JPH0617332A - Different shrinkage mixed yarn and method for producing the same - Google Patents

Abstract

(57) [Summary] [Object] To provide a method capable of easily and inexpensively producing a heterogeneous shrinkage mixed fiber yarn having an excellent slimy feel and a soft texture. [Structure] After a plurality of melted and discharged polyester filament groups are once cooled, one filament group is reheated through a heating cylinder whose outlet side is open, and the other filament group is reheated through a heating tube having a shutter on the outlet side, and then After being collected at a speed of 3500 to 5500 m / min, the mixed yarn is mixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester different shrinkage mixed yarn and a method for producing the same. More specifically, a method for producing a different shrinkage mixed fiber using a heating cylinder having a shutter on the exit side of the traveling filament group and a heating cylinder not having the shutter, and a bulky texture different from the conventional one obtained by the method. The present invention relates to a heterogeneous shrinkage mixed yarn that is excellent in quality and has no defects such as sheep and fluff.

[0002]

2. Description of the Related Art It is well known that a polyester blended yarn exhibiting bulkiness by heat treatment can be obtained by blending polyester fibers having different thermal shrinkage. In such a mixed fiber, a polyester fiber having a high shrinkage ratio shrinks during heat treatment, whereby a polyester fiber having a low shrinkage ratio overhangs, thereby imparting bulkiness. At this time, by making the fineness of the high-shrinkage fiber monofilament thick and making the fineness of the low-shrinkage fiber monofilament fine, the texture of the bulky yarn after the heat treatment has a soft surface touch and is elastic. Become.

In order to obtain a polyester mixed fiber having a difference in heat shrinkage, a method of mixing a plurality of filaments having a difference in heat shrinkage in advance is often adopted. For example, in Japanese Unexamined Patent Publication No. 54-82423, a spun filament obtained by melt-discharging polyester from the same spinneret and quenching is divided into two, and one yarn bundle is mainly composed of water. A method has been proposed in which an oil agent is applied, and an agent having a boiling point higher than that of water is applied to the other one yarn bundle, and then the two are separately heat-treated under the same conditions while being stretched and then mixed. There is. However, since the difference in shrinkage (boiled water shrinkage) is given between the yarn bundles by utilizing the boiling point difference of the spinning oil agent, the difference in the boiling water shrinkage between the yarn bundles cannot be sufficiently increased, and the resulting mixture The yarn has a small difference in shrinkage between fibers. Therefore, the bulky yarn finally obtained has poor bulkiness, and a satisfactory feel cannot be obtained.

By the way, partially oriented yarn (hereinafter referred to as POY) obtained by melt spinning at a spinning take-up speed of about 3000 m / min has a large boiling water shrinkage ratio, and is considered to be used as a highly shrinkable fiber of the mixed fiber. However, although POY has a large difference in shrinkage by boiling water, its crystal structure is not perfect as compared with a filament that has been subjected to sufficient heat-setting treatment after drawing (hereinafter referred to as drawn heat-set yarn). It has various drawbacks such as structural changes and poor heat resistance and dimensional stability.

In recent years, the textile market environment has changed from the demand for uniform and homogeneous products to the demand for various and diverse products in line with the trend toward higher quality of consumers, and small-value / mass production to small-lot / multi-value added products. It is changing to production. On the other hand, speeding up is urgently required to improve productivity. Under these circumstances, for example, in Japanese Patent Laid-Open No. 62-191511, the spun yarn is discharged, cooled, and then reheated to 4000 m /
Min-6000m / min, and after fully orienting,
A method has been proposed in which two or more kinds of filaments having different boiling water shrinkages are combined. That is, when the melt-discharged polyester fiber is once cooled and then reheated, the single fiber fineness ratio of the high shrinkage yarn and the low shrinkage yarn is preferably 1.5 or more, and the ambient temperature of the reheating device is changed. As a result, the difference in shrinkage of boiling water is developed. However, according to this method, although a mixed yarn having high productivity and high bulkiness can be obtained, a different-shrinkage mixed yarn having a new texture with improved sliminess and a soft surface touch is desired. Moreover, there are individual reheating devices along the filament group,
Moreover, since the temperature setting must be changed, it was not a preferable direction in terms of capital investment.

