JP2958297B2 - Manufacturing method of textile products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The first and second aspects of the present invention are directed to the production of a polyester mixed yarn comprising a group of heat-extended yarns (A ') and a group of heat-shrinkable yarns (B') utilizing direct spinning and drawing of polyester. It is about the method. Also, the third and fourth inventions are directed to the production of a fabric comprising polyester mixed yarns of a group of heat-extended yarns (A ') and a group of heat-shrinkable yarns (B'), which also use the direct spinning and drawing method of polyester. It is about the method.

[0002]

2. Description of the Related Art Conventionally, polyester mixed yarns using a filament yarn having a low heat shrinkage and a filament yarn having a high heat shrinkage have been obtained by heat treatment after forming this into a fabric, which is soft and swells. It is used as a material for clothing in general, especially for women's clothing, because it has a natural texture.

[0003] In order to obtain a fabric having a more excellent swelling and a soft texture, a mixed fiber yarn having a larger difference in heat shrinkage between a low shrinkage filament yarn and a high shrinkage filament yarn has been required. For example, a polyester mixed yarn obtained by mixing drawn yarns having different boiling water shrinkage rates is known. However, the method for producing a mixed fiber using stretched yarns having different boiling water shrinkage ratios is such that the unstretched yarn of polyester is once wound up and then stretched under different stretching conditions, whereby the difference in boiling water shrinkage ratios is increased. In this method, the drawn yarns having different shrinkage rates in the boiling water are mixed and then subjected to a fiber-mixing process, so that the manufacturing process is complicated and the manufacturing cost is increased.

[0004] For this reason, various methods have been proposed for obtaining a mixed fiber having a difference in boiling water shrinkage without once winding an undrawn polyester yarn. For example, when the polyester is melt-discharged from a spinneret and cooled to form a yarn, and then the heating and drawing is performed using two heating cylinders arranged in parallel, the outlet of one of the heating cylinders is released. By performing the heating and stretching, that is, by performing the heating and stretching treatment with different heating conditions in the two heating cylinders arranged in parallel,
A method of obtaining a polyester mixed fiber having a high shrinkage component having a boiling water shrinkage of 35 to 75% has been proposed (JP-A-6-173).
No. 2).

Similarly to the above, when polyester is melt-discharged from a spinneret and cooled to form a yarn, then when heating and drawing using two heating cylinders arranged in parallel, Before heating and stretching by these heating cylinders,
By applying water in advance to only one of the filament groups, that is, performing a stretching process under different stretching conditions using two heating tubes arranged in parallel, the heat shrinkage ratio of the high shrinkage component is higher. A method of obtaining a polyester mixed fiber has been proposed (JP-A-7-243144).

However, any of the above-mentioned methods for producing a polyester mixed fiber yarn obtains a polyester mixed fiber yarn having a higher heat shrinkage ratio of a high shrinkage component, and thereby a high shrinkage due to heat treatment after forming a fabric. This is to increase the heat shrinkage of the component to cause swelling. Therefore, if a heat treatment is performed on a cloth made of these polyester mixed yarns to make a swelling cloth, the whole cloth shrinks, which is contrary to the intention to make a soft-textured cloth. Have a tendency to be hard.

[0007] Further, as a method for producing a mixed fiber which makes softness and swelling obtained by heat treatment after forming a fabric more preferable, a spontaneously elongated yarn and a heat shrinkable yarn having a boiling water shrinkage of 0% or less are used. It is known that a method for producing a mixed fiber is known, in which the polyester is melted and discharged from a spinneret, cooled, and formed into a yarn. Since the spontaneously extensible yarn obtained by expressing spontaneous elongation through fiber is subjected to a fiber blending process with another heat-shrinkable yarn, the production process is complicated as described above, and the production cost rises There are drawbacks.

[0008]

Accordingly, the first and second embodiments of the present invention will be described.
The object of the invention of the present invention is to use a polyester mixed fiber yarn which has a soft texture by a subsequent heat treatment and expresses a good swelling without taking complicated steps, that is, a heat-extended yarn group (A ') and a heat-shrinkable yarn group ( And a method for easily and stably obtaining a polyester mixed fiber according to B ′).

Another object of the third and fourth aspects of the present invention is to provide a heat-expandable yarn group (that is, a fabric which has a soft texture and good swelling by a subsequent heat treatment without taking complicated steps). An object of the present invention is to provide a method for easily and stably obtaining a fabric composed of a polyester mixed yarn comprising A ′) and a heat shrinkable yarn group (B ′).

[0010]

The above-mentioned objects are attained by the method for producing a fiber product according to each of the first to fourth inventions having the following constitution.

