EP3918119B1 - Optimierung eines spinnprozesses bezüglich fremdmaterialien. - Google Patents

Optimierung eines spinnprozesses bezüglich fremdmaterialien. Download PDF

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Publication number
EP3918119B1
EP3918119B1 EP20704380.3A EP20704380A EP3918119B1 EP 3918119 B1 EP3918119 B1 EP 3918119B1 EP 20704380 A EP20704380 A EP 20704380A EP 3918119 B1 EP3918119 B1 EP 3918119B1
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EP
European Patent Office
Prior art keywords
foreign material
material information
spinning process
foreign
fiber
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EP20704380.3A
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German (de)
English (en)
French (fr)
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EP3918119A1 (de
Inventor
Loris De Vries
Ulf Schneider
Oswald BALDISCHWIELER
Pavel PLISKA
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Uster Technologies AG
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Uster Technologies AG
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Publication of EP3918119A1 publication Critical patent/EP3918119A1/de
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G31/00—Warning or safety devices, e.g. automatic fault detectors, stop motions
    • D01G31/003—Detection and removal of impurities
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/22—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to presence of irregularities in running material

Definitions

  • the present invention is in the field of yarn spinning. It relates to a method for optimizing a spinning process with regard to foreign materials and a device for carrying out the method, according to the independent patent claims.
  • the WO-2006/079426 A1 discloses a method and apparatus for separating foreign matter from fibrous material, particularly raw cotton. Such methods are used, for example, in the blowroom to prepare the raw cotton for spinning.
  • a pneumatic fiber transport line the fiber material is guided past a sensor system and a separation device one after the other.
  • foreign materials are detected by the sensor system, they are removed from the fiber transport line through a removal opening in the fiber transport line by means of a compressed air pulse directed transversely to the fiber transport line.
  • a corresponding product is in the brochure " USTER® JOSSI VISION SHIELD 2 - The key to Total Contamination Control", Uster Technologies AG, October 2015 , described.
  • a yarn clearer includes a measuring head with at least one sensor that scans the moving yarn and thereby detects yarn defects such as foreign materials or thick and thin spots. The sensor's output signal is continuously evaluated according to specified criteria.
  • the US-6,244,030 B1 discloses a yarn clearer that not only detects foreign materials but also distinguishes different types of foreign materials from each other. The sensor scans the yarn optically with reflected light. A binning field or matrix is provided. The length of yarn sections is plotted along the horizontal axis of the classification field and the reflectivity of light on the yarn is plotted along the vertical axis.
  • the classification field is divided into 16 classes for light foreign materials and 16 classes for dark foreign materials. Yarn sections of the same class are counted. A corresponding product is in the brochure " USTER® QUANTUM 3 Application Handbook", Section 8.4, Uster Technologies AG, April 2011 , described.
  • the WO-2017/190259 A1 describes a method and apparatus for monitoring contamination in a fiber tuft stream.
  • a first monitor monitors contaminants in a fiber fluff stream while a second monitor monitors contaminants downstream in the textile manufacturing process.
  • the second monitoring device can be a yarn clearer on a winding machine.
  • a control unit is connected to the first and second monitoring devices. It collects data from the two monitors, evaluates them statistically and issues reports produced therefrom to an operator. In a control loop, a limit for removing the impurities in the first monitor is changed depending on a monitoring result of the second monitor.
  • control devices for stretching processes in autoleveling draw frames in the textile industry can operate according to the open or closed control loop principle in order to obtain a strip with a uniform cross-section at the outlet of the stretching passage.
  • the measurement signal from a fast-reacting measuring device at the exit of the section is correlated with another measurement signal at the entry to the section.
  • the parameters that determine the amount of distortion are corrected in such a way that short-term fluctuations in the cross-section of the strip are also compensated for.
  • the transit time of the strip from the actuator to the measuring device at the exit of the draw frame and the overall amplification of the measuring signal are particularly important.
