WO2020111049A1 - Antibacterial twisted yarn, and antibacterial yarn and antibacterial fabric provided with antibacterial twisted yarn - Google Patents

Abstract

This antibacterial twisted yarn is characterized by being provided with: long fibers (11) which are made from normal fibers or piezoelectric fibers that with external energy generate a charge, and short fibers/long fibers (12) which are made from piezoelectric fibers in the case that the long fibers (11) are made from normal fibers, and are made from piezoelectric fibers or normal fibers in the case that the long fibers (11) are made from piezoelectric fibers.

Description

Antibacterial twisted yarn, and antibacterial yarn and antibacterial cloth including the antibacterial twisted yarn

The present invention relates to an antibacterial twisted yarn having antibacterial properties, and an antibacterial yarn and an antibacterial cloth including the antibacterial twisted yarn.

Patent Document 1 discloses a yarn having antibacterial properties. The yarn disclosed in Patent Document 1 includes a charge generation fiber that generates an electric charge by energy from the outside. The yarn disclosed in Patent Document 1 includes a plurality of charge-generating fibers having different polarities of the generated charges, thereby generating charges between the charge-generating fibers and exerting an antibacterial effect.

JP, 2008-090950, A

When the fibers are twisted tightly, the gap between the fibers becomes smaller. When the voids between the fibers become smaller, the electric charge generated between the fibers becomes less likely to leak to the outside of the yarn.

Therefore, an object of the present invention is to provide an antibacterial twisted yarn having a higher antibacterial effect than a conventional yarn having antibacterial properties, and an antibacterial yarn and an antibacterial cloth including the antibacterial twisted yarn.

The antibacterial twisted yarn of the present invention comprises a long fiber made of piezoelectric fiber or ordinary fiber that generates an electric charge by external energy, and a piezoelectric fiber when the long fiber is made of ordinary fiber, and the long fiber made of piezoelectric fiber. In some cases, piezoelectric fibers or short fibers made of ordinary fibers are provided.

It has been known that the growth of bacteria and fungi can be suppressed by an electric field (see, for example, Tetsuaki Doto, Hironori Korai, Hideaki Matsuoka, Junichi Koizumi, Kodansha: Microbial control-science and engineering). Also see, for example, Koichi Takagi, Application of High Voltage/Plasma Technology to Agriculture and Food Field, J.HTSJ, Vol.51, No.216). In addition, due to the potential difference that causes this electric field, current may flow through a current path formed by moisture or the like or a circuit formed by a local micro discharge phenomenon or the like. It is considered that this current weakens the bacteria and suppresses the growth of the bacteria.

The antibacterial twisted yarn according to the present invention is provided with piezoelectric fibers that generate an electric charge by energy from the outside, so that it has a predetermined potential (including ground potential) between the fibers or between the fibers. Generates an electric field when in close proximity. Alternatively, the antibacterial twisted yarn according to the present invention generates an electric current when it comes close to an object having a predetermined potential (including a ground potential) such as a human body through the moisture such as sweat or between the fibers. Shed.

Therefore, the antibacterial twisted yarn according to the present invention exhibits an antibacterial effect for the following reasons. By the direct action of the electric field or electric current generated when applied to objects (clothing, footwear, or medical supplies such as masks) used in the vicinity of objects having a predetermined potential such as the human body The electron transfer system for life support is disturbed, the bacteria die, or the bacteria themselves weaken. In addition, oxygen contained in water may be changed into active oxygen species by an electric field or electric current, or oxygen radicals may be generated in the cells of the bacterium due to a stress environment due to the presence of an electric field or electric current. Bacteria are killed or weakened by the action of reactive oxygen species including radicals. In some cases, the above reasons are combined to produce an antibacterial effect. The “antibacterial” referred to in the present invention is a concept including both the effect of suppressing the generation of bacteria and the effect of killing the bacteria.

Note that it is considered that the piezoelectric fiber that generates an electric charge by energy from the outside includes, for example, a substance having a photoelectric effect, a substance having a pyroelectric effect, or a fiber using a piezoelectric body or the like. Further, a configuration in which a piezoelectric fiber contains a conductor, which is wound with an insulator, and a voltage is applied to the conductor to generate an electric charge can be used as the piezoelectric fiber.

When using a piezoelectric body, an electric field is generated by the piezoelectric, so there is no need for a power source and there is no risk of electric shock. In addition, the life of the piezoelectric body lasts longer than the antibacterial effect of a drug or the like. It is also less likely to cause an allergic reaction than drugs.

