EP3601916B1 - Trockner für eine textile warenbahn mit einer einrichtung zur bestimmung der restfeuchte einer warenbahn und verfahren und anlage hierzu - Google Patents

Trockner für eine textile warenbahn mit einer einrichtung zur bestimmung der restfeuchte einer warenbahn und verfahren und anlage hierzu Download PDF

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Publication number
EP3601916B1
EP3601916B1 EP18705892.0A EP18705892A EP3601916B1 EP 3601916 B1 EP3601916 B1 EP 3601916B1 EP 18705892 A EP18705892 A EP 18705892A EP 3601916 B1 EP3601916 B1 EP 3601916B1
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EP
European Patent Office
Prior art keywords
dryer
web
moisture content
air
moisture
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.)
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EP18705892.0A
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German (de)
English (en)
French (fr)
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EP3601916A1 (de
Inventor
Markus Böhn
Andreas RÖSNER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Truetzschler Group SE
Original Assignee
Reifenhaeuser GmbH and Co KG Maschinenenfabrik
Truetzschler Group SE
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Publication of EP3601916A1 publication Critical patent/EP3601916A1/de
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    • 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
    • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
    • 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
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • 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
    • F26B13/06—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement with movement in a sinuous or zig-zag path
    • 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
    • F26B13/06—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement with movement in a sinuous or zig-zag path
    • F26B13/08—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement with movement in a sinuous or zig-zag path using rollers
    • 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
    • F26B13/24—Arrangements of devices using drying processes not involving heating
    • F26B13/30—Arrangements of devices using drying processes not involving heating for applying suction
    • 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
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • 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
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • 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
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • 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
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/02—Applications of driving mechanisms, not covered by another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried

Definitions

  • the present invention relates to a dryer for a textile web with at least one dryer room in which at least one air-permeable drum is rotatably arranged, which can be partially wrapped around by the web and wherein heated drying air can flow through the web, with at least one fan being provided in which moist drying air can be extracted from the inside of the drum from a front opening of the at least one drum.
  • the DE 10 2012 109 878 B4 discloses a dryer for a textile web with a dryer room in which several air-permeable drums are rotatably arranged, which can be partially wrapped around by the web.
  • the web is flowed through with heated drying air, which absorbs the moisture from the web.
  • Each drum is assigned a fan with which moist drying air is sucked out of the inside of the drum from an opening in the drum. Heat is supplied by circulating the drying air and the heated drying air is returned to the dryer room.
  • Heating elements which are arranged in the heating and fan room, are used to input the heat that is necessary to heat the drying air.
  • the heating elements are arranged in such a way that the air flow, the drying air flowing radially or tangentially from the fan, flows around them.
  • three drums are provided to the textile web is passed around one after the other, three at least partially separate drying air circuits are provided, and each drying air circuit is generated by an assigned fan.
  • Each drying air circuit is assigned its own heating elements so that the heat is supplied to each drying air circuit separately.
  • the drying of the textile web takes place step by step.
  • the removal of moisture from the textile web does not occur uniformly in each dryer room and with a constant drying gradient; rather, the textile web goes through a drying cascade with several dryer rooms, and the degree of drying of the textile web, which leaves the dryer via an outlet roller, should be a required one Have residual moisture.
  • drying takes place with a minimum energy input into the dryer, so that, for example, there is a residual moisture of 8% in the textile web when it leaves the dryer, so that the energy input via the heat supply and the operation of the fan for the entire dryer should be minimal.
  • this determination of the residual moisture is carried out by measuring the initial moisture content of the web when it enters the dryer and by measuring the final moisture content of the web when it leaves the dryer.
  • Known measuring methods for the final moisture content of the web require a minimum moisture level, whereby it is assumed that the fibers of the web can absorb and store moisture. Fibers made from non-natural materials, such as spunbond, continuous filaments or staple fibers made of plastic, cannot store moisture, but rather take the moisture with them through adhesion. Accurate measurements in the range of A maximum of 1% specific humidity is therefore not possible,
  • the object of the invention is to develop a dryer for drying a textile web and to develop a method for operating such a dryer, whereby the dryer and the method should enable drying of the textile web with the minimum possible use of energy.
