist selbstverständlich nicht auf die darge= stellten und beschriebenen Ausführungsbeispiele beschränkt, sondern kann sinngemäss auch bei allen bisher bekannten Trockenfilzarten mit der selben, oben dargelegten Wirkung und den entsprechenden Vorteilen angewandt werden.The invention is of course not limited to the exemplary embodiments illustrated and described, but can also be applied analogously to all previously known types of dry felt with the same effect set out above and the corresponding advantages.

Claims (10)

1. Trockenfilz für die Trockenpartie von Papiermaschinen, dadurch gekennzeichnet, dass er Metallfasern (7) enthält.1. Dry felt for the dryer section of paper machines, characterized in that it contains metal fibers (7). 2. Trockenfilz nach Anspruch 1, dadurch gekennzeichnet, dass die Metallfasern (7) im Trockenfilz (D) in Verbindung mit natürlichen und/oder künstlichen bzw. synthetischen Fasern, insbesondere Textilfasern (8), Glasfasern (9), od. dglo vorliegen.2. dryer according to claim 1, characterized in that the metal fibers (7) in the dryer (D) in combination with natural and / or artificial or synthetic fibers, in particular textile fibers (8), glass fibers (9) od. Exist like o . 3. Trockenfilz in gewebter Ausführung mit Kettfäden und Schussfäden nach Anspruch 1 und 2, dadurch gekennzeichnet, dass die Metallfasern zumindest einige der Kettfäden (6) und/oder der Schussfäden (5) bilden.3. Dry felt in a woven design with warp threads and weft threads according to claim 1 and 2, characterized in that the metal fibers form at least some of the warp threads (6) and / or the weft threads (5). 4. Trockenfilz in gewebter Ausführung mit Kettfäden und Schussfäden nach Anspruch 1 und 2, dadurch gekennzeichnet, dass die Metallfasern (7) in zumindest einigen der Kett= fäden (6) und/oder der Schussfäden (5) in Verbindung mit natürlichen und/oder künstlichen bzw. synthetischen Fasern, insbesondere Textilfasern (8), Glasfasern (9) od. dgl. enthalten, insbesondere eingesponnen oder eingezwirnt sind.4. Dry felt in a woven design with warp threads and weft threads according to claim 1 and 2, characterized in that the metal fibers (7) in at least some of the warp threads (6) and / or the weft threads (5) in connection with natural and / or artificial or synthetic fibers, in particular textile fibers (8), glass fibers (9) or the like. Contained, in particular are spun or twisted. 5. Trockenfilz mit mehreren, übereinander liegenden Fadenlagen nach Anspruch 4, dadurch gekennzeichnet, dass die Metallfasern (7) zumindest nur in den Fäden (5) der der Papierbahn (B) am nächsten liegenden bzw. mit dieser in Berührung kommenden Fadenlage (S) enthalten, insbe= sondere eingesponnen oder eingezwirnt sind.5. Dry felt with several superimposed thread layers according to claim 4, characterized in that the metal fibers (7) at least only in the threads (5) of the paper web (B) closest to or come into contact with the thread layer (S). included, in particular = woven or twisted. 6. Trockenfilz nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass zumindest ein Teil der Metallfasern aus nichtrostendem Stahl besteht.6. Dry felt according to one of claims 1 to 5, characterized in that at least part of the metal fibers consists of stainless steel. 7. Trockenfilz nach Anspruch 5 und 6, dadurch gekennzeich= net, dass die Metallfasern in den Fäden (5) mindestens einer Fadenlage (S, Si, Se), insbesondere der der Papier= bahn (B) am nächsten liegenden Fadenlage (S) aus nicht= rostendem Stahl bestehen.7. Dry felt according to claim 5 and 6, characterized in that the metal fibers in the threads (5) at least one thread layer (S, Si, Se), in particular the thread layer (S) closest to the paper web (B) made of stainless steel. 8. Trockenfilz nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Metallfasern aus kurzen, feinen Metallfasern bestehen.8. Dry felt according to one of claims 1 to 7, characterized in that the metal fibers consist of short, fine metal fibers. 9. Trockenfilz nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Metallfasern aus langen, endlosen bzw. kontinuierlichen Metallfasern, insbesondere feinen Metallfäden oder Metalldrähten bestehen.9. Dry felt according to one of claims 1 to 7, characterized in that the metal fibers consist of long, endless or continuous metal fibers, in particular fine metal threads or metal wires. 10. Trockenfilz nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass er metallfaserhaltige Garne oder Zwirne, insbesondere Kerngarne mit metallfaserhaltiger Umwicklung enthält.10. Dry felt according to one of claims 1 to 9, characterized in that it contains metal fiber-containing yarns or threads, in particular core yarns with metal fiber-containing wrapping.
EP81109962A 1980-12-15 1981-11-27 Dryer-felt for the dryer section of paper machines Expired EP0054206B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81109962T ATE13322T1 (en) 1980-12-15 1981-11-27 DRYER FELT FOR THE DRYER SECTION OF PAPER MACHINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6198080U 1980-12-15
IT8061980U IT8061980V0 (en) 1980-12-15 1980-12-15 WEAVED CANVAS, BELT-LEAF, FOR CONTINUOUS BELT PAPER DRYING CIRCUITS.

