US3526023A - Apparatus for box crimping synthetic yarns - Google Patents

Apparatus for box crimping synthetic yarns Download PDF

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Publication number
US3526023A
US3526023A US751399A US3526023DA US3526023A US 3526023 A US3526023 A US 3526023A US 751399 A US751399 A US 751399A US 3526023D A US3526023D A US 3526023DA US 3526023 A US3526023 A US 3526023A
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United States
Prior art keywords
yarn
box
pressure
wad
crimped
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Expired - Lifetime
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US751399A
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English (en)
Inventor
Johan J Mertens
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Akzo NV
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Algemene Kunstzijde Unie NV
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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

Definitions

  • a method for box-crimping synthetic yarn which comprises forcing a yarn into one end of a stuffer box against a wad of the yarn already crimped within the box, crimping the yarn at the stufng pressure found within the box, discharging crimped yarn from the wad of yarn at the other end of the box, and simultaneously applying a counter-pressure to the wad of yarn that acts in a direction opposite to the direction of travel of the yarn from the box so that the stuiiing pressure within the stuffer box'remains substantially equal to a desired value.
  • the apparatus for carrying out this method includes a stuter box, a pair of driven feed rollers for forcing a yarn into the box, and a closable discharge means for applying the counterpressure to the wad of yarn at the discharge end of the box so that the stuffing pressure is maintained substantially equal to the desired value.
  • This invention relates to the box-crimping of synthetic yarn and, more particularly, to a method and apparatus in which a yarn is forced into a stuifer ⁇ box against a wad of the yarn already crimped within the box, the yarn is crimped by the stuffing pressure acting on the yarn within the stuing box, crimped yarn is discharged from the box, and a counterpressure is simultaneously applied to the wad of yarn in such a manner that the stufiing pressure is maintained at a desired value.
  • a method similar to that of this invention is known.
  • the known method generally aims at controlling the bpxcrimping process by measuring the amount of yarn present in the stuffer box or in an adjoining buffer chamber. This is often done by measuring the displacement of a discharge member, which is formed, for instance, by a hinged door. Displacement of the discharge member in this method adjusts, by way of a micro-switch, the speed of a pair of feed rollers which introduce the yarn into the box. The displacement may also serve to adjust the discharge rate of the box-crimped yarn.
  • the known method may give reasonable results, the quality, more particularly the uniformity, of the yarn crimped by this method often is not satisfactory.
  • this invention provides a method and an apparatus for carrying out the method, that makes it possible in a simple way to improve the uniformity of the boxcrimping yarn.
  • this invention contemplates a method for boxcrimping synthetic yarn which comprises forcing a yarn into one end of a stuffer box against a wad of the yarn already crimped within the box, crimping the yarn at the stuing pressure found within the box, discharging crimped yarn from the wad of yarn at the other end of the box and simultaneously so applying to the wad of yarn a counterpressure, that acts in a direction opposite to the direction of travel of the yarn from the box, that the stuffing pressure remains substantially equal to a desired or reference value.
  • the method of this invention is further char- ICC acterized in that the stuffing pressure within the stnffer box is measured and compared with the desired or reference value, a control signal indicative of the difference between the measured value and the reference value of the stuffing pressure is produced and the counterpressure is so varied as a function of the difference between the measured value and the reference Value in response to the control signal that the stui'ling pressure, as heretofore noted, remains substantially equal to the desired or reference value.
  • the yarn is forced by a pair of driven feed rollers into the feed end of the stuier box; the yarn is crimped and given a substantially zig-Zap form by the stutiing pressure acting on the yarn just downstream of the nip of the feed rollers and approximately at the beginning of the wad of yarn already crimped in the box; the crimped yarn leaves the stutter box at its discharge end via a closable discharge member or means, and the counterpressure is applied to the wad of yarn within the box by the discharge member.
  • the stuffing pressure may advantageously :be measured automatically and be compared automatically with the desired value, if desired, by way of a transmission system or means.
  • the desired or reference value of the stuffing pressure is kept practically constant.
  • embodiments of the method may also be such that the desired or reference value of the stuffing pressure is adjustable.
  • the desired or reference value of the stufling pressure may, with advantage, also be varied during operation of the crimping process.
