JP3447866B2 - Polyester multilayer yarn with excellent lightweight warm feeling - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester multi-layer structure yarn which is lightweight and has an excellent warm feeling.

[0002]

2. Description of the Related Art Conventionally, a method of interlacing two or more kinds of polyester multifilament yarns having different cutting elongations (hereinafter referred to as "elongation") and then stretching and false twisting them has been known.
Well-known and bilayer structured yarns have been produced with various characteristics. However, the bulkiness of these two-layer structure yarns is due to the difference in the length of the core component and the sheath component generated from the twist structure due to false twist and the form of crimp, and is certainly higher than that of the single false twist yarn. Although it has a high span feel and is bulky, it is still not enough when it comes to a lightweight warm feeling. In other words, the crimp due to the twisting tends to make the crimp pitch fine and uniform. For this reason, the voids between fibers are also fine, and it is difficult to obtain a fluffy and airy bulkiness, or the cross-sectional deformation is likely to be large, and therefore, there is a drawback that the touch becomes rough and a smooth soft touch cannot be obtained. is doing.

In order to solve such a problem, two or more kinds of polyester multifilament yarns having different elongations are entangled with each other and then drawn and false twisted at a temperature of 120 ° C. or less to give an extremely soft feeling. A polyester blended yarn and a method for producing the same have been proposed which are capable of producing a woven fabric having a high resilience (Japanese Patent Laid-Open No. 2-293428).
(See Japanese Patent Publication). However, according to this method, a soft texture is certainly obtained, but on the other hand, since it becomes a flat yarn form, sufficient bulkiness cannot be obtained, and it is not suitable for the intended use of the present invention. Turned out not.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above problems of the prior art and to provide a large amount of voids between the fibers constituting the yarn to make the polyester lightweight and excellent in warm feeling. It is to provide a multi-layered structure yarn.

[0005]

The present invention is directed to a polyester multifilament yarn (1) having a low elongation and a polyester multifilament yarn having a high elongation which is three times or more the elongation of the yarn (1). In the multi-layer structure yarn in which the fineness variation is formed in a part of the constituent single fibers of the yarn arranged in the sheath by entanglement of the yarn (2) and then simultaneously false-twisting, the yarn constituting the core (1) is the following (a), and the yarn (2) constituting the sheath is the following (b), (c),
It is a polyester multi-layer structure yarn excellent in lightweight warmth, which satisfies (d) at the same time. (A) Shrinkage rate of boiling water is 10% or more, and after boiling water treatment 1
Polyester multifilament yarn obtained by copolymerizing an isophthalic acid component that further shrinks when heat-treated at 30 ° C or higher. (B) A polyester multifilament yarn that self-expands in the longitudinal direction of the fiber by a heat treatment at 130 ° C. or higher after boiling water treatment. (C) A polyester multifilament yarn having a difference in fineness in the length direction of the fiber, and a shrinkage difference due to boiling water treatment and a self-expansion rate difference due to heat treatment at 130 ° C. or higher after boiling water treatment. (D) A polyester multifilament yarn having a thermal stress at 100 ° C. of 0.15 g / de or less. Here, it is preferable that the draw false twist temperature is 80 to 130 ° C. and the false twist draw ratio (D) is 1 <D <(1 + 0.003L). In addition, L represents the maximum elongation of the natural drawing area | region in the load drawing curve of the polyester multifilament yarn with large elongation.

In the polyester multi-layered structure yarn of the present invention, a variation in fineness is formed in a part of the constituent single fiber of the yarn arranged in the sheath portion (sheath yarn) of the two-layer structure yarn by the high elongation difference false twist. ,
At the same time, this causes a difference in shrinkage and a difference in self-expansion to form a random difference in yarn length, and a highly shrinkable polyester yarn in which an isophthalic acid component is copolymerized with the yarn arranged in the core portion (core yarn). Since a larger thread difference is formed between the core and the sheath by using it, a large amount of voids between fibers which has never been obtained can be provided, and a lightweight and warm feeling can be provided. In addition, even though the difference in expansion and contraction of the core-sheath is large, the difference in dyeing and dyeing is small, and it is possible to obtain a soft touch, excellent rebound, and an excellent appearance and feel.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an example of a manufacturing process of a polyester multilayer structure yarn according to the present invention. As shown in FIG. 1, a polyester multifilament yarn 1 having a small elongation and a polyester multifilament yarn 2 having a large elongation which is three times or more the elongation of the yarn 1 are provided on the first roller 3 and the second roller 3. Entangling is performed by the entanglement nozzle 6 provided between the rollers 4. The compressed air pressure at this time is 1 to 6 kg / cm ² ,
The appropriate overfeed rate is 0.5 to 4%.

