US3596334A - Heat-treating process of thermoplastic fibers - Google Patents

Heat-treating process of thermoplastic fibers Download PDF

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US3596334A
US3596334A US80*[A US3596334DA US3596334A US 3596334 A US3596334 A US 3596334A US 3596334D A US3596334D A US 3596334DA US 3596334 A US3596334 A US 3596334A
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fibers
yarn
heat
portions
liquid
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Akira Kobayashi
Atsushi Sugiyama
Hideo Watase
Tadashi Hirakawa
Hiroki Tamura
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Teijin Ltd
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Teijin Ltd
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
    • D06P5/20—Physical treatments affecting dyeing, e.g. ultrasonic or electric
    • D06P5/2066—Thermic treatments of textile materials
    • D06P5/2072—Thermic treatments of textile materials before dyeing
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
    • 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
    • D02J1/221—Preliminary treatments
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B11/00—Treatment of selected parts of textile materials, e.g. partial dyeing
    • D06B11/0079—Local modifications of the ability of the textile material to receive the treating materials, (e.g. its dyeability)
    • D06B11/0086—Local modifications of the ability of the textile material to receive the treating materials, (e.g. its dyeability) the textile material being one or more yarns

Definitions

  • This invention relates to a heat-treating process of thermoplastic fibers.
  • a liquid having a relatively large latent heat of vaporization or specific heat which is inert to the fibers is nonuniformly applied to the fiber surfaces.
  • pretreated fibers exhibit, after the aforesaid heat treatment, nonuniform dyeability (this property is expressed as different dyeability" in the specification) and/or nonuniformly crimped state.
  • conjugate fibers having nonuniform latent crimpability can be prepared in accordance with the subject process.
  • the liquid should never have any dissolving ability of the fibers to be treated, under the treating conditions. Water is the optimum liquid, for both handling and economical reasons.
  • nonuniform application denotes the state wherein such a liquid is applied onto the entire surfaces of the thermoplastic fibers to be treated, with the pickup varying along the direction of axis and/or the circumferential direction of the fibers; or the state wherein the liquid is applied intermittently onto the fiber surfaces along the axial direction, with uniform or varying pickup. If expressed in more concrete manner, in a typical example, liquid-applied portions (A) and non-liquid-applied portions (B) are formed on the fiber surface. Manner of forming the portions (A) and (B) is not critical.
  • the portions (A) and (B) may be arranged alternately at regular intervals along the longitudinal direction of the fibers. Or, the portions (B) may be present at random in the portion (A).
  • Our expected result of heat treating the so pretreated fibers at the already described high temperatures was that, while the portions (8) would exhibit high dyeability since they directly contact the high-temperature atmosphere, the portions (A) would be shielded from the action of heat by the liquid covering the same portions.
  • the heating time to be employed is extremely short, the fibers themselves are scarcely heated during the heat treatment, if they are covered by the liquid.
  • the quantity of heat applied to the portions (A) would be very low, while that applied to the portions (B) would be high.
  • the present invention succeeded in the preparation of fibers'having nonuniform dyeability and/or nonuniform crimping property, by the combined steps of nonuniformly applying a liquid having a relatively large latent heat of vaporization or specific heat, such as water, onto the surfaces of thermoplastic, synthetic fibers, and heat-treating the same fibers at the specified high temperatures for an extremely short time.
  • the invention also succeeded in the preparation of fibers having nonuniform latent crimpability, by applying the same process to conjugate fibers having latent crimpability.
  • FIG. 1 is a schematic view showing one example of the apparatus suitable for practicing the subject process
  • FIG. 2 is a schematic view showing one example of the apparatus for heating the fibers in accordance with the inventron
  • FIGS. 3 and 4 are the schematic views showing modifications of the apparatus for applying the liquid onto the fibers
  • FIG. 5 is an enlarged side view of one example of dyed polyester fibers having different dyeability, which has been prepared in accordance with the invention
  • FIG. 6 is an enlarged side view nonuniformly crimped fibers obtained by applying the process of this invention to already crimped, thermoplastic fibers,
  • FIG. 7 is an enlarged side view ofdyed fibers exhibiting both nonuniform crimpability and different dyeability, which are obtained by applying the subject process to already crimped polyester fibers,
  • FIG. 8 is an enlarged side view of the fibers obtained by applying the subject process to conjugate fibers having latent crimpability and thereafter treating them in boiling water in relaxed state,
  • FIG. 9 is a graph showing the relationship between the heattreating temperature and relative dyeability of polyester-type
  • FIG. 10 is a graph showing the empirically obtained cor-rela- I tion of heat-treating temperature and time of polyester-type fibers
  • FIG. 11 is a graph showing the empirically obtained correlation of heat-treating temperature and residual crimp ratio demonstrated by crimped polyethylene terephthalate fibers
  • FIG. 12 is a graph showing the empirically obtained correlation of heat-treating temperature and time of crimped polyethylene terephthalate fibers
  • FIG. 13 is a graph showing the empirically obtained correlation of heat-treating temperature and time of crimped poly-ecapramide fibers
  • FIG. 14 is a graph showing the correlation of the heat-treating temperature with shrinkages of polyethylene terephthalate fibers and polyethylene terephthalate-isophthalate fiber in boiling water.
