JP3502715B2 - Method for producing composite bulky yarn - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
The present invention relates to a method for producing a composite bulked yarn having a moderate swelling and suitable as a yarn for a woven or knitted fabric. 2. Description of the Related Art After spinning at a normal speed, a method of drawing at a low draw ratio or obtaining a false twisted yarn from a polyester highly oriented undrawn yarn obtained by high-speed spinning is generally performed by simultaneous drawing. A false twisting method is employed. The false twisted yarn obtained by the simultaneous drawing and twisting method is not inferior to the false twisted yarn obtained from a general drawn yarn in both crimping properties 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. [0004] For this reason, when simultaneously drawing and untwisting undrawn yarn, a method of performing false twisting with a draw ratio as low as possible to suppress the degree of orientation of the yarn and enhance the deep dyeing effect has been attempted. . However, when the draw ratio is reduced, the normal pin type false twisting method causes thread breakage due to ballooning, and the friction type deteriorates twisting efficiency due to low tension, resulting in poor operating efficiency. It is difficult at present. Therefore, a method of false twisting using a fluid swirl nozzle has been proposed as a twisted body instead of the pin type or the friction type. For example, Japanese Patent Publication No. 59-34
No. 810 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 aiming at energy saving and speeding up. Since the false twisting process is performed under the draw ratio,
Although the yarn after false twisting, that is, the yarn at the time of primary drawing, can be expected to have a strong dyeing effect, the twisting tension and untwisting tension are greatly different due to the structure of the twisted body. There is a drawback in that unevenness in stretching tends to occur inside, and it is not possible to manufacture a yarn with stable quality. [0008] There have also been proposed a number of methods for subjecting a processed yarn obtained by subjecting a highly oriented polyester unoriented yarn to simultaneous simultaneous false twisting to fluid injection treatment. [0009] Since the processed yarn obtained by these methods has entanglement and loop fluff, the convergence is improved and the unwinding property from the wound body is improved, and spun-like swelling is obtained, but the density is high. There was a problem that there was no dyeing effect. SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, has an excellent deep-dyeing effect, has a moderate swelling, and is suitable for use as a yarn for woven or knitted fabric. An object of the present invention is to provide a method for stably producing a processed yarn at high speed and at low cost. Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have used two highly oriented undrawn yarns and used one highly oriented undrawn yarn. When the false twist crimping is performed at a draw ratio equal to or lower than the natural draw ratio, the degree of orientation of the yarn is suppressed, and a bulky processed yarn having high dyeing properties can be obtained. It was discovered that if high-speed fluid injection treatment was performed together with the drawn yarn, it would be possible to stably produce a composite bulked yarn having a deep dyeing effect and appropriate swelling and excellent high-order workability. The invention has been reached. That is, the present invention uses two polyester highly oriented undrawn yarns having a birefringence (Δn) of 20 × 10 ⁻³ to 80 × 10 ⁻³ as one of the supply yarns. Using a fluid swirl nozzle as the twisted body,
With a draw ratio of 20000 or less, a natural draw ratio or less, and a non-contact heater with a heater temperature of + 50 ° C or higher, a false twist crimping process is performed to form a bulky processed yarn. , Hot drawn at a draw ratio such that the elongation after drawing is 40% or less to form a drawn yarn.