  • the optimization should relate in particular to the yarn quality and/or the production costs: the yarn quality should be increased with the same production costs, the production costs should be reduced with the same yarn quality, or the yarn quality should be increased and the production costs should be reduced at the same time.
  • a higher yarn quality means a lower proportion of disruptive foreign materials in the yarn.
  • the production costs are e.g. influenced by the amount of fiber material rejected as waste and the frequency of winder shutdowns.
  • a further object of the invention is to provide a device for carrying out the method.
  • the invention is based on the idea of associating foreign material information that was determined at two different points in the spinning process with one another and making a change to the spinning process on the basis of the foreign material information that is associated with one another.
  • the allocation must be made in such a way that the foreign material information essentially relates to the same sample of the fiber material.
  • sample refers to an associated quantity of the fiber material which essentially has the same, essentially homogeneously distributed properties.
  • the size of the sample can range from a flock of fibers with a mass of less than 1 g to several tons of fiber material.
  • An example of a sample is a presentation of 50 cotton bales of 220 kg each (total 11 1), as found in an opening shop.
  • the sample goes through the spinning process; their structure and shape change depending on the respective process step.
  • the same sample can B. take the form of raw fibers, fiber flock, batt, sliver, roving or yarn.
  • the sample can be divided into different processing machines during the spinning process.
  • the method according to the invention serves to optimize a spinning process, which is run through by a fiber material fed in in the form of raw fibers and output in the form of yarn, with regard to foreign materials in the fiber material.
  • first foreign material information relating to the foreign materials is ascertained.
  • second foreign material information relating to the foreign materials is determined.
  • the first position or the second position corresponds to a process step from the following set: opening, coarse cleaning, mixing, fine cleaning, carding, doubling, combing, stretching, spinning, rewinding.
  • the first piece of foreign material information and the second piece of foreign material information are associated with one another in such a way that they relate to the same sample of the fiber material.
  • a change is made to the spinning process on the basis of the first piece of foreign material information and the second piece of foreign material information assigned to it.
  • the first foreign material information and the second foreign material information can be determined on the entire sample of the fiber material or on a subset of the sample of the fiber material. It can take place continuously or at discrete points in time. It can be done online in the spinning process or offline by taking the sample of the fiber material or a portion thereof from the spinning process and using it outside of the spinning process, e.g. B. in a textile laboratory is examined.
  • the change to the spinning process may involve a change in the raw fibers fed into the spinning process, or at least part thereof, and/or a change in settings on machines involved in the spinning process.
  • the mutual assignment of the first foreign material information and the second foreign material information preferably includes one of the following steps: determining a throughput time as that time interval during which a fiber runs from the first point to the second point in the spinning process; determining a property of the sample itself; and labeling a carrier of the sample.
  • the throughput time can be determined empirically or theoretically from known processing and storage times.
  • their chemical composition can be used, whereby the natural composition of the fiber by means of genetic analysis and / or an artificially added label (marker) can play a role.
  • the carrier of the sample can be cans or coil cores on which optical and/or electromagnetic markings are applied.
  • a flow of fiber tufts which are pneumatically conveyed in an air current, is monitored for foreign materials.
  • the first piece of foreign material information is determined on the basis of the monitoring.
  • yarn that has been spun from the fiber tufts and is conveyed along its length is monitored for foreign materials.
  • the second piece of foreign material information is determined on the basis of the monitoring.
  • a transit time is defined as the time interval during which a fiber travels from the first point to the second point in the spinning process.
  • the first foreign material information is at a first point in time and the second foreign material information is determined at a second point in time, which is after the first point in time by the throughput time.
  • the first item of foreign material determined in this way and the second item of foreign material determined in this way are assigned to one another.
  • the first foreign matter information is a first foreign matter rate indicating a rate of foreign matter in the fiber flock
  • the second foreign matter information is a second foreign matter rate indicating a rate of foreign matter in the yarn.
