JP2731339B2 - Fusion-bonded 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 fused false twisted yarn having a soft texture and a moderate crispness.

[0002]

2. Description of the Related Art In order to obtain a hemp-like texture, a so-called fusion-bonded yarn in which single-filament filaments are fused together has been known, and many proposals have been made. When the degree of fusion of such a fusion-processed yarn is increased, a remarkable crispness can be obtained, but on the other hand, the texture becomes hard, and it is difficult to balance the two.

Conventionally, it has been known to use so-called ultrafine fibers to soften the texture. To overcome the above-mentioned problem, it is considered that the fusion false twist is performed using ultrafine fibers. Can be However, simply twisting the ultrafine fibers does not allow satisfactory twisting due to the small fineness, so usually after processing the composite fibers using a splittable composite fiber, the splitting is performed. Often done.

For example, Japanese Patent Application Laid-Open No. 56-58066 discloses that a polyethylene terephthalate is not fused to a composite filament comprising polyethylene terephthalate and a copolymerized polyester in a temperature range in which the copolymerized polyester is fused. It is described that after twisting, the copolymerized polyester component is dissolved.

Japanese Patent Application Laid-Open No. 61-239033 discloses that a composite filament having a multileaf rectangular segment composed of a non-eluting component and surrounded by an eluting component is treated at a temperature between the softening point and the melting point of the non-eluting component. It discloses that after performing a low fusion false twisting process, an eluted component is eluted.

[0006]

However, even with the above-mentioned prior art, there are still the following problems. In other words, in Japanese Patent Application Laid-Open No. 56-58066, since polyethylene terephthalate itself is not fused, the fused portion is eluted and disappeared by the dissolution treatment, so that the product has poor crispness. Further, as described in the same publication, when an ordinary drawn yarn is subjected to fusion processing by applying excessive heat, the fiber strength is remarkably reduced, and a product which can withstand practical use cannot be obtained.

Further, in Japanese Patent Application Laid-Open No. 61-239033, fusion of non-elutable components is performed. However, the composite filament disclosed in the publication does not generate many ultrafine fibers. The ultrafine fibers generated are those in which the tip of the multi-leaf segment is broken by the external force in the fusion false twisting step, and can be said to have been generated with the decrease in fiber strength as described above.

[0008] Therefore, in the prior art, it was not possible to obtain a processed yarn made of ultrafine fibers and having a remarkable fused portion and having a strength that can be practically used. The present invention is intended to solve such a problem, and its object is to provide a soft texture caused by the ultrafine fibers and a crisp taste caused by the fused portion, and a strength that can be practically used for clothing. To provide a fused false twisted yarn having

[0009]

SUMMARY OF THE INVENTION The present invention relates to a false twisted multifilament yarn mainly composed of ultrafine filaments having a single-fiber fineness of 0.6 denier or less. A single yarn of 20% or more of the number of single yarn filaments is a fused portion in which the ultrafine filaments are fused to each other,
A fused yarn having an intermittent frequency of 20 points / m or more along the longitudinal direction of the fiber and a breaking strength of 1.5 g / d or more. Is a cross section in which a fiber-forming component and a soluble component having higher solubility than the fiber-forming component are joined and the soluble component divides the fiber-forming component into a plurality of segments such that both components are exposed on the surface. Birefringence having a shape of 40 to 80 × 10 ^-3
The highly oriented undrawn composite fiber filament is subjected to a fusion false twisting process for fusing at least a part of the fiber-forming component, and then the obtained false twisted yarn is subjected to a dissolving treatment to dissolve the soluble component. Is eluted.

[0010] The fused yarn of the present invention is mainly composed of a large number of ultrafine filaments having a single yarn fineness of 0.6 denier or less, preferably 0.4 denier or less, and has a fiber-forming ability. Various materials such as polyester and polyamide can be used,
In particular, polyester represented by polyethylene terephthalate is preferred. However, it is preferable to use the same material because it is difficult to match colors and the management of the process becomes complicated when a plurality of types of materials, particularly different kinds of materials having remarkably different dyeing properties and the like are mixed.

