EP0094638A2 - Link belt and method of making the same - Google Patents

Link belt and method of making the same Download PDF

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Publication number
EP0094638A2
EP0094638A2 EP83104732A EP83104732A EP0094638A2 EP 0094638 A2 EP0094638 A2 EP 0094638A2 EP 83104732 A EP83104732 A EP 83104732A EP 83104732 A EP83104732 A EP 83104732A EP 0094638 A2 EP0094638 A2 EP 0094638A2
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EP
European Patent Office
Prior art keywords
spirals
spiral
polyester
consist
polyamide
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.)
Ceased
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EP83104732A
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German (de)
French (fr)
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EP0094638A3 (en
Inventor
Georg Dipl.-Ing. Borel
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Herman Wangner GmbH and Co KG
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Herman Wangner GmbH and Co KG
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Application filed by Herman Wangner GmbH and Co KG filed Critical Herman Wangner GmbH and Co KG
Publication of EP0094638A2 publication Critical patent/EP0094638A2/en
Publication of EP0094638A3 publication Critical patent/EP0094638A3/en
Ceased legal-status Critical Current

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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
    • D21F1/0072—Link belts

Definitions

  • the invention relates to a spiral band made of a plurality of spirals, the turns of which are joined together in a zipper-like manner and are secured by plug-in wires.
  • spiral tapes are known from DE-AS 24 19 751, DE-OS 29 38 221 and EU-AO 018 200.
  • the spirals - these are coils - are usually made of polyester-plastic monofilaments.
  • the spiral belts serve as transport and filter belts and have recently also been used in particular conventional dry felts in the dryer section of paper machines.
  • the application in papermaking has so far been limited to the dryer section because the requirements for marking properties, mechanical abrasion and resistance to compression are the least in this part of the paper machine.
  • the sheet formation of the paper web has already been completed in the dryer section and the paper web has been compressed to such an extent that it is no longer susceptible to marking.
  • the fineness of the spiral belt can be selected according to the type of paper and the construction of the dryer section. Air permeability is controlled by filling the cavities of the spirals with voluminous yarns.
  • the aim is to use particularly fine spiral screens in the sheet forming part of a paper machine.
  • the main advantage of the spiral tapes is that there is no seam and the spiral tapes can be delivered open and can only be made endless in the paper machine by inserting the last plug-in wire.
  • the spiral belts are particularly advantageous if there is not a conventional press with a practically linear press zone, but a press with an extended press nip zone, which is referred to as an "extended nip press".
  • the spiral belts are particularly advantageous here because of the free volume inside the spirals when they are used between the press roller and the dewatering felt.
  • An open "fabric press” made of spirals can often make the expensive grooved roller superfluous.
  • the invention has for its object to improve the abrasion resistance of a spiral tape without resorting to complex, multi-layer spiral systems.
  • spirals are made partly of polyamide or of another abrasion-resistant plastic material partly made of polyester and the plug wires are made of polyester.
  • spirals can consist of these two materials alternately or in any other order.
  • a further increase in the running time results from the fact that the spirals made of polyamide are made of thicker material than the spirals made of polyester.
  • the volume of abrasion can be increased further by the highest points of the spirals lying on one level on the paper side, while the polyamide spirals protrude accordingly on the running side.
  • the invention furthermore relates to the production of a spiral belt in the last-mentioned embodiment, in that the spiral belt is guided over a heated fixing roller or a heated, curved support table during heat setting under high longitudinal tension.
  • inventive spiral belt as S tützband in the press section of a paper machine it is of importance that the inventive spiral belt and has an improved pressure resistance because of largely pressure-resistant polyamide spirals both the required abrasion resistance.
  • the D jerk resistance of the spiral belt can be further increased by additional filler wires.
  • This F ülldrähte composed of monofilament polyester, polyamide or other plastic material.
  • the diameter of the ülldrähte F is equal to or greater than the diameter of the plug wires.
  • spiral tape is used in a so-called "extended nip press", it is provided on at least one side with a polyurethane layer, which has a smoothly ground surface, so that the pressure fluid is sealed off in the pressure area.
  • the open hinge side facing the paper web offers sufficient volume to absorb the squeezed water and to transport it out of the press zone.
  • the spiral tapes have been made exclusively from polyester monofilaments for reasons of stability.
  • polyamide is more resistant to abrasion than polyester
  • no spiral tapes made of polyamide have been used so far, because such spiral tapes cannot be expected to have sufficient longitudinal stability, ie they stretch too much.
  • a high elongation is to be expected in particular in the paper machine.
  • the width of the spiral belt would also change considerably. Depending on the water absorption, the change in width can be along the spiral band be different. Because of the high longitudinal tension exerted piralband in a paper machine to such S, such a fluctuation in width of the spiral belt in the formation of waves in the S would lead piralband which easily cause longitudinal folds and to make the spiral belt unusable.
  • the polyester spirals and the plug wires which are also made of polyester, have a stabilizing effect on the width of the spiral tape and give it sufficient transverse stability.
  • the offset of the plug-in wires also contributes to the transverse stability, which is formed during the heat-setting of the spiral belt as a result of the effect of the elevated temperature and the tension exerted on the sieve belt by the fact that the head bends of the spirals penetrate somewhat into the material of the plug-in wires, so that these become roughly wavy.