  • the first foreign material level substantially indicates a number of foreign materials per unit mass of fiber flock or per unit time
  • the second foreign material level substantially indicates a number of foreign materials per unit mass of yarn, per unit length of yarn or per unit time.
  • the change to the spinning process involves a change in the separation criterion.
  • the first foreign matter information may be a rejection rate indicating a number of rejection per unit mass of fiber floc or per unit time.
  • a relationship between the separation criterion and the separation rate is advantageously determined beforehand, and this relationship is taken into account when the spinning process is changed.
  • the second foreign matter information is a cleaning rate indicating a number of cleaning operations per unit mass of yarn, per unit length of yarn, or per unit time.
  • a connection between the cleaning criterion and the cleaning rate can be determined beforehand and this connection can be taken into account when changing the spinning process.
  • Costs for an elimination can be determined in advance and when changing the spinning process a product of the cost of an elimination and the elimination rate. Costs for a cleaning process can be determined beforehand and a product of the costs for a cleaning process and the cleaning rate can be taken into account when changing the spinning process.
  • the change to the spinning process is advantageously made in such a way that the linear combination takes on a smaller value after the change than before the change, and preferably in such a way that a global minimum of the linear combination is reached.
  • the throughput time can be entered manually by an operator, calculated automatically on the basis of specifications and/or retrieved from a database on the basis of specifications.
  • first classes of foreign materials in the fiber material are predetermined at the first location, which first classes differ from one another with regard to properties of the foreign materials, and the first foreign material information relates to one or more of these first classes.
  • second classes of foreign materials in the fiber material can be predetermined at the second location, which second classes differ from one another with regard to properties of the foreign materials, and the second foreign material information can relate to one or more of these second classes.
  • the first foreign material information and the second foreign material information are issued to an operator at the same time.
  • the simultaneous output of the first foreign material information and the second foreign material information can be at least partially graphical.
  • an evaluation of the first item of foreign material and/or the second item of foreign material can be output to the operator.
  • the evaluation preferably includes at least two categories that indicate appropriate or critical foreign material information.
  • a recommendation for the change in the spinning process can be output to the operator.
  • an alarm is issued to an operator on the basis of the first piece of foreign material information and the second piece of foreign material information associated therewith.
  • a time profile of the first piece of foreign material information and a time profile of the second piece of foreign material information assigned to it are determined, and the alarm is output on the basis of the time profiles.
  • the operator makes the change to the spinning process on the basis of the simultaneously output first piece of foreign material information and second piece of foreign material information, on the basis of the evaluation and/or on the basis of the recommendation.
  • the change to the spinning process is made automatically.
  • a worldwide frequency distribution of a foreign material content in fiber flocks and/or in yarns is determined beforehand, and this frequency distribution is taken into account when changing the spinning process.
  • the invention also relates to a device for carrying out the method according to the invention in a spinning mill carrying out a spinning process which is run through by a fiber material fed in in the form of raw fibers and output in the form of yarn.
  • the device includes a first monitoring device at a first point in the spinning process. The first monitoring device is set up to determine first foreign material information relating to the foreign material.
  • the apparatus further includes a second monitoring device at a second location in the spinning process, downstream of the first location. The second monitoring device is set up to provide a second monitoring device relating to the foreign materials determine foreign material information.
  • the first position or the second position corresponds to a process step from the following set: opening, coarse cleaning, mixing, fine cleaning, carding, doubling, combing, stretching, spinning, rewinding.
  • the device also includes a central control device connected to the first monitoring device and the second monitoring device.
  • the central control device is set up to assign the first piece of foreign material information and the second piece of foreign material information to one another and to automatically make a change to the spinning process on the basis of the first piece of foreign material information and the second piece of foreign material information assigned to it.
  • the central control device is set up to simultaneously output the first item of foreign material information and the second item of foreign material information to an operator.
  • the apparatus includes a fiber tuft monitor at the first point in the spinning process.
  • the fiber tuft monitoring device is set up to monitor a stream of fiber tufts, which are conveyed pneumatically in an air stream, for foreign materials and to determine the first item of foreign material information on the basis of the monitoring.
