JP2610207B2 - Manifest bulky thread - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposed bulky yarn, and more particularly to a polyester multifilament exposed bulky yarn suitable for obtaining a thick fabric having dry touch, drape, bulky and sharpness.

[0002]

2. Description of the Related Art In general, as a method for imparting a dry feeling to a yarn, there is known a method of increasing the thickness of a constituent single fiber, applying a strong twist, using a modified cross-section yarn, or incorporating fine particles into a polymer. Have been.

In order to impart a drape property and a bulky property in addition to a dry feeling, in the case of a thin fabric, the distance between fibers and / or
Alternatively, a method of giving a difference in shrinkage in a fiber is known.
As an example, according to the method disclosed in JP-A-3-59130, a polyester multifilament containing 1.3 to 10.0% by weight of a matting agent is drawn under different heat treatment conditions, and shrinks in the yarn. The difference is given.

[0004] However, this yarn is a yarn for thin fabrics and has a maximum of 80 denier. These techniques are effective for thin fabrics, but have a drawback that sufficient effects cannot be achieved for thick fabrics with a large basis weight due to the effect of fiber binding force.

That is, in the case of a thin fabric, even if a flat yarn having no difference in yarn foot in appearance is used, if there is a difference in shrinkage in the yarn, bulky property can be exhibited in the dyeing process. However, in a thick fabric, the fibers are in a state of being compactly bundled as a whole, and it is difficult to exhibit bulkiness with a slight difference in shrinkage. Therefore, as a method that is often used, a woven fabric obtained by using a Taslan nozzle is used as an apparent bulky yarn to which a large number of loops are applied, and then a woven fabric obtained by this method is provided with a gusset by a loop, a fastener development, and a neck winding structure. It has many disadvantages, such as cored texture.

[0006] In addition, when a thick fabric is formed using false twisted yarn, plastic crimped texture is superimposed, and not only a thick fabric which is far from a high-class feeling, but also glitter due to fiber deformation at the time of false twist is generated, Significantly degrades quality.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparent bulky polyester multifilament yarn for heavy-weight fabrics having good dry touch, drapability, bulkiness and vivid color.

[0008]

According to the present invention, an undrawn polyester multifilament containing 2 to 10% by weight of inorganic oxide fine particles is used as a sheath yarn component, and a half yarn containing 2% by weight or less of inorganic oxide fine particles is used. Using a drawn polyester multifilament as a core yarn component, the two multifilaments were simultaneously entangled, and then the drawing tension applied to the core yarn component was obtained by drawing at a higher state than that of the sheath yarn component.
The apparent yarn foot difference is 2 to 8%, and the yarn foot difference after boiling water shrinkage is 5 to 25.
%, And a single fiber denier of a sheath yarn component is larger than a single fiber denier of a core yarn component.

In the present invention, Japanese Patent Publication No. 63-1649
As disclosed in JP-A No. 4 (1999) -2002, two yarns having different drawability, ie, an undrawn yarn and a semi-drawn yarn, that is, an undrawn polyester multi-filament as a sheath yarn component and a semi-drawn polyester multi-filament as a core yarn component And confound. Examples of the confounding method include a method using a normal interlace nozzle or a Taslan nozzle. At this time, the air pressure is 1 to 5 kg / cm ² , the relaxation rate is 0.5 to 4%, and confounding at an interlace degree of about 60 to 150 / M may be performed under conditions that do not induce fluff or breakage.

The effect of the confounding has a role of preventing breakage of the sheath yarn component during stretching and of separating the core yarn component and the sheath yarn component after winding. The entangled yarn is preheated by causing the heating roller to make 3 to 10 turns. The preheating temperature is
The temperature may be any temperature at which the sheath yarn component is flow-drawn. For that purpose, it is important to increase the heating roller temperature by increasing the stretching speed. The stretching speed used in the present invention is preferably 200 to 1,000 m / min, and 90 to 15 m / min.
A temperature of 0 ° C. is suitable.

