JPS626012B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a yarn having spun yarn-like fuzz that is useful as a yarn for knitting fabrics, and a method for producing the same. Attempts have been made to obtain fluffy yarns from continuous multifilaments. For example, as a means of imparting fluffs, some of the yarns are brought into contact with a cutter having a rough and hard surface. (for example, Japanese Patent Publication No. 48-15693), a method of pulling the core yarn and covering yarn together and mainly cutting the covering yarn by rubbing (for example, Japanese Patent Publication No. 49-1989)
133643). In addition, as a method that utilizes the characteristics of the supplied yarn, for example, a method in which a low-strength filament and a normal-strength filament are temporarily twisted and then passed through a high-speed fluid region to mainly cut the low-strength filament (for example, 47-30957), multifilament undrawn yarns with different maximum draw ratios are arranged, and of the two yarns, the yarn with the lower maximum draw ratio is cut, and the yarn with the higher maximum draw ratio is not cut. A method of producing fluffy yarn by performing temporary twisting at the same time as stretching at a stretching ratio (for example,
116351). However, in the methods disclosed in Japanese Patent Publication No. 48-15693 or Japanese Patent Application Laid-Open No. 49-133643, it is difficult to control the number of fluffs (variations in the performance of the cutter, There were disadvantages such as frequent cleaning of the cutter, etc. In addition, Japanese Patent Application Laid-Open No. 47-30957 states that unevenness in the length direction of yarn with low strength manifests as uneven generation of cut fuzz, and that the number of fuzz generation changes due to variations in processing conditions and processing equipment. A problem remained. Furthermore, yarns with low strength, such as yarns with low intrinsic viscosity, have excellent anti-pilling properties when used as a fluff component, but conversely have anti-frosting properties (because the filaments become fibrillated due to abrasion). The serious drawback of being inferior to that of 2000 (a phenomenon in which areas appear white) has not been resolved. Furthermore, in the method disclosed in JP-A No. 49-116351, most of the yarns with a low maximum draw ratio are cut, so too much fuzz is generated, causing the threads to wrap around rollers, etc. The disadvantage was that it often appeared as a slub yarn, with many occurrences of lumps. Furthermore, since the residual elongation of the yarn obtained is inevitably low, yarn breakage occurs frequently in the knitting and weaving process using this yarn, and due to harsh processing conditions, the yarn obtained It also had the disadvantage of low bulk. The present inventors have intensively studied the idea of obtaining a yarn with fuzz by plucking two undrawn polyester multifilament yarns with different properties and performing a temporary twisting process at the same time as drawing. In addition to finding a method that enables stable processing by preventing the occurrence of threads and stubs, it also satisfies anti-pilling properties, eliminates concerns about anti-frosting properties, and has a desirable bulk based on the yarn length difference between two appropriate types of multifilaments. The present invention has been achieved by successfully obtaining a spun yarn-like yarn having a property of having the same properties and useful as a raw yarn for knitting fabrics. That is, the spun yarn-like yarn according to the present invention is composed of two types of polyester multifilaments (A) and (B), and the filament fineness difference Δ[d](B) _- (A) is
1.8d or more, both filaments (A) and (B) have an intrinsic viscosity of 0.60 or more, and the filament fineness of (A) is 1.6d or less, and is a spun yarn-like yarn having the following characteristics: . Number of fuzz: 40 pieces/m or less Crimp elongation rate: 23% or less Bulk level: 9 c.c./g or more Yarn length difference: 1% or more The spun yarn-like yarn of the present invention contains multifilaments (A ) exists mainly as fluff component threads. Multi-filament (A) has filament fineness.
By making it as small as 1.6 d or less, it can be easily fluffed and a soft touch can be imparted. Furthermore, by setting the filament fineness to 1.6 d or less, the strength of each filament can be lowered, thereby achieving a nearly satisfactory level of anti-pilling properties. It goes without saying that the filament fineness has an effect on the flexibility of the knitted fabric, but the smaller the filament fineness, the higher the flexibility. For example, if a knitted fabric is made using only yarns with a filament fineness of 1.6d or less, the flexibility will be too high.