  • the device also includes a yarn monitoring device at the second point in the spinning process.
  • the yarn monitoring device is set up to monitor yarn that has been spun from the fiber tufts and is conveyed along its longitudinal direction for foreign materials and to determine the second piece of foreign material information on the basis of the monitoring.
  • the central control device is set up to store a throughput time as the time interval during which a fiber runs through from the first point to the second point in the spinning process, the first foreign material information at a first point in time and the second foreign material information at a second point in time, which is around the throughput time is after the first point in time, to store and to assign the first foreign material information determined in this way and the second foreign material information determined in this way to one another.
  • the spinning process is optimized with regard to foreign materials.
  • a high yarn quality is achieved because few foreign substances remain in the yarn.
  • productivity is high because little fiber material is discarded as waste.
  • figure 1 shows schematically a part of a spinning process 1, which takes place in a spinning mill.
  • the spinning process 1 z. B. yarn spun from raw cotton.
  • the spinning process 1 can e.g. B. include the following process steps: opening, coarse cleaning, mixing, fine cleaning 11, carding 12, doubling, combing, stretching, spinning 13, rewinding 14. Not all process steps 11-14 mentioned need to be run through, and further process steps can be added. For the sake of simplicity, in figure 1 only a few process steps 11-14 are shown schematically, while others are indicated by dots.
  • a device 2 according to the invention is also shown schematically.
  • a fiber tuft monitoring device 3 of the device 2 according to the invention is located at this first point. The fiber tuft monitoring device 3 is set up to monitor the flow of fiber tufts for foreign materials and to determine first foreign material information relating to the foreign materials on the basis of the monitoring.
  • the first foreign matter information may be a first foreign matter rate indicating a rate of foreign matter in the fiber tufts.
  • This can e.g. B. essentially a number of foreign materials per unit mass of fiber floc (e.g. per 100 kg) or per unit time (e.g. per hour); the two figures can be converted into one another using the commonly known mass flow per unit of time (e.g. in kg/h).
  • the fiber tuft monitoring device 3 can separate foreign materials from the stream of fiber tufts according to a separation criterion.
  • a method and a device for separating foreign matter in fiber material, particularly in raw cotton, are per se z. B. from the WO-2006/079426 A1 known.
  • the fiber tuft monitoring device 3 includes a sensor system that detects properties of objects, including foreign matter, in the flow of fiber tufts.
  • the sensor system can e.g. B. include two CCD cameras that take pictures of the flow of fiber flocks; other or additional sensors are possible.
  • the sensor system is connected to a control unit, for example a computer.
  • the control unit evaluates an output signal from the sensor system and uses a rejection criterion in order to decide whether an object detected in the flow of fiber tufts is permissible or not. Depending on the result of the evaluation, it controls a separation unit Separation of foreign materials from the flow of fiber tufts.
  • the separation unit includes z. B. a plurality of compressed air nozzles that can be actuated individually by a control unit. If the control unit detects an impermissible object, it causes the compressed air nozzle located at the location of the object to eject compressed air perpendicularly to the transport direction of the flow of fiber tufts, so that the object is separated from the flow of fiber tufts.
  • Figure 12 shows a fiber event field 20 for fiber events that includes a quadrant or part of a quadrant of a two-dimensional Cartesian coordinate system.
  • a first parameter is plotted and plotted along a second axis 22, e.g. B. the ordinate, a second parameter is recorded.
  • the first parameter may relate to a geometric property of the objects in the stream of fiber tufts and is preferably a length or an area of the objects.
  • the second parameter may relate to an optical property of the objects and is preferably an intensity of light reflected from, transmitted through or absorbed by the flakes.
  • the values of the first and second parameters determined for an object define coordinates of a fiber event representing the object in the fiber event field 20.
  • a fiber event representing the object in the fiber event field 20.
