JP7147999B2 - thread - Google Patents

Description

The present invention relates to a yarn made by twisting different fibers.

BACKGROUND ART In recent years, in order to realize a comfortable and healthy lifestyle, various lifestyle products with improved comfort, health, or hygiene have been devised. In particular, garments made of fibers with antibacterial properties are devised. Antibacterial fibers are, for example, charge-generating fibers that exhibit antibacterial properties due to charges generated by the piezoelectric effect. Piezoelectric yarns disclosed in US Pat. When tension is applied to the piezoelectric yarn, an electric charge is generated on the surface of the piezoelectric yarn, and an electric field is generated in the spaces formed between the fibers due to the electric charge. Piezoelectric yarn exhibits antibacterial and other effects due to the generated electric field.

WO2017/212836

Conventional charge-generating fibers have room for improvement in terms of confining bacteria in the vicinity of the space where an electric field is generated.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a yarn having a better antibacterial effect than conventional antibacterial charge-generating yarns.

The yarn of the present invention comprises a first fiber having at least one groove extending longitudinally and at least one second fiber in which an electric potential is generated by external energy. The yarn is characterized in that the second fibers are arranged in the region formed in the grooves of the first fibers, and spaces are formed between the first fibers and the second fibers.

In the yarn of the present invention, the second fiber is arranged in the region formed in the groove of the first fiber, and a space is formed between the first fiber and the second fiber, so an electric field is applied to this space. can be generated. In addition, since the grooves are formed in the first fibers, the surface area of the first fibers is increased, making it easier for bacteria to adhere to the first fibers. As a result, the yarn composed of the first fibers and the second fibers exhibits a good antibacterial effect.

According to this invention, it is possible to realize a yarn that creates a space in which a good electric field is generated.

FIG. 1(A) is a diagram showing the structure of a thread according to one embodiment of the present invention. FIG. 1(B) is a cross-sectional view taken along line II of FIG. 1(A). FIG. 1C is a diagram illustrating twisting the first and second fibers of the yarn. FIGS. 2A to 2C are diagrams showing cross-sectional shapes of the first fibers, respectively. 3A and 3B show the relationship between the deformation of the second fiber, the uniaxial drawing direction, and the electric field direction when the second fiber is uniaxially drawn polylactic acid (PLLA). It is a figure which shows. FIG. 4(A) is a diagram showing the construction of a thread according to one embodiment of the present invention. FIG. 4(B) is a cross-sectional view taken along line II--II of FIG. 4(A). FIG. 4(C) illustrates twisting the first and second fibers of the yarn. FIG. 5 is a diagram showing the electric field in yarn. FIG. 6 is a cross-sectional view of a thread according to one embodiment of the invention. FIG. 7 is a cross-sectional view of a thread according to one embodiment of the invention.

FIG. 1(A) is a diagram showing the configuration of a thread 1 according to one embodiment of the present invention. FIG. 1(B) is a cross-sectional view taken along line II of FIG. 1(A). FIG. 1(C) is a diagram showing twisting of the first fibers 10 and the second fibers 20 of the yarn 1. FIG.

The yarn 1 is composed of first fibers 10 and second fibers 20 . The first fiber 10 has at least one longitudinal groove 12 and is surrounded by a plurality of second fibers 20 . The second fibers 20 generate an electric charge when energy is applied. In the yarn 1 of this embodiment, the second fibers 20 are aligned with the grooves 12 of the first fibers 10 and twisted together with the first fibers 10 . Note that FIG. 1B shows, as an example, the cross section of one first fiber 10 and six second fibers 20 in the cross section taken along the line II, but the number of first fibers 10 And the number of the second fibers 20 is not limited to this, and is actually set as appropriate in consideration of the application and the like.

Conventionally, it is known that the growth and transfer of bacteria and fungi can be suppressed by an electric field (see, for example, Tetsuaki Tsuchito, Hiroki Korai, Hideaki Matsuoka, Junichi Koizumi, Kodansha: Control of Microorganisms-Science and Engineering. Also See, for example, Koichi Takagi, Application of high voltage/plasma technology to agricultural and food fields, J.HTSJ, Vol.51, No.216). In addition, due to the potential that generates this electric field, current may flow through a current path formed by moisture or the like, or a circuit formed by a microdischarge phenomenon or the like. It is conceivable that this current weakens the bacteria and suppresses their growth and transfer.

