JP2950678B2 - False twist composite yarn and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a false twisted composite yarn and a method for producing the same, and more particularly to a core-sheath type false twisted composite yarn.

[0002]

2. Description of the Related Art Conventionally, false twisted yarns have been widely used as means for imparting bulkiness and elasticity to synthetic fiber multifilament yarns. That is, if the synthetic fiber multifilament yarn is directly used as a woven or knitted fabric, the texture of the fabric is hard and the thickness is small. Therefore, false twisted yarns have been widely used as a means for improving the properties to be close to bulky and flexible ones such as cloths using spun yarns.
Its applications are also diverse.

[0003] In the old days, yarns mainly composed of elasticity were developed and widely used as knitting yarns. However, it cannot be used for knitting because the shape stability of the yarn is low, so it has been proposed to improve the elasticity by reducing the elasticity and increasing the bulkiness, or to supply multiple yarns at a feeding speed. A slab-like slab yarn has been proposed in which the slab yarn is randomly changed over time or the supply position is changed.

[0004] Furthermore, a core-sheath type false-twisted composite having bulkiness is provided by uniformly supplying yarns having different elongation or elongation characteristics and winding the sheath yarn alternately around the core yarn. It is also known to get yarn. These core-sheath type false-twisted composite yarns can provide yarns having relatively good shape stability by adding excellent bulkiness and twist.

[0005]

However, in the conventional core-sheath false twisted composite yarn, since the deformation given by twisting is fixed by heat treatment, the heat shrinkage of the yarn itself is inevitable. However, there is a problem that a high density and bulky knitted fabric cannot be obtained.

The present invention has been made to solve the above-mentioned problems of the prior art, while maintaining the excellent bulkiness of the core-sheath type false twisted composite yarn.
It is an object of the present invention to provide a novel core-sheath type false twisted composite yarn exhibiting a high heat shrinkage rate capable of obtaining a high-density knitted fabric, and a production method capable of efficiently producing the false twisted composite yarn. .

[0007]

In order to achieve the above object, the false twisted composite yarn of the present invention is a false twisted composite yarn having a core-sheath structure composed of at least two kinds of synthetic fiber multifilament yarns. The core yarn is mainly composed of drawn yarn, the sheath yarn is mainly composed of semi-drawn yarn, and the filaments constituting the core yarn and the sheath yarn are easily separated from each other and easily. are entangled to such an extent that can not be, the core yarn and sheath yarn is longer than the core yarn toward the sheath yarn, the false twisted composite yarn has a yarn length difference 12 to 25% in the outer sheath yarn only long min Bulges to form a bulge , and
The appearance of itself has little swelling and shows properties similar to raw silk.
At least 15% dry heat shrinkage at 80 ° C for 3 minutes
It is characterized by the above.

In the above construction, the multifilament yarn serving as the core yarn is preferably made of a synthetic fiber containing a copolymer. Further, in the above configuration, the core yarn is preferably a polyester-based synthetic fiber multifilament yarn.

In the above construction, the sheath yarn is preferably a polyester synthetic fiber multifilament yarn. Further, in the above configuration, it is preferable that the single filament fineness of the multifilament yarn constituting the sheath yarn is smaller than that of the core yarn.

Next, the method for producing a false twist composite yarn of the present invention comprises the following steps:
At least 15% dry heat shrinkage at 80 ° C for 3 minutes
When simultaneously drawing the synthetic fiber multifilament drawn yarn containing the copolymer and the synthetic fiber multifilament semi-drawn yarn into the same false twisting region and performing composite false twisting, the false twisting temperature is 100 to 160 ° C and false twisting. By setting the number to the range shown in the above formula (Equation 1), the individual filaments mainly composed of drawn yarn, the sheath yarn mainly composed of semi-drawn yarn, and constituting the core yarn and the sheath yarn The core yarn and the sheath yarn are longer than the core yarn, and the false twisted composite yarn has a yarn length difference of 12 to 25%. The sheath yarn swells outward for a long time to form a bulge , and the appearance of the yarn itself
Shows a property close to raw silk with little swelling , 180 ° C, 3
It is characterized by forming a false twist composite yarn having a dry heat shrinkage of at least 15% per minute.

