JP3042938B2 - Polyester multifilament yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polyester multifilament yarn. In detail, the thick and small spots are randomly and variably distributed throughout the yarn in a short cycle, and as a result,
Extremely excellent surface effect of natural non-artificial heather tone,
The present invention relates to a polyester multifilament yarn which can have an appearance, a color tone, a feeling, and the like, and a fabric comprising the same.

[0002]

2. Description of the Related Art Polyester multifilament yarns are characterized by a high degree of uniformity, but when turned upside down, they have little change, have artificial coldness, and are flat when woven or knitted. The color tone is not deep and the texture tends to be inferior.

[0003] In order to improve the above-mentioned drawbacks of the polyester multifilament yarn and provide the polyester multifilament yarn with a spun yarn-like appearance and feeling, portions having different yarn diameters in the length direction are provided. Various so-called thick and thin yarns have been developed, and this yarn is usually obtained by drawing an undrawn yarn of polyester at a low draw ratio. This thick and thin yarn is composed of a thick dyed unstretched portion with a large yarn diameter and a light-colored stretched portion with a small yarn diameter. It has a problem that it is easy to be caused, and it is excessively hardened to deteriorate the feeling. In addition, the unstretched part of the deep dyeing and the stretched part of the light dyeing are located at the same position of the yarn along the length direction of the yarn, so that the heather tone becomes extremely strong and a natural heather tone is obtained. Has the disadvantage that it cannot be performed.

As a method for solving the above-mentioned drawbacks of thick and thin yarn, (1) an undrawn portion of 3 cm or less is randomly left in the length direction of each filament constituting a polyester multifilament yarn. At least three undrawn portions are dispersed and present per 10 cm in the length direction of the multifilament yarn (Japanese Patent Publication No. 51-72).
No. 07), (2) Undrawn multifilament yarn in which inorganic particles having an average particle size of 0.9 to 1.8 μ are uniformly dispersed at a ratio of 0.5 to 2.5% by weight is drawn unevenly. (3) a single fiber containing 1% by weight or more of titanium oxide and having a fineness ratio of 2 or more;
A multifilament yarn in which the value P50 of a cycle of ₅₀ cm on a spectrograph in a normal test is 0.5 or less of the maximum value Pmax of the cycle (Japanese Patent Laid-Open No. Sho 62).
-85021) and the like.

[0005] However, in the multifilament yarn of (1), although the undrawn portion is randomly present in the yarn, it is as if the undrawn portion overlaps in the whole yarn and there is a long spot. It becomes a strong heather tone, and the diversification of spots necessary to express a natural heather tone is insufficient, and it is not satisfactory enough.

In the multifilament yarn of the above (2), in the case of a high-count yarn having a small single fiber fineness, for example, a polyester yarn having a single fiber fineness of 1 d (about 10 μm in diameter), the average particle size of the inorganic fine particles is small. It has a drawback of frequently breaking during spinning and drawing due to its large size of 0.9 to 1.8 μm. On the other hand, in the case of a yarn having a large single fiber fineness, the amount of inorganic fine particles added is small and the dispersion of the drawing point is small. Because it is unlikely to occur, it will be a relatively long gathered heather, not a natural heather. Moreover, irrespective of the size of the single fiber fineness, the amount of the inorganic fine particles added is small, so that the yarn cannot be provided with drapability.

Further, in the multifilament yarn of the above (3), the undrawn portion is randomly present in each filament constituting the yarn, and the degree of dispersion of the undrawn portion is larger than that of the filament yarn of the above (1). Although such filaments have been improved, when such filaments are aggregated into yarn, the undrawn portion is averaged within the yarn, and the diversification of spots necessary to express natural heather is still Insufficient.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a spun yarn made of natural fibers having moderate and diversified spots without having a heather tone that is too strong or too weak. An object of the present invention is to provide a polyester multifilament yarn having a natural and good depth surface effect, especially a heather tone, and a fabric made thereof.

[0009]

Means for Solving the Problems The present inventors have repeatedly studied to solve the above problems. As a result, a multifilament yarn is formed from a polyester containing 4 to 10% by weight of inorganic fine particles having an average particle diameter of 0.9 μm or less, and each filament constituting the yarn is a spot filament having fine and fine spots. The present inventors have found that the above object can be achieved by distributing the thick and fine spots in a state different from those in the above-mentioned conventional techniques (1) to (3) and dispersing them in yarn, and completed the present invention.

