JPS5920775B2 - Consensusinoseizohouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for producing a polyester blend yarn, and further relates to a method for producing a new polyester blend yarn, which is a mixture of two components having different shrinkage rates, which can improve the feel of woven or knitted fabrics. This is the manufacturing method.

Silk fabrics have excellent properties such as luster, feel, and drapability that are not found in synthetic fiber woven and knitted fabrics such as polyester and polyamide.Many materials are used to give synthetic fiber woven and knitted fabrics similar properties to silk fabrics. Research is being done.

Rather than making the characteristics of synthetic fiber woven or knitted fabrics similar to those of silk fabrics, the present invention makes it possible to produce woven or knitted fabrics with novel textures that are not found in conventional natural fiber or synthetic fiber woven or knitted fabrics. The aim is to manufacture the resulting fiber by blending two component polyester multifilament yarns with different heat shrinkage rates.

Conventionally, there have been many proposals for mixed fiber yarns made by mixing two or more types of components with different heat shrinkage rates, and for manufacturing methods for mixed fiber yarns. being researched.

These proposed mixed fiber yarns and methods for producing mixed fiber yarns cause differences in shrinkage in the mixed fiber components, so the manufacturing process for each component is different, and the fiber structure also differs between the components.

Therefore, it is possible to easily change the shrinkage difference between the mixed yarn components, the combination of fiber cross-sectional shapes, etc., which are related to improving the texture, but on the other hand, the dyeing rate and dyeing speed of each component are different and are desirable for products when dyed. This causes staining spots such as moiré, which reduces the product value by half.

As a result of the inventors' earnest efforts to improve the texture of such mixed fiber yarns and solve the problem of uneven dyeing, the polyester multifilament yarn spun at a high speed of 4000 m/- or more has a normal spinning speed of about 1000 to 12 oOm/min. It was discovered that unlike yarns spun at a spinning speed of It was confirmed that by producing a blended yarn using spun yarn, a very good polyester blend yarn with improved hand feel and no dyeing difference between the blended fiber components could be produced, and the present invention was developed. It was reached.

That is, the present invention provides a polyester multifilament yarn spun at a spinning speed of 4,500 m/- or more with a single fiber denier of 3 de or less and a submerged shrinkage rate of 4% or less, and a polyester multifilament yarn spun at a spinning speed of 4500 m/- or more with a single fiber denier of 3 de or less and a submerged shrinkage rate of 6%. A method for producing a polyester blend yarn characterized by blending polyester multifilament yarns spun at a spinning speed of 4000 m/min or higher and drawn at a draw ratio of 1.1 to 1.7 times as described above. .

In the present invention, "polyester" mainly refers to polyethylene terephthalate, but it may also be a copolyester copolymerized with 5 mol% or less of a third component, and if necessary, known additives, such as additives, may be added to these polyesters. There is no problem in containing matting agents, stabilizers, flame retardants, surface modifiers, etc.

In the present invention, "submersion shrinkage rate" refers to the yarn length measured by applying a load of 0.03:l per denier to a multifilament yarn, and then processing it in boiling water for 30 minutes under a load of 0.002g per denier. , After treatment, air dry for 60 minutes and re-dry at 0.03. The value obtained by applying a load of l is the value obtained by measuring the yarn length and using the following formula from the difference in yarn length before and after the diving treatment.

Here it is.

indicates the yarn length before treatment, and LS indicates the yarn length after treatment.

Further, the single fiber denier of the polyester multifilament yarn used in the present invention is required to be 3 de or less for both components.

This is because when the single fiber denier is more than 3 de, the texture of the woven or knitted fabric becomes hard, making it impossible to provide the novel texture that is the object of the present invention.

As for the preferable single fiber denier, it is desired that the low shrinkage component appearing on the surface of the woven or knitted material has a relatively small denier, but considering the stability of the manufacturing process of polyester multifilament yarn, cost, etc., 0. 5-2
de is preferred, and it is desirable that the high shrinkage component, which is the core of the woven or knitted fabric, be within the range of 3 de or more and greater than the low shrinkage component.