The disadvantage is that the so-called waist is lost. Also in the present invention, the multifilament (A) has a filament fineness of 1.6d or less, and the multifilament (A)
However, if the filament fineness difference Δ[d](B) _- (A) between the two yarns is set to 1.8d or more, the filament fineness of the multifilament (B) will increase. By increasing , the above drawbacks can be overcome. The polyester multifilament referred to in the present invention refers to polyethylene terephthalate, polyethylene oxybenzoate, and 70 repeating units of these.
In addition to copolymerized polymers containing % or more, multifilaments are obtained from polymers containing these as main components and a third component. The intrinsic viscosity () of the two types of multifilaments is determined to be 0.60 or higher when measured at 25°C and using orthochlorophenol solvent in terms of fiber-forming ability and practical properties after being made into a product. There is a need to. Furthermore, another feature of the yarn according to the present invention is that the fluff, crimp elongation rate, bulkiness, and yarn length difference each have the above-mentioned values. The number of fuzz is a characteristic that gives a smooth feel, and the number of fuzz obtained by the measurement method described below is 40.
It is necessary that the number is less than 25 pieces/m, and preferably less than 25 pieces/m. If the number of fuzz exceeds 40 pieces/m, there will be many breakages and threads, and it is not preferable as a raw yarn for knitting fabrics. The crimp elongation rate is a characteristic that is a measure of the strength and amount of crimp, and the value obtained by the measurement method described below needs to be 23% or less in order to give a soft feel. The yarn of the present invention has a crimp elongation rate that is considerably smaller than that of general twisted yarn. (For example, if the secondary setting is not performed, the general pre-twisted yarn has a content of 30 to 40%.) The yarn according to the present invention is substantially a bulky yarn, and has a high bulkiness as a temporary twisted yarn. In addition, the bulkiness due to the yarn length difference (A<B or A>B) between the two types of multifilaments (A) and (B) that make up the yarn is combined, and it is extremely It has the characteristic of being bulky. For this reason, when made into a knitted fabric, it provides a sense of volume greater than that of ordinary twisted yarn, and also contributes to the effect of imparting a unique touch. The yarn length difference between the two types of multifilaments (A) and (B) must be 1% or more in absolute value, and if it is less than 1%, the effect of contributing to improving bulkiness will be small.
Preferably it is 3% to 12%. The method for measuring the yarn length difference is as described below. The bulkiness is 9c.c./g, which is a value obtained by the measurement method described below to obtain the desired bulkiness when made into a knitted fabric.
The above is necessary. (A), (B) There is a difference in filament fineness between the two types of multifilaments, and a difference in crimp form is observed between the two types of multifilaments, resulting in a so-called natural fiber-like morphological mix effect. This can have a subtle effect on the texture of knitted fabrics. Furthermore, unique effects can be imparted by making the filament (B) or (B) and (A) have irregular cross-sectional shapes. For example, by making the cross-sectional shape of the filament (B) or (B) and (A) three-lobed, it is possible to create a unique silky span effect with strong luster and a silk-like appearance and feel. can. Also, 8
By using a leaf cross section, it is possible to suppress the glare that tends to occur when using a round cross section yarn (particularly caused by specular reflection of light, which is common in temporary twist yarns during drawing). Since filament (A) has a small filament fineness, the effect of having an irregular cross-section of 3 to 8 leaves is smaller than that of filament (B), but with such an irregular cross-section, Therefore, it is natural that it has more favorable effects. Particularly when the filament fineness of the filament (A) is large, for example 1.2d to 1.6d, good results can be obtained if (A) also has an irregular cross section. In addition to the three-lobed shape shown in Japanese Patent Publication No. 36-20770, the shape of the irregular cross section includes the three-lobed shape shown in Japanese Patent Publication No. 42-18579, Japanese Patent Publication No. 39
The generally known 3-lobed to 8-lobed shapes described in Japanese Patent No. -22692 and the like can be used. The second invention of the present invention is a method for producing the above-described spun yarn-like yarn. That is, the degree of natural stretching
NDR difference Δ[NDR] (A) _- (B) is 2% or more, or -2
% or less, an intrinsic viscosity of 0.60 or more, and a small filament fineness (A), and a polyester multifilament undrawn yarn (B) whose filament fineness is larger than (A). ) The two types of multifilaments are passed through a feed roller separately, and a doubling control device installed between the feed roller and the heat fixing device allows the two types of multifilaments to have substantially the same yarn entry angle. While doubling the filament, perform temporary twisting at the same time as drawing to adjust the filament fineness difference Δ[d](B) _- (A).
