US2820988A - Device and a process for controlling the crimping arc in compression crimping of strands of fibers - Google Patents

Device and a process for controlling the crimping arc in compression crimping of strands of fibers Download PDF

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US2820988A
US2820988A US432812A US43281254A US2820988A US 2820988 A US2820988 A US 2820988A US 432812 A US432812 A US 432812A US 43281254 A US43281254 A US 43281254A US 2820988 A US2820988 A US 2820988A
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crimping
strand
strands
degree
compression
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US432812A
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Wegener Harry
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Inventa AG fuer Forschung und Patentverwertung
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Inventa AG fuer Forschung und Patentverwertung
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    • 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
    • D02G1/12—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes
    • D02G1/125—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes including means for monitoring or controlling yarn processing

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  • the present invention relates to a process for controlling the crimping arc in compression crimping of a strand of fibers, and a device therefor.
  • Compression crimping has recently been used on a large scale for the production of imitation wool from staple fiber.
  • the compression crimping of fiber strands or cables for spinning does not result in a definite crimping for each fibril present in the strand determined by the are number per cm., but the are numbers vary within a certain range.
  • the variation of the crimping number over the above mentioned range is, with given adjustment, generally a function of the crimping pressure.
  • the crimping pressure is not a constant during the operation, since it depends on various factors, such as fluctuations of the titre, changes in the moisture content of the strand, etc.; the crimping number has, therefore, to be regularly tested.
  • the crimping pressure is then regulated manually according to the test results.
  • the high rates, at which strands are moved in modern processing, require very short test intervals in order to avoid considerable lengths of fibers to be produced which do not come up to crimping specifications.
  • the present invention relates to a process and device for compression crimping and more specifically for the automatic control of the crimping arc in fiber strands for spinning.
  • the ratio of the speed of the strand moving out of the crimping device and the speed at which the strand is drawn oflE by the machine following the crimper is so adjusted, that a certain amount of the fiber will collect on a scale where it is constantly weighed, the deviations from a certain adjusted value being used for the regulation of the crimping pressure in the crimping chamber.
  • the process is based on the fact that a smooth strand entering into the crimping device is shortened by the crimping process.
  • the amount of the shortening corresponds to the degree of crimping which is expressed by the ratio of smooth strand and the crimped strand. If the strand leaving the crimping device is passed on to the machine drawing it off, which is usually a cutting device, the latter has to run more slowly than the crimping device in accordance with the ratio above specified.
  • the length of strand between the two devices is at all times the same; if the crimping pressure is changed, the height of the individual crimping arcs is likewise changed, which also alters the are number and thereby the degree of crimping.
  • the change in the degree of crimping is shown by the fact that a different length of strand than heretofore will be between the two machines. If, with a constant degree of crimping, for instance, the strand between the two machines exhibits a certain slack, the magnitude of the slack changes in accordance with the changing degree of crimping. The slack becomes smaller as the degree of crimping increases and 2,820,988 Patented Jan. 28, 1958 the slack becomes larger, as the crimping degree decreases.
  • the change in lengths of the strand between the two machines may also be made recognizable in another manner, and it may at the same time be used for the automatic regulation of the degree of crimping and of the are number associated therewith. If, for instance, the crimped strand emerging from the crimping device is first allowed to drop into a container where a certain amount is .stored, the cutting machine will, with a constant degree of crimping being maintained, draw 01f exactly the same lengths as delivered by the crimping device. The stored amount in the container does not change in weight. When the container is placed on the scale, the indicator of the latter will invariably point at the same mark.
  • the degree of crimping will rise, i. e. the crimped strand will be comparatively shorter than before. Since, however, the speeds of both machines are not changed, the cutting machine moves comparatively too fast, that is to say, it pulls off a longer strand than the one delivered from the crimping device. Consequently, the content of the container decreases and the scale shows reduction in weight.
  • the scale when a larger strand length is delivered by the crimping device than pulled ofi by the cutting machine, the scale will indicate an increase in weight of the stored fiber and this will correspond to a decrease in the degree of crimping.
  • the admissible range in the variation of the crimping degree is measured by the use of two limit marks on the graduated plate of the scale; when the indicator reaches these limit marks, a servomotor is actuated which controls the crimping pressure in the crimping device.
  • a smooth strand indicated at 1 is introduced into a compression chamber 3 by means of two feeding rollers 2.
  • the exit opening from the chamber is closed at first, for instance by a fiap 12 in the sidewall of the chamber which is spring-controlled by a spring 13.
  • chamber 3 With flap 12 in closed position, chamber 3 will be filled up until by further filling the contents are compressed. This will continue until the pressure in the chamber reaches a degree that will allow it to overcome the counter-pressure of spring 13, so that the chamber opens up.
  • An equilibrium will be formed between the crimping pressure inside and the spring pressure outside and on this equilibrium the degree of crimping will depend.
  • a screw 14 is provided for the adjustment of the pressure operating as crimping pressure. The regulation of screw 14 is controlled by a servomotor 15, coupled with the screw.
  • the crimped strand 4 emerges from the crimping chamber and drops into a container 5 where it forms a stored amount 6, which is drawn ofi by a pair of rollers 7.
  • Container 5 is disposed on the platform of a scale 8.
  • the scale has an indicator 9 movable on a graduated plate 10, which has two limit marks 11.
  • the pivoted end of indicator 9 is connected to one pole of a weak current source S, whose other pole is connected to a conventional electrical or pneumatic relay A.
  • a current source 20 Arranged between the relay A and the motor 15, is a current source 20.
  • the power source S is capable of changing the direction of rotation of the motor 15 by reversing the polarity of the current source 20.
  • the voltages generated by the two dynamos arertransmitted in opposite directio'nsfto the meter 16, which in this case is a volt-meter. Since this meter indicates the ratio ,of the two voltages which are in direct proportion to the R. PQM. of the roller pairs 2 and 7, the scale of the volt-meter 16 can 'be calibrated to indicate directly the. degree of crimping. According to the indicated degree, the ratio of thewtop speeds of the rollers can be adjusted as required 'in'any particular case.
  • Example A strand composed of 28,000'Lfibers of a; titre :of 3.75 per fibril is fed in between rollers 2.
  • the rollers are driven at 150 m./min.
  • the chamber 3 has a capacity "of 100 'cm.
  • the pressure which is vbrought to bear on wall 12 of'chamber 3 is adjusted to 40 kg./cm
  • the instrument 16 indicates-:in-degrecs of -cfimp'ingthe rates :of the-speeds cf roller' 'sys'tems and 7.
  • a change in pressure is automatically effected by ,the weight of the accumulationti of strand 4 when required.
  • the mechanism for effectingfthat change operates as above described by means of motor 15 and screw 14 acting on spring 13.
  • V p 'L K proc'ess' rm the continuous contrdlof' the ping "arc in compression crimping of 'fiber -strand's;wh1ch comprises crimping s'ai'd strands inone "operatiomwithdrawing saidstrands in crimped condition; maintaining; definite ratio between the :fe'edingof the uncrimped strand and the withdrawing thereof in crimped condition, allowing anamount of the crimped strand to collect. forweighing the "same, and using thedeviations" in weight from an adjustedvalue for regulating the crimpinggpress'ure in V said crimping'operation.
  • a device for the continuous "control of the crimping arc in compression crimping of fiber strands which comprises 'a crimpin chamberswith intake .ifiean's fo said strands, means for exerting ad'etermined crimping.