[0011] In a state where flow drawing is not performed, not only a thick and thin yarn is formed and the dyeing is performed, but also uneven spots in boiling water are generated between the single fibers and in the yarn axis direction, so that a uniform apparent bulky yarn is not obtained. When the flow stretching is carried out only with the sheath yarn component, it adheres closely to the heating roller, and when it is severe, it is wound up by the heating roller, and the thread is broken before reaching the stretching. In addition, since it is weak in terms of stress, it cannot withstand the tension at the time of winding and unevenness in elongation occurs, and it is difficult to obtain uniform physical properties by itself.

In the present invention, since the core yarn component is simultaneously drawn, a uniform flow-drawn sheath yarn component having no thickness unevenness, elongation unevenness or shrinkage unevenness can be obtained without any problem. Of course, it can withstand the winding tension sufficiently.

In this case, in order to control the shrinkage of the fiber, it is preferable that the drawing is performed through a non-contact type heater heated to 160 to 270 ° C. On the other hand, when a contact type heater is used, the temperature is set to 120 to 250 ° C., which is lower than this. The stretching ratio is set in accordance with the low elongation side, that is, the core yarn component. At the same time, the sheath yarn component drawn at the same time is not sufficiently drawn, is flow drawn, and has a very weak elastic recovery force at the time of winding. Conversely, the core yarn component is stretched at an appropriate stretching ratio, the stretching tension is very high, and the elastic recovery force at the time of winding is large, so that a yarn foot difference occurs with the sheath yarn component. That is,
It is an apparent yarn foot difference. Naturally, the larger the elastic recovery force, the shorter the elastic recovery force, and the smaller the elastic recovery force, the longer the elastic recovery force.

Here, the adjustment of the apparent yarn foot difference is as follows. When the draw ratio is reduced, the stretching tension of the core yarn component is reduced, and the elongation elastic recovery force is also weakened, and the tension difference with the sheath yarn component is small.
Overt yarn differences are reduced. Conversely, when the draw ratio is increased, the tension increases, and the difference in tension with the sheath yarn component increases, thereby increasing the apparent yarn foot difference.

The apparent bulky yarn is obtained because the sheath yarn component is a region where the change in the stretching tension is small even if the draw ratio is slightly changed, and there is almost no change in the stretch elastic recovery force.

In the above process, when the undrawn yarn as the sheath yarn component and the semi-drawn yarn as the core yarn component are simultaneously drawn, the temperature of the heating roller used for preheating and the temperature of the heater used for shrinkage setting during the drawing are adjusted. This allows the core yarn component to have a high shrinkage and the sheath yarn component to have the same or a low shrinkage or self-elongation as that of the core yarn component.

A method of obtaining such apparent bulky yarns having different boiling water shrinkage rates will be specifically described with reference to the drawings. FIG. 1 shows the relationship between the heating roller temperature and the boiling water shrinkage ratio when the draw ratio is 1.8 times and the temperature of the non-contact heater for shrinkage setting is 220 ° C. in the yarn use of Example 1 described later. Things. As shown in FIG. 1, at a heating roller temperature of 90 ° C., the boiling water shrinkage ratios of the core yarn component and the sheath yarn component are reversed. Therefore, it is possible to prepare a bulky yarn having a higher boiling water shrinkage ratio of the core yarn component at a heating roller temperature of 90 ° C. or higher.

FIG. 2 shows the relationship between the temperature of the non-contact heater for shrinkage setting and the boiling water shrinkage when the stretching ratio is 1.8 times and the temperature of the heating roller is kept at 90 ° C.
It can be seen that the rate of decrease in the boiling water shrinkage due to the temperature change of the shrinkage non-contact heater is smaller than the effect of the heating roller temperature.

