KR20170040396A - Polyester Complex Ball Fiber That Is Good For Strain Repeated Compression Recovery Rate - Google Patents

Abstract

The present invention relates to a method for producing a polyethylene terephthalate polymer, wherein a polytrimethylene terephthalate polymer or a polybutylene terephthalate polymer is constituted by a side by side type, The side by side type is a shape of a hollow composite yarn, an annular shape in cross section, a circular hollow portion of 5 to 30% of the total area is formed at the center of the cross section, and the repeated compression recovery ratio And a reduction ratio of 3.0 to 5.0%.

Description

[0001] The present invention relates to a polyester-based ball fiber,

The present invention relates to a polyester-based ball fiber excellent in repeated compression recovery rate and excellent in shape stability and excellent in repeated compression recovery ratio before and after washing.

As outdoor clothing becomes popular, when outdoor winds are blowing, everyone can take out the goose down or duck down jumper to maintain the body temperature. Outdoor products are already in the deep part of our life. , Consumers have begun to demand outdoor products that are more suitable for everyday life than high-priced, warm-keeping high-end products for extreme environments.

As a result of these trends, winter outdoor products are being developed for outdoor products that are thin, lightweight, lightweight, windproof, breathable and highly functional outdoor products, and their popularity is increasing day by day.

Most of the cold weather products currently on the market are heat insulation by the air layer, which causes the activity to be lowered as a reason to increase the thickness of the fabric constituting the covering, and the feathers (feather, Is deteriorated due to agglomeration and exudation during washing and it is not good for cosmetics. In addition, the form of pulling feathers from ducks and goosebumps is causing discomfort in animal protection groups. Due to the nature of natural materials, there is a concern that odor is generated, and there are many inconveniences in terms of management such as washing.

Accordingly, in order to satisfy consumer needs of various classes, it is required to develop a general-purpose outdoor product having superior functionality and price competitiveness and domestic materials for such outdoor products.

Korean Patent No. 1183949 discloses a padding for warming which is formed by laminating synthetic fibers and mammalian hairs together. The padding made a multi-layered insulating material made by laminating a synthetic fiber layer, a layer of a mixture of a mammalian hair and a synthetic fiber, and made a formally stable insulating material having a proper thickness without aggregation or fiber exudation. However, The process is troublesome because a separate facility for supplying mammal hair is added, and the merit of the mammal hair is mixed with the synthetic fiber to reduce the merit of the moth, and the price competitiveness is lower than that of a general synthetic thermal insulator.

In addition, Korean Patent No. 1414206 discloses a C-type hollow fiber which has an improved hollow ratio to maximize the effects such as heat insulation and light weight, but it is inconvenient to carry out a post- (IV), and there is no curl property.

In addition, general synthetic fillers are produced in a uniform form by laminating short fibers, and when they are used in clothes such as padding, aggregation may occur, and the recoverability is deteriorated when they are used for a long time.

In addition, when it is used for clothes, particularly in repetitive compression, there is a growing interest in a ball fiber that has a restoring force that affects a thermal insulation effect, that is, an excellent repulsive compression resilience.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a polyester-based hollow composite yarn which can be used in an environmentally friendly ball shape and a ball fiber for a warming filler using the same.

It is another object of the present invention to provide a ball fire which is composed of a hollow composite yarn which can contain an air layer so as to have excellent warmth.

Another object of the present invention is to provide a side-by-side bicomponent composite yarn having an intrinsic viscosity (IV) difference so that the hollow composite yarn can be easily wound into a ball shape and a ball fiber for a warm- do.

Further, the present invention aims to provide a ball fiber for a filling material having excellent restoring force even when used after repetitive compression storage and washing.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a method of producing a polytrimethylene terephthalate polymer or a polybutylene terephthalate polymer in a side by side manner by adding a polytrimethylene terephthalate polymer or a polybutylene terephthalate polymer to a polyethylene terephthalate polymer, the side by side type is in the form of a hollow composite yarn, the cross section is annular in shape, the circular hollow portion is formed at the center of the cross section by 5 ~ 30% of the total area, The present invention provides a polyester-based ball fiber excellent in repeated compression recovery rate with a reduction rate of repeated compression recovery rate before and after washing using 3.0 to 5.0%.

