JP2018001436A - Method for producing metal mesh - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a high-performance metal mesh that can be used for a screen mesh and the like.SOLUTION: The method includes the steps of net-making a screen mesh 10 by using a plurality of tungsten wires 100 and forming irregularities on the surfaces of the plurality of tungsten wires 100 constituting the screen mesh 10 given by net making.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for manufacturing a metal mesh.

  Conventionally, a printed wiring board is manufactured by forming (printing) a wiring pattern on an insulating substrate by screen printing. In screen printing, a screen mesh formed by knitting a plurality of metal wires is used. In Patent Document 1, a plurality of metal wires are thinned by grinding and polishing the screen mesh. Thereby, the wiring pattern of the printed wiring board is miniaturized.

JP2013-118222A

  However, the conventional screen mesh is configured using a stainless steel metal wire. Since stainless steel metal wires are not strong enough, elongation during use, short life, and the like occur.

  Then, an object of this invention is to provide the manufacturing method of the metal mesh which can manufacture the high performance metal mesh which can be utilized for a screen mesh etc.

  In order to achieve the above object, a method for manufacturing a metal mesh according to an aspect of the present invention includes a step of netting a metal mesh using a plurality of tungsten wires, and a plurality of tungsten constituting the netted metal mesh. Forming irregularities on the surface of the line.

  ADVANTAGE OF THE INVENTION According to this invention, the high performance metal mesh which can be utilized for a screen mesh etc. can be manufactured.

3 is a plan view of a screen mesh according to Embodiment 1. FIG. It is sectional drawing of the screen mesh which concerns on Embodiment 1 in the II-II line | wire of FIG. 6 is a plan view showing another example of the screen mesh according to Embodiment 1. FIG. It is sectional drawing which shows another example of the screen mesh which concerns on Embodiment 1 in the IV-IV line of FIG. 4 is a plan view of a screen plate using the screen mesh according to Embodiment 1. FIG. 3 is a cross-sectional view schematically showing screen printing using the screen mesh according to Embodiment 1. FIG. 3 is a flowchart showing a method of manufacturing a scream mesh according to Embodiment 1. It is a figure which shows the surface roughness Ra by the chemical | medical treatment of the screen mesh which concerns on Embodiment 1, and the change of a film thickness. It is a figure which shows the evaluation result of the tungsten wire which concerns on Embodiment 1. FIG. 6 is an external view of a metal mesh according to Embodiment 2. FIG. 6 is a schematic diagram of a tungsten fiber used for metal mesh production according to Embodiment 2. FIG. 5 is a flowchart showing a method for manufacturing a metal mesh according to Embodiment 2. 10 is a flowchart showing a method for manufacturing a metal mesh according to a modification of the second embodiment.

  Below, the manufacturing method of the metal mesh which concerns on embodiment of this invention is demonstrated in detail using drawing. Each of the embodiments described below shows a specific example of the present invention. Therefore, numerical values, shapes, materials, components, arrangement and connection forms of components, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. Therefore, for example, the scales and the like do not necessarily match in each drawing. Moreover, in each figure, the same code | symbol is attached | subjected about the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment 1)
[Screen mesh (metal mesh)]
First, an outline of a screen mesh (metal mesh) according to the present embodiment will be described with reference to FIGS. FIG. 1 is a plan view of a screen mesh 10 according to the present embodiment. FIG. 2 is a cross-sectional view of screen mesh 10 according to the present embodiment taken along line II-II in FIG.

  As shown in FIG. 1, the screen mesh 10 is an example of a metal mesh made using a plurality of tungsten wires 100 and is a screen mesh for screen printing. The woven structure of the screen mesh 10 is, for example, a twill (specifically, a four twill having a 2/2 twill structure). Specifically, as shown in FIG. 2, the plurality of tungsten wires 100 constituting the warp yarn 11 and the plurality of tungsten wires 100 constituting the weft yarn 12 alternately intersect each other vertically, The screen mesh 10 is formed.

  The woven structure of the screen mesh 10 is not limited to this, and may be other twills such as three twills or four twills having a 3/1 twill structure. Alternatively, the woven structure of the screen mesh 10 may be a plain weave or a satin weave.

  The plurality of warp yarns 11 and the plurality of weft yarns 12 are respectively arranged at substantially equal intervals. The interval (pitch) between the two adjacent warp yarns 11 and the interval (pitch) between the two adjacent weft yarns 12 are not particularly limited. The pitch of the warp yarn 11 and the pitch of the weft yarn 12 may be the same or different. For example, 430 warp yarns 11 and weft yarns 12 are arranged 430 per inch.

