TW202212656A - Fabric for warm cloth - Google Patents

Abstract

A fabric for warm cloth includes a hollow side-by-side type fiber. The hollow side-by-side type fiber includes 40 parts by weight to 60 parts by weight of a first polyester and 40 parts by weight to 60 parts by weight of a second polyester, in which a difference in intrinsic viscosity between the first polyester and the second polyester is between 0.15 dL/g and 0.25 dL/g.

Description

fabrics for thermal fabrics

The present disclosure relates to a fabric, and more particularly, to a fabric woven from hollow side-by-side fibers for use in thermal fabrics.

In recent years, the global greenhouse effect has caused extreme climate change, and the extremely cold and extremely hot climate has also changed the style of clothing, making traditional clothing introduce technology to strengthen the function of keeping warm. Generally speaking, hollow fibers are often used in many cold clothing due to their advantages of small specific gravity and good thermal insulation properties. However, in order to ensure that the hollow fiber has a high fiber crimp rate to improve the bulkiness of the clothes made of it, a common practice at present is to use false twisting, which often leads to a decrease in the fiber hollowness of the hollow fiber. As a result, it cannot maintain or improve its thermal insulation. Therefore, how to prepare hollow fibers with high fiber crimp rate and high fiber hollow rate at the same time is still an important topic of active research by textile industry.

The present disclosure provides a fabric for a thermal fabric, which is woven from hollow side-by-side fibers that can be crimped spontaneously, so as to provide a good thermal effect of the thermal fabric.

According to some embodiments of the present disclosure, the fabric for thermal fabrics of the present disclosure includes hollow side-by-side fibers. The hollow side-by-side fiber comprises 40 to 60 parts by weight of a first polyester and 40 to 60 parts by weight of a second polyester, wherein the difference between the intrinsic viscosity of the first polyester and the intrinsic viscosity of the second polyester Between 0.15 dL/g and 0.25 dL/g.

In some embodiments of the present disclosure, the intrinsic viscosity of the first polyester is between 0.60 dL/g and 0.70 dL/g.

In some embodiments of the present disclosure, the intrinsic viscosity of the second polyester is between 0.80 dL/g and 0.90 dL/g.

In some embodiments of the present disclosure, the difference between the melting point of the first polyester and the melting point of the second polyester is between 10°C and 20°C.

In some embodiments of the present disclosure, the melting point of the first polyester is between 255°C and 265°C.

In some embodiments of the present disclosure, the melting point of the second polyester is between 235°C and 245°C.

In some embodiments of the present disclosure, the insulation value of the fabric used for the thermal fabric is between 31.0 clo/g and 36.5 clo/g.

In some embodiments of the present disclosure, the hollow side-by-side fiber has a fiber hollow content ranging from 22.0% to 25.5%.

In some embodiments of the present disclosure, the fiber gauge of the hollow side-by-side fiber is between 2.5 dpf and 3.5 dpf.

In some embodiments of the present disclosure, the fiber strength of the hollow side-by-side fibers is between 2.7 gf/d and 3.2 gf/d.

According to the above embodiments of the present disclosure, since the hollow side-by-side fibers include the first polyester and the second polyester, and the first polyester and the second polyester have similar but different intrinsic viscosities, the hollow side-by-side fibers can be well Shaped and has high fiber hollowness. On the other hand, since the first polyester and the second polyester have different thermal shrinkage properties, the hollow side-by-side fibers can be crimped spontaneously after being cooled and solidified during the spinning process. In this way, the false twisting step of the fibers can be omitted to increase the fiber hollowness of the hollow side-by-side fibers, thereby improving the bulkiness of the fabrics woven from them, so as to provide good lightness and warmth retention.

Several embodiments of the present disclosure will be disclosed in the following drawings, and for the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the present disclosure. That is to say, in some embodiments of the present disclosure, these practical details are unnecessary, and therefore should not be used to limit the present disclosure. In addition, for the purpose of simplifying the drawings, some well-known structures and elements will be shown in a simple and schematic manner in the drawings. In addition, for the convenience of the reader, the size of each element in the drawings is not drawn according to the actual scale.