That is, according to the present invention, the average particle size is 0.9 μm.
A polyester multifilament yarn containing 4 to 10% by weight of inorganic fine particles of not more than m, wherein each filament constituting the yarn has a thick and thin spot in the length direction, and in the spectrograph of the yarn, Satisfy;

[0011]

[Number 1] _{P 03 / Pmax ≧ 0.5 P 50} / Pmax ≧ 0.5 P 100 / Pmax ≦ in 0.5 formula, P _03: the period of the spectrograph in the normal test 3
Value in cm P ₅₀ : Period 5 on spectrograph in normal test
A value at 0 cm P ₁₀₀ : a value at a period of 100 cm on a spectrograph in a normal test P max: a maximum value on a spectrograph at a normal test P ₁₀₀ : a polyester multifilament yarn and a fabric comprising the filament yarn. .

The above-mentioned spectrograph in the present invention is:
It means a Worcester spectrograph developed by Zuervega of Switzerland. In the present invention, the above-mentioned P ₀₃ , P ₅₀ , P
Both ₁₀₀ and Pmax in the normal test
It is a value measured at a yarn feed speed of 25 m / min and a chart range of 25%. This spectrograph is an effective means for knowing the pitch of yarn spots, and details thereof are described in "Theory and Practice of Unevenness", pp. 255-372 (published by Japan Society of Textile Machinery).
It is described in.

FIG. 1 shows a spectrograph obtained by a normal test for the multifilament yarn of the present invention. The multifilament yarn of the present invention has a value at a period of 3 cm (P ₀₃ ) and a value at a period of 50 cm on the spectrogram. All values obtained by dividing (P ₅₀ ) by the maximum value (Pmax) are 0.5 or more. That is, in the multifilament yarn of the present invention, P ₀₃ /Pmax≧0.5 and P ₅₀ / Pmax ≧
By satisfying 0.5, it can be seen that spots of various periods are randomly distributed in the length direction of the filament.

Further, the multifilament yarn of the present invention is:
Period 1 on spectrograph obtained by normal test
The value obtained by dividing the value of (P ₁₀₀₎ with a maximum value (Pmax) at m is 0.
It is necessary to be 5 or less. Ultra-long period spots with a period of 1 m are formed by an extremely large number of short-period spots gathering. In such an extremely long-period spot, the strength of the yarn is extremely reduced, and the handling property is extremely high. However, in the multifilament yarn of the present invention, such an undesired ultra-long cycle spot is reduced by the P ₁₀₀ / P max ≦ 0.5, and the multi-filament yarn of the present invention is also mechanically disadvantageous. Has good characteristics.

Then, taking the above description into account, P ₀₃ ,
The multifilament yarn of P ₅₀ and P ₁₀₀ satisfies the condition present invention of formula ~ described above, various FutoshiHoso plaques from FutoshiHoso plaques extremely short period until FutoshiHoso plaques slightly longer short period exists to the filaments It can be understood that these spots are moderately dispersed without excessively gathering at a specific portion in the entire yarn, so that a natural heather tone can appear as the entire yarn. In the multifilament yarn of the present invention, among the conditions of the above-mentioned formulas (1) to ( ₃₎ , particularly, P ₀₃ / P
max ≧ 0.6, P ₅₀ / Pmax ≧ 0.55 and P ₁₀₀ /
More preferably, Pmax ≦ 0.45.

The polyester multifilament yarn satisfying the above-mentioned condition (1) has an average particle size of 0.9 μm.
Using a polyester containing 4 to 10% by weight of the following inorganic fine particles, a polyester filament yarn which is an aggregate of a filament group having a predetermined single fiber fineness is produced,
It can be obtained by spot stretching at a low stretching ratio. That is, it can be obtained by spinning and drawing using a polyester containing inorganic particles having a small average particle size of 0.9 μm or less in a relatively large amount of 4 to 10% by weight. Are also different from the above-mentioned conventional techniques (1) to (3). Although the reason is not clear, spinning in a state where a large amount of inorganic fine particles are present in the polyester produces a filament yarn having voids called voids, and this filament yarn (undrawn yarn) is drawn at a low draw ratio. Then, it is presumed that the voids randomly change the drawing point and generate thick and thin spots having various length cycles in the drawn yarn.