That is, in the method for producing a fiber product according to the first aspect of the present invention, the extended yarn group (A) for melting and discharging the extended yarn group (A) is provided.
Of the polyester from the spinneret for the extended yarn group (A) by a spinning apparatus provided with a spinneret for the extended yarn group (A) and a spinneret for the contracted yarn group (B) for melting and discharging the contracted yarn group (B). ), The discharge amount Q (B) of the polyester from the spinneret for the shrinkable yarn group (B), and the discharge amount Qf of the polyester per nozzle hole of the spinneret for the elongate yarn group (A).
(A) (g / min) was adjusted so that the following formulas (1) and (2) were satisfied, and polyester was discharged from each spinneret and cooled to form a yarn. After heating and stretching only the shrinkable yarn group (B), the stretched yarn group (A)
After the yarn is shrunk with the shrinkable yarn group (B), the spinning speed V (m / m
Min) = 2,500 to 4000 to form a mixed fiber of a stretched yarn group (A) composed of undrawn yarn and a shrinkable yarn group (B) composed of directly spun drawn yarn, and thereafter, the mixed fiber is By subjecting the polyester to a constant-length heat treatment under heating at a temperature equal to or higher than the glass transition temperature of the polyester and equal to or lower than 120 ° C., a method of obtaining a polyester mixed fiber yarn composed of the heat-extended yarn group (A ′) and the heat-shrinkable yarn group (B ′).

Q (A) / Q (B) ≧ 1 (1) 5 V / (3. 0 × 10 ⁴ ) ≦ Qf (A) ≦ 0.833V / (1.5 × 10 ³ ) (2)

[0013] The method for producing a fiber product according to the second aspect of the present invention is the means for combining the elongated yarn group (A) and the shrinkable yarn group (B) in the method for producing a fiber product according to the first aspect. Is a method using a fluid entanglement process.

[0014] The method for producing a fiber product according to the third aspect of the present invention comprises:
A spinning device provided with a spinneret for a stretched yarn group (A) that melts and discharges the stretched yarn group (A) and a spinneret for a contraction yarn group (B) that melts and discharges a contraction yarn group (B). Amount of polyester discharged from spinneret for
(A), the discharge amount Q (B) of the polyester from the spinneret for the shrinkable yarn group (B), and the discharge amount Qf of the polyester per nozzle hole of the spinneret for the elongate yarn group (A).
(A) (g / min) was adjusted so that the following formulas (1) and (2) were satisfied, and polyester was discharged from each spinneret and cooled to form a yarn. After heating and stretching only the shrinkable yarn group (B), the stretched yarn group (A)
After the yarn is shrunk with the shrinkable yarn group (B), the spinning speed V (m / m
Min) = 2500 to 4000 to form a mixed fiber of a stretched yarn group (A) composed of undrawn yarn and a contracted yarn group (B) composed of directly spun drawn yarn, and thereafter, the mixed yarn is used. By producing a fabric and subjecting the fabric to a constant-length heat treatment under heating at a temperature not lower than the glass transition temperature of the polyester and not higher than 120 ° C., the polyester comprising the heat-extended yarn group (A ′) and the heat-shrinkable yarn group (B ′) It is a method of obtaining a fabric composed of mixed yarn.

Q (A) / Q (B) ≧ 1 (1) 5 V / (3. 0 × 10 ⁴ ) ≦ Qf (A) ≦ 0.833V / (1.5 × 10 ³ ) (2)

Further, in the method for producing a fiber product according to the fourth aspect of the present invention, in the method for producing a fiber product according to the third aspect of the present invention, the extended yarn group (A) and the shrinkable yarn group (B) are combined. As means, a fluid entanglement process is used.

The polyester mixed yarn comprising the group of heat-extended yarns (A ') and the group of heat-shrinkable yarns (B') obtained by the method for producing fiber products of the first and second inventions is post-processed. By applying the heat treatment described above, a soft, swelling and good texture is developed, so that, for example, a heat treatment after manufacturing the fabric results in a soft, swelling fabric.

[0018] The polyester fiber is composed of a heat-extensible yarn group (A ') and a heat-shrinkable yarn group (B') obtained by the method for producing a fiber product of the third and fourth inventions. By subjecting this fabric to a post-processing heat treatment, the fabric becomes soft, swelled and has a good texture.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for producing a fiber product according to the present invention will be described with reference to the illustrated embodiments. FIG. 1 is a schematic explanatory view of a spinning apparatus showing one example up to an intermediate step of a method for producing a fiber product of the present invention.

The method for producing the polyester mixed fiber as the fiber product of the first and second aspects of the present invention includes a first step consisting of the steps shown in FIG. 1 and a second step described later.