  • point 23 only one fiber event is shown as point 23 by way of example; in practice, there are many such fiber events in a flow of fiber tufts, the locations of which in the fiber event field 20 generally differ from one another.
  • the fiber event field 20 of figure 2 is divided into 20 rectangular first classes 27.
  • the fiber events can be counted and their respective number can thus be determined.
  • a relative proportion of the fiber events in the respective first class 27 is determined by forming a ratio of the absolute number of fiber events in the respective first class 27 and a total number of fiber events in the entire fiber event field 20 .
  • the first foreign material portion can relate to only one or only some of the first classes 27 .
  • figure 2 also illustrates a possible separation criterion for foreign materials in a flow of fiber flocks.
  • the elimination criterion can e.g. B. in the form of a Elimination curve 26 may be specified in the fiber event field 20, as in FIG WO-2017/190259 A1 described.
  • the rejection curve 26 divides the fiber event field 20 into two mutually complementary regions: a first region 24 in which allowable fiber events reside, and a second region 25 in which invalid fiber events reside. Objects represented by fiber events in the first region 24 remain in the stream of fiber tufts, while objects represented by fiber events in the second region 25 are discarded from the stream of fiber tufts.
  • the elimination curve 26 in the two-dimensional fiber event field 20, as shown in FIG figure 2 shown is only one possible exclusion criterion for use in the present invention.
  • the elimination criterion may only consider a single parameter, e.g. B. an intensity as plotted along the ordinate 22 of the fiber event field 20.
  • the elimination criterion may consider more than two parameters, e.g. B. a geometric property and an intensity as they are plotted along the axes 21, 22 of the fiber event field 20, and additionally a color of the object.
  • the elimination criterion can be specified by an operator, taken from a database or calculated automatically.
  • the first foreign matter information may be a rejection rate.
  • This can e.g. B. indicate essentially a number of excretions per unit mass of fiber flocks (e.g. per 100 kg) or per unit of time (e.g. per hour); the two figures can be converted into one another using the commonly known mass flow per unit of time (e.g. in kg/h).
  • yarn spun from the fiber tufts is conveyed along its longitudinal direction, e.g. B. during rewinding 14.
  • a yarn monitoring device 4 of the device 2 according to the invention is located at this second point.
  • the yarn monitoring device 4 is set up to check the yarn for foreign materials to monitor and, based on the monitoring, to determine second foreign material information relating to the foreign materials.
  • the second foreign matter information may be a second foreign matter rate indicating a rate of foreign matter in the yarn.
  • the yarn monitoring device 4 can, for. B. be designed as a yarn cleaner system.
  • Yarn cleaners for monitoring a running yarn for foreign materials are known per se, e.g. B. from the US-6,244,030 B1 .
  • the yarn monitoring device 4 includes a sensor that acquires measured values of an optical measurement on a yarn section along the longitudinal direction of the yarn. It also contains an evaluation unit for determining values of a reflectivity of the yarn section measured from the measured values.
  • the evaluation unit provides a classification field for foreign materials, which is divided into at least two classes. It classifies the yarn events into at least two classes and determines the shares of yarn events in at least one of the at least two classes in a total number of foreign materials detected in the yarn.
  • the yarn event field 30 includes a quadrant or part of a quadrant of a two-dimensional Cartesian coordinate system.
  • An abscissa 31 of the coordinate system indicates an extension of reflectivity values in the longitudinal direction, e.g. B. in centimeters.
  • An ordinate 32 indicates a deviation of reflectivity values from a target value, e.g. B. Percentage.
  • the values for the extent and the deviation of the reflectivity values determined for a yarn event define coordinates of the yarn event in the yarn event field 30.
  • figure 3 is just a yarn event as point 33 drawn in; in practice there are many such events in a yarn whose locations in the yarn event field 30 differ from each other.
  • the yarn event field 30 from figure 3 is divided into 32 rectangular second classes, uniquely identified with letters and numbers AA1-F.
  • a second class AA1-F can be clearly assigned to each yarn event in the yarn event field 30 according to its position.