  • the finished spiral band there is a partly form-fitting and partly force-engaging engagement between the plug wires and the spirals.
  • adjacent spirals overlap each other to such an extent that they jointly delimit a transverse channel through which plug-in wires 3 are inserted, which secure the spirals.
  • the distances between the plug wires 3 are generally the same. In individual cases, however, the distances can also be different. Be used for the polyamide spirals 2 M onofile of greater diameter than polyester spirals for 1 so can marking problems arise because the distance between the individual windings then in the polyamide spirals 2 is smaller than that of the polyester spirals 1 This can be compensated in part by the fact that the polyester spirals 1 are shorter in the longitudinal direction of the spiral band and the distance between the corresponding plug wires 3 within a polyester spiral 1 is smaller than within a polyamide spiral 2.
  • the open area between two successive ones Windings of a polyester spiral 1 can thus be selected to be the same size as the open area between two successive windings of a polyamide spiral 2.
  • the diameter of the polyamide monofilament can be up to 30% larger than that of the polyester monofilament.
  • the larger material cross section of the polyamide spirals 2 increases the material volume available for abrasion and at the same time reduces the bottom differed in the elongation at break and the elongation in the longitudinal direction of the spiral band between the polyester spirals 1 and the polyamide spirals 2.
  • the greater material thickness of the polyamide spirals 2 largely removes the polyester spirals 1 from abrasion. This effect can be enhanced by the fact that the uppermost points of both types of spirals on the paper side lie in one plane and that the polyamide spirals 2 protrude further on the running side. If the top of the spirals lies on one level on the paper side, the spiral band is referred to as "monoplan". In this case, the polyamide spirals on the barrel side protrude by twice the diameter difference. 2 shows the protrusion of the polyamide spirals 2, the dimension a being smaller than the dimension b. The difference in the wire diameter is shown exaggeratedly large in FIGS. 1 and 2 for clarification.
  • the one-sided smoothing (monoplanarity) of the spiral belt can be achieved by heat-fixing it with the side that will later serve as the paper side, with a high longitudinal tension over a heated fixing roller 4 (FIG. 3) or a heated, curved support table.
  • FIG. 4 shows the spirals with a symmetrical arrangement before fixing in enlarged form
  • FIG. 5 shows the mutual displacement of the spirals after fixing.
  • a complete monoplanarity of the spiral band cannot be achieved when fixing alone. If necessary, the paper side must be smoothed further by sanding.
  • the X-direction is the running or longitudinal direction of the spiral belt, see F ig. 6.
  • the plug wires are hardly deformed in conventional spiral bands, because the forces acting during fixing lie exclusively in the X - Y plane, ie act in the X direction (Fig. 7) .
  • the spiral tape can be provided with a dirt-repellent coating.
  • the spiral belt is chemically cleaned to remove grease residues from the material surface.
  • the dirt-repellent substance for example, fluorocarbon resin, either alone or together with other applied chemicals and condensed at 16 0 ° C. Spiral tapes provided with such a dirt-repellent coating do not have to be cleaned as often, as a result of which the downtimes and the Be reduced R agreement cost.
  • the cored wires 5 run in the cavities of the spirals and their diameter is equal to or larger than that of the plug wires 3.
  • a spiral tape with spirals which alternately consist of polyamide and polyester in a ratio of 1: 1 and with polyester plug wires, is assembled in the usual way.
  • the polyester spirals consist of a longitudinally stable, i.e. low-stretch, polyester monofilament and have a diameter of 0.7 mm, the distance between the plug wires is even and is 5 mm.
  • the dimension of the spirals perpendicular to the plane of the spiral band is 2.5 mm, so the spirals have an oval cross-section.
  • the polyamide spirals consist of a monofilament with a diameter of 0.8 mm and are therefore approx. 15% thicker than the polyester monofilament. While the dimension of the polyamide spirals in the longitudinal direction is 5 mm and is therefore equal to the corresponding dimension of the polyester spirals, the dimension perpendicular to the plane of the spiral band is 2.65 mm.
  • the polyamide spirals are on the paper side (top) of the spiral tape 0.04 mm higher than the polyester spirals. On the running side (bottom), the polyamide spirals protrude approximately 0.11 mm beyond the polyester spirals.
  • the division of the spirals in the transverse direction of the spiral album that is about 6 turns / cm.
  • the plug wires consist of a polyester monofilament type that is easily deformable under pressure and heat and have a diameter of 0.9 mm.
  • the finished spiral belt weighs about 139 0 g / m2.
  • the spiral band is of the type known from DE-OS 29 38 221, i.e. the spirals have no tension, the spirals are made in such a way that the plastic monofilament has no torsion and the sieve belt is heat-set so that the spirals penetrate the material of the plug wires somewhat and give them a wave shape.

Abstract

The link belt consists of a plurality of links (1, 2) whose coils have been joined together in zipper fashion and secured with wires (3) inserted into the channel formed by the overlapping coil arcs. Some of the links (1, 2) consist of polyester, while the others consist of another abrasion-resistant plastics material, preferably polyamide, and the wires (3) consist of polyester. The links (2) which consist of polyamide can have a larger diameter than the links (1) which consist of polyester. The link belt has a long life. On one side of the link belt the uppermost points of all the links can lie substantially in a plane, while on the other side of the link belt the links (2) which consist of polyamide project beyond the links (1) which consist of polyester. In the course of its manufacture, the link belt is heat-set by pulling it with a high longitudinal tension over a heated setting roll or a curved support table. <IMAGE>

Description

Die Erfindung betrifft ein Spiralband aus einer Vielzahl von Spiralen, deren Windungen reissverschlussartig ineinander gefügt sind und durch Steckdrähte gesichert sind.The invention relates to a spiral band made of a plurality of spirals, the turns of which are joined together in a zipper-like manner and are secured by plug-in wires.