[0011]

According to the configuration of the present invention, large bulkiness can be exhibited. That is, the false-twisted composite yarn is usually heat-treated at a relatively high temperature to fix the false-twist by heat treatment. Therefore, an increase in bulkiness due to the heat treatment of the false twist and a decrease in the heat shrinkage due to the heat setting appear. The false-twisted composite yarn according to the present invention exhibits a high shrinkage of at least 15% when heat-treated at 180 ° C. for 3 minutes, and the size of the shrinkage behavior is small due to the use of a low shrinkage yarn as the sheath yarn. It shows a unique property that the length of the core / sheath yarn changes. By utilizing this property, it is possible to obtain a high-density and bulky cloth which has not been obtained conventionally. That is, as described above, the false twist composite yarn having a core-sheath structure according to the present invention has a dry heat shrinkage at 180 ° C. for 3 minutes of at least 15%. Therefore, the false twisted composite yarn can exhibit high bulkiness by heat shrinkage, and thus has an excellent effect of producing a high-density bulky fabric.

As a result, a cloth having a high density is produced using the false twisted composite yarn according to the present invention, and the cloth can be densified by heat treatment later. Therefore, since the handling of the yarn is easy, the production efficiency when fabricating the fabric is excellent, and an excellent effect that a high quality fabric can be obtained is exhibited.

Further, according to the preferred configuration of the present invention in which the multifilament yarn serving as the core yarn is made of a synthetic fiber containing a copolymer, bulkiness due to further shrinkage can be exhibited. Here, the copolymer component includes, for example, isophthalic acid, adipic acid, 5-sodium sulfoisophthalic acid,
It refers to various known copolymer components such as 5 mol% of ethyl ester of both ends of bisphenol A and polyethylene glycol.

Further, according to the preferred structure of the present invention in which both the core yarn and the sheath yarn are polyester-based synthetic fiber multifilament yarns, it is possible to realize a false-twisted composite yarn which is more excellent in quality and suitable for high-density woven fabric.

Further, according to the preferred configuration of the present invention in which the single filament fineness of the multifilament yarn constituting the sheath yarn is smaller than that of the core yarn, the multifilament yarn is suitable for a high-density woven fabric having a better feeling. False twisted composite yarn can be realized.

Next, according to the structure of the method for producing a false twisted composite yarn according to the present invention, the low temperature and low number of false twists reduce the heat history and the degree of deformation applied to the core yarn and the sheath yarn. There is no operation trouble such as yarn breakage, and false twisted composite yarn can be manufactured with high production efficiency.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a schematic view showing a side surface of the false twist composite yarn according to the present invention.

In FIG. 1, the core yarn 2 is composed of a synthetic fiber multifilament yarn containing a copolymer, and is mainly located at the center of the false twist composite yarn 1, and the sheath yarn 3 is mainly composed of the false twist composite yarn 1. Is located outside. However, the individual filaments constituting the core yarn 2 and the individual filaments constituting the sheath yarn 3 are disturbed from each other and are intermittently connected to each other by an interlacing portion 4. 4, although the individual filaments are separated from each other and the bulging portion 5 is present, the false twisted composite yarn 1 is substantially separated from the individual filaments constituting the false twisted composite yarn 1. And retains the structure as a single thread.

The false-twisted composite yarn 1 according to the present invention is a false-twisted yarn, and a substantially preferable yarn length difference is 10 to 20%.
The yarn itself is characterized in that the appearance of the yarn itself is less swelling and rather presents properties similar to raw silk.

