JPS6111329B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a yarn having spun yarn-like fuzz as a raw yarn for knitting fabrics, and a method for producing the same. Attempts have been made to create an effect similar to that of spun yarn by generating fuzz, loops, snarls, etc. in continuous multifilaments. However, even if fuzz, loops, snarls, etc. are generated in terms of morphology, it is still unsatisfactory to approximate yarns obtained by spinning short fibers. In particular, the most distinctive feature of spun yarn is the sense of fullness (both ends or one end of the single fiber is incorporated into the yarn by the spinning process).
Effect of providing porosity as yarn)
is difficult to assign. Specifically, concrete methods for imparting fluff to continuous filaments include a method in which a part of the yarn is cut by bringing the yarn into contact with a rough cutter on the surface (for example, Japanese Patent Publication No. 48-15693), and a method in which the yarn is cut by cutting a part of the yarn by bringing the yarn into contact with a rough cutter on the surface (for example, Japanese Patent Publication No. 48-15693); There is a method (for example, Japanese Patent Application Laid-Open No. 133643/1983) in which the threads are aligned and the covering thread is mainly cut by rubbing. Another method that utilizes the characteristics of the supplied yarn is, for example, a method in which a low-strength filament and a normal-strength filament are temporarily twisted, and then the low-strength filament is mainly cut by passing through a high-speed fluid region (for example, 30957), two multifilament undrawn yarns with different maximum draw ratios are aligned, the yarn with the lower maximum draw ratio is cut among the two threads, and the yarn with the higher draw ratio is not cut. Stretching〓〓〓〓
There is a method (for example, Japanese Patent Application Publication No. 49-116351) in which fluffy yarn is produced by temporarily twisting at the same time as stretching at a certain magnification. However, with the former method of cutting fluffy yarn using a cutter, it is difficult to control the number of fluffs.
In addition, the latter method has the drawback that, in addition to fuzz control, the resulting yarn does not necessarily have satisfactory characteristics as a spun yarn. More specifically, in JP-A-47-30957, unevenness in the length direction of yarn with low strength is expressed as uneven generation of cut fuzz, and processing conditions (including unevenness in processing equipment) also cause fuzz generation. The problem is that the amount changes. Furthermore, yarns with lower strength, such as yarns with low intrinsic viscosity, have excellent anti-pilling properties when used as a fluff component, but on the other hand, they have excellent anti-frosting properties (because single yarns become fibrillated due to abrasion, this part The serious drawback of being inferior to the phenomenon of white appearance has not been resolved. In addition, in the method disclosed in JP-A-49-116351, since most of the yarns at the highest draw ratio are cut, too many fluffs are generated, resulting in winding around rollers and the occurrence of neps. In many cases, the disadvantage was that it had a slap yarn-like appearance. Furthermore, because the residual elongation of the resulting yarn is inevitably low, yarn breakage occurs frequently in the knitting and weaving process using this yarn, and the bulkiness of the yarn obtained under harsh processing conditions is reduced. It also had the disadvantage of being low. In addition, JP-A-50-25821 has an intrinsic viscosity difference of 0.1.
and the birefringence index (△nH) of the high intrinsic viscosity yarn is
15~70×10 ^-3 , birefringence of low intrinsic viscosity yarn (△
A method is disclosed for producing a yarn having a texture similar to a spun yarn by stretching and simultaneously temporarily twisting a yarn whose value (nL) is ΔnL(ΔnH−10)×10 ⁻³ .
