JPS6140771B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing a mixed yarn consisting of two types of yarn. In general, mixed fiber yarns are made by mixing two or more types of filaments with different characteristics.
Complementing the advantages and disadvantages of each filament, making marbled yarn or heathered yarn from two types of filaments with different dyeability, or creating marbled yarn or heathered yarn from two types of filaments with different dyeing properties, It is known that a bulky yarn is obtained by mixing the fibers to form a sheath (meaning a sheath state). The present invention relates to the above-mentioned mixed fiber yarn that constitutes the core portion and the sheath portion. Such a mixed yarn can be produced, for example, by false twisting while supplying two types of yarn at different yarn feeding speeds. In this case, the yarn with a low yarn feeding speed becomes a core component, and the yarn with a large yarn feed speed becomes a sheath component, resulting in a mixed fiber bulky yarn. From this blended yarn, it is possible to obtain knitted fabrics with greater bulkiness than ordinary false twisted yarns, but conversely, as a natural consequence, the greater the bulkiness, the lower the waist of the knitted fabrics or It has the inherent disadvantage of reduced tension.
This is because the sheath component yarn of the mixed fiber yarn becomes a floating yarn in the knitted fabric, which is a defect called a so-called castella look. One way to overcome this drawback is, for example, by aligning thick filaments,
The method used is to knit and weave after plying and twisting.
It has the drawbacks of low efficiency and high cost. The present invention provides a method for efficiently producing a core-sheath type mixed fiber yarn that can eliminate this drawback. That is, the present invention has a minimum filament fineness of 3
Filament with more than twice the fineness has a fineness ratio of 50%
Polyester multifilament undrawn yarn A mixed with the following: 94% of the spinning speed of undrawn yarn A
Two types of undrawn polyester multifilament undrawn yarn B wound at the following spinning speeds are separately passed through a feed roller, and a doubling regulation device installed between the feed roller and a heat fixing device
This is a method in which seed undrawn yarns A and B are twisted with substantially the same yarn insertion angle, and are subjected to false twisting at the same time as drawing, and then wound as is or after interlacing. . The first feature of the present invention is that the filament having a fineness three times or more than the minimum filament fineness has a fineness ratio of
The purpose is to use undrawn yarn A, which is a mixture of 50% or less, as one of the component yarns. When the undrawn yarn A mixed with such thick filaments is mixed with the undrawn yarn B, it becomes a core component yarn, so that it can impart stiffness or tension to the resulting knitted fabric. The second feature of the present invention is that undrawn yarn A is combined with undrawn yarn B which is wound at a spinning speed of 94% or less of A. By employing such a method, a mixed fiber yarn can be obtained in which the undrawn yarn A is the core component and the undrawn yarn B is the sheath component. Undrawn yarn B
The spinning speed of the undrawn yarn A must be 94% or less of the spinning speed of the undrawn yarn A. If the spinning speed is higher than this,
Difference in yarn length between A and B2 component yarns (difference in yarn length between core component yarn and sheath component yarn in a mixed fiber yarn, which can be measured by dividing each component into two and measuring the length.) becomes small, and satisfactory bulkiness cannot be obtained. The greatest feature of the present invention is that A having the above characteristics,
The undrawn yarns of type B2 are passed through a feed roller separately, and the yarns are doubled at substantially the same entry angle using a yarn doubling control device installed between the feed roller and the heat fixing device, and the yarns are temporarily drawn at the same time as being stretched. The purpose is to perform the twisting process. Generally, when yarns with different filament finenesses are false-twisted, those with larger filament fineness tend to be dyed in a dark color, and those with smaller filament fineness tend to be dyed in a lighter color. Particularly in the case of the present invention in which the difference in filament fineness is increased, the difference in dyeing is large if the undrawn yarns A and B are simply aligned and subjected to stretching and false twisting at the same time. When the doubling regulating device of the present invention is used, this difference in dyeing is reduced (it is presumed that uneven heat setting is reduced), and the fibers are mixed sufficiently to the extent that there is almost no problem. At the same time, it is possible to impart a uniform yarn length difference in the length direction of the obtained mixed fiber yarn, and in the manufacturing process,
Stable processing is possible without problems such as thread breakage. The interlacing performed before winding imparts cohesiveness to the mixed yarn and improves the subsequent handling of the mixed yarn. This will be explained in more detail using the drawings. FIG. 1 is a drawing of a drawing false twisting process showing one embodiment of the method of the present invention. In FIG. 1, undrawn yarn package 12,1
2', the undrawn yarn A and the undrawn yarn B are pulled out, passed through the feed roller 1, and are doubled by the yarn doubling regulating device 2.
False twisting is performed at the same time as stretching through a heat fixing device 3, a cooling plate 4, and a false twisting device 5, and then heat treatment is performed in a heat treatment device 7 between a second roller 6 and a third roller 8. Convergence is provided between the third roller and the fourth roller 10 by the interlace nozzle 9,
It is wound up by the winding device 11. 13 is various thread guides. The yarn doubling regulating device 2 is a device for regulating (controlling) the twisting of two types of undrawn yarns, and is disposed between the entrance of the heat fixing device 3 and the feed roller 1. As the false-twisting device 5, any of a pin spindle false-twisting device, an internal-type friction false-twisting device, etc. can be used in addition to an external type friction false-twisting device. The effect of the yarn doubling regulating device 2 will be explained in more detail. Similar means of providing pins, guides, rods, etc. between two multifilament undrawn yarns to be joined have been proposed in the past. For example, in Japanese Patent Application Laid-Open No. 49-50259, as shown in Fig. 2a below, the purpose is to wrap one yarn supplied from another feed roller around one yarn during false twisting. It has been proposed to provide a pin 2 (expressed as a guiding member) to define the twisting start point. Furthermore, in Japanese Patent Application Laid-Open No. 52-1126, of two types of multifilaments to be combined fed from the same feed roller, one of the multifilaments is heat treated, and the other multifilament is left unheated and combined. When performing the false twisting process,
It has been proposed to provide a bar for preventing twisting. However, all of these methods aim to create a substantial yarn length difference between the two types of multifilaments by winding one multifilament around the other multifilament. On the other hand, in the method of the present invention, when looking at the state near the twisting start point, the second
As shown in Fig. b, the two types of multifilament undrawn yarns are twisted so that the twisting is started at substantially the same yarn entry angle, that is, the difference between θ and θ' is within 10 degrees, preferably within 5 degrees. It regulates (controls) the twisting. Therefore, the above-mentioned Japanese Patent Application Laid-Open No. 1973
