EP0464417B1 - Procédé pour la surveillance de la régularité de rubans - Google Patents

Procédé pour la surveillance de la régularité de rubans Download PDF

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Publication number
EP0464417B1
EP0464417B1 EP91109636A EP91109636A EP0464417B1 EP 0464417 B1 EP0464417 B1 EP 0464417B1 EP 91109636 A EP91109636 A EP 91109636A EP 91109636 A EP91109636 A EP 91109636A EP 0464417 B1 EP0464417 B1 EP 0464417B1
Authority
EP
European Patent Office
Prior art keywords
tow
cable
tension
monitoring
signal
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.)
Expired - Lifetime
Application number
EP91109636A
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German (de)
English (en)
Other versions
EP0464417A1 (fr
Inventor
Bernd Dr. Huber
Richard Dr. Neuert
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.)
Hoechst AG
Original Assignee
Hoechst AG
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 Hoechst AG filed Critical Hoechst AG
Publication of EP0464417A1 publication Critical patent/EP0464417A1/fr
Application granted granted Critical
Publication of EP0464417B1 publication Critical patent/EP0464417B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 relates to a method for monitoring or measuring the uniformity of spun fiber cables by mechanical probes in the course of the cable production on the belt line.
  • Post-treatment steps that are usually required include e.g. in stretching, fixing, crimping and, if necessary, cutting the continuous filaments into staple fibers.
  • These post-treatment steps are usually carried out in technology on so-called belt mills by first combining the filament array of many spinnerets into a spinning cable and depositing it in cans and then in turn folding a large group of these spinning cables and jointly carrying out the above on a belt mill.
  • Subsequent treatment steps such as fixing, curling, etc. subject.
  • the spun fiber cables simultaneously treated in this way contain a very large number, usually a few hundred thousand to a few million individual filaments.
  • a uniform cable quality in particular a constant number of filaments, is crucial, particularly for the production of spun fiber cables which are then to be further processed as so-called converter cables, tear cables or filling fiber cables. Every change in the cable thickness leads to an irregularity in the end product, which is equivalent to a loss of quality.
  • Devices that serve this purpose are known for example from DE-AS-21 44 104, DE-OS-24 00 293 or German Patent No. 11 208.
  • the devices known from DE-AS-21 44 104 and DE-OS-24 00 293 work with tracer rollers which scan the thickness of the fiber cable.
  • a so-called feeler saddle is used for this purpose, which is to be thrown up by thick points of the cable.
  • DE-OS 33 06 687 describes a device for bringing together several partial cables of a synthetic fiber cable in front of the crimping chamber by means of pivotable deflecting rollers, which has cable tension measuring and regulating units. This measurement of the cable tension is used exclusively for the automatic regulation of the discharge rollers, so that the merging of the partial cables is optimized. The device is not used to record the quality of the partial cables.
  • CH-A-346 142 relates to a method for the uniform stretching of fiber cables and fiber ribbons.
  • a cable parameter determined by the extent of the stretching namely either the stretching tension or the cable titer or the thickness, is measured directly and any deviations from the setpoint value are used to generate a signal which is fed back to the drafting system in order to increase the extent of the stretching change so that the nominal value of the cable titer is restored.
  • the document gives no indication that hidden irregularities in the cable lead to a change in the tension of the cable upstream of the transport rollers even outside of drafting systems when they pass through transport roller arrangements.
  • the present invention provides a method with which the quality of a synthetic fiber cable can be monitored and, if necessary, evaluated. It has been found that, surprisingly, this problem can be solved by continuously monitoring the mechanical tension of the synthetic fiber cable.
  • An object of the present invention is therefore a method for monitoring or measuring the uniformity of spun fiber cables by mechanical probes during production on the belt line, in which isolated cable faults are localized indirectly by monitoring the cable for voltage changes that occur upstream, while the disturbances happen roller arrangements that transport the cable at a defined speed (transport roller arrangements).
  • the frequency and extent of the changes in tension serve as a measure of the uniformity of the fiber cable.
  • Roller assemblies which are used to transport cables at a defined transport speed on conveyor belts, are designed so that the cable running over the rollers practically assumes the peripheral speed of the transport rollers due to friction on the roller surface.
  • Roller arrangements that can give a cable a defined speed therefore contain two or more - common are, for example, up to seven rollers (so-called septets) - rollers that are either arranged so that they pass the cable one after the other with the greatest possible wrap angle or they are designed as pairs of squeeze rollers.
  • septets rollers
  • Pinch roller pairs consist of a fixed roller and a movable roller that presses on the fixed roller with great pressure.
  • the cable to be transported is drawn into the nip of the pair of nip rollers and transported at the peripheral speed of the nip rollers. This results in front of the nip rolls, i.e. upstream of it, a cable voltage resulting from the overall construction of the cable route that fluctuates statistically around a normal value in normal operation.
  • Roller arrangements that can convey a defined transport speed to a cable are referred to below as transport roller arrangements.
  • Transport roller arrangements can be found on many cable treatment devices as feed rollers e.g. on dryers, crimping chambers, tear lines, cutting machines etc.
  • the measurement of the mechanical cable tension is therefore preferably carried out in a measuring area located in front of the feed rollers of a cable treatment unit, for example a tear line or a stuffer box, which is equipped with a tension measuring device of known type. If there is a fault in the synthetic fiber cable in the form of a thicker or weaker cable piece in the feed rollers (transport roller arrangement) of the monitored unit, this fault shows up as a change in the cable tension in front of the feed rollers, which can be measured well with tension sensors known per se. If the transport roller arrangement consists of a roller multiplet, a malfunction in the form of a thickening of the cable leads to an increase in tension, and a thin point of the cable leads to a decrease in tension.
  • the transport roller arrangement consists of a pair of squeeze rollers
  • a thickening of the fiber cable as it passes through the nip leads to an increase in tension
  • a thin point of the cable leads to a decrease in tension if the cable is also downstream of the pair of squeeze rollers Tension is there.
  • the cable downstream of the pinch roller is no longer under tension, which is the case, for example, behind the feed rollers of a stuffer box (crimping chamber)
  • the effects are reversed: a thickening of the cable leads to a drop in voltage, a thin point provokes a rise in tension.
  • the measurement results can be evaluated in various ways, depending on which information about the cable quality is desired. If, for example, defects in the cable are to be excluded before further processing, a positive or negative change in voltage can be used, for example, to switch off the cable transport. If the faulty point is to be removed from the product stream at a suitable point, it can be signed, for example, when the voltage change occurs.
  • the voltage signal can also start a timer, for example, which controls the removal of the defective product depending on the cable speed. For example, one can change the voltage
  • the alarm signal triggered is used to switch on a signal lamp in the region of the cable treatment device downstream of the pair of rollers, for example the crimping machine, which indicates to the operator that an intolerable cable fault has occurred.
  • a signal can be triggered in the area of the cable stapler and after the fault has passed through the fixer, a signal can be triggered in front of the cutting machine, which enables the can filling to be interrupted in good time and the non-conforming production parts resulting from the cable irregularity to be discharged.
  • the signal generated by the voltage change can also be used to mark the point of impurity of the spun fiber cable with a marking dye.
  • the non-conforming production parts can then be removed by hand or automatically, for example in front of the cable tray or on the cutting machine.
  • the method according to the invention is not only suitable for triggering certain alarm devices or fault measures in the event of faults in the spun fiber cable, but the voltage changes can also be counted or integrated according to frequency and / or extent.
  • the measured value obtained in this way can be normalized to the unit of the running time or running length of the cable and then represents a measure of the average cable quality in the measurement interval.
  • any change in the strength of the spun fiber cable can be continuously monitored on a recorder.
  • a limit value of the analog signal can be set at which the above-described accident measures are triggered.
  • the measurement of the cable tension can be continuous, i.e. be carried out without interruption, whereby a voltage signal is obtained which can be used for constant control of the cable quality.
  • the measurement can also be carried out intermittently at short intervals. This embodiment is advantageous when e.g. a single evaluation and control device is provided for several measuring points. The evaluation computer then works as it were in the time sharing process.
  • the evaluation of the signal sequence for determining the cable quality is expediently carried out by a computer which can output the results in real time and thus enables process control if desired.
  • All known measuring devices for mechanical tension of spun fiber cables are suitable for carrying out the method according to the invention.
  • Devices which work with a dancer roller ie a movable roller which rests under pressure on the cable and are arranged between two fixed rollers, are particularly suitable.
  • the dancer roller can be controlled in different ways, for example it is possible to have the dancer roller form a relatively long loop of the cable, so that the cable wraps around the dancer roller at approximately 180 °.
  • the dancer roll is in this position held by spring force, so that any change in tension of the cable leads to a change in position of the dancer roller.
  • the change in position of the dancer roller is then converted in a manner known per se into an electrical analog or digital signal and further processed in the manner described above.
  • a dancer roller can also be operated, for example, in such a way that it is held in a position by a constantly measured force, in which it deflects the running synthetic fiber cable only relatively slightly, for example by an angle between 20 and 45 °.
  • the force required to maintain this position is continuously measured and converted in a manner known per se, for example by an electronic tensiometer, into an electrical signal which is evaluated as described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (5)

