US3826075A - Process for producing a bulky yarn - Google Patents

Process for producing a bulky yarn Download PDF

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US3826075A
US3826075A US00209115A US20911571A US3826075A US 3826075 A US3826075 A US 3826075A US 00209115 A US00209115 A US 00209115A US 20911571 A US20911571 A US 20911571A US 3826075 A US3826075 A US 3826075A
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yarn
heater
fluid nozzle
twisting
fluid
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K Asada
F Maruyama
T Yasui
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Teijin Ltd
Teijin Frontier Knitting Co Ltd
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Teijin Ltd
Teijin Modern Yarn Co Ltd
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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
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D02G1/0206—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting
    • D02G1/0226—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting multiple false-twisting

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  • PROCESS FOR PRODUCING A BULKY YARN Inventors: Fumishige Maruyama; Toshiyuki Yasui; Kaoru Asada, all of Komatsu, Japan Teijin Limited, Osaka; Teiiin Modern Yarn Co., Ltd., Komatsu-shi, lshikawa-ken, both of, Japan Filed: Dec. 17, 1971 Appl. No.: 209,115
  • ABSTRACT A method of producing a bulky yarn having a controlled residual torque, which comprises subjecting a thermoplastic synthetic filament yarn to a series of twisting, heat-setting on a first heater, and untwisting, feeding the yarn into a second heater while rotating it by means of a fluid nozzle and re-heat-setting the yarn in the second heater, the yarn being maintained in a substantially relaxed state during the rotation by the fluid nozzle and the re-heat-setting by the second heater.
  • This invention relates to a process for producing a yarn having high bulk and controlled residual torque. More specifically, the invention relates to a process for producing a bulky yarn having controlled residual torque by subjecting a thermoplastic synthetic filament yarn to a continuous series of twisting, heat-setting, and untwisting steps, and then again heat-treating it in a substantially relaxed condition.
  • a number of methods have been proposed previously for the production of bulky yarns. These methods, for example, include a method comprising three steps of heating, heatsetting, and untwisting (German Pat. No. 618,050 and Japanese Pat. No. l30,429), the so-called false-twisting method in which heating, heat-setting, and untwisting are performed in one step (British Pat. No. 424,880), a modified false twist method wherein bulky yarns obtained by false-twisting are simultaneously heat-set, and a method wherein the bulky yarns obtained by false-twisting are again heat-set by heating.
  • the bulky yarns produced by these methods have different forms of crimp or yarn quality such as crimpability. These conventional methods, however, cannot at all exert a free control of the residual torque while retaining the desirable bulkiness.
  • Yarns produced by a series of twisting, heatsetting, and untwisting steps have a very large residual torque.
  • a modified falsetwisting method (to be referred to as the two-heater method) in which the yarn is continuously passed between two heaters on a false twisting machine to set the crimps, and a method (to be referred to as the package set method) wherein a cheese of a falsetwisted yarn is heat-treated to set the crimp have been proposed.
  • Japanese Patent Publication No. 16,688/64 proposes the production of a bulky yarn that can be handled in the form of a single yarn by using a contact heater having a curved surface in the reheating process and passing the yarn between a first hollow spindle and a second hollow spindle. By this method, however, sufficient bulkiness cannot be imparted to the yarns.
  • the method disclosed in the specification of Japanese Patent Publication No. 28,260/68 comprises falsetwisting and heat-setting at least two yarns doubled with each other, applying to the yarns after passage of a falsetwisting spinner a weak twist in a direction opposite to the false-twisting direction before they reach a twistsetting pin or a spreading pin, re-heatsetting the bundle of yarns at this point, and then spreading the bundle yarn into the individual yarns.
  • This method however, has defects in operation, and since the yarn is treated under tension by the second heater, sufficient bulkiness cannot be imparted to the yarn.
  • the above-mentioned package setting method is continuously performed. Specifically, a yarn false-twisted by a first heater is treated continuously with heated steam at an overfeed rate of 0 to 30 percent. This, however, has operational difficulties, and cannot reduce the residual torque to the extent achieved by the package set method.
  • An object of the present invention is to overcome the difficulties of the prior art methods described above, and to provide a novel method of continuously producing bulky synthetic filament yarns whose residual torques have been freely controlled without impairing the bulkiness of the yarns.