However, it is not particularly limited to them.

The submerged shrinkage rate of the two-component polyester multifilament yarn used in the present invention is required to be 4% or less for the low-shrinkage component and 6% or more for the high-shrinkage component.

In other words, the feel and drape properties of mixed yarn woven and knitted materials vary greatly depending on the difference in shrinkage of the mixed fiber components, and in order to provide a fluffy, soft texture and drape properties, the submerged shrinkage rate must be 2.
On the other hand, if both of the two components have large shrinkage rates, problems will easily occur in the processing process of woven or knitted fabrics, and the density will become too large and the drapability will decrease, so the shrinkage rate should not be too large. I don't like that.

Therefore, it is preferable to keep the shrinkage rate as low as possible while increasing the difference in shrinkage between the two components, and it is preferable to use a low-shrinkage component that stretches spontaneously when heated. Since there are problems with process stability, cost, etc., polyester multifilament yarn with a submerged shrinkage rate of 4% or less is used as a low-shrinkage component.

Therefore, if the high shrinkage component has a submerged shrinkage rate of 6% or more, a sufficient difference in shrinkage from the low shrinkage component can be ensured, and a woven or knitted fabric with excellent hand and drapability can be produced.

However, if the submergence shrinkage of the high-shrinkage component is 20% or more, the shrinkage during processing of the woven or knitted material will be large and process troubles will likely occur, so the preferred range is a submergence shrinkage of 6 to 15%.

The mixing ratio of the two mixed fiber components in the present invention is not particularly limited and can be any ratio, but from the viewpoint of improving hand feel, drapability, and durability, the low shrinkage component should be 30 to 30%.
It is preferably 70% by weight.

The total denier of the mixed yarn is determined depending on the intended use of the mixed yarn and is not particularly limited, but it is preferably 30 to 200 denier from the viewpoint of the manufacturing cost of the mixed yarn and the functionality of the woven or knitted product.

The fiber cross-sectional shape of the polyester multifilament yarn used in the present invention is not particularly limited, but in order to further exhibit excellent gloss and feel, the low-shrinkage components appearing on the surface of the woven or knitted material are trilobal or cross-shaped. It is preferable to have a cross section, and it is preferable that the high shrinkage component, which is the core of the woven or knitted fabric, has the same shape as the low shrinkage component in order to prevent an apparent difference in dyeing due to a difference in light scattering between the two components.

In the production of two mixed fiber components of the polyester blend yarn of the present invention, the low shrinkage component is spun at a spinning speed of 4500 m/- or more, and the high shrinkage component is spun at a spinning speed of 400,077 L/1 or more and then 1.1 It is necessary to use one that has been stretched by ~1.7 times.

The reason for this will be explained with reference to the drawings. Figure 1 shows the submerged shrinkage rate of filament yarn when polyester multifilament yarn with a single fiber denier of 2 de is spun at high speed. In order to keep it below 4%,
It can be seen that a spinning speed of 500 mlmln or more is required.

On the other hand, Figure 2 shows the relationship between the spinning speed, break strength and elongation, and primary yield point of polyester multifilament yarns with the same single fiber denier of 2 de.As the spinning speed increases, the strength and -th yield point decrease. increases, and elongation decreases.

In addition, in order to eliminate problems such as unevenness due to straining during handling of mixed fiber yarns and fiber manufacturing, the primary yield point is 1.0. It is preferable that S'/de or more, and from this point it can be seen that a spinning speed of 4500771/111jn or more is required.

In addition, Figure 3 shows the spinning speed and shrinkage behavior of the filament yarn of a polyester multifilament yarn with a single fiber denier of 2 de. In the figure, A is 3000 ψn1B is 4000 m7", and C is 4500 m1m1n.

D was spun at a spinning speed of 5000 m/m.

