JP2908578B2 - Method for producing bulky textured yarn and composite bulky textured yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of a bulky processed yarn excellent in deep dyeing effect and a composite bulked processed yarn having a moderate swelling in addition to the deep dyeing effect and suitable as a yarn for woven or knitted fabric. It is about the method.

[0002]

2. Description of the Related Art A method of obtaining a false twisted yarn from a polyester highly oriented undrawn yarn (hereinafter referred to as an undrawn yarn) obtained by spinning at a normal speed and then drawing at a low magnification or by high speed spinning. In general, a simultaneous drawing and twisting method is employed. The false twisted yarn obtained by this simultaneous drawing false twisting method is not inferior to the false twisted yarn obtained from a general drawn yarn in both crimp characteristics and yarn quality, and is widely used for general clothing.

[0003] On the other hand, with the recent trend toward high quality, there is a demand for a differentiated processed yarn having an excellent deep dyeing effect as seen in formal black and the like. For this reason, when simultaneously drawing and untwisting an undrawn yarn, a method has been attempted in which the draw ratio is reduced as much as possible to perform false twisting, thereby suppressing the degree of orientation of the yarn and increasing the deep dyeing effect. However, if the draw ratio is reduced, thread breakage occurs due to ballooning in the normal pin type false twisting method, and twisting efficiency deteriorates due to low tension in the flexion type. It is the current situation.

Therefore, a method of false twisting using a fluid swirl nozzle has been proposed as a twisted body in place of the pin type or the friction type. For example, Japanese Patent Publication No. 59-348
No. 10 discloses that a semi-drawn yarn is subjected to false twisting at a low draw ratio using a fluid twisting element, and then drawn at a draw ratio of 1.05 to 1.7 times to produce a crimped yarn. A method is described. This method does not aim at the deep dyeing effect, but is a false twisting method that saves energy and speeds up. However, a fluid swirling nozzle is used as the twisted body, and a low draw ratio is applied to the semi-drawn yarn. Since false twisting is applied to the yarn after false twisting, that is, the yarn at the time of primary drawing, a deep dyeing effect can be expected, but due to the structure of the twisted body, twisting tension, untwisting tension and Therefore, there was a drawback that yarns with a stable quality could not be produced due to easy occurrence of unevenness in stretching inside the twisted body.

[0005] Also, there have been proposed a number of methods for subjecting a processed yarn obtained by subjecting a highly oriented polyester unoriented yarn to simultaneous false twisting to a fluid jet treatment. However, since the processed yarn obtained by these methods has entanglement and loop fluff, the bunching property is improved and the unwinding property from the wound body is improved, and spun like swelling is obtained, but deep dyeing is performed. There was a problem that it was not effective.

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and has a bulky processed yarn excellent in deep dyeing effect and a moderate bulge in addition to the deep dyeing effect. It is a technical object of the present invention to provide a method for stably producing a composite bulked yarn suitable for use as a yarn.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. As a result, the tension applied to the yarn during false twisting is set to be equal to or less than the heat shrinkage stress of the yarn and twisted. It was found that if the difference between the tension and untwisting tension is reduced and false twisting is performed without stretching undrawn yarn, the degree of orientation of the yarn is suppressed, dyeing properties are improved, and the quality is stable. Arrived at the present invention.

That is, the present invention has the following configuration. (1) A polyester highly oriented undrawn yarn having a birefringence (Δn) of 20 × 10 ⁻³ to 80 × 10 ⁻³ is obtained by using a fluid swirl nozzle as a twisted body, with a false twist coefficient of 20,000 or less and a draw ratio of 1. 0 or less, twisting /
Producing a bulky processed yarn, wherein the untwisting tension ratio is 0.8 to 1 and the twisting and untwisting tension is performed under a tension not more than the maximum heat shrinkage stress of the undrawn yarn. Method.

(2) A method for producing a bulky processed yarn, which comprises subjecting the bulky processed yarn obtained in the above (1) to fluid injection processing.