[0006]

The present invention has been made against the background of the above-mentioned prior art, and an object thereof is to provide a different shrinkage having a difference in heat shrinkage even if heat treatment is performed using the same heating device at the same temperature setting. It is an object of the present invention to provide a new method by which a mixed fiber can be manufactured at a low cost under high-speed yarn production.

Another object of the present invention is to provide a heterogeneous shrinkage mixed yarn which is excellent in sliminess and has a soft texture.

[0008]

As a result of intensive studies to achieve the above object, the inventors of the present invention have controlled the shape of the filament group outlet side of the heating device to control the traveling filament wake. The present inventors have found that a mixed yarn having a physical property difference different from that can be stably and easily obtained and reached the present invention.

That is, according to the present invention: After the polyester is melted and a plurality of filament groups discharged from the spinneret are once cooled, different heat treatments are applied through respective heating cylinders, and then 3500 m / min or more 5
When producing a heterogeneous shrinkage mixed yarn by blending the mixed yarn after being taken up at a speed of 500 m / min or less, one filament group is passed through a heating cylinder whose filament group outlet side is open, and the other filament group is a filament. 1. A method for producing a different shrinkage mixed fiber, wherein a heating cylinder whose outlet side is narrowed by a shutter is passed through; Provided is a heterogeneous-shrink mixed yarn, which comprises a low shrinkage yarn group A and a high shrinkage yarn group B that simultaneously satisfy the following characteristics.

Low shrinkage yarn group A (a) Elongation (ELa); 100 ≧ ELa ≧ 50 (%) (b) Orientation (ΔNa); 0.15 ≧ ΔNa ≧ 0.06 (c) Specific gravity (ρa) 1.390 ≧ ρa ≧ 1.355 (d) Boiling water shrinkage (BWSa); 35 ≧ BWSa ≧ 3 (%) (e) Melting point (Tma); Tma ≧ 260 (° C.) High shrinkage yarn group B (a ′) ) Elongation (ELb); 80 ≧ ELb ≧ 40 (%) | ELa-ELb | ≧ 10 (b ′) Degree of orientation (ΔNb); 0.16 ≧ ΔNb ≧ 0.10 | ΔNa−ΔNb | ≧ 0.01 (C ′) Specific gravity (ρb); 1.370 ≧ ρb ≧ 1.345 ρa−ρb ≧ 0.01 (d ′) Shrinkage rate of boiling water (BWSb); 70 ≧ BWSb ≧ 35 (%) BWSb−BWSa ≧ 20 ( %) (E ′) melting point (Tmb); Tmb ≧ 260 (° C.) Tma-Tmb> 0

The polyester used in the present invention is mainly a polyester whose main repeating unit is ethylene terephthalate. However, a small amount (usually 20 mol% or less based on the terephthalic acid component) of a third component other than the terephthalic acid component and / or the ethylene glycol component may be copolymerized, and a small amount of another type polymer (usually It may be a mixture of 10% by weight or less with respect to polyester.

In the present invention, a plurality of filament groups obtained by melting and discharging the polyester are once cooled,
Each is heat-treated using a heating cylinder, then 3500-55
The yarn is collected at a speed of 00 m / min and then combined. Here, the melting temperature and cooling conditions of the polyester may be the conditions usually adopted for melt spinning of polyester, for example, 285.
Melts in the temperature range of ~ 300 ° C, temperature 25 ° C, temperature 65%
It may be cooled with the cooling air. Also, each heating cylinder is preferably attached 0.6 to 1.2 m below the spinneret,
For example, 2 to 8 stainless steel heating cylinders with an effective length of 1 to 1.5 m and an inner diameter of 30 to 60 mmφ surrounded by a box-shaped heat medium tank with a length of 1.5 m and a width of 1 m are stored at equal intervals. Install the heating device. Since the heating device is heated by the heating medium set to the same temperature, the heating cylinder itself is set to substantially the same temperature. The take-up speed is in the above range,
In particular, it is necessary to set 4000 to 5000 m / min, and
If it is less than 00 m / min, the elongation and the boiling water shrinkage ratio become large, and the difference in physical properties between filament groups does not appear, and a heterogeneous shrinkage mixed yarn exhibiting a sufficient feeling cannot be obtained, and a sufficient fiber structure is obtained. Since it is not formed, there is a problem that the boiling water shrinkage rate is too high or fibrillation is likely to occur during alkali reduction processing. On the other hand, if it exceeds 5500 m / min,
Any filament group has low elongation and boiling water shrinkage, so that sufficient bulkiness cannot be obtained.