In addition, as E, the fiber was spun at a spinning speed of 4000 m/- so that the single fiber denier was 2 de, and then stretched at a draw ratio of 1.35 times, and as F, the spinning speed was also 1200 m.
Also shown is one obtained by spinning at /m and then stretching at a draw ratio of 3.25 times.

Shrinkage behavior here refers to the continuous measurement of the change in yarn length when a filament yarn is placed in water at room temperature and the temperature is raised. .

0.00 per denier corrected for the buoyancy of water measured
Place it in room temperature water with a load of 2.9, and reduce the water temperature to 1℃/l.
The yarn length Lt was measured with respect to the water temperature T'C while increasing the temperature at a temperature increase rate of 11R, and is shown as the relationship between the water temperature and the shrinkage rate determined by the following formula.

As shown in Figure 3, A and B, that is, spinning speed 4000 m/
In the case of In1n or lower, the shrinkage increases up to around 70°C, and above that, the shrinkage rate decreases due to warpage and elongation. C and D, that is, those having a spinning speed of 4,500 m/m or more, are considered to be unsuitable as shrinkage components, and are preferable from the viewpoint of shrinkage behavior because they have a small shrinkage rate and little change in shrinkage rate with respect to temperature changes.

Next, regarding high-shrinkage component yarns, they are also effective in preventing yarn breakage and hanging flames when produced as mixed fiber yarns, as well as preventing sagging during fabric wear, as well as, or even better than, low-shrinkage component yarns. Because of this, a dog of primary yield point and strength is desired.

Therefore, as shown in FIG. 2, high shrinkage yarns such as those shown in FIG. 1 or 3, which are simply spun at a slow spinning speed, are unsatisfactory as high shrinkage components of the present invention.

As mentioned above, the present invention is based on the fact that the dyeability does not change much even if the multifilament yarn spun at high speed is subsequently drawn and its characteristic values such as strength and elongation, heat shrinkage, and Young's modulus change. The high shrinkage component can be obtained by stretching without lowering the spinning speed, thereby increasing the strength and primary yield point without lowering them.

Table 1 shows this in recitation.

Table 1 shows that the breaking elongation of the yarn drawn after spinning is 30%.
In addition, the discharge amount, nozzle diameter, etc. are adjusted and selected so that the single fiber denier is 2 de, and the yarn is spun at various spinning speeds. This figure shows the results of a mixed yarn beam bed with a single fiber denier 2 de spun yarn spun at a spinning speed of 4500 m/-.

Note that the stretching temperature in each stretching was kept constant at 83°C.

The spun yarn crystallinity in the table is the diffraction intensity of the (010) plane of polyethylene terephthalate that appears in the equator direction in X-ray fiber diffraction of a multifilament yarn, as shown in Figure 5, after correction for air scattering, 1c and Ia. The difference in dyeing is determined by connecting the spun yarns and the drawn yarns, knitting them in a circular manner, placing them on a tube to prevent shrinkage, fixing both ends, and dyeing them in the same bath. The difference in dyeing between yarns where no difference is observed is grade 0, and the difference in yarns with a spinning speed of 1000 m/In1n is grade 5, and the values are determined in 0.5 grade increments.

For dyeing, use Eastman Polyester as a dye.
Staining was performed using Blue GLF with 2% OWf and boiling for 40 minutes.

In addition, the mixed yarn beam bed is the result of visually determining the dyeing difference between the two components of a knitted fabric that was prepared by making mixed yarns from each drawn yarn and the above-mentioned low-shrinkage component spun yarn, circular knitted, and dyed.

Looking at Table 1, it can be seen that if the yarn is spun at a spinning speed of 4000 m/- or more, a high shrinkage component that satisfies the properties such as shrinkage rate, strength, and -order yield point can be obtained by drawing without any problems with dyeing differences. I understand.

This limit condition in which no difference in dyeing occurs clearly appears in the change in crystallinity, and Figure 4 shows the relationship between spinning speed and crystallinity of the spun yarn. % or more, preferably 40% or more, is suitable as a high shrinkage component.

