JPH07324224A - Polyester-based fiber and polyester continuous filament woven fabric - Google Patents

Abstract

PURPOSE:To obtain fibers, windable at a high speed by a spinning direct drawing method and capable of providing continuous filament woven fabric having an excellent touch feeling and resilience when used as at least one of warp and weft yarns of the continuous filament woven fabric. CONSTITUTION:The polyester-based fibers for polyester continuous filament woven fabric are obtained by a spinning direct drawing method and have values of physical properties thereof as follows: <=0.65 intrinsic viscosity IVf>=0.35g/ dsigmamax peak stress of heat shrinkage stress, >=12% shrinkage factor in boiling water SHW, >=3% characteristic values of heat shrinkage factor RSH16 and >=5d single filament denier dpf. This polyester continuous filament woven fabric comprises the resultant po1yester-based fibers used as at least either of warp and weft yarns.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a polyester fiber,
And a polyester long-fiber woven fabric using the fiber, which is excellent in elasticity and texture.

[0002]

2. Description of the Related Art Polyester fibers have been widely used in addition to clothing applications due to their characteristics. Especially, supported by the recent boom of new synthetic fibers, the production volume is still increasing.

On the other hand, in order to improve productivity, labor saving due to labor shortage, and automation, a spinning direct drawing method (spin draw method) is adopted in which spinning is carried out without being wound once from the conventional two-step method of spinning and drawing. The production method is being actively changed to the: SPD) method. The production of fibers by this spinning direct drawing method has been expanded not only to the field of industrial materials such as fish nets such as rubber-reinforcing fibers, sewing threads, ropes and hoses, but also to the field of clothing.

In order to improve the productivity, the direct spinning / drawing method has recently reached a final winding speed as high as 6000 m / min or more.

[0005]

However, as the speed is increased, problems such as securing the heat setting time and increasing the difficulty of the winding technique occur, and the polyester fiber produced by the spinning direct drawing method is wound up. In this case, if the conventionally known winding conditions are adopted as they are, there is a problem that the quality is inferior to that of a yarn (burn yarn) obtained by a conventional spinning and drawing two-step method. For example, when polyester fibers produced by the spinning direct drawing method are used as warp yarns for long-fiber fabrics, the product bulges are insufficient compared to burn yarns, and only thin and poorly hand-held fabrics are produced, resulting in poor texture. There was a problem.

The object of the present invention is to solve the above-mentioned problems associated with speeding up, to allow polyester fibers obtained by the spinning direct drawing method to be wound up at high speed, and for warp and weft of long fiber woven fabric. When used for at least one of
It is an object of the present invention to provide a polyester fiber capable of obtaining a long-fiber woven fabric having excellent texture and elasticity.
Another object of the present invention is to provide a polyester continuous fiber woven fabric in which the above polyester fiber is used in at least one of warp and weft.

[0007]

DISCLOSURE OF THE INVENTION The inventors of the present invention have made a difference in the characteristics of the raw yarn and the texture between the yarn obtained by the conventional two-step spinning and drawing process and the polyester fiber obtained by the direct spinning process. As a result of diligent study, the difference in the shrinkage characteristics of the raw yarn is the main cause of the difference in texture, and even the fiber obtained by the direct prevention stretching method has a specific structure and a specific shrinkage behavior. If it is a fiber, a long fiber woven fabric having an excellent texture can be obtained even under the same processing conditions as the fiber obtained in the conventional two steps. Further, if a fiber having a high single yarn denier is used as the above fiber, it is also elastic. It was found that an excellent long-fiber woven fabric can be obtained, and the present invention has been completed.

That is, in the polyester fiber for the polyester continuous fiber woven fabric of the present invention, the physical properties of the fiber are as follows: intrinsic viscosity IVf ≦ 0.65, peak stress of heat shrinkage stress σ _max ≧ 0.35 g / d, boiling water Shrinkage SHW ≧ 12%, thermal shrinkage characteristic value RSH16 ≧ 3%, and single yarn denier dpf ≧ 5d. Here, the heat shrinkage characteristic value RSH16 indicates a dry heat shrinkage of 160 ° C. after heat-treating the fiber at 150 ° C. for 5 seconds under 10% relaxation. In the present invention, the polyester fiber is intended to be one obtained by a direct spinning method. Further, the polyester continuous fiber woven fabric of the present invention is characterized in that the polyester fiber is used in at least one of the warp and the weft.

