US3726137A - Testing texturized yarn - Google Patents

Testing texturized yarn Download PDF

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US3726137A
US3726137A US00140146A US3726137DA US3726137A US 3726137 A US3726137 A US 3726137A US 00140146 A US00140146 A US 00140146A US 3726137D A US3726137D A US 3726137DA US 3726137 A US3726137 A US 3726137A
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yarn
weight
crimping force
feed rolls
zone
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M Denton
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Heberlein and Co AG
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/36—Textiles
    • G01N33/365—Filiform textiles, e.g. yarns
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/06—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using mechanical means

Definitions

  • textured yarns yarns in which the individual filaments or fibers ther'eof have been subjected to a process which deforms them, the deformations being such that they are removed, at least to some extent, when the yarn is extended but which, because of their tendency to return, then give rise to a contractile force in the yarn.
  • the tendency of the deformations to return is accentuated by the application of heat to the yarn.
  • crimping force is meant the contractile force arising in the yarn due to this tendency of the deformations to return when the yarn is restrained from freely contracting in length under the influence of that force.
  • a method of, and means for, obtaining a comparative assessment of crimping force is desirable in order to facilitate textured yarn quality control, and also in order to make some prediction of the likely behavior of textured yarn in fabric.
  • textured yarn is made up into fabric
  • a relaxation treatment that is to say, a treatment usually under wet or hot conditions, or both, which causes an increase in yam contractile force that is eventually balanced by the restrictions imposed by the fabric construction.
  • the testing of yarn to give measurement of crimping force at a fixed retraction offers a means of predicting the probable behavior of the yarn when made up into fabric.
  • FIG. 1 is a diagram showing one apparatus for testing textured yarn according to the invention.
  • FIG. 2 is a diagram showing another apparatus for testing textured yarn according to the invention.
  • the yarn Y is shown being travelled continuously from a source of supply (not shown) to a take-up 10. During its travel, the yarn It is the object of the present invention to provide a I method of, and apparatus for, testing textured yarn which is reasonably simple, reliable and inexpensive.
  • the invention also contemplates apparatus for determining the crimping force in a textured yarn comprising means for continuously travelling a textured yarn from a source of supply to a collection position which includes a first set of feed rolls, and a second set of feed rolls to over-feed the yarn into the region therebetween, there being a pre-tensioning device in advance of the first set of feed rolls, and, between the first and second sets of feed rolls, a yarn heater, and a weighted member around which the yarn can be looped, and which is so arranged that it will assume a position dependent on the magnitude of the crimping force in the yarn.
  • a pre-tensioner 12 for example of the hysteresis type, which is adjustable so that a fixed pretension may be applied to the yarn Y, then through a mechanical tension meter 14, for example of the zivy type; then through a first set of feed rolls 16; then vertically downwardly through a tubular electric heater 18; then over a pulley 20 forming part of an indicating device which will be described in more detail hereinafter; then vertically upwardly through the heater 18; and then through a second set of feed rolls 22.
  • a pre-tensioner 12 for example of the hysteresis type, which is adjustable so that a fixed pretension may be applied to the yarn Y, then through a mechanical tension meter 14, for example of the zivy type
  • a first set of feed rolls 16 then vertically downwardly through a tubular electric heater 18; then over a pulley 20 forming part of an indicating device which will be described in more detail hereinafter; then vertically upwardly through the heater 18; and then through
