WO2007073784A1 - Procede et dispositif pour surveiller la production de corps creux sans fin tels que des filaments et des faisceaux de filaments - Google Patents

Procede et dispositif pour surveiller la production de corps creux sans fin tels que des filaments et des faisceaux de filaments Download PDF

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Publication number
WO2007073784A1
WO2007073784A1 PCT/EP2006/009087 EP2006009087W WO2007073784A1 WO 2007073784 A1 WO2007073784 A1 WO 2007073784A1 EP 2006009087 W EP2006009087 W EP 2006009087W WO 2007073784 A1 WO2007073784 A1 WO 2007073784A1
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WO
WIPO (PCT)
Prior art keywords
monitoring
area
continuous molding
image
continuous
Prior art date
Application number
PCT/EP2006/009087
Other languages
German (de)
English (en)
Inventor
Dirk Rechtziegel
Helmut Höglinger
Original Assignee
Lurgi Zimmer Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lurgi Zimmer Gmbh filed Critical Lurgi Zimmer Gmbh
Publication of WO2007073784A1 publication Critical patent/WO2007073784A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
    • G01N21/8915—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined non-woven textile material
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D13/00—Complete machines for producing artificial threads
    • D01D13/02—Elements of machines in combination

Definitions

  • the invention relates to a production plant for at least one continuous molding such as a filament or a filament bundle, a retrofit kit for monitoring such production equipment and a method for controlling the production process of at least one such continuous molding.
  • Production systems for producing the continuous molded articles usually have a transport path, along which the endless molded articles are moved in a transport direction through various processing stations up to a cutting station. If the continuous molded articles are damaged on their way through the transport path, the damage of individual machines threatens the processing of the continuous molded articles, if these depend on a high degree of uniformity of the continuous molded articles in the transport path.
  • filaments or a filament bundle consisting of a multiplicity of filaments are produced from synthetic polymers, such as polyester, but also cellulosic filaments, for example from cellulose solutions
  • filaments break off which happens, for example, when spinnerets are clogged or the filaments or filament bundles shift on the godets along the transport path.
  • This can lead to problems, in particular, when the filaments or filament bundles are crimped, since the crimper can fail in the event of an abrupt change in the thickness of the filament or of the filament bundle.
  • filaments can adhere to the godets, so that a winding is formed, which leads to a halt of the entire production plant in order to be able to be removed mechanically. Due to the extremely smooth surface of the godets there is always the danger that the godets will be damaged.
  • the object of the invention is to improve the monitoring of the production of continuous moldings, such as filaments or filament bundles, so that the uniformity of the continuous molding can be monitored without high costs and subsequent processing steps, for which a high uniformity of the filament bundle or filaments necessary, can be protected from damage. In particular, a loss of production resulting from stopping the entire production plant should be prevented.
  • This object is achieved in a production plant of the type mentioned above in that a camera system, which is directed in operation on a, a monitoring area forming part of the transport section and a monitoring image representing the monitoring area is generated during operation, an evaluation unit connected to the camera system by which a control signal is generated during operation depending on the area occupied by at least one continuous molding in the monitoring image, and a control device is provided, by which during operation in response to the control signal, the transport speed of the transport path is set.
  • a retrofit kit for monitoring equipment for the production of at least one continuous molding wherein the retrofit kit is a camera system through which an image signal can be generated during operation, which is representative of an image of the at least one endless body transported past the camera system.
  • an evaluation unit by means of which a monitoring signal can be generated in operation from the image signal, which is representative of the area occupied by the at least one continuous molding in the image, and has an interface device by which the monitoring signal can be converted into a speed signal for a motor control.
  • the object is finally achieved in that a monitoring image of the monitoring area is created with the continuous molding and continuously updated, a value representative of the surface occupied by the at least one continuous molding in the surveillance image is calculated from the monitoring image and the transport speed in Dependence on the value is set.
  • the production plant according to the invention, the retrofit kit according to the invention and the method according to the invention are based on the common idea that a continuously updated monitoring image is generated by the stationary monitoring area, which contains the at least one continuous molding. Since at least one continuous molded article is transported through the surveillance area at transport speeds of up to 350 m / min, the evaluation of the monitored area must not involve any calculating and time-consuming steps leading to an unnecessary delay.
  • This is achieved according to the invention in that a simple representative of the area occupied by the continuous molding in the monitoring image Value is determined and the transport speed is set depending on this value and thus the area.