According to the manufacturing method of the present invention, in the above-mentioned yarn making method, one filament group is passed through a heating cylinder whose outlet side is open, and the other filament group is provided with a hole through which the filament group can run on the filament group outlet side. It has the greatest feature in passing the heating cylinder that is narrowed down by the shutter that it has. The shape of the hole provided on the outlet side is circular,
The shape is arbitrary, such as a quadrangle, but the diameter or width is preferably 3 to 10 mm, particularly 5 to 10 mm, and by doing so, the wake flow brought in by the filament group traveling at high speed can be reduced, and the ambient temperature in the heating cylinder can be reduced. Can be prevented. On the other hand, in the opened heating cylinder, the ambient temperature in the heating cylinder lowers because there are many accompanying flows. Therefore, even if the same heating cylinder is used, different heat treatments can be performed only with and without the shutter.

Further, in the case where the shutter is provided, when the hole diameter becomes smaller, the accompanying flow carried in by the yarn becomes difficult to be discharged from the hole portion, which causes air resistance and applies a high tension to the running filament. Combined with this, it becomes possible to obtain a low-shrinkage yarn of higher orientation and higher crystallinity. On the other hand, when there is no shutter, the tension applied to the running filament decreases and the temperature in the heating cylinder also decreases as described above, so only molecular orientation advances and oriented crystallization does not proceed, and high shrinkage yarn Can be obtained.

The opening of the lower part of the heating cylinder as referred to in the present invention means that when the opening hole diameter exceeds 30 mm, the temperature in the heating cylinder does not rise to the glass transition temperature of polyester and molecular orientation does not proceed. , Diameter or width is 30mm
In the following, a shutter having an aperture of 10 to 25 mm may be provided. In this case, it is desirable from the characteristics of the mixed fiber that the difference between the runnable hole diameter and the diameter is 5 mm or more, especially 5 to 10 mm.

The shutter is preferably an open / close type shutter from the standpoint of workability at the start of yarn production, and the heating cylinder is preferably a heating medium heating from the viewpoint of uniform heating and energy consumption.

The setting temperature of the heating cylinder is arbitrary as long as it is about 300 ° C. or lower, and it is also possible to obtain an effect opposite to the above by setting it to 70 to 100 ° C. That is, at such a temperature, the shutter allows the temperature of the running filaments to be higher than the glass transition temperature, and the tension based on the air resistance can be applied. A crystalline highly shrinkable yarn can be obtained.

Next, further description will be given with reference to the drawings. Figure 1
It is a schematic diagram showing an example of spinning equipment used by the present invention. In FIG. 1, a polyester fiber yarn 2 (2A: low shrinkage yarn group, 2B: high shrinkage yarn group) discharged from a spinneret 1 is once cooled through a spinning cooling barrel 3, and a heating medium including a heating barrel 4 is provided. After being subjected to running heating and drawing by the reheating device 5 by heating, the physical properties of the yarn are determined by the diameter of the yarn outlet 6 (6A: diameter / width is narrow, 6B: diameter / width is wider than 6A). , The yarn is applied with an appropriate amount of oil in the weaving process by the oil application device 7, pre-entangled by the interlace nozzle 8, the yarn is taken up by the take-up rollers 9 and 10, and again between the take-up roller 10 and the wonder 12. An interlace nozzle 11 is provided and the low shrinkage yarn group and the high shrinkage yarn group are post-entangled together and wound by a wonder 12. At this time, in the pre-entanglement, the yarns 2A and 2B may be entangled together and post-entangled again like 7 '.