500m / min after combining the drawn yarn and the bulky yarn
The gist of the present invention is a method for producing a composite bulked yarn characterized by performing the above-mentioned fluid jetting at a high speed. Hereinafter, the present invention will be described in detail. In the present invention, first, one polyester highly oriented unstretched yarn (hereinafter simply referred to as unstretched yarn) is subjected to false twist crimping at a draw ratio equal to or lower than the natural draw ratio to obtain a bulky textured yarn excellent in deep dyeing effect. And For this reason, it is necessary to use an undrawn yarn having a birefringence (Δn) of 20 × 10 ⁻³ to 80 × 10 ⁻³ as a yarn to be supplied to the false twisting step, and in particular, 40 × 10 3 ^-3 to 70 × 10 ^-3 is preferred. If the birefringence (Δn) is less than 20 × 10 ⁻³ , the material will be melted during false twist crimping, and the physical properties will change over time, resulting in quality variations. In addition, the birefringence index (Δ
If n) exceeds 80 × 10 ⁻³ , the deep dyeing effect aimed at by the present invention cannot be obtained. Next, as for the false twisting conditions, it is necessary to perform a false twist crimping process on the undrawn yarn at a natural draw ratio or less, that is, without drawing the undrawn yarn as much as possible. It is preferable to perform false twist crimping. If the undrawn yarn is subjected to simultaneous false twisting at a draw ratio exceeding the natural draw ratio, the fiber orientation advances, the birefringence (Δn) increases, the dyeing properties decrease, and the deep dyeing effect is significantly impaired. Not preferred. Therefore, in the present invention, instead of the above-described pin-type or friction-type false twisting method, a fluid is used as a twisted body as a means for applying untwisted yarn to a false twist crimping at a natural stretching ratio or less. It is necessary to use a fluid swirl nozzle. By using this fluid swirling nozzle, it becomes possible to perform false twist crimping without stretching undrawn yarn. In this case, it is important to consider the structure of the swirl nozzle so that the twisting tension and the untwisting tension are substantially equal. FIG. 2 shows an example of the fluid swirling nozzle used in the present invention. In FIG. 2, a compressed fluid is ejected from the fluid introduction hole 14 in the tangential direction of the yarn introduction hole 13 to twist the running yarn. Here, in order to make the above twisting tension and untwisting tension substantially equal, the fluid introduction hole 14 is provided so as to be substantially perpendicular to the yarn introduction hole 13, and the yarn of the yarn introduction hole 13 is formed. The diameters of the 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 reason why the twisting tension and the untwisting tension are set substantially equal is to minimize the structural change inside the fiber caused by the tension difference between the twisting point and the untwisting point of the running yarn. ,
A processed yarn having stable dyeing properties without variation can be obtained. In the present invention, the undrawn yarn is subjected to false twist crimping using a fluid swirling nozzle. However, the undrawn yarn has a very easy to elongate property. It is necessary to set the stretching ratio of the natural stretching ratio or less. As described above, when the false twist crimping is performed at a draw ratio equal to or less than the natural draw ratio of the undrawn yarn, the birefringence (Δn) becomes 130 × 10
^{When the value is -3} or less, a deep dyeing property with a high dye exhaustion rate can be obtained, and a bulky processed yarn having false twist crimp can be obtained. In the present invention, the number of false twists at the time of the false twist crimping is a false twist coefficient of 20000 or less, preferably 12000 or less.
It is necessary to adopt the following number of false twists. If the false twist coefficient exceeds 20,000, the twisting action of the fiber by twisting becomes strong, the structure inside the fiber changes, the orientation proceeds, and the dyeing property is undesirably reduced. Further, even if the false twist coefficient is low as described above, since the supply yarn is an undrawn yarn, the heat setting property is good, and the crimp can be sufficiently imparted. In the present invention, the false twist coefficient is a numerical value calculated by the following equation. K = T × D ^1/2 where K: false twist coefficient T: false twist number (T / M) D: fineness of feed yarn (denier) In addition, heaters used in false twist crimping are particularly limited. Instead, any heater that is compatible with high-speed false twisting may be used. However, in consideration of the heater length, the heater temperature, and the like, it is important to heat-treat at a high temperature instantly using a non-contact heater. In this case, the heater temperature is set at a yarn speed of 500 m / min or more.
It is necessary to be higher than or equal to ° C. In order to enhance the crimping property and the deep-dyeing effect, it is preferable to use a high temperature within a range that does not cause fusion. If the heater temperature is lower than the melting point + 50 ° C, the heat receiving effect becomes insufficient, and the difference in heat reception between the core layer portion and the sheath layer portion of the yarn becomes small, so that the crimping decreases and the deep dyeing effect becomes poor, which is not preferable. In the bulky processed yarn obtained by the above false twist crimping, the undrawn yarn, which is the supply yarn, is instantaneously heat-treated at a high temperature above the melting point, so that the progress of orientation is suppressed as much as possible, and Is remarkably improved as compared with the conventional draw simultaneous false twisting yarn, resulting in an excellent deep dyeing effect, and no unevenness in physical properties such as dyeing property. However, since the bulky yarn has a relatively high elongation, the yarn alone is easily stretched by the tension received in a subsequent step, and the yarn becomes unstable in quality. Therefore, in the present invention, the yarn is blended with other drawn yarns in the fluid jetting process described later to form a yarn having excellent high-order workability