  • a method is provided of producing a bulky yarn of controlled residual torque, which comprises subjecting a yarn to a series of twisting, heat-setting on a first heater, and untwisting, feeding the yarn into a second heater while rotating it by a fluid nozzle and re-heatsetting the yarn in a second heater, the yarn being maintained in a substantially relaxed condition during the rotation by the fluid nozzle and re-heatsetting by a second heater.
  • the present invention provides a bulky yarn of increased torque capable of being applied to non-torque or de chin, etc.
  • FIG. 1 is a schematic view illustrating the entire process of the method of the present invention
  • FIG. 2 is a sectional view showing one embodiment of the fluid nozzle
  • FIG. 3 is a view illustrating the relative positions of the second heater, fluid nozzle and twist-nipping point
  • FIGS. 4-7 show vertical views of preferred embodiments of a second heater used in the invention.
  • FIGS. 8-11 show end views of FIGS. 4-7, respectively.
  • a starting yarn 2 is withdrawn from a bobbin 1 by a pair of feed rollers 3, and delivered onto a first heater 4.
  • the yarn is twisted by a spindle 5, and subjected to a first heat-setting by the first heater 4.
  • the yarn is delivered onto a second heater 7 by first delivery rollers 6 while overfeeding.
  • the yarn is rotated by a fluid nozzle 8, delivered by second delivery rollers 9, and then wound up on a cheese 11 by a windup roller to thereby provide the intended product.
  • the yarn must be naturally or forcedly cooled between the outlet of the first heater 4 and the spindle 5, and between the outlet of the second heater 7 and the second delivery roller 9.
  • the first delivery rollers 6 and the second delivery rollers 9 are helpful.
  • the step of twisting, heat-setting on the first heater, and untwisting can be performed by any known method.
  • the most characteristic feature of the method of the present invention is that a yarn which has been subjected to such twisting, first heatsetting and untwisting is fed to the second heater while being rotated by a fluid nozzle, and during this time, the yarn is maintained in a substantially relaxed condition.
  • This substantially relaxed condition means that a tension in excess of 0.070 g/denier is not exerted on the running yarn.
  • the application of a tension not in excess of 0.050 g/denier is preferred, and most preferably, the tension should not exceed 0.025 g/denier.
  • the preferred overfeed rate is at least 6 percent, and more preferably, it is at least 10 percent.
  • the overfeed rate is usually 60 percent, preferably 50 percent, and more preferably 40 percent.
  • the overfeed rate is usually 60 percent, preferably 50 percent, and more preferably 40 percent.
  • the fluid nozzle has a function of introducing a stream of fluid in the non-axial direction into a twisting path and bringing it into direct collision with a filament yam which has been fed into the twisting path and is moving at high speed under low tension, eccentrically with respect to the longitudinal axis of the yarn, to thereby give twists to the yarn.
  • Fluid nozzles per se based on such theory have previously been used for twisting yarns, and are well known. These fluid nozzles differ somewhat in structure, but all of them can be used in the present invention.
  • Several of the preferred fluid nozzles are disclosed in Japanese Patent Publications Nos. 11,348/61, 11,349/61, 11,350/61 and 11,266/62. Of these, the nozzles disclosed in Japanese Patent Publications No. l 1,266/62 are especially preferred, and has the structure as shown in FIG. 2.
  • a fluid introduced from a fluid inlet 12 enters a hollow portion 15 of a main nozzle body 14.
  • the hollow portion 15 is provided eccentrically with a flow passageway 13, so that the fluid which has flowed into the hollow portion 15 is rotated.
  • the rotating direction can be freely changed by changing the position of the flow passageway 13.
  • the fluid nozzle may be provided before or after the second heater. Generally, it is preferred to provide it after the second heater in view of the installation space of the nozzle and the lowering of the temperature of the heater due to the inflow of the fluid.
  • Examples of the fluid that can be used in the present invention are inset gases such as nitrogen, neon, crypton, argon, helium, carbon dioxide gas, or air, and steam or water. Because of availability and ease of handling, air is preferably used.
  • the pressure of the fluid can vary according to the kind of fluid, the structure of the fluid nozzle, and the desired torque, but is generally in the range of about 0.05 kg/cm (gauge) to 2.0 kg/cm (gauge).