The antibacterial twisted yarn according to the present invention comprises long fibers and short fibers. When the long fiber and the short fiber are twisted together, the long fiber is likely to be swung along a predetermined direction. At this time, the short fibers are easily swirled along a random direction with respect to the long fibers. In the antibacterial twisted yarn, all the long fibers and short fibers are not swirled along a predetermined direction, so that voids are likely to occur between the long fibers, between the short fibers, or between the long fibers and the short fibers. Since the antibacterial twisted yarn has many voids between the fibers, the electric field generated by the piezoelectric fiber easily leaks to the outside of the antibacterial twisted yarn. This improves the antibacterial effect of the antibacterial twisted yarn according to the present invention.

According to the present invention, it is possible to realize an antibacterial twisted yarn having a higher antibacterial effect than a conventional yarn having antibacterial properties, and an antibacterial yarn and an antibacterial cloth including the antibacterial twisted yarn.

FIG. 1(A) is a view showing the structure of the antibacterial twisted yarn according to the first embodiment, and FIG. 1(B) is a cross-sectional view taken along the line II of FIG. 1(A). FIG. 1C is a diagram showing the structure of the antibacterial twisted yarn according to the first embodiment, and FIG. 1D is a sectional view taken along line II-II of FIG. 1C. FIG. 2A and FIG. 2B are diagrams showing the relationship among the uniaxial stretching direction in the polylactic acid film, the electric field direction, and the deformation of the polylactic acid film. 3(A) and 3(B) illustrate shear stress (shear stress) generated in each piezoelectric fiber when tension is applied to the antibacterial twisted yarn. FIG. 4 is a cross-sectional view schematically showing a part of the antibacterial twisted yarn for explaining the antibacterial mechanism in the antibacterial twisted yarn. FIG. 5: is a figure which shows the structure of the antibacterial twisted yarn which concerns on 2nd Embodiment. FIG. 6(A) is a diagram showing the structure of the antibacterial twisted yarn according to the third embodiment, and FIG. 6(B) is a sectional view taken along line III-III of FIG. 6(A). FIG. 7 is a partially exploded view showing the structure of the antibacterial yarn. FIG. 8 is a diagram showing the structure of the antibacterial cloth.

FIG. 1(A) is a diagram showing the structure of the antibacterial twisted yarn 10 according to the first embodiment, and FIG. 1(B) is a sectional view taken along the line II of FIG. 1(A). FIG. 1C is a diagram showing a configuration of the antibacterial twisted yarn 20 according to the first embodiment, and FIG. 1D is a sectional view taken along line II-II of FIG. 1C. In addition, in FIGS. 1(A) to 1(D), as an example, a cross section of seven yarns is shown in the cross section of the II line or the II-II line, but the yarns forming the antibacterial twisted yarn 10 are shown. The number of is not limited to this, and is actually set appropriately in consideration of the application and the like. Further, in FIG. 1B, only the cut surface cut along the II line is shown, and in FIG. 1D, only the cut surface cut along the II-II line is shown.

The antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 include long fibers 11 and short fibers 12, respectively. The long fibers 11 are piezoelectric fibers that generate an electric charge by energy from the outside, for example, expansion and contraction. The short fibers 12 are ordinary fibers that do not have piezoelectricity. The long fibers 11 may be ordinary fibers. In that case, the short fibers 12 are piezoelectric fibers.

The long fiber 11 is an example of a piezoelectric fiber (charge generation yarn) that generates an electric charge by expansion and contraction. The long fiber 11 is made of a functional polymer such as a piezoelectric polymer. Examples of the piezoelectric polymer include PVDF and polylactic acid (PLA). Polylactic acid (PLA) is a piezoelectric polymer that does not have pyroelectricity. Polylactic acid is uniaxially stretched to generate piezoelectricity. Polylactic acid includes PLLA in which L-form monomer is polymerized and PDLA in which D-form monomer is polymerized. The long fiber 11 may further contain a substance other than the functional polymer as long as it does not hinder the function of the functional polymer.

Polylactic acid is a chiral polymer and its main chain has a helical structure. Polylactic acid develops piezoelectricity when it is uniaxially stretched and its molecules are oriented. When heat treatment is further applied to increase the crystallinity, the piezoelectric constant increases. The uniaxially stretched long fiber 11 made of polylactic acid has a thickness direction defined as a first axis, a stretching direction 900 defined as a third axis, and a direction orthogonal to both the first axis and the third axis defined as a second axis, It has tensor components of d ₁₄ and d ₂₅ as piezoelectric strain constants. Therefore, polylactic acid most efficiently generates electric charges when strain occurs in the direction of 45 degrees with respect to the uniaxially stretched direction.