FIG. 2 shows an enlarged schematic view of the above reheating device. In the drawing, the yarn outlet 6A narrows the diameter of the yarn outlet in order to prevent the discharge of the accompanying flow brought in by the yarn to obtain the low shrinkage yarn group and to suppress the decrease of the ambient temperature in the cylinder. On the other hand, at the yarn outlet 6B, the diameter of the yarn outlet is made narrower than that of 6A by lowering the atmosphere temperature in the cylinder to near the glass transition temperature region in order to obtain a high shrinkage yarn group.

The different shrinkage mixed yarn obtained by the production method of the present invention described above preferably satisfies the following characteristics at the same time by appropriately setting the spinning speed, heating cylinder temperature, shutter diameter and the like.

Elongation E of low shrinkage yarn group (hereinafter referred to as A group)
La is preferably in the range of 50 to 100%, particularly 50 to 80%, and when it is less than 50%, the texture becomes hard and the slimy feeling disappears and fluff is likely to occur during further stretching or false twisting. If it exceeds 100%, changes in shrinkage and dyeing with time increase, which is not desirable.
The elongation ELb of the high shrinkage yarn group (hereinafter referred to as B group) is 4
0 to 80%, especially 40 to 70%, with ELa
It is desirable that the difference in elongation between and is 10% or more. If it is less than 40%, the texture becomes hard, and if it exceeds 80%, the bulkiness is not exhibited. Elongation difference | ELa-ELb
Even if | is less than 10%, the bulkiness is not exhibited and the texture and texture are deteriorated.

Next, the degree of orientation ΔNa of the group A is 0.06 to 0.
15, preferably in the range of 0.08 to 0.15, and 0.
When it is less than 06, the molecular orientation is too low, and the strength and elongation are largely decreased with the passage of time, and when it is subjected to processing such as stretching and false twist, it becomes unbalanced with the group B and fluffing is likely to occur. On the other hand, when it exceeds 0.15, there is no difference in orientation from the group B, and it becomes difficult to develop bulkiness. The orientation degree ΔNb of the group B is in the range of 0.10 to 0.16, and the orientation degree difference is 0.0.
It is desirable that the number is 1 or more. If this is not satisfied, sufficient bulkiness cannot be exhibited, and the yarns of group A will not overhang on the yarn surface.

The specific gravity ρa of the group A is 1.355-1.
390, especially in the range 1.360 to 1.385, B
The specific gravity ρb of the group is 1.345 to 1.370, especially 1.35.
Is in the range of 0 to 1.370, and ρa−ρb is 0.0.
It is preferably 1 or more. When ρa is less than 1.355, the difference in specific gravities becomes small and sufficient bulkiness is difficult to be exhibited, and when ρa exceeds 1.390, fluff is likely to occur during the further drawing false twisting process. . However, it is preferable that ρa is large in order to obtain a difference in feeling from the group B, and therefore, as described above, 1.360 to 1.385 is particularly preferable. On the other hand, when ρb is less than 1.345, the crystallization is too low and the physical properties change with time, and when it exceeds 1.370, the difference from ρa becomes small and the texture deteriorates. However, since the specific gravity of group B also plays a large proportion in determining the feeling, it is desirable that ρb is large in the range where ρa−ρb is 0.01 or more, and if ρa−ρb is less than 0.01, the wind will be adversely affected. It is not desirable because it reduces the

The boiling water shrinkage rate BWSa of the group A is 3 to.
A range of 35%, particularly 3 to 25% is desirable. When it exceeds 35%, the difference from the boiling water shrinkage rate BWSb of the group B becomes small, so that not only the feeling becomes hard as a whole but the thread of the group A does not project. On the other hand, BWSb is 35 to 70%
The range is preferable, and the higher the range is, the more the protrusion of the group A on the yarn surface increases, which is preferable. However, when weaving as it is, the texture tends to be hard as a whole. Further, the difference between BWSa and BWSb is preferably 20% or more in order to exhibit sufficient bulkiness.