The present invention will be described in detail below. In the present invention, the polyester-based fiber is a fiber having an ethylene terephthalate unit as a main repeating unit, and specifically, a fiber made of polyester in which 80 mol% or more of all constituent units are ethylene terephthalate units. In particular, the main target is polyethylene terephthalate produced from terephthalic acid or its functional derivative and ethylene glycol or ethylene oxide, but in addition to terephthalic acid or its functional derivative as the acid component, the total amount of the acid component is the standard. Less than 20 mol%, preferably 10
Less than mol% of isophthalic acid, adipic acid, sebacic acid,
Azelaic acid, naphthalic acid, p-oxybenzoic acid,
2,5-dimethyl terephthalic acid, bis (p-carboxyphenoxy) ethane, 2,6-naphthalenedicarboxylic acid, 3,5-di (carbomethoxy) benzenesulfonate or functional derivatives thereof, and / or In addition to ethylene glycol as the glycol component, less than 20 mol%, preferably less than 10 mol% of diethylene glycol, propylene glycol, 1,4-butadiol, 1,4-hydroxymethylcyclohexane or other dihydric alcohol based on the total amount of the glycol component. It may be a copolymer produced by adding. Further, for example, a copolymer to which an aromatic polyphosphonate for imparting flame retardancy is added may be used. Further, an antioxidant, a matting agent, a coloring agent, a dyeability improving agent, a flame retardancy improving agent, an antistatic agent, etc. can be added to these polymers.

Various physical properties of the polyester fiber of the present invention will be described. First, the intrinsic viscosity of the polyester fiber is IVf ≦ 0.65. When the IVf exceeds 0.65, the spinning operation becomes extremely difficult because a higher temperature is required than that during melt spinning, which makes it difficult to produce good quality fibers that can be used in the present invention. Preferably intrinsic viscosity IV
f ≦ 0.62.

Peak stress of heat shrinkage stress of fiber σ _max ≧
It is 0.35 g / d. When σ _max is less than 0.35 g / d, it is not possible to obtain the texture due to the width-filling, which is a characteristic of the woven fabric, and the woven fabric has a poor hand-held feeling. Preferably, σ _max ≧ 0.45 g / d.

Next, the boiling water shrinkage of the fiber SHW ≧ 12%. If the SHW is less than 12%, the length and width of the woven fabric, especially shrinkage in the process requiring the length and width at the beginning such as the relaxation process, will be insufficient, resulting in a poor texture. SHW ≧ 15% is preferable.

Further, the heat shrinkage characteristic value RSH16 ≧
3%. Usually, to finish the fabric, for example,
It goes through each process of relaxing → presetting → weight loss → dyeing → finishing, but it is necessary to control in each process to obtain the final length and width. This is to prevent troubles in the process such as wrinkles. The heat shrinkage characteristic value RSH16 of the fiber is a measure for optimizing the behavior when passing through these processes. If this value is less than 3%, the final length and width are insufficient and the texture is poor. It becomes a woven fabric. RSH16 ≧ 6% is preferable.

Furthermore, the single yarn denier of the fiber dpf ≧ 5d
Is. A woven fabric having excellent elasticity can be obtained by using fibers having a single yarn denier of 5d or more for at least one of the warp and the weft. If the single yarn denier is less than 5d, the resulting fabric will have poor elasticity. Preferably dpf ≧ 6d
Is.

Next, an example of the process for producing the polyester fiber of the present invention by the direct spinning method will be described. The molten polymer is discharged from the spinneret, the spun yarn is cooled and solidified,
An oil agent is applied to this yarn and the yarn is taken up by a take-up roller. At this time, in order to improve migration of the oil agent after applying the oil agent, it is possible to install an interlace to which substantially no entanglement is applied in order to improve migration of the oil agent. The yarn thus drawn is stretched without winding and heat set. Further, without relaxing the orientation of the yarn, the yarn temperature is cooled below the glass transition point and then wound up with some relaxation.

In order to obtain the polyester fiber of the present invention in the yarn making process, it is preferable to adopt the following method. That is, the speed at which the take-up roller pulls it out has a great influence on the heat shrinkage rate characteristic value RSH16 of the fiber, so it is necessary to set the speed at which RSH16 is 3% or more. Although not particularly limited, a speed at which crystallization (orientation crystallization) occurs during spinning is desirable. From such a viewpoint, the take-up speed is preferably 35.
00 m / min or less, more preferably 2800 m / mi
n or less is preferable.

