EP0137067A1 - Process and apparatus for drying yarn or fibre packages - Google Patents
Process and apparatus for drying yarn or fibre packages Download PDFInfo
- Publication number
- EP0137067A1 EP0137067A1 EP83110084A EP83110084A EP0137067A1 EP 0137067 A1 EP0137067 A1 EP 0137067A1 EP 83110084 A EP83110084 A EP 83110084A EP 83110084 A EP83110084 A EP 83110084A EP 0137067 A1 EP0137067 A1 EP 0137067A1
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- Prior art keywords
- yarns
- fibers
- drying
- process step
- flaps
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000001035 drying Methods 0.000 title claims abstract description 29
- 239000000835 fiber Substances 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002274 desiccant Substances 0.000 claims abstract 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 12
- 238000009835 boiling Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/006—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects the gas supply or exhaust being effected through hollow spaces or cores in the materials or objects, e.g. tubes, pipes, bottles
- F26B21/007—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects the gas supply or exhaust being effected through hollow spaces or cores in the materials or objects, e.g. tubes, pipes, bottles the objects being bobbin- or spool-like bodies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
Definitions
- the invention relates to a process for drying wound fibers or yarns with two kettles to be used alternately for the same treatment process, the fibers or yarns being heated in a first process step with an almost moisture-saturated, hot gas serving as heat transfer medium and in a second process step under vacuum are dried and these process steps are repeated alternately in the two kettles until the final drying.
- the invention further relates to an apparatus for performing this method.
- Such a method and a device suitable for carrying it out are known, for example, from DE-PS 21 09 696.
- This drying process takes place in such a way that first the circulating gas serving as heat transfer medium during the heating process zesses for heating the fibers or yarns to, for example, 30 to 60 ° C and in order to reduce the drying power of the gas is constantly moistened and so strongly that the partial vapor pressure is approximately equal to the partial vapor pressure of the gas boundary layer on the capillary surface of the material to be dried, which in turn is of the Temperature of the material to be dried depends on the steam curve. This results in intensive heating of the textile goods and at the same time prevents drying.
- the boiler is then evacuated so that, due to the lowering of the boiling point, the water stored in the fibers or yarns evaporates and is sucked off with the vacuum pump.
- This process i.e. the alternating heating with moist, hot gas and the subsequent drying under vacuum is repeated until the fibers or yarns have dried sufficiently.
- the known drying device consists of two boilers in which the two processes take place alternately. Both boilers are first connected to the humidification and heating device, then to the vacuum and drying device via changeover valves. In this way, with a single machine off Equipment: heater, blower and evacuation device including condenser, two drying processes in two boilers are carried out at the same time, since whenever the blower and heater are in the circuit of the first boiler, the other boiler is connected to the evacuation device.
- the present invention is therefore based on the object of improving the method described at the outset in such a way that the moisture stored in the deeper layers of the yarns or fibers can also be better removed, so that the drying process is shortened overall.
- This object is achieved in that during the first process step the moisture content of the gas is reduced in accordance with the moisture content of the fibers or yarns, that the duration of the second process step is shortened and that in a third process step at an intermediate pressure in the boiler the rest moisture is transported to the surface of the fibers or yarns with a warm, dry gas flow.
- the warm, dry gas flow can be supplied intermittently. This is particularly advantageous if the performance of the vacuum pump is limited.
- the main advantage of the method according to the invention lies in the fact that the moisture stored in the deeper layers of the yarns or fibers no longer reaches the surface only due to the diffusion, but is conveyed to the outside with the aid of the gas flow, but at the same time the advantages of vacuum drying , namely the reduction of the boiling point and the resulting protection of the material, are retained.
- the sum of the duration of the second and third process steps which take place in one boiler is chosen to be as long as the duration of the first process step which takes place in the other boiler, the result is a considerable reduction in the until the fibers or yarns are completely dry, thereby reducing the total treatment time.
- Another object of the present invention is to provide a device which, starting from the device described in the introduction, provides a faultless, trouble-free, time-shortened Operational flow enables, without the need for expensive additional units.
- control elements consisting of blower, humidifier and heater
- a controllable bypass is arranged parallel to the control elements.
- the cooler is a heat exchanger.
- a high-frequency heater can be arranged in the boiler to support the drying process, in particular under vacuum or full vacuum.
- Dried material for example in the form of coils 2, 2a, is used in each of the two boilers 1, 1a.