  1. Procédé pour contrôler ou mesurer l'uniformité de câbles formés de fibres textiles, au moyen d'organes mécaniques de palpage pendant la fabrication dans la chaîne de fabrication de bande, caractérisé en ce qu'on détermine l'uniformité du câble formé de fibres ou on localise indirectement des défauts isolés du câble en contrôlant des variations de tension du câble transporté avec une vitesse définie, variations qui apparaissent en amont, c'est-à-dire directement en amont des dispositifs à rouleaux de transport, alors que les défauts passent devant ces dispositifs à rouleaux de transport.
  2. Procédé selon la revendication 1, caractérisé en ce qu'on mesure la tension en amont des rouleaux d'entrée d'un dispositif de traitement de câble.
  3. Procédé selon au moins l'une des revendications 1 et 2, caractérisé en ce que pour la tension des câbles, on fixe par avance une valeur de seuil positive ou négative, dont le dépassement déclenche des dispositions à prendre en cas d'incident.
  4. Procédé selon au moins l'une des revendications 1 à 3, caractérisé en ce que la fréquence et/ou l'étendue des variations de tension, de préférence celles qui apparaissent à l'extérieur de la fenêtre des valeurs de seuil, est comptée ou intégrée et que cette valeur est délivrée, éventuellement après normalisation par rapport à l'unité de temps ou une longueur de défilement du câble pendant l'intervalle de mesure en tant que caractéristique de qualité du câble.
  5. Procédé selon au moins l'une des revendications 1 à 4, caractérisé en ce qu'on utilise le signal délivré par la tête de mesure après une amplification usuelle suffisante, pour allumer une lampe témoin au voisinage du dispositif de traitement de câble, disposé en aval du couple de rouleaux, et/ou au niveau du dispositif de pliage du câble et, après une durée de passage correspondante du défaut dans le dispositif de fixage, déclencher en amont de la machine de coupe un signal qui permet d'écarter des parties de la production, dont le type n'est pas conforme.
EP91109636A 1990-06-19 1991-06-12 Procédé pour la surveillance de la régularité de rubans Expired - Lifetime EP0464417B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4019469A DE4019469A1 (de) 1990-06-19 1990-06-19 Verfahren zur ueberwachung der gleichmaessigkeit von spinnfaserkabeln
DE4019469 1990-06-19

