JP2023175500A - Thread, fabric and clothing - Google Patents

Abstract

To provide a thread capable of effectively generating a surface potential of fabric and clothing having a low elongation, a fabric and clothing.SOLUTION: A thread has a large diameter with a total fineness of 90 dtex or more and includes an electric potential generation filament 10 for generating an electric potential with energy received from the outside.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD This disclosure relates to yarns, fabrics and garments.

Patent Document 1 discloses a yarn including fibers that generate a surface potential due to external energy. Further, Patent Document 1 states that the thickness of the thread is 0.005 to 10 dtex (see claim 3 of Patent Document 1), and Patent Document 2 states that the elongation of the cloth is 10% (Patent Document 2). (See claim 1 of Document 2) is disclosed.

According to the thread described in Patent Document 1, by generating a potential defined under predetermined conditions, it is possible to exert desired effects such as antibacterial, charging, or adsorption (Patent Document 1) (See paragraph [0008]).

International Publication No. 2020/241432 Japanese Patent Application Publication No. 2022-056409

In recent years, clothing that is loose and comfortable to wear (outer clothing such as outerwear) has become popular, and since the clothing itself is loose, the elongation required by the clothing is low. The cloth described in Patent Document 2 has an elongation of 10%, and since it is a cloth containing threads containing potential generating filaments, it is possible to generate an electric potential according to the elongation. However, in cases where the elongation of loose-fitting clothing is less than 10%, in order to effectively generate surface potential, it is necessary to deal with it in a new direction rather than as an extension of conventional technology. It was necessary.

Therefore, an object of the present disclosure is to provide yarn, cloth, and clothing that can effectively generate a surface potential for clothing with low elongation.

The inventor of the present application has proposed that a "thread containing a potential-generating filament" generates an electric potential when it receives external energy (e.g., tension, stress, etc.) and forms an electric field. We focused on the fact that such things were played.

Therefore, the yarn of the present disclosure has a large diameter with a total fineness of 90 dtex or more, and includes a potential generating filament that generates a potential by receiving energy from the outside.

The fabric of the present disclosure includes the above yarn.

The clothing of the present disclosure includes the above cloth.

According to the present disclosure, it is possible to effectively generate a surface potential on a yarn having low elongation. Note that the effects described in this specification are merely examples and are not limited, and there may be additional effects.

FIG. 1(A) is a diagram showing the structure of the thread 1s (S thread), FIG. 1(B) is a cross-sectional view taken along the line AA in FIG. 1(A), and FIG. , is a cross-sectional view taken along line BB in FIG. 1(A). FIGS. 2(A) and 2(B) are diagrams showing the relationship between the uniaxial stretching direction of polylactic acid, the potential direction, and the deformation of the potential generating filament 10. FIG. 3(A) is a diagram showing the configuration of the yarn 1z (Z yarn), FIG. 3(B) is a cross-sectional view taken along the line AA in FIG. 3(A), and FIG. 3(C) is a diagram showing the configuration of the yarn 1z (Z yarn). , is a cross-sectional view taken along line BB in FIG. 3(A). FIG. 4 is a cross-sectional view schematically showing a cross section of a thread including a dielectric material 100 around a potential generating filament 10. FIG. 5 is a schematic diagram of a false twisted yarn manufacturing apparatus. FIG. 6(a) is a schematic diagram of the yarn in a twisted state, FIG. 6(b) is a schematic diagram of the yarn before the interlacing process by an air jet device, and FIG. 6(c) is a schematic diagram of the yarn after the entangling process. FIG.

The yarn, fabric, and garment of the present disclosure will be described below. Although explanations will be made with reference to drawings as necessary, the contents shown in the drawings are merely shown schematically and exemplarily for understanding the present disclosure, and the appearance, dimensional ratio, etc. may differ from the actual thing. Note that the various numerical ranges mentioned in this specification are intended to include the lower limit and/or upper limit value themselves, unless otherwise specified. In other words, if we take a numerical range from 1 to 10 as an example, it can be interpreted as including the lower limit of "1" and also the upper limit of "10". In addition, although "about" or "degree" may be attached to various numerical values, the terms "about" and "degree" mean several percentages, such as ±10%, ±5%, ±3%, This means that variations of ±2 percent and ±1 percent may be included.

-Description of the thread of the present disclosure-
The yarn of the present disclosure will be explained. The thread has a "large diameter with a total fineness of 90 dtex or more" and includes "potential generating filaments 10" (or fibers capable of forming an electric field due to surface charges). There is no particular restriction on the number of potential generating filaments 10, and for example, only one, two or more, 2 to 1000 potential generating filaments, preferably 10 to 800 potential generating filaments 10, and more preferably about 20 to 600 potential generating filaments according to the present disclosure. May be included in yarn.

[About potential generating filament]
First, the potential generating filaments that constitute the yarn of the present disclosure will be explained. In the present disclosure, a "potential generating filament" basically means, as described above, "a filament that generates a potential (specifically, a surface (hereinafter referred to as "potential generating fiber", "electric field forming filament", "electric field forming fiber", "charge generating fiber" or "charge generating fiber"). (sometimes called "filament"). As the potential generating filament, for example, the charge generating fiber described in Japanese Patent No. 6428979 may be used.

"External energy" includes, for example, an external force (hereinafter sometimes referred to as "external force"), specifically a force that causes deformation or distortion in a thread or a potential-generating filament and/or a thread. or a force applied in the axial direction of the potential-generating filament, more specifically a tension force (e.g. a tensile force in the axial direction of the thread or the potential-generating filament) and/or a stress or strain force (a tensile stress or strain applied to the thread or the potential-generating filament) external forces such as tensile strain) and/or forces applied in the transverse direction of the yarn or potential-generating filament.

