Fiber product

Abstract

A fiber product provided with: a tungsten wire (10) having an elongation of 5% or more; and an organic fiber (20) combined with the tungsten wire (10).

Description

Technical Field

[0001] The present invention relates to fiber products. Background Art

[0002] Patent Document 1 discloses a metal fiber obtained by combining a tungsten wire having a roughened surface with an aromatic polyamide fiber or a nylon-based fiber.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-080413 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Tungsten wire generally has low ductility. Therefore, the tungsten wire may not be able to follow the expansion and contraction of the fiber and may break.

[0008] Therefore, an object of the present invention is to provide a fiber product capable of suppressing the occurrence of wire breakage of a tungsten wire.

[0009] Means for solving problems

[0010] A fiber product according to one embodiment of the present invention includes: a tungsten wire having an elongation of 5% or more; and an organic fiber combined with the tungsten wire.

[0011] Effects of the Invention

[0012] According to the fiber product of the present invention, it is possible to suppress the occurrence of wire breakage of the tungsten wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of twisted yarn according to the embodiment.

[0014] Figure 2 This is a flowchart showing a method for producing a tungsten wire included in a twisted yarn according to an embodiment.

[0015] Figure 3 It is a scatter diagram showing the relationship between the elongation and the tensile strength of the tungsten wires of the examples and comparative examples.

[0016] Figure 4 It is a schematic diagram showing the states of the twisted yarn before and after elongation according to the embodiment.

[0017] Figure 5 This is a graph showing the maximum value of elongation for each type of fiber that can be used as organic fiber.

[0018] Figure 6This is a diagram showing an example of Lp / Rp of a twisted yarn when a tungsten wire is wound around a plurality of organic fibers having different wire diameters by a predetermined number of times.

[0019] Figure 7 This is a graph showing the elongation Tw required for the tungsten wire when the elongation Tp of the organic fiber is in the range of 0% to 40%.

[0020] Figure 8 This is a graph showing the elongation Tw required for the tungsten wire when the elongation Tp of the organic fiber is in the range of 0% to 100%.

[0021] Fig. 9 It is a schematic diagram of a fiber product including twisted yarn according to an embodiment.

[0022] Fig.10 It is a diagram showing an outline of a winding test of a tungsten wire according to the embodiment.

[0023] Fig.11 This is a cross-sectional view of a metal mesh woven using tungsten wires and organic fibers according to an embodiment.

[0024] Fig. 12A This is a diagram showing the appearance of the tungsten wire of Example 16 after the winding test.

[0025] Fig. 12B Yes Fig. 12A A diagram obtained by enlarging a portion of .

[0026] Fig.13A It is a figure which shows the external appearance of the tungsten wire of Comparative Example 10 after the winding test.

[0027] Fig. 13B Yes Fig.13A A diagram obtained by enlarging a portion of . DETAILED DESCRIPTION

[0028] Hereinafter, the fiber products of the embodiments of the present invention are described in detail using the accompanying drawings. It should be noted that the embodiments described below are all embodiments representing a specific example of the present invention. Therefore, the numerical values, shapes, materials, constituent elements, configurations of constituent elements and connection forms, steps, and the order of steps shown in the following embodiments are examples, and the main purpose is not to limit the present invention. Therefore, the constituent elements not described in the independent claims among the constituent elements in the following embodiments are described as optional constituent elements.

[0029] In addition, each figure is a schematic diagram and may not be illustrated strictly. Therefore, for example, the scales in each figure may not be consistent. In addition, in each figure, the same symbols are marked for substantially the same structure, and repeated descriptions are omitted or simplified.

[0030] In the present specification, terms indicating the relationship between elements, terms indicating the shape of an element, and numerical ranges are not intended to have strict meanings but are intended to include substantially equivalent ranges, for example, differences of about several %.

[0031] (Implementation Method)

[0032] [Twisted yarn]

[0033] First, regarding the structure of the twisted yarn of this embodiment, use Figure 1 Provide explanation. Figure 1 It is a schematic diagram showing the twisted yarn 1 according to the present embodiment.

[0034] Twisted yarn 1 is an example of a fiber product. Figure 1 As shown in FIG. 1 , the twisted yarn 1 includes a tungsten wire 10 and an organic fiber 20 combined with the tungsten wire 10. The tungsten wire 10 and the organic fiber 20 constitute the twisted yarn 1.

[0035] In this embodiment, the twisted yarn 1 is a core-covered yarn having an organic fiber 20 as a core yarn and a tungsten wire 10 as a sheath yarn. For example, the twisted yarn 1 is manufactured by stretching and fixing the organic fiber 20 as a core yarn and winding the tungsten wire 10 as a sheath yarn around the organic fiber 20 (i.e., performing a covering process).

[0036] The tungsten wire 10 is wound along the outer side of the organic fiber 20 at a predetermined pitch. Figure 1 As shown in FIG. 1 , the tungsten wire 10 is spaced apart in each roll, but adjacent rolls may be closely connected.

[0037] The specific structure and manufacturing method of the tungsten wire 10 will be described below.

[0038] The organic fiber 20 is at least one fiber selected from synthetic fibers, natural fibers, and regenerated fibers. The organic fiber 20 is, for example, a synthetic fiber, such as an aromatic polyamide fiber or a nylon-based fiber. As the aromatic polyamide fiber, for example, a fiber made of an aromatic polyamide-based resin material such as Kevlar (registered trademark) can be used. As the nylon-based fiber, for example, a fiber made of an ultra-high molecular weight polyethylene such as Dyneema (registered trademark) can be used.

[0039] It should be noted that the chemical fibers used as the organic fiber 20 are not limited to the above ones, and other polyethylene, polyester, polypropylene, polyurethane, polyvinyl chloride, acrylic acid, etc. can be used. Alternatively, the organic fiber 20 can also be a semi-synthetic fiber or a regenerated fiber. In addition, the organic fiber 20 can also be a natural fiber such as a plant fiber or an animal fiber. For example, cotton, wool, silk, hemp, rayon, etc. can be used as the organic fiber 20.

[0040] exist Figure 1 In the example shown in FIG. 1 , the organic fiber 20 is a monofilament, but the invention is not limited thereto. The organic fiber 20 may be a multifilament, that is, an aggregate of a plurality of monofilaments. When the organic fiber 20 is a monofilament, the elongation of the organic fiber 20 is, for example, 70% or less.