In particular, in order to obtain a polyester filament yarn satisfying the requirements of the above formulas (1) to (4), it is preferable that the filament yarn is a denier mixed filament yarn obtained by combining a plurality of types of thick and thin filaments having different denier numbers. In that case, the denier mix filament yarn is a combination of two kinds of denier filaments,
Alternatively, a combination of three or more denier filaments may be used.

When the polyester filament yarn of the present invention is composed of such a denier mixed filament yarn, the average denier is particularly 1.5 d / f or less, preferably the average denier is about 0.5 to 1.5 d. / F
Denier obtained by combining a fine denier filament having a thick and fine spot with a thick denier filament having a thick and thin spot having an average denier of 4.0 d / f or less, preferably an average denier of about 2.5 to 4.0 d / f. When a mixed filament yarn is used, a polyester filament yarn satisfying the requirements of the above formulas (1) to (4) can be obtained smoothly. At this time, the ratio of fine denier filaments: thick denier filaments in one polyester filament yarn is not limited to 50 to 70:50 by weight.
It is preferable to set it to about 30. Also, generally, the total number of filaments per yarn is set to about 10 to 200 f.
It is preferable from the viewpoint of handleability when manufacturing a woven or knitted fabric or the like.

In the case of a polyester multifilament yarn comprising filaments of a single fineness, the average particle size is 0.9.
Even when 4 to 10% by weight of inorganic fine particles having a particle size of μm or less are contained, in many cases, any one of the requirements of the above formulas (1) to (5) is not satisfied. For example, using a large titanium oxide having an average particle size of about 1.0 μm to produce a single-filament multifilament yarn (undrawn yarn) having a relatively small single-filament fineness,
In the case of uneven stretching, voids are easily generated due to the large influence of the inorganic fine particles, and random stretching is also likely to occur. Therefore, as shown in the spectrograph of FIG. It is likely to cause plaques including spots, where P ₀₃ /Pmax=0.62 and P ₅₀ /Pmax=0.6
7, a P ₁₀₀ /Pmax=0.55, very long period of more periodic 1m also unevenness there are many. Such a mottled yarn has a very poor process passage property, and the heather appearance in the case of a woven or knitted fabric appears in a short cycle and is not good.

On the other hand, when a single-filament multifilament yarn (undrawn yarn) having a sufficiently large single-filament size with respect to the average particle size is produced and spot-drawn, the influence of inorganic fine particles is small. Voids are hardly generated, and the period of the plaque becomes long and almost single. As shown in the spectrograph of FIG. 3, P ₀₃ /Pmax=0.08 and P ₅₀ / Pmax = 0.
53, P ₁₀₀ /Pmax=0.31. Since this mottled yarn has a large peak at a cycle of about 60 cm, the mottles of other cycles are not conspicuous at all, and the varieties of the mottles are extremely insufficient, which is not preferable. It becomes a heather tone.

Even when a denier mixed filament yarn is used, a simple combination of a filament with a large single fiber fineness and a filament with a small single fiber fineness cannot provide the multifilament yarn of the present invention. For example, single fiber fineness 1 for soft touch
co-spinning filaments of d of the filament and hips strong fiber fineness 6d, even if low-stretch as FutoshiHoso plaques occurs, as shown in spectrograph of Figure 4, P ₀₃ / P
_{max = 0.34, P 50 /Pmax=0.55,P 100} / Pmax
= 0.25, and the effect of the filament having a large single fiber fineness is too large in this mottled fiber, and the period is about 60 cm.
, The unevenness of other periods is not conspicuous at all, and the diversity of the unevenness is extremely insufficient, which is not preferable.

In the case of a multifilament yarn composed of filaments having a single fineness, the cycle of large and thin spots is widened in a multifilament yarn having a small single fiber fineness, and the spots in a woven or knitted fabric have a short cycle. In a multifilament yarn having a large fiber fineness, the cycle of the large and thin spots is long and single.
On the other hand, in the case of the denier mix multifilament yarn in which filaments of different finenesses are combined, the cycle of the filaments having a small single-filament fineness becomes longer, and the filaments having a large single-filamentity fineness have a surprisingly long period. And the phenomenon is opposite to that of a multifilament yarn having a single fineness, but the reason is unknown. However, such a phenomenon in the denier mix multifilament yarn promotes the diversification of large and thin spots,
The polyester multifilament yarn of the present invention satisfying the requirements of the above formulas (1) to (4) can be obtained for the first time.