In the first step, the spinneret 1 for the elongated yarn group (A) for melting and discharging the elongated yarn group (A) and the contracted yarn group (B) for melting and discharging the contracted yarn group (B) in FIG.
Of the polyester from the spinneret 1 for the extended yarn group (A) using the spinning apparatus provided with the spinneret 2 for
(A), the discharge amount Q (B) of the polyester from the spinneret 2 for the shrinkable yarn group (B), and the discharge amount Qf of the polyester per nozzle hole of the spinneret for the elongate yarn group (A).
(A) (g / min) to satisfy the following formulas (1) and (2) so as to melt and discharge the polyester from the spinneret 1 and the spinneret 2, respectively, and blow cool air onto the polyester. Apply and cool to form yarn.

Q (A) / Q (B) ≧ 1 (1) 5 V / (3. 0 × 10 ⁴ ) ≦ Qf (A) ≦ 0.833 V / (1.5 × 10 ³ ) (2) [In the above formula (2), V is a spinning speed (m /
Minute). ]

Here, the discharge amount Q (A) of the polyester from the spinneret 1 for the extended yarn group (A) and the contracted yarn group (B)
The discharge amount Q (B) of the polyester from the spinneret 2 for use may be the same, but the discharge amount Q (B) of the polyester for the contraction yarn group (B) may be larger than the discharge amount Q (B) of the polyester. and a lot of people in the discharge amount Q (a) of the polyester of use, other words
Q (A) / Q (B)> 1 so that
To obtain a polyester mixed yarn that expresses a larger swelling.
Can be

Subsequently, an oil agent is applied to the polyester yarn from the spinneret 1 for the extended yarn group (A) by the oil applying device 3 while the yarn is undrawn, and the bundle is bundled. The first take-up roller 6 of FIG. On the other hand, the polyester yarn from the spinneret 2 for the other shrinkable yarn group (B) passes through the heating cylinder 4 and is heated and drawn, and then the oil agent is applied to the yarn by the oil applying device 5 to be bundled. Then, it is picked up by the first pick-up roller 7 for the shrinkable yarn group (B). The heating and stretching of the yarns composed of the shrinkable yarn group (B) by passing through the heating cylinder 4 is for causing the crystal part to be oriented by the heating and stretching. The stretching is performed at a temperature lower than the temperature.

Next, a first take-up roller 6 for the extended yarn group (A) and a first take-up roller 7 for the contracted yarn group (B)
After the elongating yarn group (A) and the shrinking yarn group (B) that have passed through are combined by the entanglement imparting device 8, the spinning speed V (m / min) is passed through the second take-up roller 9 and the winding machine 10 = 2
By winding at 500 to 4000, a mixed fiber of a stretched yarn group (A) made of undrawn yarn and a contracted yarn group (B) made of directly spun drawn yarn is obtained. In addition, the above-mentioned extended yarn group (A)
It is preferable to use a fluid entanglement treatment for the conjugate yarn of the shrinkable yarn group (B).

In the latter step, the mixed fiber of the extended yarn group (A) composed of undrawn yarn and the contracted yarn group (B) composed of directly spun drawn yarn obtained in the above-mentioned first step is heated to a temperature higher than the glass transition temperature of polyester. This is subjected to a constant-length heat treatment under heating at a temperature of not more than 120 ° C., thereby obtaining a polyester mixed fiber yarn comprising a target heat-extended yarn group (A ′) and a heat-shrinkable yarn group (B ′).

The polyester mixed yarn comprising the heat-extended yarn group (A ') and the heat-shrinkable yarn group (B') is subjected to a subsequent heat treatment, whereby the heat-extended yarn group (A ')
Extend beyond the length before undergoing this heat treatment. On the other hand,
The heat-shrinkable yarn group (B ′) shrinks more than the length before receiving the heat treatment. For this reason, the heat-shrinkable yarn group (B ') forms the core side and the heat-extended yarn group (A') spontaneously expands and forms a sheath side by covering the outside in a loop shape by the subsequent heat treatment. However, this gives a soft, swelling and good texture.

Heat-stretched yarn group (A ') and heat-shrinkable yarn group (B')
In the polyester mixed fiber yarn, the heat-extended yarn group (A ') causes spontaneous elongation by subsequent heating.
It is estimated that: That is, the polyester fiber discharged from the spinneret so as to satisfy the above-mentioned formula (2) is not drawn by heating but is taken up at a spinning speed V (m / min) of 2500 to 4000. When the extended yarn group (A) composed of the drawn yarn is obtained,
The stretched yarn group (A) composed of the undrawn yarn has a structure composed of a crystalline phase, an amorphous phase, and an oriented intermediate phase in an intermediate state between them. By subjecting this to a heat-extended yarn group (A ′) by subjecting it to a constant-length heat treatment under heating at a temperature equal to or higher than the glass transition temperature of the polyester to 120 ° C. or less, internal strain in the fiber structure in the elongated yarn group (A) is reduced. But,
The oriented mesophase will remain without crystallization being completed. For this reason, crystallization of the above-mentioned oriented mesophase occurs due to the heat history at the time of subsequent heating, and it is considered that the thermally elongated yarn group (A ′) is spontaneously elongated at this time.

