JPH0118170B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a special textured false-twisted yarn, and more particularly to a special textured false-twisted yarn in which a yarn with a special irregular cross section is intertwined to surround a yarn made of cellulose fibers, and has an intertwined part in the longitudinal axis direction of the yarn. It is something. Conventionally, the processing method for imparting a special hemp-like texture using thermoplastic multifilament involves false twisting the thermoplastic multifilament in a fusion high temperature region, which partially fuses the single filaments together and at the same time untwists them. There are known methods to obtain a hemp-like special texture by creating an untwisted part and using a synergistic effect with curing by fusion and actual twisting, or by methods such as first-twisting, false-twisting, false-twisting and additional twisting. However, since the former method performs false twisting in the high temperature region of fusion, the physical properties of the supplied yarn or the false twisting conditions
Slight differences in the condition of the false twisting machine itself have a significant effect on the degree of fusion and level dyeing, and are a factor in lowering the quality of processed yarn and inducing weft defects in the fabric. In addition, the latter method requires a first twisting or additional twisting process, which poses problems in terms of cost and texture. In addition, the fabric made of yarn obtained by this fusion method had poor "fitness" and poor soft feel and dry touch feeling. In view of the current situation, as a result of intensive research, the present invention focuses on the fact that when thermoplastic multifilament is subjected to false twisting, the cross-sectional shape of the single filament is deformed due to twisting and heat reception. This was achieved by discovering that it was possible to obtain a false-twisted yarn with a special texture similar to that of hemp without fusing the filaments together. To provide a special textured false-twisted yarn with a similar texture. That is, the present invention comprises a thermoplastic multifilament A consisting of a single filament having at least one special irregular cross section selected from 3 to 8 radial cross sections, and a multifilament B consisting of cellulose fibers. a false twisted yarn, in which there are 2 or more intertwined parts in the long axis direction of the yarn, in which the multifilament A surrounds the outer periphery of the multifilament B, and the leaves are interlocked and intertwined, and The gist of the special textured false-twisted yarn is that the intertwined portions are formed without the filaments being fused to each other. The present invention will be explained in detail below. The thermoplastic multifilament used in the present invention is a mixture of a thermoplastic multifilament A having a special irregular cross section selected from 3 to 8 radial cross-sections and a multifilament B comprising cellulose fibers. It is characterized by its rough threads. Next, the cross-sectional shape of the single filament constituting the multifilament A will be explained in detail. Here, a case where the cross-sectional shape is four leaves will be explained in detail as a representative example. In the case of other 3 to 8 leaves, the shapes are defined in the same manner, so the explanation will be omitted. First, in explaining the four leaves, terms indicating the cross-sectional shape of a single filament will be explained based on FIG. FIG. 1 is a sectional view showing an example of a single filament used in the present invention. Figure 1 1-1, 1-2
, draw an inscribed circle that passes through any three points of concavities a, b, c, and d, and call the largest inscribed circle X the central nucleus.The radius of this circle is "O". The protrusion-like pieces Y ₁ , Y ₂ , Y ₃ , and Y ₄ are called "lobes", and the point where the line drawn from the center "O" toward the tip of the leaf intersects with the center of the tip of the leaf is
y ₁ , y ₂ , y ₃ , y ₄ , and the lines _{oy 1 ,} oy ₂ , oy ₃ , oy ₄ connecting the center O and y 1 , y ₂ , y ₃ , y ₄ are called leaf lengths β. FIG. 2 is a side view showing an example of the special textured false twisted yarn of the present invention, in which an intertwined part 1 where real twist remains due to strong entanglement, a small amount of over-untwisted part 2, and a large number of crimped portions 3, which are present randomly in the longitudinal axis direction of the yarn. FIG. 3 is a cross-sectional view of the entangled portion 1 shown in FIG. 2, in which multifilament A surrounds and intertwines multifilament B, and the leaves of each single filament of multifilament A are deformed. They mesh and intertwine like gears, and although the single filaments are not fused to each other, they are intertwined so that they do not easily separate. FIG. 4 is a cross-sectional view of the crimped portion 3 of FIG.