As the polyester constituting the polyester multifilament yarn of the present invention, any polyester which can be generally used for producing polyester fibers can be used, and polyethylene terephthalate, polybutylene terephthalate, or ethylene terephthalate units and / or butylene is used. It is preferable to use a copolyester or the like obtained by copolymerizing a terephthalate unit as a main constituent unit with a small amount of another copolymer component.

In the above, in the case of a copolyester mainly containing ethylene terephthalate units and / or butylene terephthalate units, isophthalic acid, 5-metal sulfoisophthalic acid, phthalic acid,
Aromatic carboxylic acid components such as 6-naphthalene dicarboxylic acid, oxalic acid, adipic acid, azelaic acid, aliphatic carboxylic acid components such as sebacic acid, trimellitic acid, polyfunctional carboxylic acid components such as pyromellitic acid, diethylene glycol, Propylene glycol, butanediol or ethylene glycol, polyethylene glycol, glycerin, pentaerythritol and the like can be used.

When the yarn is dyed, the thick part (undrawn part) of the filament is dyed dark, the details (drawn part) are dyed light, and the void-rich part looks like light dye, The part with few voids looks like a deep dye. Further, in the denier mixed filament yarn, the thick denier filament becomes deeply dyed and the fine denier filament becomes lightly dyed. As a result, the thick portion of the thick denier filament and the portion with few voids have the deepest dyeing state, and the detail of the fine denier filament and the portion with many voids have the lightest dyeing state. By the way, in the polyester filament yarn of the present invention, the thickness of the filament and the number of voids are extremely varied in any one cross section of the yarn, and the period (phase) is shifted in the length direction of the yarn. Because it is finely dispersed, when dyed, the shade is dispersed very finely and uniformly and shows a natural and high-quality finish of solid color heather while being random, and at this point the difference in shade appears on the surface It is very different from conventional yarns dyed in color heather.
Further, the polyester multifilament yarn of the present invention,
If necessary, a confounding process may be performed by air confounding or another method.

The following method can be mentioned as a specific method for producing the polyester multifilament yarn of the present invention. However, it is of course not limited to that,
Any polyester multifilament yarn having the above-mentioned requirements of the present invention is included in the present invention.

The polyester multifilament of the present invention
Production example of yarn : (1) Average particle size is 0.9 μm or less, preferably 0.0 μm
For example, a polyester or copolyester containing 4 to 10% by weight of fine particles of 5 to 0.8 μm is discharged from a split die having different numbers of holes as shown in FIG. , Preferably 1500 to 2500 m
/ Min, more preferably at a spinning speed of 1800-2200 m / min to produce a denier mix polyester filament yarn.

In the spinning operation (1), generally,
If the average particle size of the inorganic fine particles exceeds 0.9 μm, the spinnability becomes extremely poor, while the average particle size of the inorganic fine particles is 0.05
When the diameter is extremely small as less than μm, voids are less likely to be generated in the filament during spinning and drawing, and random fluctuation of the drawing point is less likely to occur, so that thick spots with various periods are less likely to be generated. When the content of the inorganic fine particles is less than 4% by weight, large and thin spots do not appear randomly in a short period of the filaments constituting the yarn. On the other hand, when the content is more than 10% by weight, spinnability is reduced and operability is poor. It will be. And, fine particles suitable for use in the present invention include barium sulfate, silica, calcium carbonate, magnesium oxide, alumina, titanium oxide and the like.
In particular, it is not clear whether barium sulfate is used to form secondary particles (agglomerates) during the manufacturing process or because the true specific gravity is as large as 4.49 and the dispersion state in polyester is poor. It is preferable because voids are easily generated, random dispersion of the drawing points can be obtained, and a diversified thick and thin spot period can appear on the yarn.

When producing a denier mixed filament yarn, a method may be employed in which filaments having different denier numbers are separately spun instead of directly spinning and then combined in the drawing step. Direct spinning using the same spinneret is preferable in terms of production efficiency and is desirable.