When the yarn 1 of this embodiment receives energy from the outside (for example, when tension is applied in the axial direction of the yarn 1), an electric charge is generated and an electric field is generated. Alternatively, when the thread 1 receiving energy from the outside is brought close to an object having a predetermined potential (including ground potential) such as a human body, an electric field is also generated between the thread 1 and the object. In addition, when receiving energy from the outside and the thread 1 comes close to an object having a predetermined potential (including ground potential) such as a human body, liquid such as sweat is interposed between the thread 1 of the present invention and the object. current flows.

Destruction of bacterial cells and cytoplasmic denaturation by electric fields or currents occur. As a result, the cell of the fungus or the electron transport system for sustaining the life of the fungus is disturbed, and the fungus is killed or the fungus itself is weakened. Also, oxygen contained in liquids such as sweat and water may be changed into reactive oxygen species by an electric field or electric current. Reactive oxygen species include oxygen radicals, the action of which kills or weakens bacteria. Thus, yarn 1 has a pronounced antibacterial effect. In the present invention, the term "antibacterial effect" is a concept that includes both the effect of killing bacteria and the effect of weakening bacteria.

In this embodiment, the first fiber 10 is a modified cross-section fiber (deformed filament) made of a fiber material such as polyester, nylon, or acrylic. FIGS. 2(A) to 2(C) are diagrams showing cross-sectional shapes of the first fibers 10, respectively. As shown in FIGS. 2(A) to 2(C), the cross-sectional shape of the first fiber 10 is a cross, a star-shaped polygon, or a concave polygon. In either example, the first fiber 10 has grooves 12 and projections 14 extending longitudinally.

Furthermore, in this embodiment, the second fibers 20 are made of, for example, a piezoelectric polymer. Examples of piezoelectric polymers include polyvinylidene fluoride (PVDF) and polylactic acid (PLA), both of which can be used as raw materials for the second fibers 20 . Among them, polylactic acid (PLA) is a piezoelectric polymer without pyroelectric properties. Polylactic acid produces piezoelectricity by being uniaxially stretched. Polylactic acid includes PLLA, which has a right-handed helical structure in which L-body monomers are polymerized, and PDLA, which has a left-handed helical structure in which D-body monomers are polymerized and whose piezoelectric constant has a polarity opposite to that of PLLA.

FIGS. 3(A) and 3(B) show the deformation, uniaxial stretching direction, electric field direction, and It is a figure which shows the relationship of. 3(A) and 3(B) are diagrams assuming that the second fibers 20 have a film shape as a model case. In this embodiment, the second fibers 20 are circular cross-section fibers (circular filaments).

Polylactic acid (PLA) is a chiral polymer and has a helical structure in its main chain. When polylactic acid is uniaxially stretched and the molecules are oriented, piezoelectricity appears. Further, if heat treatment is applied to increase the degree of crystallinity, the piezoelectric constant will increase. When the thickness direction of the second fiber 20 made of uniaxially drawn polylactic acid is defined as the first axis, the drawing direction 900 is defined as the third axis, and the direction perpendicular to both the first and third axes is defined as the second axis. , with tensor components of _d14 and _d25 as piezoelectric strain constants. Therefore, the second fiber 20 made of uniaxially stretched polylactic acid generates an electric charge when it is distorted in a direction of 45 degrees with respect to the uniaxially stretched direction.

As shown in FIG. 3A, when the second fibers 20 contract in the direction of the first diagonal line 910A and extend in the direction of the second diagonal line 910B perpendicular to the first diagonal line 910A, the produce an electric field. That is, in the state of FIG. 3A, negative charges are generated on the front side of the paper. Also, as shown in FIG. 3B, electric charges are generated when the second fibers 20 extend in the direction of the first diagonal line 910A and contract in the direction of the second diagonal line 910B. In this case, the polarity is reversed, creating an electric field in the direction from the front side to the back side of the paper. That is, in the state of FIG. 3B, positive charges are generated on the front side of the paper.

In polylactic acid, orientation of molecules by stretching produces piezoelectricity, so poling is not required unlike other piezoelectric polymers such as PVDF or piezoelectric ceramics. Uniaxially stretched polylactic acid has a piezoelectric constant of about 5 to 30 pC/N, 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.

