JPS6235493B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a spun-like composite yarn, and more particularly to a spun-like composite yarn that swells and has a soft feel due to its slimy feel, as well as a moderate stiffness. Conventionally, as a method for manufacturing spunlike composite yarn, two or more types of yarns with different elongations are drawn, as described in JP-A-49-72443 and JP-A-49-47644. By aligning them and subjecting them to false twisting and crimp processing, it is possible to create a two-layer crimped yarn in which the yarns with lower elongation act as a core and the yarns with higher elongation surround it in the form of alternating yarns. Are known. In addition, as another method for manufacturing the double-layered yarn having the above-mentioned configuration, the wrapped yarn is overfed using the rotating torque of the core yarn in a twisted (false-twisted) state by a false-twisting spindle. It is also well known to wrap it around. (For example, see Japanese Patent Publication No. 45-28018.) In the double-layered yarns obtained by these methods, the twisted yarn is generally wound around the core yarn in an alternately twisted manner, so that the twisting effect is It is said to have a span-like texture.
In each twisted yarn area (S or Z winding section), there are usually at least three twists, and this produces the above-mentioned twisting effect. Incidentally, the pre-burned textured yarn having such a yarn structure had the advantage of improving the sliminess and fluffiness, which are the drawbacks of ordinary woolly textured yarn fabrics, due to its twisted yarn structure, but on the other hand, Because the wound yarn is wound in a tight bundle, the twisted yarn structure creates a rather hard texture and low bulk.
The texture was insufficient as a span-like texture. In addition, in this type of processed yarn, when the yarn is squeezed by a yarn guide etc. during the false twisting process or the weaving process, the wrapped yarn slips between the core yarn and neps occur, causing the yarn to become loose during the process. There were problems of increased breakage and deterioration of fabric quality. In order to create a composite yarn that eliminates such drawbacks, the present inventors previously proposed in Japanese Patent Application No. 54-5519, in which two yarns with different elongations were mixed and intertwined, and this was subjected to a stretch false twisting method. A two-layer structure yarn in which one of at least two kinds of filament yarns is used as a core yarn and the other filament yarn is wound around the processed yarn described below, that is, at least two types of filament yarns that have been subjected to a false twist crimp process. In,
Although some of the filaments constituting the winding yarn are randomly mixed and intertwined with the filaments in the core, the winding yarn as a whole is wound around the core yarn in a continuous reversal alternating twist pattern, resulting in an improved spun-like structure. We proposed a two-layer yarn with a similar appearance and texture. Unlike the conventional winding structure in which the core yarn is completely twisted, such a composite yarn has a reversal part in the alternately twisted yarn that exists continuously along the yarn axis direction, so it can be expanded appropriately. Moreover, due to intertwining points, that is, boundary entanglement between the core yarn and the winding yarn, there is no concern that the winding yarn will slip due to external force such as ironing, and is permanently stabilized. . However, subsequent detailed evaluation revealed that the fabric using the above-mentioned structural threads was unsatisfactory in terms of stiffness, and its functionality as a fabric was not yet perfect. The purpose of the present invention is to eliminate the drawbacks of the above structural yarns,
The purpose of the present invention is to provide a spun-like composite yarn that provides a fabric with superior elasticity and resilience. According to the present invention, one of the two or more types of filament yarns is used as a core yarn, and some filaments of the other yarn are mixed and intertwined with the core yarn, and the yarn is continuously inverted and alternately twisted into the core yarn. It is wound in a shape, and the mixture and
A spunlike composite yarn formed by fusing intersecting filaments is provided. However, the above-mentioned continuous reversal alternating twisted yarn type means that although the wound yarn is wound around the core yarn in an S and Z alternating twisted yarn form, at each winding part (S or Z part), the wound yarn is It does not have a helical winding structure in which the thread is completely wrapped around the core thread one or more times, but is reversed even when the thread is wound less than 360 degrees (so-called continuous reversal). Further, in this regard, the present invention has been made by paying attention to the manufacturing process of composite yarn proposed in the above-mentioned Japanese Patent Application No. 54-5519. That is, according to the above proposal, a yarn with higher elongation than the core yarn (for example, unextended yarn) is used as the winding yarn, but in this case, the filaments present in the core yarn (mixed and crossed with the core yarn) are During extended false twisting, the elongation rate is lower than that of the filament in the wrapped part, and from the point of view of ease of heat-sealing, (A) filament mixed and crossed with the core yarn > (B) wrapped part The order is filament > (C) core thread. Therefore, the filament (A) can be fused without requiring a high fusion temperature of 240° C. or higher, which is applied in the case of conventional extended threads. Therefore, if only the filament (A) is fused, stiffness will be imparted to the core yarn, and the filament (C), which is the original core yarn, will not actually undergo thermal deterioration (fusion). This provides repellency. The following will be explained with reference to the accompanying drawings. Figures 1 and 2 show typical examples of the composite yarn of the present invention.