The present disclosure provides a fabric for thermal fabric comprising bicomponent hollow side-by-side fibers. Since the components in the hollow side-by-side fiber have similar but different intrinsic viscosities, the hollow side-by-side fiber can be well formed and has a high fiber hollow ratio. On the other hand, since each component in the hollow side-by-side fiber has different thermal shrinkage properties, it can crimp spontaneously during cooling and solidification in the spinning process. In this way, the false twisting step of the fibers can be omitted to increase the fiber hollowness of the hollow side-by-side fibers, thereby improving the bulkiness of the fabrics woven from them, so as to provide good lightness and warmth retention effect, so it is suitable for in the field of thermal fabrics.

FIG. 1 is a three-dimensional schematic diagram of a fabric for thermal insulation fabric (hereinafter also referred to as fabric) 10 according to some embodiments of the present disclosure. FIG. 2A is a partially enlarged schematic view of the cloth 10 of FIG. 1 . Fig. 2B is a schematic cross-sectional view of the hollow side-by-side fibers 100 in the cloth 10 of Fig. 2A. Please refer to FIGS. 1 to 2B at the same time, the fabric 10 of the present disclosure is woven from hollow side-by-side fibers 100 , for example, by knitting, weaving, or a combination thereof, wherein the hollow side-by-side fibers 100 refer to having a hollow structure of bicomponent side-by-side fibers. In detail, the hollow side-by-side fiber 100 includes a first polyester 110 and a second polyester 120, and the first polyester 110 and the second polyester 120 are combined with each other to jointly surround a hollow cavity 130, wherein the hollow cavity 130 It is located approximately in the center of the hollow side-by-side fibers 100 and penetrates the hollow side-by-side fibers 100 along the extending direction of the hollow side-by-side fibers 100 . Specifically, when viewed from the cross-section of the hollow side-by-side fiber 100 (ie, the viewing angle of FIG. 2B ), the first polyester 110 and the second polyester 120 are connected to each other at their two ends to form a circle (or A hollow cavity 130 with an oval) cross-section. In the hollow side-by-side fiber 100 of the present disclosure, the difference between the intrinsic viscosity of the first polyester 110 and the intrinsic viscosity of the second polyester 120 is between 0.15 dL/g and 0.25 dL/g, so that the hollow side-by-side fiber 100 is well formed and has a high fiber hollow content, as will be described in more detail below.

The hollow side-by-side fiber 100 includes 40 to 60 parts by weight of the first polyester 110 . In some embodiments, the first polyester 110 may be, for example, polyethylene terephthalate (PET) or polybutylene terephthalate (PBT). In some embodiments, the intrinsic viscosity of the first polyester 110, measured according to the ASTM D4603 standard method in a mixed solution of phenol and 1,1,2,2 tetrachloroethane, may be between 0.60 dL/g and 0.70 dL/g. The first polyester 110 with the above-mentioned intrinsic viscosity can have suitable fluidity, so as to meet the processing conditions of the spinning process. In detail, if the intrinsic viscosity of the first polyester 110 is less than 0.60 dL/g, the fluidity of the first polyester 110 may be too large, making it difficult for the fibers to be formed into a hollow state; if the intrinsic viscosity of the first polyester 110 If it is greater than 0.70 dL/g, the fluidity of the first polyester 110 may be too small and too viscous, resulting in poor fiber filamentation and unable to spin.

The hollow side-by-side fiber 100 includes 40 to 60 parts by weight of the second polyester 120 . In some embodiments, the second polyester 120 may be, for example, polyethylene terephthalate (PET) or polybutylene terephthalate (PBT). In some embodiments, the material of the first polyester 110 may be the same as the material of the second polyester 120 (eg, both are polyethylene terephthalate or both are polybutylene terephthalate), so as to It is beneficial to the recycling and reuse of the hollow side-by-side fibers 100 , thereby improving the environmental protection of the hollow side-by-side fibers 100 . In some embodiments, the intrinsic viscosity of the second polyester 120, measured according to the ASTM D4603 standard method in a mixed solution of phenol and 1,1,2,2 tetrachloroethane, may be between 0.80 dL/g and 0.90 dL/g. The second polyester 120 with the above-mentioned intrinsic viscosity can have suitable fluidity, so as to meet the processing conditions of the spinning process. In detail, if the intrinsic viscosity of the second polyester 120 is less than 0.80 dL/g, the fluidity of the second polyester 120 may be too large, making it difficult for the fibers to be formed into a hollow state; if the intrinsic viscosity of the second polyester 120 If it is greater than 0.90 dL/g, the fluidity of the second polyester 120 may be too small and too viscous, resulting in poor fiber filamentation and unable to spin.