[0041] It should be noted that the so-called elongation corresponds to the total elongation at break, which is measured by an extensometer. Specifically, the elongation of the organic fiber 20 is the total elongation at break of the organic fiber 20, which is a value obtained by summing the elastic elongation and the plastic elongation of the extensometer, expressed as a percentage relative to the distance of the elongometer mark. Simply put, the elongation represents the ratio of the difference between the length after elongation and the length before elongation to the length before elongation. When the elongation is a positive value, it means that the wire has been elongated, and when the elongation is a negative value, it means that the wire has shrunk. The same is true for the elongation of the tungsten wire 10.

[0042] In this embodiment, the diameter of the organic fiber 20 is larger than that of the tungsten wire 10 , for example, 100 μm or more, but not limited thereto. It should be noted that the diameter of the organic fiber 20 may be equal to or smaller than that of the tungsten wire 10 .

[0043] When the organic fiber 20 is a monofilament, the wire diameter of the organic fiber 20 is represented by the maximum width of the cross section of one filament (a cross section orthogonal to the axial direction). When the organic fiber 20 is a multifilament, the wire diameter of the organic fiber 20 is represented by the maximum width of the cross section of the multifilament, that is, the maximum width of the cross section of the aggregate of a plurality of monofilaments (a cross section orthogonal to the axial direction).

[0044] It should be noted that the twisted yarn 1 may also be a twisted yarn formed by twisting the tungsten wire 10 and the organic fiber 20. For example, the twisted yarn is produced by twisting the tungsten wire 10 and the organic fiber 20 in parallel (i.e., performing a twisting process). At least one of the tungsten wire 10 and the organic fiber 20 may also be a multifilament.

[0045] [Tungsten Wire]

[0046] Next, the structure of the tungsten wire 10 will be described.

[0047] The tungsten wire 10 is an alloy wire made of an alloy of tungsten (W) and at least one metal element other than tungsten (hereinafter referred to as an alloy element). The content of tungsten contained in the tungsten wire 10 is, for example, 90% by mass or more. Here, the content is the ratio of the mass of the metal element (e.g., tungsten) to the mass of the tungsten wire 10. The content of tungsten may be 95% by mass or more, 99% by mass or more, or 99.9% by mass or more.

[0048] At least one alloying element is a metal element contained in the 7th group or the 8th group of the periodic table. Specifically, the alloying element is rhenium (Re) of the 7th group or ruthenium (Ru) of the 8th group. For example, the tungsten wire 10 is an alloy wire of tungsten and rhenium (hereinafter referred to as rhenium-tungsten alloy wire). Alternatively, the tungsten wire 10 is an alloy wire of tungsten and ruthenium (hereinafter referred to as ruthenium-tungsten alloy wire). It should be noted that the tungsten wire 10 can also be an alloy wire of tungsten and two or more alloying elements, such as an alloy wire of tungsten, rhenium and ruthenium.

[0049] In the case of rhenium-tungsten alloy wire, the content of rhenium is, for example, 0.1 mass % to 10 mass %. The content of rhenium may be 0.5 mass % to 9 mass %, or 3 mass % to 5 mass %. In the case of ruthenium-tungsten alloy wire, the content of ruthenium is, for example, 0.05 mass % to 0.3 mass %. The content of ruthenium may be 0.1 mass % to 0.2 mass %.

[0050] The more the content of rhenium and / or ruthenium is, the higher the elongation and tensile strength of the tungsten wire 10 is. However, if the tensile strength is increased, the problem of elongation being difficult to increase is generated. In addition, the more the content of rhenium and / or ruthenium is, the more difficult it is to reduce the diameter of the tungsten wire 10. In this embodiment, according to the in-depth study of the inventors of this application, by focusing on the content of alloy elements and the processing steps of reducing the diameter, a thin tungsten wire 10 with high elongation and high tensile strength is realized. The specific method for manufacturing the tungsten wire 10 will be described below.

[0051] The wire diameter of the tungsten wire 10 is, for example, 40 μm or less. The wire diameter of the tungsten wire 10 may be 30 μm or less, or 20 μm or less. For example, the wire diameter of the tungsten wire 10 may be 18 μm or less, or 15 μm or less, or 12 μm or less, or 10 μm or less. The wire diameter of the tungsten wire 10 may also be as small as the processing limit (e.g., 5 μm).

[0052] The elongation of the tungsten wire 10 of the present embodiment is 5% or more. Thus, when the twisted yarn 1 having the tungsten wire 10 is manufactured and used, the tungsten wire 10 can be prevented from breaking. The elongation of the tungsten wire 10 can be 7% or more, 9% or more, 11% or more, 13% or more, or 16% or more. The higher the elongation, the better the effect of preventing the tungsten wire 10 from breaking.

[0053] The tensile strength of the tungsten wire 10 is, for example, 1600 MPa (=N / mm 2)~2400MPa. Thus, when manufacturing and using the twisted yarn 1 having the tungsten wire 10, the tungsten wire 10 can be prevented from breaking. The tensile strength of the tungsten wire 10 can be 1700MPa or more, 1800MPa or more, 2000MPa or more, or 2100MPa or more. The higher the tensile strength, the better the effect of preventing the tungsten wire 10 from breaking.

[0054] [Manufacturing method]

[0055] Next, in the method for manufacturing the tungsten wire 10 of the present embodiment, Figure 2 Provide explanation. Figure 2 This is a flowchart showing an example of a method for producing the tungsten wire 10 according to the present embodiment.

[0056] like Figure 2 As shown in , first, prepare a metal ingot (S10). Specifically, first, prepare a mixture of tungsten powder and a powder formed by an alloy metal (such as rhenium powder or ruthenium powder) in a specified ratio. The average particle size of the powder is, for example, in the range of 3μm to 4μm, but is not limited thereto. By pressing and sintering the prepared mixture, an ingot of tungsten alloy is made. The ingot is, for example, a rod-shaped ingot with a cross-sectional diameter of about 15mm.

[0057] Next, the ingot is subjected to die forging (S11). Specifically, the ingot is forged and compressed from the periphery to be stretched, thereby forming a linear tungsten wire. Instead of die forging, rolling may be performed. The die forging (S11) is repeated together with annealing (S13).