Derartige Spiralbänder sind aus der DE-AS 24 19 751, der DE-OS 29 38 221 und der EU-A-O 018 200 bekannt. Die Spiralen - an sich handelt es sich hierbei um Wendeln - bestehen in der Regel aus Polyester-Kunststoffmonofilen. Die Spiralbänder dienen als Transport- und Filterbänder und haben in jüngster Zeit insbesondere auch die herkömmlichen Trockenfilze in der Trockenpartie von Papiermaschinen ersetzt. Die Anwendung bei der Papierherstellung ist bisher auf die Trockenpartie beschränkt gewesen, weil in diesem Teil der Papiermaschine die Anforderungen an die Markierungseigenschaften, den mechanischen Abrieb und den Widerstand gegen Kompression am geringsten - sind. Die Blattbildung der Papierbahn ist in der Trockenpartie bereits abgeschlossen und die Papierbahn soweit verdichtet, dass sie nicht mehr markierungsanfällig ist. Die Feinheit des Spiralbandes kann dabei entsprechend der Papierart und der Konstruktion der Trockenpartie gewählt werden. Die Luftdurchlässigkeit wird durch das Ausfüllen der Hohlräume der Spiralen durch voluminöse Garne gesteuert.Such spiral tapes are known from DE-AS 24 19 751, DE-OS 29 38 221 and EU-AO 018 200. The spirals - these are coils - are usually made of polyester-plastic monofilaments. The spiral belts serve as transport and filter belts and have recently also been used in particular conventional dry felts in the dryer section of paper machines. The application in papermaking has so far been limited to the dryer section because the requirements for marking properties, mechanical abrasion and resistance to compression are the least in this part of the paper machine. The sheet formation of the paper web has already been completed in the dryer section and the paper web has been compressed to such an extent that it is no longer susceptible to marking. The fineness of the spiral belt can be selected according to the type of paper and the construction of the dryer section. Air permeability is controlled by filling the cavities of the spirals with voluminous yarns.

Gleichzeitig wird angestrebt, besonders feine Spiralsiebe im Blattbildungsteil einer Papiermaschine einzusetzen. Der Vorteil der Spiralbänder besteht dabei vor allem darin, dass keine Naht vorhanden ist und die Spiralbänder offen geliefert werden können und erst in der Papiermaschine durch Einfügen des letzten Steckdrahtes endlos gemacht werden.At the same time, the aim is to use particularly fine spiral screens in the sheet forming part of a paper machine. The main advantage of the spiral tapes is that there is no seam and the spiral tapes can be delivered open and can only be made endless in the paper machine by inserting the last plug-in wire.

In der Pressenpartie einer Papiermaschine sind die Spiralbänder insbesondere von Vorteil, wenn nicht eine konventionelle Presse mit praktisch linienförmiger Press-Zone vorhanden ist, sondern eine Presse mit erweiterter Pressspaltzone, die als "extended nip press" bezeichnet werden. Die Spiralbänder sind hier insbesondere wegen des freien Volumens innerhalb der Spiralen vorteilhaft, wenn sie zwischen Presswalze und Entwässerungsfilz eingesetzt werden. Ein offener "Fabric-Press" aus Spiralen kann dabei häufig die teuere Rillenwalze erübrigen.In the press section of a paper machine, the spiral belts are particularly advantageous if there is not a conventional press with a practically linear press zone, but a press with an extended press nip zone, which is referred to as an "extended nip press". The spiral belts are particularly advantageous here because of the free volume inside the spirals when they are used between the press roller and the dewatering felt. An open "fabric press" made of spirals can often make the expensive grooved roller superfluous.

Bei allen vorgenannten Anwendungsfällen, wird die Lebensdauer der Spiralbänder durch den Abrieb begrenzt.In all of the above applications, the life of the spiral tapes is limited by abrasion.

Der Erfindung liegt die Aufgabe zugrunde, die Abriebbeständigkeit eines Spiralbandes zu verbessern, ohne zu komplexen, mehrlagigen Spiralsystemen Zuflucht zu nehmen.The invention has for its object to improve the abrasion resistance of a spiral tape without resorting to complex, multi-layer spiral systems.

Diese Aufgabe wird dadurch gelöst, dass die Spiralen teils aus Polyamid, oder aus einem anderen abriebfesten Kunststoffmaterial teils aus Polyester und die Steckdrähte aus Polyester bestehen.This object is achieved in that the spirals are made partly of polyamide or of another abrasion-resistant plastic material partly made of polyester and the plug wires are made of polyester.

Die Spiralen können dabei abwechselnd oder in einer beliebigen anderen Reihenfolge aus diesen beiden Materialien bestehen. Am einfachsten lassen sich Spiralbänder mit abwechselnd unterschiedlichem Material der Spiralen herstellen.The spirals can consist of these two materials alternately or in any other order. The easiest way to make spiral tapes with alternating material of the spirals.