On the other hand, if the spinning speed is less than 1500 m / min, the strength becomes insufficient when fabric is used, while the spinning speed is 2 m / min.
If it exceeds 500 m / min, care must be taken because the occurrence of spots and voids after stretching becomes insufficient, and it becomes difficult to obtain the desired polyester multifilament yarn. Many conventional thick and thin yarns have 150
Although a spinning speed of 0 m / min or less has been employed, in the case of the present invention, even if a spinning speed of 1500 to 2500 m / min is employed, a desired yarn can be produced.

In this spinning operation, as described above, the average denier of the fine denier filaments becomes 1.5 d or less after the stretching treatment of the following (2), and the average denier of the thick denier filaments becomes the stretching of the following (2). The spinning is preferably carried out so as to be 4.0d or less after the treatment and to account for 50% by weight or more of the ratio of fine denier filaments in the multifilament yarn after the drawing. When the average denier of the fine denier filament and the thick denier filament and the ratio of the fine denier filament in the multifilament yarn deviate from such ranges, the cycle of the thick and fine spots in the filament becomes longer, and the above-mentioned requirement in the present invention is satisfied. It is difficult to obtain a yarn with

At the time of spinning, the coefficient of friction (particularly FF) is adjusted so that the drawing points of the filaments are dispersed and dispersed (so that dispersion drawing is performed) during the drawing process (2) below.
It is desirable to use an oil agent having a low dynamic coefficient of friction (dynamic friction coefficient), and the amount of the oil agent applied at that time is preferably 0.8% by weight or more.
When the amount of the oil agent is less than 0.8% by weight, the thick and thin cycle of each filament is likely to be long, and it is difficult to obtain a plaque in which thick and fine spots are finely dispersed.

(2) Next, the polyester multifilament yarn obtained in the above-mentioned spinning step is preheated at a low temperature, then stretched, and then heat-set, whereby the target polyester spot drawn yarn can be obtained. In that case,
Preheating is preferably performed at a temperature of about 35-55 ° C. When the preheating temperature exceeds 55 ° C., the cycle of the thick and thin spots in each filament becomes longer and the stability of the spots tends to be lacking. On the other hand, when the preheating temperature is less than 35 ° C., the thick and thin spots fluctuate depending on the season and the quality is constant. It is hard to become. The heat setting temperature is
The higher the value, the better the elongation is reduced, but at the same time, the strength of the yarn is also reduced. The stretching ratio is calculated by the following formula:

[0034]

## EQU00002 ## Stretching ratio = {(D / 100) +1} .times. (0.5-0.6) In the formula, it is preferable that D = elongation at break of multifilament yarn.

The polyester multifilament yarn of the present invention can be formed into various types of woven or knitted fabrics similarly to ordinary polyester multifilament yarns, and is particularly suitable for woven or knitted clothing. The woven or knitted fabric produced from the polyester spot stretched yarn of the present invention is natural, rich in variability and diversity, and has a good and deep color tone, appearance, texture, touch, and the like that can be used for a long time. The dyed product has a good solid heather color tone without color spots. In that case, the dyeing may be performed at the yarn stage or after forming the woven or knitted fabric.

[0036]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

Example 1 (1) Polyethylene terephthalate of [η] = 0.65 containing 5% by weight of barium sulfate having an average particle size of 0.58 μm was divided into a split die as shown in FIG. In the first embodiment, a base of 16 holes on the left side and 36 holes on the right side are used.)
And a spinning speed of 1800 m / min. And an oil agent (yarn-yarn kinetic friction coefficient of 0.29) was spun under the condition of an adhesion amount of 0.9% by weight, and a filament group of 90d / 16f and 90d / f
An undrawn polyester denier mixed multifilament yarn (180d / 52f) having a breaking elongation of 235% and a birefringence of 16 × 10 ⁻³ was obtained from the 36f group.

(2) Next, the undrawn yarn obtained in the above (1) is preheated at a hot roller temperature of 50 ° C., then drawn at a draw ratio of 1.81 times, and heat set at a hot roller temperature of 130 ° C. A book consisting of 100d / 52f polyester denier mix multifilament drawn yarn of 50d / 16f filament group (single fiber fineness 3.1d) and 50d / 36f group (single fiber fineness 1.39d) An inventive polyester multifilament yarn was obtained.
P ₀₃ /Pmax=0.68 of this multifilament yarn,
Is a P ₅₀ /Pmax=0.59,P ₁₀₀ /Pmax=0.40, I was happy with all of the requirements of - the above formula. When a woven fabric was produced using this multifilament yarn, it had a natural heather-like surface effect.