Each single filament is deformed but free from each other. FIG. 5 5-1 is a sectional view of a single filament with a three-lobed cross section, and FIG. 5 5-2 is a sectional view of a single filament with a six-lobed cross section. The special textured false-twisted yarn of the present invention comprises a thermoplastic multifilament A consisting of at least one type of special irregular cross-section selected from a single filament with a radial cross-sectional shape of 3 to 8 leaves, and a cellulose fiber. A false-twisted yarn consisting of multifilament B and multifilament B, in which multifilament A is intertwined to surround the outer periphery of multifilament B, and the interlacing is such that the leaves interlock with each other in the longitudinal direction of the yarn. There are two or more sections per meter, and the intertwined sections are formed without fusing the single filaments together. In order to exhibit the linen-like texture that combines soft feel and dry touch, which is the objective of the present invention, it is necessary that the number of interlaced parts is 2 or more per M. If it is less than that, you will not be able to get a linen-like texture. More preferably, the interlaced portion is 5
It is good if there are at least K/M. In the present invention, entanglement refers to a state in which the leaves of each filament are deformed and interlocked with each other so that they are tightly intertwined to the extent that they do not easily separate, as if adjacent leaves were glued together. Further, the strength of the entanglement is extremely strong, and is such that even if a load of at least 1/10 (g/D) x the fineness D in grams is applied in the longitudinal direction, the fibers do not peel and open. This entanglement is fundamentally different in its generation mechanism, form, and effect from the joining of special cross-section yarns having an indented part, which is already known in JP-A-55-30401 and JP-A-56-68124. It is something.
In other words, the entanglement of the present invention is not just an entanglement between two single filaments, but also an intertwined part and an over-untwisted part where the multifilament as a whole is bundled by intertwining with the third and fourth filaments. , its focusing effect is extremely useful and gives a linen-like texture. The special textured false twisted yarn of the present invention has an intertwined part where multifilament A surrounds and intertwines multifilament B as shown in FIG. By mixing the crimp portions in which single filaments constituting filament B are randomly present in the long axis direction of the yarn, a special hemp-like texture that has both a soft feel and a dry touch feeling is expressed. An example of the manufacturing method for obtaining the processed yarn of the present invention will be described below. It is well known that in normal false twisting, the cross-sectional shape of a single yarn undergoes considerable deformation due to the twisting, setting and untwisting processes in the false twisting zone. The deformed state of irregularly shaped cross-section threads exhibiting an angular or leaf-like shape is complicated, and the degree of deformation is also remarkable.
When at least one type of special irregular cross-section yarn selected from the eight leaves is subjected to false twisting as multifilament A, multifilament A surrounds the outer periphery of multifilament B in the twisting zone, and the single filament of multifilament A A phenomenon in which leaves interlock with each other like gears occurs here and there. Under this gear-like meshing state, not only the leaves are deformed, but also a solid meshing phenomenon, that is, entanglement, occurs in which the leaves between the single filaments do not easily peel off, as if they were glued together. In particular, even if the more robust entanglement reaches the untwisting zone, the entangling force exceeds the untwisting swirling force, resulting in the formation of untwisted portions, that is, entangled portions. When entangled portions occur in this manner, reverse twisting is inevitably introduced to balance the false-twisting-untwisting twist from the false-twisting system.
This reverse twist is often absorbed at the crimps, but
If it is not absorbed completely, over-untwisting may occur. In this way, the result is a coexistence of entangled parts, over-untwisted parts, and crimped parts where the single yarns constituting multifilament A and multifilament B are randomly present. In order to make this intertwining of leaves more obvious, the cross-sectional shape of multifilament A needs to be at least one type of special irregular cross-section with the number of leaves selected from 3 to 8. , other circular, bar-shaped (2
In the case of leaves) and 9 or more leaves, interlacing in which leaves interlock with each other is rarely observed, and even if it does occur, the number of interlaced parts in the long axis direction of the filament is less than 2/M. If the cross-sectional shape of multifilament A is a special irregular cross-section with 3 to 8 leaves, the angles between the leaves do not necessarily have to be equally distributed.
The center may be hollow. Also, it is preferable that the leaves gradually become thinner toward the tip. Moreover, in the cross section of one single filament selected from 3 to 8 leaves, at least the top two leaves from the one with the longest leaf length have a ratio β/γ of the radius γ of the central nucleus of the cross section to the leaf length β of 2.0. It is necessary that it is above.
Preferably, half or more of the total number of leaves in the single filament has a β/γ ratio of 2.0 or more.