[0058] Specifically, by repeatedly performing die forging, the diameter of the ingot is reduced in the order of 13.6 mm, 10.6 mm, 8 mm, 6.5 mm, and 3.3 mm. When the diameter of the ingot is these diameters ("Yes" in S12), annealing is performed (S13). The annealing temperature is, for example, 2400°C. After the diameter becomes 3.3 mm, annealing and die forging are performed to reduce the diameter to 3 mm.

[0059] Next, the 3 mm diameter tungsten wire after die forging is heated at 900° C. (S14). Specifically, the tungsten wire is directly heated by a burner or the like. By heating the tungsten wire, an oxide layer is formed on the surface of the tungsten wire so that the wire will not break during subsequent heating and wire drawing.

[0060] Next, heated wire drawing is performed (S15). Specifically, the tungsten wire is drawn while being heated using one or more wire drawing dies, i.e., the tungsten wire is drawn (thinned). The heating temperature is, for example, 1000°C. It should be noted that the higher the heating temperature, the higher the processability of the tungsten wire, and therefore the easier it is to draw the wire. The heated wire drawing is repeated while replacing the wire drawing dies. The cross-sectional reduction rate of the tungsten wire produced by one wire drawing using one wire drawing die is, for example, 10% to 40%. In the heated wire drawing process, a lubricant obtained by dispersing graphite in water can also be used.

[0061] Next, the drawn tungsten wire is subjected to an intermediate recrystallization treatment (S16). Specifically, the tungsten wire is heated at a temperature of 1200°C or higher, so that the crystals contained in the tungsten wire are recrystallized. Before the wire drawing process becomes the last one ("No" in S17), the heating wire drawing and the intermediate recrystallization treatment are repeated. The number of repetitions at this time (i.e., the number of intermediate recrystallization treatments) is, for example, 5 to 10 times.

[0062] In the repeated heating wire drawing, a wire drawing die with a smaller hole diameter than the wire drawing die used in the previous wire drawing is used. In addition, in the repeated heating wire drawing, the tungsten wire is heated at a heating temperature lower than the heating temperature in the previous wire drawing. For example, the heating temperature in the wire drawing process before the final wire drawing process is lower than the heating temperature before that, for example, 400°C.

[0063] When the wire drawing step is the last one (Yes in S17), heating wire drawing is performed as the final wire drawing (S18). Thus, a tungsten wire having a wire diameter of less than about 40 μm is obtained.

[0064] Next, the drawn tungsten wire is electrolytically polished (S19). Electrolytic polishing is performed, for example, by immersing the tungsten wire and the counter electrode in an electrolyte such as sodium hydroxide aqueous solution to generate a potential difference between the tungsten wire and the counter electrode. The wire diameter of the tungsten wire can be finely adjusted by electrolytic polishing.

[0065] After the electrolytic polishing, the tungsten wire is subjected to a final heat treatment ( S20 ). The temperature of the final heat treatment is, for example, 1200° C. to 1700° C.

[0066] Through the above steps, the tungsten wire 10 of the present embodiment is manufactured. Through the above manufacturing steps, the length of the tungsten wire 10 just manufactured is, for example, 50 km or more, and can be used industrially. The tungsten wire 10 is cut into appropriate lengths according to the scheme used, and is used to manufacture the twisted yarn 1 or various fiber products. In this way, in the present embodiment, industrial mass production of the tungsten wire 10 can be achieved, and it can be mainly used for fiber products.

[0067] It should be noted that each process shown in the manufacturing method of the tungsten wire 10 is performed inline, for example. Specifically, the multiple wire drawing dies used in step S15, etc. are arranged on the production line in the order of decreasing aperture. In addition, a heating device such as a burner is arranged between each wire drawing die. The heating device is configured for heating for wire drawing and intermediate recrystallization treatment. In addition, on the downstream side (post-process side) of the wire drawing die used in step S15, the multiple wire drawing dies used in step S18 are arranged in the order of decreasing aperture, and an electrolytic grinding device and a heating device for final heat treatment are arranged on the downstream side of the wire drawing die with the smallest aperture. It should be noted that each process can also be performed individually.

[0068] [Example]

[0069] Next, examples and comparative examples of tungsten wires 10 manufactured by the above-mentioned manufacturing method are described. With respect to the tungsten wires 10 of the following examples 1 to 15 and comparative examples 1 to 8, various parameters in the manufacturing method (specifically, wire diameter, type and amount of additives, final heat treatment temperature, and number of intermediate recrystallization treatments) are appropriately varied. Specifically, as shown in the following Tables 1 and 2.

[0070] [Table 1]

[0071]

[0072] [Table 2]

[0073]

[0074] Figure 3 : is a scatter diagram showing the relationship between the elongation and tensile strength of the tungsten wire 10 of the embodiment and the comparative example. Figure 3 In the figure, the horizontal axis represents the elongation [%] of the tungsten wire 10 , and the vertical axis represents the tensile strength [MPa] of the tungsten wire 10 .

[0075] The wire diameters of the tungsten wires 10 of Examples 1 to 15 are all less than 40 μm. Figure 3 As shown in , the tungsten wire 10 of each embodiment is within the range of 1600MPa to 2400MPa in tensile strength and 5% to 16% in elongation. Figure 3 In the figure, the above ranges of tensile strength and elongation are indicated by dotted lines. Figure 3 outside the range indicated by the dotted line.

[0076] Hereinafter, the results of studying parameters in the method for producing the tungsten wire 10 that are expected to be the cause of the difference between the example and the comparative example will be described.

[0077] <Additives>

[0078] First, the types and addition amounts of alloy elements as additives (content in the tungsten wire 10) are described. As can be seen from Table 1, as the addition amount of the alloy elements increases, there is a tendency for the elongation to increase.

[0079] In addition, in Example 5 and Example 9 in Table 1, the wire diameter is 35 μm, the additive is Re, the final heat treatment temperature is 1600°C, the number of intermediate recrystallization treatments is 6 times, and the parameters other than the amount of Re added are the same. By comparing Example 5 with Example 9, it can be seen that Example 9, which has a large amount of Re added, has a higher elongation and a lower tensile strength than Example 5.

[0080] It can be seen that increasing the amount of alloying elements added can further improve the elongation while ensuring a tensile strength of 1600 MPa or more. Conversely, decreasing the amount of alloying elements added can further improve the tensile strength while ensuring an elongation of 5% or more.