The figure is a side view, and FIG. 2 is a sectional view. The most characteristic feature in FIG. 1 is that the wound yarn 2 has substantially no so-called helical winding portion where the wound yarn 2 is completely wound around the core yarn 1 one or more times. Instead, the wound yarn 2 as a whole is continuously and alternately reversed, and the portions in the S and Z twist directions are wound at an angle of less than 360° with respect to the core yarn. Moreover, as shown in FIG.
Since the threads are arbitrarily intertwined and fused with the core, even if the winding is incomplete due to continuous alternating reversals, there is a high level of connectivity, integrity, and improved stiffness between the core thread and the winding thread. It happens. The basic properties of such composite yarns are further emphasized by the yarn usage. For example, to improve the waist, the filament (single fiber) denier of the core yarn should be 2.0 de.
On the other hand, the deterioration in hand caused by this can be determined by changing the single fiber denier of the wound yarn, and furthermore, the ratio of the total denier of the wound yarn (D ₃ ) to the total denier of the core yarn (D ₄ ). By keeping it within a certain range, a more spun-like texture can be expressed. In other words, if the single fiber denier is 1.8 de or less (compared to, for example, 2.0 de)
It creates a soft texture that is impossible to imagine from the difference in deformation, and because the filament yarn is wound continuously in reverse, the winding yarn is alternately reversed and reversed at short pitches, that is, around the yarn axis. Since a state in which the directions are crossed is obtained, an appropriate twisting effect is maintained. Moreover, the winding state is looser than in the case of complete twisting, and since the winding yarn as a whole is reversed, the spun-like texture (bulge feeling and soft touch) is even more apparent. In order to obtain such an effect, it is important that the winding yarn sufficiently surrounds the core yarn, and for this purpose, a range of 0.5 to 1.5 is useful for D ₃ /D ₄ . . Moreover, although the winding itself appears to have an unstable structure at first glance, the filaments that make up the winding yarn and the core yarn are partially mixed and intertwined with each other, so the yarn as a whole is extremely stable (especially when ironed). It has the characteristic that it is (with respect to force). Such composite yarns are made by mixing and intertwining at least two types of filament yarns with different elongation differences, and then subjecting them to a special drawing false twisting method, whereby a part of the wrapped yarn in the core yarn is mixed and entangled. can be obtained by fusing filaments of In this case, it is necessary to first obtain a wound two-layer twisted yarn structure by intertwining two or more raw yarns with different elongations and then twisting them using a false twisting tool. For this purpose, it is necessary that all of the yarns with lower elongation can be sufficiently drawn and false-twisted, and at the same time, it is also necessary that the difference in elongation between the yarns to be combined with this yarn is 100% or more. Since the intertwined yarn is a mixture of two yarns with different elongations, it is difficult to form a two-layer structure even if the yarn is twisted as 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 twisting at the same time as drawing, yarns with different elongations that are integrated by the interlacing process can have a tension difference due to the difference in elongation characteristics of both yarns against the false-twisting tension. While the filaments are separated again into a filament group with high tension and a filament group with low tension, some of the fibers of both groups become yarns partially intertwined in the length direction, which are twisted by a false twisting device. From this point of view, it is necessary that the filament yarn with lower elongation can be drawn and false-twisted at least 1.2 times or more, but the most preferable results are obtained when the drawing ratio is 1.4 times or more. Furthermore, in order to obtain the wound two-layer twisted yarn structure at this time, the magnitude of the difference in elongation between the two yarns is relevant, and a difference in elongation that is larger than conventionally known is required. In other words, if there is no entanglement, a difference in elongation between the two yarns of about 50% is enough to create a two-layer structure, but when the yarn is entangled,
A difference in elongation of 100% or more is required, and more preferable results can be obtained if the difference in elongation is 150% or more. In this way, by providing a large elongation difference between the two yarns, the separation of the mixed fiber yarn into two layers due to drawing becomes apparent, and a two-layer twisted yarn structure is obtained for the first time in the twisted region. Then, by untwisting, a continuously reversed alternately wound structure is obtained. As mentioned above, the entanglement treatment of the raw yarn has a negative effect on forming a two-layer structure, but it can be improved by using yarn that can be drawn and false-twisted, and by combining yarns with a larger elongation difference. As a result, by synergistic use of the interlacing process, the elongation characteristics of the raw yarn, and the fusion of mixing and interlacing yarns within the core yarn, it is possible to obtain a continuously reversed alternately twisted yarn with stiffness. be. In the present invention, the more entanglements imparted to the yarn, the better. Generally, when an interlacing process is performed, the intertwined part and the spread part become a repeating unit to form an intertwined yarn. However, in order to carry out the present invention optimally, the length of the intertwined part is long and the length of the spread part is long. It is better to provide a confound with a short length. Moreover, it is ideal that the entanglement applied to the raw yarn be applied uniformly to the entire yarn;
pieces/m or more, preferably as shown in the examples below.