  • This invention also is directed to an apparatus for carrying out the method according to the invention.
  • This apparatus comprises a stuffer box having a feed end for insertion of a yarn to be crimped and a discharge end for discharge of crimped yarn therefrom, a pair of driven feed rollers for forcing a yarn into the feed end of the box against a wad of the yarn already crimped within the box, a closable discharge member or means at the discharge end for applying a counterpressure to the wad of yarn, a pickup means for measuring the stuffing pressure (or a quantity that is in a direct and fixed relationship thereto) in the stuffer box at the feed end at the point where the wad of yarn is about to be formed and for producing a signal indicative of this measure value, a control means for actuating the closable discharge means by adjusting an external load thereon in response to a control signal indicative of the difference between the measured value and a reference value of the stuffing pressure, and a transmission means for coupling the pickup means to the control means and for transmitting the
  • FIG. 1 shows, partly in section and partly in elevation, an embodiment of the box-crimping apparatus according to the invention.
  • FIG. 2 shows part of the apparatus of FIG. 1 in side elevation.
  • the box-crimping apparatus is provided with a pair of feed rollers 1 and 2, which are driven in the directions indicated by the arrows and are, for instance, pressed together in a known way by spring pressure. As a result, the yarn 3 to be crimped is forced into the stuifer box 4 in the direction indicated by the arrow.
  • the stutfer box is formed by two walls and 6, which are in contact with the sides of the feed rollers 1 and 2, and by two walls 7 and 8, the top ends of which butt against the circumfen ential surfaces of the feed rollers 1 and 2, respectively.
  • the stutter box 4 may be closed to a varying extent by a closable discharge means in the form of a door 10, which is hingedly attached at 9 and which may apply a counter-pressure to the wad of yarn moving downwards through the stutfer box 4.
  • a slot 12 which locally weakens a portion of the wall 5.
  • a pickup means 13 including a strain gauge.
  • the strain gauge is connected to an appropriate electrical power source and serves to measure the dellection of the wall due to the stuflng pressure applied to the yarn.
  • the electrical resistance of the strain gauge is a function of the deilection of the wall 5, which is in turn dependent on the magnitude of the stufling pressure.
  • the signals transferred via the strain gauge are compared with a desired reference value.
  • comparison may be within the transmission means 14.
  • the diiference between the value measured by the strain gauge and the reference value is amplified in the transmission means 14. Subsequently, the difference gives rise to the formation of a control signal, which is transferred to the control means for the discharge means, which includes solenoid 15.
  • the permanent magnet 16 is displaced in a desired manner for turning the hinged door on the shaft 9, so that the counterpressure applied to the Wad of yarn by the door 10 is varied to maintain the stung pressure at the desired reference value, i.e., the door is moved toward wall 6 to increase the pressure and is moved away from the Wall to decrease the pressure.
  • the crimped yarn is withdrawn from the box and may be wound in a known Way.
  • the stuffing pressure may be measured directly or va quantity that is in a direct and fixed relationship to the stung pressure may be measured and used to control the counterpressure in accordance with this invention.
  • An apparatus for the box-crimping of synthetic yarn which comprises a stuifer box having a Wall for confining the yarn to he crimped, said Wall having a deflectable portion therein, a feed end for the insertion of the yarn to be crimped and a discharge end for discharging crimped yarn therefrom, a pair of driven feed rollers for forcing a synthetic yarn into the feed end against a Wad of yarn already crimped within the box, a closable discharge means at the discharge end for applying a counterpressure to the wad of yam, a pickup means for measuring the deflection of said Wall portion at the feed end at the point where the wad of yarn is about to be formed, which is an indication of the stufling pressure acting on the yarn, and for producing a signal indicative of this measured value, a control means for actuating the closable discharge means in response to a control signal indicative of the difference between the measured value and a reference value of the stuthng pressure and a transmission means for coupling the pickup means to
  • said pickup means includes a strain gauge which is positioned adjacent to said wall portion and which is connected to an electrical power source, the electrical resistance of the gauge being a function of the deilection of said wall portion caused by said stuing pressure whereby signals transmitted via said gauge are indicative of the magnitude of said stuing pressure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US751399A 1967-08-18 1968-08-09 Apparatus for box crimping synthetic yarns Expired - Lifetime US3526023A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6711372A NL6711372A (de) 1967-08-18 1967-08-18