  • the residual moisture of the web should be able to be determined and the drying performance of the dryer should be adjustable to a specific residual moisture.
  • the invention includes the technical teaching that the dryer has at least one sensor for determining the moisture of the exhaust air flow, the data of which is processed in a control with the initial moisture of the web and the moisture of the fresh air flow and thus the evaporation performance of the dryer is regulated.
  • the core idea of the invention is the approach of determining the residual moisture in the web by looking at the mass balance in a control system.
  • the control system uses the mass flow of the exhaust air and its specific humidity to calculate the evaporation performance of the drying process.
  • the difference between the amount of water introduced into the process (initial moisture of the web and initial moisture of fresh air) and the evaporation capacity of the dryer (moisture of the exhaust air) results in the amount of water remaining in the web.
  • disturbance variables can be processed in the control.
  • the dryer in addition to the control in the channel for the exhaust air, the dryer preferably has at least one sensor with which the temperature, the volume flow and the humidity of the exhaust air are determined.
  • the initial moisture of the web and the moisture of the fresh air flow are subtracted from the humidity of the exhaust air (absolute or relative) in order to determine the residual moisture of the web. Since the required evaporation output of the dryer can be determined using these parameters, the energy requirement of the dryer can be minimized with a specified residual moisture, since the heating output and/or the extracted volume of the exhaust air flow can be adjusted via the control.
  • a simple and inexpensive sensor system can be used in which the continuous process does not have to be interrupted due to sampling.
  • the senor for determining the volume of the exhaust air has a measuring orifice or is designed after the vortex flow measurement. Both variants enable a particularly reliable, sufficiently accurate and inexpensive measuring instrument for this application.
  • ultrasonic volume flow measurement can be used and/or the characteristic curve of the fan can be used for the evaluation
  • the temperature, the mass flow and the moisture of the web can also be determined via at least one sensor, which is or are arranged on or in front of the dryer. This can be, for example, the kissroll and/or the batch station in which the finish is mixed with water.
  • the absolute or relative humidity of the web can be determined based on existing parameters from system components that are arranged in the direction of travel of the web in front of the dryer and this data can be entered into the control.
  • the controller preferably has at least one process module and one energy module.
  • the energy module interacts with the control of the at least one heating element and/or with the control of the at least one fan.
  • the mass balance of moisture is calculated in the process module. If there is a deviation from a reference variable of the desired residual moisture of the web, the process module controls the energy module, which in turn determines the minimum energy requirement for an increased or reduced drying performance and optionally controls the heating element(s) and/or the fans.
  • the method according to the invention is based on the knowledge that the evaporation performance of the dryer can be minimized by considering the mass balance of the moisture introduced into the dryer.
  • the radiometric measurement of the continuously running web after the dryer which is required according to the state of the art, can be dispensed with.
  • the process can be operated with a minimum of inexpensive sensor technology. Due to its accuracy, this process is particularly suitable for webs with low weight made of fibers (e.g. spunbond) that cannot store moisture.
  • the humidity and temperature of the fresh air are preferably determined using the same sensors that also provide the data for the exhaust air. This requires the dryer to run empty without the heating elements switched on and without the material web, as the ambient air in the production hall does not change continuously. This determines the humidity and temperature of the ambient air of the dryer determined, which draws its fresh air from the surroundings (production hall). This set of sensors, which would otherwise have to be located at the inlet of the dryer where the fresh air is drawn in, can be dispensed with. The volume of fresh air required to calculate the mass balance is ultimately determined by the fan performance of the dryer. The first approach is to assume that the amount of fresh air is equal to the amount of exhaust air.
  • the volume of fresh air must also be measured when running empty, so that the volume of false air is included in the consideration of the disturbance variable.