It is desirable to apply heat to the yarn after the yarn is taken up and before the drawing. Although not particularly limited,
If the heating temperature is higher than the glass transition point, uneven dyeing occurs,
It is necessary in terms of quality, and a suitable heating temperature is preferably 70 to 100 ° C. If it is less than 70 ° C., the stretching point is hard to be fixed, and if it exceeds 100 ° C., the yarn shake on the roller becomes large and uneven dyeing occurs, which not only deteriorates the quality but also increases the yarn breakage, which is not preferable.

Next, the heated yarn is drawn and heat set. Stretching is adjusted to obtain the required high elongation
Furthermore, it is adjusted to obtain the required shrinkage behavior. In particular,
Not only the temperature but also the time is an important point in the heat setting, and the heat setting is not particularly limited, but it is preferable to apply the heat setting for 0.01 to 0.1 seconds. If the time is less than this time, the quality such as uneven dyeing becomes poor. The temperature of heat setting is 70 to 90
C is preferred.

In order to obtain a high heat shrinkage stress, it is essential to make the yarn temperature below the glass transition point without relaxing the orientation of the heat set yarn. Although not particularly limited, for example, a heating roller is further installed after the heat setting roller, the speeds of both rollers are the same, and the temperature of the installation roller is set to a temperature not higher than the glass transition point. Is set to a temperature below the glass transition point. Here, when the installation roller is not installed, or at a temperature equal to or higher than the glass transition point, it is necessary to lower the tension for winding the package in order to adjust the shape of the package. A fiber with high heat shrinkage stress cannot be obtained.

Furthermore, since the single yarn denier becomes thicker, in the conventional two-step system, twist accumulation occurs during drawing and more yarn breakage occurs. This problem is solved by directly connecting spinning and drawing by the spinning direct drawing method, which is suitable for a thick multifilament having a single yarn denier.

[0021]

In the spin draw (SPD) system, the final roller is usually the heating roller for the reason of ensuring the heat setting time, and the temperature thereof is set to be the highest as compared with the other rollers. On the other hand, from the viewpoint of winding, taking into consideration the winding shape and tightening, the winding is performed with a relatively low tension. Therefore, usually, the winding speed is set lower than the speed of the final roller to control the tension. as a result,
The yarn obtained by the conventional spin draw method (SPD yarn) is substantially subjected to relaxation on the final roller,
The orientation of the amorphous part was relaxed.

In the present invention, the orientation relaxation of the amorphous portion is eliminated to obtain a fiber having a high heat shrinkage stress, and a trouble occurs during the stretching which occurs in two steps (for example, the standing time is exceeded, a mistake in setting the twisting machine, etc.). ), And by controlling the shrinkage characteristics in the post-processing steps (especially dyeing processing), excellent texture can be obtained even with the spin draw method and the same process conditions as the fibers obtained in the conventional two steps. Have,
Moreover, a woven fabric excellent in elasticity can be obtained.

[0023]

EXAMPLES The present invention will be described in more detail below with reference to examples. In addition, the physical-property value in each Example and a comparative example was measured by the following method. <Intrinsic viscosity> Phenol / tetrachloroethane 60 /
It measures at 30 degreeC using the mixed solution of 40.

[0024] The peak stress sigma _max thermal shrinkage stress <peak stress sigma _max thermal shrinkage stress>, is measured by the following method, in the curve of the temperature-shrinkage stress, the highest stress value (peak stress) Say. Thermal stress measuring machine (eg SII
(TMA / SS100 manufactured by Mitsui Chemical Co., Ltd.) and a recording device linked to the measurement. The sample to be measured has a total denier of 75 to 1
2cm between the alignment chucks so that it falls within the range of 25d
Insert both ends so that the length becomes, and set it in the thermal stress measuring machine. While maintaining a constant length by applying an initial load of 1/30 g per denier to the sample, the temperature is raised from room temperature to 300 ° C. at a temperature rising rate of 20 ° C./min. The stress generated at this time is recorded and the maximum stress point (peak stress) is read.

<Shrinkage rate SHW> JIS-L1013
Measure according to.

<Heat Shrinkage Characteristic Value RSH16> Using a twisting machine or the like for fibers, 150 ° C. × 5 under 10% relaxation
After heat treatment for 2 seconds, the dry heat shrinkage rate under dry heat at 160 ° C. is measured.

Next, the arrangement of the rollers used in each of the examples and comparative examples will be described with reference to FIGS. 1 and 2. In FIG. 1, (NZ) is a spinneret, and viewed in the traveling direction of the yarn (1), a heating roller (GR1), a heating roller (GR2), a heating roller (GR3), and a winding roller (2). , Rolled cheese (3)
However, they are arranged in this order. 2 is the same as FIG. 1 except that the heating roller (GR3) of FIG. 1 is not arranged.