  • the second heater used in the invention is of any type which can maintain the yarn in a relaxed condition within the heater and does not permit the full contact of the yarn with the heater.
  • the second heater include pipe heaters in which the yarn path is hollow, slit type heaters in which the yarn path is a slitlike opening in the direction of yarn travel, or heaters of the type wherein a yarn guiding wire or plate is secured to a desired place on the curved surface in the direction of yarn travel so as to avoid the full contact of the yarn with the heater.
  • the pipe heaters which are straight in the direction of yarn travel are preferably used.
  • FIGS. 4-7 and 8-11 The vertical and cross sectional surfaces of the four preferred embodiments of the second heaters are illustrated in FIGS. 4-7 and 8-11, respectively. These heaters are of the type which permit contact of the yarn only at the inlet and outlet ends. In FIGS. 4-7, the heater is shown at 7, and the running yarn at 2.
  • the heaters of FIGS. 4, 5, and 6 do not include a guide for the running yarn, and the heater of FIG. 7 includes guides (16).
  • the positions of contact of the yarn with the heater are indicated by f and f.
  • the heaters of FIGS. 5 and 6 are obtained by providing the pipe heater 4 with a slit or an opening of larger width, and permit easy yarn stringing operation. Guides can be provided in the heaters of FIGS. 5 and 6 also, as in FIG. 7.
  • the contact positions of the yarn at the inlet and outlet ends of the heater are such that within the inner space of the heater, the yarn does not come into full contact with the wall surface of the heater.
  • the two contact points should oppose each other as much as possible. It is however preferred that when the inlet contact point (1) and the outlet contact point (1" are projected on a cross sectional plane perpendicular to the axis of the heater, an angle formed by lines connecting two projected points respectively with the center of the circle is at least preferably at least more preferably at least When these two contact points are selected so as to be situated opposite to each other, the angle is 180.
  • the above condition is applicable to a heater of the type wherein the shape of the cross sectional surface of its inner space is an ellipse in which the ratio of the long axis to the short axis is not more than 20. While the above discussion has been directed primarily to heaters of circular or elliptical cross section, the shape of the heater is not limited to these shapes. The requirement is that the yarn should not be placed under excessive tension by excessive contact with the wall surface of the heater.
  • the yarn is twisted by a rotating stream in the twisting path of the fluid, and therefore, the position of securing the fluid nozzle is important in performing the method of the invention industrially.
  • the hydrodynamic resistance of the fluid within the fluid nozzle and other yarn twisting portions in contact with yarn guides is very stable and the amount of fluid to be used for giving the same residual torque is also small.
  • the wear of the material of structure on the surface in contact with the yarn is very small, and it is possible to use an inexpensive material of low wear resistance, and it becomes possible to produce a bulky yarn having any desired residual torque with economical advantage.
  • the preferred 1, is at least 1.0 cm, preferably about 1.5 cm. There is no upper limit for l, but with increasing 1,, more space is needed on the falsetwisting machine.
  • the upper limit of the distance is generally cm, preferably 10 cm.
  • the angle 6, is preferably larger than 0. if the angle 6 is below 0, the residual torque differs greatly from spindle to spindle. On the other hand, it the angle exceeds 20, the twisting effect by the fluid decreases, and it results in a reduction in crimpability of the yarn.
  • the especially preferred angle 6 is not more than 15".
  • the advantageous distance 1 is not more than 30 cm, preferably, not more than 30
  • the angle 6 is within the range of 0 to 20 for the same reasons as mentioned with respect to the angle 6
  • the Reynolds number of fluid at the torque twisting portion in the present invention can be very small. By applying a Reynolds number as small as 1,000 to 5,000, the intended yarn having controlled residual torque can be obtained.
  • T is the temperature of the first heatsetting(C)
  • T is the temperature of the second heatsetting(C)
  • De is the denier size of the yarn.
  • the upper limit of the Reynolds number is not affected by the temperature of the first heater, and is given as a function of the temperature of the second heater and the denier size of the yarn. With increasing heater temperature (T and decreasing denier sizes, non-torque bulky yarns can be obtained with smaller Reynolds number.
  • the lower limit of the Reynolds number is given as a function of the temperatures of the first and second heaters, and the denier size of the yarn. Non-torque bulky yarns are obtained with higher temperatures of the first heater, lower temperatures of the second heater, and smaller denier sizes of the yarns. These factors define the lower limit of the Reynolds number.