-50259 and JP-A-52-1126, as shown in FIG. The method is characterized in that a substantial difference in yarn length is not generated at this point of yarn splicing, but is generated during drawing and false twisting. In this way, by providing a doubling control device and regulating the yarn entry angle, the twisting of the two types of multifilament undrawn yarns is controlled, resulting in less yarn breakage and stable false twisting and yarn length. It is possible to impart a uniform yarn length difference in the direction, and it also has the effect of improving the mixed fiber state of the multifilaments A and B. The difference in dyeability (difference in dyeing) between the filaments constituting the fine filament and the multifilament B can also be reduced. Furthermore, if a multifilament undrawn yarn B having an ultrafine fineness such as 1.0 denier after drawing and false twisting is used as the multifilament undrawn yarn B, the filament can be easily removed during false twisting without using any special fluffing device. It can be partially cut to make fluff. In this case, if a doubling control device is not used, yarn breakage will occur frequently during drawing and false twisting, dyeing differences will easily occur in the obtained mixed yarn, and the yarn entering angle will not be substantially the same. For example, if B is wound around multifilament undrawn yarn A and stretched and false-twisted, fuzz is less likely to occur. Pins, guides, rods, etc. can be used as the doubling control device, but the surface roughness with chrome plating and sand blasting is recommended.
It is preferable to use pins, guides, or rods with a surface roughness of about 0.5 to 10S, or pins, guides, or rods made of ceramic material with a surface roughness of about 0.5 to 10S, which have a low coefficient of friction. These pins, guides, rods, etc. may be inserted between the two types of multifilaments, or the two guides may be used to fix the thread path of each multifilament undrawn yarn. As mentioned above, the purpose is to start twisting two types of multifilament undrawn yarns in a substantially equivalent relationship during the drawn false twisting. Interlacing involves applying compressed air injected from pores to a running multifilament yarn to entangle the filaments that make up the yarn with each other (entanglement). In order to ensure good handling later on, it is preferable that the number of entangled parts be about 30 or more per 1 m. As the interlace nozzle, commonly known ones can be used. In the present invention, polyester multifilament refers to polyethylene terephthalate, polyethylene oxybenzoate, and repeating units thereof.
It consists of a copolymer containing 70% or more. Undrawn yarn refers to normal spinning conditions (for example, 800
This refers to undrown yarn (so-called UY) spun at a speed of ~1500 m/min), and pre-orientated yarn (so-called POY) obtained by winding at a higher spinning speed. The fineness of the filaments constituting the multifilament undrawn yarn A is not limited to two types, for example, 5.5 denier, 8.0 denier, and
Using a mixture of 3 types of 25.0 denier is a preferred method because it has the effect of making the essential dyeing differences between thick and fine fineness less noticeable. The key point is the filament with the maximum fineness, which is the component that gives stiffness and tension to the knitted fabric. The maximum fineness filament must be three times or more thicker than the minimum filament fineness.
Preferably, it is in the range of 12d to 30d after stretching. The bending stiffness of a filament is considered to be proportional to the fourth power of the diameter of the filament, so the thicker the filament, the greater the waist improvement effect. It is preferable to use a small number of fibers having a fineness of 1 to 3. In addition, if such thick filaments occupy all of the undrawn yarn A, the touch of the knitted fabric made from the mixed yarn obtained from filaments A and B will become rough and hard, and the texture will be impaired. The composition ratio thereof in the multifilament undrawn yarn A needs to be 50% or less as a fineness ratio. It is preferable to use such undrawn yarn spun from the same spinneret with different hole diameters arranged by a melt spinning method, but it is preferable to use a plurality of packages spun and wound separately. Use (align)
You can also. The multifilament undrawn yarn B may have any fineness. Generally, for example 2 to 4 denier/filament may be used. In addition, as an even finer fineness,
For example, by setting the filament to 0.7 to 1.6 denier, the filament can be made into a fluff component yarn, which is a preferred method. Multi-filament undrawn yarn A and/or B has a cross-sectional shape of 3 filaments.
A preferable effect can be obtained when the number of leaves is 8 to 8 leaves. For example, by making the cross-sectional shape trilobal, it is possible to create a unique silky span effect with strong luster and a silk-like appearance and feel. In addition, by using an 8-lobed cross section, it is possible to suppress the glare that tends to occur when using round cross-section yarns (particularly often caused by the specular reflection of light in simultaneously drawn and simultaneously false-twisted yarns). . In order to provide a yarn length difference between multifilaments A and B to make the resulting mixed yarn high in bulk,
The spinning speed of undrawn yarn B is the spinning speed of undrawn yarn A.
Must be 94% or less. There are some differences depending on the fineness composition of the undrawn yarns of types A and B, but 94
% or less, it is possible to provide a yarn length difference of approximately 2% or more (B is longer than A in the state of a mixed fiber yarn), and if it is less than this, the effect of imparting bulkiness is small. The larger the difference in winding speed between the two types of undrawn yarns A and B, the greater the difference in yarn length. Preferably it is in the range of 90% to 75%. In addition, when a plurality of constituent yarns are drawn together as the undrawn yarn A, calculation is made with respect to the spinning speed of the fine filament. When the multifilament undrawn yarns A and B are set as described above and drawn and false twisted are performed while being doubled by the yarn doubling regulating device, they are in the same positional relationship (relative) at the twisting start point. In the twisted state of the yarn in the vicinity of the downstream drawing point and after the drawing point, multifilaments A are mainly located in the center of the yarn, and multifilaments B are mainly located in the periphery. Become. As a result, multifilament B is more stretched than multifilament A with respect to the setting ratio of the drawing and simultaneous false twisting conditions, and can have a longer yarn length than multifilament A. The fineness ratio of multifilament undrawn yarns A and B is not particularly defined, but is preferably 1:
The ratio is in the range of 3 to 3:1. This will be explained below using examples. Example 1 Spun from the same spinneret at 3000 m/min
24.4 denier x 1 filament, 7.5 denier x
15 filament 8-leaf cross-section polyethylene terephthalate undrawn yarn A (filament fineness ratio 3.2 times)
and polyethylene terephthalate undrawn yarn B in Table 1 spun at a spinning speed of 2600 m/min (86.6% of A), and after stretching and false twisting using the apparatus shown in Figure 1, interlace was formed. This was done to create a mixed yarn. A woven fabric (2×2 twill) was formed using the obtained yarn and finished with dyeing.
The results were as shown in Table 1. Main processing conditions Feed roller peripheral speed (m/min) 257.0 2nd roller 6〃 (m/min) 450.0 Yarn doubling control device 2 Separate pin (4mmφ satin finish processing rod) Thread entry angle (degrees) θ: 40 θ': 41 Heat setting device 3 Length (m) 2.0 (〃) Surface temperature (°C) 205 Preheating device 5 3-axis external friction false twisting device (equipped with 8 urethane rubber discs) Number of false twists (T/m) 2390~ 2400 Interlace nozzle 9 Air pressure 4.0Kg/cm ² Flow rate
36N-/min (1 injection port)