It should be noted that, since the difference between the intrinsic viscosity of the first polyester 110 and the intrinsic viscosity of the second polyester 120 of the present disclosure is between 0.15 dL/g and 0.25 dL/g, the first polyester 110 can be Similar but different flow properties to the second polyester 120 . In this way, the first polyester 110 and the second polyester can be spun out from the spinning nozzle at substantially the same speed, and assembled into filaments at substantially the same speed, so that the hollow side-by-side fiber 100 is well formed and has high performance. The hollow ratio of the fibers is high, so as to provide a good thermal insulation effect of the fabric 10 woven by it. It should be understood that the “fiber hollow ratio” herein refers to the cross-sectional area A1 of the hollow cavity 130 from the viewing angle of FIG. 2B to the cross-sectional area A2 of the hollow side-by-side fiber 100 from the viewing angle of FIG. 2B (wherein the cross-sectional area A2 includes The ratio of the area A1). In some embodiments, the hollow side-by-side fiber 100 may have a fiber hollow content between 22.0% and 25.5%, thereby providing good thermal insulation and maintaining its structural stiffness. In more detail, if the fiber hollowness of the hollow side-by-side fibers 100 is less than 22.0%, the fabric 10 woven with the hollow side-by-side fibers 100 may not have a good thermal insulation effect; 25.5%, which may make the hollow cavities 130 of the hollow side-by-side fibers 100 account for too much, resulting in the structure of the hollow side-by-side fibers 100 being fragile and prone to collapse.

In some embodiments, the melting point of the first polyester 110 may be between 255°C and 265°C, and the melting point of the second polyester 120 may be between 235°C and 245°C. The respective melting points of the first polyester 110 and the second polyester 120 can enable the first polyester 110 and the second polyester 120 to have suitable intrinsic viscosity during the spinning process to have suitable fluidity. In detail, if the melting points of the first polyester 110 and the second polyester 120 are lower than 255° C. and 235° C., respectively, the fluidity of the first polyester 110 and the second polyester 120 may be too large, making it difficult for the fibers to be formed into Hollow state; if the melting points of the first polyester 110 and the second polyester 120 are higher than 265°C and 245°C, respectively, the fluidity of the first polyester 110 and the second polyester 120 may be too small and too viscous, resulting in The fibers have poor filamentation properties and cannot be spun. In some embodiments, the difference between the melting point of the first polyester 110 and the melting point of the second polyester 120 may be between 10°C and 20°C, so that the first polyester 110 and the second polyester 120 may have similar Viscosity and fluidity. In this way, the first polyester 110 and the second polyester 120 can be spun out from the spinning nozzle at substantially the same speed, and assembled into filaments at substantially the same speed, so that the hollow side-by-side fiber 100 is well formed and has High fiber hollow ratio to provide good thermal insulation effect of the fabric 10 woven by it.

It should be noted that the first polyester 110 and the second polyester 120 of the present disclosure not only have similar but different intrinsic viscosities and melting points, but also have different thermal shrinkage properties, so that the hollow side-by-side fibers 100 can be used in the spinning process. can curl spontaneously during cooling and solidification. In this way, the false twisting step of the fibers can be omitted to prevent the hollow cavity 130 from collapsing, so that the shape of the hollow cavity 130 can be well maintained and the fiber hollowness of the hollow side-by-side fiber 100 can be improved. The bulkiness of the fabric 10 provides good lightness and warmth retention, which will be described in more detail below.