  • the yarn event represented by point 33 is in the second class C3.
  • the yarn events can be counted and their respective number can thus be determined.
  • a relative proportion of the yarn events in the respective second class AA1-F is determined by forming a ratio of the absolute number of yarn events in the respective second class AA1-F and a total number of yarn events in the entire yarn event field 30 .
  • the second foreign material portion can relate to only one or only some of the second classes AA1-F.
  • a cleaning curve 36 is also plotted in the yarn event field 30, which represents a cleaning limit as the boundary between permissible and impermissible foreign materials in the yarn.
  • the determined coordinates of yarn events are compared to the clearing boundary 36 and the yarn events are removed from the yarn depending on the comparison, i. H. cleaned up or not.
  • the second foreign matter information may be a cleaning rate.
  • the yarn monitoring device 4 is bidirectionally connected to a central control device 5, which is represented by an arrow 7.
  • the central control device 5 is bidirectionally connected to the fiber tuft monitoring device 3 , which is represented by an arrow 6 .
  • the data connections 6, 7 enable a bidirectional exchange of data between the devices 3, 4, 5 involved data equipped.
  • the data connections 6, 7 can be wired or wireless.
  • the central control device 5 can be implemented as a stand-alone device, e.g. B. as a computer that is in the spinning mill or outside the spinning mill. In this case, it contains appropriate receiving and transmitting means for receiving or transmitting data.
  • the central control device 5 can be integrated in another device, e.g. B. in a yarn testing device in the textile laboratory of the spinning mill, in the fiber tufts monitoring device 3, in the yarn monitoring device 4, etc. In the latter two cases, there can be a direct data connection between the yarn monitoring device 4 and the fiber tufts monitoring device 3, via which the two devices 4, 3 transmit data or exchange.
  • Further devices can be located along the connection 6 and/or 7, which receive the transmitted data, process them if necessary and send them on.
  • several fiber tuft monitors 3 are connected to a fiber tuft expert system.
  • the fiber tuft expert system is set up to receive data from the fiber tuft monitoring devices 3 , to process them and to output them in a suitable form, and to control the fiber tuft monitoring devices 3 . It is in turn connected to the central control device 5 .
  • multiple yarn monitors 4 are connected to a yarn expert system.
  • the yarn expert system is set up to receive data from the yarn monitoring devices 4, to process them and output them in a suitable form, and to control the yarn monitoring devices 4. It is in turn connected to the central control device 5 .
  • the throughput time ⁇ t is defined as the time interval during which a fiber passes through the spinning process 1 from the first point (e.g. fine cleaning 11) to the second point (e.g. rewinding 14).
  • the throughput time ⁇ t depends on a number of factors, e.g. B. the spinning process 1, the organization of the spinning mill, the raw fibers, the yarn to be produced, etc. It can be in the range of hours or days, depending on the situation.
  • the throughput time ⁇ t can be entered manually into the central control device 5 by an operator.
  • the throughput time ⁇ t can be calculated automatically by the central control device 5 .
  • the calculation can e.g. B. based on data stored in the central control device 5, z. B. the spinning process 1, the organization of the spinning mill, the raw fibers, the yarn to be produced, etc., take place.
  • the throughput time ⁇ t can be called up by the central control device 5 using inputs from a database. It can remain constant or be changed while the method according to the invention is being carried out, in which case a change can again be made manually or automatically.
  • the first proportion of foreign material and the second proportion of foreign material relate to the same sample of fiber material, ie they are determined “for the same fibers”, so to speak.
  • the first proportion of foreign material determined in this way and the second proportion of foreign material determined in this way are assigned to one another.
  • Determining the throughput time ⁇ t is only one of several possibilities for mutual assignment of the first item of foreign material information and the second item of foreign material information. Another possibility is to determine a property of the sample itself. As a property of the sample z. B. their chemical composition can be used, whereby the natural composition of the fiber by means of genetic analysis and / or an artificially added label (marker) can play a role. A further possibility for assignment consists in marking a carrier of the sample in order to track the sample in the spinning process. carrier of the sample can, depending on the nature of the sample, be cans or coil cores on which optical and/or electromagnetic markings are applied.