The potential generating filament is, for example, a material that has a piezoelectric effect (polarization phenomenon caused by external force) or piezoelectricity (the property of generating voltage when mechanical strain is applied, or conversely, generating mechanical strain when voltage is applied). (hereinafter sometimes referred to as a "piezoelectric material" or "piezoelectric body"). Among these, it is particularly preferable to use fibers containing a piezoelectric material (hereinafter sometimes referred to as "piezoelectric fibers"). Piezoelectric fibers can generate a potential using piezoelectricity, so they do not require a power source and there is no risk of electric shock. Note that the life of the piezoelectric material contained in the piezoelectric fiber lasts longer than, for example, the antibacterial effect of a drug or the like. Such piezoelectric fibers are also less likely to cause allergic reactions.

The "piezoelectric material" can be used without particular limitation as long as it has a piezoelectric effect or piezoelectricity, and may be an inorganic material such as piezoelectric ceramics or an organic material such as a polymer.

Preferably, the "piezoelectric material" (or "piezoelectric fiber") comprises a "piezoelectric polymer." Examples of the "piezoelectric polymer" include "piezoelectric polymer having pyroelectricity" and "piezoelectric polymer not having pyroelectricity."

"Piezoelectric polymer with pyroelectricity" generally refers to a piezoelectric material made of a polymer material that has pyroelectricity and can generate an electric charge (or electric potential) on its surface simply by applying a temperature change. means. Examples of such piezoelectric polymers include polyvinylidene fluoride (PVDF). Particularly preferred is one that can generate electric charge (or potential) on its surface using the thermal energy of the human body.

"Piezoelectric polymer without pyroelectricity" means a piezoelectric polymer that is generally made of a polymeric material and excludes the above-mentioned "piezoelectric polymer with pyroelectricity." Examples of such piezoelectric polymers include polylactic acid (PLA). Known examples of polylactic acid include poly-L-lactic acid (PLLA), which is obtained by polymerizing L-form monomers, and poly-D-lactic acid (PDLA), which is obtained by polymerizing D-form monomers.

An example of a piezoelectric material included in the potential generating filament is "polylactic acid." Polylactic acid (PLA), which can be used as a piezoelectric material, is a chiral polymer and has a main chain with a helical structure. When polylactic acid is uniaxially stretched to orient its molecules, it can exhibit piezoelectricity. If heat treatment is further applied to increase the degree of crystallinity, the piezoelectric constant will increase. By increasing the degree of crystallinity in this way, the value of surface potential can be improved.

The optical purity (enantiomeric excess (ee)) of polylactic acid (PLA) can be calculated using the following formula.
Optical purity (%) = {| L amount − D amount | / (L amount + D amount)} × 100
For example, in both the D-form and the L-form, the optical purity is 90% by weight or more, preferably 95% by weight or more, more preferably 98% by weight or more and 100% by weight or less, even more preferably 99.0% by weight or more. It is 100% by weight or less, particularly preferably 99.0% by weight or more and 99.8% by weight or less. For the L content and D content of polylactic acid (PLA), values obtained by, for example, a method using high performance liquid chromatography (HPLC) can be used.

The number average molecular weight (Mn) of polylactic acid is, for example, 6.2×10 ⁴ , and the weight average molecular weight (Mw) is, for example, 1.5×10 ⁵ . Note that the molecular weight is not limited to these values.

Since polylactic acid can become piezoelectric due to molecular orientation treatment by stretching, it is not necessary to perform a poling treatment unlike other piezoelectric polymers such as polyvinylidene fluoride (PVDF) or piezoelectric ceramics. The piezoelectric constant of uniaxially stretched polylactic acid is about 5 to 30 pC/N, which is a very high piezoelectric constant among polymers. Furthermore, the piezoelectric constant of polylactic acid does not change over time and is extremely stable.

The potential generating filament is preferably a fiber having a circular cross section. The potential generating filament can be produced by, for example, a method in which a piezoelectric polymer is extruded and made into fibers, a method in which a piezoelectric polymer is melt-spun and made into fibers (for example, a spinning/drawing method in which the spinning process and the drawing process are performed separately, Dry or wet spinning of piezoelectric polymers (including the direct stretching method that connects the spinning process and the stretching process, the POY-DTY method that can perform the false twisting process at the same time, and the ultra-high speed spinning method that aims to increase the speed) (For example, a phase separation method or wet/dry spinning method in which a raw material polymer is dissolved in a solvent and then extruded through a nozzle to form fibers, a gel spinning method in which fibers are uniformly formed into a gel while containing a solvent, or It can be produced by a method in which a piezoelectric polymer is made into fibers by electrospinning (including a liquid crystal spinning method that uses a liquid crystal solution or melt), or a method in which a piezoelectric polymer is made into fibers by electrostatic spinning. Note that the cross-sectional shape of the potential generating filament is not limited to a circular shape. For example, it may have a circular, oval, rectangular, or irregularly shaped cross section.

The potential generating filament may be a long fiber or a short fiber. The potential generating filament may have a length (dimension) of, for example, 0.01 mm or more. The length may be selected as appropriate depending on the desired use.

[About the yarn of the first embodiment (so-called S yarn embodiment)]
The yarn of the present disclosure may be a yarn in which a plurality of potential generating filaments are simply aligned (aligned yarn or non-twisted yarn), or may be a twisted yarn (twisted yarn or twisted yarn), It may be a crimped yarn (crimped yarn or false twisted yarn) or a spun yarn (spun yarn). Alternatively, the potential generating filament may have a configuration in which a conductor is used as a core thread, an insulator is wrapped around the conductor (covering), and a voltage is applied to the conductor to generate electric charges.

As shown in FIG. 1(A), the thread 1s may be constructed by twisting a plurality of potential generating filaments 10 together. In the embodiment shown in FIG. 1A, the yarn 1s is a left-handed yarn (hereinafter referred to as "S yarn") twisted by twisting the potential-generating filament 10 to the left; The yarn may be a right-handed yarn (hereinafter referred to as a "Z yarn") twisted in a right-handed manner (see, for example, yarn 1z in FIG. 3(A)). In this way, when the yarn is a twisted yarn, it may be either an "S yarn" or a "Z yarn."

