EP1709431A2 - Procede et dispositif de surveillance optique d'un faisceau de fibres qui chemine - Google Patents

Procede et dispositif de surveillance optique d'un faisceau de fibres qui chemine

Info

Publication number
EP1709431A2
EP1709431A2 EP05700899A EP05700899A EP1709431A2 EP 1709431 A2 EP1709431 A2 EP 1709431A2 EP 05700899 A EP05700899 A EP 05700899A EP 05700899 A EP05700899 A EP 05700899A EP 1709431 A2 EP1709431 A2 EP 1709431A2
Authority
EP
European Patent Office
Prior art keywords
fiber strand
coupling
area
light signal
light
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.)
Withdrawn
Application number
EP05700899A
Other languages
German (de)
English (en)
Inventor
Gerald Berger
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.)
Oerlikon Textile GmbH and Co KG
Original Assignee
Saurer GmbH and Co KG
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 Saurer GmbH and Co KG filed Critical Saurer GmbH and Co KG
Publication of EP1709431A2 publication Critical patent/EP1709431A2/fr
Withdrawn legal-status Critical Current

Links

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

Definitions

  • the invention relates to a method for the optical monitoring of a running fiber strand according to the preamble of claim 1 and a device for carrying out the method according to the preamble of claim 8.
  • a fiber strand in the sense of the present invention is both
  • the fiber material present can contain impurities in the form of foreign substances and foreign fibers, which can lead to undesirable irregularities in the thread produced therefrom and thus also in the textiles produced in subsequent processes.
  • the fiber strand is optically monitored to prevent such contaminants from getting into the thread or the textile.
  • a method and a device are known from EP 0643294 A1, in which a light signal is applied to the fiber strand. The one produced by the fiber strand
  • Reflection signal is led to an image by means of a detector.
  • the light intensity of the image is compared with a predetermined threshold.
  • the predefined threshold value specifies the limit value for contamination that is still permissible in the Fiber strand. In the event that this limit value is exceeded, an error signal is generated in order to trigger a process intervention.
  • the known method and the known device are based on the fact that the foreign substances and foreign fibers are present in such a way that they have a clearly different reflection behavior of light signals with respect to the fiber to be produced. In cases where, for example, foreign fibers of the same color or foreign substances are incorporated in the fiber strand, identification with the known methods and the known device is not possible.
  • the invention is based on the knowledge that natural fibers such as cotton, for example, consist of a cell network in the microscopic structure. Such a fiber is very poorly able to conduct a light signal because of the cell transitions. In contrast, however, artificial substances or fibers have a relatively good light conductivity. Based on this knowledge, the invention provides that the light signal first strikes the fiber strand in a coupling area, while the transmitted light signal from the fiber strand is detected in a coupling area lying outside the coupling area. The decoupled light signal thus points to foreign fibers that have a light conductivity and can thus lead the coupled light signal from the coupling area into the coupling area.
  • the coupling area defines the zone in which the light signal impinges on the fiber strand.
  • the decoupling area denotes the zone in which the forwarded
  • Light signal is sensed when it is coupled out.
  • the light source is aligned with the coupling area and the detector with the coupling area.
  • the invention is therefore particularly suitable for identifying in particular foreign fibers made of plastic, such as polypropylene, which are usually used in practice as packaging material for the non-spun natural fiber and can thus reach the spinning process when unpacking as a foreign component in the further processing of the natural fibers.
  • plastic such as polypropylene
  • plastic fibers have a smooth surface, they are not integrated into the natural fiber structure like a natural fiber. Due to the lack of static friction, a large number of kinks occur along the only partially integrated foreign fiber made of plastic, which lead to the coupling and decoupling of the light signals.
  • the coupling-in area and the coupling-out area can therefore be separated from one another.
  • the areas can be arranged next to one another on the fiber strand at a distance in the millimeter range and / or be offset from one another at an angle which essentially likewise prevents the areas from touching or even overlapping. In this way, even very short pieces of fiber can be reliably identified.
  • a minimum distance between the coupling-in area and the coupling-out area prevents reflection signals from the coupling-in area from being recorded, which would influence the measurement result and thus the reliable detection of foreign fibers.
  • a distance in the range of 0.5 mm to 5 mm has proven itself.
  • the light signal is projected perpendicularly onto the fiber strand as a very narrow band.
  • the light signal is preferably generated by a laser.
  • the light band preferably has a width of approximately 2 mm.
  • the decoupled light signal is received by a photocell in accordance with an advantageous development of the invention.
  • the light intensity of the outcoupled light signal is decisive for determining the foreign fibers or the foreign substance.
  • the photocell can be combined with an optical system, advantageously with a macro lens, by means of which the coupling-out area on the fiber strand is defined.
  • the measured light intensity is compared with a threshold value in order to reliably detect a foreign substance and to prevent the foreign substance from reaching the end product.
  • An error signal is only generated when the threshold value is exceeded, which in turn triggers a process intervention, in particular a process interruption with subsequent elimination of the section of the fiber strand containing foreign fibers.
  • the device according to the invention has evaluation electronics with a storage means and a computing means. The evaluation electronics can thus be combined directly with a control device by which the manufacturing process is controlled.
  • Fig. 1 schematically shows a first embodiment of the device according to the invention for performing the method according to the invention.
  • Fig. 2 schematically shows a plan view of a fiber strand to be monitored
  • Fig. 3 schematically shows another embodiment of the device according to the invention for performing the method according to the invention