Publications (2)

Publication Number Publication Date
EP0464417A1 EP0464417A1 (fr) 1992-01-08
EP0464417B1 true EP0464417B1 (fr) 1997-04-02

Family

ID=6408638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91109636A Expired - Lifetime EP0464417B1 (fr) 1990-06-19 1991-06-12 Procédé pour la surveillance de la régularité de rubans

Country Status (6)

Country Link
US (1) US5490308A (fr)
EP (1) EP0464417B1 (fr)
JP (1) JPH04250333A (fr)
DE (2) DE4019469A1 (fr)
IE (1) IE912089A1 (fr)
PT (1) PT98024B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19906139B4 (de) * 1999-02-13 2008-01-10 TRüTZSCHLER GMBH & CO. KG Regulierstreckwerk für einen Faserverband, z. B. Baumwolle, Chemiefasern o. dgl., mit mindestens einem Verzugsfeld
DE19953541A1 (de) * 1999-11-08 2001-05-10 Kmf Messtechnik Und Verwaltung Meßmaschine zum Messen von Zug- und Druckkräften
DE10057699A1 (de) * 2000-11-21 2002-05-23 Truetzschler Gmbh & Co Kg Vorrichtung an einer Strecke zur Verarbeitung von Faserbändern, z. B. Baumwolle, Chemiefasern u. dgl.
CN113252225A (zh) * 2021-04-13 2021-08-13 武汉纺织大学 一种集束张力检测系统

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126579A (en) * 1964-03-31 Apparatus for the measurement and control of the
US2930102A (en) * 1954-01-22 1960-03-29 British Celanese Tension control
GB821023A (en) * 1955-04-01 1959-09-30 Linen Ind Res Ass Improvements in the drafting of textile fibres
US3231958A (en) * 1964-01-20 1966-02-01 Du Pont Apparatus for guiding a textile tow
SU941439A1 (ru) * 1980-03-26 1982-07-07 Ленинградский научно-исследовательский институт текстильной промышленности Датчик линейной плотности волокнистого материала
GB2081758B (en) * 1980-08-12 1984-02-22 Le Nii Textilnoi Regulating apparatus for automatically controlling the evenness of the linear density of a silver
US4477398A (en) * 1982-07-06 1984-10-16 Eastman Kodak Company Yarn monitoring process
JPS6055607A (ja) * 1983-09-07 1985-03-30 松下電器産業株式会社 積層セラミックコンデンサの製造方法
SU1516532A1 (ru) * 1988-02-15 1989-10-23 Орловское специальное конструкторское бюро текстильных машин Устройство дл регулировани линейной плотности волокнистого продукта
DE3815200C2 (de) * 1988-05-04 1998-01-29 Truetzschler Gmbh & Co Kg Verfahren und Vorrichtung zur Überwachung des Vergleichmäßigens mindestens eines Faserverbandes in einem Regulierstreckwerk
JPH02200834A (ja) * 1989-01-31 1990-08-09 Baba Sangyo Kikai Kk 整経機の張力制御装置
US4974296A (en) * 1990-02-23 1990-12-04 Platt Saco Lowell Corporation, Inc. Apparatus for correcting irregularities in a textile strand
US5146651A (en) * 1990-12-21 1992-09-15 E. I. Du Pont De Nemours And Company Process and apparatus for tow cross-section measurement and control

Also Published As

Publication number Publication date
PT98024B (pt) 1998-12-31
DE4019469A1 (de) 1992-01-02
JPH04250333A (ja) 1992-09-07
IE912089A1 (en) 1992-01-01
EP0464417A1 (fr) 1992-01-08
US5490308A (en) 1996-02-13
DE59108643D1 (de) 1997-05-07
PT98024A (pt) 1993-06-30

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