JP2003119629A - Polyester conjugate multifilament yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester conjugate multifilament yarn having improved process-passage such as yarn-unreeling properties and tail-transferring properties, and imparting soft feeling to a product by improving swollen feeling, and rough and hard feeling, and further to provide a method for producing the yarn. SOLUTION: This polyester conjugate multifilament yarn is constituted of a side-by-side type filaments of which one sides are composed of a polyester consisting essentially of a polytrimethylene terephthalate, and the other sides are composed of a polyester consisting essentially of a polyethylene terephthalate, and has 50-95% ratio of diameters of yarn bundles, and 0-5 turns/50 cm twist count by remaining torque.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester composite multifilament yarn capable of improving the yarn release property from a package in which a filament yarn is wound, and the texture and quality of a product using the filament yarn. And a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, a side-by-side type or eccentric core-sheath type composite multifilament using polytrimethylene terephthalate (hereinafter sometimes referred to as PTT) has been disclosed in Japanese Examined Patent Publication No. 43-19108 and Japanese Patent Laid-Open No. 11-15.
8732, JP-A-11-189923 and JP-A-2000-328370.

However, the above-mentioned composite multifilament yarn has the following fatal defects because the coil phases of the monofilament filaments are aligned with each other.

When a package wound with the above-mentioned composite multifilament yarn is set on a creel, it is excessively loosened because of the large degree of self-crimping, and the yarn is "tangled", fluff occurs, yarn breaks, tail transfer failure, unraveling. This causes fluctuations in tension, which leads to a decrease in process passability.

Further, since the coil phases of the above-mentioned composite multifilament yarns are aligned, "crease" appears in the product, unevenness, and poor gloss are caused. Especially, in the usual woven fabric manufacturing process, the twisting is applied, so that the coil phases are further aligned and further promoted. It is.

This coil phase alignment is a peculiar phenomenon occurring in a bimetal structure of PTT having a very high elongation elastic recovery rate and ordinary polyethylene terephthalate (hereinafter sometimes referred to as PET), and the round cross section is more preferable than the irregular cross section. It is strong and easy to appear.

As a technique for solving such a problem, it is effective to carry out false twisting process of twisting, heat setting and untwisting, but the product has a "fukkatsuki" texture, shrinkage unevenness or dyeing peculiar to false twisted yarn. The unevenness is likely to occur, and the false twisted yarn has an excessively high residual torque twist, which lowers process passability and tends to cause uneven process tension, resulting in deterioration of product quality.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of the prior art and to improve process passability such as yarn loosening property and tail transition passability, and It can improve the feeling of hardness and give a soft texture,
The present invention provides a polyester composite multifilament yarn and a method for producing the same.

[0009]

The present invention adopts the following means for solving the above problems. That is, (1) one component is a polyester mainly composed of polytrimethylene terephthalate, and the other component is a polyester mainly composed of polyethylene terephthalate, and a side-by-side type or eccentric core-sheath type composite multifilament in the fiber length direction. The polyester composite multifilament yarn is characterized in that the yarn bundle diameter ratio of the multifilament yarn is 50 to 95% and the residual torque twist number is 0 to 5 times / 50 cm. (2) The cross-sectional deformation degree r of the multifilament yarn is 1.
0 ≦ r ≦ 1.5, The polyester composite multifilament yarn according to (1) above. (3) A multifilament yarn in which one component is a polyester mainly composed of polytrimethylene terephthalate and the other component is a polyester mainly composed of polyethylene terephthalate, which is compounded in a side-by-side type or an eccentric core-sheath type in the fiber length direction. A method for producing a polyester composite multifilament yarn, which comprises twisting and untwisting. (4) A method for producing a polyester composite multifilament yarn, which comprises subjecting to heat treatment and twisting-untwisting. (5) The method for producing a polyester composite multifilament yarn according to (4), wherein the temperature of the heat treatment is, from the two components, the glass transition point of the low temperature side polyester to room temperature.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION One of the polyester composite multifilament yarns of the present invention is a polyester mainly composed of polytrimethylene terephthalate, and the other is a polyester mainly composed of polyethylene terephthalate.

The PTT of the present invention is a polyester obtained by using terephthalic acid as a main acid component and 1,3-propanediol as a main component. Further, the PET of the present invention is a polyester obtained by using terephthalic acid as a main acid component and an ethylene glycol component.

However, any of the components may contain other copolymerizable components capable of forming an ester bond in a proportion of 20 mol% or more, preferably 10 mol% or less.

Examples of the copolymerizable compound include isophthalic acid, succinic acid, cyclohexanedicarboxylic acid,
Dicarboxylic acids such as adipic acid, dimer acid, sebacic acid, 5-sodium sulfoisophthalic acid, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, Examples include diols such as polypropylene glycol, but are not limited thereto.