This is a method for producing a spun yarn-like yarn, which is characterized in that the filament fineness of (A) is 1.8 d or more and the filament fineness of (A) is 1.6 d or less, and the multifilament (A) is mainly winded with fluff partially generated. One of the features of the method for producing a spun yarn-like yarn according to the present invention is that two types of multifilament undrawn yarns having different NDRs are combined and subjected to temporary twisting at the same time as drawing. The goal is to make the NDR of the filament undrawn yarn (A) larger than the NDR of (B) by 2% or more or -2% or less. The effects of this manufacturing method are as follows. (1) By combining two types of multifilament undrawn yarns with different NDRs and ``temporarily twisting them at the same time as drawing'', it is possible to selectively cut and fluff mainly one type of multifilament. can. (2) By combining two types of multifilament undrawn yarns having different NDRs and "temporarily twisting them at the same time as drawing," it is possible to impart a yarn length difference between the two types of multifilaments. (3) By setting the NDR difference Δ[NDR] (A) _- (B) to 2% or more or -2% or less, sufficient bulkiness due to the yarn length difference is imparted as yarn for knitting fabrics. It is possible. In the manufacturing method of the present invention, Δ[NDR](A)
_- When (B) is set to 2% or more, the multifilament (B) is mainly located in the center of the yarn in the pre-twisted state, and the multifilament (A) is mainly located in the periphery of the yarn. You can force it. As a result, the multifilament (A) is more overstretched than the multifilament (B) with respect to the draw ratio set in the temporary twisting conditions at the same time as drawing, and has a longer yarn length than the multifilament (B). Also, Δ[NDR](A) _-
When (B) is -2% or less, the relationship is opposite to that when it is above 2%, and the multifilament (A) is located in the center and the multifilament (B) is located in the periphery. As a result, multifilament
(B) has a longer thread length than multifilament (A). This yarn length difference is NDR in either method.
The larger the absolute value of the difference Δ[NDR], the larger it becomes. Naturally, the larger the yarn length difference, the greater the effect of improving the bulkiness of the yarn, and in order to obtain satisfactory bulkiness as a raw yarn for knitting fabrics, the absolute value of the NDR difference Δ[NDR] must be 2% or more. , preferably 5% to 25
%. The behavior of multifilaments (A) and (B) in the temporarily twisted state is as described above, but in reality, there is a complex migration of filaments between each filament (the filaments move in the longitudinal direction of the yarn). , mutually changing positions), and this migration disturbance and multifilament
It seems that due to the relatively low filament strength of (A), the weak points of the multifilament (A) are cut, and the filament (A) selectively becomes fluffy. As a result, for example, a spun yarn-like yarn having a desired number of fluffs and a substantial yarn length difference between the two types of multifilaments constituting the yarn can be produced without the need for any special fluffing device such as a cutter. can be obtained. The method for measuring NDR defined in the present invention is as described below. The method of the present invention will be explained in more detail with reference to the drawings. FIG. 1 is a drawing of a drawing and temporary twisting process showing one embodiment of the method of the present invention. In FIG. 1, undrawn yarn package 11,1