Description

J. 28, 1958 I H. WEGENER 2,820,988
AND A PROCESS FOR DEVICE CONTROLLING THE CRIMPING ARC IN COMPRESSION CRIMPING OF STRANDS 0F FIBERS Filed May 27, 1954' PNEUMATIC RELAY CURRENT SUPPLY sounce- IHHHHH INVEN TOR.
%MMLWWW/ United States Patent F DEVICE AND A PROCESS FOR CONTROLLING THE CRIMPING ARC IN COMPRESSION CRIMP- lNG OF STRANDS 0F FIBERS Harry Wegener, Ems, Switzerland, assignor to Inventa A. G. fuer Forschung und Patentverwertung, Zurich, Switzerland Application May 27, 1954, Serial No. 432,812
Claims priority, application Switzerland May 28, 1953 5 Claims. (CI. 19-66) The present invention relates to a process for controlling the crimping arc in compression crimping of a strand of fibers, and a device therefor.
Compression crimping has recently been used on a large scale for the production of imitation wool from staple fiber. In the known processes, the compression crimping of fiber strands or cables for spinning, however, does not result in a definite crimping for each fibril present in the strand determined by the are number per cm., but the are numbers vary within a certain range.
The variation of the crimping number over the above mentioned range is, with given adjustment, generally a function of the crimping pressure. The crimping pressure is not a constant during the operation, since it depends on various factors, such as fluctuations of the titre, changes in the moisture content of the strand, etc.; the crimping number has, therefore, to be regularly tested. The crimping pressure is then regulated manually according to the test results. The high rates, at which strands are moved in modern processing, require very short test intervals in order to avoid considerable lengths of fibers to be produced which do not come up to crimping specifications.
The present invention relates to a process and device for compression crimping and more specifically for the automatic control of the crimping arc in fiber strands for spinning. In this process, the ratio of the speed of the strand moving out of the crimping device and the speed at which the strand is drawn oflE by the machine following the crimper is so adjusted, that a certain amount of the fiber will collect on a scale where it is constantly weighed, the deviations from a certain adjusted value being used for the regulation of the crimping pressure in the crimping chamber.
The process is based on the fact that a smooth strand entering into the crimping device is shortened by the crimping process. The amount of the shortening corresponds to the degree of crimping which is expressed by the ratio of smooth strand and the crimped strand. If the strand leaving the crimping device is passed on to the machine drawing it off, which is usually a cutting device, the latter has to run more slowly than the crimping device in accordance with the ratio above specified. When a constant crimping pressure and a constant crimping degree are used, the length of strand between the two devices is at all times the same; if the crimping pressure is changed, the height of the individual crimping arcs is likewise changed, which also alters the are number and thereby the degree of crimping.
Since, however, the ratio of speeds of the two machines remains the same, the change in the degree of crimping is shown by the fact that a different length of strand than heretofore will be between the two machines. If, with a constant degree of crimping, for instance, the strand between the two machines exhibits a certain slack, the magnitude of the slack changes in accordance with the changing degree of crimping. The slack becomes smaller as the degree of crimping increases and 2,820,988 Patented Jan. 28, 1958 the slack becomes larger, as the crimping degree decreases.
In accordance with the present invention, the change in lengths of the strand between the two machines may also be made recognizable in another manner, and it may at the same time be used for the automatic regulation of the degree of crimping and of the are number associated therewith. If, for instance, the crimped strand emerging from the crimping device is first allowed to drop into a container where a certain amount is .stored, the cutting machine will, with a constant degree of crimping being maintained, draw 01f exactly the same lengths as delivered by the crimping device. The stored amount in the container does not change in weight. When the container is placed on the scale, the indicator of the latter will invariably point at the same mark. If at this time the crimping pressure is increased, the degree of crimping will rise, i. e. the crimped strand will be comparatively shorter than before. Since, however, the speeds of both machines are not changed, the cutting machine moves comparatively too fast, that is to say, it pulls off a longer strand than the one delivered from the crimping device. Consequently, the content of the container decreases and the scale shows reduction in weight.
