JPS6240452B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a false-twisted composite yarn by false-twist winding and an improvement in its manufacturing method. Using false twisting, the false-twisted yarn is fed under the overfeed and is fed while winding other yarns, creating a worsted-like texture in which the twisted yarn is wrapped around the surface of the core yarn. The method for making the two-layered yarn shown is already well known, such as in Japanese Patent Publication No. 45-28018. However, a common problem with this type of yarn is that during use, the bond between the core yarn and the wrapped yarn is not strong and tends to shift easily, resulting in a disadvantage that the quality of the yarn is significantly reduced. In addition, in terms of the texture of wrapped yarn, there has been a trend in recent years to favor the simple, natural taste of cotton. However, the texture and touch are so different from those of synthetic fibers that there is no way to compare them, so it is currently impossible to approximate these characteristics using synthetic fibers. In the process of investigating various false twisted composite yarns similar to spun cotton yarn using synthetic fibers, the present inventors fused essentially only the core of a core yarn type false twisted yarn. On the other hand, I learned that when single fibers of approximately 2 de or less are used as sheath yarns, and when some of these single fibers are bundled by interfacial fusion with the core yarn, there are signs that a cotton-like texture appears. In this application, we proposed the following cotton-like composite yarn. A false twisted composite yarn consisting of a sheath yarn made of multifilament yarn wrapped around a core yarn, in which a part of the filament yarns constituting the sheath yarn are continuously and alternately inverted around the core yarn in a substantially bundled state. It is characterized in that it is wound in a twisted manner, and the winding interface is at least partially fixed by fusing the core yarn, while the remaining filament yarns are individually separated and wound in a crimped state. A composite three-layer yarn with a cotton-like texture. 1st
Figures 1 and 2 are a side view and a sectional view, respectively, of the above-mentioned composite three-layer structure yarn, in which the core yarn 1 is fused and has no elasticity, and a part of the sheath yarn 2 is a fused core yarn. The sheath yarn is at least partially fixed at the interface with the core yarn, and is continuously wound in the S and Z directions at a winding angle of 360° or less, with the winding direction reversed, and the remaining sheath yarn is The filament yarns 3 have a unique structure in that they are individually separated and wound in a crimped state. On the other hand, FIG. 3 is a side view of a spun cotton yarn. The yarn has no elasticity, and the core 4 is twisted, so the fibers are tightly bundled and stiff. On the other hand, the surface portion is covered with countless thin filament fluffs 5, giving it a soft feel. Here, the fused core yarn 1 and part 2 of the sheath yarn of the processed yarn in FIGS. 1 and 2 can be compared to the bundled core part 4 of cotton yarn, and the crimped single fiber 3 can be compared to the surface fuzz 5 of cotton yarn. . However, it was subsequently confirmed that the number of stops of the loom increases noticeably in the fiber manufacturing process using the above-mentioned three-layer structured yarn as the warp yarn. As a result of investigating the cause of this, it was found that in the outermost layer of the structural yarn, the filaments 3 are individually loosely wound around each other, and when these become adjacent to each other as warp yarns on the loom, entanglement occurs between the yarns. In turn, it was found that it was inducing suture breakage. Therefore, an object of the present invention is to provide a false-twisted composite yarn which does not have the above-mentioned drawbacks and has significantly improved workability. Another object of the present invention is to provide a false-twisted composite yarn that uses synthetic fibers and exhibits a natural taste similar to spun cotton yarn. According to the present invention, (1) in a composite false twisted yarn in which a sheath yarn made of a multifilament yarn is wound around a core yarn, some of the constituent filaments in the multifilament yarn are wound around the core yarn in an alternately twisted yarn shape; (first winding), and the remaining filament is further wound in the opposite direction to the winding direction of the alternating twist portion (second winding), thus the filament is wrapped around the core yarn within the same sheath thread. A false-twisted composite yarn characterized in that it includes a laminated wound portion in which the yarns are wound in a crossed manner, and (2) a synthetic fiber yarn-like yarn (core yarn) that is being drawn and false-twisted.