Below this range, that is, when β/γ is less than 2.0, the appearance of interlacing in which leaves interlock with each other is hardly observed, and only less than 2 pieces/M of entangled parts appear in the long axis direction of the filament, which is the target. A textured yarn with bunching will no longer be obtained. There is no particular upper limit for β/γ, but if β/γ exceeds 6.5, it is difficult to obtain a stable raw yarn during spinning, but even if it is possible, the phenomenon of leaf loss during false twisting is likely to occur, and it is difficult to operate. Since it is unlikely that the quality will be fully satisfactory, it is preferable that β/γ does not exceed 6.5. The angle between these two leaves is preferably 40° or more, and it is also preferable that the leaf length of the third or lower leaf is at least 1/2 of the leaf length of the first leaf. . Next, in order to express a soft, linen-like special texture, the effect depends not only on the above-mentioned cross-sectional shape, but also on the fineness of the single fibers constituting multifilament A and multifilament B. Therefore, when the synergistic effect with the leaf shape is taken into consideration, the single fiber fineness of multifilament A is preferably 2 to 32 deniers. More preferably, the denier is 5 to 20 deniers. If the single yarn fineness is less than 2 denier, it may be difficult to obtain a stable raw yarn during spinning.
In addition, in terms of texture, there is a tendency for the silky texture of the hemp-like effect to become poor. On the other hand, if the single yarn fineness exceeds 32 deniers, the stiffness of the yarn tends to be too high, and the value of the fabric obtained tends to be low. Next, multifilament B will be described in detail. Multifilament B can be used alone to produce linen-like special textured yarn with a silky feel, but it is too stiff, so it is mixed in. Multifilament B increases softness and dry touch, and gives a sense of volume. It is for. Therefore, in the intertwined part 1 or the over-untwisted part 2, multifilament B is surrounded by multifilament A and is located near the center of the yarn, and the characteristics of multifilament A are mainly exhibited and a hemp-like feel is expressed. . Here, in order for multifilament B to be surrounded by multifilament A, β/γ or single fiber fineness of multifilament B should be made smaller than that of multifilament A.
In addition, multifilament B also appears on the surface of the yarn at the crimped part 3 where the single yarns constituting multifilament A and multifilament B are randomly arranged, and the characteristics of multifilament B are added, creating a soft feel and a dry touch feeling. will be granted. For this reason, the characteristics that the multifilament B should have are that the fineness is finer in order to impart a soft feel, and preferably the fineness of the single filament is 5 deniers or less. In addition, rayon has a large surface area to give a dry touch that cannot be expressed with synthetic fibers.
It is necessary to use cellulose fibers such as acetate and triacetate. Further, cellulose fibers are more preferable because they have a high official moisture content and can provide absorbency. Furthermore, the multifilament A and the multifilament B do not need to each have a single cross-sectional shape and fineness, and may be a mixture of two or more types of single yarns. The frequency of occurrence of entangled portions due to interlacing of leaves is influenced by the cross-sectional shape of the single filament of filament A and the fineness of the single filament, but it also changes greatly depending on the false twisting conditions. In particular, the influence of the twist angle is large, and it is necessary to adopt conditions different from those generally adopted. In other words, the twist angle θ employed in general false twisting is given by the following formula, and false twisting is usually performed within a range of about 44 to 45 degrees. θ: Twisting angle (°) D: Fineness (denier) of multifilament T: Number of false twists (T/M) However, in order to create multiple intertwined parts due to the interlacing of the present invention, the twisting angle should be 30 to 40°. It is preferable to do so. If it is out of this range, no intertwined portions due to 2/M or more of entanglements will occur, and the desired linen-like texture with a soft feel may not be obtained. It is best to mix multifilament A and multifilament B mainly during the false twisting process, and the mixing ratio is 30/B in terms of weight ratio (A/B).
It is preferably in the range of 70 to 90/10, and if it is out of this range, it may not be possible to obtain a linen-like special textured yarn that has both the desired soft feel and dry touch feel. In the present invention, the thermoplastic multifilament refers to a multifilament made of a polymer having fiber-forming ability such as polyester, polyamide, polypropylene, etc., and the cellulose fiber refers to rayon, polypropylene, etc.