In the case of a composite of side-by-side, it is composed of a side-by-side type or an eccentric sheath type in which two components are laminated.

In the case of the side-by-side composite, particularly when the composite boundary surface between the two components is linear in the fiber cross section, the coil developing ability is higher and the stretchability is also improved. In the case of an eccentric core-sheath, the high-viscosity component PTT is placed in the core and the low-viscosity component PET is placed in the sheath. Further, the longer the distance between the centers of gravity of the respective components in the fiber cross section, the higher the coil expression ability and the better the stretchability. The core component may be partially exposed on the fiber surface.

The composite ratio between the two components suppresses the spinnability, the dimensional stability, and the change with time of the yarn.
And PTT: PET = 70: 30 to 35:65 are preferable, and the range of 60:40 to 45:55 is more preferable.

The multifilament yarn of the present invention has a yarn bundle diameter ratio of 50 to 95% and a residual torque twist number of 0 to 5 times /
It is 50 cm.

The yarn bundle diameter ratio is calculated by actually measuring the yarn bundle diameter from a side photograph of the multifilament yarn. A yarn bundle diameter ratio of 100% means that the yarn is completely opened and the coil phase is dispersed. The state of 50% means that about half the fibers are opened compared to the completely opened state, and below 50% indicates that the yarn bundles are focused and the coil phases are aligned. The yarn bundle diameter ratio is measured by the following method.

The polyester composite multifilament yarn of the present invention was hung with a constant load of 0.11 cN / dtex, and after unloading, with an initial load of 0.0022 cN / dtex hung, it was attached to a vertical and horizontal frame of 5 cm each. Use as an attached sample. The sample attached to the frame is photographed with a universal projector with a side photograph of the transmission yarn enlarged 10 times. The yarn bundle diameter at a certain position within 5 cm in this photograph was measured, and d1 shown in FIG.
In addition, the maximum diameter of the coil in 5 cm is measured and designated as d2 shown in FIG. 1 (a).

Thread bundle diameter ratio (%) = (d1 / d2) × 100 Calculate as

On the other hand, the residual torque twist number of the multifilament yarn of the present invention is in the range of 0 to 5 turns / 50 cm, and the range in which almost no torque is generated is most preferable. When the residual torque twist number is 30 to 50 times / 50 cm or more, handling of the yarn in the weaving and knitting process becomes difficult and a tool such as a torque stopper is required, which is not preferable.

The method for measuring the residual torque twist number is as follows.

0.11 in the multifilament yarn of the present invention
Suspend a load of cN / dtex, sample a horizontal length of 1 m, and temporarily fix. A small load of 0.4 cN is hung in the center of the trial length, and when both ends of the trial length are moved to the center, the small load rotates. At this time, the rotating speed is read by a twisting machine.

Residual torque twist number = R (times / 50 cm) Calculate as

In the cross-sectional shape, the multifilament yarn of the present invention generally has a problem that a deformed cross section causes a "rough" feeling, a "bulging" feeling, and a reduction in elongation recovery. A round shape is preferable if possible, and the degree of cross-section deformation r
Therefore, the range of 1.0 ≦ r ≦ 1.5 is preferable,
The range of 1.0 ≦ r ≦ 1.2 is more preferable.

The method of measuring the cross-section deformation degree r is as follows. As shown in FIG. 1E, the major axis La and the minor axis Lb of the cross-sectional shape are measured and calculated by the following formula.

Degree of cross-section deformation r = La / Lb For example, a round cross-section is La = Lb, so 1.0.
The larger the degree of deformation, the larger the numerical value.

Another characteristic of the multifilament yarn of the present invention is that the elongation elastic recovery rate in the elastic region of 10 to 30% is in the range of 70 to 98%, and the PET / P of the prior art is used.
The viscosity of ET [η] IV is higher than that of a bimetallic composite yarn or a single yarn of 100% polybutylene terephthalate (hereinafter referred to as PBT).

Next, a method for producing the polyester composite multifilament yarn of the present invention will be described. One is PT
A polyester mainly composed of T, and the other polyester mainly composed of PET, which is a polyester composite multi-ply for twisting and untwisting a multi-filament yarn compounded in a side-by-side type or an eccentric core-sheath type in the fiber length direction. This is a method for producing filament yarn.

Regarding the method for producing the above-mentioned multifilament yarn, it is a side-by-side or eccentric core-sheath type composite multifilament yarn composed of two kinds of polyester polymers. A polyester mainly composed of PTT is arranged in the polyester polymer A which is a high shrinkage component which causes a coil-like expression effect, and a polyester mainly composed of PET is arranged in the polyester polymer B which is a low shrinkage component, and is discharged. After merging at the upper part of the hole to form a composite flow, it is discharged from a desired sectional die.