  • FIG. 1 schematically shows a first exemplary embodiment of the device according to the invention for carrying out the method according to the invention for the optical monitoring of a fiber strand, for example in the form of a fiber ribbon.
  • This fiber strand can alternatively also be a thread.
  • the device has a light source 2, which is designed as a laser and which generates a bundled light signal 3 perpendicular to the running fiber strand 1.
  • the light signal 3 strikes the surface of the fiber strand 1 in a coupling region 4.
  • a coupling-out area 6 is assigned to the coupling-in area 4 at a distance A in the running direction of the fiber strand 1.
  • the outcoupling area 6 represents the zone on the fiber strand 1 to which a detector 9 and an optical system 8 are aligned for monitoring the fiber strand.
  • the detector 9 is designed as a photocell, which is coupled to an evaluation electronics 10.
  • the evaluation electronics 10 contain a storage means 11 and computer means 12.
  • the evaluation electronics 10 is connected to a control device 13.
  • FIG. 2 shows schematically a top view of the fiber strand 1 with a light signal projected onto the surface of the fiber strand 1, which is in the form of a Light band 14 represents the coupling area 4.
  • the coupling-out area 6 set by the optics 8 is identified as a circle.
  • a light signal 3 generated by a light source 2 is projected onto the surface of the fiber strand 1 in a first position.
  • This position is referred to as the coupling region 4, in which the light signal 3 is coupled into the fiber composite of the fiber strand 1.
  • a quantity of light also reaches the foreign fiber 5 from the light signal 3.
  • the light is preferably coupled in at kinks or edges of the foreign fiber and passed on through the foreign fiber. In this way, the light inside the foreign fiber 5 arrives at the coupling-out area 6 arranged at a distance A.
  • the coupling-out area 6 is scanned perpendicularly to the fiber strand 1 by the optics 8 and the detector 9.
  • the optics 8 are preferably formed by a macro lens in order to obtain the smallest possible observation area covering the thickness of the fiber strand.
  • the size of the decoupling area depends on the thickness of the fiber strand. Due to the kinks contained in the foreign fiber 5, light waves are coupled out, which reach the detector 9 from the coupling area 6.
  • the detector 9 is designed as a photocell in order to receive and evaluate the out-coupled light signals.
  • the distance A between the coupling area 4 and the coupling area 6 is approximately 1 mm. That is the distance over which the light must be directed. Depending on the circumstances and the size of the foreign fibers to be detected, the distance can be 0.5 mm to 5 mm or more.
  • the detector 9 is linked to the evaluation electronics 10.
  • a threshold value is stored in the storage means 11 of the evaluation electronics 10.
  • the threshold value represents a permissible light intensity, which serves as a limit for identification of a foreign substance.
  • the measurement signal emitted by the detector and the threshold value are compared with one another in the computer means 12, which can be formed, for example, by a comparator. If the threshold value is exceeded, an error signal is generated, which is forwarded by the evaluation electronics directly to the control device 13. Within the control device 13, the error signal leads to the triggering of a process change, in particular an interruption of the fiber strand with subsequent elimination of the error point. This ensures that the fiber section with the foreign fiber does not get into the end product.
  • the light source and the detector are arranged in one plane with the longitudinal axis of the fiber strand and combined, for example, in one structural unit. This is due to the generally non-uniform and irregular course of the foreign fiber
  • the light source and the detector can be arranged at an angle deviating from 90 ° with respect to the running direction of the fiber strand. Furthermore, the use of a laser as a light source and a photo cell as a detector in the
  • FIG. 1 Exemplary embodiment according to FIG. 1.
  • other light-emitting optical systems can also be used which have a divergence towards 0 in order to project light signals onto the surface of the fiber strand.
  • Line sensors can also advantageously be used as detectors.
  • FIG. 3 schematically shows a further exemplary embodiment of the device according to the invention for carrying out the method according to the invention.
  • a schematic view is shown transversely to the grain direction.
  • the fiber strand 1 is shown in a cross-sectional view that is the same as the plane of the drawing.
  • a light signal 3 for example, a light emitting diode is provided.
  • an optical system 15 consisting of a lens and a diaphragm.
  • the light signals 3 strike the fiber strand 1 in the coupling region 4.
  • the coupling-out area 6 is assigned an optical system 8, for example in the form of a macro lens, and a detector 9, for example in the form of a photo cell.
  • FIG. 3 The function of the device shown in FIG. 3 is identical to the previous exemplary embodiment, so that reference is made to the preceding description here.
  • the angular offset between the optical axes allows a very compact design.
  • the method and the device according to the invention have the particular advantage that, especially when processing natural fibers, the foreign fiber components released from the packaging material, even if they are transparent or do not differ in color from the natural fibers, can be reliably identified and eliminated.
  • Braids made of foil tapes, preferably made of polypropylene, are used as packaging. Due to the light conductivity of the PP fiber, identification when monitoring the fiber strand is possible with a high degree of security. In principle, any visible light spot within the decoupling area can be identified as a foreign substance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de surveillance optique d'un faisceau de fibres naturelles qui chemine. Selon l'invention, un signal lumineux est envoyé sur le faisceau de fibres, est à nouveau émis au niveau d'un autre emplacement de la surface du faisceau de fibres, reçu par un détecteur et évalué pour déterminer la présence d'une substance étrangère. Ainsi, les substances étrangères qui conduisent la lumière sont différenciés des fibres naturelles qui ne conduisent pas la lumière.
EP05700899A 2004-01-15 2005-01-14 Procede et dispositif de surveillance optique d'un faisceau de fibres qui chemine Withdrawn EP1709431A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004002047A DE102004002047A1 (de) 2004-01-15 2004-01-15 Verfahren und Vorrichtung zur optischen Überwachung eines laufenden Faserstranges
PCT/EP2005/000292 WO2005068985A2 (fr) 2004-01-15 2005-01-14 Procede et dispositif de surveillance optique d'un faisceau de fibres qui chemine