In the yarn, the potential generating filaments 10 are spaced apart from about 0 μm to about 10 μm, typically about 5 μm. Note that when the interval between the potential generating filaments 10 is 0 μm, it means that the potential generating filaments are in contact with each other.

The yarn has a "large diameter with a total fineness of 90 dtex or more." The term "total fineness" as used herein refers to the total fineness of the yarn constituted by one or more potential generating filaments 10. Furthermore, the unit "dtex" is intended to be the unit of thread thickness of 1 g with a length of 10,000 m. The number of potential generating filaments 10 is set so as to achieve the total fineness. As long as the total fineness is 90 dtex or more, the number of potential generating filaments 10 may be one or two or more. As an example, the number is 20 or more and 600 or less. Furthermore, the term "large diameter" as used herein is intended to mean a diameter larger than that of a normal filament, and more specifically, as mentioned above, a diameter with a total fineness of 90 dtex or more. The filament is intended to have a

Hereinafter, in order to describe the yarn in detail, an embodiment in which the potential generating filament 10 includes a piezoelectric material, and such piezoelectric material is "polylactic acid" will be cited as an example.

As shown in FIG. 1(A), the potential generating filament 10 comprising uniaxially stretched polylactic acid has a thickness direction as a first axis, a stretching direction 900 as a third axis, and both the first and third axes. When the orthogonal direction is defined as the second axis, it has tensor components of d14 and d25 as piezoelectric strain constants.

Therefore, polylactic acid can most efficiently generate a charge (or potential) when it is strained in a direction of 45 degrees with respect to the direction in which it is uniaxially stretched.

2(A) and 2(B) are diagrams showing the relationship between the uniaxial stretching direction of polylactic acid, the potential direction, and the deformation of the fibers including the potential generating filament 10 and/or the thread 1.

As shown in FIG. 2A, when the potential generating filament 10 contracts in the direction of the first diagonal line 910A and extends in the direction of the second diagonal line 910B perpendicular to the first diagonal line 910A, the potential generating filament 10 moves from the back side to the front side of the page. can generate a potential. That is, the potential generating filament 10 can generate negative charges on the front side of the paper. As shown in FIG. 2(B), the potential generating filament 10 can also generate charge (or potential) when it extends in the direction of the first diagonal line 910A and contracts in the direction of the second diagonal line 910B; Conversely, a potential can be generated in the direction from the front surface of the paper to the back side. That is, the potential generating filament 10 can generate positive charges on the front side of the paper.

The yarn 1s shown in FIG. 1 is a yarn (multifilament yarn) (S yarn) formed by twisting a plurality of potential generating filaments 10 containing such polylactic acid (there is no particular restriction on the twisting method). The stretching direction 900 of each potential generating filament 10 coincides with the axial direction of each potential generating filament 10. Therefore, the stretching direction 900 of the potential generating filament 10 is inclined to the left with respect to the axial direction of the yarn 1. Note that the angle depends on the number of twists.

When a tension (preferably axial tension) or stress (preferably axial tensile stress) is applied as an "external force" to the thread 1s, which is such an S thread, a negative (-) A positive (+) charge (or potential) can be generated inside it.

The thread 1s can form a potential due to the potential difference that can be generated by this charge. This potential can also leak into the nearby space and form a bonding potential with other parts. Further, the potential generated in the thread 1s causes a potential to be generated between the thread 1 and the object when it comes close to an object having a predetermined potential (including ground potential) such as a human body. You can also do that.

Moreover, since the yarn 1s has a total fineness of 90 dtex or more, it is a relatively thick yarn. Therefore, even if the thread 1s is difficult to stretch, it is a relatively thick thread, so that the potential-generating filament 10 can generate a surface potential that can suppress the growth of bacteria. Specifically, the surface potential generated by applying an external force can be, for example, 0.1V or more, preferably 1.0V or more. Both positive and negative surface potentials can be generated. Specifically, in the case of yarn 1s, when the initial state of elongation is 0 is set to 0V, the surface potential when pulled is negative, and when the tension is set to 0V and contracted, the surface potential is positive. Occur. Here, there is no particular restriction on the method for measuring the surface potential, and it can be measured using, for example, a scanning probe microscope.

In addition, the surface potential not only suppresses the growth of bacteria, but may also have a direct bactericidal and virucidal effect, generating a potential opposite to that of bacteria, fungi, and viruses. The effect may be caused by keeping bacteria and viruses away by causing the bacteria to evaporate.

[About the yarn of the second embodiment (so-called Z yarn embodiment)]
In the embodiment shown in FIG. 3(A), the yarn 1z may be a right-handed yarn (hereinafter referred to as "Z yarn") that is twisted by turning the potential generating filament 10 to the right. Here, since the thread 1z is a Z thread, the stretching direction 900 of the potential generating filament (or piezoelectric fiber) 10 may be inclined to the right with respect to the axial direction of the thread 1z. Note that the angle depends on the number of twists of the yarn. Further, the polarities of the charges (or potentials) generated in the yarn 1s and the yarn 1z are different from each other.

The yarn 1z has a "total fineness of 90 dtex or more." The number of potential generating filaments 10 is set so as to achieve the total fineness. As long as the total fineness is 90 dtex or more, the number of potential generating filaments 10 may be one or two or more. As an example, the number is 20 or more and 600 or less. It is preferable that the elongation rate of the yarn 1z having such a fineness is less than 10%.

When an "external force" such as tension (preferably axial tension) or stress (preferably axial tensile stress) is applied to the thread 1z, which is such a Z thread, a positive (+) force is applied to the surface of the thread 1z. A charge (or potential) is generated, and a negative (-) charge (or potential) can be generated inside it.

The yarn 1z can also form a potential due to the potential difference that can be generated by this charge. This potential can also leak into the nearby space and form a bonding potential with other parts. Further, the potential generated in the thread 1z causes an electric potential to be generated between the thread 1z and the object when it comes close to an object having a predetermined potential (including ground potential) such as a human body. You can also do that.