FIGS. 2A and 2B are diagrams showing the relationship between the uniaxial stretching direction of the polylactic acid film 200, the electric field direction, and the deformation of the polylactic acid film 200. 2A and 2B show a model case of a polylactic acid film 200 in which polylactic acid has a film shape. As shown in FIG. 2A, the polylactic acid film 200 shrinks in the direction of the first diagonal line 910A and extends in the direction of the second diagonal line 910B orthogonal to the first diagonal line 910A. Creates an electric field at. That is, in the polylactic acid film 200, negative charges are generated on the front side of the paper. As shown in FIG. 2(B), the polylactic acid film 200 extends in the direction of the first diagonal line 910A and also contracts in the direction of the second diagonal line 910B to generate electric charges, but the polarities thereof are reversed, and An electric field is generated in the direction from the surface to the back side. That is, in the polylactic acid film 200, positive charges are generated on the front side of the paper.

Polylactic acid does not need to be subjected to poling treatment unlike other piezoelectric polymers such as PVDF or piezoelectric ceramics, because piezoelectricity is generated by molecular orientation treatment by stretching. The uniaxially stretched polylactic acid has a piezoelectric constant of about 5 pC/N or more and about 30 pC/N or less, which is a very high piezoelectric constant among polymers. Furthermore, the piezoelectric constant of polylactic acid does not fluctuate over time and is extremely stable.

The long fiber 11 is a fiber having a circular cross section. The long fibers 11 are, for example, a method of extruding a piezoelectric polymer to form a fiber, a method of melt-spinning a piezoelectric polymer to form a fiber (for example, a spinning/drawing method in which a spinning step and a drawing step are performed separately. , A direct drawing method in which a spinning process and a drawing process are connected, a POY-DTY method in which a false twisting process can be performed at the same time, or an ultra-high-speed spinning process in which the speed is increased), a piezoelectric polymer is dry or wet. Spinning (for example, a phase separation method or a dry-wet spinning method in which a raw material polymer is dissolved in a solvent and extruded from a nozzle to form a fiber, a gel spinning method in which a gel is uniformly formed into a fiber while containing a solvent, Or a liquid crystal spinning method in which a liquid crystal solution or a melt is used to form fibers, or a method in which a piezoelectric polymer is formed into fibers by electrostatic spinning. The cross-sectional shape of the long fiber 11 is not limited to the circular shape. For example, the cross-sectional shape of the long fiber 11 may be any of a modified cross section, hollow, side-by-side, two or more layers, or a combination thereof. The single yarn fineness of the long fibers 11 is preferably 0.3 dtex or more and 10 dtex or less.

Like the long fiber 11, the short fiber 12 has a circular cross section. The fiber length of the short fibers 12 is preferably 800 mm or less, more preferably 500 mm or less, and further preferably 100 mm or less.

The single yarn fineness of the short fibers 12 is preferably 0.3 dtex or more and 10 dtex or less.

The cross-sectional shape of the short fiber 12 is not particularly limited. For example, the cross-sectional shape of the short fibers 12 may be a round cross section, an irregular cross section, hollow, side-by-side, two or more layers, or a composite of these.

The number of crimps of the short fibers 12 is 0 or more and 20 or less, and the crimp size (crimp ratio) is preferably 0% or more and 20% or less.

As a result, as described in detail below, the short fibers 12 are easily exposed to the outside from the side surface of the antibacterial twisted yarn 10 or the antibacterial twisted yarn 20.

The short fibers 12 are ordinary fibers. Plain fibers are threads that are not piezoelectric. Examples of the ordinary fibers include natural fibers such as cotton and hemp, chemical fibers such as polyester and polyurethane, regenerated fibers such as rayon and cupra, semi-synthetic fibers such as acetate, and twisted yarns obtained by twisting these. The strength and the degree of expansion and contraction of the short fibers 12 can be adjusted according to the usage mode by selecting the material of the short fibers 12.

Each of the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 constitutes a yarn (multifilament yarn) obtained by twisting a plurality of PLLA long fibers 11 and short fibers 12 as described above. The antibacterial twisted yarn 10 is a right-handed yarn (hereinafter referred to as an S yarn) obtained by twisting the long fiber 11 and the short fiber 12 by turning them to the right. The antibacterial twisted yarn 20 is a left-handed twisted yarn (hereinafter referred to as Z yarn) obtained by twisting the long fibers 11 and the short fibers 12 by turning them to the left. The long fibers 11 are easily swung along a predetermined direction. Therefore, all the long fibers 11 included in the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 rotate along the same direction.