The method is disclosed. In the method, △
The condition of nH of 15 to 70×10 ^-3 is the so-called POY
(Pre-Oriented Yarn) By using such highly oriented yarns, it is necessary to prevent the generation of fuzz during drawing and twisting and to obtain good workability. As clearly stated in the specification, the conditions were as follows. That is, in this method, when ΔnH is less than 15×10 ⁻³ , not only fluff occurs but also thread breakage is likely to occur during temporary twisting, so stable processing cannot be achieved. In addition, since this method is manufactured by simultaneous stretching and temporary twisting, the single fiber cross section of the constituent yarns is greatly deformed during the temporary twisting process, and the deformed portion tends to reflect light particularly strongly. Therefore, when this yarn is used to make a knitted fabric, it has the disadvantage that abnormal gloss (partial glitter phenomenon) tends to occur. The object of the present invention is to improve the drawbacks of the conventional spun yarn-like yarn described above, and to provide a yarn that is more similar to spun yarn using multifilament as a starting material, and a method for producing the same. That is, the present inventors have determined that the birefringence of the high-intrinsic viscosity yarn is As a result of intensive research into technology that would enable stable temporary twisting even when the thread is less than 15×10 ^-3 , we found conditions that would allow stable processing by preventing yarn breakage and neps, and also improved anti-pilling and anti-floss properties. The present invention has succeeded in obtaining a spun yarn-like yarn useful as a raw yarn for knitting fabrics, which has excellent tearing properties, unique effects on gloss and feel, and favorable bulkiness based on an appropriate yarn length difference. has been reached. The spun yarn-like yarn according to the present invention has a single yarn fineness difference △
[d] B-A is 1.0 ^d or more, intrinsic viscosity difference △ [] _BA
A yarn composed of two types of polyester multifilaments A and B having a value of 0.06 or more,
Multifilament A is a spun yarn-like yarn having a triangular to octagonal cross-sectional shape with an intrinsic viscosity of 0.54 or less and having the following characteristics. Number of fluff: 125 pieces/5m or less Crimping elongation rate: 10% or less Yarn length difference: 12% or less The spun yarn-like yarn of the present invention has low intrinsic viscosity yarn A mainly having fluff as a yarn component, and high intrinsic viscosity yarn B has a shorter yarn length than the yarn A and is mainly constituted as a core yarn component. One of the characteristics of the spun yarn-like yarn of the present invention is that it has both excellent anti-pilling properties and anti-frosting properties. This is because a polyester multifilament having an intrinsic viscosity of 0.54 or less and containing a third component is used as the low intrinsic viscosity yarn A. In other words, the lower the intrinsic viscosity, the better the anti-pilling property is.
On the other hand, the anti-frosting is reduced. In the present invention, a third component is added to the low intrinsic viscosity yarn A to increase the viscosity of the amorphous portion, thereby making it possible to achieve both the above-mentioned contradictory anti-pilling properties and anti-frosting properties. Another feature of the spun yarn-like yarn of the present invention is that it has the above-mentioned characteristic values. In other words, the number of fuzz is a characteristic that gives a smooth and soft feel, and the number of fuzz obtained by the measurement method described below is 125.
pcs/5m or less, 100 pcs/
The length is preferably 5 m or less. Fluff count is 125
If the length exceeds 5m, there are many thread breaks and threads.
It is unsuitable as yarn for knitting fabrics. The yarn length difference is a characteristic that affects the bulkiness characteristics, and the value displayed by the measurement method described below as the yarn length difference [A>B] between the two types of multifilaments A and B that make up the yarn is It must be 12% or less. If it exceeds 12%, it is not preferable because the convergence between the two types of multifilaments deteriorates and neps are more likely to occur. The crimp elongation rate is a characteristic that measures the strength and amount of crimp, and the value obtained by the measurement method described below is 10%.