Publications (1)

Publication Number Publication Date
EP1709431A2 true EP1709431A2 (fr) 2006-10-11

Family

ID=34716551

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05700899A Withdrawn EP1709431A2 (fr) 2004-01-15 2005-01-14 Procede et dispositif de surveillance optique d'un faisceau de fibres qui chemine

Country Status (5)

Country Link
US (1) US7551284B2 (fr)
EP (1) EP1709431A2 (fr)
CN (1) CN100489506C (fr)
DE (1) DE102004002047A1 (fr)
WO (1) WO2005068985A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004053736B4 (de) * 2004-11-06 2013-05-29 Oerlikon Textile Gmbh & Co. Kg Garnsensor
DE102004053735A1 (de) * 2004-11-06 2006-05-11 Saurer Gmbh & Co. Kg Garnsensor
US8120769B2 (en) * 2007-08-03 2012-02-21 North Carolina State University Method and system for fiber properties measurement
WO2012128324A1 (fr) * 2011-03-24 2012-09-27 オリンパス株式会社 Système d'éclairement
EP2647949A1 (fr) * 2012-04-04 2013-10-09 Siemens VAI Metals Technologies GmbH Méthode et dispositif de mesure de planéité d'un produit métallique
CN107407628B (zh) * 2015-03-24 2020-05-08 乌斯特技术股份公司 基于led的纤维性能测量
CH719054A9 (de) * 2021-10-12 2023-06-30 Uster Technologies Ag Optische Charakterisierung eines Textilfasergebildes.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH683035A5 (de) * 1992-01-31 1993-12-31 Loepfe Ag Geb Verfahren und Vorrichtung zur Detektion von Verunreinigungen, insbesondere Fremdfasern in langgestreckten, textilen Gebilden.
DE4226203A1 (de) * 1992-08-07 1994-02-10 Siemens Ag Verfahren zum Erkennen der Verschmutzung einer blanken Lichtleitfaser und Vorrichtung zu dessen Durchführung
CH686803A5 (de) 1993-09-09 1996-06-28 Luwa Ag Zellweger Verfahren und Vorrichtung zur Detektion von Fremdstoffen in einem textilen Pruefgut.
WO1995021800A1 (fr) * 1994-02-15 1995-08-17 Sumitomo Electric Industries, Ltd. Fibre optique revetue et son procede de production
JP3617576B2 (ja) * 1996-05-31 2005-02-09 倉敷紡績株式会社 光散乱体の光学測定装置
WO2000073771A1 (fr) * 1999-05-29 2000-12-07 Zellweger Luwa Ag Procede et dispositif de detection de corps etrangers dans un materiau renforce par des fibres et a deplacement longitudinal
DE10347240B4 (de) * 2003-10-10 2015-10-15 Trützschler GmbH & Co Kommanditgesellschaft Vorrichtung in der Spinnereivorbereitung zum Erkennen von Fremdteilen aus Kunststoff in Faserflocken

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005068985A2 *

Also Published As

Publication number Publication date
DE102004002047A1 (de) 2005-08-04
CN100489506C (zh) 2009-05-20
US20090002707A1 (en) 2009-01-01
CN1910446A (zh) 2007-02-07
US7551284B2 (en) 2009-06-23
WO2005068985A2 (fr) 2005-07-28
WO2005068985A3 (fr) 2005-10-27

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