  The plurality of tungsten wires 100 constituting each of the warp yarn 11 and the weft yarn 12 are all the same, for example, but may be different from each other. For example, tungsten wires 100 having different wire diameters for the warp yarn 11 and the weft yarn 12 may be used. Details of the tungsten wire 100 will be described later.

  The warp yarn 11 and the weft yarn 12 intersect each other at substantially right angles, whereby a plurality of openings (mesh) 13 are formed at a plurality of intersecting portions. The opening 13 is an opening having a substantially rectangular shape in plan view formed by two adjacent warp yarns 11 (tungsten wire 100) and two adjacent weft yarns 12 (tungsten wire 100).

  The opening 13 is a portion through which a printing material (ink) used for screen printing passes. By selectively filling the plurality of openings 13 according to a desired wiring pattern or the like, the screen mesh 10 has a portion through which the printing material can pass (passing portion 22 (see FIG. 5)) and a portion through which the printing material cannot pass ( A non-passing portion 23 (see FIG. 5)). Thereby, a desired wiring pattern can be printed on a subject such as a substrate by screen printing. An emulsion or the like is used for filling the opening 13. Details of the screen printing will be described later with reference to FIGS.

  The number of openings 13 per unit area (number of openings) and the area of openings 13 per unit area (aperture ratio) when the screen mesh 10 is viewed in plan are not particularly limited. When the numerical aperture is large and the numerical aperture is large, the accuracy of screen printing using the screen mesh 10 can be increased. For example, a high-definition wiring pattern can be formed by screen printing.

  In the present embodiment, minute irregularities are formed on the surfaces of the warp yarn 11 and the weft yarn 12. The minute irregularities are constituted by a plurality of irregularly-shaped concave portions (or convex portions) that are irregularly arranged and substantially uniformly formed on the surfaces of the warp yarn 11 and the weft yarn 12. By forming the micro unevenness, the surface roughness Ra of each of the warp yarn 11 and the weft yarn 12 is, for example, larger than 0.10 μm, and preferably 0.15 μm or more. By increasing the surface roughness Ra of the warp yarn 11 and the weft yarn 12, the retention of the emulsion can be increased.

  When the tungsten wire 100 constituting the warp yarn 11 and the weft yarn 12 is drawn, a long groove (line-shaped recess) along the extending direction of the tungsten wire 100 can be formed on the surface. In the present embodiment, the surface of each of the warp yarn 11 and the weft yarn 12 is not limited to the line-shaped recesses, but has irregular irregularities and shapes (for example, recesses having a circular shape in plan view). Is formed.

  The screen mesh 10 may be rolled after netting. FIG. 3 is a plan view of the screen mesh 10a according to the present embodiment. FIG. 4 is a cross-sectional view of the screen mesh 10a according to the present embodiment taken along line IV-IV in FIG.

  The screen mesh 10a is obtained by rolling the screen mesh 10 shown in FIGS. Specifically, the screen mesh 10 is rolled in the thickness direction using a rolling roll or the like. Thereby, as shown in FIG.3 and FIG.4, the rolling part 14 is formed in each of the warp yarn 11 and the weft yarn 12 of the screen mesh 10. FIG.

  The rolling part 14 is a flat part formed by pressing the screen mesh 10 in the thickness direction. Specifically, the rolling portion 14 is a portion where each of the warp yarn 11 and the weft yarn 12 is plastically deformed. As shown in FIG. 4, the rolling portion 14 is formed on the upper and lower surfaces of the warp yarn 11 and the weft yarn 12.

  In the rolled screen mesh 10a, the fixing strength between the warp yarn 11 and the weft yarn 12 is increased. For this reason, even if it is a case where it pushes in with the squeegee etc. in the case of screen printing, it is suppressed that the shape of the opening 13 deform | transforms. Therefore, the accuracy of screen printing can be increased.

  Also in the screen mesh 10 a shown in FIGS. 3 and 4, fine irregularities are formed on the surfaces of the warp yarn 11 and the weft yarn 12. Specifically, fine irregularities are also formed on the surface of the rolled portion 14. For example, the surface roughness Ra of the rolled portion 14 is, for example, larger than 0.10 μm, and preferably 0.15 μm or more. Thus, in the screen mesh 10a, minute irregularities are formed on substantially the entire surface of the warp yarn 11 and the weft yarn 12 (including the rolled portion 14).