  • the first piece of foreign material information and the second piece of foreign material information are output to an operator at the same time.
  • the first and second pieces of foreign material information are preferably output graphically at the same time.
  • the Figures 4 and 5 show two examples thereof, where the first foreign material information is the elimination rate and the second foreign material information is the cleaning rate.
  • figure 4 shows a first example of a graphical output 40. It contains a column 41 which is divided into four evaluation areas 42-45. On both sides of the column 41 there are horizontal arrows 46, 47 whose position relative to the column 41 can be changed in the vertical direction. The left arrow 46 shows the excretion rate, the right arrow 47 the associated cleaning rate. The further down an arrow 46, 47 is, the lower the relevant rate, and vice versa.
  • the four evaluation areas 42-45 of column 41 in the traffic light colors green for appropriate (second evaluation area 43), yellow for critical (first evaluation area 42 and third evaluation area 44) and red for highly critical (fourth evaluation area 45).
  • the elimination rate is low and the purification rate is very high.
  • figure 5 shows a second example of a graphical output of the rejection rate and the purification rate.
  • This is a portfolio diagram 50.
  • the excretion rate is plotted along an abscissa 51, and the purification rate is plotted along an ordinate 52.
  • the elimination rate and the associated purification rate each form the coordinates of a point 53 in the portfolio diagram.
  • Five evaluation areas 54-58 which correspond to different evaluation categories or recommendation categories, are shown schematically in the diagram area.
  • the evaluation ranges 54-58 can be different than those in figure 5 have drawn forms.
  • the five evaluation areas 54-58 can be used in the traffic light colors green for appropriate (first evaluation area 54 and fifth evaluation area 58), yellow for critical (second evaluation area 55 and fourth evaluation area 57) and red for highly critical (third evaluation area 56). be colored.
  • the drawn point 53 lies in a first, green evaluation area 54. In this case, good raw fibers with little foreign material are obviously used, so that there is no need for action.
  • a point lying in a second, yellow evaluation area 55 would indicate a high elimination rate combined with a low cleaning rate.
  • This recommendation to the operator is indicated by an arrow 59.
  • red evaluation area 56 are both the elimination rate and the cleaning rate high, resulting in poor productivity. In this case, consideration should be given to using better, less contaminated crude fiber.
  • a point lying in a fourth, yellow evaluation area 57 would indicate a low elimination rate combined with a high cleaning rate. This corresponds to the figure 4 depicted situation. Such mismatch in rates should be balanced by increasing the rate of elimination and decreasing the rate of purification. This recommendation to the operator is indicated by an arrow 59. If a point is in the fifth, green evaluation area 58, then the rejection rate and the cleaning rate are balanced and the spinning process 1 does not need to be changed.
  • the value of the elimination rate and/or the purification rate can be given in addition to the graphic representation. This is in figure 4 the case where the two values are entered in the respective horizontal arrows 46,47. Alternatively, only the values without a graphical representation can be output to the operator.
  • the recommendation can be given in words to the operator.
  • the highly critical cases preferably not only a recommendation but also a warning or an alarm is issued to the operator. This can be done graphically or in words on a display unit of the central control unit 5 ( figure 1 ), acoustically and/or visually, e.g. B. with a warning light done.
  • the operator can make a change to the spinning process 1 manually.
  • the change to the spinning process 1 can be made automatically, e.g. B. from the central control unit 5 ( figure 1 ).
  • the boundaries of the evaluation areas 42-45, 54-58 in the Figures 4 and 5 can be set in different ways.
  • a first possibility is a requirement based on of experiences.
  • a second possibility is to determine beforehand a worldwide frequency distribution of a foreign material content in fiber tufts and/or yarns and to take this frequency distribution into account when defining the limits of the assessment areas.