1', a polyester multifilament undrawn yarn (A) with a small filament fineness and a polyester multifilament undrawn yarn (B) with a large filament fineness are drawn out from 1' and passed through a feed roller 1. The yarn is doubled, stretched and temporarily twisted between the feed roller 1 and the second roller 6 via the heat fixing device 3, the cooling plate 4, and the temporary twisting device 5, and then the second roller 6 and the third roller 8 After being heat-treated in the heat-treating device 7 between the steps, the film is wound up in the winding-up device 9. 10 is various thread guides. The separate pin 2 is a doubling regulating device for regulating the migration of two types of multifilaments, and is arranged between the feed roller 1 and the entrance of the heat fixing device 3 for setting the temporary twist thread. The temporary twisting device 5 includes a circumferential friction temporary twisting device,
Either a 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 two threads, no special fluffing device is required, and as shown in the examples, even if the surface of the friction body is made of a soft material such as polyurethane rubber, It is possible to generate a preferable fluff, and the yarn obtained in this case has very little deterioration due to friction with the friction body, and the obtained yarn (spun yarn-like) has sufficient strength. It is. Therefore, it is preferable to use a temporary twisting device having a rubber-based friction body as the temporary twisting device. For example, the yarns obtained by the combinations shown in Examples and Table 2 all had a strength of 3.7 g/d or more. The yarn after such doubling passes through the temporary twisting device 5, whereby the temporary twist is released and at the same time becomes a yarn with fuzz and a substantial difference in yarn length. In the method for producing the spun yarn-like yarn of the present invention, a particularly effective means is to double the above-mentioned two types of polyester multifilament undrawn yarns (A) and (B) and temporarily twist them at the same time as drawing. During processing, at a position between the feed roller and the heat setting device where each multifilament is in an undrawn state, a doubling control device such as a pin, guide, or rod is provided between the undrawn yarns to be doubled, and the Migration is controlled so that the entry angles of each undrawn yarn at the starting point of the temporary twist are substantially the same, and the yarns are combined, and the drawing and temporary twist of the two types of multifilaments are started with substantially the same relationship. The goal is to ensure that 2 to double
Similar means of providing pins, guides, rods, etc. between seed undrawn yarns 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 being temporarily twisted around the other yarn supplied from another feed roller. It has been proposed to provide a pin (expressed as a guiding member) or the like in order to define the twist starting 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 multifilament is heat-treated, and the other multifilaments are combined without being heat-treated. It has been proposed to provide a bar to prevent twisting during temporary 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 drawing tentative twist starting point, as shown in FIG. The drawn yarns have substantially the same entry angles, i.e. θ and θ′
Migration is controlled so that stretching and twisting starts when the difference between the two is within 10 degrees, preferably within 5 degrees. Therefore, the above-mentioned Unexamined Patent Application Publication No. 1973-
50259 and Japanese Patent Application Laid-Open No. 52-1126, as shown in FIG.