The apparent bulky yarn thus obtained has a yarn foot difference of 2 to 8%, and a yarn foot difference after boiling water shrinkage of 5 to 25.
%, And the single fiber denier of the sheath yarn component is larger than that of the core yarn component, preferably 1 to 5 denier.

[0020]

The apparent bulky yarn of the present invention contains 2 to 10% by weight of inorganic oxide fine particles and is usually 2,000 m / m2.
When unstretched polyester multifilament obtained at a spinning speed of preferably 1,000 m / min is used as the sheath yarn component, a part of the inorganic oxide fine particles are dispersed in the surface layer portion of the sheath yarn and project to form irregularities. Then, a bulky yarn with a dry touch texture can be obtained.

Further, when subjected to a chemical treatment such as alkali weight reduction, some of the fine particles fall off, but there are also residual fine particles.
In the meantime, the unevenness difference increases. In addition, due to the treatment, the flat surface layer containing no fine particles is roughened by the influence of the chemical, and the feeling changes from a slimy plastic touch to a touch like dry sand. That is, a dry touch can be expressed.

The amount of the inorganic oxide fine particles contained in the sheath yarn component is 2 to 10% by weight based on the weight of the fiber. When the content of the inorganic oxide is less than 2% by weight, the effect of roughening the surface layer and enlarging the unevenness is small, and a dry touch is not felt. On the other hand, if it exceeds 10% by weight, the unevenness becomes very large and a strong dry touch is obtained, but the spinning and stretching properties are inferior and fluff is frequently generated. In addition, the dull tendency becomes strong, and it becomes difficult to obtain sharpness. From this point, considering the balance between dryness, clarity and spinning / drawing,
The added amount of the fine particles is preferably 2.5 to 5% by weight.

A typical example of the inorganic oxide fine particles is titanium oxide. The particle size is preferably 0.5 μm or less, which is usually used as a matting agent, and more preferably 0.3 μm or less.
μm or less.

On the other hand, the core yarn component contains 2% by weight or less of inorganic oxide fine particles, and is usually 2,500 to 4,000.
By using a semi-drawn polyester multifilament obtained at a spinning take-off speed of 0 m / min, the whole core yarn is kept strong. In this case, if the addition amount of the inorganic oxide fine particles is increased, the spinning / drawing property, the color developing property, and the homochromaticity with the sheath yarn component are reduced. Is not more than 2% by weight, preferably 0.2%
Should be kept at ~ 0.5% by weight.

The apparent bulky yarn form generated by utilizing the difference in elastic recovery due to the stretching between at least two yarns is a microwave-like shape in which each filament of the sheath yarn component protrudes on the yarn surface with a different amplitude individually. And
It is a flat yarn type, which is neither a looped Taslan yarn nor a false twist yarn, and has no habit. In other words, the sheath yarn component having a large yarn foot difference with a large non-glitter effect is often in the form of an arc, and the arc-shaped fiber is entangled with the core yarn component, there is no yarn displacement, and it is a visible bulky yarn with good handleability. is there.

Here, the role of the requirement of the apparent yarn foot difference of 2 to 8% plays a role in preventing the fibers from adhering to each other in the woven fabric and creating a fiber void. This is to facilitate the movement of the fibers even in a heavy-weight fabric having a strong binding force. In addition, a part of the sheath yarn component located on the surface of the woven fabric is easier to move, and serves to remove a slimy feeling and a smooth feeling. In addition, when the apparent yarn foot difference is less than 2%, the yarn disappears or decreases due to the tension in the weaving process, and only a woven fabric having insufficient bulky property is obtained. On the other hand, when the content exceeds 8%, not only the high-speed weaving property is inferior, but also yarn separation occurs partially, which may cause deterioration in quality.