The method for producing a fiber product composed of a fabric composed of the polyester mixed yarns of the third and fourth inventions is the same as that of the polyester mixed yarns of the first and second inventions. , And a later step described later.

The first step comprises the same steps as the first step in the method for producing a polyester mixed fiber of the first invention, and comprises a group of stretched yarns (A) composed of undrawn yarns and a group of contracted yarns composed of directly spun drawn yarns ( B) to obtain a mixed fiber. In addition, it is preferable to use a fluid entanglement process at the time of tying in the step of obtaining the mixed yarn of the elongated yarn group (A) and the contracted yarn group (B).

In the latter step, after forming a fabric by blended yarns of the extended yarn group (A) composed of undrawn yarn and the contracted yarn group (B) composed of directly spun drawn yarn obtained in the above first step, By subjecting the cloth to a constant-length heat treatment under heating at a temperature not lower than the glass transition temperature of the polyester and not higher than 120 ° C., it is constituted by a polyester mixed yarn comprising a heat-extended yarn group (A ′) and a heat-shrinkable yarn group (B ′). To obtain the desired fabric.

Heat-stretched yarn group (A ') and heat-shrinkable yarn group (B')
The fabric composed of polyester mixed yarn by
When the fabric is subjected to the subsequent heat treatment, the heat-stretched yarn group (A ') is longer than the length before the heat treatment. On the other hand, the heat-shrinkable yarn group (B ′) shrinks more than the length before receiving the heat treatment. For this reason, the heat-shrinkable yarn group (B ') forms the core side and the heat-extended yarn group (A') spontaneously expands and forms a sheath side by covering the outside in a loop shape by the subsequent heat treatment. This results in a soft, bulging, good textured fabric.

In the fabric composed of the polyester mixed yarn of the heat-extended yarn group (A ') and the heat-shrinkable yarn group (B'), the heat-extended yarn group (A ') and the heat-shrinkable yarn group (B') The cause of the spontaneous elongation of the heat-expandable yarn group (A ') of the polyester mixed yarn by the
It is presumed that this is the same as that described in the section on the production of the polyester blended yarn using the heat-extended yarn group (A ′) and the heat-shrinkable yarn group (B ′).

In the method for producing a fiber product of the present invention as described above, the polyester used as a spinning raw material of the polyester mixed fiber is a polymer having ethylene terephthalate as a main repeating unit. In other words, terephthalic acid or its ester-forming derivative as the main acid component,
Polyester containing ethylene glycol as a main alcohol component, and one of an acid component and / or an alcohol component.
The part may be replaced with another acid component and / or alcohol component.

The replaceable acid components include isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenylsulfondicarboxylic acid, adipic acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, 5-sodium sulfoisophthalic acid, -Sodium sulfoisophthalic acid, sodium 1,8-dicarboxynaphthalene-3-sulfonate, p-β-oxyethoxybenzoic acid, or an ester-forming derivative thereof.

The replaceable alcohol component includes propylene glycol, butylene glycol,
4-cyclohexanedimethanol, neopentyl glycol, 1,4-bis (β-oxyethoxy) benzene,
And bisglycol ether of bisphenol A.

The polyester containing ethylene terephthalate as a main repeating unit can be synthesized by a known method. For example, a polyester composed of polyethylene terephthalate produces a terephthalic acid glycol ester or a low polymer thereof by an esterification reaction between terephthalic acid and ethylene glycol or a transesterification reaction between dimethyl terephthalate and ethylene glycol. It can be obtained by polycondensing a product. In the synthesis of polyester, it goes without saying that a catalyst, a matting agent, an antioxidant, an anti-coloring agent, an ether bond by-product inhibitor, a flame retardant, an ultraviolet absorber and the like are appropriately added.

As a spinneret for spinning polyester by the melt spinning method, a spinneret having a circular, triangular or + -shaped nozzle hole can be used.