The drawing direction 900 of each long fiber 11 coincides with the axial direction of each long fiber 11. In the antibacterial twisted yarn 10, the drawing direction 900 of the long fiber 11 is inclined to the left with respect to the axial direction 101 of the antibacterial twisted yarn 10. In the antibacterial twisted yarn 20, the drawing direction 900 of the long fiber 11 is inclined to the right with respect to the axial direction 101 of the antibacterial twisted yarn 20. The angle of inclination of the drawing direction 900 with respect to the axial direction 101 of the antimicrobial twisted yarn 10 or the antimicrobial twisted yarn 20 depends on the number of twists of the antimicrobial twisted yarn 10 or the antimicrobial twisted yarn 20. As the number of twists of the antimicrobial twisted yarn 10 or the antimicrobial twisted yarn 20 increases, the angle of inclination of the drawing direction 900 with respect to the axial direction 101 of the antimicrobial twisted yarn 10 or the antimicrobial twisted yarn 20 increases. Therefore, the angle of inclination of the long fiber 11 with respect to the axial direction 101 of the antibacterial twisted yarn 10 or the antibacterial twisted yarn 20 can be adjusted by adjusting the number of twists of the antibacterial twisted yarn 10 or the antibacterial twisted yarn 20.

In the antibacterial twisted yarn 10, the angle of inclination of the long fiber 11 with respect to the axial direction 101 of the antibacterial twisted yarn 10 is inclined to the left by 45 degrees. In the antibacterial twisted yarn 20, the angle of inclination of the long fiber 11 with respect to the axial direction 101 of the antibacterial twisted yarn 20 is inclined to the right at 45 degrees. That is, the drawing direction 900 of the long fiber 11 is inclined to the left 45 degrees with respect to the axial direction 101 of the antibacterial twisted yarn 10, and is inclined to the right 45° with respect to the axial direction 101 of the antibacterial twisted yarn 20. Is. The angle of inclination of the long fibers 11 is not limited to 45 degrees. For example, the angle of inclination of the long fibers 11 may be 10 degrees or more with respect to the axial direction 101 of the antibacterial twisted yarn 10, and may be in a range not exceeding 55 degrees. Since stress is usually applied to the antibacterial twisted yarn from various directions, electric charges are generated even if the angle of inclination of the long fiber 11 with respect to the axial direction 101 of the antibacterial twisted yarn 10 is less than 10 degrees or more than 55 degrees. As long as it is not limited to these angles.

FIG. 3(A) illustrates the shear stress (shear stress) generated in each long fiber 11 when tension is applied to the antibacterial twisted yarn 10. FIG. 3B illustrates the shear stress (shear stress) generated in each long fiber 11 when a tension is applied to the antibacterial twisted yarn 20.

As shown in FIG. 3(A), when an external force (tension) is applied to the antibacterial twisted yarn 10, the filament 11 becomes in the state shown in FIG. 2(A), and a negative charge is generated on the surface. When the external force is applied to the antibacterial twisted yarn 10, a negative charge is generated on the surface and a positive charge is generated on the inside. On the other hand, as shown in FIG. 3(B), when an external force (tension) is applied to the antibacterial twisted yarn 20, the filament 11 becomes in the state shown in FIG. 2(B), and a positive charge is generated on the surface. .. The antibacterial twisted yarn 20 produces a positive charge on the surface and a negative charge on the inside when an external force is applied.

The respective electric potentials generated on the surfaces of the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 tend to have the same electric potential in the vicinity of the surfaces. In response to this, the electric potential inside the yarn changes to try to maintain the electric potential difference between the surface and the inside of the yarn. Therefore, the antibacterial twisted yarn 10 or the antibacterial twisted yarn 20 generates an electric field due to the potential difference caused by this electric charge. In each yarn, an electric field formed between the inside and the surface of the yarn leaks into the air, the electric fields are coupled to each other, and a strong electric field is formed in the vicinity of the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20. It The potential generated on the antibacterial twisted yarn 10 or the antibacterial twisted yarn 20 and the antibacterial twisted yarn 10 when the object is close to a predetermined potential such as a human body (including a ground potential). Creates an electric field between.

It is conventionally known that the growth of bacteria and fungi can be suppressed by an electric field (see, for example, Tetsuaki Doto, Hironori Koryo, Hideaki Matsuoka, Junichi Koizumi, Kodansha: Microbial Control-Science and Engineering). See, for example, Koichi Takagi, Application of High Voltage/Plasma Technology to Agricultural/Food Field, J.HTSJ, Vol.51, No.216). In addition, the electric potential that causes the electric field may cause a current to flow through a current path formed by moisture or the like or a circuit formed by a local micro discharge phenomenon or the like. It is considered that this current weakens the bacteria and suppresses the growth of the bacteria. The bacterium referred to in the present embodiment includes bacteria, fungi or microorganisms such as mites and fleas.