  • the determination of the area occupied by the at least one continuous molding in the monitoring image or of a value representative thereof has surprisingly been found to be very suitable for quickly detecting a disturbance in the transport path.
  • the filament bundle has a gap which arises because individual filaments or filament bundles are glued to a preceding transport direction of the at least one endless molded article arranged in front of the monitoring area and there forms the formation of a Wickels begins.
  • the area filled by the filament bundle in the monitoring image is reduced due to the defect.
  • the transport speed of the continuous molding can be reduced by the production facility, so that the winding can be removed by the operating personnel during operation. Since the defect in the monitoring image makes itself noticeable much earlier than in the wrap-around monitors used hitherto, there is no longer any danger for the crimper or other devices connected downstream of the monitoring area. In particular, the system does not have to be shut down due to the fast reaction times of the system.
  • the determination of the area occupied by the continuous molding or surface area can be carried out in a simple manner, in particular by counting the number of pixels occupied by the continuous molding or by the background in the monitoring image.
  • the pixels of the continuous molding and of the background can be clearly distinguished in an advantageous embodiment in that the background of the continuous molding is provided with a contrasting color in relation to the continuous molding bodies, in which connection also black and white can be used as a pair of contrasting colors. see are. For example, many fibers are colored white or white, so that they stand out against a black background in the surveillance image.
  • the solution according to the invention can also detect the case that the filament bundle shifts laterally on the godets and, for example, the inlet of the filament bundle in the crimper is no longer uniformly distributed over its entrance but instead enters on one side a thicker layer than at the other.
  • the filament bundle travels laterally out of the monitoring image so that the area occupied by the filament bundle in the monitoring image also decreases.
  • the monitoring area in the direction transverse to the transport direction by an amount that is tolerable at a trouble-free operation be greater than the width of the filament bundle in this direction.
  • a lateral migration of the at least one continuous molded article can also be achieved by counting the pixels assigned to the background which lie beyond the two lateral edges of the continuous molded article in the monitoring image.
  • the transport speed of the at least one continuous molded article can be automatically reduced only when the surface occupied by the continuous molded article in the monitoring image falls below a predetermined limit value.
  • the production plant when it falls below a second limit value, which is smaller than the first limit value, can also be switched off automatically in order to avoid greater damage.
  • the second limit may be such as to indicate a serious disturbance, such as tearing a plurality of filaments or bundles of filaments on the godets.
  • the transport speed of the production plant can be automatically increased again after a previous reduction, if a further, upper limit of the surface of the continuous molding in the monitoring image is exceeded.
  • this limit value may also be equal to the lower limit value from which the transport speed of the production plant is reduced.
  • the upper limit is slightly greater than the lower limit, so that forms a hysteresis.
  • relative limit values could also be used instead of one or more absolute limit values.
  • the transport speed can only be reduced if the surface of the endless molded article in a monitoring image changes by a predetermined amount relative to the surface in one or more preceding monitoring images.
  • each monitoring region being uniquely associated with a filament bundle. From each monitoring area, a continuously updated monitoring image is generated and evaluated independently of other monitoring images. The transport speed of each filament bundle associated with this monitoring image is set independently as a function of its area in the monitoring image.
  • a light source directed to the monitoring area can be provided, in particular a stroboscopic light source synchronized with the update period of the surveillance image, so that the brightness of the continuous molding in the surveillance area is increased compared to the background.
  • the background should be shaded.
  • the light source can also be aimed at the background when the continuous molded body is shaded so that it appears brighter.
  • Another measure could be to use colored light sources and monitor the recording image through a filter that blocks frequencies other than those of the light source.
  • the monitoring image is averaged from a plurality of preferably directly successive individual images, so that for the subsequent processing of the filament bundle insignificant short-term fluctuations and white noise in the individual images are averaged.
  • Fig. 1 is a schematic view of a production plant for continuous molding
  • FIG. 2 shows a detail II of the production plant of FIG. 1;
  • Figs. 3A to 3C are examples of monitor images
  • FIG. 4 shows an exemplary distribution of the brightness values in a monitoring image.
  • FIG. 1 shows a schematic representation of a production plant 1 for the production of continuous molded articles 2, for example a polyester spinning plant.