The following is necessary to give a soft feel. The yarn of the present invention has an abnormally low crimp elongation rate compared to general twisted yarns, but this is due to the use of fine-grained, low intrinsic viscosity A. In order to improve the feel and flexibility of knitted fabrics, the single yarn fineness of the high intrinsic viscosity yarn B that makes up the yarn is 1.0 d or more than the single yarn fineness of the low intrinsic viscosity yarn A. It needs to be large. Also A, B2
Since there is a difference in intrinsic viscosity and a difference in single fiber fineness between the yarns, a difference in crimp form is observed due to a difference in heat fixability, and it is also possible to obtain a so-called natural fiber-like form mixing effect. Another feature of the spun yarn-like yarn of the present invention is that it has unique luster and texture. This is an effect due to the fact that the low intrinsic viscosity yarn A is made into a triangular to octagonal irregular cross-section yarn. That is, by making the cross section of the thread A triangular, it is possible to obtain a unique silky spun texture with strong luster and a silk-like appearance and feel. Moreover, by forming the octagonal cross section, it is possible to impart a dry, cotton-like or spun-like feel to the touch, although the gloss is relatively weak. The spun yarn-like yarn of the present invention described above includes a third component-added polyester undrawn yarn A having an intrinsic viscosity [IV] of 0.54 or less and a triangular to octagonal cross-sectional shape; A polyester undrawn yarn B having a birefringence (△n) of 0.06 or more larger than the undrawn yarn A and less than 15×10 ⁻³ and 2.0 to 6.0×10 ⁻³ larger than the undrawn yarn A, A doubling control device installed between the feed roller and the heat setting device at a position where the yarn is in an undrawn state is used to align the two yarns so that the twists of the two yarns start in substantially the same relationship, and draw the yarn. At the same time, it is obtained by temporarily twisting the yarn A, mainly by partially cutting the yarn A to generate fuzz, and then winding it up. One of the peculiarities of the method for producing a spun yarn-like yarn according to the present invention is that low IV polyester undrawn yarn A having a third component added and having an IV of 0.54 or less is used. As a result, the anti-pilling effect is exhibited because the IV is 0.54 or less, and since the third component is added, the amorphous part of the polyester that makes up the thread increases, resulting in excellent anti-pilling effect without reducing the anti-pilling effect. A frosting effect can be achieved. Another unique feature of the method for producing a spun yarn-like yarn according to the present invention is that two types of polyester undrawn yarns having specific intrinsic viscosity differences and birefringence differences are used. That is, polyester undrawn yarn B
Δn must be less than 15×10 ⁻³ and larger than Δn of the undrawn polyester yarn A in the range of 2.0 to 6.0×10 ⁻³ . If the △n difference is less than 2.0×10 ^-3 , not only will the undrawn yarn A frequently fluff in the temporary twisting step that is carried out simultaneously with the drawing, but also some undrawn yarn B will be cut. In this case, the traveling yarn is frequently cut during the temporary twisting process. To prevent this, if the temporary twisting process is performed under gentle temporary twisting conditions, for example, with a small draw ratio and low tension, the overall number of fuzz will decrease, but if there is a slight difference in processing conditions (for example, the temporary twisting machine tension difference between weights)
Production control is difficult and undesirable because the number of fluff changes depending on the condition (in extreme cases, there are weights with almost no fluff). On the other hand, when the △n difference exceeds 6.0×10 ^-3 , the undrawn yarn A will be located more in the outer periphery of the twisted yarn, and for this reason, the occurrence of fuzz will be reduced, and only the temporary twisting process will be possible. Therefore, it becomes difficult to generate fuzz stably. A place like this〓〓〓〓
In this case, if temporary twisting is performed under severe temporary twisting conditions, for example under high tension by increasing the drawing ratio, not only undrawn yarn A but also a part of undrawn yarn B will be cut. Selective cutting of A becomes impossible. That is, even if the amount of undrawn yarn B is small, it is undesirable for the undrawn yarn B to become cut and fuzz, as this will reduce the pilling resistance. As mentioned above, △n of undrawn yarn B and undrawn yarn A
Only by setting the difference in the range of 2.0 to 6.0 × 10 ^-3 , the undrawn yarn A having both anti-pilling properties and anti-frosting properties can be selectively cut and the necessary fluff can be generated. It is possible to prevent other undesirable yarn breakage and neps from occurring and perform stable temporary twisting processing. In addition, the yarn obtained after processing has
