JPS6020489B2 - Manufacturing method of spunlike processed yarn - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an improved method for producing spunlike textured yarn, and more particularly to an improved method for producing a two-layer structured yarn in which wrapped yarns are alternately twisted around a core yarn. Conventionally, alternately twisted two-layer structured yarns using false twisting have been manufactured by the method described below. Generally, when two or more types of yarns with different elongations are supplied to the supply roller in a lined state and burned using a false twisting spindle, the yarns with lower elongations are difficult to stretch, so they form the core of the yarn. ,
Since yarns with high elongation are easy to stretch, they are twisted so as to surround the outer layer of the yarn. When this twisted yarn state is heat-set and then untwisted, a two-layer weft crimped yarn is obtained in which the threads with low elongation act as a core and the threads with high elongation surround the core in an alternately twisted manner. It will be done. (Refer to JP-A-49-72-443 and JP-A-49-47-644) On the other hand, as another method for producing a double-layered yarn having the above-mentioned form, the yarn is twisted into a twisted (false-twisted) state using a false-twisting spindle. It is also well known to use the rotational torque of a certain core yarn to overfeed the winding yarn while winding it. (For example, see Japanese Patent Publication No. 45-28018.) In the two-layered yarns obtained by these methods, the wound yarn is generally wound around the core yarn in the form of an alternating yarn, so that due to its twisted yarn structure, This improves the sliminess and fluffiness that are the shortcomings of ordinary woolly processed yarn fabrics, but on the other hand, during the manufacturing process, the yarn is wrapped around the core yarn under high tension during false twisting, causing the yarn to wrap around the core yarn, which is under high tension during false twisting. Because it is coated, the core yarn cannot shrink due to winding even after processing. Therefore, fabrics made of processed yarns lack elasticity and may cause a feeling of pressure at the elbows and knees when made into clothes. Improvements have been desired, especially in sports clothing. This sports clothing requires a fabric that can expand and contract freely during exercise, and currently, to compensate for the drawbacks of double-layer wound yarn, it is commonly woven with stretchable woolly yarn. . However, in that case, another problem arises in that the spun-like texture is reduced by half. The purpose of the present invention is to
The object of the present invention is to provide a method for producing a stretchable two-layer spun-like textured yarn by improving the drawbacks of the conventional alternately twisted two-layer structure yarn production method. In order to achieve this objective, the present inventors believe that it is necessary for the core yarn to have elasticity even when the core yarn is oriented vertically by the two-layer weft wound yarn, and has conducted various studies. As a result, it was discovered that remarkable effects can be obtained when polybutylene terephthalate yarn is used as the core yarn. That is, the present invention provides a polybutylene terephthalate filament yarn (1) whose main drying units are composed of butylene terephthalate units and which can be stretched to 1.1 times or more, and a polyester filament yarn leg whose elongation is 80% or more higher than that of the filament yarn (2). and the following conditions [1] and

Spun-like processing is characterized by subjecting to simultaneous stretching temporary lacquer processing at a stretching ratio of 65% to 80% of the cutting elongation of filament yarn in a state where they are interwoven and intertwined with each other so as to satisfy [0] at the same time. This is a method of manufacturing thread. Conditions [1]...The total denier of the yarn before blending and interlacing is 50 to 3.
0 e(ii) Tear weave/total denier of 'B' yarn before interlacing is 50 to 30Me plate Denier ratio of wind yarn and Tsukuda yarn [
Condition/■] is 0.7 or more [B] (i) The single fiber denier of the wind after stretching and false-twisting is 0.7 or more (ii) ' after stretching and false-twisting
The present invention will be explained in more detail with reference to the accompanying drawings, in which the single fiber denier of B' is less than or equal to (iii) the single fiber denier of {B} is the same as or greater than the single fiber denier of {B}. FIG. 1 shows one embodiment of the present invention. A filament yarn 1 in which the main repeating unit is composed of polybutylene terephthalate.
The polyethylene terephthalate filament yarn 2, which has a higher elongation, is combined in a guide 3, passed through a tension adjustment device 4, and a feed roller 5, and then supplied to an air injection nozzle 6 for intertwining and entangling, where 30 yarns per yarn are combined. It is considered as an interlaced yarn having m or more interlacing points. Next, this intertwined yarn is supplied to the drawing false twisting zone by the first delivery roller 7, passes through the heater 8 and the false twisting tool 9, and is taken off from the river by the second delivery roller 1.