Eine weitere Erhöhung der Laufzeit ergibt sich dadurch, dass die aus Polyamid bestehenden Spiralen aus dickerem Material hergestellt sind als die aus Polyester bestehenden Spiralen. Das Abriebvolumen lässt sich hierbei weiter erhöhen, indem die höchsten Punkte der Spiralen auf der Papierseite in einer Ebene liegen, während auf der Laufseite die Polyamid-Spiralen entsprechend weiter hervorstehen.A further increase in the running time results from the fact that the spirals made of polyamide are made of thicker material than the spirals made of polyester. The volume of abrasion can be increased further by the highest points of the spirals lying on one level on the paper side, while the polyamide spirals protrude accordingly on the running side.

Gegenstand der Erfindung ist ferner die Herstellung eines Spiralbandes in der zuletzt genannten Ausgestaltung, indem das Spiralband beim Thermofixieren unter hoher Längsspannung über eine beheizte Fixierwalze oder einen beheizten, gekrümmten Stütztisch geführt wird.The invention furthermore relates to the production of a spiral belt in the last-mentioned embodiment, in that the spiral belt is guided over a heated fixing roller or a heated, curved support table during heat setting under high longitudinal tension.

Bei dem Einsatz des erfindungsgemässen Spiralbandes als Stützband in der Pressenpartie einer Papiermaschine ist es von Bedeutung, dass das erfindungsgemässe Spiralband wegen der weitgehend druckunempfindlichen Polyamid-Spiralen sowohl die geforderte Abriebfestigkeit als auch eine verbesserte Druckbeständigkeit aufweist.With the use of the inventive spiral belt as S tützband in the press section of a paper machine it is of importance that the inventive spiral belt and has an improved pressure resistance because of largely pressure-resistant polyamide spirals both the required abrasion resistance.

Die Druckbeständigkeit des Spiralbandes kann des weiteren durch zusätzliche Fülldrähte gesteigert werden. Diese Fülldrähte bestehen aus monofilem Polyester, Polyamid oder anderem Kunststoffmaterial. Der Durchmesser der Fülldrähte ist gleich oder grösser als der Durchmesser der Steckdrähte.The D jerk resistance of the spiral belt can be further increased by additional filler wires. This F ülldrähte composed of monofilament polyester, polyamide or other plastic material. The diameter of the ülldrähte F is equal to or greater than the diameter of the plug wires.

Wird das Spiralband in einer sogenannten "extended nip press" eingesetzt, so wird es zumindest einseitig mit einer Polyurethan-Schicht versehen, die eine glattgeschliffene Oberfläche besitzt, damit die Druckflüssigkeit im Druckbereich dicht abgeschlossen wird. Die offene, der Papierbahn zugewandte Bandseite bietet ein ausreichendes Volumen zur Aufnahme des ausgepressten Wassers und zu dessen Transport heraus aus der Press-zone.If the spiral tape is used in a so-called "extended nip press", it is provided on at least one side with a polyurethane layer, which has a smoothly ground surface, so that the pressure fluid is sealed off in the pressure area. The open hinge side facing the paper web offers sufficient volume to absorb the squeezed water and to transport it out of the press zone.

Bisher sind die Spiralbänder aus Stabilitätsgründen ausschliesslich aus Polyester-Monofilen hergestellt worden. Obwohl Polyamid abriebbeständiger ist als Polyester, sind bisher keine Spiralbänder aus Polyamid eingesetzt worden, da deratige Spiralbänder keine ausreichende Längsstabilität erwarten lassen, d.h. sich zu stark dehnen. Insbesondere in der Papiermaschine ist eine hohe Dehnung zu erwarten. Wegen der bei Polyamid besonders hohen Wasseraufnahme würde sich ausserdem die Breite des Spiralbandes beträchtlich ändern. Je nach der Wasseraufnahme kann die Breitenänderung dabei längs des Spiralbandes unterschiedlich sein. Wegen der hohen Längsspannung, die in einer Papiermaschine auf ein derartiges Spiralband ausgeübt wird, würde eine derartige Breitenschwankung des Spiralbandes zur Bildung von Wellen im Spiralband führen, die leicht Längsfalten verursachen und das Spiralband unbrauchbar machen.So far, the spiral tapes have been made exclusively from polyester monofilaments for reasons of stability. Although polyamide is more resistant to abrasion than polyester, no spiral tapes made of polyamide have been used so far, because such spiral tapes cannot be expected to have sufficient longitudinal stability, ie they stretch too much. A high elongation is to be expected in particular in the paper machine. Because of the particularly high water absorption in polyamide, the width of the spiral belt would also change considerably. Depending on the water absorption, the change in width can be along the spiral band be different. Because of the high longitudinal tension exerted piralband in a paper machine to such S, such a fluctuation in width of the spiral belt in the formation of waves in the S would lead piralband which easily cause longitudinal folds and to make the spiral belt unusable.

Beim erfindungsgemässen Spiralband wirken die Polyester-Spiralen und die ebenfalls aus Polyester bestehenden Steckdrähte stabilisierend auf die Breite des Spiralbandes und geben ihm eine ausreichende Querstabilität. Zur Querstabilität tragen auch die Abkröpfungen der Steckdrähte bei, die sich bei der Thermofixierung des Spiralbandes in Folge der Einwirkung der erhöhten Temperatur und der auf das Siebband ausgeübten Spannung dadurch ausbilden, dass die Kopfbögen der Spiralen etwas in das Material der Steckdrähte eindringen, so dass diese in etwa wellenförmig werden. Im fertigen Spiralband besteht dadurch ein teils form- und teils kraftflüssiger Eingriff zwischen den Steckdrähten und den Spiralen.In the spiral tape according to the invention, the polyester spirals and the plug wires, which are also made of polyester, have a stabilizing effect on the width of the spiral tape and give it sufficient transverse stability. The offset of the plug-in wires also contributes to the transverse stability, which is formed during the heat-setting of the spiral belt as a result of the effect of the elevated temperature and the tension exerted on the sieve belt by the fact that the head bends of the spirals penetrate somewhat into the material of the plug-in wires, so that these become roughly wavy. In the finished spiral band, there is a partly form-fitting and partly force-engaging engagement between the plug wires and the spirals.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung näher erläutert. Es zeigen:

  • Fig. 1 in Draufsicht einen Teilausschnitt eines Spiralbandes;
  • Fig. 2 einen Ausschnitt eines Spiralbandes im Schnitt;
  • Fig. 3 bis 5, das Thermofixieren des Spiralbandes, wobei es über eine beheizte Fixierwalze gezogen wird, und
  • Fig. 6 bis 9, die Verformung des Steckdrahtes im Spiralsieb.
Exemplary embodiments of the invention are explained in more detail below with reference to the drawing. Show it:
  • Figure 1 is a plan view of a partial section of a spiral belt.
  • Figure 2 shows a section of a spiral belt in section.
  • FIGS. 3 to 5, the T hermofixieren wherein it is drawn over a heated fuser roll of the spiral belt, and
  • 6 to 9, the deformation of the plug wire in the spiral sieve.

Fig. 1 zeigt das reissverschlussartige Ineinandergreifen der aus Polyester bestehenden Spiralen 1 und der aus Polyamid bestehenden Spiralen 2. Der Anteil beider Spiralarten kann nach den Bedürfnissen des Einzelfalls gewählt werden und es können auf eine Polyamid-Spirale 1, 2, 3 usw. Polyester-Spiralen folgen oder umgekehrt.1 shows the zipper-like interlocking of the spirals 1 consisting of polyester and the spirals consisting of polyamide 2. The proportion of both types of spirals can be selected according to the needs of the individual case and it can be based on a polyamide spiral 1, 2, 3, etc. Follow spirals or vice versa.

Wie in Fig. 2 erkennbar ist, überlappen sich benachbarte Spiralen jeweils soweit, dass sie gemeinsam einen querverlaufenden Kanal begrenzen, durch den Steckdrähte 3 eingeführt sind, die die Spiralen sichern.As can be seen in FIG. 2, adjacent spirals overlap each other to such an extent that they jointly delimit a transverse channel through which plug-in wires 3 are inserted, which secure the spirals.

Die Abstände der Steckdrähte 3 sind im allgemeinen gleich. Im Einzelfall können die Abstände jedoch auch unterschiedlich sein. Werden für die Polyamid-Spiralen 2 Monofile von grösserem Durchmesser verwendet als für die Polyester-Spiralen 1, so können sich Markierungsprobleme ergeben, da der Abstand zwischen den einzelnen Windungen dann bei den Polyamid-Spiralen 2 kleiner ist als bei den Polyester-Spiralen 1. Dies kann zum Teil dadurch ausgeglichen werden, dass die Polyester-Spiralen 1 in Längsrichtung des Spiralbandes kürzer sind und der Abstand der entsprechenden Steckdrähte 3 innerhalb einer Polyester-Spirale 1 kleiner ist als innerhalb einer Polyamid-Spirale 2. Die offene Fläche zwischen zwei aufeinanderfolgenden Windungen einer Polyester-Spirale 1 kann dadurch gleich gross gewählt werden wie die offene Fläche zwischen zwei aufeinanderfolgenden Windungen einer Polyamid-Spirale 2.The distances between the plug wires 3 are generally the same. In individual cases, however, the distances can also be different. Be used for the polyamide spirals 2 M onofile of greater diameter than polyester spirals for 1 so can marking problems arise because the distance between the individual windings then in the polyamide spirals 2 is smaller than that of the polyester spirals 1 This can be compensated in part by the fact that the polyester spirals 1 are shorter in the longitudinal direction of the spiral band and the distance between the corresponding plug wires 3 within a polyester spiral 1 is smaller than within a polyamide spiral 2. The open area between two successive ones Windings of a polyester spiral 1 can thus be selected to be the same size as the open area between two successive windings of a polyamide spiral 2.

Der Durchmesser der Polyamid-Monofile kann bis zu 30 % grösser sein als der der Polyester-Monofile. Der grössere Materialquerschnitt der Polyamid-Spiralen 2 vergrössert das für den Abrieb zur Verfügung stehende Materialvolumen und verringert gleichzeitig den Unterschied in der Bruchdehnung und der Dehnung in Längsrichtung des Spiralbandes zwischen den Polyester-Spiralen 1 und den Polyamid-Spiralen 2.The diameter of the polyamide monofilament can be up to 30% larger than that of the polyester monofilament. The larger material cross section of the polyamide spirals 2 increases the material volume available for abrasion and at the same time reduces the bottom differed in the elongation at break and the elongation in the longitudinal direction of the spiral band between the polyester spirals 1 and the polyamide spirals 2.