Here, the polyester multifilament yarn 1 having a low elongation refers to a polyester multifilament yarn having an elongation of 50 to 130% and copolymerized with an isophthalic acid component, and a polyester multifilament having a high elongation. The yarn 2 refers to a normal polyester multifilament yarn having an elongation of more than 130% and 450% or less. In addition, the multifilament yarn 2 needs to have an elongation of 3 times or more that of the multifilament yarn 1. When the elongation of the multifilament yarn 2 is less than 3 times the elongation of the multifilament yarn 1, the winding tension of the multifilament yarn 2 becomes too strong, and there is a large difference between the legs, and A loose two-layer structure cannot be formed. However, if the elongation of the multifilament yarn 2 is too large, the physical properties of the yarn will be deteriorated, so it is preferable to stop the elongation within 5 times.

Next, the entangled yarn is simultaneously drawn and false twisted by using a heating plate 7 provided between the second roller 4 and the drawing roller 5 and a false twisting disk 8. At this time, the false twist temperature is 8
The temperature is preferably 0 to 130 ° C. False twist temperature is 80 ° C
In the case of less than 2, the winding tension of the yarn 2 having a high elongation to the yarn 1 having a low elongation becomes high during false twisting, and there is a large difference in yarn length and a loose two-layer structure. Cannot be formed, and a durable crimp cannot be obtained and large bulkiness cannot be obtained. On the other hand, when the false twist temperature exceeds 130 ° C., fusion of the yarn 2 is likely to occur, and the cross section of the single fiber is deformed, so that sufficient bulkiness and soft touch cannot be exhibited.

Further, the draw ratio should be more than 1 and not more than (1 + 0.003L) times when the maximum elongation in the natural drawing region of the load drawing curve of the yarn 2 having a high elongation is L (%). Is preferred. If the draw ratio exceeds (1 + 0.003L) times, not only cannot the variation in fineness be formed in a part of the constituent monofilaments of the yarn arranged in the sheath, but also the false twisting firing tension Is high, there is a large difference in thread length, and a loose two-layer structure cannot be formed.

On the other hand, the peripheral speed of the false twist disk 8 is preferably about twice the yarn speed. Next, the heat-set and untwisted entangled yarn is wound by the winder 9 to obtain the multilayer structured yarn 10.

In the present invention, the highly shrinkable polyester used in the yarn 1 is an isophthalic acid component containing a sulfonic acid metal base, such as 5-sodium sulfoisophthalic acid or 5-tetrabutylphosphonium sulfoisophthalic acid. It means a yarn copolymerized by a known method. on the other hand,
The polyester multifilament yarn used for the yarn 2 has terephthalic acid as a main acid component, and at least 1
A thread obtained by melt-spinning a polyester having at least one alkylene glycol selected from ethylene glycol, trimethylene glycol, and tetramethylene glycol as a main glycol component, by a conventional method. Further, these polyesters may be added with a stabilizer, an antioxidant, a flame retardant, an antistatic agent, a fluorescent color enhancer, a catalyst, a colorant, inorganic fine particles and the like within a range that does not impair the object of the present invention. However, the cross section may be modified.

Further, in the present invention, the yarn (1) constituting the core portion is the following (a), and the yarn (2) constituting the sheath portion is the following (b), (c), ( It is important to satisfy d) at the same time. (A) Shrinkage rate of boiling water is 10% or more, and after boiling water treatment 1
Polyester multifilament yarn obtained by copolymerizing an isophthalic acid component that further shrinks when heat-treated at 30 ° C or higher. (B) A polyester multifilament yarn that self-expands in the longitudinal direction of the fiber by a heat treatment at 130 ° C. or higher after boiling water treatment. (C) A polyester multifilament yarn having a difference in fineness in the length direction of the fiber, and a shrinkage difference due to boiling water treatment and a self-expansion rate difference due to heat treatment at 130 ° C. or higher after boiling water treatment. (D) A polyester multifilament yarn having a thermal stress at 100 ° C. of 0.15 g / de or less.