  • the temperature of the heater can be expressed by the surface temperature in the case of the contact-type heaters, and by the temperature of the gas phase part in the case of the non-contact type heaters.
  • temperature distribution sometimes occurs in the direction of the yarn travel in the heater according to some heating methods using the heaters. For example, in the case of heating with steam or heat-media, such temperature distribution relatively seldom occurs, and the temperature distribution is substantially uniform.
  • electrical heating considerable temperature distribution occurs, and
  • the temperature of the heater should be expressed by an area average temperature in the direction of the travel of the yarn. Generally, it can be simply expressed by the temperature of the central part of the heater.
  • the filament yarns used in the present invention are thermoplastic synthetic fibers.
  • polyester, polyamide, polyolefin, polyacrylonitrile, and acetate yarns are advantageously employed either alone or in combination.
  • the method of the present invention is especially advantageously applied to polyamide and polyester yarns, especially polyethylene terephthalate and poly-e-caproamide yarns, or mixtures of these yarns.
  • thermoplastic filament yarns used in the invention may be any filament yarn such as monofilaments or multifilaments although differing somewhat with denier size. Generally, the method of the invention is advantageously applied to multifilaments.
  • the denier size of the useful filament yarn is to 300 denier, preferably 50 to 200 denier, more preferably 70 to 150 denier.
  • the temperatures of the first and second heaters may be above the glass transition point up to the melting point of the yarn, preferably from about 160 C. up to the melting point. In the case of a polyethylene terephthalate yarn, temperatures in the range of 160 to 230 C. can be effectively employed.
  • the temperature of each heater can be chosen according to the desired bulkiness.
  • the effective heat-treating time at the heater differs depending upon the type, denier size and number of filaments of the thermoplastic synthetic filament yarn used and the performance of the heater and heating method. Generally, it is at least 0.2 second, preferably at least 0.3 second, especially preferably at least 0.4 second. There is no upper limit, but for economical reasons, the upper limit is usually set at about 3 seconds, preferably about 1.5 second, especially preferably about 1 second. Accordingly, the first and second heaters can be chosen so that they satisfy the effective heat-treating time requirements mentioned above.
  • each heater can therefore be one which meets such conditions. These conditions are applicable both to the first and second heaters.
  • the yarn is preferably cooled below the glass transition temperature of the yarn. Since the fluid nozzle mentioned above is used in the present invention, heat dissipation from the yarn achieved by the rotating fluid can be effectively facilitated, and therefore, a much larger cooling effect can be achieved than natural cooling.
  • the number of twists in the first step twisting is defined generally by the l-Ieberleins equation disclosed in British Pat. No. 890,992 or the Koechlins equation although differing according to the end use of the product yarn.
  • the twist coefficient is 0.5 to 1.10, preferably from 0.80 to 1.05.
  • the speed of the running yarn there is no particular limitation on the speed of the running yarn. Although different according to the type of the false-twister, processing conditions, and the yarn, the speed is usually 60 meters per minute or above. The upper limit is automatically set according to the above-mentioned conditions.
  • the direction of yarn travel is not particularly limited (e.g., the yarn can be travelled upwardly, downwardly, or even horizontally).
  • the residual torque is the number of twists of a yarn at a time when a load of 2 mg per denier is applied to the yarn and the yarn stops rotating.
  • the measured value is one per 25 cm, and the rotating force in the Z direction is positive.
  • the crimp shrinkage is measured as follows:
  • the length (I of a yarn is measured under a load of 202 mg/de, and then the yarn is treated with boiling water for 20 minutes under a load of 2 mg/de.
  • the yarn is spontaneously dried for one day and night in the absence of load, and then the length (1 is measured under a load of 202 mg/de. Then-under a load of 2 mg/de, the length (l of the yarn is measured.
  • the crimp shrinkage is expressed by the following equation.
  • Crimp shrinkage 1 l /l X If the yarn is a poly-e-caproamide yarn, the heavier load used is 102 mg/de instead of 202 mg/de.
  • EXAMPLES 1 TO 8 A l50-denier/30 filament semidull yarn of polyethylene-terephthalate was crimped at an overfeed rate of 4 percent, and a yarn speed of meters/min. in the productional process shown in FIG. 1. The number of false twists was 2670 (T/M), and the false-twisting direction Z.
