EP0139852A1 - Process for a drying and an immediately following fixing treatment of a running web material and tenter for carrying out the process - Google Patents

Process for a drying and an immediately following fixing treatment of a running web material and tenter for carrying out the process Download PDF

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Publication number
EP0139852A1
EP0139852A1 EP84107770A EP84107770A EP0139852A1 EP 0139852 A1 EP0139852 A1 EP 0139852A1 EP 84107770 A EP84107770 A EP 84107770A EP 84107770 A EP84107770 A EP 84107770A EP 0139852 A1 EP0139852 A1 EP 0139852A1
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EP
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Prior art keywords
treatment
energy
per unit
amount
time
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EP84107770A
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German (de)
French (fr)
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EP0139852B1 (en
Inventor
Theo Schiffers
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Cessione h Krantz Textiltechnik GmbH
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H Krantz GmbH and Co
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Priority to AT84107770T priority Critical patent/ATE32538T1/en
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C7/00—Heating or cooling textile fabrics
    • D06C7/02—Setting
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C3/00—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics
    • D06C3/02—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics by endless chain or like apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials

Definitions

  • the invention relates to a method according to the preamble of claim 1 and extends to a clamping frame for performing the method.
  • the temperatures prevailing over the treatment path are measured continuously in order to correct the amounts of energy expended depending on the deviations from the target temperatures required for the optimal treatment and, if necessary, to adapt the treatment speed to an average of the temperature deviations, so that For example, the speed at which a material web is guided through a tenter frame is slowed to the extent and for the duration that the temperature falls below or falls below the target temperatures.
  • temperature sensors In order to determine the temperature profile over the length of a treatment section as precisely as possible, temperature sensors must be provided in a correspondingly dense sequence along the treatment section. Contactless temperature sensors such as radiation pyrometers are very expensive. Their use to determine the temperature profile over the treatment line allows an optimization of the web speed and thus an energy saving, but the investment required to do so largely removes the operating cost advantage. Inexpensive non-contact temperature measuring devices are also known (cf. "Textile Company" April 1981, p. 55), but only have a few Millimeter-thick boundary layer can be arranged so that contact of the measuring devices with the web cannot be excluded and markings can occur on the web.
  • the amount of heat given off by the heated treatment medium to the product web which is proportional to the difference between the temperature of the incoming treatment medium and the temperature of the product, is a function of the difference in temperature of the incoming treatment medium and the temperature of the reflected or flowed through treatment medium.
  • this measuring method delivers a temperature profile corresponding to the web temperature.
  • the invention has for its object to optimize the duration of treatment in the heat treatment of textile goods and also to determine the temperature profile of the textile goods over the treatment line, but without measuring the respective temperature of the textile goods directly or the temperatures of the inflowing and outflowing treatment medium Need to become.
  • the invention proposes to proceed in such a way that the Marenbahn speed is regulated as a function of the point on the treatment line at which the maximum deviation in the amount of energy expended per unit of time for two streams of successive treatment line parts occurs.
  • the procedure can be such that the fields of a tenter frame are first supplied with heated treatment medium in idle mode and the amount of energy required per unit of time for each current to maintain the target temperature in the fields is measured.
  • the material web to be treated is then introduced into the stenter and then the amount of energy required to maintain the target temperature in each field per unit of time is also measured. Then the difference between the two amounts of energy of each stream is determined and finally, depending on the location of the treatment section at which the maximum deviation of the determined difference values of the amounts of energy for the streams of successive fields occurs, the web speed is regulated.
  • the method according to the invention can be used in such a way that values of the amounts of energy expended per unit of time are fed to a computer which compares the location of the treatment line with the maximum value deviation with a target location of the treatment line, whereupon the web speed is corrected accordingly in order to adhere to a predefined drying time and also a predefined fixing period.
  • the method according to the invention takes advantage of the knowledge that the amounts of heat supplied, for example, the degree of opening of valves of the treatment medium streams are proportional.
  • the valve positions can be tapped electrically in a manner known per se and displayed, for example, by means of light-emitting diodes.
  • the stenter can first be heated. After the temperature has been reached, a certain amount of Märme consumption occurs with the valve positions also determined. The resulting measurement values can be trimmed to zero. In this way, the idle power of the stenter, that is, the portion that results from machine-related losses, can be eliminated. After the material web has been run into the stenter, new measured values result which only correspond to the portion for heating the material web and for evaporating the water. In this way, the transition point on the treatment line between the dry treatment and the fixing treatment can be displayed.
  • a stenter from several drying and fixing fields each with a fan circulating a stream of a gaseous treatment medium in the circuit and a heating device for maintaining the current at the treatment temperature for carrying out the method according to the invention, is preferably equipped in such a way that the probe of a thermometer is arranged in the circuit of the treatment medium, that in connection with a heating controller is connected to which a valve changing the amount of energy flowing to the heating device is connected, the respective position of which can be detected.
  • the heating device consists of a heating register arranged on the suction side of the fan or a gas or oil burner, the probe of the thermometer being arranged behind the heating device in the flow direction.
  • a burner 5 arranged on the suction side of a fan 4 heats up the treatment medium, the temperature of which continuously on the pressure side of the fan 4 is measured. Via a line 6, the temperature is given to a heating controller 7 as an actual value, to which a setpoint is additionally given via a line 8.
  • a heating valve 10 in a fuel supply line 11 is controlled via a line 9, via which the burner 5 is supplied with a corresponding amount of fuel. The respective position of the heating valve 10 is made visible by a display instrument 12.
  • the temperature of the treatment medium is thus measured in the flow direction behind the burner 5 and before the material web 1 is loaded.
  • the actual value determined in this way is compared in heating controller 7 with the setpoint, i.e. the set temperature. If the actual value is below the target value, the heating controller 7 opens the heating valve 10 and closes it again step by step if the actual value is greater than the target value.
  • the heat balance of a drying and fixing process can be represented as follows, for example:
  • the heat quantities under a), b) and c) form the idle heat requirement of the stenter.
  • the heat quantities under d) and e) are the quantities to be applied for the goods. From this it can be seen that the drying process requires a multiple of the thermal energy of the fixing process.
  • each stenter frame is provided with a heating valve and a display instrument which makes the valve position visible, the decrease in the consumption of heating energy can be determined over the length of the treatment section from one measuring point to the next, which indicates the point on the treatment section where the drying process ends is and the fixing process begins.
  • a display instrument 13 symbolizes the length of a schematically illustrated clamping frame 14 from seven fields 15 arranged one behind the other over the treatment path.
  • the transition point between drying and fixing treatment should lie in the tenter 14 where this is cut by a line 16.
  • FIG. 2 the display instrument 13 shows that a too short fixing section 17 results from the selected Uarenbahn speed, which is preceded by a drying section 18 which is too long.
  • FIG. 3 illustrates a fixing section 17 that is too long and a drying section 18 that is too short.
  • the fixing section 17 and the drying section 18 are coordinated with one another in such a way that their transition through line 16 is determined. Only in this example is that Web speed optimal, so that the dry treatment time as well as the fixing treatment time is as short as possible, but also as long as necessary.