Note that the yarn 1s, which is an S yarn, and the yarn 1z, which is a Z yarn, can be understood more deeply by reading Japanese Patent No. 6428979. Furthermore, Japanese Patent No. 6428979 is incorporated herein by reference.

[About the thread of the third embodiment (embodiment of the thread provided with a so-called dielectric material)]
Additionally, the thread may be provided with a "dielectric" around the potential generating filament 10. For example, as schematically shown in the cross-sectional view of FIG. 4, a dielectric 100 can be provided around the potential generating filament 10.

In the present disclosure, the term "dielectric" refers to a material or substance that has "dielectricity" (the property of being electrically polarized (or dielectric polarization or electric polarization) depending on the potential), and whose surface can store charge.

The dielectric 100 may be present in the longitudinal axis direction and the circumferential direction of the potential generating filament 10, and may completely or partially cover the potential generating filament. Note that when the dielectric 100 partially covers the potential generating filament 10, the potential generating filament 10 itself may be exposed as it is in the uncovered portion.

Therefore, the dielectric 100 may be provided entirely or partially in the longitudinal axis direction of the potential generating filament 10. Further, the dielectric 100 may be provided entirely or partially in the circumferential direction of the potential generating filament 10.

Furthermore, the dielectric 100 may have a uniform or non-uniform thickness (see, for example, FIG. 4).

The dielectric 100 may be present between the plurality of potential generating filaments 10, and in this case, there may be a portion between the plurality of potential generating filaments 10 where the dielectric 100 is not present. Further, bubbles or cavities may exist in the dielectric 100.

The dielectric 100 is not particularly limited as long as it includes a dielectric material or substance. As the dielectric material 100, a dielectric material (for example, an oil agent, an antistatic agent, etc.) that is known to be used as a surface treatment agent (or fiber treatment agent) mainly in the textile industry may be used.

In the thread 1, the dielectric 100 preferably includes an oil agent. As the oil agent, an oil agent (filtering oil agent) used as a surface treatment agent (or fiber treatment agent) that can be used in the production of the potential generating filament 10 can be used (for example, an anionic, cationic or nonionic interface active agents, etc.). In addition, oil agents (for example, anionic, cationic or nonionic surfactants, etc.) used as surface treatment agents (or fiber treatment agents) that can be used in the process of cloth making (for example, knitting, weaving, etc.), Oil agents (for example, anionic, cationic, or nonionic surfactants) used as surface treatment agents (or fiber treatment agents) that can be used in the finishing process can also be used. Here, as representative examples, a filament manufacturing process, a fabric manufacturing process, a finishing process, etc. are listed, but the process is not limited to these processes. As the oil agent, it is preferable to use an oil agent that is used particularly for reducing the friction of the potential generating filament 10.

Examples of the oil agent include the Delion series manufactured by Takemoto Yushi Co., Ltd., the Marposol series manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd., the Marposize series, and the Paratex series manufactured by Marubishi Yuka Kogyo Co., Ltd.

The oil agent may be present all along the potential generating filament 10, or may be present along at least a portion thereof. Further, after the potential generating filament 10 is processed into the yarn 1, at least a portion or all of the oil may fall off from the potential generating filament 10 by washing.

Further, the dielectric material 100 used to reduce the friction of the potential generating filament 10 may be a surfactant such as a detergent or a softener used during washing.

Examples of detergents include the Attack (registered trademark) series manufactured by Kao Corporation, the Top (registered trademark) series manufactured by Lion Corporation, and the Ariel (registered trademark) series manufactured by Procter & Gamble Japan Co., Ltd. .

Examples of fabric softeners include the Humming (registered trademark) series manufactured by Kao Corporation, the Soflan (registered trademark) series manufactured by Lion Corporation, and the Lenor (registered trademark) series manufactured by Procter & Gamble Japan Co., Ltd. It will be done.

The dielectric 100 may have conductivity (the property of conducting electricity), and in that case, the dielectric 100 preferably contains an antistatic agent. As the antistatic agent, an antistatic agent that is used as a surface treatment agent (or fiber treatment agent) that can be used in manufacturing the potential generating filament 10 can be used. As the antistatic agent, it is preferable to use an antistatic agent that is particularly used to reduce unraveling of the potential generating filament 10.

Examples of the antistatic agent include the Capron series manufactured by Nissin Kagaku Kenkyusho Co., Ltd., the Nicepol series manufactured by NICCA Chemical Co., Ltd., and the Daytron series.

The antistatic agent may be present entirely or at least partially along the potential generating filament 10. Further, after the potential generating filament 10 is processed into the yarn 1, at least a portion or all of the antistatic agent may fall off from the potential generating filament 10 by washing.

Further, the surface treatment agent (or fiber treatment agent) such as the above-mentioned oil and antistatic agent, detergent, softener, etc. do not need to be present around the potential generating filament 10. That is, the potential generating filament 10 or the thread may not contain a surface treatment agent (or fiber treatment agent) such as the above-mentioned oil agent or antistatic agent, detergent, softener, or the like. In that case, the air (or air layer) existing between the potential generating filaments 10 can function as a dielectric. Therefore, in this case the dielectric comprises air.

For example, by washing or soaking a thread in a solvent, the yarn may be treated with a surface treatment agent (or fiber treatment agent) such as the above-mentioned oil or antistatic agent, detergent, or fabric softener around the potential-generating filament 10. Yarn containing no surface treatment agent (or fiber treatment agent), detergent, softener, etc. may be used. In that case, the solid potential generating filament 10 will be exposed. Alternatively, a yarn comprising only solid potential-generating filaments 10 may be used in the present disclosure.

Further, in the present disclosure, surface treatment agents (or fiber treatment agents) such as the above-mentioned oils and antistatic agents, detergents, fabric softeners, etc. are partially removed by treatments such as washing or dipping in solvents, so that the solid wood is A thread in which the potential generating filament 10 is partially exposed may also be used.

The thickness of the dielectric 100 (or the interval between the potential generating filaments 10) is about 0 μm to about 10 μm, preferably about 0.5 μm to about 10 μm, more preferably about 2.0 μm to about 10 μm, and generally about 5 μm. be.