The core yarn 2, which is one of the constituent elements of the false twist composite yarn 1 according to the present invention, is made of a synthetic fiber multifilament yarn exhibiting a high dry heat shrinkage, and the yarn is mainly made of a copolymer. ing. Although the magnitude of the dry shrinkage depends on the type and content of the copolymer component, the false-twisted composite yarn has a
When a dry heat treatment is performed for
It needs to be 15% . This is a characteristic required for obtaining a high-density fabric using the false twisted composite yarn as described later.

The dry heat shrinkage for 3 minutes at 180 ° C. in the present invention refers to a value measured as follows. First, using a wrap reel having a frame circumference of 0.8 or 1 m, a small skein in which the false twisted composite yarn is wound around the frame of the reel 10 times is made, and the upper end of the small skein is hooked on a hook. the skein length was measured under a load of lower to the false twisted composite yarn 1 Hontori 1/20 g / d of skein to the length and L _0.

Next, the measured small skein is dripped without load into an oven preliminarily adjusted to a temperature of 180 ° C., left for 3 minutes, taken out of the oven and cooled by heat radiation, and the same as above. obtaining dry heat shrinkage ΔS its length subjected to measurement as L ₁ by the following equation (equation 2). This measurement is
The measurement was performed with n = 5.

[0023]

(Equation 2)

Further, the yarn length difference referred to in the present invention means a value measured as follows. First, a load of 0.1 g / d is applied to the yarn, and 1 m is marked. After that, the two yarns are separated, each length is measured, the length of the core yarn (L ₀ ) and the length of the sheath yarn (L ₁ ) are measured, and the yarn length (ΔL) is calculated by the following equation (Equation 3). )
Ask for.

[0025]

(Equation 3)

The core yarn used in the present invention may be any synthetic fiber multifilament yarn exhibiting a high dry heat shrinkage ratio. However, in consideration of the behavior of the fiber against heat, polyamide or polyester yarns may be used. Of these, polyester-based ones are often used, and polyester-based ones are particularly preferred.

Examples of the polyester it is important to exhibit high shrinkage yarn InuiOsamu 15% or more shrinkage properties by copolymerization, processing to leave InuiOsamu 15% or more by performing a composite false twisting this as core yarn This method requires a method, and when dyeing and finishing the fabric, a moderate shrinkage occurs to obtain a high-density and softer feeling with a soft feeling.

Next, the sheath yarn which is another element constituting the false twist composite yarn according to the present invention will be described. As described above, the sheath yarn 3 is mainly located outside the false twist composite yarn 1, and its length is substantially longer than the core yarn. Since the core yarn 2 and the sheath yarn 3 are partially and intermittently joined in the longitudinal direction of the yarn by the interlacing portion 4 and cannot be easily separated, it is difficult to accurately measure them. The individual filaments constituting the sheath yarn 3 bulge outward by a longer length than the individual filaments constituting the yarn 2 to form a bulge portion 5 to adjust the difference in yarn length between the two. .

The yarn used for the sheath yarn may be a drawn yarn, but a semi-drawn yarn is preferably used for the reasons described below.
In short, a semi-drawn yarn can be easily extended with a small external force as compared with a drawn yarn. The yarn length difference between the two yarns can also be generated by feeding the yarns at different speeds to the false twist region of the core yarn and the sheath yarn. However, the core yarns having extremely different elongations (low elongation yarns) can be used. ) And a sheath yarn (a high elongation yarn, for example, a partially oriented yarn (POY) obtained by high-speed yarn protection) can be supplied to the false twisting region. In the former case, since the confounding processing is difficult, the latter method is usually used.