Therefore, the antibacterial effect is directly exerted by an electric field formed in the vicinity of the antibacterial twisted yarn 10 or an electric field generated when the object is close to an object having a predetermined potential such as a human body. Alternatively, the antibacterial twisted yarn 10 causes an electric current to flow when it approaches another fiber having a predetermined potential, such as another fiber or a human body, which is in close proximity, through moisture such as sweat. This current may also directly exert an antibacterial effect. Alternatively, active oxygen species in which oxygen contained in water is changed by the action of electric current or voltage, radical species produced by interaction with the additive contained in the fiber or catalytic action, or other antibacterial chemical species (amine Derivatives etc.) may indirectly exert an antibacterial effect. Alternatively, a stress environment due to the presence of an electric field or an electric current may generate oxygen radicals in the cells of the bacterium, which may cause the antibacterial twisted yarn 10 to indirectly exert an antibacterial effect. As a radical, generation of a superoxide anion radical (active oxygen) or a hydroxy radical is considered. The “antibacterial” referred to in the present embodiment is a concept including both the effect of suppressing the generation of bacteria and the effect of killing the bacteria. Further, the antibacterial twisted yarn 20 also directly or indirectly exerts an antibacterial effect, like the antibacterial twisted yarn 10. Hereinafter, in the present embodiment, the antibacterial twisted yarn 20 is the same as the antibacterial twisted yarn 10, so only the antibacterial twisted yarn 10 will be described.

Since the short fibers 12 are shorter than the long fibers 11, when the short fibers 12 are twisted together with the long fibers 11, the short fibers 12 are more likely to be swung along a random direction than the long fibers 11. That is, as shown in FIG. 1(A), the short fibers 12 form a random angle with respect to the axial direction 101.

　A string-like object such as a fiber has the smallest cross-sectional area when cut perpendicular to the axial direction, and the cross-sectional area increases as the cut surface approaches the axial direction. As shown in FIG. 1(B), in the cross section of the antibacterial twisted yarn 10, the cross-sectional areas of the long fibers 11 are relatively uniform, and the cross-sectional areas of the short fibers 12 are various. For example, the cross-sectional area of the short fibers 122 is larger than the cross-sectional area of the long fibers 11. This is because the short fibers 122 form an angle of 45 degrees or more with the axial direction 101.

In the antibacterial twisted yarn 10, all the long fibers 11 and the short fibers 12 are not swung along a predetermined direction. Therefore, the voids 41 are likely to occur between the long fibers 11 and the short fibers 12 or between the long fibers 11 and the short fibers 12. Since the antibacterial twisted yarn 10 has many voids 41 between the respective fibers, the electric field generated by the long fibers 11 easily leaks to the outside of the antibacterial twisted yarn 10. Thereby, the antibacterial effect of the antibacterial twisted yarn 10 is improved. Note that the antibacterial effect is exhibited in the voids 41 formed between the fibers of the antibacterial twisted yarn 10 regardless of the presence or absence of water.

FIG. 4 is a cross-sectional view schematically showing a part of the antibacterial twisted yarn 10 for explaining the antibacterial mechanism of the antibacterial twisted yarn 10. As shown in FIG. 4, the antibacterial twisted yarn 10 can absorb water near the antibacterial twisted yarn 10 in the voids 41 formed between the long fibers 11 or the short fibers 12. The microparticles 42 such as bacteria absorbed by the antibacterial twisted yarn 10 together with the water are easily retained inside the antibacterial twisted yarn 10. Further, the larger the voids 41 inside the antibacterial twisted yarn 10, the more the amount of water that can be absorbed increases, so that the number of fine particles 42 retained inside the antibacterial twisted yarn 10 also increases. As a result, the antibacterial twisted yarn 10 is excellent in the performance of collecting the fine particles 42. Further, the long fibers 11 give a local and maximum electric field to the fine particles 42 held and diffused inside the antibacterial twisted yarn 10. Therefore, the antibacterial twisted yarn 10 can efficiently generate an antibacterial effect against bacteria or the like adsorbed by the electric charge generated by the long fibers 11.