In addition, as a result of examining the stretching ratio, if it is 1.1 times or more, a diving shrinkage rate of 6% or more can be obtained, and if it is more than 1.7 times, there will be a problem that the diving shrinkage rate will be too high.
．． A value of 1 to 1.7 times was considered appropriate.

For example, by making mixed fiber yarns from C, E, and F shown in Figure 3, weaving them, scouring them, dyeing them, and finishing them, products with the same excellent texture and drapability can be obtained. However, when using the C and F mixed yarn, the color was not bright and myositis was noticeable, whereas when using the C2E mixed yarn, no such problem was observed.

Next, each component yarn related to the present invention and an example of an apparatus for manufacturing the mixed fiber yarn of the present invention will be described.

FIG. 6 shows an example of a spinning device for spinning each component yarn of the present invention, in which 1 is a spinning head, 2 is a cooling tube, 3 is a spun yarn, 4 is an oil adding device, and 5 is a spinning device. Godet roller, 6
is a winder.

The high shrinkage component yarn is made by further drawing the yarn spun with the apparatus shown in FIG. 6, but it is not necessary to separate the spinning process and the drawing process, and the spinning and drawing process may be directly connected.

FIG. 7 shows an apparatus for simultaneously drawing a high-shrinkage component and blending two components at the same time, where 7 is a spun yarn for the high-shrinkage component and 8 is a spun yarn for the low-shrinkage component.

The spun yarn for the high shrinkage component is drawn out by 9 feed rollers and stretched between 10 heating rollers and 11 drawing rollers.

On the other hand, the tension of the low shrinkage component is adjusted by 12 tension adjusting devices and drawn by stretching rollers.

The two components are interlaced on a drawing roller, entangled in 13 interlace nozzles by high-speed turbulence, and then wound in 14 twist winders.

In the present invention, the method of mixing the two components is not limited to the method shown in FIG. 7, but any other method may be used.

For example, there is no problem in a method in which the fibers are electrically opened and then the two components are combined and mixed.

Furthermore, there is no need to separate the three processes of spinning, drawing, and blending, and spinning, drawing, and blending may be directly connected, and the method to be used should be determined by considering process stability, manufacturing cost, etc. Good.

The woven or knitted fabric of polyester blend yarn produced by the method of the present invention needs to be shrunk at a shrinkage rate higher than that of the low shrinkage component during scouring and presetting.

Further, after shrinkage treatment, the fiber surface is partially dissolved using an alkaline aqueous solution to enlarge the voids between the woven and knitted fabrics, which have become smaller due to shrinkage, thereby further improving the feel and drape properties.

Examples of the present invention will be shown below.

Example 1 Polyethylene terephthalate with intrinsic viscosity (@0.65)
Contains 0.07% by weight of titanium oxide as a matting agent), Y
Spinning temperature 28 using a nozzle with 24 holes in cross section
A multifilament yarn of 49.5 denier/24 filaments was obtained by extrusion at 8°C and spinning at a spinning speed of 4500 m/min.

This multifilament yarn had a crystallinity of 42% and a submerged shrinkage rate of 3.8%, and showed the shrinkage behavior of C in FIG. 3, which was considered a low shrinkage component.

Next, using the same polymer as the low shrinkage component, the spun yarn was spun and wound under the same conditions, and was stretched at a temperature of 85°C and a speed of 500 m.
/m1n1 A multifilament yarn of 39.0 denier/24 filaments was obtained by drawing at a draw ratio of 1.32 times.

The submersion shrinkage rate of the obtained multifilament yarn was 10.5.
% and the shrinkage behavior was shown as E in FIG. 3, which was taken as the high shrinkage component.

Next, the low shrinkage component and the high shrinkage component were combined on a roller rotating at a circumferential speed of 500 m/-, and then mixed using an interlace nozzle to obtain a mixed fiber yarn of 90.2 denier/48 filaments. .

After circular knitting the obtained mixed yarn using a circular knitting machine, Eastm
2%O of an polyester Blue GLF
As a result of staining using Wf, the two components could not be distinguished with the naked eye.