As shown in FIG. 1(C), the yarn 1 is obtained by twisting the second fibers 20 having the above-described properties together with the first fibers 10 in a counterclockwise direction. Here, yarn 1 is S-twisted (right-twisted). In FIG. 1A, since the plurality of second fibers 20 are twisted, the drawing direction (longitudinal direction) 900 of each second fiber 20 is inclined with respect to the drawing direction of the yarn 1 . In other words, the drawing direction 900 of the second fibers 20 is inclined to the left on the paper surface with respect to the drawing direction of the yarn 1 .

Ideally, the angle between the drawing direction 900 of the second fiber 20 and the drawing direction of the yarn 1 (twist angle of the second fiber 20) is 45 degrees. When the yarn 1 is stretched by applying tension, the second fibers 20 are elongated along the axial direction of the yarn 1 and contracted along the width direction of the yarn 1 . Therefore, the axial direction of the thread 1 corresponds to the second diagonal line 910B shown in FIG. 3(A), and the width direction of the thread 1 corresponds to the first diagonal line 910A shown in FIG. 3(A). As in the example shown in FIG. 3A, the second fibers 20 extend in the direction corresponding to the second diagonal line 910B and contract in the direction corresponding to the first diagonal line 910A. Therefore, a negative charge is generated on the surface of the second fiber 20 and a positive charge is generated inside. In other words, the second fibers 20 are charged with energy from the outside.

Of course, the inclination of the second fibers 20 with respect to the axial direction of the yarn 1 is not limited to 45 degrees to the left. When a shear stress is applied to the second fibers 20, an electric charge is generated. Therefore, the drawing direction 900 of the second fibers 20 may intersect at least the axial direction of the yarn 1 . Considering this, the twist angle of the second fibers 20 should be greater than 0 degrees and less than 90 degrees to the left. In general, the closer the twist angle of the second fibers 20 is to 45 degrees to the left, the more efficient the charge generation is. However, threads are usually used for applications such as knitting, weaving, and sewing, and the direction in which the threads are stretched may not be constant. In other words, the twist angle of the second fibers 20 is not limited to the above because the external force is not necessarily applied in the longitudinal direction of the yarn.

In the present embodiment, since the first fibers 10 have the grooves 12, the surface area of the first fibers 10 becomes larger than those without the grooves, and the possibility that bacteria adhere to the first fibers 10 is relatively high. Become. Further, as shown in FIG. 1C, when the first fibers 10 having grooves 12 in the longitudinal direction are twisted, the grooves 12 extend spirally. Further, the shape of the groove portion 12 is a shape that does not follow the surface of the second fiber 20 . With such a configuration, when the second fibers 20 are twisted, the second fibers 20 are twisted along the grooves 12 of the first fibers 10 . In other words, the second fibers 20 are twisted while being guided by the grooves 12 of the first fibers 10 . Here, the opening width of the groove portion 12 is substantially equal to the length of the diameter of the second fiber 20 or larger than the length of the diameter of the second fiber 20 . At this time, by increasing the coefficient of friction of one of the first fibers 10 or the second fibers 20, when the first fibers 10 and the second fibers 20 are stressed to each other, stress can be efficiently applied to the other. and can improve charge generation.

Furthermore, as shown in FIG. 1C, in the present embodiment, a space SP is formed between the groove portion 12 of the first fiber 10 and the second fiber 20 arranged in the region formed in the groove portion 12. formed. In FIG. 1C, the cross section of the groove 12 is V-shaped, but the cross section of the second fiber 20 is circular. Therefore, since the second fiber 20 and the groove portion 12 are not completely meshed with each other, a space SP is generated. With such a space SP, a leakage electric field is likely to be formed. Therefore, the yarn 1 exhibits good antibacterial and other effects. Further, by changing the shape of the groove portion 12 of the first fiber 10, the shape of the space SP can be changed, and in combination with the second fiber 20, the optimal leakage electric field can be changed.

The cross-sectional area of the space SP is smaller than the cross-sectional area of the thread 1 . Also, the space SP may be smaller than the cross-sectional area of the first fiber 10 or smaller than the cross-sectional area of the second fiber 20 .