  • the at least one continuous molding 2 is a filament bundle of a plurality of individual polyester filaments 3 spun at a plurality of spinning stations 4.
  • the filament bundle 2 consists of several thousand to several millions of individual filaments 3, which by means of Galet th 5 are transported over a transport path 6 with a series of processing stations before the filament bundle 2 are crimped in a crimper 7 and then cut into staple fibers in a cutting device 8 and pressed in a baler 9 to bales 10 of staple fibers.
  • the bales 10 are transported out of the production plant 1, as symbolized by the truck 11, and supplied to the processing industry, such as the textile industry.
  • the individual filaments 3 are connected by spinning means 12 to the filament bundle 2 after spinning.
  • a take-off device 13 generates the tension necessary for the drawing of the individual filaments 3 at the spinning stations 4.
  • the filament bundle 2 is then passed through an immersion bath 14, a further draw-off device 15 and a drawing bath 16 to a further draw-off device 17. Subsequently, the fiber cable 2 is passed through a steam chamber 18 to a thermosetting unit 19 with heated godets 20 and then cooled in a cooling device 21. By means of a further removal device 22, the filament bundle 2 is then transported to the crimper 7.
  • the crimped fiber cable 23 is passed on a sloping beam 24 to a drying device 25, in which it lies on a conveyor belt 26.
  • the crimped filament bundle 23 is finally cut in the cutting device 8 into staple fibers having a fiber length of predetermined length, for example in the range between 20 and 50 mm.
  • the production plant 1 shown in FIG. 1 can be provided with monitoring systems 27 in several places, which monitor the uniformity of the filament bundle 2.
  • monitoring systems 27 may be arranged in the transport direction T behind the thermosetting unit 19 and in front of the crimper 7.
  • FIG. 2 schematically shows the structure of a monitoring system 27.
  • the monitoring system 27 has a camera system 28 and an evaluation unit 29.
  • the camera system 28 is directed to the transported with a transport speed T filament bundle 2, wherein the image portion 30 of the camera system 27 defines a monitoring area. As shown in Fig. 2, the filament bundle 2 is transported through the monitoring area 30 so that it is detected in its full width transverse to the transport direction.
  • the camera system 28 is preferably a digital camera system which generates a continuously updated monitoring image of the surveillance area 30, which is present as a digital image signal.
  • the evaluation unit 29 is data-transmitting connected to the camera system 28 and receives the surveillance image of the camera system 28 in waveform.
  • the monitoring image is first passed through a filter module 31, which improves the quality of the monitoring image.
  • a filter module 31 improves the quality of the monitoring image.
  • the filter module 31 from a predetermined number of successive images of the monitoring area 30, a single monitoring image can be calculated, which has a reduced noise component. This can easily be done by calculating an average value from these images.
  • the area occupied by the filament bundle 2 is calculated in a calculation module 32. This is done in a simple manner in that the pixels are assigned to the fiber cable 2 or a background 33 arranged behind the fiber cable with respect to the camera system 28 in the monitoring image.
  • the background 33 is preferably provided with a contrasting color to the fiber cable 2. For example, if the fiber cable 2 is white, the background 33 is black and vice versa.
  • the background 33 preferably has the complementary color. be on.
  • the filament bundle 2 can be illuminated by a light source 34, while the background 33 remains unlit, so that the fiber cable 2 stands out bright against the background 33.
  • the background 33 may also be illuminated and the fiber cable 2 may be shaded, so that the fiber cable 2 lifts off dark against the light background 33.
  • a value representative of the area of the filament bundle 2 in the monitoring area 30 is determined. This is done, for example, by assigning the individual pixels to either the background 33 or the filament bundle 3 via a criterion such as the brightness value. Pixels which are, for example, in their color and / or brightness value beyond a predetermined limit: are uniquely associated with the filament bundle 2 or the background 33. If, for example, the filament bundle 2 is brightly lit and the background 31 is dark, only those pixels which exceed a brightness limit value are assigned to the filter bundle.
  • the area of the filament bundle 2 in the surveillance area 30 is representatively determined by counting the pixels associated with the filament bundle 2: If the brightness or color of a pixel exceeds the predetermined brightness threshold, a counter is incremented.
  • the number of pixels assigned to the background can also be counted without this having to lead to a different result if the background and filament bundles fill the entire surveillance image.
  • the number of pixels thus determined is then representative of the area occupied by the filament bundle 2 in the monitoring image.
  • the average brightness of the surveillance image may also be taken as a representative value for the area of the filament bundle.
  • this requires very constant lighting conditions.
  • the transport speed is reduced to zero by the control signal output by the interface 37, so that the production facility stop.
  • the quality of the monitoring image can be improved by further measures, for example by the light source 34 operating as a stroboscopic light whose light sequence is synchronized with the update period recorded by the camera system 28 monitoring images.