  • the heater used was a curved surface contact type (heater length l m) was a heating temperature of the first heater being adjusted to 220 C. Then, the yarn was passed through the second heater and the center of the fluid nozzle at an overfeed rate of 17 percent.
  • the second heater is a pipe type having a circular vertical section in axial direction. The heating temperature of the second heater was 220 C., and the heater length was 50 cm.
  • the fluid nozzle used was of the type shown in FlG. 2 which rotated in the S direction. As the fluid, air was used, and the pneumatic pressure at the inlet 13 of the nozzle was adjusted as indicated in Table 1. The results are also
  • Example 1 Pneumatic Residual Crimp Examples Pressure(kg/cm G) torque Shrinkage EXAMPLE 9 AND COMPARATIVE EXAMPLES 1, 2 AND 3 The procedure of Example 1 was repeated except that the overfeed rate was 3 percent, the yarn speed was 105 meters/min, the number of twist of 2,500 (T/M), the temperature of the first heater was 210 C., the temperature of the second heater was 215 C., the second overfeed rate was 20 percent, and the pneumatic pressure was 0.12 kg/cm G.
  • the fluid nozzle was removed in the above Example, and the yarn was simply heat-set on the second heater (comparative Example 1); a hollow spindle was provided in place of the fluid nozzle 5, and also a contact heater was provided (the number of false twist 2040 (T/M), the false-twisting direction S, the temperature of the second heater 205 C., and the second overfeed rate 2 percent) (Comparative Example 2); and the overfeed rate was adjusted to 6 percent in Comparative Example 2 (comparative Example 3).
  • the properties of the treated yarns and their tension at the outlet of the second heater were compared as shown in Table 2 below.
  • Example 9 Residual Crimp Tension torque shrinkage (g/de) Remarks Example 9 4 15.4 0.020 Comp. Ex.1 35 16.3 0.017 Comp. Ex.2 8 7.2 0.080 Comp. Ex.3 Yarn breakage frequent; impossible to continue processing As is seen from Table 2, there is no substantial difference in crimp shrinkage between Example 9 and Comparative Example 1, but a drastic difference in residual torque is observed between them. in Example 9, a substantially nontorque yarn was obtained, whereas the yarn obtained in Comparative Example 2 has a large residual torque.
  • the bulky yarn according to the present invention has a markedly reduced residual torque as compared with the conventional method, and its bulkiness is almost the same as that of the conventional bulky yarns. Therefore, when the yarn of the present invention is used for knitting, snarls do not occur.
  • the knittability of the yarn obtained by the invention is very good, and the final knitted product obtained has great bulkiness.
  • Example 10 AND COMPARATIVE EXAMPLE 4
  • the procedure of Example 1 was repeated except that a polyethylene-terephthalate yarn (Semi Dull) of 50 denier and 24 filaments was used, the first overfeed rate was 5 percent, the yarn speed was 85 meters/min, the number of twists was 3900 (T/M), the false-twisting direction was Z (S), the temperature of the first heater was 220 C., the second overfeed rate was 15 percent, the temperature of the second heater was 180 C., and a fluid nozzle capable of rotating the yarn in the same direction as the false-twisting direction [the yarn rotating direction 2 (S)], and the pneumatic pressure was 0.4 kglcm G.
  • a polyethylene-terephthalate yarn Semi Dull
  • the first overfeed rate was 5 percent
  • the yarn speed was 85 meters/min
  • the number of twists was 3900 (T/M)
  • the false-twisting direction was Z (S)
  • the temperature of the first heater was 220
  • the bulky yarn obtained according to the present has a remarkably large residual torque and is best suited for application as de chin, etc.
  • Example 11 The procedure of Example 1 was repeated except that the temperature of the first heater was 205 C., the temperature of the second heater was 220 C., the pneumatic pressure was 0.10 kg/cm G, and the second overfeed rate was changed as shown in Table 4 below. The results are shown in Table 4.
  • the yarn obtained was knitted on a l8-gauge circular knitting machine, and then scoured and dyed.
  • the product had good surface condition and feeling and no dyeing unevenness was observed.
  • Example 9 The procedure of Example 19 was repeated except that a guide and a fluid nozzle were provided at the sec- 0nd heater so that they passed through the center of the heater.