and stable quality. In the present invention, as the yarn to be combined with the above-mentioned bulky processed yarn, a hot drawing treatment is performed using an undrawn yarn similar to the undrawn yarn for the bulky processed yarn, and the elongation is reduced to 40% or less. The drawn yarn is used. In the hot drawing of the undrawn yarn, it is preferable to use a non-contact heater suitable for high-speed processing as in the false twist crimping. With a contact-type normal heater (heater length: 1 m, heater temperature: 250 ° C), the heat-receiving effect on the yarn is low even when hot stretching is performed by high-speed processing. Even if a low elongation yarn is obtained, the heat shrinkage rate is low. However, it is not preferable because the filament tends to be broken due to excessive stretching tension. Therefore, in the present invention, it is preferable to use a non-contact heater and perform a hot drawing treatment at a draw ratio at which the elongation after hot drawing is 40% or less to obtain a drawn yarn having a low elongation and a low heat shrinkage. If the elongation after stretching exceeds 40%, the entire yarn is easily stretched due to the tension received during the weaving preparation process and during weaving, and the quality is stable even when the fluid injection processing is performed in combination with the bulky textured yarn. Fabric cannot be obtained. Next, in the present invention, the bulky processed yarn obtained by false twist crimping and the drawn yarn obtained by hot drawing are subjected to fluid jetting at a high speed of 500 m / min or more to obtain a composite bulked yarn. It is a processed yarn. As the fluid injection processing, any of interlacing for interlacing yarns and taslan processing for forming interlacing and loop fluff may be employed. Therefore, for a fluid injection nozzle used in fluid injection processing, 500 m / mi
For example, it is possible to use a Taslan nozzle that can be applied to the high-speed fluid processing of n or more, for example, a tuslan nozzle that can simultaneously impart loop fluff and entanglement, and an interlace nozzle that can impart only entanglement. The feed rate of the yarn during the above-mentioned fluid jet processing is not particularly limited. However, in order to effectively exhibit the deep dyeing effect of the bulky processed yarn in the composite bulked processed yarn, the feed rate of the bulked processed yarn must be increased. It is preferable to make the supply rate larger than the yarn supply rate. According to the present invention, as described above, a bulky processed yarn obtained by subjecting an undrawn yarn to high-speed false twisting under specified conditions, and a drawn yarn obtained by subjecting the other undrawn yarn to heat drawing under specified conditions. By performing the fluid jetting process with the combined yarns, a composite bulky processed yarn having an excellent deep dyeing effect can be manufactured in a series of continuous steps. And when this undrawn yarn is false twisted at high speed,
By using a non-contact heater and performing heat treatment at a temperature higher than the melting point and instantaneously in a swirling state, a bulky processed yarn excellent in deep dyeing properties can be obtained because the surface and inner layer of the single filament It is recognized that a structural difference occurs between the dyes and the dye exhaustion rate increases. The present invention, as described above, produces a composite bulked yarn in a series of continuous steps. However, since undrawn yarn is used as a supply yarn, the cost of the original yarn is kept low, and high speed is achieved. Since it can be manufactured, there is an advantage that the processing cost can be reduced and the total cost can be significantly reduced. The characteristics of the composite bulked yarn obtained by the present invention are as follows. Since the entire yarn has loop fluff and entanglement, complicated internal refraction between filaments reduces the amount of regular reflected light to the outside. It is possible to obtain a fabric having a significantly improved dyeing effect. 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. [0032] Since the false twisted bulky processed yarn having a relatively high elongation is mixed with the drawn yarn having a low elongation, the bulky processed yarn may be stretched by the tension applied during the weaving preparation process or during the knitting and weaving. And a fabric of stable quality can be obtained. The polyester constituting the undrawn yarn used in the present invention is a generic name of a polyester having an ester bond in a molecular chain typified by polyethylene terephthalate (PET), such as isophthalic acid and paraoxyethoxy benzoic acid. Modified polyesters containing the third component are also included. As described above, the present invention provides a birefringence (Δ
n) a bulky processed yarn obtained by false twisting and crimping an undrawn yarn of 20 × 10 ⁻³ to 80 × 10 ⁻³ under specific conditions, and a drawn yarn obtained by hot drawing the above undrawn yarn. Although the fluid injection processing is performed, a plurality of undrawn yarns may be used as the supply yarns for the bulky processed yarn or the drawn yarn. Next, the present invention will be described with reference to the drawings. FIG. 1 is a schematic process diagram showing one embodiment of the present invention. In FIG. 1, an undrawn yarn 1 is supplied by a supply roller 2 to a false twisting region between a supply roller 2 and a first take-off roller 5. Supplied,
While being twisted by the fluid swirling nozzle 4, it is heat-set by the non-contact heater 3 to form a bulky processed yarn, which is guided to the fluid processing area by the first take-off roller 5. On the other hand, the undrawn yarn 6 is supplied by the supply roller 7 to a heat drawing area between the supply roller 7 and the first take-off roller 9, and is subjected to a heat drawing process by the heater 8 to become a drawn yarn, and the first take-up yarn is obtained. It is guided to the fluid treatment area by the rollers 9. Subsequently, the bulky processed yarn that has been false-twisted and crimped is subjected to fluid injection processing by the fluid injection nozzle 11 together with the drawn yarn that has been subjected to the hot drawing to become the target composite bulked processed yarn.