[0081] Furthermore, when Ru is used as an additive as in Example 11, even if the amount of addition is about one digit smaller than that in the case of Re, both the elongation and the tensile strength can be ensured at a high level.

[0082] <Final heat treatment temperature>

[0083] Next, the final heat treatment temperature will be described. As can be seen from Table 1, as the final heat treatment temperature increases, there is a tendency for the elongation to increase.

[0084] In addition, the wire diameter of Example 1 and Example 2 in Table 1 is 11μm, the additive is Re, the additive amount is 5 mass%, the number of intermediate recrystallization treatments is 8 times, and the parameters other than the final heat treatment temperature are the same. By comparing Example 1 with Example 2, it can be seen that Example 2 with a high final heat treatment temperature has a higher elongation and lower tensile strength than Example 1. Example 5 and Example 6 also have the same parameters other than the final heat treatment temperature, and the same tendency is shown. For Examples 7 to 9, Examples 12 and 13, and Examples 14 and 15, the parameters other than the final heat treatment temperature are the same, and the same tendency is shown. The same tendency is shown in any of the cases where the wire diameter is 11μm (Examples 1 and 2) and 35μm (Example 5, etc.).

[0085] From these, it can be seen that, regardless of the wire diameter of the tungsten wire 10, when the final heat treatment temperature is increased, the elongation can be further improved while ensuring the tensile strength of 1600 MPa or more. Conversely, regardless of the wire diameter of the tungsten wire 10, when the final heat treatment temperature is lowered, the tensile strength can be further improved while ensuring the elongation of 5% or more.

[0086] In addition, the parameters other than the final heat treatment temperature of Comparative Examples 1 and 2 in Table 2 are the same as those of Examples 12 and 13 in Table 1. However, the elongation of Comparative Examples 1 and 2, in which the final heat treatment temperature is 1400°C or less, becomes less than 5%. It can be said that, in the case of at least a wire diameter of 35 μm, 5 mass% of Re is added, and 5 intermediate recrystallization treatments are performed, the elongation can be set to 5% or more by performing the final heat treatment at a temperature higher than 1400°C, preferably at a temperature higher than 1500°C.

[0087] Furthermore, when Ru was used as an additive as in Example 11, even if the final heat treatment temperature was 1200° C., both the elongation and the tensile strength could be ensured to be high.

[0088] <Number of intermediate recrystallization treatments>

[0089] Next, the number of intermediate recrystallization treatments will be described. As can be seen from Table 1, as the number of intermediate recrystallization treatments increases, there is a tendency for the elongation to increase. Specifically, if the number of intermediate recrystallization treatments is 5 or more, the elongation can be set to 5% or more.

[0090] In addition, in Example 6 and Example 10 in Table 1, the wire diameter is 35 μm, the additive is Re, the additive amount is 3 mass%, the final heat treatment temperature is 1700°C, and the parameters other than the number of intermediate recrystallization treatments are the same. By comparing Example 6 with Example 10, it can be seen that Example 6, which has a large number of intermediate recrystallization treatments, has a higher elongation and a lower tensile strength than Example 10. On the contrary, when the number of intermediate recrystallization treatments is reduced, the tensile strength can be further improved while ensuring an elongation of 5% or more.

[0091] In addition, the parameters other than the number of intermediate recrystallization treatments of Comparative Example 4 in Table 2 are the same as those of Examples 6 and 10 in Table 1. However, in this case, both the elongation and the tensile strength of Examples 6 and 10, which have the number of intermediate recrystallization treatments of 5 or more, are higher than those of Comparative Example 4, which has the number of intermediate recrystallization treatments of 3. This shows that when the number of intermediate recrystallization treatments is 3 or less, the elongation cannot be set to 5% or more.

[0092] In addition, it can be seen from Table 1 that the number of intermediate recrystallization treatments required varies depending on the wire diameter. Specifically, when the wire diameter is in the range of 11 μm to 18 μm, the elongation of the tungsten wire 10 becomes more than 5% when the number of intermediate recrystallization treatments is more than 8 times. On the other hand, when the wire diameter is 35 μm, the elongation of the tungsten wire 10 becomes more than 5% when the number of intermediate recrystallization treatments is more than 5 times. From this point, it can be judged that in order to obtain a tungsten wire 10 with a thin wire diameter, the number of intermediate recrystallization treatments can be increased compared to the case of obtaining a tungsten wire 10 with a thick wire diameter.

[0093] It should be noted that recrystallization treatment refers to rearrangement of crystals by heat treatment. Recrystallization treatment can promote the dispersion of solid solution elements such as Re or Ru, which helps to increase the elongation when the diameter of the tungsten wire 10 is reduced. In this way, by applying heat to the tungsten wire 10 as a recrystallization treatment in the manufacturing process, the dispersibility of the alloy element (Re or Ru) in the tungsten wire 10 is improved. As a result, it is possible to suppress the uneven presence of the alloy element, so that in the thin tungsten wire 10, it is possible to achieve both an increase in tensile strength and an increase in elongation.

[0094] It should be noted that, here, the case where the wire diameter of the tungsten wire 10 is less than 40 μm and the tensile strength is less than 2400 MPa is described as an example, but the present invention is not limited thereto. The wire diameter of the tungsten wire 10 may be greater than 40 μm. Furthermore, the tensile strength of the tungsten wire 10 may be greater than 2400 MPa.

[0095] [Relationship between the elongation of organic fiber and tungsten wire]

[0096] Next, the relationship between the elongation of the organic fiber 20 and the elongation of the tungsten wire 10 will be described.

[0097] Generally speaking, the organic fiber 20 has a higher elongation than the tungsten wire 10. In simple terms, the organic fiber 20 is easily elongated, while the tungsten wire 10 is not easily elongated. Therefore, when the organic fiber 20 is elongated by external stress such as stretching, bending, or twisting, if the tungsten wire 10 does not follow and elongate, a part of the tungsten wire 10 may be broken.

[0098] Figure 4 It is a schematic diagram showing the states of the twisted yarn 1 before and after elongation according to the present embodiment. Figure 4 (a) and (b) show a perspective view and a side development view of the twisted yarn 1 before elongation, and (c) and (d) show a perspective view and a side development view of the twisted yarn 1 after elongation.