Example 2 (1) Polyethylene terephthalate of [η] = 0.64 containing 8% by weight of barium sulfate having an average particle size of 0.41 μm was divided into a split-type base as shown in FIG. In the second embodiment, a base with 12 holes on the left side and 36 holes on the right side is used.)
And a spinning speed of 1800 m / min. And an oil agent (yarn-yarn dynamic friction coefficient: 0.29) was spun under the condition of an adhesion amount of 0.9% by weight, and a 70d / 12f filament group and 70d / f
An undrawn polyester denier mixed multifilament yarn (140d / 48f) having a breaking elongation of 248% and a birefringence of 16 × 10 ^-3 was obtained from the 36f group.

(2) Next, after preheating the undrawn yarn obtained in the above (1) at a hot roller temperature of 45 ° C., it is drawn at a draw ratio of 1.85 times, and heat set at a hot roller temperature of 130 ° C. A book consisting of a filament group of 38d / 12f (single fiber fineness: 3.2d) and a 38d / 36f group (single fiber fineness: 1.06d) and a woven yarn of 76d / 48f polyester denier mix multifilament drawn yarn An inventive polyester multifilament yarn was obtained. P ₀₃ /Pmax=0.65 of this multifilament yarn, P
Is a ₅₀ /Pmax=0.61,P ₁₀₀ /Pmax=0.44, I was happy with all of the above formula ~ requirements. When a woven fabric was produced using this multifilament yarn, it had a natural heather-like surface effect.

<< Comparative Example 1 >> (1) A polyethylene terephthalate having no [η] = 0.65 containing inorganic fine particles was divided into a die as shown in FIG. 5 (however, in Comparative Example 1, 16 holes on the left side; 36
Spinning speed is 1800
An oil agent (yarn-yarn dynamic friction coefficient: 0.29) was spun under the condition of an adhesion amount of 0.9% by weight, and a 90d / 16f filament group and a 90d / 36f group were plied and broken elongation. Polyester denier mixed multifilament undrawn yarn having a degree of 262% and a birefringence of 16 × 10 ^-3 (180
d / 52f).

(2) Next, the undrawn yarn obtained in the above (1) is preheated at a hot roller temperature of 50 ° C., then drawn at a draw ratio of 1.91 times, and heat set at a hot roller temperature of 130 ° C. To obtain a 94d / 52f polyester denier mix multifilament drawn yarn of 47d / 16f filament group (single fiber fineness 2.9d) and 47d / 36f group (single fiber fineness 1.31d). .
P ₀₃ /Pmax=0.12 of this multifilament yarn,
It is a P ₅₀ /Pmax=0.62,P ₁₀₀ /Pmax=0.32, did not meet the above type of requirement. When a woven fabric was produced using this multifilament yarn, the fabric had an extremely heat-resistant appearance with a period of about 60 cm, and exhibited an artificial, unnatural, and poor surface effect.

<< Comparative Example 2 >> (1) Polyethylene terephthalate of [η] = 0.65 containing 5% by weight of barium sulfate having an average particle size of 0.58 μm was spun from a die having a single pore size. A spinning speed of 1800 m / min and an oil agent (yarn-yarn dynamic friction coefficient of 0.29) was spun under the condition of an adhesion amount of 0.9% by weight.
An undrawn polyester multifilament yarn (140d / 48f) having a birefringence of 5% and a birefringence of 16 × 10 ^-3 was obtained.

(2) Next, after preheating the undrawn yarn obtained in the above (1) at a hot roller temperature of 50 ° C., it is drawn at a draw ratio of 1.91 times, and heat set at a hot roller temperature of 130 ° C. 74d / 48f (single fiber fineness 1.54
A polyester multifilament drawn yarn d) was obtained.
P ₀₃ /Pmax=0.62 of this multifilament yarn,
It is a P ₅₀ /Pmax=0.67,P ₁₀₀ /Pmax=0.55, did not meet the above type of requirement. When a woven fabric was produced using this multifilament yarn, the yarn strength was low and weaving was impossible.

Comparative Example 3 (1) Polyethylene terephthalate having [η] = 0.65 containing 5% by weight of barium sulfate having an average particle size of 0.58 μm was spun from a die having a single pore size. Spin at a spinning speed of 1900 m / min and elongation at break of 262%
And a polyester multifilament undrawn yarn (200d / 48f) having a birefringence of 16 × 10 ⁻³ was obtained.