In the method for producing a fiber product of the present invention, in spinning the above polyester, the spinneret for the extended yarn group (A) for melting and discharging the extended yarn group (A) and the contracting yarn group (B) are melted and discharged. The spinning device provided with the spinneret for the shrinking yarn group (B) to be stretched, and the elongating yarn group (A)
Discharge amount Q (A) of the polyester from the spinneret for
The discharge amount Q (B) of the polyester from the spinneret for the contracting yarn group (B) and the discharge amount Qf (A) (g / g) of the polyester per nozzle hole of the spinneret for the elongate yarn group (A)
It is necessary to discharge the polyester from each spinneret so that the following formulas (1) and (2) are satisfied. Q (A) / Q (B) ≧ 1 (1) 5V / (3.0 × 10 ⁴ ) ≦ Qf (A) ≦ 0.833V / (1.5 × 10 ³ ) (2) [In the above formula (2), V is a spinning speed (m /
Minute). ]

The relationship between the discharge amount Q (A) of polyester from the spinneret for the extended yarn group (A) and the discharge amount Q (B) of polyester from the spinneret for the contraction yarn group (B) is Q
When (A) / Q (B) <1, the discharge amount of the polyester of the stretched yarn group (A) is smaller than the discharge amount Q (B) of the polyester for the contraction yarn group (B). A ′) and the heat-shrinkable yarn group (B ′) formed by heat-shrinking the yarn of the heat-shrinkable yarn group (B ′). And it is difficult to obtain a soft, swelling and good texture.

The polyester discharge amount Qf (A) (g / g) per nozzle hole of the spinneret for the extended yarn group (A) is used.
) Is less than 5 V / (3.0 × 10 ⁴ ), the oriented crystallization of the stretched yarn group (A) composed of undrawn yarn proceeds. The spontaneous elongation performance of the heat-extended yarn group (A ') after being subjected to the constant-length heat treatment under heating at a temperature of not more than ° C is reduced.

Further, the discharge amount Qf (A) (g) of the polyester per nozzle hole of the spinneret for the extended yarn group (A)
/ Min) exceeds 0.833 V / (1.5 × 10 ³ ), the single yarn fineness of the polyester blended yarns of the heat-extended yarn group (A ′) and the heat-shrinkable yarn group (B ′) becomes too large. Therefore, the texture of the obtained fabric becomes hard.

In the method for producing a fiber product of the present invention, the spinneret for the extended yarn group (A) for melting and discharging the extended yarn group (A) and the contracted yarn group (B) for melting and discharging the contracted yarn group (B) are provided. The polyester discharged from the spinneret for the extended yarn group (A) and the spinneret for the shrinkable yarn group (B) is cooled by a spinning apparatus provided with a spinneret for the above) to form a yarn. After heat-drawing only the shrinkable yarn group (B), the stretched yarn group (A) and the shrinkable yarn group (B) are combined, and then the spinning speed V (m / min) = 2,500 to 40
It is necessary to wind at 00.

If the spinning speed V at this time is less than 2500 m / min, the formation of the fiber structure of the shrinkable yarn group (B) becomes insufficient, and the heat expansion yarn group (A ') and the heat shrinkable yarn group (B') Since the elongation and the boiling water shrinkage ratio of the heat shrinkable yarn group (B ') in the polyester mixed yarn become too high, there may be a problem that the obtained fabric becomes hard or becomes brittle due to alkali weight reduction processing. .

If the spinning speed V exceeds 4000 m / min, the oriented crystallization of the stretched yarn group (A) composed of undrawn yarns proceeds. The spontaneous elongation performance of the heat-extended yarn group (A ') after being subjected to the following constant-length heat treatment under heating is reduced, and it is difficult to obtain a soft, swollen, and good texture.

In the first and second inventions, the above 250
The mixed yarn of the stretched yarn group (A) and the shrinkable yarn group (B) wound at a spinning speed V of 0 to 4000 (m / min) is further heated under heating at a temperature not lower than the glass transition temperature of the polyester and not higher than 120 ° C. It is necessary to perform constant-length heat treatment. In the third and fourth inventions, the above-mentioned 2500 to 4000 (m / m
Min) at a spinning speed V of the mixed yarn formed by the extended yarn group (A) and the contracted yarn group (B).
It is necessary to perform a constant-length heat treatment under the following heating.
As a result, the stretched yarn group (A) of the mixed fiber consisting of the stretched yarn group (A) and the shrinkable yarn group (B) becomes the thermally stretched yarn group (A ') having spontaneous stretching performance. When heated, the thermally elongated yarn group (A ') is elongated.

If the heating temperature in the above-mentioned constant-length heat treatment is lower than the glass transition temperature of the polyester, the internal strain in the stretched yarn group (A) remains unrelieved, so that the heat-stretched yarn group (A ′) is not used in the subsequent step. It contracts when subjected to thermal history and does not have spontaneous elongation. If the heating temperature in the constant-length heat treatment exceeds 120 ° C., crystallization of the oriented mesophase in the stretched yarn group (A) proceeds to form a stable structure. When it receives the heat history in the above, it does not show sufficient spontaneous elongation.