- the boilers 1, 1a are connected to heating circuits 3, 3a and to evacuation lines 12, 12a.
- the two heating circuits 3, 3a can alternatively be connected via switch flaps 13, 13a to a two common part with blower 4, heater 5, compressed air source 8 and humidifier 18. Saturated steam is generally used to humidify the drying gas.
- the evacuation lines-12, 12a are via vacuum flaps pen 11, 11a connected to an evacuation device 16 with an upstream capacitor 15.
- ventilation and venting valves 10, 10a are provided on the boilers 1, 1a. With the help of the switching elements 14, 14a used, a switchover can take place such that the yarn packages 2, 2a are preferably dried on the outside or on the inside.
- Controllable bypass lines 9, 9a are located parallel to the upper switching flaps 13, 13a. With the help of these bypass lines 9, 9a, part of the heated gas flow can be branched out of the heating circuit and fed to the currently evacuated boiler 1a.
- the drying process according to the invention proceeds as follows using the device shown. After the wet yarn packages 2, 2a coming from the dyeing plant have been inserted into the boilers 1, 1a, they are first mechanically dewatered with compressed air and then heated with moist, warm gas. For this purpose, the blower 4 pushes the drying gas, generally air, through the heater 5, where it is heated and optionally humidified by the supply of steam in the humidifier 18. This moist hot gas flows through the boiler 1a and the yarn spool 2a in a circuit in the position of the switching flaps 13, 13a shown. If the gas is too hot or too heavily loaded with moisture, it can be cooled in the cooler 6 and the water which separates out can be removed from the water separator 7. This cooling and dehumidification of the drying gas takes place in accordance with the degree of drying of the fibers or yarns 2, 2a.
- Such a heating cycle takes six minutes, for example. It is carried out with practically moisture-saturated air at approx. 125 ° C, e.g. if dyed cotton or polyester can be treated. Due to the rather short cycle times, despite the high gas temperature, the textile goods only become harmless temperatures, e.g. max. 85 ° C.
- the vacuum flaps 11, 11a are in the position shown, i.e. the boiler 1 is switched to vacuum.
- the switching flaps 13, 13a and the vacuum flaps 11, 11a are switched over, so that the yarns 2 in the left boiler 1 are now heated and the yarns 2a in the right boiler 1a are evacuated and dried.
- the bypass 9, 9a can remain open during the third process step. However, if the vacuum pump 16 has only a relatively low performance, it is advisable to alternately open and close the bypass 9 so that the pressure in the boiler 1, 1a repeatedly drops to the desired intermediate value.
- a high-frequency drying device 17, 17 a can be arranged in the boilers 1, 1 a to support the drying, in particular during the second and third process step.
- the arrangement of the cooler 6 and the water separator 7 has yet another advantage. It is possible, for example, to supply cooling water, which is supplied to the vacuum condenser 15 at approx. 10 ° C. and leaves it at approx. 35 ° C., directly to the cooler 6 in order to cool and dehumidify the drying and heating gas. At the outlet of the cooler 6, this water can be taken off at a temperature of approximately 60 ° C. This heated water can then be used as process water, for example in a connected dyeing plant.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Eine Vorrichtung zum Trocknen von Fasern oder Garnen (2, 2a) besitzt zwei wechselweise für denselben Behandlungsvorgang zu verwendende Kessel (1, 1a), die durch parallele Leitungen (12, 12a) über Vakuumklappen (11, 11a) und einen einzigen Kondesator (15) an eine gemeinsame Evakuierungsvorrichtung (16) angeschlossen sind. Die Trocknungsmittelkreisläufe (3, 3a) weisen ein gemeinsames, beide Kreisläufe (3, 3a) verbindendes, zwischen Umschaltklappen (13, 13a) eingesetztes Teil mit Gebläse (4), Erhitzer (5), Befeuchter (18), Kühler (6) und Wasserabscheider (7) auf. Parallel zu den Umschaltklappen (13, 13a) ist ein steuerbarer Bypaß (9, 9a) angeordnet, mit dessen Hilfe eine Teil des Trocknungsgases in den evakuierten Kessel (1, 1a) geleitet werden kann. In den Kesseln (1, 1a) zusätzlich angeordnete Hochfrequenz-Erwärmer (17, 17a) dienen zur zusätzlichen Aufheizung der Fasern oder Garne (2, 2a).A device for drying fibers or yarns (2, 2a) has two kettles (1, 1a) to be used alternately for the same treatment process, which are connected by parallel lines (12, 12a) via vacuum flaps (11, 11a) and a single condenser (15 ) are connected to a common evacuation device (16). The drying agent circuits (3, 3a) have a common part, which connects both circuits (3, 3a) and is used between the switching flaps (13, 13a), with a fan (4), heater (5), humidifier (18), cooler (6) and Water separator (7). A controllable bypass (9, 9a) is arranged parallel to the changeover flaps (13, 13a), by means of which part of the drying gas can be passed into the evacuated boiler (1, 1a). High-frequency heaters (17, 17a) additionally arranged in the boilers (1, 1a) serve to additionally heat the fibers or yarns (2, 2a).