  • Such a worldwide frequency distribution can e.g. B. the USTER ® STATISTICS .
  • the USTER ® STATISTICS are a compilation of textile quality data, published by the applicant of the present property right, which was determined from the worldwide production of textile raw materials, intermediate products and end products; see https://www.uster.com/en/service/uster-statistics/, retrieved at the time this property right was registered.
  • FIG 6 Another way to set the boundaries of the rating ranges 42-45, 54-58 in the Figures 4 and 5 is in figure 6 illustrated.
  • the figure shows a diagram 60 in a Cartesian coordinate system, along whose abscissa 61 a parameter influencing the elimination criterion is plotted.
  • This parameter can e.g. B. a sensitivity of the fiber flock monitoring device 3 ( figure 1 ) with respect to the light intensity, which determines the position of the excretion curve 26 ( figure 2 ) determined in the vertical direction.
  • the excretion rate is plotted along the ordinate 62 .
  • a curve 63 indicates the relationship between the sensitivity and the excretion rate.
  • Such a connection can be determined heuristically or theoretically in advance.
  • the abscissa 61 is divided into three areas 64-66. In a first area 64, the sensitivities are so low that they hardly have any effect on the excretion rate. In a third area 66, the sensitivities are very high, resulting in very high elimination rates. In a second range 65 there are medium sensitivities with medium elimination rates. A region 67 of the elimination rate corresponding to this second region 65 corresponds to the appropriate, green region 43 of the elimination rate in figure 4 . Similarly, an appropriate range for the cleaning rate can be set.
  • figure 7 shows three examples of time courses of the first foreign material information and the second foreign material information assigned to it. These two items of foreign material information are each shown in two diagrams 701, 702 arranged one above the other, with the upper diagram 701 being plotted along an ordinate 72, e.g. Legs Excretion rate E(t) and the lower diagram 702 along an ordinate 73 indicates a second foreign material fraction F(t) and the abscissa 71 is the time axis t common to the two diagrams 701, 702.
  • a first curve 74 in the upper diagram 701 indicates the time course of the first foreign material information
  • a second curve 75 in the lower diagram 702 indicates the time course of the second foreign material information.
  • the elimination criterion is changed at a first point in time ti in such a way that a higher elimination rate E(t) results. As expected, this should have the result that at a second point in time t 2 , which is later than the first point in time t 1 by the throughput time ⁇ t, the second proportion of foreign material F(t) falls. If, on the other hand, the separation criterion is changed in such a way that a lower separation rate E(t) results, then the second foreign material fraction F(t) should increase later by the throughput time ⁇ t.
  • figure 8 illustrates a further embodiment of the method according to the invention. In this embodiment, costs are taken into account.
  • Figure 8(a) shows a diagram 801 in a Cartesian coordinate system, along whose abscissa 81 the precipitation rate E is plotted and along whose ordinate 82 the cleaning rate C(E) is plotted.
  • a curve 83 schematically shows a possible connection between the elimination rate E and the purification rate C(E).
  • Such a relationship C(E) can be determined heuristically or theoretically.
  • the costs K E for an elimination and the costs K C for a cleaning process can also be determined heuristically or theoretically.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP20704380.3A 2019-01-31 2020-01-23 Optimierung eines spinnprozesses bezüglich fremdmaterialien. Active EP3918119B1 (de)

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CH1062019 2019-01-31
CH1582019 2019-02-08
PCT/CH2020/000002 WO2020154820A1 (de) 2019-01-31 2020-01-23 Optimierung eines spinnprozesses bezüglich fremdmaterialien.

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EP3918119B1 true EP3918119B1 (de) 2023-06-28

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EP3918119A1 (de) 2021-12-08
US20220090302A1 (en) 2022-03-24
CN113396252B (zh) 2024-03-15
JP7496828B2 (ja) 2024-06-07
JP2022518593A (ja) 2022-03-15
CN113396252A (zh) 2021-09-14

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