On the other hand, upstream of the false twisting tool, other yarns (sheath yarns) are wound and fed under the overfeed using the rotational torque of the yarn to form a wound structured yarn, and the false twisting tool There is provided a method for producing a false-twisted composite yarn, which is characterized in that the wound structure yarn is immediately untwisted while causing ballooning of only one pile. Furthermore, regarding this, in the composite yarn according to the present invention, the filaments within the same sheath yarn have a laminated winding structure in a crossed state, and the outermost layer filament (sheath yarn) is also in a tightly wound state. At first glance, this structure tends to be perceived as having a hard feel, but since the individual filaments within the sheath yarn are wound in a stacked manner in a crossed manner, the gaps between the filaments are extremely large, and it has a soft touch similar to the structural yarn of the previous application. exhibits. In addition, the key points of the method for producing the composite yarn, which is the second invention, are (a) the processing method adopts a simultaneous stretching and false twisting method, (b) the sheath yarn is wound in this process, and (h) )
Furthermore, the synergistic effect of the requirement to form a balloon with only one peak immediately after the untwisting point led to the creation of a new structural yarn, and the reason for this will be explained in detail later. FIG. 4 is a model (side) view of a false twisted composite yarn according to the present invention, in which 1 is a core yarn, 2' is a group of filaments of a part of the sheath yarn 8, which are wound around the core yarn 1 in an alternately twisted manner;
A first winding portion is formed. Further, the remaining filament group 3' of the sheath yarn is wound in the opposite direction to the first winding direction, that is, intersecting with the first winding filament group, to form a second winding portion. ing. Moreover, what is noteworthy here is that both the 2' and 3' filament groups are originally separated during processing within the single yarn of the multifilament and have a laminated and wound structure. Moreover, unlike the filament group of the previous application, the filament group 3' does not cover the yarn surface in a crimped state, but has a stable winding structure, so when arranged as warp yarns, There is no concern about threads hitting each other, and there is no possibility of adjacent thread breakage. Figure 5 is a microscopic photograph of the laminated winding part (X56)
It is confirmed that the first winding part and the second winding part intersect and form a laminated winding within the sheath thread. Further, additional features of the false twisted composite yarn of the present invention will be explained with reference to the steps shown in FIG. 6. The figure shows an example of the false twist winding process of the present invention, in which the core yarn 1 is fed from the first feed roller 6, and is subjected to rotational force by the false twister 7 to be in a false twist state. On the other hand, the winding yarn 8 is fed through a second feed roller 9 and a guide 10 so as to be wound around the false-twisted core yarn 1' by its rotational force. In this state, the yarn is heat-set by a heater 11, passed through a false twister 7, a guide 12, and a draw roller 13, and then wound around a winder 14 to obtain a composite textured yarn in which a core yarn is wrapped around a core yarn. What is important here is that the core yarn 1 is made of highly elongated synthetic fiber yarn that can be drawn, and this is stretched between the first feed roller 6 and the draw roller 13 while being false-twisted. It is in a processed state, and a winding thread is wound around it. By doing so, the wrapped state is stretched as the yarn progresses (due to stretching and false twisting), so the migration between the filaments between the wound yarns becomes noticeable, and the filaments located at the outer periphery are in the wrapped state (the first 1
(wrapped). An important point in the process of the present invention is to wind this loose filament more tightly, and this is done by imparting ballooning to the wound yarn of only one thread between the false twisting device and the guide 12. This is achieved by This can be compared to skipping a rope. The thread is held by the false twister 7 and the guide 12, and the filament, which is in a free state at this time, is rotated once by a balloon with only one thread between them. It is tightly wound in a different phase from the winding. It has been found that ballooning with only one ridge is important in forming the second wrapped portion, and even if the ballooning is less than one ridge or exceeds one ridge, a second firm wrapping will not be formed. When setting up this single balloon balloon,
First, perform temporary processing without installing the guide 12 under the set processing conditions at that time, check the first ballooning knot that occurs immediately after the false twister 7, and then attach the guide 12 to the knot and restart the processing. Bye. Typically, the minimum ballooning amplitude is 3 mm, and the wavelength is in the range of 5 to 15 mm. A characteristic of the false twisted composite yarn formed in this process is that the filaments 2' and 3' migrate to each other between the first winding part and the second winding part, and at first glance, there is a phase separation. However, the two have a solid interconnected structure. This is because the filaments that come loose during the above-mentioned stretch false twisting are the result of frequent migration due to stretching, so some of the filament groups that formed the first winding part become loose, and after false twisting tool 7, This is because there are many opportunities to form the second winding part by ballooning. The terms "continuously alternately inverted (continuously inverted and alternately twisted)", "migration" and "migrating" used in the above description are used in the following meanings. a “Continuous alternating inversion” The winding yarn is wound around the core yarn in an alternate S and Z twist pattern, but each winding part (S or Z part)