The polyethylene terephthalate polymer has an intrinsic viscosity of 0.45 to 0.65 dl / g, a polytrimethylene terephthalate polymer has an intrinsic viscosity of 0.9 to 1.1 dl / g, and a polybutylene Wherein the polybutylene terephthalate has an intrinsic viscosity of 0.8 to 1.2 dl / g.

The present invention is also characterized in that the weight ratio of polytrimethylene terephthalate polymer or polybutylene terephthalate polymer to the polyethylene terephthalate polymer is 4 to 6 to 6 to 4, A polyester-based ball fiber excellent in repeated compression recovery rate is provided.

The present invention also provides a polyester-based ball fiber excellent in repetitive compression recovery rate, characterized in that the polyester-based staple fiber has a monofilament fineness of 1.5 to 15 denier and a fiber length of 10 to 100 mm.

In addition, the present invention provides a polyester-based ball fiber excellent in repeated compression recovery property, characterized in that the polyester-based ball fiber is excellent in shape stability and does not easily cause aggregation before and after washing.

The present invention also provides an article of clothing using a polyester-based ball fiber excellent in repeated compression recovery as a filler.

The ball-shaped ball fibers for a warm-up filler having a ball shape using the polyester-based hollow composite sintered fiber according to the present invention are characterized by having a hollow ratio and a crimp phenomenon using a bicomponent polyester hollow composite yarn, not only has a high fill power but also excellent resilience even after repetitive compression storage and washing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a fiber of a warm-keeping filler having a conventional ball shape and a side-by-side form of a bicomponent composite hollow fiber of Comparative Example 3. FIG.
Fig. 2 is a cross-sectional view of a fiber of a warm-keeping filler having a conventional ball shape. Fig. 2 is a cross-sectional side view of a bicomponent composite yarn cross-section through two circular nozzles combined in Comparative Example 4. Fig.
3 is a conceptual diagram of a cross-section of a side-by-side type bicomponent hollow composite hollow fiber composite yarn of a polyester-based ball fiber composite yarn excellent in repeated compression recovery ratio according to the present invention.
4 is a cross-sectional view of a side-by-side type bicomponent hollow composite yarn of Example 3 as a polyester-based ball fiber hollow composite yarn excellent in repetitive compression recovery ratio according to the present invention.
FIG. 5 is a cross-sectional view of a spinneret for extruding a side-by-side bicomponent hollow composite yarn through a melt spinning process with a polyester-based ball fiber having an excellent repetitive compression recovery ratio according to the present invention.
6 is a cross-sectional view of a spinneret for extruding the side-by-side type bicomponent composite yarn of Comparative Example 4 through a melt spinning process
7 is a view showing a ball shape of a warmth filler according to an embodiment of the present invention.
FIG. 8 is a view showing changes in shape before and after washing according to the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts have the same reference numerals as much as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

As used herein, the terms " about, " " substantially, " " etc. ", when used to refer to a manufacturing or material tolerance inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-section of a fiber of a warm-keeping filler having a conventional ball shape and a cross-section of a side-by-side type bicomponent hollow composite yarn having a hollow ratio of 5%

Generally, when the enclosure ratio is high, the warmth is excellent. Insulating filler has better heat retention when it contains fibers with low thermal conductivity, and air has the lowest thermal conductivity and has excellent thermal insulation. In addition, the larger the hollow space in the fiber, the more excellent the light weight in addition to the warming property, and the wearer's feeling as a filling material of the garment can be improved.

Fig. 2 is a cross-sectional view of a fiber of a conventional warm-keeping filler with a side-by-side two-component composite yarn cross-section through two coupled circular saws. Refers to a yarn having a Bi-Component structure in which two kinds of polymers having different heat shrinkage components are discharged through a nip and bonded in a side-by-side shape. It has a snowman shape with two circular sections connected to each other. Each circular component is mainly composed of polyethylene terephthalate polymer and polytrimethylene terephthalate polymer. However, since there is no space in the fiber cross section for containing air, there is a problem in heat insulation, elasticity, lightweight, and the like.

FIGS. 3 and 4 are views showing a conceptual diagram and a cross-sectional view of a side-by-side two-component hollow composite yarn of a polyester-based ball fiber hollow composite yarn excellent in repetitive compression recovery according to the present invention.