Abstract

For a method for heat-treating textile material, and for a tenter for carrying out the method, it is proposed to control the textile web velocity as a function of the point on the treatment path at which the maximum deviation in the amount of energy spent per unit time occurs. To determine this point on the treatment path it is not necessary, therefore, to measure the momentary temperature of the textile material directly or the temperatures of the treatment medium flowing in and out. Instead, it suffices to determine the individual valve positions which indicate the amounts of energy supplied per unit time, and to infer therefrom the site of the treatment path where the drying process is completed and the fixing process sets in.

Description

Die Erfindung betrifft ein Verfahren nach dem Gattungsbegriff des Anspruchs 1 und erstreckt sich auf einen Spannrahmen zur Durchführung des Verfahrens.The invention relates to a method according to the preamble of claim 1 and extends to a clamping frame for performing the method.

Bei derartigen, allgemein bekannten Verfahren erfolgt eine dauernde Messung der über die Behandlungsstrecke herrschenden Temperaturen, um je nach den Abweichungen von den für die optimale Behandlung erforderlichen Solltemperaturen eine Korrektur der aufgewendeten Energiemengen herbeizuführen und um erforderlichenfalls auch die Behandlungsgeschwindigkeit einem Mittelwert der Temperaturabweichungen anzupassen, so daß beispielsweise die Geschwindigkeit, mit der eine Warenbahn durch einen Spannrahmen geführt wird, verlangsamt wird in dem Maße und für die Dauer, in dem bzw. für die Solltemperaturen unterschritten werden.In such, generally known methods, the temperatures prevailing over the treatment path are measured continuously in order to correct the amounts of energy expended depending on the deviations from the target temperatures required for the optimal treatment and, if necessary, to adapt the treatment speed to an average of the temperature deviations, so that For example, the speed at which a material web is guided through a tenter frame is slowed to the extent and for the duration that the temperature falls below or falls below the target temperatures.

Es ist bekannt, daß bei gleichmäßigen Trocknungsbedingungen Textilgut so lange eine nahezu konstante Temperatur beibehält, bis eine bestimmte, je nach Faserart verschiedene kritische Restfeuchte erreicht ist, worauf die Trocknungsgeschwindigkeit merklich absinkt und die Textilguttemperatur gleichmäßig ansteigt (vgl. "tlelliand Textilberichte" 8/1965, S. 887). Ist das Gewebe vollkommen trocken, findet naturgemäß keine Wasserverdampfung mehr statt, für die während des Trocknungsprozesses ein entsprechender Energieanteil aufzuwenden war. Das Gewebe erreicht somit wiederum eine annähernd konstante Temperatur über die restliche Behandlungsdauer.It is known that, under uniform drying conditions, textile material maintains an almost constant temperature until a certain critical residual moisture, which varies depending on the type of fiber, is reached, whereupon the drying speed drops noticeably and the temperature of the textile material rises evenly (cf. "tlelliand textile reports" 8/1965 , P. 887). If the fabric is completely dry, there is naturally no more water evaporation, for which there is a corresponding amount of energy during the drying process was to be spent. The tissue in turn reaches an almost constant temperature over the remainder of the treatment.