(2) Next, after preheating the undrawn yarn obtained in the above (1) at a hot roller temperature of 65 ° C., it is drawn at a draw ratio of 2.04 times, and heat set at a hot roller temperature of 130 ° C. 98d / 48f (single fiber fineness 2.04
A polyester multifilament drawn yarn d) was obtained.
P ₀₃ /Pmax=0.08 of this multifilament yarn,
It is a P ₅₀ /Pmax=0.53,P ₁₀₀ /Pmax=0.31, did not meet the above type of requirement. When a woven fabric was produced using this multifilament yarn, the long-period heather was emphasized, and the fabric was artificial and had a poor surface effect.

Comparative Example 4 (1) Polyethylene terephthalate of [η] = 0.65 containing 5% by weight of barium sulfate having an average particle size of 0.58 μm was divided into a split die as shown in FIG. (In the first embodiment, a base with 10 holes on the left side and 48 holes on the right side is used.)
And spinning at a spinning speed of 1800 m / min and an oil agent (yarn-yarn dynamic friction coefficient of 0.29) under the condition of an adhesion amount of 0.9% by weight to obtain a 100d / 10f filament group and 90d
A polyester denier mixed multifilament undrawn yarn (190d / 58f) having a breaking elongation of 255% and a birefringence of 16 × 10 ^-3 was obtained.

(2) Next, after preheating the undrawn yarn obtained in the above (1) at a hot roller temperature of 50 ° C., it is drawn at a draw ratio of 1.85 times, and heat set at a hot roller temperature of 130 ° C. To obtain a combined polyester / denier mixed multifilament drawn yarn of 103d / 58f of 54d / 10f filament group (single fiber fineness: 5.4d) and 49d / 48f group (single fiber fineness: 1.02d). . P ₀₃ /Pmax=0.3 of this multifilament yarn
4, P ₅₀ /Pmax=0.55,P ₁₀₀ /Pmax=0.25
And did not satisfy the requirements of the above formula. When a woven fabric was produced using the multifilament yarn, a woven fabric having an artificial and poor surface effect in which a long-period heather tone was emphasized was obtained.

[0049]

According to the polyester multifilament yarn of the present invention, the thick and fine spots are randomly and variably distributed throughout the yarn in a short cycle, and as a result, the surface is excellent in natural non-artificial natural heather. It has effects, appearance, color tone, hand, etc.

[Brief description of the drawings]

FIG. 1 is a diagram showing a spectrograph of a polyester multifilament spot drawn yarn of the present invention.

FIG. 2 is a view showing a spectrograph of a polyester multifilament spot drawn yarn other than the present invention.

FIG. 3 is a diagram showing a spectrograph of another polyester multifilament spot drawn yarn other than the present invention.

FIG. 4 is a view showing a spectrograph of yet another polyester multifilament spot drawn yarn other than the present invention.

FIG. 5 is a view showing an example of a spinneret used for producing the polyester spot drawn yarn of the present invention.

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI D02J 1/06 D02J 1/06 (56) References JP-A-59-94617 (JP, A) JP-A-62-85021 (JP) , A) Japanese Patent Publication No. 51-7207 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) D02G 3/00 D01F 1/10 D01F 6/62 D01F 6/92 D02J 1/06

Claims (3)

(57) [Claims] 1. A polyester multifilament yarn containing 4 to 10% by weight of inorganic fine particles having an average particle size of 0.9 μm or less, wherein each filament constituting the yarn has a thick and thin spot in a length direction, In the spectrograph of the yarn, the following formulas are satisfied: P ₀₃ /Pmax≧0.5 P ₅₀ /Pmax≧0.5 P ₁₀₀ /Pmax≦0.5 In the formula, P ₀₃ : a spectrograph in a normal test Period 3 on graph
Value in cm P ₅₀ : Period 5 on spectrograph in normal test
A value at 0 cm P ₁₀₀ : a value at a period of 100 cm on a spectrograph in a normal test P max: a maximum value on a spectrograph in a normal test 2. The polyester multifilament yarn according to claim 1, wherein the inorganic fine particles are barium sulfate. 3. A fabric comprising the polyester multifilament yarn of claim 1 or 2.