By setting the number to around 60 pieces/m, a processed yarn that can be said to be within the scope of the present invention can be obtained. In other words, even though the filaments constituting the wound yarn are individually separated, when looking at the overall tendency, a processed yarn with an SZ continuous alternating inversion winding structure is obtained, and when this processed yarn is made into a woven or knitted fabric, it becomes a moderately twisted yarn. It has a soft feel that is spun-like and full, while still having a soft texture. 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 non-entangled part opens to several times the thickness, while the entangled point does not open.
Visually read the number of intersecting points. As described above, the processed yarn of the present invention can be obtained, but there is no problem when processing it at a speed of 100 m/min or less using a normal twist pin type spindle false twisting machine, for example, but it is impossible to increase the speed and reduce the cost. 300 by adopting friction false twisting method to obtain processed yarn.
When processing at m/min or higher, special conditions are required during untwisting. If processed under normal false twisting conditions, the wound yarn will not wrap around the core yarn in an alternately twisted manner, but will be mixed and intertwined with the core yarn, but crimped filaments will be exposed on the surface of the yarn. The resulting processed yarn does not have a twisted yarn structure, and the woven or knitted fabric obtained therefrom is also insufficient as spun-like. One reason for this is the large centrifugal force that acts on the yarn during untwisting under high-speed processing. The second reason is that when a frictional false twisting device is used, there is a so-called slip between the threads that are normally twisted and the frictional twisting device, and as a result, when the yarn leaves the twisting device, the untwisting occurs. This is because, at the same time as the alternating twist winding structure is generated, the generated alternating twist winding structure is destroyed due to unfavorable friction caused by slipping with the instant twisting device. In order to solve this problem of yarn structure destruction, further studies revealed that the textured yarn of the present invention can be ideally produced by performing false twisting under special conditions. That is, one of the points is to reduce the centrifugal force that acts on the yarn at the untwisting point, which determines the structure of the resulting processed yarn. The idea is to make the radius smaller, or in other words, to make the ballooning amplitude minute. This can be done by reducing the ballooning by using a yarn guiding guide or the like, but the guide near the untwisting section installed in a general false twisting machine is not useful. Ballooning at high speeds becomes extremely large because the force is proportional to the square of the rotational angular velocity, and in order to stop the ballooning, extreme pressure must be applied to the untwisting point (the point where it leaves the twist pin or friction twisting device). It is necessary to get closer and provide a guide, etc. The second point relates specifically to the use of friction false twisting devices. In other words, when using a friction false twisting device, a twisting device is used to twist and untwist the yarn, and at the same time, a feeding force is applied to the yarn so that an unreasonable external force does not act on the yarn at the untwisting point. The purpose is to increase the feeding action to a condition that cannot be used in normal frictional false twisting due to problems such as unresolved combustion and increased yarn breakage. Expressing this in terms of K value, even though the yarn is false-twisted while being drawn, when 0.5<K value<0.9, an ideal continuous alternately wound yarn can be obtained. For example, when the machining speed is 500m/min, the K value is
When the K value is 1.1, the twisted structure becomes weak, and when the K value exceeds 1.3, the twisted structure is no longer recognized. Here, the K value is T ₁ (false twisting tension: g) and
It is expressed as the ratio T ₂ /T ₁ with T ₂ (false twisting tension: g). It is most preferable that the continuous reversal alternating twist yarn structure consists of complete reversal alternating twists, but even if the same direction continuous twisting is present up to about 20% of the total yarn length, For practical purposes, woven and knitted fabrics are maintained at a sufficiently high level of quality. Furthermore, even if there are 2 to 3 defective winding parts per meter of length of about 3 cm, the quality is maintained at a high level. One embodiment for obtaining the spunlike composite yarn of the present invention will be explained with reference to FIG. Mixed fibers pass through roller 8.