Then, this apparent bulky yarn is formed as shown in FIG.
2 is adjusted so that the yarn foot difference after shrinkage of boiling water is further 5 to 25 % . The reason is that when the yarn foot difference after boiling water shrinkage is less than 5%, no improvement in the woven fabric void due to the apparent yarn foot difference imparted at the time of winding is observed, while on the other hand, when the yarn foot difference exceeds 25%, tension is increased. The waist is reduced, the feeling of heavyness required for thick fabric is reduced, and the light fluffy material found in thin silky fabric is obtained. If there is a difference between the boiling water shrinkage ratio of the sheath yarn component and the boiling water shrinkage ratio of the core yarn component, the yarn foot difference that has become apparent when the film is wound can be further increased. At that time, it is necessary that the boiling water shrinkage of the core yarn component is higher than that of the sheath yarn component. On the other hand, the boiling water shrinkage ratio of the sheath yarn component may be lower or self-extensible. The use of such a difference in the boiling water shrinkage can be effectively used only when there is an apparent yarn foot difference.

In the apparent bulky yarn of the present invention, as described above, the constituent single fibers of the sheath yarn component individually envelop the core yarn with a microwave or arc amplitude. This structural feature also overcomes the adverse effects of using inorganic oxide fine particles. In other words, the greige machine composed of the yarn containing the inorganic oxide fine particles causes a “hit” defect due to the rubbing between the fabric and the facilities or between the fabrics in the relaxing dyeing finishing process. However, in the present invention, since the sheath yarn component is in an intermediate orientation state by stretching, it is soft and has no "hit", and therefore has a high yield and can be used for most dyeing equipment.

In general, when the amount of the inorganic oxide fine particles increases, the tendency of dulling increases, and the sharpness generally decreases. In the apparent bulky yarn of the present invention, since the sheath yarn component is in an intermediate orientation state, the dye adsorption is large, and the inside of the fiber is dyed, good sharpness is obtained even if the amount of the inorganic oxide fine particles is larger than that of the conventional yarn. Is obtained.

Furthermore, since the core yarn component and the sheath yarn component have a higher dyeing speed and the core yarn component begins to be dyed later, even if the sheath yarn component contains a large amount of inorganic oxide fine particles. One of the features of the present invention is that the dye is more clearly dyed than the core yarn component.

Further, since the single fiber denier of the sheath yarn component is larger than the single fiber denier of the core yarn component, irregular reflection can be suppressed as much as possible, and the tendency to dull can be prevented.

[0032]

The present invention will be described in more detail with reference to the following examples. In addition, the measurement of various characteristic values followed the following. The number of confounding points in a test length of 1 m for measuring the degree of interlace is counted. The initial load applied to the test length is 1/30 g / d, and a load of 1/30 g / d is attached to the needle hook inserted into the sample. The needle hook is inserted from above and the number of stops is defined as the degree of interlace (（/ M).

Measurement of yarn foot difference 10 cm of the apparent bulky yarn was collected, a 1/30 g / d load was hung on the lower yarn end of the apparent bulky yarn, and cut at 2 cm from the top and 7 cm from the top. Then, 5cm
Sampling at the test length of Each of the obtained single fibers is applied with a load of 1/30 g / d to measure the length thereof, and the yarn foot difference is determined by the following formula. Yarn difference (%) = [(average length of sheath yarn component single fiber−average length of core yarn component single fiber) / average length of core yarn component single fiber] ×
100

Measurement of yarn foot difference after boiling water shrinkage The apparent bulky yarn was wrapped in gauze, wrapped in gauze, immersed in boiling water for 20 minutes, taken out of the gauze, lightly dried with filter paper, and air-dried for 24 hours. And in the manner described above.

Measurement of Boiling Water Shrinkage Ratio Ten single fibers of the core yarn component or the sheath yarn component are pulled out from the apparent bulky yarn, cut into 10 cm, and each single fiber is suspended with an initial load of 1/30 g per denier. 5cm
Marking is performed at intervals. After that, it was immersed in boiling hot water for free for 10 minutes, treated, taken out, allowed to stand at room temperature for 24 hours, air-dried, and suspended under an initial load.
The length was read and determined by the following equation.