Die grössere Materialdicke der Polyamid-Spiralen 2 entzieht die Polyester-Spiralen 1 weitgehend dem Abrieb. Dieser Effekt kann noch dadurch verstärkt werden, dass die obersten Punkte beider Spiralenarten auf der Papierseite in einer Ebene liegen und die Polyamid-Spiralen 2 auf der Laufseite entsprechend weiter vorstehen. Liegt die Oberseite der Spiralen auf der Papierseite in einer Ebene, so wird das Spiralband als "monoplan" bezeichnet. In diesem Fall stehen die Polyamid-Spiralen auf der Laufseite um den doppelten Durchmesser Unterschied hervor. In Fig. 2 ist das Vorstehen der Polyamid-Spiralen 2 dargestellt, wobei die Abmessung a kleiner ist als die Abmessung b. Der Unterschied der Drahtdurchmesser ist in Fig. l und 2 zur Verdeutlichung übertrieben gross dargestellt.The greater material thickness of the polyamide spirals 2 largely removes the polyester spirals 1 from abrasion. This effect can be enhanced by the fact that the uppermost points of both types of spirals on the paper side lie in one plane and that the polyamide spirals 2 protrude further on the running side. If the top of the spirals lies on one level on the paper side, the spiral band is referred to as "monoplan". In this case, the polyamide spirals on the barrel side protrude by twice the diameter difference. 2 shows the protrusion of the polyamide spirals 2, the dimension a being smaller than the dimension b. The difference in the wire diameter is shown exaggeratedly large in FIGS. 1 and 2 for clarification.

Die einseitige Glättung (Monoplanität) des Spiralbandes kann erreicht werden, indem es beim Thermofixieren mit derjenigen Seite, die später als Papierseite dient, bei hoher Längsspannung über eine beheizte Fixierwalze 4 (Fig. 3) oder einen beheizten, gekrümmten Stütztisch geführt wird. Fig. 4 zeigt in Vergrösserung die Spiralen mit symmetrischer Anordnung vor dem Fixieren, während Fig. 5 die gegenseitige Verlagerung der Spiralen nach dem Fixieren zeigt. Im allgemeinen kann beim Fixieren alleine keine vollständige Monoplanität des Spiralbandes erreicht werden. Gegebenenfalls muss die Papierseite durch Schleifen weiter geglättet werden.The one-sided smoothing (monoplanarity) of the spiral belt can be achieved by heat-fixing it with the side that will later serve as the paper side, with a high longitudinal tension over a heated fixing roller 4 (FIG. 3) or a heated, curved support table. FIG. 4 shows the spirals with a symmetrical arrangement before fixing in enlarged form, while FIG. 5 shows the mutual displacement of the spirals after fixing. In general, a complete monoplanarity of the spiral band cannot be achieved when fixing alone. If necessary, the paper side must be smoothed further by sanding.

Beim Fixieren wird die Längsspannung und die Temperatur so gewählt, dass die Steckdrähte 3 in Längsrichtung verformt werden. Dies wird als Abkröpfung in der X-Y-Ebene bezeichnet, wobei die X-Richtung die Lauf- oder Längsrichtung des Spiralbandes ist, siehe Fig. 6.When fixing the longitudinal tension and the temperature is selected so that the plug wires 3 ver in the longitudinal direction be shaped. This is referred to as a bend in the XY plane, the X-direction is the running or longitudinal direction of the spiral belt, see F ig. 6.

In der Z-Richtung, also senkrecht zur Ebene des Spiralbandes, sind die Steckdrähte bei herkömmlichen Spiralbändern kaum verformt, denn die während des Fixierens wirkenden Kräfte liegen ausschliesslich in der X-Y-Ebene, d.h. wirken in X-Richtung (Fig. 7).In the Z direction, i.e. perpendicular to the plane of the spiral band, the plug wires are hardly deformed in conventional spiral bands, because the forces acting during fixing lie exclusively in the X - Y plane, ie act in the X direction (Fig. 7) .

Bei ungleichem Materialdurchmesser aufeinanderfolgender Spiralen treten beim Fixieren auf einer Fixierwalze 4 oder einem Stütztisch jedoch auch Kraftkomponenten auf, die in Z-Richtung wirken, wodurch die Steckdrähte 3 zusätzlich auch in dieser Richtung verformt werden, siehe Figuren 8 und 9. Diese Kraftkomponente und die entsprechende Verformung der Steckdrähte in Z-Richtung wird durch die Verlagerung der Polyamid-Spiralen 2 zur Laufseite hin bewirkt. Diese Verformung der Steckdrähte 3 ist bleibend und bleibt nach Beendigung des Fixiervorgangs erhalten.If the material diameter of successive spirals is different, force components that act in the Z direction also occur when fixing on a fixing roller 4 or a support table, as a result of which the plug wires 3 are additionally deformed in this direction, see FIGS. 8 and 9. This force component and the corresponding one Deformation of the plug wires in the Z direction is caused by the displacement of the polyamide spirals 2 towards the barrel side. This deformation of the plug wires 3 is permanent and is retained after the fixing process has ended.

Beim Einsatz des Spiralbandes als Filter ist die Verschmutzung durch schleimartige Niederschläge und batzenförmige verunreinigungen sehr gross. Um eine Verstopfung der freien Räume durch die Schmutzteile zu vermeiden, kann das Spiralband mit einer schmutzabweisenden Beschichtung versehen werden. Dazu wird das Spiralband chemisch gereinigt, um Fettreste von der Materialoberfläche zu entfernen. Danach wird die schmutzabweisende Substanz, z.B. Fluorkarbonharz, allein oder zusammen mit weiteren Chemikalien aufgetragen und bei 160 °C kondensiert. Mit einer derartigen schmutzabweisenden Beschichtung versehene Spiralbänder müssen nicht so oft gereinigt werden, wodurch die Stillstandszeiten und die Reinigungskosten verringert werden.When using the spiral belt as a filter, the contamination from slimy precipitation and lump-like contamination is very large. In order to avoid clogging of the free spaces by the dirt parts, the spiral tape can be provided with a dirt-repellent coating. For this purpose, the spiral belt is chemically cleaned to remove grease residues from the material surface. Thereafter, the dirt-repellent substance, for example, fluorocarbon resin, either alone or together with other applied chemicals and condensed at 16 0 ° C. Spiral tapes provided with such a dirt-repellent coating do not have to be cleaned as often, as a result of which the downtimes and the Be reduced R agreement cost.