  • the light source 34 and the camera system 28 can be provided with filters 40, which in each case allow only light to pass at a specific frequency and thus exclude spurious components in the monitoring image of extraneous light sources.
  • FIG. 3A shows the filament bundle 2, which consists of a multiplicity of individual filaments 4, in front of the contrast background 33.
  • the filament bundle 2 is transported through the monitoring area 30, which extends in both directions transversely to the transport direction T over the edge of the filament bundle 2.
  • the region D over which the monitoring region 30 corresponds beyond the edges of the filament bundle preferably corresponds to one in the normal one Operating state allowed position variation of the fiber cable 2 on the godets 5 (see Fig. 2).
  • the surveillance image taken by the camera system 28 corresponds to the surveillance area 30.
  • the surveillance image is composed of individual pixels 41; As shown schematically in FIG. 3A, the surveillance image composed of pixels is designated by reference numeral 42.
  • the area occupied by the filament bundle 2 in the monitoring image 42 is determined in the Ü monitor image, for example, by the number of either the filament bundle 2 or the background 33 pixels. If there are several individual filaments 4 within the filament bundle 2, the background 33 appears to pass through the filament bundle 2, as is schematically illustrated, for example, at the defect 43 in FIG. 3A. Since small imperfections 43 can not lead to damage of downstream processing points, reductions of the area occupied by the filament bundle 2 in the surveillance area 30 are acceptable up to a predetermined limit value.
  • the threshold may be given either absolutely in a number of pixels, for example, 1500 pixels, or relatively as a ratio of the determined number of pixels to a predetermined number of pixels representing a surveillance image without interference.
  • the undershooting of the limit value for the area occupied by the fiber cable 2 in the monitoring area 30 results from a large damaged area 44, which indicates a large winding at a godet lying in the transport direction T in front of the monitoring area 30.
  • the transport speed of the fiber tow 2 is reduced by a certain amount, for example 50%, so that the operator can locate the godet and remove the reel from the godet without disturbing the production line.
  • Anläge 1 (see Fig. 1) must be stopped. If, however, the damaged area 44 is so large that the area occupied by the filament bundle 2 in the monitoring area 30 falls below a further limit value which is below the first limit value, or if there are a large number of damaged areas 43, 44, the production facility 1 is stopped to cause greater damage to avoid.
  • Falling below the limit for the area occupied by the filament bundle 2 in the monitoring area 30 may also result from a lateral migration of the filament bundle 2 out of the monitoring area 30, as shown in FIG. 3C.
  • the monitoring area only detects a part of the filament bundle 2 in the case of laterally migrated filament bundles 2, so that its area in the monitoring area 30 is reduced.
  • the transport speed of the production plant 1 is merely reduced.
  • the area occupied by the filament bundle 2 in the surveillance area 30 will continue to decrease and may sink below the second limit value by shutting down and re-adjusting the production facility.
  • the monitoring of the central position of the filament bundle 2 in the monitoring image 42 can additionally take place by counting the pixels lying within the distance D to one or both sides of the filament bundle and, for example, forming an average value or the one of these pixels on one or both sides occupied area is determined as a representative of the central position of the filament bundle 2 value. If one side falls below a lower or upper limit for the number of pixels, this is considered to be an excessive lateral migration of the filament bundle 2 and the transport speed of the filament bundle is reduced.
  • the monitoring system 27 can be designed as a retrofit kit with which existing production facilities can be retrofitted.
  • the interface device 37 serves as an adapter, by which the motor control 38 of the production plant 1 can be controlled.
  • a plurality of monitoring systems 27 can be operated in parallel and independently of each other.
  • Each monitoring device 27 is associated with a filament bundle and independently controls its transport speed.
  • the monitoring system 27 and the method carried out by it can also be used for monitoring a material web, for example a film web, or a single filament 3.
  • a material web for example a film web, or a single filament 3.
  • the monitoring area 30 must be selected to be correspondingly small, otherwise it is possible with the inventive design of the monitoring system 27 to monitor changes in thickness and lateral migration of a single filament as well as in a filament bundle or a material web.
  • the brightness value H is, for example, the gray value of a pixel or else the brightness value of a specific color in the monitoring image.
  • FIG. 4 shows, for example, a number of N 1 -PiXeI with the brightness value Hi and a number of N n pixels with the brightness value H n in the monitoring image 42. Because of the contrast background 33, there are two clearly delimited regions 45, 46 a significantly increased pixel number, which are separated from a region 47 with a significantly reduced pixel number at the high and low brightness values.
  • region 45 may be determined by calibration of the system and determine whether a pixel is assigned by the evaluation unit to the background 33 or the filament bundle 2.
  • the area 45 may also coincide to a single limit.