  • the pulley 20 is mounted at the end of a pivotal arm 24 which has, at the other side of its pivot, a counterweight 26. Attached to the arm 24 near the end which carries the pulley 20 is one end of a hanging chain 28, the upper end of which is secured to an adjustable roller arrangement 30. The arm 24 moves, between the pulley 20 and the point at which the end of the chain 28 is attached, over a calibrated scale 32.
  • the pulley 20 will obviously assume a higher or lower position according to whether the crimping force in the yarn is the greater or the lesser, this position being a balanced one when a sufficiently additional amount of the chain 28 has become available for weighting the arm 24 (in the case where the pulley 20 rises), or when a sufficiently diminished amount of the chain 28 is available for weighting the arm 24 (in the case where the pulley 20 setting, to enable the lever to work within the limits of the scale 32, which latter then gives a fine reading.
  • the yarn Y again passes from a source of supply (not shown) to a take-up 34. In its path, it travels successively through a pre-tensioning device 36; through a first set of feed rolls 38; through a tubular electric heater 40; around a pulley 42 and through a. second set of feed rolls 44.
  • the yarn lies at an angle to the vertical direction in its approach to and departure from the pulley 42.
  • the pulley 42 again forms part of an indicating system, it being weighted by a fixed weight W, supported on a balanced light arm 46.
  • Instruments of the type just described do, of course, need calibration for the selected processing parameters. l have found that a very suitable over-feed is 6 per cent and a very suitable temperature for the heating device is about 120 degrees centigrade with a yarn speed lying between five and fifteen meters per minute. The selected pre-tension should not be excessive, otherwise the yarn would be caused to slip on the feed rolls.
  • the instruments described with reference to FIGS. 1 and 2 are capable of providing a measurement of crimping force, thus enabling the quality of such yarns as false-twist textured yarns of nylon and polyester to be assessed.
  • the instruments prove reasonably responsive to changes in the levels of yarn processing variables, as well as to changes in yarn quality arising from other causes.
  • the instruments are relatively insensitive to small changes in the temperature of the instrument heater, but quite sensitive to changes in the pre-tension applied to the yarn, and for this reason the latter should be quite carefully controlled. Changes in ambient conditions were found to have little effect.
  • Method of testing textured yarn to obtain a measurement of its crimping force comprising: continuously advancing the yarn through a first zone, applying a fixed pre-tension to the yarn in said first zone, advancing the yarn through a second zone, heating the yarn in said second zone, partially relaxing same, applying a known force to the yarn in said second zone by suspending a weight therefrom to exert tension thereon to cause same to assume a path dependent upon the magnitude of the yarn crimping force, the disposition of said weight depending on the configuration of said path, said tension varying in correspondence with changes of said disposition to permit determination of said crimping force from said disposition.
  • Apparatus for determining the crimping force in a textured yarn comprising: means for continuously advancing a textured yarn from a source of supply to a collection position, said means including first and second sets of feed rolls, said sets of feed rolls being operable to overfeed the yarn into the region therebetween, pre-tensioning means in advance of the first set of feed rolls, means for heating the advancing yarn in the region between said sets of feed rolls, and means in said region for determining the magnitude of the crimping force in the yarn, said last-mentioned means including a weight acting on the yarn to cause it to assume a path dependent on the magnitude of its crimping force, said weight exerting tension on said yarn which tension variably depends on the disposition of said weight, said tension thereby balancing said crimping force and said disposition corresponding to variations of said path.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
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  • Pathology (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