  • yarn 1 is fed from the feed rollers 2, passed through the heating device 4 via a liquid supply roller 3, and withdrawn by winder'6 via takeup rollers5.
  • the liquid can be applied to the yarn intermittently along the axial direction thereof, by the use of roller 3 provided with regular or irregular teeth, at least the teeth portion thereof being immersed in the liquid stored in the bath 3.
  • roller 3 provided with regular or irregular teeth, at least the teeth portion thereof being immersed in the liquid stored in the bath 3.
  • the liquid pickup of the yarn varies depending on such factors as advance rate of the yarn, rotation speed of the roller and shape and number of teeth. It is also possible to employ plural liquid supply rollers to effect various liquidapplication patterns along the axial directionof yarn or fiber.
  • the liquid application device is obviously not limited to the roller 3 employed in the embodiment ofFlG. l, but any suitable device maybe used so far as the described purpose of liquid application is accomplished.
  • the liquid may be allowed to fall down-in fine streams on .the running yarn 1 from a small-diameter tube 10, the liquid flow being intermittentlyinterrupted by a sector 9 which is rotating inthe direction of arrow, as illustrated in FIG. 3.
  • a sector 9 which is rotating inthe direction of arrow, as illustrated in FIG. 3.
  • plural sectors 9 may be used to produce various nonuniform liquid application patterns.
  • a spray 11 may be used in place of the roller 3.
  • various nonuniform liquid application patterns along the axial direction of yarn can be obtained likewise, by continuous or intermittent spraying of the liquid.
  • a gaseous substance is most preferred.
  • a gaseous substance of the desired high temperature such as air, nitrogen or steam, etc.
  • the gas of predetermined temperature may be supplied from the entrance 7 atone end of the cylindrical room 4, and the said gas may be discharged through an exit 8 at the opposite end.
  • Similar heating effect can be obtained by means other than the device of FIG. 1, such as irradiation of running yarn with infrared rays,'or installation of electrotherrnic wire in the surrounding walls ofa cylindrical heating chamber.
  • the temperature of heat treatment in accordance with the present invention isnot lower than the meltingpoint of the thermoplastic synthetic fibers to be treated.
  • the heat-treating temperature refers to the temperature of .the heating medium in the vicinity of the fiber surfaces under treatment in the heating zone, which can be determined by conventional means, with a thermocouple, for example.
  • the effect of such heat treatment depends mainly on the temperature employed and the duration time.
  • the time can be determined from velocity of yarn passing through the heating zone and length of the heating zone.
  • the time should be instantaneous, in the order of one-hundredth to one-tenth of a second. Too short a heattreating time, however, fails to achieve the satisfactory result. Whereas, excessively long treating time will cause complete melting of the fibers, rendering the process inoperable.
  • the treating temperature is within the range from melting point of the treated fibers to 2,000 C., and the time is in the range from 0.0l0.9 second.
  • the portions of the treated fibers not shielded by the inert liquid tend to be molten, and shielding effect of the liquid atthe other portions is reduced or nullified, since the temperatureis so high as not lower than, the melting point of the fibers.
  • appropriate heat-treating time is not longer than 0.9 second, in accordance with thebasic concept of the invention to instantaneously subject the fibers remarkably nonuniform properties by the hightemperature treatment, and also from the standpoint of economical operation.
  • the heat-treating temperature and time should be selected from the abovespecified ranges, regardless the. type or size of the fibers to be treated. Appropriate combination of the temperature and time varies somewhat, depending on the desired product as follows.
  • FIG. 5 An example of polyester fibers to which the subject process has been applied is shown in FIG. 5.