FIG. 3A is a schematic diagram illustrating a spinning process of the hollow side-by-side fiber 100 according to some embodiments of the present disclosure. FIG. 3B is a partially enlarged schematic view of the region R of FIG. 3A . Please also refer to Figure 3A and Figure 3B. In some embodiments, the first polyester material 110' and the second polyester material 120' may be delivered to the first extruder 32 and the second extruder from the first feed port 22 and the second feed port 24, respectively In the press 34, the high temperature and high pressure provided by the first extruder 32 and the second extruder 34 are respectively converted into a molten state. Then, the first polyester material 110' and the second polyester material 120' in the molten state pass through the first branch channel 42 and the second branch channel 44 respectively to reach the spinning box 50 with the spinning nozzle 55, and pass through the first branch channel 42 and the second branch channel 44 respectively. The high pressure provided by the first pump 62 and the second pump 64 and the high temperature provided by the spinning box 50 are ejected from the nozzle opening 58 of the spinning nozzle 55 and fiberized, thereby assembling to form streamlined hollow side-by-side fibers. Next, the streamlined hollow side-by-side fibers are cooled and solidified to spontaneously crimp. The present disclosure has a helical-like hollow side-by-side fiber 100 . In some embodiments, the temperature provided by the spin box 50 may be between 290° C. and 300° C. to ensure that the first polyester material 110 ′ and the second polyester material 120 ′ are maintained in the spin box 50 in molten state. In some embodiments, the spinning speed of the spinning process may be, for example, between 2500 meters/minute and 4500 meters/minute.

In some embodiments, when the first polyester material 110' and the second polyester material 120' are ejected from the spinning nozzle 55 and fiberized (for example, at the position R1 in FIG. 3A), the first polyester material 110' and the second polyester material 120' The streamlined hollow side-by-side fibers formed by the polyester 110 and the second polyester 120 have not been completely cooled and solidified. More specifically, please refer to FIG. 4A and FIG. 4B at the same time, wherein FIG. 4A shows a three-dimensional schematic view of the hollow side-by-side fiber 100 before being cooled and solidified during the spinning process according to some embodiments of the present disclosure (the hollow side-by-side type fiber). The fiber 100 is a streamlined hollow side-by-side fiber before being cooled and solidified), and FIG. 4B is a schematic cross-sectional view of the streamlined hollow side-by-side fiber of FIG. 4A . As shown in Fig. 4A and Fig. 4B, when the first polyester 110 and the second polyester 120 are ejected from the spinning nozzle 55 (see Fig. 3A) and fiberized, the streamlined hollow side-by-side fibers formed are It is in an uncrimped state, and a plurality of streamlined hollow side-by-side fibers are arranged closely and parallel to each other, that is, there is no obvious gap between the multiple streamlined hollow and side-by-side fibers. In some embodiments, the streamlined hollow side-by-side fibers can have a pronounced hollow cavity 130, ie, have a high fiber hollow ratio.

In some embodiments, after the streamlined hollow side-by-side fibers are cooled and solidified (eg, at position R2 in Figure 3A), the streamlined hollow side-by-side fibers can spontaneously crimp to have a helical-like shape Hollow side-by-side fiber 100 . More specifically, please refer to FIG. 5A and FIG. 5B at the same time, wherein FIG. 5A shows a three-dimensional schematic diagram of the hollow side-by-side fiber 100 after being cooled and solidified during the spinning process according to some embodiments of the present disclosure, and FIG. 5B FIG. 5A is a schematic cross-sectional view of the hollow side-by-side fiber 100 shown in FIG. 5A . As shown in FIGS. 5A and 5B, since the first polyester 110 and the second polyester 120 in the hollow side-by-side fiber 100 have different thermal shrinkage properties, the first polyester 110 and the second polyester 120 are There may be different degrees of shrinkage during cooling and solidification, such that the streamlined hollow side-by-side fibers of Figure 4A can spontaneously crimp to form the helical-like hollow side-by-side fibers 100 of Figure 5A. After the spiral-like hollow side-by-side fibers 100 are formed, there are obvious gaps between the plurality of hollow side-by-side fibers 100 to enhance the fluffy feeling of the fabric woven by them, thereby providing good lightness and warmth retention effect. In some embodiments, the fiber crimp of the hollow side-by-side fibers 100 may be between 5.5% and 16.0%. On the other hand, since the hollow side-by-side fiber 100 can be crimped spontaneously, the false twisting step of the fiber can be omitted to avoid the collapse of the hollow cavity 130, thereby maintaining the shape of the hollow side-by-side fiber 130 well and lifting the hollow side-by-side fiber 100 high fiber hollowness to provide good thermal insulation for the fabrics it is woven into. As shown in FIG. 4B and FIG. 5B , the streamlined hollow side-by-side fiber before crimping and the helical-like hollow side-by-side fiber 100 after crimping both have obvious hollow cavities 130 , and the fiber hollow ratio of both is roughly the same.