Method and means for obtaining a comparative assessment of crimping forces of textured yarn wherein the yarn is advanced between two sets of feed rolls, is heated in the region therebetween and the magnitude of its crimping force is determined in such region.

Description

United States Patent 1 1 Denton [451 Apr. 10, 1973 [54] TESTING TEXTURIZED YARN [75] Inventor: Michael James Denton, Didsbury,
- England 731 Assignee: Heberlein & Co. AG, Wattwii, s1.
Gall, Switzerland 22 Filed: May 4,1971
21 Appl.No.: 140,146
[521 LS. Cl ..l3/160, 28172.1 [51] Int. Cl. ..G0ll 5/06 [58] Field of Search ..73/160, 144, 15.6,
[56] References Cited UNITED STATES PATENTS 3,333,467 8/ i967 Hoskins ..73/ 160 1,961,755 6/ 1934 Foster ..73/l44 FOREIGN PATENTS OR APPLICATIONS 3/ 1965 Canada 1. 128/62 Primary Examiner-Louis R. Prince Assistant Examiner-Denis E. Corr Attomey-John Thomas Celia [57] ABSTRACT 8Clailm,2DrawingFigures PAIENTE APR 1 01913 I N VEN TOR. Mama Jmss Din raw TESTING TEXTUZED YARN This invention concerns the testing of yarns, and more particularly, the continuous measurement of crimping force in textured yarns. By textured yarns is meant yarns in which the individual filaments or fibers ther'eof have been subjected to a process which deforms them, the deformations being such that they are removed, at least to some extent, when the yarn is extended but which, because of their tendency to return, then give rise to a contractile force in the yarn. The tendency of the deformations to return is accentuated by the application of heat to the yarn. By crimping force is meant the contractile force arising in the yarn due to this tendency of the deformations to return when the yarn is restrained from freely contracting in length under the influence of that force.
A method of, and means for, obtaining a comparative assessment of crimping force is desirable in order to facilitate textured yarn quality control, and also in order to make some prediction of the likely behavior of textured yarn in fabric. When textured yarn is made up into fabric, it is usual for the fabric to be subjected to a relaxation treatment, that is to say, a treatment usually under wet or hot conditions, or both, which causes an increase in yam contractile force that is eventually balanced by the restrictions imposed by the fabric construction. For this reason, the testing of yarn to give measurement of crimping force at a fixed retraction offers a means of predicting the probable behavior of the yarn when made up into fabric.
tribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject of the claims appended hereto. Those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures for carrying out the several purposes of the invention. It is important, therefore, that the claims be regarded as including such equivalent construction as do not depart from the spirit and scope of the invention.
A specific embodiment of the invention has been chosen for purposes of illustration and description, and is shown in the accompanying drawings, forming a part of the specification, wherein:
FIG. 1 is a diagram showing one apparatus for testing textured yarn according to the invention; and
FIG. 2 is a diagram showing another apparatus for testing textured yarn according to the invention.
Referring first to FIG. 1, the yarn Y is shown being travelled continuously from a source of supply (not shown) to a take-up 10. During its travel, the yarn It is the object of the present invention to provide a I method of, and apparatus for, testing textured yarn which is reasonably simple, reliable and inexpensive.
According to the present invention, a method of testing a textured yarn whereby to obtain measurement of the crimping force comprises continuously travelling the yarn through a first zone wherein a fixed pre-tension is applied thereto, and then through a second zone in which it is heated and partially relaxed, by a given amount, the length of yarn in the second zone being looped around a weighted member which is so arranged that it will assume a position which is dependent on the magnitude of the crimping force in the yarn in the second zone.
The invention also contemplates apparatus for determining the crimping force in a textured yarn comprising means for continuously travelling a textured yarn from a source of supply to a collection position which includes a first set of feed rolls, and a second set of feed rolls to over-feed the yarn into the region therebetween, there being a pre-tensioning device in advance of the first set of feed rolls, and, between the first and second sets of feed rolls, a yarn heater, and a weighted member around which the yarn can be looped, and which is so arranged that it will assume a position dependent on the magnitude of the crimping force in the yarn.
It is evident that any device, of sufficient sensitivity, which is normally used for measuring the tension in running textile yarns could also be used for measuring the crimping force in the heated zone.
There has thus been outlined rather broadly the more important features of the invention in order that the detailed description thereof that follows may be better understood, and in order that the present conpasses first over a pre-tensioner 12, for example of the hysteresis type, which is adjustable so that a fixed pretension may be applied to the yarn Y, then through a mechanical tension meter 14, for example of the zivy type; then through a first set of feed rolls 16; then vertically downwardly through a tubular electric heater 18; then over a pulley 20 forming part of an indicating device which will be described in more detail hereinafter; then vertically upwardly through the heater 18; and then through a second set of feed rolls 22. The pulley 20 is mounted at the end of a pivotal arm 24 which has, at the other side of its pivot, a counterweight 26. Attached to the arm 24 near the end which carries the pulley 20 is one end of a hanging chain 28, the upper end of which is secured to an adjustable roller arrangement 30. The arm 24 moves, between the pulley 20 and the point at which the end of the chain 28 is attached, over a calibrated scale 32.