  • the measurement of the volume of fresh air can then also be measured via the sensor for determining the exhaust air in the exhaust air duct.
  • the exhaust air is also monitored in terms of temperature, volume flow and humidity using sensors.
  • these values are the most sensitive measured values of the process. Therefore, for example, the volume flow is determined using accurate and inexpensive flow measurement, or alternatively using vortex flow measurement or other methods.
  • the determination of the mass flow and the moisture of the web entering the dryer can be done using sensors, or determined mathematically, or based on the operating data of an upstream system component, for example the kissroll and/or the batch station.
  • the computational determination or the use of the operating data of an upstream system component can increase the accuracy of the method and make it cheaper, since, for example, a radiometric method for determining the moisture of a continuously running web can be dispensed with.
  • the further advantage lies in the use at low moisture levels and with low surface weights of the web, since the computational method can be more precise than the known measuring methods.
  • known disturbance variables such as incorrect air in the dryer, uneven finishing times and/or fluctuations in moisture across the working width of the web are entered into the control and processed.
  • the module according to the invention for use on a dryer for determining the residual moisture of a dried web of material comprises a control with at least one process module for calculating the mass balance of the specific or relative humidity of the fresh air, exhaust air and the web, an energy module for controlling at least one heating element and at least a fan with sensors to determine the temperature, humidity and volume flow of the fresh air and the exhaust air from the dryer.
  • the module can preferably be supplemented with sensors for determining the temperature, mass flow and moisture of a continuously running web if process data from system components in the direction of travel of the web in front of the dryer are not available.
  • the module can have an interface or an input device.
  • the dryer according to the invention, the method and the module are preferably used for systems for producing webs made of plastic, continuous filaments such as spunbond or staple fibers made of non-natural fibers, which, in contrast to webs made of natural fibers, cannot store moisture.
  • FIG. 1 shows a perspective view of a dryer 1, which is designed as a series dryer.
  • a dryer room 2 Within a dryer room 2, three drums 3a, 3b, 3c are arranged one behind the other and with their axes 4a, 4b, 4c in a row.
  • a web of material 5 is guided into the dryer room 2 via an inlet 6.
  • the material web 5 is guided via a deflection roller 7 first below the first drum 3a, then above the second drum 3b and then below the third drum 3c.
  • the web 5 is led out of the dryer room 2 through an outlet 9 via a deflection roller 8. While passing through the dryer room 2, the web 5 is flowed through with heated drying air.
  • the drying air takes the Moisture from the web 5 and is sucked out through the interior of the drums 3a to 3c.
  • An additional chamber 10 can be arranged on the dryer room 2, into which the channel 12 for the fresh air 11 and the channel 14 for the exhaust air 13 open.
  • the additional chamber 10 can be completely separate and constructed separately from the dryer room 2.
  • the heating and fan room 22 is arranged on the additional chamber 10.
  • the dryer room 2 is connected to the heating and fan room 22 with air ducts above and below the drums 3a - 3c.
  • the additional chamber 10 is connected to the dryer room 2 via the front opening of the drums 3a - 3c.
  • the duct connection 15 can be used as a connection for a heat exchanger.
  • sensors 18, 19, 20 for determining the temperature, the volume flow and the humidity of the exhaust air 13 are arranged in the channel 14.
  • the moisture of the web 5 can be determined in the area of the inlet 6 at or in front of the dryer 1 using sensors 23, 24, 25, whereby the temperature, the mass flow and the moisture of the web 5 can also be determined here.
  • Figure 2 shows a dryer 1 with only one drum 3, in which the web 5 enters the dryer 1 from the right through an inlet 6.
  • the material web 5 is guided into the dryer room 2 by a first deflection roller 7, guided around the drum 3 and led out of the dryer room 2 by the deflection roller 8.
  • the fresh air 11 is sucked in through the inlet into the dryer 1 and is distributed laterally below the drum 3 throughout the entire dryer room 2.