Furthermore, the melting points of the groups A and B (Tma, Tm
It is desirable that both b) are 260 ° C. or higher in terms of the texture of the finally obtained product, but especially when Tma is higher than Tmb, the difference in shrinkage rate is more likely to occur and the texture becomes good. preferable.

The different shrinkage mixed filament yarn of the present invention described above is
The fineness of the groups A and B may be the same or different, and the cross-sectional shapes may be different from each other, and are arbitrary. Further, if the total fineness is too large, the bulge becomes too large and the texture is likely to decrease. Therefore, it is preferably 200 denier or less, particularly 150 denier or less, and the finer the single fiber fineness, the better the texture.

The heterogeneous shrinkage mixed yarn of the present invention may be woven as it is, but may be drawn or false twisted in a separate step. The draw ratio at this time is unique to the spinning take-up speed.
It is about 05 to 1.50 times.

[0028]

According to the manufacturing method of the present invention described above, even if the same heating cylinder is used and the same set temperature is used,
Since the accompanying flow can be controlled by the shutter, the ambient temperature in the heating cylinder of the traveling filament group can be easily controlled, and the tension applied to the filament group can also be controlled, making it easy to change the single yarn fineness between filament groups. A different shrinkage mixed yarn can be obtained. That is, since only the molecular orientation is promoted by opening the lower part of the heating cylinder, the same fineness traveling in the heating cylinder set at the same temperature by the heating medium in the same reheating device. Even if it is a polyester fiber, the elongation, orientation degree, specific gravity, and boiling water shrinkage ratio differ depending on the presence or absence of a shutter, and by converging polyester filaments with different physical properties together, excellent bulkiness and texture are exhibited. Becomes

The mixed yarn obtained by such a method is
Compared with the conventional mixed yarn, the yarn on the low elongation side has a high elongation and is excellent in sliminess.

[0030]

The present invention will be described in more detail with reference to the following examples.
The elongation, orientation, specific gravity, boiling water shrinkage, and melting point were measured by the following methods. (A) Elongation (ELa, ELb): Measured at a sample length of 20 cm and a pulling speed of 100% / min using an autograph manufactured by Shimadzu Corporation. (B) Orientation degree (ΔNa, ΔNb): The orientation degree was determined by a polarization microscope under a monochromatic (sodium) lamp, based on the retardation determined from the compensation angle of the compensator, the number of interference fringes, and the diameter of the sample. (D) Shrinkage rate of boiling water (BWSa, BWSb); 10 samples
The shrinkage amount when heat-treated in a restrained state for 30 minutes in boiling water at 0 ° C. is expressed as a percentage of the sample length. (E) Melting point (Tma, Tmb): Using a DSC manufactured by DU-PONT, the melting point was measured by raising the temperature at a temperature rising rate of 20 ° C./min. (F) Feeling; ◎ ○ × according to the softness of the fabric by touching it, and the standard is strength 4.7 g / d, elongation 30-40.
% Woven fabrics woven with 10% yarns, soft and slimy and elastic, ◯, slightly softer than the standard product, and ◯, which gives the same or very hard feeling.

[0031]

[Examples 1 to 3] Melting temperature of polyester chips 290
After melting at ℃, using a spinneret with a hole diameter of 0.2 mmφ, a land length of 0.8 mm, and a hole number of 36 holes, and melting and discharging, each fineness, spinning take-up speed, and set temperature of the reheating device are shown in Table 1. It was wound under the conditions described. At that time, the shutter of the lower part of the heating cylinder of the group A was closed, and the shutter of the lower part of the heating cylinder of the group B was opened. The results are shown in Table 1.
In each of Examples 1 to 3, there was no particular problem in terms of feeling and, in addition, sufficient bulkiness was obtained, and as the fineness became finer, a softer and drapable product was obtained.