Refers to regenerated cellulose fibers and semi-synthetic fibers such as acetate and triacetate. The special textured false-twisted yarn of the present invention has an intertwined part in which the multifilaments A are intertwined as described above, so it exhibits a hemp-like texture due to the presence of this intertwined part. Filament A surrounds the outer periphery of multifilament B, and there are two or more intertwined parts per meter in the long axis direction of the yarn, where the leaves are interlocked and intertwined, so that the filament A has good convergence. The presence of multifilament B gives a soft feel and a dry touch feeling. Furthermore, since the intertwined portions are formed without the single filaments touching each other, the fabric has excellent uniformity of texture and excellent level dyeing properties. Therefore, when made into a fabric, it has a special texture that utilizes the fusion obtained by conventional methods.Compared to fabrics using false-twisted yarn, it has a linen-like special texture with a very high quality and ``brightness''. It can provide a stable special surface effect, and does not cause defects in the entire horizontal direction of the fabric. In addition, since the special textured false twisted yarn of the present invention is obtained by the above-mentioned manufacturing method, it is not possible to use a processing method that has the drawbacks of conventional methods such as advanced mechanical conditions, precision, management technology, and complicated work. In contrast, it is possible to easily obtain a linen-like special texture that combines a soft feel and a dry touch feeling due to entanglement, which can be achieved even under normal false-twisting conditions or several degrees of mildness. Based on this fact, compared to the well-known hemp-like special texture yarn processing method that can be obtained in the fusion high temperature range, the effect can be obtained even in the normal crimped false twisting temperature range or lower temperature range. Energy consumption can be reduced by, for example, 20 to 30%, and it is noteworthy as an energy-saving processing method. In addition to being an energy-saving processing method as described above, it can also be said that the method for producing linen-like special texture false twisted yarn can be applied, which greatly contributes to cost reduction. Hereinafter, the present invention will be specifically explained with reference to Examples. Example 1 Polyethylene terephthalate having an intrinsic viscosity [η] of 0.65 was spun through spinnerets of various shapes at a spinning temperature of 285°C and a spinning speed of 1000 m/min, followed by stretching to obtain various cross-sectional shapes shown in Table 1. Multifilament A of 100D/10F was obtained.
Of the multifilament A obtained, the cross sections of single filaments 1-3 to 1-7 in Table 1 are symmetrical, with leaves protruding radially at equal angles from the central core, and with substantially equal leaf lengths. It was a cross section. Separately, viscose rayon with a polymerization degree of 330 was spun through a circular spinning hole, followed by tension,
After desulfurization, water washing, and scouring, 50D/17F multifilament B was obtained. Multifilament B Fineness (denier) 49 Single yarn fineness (denier) 2.7 Strength (g/D) 2.1 Elongation (%) 21.5 These yarns were subjected to the following method using a Mitsubishi Heavy Industries LS-6 false twisting machine. The yarns were false-twisted under the following conditions, and the evaluation results shown in Table 1 were obtained for the false-twisted yarns obtained. Spindle rotation speed (rpm) 25.0×10 ^4Heater temperature (℃) (1st/2nd) 225/215 Temporary twist number (T/M) 1900Z Twisting angle 36.6° Overfeed rate (%) (1st/2nd 2/winding)
6.3 10 8.0 Texture was evaluated by making tube knitted fabrics and evaluating the texture.
The frequency of occurrence of entangled parts was observed under magnification under a load of 1/10 (g/D) x the number of grams equivalent to the fineness of the filament (D), and was determined as the number per meter.

[Table] Example 2 Nylon 6 having a relative viscosity of 2.6 was spun through cross-shaped spinning holes of various sizes at a spinning temperature of 280°C and a spinning speed of 1000 m/min, followed by stretching at a draw ratio of 3.3. Multifilaments A of 100D/10F having various symmetric cross-sectional shapes shown in Table 2 were obtained. These various multifilaments A and Example 1
The 50D/18F multifilament B used in Example 1 was folded and false twisted under the following conditions, and the results are summarized in Table 2. Spindle rotation speed (rpm) 25.0×10 ⁴ Heater temperature (℃) 185 Temporary twist number (T/M) 1900Z Twist angle (°) 36.6 Overfeed rate (%) -1.5/5.0

【table】 [Brief explanation of drawings]

Figures 1-1 and 1-2 are cross-sectional views showing examples of single filaments constituting the multifilament used in the present invention, and Figure 2 is a shape of the yarn in the long axis direction showing an example of the yarn of the present invention. A side view, FIG. 3 is an enlarged sectional view of the entangled portion in FIG. 2, FIG. 4 is an enlarged sectional view of the crimped portion in FIG. 2, and FIG. 5 is a single filament that constitutes the multifilament used in the present invention. It is a sectional view showing other examples.

Claims (1)

[Claims] 1. The single filament has a radial cross-sectional shape.
Thermoplastic multifilament A consisting of at least one type of special irregular cross section selected from 8 leaves
and a multifilament B made of cellulose fibers, in which the multifilament A surrounds the outer periphery of the multifilament B, and each leaf is deformed and interlocks with each other to form an intertwined part. A special textured false twisted yarn, characterized in that there are 2 or more filaments/m in the long axis direction of the yarn, and the intertwined portions are formed without each filament being fused to each other. 2 The mixing ratio (A/B) of multifilament A and multifilament B is 30/70 to 30/70 by weight.
The special textured false twisted yarn according to claim 1, which is 90/10.