Air is supplied to the interlacing air injection nozzle 9, where 30
It is considered to be an interlaced yarn having more than K/M interlacing points. Next, this intertwined yarn is transferred to the first delivery roller 10
heater 11,
After passing through the false twisting tool 12, the second delivery roller 13
After being picked up by the operator, it is wound up as a tube 14. In the above process, a heater temperature of approximately 185° C. to 225° C. may be used to selectively fuse some of the filaments (of the wound yarn) that are mixed and crossed with the core yarn. At such temperatures, the core yarn is drawn and has physical properties substantially close to those of the drawn yarn, so that the core yarn is not fused and the mixed/intersected filaments are selectively fused. In addition, the wound filament is wound with a yarn length difference of several tens of percent between itself and the core yarn (meaning that it is stretched by that amount), and only the mixed/intersected filament (A) can be used. The temperature for fusing may be selected from the above range of 185°C to 225°C. In the present invention, "filament yarn" mainly refers to polyethylene terephthalate, but 15
It is also possible to copolymerize the third component in a proportion of mol % or less. The polyester may also contain additives such as matting agents, colorants, flame retardants, and the like. 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 colorant, etc., at least any of these may be different. 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 material may be wound up once after the interlacing treatment, or may be false-twisted without being wound up. Preferably, the false twisting device is a circumferential friction false twisting device that can both false twist the yarn and send it out at the same time. As described above, according to the present invention, it is possible to provide a spun-like woven or knitted fabric that is stiff and has an appropriate twist texture, fullness, and improved flexibility. Further, even during weaving, neps are not generated by the force of the composite yarn of the present invention, such as by stepping, improving weavability and providing high-quality woven or knitted fabrics. Example 1 Various polyester filaments with a total denier of 225 de and different numbers of filaments, that is, filament denier (d ₂ ) were obtained depending on the spinning speed at which an elongation of 120% was obtained. Elongation obtained by spinning
345% polyester filament yarn (225de/
72fils) were aligned and subjected to intertwining treatment and stretching false twisting in the process shown in Figure 3. Using an interlace nozzle, 60 entanglements/m were applied at an overfeed rate of 2.5% and a compressed air pressure of 3.5 Kg/ ^cm2 , followed by a stretching ratio of 1.56 times and a heater temperature.
Stretching and false-twisting were performed at 200° C. under the conditions of a friction false-twisting device surface speed of 700 m/min, a second de-delivery roller speed of 350 m/min, and a K value (untwisting tension/twisting tension) of 0.75. The obtained processed yarn was a continuously alternately twisted thread-like yarn as shown in FIGS. 1 and 2. The actual draw ratio of the wound yarn is 1.56 times due to the draw false twisting and the average yarn length difference of 35% between the draw ratio and the core yarn generated due to the false twist.
It was 2.1 times as hot. Further, even when this processed yarn was squeezed, no neps occurred, and there were no weaving problems. Furthermore, Table 1 shows the evaluation results of a sensory test regarding the stiffness and feel of fabrics using these composite yarns.

[Table] No. 1 to 3 have a core yarn single fiber denier of 2de.
Because it is smaller, it lacks some stiffness, and No. 5 is processed at a heater temperature of 180°C, so there is no fusion in the core, so it lacks some stiffness. No. 4, No. 6 to 8 have a single fiber denier of core yarn of 2 de.
The effect was more pronounced as the waist was more than sufficient and the single fiber denier was thicker. In addition, in each case, the single fiber denier of the wrapped thread was as thin as 1.5 de, and the yarn had a soft, slimy touch with a wool-like feel. Example 2 225de/48fils by spinning at a speed of 3200m/min
(elongation of 115%), polyester filament yarns with different numbers of filaments, that is, single fiber fineness (d ₁ ), were obtained at a spinning speed that yielded undrawn yarn with an elongation of approximately 300%, Both yarns were aligned and subjected to intertwining treatment and drawing pre-combustion processing in the steps shown in FIG. Using an interlace nozzle, 65 entanglements/m were applied at an overfeed rate of 1.5% and a compressed air pressure of 4 Kg/ ^cm2 , followed by a stretching ratio of 1.56 times and a heater temperature.