The present invention relates to a method for producing a polytrimethylene terephthalate polymer or a polybutylene terephthalate polymer in a polyethylene terephthalate polymer as a side by side type,

The side by side type is a hollow composite yarn, the cross section is annular, the circular hollow portion is formed at the center of the cross section by 5 ~ 30%

And a reduction rate of the repeated compression recovery rate before and after washing using the hollow composite yarn is 3.0 to 5.0%.

The bicomponent hollow bicomponent yarn 100 is characterized in that it has wavy or spiral wrinkles.

Polytrimethylene terephthalate (120), which is one component of the bicomponent hollow bicomponent yarn (100), is abbreviated as PTT and is a kind of polyester yarn, which is a kind of polyester yarn, It is made better and refers to the skin-friendly yarn. It is a yarn applicable to potential crimp yarns, and has elastic characteristics such as nylon touch and spandex, and is excellent in breathability.

The other component, polyethylene terephthalate (PET) 110, is abbreviated as PET and is mainly used as synthetic fiber. In general, PET, which is a thermoplastic polymer, is extruded through a spinneret at a temperature higher than the melting point and cooled and solidified. It is used after spinning process.

Polybutylene terephthalate (PBT) is an abbreviation of PBT, and it is stretchable to 1.5 times the length, and it returns to its original length. . It does not lose elasticity even when wet, has soft feel and elasticity.

The cross-sectional shape of the hollow composite yarns arranged in the side by side type is an annular shape. The cross-sectional shape of the hollow composite yarn is a ball-shaped heat insulating filler having a circular hollow portion with an area of 5 to 30% .

1 and FIG. 2 showing a fiber cross-section as a conventional filler, the fiber cross-section of the present invention has a circular hollow space 130 at the center thereof as shown in FIG.

FIG. 5 is a cross-sectional view of a spinneret for extruding a side-by-side bicomponent hollow composite yarn through a melt spinning process with a polyester-based ball fiber having an excellent repetitive compression recovery ratio according to the present invention.

Further, the above-mentioned two components are extruded through a spinneret at a temperature higher than the melting point to cool and solidify. At this time, the spinneret has an annular shape as shown in Fig. 5, but has a characteristic in which the spinneret is divided at regular intervals between the first spinneret and the second spinneret.

On the other hand, Fig. 6 is a cross-sectional view of the spinneret of the hollow side-by-side type bicomponent fiber yarn without hollow.

Molten polyethylene terephthalate polymer is disposed on the upper ends 141 and 151 of each of the first spinneret 140 and the second spinneret 150 and poly The polytrimethylene terephthalate polymer may be eluted. In this process, the volume expands immediately after being extruded at a high pressure, and the distance between the two becomes narrower, resulting in an annular shape that is finally connected.

At this time, in order to obtain a connected annular shape with a narrow spacing, the same polymer should be used at the connection portion. If the separate polymer is eluted by spinneret, interfacial separation between the two polymers may occur, making it difficult to connect the annular shape.

After that, after cooling and solidification process, it becomes undeveloped company. The undrawn yarn thus melt-spun can be made into an end yarn through a stretching process in which the culture and crystallization are expressed in the fiber structure to give the strength to be the final fiber.

The desired fiber and hollow ratio can be obtained according to the size and thickness of the spinneret. On the other hand, when the annular shaped spinneret which is not separated from the beginning is used, the inner radius of the composite yarn is reduced in the process of expanding the volume inside and outside immediately after the high pressure extrusion, so that it may be difficult to have a desired hollow ratio.

7 is a view showing a ball shape of the warming filler according to an embodiment of the present invention. In the bicomponent hollow composite yarn obtained through the spinneret, there is a difference in degree of shrinkage after cooling and solidifying after extrusion due to the difference in intrinsic viscosity of each polymer.

Therefore, a crimp occurs in which the fibers are rounded in accordance with the difference in shrinkage ratio. As the intrinsic viscosity difference becomes larger, the crimp ratio becomes larger and the ball shape can be made small.

Therefore, it is preferable to use a polymer of two components in order to have a large difference in intrinsic viscosity. This is because the polymer of the same component may have a limited range of intrinsic viscosity.

FIG. 8 is a view showing changes in shape before and after washing according to the present invention.