In use, with the textured yarn running through the apparatus as illustrated and as described, and with the heater 18 switched on, a certain crimping force will arise in the yarn forming the loop between the respective feed rolls 16 and 22, provided the yarn is suitably pre-tensioned by the tensioner l2, and provided the feed rolls l6 and 22 are arranged to give a suitable over-feed. Under equilibrium conditions, the arm 24 will indicate a certain reading on the scle 32. When running a different yarn under the same operating conditions and which has a different crimping force, the arm 24 will assume a different position and, therefore, give a different reading on the scale 32. The pulley 20 will obviously assume a higher or lower position according to whether the crimping force in the yarn is the greater or the lesser, this position being a balanced one when a sufficiently additional amount of the chain 28 has become available for weighting the arm 24 (in the case where the pulley 20 rises), or when a sufficiently diminished amount of the chain 28 is available for weighting the arm 24 (in the case where the pulley 20 setting, to enable the lever to work within the limits of the scale 32, which latter then gives a fine reading.
Referring now to FIG. 2, an alternative form of apparatus is shown. In this case, the yarn Y again passes from a source of supply (not shown) to a take-up 34. In its path, it travels successively through a pre-tensioning device 36; through a first set of feed rolls 38; through a tubular electric heater 40; around a pulley 42 and through a. second set of feed rolls 44. In this case, the yarn lies at an angle to the vertical direction in its approach to and departure from the pulley 42. The pulley 42 again forms part of an indicating system, it being weighted by a fixed weight W, supported on a balanced light arm 46.
In use, it will be clear that the system is self-compensating for different crimping forces in the yarn being tested, as the tension in the yarn approaching and departing from the pulley 42 is W (2 Cos where 0 is the angle which the yarn approaching and departing from pulley 42 makes with the vertical direction. Thus, comparative assessments of crimping force in different yarns may be made by noting the position of the weight W against a scale 47.
Instruments of the type just described do, of course, need calibration for the selected processing parameters. l have found that a very suitable over-feed is 6 per cent and a very suitable temperature for the heating device is about 120 degrees centigrade with a yarn speed lying between five and fifteen meters per minute. The selected pre-tension should not be excessive, otherwise the yarn would be caused to slip on the feed rolls.
I have found that the instruments described with reference to FIGS. 1 and 2 are capable of providing a measurement of crimping force, thus enabling the quality of such yarns as false-twist textured yarns of nylon and polyester to be assessed. The instruments prove reasonably responsive to changes in the levels of yarn processing variables, as well as to changes in yarn quality arising from other causes. The instruments are relatively insensitive to small changes in the temperature of the instrument heater, but quite sensitive to changes in the pre-tension applied to the yarn, and for this reason the latter should be quite carefully controlled. Changes in ambient conditions were found to have little effect.
What I claim is:
1. Method of testing textured yarn to obtain a measurement of its crimping force, comprising: continuously advancing the yarn through a first zone, applying a fixed pre-tension to the yarn in said first zone, advancing the yarn through a second zone, heating the yarn in said second zone, partially relaxing same, applying a known force to the yarn in said second zone by suspending a weight therefrom to exert tension thereon to cause same to assume a path dependent upon the magnitude of the yarn crimping force, the disposition of said weight depending on the configuration of said path, said tension varying in correspondence with changes of said disposition to permit determination of said crimping force from said disposition.
2. Method according to claim 1, wherein the yarn is advanced through a heater in said second zone and is looped back to again advance through the heater, the yarn loop supporting a weight, which is self-adjusting to ii li 352.22%? u ig t claim 1, wherein the yarn is advanced at a speed of the order of 5 to 15 meters per minute.
4. Method according to claim 3, wherein the yarn is overfed in the second zone and is heated to a temperature of the order of about C.
5. Method according to claim 4, wherein the yarn is overfed by about 6 percent.
6. Apparatus for determining the crimping force in a textured yarn, comprising: means for continuously advancing a textured yarn from a source of supply to a collection position, said means including first and second sets of feed rolls, said sets of feed rolls being operable to overfeed the yarn into the region therebetween, pre-tensioning means in advance of the first set of feed rolls, means for heating the advancing yarn in the region between said sets of feed rolls, and means in said region for determining the magnitude of the crimping force in the yarn, said last-mentioned means including a weight acting on the yarn to cause it to assume a path dependent on the magnitude of its crimping force, said weight exerting tension on said yarn which tension variably depends on the disposition of said weight, said tension thereby balancing said crimping force and said disposition corresponding to variations of said path.
7. Apparatus according to claim 6, wherein the yarn passes vertically through said heater, is looped around said weight and again passes vertically through said heater.
8. Apparatus according to claim 6, wherein said first set of feed rolls and said weight are arranged whereby the yarn passes through said heater at an angle to a vertical plane through said weight, and said weight and said second set of feed rolls are arranged whereby said yarn advances from said weight to said second set of feed rolls at an angle to said plane equal to said firstmentioned angle.