FIG. 2 is a schematic view showing an apparatus used for producing a false twist composite yarn according to the present invention. In FIG. 2, the drawn yarn 7 and the creel (not shown) which are disassembled from the package 6 mounted on the creel (not shown) and show a high dry heat shrinkage ratio
Half drawn yarn 9 unwound from package 8 mounted on
Are supplied to the yarn supply roller 10 after being aligned. These aligned yarns are given an overfeed rate of several percent between the yarn supply roller 10 and the second yarn supply roller 11 and are entangled by the entanglement nozzle 12. The entangled drawn yarn is guided from the second yarn feed roller 11 to the false twist area A, and the false twist heater 1 arranged in the false twist area A is provided.
3. After the false-twisted crimp is given by the false-twisting element 14 to form the composite false-twisted yarn 1, the composite false-twisted yarn 1 reaches the take-up roller 15, and the composite false-twisted yarn 1 that has passed through the take-up roller 15 passes through the winding device 16. It is wound around the package 17.

In a method for producing a false-twisted composite yarn having a normal core-sheath structure, the false-twisting temperature exceeds 200 ° C., and the number of false twists has a twist coefficient α of more than 26,000. Therefore, since the elasticity depends on the elasticity of the core yarn and the bulkiness depends on the difference in the yarn length between the sheath yarn and the core yarn, the elasticity and the bulkiness are usually combined.

In the embodiment shown in FIG. 2, the heating temperature of the false twisting heater 13 provided in the false twisting area A is 100 to 160 ° C., which is lower than the temperature at which normal polyester fiber or polyamide fiber is falsely twisted. The number of twists added by the element 14 is also usually less than the number of twists for false twisting of polyester fiber or polyamide fiber. That is, it is a false twisted yarn of a sweet twist. Therefore, the false-twisted composite yarn having a core-sheath structure according to the present invention produced by such a production method has a smaller degree of crimp as compared to the appearance of a normal false-twisted composite yarn, and exhibits properties close to raw silk .

In general, the stretchability of a false twisted composite yarn having a core-sheath structure is determined by the crimping characteristics of the yarn constituting the core yarn and the difference in yarn length between the core yarn and the sheath yarn. As described above, the false-twisted composite yarn having a core-sheath structure according to the present invention has a dry heat shrinkage of at least 15% at 180 ° C. for 3 minutes. Therefore, the false twisted composite yarn can exhibit high bulkiness by heat shrinkage, and thus has an excellent effect of producing a high-density bulky fabric.

Next, a specific production example of the present invention will be described. Example 1 Polyethylene terephthalate was spun at 3,000 m / mi
POY with a draw ratio of 1.7 times obtained by melt-spinning
(85d-48fie) and copolymerized high shrinkage polyester (50d-24fie, copolymer component is bisphenol A)
2 mol% of ethyl ester at both ends and 95 mol% of ethylene terephthalate) were processed by the processing method of FIG. 2 under the following conditions and evaluated. As shown in the following (Table 1) and (Table 2), the heater temperature was 100%. ~ 160 ° C, false twist coefficient 17,
A woven fabric having a good feel could be obtained at 2,000 to 25,000. The processing yarn speed was 400 m / min. Also, the following (Table 1) shows the relationship between the heater temperature and the dry heat shrinkage of the false twisting process and the feeling of the fabric, and the following (Table 2) shows the relationship between the false twist coefficient, the yarn length difference and the feeling of the fabric. Show. The feeling of the fabric was evaluated by sensory evaluation.

[0035]

[Table 1]

[0036]

[Table 2]

As is clear from the above (Table 1) and (Table 2), it was confirmed that an excellent fabric could be obtained within the range of the present invention.

[0038]

As described above, according to the present invention, a high-density cloth can be obtained. That is, as described above, the false-twisted composite yarn having the core-sheath structure according to the present invention has a temperature of 180 ° C.
The dry heat shrinkage in 3 minutes is at least 15%. Therefore, since this false twist composite yarn can express large bulkiness by causing heat shrinkage,
This shows an excellent effect that a high-density bulky cloth can be produced.