Description
Die Erfindung betrifft ein Verfahren zum Trocknen von aufgespulten Fasern oder Garnen mit zwei wechselweise für denselben Behandlungsvorgang zu verwendenden Kesseln, wobei die Fasern oder Garne in einem ersten Verfahrensschritt mit einem als Wärmeträger dienenden, nahezu feuchtigkeitsgesättigten, heißen Gas aufgeheizt und in einem zweiten Verfahrensschritt unter Vakuum getrocknet werden und diese Verfahrensschritte in den beiden Kesseln abwechselnd bis zur endgültigen Trocknung wiederholt werden. Die Erfindung betrifft ferner eine Vorrichtung zur Durchführung dieses Verfahrens.The invention relates to a process for drying wound fibers or yarns with two kettles to be used alternately for the same treatment process, the fibers or yarns being heated in a first process step with an almost moisture-saturated, hot gas serving as heat transfer medium and in a second process step under vacuum are dried and these process steps are repeated alternately in the two kettles until the final drying. The invention further relates to an apparatus for performing this method.
Ein derartiges Verfahren sowie eine zu seiner Durchführung geeeignete Vorrichtung ist beispielsweise bekannt aus der DE-PS 21 09 696.Dieses Trocknungsverfahren vollzieht sich dergestalt, daß zunächst das als Wärmeträger dienende, zirkulierende Gas während des Erwärmungsprozesses zur Aufheizung der Fasern oder Garne auf zum Beispiel 30 bis 60° C und zwecks Herabsetzung der Trockenkraft des Gases ständig angefeuchtet wird und zwar so stark, daß der Partialdampfdruck ungefähr gleich dem Partialdampfdruck der Gasgrenzschicht an der Kapilaroberfläche des Trocknungsgutes ist, der seinerseits von der Temperatur des Trocknungsgutes entsprechend der Dampfkurve abhängt. Dadurch wird eine intensive Erwärmung des Textilgutes erreicht und gleichzeitig die Trocknung unterbunden. Anschließend wird der Kessel evakuiert, so daß infolge der Herabsetzung des Siedepunktes das in den Fasern oder Garnen gespeicherte Wasser verdampft und mit der Vakuumpumpe abgesaugt wird.Such a method and a device suitable for carrying it out are known, for example, from DE-PS 21 09 696. This drying process takes place in such a way that first the circulating gas serving as heat transfer medium during the heating process zesses for heating the fibers or yarns to, for example, 30 to 60 ° C and in order to reduce the drying power of the gas is constantly moistened and so strongly that the partial vapor pressure is approximately equal to the partial vapor pressure of the gas boundary layer on the capillary surface of the material to be dried, which in turn is of the Temperature of the material to be dried depends on the steam curve. This results in intensive heating of the textile goods and at the same time prevents drying. The boiler is then evacuated so that, due to the lowering of the boiling point, the water stored in the fibers or yarns evaporates and is sucked off with the vacuum pump.
Dieser Vorgang, d.h. das abwechselnde Aufheizen mit feuchtem, heißem Gas und das anschließende.Trocknen unter Vakuum wird so lange wiederholt, bis die Fasern oder Garne ausreichend getrocknet sind.This process, i.e. the alternating heating with moist, hot gas and the subsequent drying under vacuum is repeated until the fibers or yarns have dried sufficiently.
Die Verwendung von feuchtem, heißem Gas zum Aufheizen der Fasern oder Garne ist unbedingte Voraussetzung für eine schonende Behandlung derselben. Bei Verwendung von heißem, trockenem Gas könnte zwar die Trockenzeit reduziert werden; allerdings müßte dann mit irreparablen Schäden an den Fasern oder Garnen durch übertrocknung gerechnet werden.The use of moist, hot gas to heat up the fibers or yarns is an essential prerequisite for gentle treatment of the same. When using hot, dry gas, the drying time could be reduced; however, irreparable damage to the fibers or yarns due to overdrying would then have to be expected.