The antibacterial twisted yarn 10 also includes a plurality of short fibers 12. Since the short fibers 12 are shorter than the long fibers 11, each short fiber 12 exists only in a part of the antibacterial twisted yarn 10 in the axial direction. In general, each short fiber 12 is interrupted in the antibacterial twisted yarn 10 in the axial direction of the antibacterial twisted yarn 10. The end portion of the short fiber 12 (for example, the tip 121 shown in FIGS. 1A and 1B) is exposed from the side surface of the antibacterial twisted yarn 10 to the surroundings. Since the ends of many short fibers 12 are exposed on the side surface of the antibacterial twisted yarn 10, the side surface of the antibacterial twisted yarn 10 has a so-called fluffy structure. As a result, the antibacterial twisted yarn 10 can have variations in touch and appearance. Further, since the surface area of the antibacterial twisted yarn 10 increases due to fluffing, moisture and fine particles are easily adsorbed on the side surface of the antibacterial twisted yarn 10. As a result, the antibacterial twisted yarn 10 is excellent in the ability to collect fine particles, and can efficiently generate an antibacterial effect against bacteria and the like adsorbed by the charges generated by the long fibers 11.

The ordinary fiber, which is the material of the short fiber 12, is preferably made of a material having higher hydrophilicity than the piezoelectric fiber, which is the long fiber 11. That is, the short fibers 12 are made of a material having higher hydrophilicity than PLLA. For this reason, the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 have higher hydrophilicity than fibers made of only PLLA. When the hydrophilicity of the antibacterial twisted yarn 10 becomes high, water easily penetrates into the antibacterial twisted yarn 10. Therefore, the collection performance of the antibacterial twisted yarn 10 is enhanced, and it becomes easy to adsorb water and fine particles to the side surface of the antibacterial twisted yarn 10 and the voids 41.

Further, when the hydrophilicity of the antibacterial twisted yarn 10 becomes high, the water easily gets wet and spreads inside the antibacterial twisted yarn 10. The water spread over a wide range inside the antibacterial twisted yarn 10 has a large surface area and is easily vaporized. It is generally known that hydrophilic fiber aggregates have high drying properties. When water enters the voids 41 of the antibacterial twisted yarn 10, the antibacterial twisted yarn 10 swells. On the contrary, when water is vaporized and discharged from the void 41 of the antibacterial twisted yarn 10, the antibacterial twisted yarn 10 contracts. When the antibacterial twisted yarn 10 swells or contracts, the long fibers 11 inside the antibacterial twisted yarn 10 expand and contract. Since the long fibers 11 expand and contract, a local high electric field space is generated inside the antibacterial twisted yarn 10. The bacteria taken inside the antibacterial twisted yarn 10 die or are deactivated in the high electric field space. Therefore, the antibacterial twisted yarn 10 has an excellent performance of collecting fine particles, and can efficiently generate an antibacterial effect against bacteria and the like adsorbed by the charges generated by the long fibers 11.

The thicknesses of the long fibers 11 and the short fibers 12 may be the same or different. Moreover, the thickness of the long fiber 11 does not necessarily need to be uniform, and the thickness of the short fiber 12 does not necessarily have to be uniform.

Note that as the thread that produces a negative charge on the surface, in addition to the S thread using PLLA, the Z thread using PDLA can be considered. Further, as the thread that produces a positive charge on the surface, in addition to the Z thread using PLLA, an S thread using PDLA can be considered.

Hereinafter, the antibacterial twisted yarn 50 according to the second embodiment will be described. FIG. 5: is a figure which shows the structure of the antibacterial twisted yarn 50 which concerns on 2nd Embodiment. In the description of the antibacterial twisted yarn 50, only the points different from the first embodiment will be described, and the description of the same points will be omitted.

As shown in FIG. 5, the antibacterial twisted yarn 50 includes short fibers 52. The short fibers 52 are piezoelectric fibers that generate an electric charge by expansion and contraction. In the antibacterial twisted yarn 50, the short fibers 52 are turned along a random direction with respect to the turning direction of the long fibers 11.

The drawing direction 900 of the long fiber 11 is in a state of being inclined to the right with respect to the axial direction 101 of the antibacterial twisted yarn 50. On the other hand, the drawing direction 901 of the short fiber 52 is in a state of being tilted to the left with respect to the axial direction 101 of the antibacterial twisted yarn 50. Therefore, when the external force (tension) is applied to the antibacterial twisted yarn 50, the long fiber 11 becomes in the state shown in FIG. 2A, and a negative charge is generated on the surface. The short fibers 52 are in the state shown in FIG. 2(B), and a positive charge is generated on the surface.

A positive charge and a negative charge are generated in the antibacterial twisted yarn 50. Therefore, a relatively strong electric field can be generated between the long fibers 11 and the short fibers 52. When the long fibers 11 and the short fibers 52 are brought close to each other, these electric fields leak out into the air and are coupled, and an electric field is formed between the long fibers 11 and the short fibers 52. That is, the potential difference at each place is defined by an electric field formed by fibers intricately intertwined with each other, or a circuit formed by a current path that is accidentally formed in the yarn by moisture or the like.