[About the yarn of the fourth embodiment (embodiment of so-called false twisted yarn)]
In a preferred embodiment, the yarn may be in the form of a false twisted yarn. As used herein, "false twisted yarn" refers to yarn that has been twisted while applying heat, and then untwisted by further twisting in the opposite direction. , is intended to be a yarn with a relatively thick yarn diameter by combining a plurality of false twisted yarns. Furthermore, the "false twisted yarn" may be in the form of a yarn in which loops, spirals, coils, etc. are generated in the filaments.

The yarn of this embodiment includes a first false-twisted yarn in which a plurality of potential-generating filaments are twisted in one direction, and a first false-twisted yarn in which a plurality of potential-generating filaments are twisted in one direction and the opposite direction. The second false twisted yarn may be combined. Specifically, a form is intended in which a yarn obtained by falsely twisting the S yarn 1s described in the above-mentioned first embodiment and a yarn obtained by falsely twisting the Z yarn 1z described in the above-mentioned second embodiment are combined. ing.

The yarn (false twisted yarn) of this embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a schematic diagram of the false twisted yarn manufacturing device, FIG. 6(a) is a schematic diagram of the yarn in a twisted state, and FIG. 6(b) is a schematic diagram of the yarn before entangling treatment by an air jet device. FIG. 6(c) is a schematic diagram of the yarn after the interlacing treatment.

As a description of the yarn (false twisted yarn) of this embodiment, a method for manufacturing the yarn will be described. First, the S yarn 1s containing potential generating filaments is set on one side of the false twisted yarn manufacturing apparatus, and the Z yarn 1z containing potential generating filaments is set on the other side of the false twisted yarn manufacturing apparatus. Each yarn is passed through the heater H in its twisted state (FIG. 6(a)). Each yarn coming out of the heater H is in an untwisted state (FIG. 6(b)). By subjecting these false-twisted yarns to air entanglement treatment using an air jet device AJ, a yarn 1 in the form of a false-twisted yarn as shown in FIG. 6(c) is obtained.

Since the yarn in the form of false twisted yarn has a total fineness of 90 dtex or more, it is a relatively thick yarn. Therefore, even if the elongation rate of the thread 1 is low, it is a relatively thick thread, so that the potential generating filament 10 can generate a surface potential to an extent that can suppress the growth of bacteria. Specifically, the surface potential generated by applying an external force can be, for example, 0.1V or more, preferably 1.0V or more.

Moreover, since the yarn 1 in the form of a false twisted yarn is twisted by an air jet nozzle, a crimped yarn with bulky properties can be obtained. In other words, the presence of the loop-like fluff makes it possible to obtain a spun-like yarn that has the bulge and soft feel of a spun yarn.

In addition, when false twisting the S yarn and Z yarn described in this embodiment, the torques of the left-turning S yarn and the right-turning Z yarn cancel each other out, so that the subsequent fabric dyeing process, etc. It is also possible to suppress the skew of the knitted fabric. Note that the false twisted yarn is not limited to the mode using S yarns and Z yarns, but may also be a mode in which S yarns are doubled together, or a mode in which Z yarns are tied together.

In the above explanation, the S yarn 1s shown in FIG. 1 in which the seven potential generating filaments 10 are twisted and the Z yarn 1z in which the seven potential generating filaments 10 shown in FIG. , a method for manufacturing a yarn with a total fineness of 90 dtex or more was described using 14 potential generating filaments 10, but the number of filaments is not limited to this example. For example, the number of filaments may be two or more. Preferably, the number is 20 or more. Further, in order to increase the surface potential generated by the potential generating filaments 10, it is preferable to increase the number of potential generating filaments, but from the viewpoint of knitted fabrics for clothing, the number of potential generating filaments 10 should be 600 or less. It is preferable.

[About other preferred embodiments of yarn]
In the thread 1, the potential generating filament 10 is preferably composed of polylactic acid (PLA). When the potential generating filament 10 contains a piezoelectric material such as polylactic acid, the surface potential can be controlled more appropriately. In addition, since polylactic acid is hydrophobic, it can provide a smooth texture, thereby providing comfort to the knitted structure. Furthermore, since polylactic acid is known as a biodegradable plastic, it can ultimately be decomposed into CO ₂ and water, reducing the burden on the environment.

The degree of crystallinity of "polylactic acid" is preferably 20% or more, preferably 30% or more, more preferably 40% or more, even more preferably 50% or more, particularly preferably 55% or more. The degree of crystallinity can be measured by, for example, differential scanning calorimetry (DSC), X-ray diffraction (XRD), wide angle X-ray diffraction (WAXD), etc. It can be determined by a method. Within this range, the piezoelectricity derived from the polylactic acid crystal becomes high, and polarization due to the piezoelectricity of the polylactic acid can be caused more effectively. In addition, in the present disclosure, the crystallinity measurement value measured using WAXD and the crystallinity measurement value measured using DSC are different from each other by about 1.5 times (DSC measurement value/WAXD measurement value). A value of ≒1.5) was obtained.

The piezoelectric material of the present disclosure can be used in addition to polylactic acid-based polymers, such as polypeptide-based (e.g., poly(γ-benzyl glutarate), poly(γ-methyl glutarate), etc.), cellulose-based (e.g., acetic acid Optically active polymers such as cellulose, cyanoethyl cellulose, etc.), polybutyric acid (eg, poly(β-hydroxybutyric acid), etc.), polypropylene oxide, and derivatives thereof may be used as the piezoelectric polymer.

The yarn (potential generating filament) or fabric (garment) of the present disclosure preferably does not contain additives such as plasticizers and/or lubricants. Generally, it is known that when threads or fabrics contain additives, surface potential tends to be less likely to occur. Therefore, in order to appropriately generate a surface potential, it is preferable that the thread or cloth does not contain any additives. A "plasticizer" as used herein is a material that imparts flexibility to a thread or cloth, and a "lubricant" is a material that improves the sliding of molecules of a piezoelectric thread. Specifically, polyethylene glycol, castor oil fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyethylene glycol fatty acid ester, stearamide and/or glycerin fatty acid ester are intended. These materials are not included in the yarns or fabrics of the present disclosure.