Da Aufheizen und Vakuumtrocknen wie erwähnt wechselweise vorgenommen werden, besteht die bekannte Trockenvorrichtung aus zwei Kesseln, in denen die beiden Vorgänge alternierend ablaufen. Beide Kessel.werden über Umschaltventile erst an die Befeuchtungs- und Aufheizvorrichtung, dann an die Vakuum- und Trockenvorrichtung angeschlossen. Auf diese Weise können mit einer einzigen maschinellen Ausstattung: Erhitzer, Gebläse und Evakuierungsvorrichtung samt Kondensator, zwei Trocknungsvorgänge in zwei Kesseln gleichzeitig gefahren werden, da immer dann, wenn Gebläse und Erhitzer im Kreislauf des ersten Kessels liegen, der andere Kessel an die Evakuierungsvorrichtung angeschlossen ist.Since heating and vacuum drying are carried out alternately, as mentioned, the known drying device consists of two boilers in which the two processes take place alternately. Both boilers are first connected to the humidification and heating device, then to the vacuum and drying device via changeover valves. In this way, with a single machine off Equipment: heater, blower and evacuation device including condenser, two drying processes in two boilers are carried out at the same time, since whenever the blower and heater are in the circuit of the first boiler, the other boiler is connected to the evacuation device.
der Praxis hat sich nun herausgestellt, daß der Trocknungsvorgang unter Vakuum relativ schnell zu einem gewissen Stillstand kommt. Dies ist dann der Fall, wenn die an der Oberfläche der aufgespulten Fasern und Garne sich befindende Feuchtigkeit verdampftist. Die in den tieferen Schichten gespeicherte Feuchtigkeit verdampft zwar infolge der Siedepunktherabsetzung, jedoch kann der Dampf nur langsam durch die darüber liegenden Schichten hindurchdiffundieren. Die Versuche haben gezeigt, daß der Trocknungsvorgang schon nach einem Sechstel der gesamten zur Verfügung stehenden Zykluszeit den beschriebenen Stillstand erreicht.In practice, it has now been found that the drying process under vacuum comes to a certain standstill relatively quickly. This is the case when the moisture on the surface of the wound fibers and yarns has evaporated. The moisture stored in the deeper layers evaporates due to the lowering of the boiling point, but the steam can only diffuse slowly through the layers above. The experiments have shown that the drying process reaches the described standstill after only one sixth of the total available cycle time.
Der vorliegenden Erfindung liegt deshalb die Aufgabe zugrunde, das eingangs beschriebene Verfahren dahingehend zu verbessern, daß auch die in den tieferen Schichten der Garne oder Fasern gespeicherte Feuchtigkeit besser abgeführt werden kann, so daß der Trocknungsvorgang insgesamt verkürzt wird.The present invention is therefore based on the object of improving the method described at the outset in such a way that the moisture stored in the deeper layers of the yarns or fibers can also be better removed, so that the drying process is shortened overall.
Diese Aufgabe wird dadurch gelöst,daß während des ersten Verfahrensschrittes der Feuchtigkeitsgehalt des Gases entsprechend dem Feuchtigkeitsgehalt der Fasern oder Garne reduziert wird, daß die Dauer des zweiten Verfahrensschrittes verkürzt wird und daß in einem dritten Verfahrensschritt bei einem Zwischendruck im Kessel die Restfeuchte mit einer warmen, trockenen Gasströmung an die Oberfläche der Fasern oder Garne transportiert wird.This object is achieved in that during the first process step the moisture content of the gas is reduced in accordance with the moisture content of the fibers or yarns, that the duration of the second process step is shortened and that in a third process step at an intermediate pressure in the boiler the rest moisture is transported to the surface of the fibers or yarns with a warm, dry gas flow.
Gemäß einer vorteilhaften Weiterbildung kann die warme, trockene Gasströmung intermittierend zugeführt werden. Dies ist besonders dann von Vorteil, wenn die Leistung der Vakuumpumpe begrenzt ist.According to an advantageous development, the warm, dry gas flow can be supplied intermittently. This is particularly advantageous if the performance of the vacuum pump is limited.