The present invention relates to a polyethylene terephthalate polymer having an intrinsic viscosity of 0.45 to 0.65 dl / g, an intrinsic viscosity of a polytrimethylene terephthalate polymer of 0.9 to 1.1 dl / g, a polybutylene terephthalate (Polybutylene terephthalate) has an intrinsic viscosity of 0.8 to 1.2 dl / g.

Also, the weight ratio of polytrimethylene terephthalate polymer or polybutylene terephthalate polymer to polyethylene terephthalate polymer is preferably 4: 6 to 6: 4.

The polyester-based staple fiber of the warm-up filler having a ball shape according to the present invention has a draw ratio of 2.1 to 3.5. Stretching refers to stretching of molecules while passing through a roller with a high number of revolutions in a slow feed feed roller.

 Polymeric materials are generally solid, but their mechanical properties are highly dependent on the orientation of the polymer chain. When a polymer in a non-oriented state is stretched in a certain direction at a temperature higher than the second transition temperature, the polymer chains are oriented in the tensile direction thereof and their mechanical properties change. This operation is referred to as elongation, and the synthetic fiber filament spun is easily stretched even by a very small force, and the elongation does not return even if the tension is removed. It is because the polymers are amorphous. Thus, it is not practical as a fiber alone, but if it is stretched above the second transition temperature, the molecules are oriented in the direction of the fiber axis and become extremely elastic fibers.

The polyester-based staple fiber preferably has a monofilament fineness of 1.5 to 15 denier, a fiber length of 10 to 100 mm, and a ball-shaped heat-resistant filler using the staple fiber preferably has a fill power of 250 or more.

Generally, the fill factor and filling power differ depending on the fineness of the staple fibers used in the filler. When the filaments constituting the filler are three or more filaments, the heat resistance may be improved due to the high encapsulation efficiency. However, the filament fibers of the three filaments may be weak in elasticity and the fill power may be deteriorated. It is possible to increase the fill power because of the excellent elastic force, but the permeability can be lowered.

Therefore, the heat-insulating filler having the ball shape of the present invention can satisfy both the permeability and fill power by using short fibers having a fineness of 1.5 to 15 denier.

If the fiber length is too short or long, the polyester staple fiber may be difficult to form as a ball type filling material, or the shape stability may be deteriorated. Therefore, the fiber length of the staple fiber is preferably 10 to 100 mm.

In addition, the heat-resistant filler of the present invention is preferably formed in a ball shape so as to have a high filling ratio, excellent elastic recovery property, and a fill power of 250 or more.

Fill power or Filling power is a numerical value indicating how much the down weight (down volume) occupies the down weight. It is one of the value measures of down quality. The larger the fill power, the more amount of air can be filled with the same amount of down, which means that there is a greater amount of air pockets, which results in higher insulation and thermal insulation. Therefore, the higher the fill power is, the better the thermal insulation is.

Hereinafter, examples of producing a polyester-based ball fiber excellent in repetitive compression recovery ratio according to the present invention will be described, but the present invention is not limited to the examples.

Example 1

The intrinsic viscosity (IV) of the polyethylene terephthalate polymer (IV) 0.45 and the polytrimethylene terephthalate polymer (1.07) had an intrinsic viscosity (IV) of 1.02. The weight ratio of the polymer is 1: 1 and the composite fiber has a stretching ratio of 2.2 after stretching to obtain a composite fiber having a fineness of 3 denier. After that, the fiber is cut to obtain a 24 mm fiber filament. Thereafter, a ball-shaped polyester-based ball fiber is obtained by using short fibers.

Example 2

The conditions are the same as those in Example 1, but have a polyethylene terephthalate polymer intrinsic viscosity (IV) of 0.55.

Example  3

The conditions are the same as those of Example 1, except that the polyethylene terephthalate polymer has an intrinsic viscosity (IV) of 0.65.

Example  4

The conditions are the same as those in Example 1, except that the polyethylene terephthalate polymer has an intrinsic viscosity (IV) of 0.65 and polybutylene terephthalate is used instead of polytrimethylene terephthalate .

Comparative Example  One

The conditions are the same as those of Example 1, except that the binary polymer is polyethylene terephthalate, which has the same component (IV) as the same component, 0.65.

Comparative Example  2

The conditions are the same as those of Example 1, except that the same component (polyethylene terephthalate) has the intrinsic viscosity (IV) of 0.65 and 0.55, respectively.