Hereinafter, the antibacterial twisted yarn 60 according to the third embodiment will be described. FIG. 6(A) is a diagram showing the structure of the antibacterial twisted yarn 60 according to the third embodiment, and FIG. 6(B) is a sectional view taken along line III-III of FIG. 6(A). In the description of the antibacterial twisted yarn 60, only differences from the antibacterial twisted yarn 10 of the first embodiment will be described, and description of the same points will be omitted.

As shown in FIGS. 6(A) and 6(B), the antibacterial twisted yarn 60 includes short fibers 62. The short fiber 62 is a twisted yarn composed of a plurality of fibers 63, and is a left-handed yarn obtained by twisting the fiber 63 leftward. The fiber 63 is a piezoelectric fiber that generates an electric charge by expansion and contraction. The drawing direction 903 of the fiber 63 is in a state of being tilted to the left with respect to the axial direction of the fiber 63. The fibers 63 are along random directions. Therefore, the drawing direction 903 of the fiber 63 is in a state of being inclined in various directions with respect to the axial direction 101 of the antibacterial twisted yarn 60. Since a part of the fiber 63 is tilted to the right with respect to the axial direction 101 of the antibacterial twisted yarn 60, the fiber 63 produces a positive charge on the surface when stretched. Therefore, a relatively strong electric field can be generated between the long fibers 11 and the fibers 63.

The short fiber 62 is not limited to a plurality of piezoelectric fibers twisted together, and may be a core yarn or a covering yarn in which a piezoelectric film is wound in a space serving as an axial core. The same effect can be obtained also by this. In this case, the core yarn is not an essential component. It is possible to spirally turn a piezoelectric film into a piezoelectric fiber (turning thread) without a core thread. When there is no core yarn, the swirling yarn becomes a hollow fiber, and the heat retaining ability is improved. Further, the strength can be increased by impregnating the turning yarn itself with an adhesive. Further, as the long fiber 11, a core yarn or a covering yarn in which a piezoelectric film is wound in a space serving as an axis may be used.

The antibacterial thread 70 will be described below. FIG. 7 is a partially exploded view showing the structure of the antibacterial thread 70.

As shown in FIG. 7, the antibacterial yarn 70 includes the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20. The antibacterial yarn 70 is a yarn (Z yarn) in which the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 are twisted counterclockwise with respect to each other. In the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 of the first embodiment, the drawing direction 900 of the long fiber 11 is inclined by 45 degrees with respect to the respective axial directions 101, but the antibacterial yarn 70 is the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20. Twisted. By adjusting the number of twists of the antibacterial twisted yarn 10, the antibacterial twisted yarn 20, and the antibacterial yarn 70, the stretching direction 900 of each long fiber 11 is finally adjusted to be inclined by 45 degrees with respect to the axial direction 102 of the antibacterial yarn 70. it can.

The antibacterial twisted yarn 20 is a Z yarn using PLLA, but the antibacterial twisted yarn 20 may be an S yarn using PDLA. Since the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 are the same S yarn, it becomes easy to adjust the angle between the yarns when manufacturing the antibacterial yarn 70.

The antibacterial yarn 70 is formed by intersecting the antibacterial twisted yarn 10 having a negative electric charge on the surface and the antibacterial twisted yarn 20 having a positive electric charge on the surface, so that an electric field can be generated by the yarn alone. In each of the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20, the electric field formed between the inside and the surface of the yarn leaks into the air. The electric fields generated by the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 are coupled to each other. A strong electric field is formed in the vicinity of the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20. Thereby, the antibacterial thread 70 has an antibacterial effect.

The twisted yarn structure is complicated, and the locations where the antibacterial twisted yarn 10 and the antimicrobial twisted yarn 20 are close to each other are not uniform. Further, when tension is applied to the antibacterial twisted yarn 10 or the antibacterial twisted yarn 20, the adjacent portion also changes. As a result, there is a change in the strength of the electric field in each part, and an electric field whose symmetry is broken is generated. A yarn (S yarn) in which the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 are twisted by rotating rightward with respect to each other (S yarn) can similarly generate an electric field by the yarn alone. The number of twists of the antibacterial twisted yarn 10, the number of twists of the antibacterial twisted yarn 20, or the number of twists of the antibacterial yarn 70 obtained by twisting these yarns is determined in view of the antibacterial effect.

Hereinafter, the antibacterial cloth 80 will be described. FIG. 8 is a diagram showing the configuration of the antibacterial cloth 80.