Der wesentliche Vorteil des erfindungsgemäßen Verfahrens liegt darin begründet, daß die in den tieferen Schichten der Garne oder Fasern gespeicherte Feuchtigkeit nicht mehr nur aufgrund der Diffusion an die Oberfläche gelangt, sondern mit Hilfe der Gasströmung nach außen gefördert wird, wobei jedoch gleichzeitig die Vorteile der Vakuumtrocknung, nämlich die Verringerung des Siedepunkts und die dadurch bedingte Schonung des Materials, erhalten bleiben.The main advantage of the method according to the invention lies in the fact that the moisture stored in the deeper layers of the yarns or fibers no longer reaches the surface only due to the diffusion, but is conveyed to the outside with the aid of the gas flow, but at the same time the advantages of vacuum drying , namely the reduction of the boiling point and the resulting protection of the material, are retained.
Wenn gemäß einer weiteren Ausgestaltung der Erfindung die Summe der Dauer von zweitem und drittem Verfahrensschritt, die in dem einen Kessel ablaufen, genau so lange gewählt wird wie die Dauer des ersten Verfahrensschritts, der in dem jeweiligen anderen Kessel abläuft, ergibt sich eine erhebliche Verringerung der bis zur völligen Trocknung der Fasern oder Garne erforderlichen Zyklen und damit gleichzeitig eine Verringerung der gesamten Behandlungsdauer.If, according to a further embodiment of the invention, the sum of the duration of the second and third process steps which take place in one boiler is chosen to be as long as the duration of the first process step which takes place in the other boiler, the result is a considerable reduction in the until the fibers or yarns are completely dry, thereby reducing the total treatment time.
Eine weitere Aufgabe der vorliegenden Erfindung besteht wie schon erwähnt darin, eine Vorrichtung anzugeben, die ausgehend von der eingangs beschriebenen Vorrichtung einen einwandfreien, störungsfreien, zeitlich verkürzten Betriebsablauf ermöglicht, ohne kostspielige Zusatzaggregate zu benötigen.Another object of the present invention, as already mentioned, is to provide a device which, starting from the device described in the introduction, provides a faultless, trouble-free, time-shortened Operational flow enables, without the need for expensive additional units.
Diese Aufgabe wird dadurch gelöst, daß das zwischen den Steuerorganen eingesetzte Teil, bestehend aus Gebläse, Befeuchter und Erhitzer, zusätzlich einen Kühler und einen Wasserabscheider erhält und daß parallel zu den Steuerorganen ein steuerbarer Bypaß angeordnet ist.This object is achieved in that the part used between the control elements, consisting of blower, humidifier and heater, additionally receives a cooler and a water separator and that a controllable bypass is arranged parallel to the control elements.
Gemäß einer vorteilhaften Weiterbildung ist der Kühler ein Wärmetauscher. Außerdem kann zur Unterstützung des Trockenvorgangs insbesondere unter Vakuum oder Vollvakuum ein Hochfrequenz-Erwärmer im Kessel angeordnet sein.According to an advantageous development, the cooler is a heat exchanger. In addition, a high-frequency heater can be arranged in the boiler to support the drying process, in particular under vacuum or full vacuum.
Die Vorteile des erfindungsgemäßen Verfahrens und der zur Ausführung des Verfahrens geeigneten Vorrichtung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels anhand der Zeichnung.The advantages of the method according to the invention and the device suitable for carrying out the method result from the following description of an exemplary embodiment with reference to the drawing.
In jedem der beiden Kessel 1, 1a ist Trocknungsgut, beispielsweise in Form von Spulen 2, 2a eingesetzt. Die Kessel 1, 1a sind an Erwärmungskreisläufe 3, 3a sowie an Evakuierungsleitungen 12, 12a angeschlossen.Dried material, for example in the form of coils 2, 2a, is used in each of the two boilers 1, 1a. The boilers 1, 1a are connected to
Die beiden Erwärmungskreisläufe 3, 3a sind über Umschaltklappen 13, 13a alternativ mit einem beiden gemeinsamen Teil mit Gebläse 4, Erhitzer 5, Druckluftquelle 8 und Befeuchter 18 zu verbinden. Zum Befeuchten des Trocknungsgases dient in aller Regel Sattdampf.The two
Die Evakuierungsleitungen-12, 12a sind über Vakuumklappen 11, 11a mit einer Evakuierungsvorrichtung 16 mit vorgeschaltetem Kondensator 15 verbunden. Schließlich sind an den Kesseln 1, 1a Be- und Entlüftungsventile 10, 10a vorgesehen. Mit Hilfe der eingesetzten Umschaltorgane 14, 14a kann eine Umschaltung dahingehend erfolgen, daß die Garnspulen 2, 2a bevorzugt an der Außenseite oder an der 'Innenseite getrocknet werden.The evacuation lines-12, 12a are via
Parallel zu den oberen Umschaltklappen 13, 13a befinden sich steuerbare Bypaßleitungen 9, 9a. Mit Hilfe dieser Bypaßleitungen 9,9a kann ein Teil der erhitzten Gasströmung aus dem Erwärmungskreislauf abgezweigt und dem momentan evakuierten Kessel 1a zugeführt werden.