Comparative Example  3

The conditions are the same as those of Example 1, except that the same component (polyethylene terephthalate) having the intrinsic viscosity (IV) is 0.65 and 0.50, respectively.

Comparative Example  4

The conditions are the same as those of the second embodiment, except that the spinning and detaching section is not an annular shape as shown in FIG. 5 but two circular shapes are connected as shown in FIG.

◎ Evaluation method of hollow rate

The ratio of void space to cross-section of melt-spun fiber.

◎ Ball size evaluation method

The melt-spun fiber measures the length of the diameter of the rounded ball shape.

◎ feather touch feeling evaluation method

As a kind of emotional evaluation, 10 experimenters evaluated the degree of tactile sensation in the blind state and divided into 1 to 5 grades, indicating that the higher the grade, the better the tactile sensation.

 ◎ Fill power evaluation experiment

 When a sample of 1 ounce (28.4 g) is put into a cylinder of 241 mm in diameter and compressed for 1 day at a weight of 3 ounces and the compression is removed, the recovered volume is measured. For example, when the recovered volume is 300 in 3 / oz Fill power 300, and calculate the average value of five evaluation tests per sample.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Example 2 Example 3 Example 4 Polymer 1 PET IV 0.65 PET IV 0.65 PET IV 0.65 PET IV 0.55 PET IV 0.45 PET IV 0.55 PET IV 0.65 PET IV 0.65 Polymer 2 PET IV 0.65 PET IV 0.55 PET IV 0.50 PTT IV
1.02 PTT IV
1.02 PTT IV
1.02 PTT IV
1.02 PBT IV
1.1 Hollowness (%) 14 8 5 none 12 15 19 18 Ball size
(Diameter mm) Malformed 5.3 5.3 3.5 3.5 4 5 5 feather touch 4 5 3 3.5 3 4 5 5 fill power 262 320 330 275 294 326 375 370 fiber specification Hollow section 3 denier, fiber length 24mm

 PET: Polyethylene terephthalate

 PTT: polytrimethylene terephthalate (PTT)

 PBT: Polybutylene Terephthalate (PBT)

As shown in Table 1, Examples 1 to 4 consisted of PTT or PBT binary components in PET and showed intrinsic viscosity (IV) difference of 0.57 to 0.37. The greater the difference in viscosity, the greater the degree of shrinkage after melt-spinning and the greater the shear strength can be.

The larger the difference in viscosity, the smaller the hollowness of the hollow composite yarn due to the asymmetric expansion in the expansion step after melt spinning. Therefore, it can be seen that the hollow ratio has the largest value of 19% in Example 3 in which the difference in intrinsic viscosity (IV) is the smallest. On the other hand, Example 1 has the largest viscosity difference of 0.57, and the ball size is 3.5 mm, which is smaller than Examples 2, 3, and 4.

On the contrary, Comparative Example 1 had the same intrinsic viscosity (IV) of the same component, so that the crimp ratio was poor and the ball shape was poor. In Comparative Examples 2 and 3, the difference in viscosity was only about 0.1 to 0.15, Although relatively large, the hollow ratio is relatively small, ranging from 5 to 8%. Fig. 1 shows a cross section of a composite hollow fiber having a hollow ratio of 5% of Comparative Example 3. Fig. The comparative example 4 is characterized in that there is no hollow ratio because there is a difference in the spinneret.

The feather touch is proportional to the size of the ball size as shown in Table 1.

As a filler, the higher the fill power value, the better the thermal insulation is. As shown in Table 1, the fill power value is related to the porosity and the ball size, and it is known that the higher the two values, the better the thermal insulation. It can be seen that the embodiment 3 in which the hollow ratio and the ball size are large has the highest fill power value.

 ◎ Evaluation of fill power by difference of stretching ratio

The stretching ratio refers to the ratio of the number of turns of the rear end roller to the number of revolutions of the feed roller with a slow rotation speed.

Example  5

The conditions are the same as those in Example 3, except that the stretching ratio is 2.4.

Example  6

The conditions are the same as those of Example 3, but the stretching ratio is 2.6.