  • a shielding element not shown, ensures that the fresh air sucked in is not sucked directly into the drum 3.
  • a heating element 21, for example a burner heats the fresh air sucked in, which is sucked in by a fan 17 at an end face of the drum 3.
  • the heated fresh air flows through due to that generated by the fan 17 Pressure difference first the screen cover 16, with which the flow is evened out.
  • the heated fresh air then flows through the drum 3 with the wrapping web 5, thereby absorbing the moisture from the web 5.
  • the resulting exhaust air 13 is discharged via the channel 14.
  • the residual moisture in the web 5 is determined by looking at the mass balance in a control system.
  • the evaporation performance of the drying process is calculated in the control via the mass flow of the exhaust air 13 and its specific humidity.
  • the difference between the amount of water introduced into the process (initial moisture of the web and initial moisture of fresh air) and the evaporation capacity of the dryer (moisture of the exhaust air) results in the amount of water remaining in the web.
  • 13 sensors 18, 19, 20 are attached in the channel 14 for the exhaust air, which measure the temperature, the air volume and the humidity of the air flow.
  • the values for the initial humidity of the fresh air 11 can be measured with the same sensors 18, 19, 20 as the values for the humidity of the exhaust air 13.
  • the fan 17 is used with the heating element switched off and the web 5 not inserted Fresh air 11 is sucked in and measured by the sensors 18, 19, 20.
  • the measured values serve as a zero point or reference for the mass balance. This measurement only needs to be repeated under the same conditions if there are large deviations in temperature or humidity in the plant hall. If a gas burner is used as the heating element 21, it also introduces water into the drying process through the burning process.
  • This proportion of water is taken into account via the gas consumption in the calculation of the final moisture content.
  • the required values for the initial humidity of the fresh air 11 can also be taken from the Ambient air of the dryer 1 can be determined, since the fresh air 11 is sucked in from the environment of the dryer 1. Taking into account that no significant proportion of false air has to be taken into account, the volume of fresh air 11 is determined by the fan performance.
  • the moisture of the exhaust air 13 is also measured via the sensors 18, 19, 20 in the channel 14.
  • the sensor 18 records the temperature in degrees Celsius
  • the sensor 19 the volume flow of the exhaust air 13 in m 3 /h
  • the sensor 20 the humidity of the exhaust air 13 in kg/m 3 .
  • Possible pressure differences between the exhaust air 13 and the fresh air 11 can be neglected in the mass balance.
  • the volume flow of the exhaust air 13 is normally equal to the volume flow of the fresh air 11 sucked in, since the suction power of the fan 17 also sucks out false air through the web 5 and the drum 3 - 3c through the channel 14.
  • the input moisture that enters the dryer 1 can also be measured, for example by arranging a sensor 25 for measuring the moisture in front of the inlet 6 of the dryer 1, or on an upstream system component, for example a kissroll or a pair of squeezing rollers .
  • the input moisture can also be determined indirectly by a parameter from the process in front of the dryer, for example by the liquid consumption of a kissroll or from the difference between liquid entry into the web and the removal of residual liquid into a processing system.
  • the application of finishing agent or liquid can be determined using level sensors.
  • the sensor 18 for measuring the temperature of the exhaust air 13 can be designed as a thermometer or work according to the semiconductor effect. Degrees Celsius can preferably be included in the control as the output value
  • the sensor 19 for measuring the volume flow is preferably designed as a flow sensor with a measuring orifice.
  • vortex flow measurement can also be used, which is based on the principle of vortex flow measurement.
  • Alternative measurement methods can be carried out using ultrasound or a dynamic pressure probe.
  • m 3 /h can preferably flow into the control as the output value.
  • the sensors 18 and 19 can of course also be combined.
  • the sensor 20 for determining moisture can be designed as a capacitive thin-film polymer sensor or as a ceramic sensor.
  • the output value can preferably be kg/m 3 absolute humidity or the relative humidity in percent in the control.