Das erfindungsgemäße Trocknungsverfahren läuft unter Anwendung der dargestellten Vorrichtung folgendermaßen ab. Nach dem Einsetzen der aus der Färberei kommenden, nassen Garnspulen 2, 2a in die Kessel 1, 1a wird zunächst mechanisch mit Druckluft entwässert und anschließend mit feuchtem, warmem Gas aufgeheizt. Hierzu drückt das Gebläse 4 das Trocknungsgas, im allgemeinen Luft, durch den Erhitzer 5, wo es erwärmt und gegebenenfalls durch die Zuführung von Dampf im Befeuchter 18 befeuchtet wird. Dieses feuchte heiße Gas durchströmt in der dargestellten Stellung der Umschaltklappen 13, 13a den Kessel 1a und die Garnspule 2a in einem Kreislauf. Falls das Gas zu heiß oder zu stark mit Feuchtigkeit beladen sein sollte, kann es im Kühler 6 abgekühlt und das sich abscheidende Wasser am Wasserabscheider 7 abgenommen werden. Diese Abkühlung und Entfeuchtung des .Trocknungsgases erfolgt entsprechend dem Trocknungsgrad der Fasern oder Garne 2, 2a.The drying process according to the invention proceeds as follows using the device shown. After the wet yarn packages 2, 2a coming from the dyeing plant have been inserted into the boilers 1, 1a, they are first mechanically dewatered with compressed air and then heated with moist, warm gas. For this purpose, the blower 4 pushes the drying gas, generally air, through the
Ein solcher Erwärmungszyklus dauert beispielsweise sechs Minuten. Er wird mit praktisch feuchtigkeitsgesättigter Luft von ca. 125°C durchgeführt, wenn z.B. gefärbte Baumwolle oder Polyester behandelt werden. Infolge der recht kurzen Zykluszeiten wird trotz der hohen Gastemperatur das Textilgut nur unschädliche Temperaturen, z.B. max 85°C, annehmen.Such a heating cycle takes six minutes, for example. It is carried out with practically moisture-saturated air at approx. 125 ° C, e.g. if dyed cotton or polyester can be treated. Due to the rather short cycle times, despite the high gas temperature, the textile goods only become harmless temperatures, e.g. max. 85 ° C.
Gleichzeitig befinden sich die Vakuumklappen 11, 11a in der dargestellten Stellung, d.h. der Kessel 1 ist auf Vakuum geschaltet.At the same time, the
Sobald der Erwärmungszyklus des rechten Kessels 1a beendet ist, werden die Umschaltklappen 13, 13a und die Vakuumklappen 11, 11a umgeschaltet, so daß jetzt die Garne 2 im linken Kessel 1 erhitzt und die Garne 2a im rechten Kessel 1a evakuiert und getrocknet werden.As soon as the heating cycle of the right boiler 1a has ended, the switching
Wie schon erwähnt, hat es sich herausgestellt, daß der Trocknungsvorgang unter Vakuum nach relativ kurzer Zeit fast zum Stillstand kommt, beispielsweise nach etwa einer Minute. Dies ist dadurch bedingt, daß die an der Oberfläche der Garnspule 2 sich befindende Feuchtigkeit abgedampft und daß die in den tieferen Schichten der Garnspule 2 sich befindende Feuchtigkeit erst allmählich an die Oberfläche diffundieren muß. Um diesen Diffusionsvorgang zu beschleunigen, wird nach etwa einer Minute der Bypaß 9 geringfügig geöffnet. Hierdurch strömt ein Teil der warmen Luft in den Kessel 1, worauf sich dort ein Zwischendruck einstellt. Diese trockene warme Gasströmung strömt durch die Garnspule 2 und transportiert dabei die in den tieferen Schichten gespeicherte Feuchtigkeit an die Oberfläche, wo sie infolge der Siedepunktherabsetzung durch die Druckreduzierung verdampft und über die Leitung 12 in den Vakuumkondensator 15 transportiert wird. Die Strömungsrichtung durch die Garnspulen 2, 2a kann mit den Umschaltorganen 14, 14a eingestellt werden, wobei überwiegend die Strömung von außen nach innen gerichtet ist.As already mentioned, it has been found