(3) A composite bulked yarn obtained by combining the bulky yarn obtained in the above (1) with a polyester multifilament yarn having an elongation of 40% or less and performing fluid injection processing. Production method.

The maximum heat shrinkage stress was recorded on a recorder using a commercially available Kanebo thermal stress meter KF-2 (manufactured by Kanebo Engineering Co., Ltd.).
It is a value obtained by dividing the peak stress value by the denier of the yarn.

Hereinafter, the present invention will be described in detail. First, the first invention is to perform a false twist crimping process without stretching an undrawn yarn to obtain a bulky processed yarn excellent in deep dyeing effect. Therefore, as the yarn to be supplied to the false twisting process,
It is necessary to use an undrawn yarn having a birefringence (Δn) in the range of 20 × 10 ⁻³ to 80 × 10 ⁻³ , particularly 40 × 10 ⁻³ to 70 × 10 ^−3.
Are preferred. If the birefringence (Δn) is less than 20 × 10 ⁻³ , the material will be melted during false twisting, and the physical properties will change significantly over time, causing variations in quality. The birefringence (Δn)
^Exceeds 80 × 10 ⁻³ , the deep dyeing effect aimed at by the present invention cannot be obtained.

Next, as the conditions of false twisting, it is necessary that the undrawn yarn is subjected to false twisting at a draw ratio of 1.0 or less, that is, without drawing the undrawn yarn. Processing is preferred. When the undrawn yarn is false-twisted at the same time as drawing, the degree of orientation of the fiber is advanced, the birefringence (Δn) is increased, the dyeing property is reduced, and the deep dyeing effect is significantly impaired.

Therefore, in the present invention, as a means for performing the false twisting without stretching the undrawn yarn, instead of the above-described pin-type or friction-type false twisting method, a fluid swirl using a fluid as a twisted body is used. A nozzle is used. By using this fluid swirling nozzle, it becomes possible to perform false twisting without stretching undrawn yarn. In this case, it is important to consider the structure of the swirl nozzle so that the tension ratio of twisting / untwisting is 0.8 to 1.

FIG. 2 shows an example of the fluid swirling nozzle used in the present invention. In FIG. 2, a compressed fluid is jetted from a fluid introduction hole 10 in a tangential direction of the yarn introduction hole 9 to twist the running yarn. Here, in order to set the twisting / untwisting tension ratio to 0.8 to 1, the fluid introduction hole 10 is provided so as to be substantially perpendicular to the yarn introduction hole 9 and The diameters of the yarn inlet side and the yarn outlet side may be equal or may be tapered from the yarn outlet side to the yarn inlet side. The twisting tension is set to be equal to or slightly lower than the untwisting tension in order to minimize the structural change inside the fiber caused by the difference in tension between the twisting point and the untwisting point of the running yarn. As a result, a yarn having stable dyeing properties without variation can be obtained.

According to the present invention, the undrawn yarn is subjected to false twisting using a fluid swirling nozzle. However, the undrawn yarn has a very easy to elongate property. It is important to set the magnification to 1.0 or less and apply the false twist under tension that does not cause stretching. Therefore, the present invention focuses on the heat shrinkage stress of the undrawn yarn, and finds that if false twisting is performed under a tension equal to or less than the maximum heat shrinkage stress, the undrawn yarn will be crimped without being drawn. Then, this phenomenon is used. In other words, in the present invention, it is an essential condition that the twisting and untwisting tensions should be not more than the maximum heat shrinkage stress of the undrawn yarn, preferably not more than the maximum heat shrinkage stress and not more than 0.06 g / d to perform false twisting. Become. Although the maximum heat shrinkage stress of the undrawn yarn varies depending on the birefringence (Δn) of the yarn, it is approximately 0.05 to 0.1 g / d if the birefringence (Δn) of the undrawn yarn used in the present invention is in the range. d is the stress value. Therefore, if the twisting and untwisting tensions are kept below the above stress values, the undrawn yarn is not drawn and becomes a false twisted crimped yarn, and the dye has a birefringence (Δn) of 130 × 10 ^-3 or less. A deep dyeing yarn having a high exhaustion rate can be obtained.