Wahlweise zusätzlich vorhandene Fülldrähte 5 erhöhen die Druckbeständigkeit des Spiralbandes. Die Fülldrähte 5 verlaufen in den Hohlräumen der Spiralen und ihr Durchmesser ist gleich oder grösser als der der Steckdrähte 3.Increase Optionally, additional available cored wires 5, the D jerk resistance of the spiral belt. The cored wires 5 run in the cavities of the spirals and their diameter is equal to or larger than that of the plug wires 3.

Beispiel:Example:

Ein Spiralband mit Spiralen, die abwechselnd aus Polyamid und Polyester im Verhältnis 1 : 1 bestehen und mit , Polyester-Steckdrähten wird in der üblichen Weise zusammengesetzt.A spiral tape with spirals, which alternately consist of polyamide and polyester in a ratio of 1: 1 and with polyester plug wires, is assembled in the usual way.

Die Polyester-Spiralen bestehen aus einer längsstabilen, d.h. dehnungsarmen, Polyester-Monofiltype und haben einen Durchmesser von 0,7 mm, der Abstand der Steckdrähte ist gleichmässig und beträgt 5 mm. Die Abmessung der Spiralen senkrecht zur Ebene des Spiralbandes beträgt 2,5 mm, die Spiralen haben also einen ovalen Querschnitt.The polyester spirals consist of a longitudinally stable, i.e. low-stretch, polyester monofilament and have a diameter of 0.7 mm, the distance between the plug wires is even and is 5 mm. The dimension of the spirals perpendicular to the plane of the spiral band is 2.5 mm, so the spirals have an oval cross-section.

Die Polyamid-Spiralen bestehen aus einem Monofil von 0,8 mm Durchmesser und sind damit um ca. 15 % dicker als das Polyester-Monofil. Während die Abmessung der Polyamid-Spiralen in Längsrichtung 5 mm beträgt und damit gleich der entsprechenden Abmessung der Polyester-Spiralen ist, beträgt die Abmessung senkrecht zur Ebene des Spiralbandes 2,65 mm. Nach dem Fixieren liegen die Polyamid-Spiralen auf der Papierseite (Oberseite) des Spiralbandes 0,04 mm höher die Polyester-Spiralen. Auf der Laufseite (Unterseite) stehen die Polyamid-Spiralen ca. 0,11 mm über die Polyester-Spiralen hinaus.The polyamide spirals consist of a monofilament with a diameter of 0.8 mm and are therefore approx. 15% thicker than the polyester monofilament. While the dimension of the polyamide spirals in the longitudinal direction is 5 mm and is therefore equal to the corresponding dimension of the polyester spirals, the dimension perpendicular to the plane of the spiral band is 2.65 mm. After fixing, the polyamide spirals are on the paper side (top) of the spiral tape 0.04 mm higher than the polyester spirals. On the running side (bottom), the polyamide spirals protrude approximately 0.11 mm beyond the polyester spirals.

Die Teilung der Spiralen in Querrichtung des Spiralbandes beträgt etwa 6 Windungen/cm. Die Steckdrähte bestehen aus einer bei Druck- und Wärmeeinwirkung leicht verformbaren Polyester- Monofiltype und haben einen Durchmesser von 0,9 mm. Das fertige Spiralband wiegt etwa 1390 g/m2.The division of the spirals in the transverse direction of the spiral album that is about 6 turns / cm. The plug wires consist of a polyester monofilament type that is easily deformable under pressure and heat and have a diameter of 0.9 mm. The finished spiral belt weighs about 139 0 g / m2.

Im übrigen ist das Spiralband von der aus der DE-OS 29 38 221 bekannten Art, d.h. die Spiralen weisen keine zugfedermässige Vorspannung auf, die Spiralen sind so hergestellt, dass das Kunststoffmonofil keine Torsion aufweist und das Siebband ist so thermofixiert, dass die Spiralen etwas in das Material der Steckdrähte eindringen und diesen dadurch Wellenform geben.For the rest, the spiral band is of the type known from DE-OS 29 38 221, i.e. the spirals have no tension, the spirals are made in such a way that the plastic monofilament has no torsion and the sieve belt is heat-set so that the spirals penetrate the material of the plug wires somewhat and give them a wave shape.