Further, in the case of the mixed yarn comprising the extended yarn group (A) and the contracted yarn group (B), the heat shrinkage of the extended yarn group (A) is larger than that of the contracted yarn group (B). Above the glass transition temperature of the above polyester ~ 120
When the heat treatment under heating at a temperature of not more than 0 ° C. is performed in a state where it can be freely shrunk, the stretched yarn group (A) is located on the core side, and not only the amorphous phase but also the orientation in the stretched yarn group (A) is oriented. Since the distortion of the intermediate phase is also relaxed and a stable structure is obtained, the heat-extended yarn group (A ′) does not exhibit sufficient spontaneous elongation when subjected to a heat history in a subsequent step.

In the method for producing a fiber product composed of polyester blended yarns using the heat-extended yarn group (A ') and the heat-shrinkable yarn group (B') according to the first and second inventions, the expanded yarn group (A) The fixed-length heat treatment of the mixed yarn with the shrinkable yarn group (B) can be performed in the twist stop setting step or the sizing step after twisting the mixed yarn with the extended yarn group (A) and the shrinkable yarn group (B). It is.

[0050]

Hereinafter, a more specific structure of the method for producing a fiber product of the present invention will be described with reference to examples.

Examples 1 to 3 and Comparative Examples 1 to 8 For a stretched yarn group (A) having a number of nozzle holes shown in a predetermined column of Table 1, using a spinning apparatus having the schematic structure shown in FIG. Was melted at 285 ° C. by a spinning apparatus provided with a spinneret 1 and a spinneret 2 for a shrinkable yarn group (B).
Of polyethylene terephthalate is melted and discharged at a discharge rate (Q (A), Q (B)) (g / min) also shown in a predetermined column of Table 1, and then, in a 1 m length area immediately below the spinneret. 23 ° C., wind speed 0.3 m
/ Sec. Cooled by blowing cold air of
And a yarn comprising the shrinkable yarn group (B). At this time, the discharge amount (Qf) of the polyester per nozzle hole of the spinneret for the extended yarn group (A)
(A)) (g / min) are as shown in the predetermined column of Table 2 below.

Next, polyester is ejected from the spinneret 1 for the extended yarn group (A) to make the extended yarn group (A) fiberized.
Then, an oil agent is applied by an oil agent applying device 3 to be bundled, and the bundle is taken up by a first take-up roller 6 for the extended yarn group (A), and the polyester is discharged from the spinneret 2 for the other contracted yarn group (B). The formed shrinkable yarn group (B) passes through a heating cylinder 4 at 200 ° C., and is heated and stretched. Then, an oil agent is applied by an oil agent applying device 5 to be bundled, and the first take-up roller 7 for the shrink yarn group (B) is used. I took it.

Subsequently, the respective yarns passed through the first take-up roller 6 for the elongated yarn group (A) and the first take-up roller 7 for the contracted yarn group (B), that is, the extended yarn group (A) and The shrinkable yarn group (B) was subjected to a fluid entanglement treatment at an air pressure of 4 kg / cm ² using an entanglement imparting device indicated by reference numeral 8, and further passed through a second take-up roller 9 to be taken up by a winding machine 10. The spinning speed V (m / m
The mixed yarn of the stretched yarn group (A) made of undrawn yarn and the shrinked yarn group (B) made of directly spun drawn yarn was obtained by winding (step a).

Thereafter, the mixed yarn of the extended yarn group (A) composed of the undrawn yarn obtained in the above step a and the contracted yarn group (B) composed of the directly spun drawn yarn was fixed to a fixed length. In this state, by subjecting to a heat treatment under the conditions shown in the predetermined column of Table 2, a polyester-mixed yarn composed of a heat-extended yarn group (A ') and a heat-shrinkable yarn group (B') was obtained (= b step).

Further, after forming a plain woven fabric with a mixed yarn of the extended yarn group (A) composed of the undrawn yarn obtained in the above step a and the shrinkable yarn group (B) composed of the directly spun drawn yarn, this woven material is formed. Is fixed to a frame in a fixed length state, and is subjected to a heat treatment under the conditions shown in a predetermined column of Table 2, thereby being constituted by a polyester mixed fiber yarn composed of a heat-extended yarn group (A ′) and a heat-shrinkable yarn group (B ′). Was obtained (= c step).

[0056]

[Table 1]

[0057]

[Table 2]

<Experiment 1> Only the stretched yarn group (A) was obtained under the same conditions as the step a described in Examples 1 to 3 and Comparative Examples 1 to 8, ie, the shrinkable yarn group. After obtaining only the stretched yarn group (A) consisting of the undrawn yarn which has not been combined with (B), this is subjected to the same heat treatment as in the step b, whereby the heat-stretched yarn group (A ') for the test is obtained. A polyester yarn was formed.