After passing through 10, it is wound up in a package 12. Next, the present invention will be described specifically with reference to examples. Note that the L value is a value obtained by measuring the reflectance with a MS-2020 type spectrophotometer manufactured by Markbeth and obtaining a density index from the color difference equation of CIE lab. It becomes a color with. Examples 1, 2 and Comparative Example 1 As a supply yarn for a bulky processed yarn, the birefringence (Δn) was 55 ×.
A ^10-3 PET highly oriented undrawn yarn 110d / 72f is used, and the birefringence (Δn) is 60 × 10
^Using a PET highly oriented undrawn yarn 80d / 24f- ³ according to the process shown in FIG. 1, a composite bulked yarn was produced under the conditions shown in Table 1. The undrawn yarn of 110d / 72f has a natural drawing ratio of 1.
It was 3. 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 the loop fluff. [Table 1] Each of the composite bulked yarns obtained in Examples 1 and 2 has a dense loop fluff and entanglement on the yarn surface, and the bulky processed yarn after false twist crimping has a birefringence. The rate (Δn) was as low as 110 × 10 ⁻³ . The obtained composite bulked yarn was used for warp and weft and woven in a water jet loom. Both yarns had good weaving properties, and the yarn was formed by the weaving preparation process and the tension applied during weaving. A woven fabric of stable quality was obtained without being stretched. Next, the above-mentioned woven fabric was treated with a black disperse dye, Dianix Black HG-FS (manufactured by Mitsubishi Chemical Corporation) 15
When dyed with% owf, a black fabric having excellent deep dyeing effect and moderate swelling was obtained. on the other hand,
In Comparative Example 1, although a composite bulked yarn having entanglement with loop fluff was obtained, the birefringence (Δn) was as high as 160 × 10 ^−3, and there was no deep dyeing effect. According to the present invention, since the false twist crimping is performed at a draw ratio equal to or less than the natural draw ratio of the undrawn yarn, the progress of the orientation is suppressed, the dyeing property is improved, and the density is improved. A bulky yarn excellent in dyeing effect can be stably manufactured. Since the bulky yarn and the drawn yarn are subjected to fluid jet processing, the yarn has a moderate swelling due to loop fluff or entanglement, and the yarn form of the loop fluff or entanglement and the deep dyeing property of the bulky yarn. By the synergistic effect, it is possible to obtain a composite bulked yarn in which the deep dyeing effect is significantly improved. Furthermore, since the bulky yarn having a relatively high elongation, which has been false-twisted and crimped as described above, and the drawn yarn which has been hot-drawn are mixed, the stability against the tension applied during the weaving preparation process and during weaving is obtained. It is possible to produce a high-complexity bulky yarn at high speed and at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic process drawing showing one embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing an example of a fluid swirling nozzle used in the present invention. [Description of Signs] 1, 6 Undrawn yarn 3 Non-contact heater 4 Fluid swirl nozzle 8 Heater 11 Fluid ejection nozzle 12 Package

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification code FI D02J 1/22 D02J 1/22 Z (56) References JP-A-4-214431 (JP, A) JP-A-2-269821 ( JP, A) JP-A-5-209337 (JP, A) JP-A-61-21982 (JP, A) JP-A-3-27143 (JP, A) JP-A-63-165550 (JP, A) JP Hei 4-73231 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D02J 1/00-1/22 D01F 6/62 D02G 1/00-1/20

Claims (1)

(57) [Claims] [Claim 1] A birefringent index (Δn) is 20 × 10 as a supply yarn.
^-3 to 80 × 10 ^-3 polyester highly oriented undrawn yarns, one of the polyester highly oriented undrawn yarns was used as a twisted body using a fluid swirl nozzle, with a false twist coefficient of 20000 or less and a draw ratio of Using a non-contact heater with a natural drawing ratio or less and using a non-contact heater at a melting point of + 50 ° C or higher, a false twist crimping process is performed to form a bulky processed yarn, and the other polyester highly oriented undrawn yarn has an elongation after drawing. The drawn yarn is subjected to a hot drawing process at a draw ratio of 40% or less to form a drawn yarn. Subsequently, the drawn yarn and the bulky processed yarn are combined and subjected to fluid jet processing at a high speed of 500 m / min or more. A method for producing a composite bulked yarn.