  • the specimen is that which is dyed after the heat treatment.
  • the imparting of different dyeability is aimed at.
  • the portions A Showing low dyeability are those which were applied with the liquid, and consequently not or little heated.
  • the portions B showing high dyeability were not applied with the liquid and therefore, heated directly.
  • Such different dyeability in accordance with the invention can be conveniently imparted to such polyester fibers from homoor co-polyesters in which all or predominant portion of acid component is terephthalic acid, and all or predominant por tion of glycol component is ethylene glycol; and fibers from the blends containing such homoor co-polyesters as themain components.
  • Such fibers are prepared by conventional spinning and subsequent drawing with optional heat treatment. Multifilamentary .yarns are particularly preferred.
  • the polyester fibers treated in accordance with the subject invention exhibit distinct different dyeability, and simultaneously retain mechanical properties satisfactory for various practical usages.
  • the correlation of heat-treating temperature with relative dyeability is as illustratedin FIG. 9.
  • the data of FIG. 9 are provided by a polyethylene terephthalate yarn heated in hightemperature air for 0. l5 second, under a tension of 0.08 g./d. It can be clearly understood from the graph that the satisfactory dyeability is obtained in the heated air of temperatures above the melting point of the sample yarn (260 C.). The dyeability remarkably improves with the temperature rise above the melting point. That tendency is invariably very distinct.
  • the portions A, applied with the liquid in advance are little influenced by the heat during the heat treatment, and consequently exhibit little heat treatment effect, that is, low dyeability.
  • the portions 8, are directly heated and showed high heat treat ment effect, that is, high dyeability.
  • the portions A, and B are directly heated and showed high heat treat ment effect, that is, high dyeability.
  • the term relative dyeability refers to the values determined as follows.
  • the sample fibers are dyed in a boiling dye bath of Dispersol Fast Scarlet B, 4 percent o.w.f. for 30 minutes, and 50 mg. of the dyed fibers are dissolved in 20 cc. of ortho-chlorophenol.
  • the relative dyeability is determined by measuring the optical density of thus obtained solution of 5 15 mp.., expressed in index number with reference to so measured optical density of nontreated sample fibers as 1.
  • the heat-treating time (I) expressed by second differs for each specific type of fibers. For example, for large denier fibers, longer (I) is required.
  • T( C. is the treating temperature
  • Tm(C.) is the melting point of the polyester fibers.
  • logT-logTm -O.3900.588 log t (0,).
  • the area filled with double diagonal lines on FIG. may be considered as denoting the optimum application range of this invention. It can be easily understood that, when the denier of the fibers to be treated is increased, the said area on the graph is shifted to the side of higher temperature and longer time. Likewise, when the total denier of the fiber is decreased, the area is shifted to the side of lower temperature and shorter time. This general rule also applied in the below-described cases (2) and (3).
  • thermoplastic fibers to be treated must be crimped in advance.
  • the crimping as a pretreatment is effected substantially uniformly, over the entire length of the fibers.
  • product of applying the subject process to a crimped thermoplastic fiber is illustrated in FIG. 6, in which densely crimped portions A and scarcely crimped portions B appear alternately along the axial direction.
  • the portions A are those to which an inert liquid was applied in advance, and which were hardly heated.
  • the entire fibers were in crimped state as the portions A After the nonuniform liquid application and a high temperature treatment in accordance with the present invention, the crimps in portions B, (which were directly heated) vanished.
  • Residual crimp ratio Referring to FIG. ll, the axis of abscissae represents heattreating temperature, and that of ordinates, the above residual crimp ratio. From the graph it can be understood that the crimps are reduced or eliminatedwithin extremely short time, by the heat treatment at temperatures above the melting point of the fibers (in the illustrated case, 265 C.).
  • the nonuniformly crimped state of the fibers obtained in accordance with the invention is furthermore variable by such practices as nonuniform liquid application over the entire surfaces of the crimped fibers, intermittent but regular liquid application along the axial direction of the fibers, intermittent and irregular liquid application, etc.
  • heat-treating effect depends mainly on the treating temperature and time. That is, less time is required for achieving the intended result, under higher temperatures, increasing efficiency of the process. In any case it is necessary for obtaining the intended fibers of irregular crimps, to secure definite difference in crimping states of the fiber portions applied with an inert liquid, and of the portions not applied with the liquid. In terms of residual crimp ratio, the difference should preferably correspond to that of at least 15 percent.