that the drying process under vacuum comes to a standstill after a relatively short time, for example after about a minute. This is due to the fact that the moisture present on the surface of the yarn package 2 evaporates and that the moisture present in the deeper layers of the yarn package 2 only has to diffuse to the surface gradually. In order to accelerate this diffusion process, the bypass 9 is opened slightly after about one minute. As a result, part of the warm air flows into the boiler 1, whereupon an intermediate pressure is established there. This dry, warm gas flow flows through the yarn spool 2 and thereby transports the moisture stored in the deeper layers to the Surface where it evaporates due to the reduction in boiling point due to the pressure reduction and is transported via
Falls die Vakuumpumpe 16 eine hohe Leistungsfähigkeit besitzt, kann der Bypaß 9, 9a während des dritten Verfahrensschrittes ständig offen bleiben. Besitzt die Vakuumpumpe 16 jedoch nur eine relativ geringe Leistungsfähigkeit, empfiehlt es sich, den Bypaß 9 abwechselnd zu öffnen und zu schließen, damit der Druck im Kessel 1, 1a immer wieder auf den gewünschten Zwischenwert absinkt.If the
Zur Unterstützung der Trocknung, insbesondere während des zweiten und dritten Verfahrensschrittes, kann in den Kesseln 1, 1a eine Hochfrequenz-Trocknungseinrichtung 17,17a angeordnet werden.A high-
Die Anordnung des Kühlers 6 und des Wasserabscheiders 7 bringt noch einen weiteren Vorteil mit sich. Es ist beispielsweise möglich, Kühlwasser, das dem Vakuumkondensator 15 mit ca. 10°C zugeführt wird und diesen mit ca. 35°C verläßt, unmittelbar dem Kühler 6 zuzuführen, um das Trocknungs- und Erwärmungsgas abzukühlen und zu entfeuchten. Am Ausgang des Kühlers 6 kann dieses Wasser mit einer Temperatur von ca. 60°C abgenommen werden. Dieses aufgeheizte Wasser kann dann als Prozeßwasser, beispielsweise in einer angeschlossenen Färberei, verwendet werden.The arrangement of the
Claims (7)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8383110084T DE3371244D1 (en) | 1983-10-08 | 1983-10-08 | Process and apparatus for drying yarn or fibre packages |
| EP83110084A EP0137067B1 (en) | 1983-10-08 | 1983-10-08 | Process and apparatus for drying yarn or fibre packages |
| US06/658,196 US4590683A (en) | 1983-10-08 | 1984-10-05 | Method of and apparatus for drying wound fiber or yarn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP83110084A EP0137067B1 (en) | 1983-10-08 | 1983-10-08 | Process and apparatus for drying yarn or fibre packages |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0137067A1 true EP0137067A1 (en) | 1985-04-17 |
| EP0137067B1 EP0137067B1 (en) | 1987-04-29 |
Family
ID=8190737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83110084A Expired EP0137067B1 (en) | 1983-10-08 | 1983-10-08 | Process and apparatus for drying yarn or fibre packages |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4590683A (en) |
| EP (1) | EP0137067B1 (en) |
| DE (1) | DE3371244D1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0539607A4 (en) * | 1991-05-24 | 1993-10-06 | Nikku Industry Co., Ltd. | Vacuum drying apparatus |
| CN113007988A (en) * | 2021-04-02 | 2021-06-22 | 安徽德亚电池有限公司 | Drying device for battery cell pole piece |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2580004B1 (en) * | 1985-04-05 | 1987-06-26 | Barriquand | |
| JPH05317828A (en) * | 1992-05-15 | 1993-12-03 | Yoshida Kogyo Kk <Ykk> | Method and device for treating strips |
| US5410788A (en) * | 1992-11-10 | 1995-05-02 | Tns Mills, Inc. | Yarn conditioning process & apparatus |