In the opposite case, when a larger strand length is delivered by the crimping device than pulled ofi by the cutting machine, the scale will indicate an increase in weight of the stored fiber and this will correspond to a decrease in the degree of crimping.
According to the present invention, the admissible range in the variation of the crimping degree is measured by the use of two limit marks on the graduated plate of the scale; when the indicator reaches these limit marks, a servomotor is actuated which controls the crimping pressure in the crimping device.
In the accompanying drawing, a device according to the invention for carrying out the process heretofore de-' scribed is illustrated by way of example in a preferred embodiment. It should, however be understood, that the example is given by way of illustration and not by limitation and that many changes in the details may be made without departing from the spirit of the invention.
A smooth strand indicated at 1 is introduced into a compression chamber 3 by means of two feeding rollers 2. The exit opening from the chamber is closed at first, for instance by a fiap 12 in the sidewall of the chamber which is spring-controlled by a spring 13. With flap 12 in closed position, chamber 3 will be filled up until by further filling the contents are compressed. This will continue until the pressure in the chamber reaches a degree that will allow it to overcome the counter-pressure of spring 13, so that the chamber opens up. An equilibrium will be formed between the crimping pressure inside and the spring pressure outside and on this equilibrium the degree of crimping will depend. A screw 14 is provided for the adjustment of the pressure operating as crimping pressure. The regulation of screw 14 is controlled by a servomotor 15, coupled with the screw.
The crimped strand 4 emerges from the crimping chamber and drops into a container 5 where it forms a stored amount 6, which is drawn ofi by a pair of rollers 7. Container 5 is disposed on the platform of a scale 8. The scale has an indicator 9 movable on a graduated plate 10, which has two limit marks 11.
The pivoted end of indicator 9 is connected to one pole of a weak current source S, whose other pole is connected to a conventional electrical or pneumatic relay A. Arranged between the relay A and the motor 15, is a current source 20. The power source S is capable of changing the direction of rotation of the motor 15 by reversing the polarity of the current source 20.
As soon as indicator 9 reaches one of the marks, the
3- I servomotor 1'5'is actuated in a manner known per see, by the relay means A1 "The servomo'tor will 'then turn screw 14 to advanced or retracted position. Since this screw 3 .8 nlly tto, be .turncdsby cslighttdegrees, motor- 15 coupled "thereto with a large transmission. i
Furthermore, known means, ofsthe measuring technique are 'Iis'edff'or searching the osition of indicator 59. with respecttt'o marks '11 in certain interyalsgIand to 'a djnst servo motor '15 so that it ,will run only "fora short .Itime, whichcan "b chosen as required, in. order. to make only a small turn in the adjustment c'ftsc'rew 14. This time, during which the motoris running, will be shorter than the time interval between 'tWo' Search iop'eiatibn's of .ind am r y Between the rollers 7 'and'."the feed '1'ollers"2,,a-mc't'ering device 16 is arranged 'forme'a'siuring the speed, with which the strand ente'r'sfthe pair-cf ro'llers'7. 'The meter 16 indicates [the quotient in crimping degrees. One wa in which this can be done is'to arranged aDQC. dynamo to be driven by the pair of feed rollers 2 and anothe'r-DQC. dynamo driven by rolle'rs 7. "The voltages generated by the two dynamos arertransmitted in opposite directio'nsfto the meter 16, which in this case is a volt-meter. Since this meter indicates the ratio ,of the two voltages which are in direct proportion to the R. PQM. of the roller pairs 2 and 7, the scale of the volt-meter 16 can 'be calibrated to indicate directly the. degree of crimping. According to the indicated degree, the ratio of thewtop speeds of the rollers can be adjusted as required 'in'any particular case.