[Tungsten wire]
Next, the tungsten wire 100 used for the screen meshes 10 and 10a will be described. The screen meshes 10 and 10a described above are made with a tungsten wire 100 having the following characteristics.

  The tungsten wire 100 is an extremely fine metal wire (metal fiber), and the wire diameter (diameter) of the tungsten wire 100 (wire diameter d shown in FIGS. 1 and 2) is, for example, 22 μm or less. For example, the wire diameter of the tungsten wire 100 may be 18 μm, 16 μm, 13 μm, 9 μm, or 5 μm or less.

  In the present embodiment, the surface roughness Ra of the tungsten wire 100 is 0.10 μm or less. For example, the surface roughness Ra may be 0.7 μm or 0.4 μm or less. As described above, since the surface of the tungsten wire 100 is smooth, it is possible to suppress wear of equipment during net making using the tungsten wire 100, disconnection during rolling, and the like. In addition, the surface roughness Ra of the tungsten wire 100 (that is, the warp yarn 11 and the weft yarn 12) after netting may be larger than 0.10 μm.

  The tensile strength of the tungsten wire 100 is, for example, 3700 MPa or more and 4200 MPa or less.

  Further, the tungsten wire 100 is excellent in straightness. Straightness can be expressed in terms of droop length. The drooping length corresponds to the length of the tungsten wire 100 when the tension is released from a state in which the tungsten wire 100 having a predetermined length is straightly pulled in a posture along the vertical direction. Specifically, the drooping length when the length of the tungsten wire 100 is 1000 mm is, for example, 900 mm or more. That is, the length (hanging length) of the tungsten wire 100 is 900 mm or more when the both ends of the 1000 mm tungsten wire 100 are held, pulled vertically and straightened, and then released at the lower end. In other words, the tungsten wire 100 is kept straight without almost shrinking.

  The tungsten wire 100 is made of pure tungsten, for example. Pure tungsten is tungsten having a purity of 99.9% or more. The purity of the tungsten wire 100 may be, for example, 95% or more, but is not limited thereto. In the present embodiment, the purity of the tungsten wire 100 is approximately 100%.

  The tungsten wire 100 can be manufactured, for example, by the following method. First, a tungsten powder having a particle size of 5 μm is press-molded and sintered to form an ingot. Next, the ingot tungsten lump is formed into a wire shape by performing a swaging process for forging compression from the surroundings and extending. Thereafter, wire drawing (drawing) using a plurality of wire drawing dies whose hole diameters are gradually reduced is repeated. At this time, for example, the weight ratio of the amount of oxide at the time of 50 MG is set to 0.2% to 0.5%, and the drawing is started from a single crystal diamond die having a hole diameter of 200 μm. Thereby, the tungsten wire 100 having a surface roughness Ra of 0.10 μm or less can be manufactured. “MG” is a unit indicating a numerical value of the mass of a line having a length of 200 mm in milligrams.

  Note that heat treatment after swaging and electropolishing after wire drawing may be appropriately performed. Thereby, the surface property of the tungsten wire 100 can be further enhanced. That is, the surface roughness Ra of the tungsten wire 100 can be further reduced.

[Screen printing]
FIG. 5 is a plan view of a screen plate 20 using the screen mesh 10 according to the present embodiment. FIG. 6 is a cross-sectional view schematically showing screen printing using the screen mesh 10 according to the present embodiment.

  As shown in FIG. 5, the screen mesh 10 is fixed to the frame member 21 using an adhesive or the like. The frame member 21 is formed using, for example, a wooden frame or an aluminum frame. The size of the frame material 21 depends on the size of the printing target and is not particularly limited.

  After the screen mesh 10 is washed as necessary, a photosensitive emulsion is applied (coated) to the entire surface of the screen mesh 10 (specifically, within the frame of the frame member 21). The passage part 22 and the non-passage part 23 are formed by exposing using the mask (positive film etc.) corresponding to a desired pattern.

  The passage portion 22 is a portion through which a printing material (ink) 32 for screen printing passes, and is a portion where the emulsion is not held by the screen mesh 10. That is, the passage part 22 is a set of a plurality of openings 13 that are not filled. In the example shown in FIG. 5, the passage portion 22 is formed in a letter “A” shape.

  The non-passing portion 23 is a portion where the printing material 32 for screen printing does not pass and is a portion where the emulsion is held by the screen mesh 10. That is, each of the plurality of openings 13 included in the non-passing portion 23 is filled with the emulsion. The non-passing part 23 is a part excluding the passing part 22 in the frame of the frame member 21.