In the case of producing a drawn yarn usually called DT, the discharged composite filament yarn is forcibly cooled and solidified, then oiled and taken up by a godet roller and once wound up on an undrawn yarn drum. At this time, the spinning temperature is preferably 245 to 290 ° C,
The temperature is more preferably 280 ° C., and the spinning speed is 1000 to 2500 m / min.

The wound undrawn yarn is wound on a bobbin while being drawn using a hot roller. For example, an undrawn yarn spun at a spinning speed of 1400 m / min is used.
The hot roller can be stretched 3.3 times at 60 to 150 ° C. and wound up to be manufactured.

When a drawn yarn usually called DSD is produced, the spinning speed is 1000 to 2500 m / min.
It is possible to take out the film while pulling it out with a hot roller, and then draw it with a second hot roller by stretching it 3.3 times.

The drawn yarns of DT and DSD obtained in these steps have a substantially round cross section with a small degree of cross-section deformation,
It already has a thread form in which the phases of the coils are aligned.

A method of twisting and untwisting using the above-mentioned drawn yarn will be described in detail according to the manufacturing process shown in FIG.

By unwinding the multifilament yarn 1 of the present invention, twisting and untwisting is performed in the false twist twister 3 between the feed roller 2 and the take-up roller 4, and the cheese 6 is wound up by the take-up roller 5. The polyester composite multifilament yarn of the present invention can be manufactured.

When the yarn is unwound, the multifilament yarn 1 is already aligned in the coil phase of the single fiber filaments, so that excessive untwisting and tail transfer failure are likely to occur, thus improving process passability. Requires a torque stop.

Heat treatment is not essential in twisting and untwisting, but in order to reduce the shrinkage ratio of the obtained multifilament yarn and to improve the workability of twisting and untwisting, the twisting or untwisting is performed. Heat treatment may be performed later. However, since the false twist crimping is imparted at a temperature equal to or higher than the glass transition point, it must be taken into consideration because the texture and the dyeability are different.

For example, in the case of polyester-based composite filament yarn, if the heat treatment temperature is set to 140 to 200 ° C.,
Although a crimped yarn can be obtained and the application as a crimped yarn can be expanded, the temperature must be taken into consideration in the heat treatment because it leads to a decrease in gloss and drapability or an increase in manufacturing cost.

The twisting number is 20 at 50 dtex.
00-4500 T / m, 1500-4 at 75 dtex
1000-3000 at 000 T / m and 150 dtex
A range of T / m is suitable. Generally, a large number is preferable, but the number may be small as long as the number of single fiber filaments increases.

The heat treatment may be carried out before twisting, during twisting, or after twisting, but when using a usual false twisting equipment, it is carried out during twisting or after twisting. .

The heat treatment means is a plate heater, a hollow heater, a hot pin, a hot roller, a saddle type heater, or the like. Further, the false twist twister may be any of spindle type, friction type, belt nip type, kennel type and the like.

The above production example is a method for producing a polyester composite multifilament yarn of the present invention by once producing a drawn yarn called DT or DSD and then subjecting it to twisting and untwisting in a separate step. It is possible to rationally manufacture by incorporating a twisting-untwisting step in the process.

For example, when producing a drawn yarn of DT, twisting and untwisting may be carried out during or after the drawing and wound as a DT around a pan or the like. Similarly, when a drawn yarn of DSD is produced, twisting and untwisting may be performed during or after the drawing, and wound as a DSD into a parn or the like.

Applications using the polyester composite multifilament yarn of the present invention include stretch fabrics for ladies and gentlemen, materials such as linings, interwoven fabrics / twisted products with natural fibers, and wetsuits / swimsuits for sports. It can be applied to athletics, other nursing care products, baby products, etc.

[0046]

EXAMPLES [Example 1] PTT / PET weight% 50: 5
0 bimetallic round cross-section composite multifilament yarn, bright / semi-dull type, spinning speed 1350m / mi
n, spinning temperature 275 ° C., spinning, draw ratio 3.2
Polyester composite multifilament yarn 56dte with 9-fold drawing and hot roller temperature 70-120 ° C
The x24 filament was wound on a bobbin. The coil phase of the filament yarn had already been bundled and was in a uniform bundle state. The multifilament yarn is processed with a triaxial fiction twister at a processing speed of 400 m / min,
A twisting-untwisting process was performed at a twisting number of 3200 T / m and a room temperature of 25 ° C.

Using the multifilament yarn, a warp yarn was used as a PET 55 dtex and a 24-filament yarn weft yarn to produce a plain woven fabric. The fabric is dyed at a temperature of 11
It was dyed with a disperse dye at 0 ° C and finished at 150 ° C. The results are shown in Table 1.