  • the conditions of such a treating system should be selected in consideration of the above requirement.
  • logT-logTm 0.775-O.652 log t 1 As to the upper limit
  • thermoplastic, synthetic fibers to which the above differential-crimping can be applied include all the fibers made of thermoplastic polymers, such as polyester, polyamide, polyvinyl, and polyolefin fibers, etc.
  • the manner of crimping and processing given to the fibers as a pretreatment to the subject process is not critical. That is, crimped fibers prepared by any known method such as false twist, edge crimp, etc. are usable. I
  • the differing degree of crimping states can be optionally varied over a wide range, from distinct contrast to slightly visible difference.
  • the product fibers are formed into knit or woven goods, the exhibit excellent properties such as unique feeling and hand, appearance, and high bulkiness.
  • the portions A were applied with an inert liquid, and therefore were scarcely heated, consequently exhibiting little difference in crimp density and dyeability from those of the untreated crimped fibers.
  • the portions B were directly exposed to the heating, in which the crimps are eliminated and'high dyeability is exhibited.
  • Latent, nonuniform crimpability can be imparted to conjugate fibers also in accordance with the present invention.
  • This particular embodiment is applicable to latently crimpable conjugate fibers which exhibit crimps when heat-treated in relaxed state, for example, polyester and polyamide conjugate fibers.
  • the material conjugate fibers may be undrawn, drawn, or heat-treated under conditions as will not render the fibers crimped, preceding the application of subject process.
  • the axis of ordinates represents the shrinkage of fiber in boiling water, and that of abscissae, heattreating temperature in accordance with the present invention.
  • 41 denotes the polyethylene terephthalate fibers of 75 denier/36 filaments, and e," a copolymer fibers of polyethylene terephthalate containing 10 wt. percent of isophthalic acid on the basis of total acid components, of 75 denier/36 filaments.
  • the treating time employed was 0.04 second at all temperatures.
  • a conjugate fiber composed of the polyethylene terephthalate and polyethylene terephthalate'isophthalate copolymer having thermal shrinkages in boiling water, respectively, 7 percent and 12.3 percent possesses latent crimpability.
  • the difference in thermal shrinkages of the components is reduced with the temperature rise in the heat treatment, and the latent crimpability of the conjugate fiber is changed. ln the embodiment illustrated in FIG. 14, the difference in thermal shrinkages can be reduced to substantially zero.
  • the conjugate fiber whereupon loses the latent crimpability.
  • FIG. 8 the product of an embodiment in which an inert liquid is applied to a latently crimpable yarn at regular intervals along the axial direction thereof is shown in FIG. 8.
  • the drawing shows the state of the yarn after a boiling water treatment for approximately 30 minutes in relaxed state, following the treatment of this invention.
  • the yarn thus developed crimps in the portions A. which were applied with the liquid and consequently received little effect of heat.
  • B denotes the portions of the yarn directly exposed to the heat.
  • This invention is continuously operable at a very high speed, e.g., fibers can be processed accordingly at a rate as high as 1,000 m./min.
  • the process can be practiced as one stage of a series of continuous treatments, following, drawing step or various crimping process; or, can be practiced as a separate, independent treatment; with simple operation and high efficiency.
  • Dispersol Fast Scalet B showed a marked pepper-and-salt pattern of deep and light shades.
  • the so treated yarn had a tenacity of 4.8 g./d., an elongation of 19.5 percent and a Young's modulus of 76.5 g./d.
  • the yarn before treatment had a tenacity of4.9 g./d., an elongation of 25.9 percent and a Young's modulus of 88.9 g./d.
  • the experiment was carried out changing only the treatment temperature to 250 C., a gradation in shade was not observed.
  • Example 3 The polyethylene terephthalate yarn used in Example 2 was treated as in Example 1 excepting that a treatment temperature of 750 C., a takeup speed of 300 meters per minute and a tension at the time of treatment of0.0 27 g./d. were employed. A distinct pepper-andasalt-like gradation in shade was observed in the treated yarn upon dyeing, and this yarn had a tenacity of 3.9 g./d., an elongation of 32 percent and a Youngs modulus of 43.2 g./d.
  • Example 4 The polyethylene terephthalate yarn used in Example 1, in being heat-treated employing a heat treatment apparatus as used in Example 1, was first applied water intermittently along its longitudinal axial direction with a liquid imparting device such as shown in FIG. 3 and thereafter was submitted continuously to a heat treatment in heated air of 580 C. under a tension of 0.27 g./d. at a takeup speed of meters per minute.