[Examples 1 to 4] Intrinsic viscosity IVp = 0.6
35 polyethylene terephthalate spinning temperature 280 ℃
Was extruded in accordance with the conditions shown in Table 1 with the arrangement of the rollers shown in FIG. 1 to obtain a finished yarn of 30d / 5f. Table 2 shows the physical properties of the obtained yarn. Then, the obtained fiber and 3
The yarn was mixed with 0d / 18f self-stretching yarn, twisted at 500 T / m, sized and warped. 7 for weft
Using 5d / 72f strong twist yarn as a raw material, relaxing under heat of 120 ° C, presetting under dry heat of 190 ° C,
After undergoing weight loss dyeing, finishing processing was carried out to obtain a woven fabric. Table 2 also shows the weft density, texture and elasticity of this woven fabric.

[Comparative Examples 1 to 4] With the arrangement of the rollers shown in FIG. 1, the conditions were changed as shown in Table 1, except that
A finished yarn of 30d / 5f was obtained in the same manner as in the example. Table 2 shows the physical properties of the obtained yarn. Next, a woven fabric was obtained from the obtained fibers in the same manner as in the example. Table 2 also shows the weft density, texture and elasticity of this woven fabric.

[Comparative Examples 5 to 6] With the arrangement of the rollers shown in FIG. 2, the conditions were changed as shown in Table 1, except that
A finished yarn of 30d / 5f was obtained in the same manner as in the example. Table 2 shows the physical properties of the obtained yarn. Next, a woven fabric was obtained from the obtained fibers in the same manner as in the example. Table 2 also shows the weft density, texture and elasticity of this woven fabric.

The polyester fibers obtained in Examples 1 to 4 all have an intrinsic viscosity, a peak stress σ _max of heat shrinkage stress, a boiling water shrinkage SHW, and a heat shrinkage characteristic value RSH1.
6 and single yarn denier have excellent physical property values, and the polyester long-fiber woven fabric produced from the fiber has excellent texture and elasticity. On the other hand, all of the polyester fibers obtained in Comparative Examples 1 to 6 were inferior to any of the physical properties of σ _max , SHW, RSH16, and single yarn denier, and thus were produced from the fibers. The polyester long-fiber woven fabric is inferior in texture and elasticity.

[0032]

As described above, the polyester fiber of the present invention has various physical properties such as intrinsic viscosity, peak stress σ _max of heat shrinkage stress, boiling water shrinkage SHW, heat shrinkage characteristic value RSH16, and single yarn denier. Is excellent. Therefore, even if the polyester fiber of the present invention is obtained by the spin draw method, it has an excellent texture even under the same process conditions as the fiber obtained by the conventional two-step method from the fiber, and It is possible to produce a polyester long-fiber woven fabric having excellent elasticity. As described above, according to the present invention, it is possible to achieve both high productivity of the polyester fiber by the spin draw method and quality of the polyester continuous fiber woven fabric obtained therefrom.

[0033]

[Table 1]

[0034]

[Table 2]

[Brief description of drawings]

FIG. 1 is a diagram showing the arrangement of rollers used in Examples 1 to 4 and Comparative Examples 1 to 4.

FIG. 2 is a diagram showing the arrangement of rollers used in Comparative Examples 5 and 6.

[Explanation of symbols]

 (NZ)… Spinneret (GR1)… Heating roller (GR2)… Heating roller (GR3)… Heating roller (1)… Yarn (2)… Winding roller (3)… Winding cheese

Claims (3)

[Claims] 1. A polyester fiber for polyester long-fiber woven fabric, wherein the physical properties of the fiber are: intrinsic viscosity IVf ≦ 0.65, peak stress of thermal shrinkage σ _max ≧ 0.35 g / d, boiling water shrinkage Rate SHW ≧ 12%, heat shrinkage characteristic value RSH16 ≧ 3%, and single yarn denier dpf ≧ 5d polyester fiber; wherein heat shrinkage characteristic value RSH16 means a fiber 1 after heat treatment at 150 ° C for 5 seconds under 10% relaxation
The dry heat shrinkage ratio at 60 ° C. is shown. 2. The polyester fiber according to claim 1, which is obtained by a spinning direct drawing method. 3. A polyester continuous fiber woven fabric, wherein the polyester fiber according to claim 1 is used in at least one of warp and weft.