FIG. 4(A) is a diagram showing the configuration of the thread 2 according to one embodiment of the present invention. FIG. 4(B) is a cross-sectional view taken along line II--II of FIG. 4(A). FIG. 4(C) is a diagram showing that the first fibers 10 and the second fibers 20 of the yarn 2 are twisted. In the yarn 2 of this embodiment, the second fibers 20 are twisted to the right together with the first fibers 10 . That is, the yarn 2 is Z twisted (left twisted). In FIG. 4A, the drawing direction 900 of the second fibers 20 is inclined to the right on the paper surface with respect to the drawing direction of the yarn 2 .

Like the thread 1 described above, in the thread 2, the angle between the drawing direction 900 of the second fiber 20 and the drawing direction of the thread 2 should ideally be 45 degrees. When the yarn 2 is stretched by applying tension in the axial direction, the second fibers 20 are elongated along the axial direction of the yarn 2 and contracted along the width direction of the yarn 2 . Therefore, the drawing direction of the thread 2 corresponds to the first diagonal line 910A shown in FIG. 3B, and the width direction of the thread 2 corresponds to the second diagonal line 910B shown in FIG. 3B. Then, as in the example shown in FIG. 3B, the second fibers 20 extend in the direction corresponding to the first diagonal line 910A and contract in the direction corresponding to the second diagonal line 910B. Therefore, a positive charge is generated on the surface of the yarn 2 and a negative charge is generated on the inside.

In addition, since an electric charge is generated by applying shear stress to the second fiber 20, the inclination of the yarn 2 with respect to the drawing direction is not limited to 45 degrees to the right. Just do it. However, as the twist angle of the second fibers 20 approaches right 45 degrees, the efficiency of charge generation improves. In this embodiment, the groove portion 12 of the first fiber 10 is a V groove, and the surface of the second fiber 20 is arcuate. That is, the shape of the groove portion 12 of the first fiber 10 is a shape that does not follow the surface of the second fiber 20 . However, in other embodiments, the grooves 12 of the first fibers 10 may be shaped along the surfaces of the second fibers 20 . For example, the groove portion 12 of the first fiber 10 is a semi-circular groove, and the surface of the second fiber 20 is arcuate. Furthermore, threads are typically used for applications such as knitting, weaving, and sewing, and the direction in which the threads are stretched may not be constant. In other words, the twist angle of the second fibers 20 is not limited to the above because the external force is not necessarily applied in the longitudinal direction of the yarn.

Further, as shown in FIG. 4C, since there is a space SP between the groove portion 12 of the first fiber 10 and the second fiber 20 arranged in alignment with the groove portion 12, a leakage electric field is formed. Cheap. Thus, yarn 2 has the same good antibacterial effect as yarn 1.

FIG. 5 is a diagram showing the electric field in Yarn 1 and Yarn 2. FIG. The yarn 1 alone has a negative potential on the surface and a positive potential on the inside when tension is applied. The yarn 2 alone has a positive potential on the surface and a negative potential on the inside when tension is applied. When yarn 1 and yarn 2 approach each other, the adjacent portions (surfaces) tend to have the same potential. In this case, the vicinity of yarn 1 and yarn 2 will be 0 V, and the positive potential inside yarn 1 will be even higher so as to maintain the original potential difference. Similarly, the negative potential inside thread 2 is even lower.

In the cross section of the yarn 1, an electric field is formed mainly from the inside to the outside of the yarn 1, and in the cross section of the yarn 2, an electric field is mainly produced from the outside to the inside. When Yarn 1 and Yarn 2 are brought into close proximity, these electric fields leak into the air and combine, and the potential difference between Yarn 1 and Yarn 2 forms an electric field as shown in FIG. Alternatively, when the thread 1 (or thread 2) and an object having a predetermined potential (including ground potential), such as a human body, are close to each other, between the thread 1 (or thread 2) and the adjacent object An electric field is produced.

Alternatively, current may flow through a current path formed by moisture between the yarns 1 and 2, or a circuit formed by a microscopic discharge phenomenon or the like. Even when the thread 1 or thread 2 and an object having a predetermined potential are brought close to each other, current may flow through a current path formed by moisture or the like, or a circuit formed by a microscopic discharge phenomenon or the like. be.