Boiling water shrinkage (%) = [(length before treatment) −
(Length after treatment) / Length before treatment] × 100 The boiling water shrinkage of the core yarn component and the sheath yarn component was represented by an average of 10 boiling water shrinkage ratios obtained by the above formulas.

Example 1 As a sheath yarn component, a polyester containing 3% by weight of titanium oxide having an average particle diameter of 0.3 μm was spun at 1,000 m / min to obtain a birefringence (Δn) of 0. 0.0004 undrawn yarn (150 denier / 24 filaments) is spun at a spinning speed of 3,300 m / min of a polyester containing 0.3% by weight of titanium oxide having an average particle diameter of 0.3 μm as a core yarn component. The obtained semi-stretched yarn (120 denier / 36 filaments) having a birefringence index (Δn) of 0.04 was prepared, and these two multifilaments were prepared in a stretching machine. / Dot-on interlaced nozzle, type X
The mixture was passed through −33 and entangled with a compressed air pressure of 3.0 kg / cm ² , and was preheated by a heating roller rotating at a peripheral speed of 444 m / min for 6 turns. The temperature of the heating roller at this time is 1
At 10 ° C, the degree of interlace was 95 / M. After the preheating, the film was passed through a non-contact heater set at 220 ° C. to perform a stretching setting. At this time, the film was wound at a stretch ratio of 1.8 times.

The obtained apparent bulky yarn had a density of 152 denier / 60 filaments, a degree of interlace of 34 fibers / M,
The apparent yarn foot difference is 7%, and the birefringence (Δn) of the sheath yarn component is 0.
08, boiling water shrinkage 4%, birefringence of core yarn component (Δn)
Was 0.165, the boiling water shrinkage was 6%, and the yarn foot difference after the boiling water shrinkage was as large as 9%. The single-fiber denier of the sheath yarn component was 3.5 denier, the single-fiber denier of the core yarn component was 2.0 denier, and the sheath yarn component was large.

The apparent bulky yarn has an S twist of 1,000 T /
Twisted with a number of twists of M, set at 70 ° C. for 30 minutes with a vacuum dryer, and used for warp and weft yarns.
Two twill fabrics were woven. Vertical density at the end of greed machine is 1
The number of pieces was 34 pieces / inch and the weft density was 80 pieces / inch. The weaving was performed at 450 rpm using a water jet loom, and the weaving performance showed no problem.

After the greige was washed with water and air-dried at 25 ° C., the warp yarn was taken out, and the apparent yarn foot difference was measured. As a result, the difference was slightly reduced to 4%. As for the surface touch, a refreshing touch due to the floating structure of the sheath yarn component and a dry feeling due to the effect of containing titanium oxide were good. Also, tension,
The waist was sufficient, and the drape property and bulky property were also sufficient.

The greige was placed in boiling water at 100 ° C. for 15 minutes.
After preliminarily relaxing, the mixture was relaxed at 120 ° C. for 40 minutes with a circular device, air-dried, and set in a vertical and horizontal direction with a 185 ° C. pin tenter at a relaxation of 5% each for 45 seconds. The woven fabric after this setting is treated with a caustic soda 3.5% solution,
Treated at 100 ° C for 20 minutes to prepare a treated cloth with a weight loss rate of 15%, neutralized this caustic soda, and made Eastman Polyester Blue 2GL dye a 6% dye liquor based on the weight of the cloth. After dyeing for 45 minutes, washing with water and air-drying, relax again with a pin tenter in vertical and horizontal directions 5% each
And set at 160 ° C. for 45 seconds to obtain a basis weight of 200 g / m ^2.
Got the product.

From this product, the warp yarn was loosened and separated into a core yarn component and a sheath yarn component.
The yarn foot difference was greatly improved as compared with the yarn foot difference of 9% after boiling water shrinkage measured at the greige stage. This is because the sheath yarn component self-elongated from the contracted state due to scouring treatment, presetting, high-temperature dyeing and heat history.