The method of the present invention is characterized in that a substantial difference in yarn length is not generated at this yarn doubling point, but is generated during drawing and twisting. That is, if a method is adopted in which a difference in yarn length is generated at the yarn doubling point as shown in FIG. 2a, fuzz is less likely to occur during the temporary twisting process, and the object of the present invention cannot be achieved. However, by providing a doubling regulation device,
In the method of the present invention, the twist alignment of two types of multifilaments is controlled, making it possible to perform stable temporary twist processing, and at the same time, it is possible to obtain a stable number of fuzz in the length direction of the obtained yarn. On the other hand, if the yarn entry angles θ and θ' of the multifilament are not properly set in the doubling control device, the generation of fuzz will be extremely small, and if the doubling control device is not used, the number of fuzz will be reduced. In addition to increasing the variation, thread breakage becomes more likely to occur during temporary twisting due to the intensive generation of fuzz. A pin, guide, or rod can be used as the doubling control device, but a pin, guide, or rod with a chrome-plated and sandblasted surface with a surface roughness of about 0.5 to 10S, or a ceramic material may be used. It is preferable to use pins, guides, rods, etc. with a surface roughness of about 0.5 to 10S and a low coefficient of friction. These pins, guides, rods, etc. may be inserted between two types of multifilaments, or two guides may be used to fix the yarn path of each multifilament, and their purpose is as described above. As described above, the purpose is to start the drawing and twisting of the two types of multifilaments in a substantially equivalent relationship. The method of the present invention utilizes the migration behavior of the filaments of the yarn during the temporary twisting process to generate fuzz and create a yarn length difference between the two types of multifilaments that make up the yarn. This makes it possible to obtain a yarn with a high temperature. It is clear from the following experimental results that the method of the present invention does not cut the yarn under excessive tensile tension, unlike conventional methods. NDR of coiled yarn at spinning speed of 3000m/min is 46.4%
A 134.1D-18 filament undrawn polyethylene terephthalate yarn (B) and a 132.6D-62 filament undrawn polyethylene terephthalate yarn (A) having an NDR of 52.4% wound at a spinning speed of 2600 m/min were combined. Using the apparatus shown in FIG. 1, temporary twisting was carried out simultaneously with stretching at various stretching ratios. The results were as shown in Table 1.

[Table] As is clear from Table 1, even if the stretching ratio is lowered (the applied tension is lower), the occurrence of fuzz does not change significantly, but rather shows a tendency to increase. This shows that this is different from the generation of fuzz due to conventional tension cutting (cutting of filament due to high tension). Although Fig. 1 shows an embodiment in which heat treatment (secondary setting) is performed after the temporary twisting process, this heat treatment may be omitted. It is also possible to add oil or the like.The two types of multifilaments must both have an intrinsic viscosity of 0.60 or higher from the viewpoint of fiber-forming ability or practical properties after being made into a product, as mentioned above. Undrawn yarn refers to yarn under normal spinning conditions (for example, 800
~1500m/min), the so-called
obtained by undrawn yarn (so-called UY) and winding at higher spinning speeds.
It means Preoriented Yarn (so-called POY). NDR of multifilament undrawn yarn (A) and (B)
is determined by a combination of the spinning speed of each multifilament undrawn yarn, filament fineness, filament cross-sectional shape, etc. That is, even if the spinning speed is the same, the smaller the filament fineness is, the smaller the NDR will be. On the other hand, even if the filament fineness is the same, the larger the spinning speed is, the smaller the NDR will be. Therefore, for various combinations of multifilament undrawn yarn (A), (B) fineness, filament fineness, etc., Δ[NDR](A)
_- The spinning speed and other spinning conditions can be adjusted so that (B) falls within a predetermined range. The ratio of the total fineness of each of the multifilament undrawn yarns (A) and (B) is more preferably 1:1, but is not limited to this, and a range of 3:1 to 1:3 can be adopted. In addition, if uniform color development is desired, it is preferable that the difference in dyeing between the two types of multifilaments (A) and (B) is as small as possible, and this difference in dyeing is mainly determined by the filament fineness of the two types of multifilaments. Difference and multifilament undrawn yarn
A preferable range can be set depending on the relationship between NDR differences. For example, the filament fineness difference is 1.8~3.5d
When the range is set as follows, it is preferable that the NDR difference of the multifilament undrawn yarn is 5 to 25%. On the other hand, if you are aiming for a marbled coloring property called a so-called heathered look, it is best to use undrawn yarns with different dyeability for multifilaments (A) and (B). Judging from the marbled tone effect when using this method, it is relatively desirable to use an undrawn yarn with high coloring property for the multifilament (A). In the method for producing the spun yarn-like yarn of the present invention, a particularly effective means is to make the cross-sectional shape of the multifilament undrawn yarn (B) at least 3 to 8 lobes. For example, by making the cross-sectional shape of the filament trilobal as described above, it is possible to create a unique silky span effect that is highly glossy and has a silk-like appearance and feel. Also, 8
By using a leaf cross section, it is possible to suppress the glare that tends to occur when using a round cross section yarn (particularly caused by specular reflection of light, which is common in temporary twist yarns during drawing). Since multifilament (A) has a small filament fineness, the effect of having an irregular cross section of 3 to 8 lobes is smaller than that of multifilament (B), but with such an irregular cross section, Naturally, by doing so, more favorable effects can be obtained. Especially when the filament fineness of multifilament (A) is large, for example 1.2d~
In 1.6d, good results can be obtained if (A) also has an irregular cross section. The cross-sectional shape can be confirmed by microscopic observation of the cross section of the undrawn yarn. FIG. 3 schematically shows these cross-sectional shapes. That is,
Figure 3a shows a three-lobed cross section, b shows a five-lobed cross section, c shows a six-lobed cross section, and d shows an eight-lobed cross section. The method of displaying these cross sections is the circumscribed circle diameter R and inscribed circle diameter r of each figure in the figure.