The important points of the fused false twisted yarn of the present invention are that there is a remarkable fused portion as described in detail below, and that the fused false twisted yarn is practically usable despite the presence of such a remarkable fused portion. It has a fiber strength without any problem.

First, the fused portion of the present invention will be described.
FIG. 1 is a schematic cross-sectional view of a fused portion of the fused false twist yarn of the present invention. In the figure, 1,... Indicate extra fine filaments,
The fusion filaments 2,... Are formed by fusing a plurality of the ultrafine filaments 1,. In the cross section, as shown in the figure, 20% or more of the ultrafine filaments forming the fused yarn are fused filaments 2,.
In the present invention, a portion having the following relationship is defined as a fused portion 3. Normally, the fusion-bonded yarn has a fusion portion and a non-fusion portion alternately, that is, has a fusion portion intermittently. It has intermittently at a frequency of 20 places / m or more along the direction. The length of each fused portion 3 is 5
It is preferably about 50 mm.

Next, the fiber properties of the fused yarn of the present invention will be described. Usually, in order to form the above-mentioned fused portion, it is necessary to perform an excessive heat treatment, so that the fiber strength is significantly reduced. On the other hand, the fused yarn of the present invention has a breaking strength of 15 g / d or more.

The fused yarn of the present invention has the above-mentioned structure. However, in actual use, if the texture of the ultrafine filament is not impaired, about 25% by weight or less of other component yarn is mixed and mixed. They may be mixed by twisting or the like.

Next, a method for producing the above-mentioned fused yarn will be described. First, as yarns for performing fusing processing in the present invention method, is as solubility component both components and high solubility component soluble than the fiber-forming component and the fiber-forming component is bonded is exposed to the surface A conjugate fiber having a cross-sectional shape that divides the fiber-forming component into a plurality of segments is used. FIG. 2 shows a specific cross-sectional shape of such a conjugate fiber, in which the fiber-forming component A is divided by a linear soluble component B (a), and the fiber-forming component A is divided by a radial soluble component B ( (B) to (e), the core fiber-forming component A and a plurality of petal-like fiber-forming components A surrounding the core.
And a radial soluble component B located between the petal-like fiber-forming component A (f) and the like. These composite fibers have a single-fiber fineness of 2.0 to 3.5. Denier is preferred. The conjugate fiber is obtained by dissolving and removing the soluble component B by a dissolution treatment described later. For example, when the conjugate fiber shown in FIG. 2 (f) is treated, the fiber forming component A becomes a plurality of fibers as shown in FIG. And the fineness of the fiber after being divided in this manner is 0.1. It should be less than 6 denier.

Further, the fiber-forming component A and the soluble component B
For example, polyester, polyamide, polyolefin and the like can be mainly used, and may be used as a copolymer in order to impart different physical properties.

Examples of such polyesters include homopolyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene oxybenzoate, polydimethylcyclohexane terephthalate, and polypivalolactone, and isophthalic acid, Those obtained by copolymerizing sulfoisophthalic acid and those obtained by copolymerizing polypropylene glycol or polyethylene glycol as the secondary alcohol component can be used.

As the polyamide, nylon 6,
Nylon 66, Nylon 610, Nylon 11, Nylon 12, condensates of bis (paraaminocyclohexyl) methane and dodecane diacid, copolymers of these polyamide-forming components, and other dicarboxylic acids and diamines. Polymerized products and the like can be used.

Further, as the polyolefin, a homopolyolefin such as polyethylene or polypropylene, or a polyolefin containing a small amount of the second component can be used.

In selecting the combination of the two components A and B from these polymers, those having mutual affinity, different solubility, and not causing delamination in each step after spinning, etc. Are preferably used in combination. For this reason, it is common to use a combination of two polymers that are usually of the same series and have relatively close melting temperatures.
There are methods such as changing the degree of polymerization of each component A and B, changing the presence or absence of copolymerization, or changing the ratio thereof.