It is rolled up as cheese 11. In this way, a two-layer structure yarn is obtained in which polybutylene terephthalate yarn is arranged as a core yarn and polyethylene terephthalate yarn is arranged as a winding yarn. What is important here is the interlacing treatment before and after the false twisting process, and if this is lacking, the processed yarn with polybutylene terephthalate filament yarn as the core yarn will be repeatedly stretched and contracted due to the elasticity of the polybutylene terephthalate yarn. Because of this, the core yarn and the alternately twisted yarn may separate, causing a practical problem, so it is necessary to intertwine the core yarn and the alternately twisted yarn to stabilize the yarn structure. . This entanglement may be applied before the false combustion process or after the false twisting process, but a much more stable structure can be obtained if it is applied before the false twisting process. The more entanglements imparted to the raw yarn, the better; generally, when an interlacing treatment is applied, the interlaced portion and the open weave portion form a repeating unit to form an interlaced yarn; however, in order to optimally implement the present invention, It is preferable to provide entanglement such that the length of the entangled portion is long and the length of the spread portion is short. In this way, two or more types of raw yarns with different elongations are intertwined and then burned in a temporary burner, and in order to obtain a wound two-layer yarn structure, the yarn with the lower elongation is stretched. It is necessary to be able to false twist, and at the same time, it is also necessary to have a difference in the elongation of the threads to be combined. Since the interlaced yarn is a mixture of two yarns with different elongation, it is difficult to form a two-layer structure even if it is pre-combusted as it is. However, this problem can be solved by supplying a yarn that can be drawn and false-twisted to the yarn with lower elongation. In other words, by false-twisting and burning at the same time as drawing, yarns with different elongations that have been integrated into a mixed weave through the interlacing process can have a high tension due to the difference in elongation characteristics of both yarns with respect to the false-twisting tension. While being separated again into a filament group and a filament group with low tension, some of the fibers of both groups become yarns partially intertwined in the length direction, which is twisted by a false twisting device. From this point of view, it is a necessary condition that the filament yarn with lower elongation can be drawn and pre-combusted at least 1.1 times or more, but when the drawing ratio is 1.4 times or more,
The most favorable results are obtained. Furthermore, at this time, in order to obtain a wound two-layer twisted yarn structure, the magnitude of the difference in elongation between the two yarns is relevant, and a larger difference in elongation than conventional wisdom is required.
That is, in the case of no entanglement, a difference in elongation between the two yarns of about 50% is enough to form a two-layer structure, but in the case of interlacing treatment, a difference in elongation of 80% or more is required. In particular, more favorable results can be obtained if there is a difference in elongation of 150% or more. In this way, by providing a large elongation difference between the two yarns, the separation of the mixed warp yarn into two layers due to drawing becomes apparent, and a two-layer twisted yarn structure is obtained for the first time in the heating region. As a result, by untwisting the twisted yarn, a two-layer structured yarn with alternately twisted and wound layers is obtained. Ideally, the entanglement imparted to the raw yarn should be uniformly imparted to the entire yarn, but from a practical point of view, the number of entanglements should be 3 strands/plane or more, preferably 49 strands/plane or more. Processed yarn that can be said to be the scope of the present invention is obtained. Note that the degree of entanglement is measured as follows. In other words, when the entangled raw yarn is floated in water in a container, the unentangled part becomes several times thicker, and the entangled points do not open. Read numbers visually. The polybutylene terephthalate source yarn used for the core yarn preferably has a high elongation at break of 60% or more, and is preferably 0.65 to 0.8 times the elongation at break, more preferably 0.67 to 0. Desired elasticity can be obtained when stretching and pre-combusting at 73 times. If it is less than 0.6, the textured yarn will stretch easily, but its recovery properties will be poor, and if it exceeds 0.8, the strength of the textured yarn will decrease and its elongation will be insufficient. On the other hand, polyethylene terephthalate, polybutylene terephthalate, etc. are suitable for the yarn used as the winding yarn, and the raw yarn elongation must have enough margin to sufficiently absorb the elasticity of the processed yarn and deform, and at least 80% higher than the core yarn. % or more is required, and if there is a difference in elongation of 150% or more, more favorable results can be obtained. The core yarn and wound yarn are made of polybutylene terephthalate and
The main target is polyethylene terephthalate, but 15
A copolymer with the third component in a proportion of less than mol% may also be used. The yarn may also contain additives such as matting agents, coloring agents, and retardant agents. Further, although the undrawn yarn and the partially oriented yarn may have the same filament cross-sectional shape, content of matting agent, presence or absence of coloring agent, etc., at least any of these may be different. In this case, the denier of undrawn yarn and partially oriented yarn should be selected depending on the application.
Generally, in total denier, winding thread denier/core thread denier ZO. It is best to set it to 7, and the former is 50 to 30.