Due to the above-mentioned effect of the Δn difference, there is a yarn length difference [A>B] of 12% or less, which greatly contributes to improving the bulkiness. Yet another unique feature of the spun yarn-like yarn according to the present invention is the use of low IV polyester undrawn yarn A having a triangular to octagonal cross-sectional shape. That is, in a knitted fabric obtained using the yarn of the present invention having a yarn length difference, the component yarn A having a long yarn length is present in a larger amount on the front or back side of the knitted fabric, and therefore the knitted fabric is easily influenced by the characteristics of component yarn A in terms of gloss and texture. In particular, the change in gloss and texture due to cross-sectional shape is larger than expected, but
In the yarn according to the present invention, the above-described effects can be imparted by changing the cross-sectional shape of the yarn A, which greatly contributes to changes in these properties. The cross-sectional shape can be confirmed by observing the cross-section of the undrawn yarn under a microscope. FIG. 1 schematically shows these cross-sectional shapes. That is,
Figure 1 a and b are triangular cross sections (T type, Y type), c is 5
An angular cross section, d represents a hexagonal cross section, and e represents an octagonal cross section. As for the display method of these cross sections, for figures b to e, they are shown by the ratio (R/r) of the circumscribed circle diameter R and the inscribed circle diameter r of each figure, and the ratio (R/r) is preferably 1.10 or more. In addition, in the same figure a, the distance C between straight lines A and B on the x-axis, and the distance D between the intersection of the figure and the straight line drawn parallel to the x-axis at the center point H of straight lines C and D on the Y-axis. displayed. This ratio (C/D)
1.20 or more is preferable. Even if the cross-sectional shape of the undrawn yarn is set as described above,
The cross section of the yarn after the temporary twisting process undergoes deformation (e.g. stretching, compression, etc.) during the temporary twisting process, so
It is deformed from its original shape. However, even after the temporary twisting process, the original cross-sectional shape of the yarn can be confirmed by observing the cross-section of the yarn under a microscope. The third component added to the undrawn yarn A is desirably one that has the effect of increasing the viscosity of the amorphous part of the polyester (increasing the intermolecular force of the amorphous part) in terms of its internal structure, such as the following: There is something like that. Namely, aliphatic dicarboxylic acids such as oxalic acid, adivic acid, azelaic acid, and sepacic acid; aromatic dicarboxylic acids such as isophthalic acid, phthalic acid, and 2,6-naphthalene dicarboxylic acid;
Dicarboxylic acids with an alicyclic ring such as 1,2-cycloptane dicarboxylic acid, dicarboxylic acids containing elements other than carbonic acid, hydrogen and oxygen, polyfunctional compounds such as trimellitic acid, trimethyl trimellitate, pyromellitic acid, and lower versions of these Alkyl (1 to 4 carbon atoms) ester or glycol ester with 2 to 10 carbon atoms, diethylene glycol, propylene glycol, polyethylene glycol, butanediol, thioglycol, P-xylylene glycol, 1,4-cyclohexanedimethanol, 2, 2'-bis(P-2-oxyphenyl)propane, 2,2'-bis(P-oxyethoxyphenyl)propane, other polyoxy compounds such as glycerin and pentaerythritol, P-oxyethoxybenzoic acid, P-okimimethylbenzoic acid acid,
Glycolic acid, etc. Even more preferable third
The components include dicarboxylic acids such as isophthalic acid and 2,6-naphthalene dicarboxylic acid, and polyfunctional compounds such as trimellitic acid, trimethyl trimellitate, and pyromellitic acid, and the preferred amount added is 1 to 10 mol% based on the total polyester. It is. In addition, other pigments such as carbon black, titanium oxide, and phthalocyanine, and phosphorus compounds such as phosphoric acid and phosphorous acid may be added to the undrawn yarn A. The undrawn yarn B may or may not contain the third component. However, from the point of view of the difference in dyeability of the yarn after processing, it is preferable to use a yarn that has the same dyeability as the undrawn yarn A. Also, the IV of undrawn yarn B
is preferably 0.60 or more in order to prevent the generation of cut fuzz in the yarn B during the temporary twisting process, and the difference between the yarn B and the undrawn yarn A is
The IV difference needs to be 0.06 or more. The cross-sectional shape of the undrawn yarn B can be sufficiently effective even if it is round, but it may also have an irregular cross-section, and it is more preferable to have the same cross-sectional shape as the undrawn yarn A. Further, Δn of the undrawn yarns A and B is determined by a combination of the spinning conditions of each yarn, such as spinning speed and single yarn fineness. That is, for example, even if the spinning speed is the same, the smaller the single fiber fineness is, the larger the Δn is. On the other hand, even if the single fiber fineness is the same, the faster the spinning speed is, the larger the Δn is. Therefore, various combinations such as the fineness of the undrawn yarns A and B and the single yarn fineness can be adjusted by adjusting the spinning speed, other spinning speeds, and other spinning conditions so that the Δn difference is within a predetermined range. can. A preferable combination of single yarn fineness is that undrawn yarn B is set thicker than undrawn yarn A, and the difference in single yarn fineness is 1.0.