Abstract

La présente invention concerne une installation de production (1) qui sert à produire des corps creux sans fin tels que des filaments, des faisceaux de filaments et des bandes de matière, comprenant un système de surveillance. L'invention a également pour objet un complément d'équipement destiné à une installation de production de ce type, ainsi qu'un procédé pour surveiller l'installation de production. Le corps creux sans fin (2) est acheminé à travers une zone de surveillance (30). La zone de surveillance (30) est surveillée par un système de surveillance (27) qui produit des images de surveillance actualisées en continu qui sont évaluées au moyen d'une unité d'évaluation (29). L'unité d'évaluation (29) détermine la surface occupée par le corps creux sans fin (2) dans la zone de surveillance (30), et régule la vitesse d'acheminement du corps creux sans fin (2) en fonction cette surface. La vitesse d'acheminement peut en particulier être réduite lorsque la surface du corps creux sans fin (2) dans la zone de surveillance (30), déterminée par l'unité d'évaluation (30), devient inférieure à une valeur seuil prédéterminée.
PCT/EP2006/009087 2005-12-27 2006-09-19 Procede et dispositif pour surveiller la production de corps creux sans fin tels que des filaments et des faisceaux de filaments WO2007073784A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005062826.5 2005-12-27
DE200510062826 DE102005062826A1 (de) 2005-12-27 2005-12-27 Verfahren und Vorrichtung zur Produktionsüberwachung von Endlosformkörpern wie Filamenten und Filamentbündeln

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WO2007073784A1 true WO2007073784A1 (fr) 2007-07-05