In some embodiments, the cooling and solidification of the streamlined hollow side-by-side fibers may be accompanied by post-processing steps such as co-extension processing and fiber take-up in the spinning process. In detail, the streamlined hollow side-by-side fibers can be passed through a plurality of rollers 70 and drums 80 as shown in FIG. 3A for forward stretching and fiber winding, and during this process, the streamlined hollow side-by-side fibers Spontaneous crimping can continue to form the hollow side-by-side fibers 100 of the present disclosure. In some embodiments, the down-draw processed hollow side-by-side fibers 100 can have a fiber tenacity of between 2.7 gf/d and 3.2 gf/d and a fiber elongation of between 12.5% and 40.5%, such that the hollow The side-by-side fibers 100 can have good toughness and elasticity at the same time, so as to provide users with wearing comfort. In some embodiments, the hollow side-by-side fibers 100 may be suitably down-stretched to have a fiber gauge between 2.5 dpf and 3.5 dpf.

In the following description, the fibers of various examples and comparative examples of the present disclosure will be listed to conduct various analyses to verify the efficacy of the present disclosure. The detailed description of the fibers of each Example and each Comparative Example is shown in Table 1.

Table I fiber pattern First polyester (50wt%) Second polyester (50wt%) Forward extension ratio (%) Example 1 Two-component hollow side-by-side type PET 1 (IV=065) PET 2 (IV=085) 1.6 Example 2 Two-component hollow side-by-side type PET 1 (IV=065) PET 2 (IV=085) 1.5 Example 3 Two-component hollow side-by-side type PET 1 (IV=065) PET 2 (IV=085) 1.4 Example 4 Two-component hollow side-by-side type PET 1 (IV=065) PET 2 (IV=085) 1.3 Example 5 Two-component hollow side-by-side type PET 1 (IV=065) PET 2 (IV=085) 1.2 fiber pattern Material Forward extension ratio (%) Comparative Example 1 One-component solid type PET 1 (IV=065) 1.6 Comparative Example 2 One-component hollow type PET 1 (IV=065) 1.6 Comparative Example 3 One-component hollow type (false twist) PET 1 (IV=065) 1.6

In the following experimental examples, the fibers of each example and each comparative example are tested for fiber strength, fiber elongation, and fiber hollow ratio, and the fabrics woven from the fibers of each example and each comparative example are unitized. Cloth weight insulation value test. The test results are shown in Table 2.

Table II Fiber strength (gf/d) Fiber stretch (%) Fiber hollow rate (%) Insulation value per unit cloth weight (clo/g) Example 1 2.71 12.7 25.1 31.5 Example 2 3.07 18.9 24.6 34.0 Example 3 3.16 22.7 22.3 32.6 Example 4 3.19 31.5 24.8 36.3 Example 5 2.94 40.3 23.5 36.2 Comparative Example 1 3.56 33.0 0 19.4 Comparative Example 2 3.26 28.5 15.3 27.2 Comparative Example 3 3.15 32.8 6.3 25.0

It can be seen from Table 2 that the hollow side-by-side fibers of each embodiment have higher fiber hollowness ratios than those of each comparative example, thereby providing better portability and thermal insulation effect. It is worth noting that although the fiber of Comparative Example 3 also has a hollow structure, because it is a one-component structure, it cannot achieve spontaneous crimping through the aforementioned difference in thermal shrinkage, so a false twisting step is required to make the fiber. The fibers were crimped, and the fibers of Comparative Example 3 had a lower fiber hollow ratio because the false twisting step easily resulted in the collapse of the hollow cavities of the hollow fibers. On the other hand, compared with the fabrics woven with the fibers of the comparative examples, the fabrics woven with the hollow side-by-side fibers of the examples have higher heat preservation values per unit cloth weight. Specifically, the fabrics woven with the hollow side-by-side fibers of each embodiment, measured according to the ASTM D1518 standard method, have a heat preservation value per unit cloth weight ranging from 31.0 clo/g to 36.5 clo/g. It can be seen that under the same cloth weight, the cloth woven with the hollow side-by-side fibers of each embodiment has a better thermal insulation effect, so it is suitable for the field of thermal insulation fabrics.