The above is to be achieved. A particularly effective means in the method for producing the spun yarn-like yarn of the present invention is to align two types of polyester undrawn yarns A and B and perform a temporary twisting process.
A yarn doubling regulating device (bin, guide, rod, etc.) is provided between the two yarns to be doubled at a position between the feed roller and the heat fixing device where the yarn is in an undrawn yarn state;
The purpose is to control the migration of the two yarns at the weaving starting point so that the weaving of the two yarns to be combined starts in substantially the same relationship. Although similar means for providing pins, guides, rods, etc. between two yarns to be joined have been proposed in the past, the means of the present invention differs in purpose and means from these. For example, in Japanese Patent Application Laid-open No. 49-50259, as shown in Fig. 2a below, one yarn in the temporary twist,
In order to define the twist start point for the purpose of winding the other yarn fed from the other feed roller,
It has been proposed to provide a pin (expressed as a guiding member) or the like. In addition, in JP-A-52-1126, out of two types of yarns to be combined fed from the same feed roller, one yarn is heat-treated, and the other yarn is unheat-treated and is combined and tented. It has been proposed to provide a bar to prevent twisting during twisting. However, all of these methods are aimed at creating a substantial difference in yarn length between the two yarns by winding one yarn around the other yarn. On the other hand, the doubling regulating device (migration regulating device) used in the method of the present invention is different in purpose and means from those of the known method described above, as will be explained below. That is, looking at the state near the weaving start point, the method of the present invention can be applied at the joining point of two yarns as shown in FIG. In this method, the migration control device is set so that the twisting starts when the difference between the two directions is within 10 degrees, preferably within 5 degrees. Therefore, the conventional method (the above-mentioned Japanese Patent Application Laid-open No. 49
-50259 and 52-1126), there is already a yarn length difference between the two yarns at the time when twisting starts as shown in Figure 2a, whereas in the method of the present invention, there is a substantial yarn length difference at this point. It has the characteristic that it does not cause any difference in yarn length. A more detailed comparison of the conditions near the twist start point shows that in the conventional method, as shown in Figure 2 a, another yarn B is wound around the yarn A that is to become the core yarn. Therefore, the tension of yarn A is higher than that of yarn B, and therefore the angle Θ≪ with respect to the yarn running direction after yarn doubling
Θ', and the larger the winding amount is, the larger this difference becomes. On the other hand, in the vicinity of the twist start point in the present invention, as shown in FIG.
Since the twists are inserted in a substantially equivalent relationship, the angle Θ≒Θ' is established (2 in Figures 2a and b indicates the cross section of the pin). If the conventional winding method shown in FIG. Moreover, most of the difference in yarn length in the yarn obtained by the method of the present invention after temporary twisting occurs during temporary twisting at the same time as drawing, and the difference in yarn length occurs at the beginning of twisting in the state of undrawn yarn. There is no substantial yarn length difference in the vicinity of the point. By setting the doubling control device as described above, the method of the present invention controls the twist alignment of the two yarns, and as a result, the two types of yarn constituting the yarn obtained after the temporary twisting process are controlled. The uneven dyeing caused by the difference in dyeing degree between yarns is reduced, and
This makes it possible to obtain stable fuzz (number) in the length direction of the yarn. On the other hand, if the doubling control device is not used, uneven dyeing will occur between the two yarns, and the number of fuzz will also vary, making yarn breakage more likely to occur during temporary twisting. This is as shown in Example 5 below. 〓〓〓〓