[0099] exist Figure 4 In (a), Rp is used to represent the wire diameter of the organic fiber 20. In addition, Lp is used to represent the pitch of the winding of the tungsten wire 10. Figure 4As shown in (c), when the organic fiber 20 is stretched, the linear diameter of the organic fiber 20 becomes Rp'. As the organic fiber 20 is stretched, although the length of the organic fiber 20 increases, the volume does not change, so the linear diameter Rp' of the organic fiber 20 after stretching is necessarily smaller than the linear diameter Rp of the organic fiber 20 before stretching.

[0100] When the elongation of the tungsten wire 10 follows the elongation of the organic fiber 20, the pitch of the windings of the tungsten wire 10 after elongation becomes Lp'. The pitch Lp' of the windings of the tungsten wire 10 after elongation is larger than the pitch Lp of the windings of the tungsten wire 10 before elongation.

[0101] like Figure 4 As shown in (b) of FIG. 1 , if the length of the tungsten wire 10 before elongation is set to Lw, Lw is expressed by the following formula (1). Note that π is the pi.

[0102] (I)

[0103] like Figure 4 As shown in (d) of FIG. 1 , if the length of the tungsten wire 10 after extension is set to Lw′, Lw′ is expressed by the following formula (2).

[0104] (2)

[0105] When the elongation of the organic fiber 20 is set to Tp and the elongation of the tungsten wire 10 is set to Tw, Tp and Tw are respectively expressed by the following equations (3) and (4).

[0106] (3)

[0107] (4)

[0108] By converting equations (1) to (4), Tw is expressed by the following equation (5) using Rp, Lp, and Tp.

[0109] (5)

[0110] The value of Tw shown in the above formula (5) is the value of the elongation Tw required for the tungsten wire 10 to follow and extend without breaking the wire when the organic fiber 20 is extended at the elongation Tp. Therefore, when the elongation Tw of the tungsten wire 10 is greater than the right side of the above formula (5), it means that the tungsten wire 10 can follow the extension of the organic fiber 20.

[0111] Here, a specific example of the elongation Tp of the organic fiber 20 is used. Figure 5 Provide explanation.

[0112] Figure 5 2 is a graph showing the maximum value of the elongation Tp of each type of fiber that can be used as the organic fiber 20. Figure 5 As shown in , the maximum value of the elongation Tp of the organic fiber 20 varies greatly depending on the material. As the organic fiber 20 with the smallest elongation Tp, hemp (flax) is generally used, and the maximum value of the elongation Tp is 1.5% to 2.3%. In addition, polypropylene is a material that is relatively easy to stretch, and the maximum value of the elongation Tp is 25% to 60%. For other materials, the maximum value of the elongation Tp is generally in the range of 10% to 30%.

[0113] Figure 5 The maximum value of the elongation Tp shown in is an estimated value in a standard environment. For example, in a humid environment, since the organic fiber 20 becomes easier to stretch, the maximum value of the elongation Tp also becomes larger. In addition, in the case of multifilaments, the maximum value of the elongation Tp generally becomes larger. It is estimated that if the unevenness of the elongation Tp caused by such an environment is taken into account, the maximum value of the elongation Tp of the organic fiber 20 can be taken as Figure 5 The value is about 1.5 to 2.0 times the value shown in .

[0114] Next, use the specific value of Lp / Rp Figure 6 Provide explanation.

[0115] Figure 6 This is a diagram showing an example of Lp / Rp of the twisted yarn 1 when the tungsten wire 10 is wound around each of a plurality of organic fibers 20 having different wire diameters by a predetermined number of turns. Figure 6 , as examples of coating processing, four cases are shown, where the number of turns per inch is 21 and 18, and where the number of turns per 1 m is 100 and 1000. In addition, as examples of organic fibers 20, three cases are shown, where the wire diameter Rp is 0.3 mm, 0.8 mm, and 1.2 mm.

[0116] The value of Lp / Rp calculated from these combinations is within the range of 0.83 to 33.33. In addition, the value of Lp / Rp is generally within the range of 3 to 5.

[0117] In view of the above, the elongation Tp of the organic fiber 20 can be expected to be about 100% (i.e., elongated to 2 times) at maximum, and the value of Lp / Rp can be expected to be about 100 at maximum. The following is a calculation result of the elongation Tw of the tungsten wire 10 relative to the elongation Tp of the organic fiber 20 for each ratio (Lp / Rp) of Rp and Lp using the above formula (5). Figure 7 and Figure 8 middle.

[0118] Figure 7 and Figure 8 These are graphs showing the elongation Tw required for the tungsten wire 10 when the elongation Tp of the organic fiber 20 is within a predetermined range. Figure 7 and Figure 8 In the example, the values ​​of Lp / Rp are arranged in the row direction, the values ​​of Tp are arranged in the column direction, and the values ​​of Tw are recorded in the intersection cells of the rows and columns. Figure 7 In the example, the value of Tp is shown in the range of 0% to 40% with a 2% scale. Figure 8 In FIG. 1 , the value of Tp is shown in a range from 0% to 100% with a 5% scale. Figure 7 and Figure 8 , eight values ​​of Lp / Rp are shown, namely, 1, 2, 2.5, 3, 5, 10, 50, and 100. The smaller the value of Lp / Rp, the narrower the pitch of the tungsten wire 10 is wound, and the larger the value of Lp / Rp, the wider the pitch of the tungsten wire 10 is wound.

[0119] The tungsten wire 10 of this embodiment achieves an elongation Tw of 5% or more by the above-mentioned manufacturing method. Figure 7 and Figure 8 In the figure, when the elongation Tw of the tungsten wire 10 is 5%, hatching is performed to indicate a range in which the wire can be followed without breaking (ie, a range in which Tw calculated using the formula (5) is 5% or less).

[0120] like Figure 7 and Figure 8 As shown in , it can be seen that if the elongation Tp of the organic fiber 20 is 5% or less, the tungsten wire 10 can follow without interruption regardless of the value of Lp / Rp. Figure 5 As shown in , the elongation of hemp, which is the material with the lowest elongation as the organic fiber 20, is 4.6% (= 2.3 × 2)% at most, even if it is considered that it can be doubled in consideration of the dependence on the environment, etc. That is, it can be seen that when hemp is used as the organic fiber 20, the tungsten wire 10 can follow without interruption regardless of the pitch at which the tungsten wire 10 is wound.