Comparative Example  5

The conditions are the same as those in Example 3, except that the stretching ratio is 2.0.

division Example 3 Example 5 Example 6 Comparative Example 5 Stretching cost 2.2 2.4 2.6 2.0 feather touch 5 3 One 5 Ball size (mm) 5 4 3 Malformed fill power 375 330 290 305

The molecules stretched by the difference in stretching ratio are oriented in the direction of the fiber axis and become fibers having excellent elasticity. In Table 2, it can be seen that as the stretching ratio increases, the elastic ratio of the fibers increases, and as the crimp ratio increases, the ball size becomes smaller and the fill power decreases. In Comparative Example 5, the stretching ratio was 2.0, indicating that the elasticity of the fiber was small and the ball shape was poor. Thus, it can be seen that the embodiment 3 having the stretching ratio of 2.2 has the largest fill power value.

◎ Evaluation method of repeated compression recovery rate

(A) Measurement of height at initial load of 90g after air opening in air, repeated measurement up to 75% of initial height after repeated air compression. (B) do.

Repeat compression recovery rate (%) = (1- (a-b) / a) * 100

The washing process is repeated 15 times for 15 minutes after loosening the neutral detergent in warm water at 40 ° C.

◎ Evaluation method of fill power after washing

Fill power measurement instrument is used and measured before and after washing. Washing is performed after laminating with neutral detergent in lukewarm water at 40 ° C, washing and drying for 15 minutes, repeating 5 times in total, and airing for 20 seconds in air.

division
Fill Power Repetitive compression recovery (%) Repetitive compression recovery
Decrease (%)
Before washing After washing Before washing (p) After washing (q) Example 1 294 280 98.0 94.9 3.2 Example 2 326 310 98.2 94.1 4.2 Example 3 375 356 98.7 94.9 3.8 Example 4 370 352 99.2 95.7 3.5 Comparative Example 1 262 241 97.2 90.2 7.2 Comparative Example 2 320 290 96.9 90.8 6.3 Comparative Example 3 330 305 98.5 91.8 6.8 Comparative Example 4 275 225 97.9 90.4 7.7

Repeat compression recovery reduction rate (%) = (p-q) / p * 100

The percentage of repeated compression recovery (%) before washing was 97 to 99% in all of the examples and comparative examples, and there was no significant difference. However, the reduction rate after washing was in the range of 3.0 to 5.0% To 8.0%, it can be seen that,

 It can be seen that the embodiment has excellent crimp ratio due to the characteristics of the bicomponent hollow composite yarn, excellent in shape stability against external force, and excellent recovery rate even after repeated washing and compression recovery.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

100: Binary hollow composite yarn
110: polyethylene terephthalate polymer
120: polytrimethylene terephthalate polymer
130: hollow (empty space)
140, 140: first spinneret 141: first spinneret top
143: first spinneret bottom 150, 150: second spinneret
151: second spinneret top 153: second spinneret bottom

Claims (6)

A polytrimethylene terephthalate polymer or a polybutylene terephthalate polymer is formed in a polyethylene terephthalate polymer as a side by side type,
The side by side type is a hollow composite yarn having an annular cross section and a circular hollow portion formed at a center of the cross section by 5 to 30%
The polyester-based ball fiber having a repeated compression recovery ratio of 3.0 to 5.0% at a rate of repeated compression recovery before and after washing using the hollow composite yarn.
The method according to claim 1,
The polyethylene terephthalate polymer has an intrinsic viscosity of 0.45 to 0.65 dl / g, a polytrimethylene terephthalate polymer has an intrinsic viscosity of 0.9 to 1.1 dl / g, polybutylene terephthalate Terephthalate) having an intrinsic viscosity of 0.8 to 1.2 dl / g.
The method according to claim 1,
Characterized in that the weight ratio of polytrimethylene terephthalate polymer or polybutylene terephthalate polymer to the polyethylene terephthalate polymer is 4 to 6 to 6 to 4, Excellent polyester-based ball fiber.
The method according to claim 1,
Wherein the polyester-based staple fiber has a monofilament fineness of 1.5 to 15 denier and a fiber length of 10 to 100 mm.
The method according to claim 1,
Wherein the polyester-based ball fibers are excellent in shape stability and are not easily agglomerated before and after washing.
An article of clothing using a polyester-based ball fiber excellent in repeated compression recovery ratio according to any one of claims 1 to 5 as a filler.

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