US3673650A - Method for producing a thermoplastic synthetic yarn having a latent crimp - Google Patents

Method for producing a thermoplastic synthetic yarn having a latent crimp Download PDF

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Publication number
US3673650A
US3673650A US32796A US3673650DA US3673650A US 3673650 A US3673650 A US 3673650A US 32796 A US32796 A US 32796A US 3673650D A US3673650D A US 3673650DA US 3673650 A US3673650 A US 3673650A
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United States
Prior art keywords
yarn
draw roll
roll
heated
draw
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Expired - Lifetime
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US32796A
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English (en)
Inventor
Giacomo Cerutti
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Bemberg SpA
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Bemberg SpA
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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • D02J1/225—Mechanical characteristics of stretching apparatus
    • D02J1/226—Surface characteristics of guiding or stretching organs
    • 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

Definitions

  • thermoplastic synthetic yarn [58] Field of Search ..264/290,167,l68;28/1, 1.8, is disclosed, by which simultaneously a latent crimp is im- 28/72.1, 72.15, 71.3; 18/] FT parted to the yarn, wherein the yarn is drawn by means of a heated drawing roll, the contact between the yarn and th [56] References Cited heated surface of the roll is not continuous. 1
  • the invention contemplates also the yarn thus obtained and the textile articles made by the yarns as above referred. 2,778,058 1/1957 Gabler ..264/210 Z 2,917,779 12/1959 Kurzke et al.
  • the present invention relates to a method for drawing thermoplastic synthetic yarns and imparting to them simultaneously a latent crimp, in which method the drawing is made by means of two cooperating feeding rolls, rotating at a predetermined peripheral speed, and a heated draw toll, rotating at a peripheral speed greater than the feeding rolls and on which the yarn makes several complete windings.
  • thermoplastic synthetic yarns as for instance polyarnide and polyestere yarns
  • the contact surface of the draw roll with the yarn i.e. the surface corresponding to the exterior circumference of the draw roll, on which the yarn usually makes several windings, is normally a smooth surface or at the most lightly rough surface, but such to assure practically a continuous contact of the yarn or in any case a uniform heating of all the yarn length that winds on the draw roll.
  • thermoplastic synthetic yarns As a result of drawing with a heated draw roll, the thermoplastic synthetic yarns, to which relates the present invention, show a reduced shrinkage, when are subjected to determined treatments, for instance after immersion in boiling water. These yarns do not show however any tendency to crimping after the treatment in boiling water; that means then, they don't show latent crimp. It has been new found that it is possible.
  • the method of the present invention can be realized by drawing the thermoplastic synthetic yarns with a heated draw roll, whose profile is toothed.
  • each tooth head is formed by an arch of the exterior circumference on the toothed draw roll having a length between 1 and 15 mm, each tooth being separated from the adjacent teeth by a distance between 1-15 mm, measured as arch of the exterior circumference of the toothed draw roll.
  • the toothed draw roll as to the present invention, can be heated with any known means: electrically, with a heating fluid, by the radio-frequency field and so on.
  • the temperature of the draw roll contact surface is conveniently included between 100 C and 200 C, according to the nature of the thermoplastic synthetic yarn subjected to the drawing.
  • the empty space between one tooth and the other can be, if wished, filled of heat insulating material, in order to make clearer the difference between the yarn portions having continuous contact with the surface of the teeth head of the drawing roll and the yarn portions not in contact with the heating surface.
  • the yarn l is unwound from the spinning bobbin 2, through the eyelet thread guide 3, by the two feeding rolls 4 and 5, of which 4 is the roll moved positively and 5 is the counter-roll.
  • the grooved thread guide 6 divides the winding turns of the yarn on the counter roll 5.
  • the toothed draw r0 1 7 draws the yarn l in the space included between thefeeding rolls 4 and 5 and the draw roll 7.
  • Thedraw roll 7 is heated.
  • the yarn 1, coming from the feeding rolls, winds several times on the draw roll 7, then passing the idler roll 8 goes towards the winding system formed by a twisting spindle, provided with the ring 9, on which is steadily fixed the tube 10, on which is fonned the yarn package I]; the eyelet thread guide 12 restricts to the top the twisting balloon fonnation.
  • EXAMPLE A polycaprolactam yarn of 20 filaments was drawn on a known drawtwisting machine, having as draw roll, a toothed draw roll, electrically heated.
  • the exterior circumference of the toothed draw roll had a diameter of mm, the teeth number was 38, the distance between the adjacent teeth was 5 mm, for which the length of each tooth head profile was about 5 mm.
  • the yarn was drawn at a speed of 250 m/min and the draw ratio was calculated in such a way to have a final count of 78 dtex and an elongation at break of 35 percent.
  • the toothed roll surface was heated at C.
  • a skein of the yarn so produced was kept in boiling water for 5 minutes. When it dried a remarkable crimp was noticed in the yarn.
  • Another skein of the same yarn was exposed to the saturated steam at the pressure of 1 atm. for 5 minutes. At the end of this treatment, the yarn showed a crimp comparable to the previous one.
  • thermoplastic yarn of the class including polyarnide and polyester yarns and simultaneously imparting thereto a latent crimp said method comprising the steps of positively feeding the yarn at a first rate at a first point and positively feeding the yarn at a spaced second point at a second and greater rate to draw the yarn between said first and second points, and at said second point simultaneously with the drawing of the yarn heating short lengths of the yarn at spaced intervals utilizing solely a heated toothed draw roll about which the yarn passes at least substantially one complete turn to provide firm anchorage of said yarn relative 'to said draw roll for effecting the drawing and heating of said yarn.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US32796A 1969-05-19 1970-04-29 Method for producing a thermoplastic synthetic yarn having a latent crimp Expired - Lifetime US3673650A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1697769 1969-05-19