  As shown in FIG. 6, screen printing is performed using the screen plate 20 shown in FIG. Here, a method for forming the conductive wiring pattern 41 on the surface of the substrate 40 by screen printing will be described.

  Specifically, the printing material 32 is filled into the passage portion 22 using a scraper (not shown). For example, in the case of forming a wiring pattern, the printing material 32 is a conductive material such as a silver paste, but is not limited thereto.

  After the passage portion 22 is filled with the printing material 32, the squeegee 31 is moved along the surface of the screen mesh 10 as indicated by an arrow pointing to the right in FIG. Specifically, since a certain gap is formed between the frame member 21 and the surface of the substrate 40, the squeegee 31 is moved so as to push the screen mesh 10 toward the substrate 40. Thereby, the printing material filled in the passage portion 22 adheres to the substrate 40, and the wiring pattern 41 is formed.

[Screen mesh manufacturing method]
Then, the manufacturing method of the screen mesh 10 and 10a which concerns on this Embodiment is demonstrated. Here, the manufacturing method of the screen mesh 10a is demonstrated using FIG. FIG. 7 is a flowchart showing a method for manufacturing the screen mesh 10a according to the present embodiment. The screen mesh 10 is manufactured by omitting the rolling step (S12) shown in FIG.

  First, a screen mesh 10a for screen printing is made using a plurality of tungsten wires 100 (S10). Specifically, the screen mesh before rolling is made by weaving a plurality of tungsten wires 100 as warp yarns 11 and weft yarns 12 using a net making apparatus (loom).

  As described above, the surface roughness Ra of the tungsten wire 100 used in the net making process (S10) is, for example, 0.10 μm or less. That is, the surface roughness Ra of the warp yarn 11 and the weft yarn 12 of the screen mesh 10a immediately after the net making is substantially the same as the surface roughness Ra of the tungsten wire 100, for example, 0.10 μm or less.

  Moreover, the tensile strength of the tungsten wire 100 used in the net making process (S10) is, for example, 3700 MPa or more and 4200 MPa or less. Further, the wire diameter of the tungsten wire 100 used in the net making process (S10) is 22 μm or less. Moreover, the drooping length in the case where the length of the tungsten wire 100 used in the net making process (S10) is 1000 mm is 900 mm or more. The surface roughness Ra, the tensile strength, the wire diameter, the drooping length, etc. of the tungsten wire 100 are not limited to these examples.

  Next, the screen mesh 10a that has been netted is rolled (S12). For example, the rolling portion 14 is formed on the upper and lower surfaces of the warp yarn 11 and the weft yarn 12 by pressing the screen mesh 10a in the thickness direction using a rolling roll or the like. The rolling part 14 is flattened, and for example, the surface roughness Ra is 0.10 μm or less.

  Next, minute irregularities are formed on the surface of the warp yarn 11 and the weft yarn 12 constituting the screen mesh 10a made of net (S14). That is, the screen mesh 10a is roughened. In the present embodiment, minute irregularities are formed after the rolling step (S12). Specifically, minute irregularities are formed on the entire surface of the warp yarn 11 and the weft yarn 12 including the rolled portion 14. For example, the minute unevenness is formed by bringing the drug into contact with the screen mesh 10a.

The drug is, for example, a hydrogen peroxide solution (H ₂ O ₂ ) or an alkaline solution. By immersing the screen mesh 10a in a medicine placed in a container of an appropriate size, the medicine can be brought into contact with the entire surface of the warp yarn 11 and the weft yarn 12, and minute irregularities can be formed on the entire surface.

  Thereby, the surface roughness Ra of the warp yarn 11 and the weft yarn 12 becomes larger than, for example, 0.10 μm. By controlling the component concentration of the drug and the contact time with the drug, the surface roughness Ra after the treatment can be adjusted.

  FIG. 8 is a diagram showing changes in the surface roughness Ra and the film thickness due to the chemical treatment of the screen mesh 10a according to the present embodiment. FIG. 8 shows the film thickness (vertical axis on the left side) and surface roughness Ra (horizontal axis) in each of the initial state before contact with the drug and the state at the time (t1 to t4) after a predetermined period after contact (vertical axis). Right vertical axis). Note that the elapsed time from the initial state becomes longer in this order from the time point t1 to t4.