Example A strand composed of 28,000'Lfibers of a; titre :of 3.75 per fibril is fed in between rollers 2. The rollers are driven at 150 m./min. The chamber 3 has a capacity "of 100 'cm. The pressure which is vbrought to bear on wall 12 of'chamber 3 is adjusted to 40 kg./cm
As soon as 3 meters'of the strand have been "fed into chamber 3, the pressure insidewill have -increased to a'n amount which. causes spring 13 "tomove to the righthand side (in the drawing) andwill open the exit at the bottom of chamber 3. The crimped strand will then have 18 crimping arcs per lcm. on the average. 7
As the s'trand4 descends frorn chamberfi, i't'i s' collected' in container 5 'on 'scale 8. From" there the :strand is drawnvofi by a pair of rollers 7 which arexdrivenfat .125 M. :P. M.
The instrument 16 indicates-:in-degrecs of -cfimp'ingthe rates :of the-speeds cf roller' 'sys'tems and 7.
A change in pressure is automatically effected by ,the weight of the accumulationti of strand 4 when required. The mechanism for effectingfthat change operates as above described by means of motor 15 and screw 14 acting on spring 13.
What I claim is: V p 'L K proc'ess' rm the continuous contrdlof' the ping "arc in compression crimping of 'fiber -strand's;wh1ch comprises crimping s'ai'd strands inone "operatiomwithdrawing saidstrands in crimped condition; maintaining; definite ratio between the :fe'edingof the uncrimped strand and the withdrawing thereof in crimped condition, allowing anamount of the crimped strand to collect. forweighing the "same, and using thedeviations" in weight from an adjustedvalue for regulating the crimpinggpress'ure in V said crimping'operation. p
2. A device for the continuous "control of the crimping arc in compression crimping of fiber strands which comprises 'a crimpin chamberswith intake .ifiean's fo said strands, means for exerting ad'etermined crimping. sure on the strands, means 'for withdrawing :said tr d's" aftercrimping from said-chamber, weigliing 'fi'ie'ain'sdn r-l po's'ed between the crimping chamber and the ing means, and control "means for "maintaining "a "defi m 0 between the -feeding of :the uncrim'ped str'an said crimping chamber 'and the withdrawing thereof it c'rimpedcdndition, the amount cf "the 'cfim ce collected on the weighing means being operative infregulating the crimping pressure eXe'rted'on the strand i'r'r'the said withdrawing means of 't' heQst'r'and, :s'a'id meteringdevice indicating the degree of crimping which serves 'as a a ing a platform and inclined slide ifo'r cbliectiiigfthi is; A device;-according to claim -21, w er n theweig'lip ing means includes a graduated plate having two marks, and an indicator -movable overs plate; 'mea'nsfbeing associated with said-indicatoribe'co ing operative, when said indicator Apasse's'beyon'd marks; in actuating a *servdmotorfor control pr'e'ssnre cXer'tingQmeans associated with 'said cngmber-t Nc rcfcren escitcdt "graduated
US432812A 1953-05-28 1954-05-27 Device and a process for controlling the crimping arc in compression crimping of strands of fibers Expired - Lifetime US2820988A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3166821A (en) * 1962-11-26 1965-01-26 Monsanto Co Crimping apparatus
US3174206A (en) * 1961-11-29 1965-03-23 Klinger Mfg Co Ltd Apparatus for crimping yarn by bunching
US3296677A (en) * 1963-05-20 1967-01-10 Eastman Kodak Co Crimping apparatus and process
US3390438A (en) * 1963-10-15 1968-07-02 Epstein Herman Method and apparatus for continuous crimping of textile yarns
US3526023A (en) * 1967-08-18 1970-09-01 Algemene Kunstzijde Unie Nv Apparatus for box crimping synthetic yarns
US3528149A (en) * 1967-04-14 1970-09-15 Ici Ltd Crimping of yarn
US4226010A (en) * 1978-12-07 1980-10-07 Chevron Research Company Process for bounce crimp texturizing yarn
US4316311A (en) * 1978-12-07 1982-02-23 Chevron Research Bounce crimping apparatus
US4547934A (en) * 1984-01-31 1985-10-22 Phillips Petroleum Company Crimped staple fiber
US6009606A (en) * 1995-10-16 2000-01-04 Neumag-Neumuenstersche Mashinen-Und Analagenbau Gmbh Device for crimping of synthetic bundles or slivers of yarns
US20090230583A1 (en) * 2008-03-03 2009-09-17 M.A.E. S.P.A. Apparatus for crimping chemical-fibre filaments and control methods thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2617019C3 (en) * 1976-04-17 1986-05-07 Bayer Ag, 5090 Leverkusen Device for determining the crimp on running cables of synthetic textile threads