Claims (5)

1. Spiralband aus einer Vielzahl von Spiralen (1 ,2), deren Windungen reissverschlussartig ineinandergefügt sind und durch Steckdrähte (3) gesichert sind, die in den Kanal eingefügt sind, der von den sich überlappenden Windungsbögen gebildet ist, dadurch gekennzeichnet,
dass die Spiralen (1, 2) teils aus Polyester und teils aus einem abriebfesten, druck- und hydrolysebeständigen Material, vorzugsweise aus Polyamid bestehen und die Steckdrähte (3) aus Polyester bestehen.1. Spiral tape made up of a plurality of spirals (1, 2), the turns of which are inserted into one another in the manner of a zipper and secured by plug wires (3) which are inserted into the channel formed by the overlapping turns of the turn, characterized in that
that the spirals (1, 2) partly made of polyester and partly made of an abrasion-resistant, pressure and hydrolysis-resistant material, preferably made of polyamide and the plug wires (3) made of polyester. 2. Spiralband nach Anspruch 1, dadurch gekennzeichnet, dass die Spiralen (2), die aus Polyamid bestehen, einen grösseren Durchmesser aufweisen als die Spiralen (1), die aus Polyester bestehen.2. Spiral tape according to claim 1, characterized in that the spirals (2), which consist of polyamide, have a larger diameter than the spirals (1), which consist of polyester. 3. Spiralband nach Anspruch 2, dadurch gekennzeichnet, dass auf der einen Seite des Spirälbandes, die obersten Punkte aller Spiralen weitgehend in einer Ebene liegen, während auf der anderen Seite des Spiralbandes die Spiralen (2), die aus Polyamid bestehen, gegenüber den Spiralen (1), die aus Polyester bestehen, hervorstehen.3. Spiral belt according to claim 2, characterized in that on one side of the spiral belt, the uppermost points of all spirals lie largely in one plane, while on the other side of the spiral belt, the spirals (2), which consist of polyamide, with respect to the spirals (1) made of polyester protrude. 4. Spiralband nach Anspruch 2, dadurch gekennzeichnet, dass im Innern der Spiralen monofile Fülldrähte (5) aus Kunststoff durchgezogen sind, wobei der Durchmesser dieser Fülldrähte gleich oder grösser als der Durchmesser der Steckdrähte (3) ist.4. Spiral tape according to claim 2, characterized in that in the interior of the spirals monofilament cored wires (5) made of plastic, the diameter of these cored wires being equal to or larger than the diameter of the plug wires (3). 5. Verfahren zur Herstellung eines Spiralbandes nach Anspruch 3, dadurch gekennzeichnet, dass das Spiralband beim Thermofixieren unter hoher Längsspannung über eine beheizte Fixierwalze (4) gezogen wird.5. A method for producing a spiral tape according to claim 3, characterized in that the spiral tape is pulled during heat setting under high longitudinal tension over a heated fixing roller (4).
EP83104732A 1982-05-14 1983-05-13 Link belt and method of making the same Ceased EP0094638A3 (en)

Applications Claiming Priority (2)

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DE3218295 1982-05-14
DE3218295 1982-05-14

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3411112A1 (en) * 1984-03-26 1985-10-03 Fa. F. Oberdorfer, 7920 Heidenheim SPIRAL SCREEN
EP0230228A2 (en) * 1986-01-21 1987-07-29 Bayer Ag Method for producing spiral fabric and spiral fabric produced by this method
GB2196927A (en) * 1986-11-08 1988-05-11 Edward W Andrew Ltd Conveyor belt or surface
EP1507039A1 (en) * 2003-08-13 2005-02-16 Heimbach GmbH & Co. Papermaking fabric
JP2015020855A (en) * 2013-07-18 2015-02-02 太陽金網株式会社 Mesh belt with step surface

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2255364A (en) * 1939-08-07 1941-09-09 Clarence E Pink Conveyer belt
DE2419751A1 (en) * 1974-04-24 1975-12-04 Kerber Hella Wire mesh structure - uses prepared material embossed and thermofixed to give interlock when twisted into the mesh
EP0018200A1 (en) * 1979-04-21 1980-10-29 Scapa-Porritt Limited Conveying and like structures

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2255364A (en) * 1939-08-07 1941-09-09 Clarence E Pink Conveyer belt
DE2419751A1 (en) * 1974-04-24 1975-12-04 Kerber Hella Wire mesh structure - uses prepared material embossed and thermofixed to give interlock when twisted into the mesh
EP0018200A1 (en) * 1979-04-21 1980-10-29 Scapa-Porritt Limited Conveying and like structures

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3411112A1 (en) * 1984-03-26 1985-10-03 Fa. F. Oberdorfer, 7920 Heidenheim SPIRAL SCREEN
EP0168554A1 (en) * 1984-03-26 1986-01-22 F. Oberdorfer GmbH &amp; Co. KG Industriegewebe-Technik Spiral fabric
EP0230228A2 (en) * 1986-01-21 1987-07-29 Bayer Ag Method for producing spiral fabric and spiral fabric produced by this method
EP0230228A3 (en) * 1986-01-21 1989-07-26 Bayer Ag Method for producing spiral fabric and spiral fabric produced by this method
GB2196927A (en) * 1986-11-08 1988-05-11 Edward W Andrew Ltd Conveyor belt or surface
GB2196927B (en) * 1986-11-08 1990-09-05 Edward W Andrew Ltd Conveying non-conductive materials.
EP1507039A1 (en) * 2003-08-13 2005-02-16 Heimbach GmbH & Co. Papermaking fabric
US7279074B2 (en) 2003-08-13 2007-10-09 Heimbach Gmbh & Co. Paper machine clothing
CN100513684C (en) * 2003-08-13 2009-07-15 亨巴赫有限公司及两合公司 Papermaking fabric
JP2015020855A (en) * 2013-07-18 2015-02-02 太陽金網株式会社 Mesh belt with step surface

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Publication number Publication date
EP0094638A3 (en) 1986-02-05
ES279978U (en) 1985-06-01

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