The ratio (R/r) is preferably 1.10 or more. 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 can be confirmed by microscopic observation of the yarn cross section. As described above, the spun yarn-like yarn according to the present invention has anti-pilling properties and anti-frosting properties, and has preferable bulkiness based on the difference in yarn length between two types of multifilaments, and is suitable for knitting using spun yarn. It is a yarn for knitting fabrics that can produce a texture similar to that of woven fabrics. Further, by employing the manufacturing method of the present invention, the above-mentioned spun yarn-like yarn can be stably processed while preventing the occurrence of yarn breakage and nebules. The methods for measuring each characteristic of the spun yarn-like yarn and the supplied multifilament undrawn yarn of the present invention are as follows. (NDR) Figure 4 shows the supplied multifilament undrawn yarn.
It is a Stress-Strain Curve. (hereinafter S-S
Curve) In Figure 4, the constant tension extension level (straight line) and the second rising part S-S
Find the intersection (C) of the tangents (straight lines) of the curve. Divide the line segment by the length equivalent to the raw yarn length of the undrawn yarn,
The value multiplied by 100 is NDR (%). The NDR difference is calculated as follows. Δ[NDR] (A) _- (B) (%) = NDR (%) of multifilament undrawn yarn (A) - NDR (%) of multifilament undrawn yarn (B) In addition, measurement of S-S Curve The sample length is 50 mm and the tensile speed is 400%/min. (Number of fuzz) Take 10 m of sample yarn, measure the number of fuzz protruding from the surface of the yarn with the naked eye, and display it as the number of fuzz per 1 m. (Crimp elongation rate) 20 m of sample yarn was made into a skein with a circumference of 1 m, a load of 1/15 g of the indicated denier was applied, and the skein was 150 ± 2 as it was.
Heat treatment is carried out for 5 minutes in an oven at °C. After removing the cassette from the oven and letting it cool to room temperature,
Read Kasecho la. Furthermore, read the length lb of the skein when a load of four times the indicated denier is added to the skein. Crimp elongation rate (%) = [(lb-la)/lb] x 100 (bulk height) Figures 5 a to 5 d are diagrams for explaining the bulk height measuring method. In FIG. 5, two notches 13 are provided on the upper surface of the sample stage 12, the distance T between the outer edges (d in FIG. 5) is 6 mm, and the notches 13 have a width of 2.5 mm.
A flexible thin cloth tape 14 with a length of cm is stretched over the tape, and a metal fitting 15 with a pointer and a load 16 are connected to the lower end thereof. The pointer of the metal fitting 15 is used when the sample is not inserted.
Set it so that the scale 17 indicates the 0th position. For sample 18, 2 to 10 skeins of 80 m of yarn with a circumference of 1 m were prepared depending on the indicated fineness, and the skeins were hung separately in an atmosphere of 200 ± 2°C for 4 minutes without any load. For example, if the yarn is 30D, 30 x 80 x 2 = 4800, 48000 ÷
4800 = 10 = 10 skeins, 75D yarn is 75 x 80 x 2
= 12000, 48000 ÷ 12000 = 4, align the 4 cassettes in parallel. Next, the aligned skeins are folded into four as shown in FIG. 5b to form a sample 18, which is then wrapped with a thin cloth tape 14 as shown in the front view of FIG. 5C and the cross-sectional view of FIG. 5D. It is inserted between the sample stage 12 and the sample stage 12.