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE119521C (en) *
DE487071C (en) * 1925-12-30 1929-12-28 Augustin Pellerin Device for the production of wool-like cellulose synthetic threads
DE741106C (en) * 1938-11-12 1943-11-04 Ig Farbenindustrie Ag Device for curling a synthetic fiber ribbon
DE879281C (en) * 1952-02-21 1953-04-23 Courtaulds Ltd Process for the continuous wet treatment of a freshly spun, endless artificial thread tow

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3174206A (en) * 1961-11-29 1965-03-23 Klinger Mfg Co Ltd Apparatus for crimping yarn by bunching
US3166821A (en) * 1962-11-26 1965-01-26 Monsanto Co Crimping apparatus
US3296677A (en) * 1963-05-20 1967-01-10 Eastman Kodak Co Crimping apparatus and process
US3390438A (en) * 1963-10-15 1968-07-02 Epstein Herman Method and apparatus for continuous crimping of textile yarns
US3528149A (en) * 1967-04-14 1970-09-15 Ici Ltd Crimping of yarn
US3526023A (en) * 1967-08-18 1970-09-01 Algemene Kunstzijde Unie Nv Apparatus for box crimping synthetic yarns
US4226010A (en) * 1978-12-07 1980-10-07 Chevron Research Company Process for bounce crimp texturizing yarn
US4316311A (en) * 1978-12-07 1982-02-23 Chevron Research Bounce crimping apparatus
US4547934A (en) * 1984-01-31 1985-10-22 Phillips Petroleum Company Crimped staple fiber
US6009606A (en) * 1995-10-16 2000-01-04 Neumag-Neumuenstersche Mashinen-Und Analagenbau Gmbh Device for crimping of synthetic bundles or slivers of yarns
US20090230583A1 (en) * 2008-03-03 2009-09-17 M.A.E. S.P.A. Apparatus for crimping chemical-fibre filaments and control methods thereof
US7748092B2 (en) * 2008-03-03 2010-07-06 M.A.E. S.P.A. Apparatus for crimping chemical-fibre filaments and control methods thereof

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CH313145A (en) 1956-03-31
NL187643B (en)
DE1100226B (en) 1961-02-23
GB753082A (en) 1956-07-18

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