The above-mentioned doubling regulating device provided between the two yarns to be doubled can be a pin, a guide, a rod, etc., but a drawing pin with a surface roughness of about 0.5 to 10S whose surface is chromed and sandblasted, It is preferable to use a guide or a pin or guide made of ceramic material with a surface roughness of about 0.5 to 10S and which has a low coefficient of friction. These pins, guides, rods, etc. may be inserted between two threads, or two guides may be used to fix the thread path of each thread, and their purpose is as described above. The purpose is to start the twists of the two yarns in a substantially equivalent relationship. The method of the present invention will be explained in more detail with reference to the drawings. That is, FIG. 3 shows a preferred drawing and temporary twisting process diagram of the method of the present invention, in which a low intrinsic viscosity polyester undrawn yarn A and a high intrinsic viscosity polyester undrawn yarn B are aligned, and the feed roller 1 Temporary twisting is performed at the same time as stretching between the rollers 5 and 2nd rollers 5, and then heat treatment (secondary setting) is performed in a heat treatment device 6 between the 2nd rollers 5 and 3rd rollers 7 as required, and winding is performed in a winding device 8. take. In Fig. 3, 2 is a separate pin (pairing regulating device) for regulating the migration of two yarns, 3 is a heat fixing device for setting after temporary twisting, 4 is a temporary twisting device, and g is various types. This is a thread guide. Note that the above-mentioned alignment refers to a mode in which two types of yarns are run separately until they pass a feed roller, and then they are combined between the feed roller and the heat-fixing inlet, as shown in FIG. The yarn after the yarn is untwisted by passing through the temporary twisting device 4, and at the same time becomes a yarn in which fuzz and yarn length difference have appeared. Although FIG. 3 shows an embodiment in which a secondary set is performed, this secondary set may be omitted as described above. Further, depending on the purpose, for example, Corning oil or the like may be added before winding the yarn. As the temporary twisting device 4, in addition to the exemplified external friction temporary twisting device, any method using a temporary twisting pin, or an internal friction temporary twisting device can be used. However, in the present invention, as a result of the appropriate combination of the two yarns, no special fluffing device is required, and as shown in the examples, it is preferable that the surface of the friction body is made of a soft material such as rubber. Because it can generate fuzz,
In this case, the obtained yarn is characterized by very little deterioration due to friction with the friction body, and the obtained spun yarn-like yarn has sufficient strength.
Therefore, it is preferable to use a temporary twisting device having a rubber-based friction body as the temporary twisting device. The methods for measuring each characteristic of the spun yarn-like yarn and the supplied undrawn yarn of the present invention are as follows. (Intrinsic viscosity IV) Dissolve the sample thread in O-chlorophenol and add 25±
This is a value measured at 0.1℃. (Birefringence Δn) Measured by a conventional method using a polarizing microscope. However, it is difficult to measure yarns with irregular cross sections as they are, so
A round cross-section yarn is obtained under the same conditions as those for melt spinning the yarn, and its Δn is measured and expressed as that value. (Thread length difference) 30cm with a load of 0.1g/d applied to the sample thread
After removing the load, carefully divide the yarn into two component yarns, A and B. A load of 0.1 g is applied to each component yarn after division, and the length between the markings is measured. Assuming that the length of component yarn A is L _A (cm) and the length of yarn B is L _B (cm), the yarn length difference is calculated from the following equation. Yarn length difference (%) = [(L _A - L _B )/L _B ] x 100 (Number of fuzz) Measured using a fuzz counting device DT-104 manufactured by Toray Engineering Co., Ltd. under the following conditions. Slit width (mm) 1.0 Yarn speed (m/min) 50 Selector S (Crimp elongation rate) Put 20 m of sample yarn into a skein with a circumference of 1 m, apply a load of 1/15 g of the indicated denier, and swipe it at 150°±.
Heat treatment is performed in an oven at 2° C. for 5 minutes. After removing the cassette from the oven and letting it cool to room temperature,
Read the length of the skein, la. Furthermore, when a load of 4 times the indicated denier is added to this skein, the length of the skein becomes lb.
I Read. The crimp elongation rate is calculated using the following formula. Crimp elongation rate (%) = [(lb-la)/lb] x 100 The present invention will be explained in detail with reference to Examples below. Example 1 Undrawn yarn A: diisophthalic acid as the third component
Six types of polyethylene terephthalate with different IV containing 0.5 wt% titanium oxide were spun at a spinning speed of 1050 m/min, and a T-shaped triangular cross section (C/D
=2.5 to 2.8) Undrawn yarn. Undrawn Yarn B: Polyethylene terephthalate with no third component added (titanium oxide 0.5wt%) was spun at a spinning temperature of 290°C and a spinning speed of 1450 m/s.
The yarn was spun at a speed of 200 denier, 18 filaments, and round cross-section undrawn yarn. The undrawn yarns A and B were aligned and subjected to drawing and temporary twisting using the apparatus shown in FIG. 3, and then a second setting was performed to obtain a spun yarn-like yarn having fuzz. The main processing conditions are as follows.