The total load 16 including the metal fitting with a pointer is 50 g, and the value L (cm) indicated by the pointer is read. Sample 18 is measured three times in total by moving the position, and the average value (cm) is determined. The bulk height is calculated from the following formula. Bulk level (cc/g) = Volume in tape/Year weight in tape = V/W However, V = (L) ² /π x 2.5 W = D x 100/100-SH x P x 0.025 x 1/
9000 Here, D is the fineness (denier) of the sample yarn before heat treatment, and P is the number of yarns inserted in parallel in the thin cloth tape. SH indicates dry heat shrinkage rate (%),
Make the 80m into a skein with a circumference of 1m, read the initial length l ₁ (cm) under a load of 0.1g/d, and turn this skein into a skein with a circumference of 200m.
Heat treatment is performed by suspending the specimen in an atmosphere of ±2° C. for 5 minutes without any load. The skein after heat treatment is 0.1
Read the skein length l ₂ (cm) under a load of g/d. SH is calculated using the following formula. SH (%) = [(l ₁ − l ₂ ) / l ₁ ] × 100 (difference in yarn length) Apply a load of 0.1 g/d to the sample yarn and make a marking of 30 cm, then remove the load and carefully (A ),
(B) Divide into two types of multifilaments. For each multifilament after splitting,
Measure the length between the markings under a load of 0.1 g/d. If the length of the longer multifilament between markings is Ll (cm) and the length of the shorter multifilament is Ls (cm), the yarn length difference is expressed by the following formula. Yarn length difference (%)=(Ll-Ls)/Ls×100 The present invention will be specifically explained below with reference to Examples. Example 1 An undrawn polyethylene terephthalate multifilament yarn with an intrinsic viscosity of 0.61 obtained by ordinary melt spinning was drawn with the combinations shown in Table 2 using the apparatus shown in Fig. 1 (however, no secondary setting was performed). At the same time, I did some temporary twisting. In Table 2, multifilaments (A) and (B) are both circular cross-section yarns. The physical properties of the obtained spun yarn-like wound yarn and circular knitted fabrics (dyed) using the yarn were measured. The results are summarized in Table 2. Main processing conditions Feed roller peripheral speed (m/min) 200.0 Separate pin 2 4φ satin finishing rod (Surface roughness 7S) Doubling thread insertion angle θ: 40° θ′: 42° Heat fixing device 3 length (m) 2.0 Heat fixing device 3 surface temperature (°C) 205 Temporary twisting device 5 3-axis external friction type temporary twisting device Urethane rubber-based Temporary twisting device with 8 discs attached (t/m) 2340

【table】

[Table] In Table 2, Experiment Nos. 1, 5, 6, and 8 are comparative examples for clarifying the present invention. From Table 2, it can be seen that as in Experiment No. 1, when the filament fineness of the multifilament (A) is increased, the pilling resistance deteriorates. Furthermore, flexibility tends to decrease and fuzz is less likely to occur. As in Experiment No. 5, Δ[NDR] (A) _- (B) is 0.4 (%)
Those that are small have a relatively low bulk. This is due to the small difference in yarn length between the two types of multifilaments (A) and (B) that make up the yarn. As a result, the fullness and flexibility of circular knitted fabrics are reduced. As in Experiment No. 6, it can be seen that when the filament fineness of the multifilament (A) is increased, the pilling resistance deteriorates. Furthermore, flexibility tends to decrease and fuzz is less likely to occur. In Experiment No. 8, the difference in Δ[NDR](A) _- (B) is -1.9 (%), which is small, so the bulk height is relatively low. This is due to the small difference in yarn length between the two types of multifilaments (A) and (B) that make up the yarn. As a result, the fullness and flexibility of the circular knitted fabric are reduced. Experimental Nos. 2, 3, 4, and 7 were yarns with preferable characteristics, resulting in circular knitted fabrics with satisfactory flexibility and fluffiness, and satisfactory anti-pilling properties. Example 2 Using the same conditions and the same equipment as in Example 1 No. 4, except for various changes in the cross-sectional shape of the undrawn yarn, the third
The yarns were combined and processed according to the combination shown. After the obtained yarn was made into a knitted fabric, the gloss of the knitted fabric was evaluated. The results are shown in Table 3.