As described above, even though it is an apparent bulky yarn, the fiber gap in the greige is further expanded by passing through the dyeing finishing process, and the drape property and bulky property developed due to the gap in the finished product are extremely large. , The surface touch also became strong due to the weight loss effect, but it was not only hard but also supple due to the large difference in yarn foot, making it a good luxury fabric with a dry touch but a great touch feeling Was. In addition, it is possible to obtain a fabric with good sharpness in which the sheath component shows a clear color, is dyed darker than the core yarn component, and does not feel any dull tendency peculiar to the fiber containing a large amount of titanium oxide. did it.

Example 2 As a sheath yarn component, a polyester containing 6% by weight of titanium oxide having an average particle diameter of 0.3 μm was spun at a spinning speed of 1,800 m / min. 0.0008 undrawn yarn (150 denier / 16 filaments) is spun at a spinning speed of 4,500 m / min of a polyester containing 0.03% by weight of titanium oxide having an average particle diameter of 0.3 μm as a core yarn component. The obtained semi-drawn yarn (100 denier / 36 filament) having a birefringence (Δn) of 0.092 was prepared.
The two multifilaments were set on a drawing machine to align the two yarns, and then passed through a cot roller rotating at a peripheral speed of 645 m / min, and subsequently passed through a DuPont Taslan nozzle, T-42. While being entangled at 5 kg / cm ² , preheating was performed by applying 8 turns to a heating roller rotating at a peripheral speed of 615 m / min. At this time, the temperature of the heating roller was 140 ° C., and the degree of interlace was 120 / M.
After the preheating, stretching and heat setting were simultaneously performed.
The stretching ratio was 1.3 times and the heating plate temperature was 240 ° C.

The apparent bulky yarn thus obtained was 195 denier / 52 filaments, the degree of interlace was 45 / M,
The apparent yarn foot difference was 6%, and about half of the filaments of the sheath yarn component were in a state of sagging in an arc shape. The birefringence (Δn) of the sheath yarn component is 0.011, and the boiling water shrinkage is 3%, while the birefringence (Δn) of the core yarn component is 0.170 and the boiling water shrinkage is 3%.
%, The yarn foot difference after boiling water shrinkage is as large as 8%, the single fiber denier of the sheath yarn component is 7.2 denier, the single fiber denier of the core yarn component is 2.2 denier, and the denier of the sheath yarn component is Was about three times as large as that of the core yarn component.

The apparent bulky yarn is subjected to 150 T / M in the S direction.
This was used as a warp yarn and a weft yarn, and a plain woven fabric was woven in a water jet loom to obtain a green fabric having a warp density of 98 yarns / inch and a weft density of 100 yarns / inch.

The greige machine was subjected to the same dyeing and finishing process as in Example 1 to obtain a dyed product. 180g / m
^{Was 2} . From this product, the warp yarn was loosened and separated into a core yarn component and a sheath yarn component.
This is a significant increase in the yarn foot difference of 5% in the raising of the greige machine. This increase in yarn foot difference is caused by the fact that the core yarn component shrinks more and more while passing through the dyeing finishing process, and conversely, the sheath yarn component self-stretches, which is a property of the intermediate oriented yarn, so that the yarn in the dyed finished product can be obtained. This is the result of the difference in footsteps being greater than that of the greige machine.

The obtained product had a single fiber denier of 7.2% and a very strong dry touch, and also had the softness of the middle oriented yarn in spite of the thick denier. And almost no lumpy feeling was felt. In addition, despite the high content of titanium oxide, the sheath yarn component has good clarity even compared to the core yarn, and the whole is rich in crispness and rich in bulkiness, despite its high content of titanium oxide. It was a thick fabric.