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EP0054206A1 true EP0054206A1 (en) 1982-06-23
EP0054206B1 EP0054206B1 (en) 1985-05-15

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EP (1) EP0054206B1 (en)
AT (1) ATE13322T1 (en)
DE (1) DE3170548D1 (en)
IT (1) IT8061980V0 (en)

Cited By (5)

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Publication number Priority date Publication date Assignee Title
EP0290653A1 (en) * 1987-05-14 1988-11-17 Thomas Josef Heimbach GmbH & Co. Material web
US4874469A (en) * 1986-08-12 1989-10-17 Beloit Corporation Heated extended nip press with porous roll layers
US5082533A (en) * 1990-04-10 1992-01-21 Beloit Corporation Heated extended nip press with porous roll layers
WO1997014845A1 (en) * 1995-10-17 1997-04-24 Scapa Group Plc Papermakers dryer fabric
US6346171B1 (en) * 1996-12-30 2002-02-12 Voith Sulzer Papiermaschinen Gmbh Paper making machine using separate metal screens for press and dryer cylinders

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR560947A (en) * 1923-01-12 1923-10-12 Debouchaud & Cie New kind of so-called woven felts: stationery
CH238316A (en) * 1943-07-10 1945-07-15 Fink Armin Reinforced fabric and process for its manufacture.
FR1061571A (en) * 1951-08-25 1954-04-13 Johnson & Sons Ltd C H Compound yarn and wire mesh produced using this yarn and usable in particular in paper machines
FR1161568A (en) * 1956-10-22 1958-09-02 Cie Hudson France Catalytic sieve improvements
GB1085098A (en) * 1964-06-23 1967-09-27 Bba Group Ltd Improvements in or relating to yarn and fabric made therefrom
FR1559381A (en) * 1967-04-05 1969-03-07
FR2438114A3 (en) * 1978-10-06 1980-04-30 Applic Gaz Sa TEXTILE ELEMENT AND WOVEN MATERIAL IN PARTICULAR FOR USE AS A SUBSTRATE FOR A CATALYTIC MATERIAL, FOR EXAMPLE OF COMBUSTION

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR560947A (en) * 1923-01-12 1923-10-12 Debouchaud & Cie New kind of so-called woven felts: stationery
CH238316A (en) * 1943-07-10 1945-07-15 Fink Armin Reinforced fabric and process for its manufacture.
FR1061571A (en) * 1951-08-25 1954-04-13 Johnson & Sons Ltd C H Compound yarn and wire mesh produced using this yarn and usable in particular in paper machines
FR1161568A (en) * 1956-10-22 1958-09-02 Cie Hudson France Catalytic sieve improvements
GB1085098A (en) * 1964-06-23 1967-09-27 Bba Group Ltd Improvements in or relating to yarn and fabric made therefrom
FR1559381A (en) * 1967-04-05 1969-03-07
FR2438114A3 (en) * 1978-10-06 1980-04-30 Applic Gaz Sa TEXTILE ELEMENT AND WOVEN MATERIAL IN PARTICULAR FOR USE AS A SUBSTRATE FOR A CATALYTIC MATERIAL, FOR EXAMPLE OF COMBUSTION

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4874469A (en) * 1986-08-12 1989-10-17 Beloit Corporation Heated extended nip press with porous roll layers
EP0290653A1 (en) * 1987-05-14 1988-11-17 Thomas Josef Heimbach GmbH & Co. Material web
US5082533A (en) * 1990-04-10 1992-01-21 Beloit Corporation Heated extended nip press with porous roll layers
WO1997014845A1 (en) * 1995-10-17 1997-04-24 Scapa Group Plc Papermakers dryer fabric
US6346171B1 (en) * 1996-12-30 2002-02-12 Voith Sulzer Papiermaschinen Gmbh Paper making machine using separate metal screens for press and dryer cylinders
US6497792B2 (en) 1996-12-30 2002-12-24 Voith Sulzer Papiermaschinen Gmbh Paper machine using metal screen for press section and dryer cylinders

Also Published As

Publication number Publication date
ATE13322T1 (en) 1985-06-15
EP0054206B1 (en) 1985-05-15
IT8061980V0 (en) 1980-12-15
DE3170548D1 (en) 1985-06-20

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