[0121] In addition, when Lp / Rp is 2, Figure 8 As shown in , the tungsten wire 10 can follow the organic fiber 20 until the elongation Tp reaches 45%. Figure 5 It can be seen that it can not only handle the elongation of linen, but also various organic fibers such as cotton, silk, rayon, polyester, etc. When Lp / Rp is 2.5, Figure 7 As shown in , the tungsten wire 10 can follow the organic fiber 20 until the elongation Tp reaches 26%. Figure 5As Lp / Rp increases, the range of the elongation Tp of the organic fiber 20 that the tungsten wire 10 can follow becomes narrower, but it can cope with more types of organic fibers 20 depending on the use environment.

[0122] In addition, the tungsten wire 10 of Example 13 described above achieved an elongation Tw of 16%. Figure 7 and Figure 8 In the figure, if the elongation Tw of the tungsten wire 10 is 16%, dot hatching is given to indicate the range in which the wire can be followed without interruption (i.e., the range in which Tw calculated using the formula (5) is 16% or less (the range in which the wire is 5% or less is hatched)).

[0123] like Figure 7 As shown in , it is known that if the elongation Tp of the organic fiber 20 is 16% or less, the tungsten wire 10 can follow without interruption regardless of the value of Lp / Rp. Therefore, the tungsten wire 10 can follow more types of organic fibers 20 without interruption.

[0124] like Figure 5 As shown in FIG. 1 , there are not many organic fibers 20 that achieve an elongation exceeding 50%. When Lp / Rp is 2, as shown in FIG. Figure 8 As shown in , the tungsten wire 10 can follow the elongation Tp of the organic fiber 20 until it reaches 80%. In addition, when Lp / Rp is 2.5, the tungsten wire 10 can follow the elongation Tp of the organic fiber 20 until it reaches 55%. That is, it can be seen that in the case of the tungsten wire 10 with an elongation Tw of 16%, it can cope with Figure 5 Almost all types of organic fibers 20 shown in FIG.

[0125] As Lp / Rp increases, the range of the elongation Tp of the organic fiber 20 that the tungsten wire 10 can follow becomes narrower, but it can cope with more types of organic fibers 20 depending on the use environment. Figure 7 and Figure 8 As shown in , the tungsten wire 10 with an elongation of 16% can cope with the problem even if the elongation Tp of the organic fiber 20 increases by about 3 times compared to the tungsten wire 10 with an elongation of 5%.

[0126] By increasing Lp / Rp, it is possible to shorten the length of the tungsten wire 10 used in the twisted yarn 1. Therefore, the amount of the tungsten wire 10 used can be reduced, thereby achieving weight reduction and cost reduction of the twisted yarn 1.

[0127] [Fiber products with twisted yarn]

[0128] Next, for those who have Figure 1 A specific example of a fiber product of the twisted yarn 1 shown in FIG. 1 will be described.

[0129] The fiber product is one selected from a textile, a woven product, a knitted product, a twisted yarn, and a sewing yarn. Figure 1 The twisted yarn 1 shown in the gloves is used Fig. 9 Provide explanation.

[0130] Fig. 9 Schematic diagram of a fiber product 100 having a twisted yarn 1 according to an embodiment. Fig. 9 As shown in FIG. 1 , the fiber product 100 is, for example, a glove. Fig. 9 In FIG. 1 , only the weave holes are schematically shown at the tips of the thumb and the index finger, but the entire fiber product 100 is in the weave hole shape.

[0131] The fiber product 100 is, for example, a work glove having a palm portion and five fingers. The fiber product 100 is manufactured by spinning the twisted yarn 1 as the warp and weft yarns. The fabric structure of the fiber product 100 is, for example, a twill weave (specifically, a four-wire twill with a 2 / 2 twill structure). Specifically, Fig. 9 As shown in , the fiber product 100 is formed by alternately intersecting a plurality of twisted yarns 1 constituting the warp and a plurality of twisted yarns 1 constituting the weft in twos each.

[0132] It should be noted that the fabric structure of the fiber product 100 is not limited to this, and may be other twill weaves such as three-line twill or four-line twill with a 3 / 1 twill structure. Alternatively, the fabric structure of the fiber product 100 may be plain weave or satin weave. In addition, the fiber product 100 may also be manufactured by using the twisted yarn 1 as the spun yarn and performing a weaving process such as plain weaving with a predetermined gauge.

[0133] Fig. 9 The fiber product 100 shown in the figure can be used for scratch resistance or vital sign sensing, for example. For example, the fiber product 100 can sense the body temperature or pulse of the wearer as an example of a vital sign. Specifically, the tungsten wire 10 of the fiber product 100 functions as a terminal for sensing vital signs. That is, the tungsten wire 10 can detect the weak current generated by the wearer.

[0134] Alternatively, the fiber product 100 may be provided with a terminal for sensing a vital sign separately. In this case, the tungsten wire 10 may also function as a wiring for electrically connecting the terminal to the signal processing circuit.

[0135] Furthermore, the fiber product 100 can also be used for heat generation. Specifically, a current can be passed through the tungsten wire 10 included in the fiber product 100 to generate heat.

[0136] The fiber products may be clothing products including clothes, headwear such as hats, footwear such as socks and tabi, etc., in addition to gloves. Alternatively, the fiber products may be towels, handkerchiefs, blankets, bed sheets, etc.

[0137] It should be noted that the fiber product does not necessarily have the twisted yarn 1, and it is sufficient as long as the tungsten wire 10 and the organic fiber 20 are combined. Specifically, the fiber product may also be a non-woven fabric manufactured by using the tungsten wire 10 and the organic fiber 20 as wire materials for non-woven fabric processing. In addition, the fiber product may also be a product formed by gathering the twisted yarn 1 into a cotton-like (cotton-like) shape. Alternatively, the fiber product may also be a product formed by sewing (embroidering or sewing) the tungsten wire 10 onto a fiber fabric such as a textile, a woven product, or a knitted product manufactured using organic fibers.

[0138] [Bendability of tungsten wire]

[0139] Next, the bendability of the tungsten wire 10 was measured using Fig.10 Provide explanation.