Specifically, as such a combination,
For example, a combination of polyethylene terephthalate and polyethylene terephthalate obtained by copolymerizing about 2.5 mol% of sulfoisophthalic acid; polyethylene terephthalate and a block polyether polyester obtained by copolymerizing polyethylene terephthalate component with polyethylene glycol of about 5 mol% A combination of polyethylene terephthalate and a block polyether polyester obtained by copolymerizing about 2.5 mol% of sulfoisophthalic acid and about 10% by weight of polyethylene glycol; nylon 6 and nylon 66 as a component forming nylon 66;
A combination with a copolyamide in which the components are copolymerized by 10%; a combination with polypropylene and a different viscosity polypropylene can be used.

Next, what is important for the method of the present invention is that
The use of such a conjugate fiber as a so-called highly oriented undrawn yarn (POY) having a birefringence of 40 to 80 × 10 ⁻³ ,
Such a highly oriented undrawn yarn usually comprises 25 spun yarns.
It can be obtained by winding up at about 00 to 3500 m / min.

[0023] Such a highly oriented undrawn composite fiber filament is subjected to a fusion false twisting process as described below. First, it is necessary to perform the fusion false twisting process at a temperature at which fusion occurs to at least a part of the fiber-forming component of the composite fiber filament. Generally, a polymer having a high solubility tends to have a low melting point, and in the case of the above-described conjugate fiber, when the treatment temperature is increased, the soluble component often fuses first. In the case of the method of the present invention, the treatment is carried out at a temperature exceeding such a temperature and further causing fusion to the fiber-forming component. For example, in the case of a composite fiber in which a copolymerized polyester obtained by copolymerizing polyethylene terephthalate with sulfoisophthalic acid or polyethylene glycol is combined with polyethylene terephthalate, 220 to 250
It is preferred to process at a temperature of ° C. However, 240 ° C
If the processing is performed beyond the range, the fiber strength may be significantly reduced.

In the method of the present invention, since a highly oriented undrawn yarn is used, it is preferable to perform draw false twisting, and the draw ratio is preferably 1.2 to 1.5. Regarding other false twist processing conditions, generally, when a friction type false twist apparatus is used, the processing speed is 200 to 600 m / mi.
Processing may be performed in about n.

Further, the fusion false twisting may be performed on a plurality of yarns having different physical properties besides processing on a single yarn. For example, a plurality of yarns having different elongations may be processed. If processing is performed on the yarns, each yarn becomes a so-called composite processed yarn in which the respective yarns are arranged in a core-sheath shape. If the composite fiber filament is used as the high elongation yarn, the ultrafine filament is located at the sheath portion after dissolution division. The obtained composite processed yarn gives an elegant hemp-like texture with a mild shari taste. On the other hand, if the above-mentioned composite fiber filament is used as the low elongation yarn, the ultrafine filament becomes a composite processed yarn located at the core, and a fine airy taste is obtained, and the hardness of the fused portion present in the sheath is reduced by the core. The part is reduced by the extra-fine filament, and a moderate crispness is obtained. In this case, using a yarn having a birefringence of 40 to 80 × 10 ⁻³ as a high elongation yarn composed of a composite fiber filament and 25 to 60 × 10 ⁻³ as a low elongation yarn, the elongation difference between both yarns is reduced. 6
It is preferred to be 0% or more. Also, it is preferable to use thick and thin yarn as the low elongation yarn.

FIG. 4 is a schematic view showing an example of the manufacturing process of such a composite processed yarn. The high elongation yarn H and the low elongation yarn L drawn out of the package are aligned and ligated.
The entanglement process is performed by an interlace nozzle 42 through a tension adjusting device 41, and the entangled process is supplied to a false twist zone by a feed roller 43. In the false twisting zone, the false twist is passed through a heater 44 and a false twisting tool 45 by a delivery roller 46 and wound around a cheese 47.