Next, the material comprising the heat-stretched yarn group (A ') for the above test was heated from 30 ° C. to 230 ° C. with a constant stress by a thermomechanical analyzer (manufactured by Seiko Denshi Co., Ltd .: TMA 120 ° C.). By measuring the change in fiber length when heated, the spontaneous elongation at 150 ° C. (%) was determined according to the following equation (3). Spontaneous elongation rate (%) = (L ₁ −L ₀ ) × 100 / L ₀ (3) [In the above equation (3), L ₀ is the thermal elongation for the test. yarn group (a ') in length (at room temperature of the length of, L ₁ is the heat expansion yarn group a) at 0.99 ° C.'. ] Table 3
Shown in

<Experiment 2> The fabrics described in Examples 1 to 3 and Comparative Examples 1 to 8, ie, the heat-stretched yarn group (A ') and the heat-shrinkable yarn group (B) obtained by the step c. ') At 100 ° C. for 9% with a 2% by weight NaOH solution.
After being subjected to a weight reduction treatment for 0 minutes, a dyeing treatment was further performed at 130 ° C. for 60 minutes, followed by a dry heat treatment at 150 ° C. for 1 minute, and the texture of the obtained fabric was evaluated. Table 3 shows the results.

[0061]

[Table 3]

As can be seen from Tables 1, 2 and 3, in Comparative Example 1, the discharge amount Q (A) of the polyester from the spinneret for the extended yarn group (A) and the contracted yarn group (B) Of polyester discharged from spinneret
Since the ratio (Q (A) / Q (B)) to (B) is smaller than 1, soft swelling cannot be obtained, and the texture of the fabric decreases.

In Comparative Example 2, the extended yarn group (A)
Discharge rate (Qf (A)) (g / min) per nozzle hole of a spinneret for use is 5 V / (3.0 × 1).
Since it is smaller than 0 ⁴ ), the spontaneous elongation performance of the heat-extended yarn group (A ′) after the constant-length heat treatment is low, and a fabric with good swelling cannot be obtained. In the other Comparative Example 3, the discharge amount (Qf (A)) (g / min) of the polyester per nozzle hole of the spinneret for the extended yarn group (A) was:
Since it exceeds 0.833 V / (1.5 × 10 ³ ), the texture of the obtained fabric becomes hard.

Further, in Comparative Example 4, the spinning speed V was 2
Since it is smaller than 500 m / min, the texture of the obtained fabric becomes hard. In Comparative Example 5, since the spinning speed V was higher than 4000 m / min, the spontaneous elongation performance of the heat-extended yarn group (A ') after performing the constant-length heat treatment was low, and a cloth with good swelling was obtained. I can't get it.

Comparative Example 6 is a case where the fixed-length heat treatment is not performed, and the stretched yarn group (A) does not have spontaneous extensibility, and a swelled cloth cannot be obtained. In Comparative Example 7, since the heat treatment was performed at a constant length at a temperature lower than the glass transition temperature of the polyester, the spontaneous elongation performance of the heat-extended yarn group (A ') was low, and a swollen fabric could not be obtained. Further, in Comparative Example 8, since the heat treatment was a constant-length heat treatment at a temperature higher than 120 ° C., the spontaneous elongation performance of the heat-extended yarn group (A ′) was not sufficient, and a fabric with good swelling could not be obtained.

[0066]

According to the first to fourth aspects of the present invention, the first and fourth processes of the present invention utilize the direct spinning and drawing method of the polyester to form the stretched yarn group (A) and the shrinkable yarn group. (B), ie, a process of obtaining a polyester mixed fiber yarn, that is, an undrawn yarn obtained by melt-spinning a mixed fiber of an extended yarn group (A) composed of undrawn yarn and a contracted yarn group (B) composed of directly spun drawn yarn. It consists of a step of directly forming from a melt spinning step without winding the yarn once.

In the first and second aspects of the present invention, a fixed-length heat treatment is performed in the subsequent step. This is to obtain a polyester mixed yarn of the extended yarn group (A ') and the heat-shrinkable yarn group (B'). In the third and fourth inventions, a soft and good yarn is obtained by further subjecting the yarn to a heat treatment. The present invention is intended to obtain a fabric composed of a polyester mixed yarn of a heat-extensible yarn group (A ′) and a heat-shrinkable yarn group (B ′) each composed of a polyester mixed yarn exhibiting swelling.

Therefore, in the first and second inventions,
When subjected to a heat treatment, the polyester mixed yarns of the heat-expandable yarn group (A ') and the heat-shrinkable yarn group (B'), which are made of polyester mixed yarns that exhibit a soft swelling and good texture, are subjected to complicated processes. It can be obtained easily and stably without using it.