This means that the winding yarn does not have a helical winding structure in which it completely wraps around the core yarn one or more times, but is reversed even when it is wound less than 360 degrees (so-called continuous reversal). b “Migration”, “migrating” When the yarn is twisted and stretched in the false twisting process, stress is generated in the constituent fibers within the yarn depending on the helical length of the twist deformation. . The fibers located in the outer layer of the twisted yarn have a longer helical length of deformation than the fibers located in the inner layer, so a large stress is generated. The fibers with high stress in the outer layer change their positions with the fibers with low stress in the inner layer, thereby changing the distance in the radial direction from the yarn axis so as to mutually equalize the strain. As a result, the individual fibers that make up the yarn constantly change their radial position along the yarn axis (length) direction. This layer transition is called "migration," and this state is referred to as "migratory.""It'sgreat." In the present invention, the yarn serving as the core yarn 1 must have an elongation sufficient to withstand drawing and false twisting, and for this purpose, it is desirable that the elongation is at least 70% or more, preferably 100% or more. If the elongation is less than 70%, false twisting cannot be performed while stretching, and the degree to which fused filaments are generated during false twisting is also reduced. Also,
It is necessary to adjust the degree of stretching (stretching ratio) to at least 1.1 times (i.e., 10%) or more, and especially when stretching more than 1.2 times (i.e., 20%), the second winding part becomes noticeable in the composite yarn. arise. However, if stretched too strongly, not only will the winding pitch become coarse, but also the productivity will deteriorate due to thread breakage during processing. display) x 0.01 + 0.5 times or less. Figure 7 shows the range of the draw ratio (x) adopted in the present invention with respect to the elongation of the core yarn (y≧70), and x and y are within the ranges of 〓 part and 〓 part. Only then can the desired winding effect be achieved. On the other hand, in this region, the core yarn is not stretched too much, so the yarn structure of the present invention cannot be obtained, and in this region, even if an appropriate elongation is selected, it is stretched too much and winding is too difficult. It becomes rough and has an unfavorable texture. on the other hand,
In this region, due to insufficient elongation, stretch false twisting itself cannot be performed and poor winding is likely to occur. In a more special case, if the draw ratio is selected to be less than the natural draw ratio of core yarn 1 within the above-mentioned range of draw ratios (the bottom part in Fig. 7), the molecular chain orientation in the fine structure of the yarn will change. Since the strands have insufficient kinetics, the molecules have high mobility and are likely to be fused by heating during false-twisting heat setting. Therefore, when the wound state is stretched and tightened by stretching and false twisting, this fusion property is also taken into account, and a more solid composite can be expected due to the synergistic effect of both. In addition, as a high elongation material for core yarn 1, the spinning speed is 2500.
Semi-drawn yarn obtained by high-speed spinning at m/min or higher is suitable. Further, as the wrapping thread, the same material as the core thread is of course used, but also one having a higher softening point or melting point than the core thread.
By using the winding yarn with a different cross section, dyeability, etc. from the core yarn, it is possible to obtain various effects such as gloss and different color effects. However, in order to impart a cotton-like texture to the false-twisted composite yarn, it is necessary to use ultra-fine filaments that have a higher heat-fusion temperature than the core yarn 1, have a thickness of 2 de or less, preferably 1 de or less, and have a number of filaments of 40 or more. A multifilament yarn 8 made of a single fiber is wound under the overfeed, and in this state, the yarn 1 that substantially forms the core is fused, and at the same time, the sheath yarn that contacts at the interface is fused by the core yarn. It is preferable to perform heat setting while fixing at least a portion of the material. In order to effectively exhibit this feature, from the point of view of the appearance of the core-sheath structure, it is necessary to
% or more is required, and if it is 25% or more, a more preferable texture and appearance can be obtained. Further, due to the heat fusion described above, the first winding portion has a continuous alternating shape that is soft in texture. The winding overfeed rate may be considered in the same way as in the conventional case, but it is better to set it in relation to the speed of the draw roller 13. This is because the present invention uses a drawing/false twisting method (simultaneous), so if the ratio is set to the supply speed of the core yarn 1, the finished yarn will have a predetermined overfeed winding amount because the core yarn is stretched. It is not. In the present invention, the method of winding the thread is the guide 10.