[0140] like Figure 1 As shown in FIG, the tungsten wire 10 is wound around the organic fiber 20 and is therefore required to be able to withstand bending with a curvature greater than a predetermined value. Fig. 9 In order to withstand various processes such as spinning and weaving, the fiber product 100 shown in FIG. 1 is also required to withstand bending with a curvature greater than a predetermined curvature. Therefore, the inventors of the present application conducted a winding test to confirm the bendability of the tungsten wire 10. The contents and results of the winding test are described below.

[0141] Fig.10 1 is a diagram showing an overview of a winding test of the tungsten wire 10 according to the embodiment. In the winding test, the tungsten wire 10 is wound around a rod-shaped core material 200 having a circular cross-sectional shape and a uniform diameter, and whether or not the tungsten wire 10 is broken or peeled off on the surface is confirmed. The cross-sectional diameter R of the core material 200 and the diameter φ of the tungsten wire 10 used in the winding test are defined, for example, according to the specifications of a fiber product manufactured using the tungsten wire 10 and the organic fiber 20.

[0142] Fig.11: is a cross-sectional view showing a fiber product (metal mesh) 110 woven using the tungsten wire 10 and the organic fiber 20 of the present embodiment. The fiber product 110 is a metal mesh woven using the tungsten wire 10 and the organic fiber 20 as the warp and weft, respectively. As an example of the fiber product 110, it is assumed that a 900-mesh metal mesh is manufactured using a tungsten wire 10 and an organic fiber 20 having a diameter of 12 μm. It should be noted that the mesh (mesh number) here refers to the number of wires between 25.4 mm (1 inch). In this case, the distance between two adjacent tungsten wires 10, i.e., the spacing, becomes 28.2 μm (=25.4 mm÷900). It is assumed that the distance between two adjacent tungsten wires 10 is the same as the distance between two adjacent organic fibers 20.

[0143] In this case, if Fig.11 As shown in , the radius of curvature Rc of the tungsten wire 10 becomes 19.6 μm. It should be noted that the radius of curvature Rc is defined based on the central axis of the tungsten wire 10 (the dotted line in the figure). In addition, the inner radius of curvature Ri of the tungsten wire 10 becomes 13.6 μm. The inner radius of curvature Ri is defined based on the inner surface of the bend of the tungsten wire 10. That is, if the tungsten wire 10 is set to a state where the radius of curvature Rc is less than 19.6 μm and the inner radius of curvature Ri is less than 13.6 μm, and does not break or produce surface peeling, it can be used as the warp and weft of the fiber product 110.

[0144] The winding test was conducted under conditions exceeding the limit of weaving into a metal mesh. The result of the winding test under conditions exceeding the limit of weaving is that the tungsten wire 10 used in the test can be used to stably manufacture a fiber product (metal mesh) 110 without causing breakage (wire breakage) or surface peeling of the tungsten wire 10.

[0145] For example, the condition for contact between tungsten wires 10 having a diameter of 12 μm is 1222 mesh. That is, it is impossible to manufacture a metal mesh having a mesh number greater than 1222 mesh. As the conditions for the winding test, a tungsten wire 10 of 12 μm and a fiber product 110 of 1324 mesh are assumed.

[0146] It should be noted that the breaking of the tungsten wire 10 is caused by the strain of the material constituting the tungsten wire 10, so tungsten wires 10 with different wire diameters can be used for research. For example, if the conditions of 12 μm and 1324 mesh are converted to 35 μm tungsten wire 10, it becomes 454 mesh (=1324 mesh×12 μm÷35 μm). Under this condition, the curvature radius Rc is 31 μm, and the inner curvature radius Ri is 13.5 μm.

[0147] The inventors of the present application used a core material 200 with a diameter of R = 27 μm and a tungsten wire 10 with a diameter of φ = 35 μm in the winding test. The inner radius of curvature Ri of the tungsten wire 10 wound on the core material 200 became 13.5 μm (= R ÷ 2), and the radius of curvature Rc became 31.0 μm (= Ri + φ ÷ 2). Therefore, when no breakage or surface peeling occurred in the winding test under this condition, it means that a 900-mesh fiber product (metal mesh) 110 can be manufactured using a 12 μm tungsten wire 10.

[0148] Table 3 below shows the results of the winding test of Comparative Examples 9 and 10 and Example 16. It should be noted that the wire diameter is 35 μm, the alloy element added is Re, and the addition amount is 5 mass %. In addition, the number of intermediate recrystallization treatments is 6 times.

[0149] [Table 3]

[0150]

[0151] Fig. 12A This is a diagram showing the appearance of the tungsten wire of Example 16 after the winding test. Fig. 12B Yes Fig. 12A A part of the image is enlarged. Fig. 12A and Fig. 12B As shown in , in Example 16, neither the tungsten wire was broken nor the surface peeling occurred.

[0152] Fig.13A It is a figure which shows the external appearance of the tungsten wire of Comparative Example 10 after the winding test. Fig. 13B Yes Fig.13A A part of the image is enlarged. Fig.13A and Fig. 13B As shown in , although there was no breakage of the tungsten wire in Comparative Example 10, slight surface peeling occurred. Therefore, although the fiber product (metal mesh) 110 can be manufactured at an elongation of 4%, for the manufacture of a fiber product 110 of higher quality, an elongation of 5% or more is preferred.

[0153] It should be noted that the wire diameter and mesh pitch of the tungsten wire 10 are not limited to the above examples.

[0154] [Effects, etc.]

[0155] As described above, the twisted yarn 1 as an example of the fiber product includes: the tungsten wire 10 having an elongation of 5% or more; and the organic fiber 20 combined with the tungsten wire 10 .

[0156] As a result, the tungsten wire 10 can easily follow the extension of the organic fiber 20 , and thus the tungsten wire 10 can be prevented from being broken.

[0157] Furthermore, for example, the wire diameter of the tungsten wire 10 is 40 μm or less.

[0158] This makes it easier to twist the organic fiber 20, and the productivity of the twisted yarn 1 and the fiber product manufactured using the twisted yarn 1 can be improved.

[0159] In addition, for example, the tungsten wire 10 is an alloy wire made of an alloy of tungsten and at least one metal element other than tungsten. In addition, for example, the at least one metal element is an element included in Group 7 or Group 8.

[0160] Thus, the alloy elements are uniformly dispersed in the tungsten wire 10 , and thus the elongation can be improved while maintaining the tensile strength at a high level.