Publications (1)

Publication Number Publication Date
US3526023A true US3526023A (en) 1970-09-01

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Application Number Title Priority Date Filing Date
US751399A Expired - Lifetime US3526023A (en) 1967-08-18 1968-08-09 Apparatus for box crimping synthetic yarns

Country Status (6)

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US (1) US3526023A (de)
DE (1) DE1785129A1 (de)
ES (1) ES357285A1 (de)
FR (1) FR1575455A (de)
GB (1) GB1239287A (de)
NL (1) NL6711372A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765068A (en) * 1970-07-14 1973-10-16 Akzona Inc Process and apparatus for the stufferbox crimping of yarns
US3859695A (en) * 1973-01-05 1975-01-14 Phillips Petroleum Co Stuffer box control
DE2733455A1 (de) * 1977-07-25 1979-02-08 Barmag Barmer Maschf Stauchkammer-texturierverfahren
US4866822A (en) * 1987-03-17 1989-09-19 E. I. Du Pont De Nemours And Company Yarn crimping apparatus and control thereof
US5351374A (en) * 1992-02-07 1994-10-04 Werner Nabulon Method and an apparatus for the continuous crimping of thermoplastic threads
US6134758A (en) * 1999-03-22 2000-10-24 Wellman, Inc. Method of producing improved crimped polyester fibers
US20030080468A1 (en) * 2000-05-18 2003-05-01 Che-Yuan Chang Process of making a corrugated net material
US6572966B1 (en) 1999-03-22 2003-06-03 Wellman, Inc. Polyester fibers having substantially uniform primary and secondary crimps
US20080301922A1 (en) * 2007-06-11 2008-12-11 American Linc Corporation Textile processing assembly, stuffer box, and method for texturing yarn
US20090230583A1 (en) * 2008-03-03 2009-09-17 M.A.E. S.P.A. Apparatus for crimping chemical-fibre filaments and control methods thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2407100A (en) * 1943-06-26 1946-09-03 Gen Electric Drafting of fibers
US2820988A (en) * 1953-05-28 1958-01-28 Inventa Ag Device and a process for controlling the crimping arc in compression crimping of strands of fibers
US2960730A (en) * 1957-06-13 1960-11-22 Bancroft & Sons Co J Crimping apparatus
GB964908A (en) * 1961-07-28 1964-07-29 British Nylon Spinners Ltd Improvements in or relating to the crimping of yarn
US3256569A (en) * 1963-09-24 1966-06-21 Proctor And Schwartz Inc Web density control means for web forming apparatus
US3280444A (en) * 1963-07-10 1966-10-25 Robert K Stanley Strand windup treatment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2407100A (en) * 1943-06-26 1946-09-03 Gen Electric Drafting of fibers
US2820988A (en) * 1953-05-28 1958-01-28 Inventa Ag Device and a process for controlling the crimping arc in compression crimping of strands of fibers
US2960730A (en) * 1957-06-13 1960-11-22 Bancroft & Sons Co J Crimping apparatus
GB964908A (en) * 1961-07-28 1964-07-29 British Nylon Spinners Ltd Improvements in or relating to the crimping of yarn
US3280444A (en) * 1963-07-10 1966-10-25 Robert K Stanley Strand windup treatment
US3256569A (en) * 1963-09-24 1966-06-21 Proctor And Schwartz Inc Web density control means for web forming apparatus

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765068A (en) * 1970-07-14 1973-10-16 Akzona Inc Process and apparatus for the stufferbox crimping of yarns
US3859695A (en) * 1973-01-05 1975-01-14 Phillips Petroleum Co Stuffer box control
DE2733455A1 (de) * 1977-07-25 1979-02-08 Barmag Barmer Maschf Stauchkammer-texturierverfahren
US4408377A (en) * 1977-07-25 1983-10-11 Barmag Barmer Maschinenfabrik Ag Stuffing chamber texturizing process
US4866822A (en) * 1987-03-17 1989-09-19 E. I. Du Pont De Nemours And Company Yarn crimping apparatus and control thereof
US5351374A (en) * 1992-02-07 1994-10-04 Werner Nabulon Method and an apparatus for the continuous crimping of thermoplastic threads
US6134758A (en) * 1999-03-22 2000-10-24 Wellman, Inc. Method of producing improved crimped polyester fibers
US6572966B1 (en) 1999-03-22 2003-06-03 Wellman, Inc. Polyester fibers having substantially uniform primary and secondary crimps
US6706393B2 (en) 1999-03-22 2004-03-16 Wellman, Inc. Polyester fiber tow having substantially uniform primary and secondary crimps
US20030080468A1 (en) * 2000-05-18 2003-05-01 Che-Yuan Chang Process of making a corrugated net material
US7097803B2 (en) * 2000-05-18 2006-08-29 Che-Yuan Chang Process of making a corrugated net material
US20080301922A1 (en) * 2007-06-11 2008-12-11 American Linc Corporation Textile processing assembly, stuffer box, and method for texturing yarn
US7735204B2 (en) * 2007-06-11 2010-06-15 American Linc Corporation Textile processing assembly, stuffer box, and method for texturing yarn
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

Also Published As

Publication number Publication date
DE1785129A1 (de) 1972-01-05
GB1239287A (de) 1971-07-14
FR1575455A (de) 1969-07-18
NL6711372A (de) 1969-02-20
ES357285A1 (es) 1970-03-16

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