The latter is also preferably 50 to 30 Me. In addition, considering the draw ratio during processing, the single fiber warp denier should be a combination where the single fiber denier after processing is the wound yarn ≧ the core yarn, and the single fiber denier of the wound yarn after processing is less than or equal to mottled e, The total single fiber denier of the core yarn is particularly preferably Beni e or higher. By combining the yarns as described above, it is possible to obtain a woven or knitted fabric that has bulkiness, a soft feel on the surface, elasticity and resilience, and has sufficient elasticity. Further, as the air injection nozzle, a generally used nozzle for interlace processing is suitable, and a Taslan nozzle can also be applied. Further, the film may be wound up once after the interlacing process, or it may be temporarily burned without being wound up. Preferably, the false twisting device is an external friction type false twisting device that can temporarily burn the yarn and send it out at the same time. Furthermore, the stretchability of the processed yarn was evaluated as follows. A yarn length of 20 mm was used as the test length, an initial load of 20 mm was applied to the yarn, and then it was stretched at a rate of 100%/min to a stress generation elongation of 250 mm as shown in Figure 2, and then as instantaneously as possible. In order to see the recovery, recovery was performed at a rate of 300%/min. The elongation A (%) and recovery B (%) at that time were read from the diagram, and the ease of elongation was evaluated as A%, and the ease of recovery was evaluated as B/A. Example 1 A polybutylene terephthalate filament yarn (22 mother e/3 i
ls, elongation 120%) and polyethylene terephthalate filament yarn (22&e/72ils, elongation 350%) obtained by spinning at a speed of 1300 m/min, and using the process shown in Figure 1, guide 3. After doubling, the yarn is fed through a tension adjustment device 4 and a feed roller 5 to an air injection nozzle 6 for interweaving and interweaving, and the overfeed ratio is 2.5%, and the air pressure is 5k9/mede7 for a total interweaving of hard/mek. , and then the stretching ratio was 1.55 and the temperature of the heater 8 was 1.
70°C, surface speed of friction false twisting device 9 700/min,
The cheese 11 was stretched and false-twisted under the conditions of the second delivery roller 10 at a speed of 350 m/min and a K value (unlacquer tension/twisting tension) of 0.85. The processed yarn thus obtained had a two-layer structure (29We) in which polybutylene terephthalate yarn was arranged as a core yarn and polyethylene terephthalate yarn was arranged as a winding yarn. When the elasticity was evaluated by the method shown in FIG. 2, the ease of stretching A (%) = 8.3 and the ease of recovery B/A = 0.76. Comparative Example 1 As a comparative example, a polyethylene terephthalate filament yarn (22 mother e/3 female ls) with an elongation of 115% obtained by spinning at a speed of 3500/min and an elongation of 360 obtained by spinning at a speed of 1200 min/min were used. % polyethylene terephthalate filament yarn (22 matrix e/72i
ls) were aligned and subjected to interlacing treatment and stretch false twisting in the process shown in FIG. 1 under exactly the same conditions as in the example. The obtained processed yarn was the same double layer structure yarn (29We
) In this case, the filament yarn with low elongation was the core yarn and the filament yarn with high elongation was the wound yarn. The elasticity was evaluated in the same manner as in Example 1, and the results were as follows: Ease of stretching A (%) = 4.6% Ease of recovery B/A = 0.42. Comparative Example 2 Polybutylene terephthalate (hereinafter referred to as PBT) with an intrinsic viscosity of 0.85 and polyethylene terephthalate (hereinafter referred to as TPET) with an intrinsic viscosity of 0.65 were yarned at different thread speeds (PBT was 24 fils, PET is 4
Yarns of various elongations were obtained, combined as shown in Table 1, interlaced under the conditions shown in Table 1, and then stretched and false-twisted at a speed of 350 m/min and a heater temperature of 170 qo. . Regarding the obtained processed yarn, the formation of a two-layer structure (determined by microscopic observation), the stability of the two-layer structure (a ceramic guide with a diameter of 2 skins, a bending angle of 120o, a tension of 0.3 degrees/de, and a thread distance of 100 degrees) /mm and determine whether the wound yarn slips or not), stretchability (evaluated by the method shown in Figure 2 above), strength and elongation (measured by the usual method)
was measured. The results were as shown in Table 2. Table 1 Table 2 As mentioned above, according to the present invention, a suitable yarn texture,
Provided is an improved method for producing an alternately twisted two-layer spunwriter textured yarn that provides a spunlike woven or knitted fabric that has fullness, flexibility, and sufficient stretchability. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing one embodiment of the apparatus for producing processed yarn of the present invention, and FIG. 2 is a diagram for explaining elasticity evaluation of processed yarn. 1, 2: Yarn, 3: Guide, 4: Tension device, 5: Feed roller, 6: Interlace nozzle, 7: First delivery roller, 8: Heater, 9: False twist odor, 10: Second delivery roller, 11: Winding Tori cheese. No spear ′ Zu spear Z diagram

Claims (1)

[Scope of Claims] 1. A polybutylene terephthalate filament yarn (A) whose main repeating units are composed of butylene terephthalate units and which can be stretched to 1.1 times or more, and whose elongation is 80% or more greater than that of the filament yarn (A). The polyester filament yarn (B) is mixed and entangled with each other so that the following conditions [I] and [II] are satisfied at the same time, and the cutting elongation of the filament yarn (A) is 65% to 80%. A method for producing spunlike textured yarn, characterized by subjecting it to simultaneous stretching and false twisting at a stretching ratio of . Conditions [I] (i) The total denier of (A) yarn before blending and interlacing is 50 to 300 de. (ii) The total denier of (B) yarn before blending and entanglement is 50 to 300 de. (iii) (A) The denier ratio [(B)/(A)] of the yarn and (B) yarn is 0.7
The above conditions [II] (i) The single fiber denier of (A) after stretching and false twisting is 3 de
(ii) Single fiber denier of (B) after stretching and false twisting is 3
(iii) The single fiber denier of (A) is the same as or greater than the single fiber denier of (B).