According to the above-mentioned embodiments of the present disclosure, the fabric used for the thermal insulation fabric of the present disclosure is woven from two-component hollow side-by-side fibers, and each component in the hollow side-by-side fibers has similar but different intrinsic viscosities and melting points , so it can be formed well and has a high fiber hollow ratio. On the other hand, since each component in the hollow side-by-side fiber has different thermal shrinkage properties, it can crimp spontaneously during cooling and solidification in the spinning process. In this way, the false twisting step of the fibers can be omitted, thereby increasing the fiber hollowness of the hollow side-by-side fibers, and thereby improving the bulkiness of the fabrics woven from them, so as to provide good lightness and warmth retention effect, thereby Applicable to the field of thermal fabrics.

Although the present disclosure has been disclosed as above in embodiments, it is not intended to limit the present disclosure. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure protects The scope shall be determined by the scope of the appended patent application.

10: Fabric 22: The first feeding port 24: The second feed port 32: First Extruder 34: Second Extruder 42: First shunt channel 44: Second shunt channel 50: Spinning box 55: Spinning nozzle 58: Spinning mouth 62: First pump 64: Second pump 70: Roller 80: Roller 100: Hollow side-by-side fiber 110: First polyester 110': First polyester material 120: Second polyester 120': Second polyester material 130: hollow cavity R: area R1, R2: position A1, A2: Sectional area

In order to make the above and other objects, features, advantages and embodiments of the present disclosure more clearly understood, the accompanying drawings are described as follows: FIG. 1 is a three-dimensional schematic diagram of a fabric for thermal insulation fabrics according to some embodiments of the present disclosure; Figure 2A shows a partial enlarged schematic view of the fabric of Figure 1; Fig. 2B is a schematic cross-sectional view of the hollow side-by-side fibers in the fabric of Fig. 2A; 3A is a schematic diagram illustrating a spinning process of hollow side-by-side fibers according to some embodiments of the present disclosure; FIG. 3B is a partially enlarged schematic diagram of the region R of FIG. 3A; FIG. 4A is a schematic perspective view of the hollow side-by-side fiber according to some embodiments of the present disclosure before being cooled and solidified during the spinning process; FIG. 4B is a schematic cross-sectional view of the streamlined hollow side-by-side fiber of FIG. 4A; 5A is a schematic three-dimensional view of the hollow side-by-side fiber after cooling and solidification during the spinning process according to some embodiments of the present disclosure; and Fig. 5B is a schematic cross-sectional view of the hollow side-by-side fiber of Fig. 5A.

Domestic storage information (please note in the order of storage institution, date and number) none Foreign deposit information (please note in the order of deposit country, institution, date and number) none

100: Hollow side-by-side fiber

110: First polyester

120: Second polyester

130: hollow cavity

A1, A2: Sectional area

Claims (10)

A fabric for thermal fabrics comprising: Hollow side-by-side fibers, including: 40 to 60 parts by weight of the first polyester; and 40 to 60 parts by weight of the second polyester, wherein the difference between the intrinsic viscosity of the first polyester and the intrinsic viscosity of the second polyester is between 0.15 dL/g and 0.25 dL/g. The cloth for thermal insulation fabrics according to claim 1, wherein the intrinsic viscosity of the first polyester is between 0.60 dL/g and 0.70 dL/g. The cloth for thermal insulation fabrics according to claim 1, wherein the intrinsic viscosity of the second polyester is between 0.80 dL/g and 0.90 dL/g. The cloth for thermal insulation fabric according to claim 1, wherein the difference between the melting point of the first polyester and the melting point of the second polyester is between 10°C and 20°C. The cloth for thermal insulation fabric according to claim 1, wherein the melting point of the first polyester is between 255°C and 265°C. The cloth for thermal insulation fabric according to claim 1, wherein the melting point of the second polyester is between 235°C and 245°C. The fabric for thermal insulation fabrics according to claim 1, wherein the thermal insulation value of the fabric for thermal insulation fabrics is between 31.0 clo/g and 36.5 clo/g. The cloth for thermal insulation fabrics according to claim 1, wherein the hollow side-by-side fibers have a fiber hollow ratio of 22.0% to 25.5%. The cloth for thermal insulation fabrics according to claim 1, wherein the fiber specification of the hollow side-by-side fibers is between 2.5 dpf and 3.5 dpf. The cloth for thermal insulation fabrics according to claim 1, wherein the fiber strength of the hollow side-by-side fibers is between 2.7 gf/d and 3.2 gf/d.

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