Für die Einstellung einer optimalen Behandlungsgeschwindig- keit,durch die beispielsweise das Verhältnis Trocken- behandlunqsdauer:Fixierbehandlungsdauer bestimmt wird, ist es erforderlich, die Stelle aus der Behandlungsstrecke zu ermitteln, an der das Textilgut die kritische Restfeuchte aufveist. Wegen des an dieser Stelle einsetzenden Temperaturanstiegs wurde daher schon vorgeschlagen, statt des schwieriger zu messenden Feuchtigkeitsgehaltes des Textilguts den Temperaturwechsel zu ermitteln und aus diesem Rückschlüsse auf den Feuchtigkeitsgehalt des Textilguts zu ziehen. Es wurde daher angeregt, stetig die Temperatur des Textilguts direkt, aber kontaktlos mittels Temperaturfühlern zu messen.In order to set an optimal treatment speed, which determines, for example, the ratio of dry treatment time: fixing treatment time, it is necessary to determine the point from the treatment section at which the textile wicks up the critical residual moisture. Because of the temperature rise that begins at this point, it has therefore already been proposed to determine the temperature change instead of the more difficult to measure moisture content of the textile material and to draw conclusions from this about the moisture content of the textile material. It was therefore suggested to constantly measure the temperature of the textile goods directly, but without contact, using temperature sensors.

Um den Temperaturverlauf über die Länge einer Behandlungsstrecke möglichst genau zu ermitteln, müssen Temperaturfühler in entspreched dichter Folge entlang der Behandlungsstrecke vorqesehen werden. Kontaktlos arbeitende Temperaturfühler, wie Strahlungspyrometer, sind aber sehr aufwendig. Ihre Verwendung zur Ermittlung des Temperaturprofils über die Behandlungsstrecke ermöglicht zwar eine Optimierung der Warenbahngeschwindigkeit und damit eine Energieeinsparung, der dazu erforderliche Investitionsaufwand hebt aber den Betriebskostenvorteil zu einem wesentlichen Teil wieder auf. Kostengünstige kontaktfrei arbeitende Temperaturmeßgeräte sind zwar auch bekannt (vgl. "Textilbetrieb" April 1981, S. 55), müssen aber innerhalb einer nur wenige Millimeter dicken Grenzschicht angeordnet werden, so daß Berührungen der Meßgeräte mit der Warenbahn nicht auszuschließen sind und Markierungen auf der Warenbahn entstehen können.In order to determine the temperature profile over the length of a treatment section as precisely as possible, temperature sensors must be provided in a correspondingly dense sequence along the treatment section. Contactless temperature sensors such as radiation pyrometers are very expensive. Their use to determine the temperature profile over the treatment line allows an optimization of the web speed and thus an energy saving, but the investment required to do so largely removes the operating cost advantage. Inexpensive non-contact temperature measuring devices are also known (cf. "Textile Company" April 1981, p. 55), but only have a few Millimeter-thick boundary layer can be arranged so that contact of the measuring devices with the web cannot be excluded and markings can occur on the web.

Aus der DE-OS 31 48 576 ist ein Verfahren zur Kontrolle der kontinuierlichen Wärmebehandlung einer textilen Warenbahn bekannt, welches ein in der.Industriepraxis genügend genaues Meßergebnis liefern, die Steuerung und/ oder Regelung der jeweiligen Parameter aufgrund des Meßergebnisses erlauben und mit einem Aufwand zu erstellen sowie zu betreiben sein soll, der durch die Ersparnis an Energie und Produktionszeit voll ausgewogen werden soll. Zur Kontrolle der kontinuierlichen konvektiven Wärmebehandlung einer textilen Warenbahn bei stetiger berührungsloser Messung der Temperatur der Bahn wird dazu vorgeschlagen, so zu verfahren, daß bei einer Anströmung und/ oder Durchströmung der Bahn mit erhitzter Luft etwa parallel und/oder quer zum Bahnförderweg die der Temperatur der Warenbahn proportionale, an die Bahn abgegebene Wärmemenge als Funktion der Differenz der Temperatur der auf die Bahn auftreffenden Luft und der Temperatur der an der Bahn reflektierten bzw. durch die Bahn geströmten Luft gemessen wird.From DE-OS 31 48 576 a method for controlling the continuous heat treatment of a textile web is known which provides a sufficiently accurate measurement result in industrial practice, which allows the control and / or regulation of the respective parameters on the basis of the measurement result and at a cost should be created and operated, which should be fully balanced by the savings in energy and production time. To control the continuous convective heat treatment of a textile web with constant non-contact measurement of the temperature of the web, it is proposed to proceed in such a way that when the air is heated and / or flowed through the web with heated air approximately parallel and / or transversely to the web conveying path, the temperature of the web Material web proportional heat quantity emitted to the web is measured as a function of the difference between the temperature of the air hitting the web and the temperature of the air reflected from the web or flowing through the web.