[Table] In Table 3, a slight glittering phenomenon was observed in the knitted fabric of No. 4, but it was almost eliminated in No. 10, and the glittering phenomenon was completely absent in No. 11. No. 9 was a knitted fabric rich in silky luster. Example 3 Processing was carried out in the same manner and under the same conditions as in Experiment No. 3 of Example 1, except that the method of doubling was changed, and the results shown in Table 4 were obtained. Experiment Nos. 12 and 13 are comparative examples.

[Table] The doubling control device used in Experiments No. 13 and 3 was a separate pin made of alumina (surface roughness approximately 2.5S) with a diameter of 7φ. In Table 4, Experiment No. 12 had the drawbacks of large variations in the occurrence of fuzz and particularly poor workability. Experiment No. 13 had large variations in the occurrence of fluff and could not be said to be very effective. In Experiment No. 3, the number of fuzz generation was controlled, the variation was small, and the workability was also good.

[Brief explanation of the drawing]

Fig. 1 is a drawing and temporary twisting process diagram showing one embodiment of the method of the present invention, Fig. 2 is an explanatory diagram of the state of doubling two yarns, and Fig. 3 is a diagram showing the cross-sectional shape of the filament preferably used in the present invention. FIG. Figure 4 is
An explanatory diagram of the NDR measurement method, FIG. 5 is an explanatory diagram of the bulk height measurement method. 1: Feed roller, 2: Separate pin,
3: heat fixing device, 4: cooling plate, 5: temporary twisting device,
6: second roller, 7: heat treatment device, 8: third roller, 9: winding device, 10: undrawn yarn package.

Claims (1)

[Claims] 1. Two types of polyester multifilaments
Consisting of (A) and (B), filament fineness difference Δ
[d] (B) _- (A) is 1.8d or more, the intrinsic viscosity of both filaments (A) and (B) is 0.60 or more, and the filament fineness of (A) is 1.6d or less, and the following: A spun yarn-like yarn with the characteristics of Number of fuzz: 40 pieces/m or less Crimp/elongation rate: 23% or less Bulk height: 9 c.c./g or more Yarn length difference: 1% or more 2 At least (B) multifilament with 3 leaves
The spun yarn-like yarn according to claim 1, which has an eight-lobed cross-sectional shape. 3 Difference in NDR, which is the degree of natural stretching Δ[NDR](A) _-
(B) is 2% or more or -2% or less, the intrinsic viscosity is 0.60 or more, and the filament fineness is smaller than (A), and the filament fineness is smaller than (A). The two types of multifilaments of the large polyester multifilament undrawn yarn (B) are passed through a feed roller separately, and a doubling regulation device installed between the feed roller and the heat fixing device allows the two types of multifilament to be undrawn. While piling the yarn with substantially the same yarn entry angle, temporary twisting is performed at the same time as drawing.
The filament fineness difference Δ[d](B) _- (A) is 1.8d or more, and the filament fineness of (A) is 1.6d or less, and the multifilament (A) is mainly cut partially to generate fuzz and wound. A method for producing a spun yarn-like yarn, the method comprising: 4. The method for producing a spun yarn-like yarn according to claim 3, wherein at least (B) the multifilament undrawn yarn has a cross-sectional shape of 3 to 8 lobes.