Claims (8)

1. Method of testing textured yarn to obtain a measurement of its crimping force, comprising: continuously advancing the yarn through a first zone, applying a fixed pre-tension to the yarn in said first zone, advancing the yarn through a second zone, heating the yarn in said second zone, partially relaxing same, applying a known force to the yarn in said second zone by suspending a weight therefrom to exert tension thereon to cause same to assume a path dependent upon the magnitude of the yarn crimping force, the disposition of said weight depending on the configuration of said path, said tension varying in correspondence with changes of said disposition to permit determination of said crimping force from said disposition.
2. Method according to claim 1, wherein the yarn is advanced through a heater in said second zone and is looped back to again advance through the heater, the yarn loop supporting a weight, which is self-adjusting to balance the crimping force.
3. Method according to claim 1, wherein the yarn is advanced at a speed of the order of 5 to 15 meters per minute.
4. Method according to claim 3, wherein the yarn is overfed in the second zone and is heated to a temperature of the order of about 120*C.
5. Method according to claim 4, wherein the yarn is overfed by about 6 percent.
6. Apparatus for determining the crimping force in a textured yarn, comprising: means for continuously advancing a textured yarn from a source of supply to a collection position, said means including first and second sets of feed rolls, said sets of feed rolls being operable to overfeed the yarn into the region therebetween, pre-tensioning means in advance of the first set of feed rolls, means for heating the advancing yarn in the region between said sets of feed rolls, and means in said region for determining the magnitude of the crimping force in the yarn, said last-mentioned means including a weight acting on the yarn to cause it to assume a path dependent on the magnitude of its crimping force, said weight exerting tension on said yarn which tension variably depends on the disposition of said weight, said tension thereby balancing said crimping force and said disposition corresponding to variations of said path.
7. Apparatus according to claim 6, wherein the yarn passes vertically through said heater, is looped around said weight and again passes vertically through said heater.
8. Apparatus according to claim 6, wherein said first set of feed rolls and said weight are arranged whereby the yarn passes through said heater at an angle to a vertical plane through said weight, and said weight and said second set of feed rolls are arranged whereby said yarn advances from said weight to said second set of feed rolls at an angle to said plane equal to said first-mentioned angle.
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3831444A (en) * 1972-01-26 1974-08-27 Kurashiki Boseki Kk Yarn quality assessment method and apparatus therefor
US3899927A (en) * 1972-11-04 1975-08-19 Akzona Inc Method and apparatus for the measurement of crimp contraction
US4295252A (en) * 1979-07-12 1981-10-20 E. I. Du Pont De Nemours & Co. Method for measuring yarn shrinkage and crimp development
US4393701A (en) * 1982-01-29 1983-07-19 Lawson-Hemphill, Inc. Yarn tester system
US4566319A (en) * 1982-04-09 1986-01-28 Toray Industries, Inc. Process and apparatus for measuring thermal shrinkage properties of yarn
EP0207471A2 (en) * 1985-07-03 1987-01-07 Barmag Ag Method for measuring the quality of a running yarn
US4918914A (en) * 1986-12-11 1990-04-24 Rieter Scragg Limited Yarn quality monitoring method and apparatus
US6644093B2 (en) * 2001-03-26 2003-11-11 Tyco Healthcare Group Lp Fray tester
US20050234511A1 (en) * 2004-04-15 2005-10-20 Cuevas Brian J Suture tester
US20060144122A1 (en) * 2004-11-26 2006-07-06 Charlotte Murrells Yarn snarling testing apparatus and method
CN100507504C (en) * 2007-03-29 2009-07-01 上海新纤仪器有限公司 Method and apparatus for automatically measuring fibre curling performance
US20090320437A1 (en) * 2006-08-26 2009-12-31 Siegfried Brenk Method for the thermal treatment of a running yarn and twisting machine for carrying out the method
US20130186152A1 (en) * 2011-07-20 2013-07-25 Oerlikon Textile Gmbh & Co. Kg. Yarn treatment chamber