Also, yarn 1 and yarn 2 need not have potentials of opposite polarities. Even if yarn 1 and yarn 2 have potentials of the same polarity, an electric field or current will be generated if there is a potential difference between them. That is, the yarn 1 and the yarn 2 should have different potentials when an electric charge is generated.

In addition to the S yarn using PLLA, the Z yarn using PDLA can also be considered as the fiber that generates a negative charge on the surface. In addition to the Z yarn using PLLA, the S yarn using PDLA can also be considered as the fiber that generates a positive charge on the surface.

In the embodiments described above, only the second fibers 20 contain polylactic acid. However, in other embodiments, the first fibers 10 may also contain polylactic acid. Then, an electric charge is generated when the first fibers 10 are twisted.

In the embodiments described above, the number of first fibers 10 in yarn 1 or yarn 2 is one, but in other embodiments the number of first fibers 10 may be more than one. FIG. 6 is a cross-sectional view of a thread according to one embodiment of the invention. As shown in FIG. 6 , a plurality of first fibers 10 are arranged so as to be surrounded by second fibers 20 . A bundle of first fibers 10 has more grooves 12 than a single first fiber 10 . With such a configuration, when the first fibers 10 and the second fibers 20 are twisted, the bundle of the first fibers 10 can guide more of the second fibers 20 .

In the embodiment described above, the first fibers 10 and the second fibers 20 are long fibers (filaments), and the yarns 1 and 2 are twisted yarns of long fibers. However, the yarns 1 and 2 are not limited to twisted yarns of long fibers. In another embodiment, the first fibers 10 and the second fibers 20 are staple fibers (spun), and the yarns 1 and 2 may be spun yarns of staple fibers. In another embodiment, the first fibers 10 and the second fibers 20 may be long fibers and short fibers (or short fibers and long fibers), respectively, and the yarns 1 and 2 may be twisted yarns of two types of fibers.

In the embodiments described above, the first fibers 10 are modified cross-section fibers (deformed filaments) and the second fibers 20 are circular cross-section fibers (circular filaments). However, the second fibers 20 are not limited to circular cross-section fibers. In another embodiment, second fibers 20 are modified cross-section fibers like first fibers 10 .

Also, in other embodiments, both the first fibers 10 and the second fibers 20 may be charge-generating fibers that generate charges. Furthermore, if both the first fibers 10 and the second fibers 20 are charge-generating fibers, one of them may have a lower elastic modulus than the other, and only one of the first fibers 10 or the second fibers 20 may is a charge-generating fiber, the elastic modulus of the other may be lower than the elastic modulus of the other. In this case, the fibers having a low elastic modulus tend to stretch the yarn, and shear stress is likely to be applied to the charge-generating fibers. Furthermore, when both the first fibers 10 and the second fibers 20 are charge-generating fibers, one of them may have a lower static friction coefficient than the other. If only one is a charge generating fiber, the other may have a higher static friction coefficient. In this case, shear stress is likely to be applied to the charge-generating fibers.

FIG. 7 is a cross-sectional view of a thread 3 according to one embodiment of the invention. In this embodiment, the thread 3 consists of first fibers 10 and second fibers 20 which are modified cross-section fibers, the first fibers 10 and the second fibers 20 having the same cross-sectional shape. However, in other embodiments, the first fibers 10 and the second fibers 20 in the yarn 3 may have different cross-sectional shapes.

As shown in FIG. 7, the second fiber 20 has at least one protrusion 24 extending longitudinally. The second fibers 20 are arranged so that the projections 24 of the second fibers 20 mesh with the grooves 12 of the first fibers 10 . In such a configuration, when the second fibers 20 are twisted, the protrusions 24 of the second fibers 20 are twisted along the grooves 12 of the first fibers 10 and extend spirally. That is, the second fibers 20 are twisted while being guided by the grooves 12 of the first fibers 10 .

The yarn 3 is S-twisted or Z-twisted depending on the twisting direction. In the present embodiment, the grooves 12 of the first fibers 10 and the protrusions 24 of the second fibers 20 are used to bring the twist angle of the second fibers 20 closer to the desired angle (45 degrees left or 45 degrees right). It is also possible to make the yarn 3 a medium-twisted yarn or a hard-twisted yarn. Further, since the shape and size of the internal space of the groove 12 do not completely match the shape and size of the protrusion 24, a space SP exists between the first fibers 10 and the second fibers 20. Therefore, a leakage electric field is likely to be formed. Such yarn 3 has the same good antibacterial effect as yarn 1 and yarn 2.