The yarn (potential generating filament) or fabric (garment) of the present disclosure may contain a hydrolysis inhibitor. In particular, it may contain a hydrolysis inhibitor for polylactic acid (PLA). An example of the hydrolysis inhibitor may include carbodiimide. More preferably, it may contain a cyclic carbodiimide. More specifically, it may be a cyclic carbodiimide described in Japanese Patent No. 5,475,377. According to such a cyclic carbodiimide, the acidic groups of the polymer compound can be effectively blocked. Note that a carboxyl group blocking agent may be used in combination with the cyclic carbodiimide compound to the extent that the acidic groups of the polymer can be effectively blocked. Examples of such carboxyl group-blocking agents include those described in JP-A No. 2005-2174, such as epoxy compounds, oxazoline compounds and/or oxazine compounds.

The role of the hydrolysis inhibitor will be explained below. Conventionally known fibers or filaments containing PLA (fibers or filaments that do not generate a surface potential) generate an acid through hydrolysis of PLA, and the acid acts on bacteria, thereby exerting an antibacterial effect. was. Therefore, when hydrolysis occurs in PLA, the fibers or filaments deteriorate. However, the potential-generating fiber or potential-generating filament of the present disclosure has a different antibacterial mechanism from the conventional one and exerts an antibacterial effect by generating a surface potential as described above, so there is no need to cause hydrolysis. Furthermore, since the potential generating fiber or potential generating filament of the present disclosure contains a hydrolysis inhibitor, it is possible to prevent hydrolysis of the fiber or filament and suppress deterioration of the fiber or filament.

The yarns of the present disclosure should not be construed as limited to the embodiments described above, particularly yarns that may be constructed from polylactic acid. Further, there is no particular restriction on the method for manufacturing the yarn of the present disclosure, and the method is not limited to the above manufacturing method.

-Description of the cloth and clothing of the present disclosure-
The fabric of the present disclosure has a large diameter with a total fineness of 90 dtex or more, and includes a yarn containing a potential generating filament that generates a potential by receiving energy from the outside. Furthermore, the clothing of the present disclosure uses cloth containing the thread. The elongation of the cloth is relatively difficult to elongate. In other words. Preferably, the elongation rate is less than 10%. Fabrics of the present disclosure include woven fabrics, knitted fabrics, nonwoven fabrics, and the like. Furthermore, in the present disclosure, the term "fabric" is intended to refer to a material for making clothes, but is used synonymously with "cloth."

Here, as an example of cloth, a knitted fabric made by knitting the above-mentioned threads will be specifically explained. Here, the term "knitted fabric" as used herein refers to a sheet-like structure having a structure in which a plurality of loops are connected to each other, that is, a knit structure. For example, a knitted fabric can be knitted by creating a loop (for example, a ring-shaped part) of yarn and hooking the next loop through the loop to form a surface or texture. More specifically, the knitted fabric may have a structure that can be formed by a knitting method such as weft knitting, warp knitting, circular knitting, tube knitting, or sock knitting. Such knitted fabrics also include tricot and raschel. Further, sewn products such as cut-and-sew products and knit-sew products are also included in the knitted products of the present disclosure. Further, unsewn products such as WHOLEGARMENT are also included in the knitted fabric of the present disclosure (WHOLEGARMENT (registered trademark)). In other words, the concept is clearly different from that of textiles, where the warp and weft threads intersect at right angles to form fabric.

Examples of the textures that can be included in the knitted fabric of the present disclosure include jersey (also called flat knitting and stockinette knitting), bare jersey, plating jersey, smooth (also called interlock), pique (front pique, back pique), and knit miss ( These include, but are not limited to, structures such as float (also called float), honeycomb, thermal (also called waffle), and milling. The texture may be different on the front and back sides of the knitted fabric. Further, the tissue may include "tack". In other words, tuck knitting may be used in combination. Organizations may contain "mistakes". The knitted fabric may have a pile back or a raised back. Depending on the tissue, the feel, breathability, stretchability, etc. of the fabric can be changed.

In this disclosure, a tissue that includes repeating minimum units of "knit", optionally "tuck" and/or "miss" is referred to as "complete tissue".

Such a structure may be formed using a knitting machine or by hand knitting. When using a knitting machine, there is no particular restriction on the type of knitting machine, and conventionally known knitting machines can be used without particular restrictions.

Note that in the above description, the fabric of the present disclosure was explained as a knitted fabric, but it may also be a textile product such as a woven fabric, a braided fabric, a nonwoven fabric, or a lace.

Examples 1 to 5 and Comparative Examples 1 to 5 of garments were manufactured using fabrics containing yarns of the present disclosure.

-Example 1-
144 potential generating filaments with a fineness of 1.15 dtex per filament were prepared, and a total fineness of 167 dtex was achieved as the yarn described in Embodiments 1 to 4 above.

A knitted fabric was manufactured using the yarn containing the potential generating filament and the nylon yarn. The knitted fabric was made into a plating jersey structure using a computerized flat knitting machine manufactured by Shima Seiki Seisakusho. After performing a normal dyeing process on this knitted fabric, clothes (sweat products) were manufactured using the knitted fabric.

-Example 2-
144 potential generating filaments with a fineness of 1.15 dtex per filament were prepared, and a total fineness of 167 dtex was achieved as the yarn described in Embodiments 1 to 4 above.

A knitted fabric was manufactured using the yarn containing the potential generating filament. The knitted fabric was made into a honeycomb structure using a double 28 gauge knitting machine (LPJ25 type knitting machine manufactured by Fukuhara Seiki Co., Ltd.). After performing a normal dyeing process on this knitted fabric, clothes (pants products) were manufactured using the knitted fabric.