That is, the polyester multifilament yarn 1 having a low elongation, which is the core yarn of the two-layer structure yarn, is obtained by copolymerizing an isophthalic acid component, and it is sufficient that the so-called dyeing process does not cause heat shrinkage even in the relaxation process and the subsequent processes. Bulkiness cannot be imparted. In addition, since the difference in elongation between the yarn 2 having a high elongation and the yarn 1 having a low elongation is large, it is easy to cause a difference in dyeing. However, by using a copolymer of an isophthalic acid component, It also has the effect of reducing the difference in dyeing. As a method for producing the multifilament yarn 1 having a low elongation having the above characteristics, a polyester obtained by copolymerizing an isophthalic acid component is spun at a high speed of about 3,000 m / min or more, among which 5, A method of spinning at an ultra high speed of 000 m / min or more can be mentioned.

On the other hand, the polyester multifilament yarn 2 having a high degree of elongation, which is a sheath yarn of a two-layer structure yarn, cannot be provided with sufficient bulkiness in the so-called dyeing step unless it is self-expanded in the steps after the relaxation step. In addition, there is fineness unevenness in the length direction of the fiber, shrinkage unevenness in the relaxation process or dry heat treatment after relaxation, or self-expansion unevenness occurs in dyeing, and if random yarn leg differences do not occur between sheath yarns, Sufficient bulkiness cannot be imparted. Furthermore, the thermal stress at the time of relaxation is as low as 0.15 g / de or less, and when relaxed, it is more susceptible to the restraining force of the woven fabric and the like, and heat setting without much shrinkage provides higher bulkiness.

As a method for producing the multifilament yarn 2 having the above-mentioned characteristics and having a high elongation, polyester is approximately 2,500 m / min or less, and particularly 2,000.
A method of spinning at a low spinning speed of m / min or less can be mentioned. The false twist temperature is 80 to 130 ° C., and the false twist draw ratio is 1 to
The above-mentioned characteristics can be obtained by stretching (1 + 0.003 L) times the false-twist. Here, regarding the relationship between the yarn 1 having a small elongation and the yarn 2 having a large yarn, other than “elongation of the yarn 2 having a large yarn ≧ elongation of the yarn 1 having a small elongation × 3” In addition, "a false twist draw ratio 1 to 1 selected by a yarn 2 having a high elongation
(1 + 0.003L) "and a stretch ratio of 1 to 1 + 0.
There is a range shared with the range of "007B", and it is necessary to use the false twist draw ratio of this shared range. That is, outside of this shared range, it is difficult to obtain both the yarn characteristics and stable processability that are the objects of the present invention at the same time.

After the drawn false twist, the monofilament denier of the yarn 1 having a small elongation is preferably 3 to 7 de, and the monofilament denier of the yarn 2 having a large elongation is preferably 2 to 4 de. The ratio of the small yarn 1 to the whole yarn is 30 to 50% by weight.
Is preferred. As a result, in addition to a lightweight warm feeling, it is possible to give a soft touch and a repulsive texture. The thus-obtained two-layer structured yarn is a multi-layer structured yarn having a difference in the thread between the core and the sheath as well as within the sheath thread, and thus when used as a fabric, exhibits a lightness and a warm feeling that have not been obtained in the past.

[0018]

EXAMPLES The present invention will be described in more detail below with reference to examples. In addition, each physical property in an Example was measured by the following method. Thermal stress Kanebo Engineering Co., Ltd., thermal stress measuring instrument (type KE-II) was used, and 1/30 g /
After the initial load of de was applied, the temperature was raised at a rate of 2.3 ° C./min, and the generated stress was recorded on the chart. The value of thermal stress is g /
Expressed in de.

Example 1 Polyester multifilaments (75 denier / 12 filaments) obtained by copolymerizing an isophthalic acid component having an elongation of 80%, spun at a spinning speed of 4,500 m / min, according to a conventional method, and a spinning speed of 1,200 m. Polyester multifilament (180 denier / 48 filament) having a triangular cross section with an elongation of 270% and a maximum elongation of 120% in the natural stretching region spun at an interlace nozzle using the device of FIG. 1 and then stretched. A false twist process was performed.

At this time, the overfeed rate of confounding is 2
%, Compressed air pressure 3 kg / cm ² , false twist temperature 105
℃, draw ratio 1.25, disk surface speed 800
m / min, the stretching roller speed was 400 m / min. Further, the multi-layer structure yarn obtained by this is 20
With 9 denier / 60 filaments (core yarn single yarn denier 5.1 de, sheath yarn single yarn denier 2.3 de), the boiling water shrinkage rate was 14% and the core-sheath difference was 34%.

Further, the boiling water shrinkage ratio of the core yarn in the obtained multi-layered yarn is 12%, and in the dyeing after weaving described later,
It was possible to contract further. Further, the sheath yarn has a fineness difference in the length direction of the fiber, and in the boiling water treatment (relaxation etc.) after weaving described later, the shrinkage difference is
It was possible to develop a difference in self-elongation rate by heat treatment (dyeing, etc.) at 130 ° C. or higher.