As shown in FIG. 8, the antibacterial cloth 80 includes a plurality of antibacterial twisted yarns 10 and a plurality of antibacterial twisted yarns 20. In the antibacterial cloth 80, the portions other than the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 are non-piezoelectric fibers. Here, the non-piezoelectric fiber includes a material that does not generate an electric charge and is made of a natural fiber such as cotton or wool generally used as a thread or a synthetic fiber. The non-piezoelectric fibers may include those that generate a weaker electric charge than the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20. In the antibacterial cloth 80, the antibacterial twisted yarns 10 and the antibacterial twisted yarns 20 are woven together with the non-piezoelectric fibers in a state of being arranged alternately in parallel.

In the antibacterial cloth 80, the warp is the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20, and the non-piezoelectric fiber, and the weft is a non-piezoelectric fiber. It is not always necessary to weave non-piezoelectric fibers into the warp, and only the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 may be used. The weft yarn is not limited to the non-piezoelectric fiber, and may include the antibacterial twisted yarn 10 or the antibacterial twisted yarn 20.

When the antibacterial cloth 80 is stretched in a direction parallel to the warp, electric charges are generated from the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20. In each of the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20, the electric field formed between the inside and the surface of the yarn leaks into the air. The electric fields generated by the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 are coupled to each other. A strong electric field is formed in the vicinity of the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20. As a result, the antibacterial cloth 80 has an antibacterial effect.

Note that the antibacterial cloth 80 is not limited to fabric. Examples of the antibacterial cloth 80 include a knitted fabric in which the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20 are knitted, and a nonwoven fabric including the antibacterial twisted yarn 10 and the antibacterial twisted yarn 20.

The antibacterial twisted yarn 10, the antibacterial twisted yarn 20, the antibacterial twisted yarn 50, the antibacterial twisted yarn 60, the antibacterial yarn 70, or the antibacterial cloth 80 as described above can be applied to various kinds of clothing or products such as medical materials. For example, the antibacterial twisted yarn 10, the antibacterial twisted yarn 20, the antibacterial twisted yarn 60, the antibacterial twisted yarn 60, the antibacterial yarn 70, or the antibacterial cloth 80 is used as an insole of a mask, underwear (particularly socks), towel, shoes and boots, general sportswear, a hat. , Bedding (including futons, mattresses, sheets, pillows, pillowcases, etc.), toothbrush, floss, water purifier, filters for air conditioners or air purifiers, stuffed animals, pet related products (pet mats, pet clothes, pets) Inner clothing, various mats (feet, hands, toilet seats, etc.), curtains, kitchen utensils (sponge, cloth, etc.), seats (seats for cars, trains, airplanes, etc.), cushioning materials for motorcycle helmets, and the like. Exterior materials, sofas, bandages, gauze, sutures, clothes for doctors and patients, supporters, sanitary goods, sports equipment (inners for wear and gloves, or baskets used in martial arts), air conditioners or air purifiers, etc. It can be applied to filters, packaging materials, screen doors, and the like.

Finally, the description of the present embodiment should be considered as illustrative in all points and not restrictive. The scope of the invention is indicated by the claims rather than the embodiments described above. Further, the scope of the present invention is intended to include meanings equivalent to the claims and all modifications within the scope.

10, 20, 50, 60... Antibacterial twisted yarn 11... Long fiber 12... Short fiber 70... Antibacterial yarn 80... Antibacterial cloth

Claims (9)

Long fibers made of piezoelectric fibers or ordinary fibers that generate electric charge by external energy,
When the long fiber is made of ordinary fiber, it is made of piezoelectric fiber, and when the long fiber is made of piezoelectric fiber, it is provided with piezoelectric fiber or short fiber made of ordinary fiber,
Antibacterial twisted yarn. The long fibers are piezoelectric fibers,
The short fibers are ordinary fibers,
The antibacterial twisted yarn according to claim 1. The ordinary fiber is made of a material having higher hydrophilicity than the piezoelectric fiber,
The antibacterial twisted yarn according to claim 1 or 2. The long fibers and the short fibers are piezoelectric fibers,
The antibacterial twisted yarn according to claim 1. The piezoelectric fiber includes a chiral polymer,
The antibacterial twisted yarn according to any one of claims 1 to 4. The chiral polymer is polylactic acid,
The antibacterial twisted yarn according to claim 5. The long fibers rotate at a predetermined angle with respect to the axial direction of the antibacterial twisted yarn,
The antibacterial twisted yarn according to any one of claims 1 to 6. A plurality of antibacterial twisted yarns according to any one of claims 1 to 7,
The antibacterial twisted yarn includes a first antibacterial twisted yarn and a second antibacterial twisted yarn,
The polarities of electric charges generated in the first antibacterial twisted yarn and the second antibacterial twisted yarn are different from each other,
Antibacterial thread. An antibacterial twisted yarn according to any one of claims 1 to 7,
Antibacterial cloth.

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