Nach diesem bekannten Verfahren wird somit die von dem erhitzten Behandlungsmedium an die Warenbahn abgegebene Wärmemenge, die der Differenz der Temperatur des ankommenden Behandlungsmediums und der Temperatur der Ware proportional ist, als Funktion der Differenz der Temperatur des ankommenden Behandlungsmediums und der Temperatur des reflektierten oder durchströmten Behandlungsmediums bestimmt. Bei Messungen an mehreren aufeinanderfolgenden Stellen auf der Behandlungsstrecke des zuströmenden und des abströmenden Behandlungsmediums liefert dieses Meßverfahren ein der Warenbahntemperatur entsprechendes Temperaturprofil.According to this known method, the amount of heat given off by the heated treatment medium to the product web, which is proportional to the difference between the temperature of the incoming treatment medium and the temperature of the product, is a function of the difference in temperature of the incoming treatment medium and the temperature of the reflected or flowed through treatment medium. When measuring at several successive points on the treatment path of the inflowing and outflowing treatment medium, this measuring method delivers a temperature profile corresponding to the web temperature.

Der Erfindung liegt die Aufgabe zugrunde, bei der Wärmebehandlung von Textilgut die Behandlungsdauer zu optimieren und dazu gleichfalls das Temperaturprofil des Textilguts über die Behandlungssstrecke zu ermitteln, jedoch ohne daß dazu die jeweilige Temperatur des Textilguts unmittelbar oder die Temperaturen des jeweils zu- und abströmenden Behandlungsmediums gemessen werden müssen.The invention has for its object to optimize the duration of treatment in the heat treatment of textile goods and also to determine the temperature profile of the textile goods over the treatment line, but without measuring the respective temperature of the textile goods directly or the temperatures of the inflowing and outflowing treatment medium Need to become.

Ausgehend von einer Wärmebehandlung von Textilgut, das von mehreren, im wesentlichen im Kreislauf geführten, gasförmigen Behandlungsmedienströmen beaufschlagt wird, wobei die für jeden Strom des Behändlungsmediums pro Zeiteinheit aufgewendete Energiemenge gemessen wird und eine Veränderung dieser Energiemenge entsprechend der Solltemperatur im betreffenden Feld des Spannrahmens erfolgt, wird zur Lösung der gestellten Aufgabe erfindungsgemäß vorgeschlagen, so zu verfahren, daß in Abhängigkeit von der Stelle auf der Behandlungsstrecke, an welcher die maximale Abweichung in der pro Zeiteinheit aufgewendeten Energiemenge für zwei Ströme aufeinanderfolgender Behandlungsstreckenteile auftritt, die Marenbahngeschwindigkeit geregelt wird.Starting from a heat treatment of textile material, which is acted upon by several, essentially circulating, gaseous treatment medium streams, the amount of energy expended per unit time for each stream of the treatment medium being measured and a change of this amount of energy taking place according to the target temperature in the relevant field of the tenter, To solve the problem, the invention proposes to proceed in such a way that the Marenbahn speed is regulated as a function of the point on the treatment line at which the maximum deviation in the amount of energy expended per unit of time for two streams of successive treatment line parts occurs.

Nach einer besonders vorteilhaften Ausgestaltung der Erfindung kann so verfahren werden, daß den Feldern eines Spannrahmens zunächst im Leerlaufbetrieb aufgeheiztes Behandlungsmedium zugeleitet wird und die pro Zeiteinheit erforderliche Energiemenge für jeden Strom zur Aufrechterhaltung der Solltemperatur in den Feldern gemessen wird. Daraufhin wird die zu behandelnde Warenbahn in den Spannrahmen eingeführt und sodann die zur Aufrechterhaltung der Solltemperatur in jedem Feld pro Zeiteinheit erforderliche Energiemenge gleichfalls gemessen. Sodann wird die Differenz der beiden Energiemengen eines jeden Stromes ermittelt und schließlich in Abhängigkeit von der Stelle der Behandlungsstrecke, an welcher die maximale Abweichung der ermittelten Differenzwerte der Energiemengen für die Ströme aufeinanderfolgender Felder auftritt, die Warenbahngeschwindigkeit geregelt.According to a particularly advantageous embodiment of the invention, the procedure can be such that the fields of a tenter frame are first supplied with heated treatment medium in idle mode and the amount of energy required per unit of time for each current to maintain the target temperature in the fields is measured. The material web to be treated is then introduced into the stenter and then the amount of energy required to maintain the target temperature in each field per unit of time is also measured. Then the difference between the two amounts of energy of each stream is determined and finally, depending on the location of the treatment section at which the maximum deviation of the determined difference values of the amounts of energy for the streams of successive fields occurs, the web speed is regulated.