The fusible false twisted yarn obtained as described above is used to form a woven or knitted fabric, etc., and then subjected to a dissolution treatment to elute the soluble component, thereby generating ultrafine filaments. . In the dissolution treatment, in the case of a copolymerized polyester obtained by copolymerizing polyethylene terephthalate with sulfoisophthalic acid or polyethylene glycol, it can be easily dissolved and removed by an alkali component such as caustic soda. Further, when a woven or knitted product, only the fused false twisted yarn of the present invention may be used, but other yarns may be mixed,
For example, cross-weaving with mixed fiber composite yarn, false twisted yarn, raw yarn, thick and thin yarn and the like can be mentioned.

[0028]

【Example】

Example 1 Intrinsic viscosity η (a mixed solvent of phenol and tetrachloroethane (phenol:
(Measured in tetrachloroethane = 6: 4) at 20 ° C.) is 0.640 (polyethylene terephthalate (semi-dal)), and as a soluble component, 2.5 mol% of sulfoisophthalic acid and 10 mol of polyethylene glycol are added to the polyethylene terephthalate fiber-forming component. The two types of polymers A and B are separately melted using a block polyether polyester (semi-dal) having an intrinsic viscosity η of 0.58 copolymerized by weight%, and a bonding ratio of 3: 1 is obtained using a composite spinneret pack.
In a composite state.

Then, the two types of polymers A and B in the composite state are spun through a spinning hole provided in the spinneret pack at a spinning temperature of 295 ° C., and are taken off at a take-up speed of 3200 m / min. 115 denier / 2
In a highly oriented undrawn state of five filaments, a composite fiber filament having a birefringence of 45 × 10 ⁻³ and an elongation of 120% having a cross-sectional shape as shown in FIG. 2F was obtained. Next, the composite fiber filament was heated as shown in Table 1 under the conditions of a draw ratio of 1.399 times, a passing time of the false twist heater of 0.43 sec., A yarn speed of 350 m / min., And a speed ratio (D / Y) of 2.012. False twisting was performed by changing the temperature to produce a fused false twisted yarn.
In this case, a circumscribed friction false twisting tool was used as the false twisting tool, the number of disks was 7, and the K value was 0.85.

Further, a plain fabric is manufactured by using the obtained fused false twisted yarn as a warp yarn without twisting, and the plain fabric is immersed in a 1% caustic soda solution at a bath ratio of 1:50 and heated to 98 ° C. × 15. The soluble component was eluted by performing the treatment for 1 minute. (Weight loss 21%). The obtained plain woven fabric has a warp and weft density of 110 yarns / inch × 90.
Book / inch and had a soft, sharp feel as a summer women's blouse material. When the cross section of the plain fabric was observed under an electron microscope at 1500 times, the composite fiber filament was divided into a core segment of 0.8 denier and a sheath segment of 0.25 denier. It had a fused part and fiber strength.

[0031]

[Table 1]

(Example 2) The birefringence of the composite fiber filament used in Example 1 and the 145 denier / 24 filament drawn at a drawing speed of 2500 m / min was 35 × 10 ^-3 and the elongation was 180%. The highly oriented undrawn polyethylene terephthalate yarn was subjected to composite false twisting according to the process shown in FIG. That is, after both yarns are aligned and combined, the draw ratio is 1.399 times and the passing time of the false twist heater is 0.
43 sec., Yarn speed 350 m / min., Speed ratio (D / Y)
Under the conditions of No. 012, the false twisting was performed by changing the heater temperature as shown in Table 2 to produce a fused false twisted yarn. In this case, a circumscribed friction false twisting tool was used as the false twisting tool, and the number of disks was 1
0 sheets and the K value was 0.45.

Further, a single jersey was knitted by a single circular knitting machine (28G) using a single-layer knitting machine (28G) using the obtained fused false twisted yarn without twisting, and the circular knitted product was put into a 1% caustic soda solution at a bath ratio of 1: Soaking was performed at 98 ° C. for 15 minutes by immersion at 50 to elute soluble components. (Weight loss rate 11%)

The obtained circular knitted fabric has an airy feeling obtained from microfibers present in the core of the fused false twist yarn,
It was suitable as a material for shirts and blouses for women's summer with matching hemp tone shari taste obtained from the low count yarn present in the sheath. When the cross section of the plain fabric was observed under an electron microscope at a magnification of 1500 times, the composite fiber filament was divided into a core segment of 0.75 denier and a sheath segment of 0.25 denier. It had a fused part and fiber strength.