  Here, the surface of the screen mesh 10a made with a tungsten wire 100 having an initial wire diameter of 16 μm and a surface roughness Ra of 0.11 μm was roughened. The film thickness of the screen mesh 10a is the length in the direction perpendicular to the opening 13 (the direction perpendicular to the plane of FIG. 3), and the tungsten wire below the upper surface of the upper tungsten wire 100 (for example, the warp yarn 11). It is the distance to the lower surface of 100 (for example, weft yarn 12).

  As shown in FIG. 8, the surface roughness Ra increases as the elapsed time from the initial state becomes longer. That is, it can be seen that the surface roughness Ra can be increased by increasing the contact time between the screen mesh 10a and the drug. Therefore, the desired surface roughness Ra can be achieved by designing an appropriate contact time. On the other hand, the film thickness of the screen mesh 10a is substantially constant regardless of the elapsed time.

  From the above, it is possible to increase the surface roughness Ra of the warp yarn 11 and the weft yarn 12 while keeping the film thickness of the screen mesh 10a substantially constant. Thereby, it is possible to improve the retention of the emulsion while maintaining the strength of the screen mesh 10a.

[Effects, etc.]
Hereinafter, the effects of the screen mesh 10 or 10a and the tungsten wire 100 will be described including the background to the present invention.

  Conventionally, a screen mesh for screen printing has been manufactured using a stainless steel wire (SUS wire). However, since the strength of the stainless steel wire is not sufficient, the screen mesh made of stainless steel wire has a problem that it is stretched when pushed into the squeegee and the shape of the mesh (opening) is deformed.

  Therefore, the present inventors examined the production of a screen mesh using a material having higher strength. Specifically, the present inventors have focused on tungsten as a material having a high strength and studied to manufacture a screen mesh. The tungsten wire has a hardness of about 4 times that of the stainless steel wire and a tensile strength of about 1.3 times that of the stainless wire. As described above, the tungsten wire is stronger than the stainless wire and is not easily stretched. Therefore, the screen mesh made using the tungsten wire is prevented from being deformed when being pushed into the squeegee. Therefore, screen printing can be performed with high accuracy.

  By the way, the screen mesh is required to have a holding power for emulsion forming a printing pattern in screen printing. When the holding power of the emulsion by the screen mesh is weak, the shape of the patterned emulsion is broken and the accuracy of screen printing is lowered.

  Therefore, the method of manufacturing the screen mesh 10 or 10a according to the present embodiment includes a step of forming a screen mesh 10 or 10a (metal mesh) for screen printing using a plurality of tungsten wires 100, Forming irregularities on the surfaces of the plurality of tungsten wires 100 (warp yarn 11 and weft yarn 12) constituting the screen mesh 10 or 10a.

  Thereby, since the screen mesh 10 or 10a is networked using the tungsten wire 100, the strength of the screen mesh 10 or 10a can be increased.

  Further, since the unevenness is formed on the surface of the tungsten wire 100 constituting the screen mesh 10 or 10a, that is, the surface of the warp yarn 11 and the weft yarn 12, the emulsion is easily held by the formed fine unevenness. Therefore, the retention of the emulsion by the screen mesh 10 or 10a can be increased.

  Further, since the formation of the micro unevenness (that is, roughening) is performed after the screen mesh 10 or 10a is made, the surface of the tungsten wire used for making the mesh is excellent (specifically, the surface roughness). Tungsten wire 100 (Ra is sufficiently small) can be used. Accordingly, it is possible to suppress the occurrence of disconnection in the net making and the wear of equipment such as the cage of the net making apparatus.

  In addition, for example, the method for manufacturing the screen mesh 10a further includes a step of rolling the screen mesh 10 that has been reticulated, and in the forming step, irregularities are formed after the rolling step.

  Thereby, since the screen mesh 10a is rolled, the fixing strength between the warp yarn 11 and the weft yarn 12 increases. Therefore, even if it is a case where it pushes in with a squeegee etc., since the shape of the opening 13 is suppressed, the precision of screen printing can be improved.

  Further, for example, in the forming step, the unevenness is formed by bringing the drug into contact with the screen mesh 10 or 10a.

  Thereby, the screen mesh 10 or 10a can be roughened by a simple process of bringing the screen mesh 10 or 10a into contact with the medicine. Moreover, desired surface roughness can be achieved by controlling the component concentration of the drug and the contact time with the drug.

  By the way, the tungsten wire has a problem that its surface is rough. When a net is made using a tungsten wire having a rough surface, the equipment such as the net making apparatus (loom) is worn heavily. Specifically, the parts (specifically, the hook that holds the tungsten wire) provided in the netting device are consumed due to wear, and the replacement frequency increases. Moreover, not only the wear of the equipment at the time of the net making but also the tungsten wire is cracked when rolled after the net making.