Zur Trocken- und unmittelbar anschließenden Fixierbehandlung einer Warenbahn kann erfindungsgemäß so verfahren werden, daß Werte der pro Zeiteinheit aufgewendeten Energiemengen einem Rechner zugeleitet werden, der die Stelle der Behandlungsstrecke der maximalen Wertabweichung in Vergleich setzt mit einer Sollstelle der Behandlungsstrecke, worauf die Warenbahngeschwindigkeit entsprechend korrigiert wird, um eine vorgegebene Trocken- und ebenso eine vorgegebene Fixierdauer einzuhalten.For the dry and immediately subsequent fixing treatment of a web, the method according to the invention can be used in such a way that values of the amounts of energy expended per unit of time are fed to a computer which compares the location of the treatment line with the maximum value deviation with a target location of the treatment line, whereupon the web speed is corrected accordingly in order to adhere to a predefined drying time and also a predefined fixing period.

Das erfindungsgemäße Verfahren macht sich die Erkenntnis zunutze, daß die zugeführten Wärmemengen beispielsweise dem Öffnungsgrad von Ventilen der Behandlungsmedienströme proportional sind. Die Ventilstellungen lassen sich in an sich bekannter Weise elektrisch abgreifen und beispielsweise durch Leuchtdioden anzeigen.The method according to the invention takes advantage of the knowledge that the amounts of heat supplied, for example, the degree of opening of valves of the treatment medium streams are proportional. The valve positions can be tapped electrically in a manner known per se and displayed, for example, by means of light-emitting diodes.

Um den Übergangspunkt zwischen der Trockenbehandlung und der Fixierbehandlung deutlich zu machen, kann zunächst der Spannrahmen aufgeheizt werden. Nach Erreichen der Temperatur stellt sich ein bestimmter Märmeverbrauch ein bei ebenso bestimmten Ventilstellungen. Die sich daraus ergebenden Meßwerte können gegen Null getrimmt werden. Auf diese Weise ist die Leerlaufleistung des Spannrahmens, also der Anteil,der aus maschinenbedingten Verlusten resultiert, eliminierbar. Nachdem die Warenbahn in den Spannrahmen eingefahren ist, ergeben sich neue Meßwerte, die allein dem Anteil zum Aufheizen der Warenbahn und zum Verdampfen des Wassers entsprechen. Auf diese Weise läßt sich der Übergangspunkt auf der Behandlungsstrecke zwischen der Trockenbehandlung und der Fixierbehandlung anzeigen.In order to make the transition point between the dry treatment and the fixing treatment clear, the stenter can first be heated. After the temperature has been reached, a certain amount of Märme consumption occurs with the valve positions also determined. The resulting measurement values can be trimmed to zero. In this way, the idle power of the stenter, that is, the portion that results from machine-related losses, can be eliminated. After the material web has been run into the stenter, new measured values result which only correspond to the portion for heating the material web and for evaporating the water. In this way, the transition point on the treatment line between the dry treatment and the fixing treatment can be displayed.

Ein Spannrahmen aus mehreren Trocken- und Fixierfeldern mit je einem einen Strom eines gasförmigen Behandlungsmediums im Kreislauf umwälzenden Ventilator und einer den Strom auf Behandlungstemperatur haltenden Heizeinrichtung zur Durchführung des erfindungsgemäßen Verfahrens ist vorzugsweise so ausgerüstet, daß im Kreislauf des Behandlungsmediums die Sonde eines Thermometers angeordnet ist, das mit einem Heizregler in Verbindung steht, an dem ein die pro Zeiteinheit der Heizeinrichtung zufließende Energiemenge veränderndes Ventil angeschlossen ist, dessen jeweilige Stellung erfaßbar ist.A stenter from several drying and fixing fields, each with a fan circulating a stream of a gaseous treatment medium in the circuit and a heating device for maintaining the current at the treatment temperature for carrying out the method according to the invention, is preferably equipped in such a way that the probe of a thermometer is arranged in the circuit of the treatment medium, that in connection with a heating controller is connected to which a valve changing the amount of energy flowing to the heating device is connected, the respective position of which can be detected.

Nach einer Ausgestaltung des erfindungsgemäßen Spannrahmens besteht die Heizeinrichtung aus einem auf der Saugseite des Ventilatorsangeordneten Heizregister oder einem Gas- oder Ülbrenner, wobei die Sonde des Thermometers in Strömungsrichtung hinter der Heizeinrichtung angeordnet ist.According to an embodiment of the clamping frame according to the invention, the heating device consists of a heating register arranged on the suction side of the fan or a gas or oil burner, the probe of the thermometer being arranged behind the heating device in the flow direction.