Further, in the present invention, it is necessary to perform false twisting with a false twist number having a false twist coefficient of 20,000 or less. If the false twist coefficient exceeds 20,000, the twisting action of the fiber due to twisting becomes strong, the structure inside the fiber changes, the orientation proceeds, and the dyeing property is undesirably reduced. Further, even with a low false twist number as in the present invention, the supply yarn is an undrawn yarn, so that the heat setting property is good and the crimp can be sufficiently imparted.

Here, the false twist coefficient is a numerical value calculated by the following equation.

As the heater temperature during false twisting, a temperature within a range that does not cause the undrawn yarn to be fused may be employed, but in order to further improve the crimping characteristics, a higher temperature within the above range is preferable. preferable.

The lofted yarn obtained by the first invention is
The progress of the fiber orientation of the undrawn yarn, which is the supply yarn, is suppressed as much as possible, and the dyeing property is remarkably improved as compared with the conventional draw simultaneous false twisting yarn, and the dyeing effect is excellent. There is no unevenness in physical properties such as adhesion, and the quality is excellent.

Further, the bulky processed yarn obtained in the first invention may be subjected to fluid injection processing (second invention). In the second invention, the fluid injection processing includes interlacing of yarn, entanglement and loop fluff. Any of the Taslan processing for forming

The bulky processed yarn obtained by the second invention has loop fluff and entanglement over the entire yarn, so that irregular internal reflection between the filaments reduces the amount of irregularly reflected light to the outside. A fabric with a significantly improved deep-dyeing effect can be obtained due to a synergistic effect with the deep-dyeing property.
Since the entire yarn has loop fluff and entanglement, voids are formed between the filaments, and a fabric having an appropriate swelling can be obtained.

Further, when performing the fluid injection processing on the bulky processed yarn obtained in the first invention, a yarn having an elongation of 40% or less is introduced into the same fluid injection nozzle, and the two yarns are simultaneously subjected to the fluid injection processing. (Third invention). According to the third invention, since the undrawn yarn is false-twisted at a low tension, the relatively stretched bulky yarn is combined with the low elongation yarn by the fluid jet processing, and therefore, the elongation of the entire yarn is increased. The composite bulky processed yarn having low wool and having loop fluff and entanglement over the entire yarn can be obtained.

As the low elongation yarn used in the above-described fluid jet processing, it is necessary to use a drawn yarn having an elongation of 40% or less or a yarn obtained by ultra-high speed spinning. % Or less may be either raw yarn or processed yarn. If the elongation of the composite yarn exceeds 40%, the entire yarn is easily elongated due to the tension applied during the weaving preparation step or during weaving, and a fabric of stable quality cannot be obtained.

The above-mentioned composite lofted yarn obtained by the third invention is characterized by the features of the lofted yarn obtained by the second invention,
In addition, the false twisted yarn with relatively high elongation is mixed with the low elongation yarn, so that the false twisted yarn is stretched by the tension received during the weaving preparation process and during knitting and weaving. It has the advantage that a stable quality fabric can be obtained without any problem.

The fluid jetting nozzle used in the fluid jetting process in the second and third inventions is not particularly limited. For example, a taslan nozzle or a tangled nozzle which can simultaneously impart tangling with the loop fluff. For example, interlaced nozzles.

The overfeed rate of the yarn at the time of fluid jetting is not particularly limited, but in the case of the third invention,
It is preferable that the overfeed rate of the false twisted yarn is equal to or larger than that of the low elongation yarn from the viewpoint of improving the deep dyeing effect.

[0027] The polyester undrawn yarn used in the present invention is a generic term for polyesters having an ester bond in a molecular chain represented by polyethylene terephthalate, and contains a third component such as isophthalic acid and paraoxyethoxy benzoic acid. Modified polyesters are also included.

Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, an undrawn yarn 1 is supplied to a false twisting region between a supply roller 2 and a take-up roller 5 by a supply roller 2, twisted by a fluid swirling nozzle 4, and heat-set by a heater 3. Next, the yarn that has passed through the first take-off roller 5 is subjected to a fluid ejection process by a fluid ejection nozzle 7, and then wound up into a package 8 through a second take-off roller 6. (2nd invention). In the case of the first invention, the fluid injection nozzle 7 and the second
The process is performed in the same manner as in FIG. 1 except that the take-up roller 6 is not provided, and the yarn that has passed through the first take-up roller 5 is wound up into the package 8.

FIG. 3 is a schematic process diagram showing an embodiment of the third invention. In FIG. 3, the undrawn yarn 1 is
After being supplied to the false twisting region between the supply roller 2 and the take-up roller 5 by the supply roller 2, twisted by the fluid swirling nozzle 4, and heat-set by the heater 3, the first take-up roller 5 enters the fluid treatment region. Be guided. Subsequently, the false-twisted yarn is subjected to fluid ejection processing by the fluid ejection nozzle 7 together with the low-elongation yarn 11 supplied by the supply roller 12 , and then wound around the package 8 via the second take-off roller 6. Taken.

[0030]

Next, the present invention will be described in detail with reference to examples. The L value is a value obtained by measuring the reflectance with a MS-2020 type spectrophotometer manufactured by Matsukubesu Co., Ltd., and obtaining a density index from the color difference formula of CIE lab. It has a deep color.

Examples 1 to 3 and Comparative Example 1 As a supply yarn, a polyethylene terephthalate highly oriented undrawn yarn 110d / 36f having a birefringence (Δn) of 60 × 10 ^-3 was used.
Except that the fluid injection nozzle 7 and the second take-off roller 6 were not passed, a bulky yarn was produced according to the process shown in FIG. The maximum heat shrinkage stress of the supply yarn is 0.09 g / d
Met. The fluid swirling nozzle shown in FIG. 2 was employed.

[0032]

[Table 1]

The bulky yarn obtained above was knitted into a tubular knitted fabric, and then dyed with a black disperse dye, Dianix Black HG-FS (manufactured by Mitsubishi Kasei Co., Ltd.), 15% owf.

Each of the bulky processed yarns obtained in Examples 1 to 3 has a birefringence (Δn) of 100 × 10 ⁻³ or less and an L of a tubular knitted fabric.
The value was low, and a black knitted fabric with moderate swelling and depth was obtained. On the other hand, in Comparative Example 1, the birefringence (Δn) was 150
It was as high as × 10 ^-3 , and the knitted tubular fabric was given bulkiness but had no deep dyeing effect.

Examples 4 to 6 and Comparative Example 2 As the supply yarn, a highly oriented undrawn polyethylene terephthalate yarn 110d / 36f having a birefringence (Δn) of 60 × 10 ⁻³ was used.
According to the process shown in FIG. 1, a bulky processed yarn was produced under the conditions shown in Table 2. The maximum heat shrinkage stress of the supply yarn was 0.09 g / d. The fluid swirling nozzle shown in FIG. 2 was used, and the fluid jet nozzle used was a Taslan type nozzle capable of imparting confounding with loop fluff.

[0036]

[Table 2]

Each of the bulky processed yarns obtained in Examples 4 to 6 has a dense loop fluff and confound on the yarn surface, and has a birefringence (Δn) of 100 × 10 ⁻³ or less. It was low. The obtained bulky yarn is knitted into a tubular knitted fabric, and then a black disperse dye, Dianix Black HG.
-FS (Mitsubishi Kasei Co., Ltd.) 15% owf dyeing process. The tubular knitted fabric had a spun-like feel and a moderate swelling feeling, and had a low L value and was a deep black knitted fabric.

On the other hand, in Comparative Example 2, a bulky yarn having entanglement with loop fluff was obtained, but the birefringence (Δn) was 1
It was as high as 50 × 10 ^-3 , and the knitted tubular fabric was given bulkiness but had no deep dyeing effect.