[0161] Furthermore, for example, the tungsten wire 10 does not break even when bent until the radius of curvature thereof becomes a predetermined value of 13.6 μm or less.

[0162] Thereby, a metal net equivalent to 900 mesh as described above can be stably manufactured.

[0163] In addition, for example, the organic fiber 20 is at least one type of fiber selected from the group consisting of synthetic fibers, natural fibers, and regenerated fibers. When the organic fiber 20 is a monofilament, the elongation of the organic fiber 20 is 70% or less.

[0164] Thus, the elongation of the organic fiber 20 does not become too high, and thus the tungsten wire 10 can easily follow without breaking.

[0165] For example, the tungsten wire 10 and the organic fiber 20 constitute the twisted yarn 1. For example, the twisted yarn 1 is a core-covered yarn having the organic fiber 20 as a core yarn and the tungsten wire 10 as a sheath yarn.

[0166] Thus, various fiber products can be manufactured using the twisted yarn 1 including the tungsten wire 10. For example, the fiber product is one selected from a woven product, a knitted product, a braided product, a twisted yarn, and a sewing yarn.

[0167] (other)

[0168] As mentioned above, although the fiber product of this invention was demonstrated based on the said embodiment etc., this invention is not limited to the said embodiment.

[0169] In addition, for example, the tungsten wire 10 may be made of tungsten doped with potassium (K). The doped potassium exists at the crystal grain boundary of tungsten. The content of tungsten in the tungsten wire 10 is, for example, 99 mass % or more.

[0170] The potassium content in the tungsten wire 10 is 0.01 mass % or less, but is not limited thereto. For example, the potassium content in the tungsten wire 10 may be 0.005 mass % to 0.010 mass %.

[0171] The smaller the wire diameter of the tungsten wire made of tungsten doped with potassium (potassium-doped tungsten wire) becomes, the higher the tensile strength becomes. The wire diameter, elastic modulus and tensile strength of the potassium-doped tungsten wire are the same as those in the above-mentioned embodiment.

[0172] Thus, by including a small amount of potassium in the tungsten wire, the growth of crystal grains in the radial direction of the tungsten wire can be suppressed. That is, the width of the surface crystal grains can be reduced, thereby improving the tensile strength.

[0173] The potassium-doped tungsten wire can be manufactured by the same manufacturing method as that of the embodiment by using a tungsten powder doped with potassium instead of tungsten powder.

[0174] Furthermore, for example, the surface of the tungsten wire 10 may be coated with an oxide film or a nitride film.

[0175] In addition, for example, in the above-mentioned embodiment, the twisted yarn 1 composed of one tungsten wire 10 and one organic fiber 20 is shown, but the number of tungsten wires 10 and organic fibers 20 combined is not limited to this. For example, two or more tungsten wires 10 may be combined with one organic fiber 20. Specifically, the twisted yarn 1 may be a core-covered yarn in which two or more tungsten wires 10 are wound together with one organic fiber 20 as a core yarn. The twisted yarn 1 may also be a double-twisted yarn in which one organic fiber 20 and two or more tungsten wires 10 are twisted together.

[0176] Alternatively, one tungsten wire 10 may be combined with two or more organic fibers 20. Specifically, the twisted yarn 1 may be a core-covered yarn in which two or more organic fibers 20 are used as core yarns and wound around one tungsten wire 10. The twisted yarn 1 may be a double-twisted yarn in which two or more organic fibers 20 and one tungsten wire 10 are twisted together.

[0177] In addition, two or more tungsten wires 10 may be combined with two or more organic fibers 20. Specifically, the twisted yarn 1 may be a core-covered yarn in which two or more organic fibers 20 are used as core yarns and two or more tungsten wires 10 are wound together. The twisted yarn 1 may be a double-twisted yarn in which two or more organic fibers 20 and two or more tungsten wires 10 are twisted together.

[0178] Furthermore, for example, instead of the plurality of tungsten wires 10, the twisted yarn 1 may be manufactured using tungsten wires 10 and metal wires other than the tungsten wires 10. For example, tungsten wires and molybdenum wires may also be used.

[0179] Furthermore, when a plurality of organic fibers 20 are used, the plurality of organic fibers 20 may be manufactured using the same material as each other or may be manufactured using different materials.

[0180] In addition, for example, in the above embodiment, the wire diameter of the tungsten wire 10 is smaller than the wire diameter of the organic fiber 20, but the present invention is not limited thereto. For example, the wire diameter of the tungsten wire 10 and the wire diameter of the organic fiber 20 may be equal.

[0181] In addition, the present invention also includes the following methods: methods obtained by implementing various modifications that can be conceived by those skilled in the art to the various embodiments; methods achieved by arbitrarily combining the constituent elements and functions in the various embodiments without departing from the gist of the present invention.

[0182] Explanation of symbols

[0183] 1 twisted yarn (fiber products)

[0184] 10 Tungsten wire

[0185] 20 Organic Fiber

[0186] 100, 110 Fiber products

Claims

1. A fiber product comprising: Tungsten wire with an elongation of 5% or more; and An organic fiber combined with the tungsten wire.

2. The fiber product according to claim 1, wherein The wire diameter of the tungsten wire is less than 40 μm.

3. The fiber product according to claim 1, wherein The tungsten wire is an alloy wire made of an alloy of tungsten and at least one metal element other than tungsten.

4. The fiber product according to claim 3, wherein: The at least one metal element is an element included in Group 7 or Group 8.

5. The fiber product according to claim 1, wherein The tungsten wire does not break even when bent until the radius of curvature becomes a specified value of 13.6 μm or less.

6. The fiber product according to any one of claims 1 to 5, wherein The organic fiber is at least one fiber selected from synthetic fibers, natural fibers and regenerated fibers. When the organic fiber is a monofilament, the elongation of the organic fiber is 70% or less.

7. The fiber product according to any one of claims 1 to 5, wherein The tungsten wire and the organic fiber form a twisted yarn.

8. The fiber product according to claim 7, wherein: The twisted yarn is a core-covered yarn having the organic fiber as a core yarn and the tungsten wire as a sheath yarn.

9. The fiber product according to claim 7, wherein: The fiber product is one selected from textiles, woven products, knitted products, twisted yarns and sewing yarns.

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