  • the moisture of the web 5 before the inlet 6 of the dryer 1 can also be determined mathematically by entering the liquid entry into the web with the mass flow of the web into the control. This process is very precise and only makes sense if the web cannot absorb any liquid or can only absorb a small proportion (up to 1%). This applies, for example, to webs made of plastic, continuous filaments or staple fibers made from non-natural fibers, in particular spunbond, in which the moisture is not physically bound, but only through the surface of the fibers is carried along. Alternatively, one or more sensors 25 made of ceramic can be used, which determine its moisture through direct contact with the web. This makes sense for webs made from fibers that can absorb and store moisture (cellulose, fiber blends, cotton).
  • the sensor 23 for measuring the temperature at the inlet 6 of the dryer 1 can again be designed as a thermometer or work according to the semiconductor effect. Degrees Celsius can preferably be included in the control as the output value
  • the mass flow of the material web at the inlet 6 of the dryer 1 can again be determined mathematically from the system parameters or alternatively by a sensor 24, which works radiometrically, for example.
  • the values of the incoming web 5 into the dryer 1 can also be at least partially measured to determine the mass balance and another part can be determined or calculated from the upstream system components. This depends on the system configuration and the available values.
  • Figure 3 shows in simplified form the mass balance ⁇ of the drying process, in which a mass flow m of the web 5 with an absolute or relative humidity H 2 O enters the dryer 1 and a mass flow m of the web 5 with an absolute or relative humidity H 2 O flows out of the dryer 1 comes out.
  • Further process parameters that are processed in the dryer 1 are the mass flow ⁇ of fresh air 11 with an absolute or relative humidity H 2 O at a temperature T to be determined, and the mass flow of moisture H 2 O at an adjustable temperature T from the heating element 21 (gas burner) or the heating and fan room 22.
  • the mass flow m of exhaust air 13 is subtracted an absolute or relative humidity H 2 O at a temperature T to be measured. Since the fan 17 generates a negative pressure in the dryer, the sensors 18, 19, 20 are arranged in the channel 14, where there is already ambient pressure, the parameter can be accessed Pressure can be dispensed with because all measurements are carried out at the same ambient pressure in the production hall.
  • Disturbances 26 can include, for example, the false air from the dryer from the production hall, fluctuations in the application of the finish of the upstream padding or kissroll and the possible evaporation or spray off, inaccuracies of the sensors and fluctuations in the input moisture of the web across the working width in the calculation of the mass balance flow in.
  • the disturbance variables 26 are usually determined empirically and can increase or decrease the calculated mass balance.
  • the device according to the invention and the associated method are particularly advantageous for spunbonds, since spunbonds, in contrast to cellulose, for example, cannot store moisture and therefore there are very low moisture values with correspondingly high inaccuracies.
  • Cellulose on the other hand, is almost never dry because the chalk residues in the cellulose are hygroscopic and moisture is therefore stored in the fibers.
  • spunbonds there are usually no water components in the fiber upstream of the kissroll or padding, as only surface water and capillary water is carried along with the web.
  • spunbond In comparison to staple fiber fleece made from natural fibers, for example, spunbond carries very little water, which is hardly measurable.
  • the inaccuracies of the classic measuring methods have a very unfavorable effect and result in fluctuations in the measured values with which the dryer cannot be operated stably.
  • the method for determining the mass balance is significantly cheaper and requires little sensor technology more reliable than the measurement technology used to date, with which the final moisture content of the running web is measured.
  • FIG 4 a schematic view of the structure of the control 30 in interaction with a dryer room 2 of the dryer 1, with only a single dryer room 2 being shown as an example.
  • the control 30 is preferably an integral part of the dryer 1. However, it can also be part of an overall system with which the process of producing the web of material is monitored and regulated up to the winding of the finished web of material on a subsequent winder.
  • the controller 30 can have an energy module 31 and a process module 32.
  • the energy module 31 is designed to monitor at least the heat supply through the heating element 21 and/or the fan 17.