Comparative Example 1 As a sheath yarn component, a polyester containing 3% by weight of titanium oxide having an average particle diameter of 0.3 μm was spun at a spinning speed of 1,000 m / min. 0.0004 undrawn yarn (300 denier / 24 filaments) is spun at a spinning speed of 1,000 m / min from a polyester containing 0.3% by weight of titanium oxide having an average particle diameter of 0.3 μm as a core yarn component. The obtained unstretched yarn (300 denier / 48 filaments) having a birefringence (Δn) of 0.004 was prepared, and the two multifilaments were set on a stretching machine. Non-contact heater temperature 220
After setting the draw ratio to 3.0 ° C. and simultaneously passing through a heating roller, the sheath yarn component was shrunk and set, while the core yarn component was stretched without shrinking and then used in Example 1. Using the same interlace nozzle, compressed air pressure 3kg /
After being entangled at 1.5 cm ² and a relaxation rate of 1.5%, it was wound up to obtain a different shrinkage mixed fiber. This mixed fiber is 200 denier / 70
The boiling water shrinkage of the filament and sheath yarn components was 6%, the boiling water shrinkage of the core yarn component was 16%, and the apparent yarn foot difference was 0.5%.

After applying a twist of 150 T / M to this hetero-shrinkage mixed fiber, it is used as a warp yarn and a weft yarn to produce a plain weave having a warp density of 99 yarns / inch and a weft density of 100 yarns / inch. And This plain fabric was subjected to the same steps as in Example 1 to obtain a dyed product. The finished weight of this product was 178 g / m ² .

This product was a woven fabric having a small dry feeling due to a plastic touch with a smooth surface, and a small drape and bulkiness. Further, it had a very strong dull tendency, and the sharpness was remarkably lacking. As a precautionary measure, the warp yarn was loosened from this product, and the yarn foot difference between the core yarn component and the sheath yarn component was measured to be 2%.

[0052]

The apparent bulky yarn of the present invention has the characteristics of the aggregate thereof and the disadvantage that the sheath yarn component contains a large amount of inorganic oxide fine particles because the sheath yarn component is in a semi-drawn state. While expressing a dry touch. Also,
Due to the apparent yarn foot difference, voids can be provided in the obtained woven fabric, and by expanding the voids in the dyeing and finishing process, the drape property and bulky properties that were lacking in conventional thick fabrics are simultaneously satisfied Woven fabric can be obtained.

Further, it is possible to achieve both sharpness and dry touch which have been difficult in the prior art, while eliminating the tendency of the fiber containing a large amount of inorganic oxide fine particles to be a drawback of the fiber. .

[Brief description of the drawings]

FIG. 1 is a graph showing a relationship between a heating roller temperature and a boiling water shrinkage ratio when a stretching ratio is 1.8 times and a non-contact heater temperature for shrinkage setting is constant at 220 ° C.

FIG. 2 shows the relationship between the temperature of the non-contact heater for shrinkage setting and the boiling water shrinkage rate when the stretching ratio is 1.8 times and the heating roller temperature is kept constant at 90 ° C.

Continued on the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location D02J 1/00 D02J 1/00 R 1/22 1/22 P D03D 15/00 D03D 15/00 Z (72) Inventor Fumiyoshi Hirano 3-4-1 Mihara, Ibaraki-shi, Osaka Teijin Limited Osaka Research Center (56) References JP-A-3-59130 (JP, A) JP-A-57-199832 (JP, A)

Claims (1)

(57) [Claims] An undrawn polyester multifilament containing 2 to 10% by weight of inorganic oxide fine particles as a sheath yarn component, and a semi-drawn polyester multifilament containing 2% by weight or less of inorganic oxide fine particles as a core yarn component. After the two multifilaments were simultaneously entangled, the drawing tension applied to the core yarn component was higher than that of the sheath yarn component, and the actual yarn foot difference was 2 to 8%.
An apparent bulky yarn characterized in that the yarn foot difference after boiling water shrinkage is 5 to 25%, and the single fiber denier of the sheath yarn component is larger than the single fiber denier of the core yarn component.