  • the so obtained yarn upon being dyed exhibited marked gradation in shade at a periodicity of 15 centimeters.
  • the deep color portion of the treated fiber had a tenacity of 4.7 g./d., an elongation of 22.6 percent and a Young's modulus of 77.4 g./d. and thus retained its mechanical properties to an extent as to be fully adequate for practical purposes.
  • Control I The experiment was operated exactly as in Example 4, excepting that a treatment temperature of 300 C. was used. However, in this case the treatment time was insufficient and, as a result, a pattern in which there was a gradation in shade did not appear in the treated yarn upon being dyed. On the other hand, when the same experiment was attempted but with a treatment temperature of l,200 C., the heat treatment effects were too excessive, with the consequence that the yarn melted and broke to render it impossible of continuing the experiment.
  • Example 5 A polyethylene terephthalate yarn imparted crimps by false twist method (l50 denier/48 filaments) was treated in heated air of 450 C. at delivery and takeup speeds of I50 meters per minute, using the heat treatment apparatus as employed in Example I. At this time carbon tetrachloride was intermittently applied to the yarn by using the apparatus shown in FIG. 3, the application being accomplished by allowing the carbon tetrachloride to flow down as a fine stream at before the entrance to the heated tube and intermittently cutting this stream at a point above the yarn. The so treated yarn turned out to be one having at intervals of about l meters about 50 centimeters of portions where the crimp was slight.
  • Example 6 A poly-s-capramide yarn (70 deniers/ l 2 filaments) imparted crimps by false twist method was treated at a treatment temperature of 800 C. and delivery and takeup speeds of 300 meters per minute, using the heat treatment apparatus as used in Example I. At this time water was applied intermittently as well as irregularly to the yarn by contacting the yarn with a piece of felt at before the entrance to theheated tube by which water was constantly fed to the yarn liy capillarity and by disposing at a point immediately before the point at which the piece of felt contacts the yarn a means for intermittently separating said piece of felt from the yarn.
  • the so treated yarn turned out to be one having at intervals of 5 meters to meters portions about 50 centimeters in length where the crimp was slight.
  • Example 7 A poly-e-capramide yarn identical to that of Example 6 was treated with the same heat treatment apparatus as used therein, at a treatment temperature of 500 C. and delivery' and takeup speeds of l00 meters per minute, water being applied in this case with the liquid imparting apparatus shown in FIG. 1.
  • the so treated yarn turned out to be one having intermittently along its longitudinal direction portions about 50 centimeters in length which were completely devoid of crimps and other portions about 5 meters to l0 meters in length where crimps identical to those in the yarn originally fed were retained intact.
  • Example 8 A polyethylene terephthalate yarn identical to that of Example 5 was heat treated using the heat treatment apparatus employed in Example 1, the treatment being carried out continuously in heated air of 700 C., at delivery and takeup speeds of l50 meters per minute and with application of substantially no tension. At this time water was applied intermittently and irregularly to the yarn by the provision, as shown in FIG. 1 at a point l0 centimeters before the entrance to the heated tube and longitudinally of the yarn, of two rollers having partially cutaway portions, the two rollers being operated at different peripheral speeds in applying the water.
  • the sotreated yarn turned out to be one having portions intermittently and randomly spaced wherein there were completely no crimps for a distance of 3 centimeters to centimeters at intervals of 0.3 meter to 20 meters. Those portions of the yarn to which water had been applied retained intact the crimps that were present in the originally fed yarn.
  • Example 9 A polyethylene terephthalate yarn (75 denier/36 filaments) imparted crimps by false twist method was treated using the heating apparatus as used in Example 1, a temperature of the heated air of 650 C. and liquid paraffin as the liquid applied but otherwise by the same procedure and under identical conditions as in Example 8.
  • Example 10 A polyethylene terephthalate yarn identical to that of Example 9 was treated by means of the same apparatus as employed therein and under identical conditions. At this time carbon tetrachloride was intermittently applied with the liquid-imparting apparatus as used in Example 6.
  • Example I l A SO-total-denier, 24-filament polyethylene terephthalate yarn having crimps imparted by false twist method was treated using the apparatus as in Example I, a treatment temperature of 600 C. and delivery and takeup speeds of 300 meters per minute. At this time water was applied to the yarn at a, point 10 centimeters before the entrance to the heated tube using a pair of water-imparting rollers having indentations and rotating at different peripheral speeds. The so-treated yarn turned out to be one having intermittently and at random portions 3 centimeters to 5 centimeters having no crimps, which were spaced at intervals of 30 centimeters to 2 meters.