Zur Erläuterung der Erfindung sind in der Zeichnung ein Ausführungsbeispiel eines Spannrahmens zur Durchführung des Verfahrens sowie über einem Anzeigeinstrument graphische Darstellungen der über die Länge des Spannrahmens (= Behandlungsstrecke) zugeführten unterschiedlichen Energiemengen und ein Gerät zur Steuerung der Warenbahngeschwindigkeit wiedergegeben:

  • Wie der in Fig. 1 schematisch dargestellte Querschnitt durch das Feld eines Spannrahmens zeigt, wird eine Warenbahn 1 in breitgespanntem Zustand zwischen Düsenkästen 2 und 3 geführt und mit einem im wesentlichen im Kreislauf strömenden gasförmigen Behandlungsmedium beaufschlagt.
In order to explain the invention, the drawing shows an exemplary embodiment of a tensioning frame for carrying out the method and, via a display instrument, graphic representations of the different amounts of energy supplied over the length of the tensioning frame (= treatment path) and a device for controlling the web speed:
  • As the cross-section shown schematically in FIG. 1 through the field of a tenter frame, a web 1 is guided in a wide-stretched state between nozzle boxes 2 and 3 and a gaseous treatment medium flowing essentially in the circuit is applied to it.

Ein auf der Saugseite eines Ventilators 4 angeordneter Brenner 5 heizt das Behandlungsmedium auf, dessen Temperaturauf der Druckseite des Ventilators 4 laufend gemessen wird. Über eine Leitung 6 wird die Temperatur einem Heizregler 7 als Istwert aufgegeben, dem zusätzlich über eine Leitung 8 ein Sollwert aufgegeben wird. Über eine Leitung 9 wird ein Heizventil lo in einer Brennstoffzuführleitung 11 gesteuert, über die der Brenner 5 mit einer entsprechenden Brennstoffmenge versorgt wird. Die jeweilige Stellung des Heizventils lo wird durch ein Anzeigeinstrument 12 sichtbar gemacht.A burner 5 arranged on the suction side of a fan 4 heats up the treatment medium, the temperature of which continuously on the pressure side of the fan 4 is measured. Via a line 6, the temperature is given to a heating controller 7 as an actual value, to which a setpoint is additionally given via a line 8. A heating valve 10 in a fuel supply line 11 is controlled via a line 9, via which the burner 5 is supplied with a corresponding amount of fuel. The respective position of the heating valve 10 is made visible by a display instrument 12.

Die Temperatur des Behandlungsmediums wird somit in Strömungsrichtung hinter dem Brenner 5 und vor der Beaufschlagung der Warenbahn 1 gemessen. Der dabei ermittelte Istwert wird im Heizregler 7 mit dem Sollwert, d.h. der eingestellten Temperatur, verglichen. Liegt der Istwert unter dem Sollwert, öffnet der Heizregler 7 das Heizventil lo und schließt dieses wiederum schrittweise, wenn der Istwert größer ist als der Sollwert.The temperature of the treatment medium is thus measured in the flow direction behind the burner 5 and before the material web 1 is loaded. The actual value determined in this way is compared in heating controller 7 with the setpoint, i.e. the set temperature. If the actual value is below the target value, the heating controller 7 opens the heating valve 10 and closes it again step by step if the actual value is greater than the target value.

Der Wärmehaushalt des Spannrahmens stellt sich wie folgt dar:

  • Über den Brenner 5 wird die Heizenergie an das im wesentlichen im Kreislauf geführte Behandlungsmedium abgegeben, wodurch dieses auf die Solltemperatur gebracht wird. Das Behandlungsmedium verliert die Wärmeenergie durch das Aufheizen der Ware, durch das Aufheizen und Verdampfen des in der Ware befindlichen Wassers, durch das Aufheizen der dem Kreislauf zugeführten Frischluft sowie durch Abstrahlungsverluste beispielsweise der Warentransportkette und des Trockenraumes.
The heat balance of the stenter is as follows:
  • Via the burner 5, the heating energy is given off to the treatment medium which is essentially circulated, whereby this is brought to the desired temperature. The treatment medium loses the heat energy due to the heating up of the goods, the heating and evaporation of the water in the goods, the heating of the fresh air supplied to the circuit, and radiation losses, for example of the goods transport chain and the drying room.

Da die Temperatur des Behandlungsmediums durch die Wärmeabgabe sinkt, muß sie durch Aufheizung wieder auf Solltemperatur angehoben werden. Einem bestimmten Wärmeverbrauch des Spannrahmens ist somit eine bestimmte Ventilstellung der Heizung zugeordnet.Since the temperature of the treatment medium drops as a result of the heat given off, it must be raised to the desired temperature again by heating. A specific valve position of the heater is thus assigned to a specific heat consumption of the stenter.

Die Wärmebilanz eines Trocken- und Fixierprozesses kann sich dabei beispielsweise wie folgt darstellen:

Figure imgb0001
The heat balance of a drying and fixing process can be represented as follows, for example:
Figure imgb0001

Die Wärmemengen unter a), b) und c) bilden den Leerlaufwärmebedarf des Spannrahmens. Die Wärmemengen unter d) und e) sind die für die Ware aufzubringenden Mengen. Daraus wird ersichtlich, daß der Trockenprozeß ein Vielfaches der Wärmeenergie des Fixierprozesses benötigt.The heat quantities under a), b) and c) form the idle heat requirement of the stenter. The heat quantities under d) and e) are the quantities to be applied for the goods. From this it can be seen that the drying process requires a multiple of the thermal energy of the fixing process.