In addition to the uniform winding method in which the winding point is fixed, it may also be applied to a variable winding method in which the winding point is free. A particular feature of this method is that even if the winding point is not firmly fixed and may fluctuate a little, a well-balanced yarn can be obtained due to the stretching action after winding. This is a major feature not seen in other models. In addition, the number of false twists, setting temperature, etc. may be set in the same manner as for conventional false twist and winding yarns. Table 1 shows the effects of the number of filaments in the sheath yarn and the denier of single fibers. Favorable results are obtained when the single fiber is 1 denier or less and the number of filaments is 40 or more, and more preferably 40 or less when the number of filaments is 0.5 de or less. A noticeable texture effect can be obtained when the size is larger than a book.

[Table] The total fineness of the total fibers of the sheath yarn and the total fineness of the core yarn has a suitable range from the viewpoint of the expression of the yarn structure and the texture. If the ratio of the core yarn 1 is too small, the sheath yarn 8 that comes into contact with the core yarn during processing will not be properly fixed, and an interfacial wrap layer will not be formed, resulting in a structure consisting only of the fused core yarn and the crimped yarn covering it. As a result, the desired texture effect cannot be obtained. On the other hand, if the sheath yarn ratio is too low, almost all of the sheath yarn will stick to the core yarn, and there will be no crimp covering the surface layer, making it impossible to obtain a soft texture effect. As a result of examining a combination of yarns with different total finenesses, it was found that a suitable texture can be obtained when the total fineness of the sheath yarn of the processed yarn is in the range of 0.7 to 1.4 relative to the total fineness of the core yarn. I understand. It should be noted that polyethylene terephthalate polymer is most preferable for the core thread and the winding thread, but other materials may be used depending on the purpose. For example, if an antistatic or water-absorbing polyester filament to which polyethylene glycol and/or alkyl sulfonic acid metal salts are added is used as the winding yarn, the function can be made closer to that of cotton. Of course, this sheath yarn may be a mixed fiber yarn or a co-spun (CO-SPUN) yarn with different denier, cross section, etc. within the same yarn. As described above, according to the present invention, a false-twisted composite yarn with significantly improved workability and a method for producing the same are provided, so that the success rate of weaving and knitting is improved and high-quality woven and knitted fabrics can be obtained. Example 1 Highly oriented undrawn yarn of polyethylene terephthalate
115de, 36fil (spinning speed 3200m/min, elongation 115
%) as the core yarn, and on the other hand, polyester filament yarn 65de with a fusion temperature of 250°C (the processing temperature at which fusion-bonded untwisting begins to occur when false-twisted alone),
Using 150fil as the sheath yarn, the processing temperature is 238 in the process shown in Figure 6.
℃, number of false twists 2400T/M, processing speed 100m/min, overfeed rate (F) of wrapped yarn 80%, false twist stretching ratio 1.3 times, ballooning width 5mm, wavelength 13mm
Processed in one pile. In addition, the heat fusion temperature of the core yarn at this stretching ratio is 230
It was ~235℃. The obtained composite textured yarn had a structure as shown in FIGS. 4 and 5, and contained approximately 60% of the structure. The yarn foot difference was 38.5%, and the yarn elongation was 32%. Moreover, even when this processed yarn was squeezed, no neps were generated and there were no weaving problems, and the obtained fabric had appropriate hardness and soft surface touch, and was a high-quality cotton-like fabric. Further, when the above-mentioned composite yarn was arranged as a warp (density 21/cm) and a woolly yarn was inserted as a weft, the number of stops of the loom (warp yarn breakage) was 0.2 times/hr. On the other hand, the composite yarn obtained by ballooning five times in the above example has the structure shown in Figure 1, and when this is used as the warp, the number of stops of the loom is 2.