[Example 2] PTT / PET weight% 50:
50 bimetallic round cross-section composite multifilament yarns of bright / semi-dal type were spun at a spinning temperature of 280 ° C., and 1100 m / mi with a first hot roller of 70 ° C.
n, and with a second hot roller at 150 ° C., 4200 m / min and a draw ratio of 3.82 times,
Polyester composite multifilament yarn 56dtex,
Twenty-four filaments were wound on bobbins. The coil phase of the filament yarn had already been bundled and was in a uniform bundle state. The multifilament yarn was twisted and untwisted using a triaxial fiction twister at a processing speed of 400 m / min, a twisting number of 3200 T / m, and a room temperature of 25 ° C. The same weaving and dyeing finishing processes as in Example 1 were performed. The results are shown in Table 1.

Comparative Example 1 PTT / PET weight% 50:
50 bimetal cross-section deformation degree r = 1.6 mushroom type cross-section composite multi-filament yarn bright / semi-dal type, spinning speed 1350 m / min, spinning temperature 269
Spinning was carried out at a temperature of .degree. C., a draw ratio of 3.12, and a hot roller temperature of 70 to 130.degree. The coil phase of the filament yarn has already been shifted, and the yarn bundle was in an opened state. The same weaving and dyeing finishing processes as in Example 1 were performed. The results are shown in Table 1.

[0050]

[Table 1]

[0051]

EFFECTS OF THE INVENTION The polyester composite multifilament yarn of the present invention has a round cross section, but each single fiber filament yarn is opened and migrated. Because they are dispersed,
In the product, "irritability", wrinkles and wrinkles are completely eliminated, and the problem is solved.

Since the cross-sectional shape is almost round, there is no "grainy" feeling in the product and no "glittering" in luster, and the expansion / contraction elastic properties are also high.

Since the twisting-untwisting process is performed, some false twist crimping is provided, but since the latent crimping effect is increased by the bimetal structure, the crimping pitch of the coil is further miniaturized. Since a very fine crimped yarn can be obtained, the product has a soft and smooth feel.

Further, since the migration between the single fiber filaments is promoted by the twisting-untwisting action, "sink" and yarn unevenness which are considered to occur in the drawing process of the raw yarn are made mild, and the dyeing difference after the dyeing process is made. Will not occur.

Although twisting-untwisting processing is performed, when heat treatment is performed, the heat treatment temperature is below the glass transition point, and residual torque hardly occurs. Therefore, excessive twisting and tail transfer in the creel are performed. The problem of defects is improved.

[Brief description of drawings]

FIG. 1 (a) is a yarn form schematic diagram showing an example of a polyester composite multifilament yarn constituting the present invention,
(B) is a yarn form schematic diagram showing an example of the drawn yarn of the polyester composite multifilament yarn, and (C) is (a).
1A-1A 'in Fig. 1, (d) shows a cross-sectional view in 1B-1B' in (b), and (e) shows the relationship between the major axis and the minor axis of the modified cross-section yarn.

FIG. 2 is a process drawing showing an example of a process for producing a polyester composite multifilament yarn of the present invention.

[Explanation of symbols]

1: Stretched yarn of polyester composite multifilament yarn 2: Feed roller 3: Heat setting part 4: False twist twister 5: Take-up roller 6: Take-up roller 7: Rolled cheese

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Claims (5)

[Claims] 1. A multifilament in which one component is a polyester mainly composed of polytrimethylene terephthalate, and the other component is a polyester mainly composed of polyethylene terephthalate, which is a side-by-side type or an eccentric core-sheath type composite in the fiber length direction. The polyester composite multifilament yarn is characterized in that the yarn bundle diameter ratio of the multifilament yarn is 50 to 95% and the residual torque twist number is 0 to 5 times / 50 cm. 2. A degree of cross-sectional deformation r of the multifilament yarn
Is 1.0 ≦ r ≦ 1.5.
The polyester composite multifilament yarn according to. 3. A multifilament in which one component is a polyester mainly composed of polytrimethylene terephthalate, and the other component is a polyester mainly composed of polyethylene terephthalate, which is a side-by-side type or an eccentric core-sheath type composite in the fiber length direction. A method for producing a polyester composite multifilament yarn, which comprises twisting and untwisting the yarn. 4. The method for producing a polyester composite multifilament yarn according to claim 3, wherein the twisting and untwisting is performed by heat treatment. 5. The temperature of the heat treatment among the two components
5. The method for producing a polyester composite multifilament yarn according to claim 4, wherein the glass transition point of the low temperature side polyester is set to room temperature.