Also, this yarn was dyed with Eastman Kodak Eastman Polyester Blue GLF Dye 9
As a result of observing with a microscope after dyeing at 7 ° C., a difference in fineness was recognized in the length direction of the single fiber of the sheath yarn, and when the length was measured from the difference in dyeing density, it was found to be approximately 5 to 30 mm. The pitch was mixed. The sheath yarn was separated and the thermal stress was measured. As a result, it was 0.09 g / de at 100 ° C.

Then, the multi-layered structure yarn is twisted at 300 T / m, woven into a 2/2 twill structure, relaxed (100 ° C., 25 minutes) and dry-heat free set (180 ° C., 45 seconds) according to a conventional method. ), Preset (180 ° C, 45
Second), alkali weight loss (97 ° C, 15% by weight), dyeing (130 ° C, 45 minutes), final set (160
(° C, 45 seconds) to perform dyeing and finishing. The obtained fiber has a basis weight of 170 g / m ² and a bulk of 3.3 g / m ² .
cm ³ , repulsion is BR 89%, very lightweight, and
A warm, soft-touch, high-resilience feeling was obtained, and a slight difference in dyeing between the core and the sheath and the difference in dyeing between the core yarns gave a natural appearance, and the overall bathochromic property. A high appearance woven fabric was obtained. In addition, when the yarn is unraveled from this woven fabric and further the core yarn and the sheath yarn are separated,
Even with the sheath yarn alone, the bulkiness was observed due to the random difference in foot length.

Example 2 Using the multilayer structured yarn obtained in Example 1, 30
A twisting yarn of 0 T / m was applied, and a steam set was further added at 65 ° C. for 30 minutes, and then a weaving / dying finishing process was performed so that the finishing density was the same as that of Example 1, and a basis weight of 165 g / m ² and a bulk were obtained. Sex 3.6g / cm ² , Repulsion BR91
% Of the woven fabric was obtained, which was even lighter than the woven fabric obtained in Example 1 and was excellent in bulkiness and soft touch.

[0025]

As described above, according to the present invention, it is possible to obtain a multi-layered yarn which is lightweight, has an excellent warm feeling, is natural and has a soft touch, and is also excellent in resilience.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a manufacturing process of a polyester multilayer structure yarn according to the present invention.

[Explanation of symbols]

1 Polyester multifilament yarn with reduced elongation 2 Polyester multifilament yarn with high elongation 10 Multi-layer structure yarn

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-118976 (JP, A) JP-A-7-118973 (JP, A) JP-A-6-57564 (JP, A) JP-A-2- 293426 (JP, A) JP-A-2-160940 (JP, A) JP-A-4-41729 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) D02G 1/00-3 / 48 D02J 1/00-13/00

Claims (2)

(57) [Claims] 1. A polyester multifilament yarn (1) having a low elongation and a polyester multifilament yarn (2) having a high elongation which is 3 times or more the elongation of the yarn (1) are entangled with each other. In a multi-layer structure yarn in which a part of the constituent monofilament of the yarn arranged in the sheath portion by simultaneous drawing and false twisting has a fineness variation, the yarn (1) constituting the core part has the following (a) In addition, the yarn (2) constituting the sheath portion simultaneously satisfies the following (b), (c), and (d) at the same time, a polyester multi-layer structure yarn excellent in lightweight warm feeling. (A) Shrinkage rate of boiling water is 10% or more, and after boiling water treatment 1
Polyester multifilament yarn obtained by copolymerizing an isophthalic acid component that further shrinks when heat-treated at 30 ° C or higher. (B) A polyester multifilament yarn that self-expands in the longitudinal direction of the fiber by a heat treatment at 130 ° C. or higher after boiling water treatment. (C) A polyester multifilament yarn having a difference in fineness in the length direction of the fiber, and a shrinkage difference due to boiling water treatment and a self-expansion rate difference due to heat treatment at 130 ° C. or higher after boiling water treatment. (D) A polyester multifilament yarn having a thermal stress at 100 ° C. of 0.15 g / de or less. 2. The drawing false twist temperature is 80 to 130 ° C., and
The polyester multilayer structure yarn excellent in a lightweight warm feeling according to claim 1, wherein a false twist draw ratio (D) is 1 <D <(1 + 0.003L). Here, L represents the maximum elongation of the natural drawing region in the load drawing curve of the polyester multifilament yarn having a large elongation.