Stretching and false-twisting were performed at 210° C. under the conditions of a friction false-twisting device surface speed of 700 m/min, a second delivery roller speed of 350 m/min, and a K value (untwisting tension/twisting tension) of 0.8. The obtained processed yarn was a continuously alternately twisted thread-like yarn as shown in FIGS. 1 and 2. The actual stretching ratio of the wound yarn was 2.1 times as a result of the stretching ratio of 1.56 times due to extended false twisting and the average yarn length difference of 35% between the core yarn and the core yarn generated by false twisting. Furthermore, Table 2 shows the evaluation results of a sensory test regarding the stiffness and feel of fabrics using these composite yarns.

[Table] Nos. 9 to 13 had a single fiber denier of the wound yarn of 1.8 de or less, and had a soft, slimy, wool-like feel. However, for No. 14 to 15, the single fiber denier of the winding yarn is
With a diameter of 2.0 de or more, the surface touch felt rough, and No. 15 in particular was unsuitable for use as clothing. In addition, No. 12 was processed at a heater temperature of 180°C, and as there was no fusion in the core, it lacked some stiffness. Example 3 Various polyester filaments with different total denier (D ₂ ) and single fiber denier (d ₂ ) were obtained depending on the spinning speed at which an elongation of 120% was obtained.
Each filament yarn was aligned with a polyester filament yarn (225 de/72 fils) with an elongation of 345% obtained by spinning at a speed of 1380 m/min, and a third
In the process shown in the figure, entangling treatment and stretching false twisting were performed under the same conditions as in Example 1. The obtained processed yarn was a continuously alternately twisted thread-like yarn as shown in FIGS. 1 and 2. Furthermore, the difference in yarn length caused by false twisting was 35% on average, and the actual stretching ratio of the wound yarn was 2.1 times on average. Furthermore, Table 3 shows the sensory evaluation of the stiffness and feel of the fabrics using these composite yarns.

[Table] For Nos. 16 to 17, the denier ratio D ₃ / D ₄ is smaller than 0.5, so the winding yarn cannot completely cover the core yarn, and the thick single fiber denier of the core yarn appears on the surface and is soft. It lacked texture and sliminess. Nos. 18 to 20 and No. 22 had D ₃ /D ₄ in the range of 0.5 to 1.5, had firmness, and had a soft and slimy surface texture, similar to spun. However, No.
21 was processed at a heater temperature of 180°C, so there was no fusion in the core, and it lacked some stiffness. Nos. 23 and 24 had a D ₃ /D ₄ of more than 1.5 and had a low ratio of total denier of the core yarn, so they lacked stiffness.

[Brief explanation of the drawing]

FIG. 1 is an enlarged side view showing the yarn structure of the processed yarn of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a schematic diagram showing one aspect of the process for manufacturing the processed yarn of the present invention. 1: Core yarn, 2: Wound yarn, 3: Filament constituting the wound yarn, 3': Fusion filament, 4,
5: Yarn, 6: Guide, 7: Tension device, 8: Feed roller, 9: Interlace nozzle, 10:
1st delivery roller, 11: heater, 12: false twister, 13: second delivery roller, 14: rolled cheese.

Claims (1)

[Scope of Claims] 1. One of the two or more types of filament yarns is used as a core yarn, and some filaments of the other yarn are mixed and intertwined with the core yarn and are continuously and alternately reversed to the core yarn. A spun-like composite yarn that is wound into a twisted yarn shape and is formed by fusing mixed and crossed filaments in the core yarn. However, the above-mentioned continuous reversal alternating twisted yarn type means that although the wound yarn is wound around the core yarn in an S and Z alternating twisted yarn form, at each winding part (S or Z part), the wound yarn is It does not have a helical winding structure in which the thread is completely wrapped around the core thread one or more times, but is reversed even when the thread is wound less than 360 degrees (so-called continuous reversal). 2. The single fiber denier of the winding yarn is 1.8 or less.
Composite yarn according to claim 1. 3. The spunlike composite yarn according to claim 1, wherein the core yarn has a single fiber denier of 2.0 or more. 4. The spunlike composite yarn according to claim 1, wherein the total denier (D ₄ ) of the core yarn and the total denier (D ₃ ) of the wrapped yarn satisfy 0.5≦D ₃ /D ₄ ≦1.5.