Publications (1)

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US3673650A true US3673650A (en) 1972-07-04

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US32796A Expired - Lifetime US3673650A (en) 1969-05-19 1970-04-29 Method for producing a thermoplastic synthetic yarn having a latent crimp

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US (1) US3673650A (en))
DE (1) DE2021252A1 (en))
ES (1) ES380092A1 (en))
FR (1) FR2047833A5 (en))
GB (1) GB1288673A (en))
NL (1) NL6911178A (en))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885015A (en) * 1973-01-08 1975-05-20 Mitsubishi Rayon Co Method of processing a heat-shrinkable sheet-like material
US4021520A (en) * 1973-03-17 1977-05-03 Hoechst Aktiengesellschaft Process for the manufacture of filament yarn having protruding filament ends
US4111628A (en) * 1973-10-29 1978-09-05 The Goodyear Tire & Rubber Company Apparatus for vulcanizing continuous lengths of flexible material
US20040217869A1 (en) * 2003-03-26 2004-11-04 Michel Bouchard Vehicle proximity alarm system and method
US8282384B1 (en) * 2011-04-15 2012-10-09 Thomas Michael R Continuous curing and post curing apparatus

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US16215A (en) * 1856-12-09 James reynolds
US2778058A (en) * 1950-01-11 1957-01-22 Inventa Ag Filament stretching apparatus
US2917779A (en) * 1955-05-13 1959-12-22 Hoechst Ag Process for preparing improved thin shaped structures, such as filaments or foils, from linear polyesters
US2930103A (en) * 1954-08-24 1960-03-29 Ind Rayon Corp Tow stretching apparatus
US2975474A (en) * 1958-06-11 1961-03-21 Du Pont Process and apparatus for preparing novelty yarns
US3069726A (en) * 1958-03-04 1962-12-25 Du Pont Process for preparing articles having sections with metallic luster alternating with sections which are clear
US3212158A (en) * 1956-08-31 1965-10-19 Du Pont Process for producing speckled fabric
US3421193A (en) * 1965-03-31 1969-01-14 Burlington Industries Inc Process for crimping multifilament yarn
US3422491A (en) * 1964-09-09 1969-01-21 Asahi Chemical Ind Apparatus for stretching synthetic fibers
US3425206A (en) * 1963-11-12 1969-02-04 Monsanto Co Dyed intermittently textured yarn
US3444682A (en) * 1965-08-10 1969-05-20 Acsa Applic Chimiche Spa Tow treatment for preparation of high-bulk yarns
US3479710A (en) * 1967-12-13 1969-11-25 Stevens & Co Inc J P Textured textile material
US3491418A (en) * 1965-08-11 1970-01-27 Snia Viscosa Apparatus for localized draftin filaments and yarns

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US16215A (en) * 1856-12-09 James reynolds
US2778058A (en) * 1950-01-11 1957-01-22 Inventa Ag Filament stretching apparatus
US2930103A (en) * 1954-08-24 1960-03-29 Ind Rayon Corp Tow stretching apparatus
US2917779A (en) * 1955-05-13 1959-12-22 Hoechst Ag Process for preparing improved thin shaped structures, such as filaments or foils, from linear polyesters
US3212158A (en) * 1956-08-31 1965-10-19 Du Pont Process for producing speckled fabric
US3069726A (en) * 1958-03-04 1962-12-25 Du Pont Process for preparing articles having sections with metallic luster alternating with sections which are clear
US2975474A (en) * 1958-06-11 1961-03-21 Du Pont Process and apparatus for preparing novelty yarns
US3425206A (en) * 1963-11-12 1969-02-04 Monsanto Co Dyed intermittently textured yarn
US3422491A (en) * 1964-09-09 1969-01-21 Asahi Chemical Ind Apparatus for stretching synthetic fibers
US3421193A (en) * 1965-03-31 1969-01-14 Burlington Industries Inc Process for crimping multifilament yarn
US3444682A (en) * 1965-08-10 1969-05-20 Acsa Applic Chimiche Spa Tow treatment for preparation of high-bulk yarns
US3491418A (en) * 1965-08-11 1970-01-27 Snia Viscosa Apparatus for localized draftin filaments and yarns
US3479710A (en) * 1967-12-13 1969-11-25 Stevens & Co Inc J P Textured textile material

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885015A (en) * 1973-01-08 1975-05-20 Mitsubishi Rayon Co Method of processing a heat-shrinkable sheet-like material
US4021520A (en) * 1973-03-17 1977-05-03 Hoechst Aktiengesellschaft Process for the manufacture of filament yarn having protruding filament ends
US4111628A (en) * 1973-10-29 1978-09-05 The Goodyear Tire & Rubber Company Apparatus for vulcanizing continuous lengths of flexible material
US20040217869A1 (en) * 2003-03-26 2004-11-04 Michel Bouchard Vehicle proximity alarm system and method
US8282384B1 (en) * 2011-04-15 2012-10-09 Thomas Michael R Continuous curing and post curing apparatus
US8580175B2 (en) 2011-04-15 2013-11-12 Michael R. Thomas Continuous curing and post-curing method
US9162402B2 (en) 2011-04-15 2015-10-20 Michael R. Thomas Continuous curing and post-curing method

Also Published As

Publication number Publication date
GB1288673A (en)) 1972-09-13
FR2047833A5 (en)) 1971-03-12
DE2021252A1 (de) 1970-11-26
NL6911178A (en)) 1970-11-23
ES380092A1 (es) 1972-08-16

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