In the third and fourth aspects of the present invention, when the fabric is subjected to a heat treatment, the fabric is made of a polyester mixed fiber which exhibits a soft swelling and good texture, that is, a heat-stretched yarn group (A ') and The fabric composed of the polyester mixed fiber with the shrinkable yarn group (B ′) can be easily and stably obtained without taking complicated steps.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a spinning device showing one example up to an intermediate step of a method for producing a fiber product of the present invention.

[Explanation of symbols]

 1 ··· Spinneret for extended yarn group (A) 2 ··· Spinneret for contracted yarn group (B) 3 ··· Oiling device 4 ··· Heating cylinder 5 ··· Oiling agent Apparatus 6 First take-up roller for extended yarn group (A) 7 First take-up roller for contracted yarn group (B) 8 Entanglement processing device 9 Second take-up roller 10 · · · Winding machine

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-158183 (JP, A) JP-A 9-157987 (JP, A) JP-A-11-107091 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) F-term theme code 4L036

Claims (4)

(57) [Claims] 1. A spinning apparatus provided with a spinneret for a stretched yarn group (A) that melts and discharges a stretched yarn group (A) and a spinneret for a contraction yarn group (B) that melts and discharges a contraction yarn group (B). The discharge amount Q (A) of the polyester from the spinneret for the extended yarn group (A), the discharge amount Q (B) of the polyester from the spinneret for the contraction yarn group (B), and the discharge amount Q (B) for the extended yarn group (A). The polyester is discharged from each spinneret so that the discharge amount Qf (A) (g / min) of the polyester per nozzle hole of the spinneret satisfies the following formulas (1) and (2). And cool it to form a thread,
Subsequently, only the shrinkable yarn group (B) is heated and drawn, and then the extended yarn group (A) and the shrinkable yarn group (B) are combined.
(M / min) = 2500 to 4000 to form a mixed fiber of a stretched yarn group (A) composed of undrawn yarn and a contracted yarn group (B) composed of directly spun drawn yarn. The fiber is above the glass transition temperature of polyester ~ 12
A method for producing a fiber product comprising a polyester mixed yarn comprising a heat-extended yarn group (A ') and a heat-shrinkable yarn group (B'), wherein the fiber product is subjected to constant-length heat treatment under heating at 0 ° C or lower. Q (A) / Q (B) ≧ 1 (1) 5V / (3.0 × 10 ⁴ ) ≦ Qf (A) ≦ 0.833V / (1.5 × 10 ³ ) (2) 2. The heat-expandable yarn group (A ′) and heat shrinkage according to claim 1, wherein a fluid entanglement process is used as a means for joining the elongate yarn group (A) and the shrinkable yarn group (B). A method for producing a fiber product comprising a polyester mixed fiber with the yarn group (B '). 3. A spinning device provided with a spinneret for a stretched yarn group (A) that melts and discharges a stretched yarn group (A) and a spinneret for a contraction yarn group (B) that melts and discharges a contraction yarn group (B). The discharge amount Q (A) of the polyester from the spinneret for the extended yarn group (A), the discharge amount Q (B) of the polyester from the spinneret for the contraction yarn group (B), and the discharge amount Q (B) for the extended yarn group (A). The polyester is discharged from each spinneret so that the discharge amount Qf (A) (g / min) of the polyester per nozzle hole of the spinneret satisfies the following formulas (1) and (2). And cool it to form a thread,
Subsequently, only the shrinkable yarn group (B) is heated and drawn, and then the extended yarn group (A) and the shrinkable yarn group (B) are combined.
(M / min) = 2500 to 4000 to form a mixed fiber of a stretched yarn group (A) composed of undrawn yarn and a contracted yarn group (B) composed of directly spun drawn yarn. A group of heat-extended yarns (A ′), comprising producing a fabric from a woven fiber, and subjecting the fabric to a constant-length heat treatment under heating at a temperature from the glass transition temperature of the polyester to 120 ° C. or less.
And a heat-shrinkable yarn group (B ') for producing a fiber product comprising a fabric composed of polyester mixed yarn. Q (A) / Q (B) ≧ 1 (1) 5V / (3.0 × 10 ⁴ ) ≦ Qf (A) ≦ 0.833V / (1.5 × 10 ³ ) (2) 4. The heat-expandable yarn group (A ′) and heat shrinkage according to claim 3, wherein a fluid entanglement process is used as a means for joining the elongate yarn group (A) and the shrinkable yarn group (B). A method for producing a fiber product comprising a fabric composed of a polyester mixed fiber with a yarn group (B ').