[Table] In both Test Nos. 1 and 2, fabrics with a high waist and a rich sense of volume were obtained. Example 2 8 spun from the same spinneret at 3000 m/min
Five types of polyethylene terephthalate undrawn yarn A with different fineness composition in leaf cross section and spinning speed of 2600 m/mi
Polyethylene terephthalate undrawn yarn B with an 8-lobed cross section of 266.7 denier and 48 filaments spun with n [86.6% of A] was subjected to false twisting under the same conditions as in Example 1.
After interlacing, a woven fabric (2×2 twill) was woven using the obtained yarn and dyed. The results were as shown in Table 2. (However, the following points in the processing conditions differ from Example 1) Number of false twists (T/m) 1840 to 1800 Interlace nozzle 9 Air pressure 5.0Kg/cm ² Flow rate
85.2N-/min (2 injection holes)

[Table] Test No. 7 is a comparative example. In the fineness configuration of undrawn yarn A, if the fineness ratio of thick filament is too large (Test No. 7)
Although the stiffness and tension of the fabric are increased, the surface touch (feel) is rough and hard, which is undesirable. Further, dyeing unevenness due to the difference between the thick filament and the fine filament becomes noticeable, which is not preferable. Example 3 Undrawn yarn A used in test No. 3 of Example 2
False twisting and interlacing were performed under the same conditions as in Example 2 using polyethylene terephthalate undrawn yarn B with an eight-lobed cross section obtained by changing the spinning speed. The obtained yarn was made into a circular knitted fabric and dyed. The results were as shown in Table 3.