times/hr. Example 2 The same raw yarn as in Example 1 was used, and the processing temperature was 230°C, the number of false twists was 2400T/m, and the processing speed was 100 in the process shown in Figure 6.
m/min, overfeed rate of wrapped yarn 75%, false twist stretching ratio 1.3 times, ballooning amplitude 5 mm, wavelength
Processed with one 10mm thread. The obtained processed yarn has the structure shown in Figures 4 and 5, and the cored yarn is fused, the yarn foot difference is 35%, and the elongation of the yarn is 31.
It was %. In addition, the fabric obtained from this had a texture with reduced hardness and a fluff-like soft touch. Further, the number of times the loom was stopped was measured in the same manner as in Example 1, and was 0.15 times/hr in the case of the present invention, and 2 times/hr in the comparative example (5 balloons).

[Brief explanation of the drawing]

Fig. 1 is a side view of a comparative false twisted composite yarn of the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a side view of a spun cotton yarn, and Fig. 4 is a side view of a false twisted composite yarn of the present invention. A side view showing an example of the thread, Fig. 5 is a microscopic photograph thereof, Fig. 6
The figure is a manufacturing process diagram, and FIG. 7 is a graph illustrating the stretching ratio employed in the stretching false-twisting process of the present invention. 1... core thread, 8... sheath thread, 2, 3... filament constituting the sheath thread, 2'... some filaments constituting the same sheath thread constituting the first winding part, 3'... Remaining filaments constituting the same sheath yarn and forming the second winding part, 4... Core part of the cotton spun yarn, 5... Fluff, 6... First feed roller, 7 ... false twister, 9 ... second feed roller, 10 ... sheath yarn supply guide, 11 ... heater, 12 ... balloon adjustment guide, 13 ... draw roller.

Claims (1)

[Scope of Claims] 1. In a composite false twisted yarn in which a sheath yarn made of a multifilament yarn is wound around a core yarn, some of the constituent filaments in the multifilament yarn are wound around the core yarn in an alternately twisted yarn shape ( The remaining filament is further wound in the direction opposite to the winding direction of the alternating twist portion (second winding), and thus the filament is wrapped around the core yarn within the same sheath thread. 1. A false-twisted composite yarn comprising a laminated wound portion in which the yarns are wound in a crossed manner. 2. The false twisted composite yarn according to claim 1, wherein the constituent filaments migrate between the laminated winding layers within the same sheath yarn. 3. The false twisted composite yarn according to claim 1, wherein the first winding portion has a continuous alternating inversion shape. 4. The false twisted composite yarn according to claim 1, wherein the wound filament is tightly wound in the second winding portion. 5. The composite yarn according to claim 1 or 3, wherein at least the core portion is fused. 6 The filament (single fiber) thickness of the sheath yarn is approximately
The false twisted composite yarn according to claim 1, which has a yarn weight of 1 de or less. 7. The false twisted composite yarn according to claim 1 or 6, wherein the single sheath yarn consists of 40 or more filaments. 8 The total fineness of the sheath yarn is 0.7 or more compared to the total fineness of the core yarn.
1.4 of the false twisted composite yarn according to claim 1. 9 Synthetic fiber filament (core yarn) being drawn and false twisted
On the other hand, upstream of the false twisting tool, other yarns (sheath yarns) are wound and fed under the overfeed using the rotational torque of the yarn to form a wound structured yarn, and the false twisting tool A method for producing a false-twisted composite yarn, which comprises untwisting the wound structural yarn immediately after the twisting while causing ballooning of only one pile. 10. The method for producing a false twisted composite yarn according to claim 9, wherein the minimum amplitude of ballooning is 3 mm. 11. The method for producing a false twisted composite yarn according to claim 9, wherein the ballooning wavelength is 5 to 15 mm. 12. The method for producing a false twisted composite yarn according to claim 9, wherein the core yarn has a melting temperature lower than that of the sheath yarn. 13. The method for producing a false-twisted composite yarn according to claim 9, wherein the core yarn is fused during heat-setting during false-twisting.