[0035]

[Table 2]

Example 3 Using the polymer and composite spinneret pack used in Example 1, a take-up speed of 2000
Winding at m / min, 140d / 25f, birefringence 4
0 × 10 ^-3 , a composite fiber filament having an elongation of 180%;
Winding at a take-up speed of 3300 m / min, 120 d
/ 24f, a birefringent index of 55 × 10 ⁻³ , and an elongation of 120% were obtained.

Next, in the step shown in FIG. 4, the draw ratio is 1.399 times, the temperature of the false twist heater is 240 ° C., the passing time of the false twist heater is 0.43 seconds, the yarn speed is 350 m / min, and the speed ratio (D
/ Y) At 2.204, the same composite false twisting was performed using the same false twisting tool as in Example 2. An Ox structure is woven by applying an additional twist of 1000 T / M in S-twist using the obtained fused composite false-twisted yarn, and an elution treatment is performed under the same conditions as in Example 2 to obtain a weight loss rate of 2
A woven fabric having 0% warp and weft density of 115 yarns / inch × 65 yarns / inch was obtained. The woven fabric was an elegant linen woven fabric having a feeling of tightness obtained from a low-count yarn existing in the core of the fused false twisted yarn and a mild crispness obtained from microfibers present in the sheath. .

When the cross section of the plain fabric was observed under an electron microscope at a magnification of 1500 times, the composite fiber filament was divided into a core segment of 0.75 denier and a sheath segment of 0.25 denier.

[0039]

The fused yarn of the present invention has a sharp feeling due to the presence of a remarkable fused portion, but has a soft hand at the same time because it is mainly composed of ultrafine filaments. Therefore, the fabric using the fusion-bonded yarn of the present invention has a mild crispness and a unique texture of satin touch. In addition, the fused yarn of the present invention has a practically no problem while having the fused portion as described above,
Can be used for a wide range of applications. Further, according to the method of the present invention, it is possible to stably produce the above-mentioned fused yarn.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a fused portion of a fused false twist yarn of the present invention.

FIG. 2 is a schematic view showing a cross-sectional shape of a conjugate fiber used in the method of the present invention.

FIG. 3 is an explanatory view showing a state after division of the conjugate fiber of FIG. 2 (f).

FIG. 4 is a schematic view showing a production process of a composite textured yarn according to the method of the present invention.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI Technical display location D06M 11/38 D06M 5/02 Z // D06M 101: 32 Examiner Masato Matsunawa (56) References JP 61 JP-A-239033 (JP, A) JP-A-56-58066 (JP, A) JP-A-54-82458 (JP, A)

Claims (2)

(57) [Claims] 1. A false twisted multifilament yarn mainly composed of ultrafine filaments having a single yarn fineness of 0.6 denier or less, wherein the number of the single yarn filaments constituting the false twisted multifilament yarn in the cross section is 20%. The above-mentioned single yarn is formed by fusing a fused filament in which the ultrafine filaments are fused to each other along the longitudinal direction of the fiber.
A fused yarn having intermittent frequency of not less than parts / m and breaking strength of not less than 1.5 g / d. 2. A fiber-forming component and a soluble component having a higher solubility than the fiber-forming component are joined, and the soluble component divides the fiber-forming component into a plurality of segments so that both components are exposed on the surface. Birefringence of 40 to 8 having a transverse cross-sectional shape
After subjecting the highly oriented unstretched composite fiber filament of 0 × 10 ⁻³ to fusion false twisting for fusing at least a part of the fiber-forming component, the resulting false twisted yarn is subjected to a dissolution treatment. A method for producing a fused yarn, wherein the soluble component is eluted upon application.