  • Example l l was repeated except that a treatment temperature of 270 C. and a treatment speed of 300 meters per minute were used.
  • the crimps of those portions to which water was not applied were not changed in the least, i.e., they were in an identical state as before the treatment. Hence, a gradation in shade did not develop upon dyeing.
  • Example 6 was repeated except that a treatment temperature of 400 C. In this case, due to the insufficiency of the treatment time, no change whatsoever was noted in the crimps of the portions to which water was not applied. On the other hand, when the same experiment was attempted with a treatment temperature of 1,000 C., the heat treatment effect being so great the yarn melted and broke ble to continue the experiment.
  • Example 13 A drawn side-by-side type latently crimpable'conjugate yarn (45 denier/7filaments) composed of polyhexmethylene adipamide (m.p. about 265 C.) and 20 wt. percent hexamethylene sebacamide-copolymerized polyhexamethylene adipamide (m.p.
  • Example 14 A latently crimpable conjugate yarn identical to that of Example l3 was heat treated by using the heat treatment apparatus as in-Example l at a heat treatment temperature of 900 C. at delivery and takeup speeds of 300 meters per minute.
  • Example 15 A drawn side-by-side type latently crimpable conjugate yarn (75 denier/l2 filaments) composed of polyethylene terephthalate (m.p. about 260 C.) and 10 wt. percent isophthalic acid-copolymerized polyethylene terephthalate (m.p. about 240 C. )was heat treated as in Example 13 by passing the yarn through heated air of 910 C.
  • Example 16 Carbon tetrachloride was sprayed against the latently crimpable conjugate yarn of Example 15 using the sprayer shown in FIG. 4, following which the yarn was heat-treated in heated air of 400 C. by using the heat treatment apparatus as in Example 1 at delivery and takeup speeds of 70 meters per minute. When the so treated yarn was submitted a relaxation treatment for 30 minutes in boiling water, an irregular and complicated crimp pattern was developed along the axial direction of the yarn.
  • thermoplastic fibers having a crimped configuration so as to impart nonuniform crimp thereto which process comprises nonuniformly applying to said thermoplastic fibers a liquid which is inert to said thermoplastic fibers, has a relatively large latent heat of vaporization and substantially no dissolving action for said thermoplastic fibers, and subsequently subjecting said thermoplastic fibers having said inert liquid nonuniformly thereon to a noncontact heat treatment atmosphere maintained at a temperature above the melting point of said thermoplastic fibers for a period of 0.01 to 0.9 seconds, so as to remove the crimp of said thermoplastic fibers at those portions where said inert liquid is not applied.
  • thermoplastic fibers are polyester fibers.

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US4383404A (en) * 1981-08-26 1983-05-17 Milliken Research Corporation Method and apparatus to produce post heated textured yarn
US4472220A (en) * 1981-11-12 1984-09-18 Camac Corporation Textile detexturizing system

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Publication number Priority date Publication date Assignee Title
US4567721A (en) * 1983-11-01 1986-02-04 Teijin Limited Method for producing textured yarn

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US3129485A (en) * 1961-06-30 1964-04-21 Bancroft & Sons Co J Production of novelty bulked yarn
US3284871A (en) * 1961-12-28 1966-11-15 Toyo Rayon Co Ltd Intermittently-crimped filament and the method for the production thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129485A (en) * 1961-06-30 1964-04-21 Bancroft & Sons Co J Production of novelty bulked yarn
US3284871A (en) * 1961-12-28 1966-11-15 Toyo Rayon Co Ltd Intermittently-crimped filament and the method for the production thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383404A (en) * 1981-08-26 1983-05-17 Milliken Research Corporation Method and apparatus to produce post heated textured yarn
US4472220A (en) * 1981-11-12 1984-09-18 Camac Corporation Textile detexturizing system

Also Published As

Publication number Publication date
FR2004614A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1969-11-28
GB1261612A (en) 1972-01-26
CH520798A (de) 1971-12-15
CH440769A4 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1971-12-15
CA929718A (en) 1973-07-10
NL6904497A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1969-09-25
DE1914557B2 (de) 1975-08-14
DE1914557A1 (de) 1970-12-23

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