【table】

[Table] After processing the yarn into circular knitted fabric, dye
It was stained with Amacron Blue RLS and evaluated for pilling and frosting properties. The results were as shown in Table 1.

[Table] 〓〓〓〓

[Table] From Table 1, it is clear that undrawn yarn A has anti-pilling properties if the IV is 0.54 or less. Moreover, the anti-frosting property has also reached the level targeted by the present invention. Example 2 Undrawn yarn A: polyethylene terephthalate to which the third component shown in Table 2 and 0.5 wt% titanium oxide were added was spun at a spinning speed of 1050 m/min, with an IV of 0.48 to 0.52 and △n of 5.2×10 It was made into an undrawn yarn of 200 denier and 36 filaments with an octagonal cross section having a value of ^-3 . Undrawn yarn B: Polyethylene terephthalate to which no third component is added but 0.5 wt% titanium oxide is added is spun at a spinning speed of 1450 m/min, and has a value of IV of 0.63 and △n of 9.6 × 10 ^-3 A 200 denier, 18 filament round cross-section undrawn yarn was used. The yarns obtained by processing the undrawn yarns A and B under the same conditions as in Example 1 were evaluated in the same manner, and the results are shown in Table 2.

【table】

[Table] From Table 2, it is clear that when undrawn yarn A containing the third component is used, anti-pilling properties and anti-frosting properties are also satisfied. Example 3 Undrawn yarn A: 1 mol% of isophthalic acid, 1 mol% of trimethyl trimellitate, and titanium oxide
Polyethylene terephthalate to which 0.5 wt% was added was spun at a spinning temperature of 273° C. and the spinning speed was varied to obtain an undrawn yarn with an IV of 0.49, 200 denier, and 36 filaments with an octagonal cross section. Undrawn yarn B: titanium oxide without adding a third component
Polyethylene terephthalate added with 0.5 wt% was spun at a spinning temperature of 290°C and a spinning speed of 1450 m/s.
It was spun at a speed of 200 denier, 18 filaments, and undrawn yarn with a round cross section of IV0.63. The undrawn yarns A and B were aligned and processed under the same conditions as in Example 1 (however, no secondary setting was performed). The results of evaluating the properties of the obtained yarn are shown in Table 3. 〓〓〓〓

[Table] As is clear from Table 3, △ of undrawn yarns A and B
If the n difference (△nB-A) is less than 2 × 10 ^-3 , processability will be relatively poor and the yarn length difference will also be about 5%.
This results in a disadvantage in terms of bulkiness. At the same time, the number of fuzz increases rapidly, making it difficult to manage the number of fuzz in actual production, and the yarn tends to break frequently due to the fuzz wrapping around the roller. On the other hand, it is also clear that when (ΔnB-A) exceeds 6×10 ⁻³ , fuzz is less likely to occur. In this case, the number of fluffs can be increased by increasing the drawing ratio, but in such a case, there is a risk that the undrawn yarn B will begin to break, which is not preferable. By setting (△nB-A) in the range of 2 to 6×10 ^-3 , stable processing can be performed.
A yarn having the desired properties is obtained. Example 4 Undrawn yarn A: 1 mol% of isophthalic acid, 1 mol% of trimethyl trimellitate, and titanium oxide
Polyethylene terephthalate added with 0.5wt% was spun at a spinning temperature of 273℃ and a spinning speed of 1050m/
The yarn was spun at a speed of 200 denier, 36 filaments, and an octagonal cross-section undrawn yarn with IV of 0.49 and Δn of 5.3× ^-3 . Undrawn yarn B: Polyethylene glycol 3.0wt%
and polyethylene terephthalate added with 0.5wt% titanium oxide at a spinning temperature of 290℃.
Spinning at a spinning speed of 1450 m/min, IV 0.63,
A 200 denier, 18 filament, octagonal cross-section undrawn yarn with Δn of 9.1×10 ⁻³ was prepared. The undrawn yarns A and B were aligned and processed under the same conditions as in Example 3 (with the addition of 0.8% Corning oil). The obtained yarn has a fuzz count of 69.5/5m,
Yarn length difference 5.9%, strength 3.0g/d, single yarn fineness difference 2.1d,
It was a spun yarn-like yarn with a crimp elongation rate of 4.8% and little difference in dyeing between the two component yarns. When weaving a 2/2 twill using the above yarn both vertically and horizontally, the fabric had bulkiness (voluminous feel).