  • the resulting yarn had a residual torque of 3.3 (f) and 35 (R). There was a marked deviation in residual torque among the spindles.
  • Example 19 The procedure of Example 19 was repeated except that a polyethylene-terephthalate yarn (semidull; 50 denier/24 filaments) was crimped at a first overfeed rate of 5 percent, and a yarn speed of meters/min. with the number of false-twists of 3,900 T/M in the S direction while the temperature of the first heater was being maintained at 220 C.; and subsequently, the crimped yarn was treated in the same way as in Example 19 at a second overfeed rate of 15 percent and a pneumatic pressure at the nozzle of 0.4 kg/cm G while the temperature of the second heater was being maintained at C. (yarn rotating direction S; the angle was changed as indicated in Table 8.
  • a polyethylene-terephthalate yarn (semidull; 50 denier/24 filaments) was crimped at a first overfeed rate of 5 percent, and a yarn speed of meters/min. with the number of false-twists of 3,900 T/M in the S direction while the temperature of the first heater was
  • the second heater a pipe heater provided with guides at its inlet and outlet such as shown in FIG. 7
  • the temperature of the second heater 215 C.
  • the angle 0 as shown in Table 10 The distance 1 4.0 cm between the center of the nozzle
  • the fluid nozzle provided at the position at which the angle is O.
  • Example 36 Comparative Residual Tension at the Examples [,(cm) 0() torqucLT) second heater Remarks (gr/dc) I5 08 S 12.3 0.024 Rotation of yarn 16 1.0 0 l .0 0.016 unstable 17 1.0 25 13.7 0.023 18 1.0 30 17.8 0.025 19 3.0 0 3.8 0.017 20 3.0 25 13.4 0.022 21 3.0 30 17.9 0.025 22 3.8 0 8.5 0.017 23 3.11 25 13.3 0.020 24 3.8 30 16.4 0.022
  • Example 27 The procedure of Example 27 was repeated except that the distance 1 was 3.0 cm, the angle 0 was 10, and the pneumatic pressure was changed as indicated in Table 12. The results obtained are shown in Table 12.
  • Example 0 C) Residual Tension at the torque (3) second heater (g /dc) COMPARATIVE EXAMPLES 27 AND 28 The procedure of Example 36 was repeated except that the angle 0 was changed as shown in Table 16. The results are shown in Table 16.
  • the diameter of the twisting path was 2.5 mm.
  • the fluid steam intersects the twisting path in a direction at right angles to the path and flows in a tangential direction with respect to the twisting path.
  • a fluid nozzle of the type shown in FIG. 2 was used, and by changing the air velocity, the Reynolds number in the twisting path of the fluid nozzle was changed as shown in Table 17.
  • Example 56 The procedure of Example 56 was repeated except that the temperature of the first heater was adjusted to 200 C., and the temperature of the second heater and the Reynolds number were changed as shown in Table 19. The Reynolds numbers were all within the scope of the present invention.
  • Example 56 The procedure of Example 56 was repeated except that the temperature of the second heater was adjusted to 205 C., and the Reynolds number and the second overfeed rate were changed as shown in Table 12. The Reynolds numbers were all within the scope of the present invention. The results are shown in Table 21.
  • Example 104 The procedure of Example 104 was repeated except that the Reynolds number was changed as shown in Table 27. The results are shown in Table 27. The Reynolds numbers were all outside the scope of the present invention.
  • Example 104 The procedure of Example 104 was repeated except that a 50 de/12 fil semi-dull filament yarn of polyepsiloncaproamide was processed under the following conditions:
  • Temperature of the first heater 160C. Temperature of the second 190C.
  • Second overfeed rate 16 Pneumatic pressure: 0.20 kg/cmG The results obtained are shown in Table 28.
  • a method of producing a bulky yarn having a controlled residual torque which comprises subjecting a thermoplastic synthetic filament yarn to a series of twisting, heat-setting on a first heater, and untwisting; feeding the yarn into a second heater while rotating said yarn by means of a fluid nozzle; and re-heat-setting said yarn in the second heater, said yarn being maintained in a substantially relaxed state during the rotation by said fluid nozzle and said re-heat-setting by said second heater.