The two mixed fibers were circularly knitted separately without being mixed and dyed in the same bath for contrast, and the dyeing difference was 1.5.

Next, the mixed yarn was woven at a weaving density of 30 warps/cyrt and 2 wefts.
After weaving into a ponzi with 6 threads/cm without twisting, we added a scouring agent score roll of 400° to 30°C with a 2g/l 80°C aqueous solution.
1 minute scouring, 1 minute presetting with 160℃ hot air,
Alkali treatment for 60 minutes in boiling water with 20 g of caustic soda/11, dye Sumikaron Navy Blue
After staining with S2GL 2% OWf at 130°C for 60 minutes, final setting was performed at 160°C for 1 minute for finishing.

The finished mixed yarn fabric was a new non-beamed fabric that had superior texture, luster, and drapability, unlike conventional synthetic fiber woven and knitted fabrics, silk fabrics, etc.

Example 2 Polyethylene terephthalate (containing 0.07% by weight of titanium oxide as a matting agent 9) with an intrinsic viscosity of 0.65 was used at a spinning temperature of 288 mm using a spinneret with 24 holes with a Y-shaped cross section.
℃ extrusion, winding at a spinning speed of 5000 m/-, 40
．． A multifilament yarn of 6 denier/24 filaments was obtained.

The submersible shrinkage rate of the obtained multifilament yarn was 3.2.
%, and the shrinkage behavior showed the behavior shown in D in FIG. 3, making this multifilament yarn a low shrinkage component.

Note that the crystallinity of this multifilament yarn was 54%.

Next, the same polymer and the same spinning conditions as the low shrinkage component were spun, and the spun yarn was wound at a stretching temperature of 85°C and a stretching speed of 500 m/s.
The yarn was drawn at a draw ratio of 1.2 times to obtain a multifilament yarn of 33.5 denier/filament.

The submersion shrinkage rate of the obtained multifilament yarn was 9.2.
%, and the shrinkage behavior showed the behavior E in FIG. 3, which was defined as a high shrinkage component.

Next, the low shrinkage component and the high shrinkage component were combined on a roller rotating at a circumferential speed of 500 m/-, and then mixed using an interlace nozzle to obtain a mixed fiber yarn of 75.1 denier/48 filaments. .

After circularly knitting the obtained mixed yarn using a circular knitting machine, East
manPolyester Blue GLF 2%O
As a result of staining with Wf, the two components could not be distinguished with the naked eye.

The two mixed fiber components were circularly knitted separately without being mixed, and dyed in the same bath for contrast, and the dyeing difference was grade 1.

On the other hand, the results obtained by weaving and processing the above-mentioned mixed fiber yarn in the same manner as in Example 1 were excellent, with no beams as in Example 1.

Example 3 Polyethylene terephthalate (containing 0.50% by weight of titanium oxide as a matting agent) with an intrinsic viscosity [μ) Q of 65 was spun using a spinneret having 36 holes with a circular cross section at a spinning temperature of 28
The product was extruded at 8°C and wound at a spinning speed of 5000 m/min to obtain a multifilament yarn of 74.4 denier/36 filaments.

The submersion shrinkage rate of the obtained multifilament yarn was 3.5%.
The shrinkage behavior was shown as D in FIG. 3, and this multifilament yarn was used as a low shrinkage component.

Note that the crystallinity of this multifilament yarn was 49%.

On the other hand, using the same polymer as the low shrinkage component,
Extruded from a spinneret with 4 holes at a spinning temperature of 285°C and wound at a spinning speed of 4000 m/- to 103.8 denier/2.
A multifilament yarn with 4 filaments was obtained.

The obtained spun yarn was drawn at a temperature of 85° C. and a drawing speed of 750 m/min using a high shrinkage component.

Stretching and simultaneous fiber blending with a low shrinkage component were carried out by the method shown in FIG. 7 at a stretching ratio of 1.47 times to obtain a mixed fiber yarn of 148.0 denier/60 filaments.