Da jedes Spannrahmenfeld mit einem Heizventil und einem die Ventilstellung sichtbar machenden Anzeigeinstrument versehen ist, läßt sich auch das Absinken des Verbrauchs an Heizenergie über die Länge der Behandlungsstrecke von einer Meßstelle zur nächsten bestimmen, wodurch die Stelle auf der Behandlungsstrecke angezeigt wird, wo der Trockenprozeß beendet ist und der Fixierprozeß beginnt.Since each stenter frame is provided with a heating valve and a display instrument which makes the valve position visible, the decrease in the consumption of heating energy can be determined over the length of the treatment section from one measuring point to the next, which indicates the point on the treatment section where the drying process ends is and the fixing process begins.

Wie die Fig. 2 bis 4 zeigen, symbolisiert ein Anzeigeinstrument 13 die Länge eines schematisch dargestellten Spannrahmens 14 aus sieben über die Behandlungsstrecke hintereinander angeordneten Feldern 15.As shown in FIGS. 2 to 4, a display instrument 13 symbolizes the length of a schematically illustrated clamping frame 14 from seven fields 15 arranged one behind the other over the treatment path.

Um die Trocken- und Fixierbehandlung bei einer optimalen Warenbahngeschwindigkeit durchführen zu können, soll die Übergangsstelle zwischen Trocken- und Fixierbehandlung im Spannrahmen 14 dort liegen, wo dieser durch eine Linie 16 geschnitten wird.In order to be able to carry out the drying and fixing treatment at an optimal web speed, the transition point between drying and fixing treatment should lie in the tenter 14 where this is cut by a line 16.

In Fig. 2 gibt das Anzeigeinstrument 13 zu erkennen, daß sich aus der gewählten Uarenbahngeschwindigkeit eine zu kurze Fixierstrecke 17 ergibt, der eine zu lang bemessene Trockenstrecke 18 vorausgeht. Demgegenüber veranschaulicht Fig. 3 eine zu lang bemessene Fixierstrecke 17 und eine zu kurz bemessene Trockenstrecke 18. In Fig. 4 sind dagegen die Fixierstrecke 17 und die Trockenstrecke 18 so aufeinander abgestimmt, daß ihr Übergang durch die Linie 16 bestimmt wird. Nur in diesem Beispiel ist die Warenbahngeschwindigkeit optimal, so daß die Trockenbehandlungsdauer wie auch die Fixierbehandlungsdauer so kurz wie möglich, aber auch so lang wie nötig ist.In Fig. 2, the display instrument 13 shows that a too short fixing section 17 results from the selected Uarenbahn speed, which is preceded by a drying section 18 which is too long. In contrast, FIG. 3 illustrates a fixing section 17 that is too long and a drying section 18 that is too short. In FIG. 4, on the other hand, the fixing section 17 and the drying section 18 are coordinated with one another in such a way that their transition through line 16 is determined. Only in this example is that Web speed optimal, so that the dry treatment time as well as the fixing treatment time is as short as possible, but also as long as necessary.

Claims (5)