In the embodiment described above, the grooves 12 of the first fibers 10 are parallel to the longitudinal direction of the first fibers 10 as shown in FIG. 1(C). However, the grooves 12 are not limited to straight grooves. In another embodiment, the grooves 12 of the first fibers 10 are grooves spirally formed in the axial direction of the first fibers 10 . Winding the second fiber 20 along the helical groove results in a yarn that has an appearance similar to that of a twisted yarn. In this embodiment, the first fibers 10 need not be twisted. Also, the number of turns and the spiral angle of the second fiber 20 are determined by the installation state of the spiral groove. Therefore, if there is an appropriate number of turns and helix angle, the yarn obtained in this embodiment can also exhibit a good antibacterial effect.

The threads described above (thread 1, thread 2, thread 3, etc.) can be applied to daily products such as medical parts and clothing. For example, the above threads (thread 1, thread 2, or thread 3, etc.) can be used for masks, underwear (especially socks), towels, insoles such as shoes and boots, sportswear in general, hats, bedding (futons, mattresses, sheets, pillows, pillow covers, etc.), toothbrushes, floss, water purifiers, filters for air conditioners or air purifiers, etc., plush toys, pet-related products (pet mats, pet clothes, pet clothes innerwear), various mat products (feet, hand, toilet seat, etc.), curtains, kitchen utensils (sponge or cloth, etc.), sheets (seats for cars, trains, airplanes, etc.), cushioning materials for motorcycle helmets and their exterior materials, sofas, bandages, gauze, sutures, Applicable to clothes for doctors and patients, supporters, sanitary goods, sporting goods (wear and glove innerwear, gauntlets used in martial arts, etc.), filters for air conditioners or air purifiers, packaging materials, screen doors, etc. can be done.

Among clothes, socks (or supporters), in particular, inevitably expand and contract along the joints due to movement such as walking, so the above-mentioned threads (thread 1, thread 2, thread 3, etc.) frequently generate electric charges. do. In addition, socks absorb moisture such as sweat and become a breeding ground for the growth of bacteria. A remarkable effect is produced as a bacteria countermeasure application for.

Finally, the description of this embodiment should be considered as illustrative in all respects and not restrictive. The scope of the invention is indicated by the claims rather than the above-described embodiments. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and range of equivalents of the claims.

1, 2, 3 Thread 10 First fiber 20 Second fiber 12 Grooves 14, 24 Projection SP Space 900 Stretching direction 910A First diagonal 910B Second diagonal

Claims (11)

a first fiber having at least one groove extending longitudinally;
at least one second fiber in which an electric potential is generated by external energy;
The second fiber is arranged in the region formed in the groove of the first fiber,
A thread, wherein a space is formed between the groove portion of the first fiber and the second fiber arranged in alignment with the groove portion. 2. The yarn of claim 1, wherein the cross-sectional area of the spaces formed between the first fibers and the second fibers is smaller than the cross-sectional area of the yarn. The yarn according to claim 1 or 2, wherein the cross-sectional shape of the groove of the first fiber is a semicircle, and the cross-sectional shape of the second fiber is an arc. The yarn according to claim 1 or 2, wherein the cross section of the groove of the first fiber has a V-shaped outer periphery, and the second fiber has an arc-shaped cross section. The first fiber and the second fiber are modified cross-section fibers, and the second fiber has at least one protrusion extending in the longitudinal direction, the protrusion meshing with the groove of the first fiber. 3. A yarn according to claim 1 or claim 2, wherein the second fibers are arranged so as to. 6. The yarn of any preceding claim, wherein the first fibers have a lower modulus than the second fibers. 7. The yarn according to any one of claims 1 to 6 , wherein the opening width of the groove matches the length of the diameter of the second fiber. The yarn according to any one of claims 1 to 6 , wherein the opening width of the groove is larger than the length of the diameter of the second fiber. The second fiber contains polylactic acid,
A yarn according to any one of claims 1 to 8 . The first fiber or the second fiber is a long fiber,
A yarn according to any one of claims 1 to 9 . wherein the first fibers or the second fibers are staple fibers,
A yarn according to any one of claims 1 to 9 .

Images