[0032]

[Comparative Examples 1 to 3] Using the same melting temperature and spinneret as in Examples 1 to 3, the fineness, spinning take-up speed, and set temperature of the reheating device were set to the conditions shown in Table 1, and the results were taken up. Table 1
Shown in. In Comparative Example 1, the elongation, orientation and specific gravity of the low-shrinkage yarn group are out of the ranges of the present invention, so the bulkiness is high, but the feel becomes stiff. In Comparative Example 2,
Since the temperature of the reheating device was turned off (room temperature), the physical properties of the group A and the group B were the same, and thus the bulkiness was not exhibited. Further, in Comparative Example 3, the spinning take-up speed was 350.
Since it was less than 0 m / min, the elongation and shrinkage ratio of the group A became too high, and the function as a different shrinkage mixed yarn was not exerted, and only a hard texture was obtained.

[0033]

[Embodiment 4] As a group B, a slit width of a discharge hole having a Y-shaped discharge hole is 0.10 mm, a land length is 0.10 mm,
A spinneret with 36 holes was used, while the same spinneret as in Example 1 was used as the group A, and wound under the conditions shown in Table 1. The results are shown in Table 1. Group B has a triangular cross-section, so a more silky, crisp texture is developed.
A product that was bulky and was softer than that of Example 3 and excellent in drape was obtained.

[0034]

[Embodiment 5] The same operation as in Embodiment 1 is carried out except that the set temperature of the heating cylinder is 100 ° C. The results are shown in Table 1. Although it is possible to obtain the one having the elongation and the orientation degree opposite to those of Example 1, the orientation of the other side is sufficiently high and the boiling water shrinkage rate is very high when the shutter is provided, so that the other filament is bulged to the fiber surface. And exhibits excellent bulkiness.

[0035]

[Table 1]

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of spinning equipment used in the present invention.

FIG. 2 is an enlarged schematic view showing an example of a heating cylinder used in the present invention.

[Explanation of symbols] 1. Melt spinneret 2. Thread 2A. Low shrinkage yarn group 2B. High shrinkage yarn group 3. Spinning cooling tube 4. Heating cylinder of reheating device 5. Reheating device (heat medium heating) 6. Thread exit 6A. Low shrinkage yarn outlet 6B. High shrink yarn outlet 7. Oil agent applying device 8. Interlace nozzle (pre-entanglement) 9. Take-up roller 10. Take-up roller 11. Interlace nozzle (post-entanglement) 12. Winder

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Claims (2)

[Claims] 1. A method in which a plurality of filament groups melted with polyester and discharged from a spinneret are once cooled, and then subjected to different heat treatments through heating cylinders, respectively, and then 3500 m / m.
When producing a heterogeneous shrinkage mixed yarn by blending the mixed yarns after taking it off at a speed of not less than 5 minutes and not more than 5500 m / minute, one filament group is passed through a heating cylinder whose filament group outlet side is open, and the other filament group is Is a method for manufacturing a different shrinkage mixed fiber, wherein the outlet side of the filament group is passed through a heating cylinder squeezed by a shutter. 2. A different-shrinkage mixed filament yarn comprising a low shrinkage yarn group A and a high shrinkage yarn group B which simultaneously satisfy the following characteristics. Low shrinkage yarn group A (a) Elongation (ELa); 100 ≧ ELa ≧ 50 (%) (b) Orientation (ΔNa); 0.15 ≧ ΔNa ≧ 0.06 (c) Specific gravity (ρa); 390 ≧ ρa ≧ 1.355 (d) Shrinkage rate of boiling water (BWSa); 35 ≧ BWSa ≧ 3 (%) (e) Melting point (Tma); Tma ≧ 260 (° C.) High shrinkage yarn group B (a ′) Elongation (ELb); 80 ≧ ELb ≧ 40 (%) | ELa−ELb | ≧ 10 (b ′) Degree of orientation (ΔNb); 0.16 ≧ ΔNb ≧ 0.10 | ΔNa−ΔNb | ≧ 0.01 (c ′ ) Specific gravity (ρb); 1.370 ≧ ρb ≧ 1.345 ρa−ρb ≧ 0.01 (d ′) Boiling water shrinkage (BWSb); 70 ≧ BWSb ≧ 35 (%) BWSb−BWSa ≧ 20 (%) ( e ′) melting point (Tmb); Tmb ≧ 260 (° C.) Tma-Tmb> 0