  • angles of said yarn with respect to the inlet and outlet ends of said second heater are selected so that when the inlet contact point and outlet contact point of said yarn at said second heater are projected on a cross-sectional plane perpendicular to the axis of said heater, the two projected points are connected by an arc of a circle or an ellipse, and an angle formed by connecting said two projected points with the center of said circle or ellipse is at least and when said are is a part of the arc of the ellipse, said ellipse has a long axis to short axis ratio of not more than 20:1.
  • I is the distance between the point at which said yarn contacts the outlet of said second heater and the point at which the yarn passes to the center of said fluid nozzle inlet multiplied by cos 0,;
  • 0, is an angle formed by the line joining the point at which said yarn contacts the outlet of said second heater with the point at which the yarn passes to the center of inlet of the inlet of the twisting path and the axial line of said second heater at the outlet contact end;
  • 6 is an angle formed by the line joining the point at which the yarn leaves said fluid nozzle with the point at which the yarn is twist set and the axial line of said fluid nozzle at the outlet center thereof.
  • thermoplastic synthetic filament yarn has a denier of 15 to 300.
  • the filament yarn is a polyethylene-terephthalate yarn, poly-epsiloncaproamide yarn or a mixed yarn thereof.

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CH (2) CH559257A (enrdf_load_stackoverflow)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938314A (en) * 1974-05-10 1976-02-17 E. I. Du Pont De Nemours And Company False-twist texturing process with hollow friction twist tubes
WO1991003585A1 (en) * 1989-09-08 1991-03-21 Institute Of Textile Technology Method and apparatus for modifying spun textile yarn
US5263311A (en) * 1989-09-08 1993-11-23 Institute Of Textile Technology Method and apparatus for modifying spun textile yarn
US5351472A (en) * 1990-01-10 1994-10-04 Murata Kikai Kabushiki Kaisha Fluffing suppressing device
CN116024714A (zh) * 2023-02-17 2023-04-28 江苏德力化纤有限公司 一种无捻免浆涤纶经纱的制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3101925A1 (de) * 1980-01-26 1982-04-15 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid "blastexturiermaschine"

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US3041814A (en) * 1960-07-07 1962-07-03 Heberlein Patent Corp Apparatus for producing crimped yarn
US3137119A (en) * 1961-06-14 1964-06-16 Chavanoz Moulinage Retorderie Process for the production of high bulk yarns
US3309855A (en) * 1961-06-09 1967-03-21 Celanese Corp Process and apparatus for producing bulked plied yarn
US3543505A (en) * 1968-02-20 1970-12-01 Heberlein Patent Corp Process for relaxing internal tensions of textured synthetic yarns

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041814A (en) * 1960-07-07 1962-07-03 Heberlein Patent Corp Apparatus for producing crimped yarn
US3309855A (en) * 1961-06-09 1967-03-21 Celanese Corp Process and apparatus for producing bulked plied yarn
US3137119A (en) * 1961-06-14 1964-06-16 Chavanoz Moulinage Retorderie Process for the production of high bulk yarns
US3543505A (en) * 1968-02-20 1970-12-01 Heberlein Patent Corp Process for relaxing internal tensions of textured synthetic yarns

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938314A (en) * 1974-05-10 1976-02-17 E. I. Du Pont De Nemours And Company False-twist texturing process with hollow friction twist tubes
WO1991003585A1 (en) * 1989-09-08 1991-03-21 Institute Of Textile Technology Method and apparatus for modifying spun textile yarn
US5263311A (en) * 1989-09-08 1993-11-23 Institute Of Textile Technology Method and apparatus for modifying spun textile yarn
US5351472A (en) * 1990-01-10 1994-10-04 Murata Kikai Kabushiki Kaisha Fluffing suppressing device
CN116024714A (zh) * 2023-02-17 2023-04-28 江苏德力化纤有限公司 一种无捻免浆涤纶经纱的制备方法

Also Published As

Publication number Publication date
NL7117487A (enrdf_load_stackoverflow) 1972-06-21
DE2163226B2 (de) 1975-03-13
CH559257A (enrdf_load_stackoverflow) 1975-02-28
FR2118820A5 (enrdf_load_stackoverflow) 1972-07-28
GB1373778A (en) 1974-11-13
CH1856771A4 (enrdf_load_stackoverflow) 1974-07-31
DE2163226C3 (de) 1975-10-30
DE2163226A1 (de) 1972-08-10

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