[Table] Test Nos. 11 and 12 are comparative examples. Table 3 shows that a fullness can be imparted by setting the spinning speed ratio of undrawn yarn B to A to 94% or less. Example 4 (Test No. 13) A 155.2 denier 18 filament triangular cross section undrawn polyethylene terephthalate yarn spun at 2500 m/min and a 36.3 denier monofilament round cross section polyethylene terephthalate undrawn yarn spun at 2500 m/min were aligned. and undrawn yarn A, 2150
It was combined with undrawn triangular cross-section polyethylene terephthalate yarn B of 307.4 denier 48 filaments spun at m/min, and subjected to false twisting and interlacing under the same conditions as in Example 1 to obtain a mixed yarn.
Using the obtained yarn, a fabric (2×2 twill) was woven and dyed. (However, the following points in the processing conditions are different from Example 1) Feed roller peripheral speed (m/min) 219.5 Number of false twists (T/m) 2040 Interlace nozzle Air pressure 5.0Kg/cm ² Flow rate
85.2N-/min (2 injection ports) The obtained fabric was a so-called silky span-like product with a strong glossy, silky appearance and excellent bulk. Example 5 Using the combination of test No. 5 of Example 2,
We changed the doubling method and performed false twisting and interlacing. (Processing conditions other than the yarn doubling method were the same as in Example 2.) The obtained mixed fiber processed yarn was made into a circular knitted fabric and then dyed (Amacron Blue RLS). The results were as shown in Table 4.

【table】

[Table] Test Nos. 14 and 15 are comparative examples. test
The dyeing unevenness of No. 14 is quite strong. The dyeing unevenness in Test No. 15 is milder than in No. 14, but relatively long dark areas can be seen here and there. On the other hand, test No. 16
is relatively less noticeable than this. In addition, in No. 14, the running condition of the thread during processing was unstable (ballooning occurred), and thread breakage occasionally occurred. Example 6 3 spun from the same spinneret at 3000 m/min
Example 1 was prepared using undrawn polyethylene terephthalate yarn A with a seed 8-leaf cross section and polyethylene terephthalate undrawn yarn B with an 8-leaf cross section of 132.6 denier 36 filaments spun at a spinning speed of 2600 m/min (86.6% of A). After stretching and false twisting under the same conditions, interlacing was performed, and the resulting yarn was used to weave a woven fabric (2×2 twill), which was then dyed and finished. The results were as shown in Table 5.

[Table] Test Nos. 18 and 19 are comparative examples. Nos. 18 and 19, which have a maximum filament fineness of 3 times or less, have insufficient or weak tension. The maximum filament fineness must be three times or more the minimum filament fineness.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing an example of an embodiment of the present invention, and FIG. 2 is a diagram for explaining a doubling regulating device, in which FIG. 2a is a conventional method and FIG. 2b is a method according to the present invention. This is the method. 1: Feed roller, 2: Doubling regulation device, 3:
heat fixing device, 4: cooling plate, 5: false twisting device, 6: second roller, 7: heat treatment device, 8: third roller,
9: Interlace nozzle, 10: Fourth roller,
11: winding device, 12, 12': undrawn yarn package, θ, θ': yarn entry angle.

Claims (1)

[Claims] 1. A polyester multifilament undrawn yarn A in which filaments having a fineness of three times or more the minimum filament fineness are mixed at a fineness ratio of 50% or less.
and polyester multifilament undrawn yarn B, which were wound at a spinning speed of 94% or less of the spinning speed of undrawn yarn A, were separately passed through a feed roller, and While the two types of undrawn yarns A and B are doubled at substantially the same entry angle using a yarn doubling regulating device installed in between, false twisting is performed at the same time as drawing, and the yarn is wound as is. , a method for producing a special blended yarn characterized by interlacing and then winding. 2. The method for producing a special mixed fiber yarn according to claim 1, wherein the filaments of the undrawn yarn A and/or the undrawn yarn B have an irregular cross section of 3 to 8 lobes.