The resulting product was rich in texture, soft, and had a spun-like touch and a good texture. In addition, the yarn is heated to be rolled back into cheese to make it softer (secondary set).
Knitted fabric (interlock) knitted after performing
〓〓〓〓
It also had a good texture with a soft spun-like touch. Note that the woven and knitted fabrics are
Particularly, there was little noticeable glare when viewed under spotlight irradiation or direct sunlight, and it had the effect of mildly suppressing the gloss (matte effect) that is characteristic of temporary twist yarns at the same time as drawing. Example 5 In order to clarify the effect of the migration regulating pin (thread doubling regulating device), a test was conducted by changing the state of the migration regulating pin in the process shown in FIG. Note that the same undrawn yarns A and B as in Example 4 were used. Other processing conditions are as follows. 1st roller (1) peripheral speed (m/min) 121.2 2nd roller (5) peripheral speed (m/min) 400.0 3rd roller (7) peripheral speed (m/min) 400.0 Heat fixing device (3) length (m) 1.5 Grooved hot plate Heat fixing device (3) Surface temperature (℃) 205 Temporary twisting device (4) 3-axis external friction temporary twisting device, equipped with 4 urethane rubber disks Temporary twisting number (T/m) 2580-2670 Winding tension (g) 8 to 10 The migration regulating pin used in this example was made of alumina (surface roughness 2.5S) and had a diameter of 7 mm. The test results are shown in Table 4.

[Table] When the migration control pin was not used (experiment No. 21), there was a relatively noticeable difference in dyeing compared to No. 22 and No. 23. In addition, in Experiment No. 21, there was a lot of fluff, and there were many neps and thread breakage occurred frequently. The conventional method (Experiment No. 22) in which the yarn was wound around the core thread was less likely to generate fuzz and was more likely to cause differences in dyeing. experiment
No. 23 is the method according to the present invention, and the dyeing difference is relatively small, processability is good, and a satisfactory yarn can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a diagram schematically showing the cross-sectional shape of the irregular cross-section yarn, Fig. 2 is a diagram showing the state of two yarns being combined, and Fig. 3
The figure is a diagram showing a preferable stretching and temporary twisting process of the present invention. 1... Feed roller, 2... Yarn doubling regulation device,
3... Heat fixing device, 4... Temporary twisting device, 5...
2nd roller, 6... Heat treatment device, 7... 3rd roller, 8... Winding device, A... Low intrinsic viscosity polyester undrawn yarn, B... High intrinsic viscosity polyester undrawn yarn. 〓〓〓〓

Claims (1)

[Scope of Claims] 1 Consisting of two types of polyester multifilaments A and B, each having a single yarn fineness difference Δ[d]B-A of 1.0d or more and an intrinsic viscosity difference Δ[IV]B-A of 0.06 or more A spun yarn-like yarn having a triangular to octagonal cross-sectional shape with an intrinsic viscosity of 0.54 or less and a multifilament A containing a third component, and having the following characteristics. Number of fuzz: 125 pieces/5 m or less Crimping elongation rate: 10% or less Yarn length difference: 12% or less 2 Undrawn polyester fiber yarn A with a third component added and having an intrinsic viscosity of 0.54 or less and a triangular to octagonal cross-sectional shape
and a polyester resin having an intrinsic viscosity of 0.06 or more greater than the undrawn yarn A, a birefringence (△n) of less than 15×10 ⁻³ and 2.0×6.0×10 ⁻³ greater than the undrawn yarn A. The undrawn yarn B is set at a position between the feed roller and the heat fixing device where the yarn is in an undrawn yarn state, and the corners at which the two yarns are inserted are made substantially equal. A method for producing a spun yarn-like yarn, which is characterized in that the yarn A is partially cut to generate fuzz by pulling it in parallel, drawing it and simultaneously subjecting it to a temporary twisting process, and then winding it up.