-Example 3-
576 potential generating filaments with a fineness of 0.573 dtex per filament were prepared, and a total fineness of 330 dtex was achieved as the yarn described in Embodiments 1 to 4 above.

A knitted fabric was manufactured using a yarn containing the potential generating filament, a nylon yarn, and a polyester yarn. The knitted fabric was made to have a connective tissue structure on both sides using a double 28 gauge knitting machine (LPJ25 type knitting machine manufactured by Fukuhara Seiki Co., Ltd.). After performing a normal dyeing process on this knitted fabric, clothes (jersey products) were manufactured using the knitted fabric.

-Example 4-
Forty-eight potential-generating filaments with a fineness of 2.29 dtex per filament were prepared, and a total fineness of 110 dtex was achieved as the yarn described in Embodiments 1 to 4 above.

A knitted fabric was produced using a yarn containing the potential generating filament and a nylon yarn (24 filaments, total fineness 78 dtex). The knitted fabric was made into a back half weave structure using a warp knitting 28 gauge knitting machine (HKS type knitting machine manufactured by Karl Mayer). After performing a normal dyeing process on this knitted fabric, clothes (medical uniform products) were manufactured using the knitted fabric.

-Example 5-
Twenty-four potential generating filaments with a fineness of 4.58 dtex per filament were prepared, and a total fineness of 110 dtex was achieved as the yarn described in Embodiments 1 to 4 above.

A woven fabric was manufactured using a yarn containing the potential generating filament and a polyester yarn (24 filaments, total fineness of 56 dtex). The woven fabric had a plain weave structure. After performing a normal dyeing process on this woven fabric, a garment (jacket product) was manufactured using the woven fabric.

-Comparative example 1-
We prepared 72 potential-generating filaments with a fineness of 1.17 dtex per filament, achieving a total fineness of 84 dtex. In other words, the fineness per filament is comparable to that in Example 1, but since the number of filaments is smaller than in Example 1, the total fineness is less than 90 dtex.

A knitted fabric was manufactured using the yarn containing the potential generating filament and the polyester yarn. The knitted fabric was made into a plating jersey structure using a double 22 gauge knitting machine (LPJH type knitting machine manufactured by Fukuhara Seiki Co., Ltd.). After performing a normal dyeing process on this knitted fabric, clothes (sweat products) were manufactured using the knitted fabric.

-Comparative example 2-
We prepared 72 potential-generating filaments with a fineness of 1.17 dtex per filament, achieving a total fineness of 84 dtex. In other words, the total fineness is less than 90 dtex.

A knitted fabric was manufactured using a polyester yarn and a yarn containing the potential generating filament. The knitted fabric was made to have a connective tissue structure on both sides using a double 28 gauge knitting machine (LPJ25 type knitting machine manufactured by Fukuhara Seiki Co., Ltd.). After performing a normal dyeing process on this knitted fabric, clothes (jersey products) were manufactured using the knitted fabric.

-Comparative example 3-
Thirty-six potential-generating filaments with a fineness of 1.56 dtex per filament were prepared, and a total fineness of 56 dtex was achieved. In other words, the total fineness is less than 90 dtex.

A knitted fabric was manufactured using a polyester yarn and a yarn containing the potential generating filament. The knitted fabric was made into a honeycomb structure using a double 22 gauge knitting machine (LPJH type knitting machine manufactured by Fukuhara Seiki Co., Ltd.). After performing a normal dyeing process on this knitted fabric, a garment (jacket product) was manufactured using the knitted fabric.

-Comparative example 4-
Thirty-six potential-generating filaments with a fineness of 1.56 dtex per filament were prepared, and a total fineness of 56 dtex was achieved. In other words, the total fineness is less than 90 dtex.

A knitted fabric was manufactured using a nylon yarn and a yarn containing the potential generating filament. The knitted fabric was made into a back half weave structure using a warp knitting 28 gauge knitting machine (HKS type knitting machine manufactured by Karl Mayer). After performing a normal dyeing process on this knitted fabric, clothes (medical uniform products) were manufactured using the knitted fabric.

-Comparative example 5-
Thirty-six potential generating filaments with a fineness of 1.56 dtex per filament were prepared, and a total fineness of 56 dtex was achieved. In other words, the total fineness is less than 90 dtex.

A woven fabric was produced using the yarn containing the potential generating filament and the polyester yarn. The woven fabric had a plain weave structure. After performing a normal dyeing process on this woven fabric, a garment (jacket product) was manufactured using the woven fabric.

For the above Examples 1 to 5 and Comparative Examples 1 to 5, elongation rate evaluation, surface potential evaluation, and antibacterial evaluation were performed. The specific evaluation contents are described below.

(Elongation rate evaluation)
After wearing the products of Examples and Comparative Examples, distortion was measured at the parts that stretch as clothing (for example, the armpits and crotch) during walking motion, and the elongation rate was measured based on the measurements. The measurement equipment, measurement range, and measurement conditions are as follows.
Measuring equipment: ARAMIS Adjustable Base 12M
Measuring range: 1160×940× ^940mm2
Measurement conditions: 7Hz, f4.0

(Surface potential evaluation)
For the products of Examples and Comparative Examples, the surface potential of the cloth was measured using an Electric Force Microscope (EFM) (Model 1100TN, manufactured by Trek). The surface potential was evaluated using a potential measuring device (patent application No. 2021-065673 (see issue). That is, (a) the yarn described in Patent Document 1 (International Publication No. 2020/241432) is stretched by a predetermined amount in the uniaxial direction. (b) Covering a core material made of conductive fibers with fibers. (c) Ground the core material. (d) Measure the surface potential of the yarn using an electric force microscope. We adopted a measurement method different from that used in the previous study.