1. Verfahren zur Wärmebehandlung von Textilgut, insbesondere zur Trocken- und Fixierbehandlung einer durch einen aus mehreren Feldern bestehenden Spannrahmen geführten Warenbahn, die in jedem Feld mit einem Strom eines im wesentlichen im Kreislauf geführten gasförmigen Behandlungsmediums beaufschlagt wird, wobei die für jeden Strom des Behandlungsmediums pro Zeiteinheit aufgewendete Energiemenge gemessen wird und eine Veränderung dieser Energiemenge entsprechend der Solltemperatur im betreffenden Feld des Spannrahmens erfolgt, dadurch gekennzeichnet, daß in Abhängigkeit von der Stelle auf der Behandlungsstrecke, an welcher die maximale Abweichung in der pro Zeiteinheit aufgewendeten Energiemenge für zwei Ströme aufeinanderfolgender Felder auftritt, die Warenbahngeschwindigkeit geregelt wird.1. A method for the heat treatment of textile goods, in particular for the drying and fixing treatment of a web guided by a tenter frame consisting of several fields, which is acted upon in each field with a stream of a gaseous treatment medium which is essentially circulated, the for each stream of the treatment medium the amount of energy expended per unit of time is measured and this amount of energy changes in accordance with the target temperature in the relevant field of the stenter frame, characterized in that, depending on the point on the treatment path at which the maximum deviation in the amount of energy expended per unit of time for two streams of successive fields occurs, the web speed is regulated. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß den Feldern des Spannrahmens zunächst im Leerlaufbetrieb aufgeheiztes Behandlungsmedium zugeleitet wird und die pro Zeiteinheit erforderliche Energiemenge für jeden Strom zur Aufrechterhaltung der Solltemperatur in den Feldern gemessen wird, worauf die zu behandelnde Warenbahn in den Spannrahmen eingeführt wird und die daraufhin zur Aufrechterhaltung der Solltemperatur in jedem Feld pro Zeiteinheit erforderliche Energiemenge gleichfalls gemessen und die Differenz der beiden Energiemengen eines jeden Stromes ermittelt wird, und daß schließlich in Abhängigkeit von der Stelle der Behandlungsstrecke, an welcher die maximale Abweichung der ermittelten Differenzwerte der Energiemengen für die Ströme aufeinanderfolgender Felder auftritt, die Warenbahngeschwindigkeit geregelt wird.2. The method according to claim 1, characterized in that the fields of the tenter is first supplied in idle heated treatment medium and the amount of energy required per unit of time for each current is measured to maintain the target temperature in the fields, whereupon the fabric to be treated is introduced into the tenter is and the amount of energy required to maintain the target temperature in each field per unit of time is also measured and the difference between the two amounts of energy of each current is determined, and finally depending on the location of the treatment line at which the maximum deviation of the determined difference values of the amounts of energy for the streams of successive fields occurs, the web speed is regulated. 3. Verfahren zur Trocken- und unmittelbar anschließenden Fixierbehandlung einer Warenbahn nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß Werte der pro Zeiteinheit aufgewendeten Energiemengen einem Rechner zugeleitet werden, der die Stelle der Behandlungsstrecke der maximalen Wertabweichung in Vergleich setzt mit einer Sollstelle der Behandlungsstrecke und die Warenbahngeschwindigkeit entsprechend korrigiert, um eine vorgegebene Trocken- und Fixierdauer einzuhalten.3. The method for dry and immediately subsequent fixing treatment of a web according to claims 1 and 2, characterized in that values of the amounts of energy expended per unit of time are fed to a computer which compares the location of the treatment line with the maximum value deviation with a target location of the treatment line and corrects the web speed accordingly in order to maintain a predetermined drying and fixing time. 4. Spannrahmen aus mehreren Trocken- und Fixierfeldern mit je einem einen Strom eines gasförmigen Behandlungsmediums im Kreislauf umwälzenden Ventilator und einer den Strom auf Behandlungstemperatur haltenden Heizeinrichtung, dadurch gekennzeichnet, daß im Kreislauf des Behandlungsmediums die Sonde eines Thermometers angeordnet ist, das mit einem Heizregler (7) in Verbindung steht, an dem ein die pro Zeiteinheit der Heizeinrichtung (7) zufließende Energiemenge veränderndes Ventil (lo) angeschlossen ist, dessen jeweilige Stellung erfaßbar ist.4.Tenter frame consisting of several drying and fixing fields, each with a fan circulating a stream of a gaseous treatment medium in the circuit and a heating device keeping the current at the treatment temperature, characterized in that the probe of a thermometer is arranged in the circuit of the treatment medium and is equipped with a heating controller ( 7) is connected to which a valve (lo) changing the amount of energy flowing in per unit time of the heating device (7) is connected, the respective position of which can be detected. 5. Spannrahmen nach Anspruch 4, dadurch gekennzeichnet, daß die Heizeinrichtung (7) aus einem auf der Saugseite des Ventilators (4) angeordneten Heizregister oder einem Gas- oder Ölbrenner besteht und die Sonde des Thermometers in Strömungsrichtung hinter der Heizeinrichtung (7) angeordnet ist.5. stenter according to claim 4, characterized in that the heating device (7) consists of a heating register arranged on the suction side of the fan (4) or a gas or oil burner and the probe of the thermometer is arranged in the flow direction behind the heating device (7) .
EP84107770A 1983-08-08 1984-07-04 Process for a drying and an immediately following fixing treatment of a running web material and tenter for carrying out the process Expired EP0139852B1 (en)

Priority Applications (1)

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AT84107770T ATE32538T1 (en) 1983-08-08 1984-07-04 PROCESS FOR THE DRYING AND IMMEDIATELY FOLLOWING FIXING TREATMENT OF A TEXTILE WEB AND TENTERING FRAME FOR PERFORMING THE PROCESS.

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DE3328557 1983-08-08
DE3328557A DE3328557A1 (en) 1983-08-08 1983-08-08 METHOD FOR HEAT TREATING TEXTILE MATERIALS AND TENSIONING FRAME FOR CARRYING OUT THE METHOD

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EP0139852A1 true EP0139852A1 (en) 1985-05-08
EP0139852B1 EP0139852B1 (en) 1988-02-17

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WO2003029546A1 (en) * 2001-09-28 2003-04-10 Devendra Somabhai Naik A stenter machine

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DE3608902A1 (en) * 1986-03-17 1987-09-24 Brueckner Trockentechnik Gmbh METHOD FOR THE HEAT TREATMENT OF A MATERIAL IN A TENSING MACHINE
DE3710202A1 (en) * 1987-03-27 1988-10-06 Brueckner Trockentechnik Gmbh Regulating method for operating a tentering machine for heat treatment of textile fabric webs
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US4656756A (en) 1987-04-14
DE3469382D1 (en) 1988-03-24
DE3328557A1 (en) 1985-02-28
ES8601352A1 (en) 1985-11-01
EP0139852B1 (en) 1988-02-17
ES534776A0 (en) 1985-11-01
ATE32538T1 (en) 1988-03-15
DE3328557C2 (en) 1989-12-14

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