The crystallinity of the spun yarn for the high shrinkage component was 31%.

After circularly knitting the obtained mixed yarn using a circular knitting machine, Eastm
2% O of an Polyester Blue GLF
As a result of staining with Wf, the two components could not be distinguished with the naked eye.

The high shrinkage component was drawn separately, circularly knitted separately without being mixed with the low shrinkage component, dyed in the same bath, and compared. As a result, the difference in dyeing was 2nd grade.

The above mixed fiber yarn was evaluated as a dyed finished fabric in the same manner as in Example 1, and the results were extremely excellent.

Example 4 The low shrinkage component of Example 2 was used as the low shrinkage component.

The high shrinkage component was obtained by further stretching the low shrinkage component at a stretching temperature of 85° C., a stretching speed of soom/m, and a stretching ratio of 1.15 times.

As a result of blending and circular knit dyeing of the obtained two components by the method of Example 1, no difference in dyeing between the two components could be discerned with the naked eye.

Furthermore, the results of the weaving dynamometer evaluation showed that there was no irritation, and the texture and
It had excellent gloss and drapability.

Comparative Example 1 The low shrinkage component of Example 1 was used as the low shrinkage component.

On the other hand, the same polymer as the low shrinkage component was extruded using the same die and the same spinning temperature, and wound at a spinning speed of 3000 m/-.
．． A multifilament yarn of 5 denier/24 filaments was obtained.

The submersion shrinkage rate of the obtained multifilament yarn was 20%.
The crystallinity was zero.

This spun yarn was stretched at a temperature of 85°C and a speed of 500 m/l.
A multifilament yarn of 40.5 denier/24 filaments was obtained by drawing at a drawing ratio of 1.76 times.

The submerged shrinkage rate of the obtained multifilament yarn was 13%, and this was used as the high shrinkage component.

Next, the low-shrinkage component and the high-shrinkage component were mixed in the same manner as in Example 1, and evaluated using the same evaluation method. As a result, the two mixed fiber components could be clearly distinguished with the naked eye, and were separately dyed in circular knitting. The comparison result was grade 3.5.

As a result of evaluating the same fabric as in Example 1 using this mixed fiber yarn,
The texture and drapability were very good, but there was a large difference in dyeing between the two components of the mixed fiber, and some irritation was observed on the surface.

Comparative Example 2 The low shrinkage component used in Example 2 was used as the low shrinkage component.

On the other hand, as a high shrinkage component, a multifilament yarn of 50.3 denier/24 filaments extruded from the same polymer, the same die, and the same spinning temperature as the low shrinkage component and wound at a spinning speed of 4000 m/- was used without drawing. The fibers were mixed in the same manner as in 2.

The submergence shrinkage rate of the high shrinkage component was 8.5%, and the shrinkage behavior was as shown in B in Figure 3.

Next, as a result of weaving according to the same specifications as in Example 1, the fabric had many weaving steps, weft sink marks, and warp stripes, and the quality of the fabric was very poor.

[Brief explanation of the drawing]

Figure 1 is a graph showing the relationship between spinning speed and submerged shrinkage rate of spun yarn, Figure 2 is a graph of strength elongation and primary yield point,
Figure 3 is a graph showing shrinkage behavior, Figure 4 is a graph showing crystallinity, Figure 5 is a diagram explaining the method for measuring crystallinity in Figure 4, Figures 6 and 7 are FIG. 2 is a side view showing an example of a spinning device for spinning component yarns and a drawing/mixing device for producing mixed yarns according to the present invention.

Claims (1)

[Claims] 1 Single fiber denier is 3 de or less, diving shrinkage rate is 4%
Polyester multifilament yarn spun at the following spinning speed of 4500 m/- or more and single fiber denier 3d
e, the spinning speed is 4 so that the submerged shrinkage rate is 6% or more.
1. A method for producing a polyester blend yarn, which comprises blending polyester multifilament yarns that have been spun at a speed of 000 m/- or more and drawn at a draw ratio of 1.1 to 1.7 times.