(Antibacterial evaluation)
The contents of the antibacterial test are as follows.
(1) Measure the number of viable bacteria for the products of Comparative Examples and Examples in their initial state.
(2) Measure the number of viable bacteria after allowing the products of Comparative Examples and Examples to stand for 18 hours.
(3) For the products of Comparative Examples and Examples that were allowed to stand for 18 hours, the number of viable bacteria was measured after the products were expanded and contracted for 18 hours to generate a surface potential.
That is, the "antibacterial activity value" of the present disclosure is intended to be a value calculated from the following.
Antibacterial activity value = viable bacteria count A - viable bacteria count B
Viable cell count A: Viable cell count after standing still for 18 hours Viable cell count B: Viable cell count after the product is expanded and contracted continuously for 18 hours to generate a surface potential Note that the evaluation of viable cell count is based on a patent. As described in Japanese Patent No. 6922546 and Japanese Patent No. 6292368, this was carried out based on the method of JIS L1902. Note that the numerical value of the number of viable bacteria indicates the logarithmic value of Colony Forming Unit (logarithmic value of colonies per 1 g).

The results of the elongation rate evaluation, surface potential evaluation, and antibacterial evaluation are shown in the table below.

According to the results in Tables 1 and 2, the clothes of Examples 1 to 5 had large diameter yarns with a total fineness of 90 dtex or more, and therefore had surface potentials greater than 0.1V. Furthermore, since the antibacterial activity value was 1.5 or more, good antibacterial properties were obtained.

In the clothes of Examples 1 to 5, since the total fineness was 350 dtex or less, it was possible to obtain enough elongation to generate a surface potential on the potential generating filament.

Furthermore, according to the results of Examples 3 to 5, by setting the number of potential generating filaments to 20 or more, it is possible to realize a yarn with a large diameter of 90 dtex or more as a total fineness, and the desired surface can be achieved with the yarn. The result was that it was possible to generate a potential.

Furthermore, according to the results of Examples 1 and 2, even if the number of potential-generating filaments is 600 or less, it is possible to realize a yarn with a large diameter of 90 dtex or more as a total fineness, and the desired surface can be achieved with the yarn. The result was that it was possible to generate a potential.

On the other hand, the clothes of Comparative Examples 1 to 5 had a surface potential of 0.1 V or less because the yarns had a total fineness of less than 90 dtex. Since the antibacterial activity value was less than 1.5, the antibacterial properties were poor compared to the clothes of Examples 1 to 5.

Aspects of the yarn, fabric, and garment of the present disclosure are as follows.
<1> A yarn having a large diameter with a total fineness of 90 dtex or more and containing a potential-generating filament that generates a potential by receiving energy from the outside.
<2> The yarn according to <1>, wherein the total fineness is 350 dtex or less.
<3> The yarn according to <1> or <2>, wherein the number of the potential generating filaments is 20 or more.
<4> The yarn according to any one of <1> to <3>, wherein the number of potential generating filaments is 600 or less.
<5> The yarn according to any one of <1> to <4>, wherein the potential generating filament comprises a piezoelectric material.
<6> The thread according to any one of <1> to <5>, wherein the piezoelectric material comprises polylactic acid.
<7> The thread according to any one of <1> to <6>, wherein the piezoelectric material does not contain an additive.
<8> The thread according to any one of <1> to <7>, wherein the piezoelectric material contains a hydrolysis inhibitor.
<9> A first false-twisted yarn in which a plurality of potential-generating filaments are twisted in one direction, and a first false-twisted yarn in which a plurality of potential-generating filaments are twisted in a direction opposite to the one direction. The yarn according to any one of <1> to <8>, which is formed by combining two false twisted yarns.
<10> The yarn according to any one of <1> to <9>, which generates a surface potential greater than 0.1V.
<11> A cloth comprising the thread according to any one of <1> to <10>.
<12> The cloth according to <11>, which constitutes a knitted fabric by knitting the yarn.
<13> The cloth according to <11>, which constitutes a woven fabric by weaving the threads.
<14> The cloth according to any one of <11> to <13>, which has an antibacterial activity value of 1.5 or more.
<15> The fabric according to any one of <11> to <14>, which has an elongation rate of less than 10%.
<16> Clothes using the fabric according to any one of <11> to <15>.

Note that the embodiments disclosed herein are illustrative in all respects, and are not the basis for a limited interpretation. Therefore, the technical scope of the present invention should not be interpreted only by the above-described embodiments, but should be defined based on the claims. Further, the technical scope of the present invention includes all changes within the meaning and scope equivalent to the scope of the claims.

The present disclosure can be utilized, for example, in yarns, fabrics, and clothing that can effectively generate a surface potential even with low elongation.

1, 1s, 1z Yarn 10 Potential generating filament 100 Dielectric 900 Stretching direction 910A First diagonal 910B Second diagonal H Heater AJ Air jet device

Claims (16)

A yarn that has a large diameter with a total fineness of 90 dtex or more and includes a potential-generating filament that generates a potential by receiving energy from the outside. The yarn according to claim 1, wherein the total fineness is 350 dtex or less. The yarn according to claim 1, wherein the number of the potential generating filaments is 20 or more. The yarn according to claim 1, wherein the number of potential generating filaments is 600 or less. The thread of claim 1, wherein the potential generating filament comprises a piezoelectric material. 6. The thread of claim 5, wherein the piezoelectric material comprises polylactic acid. 7. Thread according to claim 6, wherein the piezoelectric material does not contain additives. 7. The thread of claim 6, wherein the piezoelectric material contains an anti-hydrolysis agent. a first false-twisted yarn in which a plurality of potential-generating filaments are twisted in one direction;
2. The yarn according to claim 1, wherein the plurality of potential generating filaments are formed by combining a second false twisted yarn obtained by false twisting yarns twisted in the opposite direction to the one direction. A yarn according to claim 1, which develops a surface potential of greater than 0.1V. A fabric comprising a yarn according to any one of claims 1 to 10. The cloth according to claim 11, which constitutes a knitted fabric by knitting the yarn. 12. The fabric according to claim 11, wherein the threads are woven to form a woven fabric. The cloth according to claim 11, having an antibacterial activity value of 1.5 or more. 12. The fabric according to claim 11, wherein the elongation is less than 10%. Clothes using the cloth according to claim 11.

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