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1961755A (en) * 1929-10-08 1934-06-05 Morgan & Wright Thread testing machine
CA705080A (en) * 1965-03-09 L. Munden Dennis Production of bulked yarns from fibre-forming thermoplastic polymers
US3333467A (en) * 1964-10-30 1967-08-01 Eastman Kodak Co Method and apparatus for evaluating crimp uniformity

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA705080A (en) * 1965-03-09 L. Munden Dennis Production of bulked yarns from fibre-forming thermoplastic polymers
US1961755A (en) * 1929-10-08 1934-06-05 Morgan & Wright Thread testing machine
US3333467A (en) * 1964-10-30 1967-08-01 Eastman Kodak Co Method and apparatus for evaluating crimp uniformity

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3831444A (en) * 1972-01-26 1974-08-27 Kurashiki Boseki Kk Yarn quality assessment method and apparatus therefor
US3899927A (en) * 1972-11-04 1975-08-19 Akzona Inc Method and apparatus for the measurement of crimp contraction
US4295252A (en) * 1979-07-12 1981-10-20 E. I. Du Pont De Nemours & Co. Method for measuring yarn shrinkage and crimp development
US4393701A (en) * 1982-01-29 1983-07-19 Lawson-Hemphill, Inc. Yarn tester system
WO1983002665A1 (en) * 1982-01-29 1983-08-04 Lawson Hemphill Yarn tester system
US4566319A (en) * 1982-04-09 1986-01-28 Toray Industries, Inc. Process and apparatus for measuring thermal shrinkage properties of yarn
EP0207471A2 (en) * 1985-07-03 1987-01-07 Barmag Ag Method for measuring the quality of a running yarn
EP0207471A3 (en) * 1985-07-03 1989-10-11 B A R M A G Barmer Maschinenfabrik Aktiengesellschaft Method for measuring the traction force of a running yarn
US4918914A (en) * 1986-12-11 1990-04-24 Rieter Scragg Limited Yarn quality monitoring method and apparatus
US6644093B2 (en) * 2001-03-26 2003-11-11 Tyco Healthcare Group Lp Fray tester
US20050234511A1 (en) * 2004-04-15 2005-10-20 Cuevas Brian J Suture tester
US7343791B2 (en) * 2004-04-15 2008-03-18 Tyco Healthcare Group Lp Suture tester
US20060144122A1 (en) * 2004-11-26 2006-07-06 Charlotte Murrells Yarn snarling testing apparatus and method
US7219556B2 (en) * 2004-11-26 2007-05-22 The Hong Kong Polytechnic University Yarn snarling testing apparatus and method
US20090320437A1 (en) * 2006-08-26 2009-12-31 Siegfried Brenk Method for the thermal treatment of a running yarn and twisting machine for carrying out the method
US7997055B2 (en) * 2006-08-26 2011-08-16 Oerlikon Textile Gmbh & Co Kg Method for the thermal treatment of a running yarn and twisting machine for carrying out the method
CN100507504C (en) * 2007-03-29 2009-07-01 上海新纤仪器有限公司 Method and apparatus for automatically measuring fibre curling performance
US20130186152A1 (en) * 2011-07-20 2013-07-25 Oerlikon Textile Gmbh & Co. Kg. Yarn treatment chamber
US9109307B2 (en) * 2011-07-20 2015-08-18 Saurer Germany Gmbh & Co. Kg Yarn treatment chamber

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