| US5269052A (en) * | 1992-11-10 | 1993-12-14 | Tns Mills, Inc. | Yarn conditioning process |
| US5428884A (en) * | 1992-11-10 | 1995-07-04 | Tns Mills, Inc. | Yarn conditioning process |
| US5459990A (en) * | 1993-10-14 | 1995-10-24 | Tns Mills, Inc. | Facility and method for producing yarn |
| US5791135A (en) * | 1996-06-20 | 1998-08-11 | American & Efird, Inc. | Heat treatment of textile strands prior to plying |
| US6094840A (en) * | 1997-11-06 | 2000-08-01 | Xorella Ag | Method for the heat treatment of textiles |
| JP2001011738A (en) * | 1999-06-28 | 2001-01-16 | Tsuzuki Boseki Kk | Sliver compression method and apparatus |
| JP3815435B2 (en) * | 2000-06-08 | 2006-08-30 | 松下電器産業株式会社 | Circuit board manufacturing method |
| DE102008014961A1 (en) * | 2008-03-19 | 2009-09-24 | Then Maschinen Gmbh | Process for treating textile goods in the packing and plug-on system |
| JP4888575B2 (en) * | 2010-02-17 | 2012-02-29 | 日産自動車株式会社 | Drying apparatus and drying method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2010605A1 (en) * | 1970-03-06 | 1971-09-16 | Obermaier & Cie, 6730 Neustadt | Fibre and yarn drying plant |
| US3643340A (en) * | 1968-08-16 | 1972-02-22 | William Tatton & Co Ltd | Methods of drying yarns and apparatus therefor |
| DE2109696A1 (en) * | 1971-03-02 | 1972-09-21 | Obermaier & Cie, 6730 Neustadt | Device for carrying out a method for drying, in particular fibers and yarns |
| DE2417555A1 (en) * | 1973-04-11 | 1974-10-31 | Karrer System Ag Zollikon | Liquid treatment and/or drying of fibrous materials - in which the direction of flow is reversed during flow |
| FR2247388A1 (en) * | 1973-10-12 | 1975-05-09 | Anrep Rene | |
| DE3111223A1 (en) * | 1981-03-21 | 1982-10-07 | Arthur Pfeiffer Vakuumtechnik Wetzlar Gmbh, 6334 Asslar | Vacuum-drying process |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3010216A (en) * | 1956-11-17 | 1961-11-28 | Nat Res Corp | Apparatus for drying heat sensitive products |
| US3631691A (en) * | 1968-05-31 | 1972-01-04 | Friedrich W J Karrer | Apparatus for liquid-treating fiber materials and drying said materials |
| CH590439B5 (en) * | 1974-12-16 | 1977-08-15 | Karrer System Ag |
-
1983
- 1983-10-08 DE DE8383110084T patent/DE3371244D1/en not_active Expired
- 1983-10-08 EP EP83110084A patent/EP0137067B1/en not_active Expired
-
1984
- 1984-10-05 US US06/658,196 patent/US4590683A/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3643340A (en) * | 1968-08-16 | 1972-02-22 | William Tatton & Co Ltd | Methods of drying yarns and apparatus therefor |
| DE2010605A1 (en) * | 1970-03-06 | 1971-09-16 | Obermaier & Cie, 6730 Neustadt | Fibre and yarn drying plant |
| DE2109696A1 (en) * | 1971-03-02 | 1972-09-21 | Obermaier & Cie, 6730 Neustadt | Device for carrying out a method for drying, in particular fibers and yarns |
| DE2417555A1 (en) * | 1973-04-11 | 1974-10-31 | Karrer System Ag Zollikon | Liquid treatment and/or drying of fibrous materials - in which the direction of flow is reversed during flow |
| FR2247388A1 (en) * | 1973-10-12 | 1975-05-09 | Anrep Rene | |
| DE3111223A1 (en) * | 1981-03-21 | 1982-10-07 | Arthur Pfeiffer Vakuumtechnik Wetzlar Gmbh, 6334 Asslar | Vacuum-drying process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0539607A4 (en) * | 1991-05-24 | 1993-10-06 | Nikku Industry Co., Ltd. | Vacuum drying apparatus |
| CN113007988A (en) * | 2021-04-02 | 2021-06-22 | 安徽德亚电池有限公司 | Drying device for battery cell pole piece |
Also Published As
| Publication number | Publication date |
|---|---|
| US4590683A (en) | 1986-05-27 |
| DE3371244D1 (en) | 1987-06-04 |
| EP0137067B1 (en) | 1987-04-29 |
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