  • the process module 32 is designed to process the measured values of the sensors 23, 24, 25 or the calculated values to be entered or determined values for the input moisture of the web 5 into the dryer. Furthermore, the process module 32 processes the measured values of the sensors 18, 19, 20 in the exhaust air 13. At the same time, the process module 32 also processes the disturbance variables 26, which are entered into the control 30 according to the system configuration and the web of material to be processed. Instead of the sensor 25 for the moisture of the web 5 at the inlet 6 of the dryer 1, a calculated value for the moisture can also be entered into the control 30, which is determined using an upstream system component such as a kissroll. The process module 32 can therefore process not only direct measured values, but also computational data or entered values from the process in front of the dryer 1.
  • the separation of the control 30 into a process 32 and a Energy module 31 enables the use and interconnection of the already existing control of the heating element 21 and/or the fan 17 or the fan room 22 as an energy module 31, whereby the process module 32 can then be designed as part of a control for the entire system.
  • the mass balance ⁇ of the moisture is calculated within the process module 32.
  • the control 30 designed according to the invention, the possibility is created that when the residual moisture of the textile web 5 is required when it passes through the dryer 1, the heat is supplied by the heating element 21 and / or the fan 17 of the drying room 10 through which the textile web passes with the corresponding energy in such a way that a minimum total energy requirement is achieved.
  • the energy module 31 is therefore used to control the heat supply through the heating element 21 and also the fan 17 in such a way that the dryer room 2 is supplied with only minimally required energy.
  • a cost-optimized operation of the dryer can be achieved, since the costs for electricity (fan 17, 22) are approximately four times as high as for gas (burner, heating element 21) and the energy module 31 can be operated in both an energy-optimized and cost-optimized manner. Since many system operators also have their own gas or electricity generation, energy-optimized operation of the dryer can differ from cost-optimized operation.
  • the control provides the system operator with the appropriate tools to select the optimal operating method for him.
  • An ideal drying process is achieved, which achieves drying air with an optimal proportion of superheated steam for the dryer room 2. If there is a deviation (control deviation) from the specified residual moisture (reference variable) in the web 5, the process module 32 controls the energy module 31, which in turn controls the heating output and/or the amount of air extracted is either increased or reduced in an energy or cost-optimized manner.
  • a self-adjusting dryer 1 with minimal energy is created.
  • the control 30 of the dryer 1 ensures a minimal flow of energy into the respective dryer room 2, so that the energy consumption is minimized in order to achieve the required residual moisture of the textile web 5.
  • the respective operating states depend on the quality and the initial moisture content of the textile web, so that, for example, empirical values can be entered via a control panel of the dryer 1 as to which control values are necessary for the air conditioning of the individual dryer rooms 2.
  • the exemplary embodiment relates to a dryer with a drum 3.
  • the heating elements 21 or the fans 17 or the fan room 22 can be controlled separately in a series dryer for a dryer room 2 with several drums 3 - 3c, since the moisture absorption of the dryer air from the first drum 3 decreases to the last drum 3c.
  • the facility according to Figure 5 shows schematically the production of a spunbond, which is spun in a spinnerette (not shown) made of thermoplastic, cooled and deposited on a rotating conveyor belt 40 by means of a diffuser 41.
  • the conveyor belt is preferably designed as an air-permeable sieve belt in order to fix the spunbond on the conveyor belt 40 by suction and at the same time remove liquids from the subsequent treatments.
  • a first pair of outlet rollers 42 which can optionally be heated, can compact the deposited spunbond.
  • a first moistening 43 by a spray bar which promotes the uniform placement of the spunbond on the conveyor belt 40, since the individual filaments are thereby better fixed, a first suction 44 of the applied liquid takes place.
  • a first solidification 45 for example by means of water jets, can solidify and compact the web 5 made of spunbond. Here too, excess water is sucked out via a suction 44.
  • a subsequent treatment device 46 for example a kissroll or a foulard, applies a treatment liquid to the web 5.