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WO (1) WO2007073784A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016110536A1 (fr) 2015-01-09 2016-07-14 Oerlikon Textile Gmbh & Co. Kg Procédé et dispositif de surveillance de la qualité d'une pluralité de brins de fibre filés à l'état fondu d'un câble à fibres
WO2016113176A1 (fr) * 2015-01-14 2016-07-21 Oerlikon Textile Gmbh & Co. Kg Procédé et dispositif de traitement thermique d'une pluralité de stratifils filés par fusion d'un câble de fibres
CN114084737A (zh) * 2021-11-24 2022-02-25 沃逸新能源科技（江苏）有限公司 一种毛细管能量网组加工用放料装置

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
DE102008060852A1 (de) * 2008-12-06 2010-06-17 Teijin Monofilament Germany Gmbh Bündel aus bioabbaubaren Monofilamenten und deren Verwendung in Wasserbauwerken
US10300635B2 (en) 2014-02-18 2019-05-28 Kordsa Global Endüstrivel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi Fiber production system and production method
WO2022112261A1 (fr) 2020-11-25 2022-06-02 Oerlikon Textile Gmbh & Co. Kg Procédé de surveillance d'une installation de machine et installation de machine pour la production de fibres discontinues synthétiques

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GB2066455A (en) * 1979-12-12 1981-07-08 Stanley Electric Co Ltd Apparatus for inspecting whether an object is good or bad
EP0450564A1 (fr) * 1990-04-04 1991-10-09 Hoechst Aktiengesellschaft Procédé et dispositif pour guider un câble de filaments
EP0500467A1 (fr) * 1991-02-20 1992-08-26 Rollin S.A. Procédé de contrôle en continu d'une bande sans fin et machine pour la mise en oeuvre de ce procédé
EP0687902A1 (fr) * 1994-06-15 1995-12-20 Kodak-Pathe Méthode et dispositif pour le comptage et la caractérisation de défauts sur un support photographique
JPH0890184A (ja) * 1994-09-19 1996-04-09 Nippon Steel Corp 鋳片疵防止装置および方法
US5642198A (en) * 1995-04-03 1997-06-24 Long; William R. Method of inspecting moving material

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Publication number Priority date Publication date Assignee Title
GB2066455A (en) * 1979-12-12 1981-07-08 Stanley Electric Co Ltd Apparatus for inspecting whether an object is good or bad
EP0450564A1 (fr) * 1990-04-04 1991-10-09 Hoechst Aktiengesellschaft Procédé et dispositif pour guider un câble de filaments
EP0500467A1 (fr) * 1991-02-20 1992-08-26 Rollin S.A. Procédé de contrôle en continu d'une bande sans fin et machine pour la mise en oeuvre de ce procédé
EP0687902A1 (fr) * 1994-06-15 1995-12-20 Kodak-Pathe Méthode et dispositif pour le comptage et la caractérisation de défauts sur un support photographique
JPH0890184A (ja) * 1994-09-19 1996-04-09 Nippon Steel Corp 鋳片疵防止装置および方法
US5642198A (en) * 1995-04-03 1997-06-24 Long; William R. Method of inspecting moving material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016110536A1 (fr) 2015-01-09 2016-07-14 Oerlikon Textile Gmbh & Co. Kg Procédé et dispositif de surveillance de la qualité d'une pluralité de brins de fibre filés à l'état fondu d'un câble à fibres
CN107209127A (zh) * 2015-01-09 2017-09-26 欧瑞康纺织有限及两合公司 对丝束的多个熔纺的纤维条子进行质量监控的方法和设备
WO2016113176A1 (fr) * 2015-01-14 2016-07-21 Oerlikon Textile Gmbh & Co. Kg Procédé et dispositif de traitement thermique d'une pluralité de stratifils filés par fusion d'un câble de fibres
CN114084737A (zh) * 2021-11-24 2022-02-25 沃逸新能源科技（江苏）有限公司 一种毛细管能量网组加工用放料装置

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