As a result, a cloth having a high density is produced using the false twisted composite yarn according to the present invention, and the cloth can be densified by heat treatment later. Therefore, since the handling of the yarn is easy, an excellent effect is obtained in that the fabric can be obtained with high efficiency and high quality.

Furthermore, in the method for producing false twisted composite yarn according to the present invention, since the temperature is low and the number of false twists is small, the heat history and the degree of deformation applied to the core yarn and the sheath yarn are small, so that the operation such as yarn breakage is performed. A false twist composite yarn can be produced with high production efficiency without any trouble.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a false twisted yarn obtained according to an embodiment of the present invention.

FIG. 2 is a process diagram showing a manufacturing method according to one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 false twist composite yarn 2 core yarn 3 sheath yarn 4 interlaced portion 5 bulging portion 6 package 7 drawn yarn 8 package 9 semi-drawn yarn 10 first yarn feed roller 11 second yarn feed roller 12 interlaced nozzle 13 false twist heater 14 false twist Element 15 Take-up roller 16 Take-up device 17 Take-up package A False twist area

Continued on the front page (72) Inventor Kiyoshi Nakagawa 1-1-1, Kamimiyake, Heiwa-cho, Nakajima-gun, Aichi Prefecture Inside the Tokai Textile Co., Ltd. Toray Textile Co., Ltd. No. 1 Toray Textile Co., Ltd. Head Office Tokai Business Office (56) References JP-A-2-229234 (JP, A) JP-A-56-9435 (JP, A) JP-A-4-100930 (JP, A)

Claims (6)

(57) [Claims] 1. A false-twisted composite yarn having a core-sheath structure composed of at least two kinds of synthetic fiber multifilament yarns, wherein the core yarn is mainly composed of drawn yarn, and the sheath yarn is mainly semi-drawn. The individual filaments constituting the core yarn and the sheath yarn are entangled with each other to such an extent that they cannot be easily separated from each other, and the core yarn and the sheath yarn are the core yarns. longer than the yarn, the false-twist composite yarn 12
The yarn has a yarn length difference of ２５25%, the sheath yarn swells outward by a long amount to form a swelling portion , and the appearance of the yarn itself is swelling.
A false-twisted composite yarn exhibiting properties close to that of a raw yarn with little shrinkage and having a dry heat shrinkage of at least 15% or more at 180 ° C. for 3 minutes. 2. The false twist composite yarn according to claim 1, wherein the multifilament yarn serving as a core yarn is made of a synthetic fiber containing a copolymer. 3. The false twist composite yarn according to claim 1, wherein the core yarn is a polyester-based synthetic fiber multifilament yarn. 4. The false twist composite yarn according to claim 1, wherein the sheath yarn is a polyester-based synthetic fiber multifilament yarn. 5. The false twisted composite yarn according to claim 1, wherein the multifilament yarn constituting the sheath yarn has a single fiber fineness smaller than that of the core yarn. 6. A synthetic fiber multifilament drawn yarn containing a copolymer having a dry heat shrinkage of at least 15% at 180 ° C. for 3 minutes and a synthetic fiber multifilament semi-drawn yarn are simultaneously guided into the same false twist region to form a composite. At the time of performing false twisting, by setting the false twisting temperature to 100 to 160 ° C. and the number of false twists to the range shown in the following formula (Formula 1), the core yarn is mainly composed of a drawn yarn, and the sheath yarn is mainly half-stranded. The individual filaments, which are composed of drawn yarns and constitute the core yarn and the sheath yarn, are entangled with each other to such an extent that they cannot be easily separated from each other. Longer, the false-twisted composite yarn has a yarn length difference of 12 to 25%, and the sheath yarn swells outward by a longer amount to form a swelling portion ,
In addition, the appearance of the yarn itself is similar to raw silk with little swelling
A method for producing a false-twisted composite yarn, comprising forming a false-twisted composite yarn having a dry heat shrinkage of at least 15% or more at 180 ° C. for 3 minutes. (Equation 1)