  • a finishing agent can be used as the treatment liquid, with which the properties of the spunbond are improved with regard to the end product.
  • the web 5 then passes through a dryer 1, which in this exemplary embodiment is designed as an Omega dryer with a drum 3.
  • the material web 5 is set to a predetermined residual moisture by adjusting the evaporation capacity of the dryer 1 and, after passing through the dryer, is fed to a further treatment or a winding process.
  • fresh air 11 is supplied to the dryer, the moisture content of which is determined from the environmental data or by an empty measurement of the dryer 1.
  • the humidity (volume flow, temperature, humidity) of the exhaust air 13 is determined using sensors.
  • the moisture content of the web 5 entering the dryer 1 can be determined mathematically, measured using sensors before the dryer enters, or determined based on the process parameters of the treatment device 46 and entered into the controller 30.
  • the system configuration shown here is an example and can have further or no consolidation 45 for treating the spunbond.
  • the system can also be supplemented with additional components, or the humidification 43 can be dispensed with after the spunbond has been deposited on the conveyor belt.
  • the invention has the advantage that to determine the residual moisture, the web is not affected (cutting out samples), the web can run continuously and is not touched by measuring elements.
  • the process is independent of the product properties of the web, which can have a significant influence on the measurement result in a direct (contact) measurement.
  • Another advantage is that, compared to gravimetric or volumetric measuring methods, measurement-related influences of disturbance variables are eliminated, as these methods only relate to the water mass flow. Particularly in the case of spunbonds where the mass ratio between the web and the amount of water is unfavorable or large, low final moisture contents ( ⁇ 1%) can be reliably determined with small surface weights (e.g. 10g/m 2 ) while the web is running.
  • the invention determines the residual moisture of the web without contact, speeds of over 500 m/min do not affect the accuracy. Another advantage is the control of the dryer for energy optimization, since at a given residual moisture the dryer performance is adjusted. In comparison to previous measurement methods, the invention provides a very inexpensive and sufficiently accurate solution, since no complex sensors have to be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
EP18705892.0A 2017-03-30 2018-02-15 Trockner für eine textile warenbahn mit einer einrichtung zur bestimmung der restfeuchte einer warenbahn und verfahren und anlage hierzu Active EP3601916B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017106887.2A DE102017106887A1 (de) 2017-03-30 2017-03-30 Trockner für eine textile Warenbahn mit einer Einrichtung zur Bestimmung der Restfeuchte einer Warenbahn und Verfahren, Modul und Anlage hierzu
PCT/EP2018/053735 WO2018177648A1 (de) 2017-03-30 2018-02-15 Trockner für eine textile warenbahn mit einer einrichtung zur bestimmung der restfeuchte einer warenbahn und verfahren, modul und anlage hierzu

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EP3601916A1 EP3601916A1 (de) 2020-02-05
EP3601916B1 true EP3601916B1 (de) 2024-02-07

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US (1) US11125501B2 (es)
EP (1) EP3601916B1 (es)
CN (2) CN113483552B (es)
AR (1) AR111552A1 (es)
DE (1) DE102017106887A1 (es)
ES (1) ES2972596T3 (es)
MX (1) MX2019010413A (es)
RU (1) RU2721390C1 (es)
WO (1) WO2018177648A1 (es)

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US11125501B2 (en) 2021-09-21
CN113483552A (zh) 2021-10-08
MX2019010413A (es) 2019-10-15
CN110382983A (zh) 2019-10-25
WO2018177648A1 (de) 2018-10-04
BR112019018131A2 (pt) 2020-04-07
AR111552A1 (es) 2019-07-24
CN113483552B (zh) 2022-11-18
ES2972596T3 (es) 2024-06-13
US20200033059A1 (en) 2020-01-30
BR112019018131A8 (pt) 2022-07-05
CN110382983B (zh) 2022-01-07
RU2721390C1 (ru) 2020-05-19
DE102017106887A1 (de) 2018-10-04
EP3601916A1 (de) 2020-02-05

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