Examples 7 to 9 and Comparative Example 3 As feed yarns, a polyethylene terephthalate highly oriented undrawn yarn 110d / 36f having a birefringence (Δn) of 60 × 10 ^-3 and a polyethylene terephthalate yarn were used, as shown in FIG. According to the process, a composite bulked yarn was manufactured under the conditions shown in Table 3. The maximum heat shrinkage stress of the supply yarn was 0.09 g / d. The fluid swirling nozzle shown in FIG. 2 was used, and the fluid jet nozzle used was a Taslan type nozzle capable of imparting confounding with loop fluff.

[0040]

[Table 3]

Each of the composite lofted yarns obtained in Examples 7 to 9 has a dense loop fluff and entanglement on the yarn surface, and has a birefringence (Δn) of 100%.
× 10 ^-3 was low. The obtained composite bulky processed yarn was used for warp and weft and woven by WJL. Both of them have good weaving properties, and the yarn may be stretched by the tension applied during the weaving preparation process or during weaving. And a stable quality woven fabric was obtained. Next, the above-mentioned woven fabric is treated with a black disperse dye, Dianix Black HG.
When dyed with FS (manufactured by Mitsubishi Kasei Corporation) at 15% owf, a black fabric having an excellent deep dyeing effect and a moderate swelling feeling was obtained.

On the other hand, in Comparative Example 3, a bulky yarn having entanglement with the loop fluff was obtained, but the birefringence (Δn) was 1
It was as high as 60 × 10 ^-3 and had no deep dyeing effect.

[0043]

As described above, according to the present invention, the degree of orientation of the yarn is reduced by reducing the tension applied to the yarn to the heat shrinkage stress of the undrawn yarn and performing the false twisting without stretching. The progress of the dyeing is suppressed, the dyeing property is improved, and it is possible to stably produce a bulky processed yarn and a composite bulked processed yarn excellent in the deep dyeing effect.

According to the second and third aspects of the present invention, the yarn has a moderate swelling due to loop fluff and entanglement, and the yarn form such as loop fluff and entanglement and the deep dyeing property of the false twisted yarn. It is possible to produce a bulky processed yarn and a composite bulked processed yarn in which the deep dyeing effect is significantly improved by the synergistic effect.

Further, according to the third invention, the false twisted relatively high elongation yarn is mixed with the low elongation yarn to thereby reduce the tension applied during the weaving preparation step and the weaving and weaving operation. It is possible to produce a composite bulky textured yarn having high stability.

[Brief description of the drawings]

FIG. 1 is a schematic process drawing showing one embodiment of the second invention.

FIG. 2 is a longitudinal sectional view showing an example of a fluid swirling nozzle used in the present invention.

FIG. 3 is a schematic process drawing showing one embodiment of the third invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Undrawn yarn 3 Heater 4 Fluid swirl nozzle 7 Fluid ejection nozzle 8 Package

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-210076 (JP, A) JP-A-1-124465 (JP, A) JP-A-58-191235 (JP, A) JP-A-53-191 45418 (JP, A) JP-A-57-25439 (JP, A) JP-A-51-23347 (JP, A) JP-A-55-57027 (JP, A) (58) Fields investigated (Int. ⁶ , DB name) D02G 1/02 D02G 1/16 D02J 1/00-1/22

Claims (3)

(57) [Claims] 1. A birefringence (Δn) of 20 × 10 ⁻³ to 80 × 10 ^−3.
Using a fluid swirling nozzle as a twisted body, a polyester high-orientation undrawn yarn having a false twist coefficient of 20,000 or less, a draw ratio of 1.0 or less, and a twisting / untwisting tension ratio of 0.8 to 1, and A method for producing a bulky processed yarn, wherein false twisting is performed under a tension having a twist or untwisting tension equal to or less than a maximum heat shrinkage stress of the undrawn yarn. 2. A method for producing a bulky processed yarn, comprising subjecting the bulky processed yarn obtained in claim 1 to a fluid jetting process. 3. The bulky yarn obtained in claim 1 and an elongation.
A method for producing a composite bulky processed yarn, comprising combining a multifilament yarn with a polyester multifilament yarn of 40% or less and performing fluid injection processing.