  Furthermore, as a result of intensive studies to suppress wear of equipment during netting and cracking of tungsten wires during rolling, the inventors have sufficiently improved the surface properties of tungsten wires to solve these problems. I was able to solve it.

  Below, the result of having evaluated the generation | occurrence | production of the disconnection in a net making and the abrasion of facilities, such as a cage | basket of a net making apparatus, with respect to several tungsten wires from which surface roughness Ra differs is demonstrated. Here, five types of tungsten wires having surface roughness Ra of 0.04 μm, 0.07 μm, 0.10 μm, 0.12 μm, and 0.15 μm were evaluated. FIG. 9 is a diagram showing an evaluation result of the tungsten wire 100 according to the present embodiment.

  As shown in FIG. 9, when a net was made using a tungsten wire having a surface roughness Ra of 0.10 μm or less, disconnection and equipment wear hardly occurred. On the other hand, when a net was made using a tungsten wire having a surface roughness Ra of 0.12 μm and 0.15 μm, it was confirmed that disconnection and equipment wear occurred. Specifically, when a net was made using a tungsten wire having a surface roughness Ra of 0.15 μm, breakage occurred in about 20% of the warp yarn. In addition, when a net was made using a tungsten wire having a surface roughness Ra of 0.15 μm, the wrinkles for holding the warp yarn were severely worn.

  From the above, in the method of manufacturing the screen mesh 10 or 10a according to the present embodiment, for example, the surface roughness Ra of the tungsten wire 100 used in the net making process is 0.10 μm or less, and the screen mesh 10 is The surface roughness Ra of the warp yarn 11 and the weft yarn 12 is larger than 0.10 μm.

  Thereby, wear of the net making apparatus can be suppressed by using the tungsten wire 100 having a sufficiently high surface property such that the surface roughness Ra is 0.10 μm or less. In addition, since the sliding of the tungsten wire 100 is improved, the workability of the net is improved. Specifically, the warp yarn 11 and the weft yarn 12 are prevented from being distorted and displaced, and the screen mesh 10 having a plurality of openings 13 having a uniform shape in the plane can be made.

  Furthermore, since the irregularities (cracks) on the surface of the tungsten wire 100 are reduced, it is possible to suppress the occurrence of cracks in the tungsten wire 100 during rolling after netting. For this reason, since the occurrence of disconnection of the tungsten wire 100 is reduced, a decrease in the yield of the screen mesh 10 can be suppressed.

  Further, since the surface roughness Ra of the warp yarn 11 and the weft yarn 12 after the net making is larger than 0.10 μm, the emulsion can be held on the surface unevenness. Therefore, the retention of the emulsion by the screen mesh 10 can be increased.

  In addition, for example, the tensile strength of the tungsten wire 100 used in the net making process is 3700 MPa or more and 4200 MPa or less.

  Thereby, since the tensile strength of the tungsten wire 100 is 3700 MPa or more and is high, the durability of the screen mesh 10 can be enhanced. Specifically, even when the squeegee 31 is pushed in during screen printing, disconnection of the tungsten wire 100 can be suppressed. Moreover, since the tensile strength of the tungsten wire 100 is 4200 MPa or less and is not too high, the tungsten wire 100 can be prevented from being too hard and cracked.

  For example, the drooping length in the case where the length of the tungsten wire 100 used in the netting process is 1000 mm is 900 mm or more.

  Thereby, since the straightness of the tungsten wire 100 is sufficiently high, it is possible to suppress the occurrence of disconnection during the net making. Accordingly, it is possible to suppress a decrease in the yield of the screen mesh 10 made with the tungsten wire 100.

  In addition, for example, the wire diameter of the tungsten wire 100 used in the net making process is 22 μm or less.

  Thereby, since the wire diameter of the tungsten wire 100 is 22 micrometers or less, the flexibility of the tungsten wire 100 is high and it becomes easy to bend. Therefore, the workability of the net can be improved. Moreover, since the wire diameter of the tungsten wire 100 is 22 μm or less, the durability of the screen mesh 10 made of the tungsten wire 100 can be improved. Therefore, even when repeatedly used for screen printing, the occurrence of the collapse of the mesh (opening 13) is suppressed, and high-accuracy screen printing can be performed.

(Embodiment 2)
Next, the second embodiment will be described.

  In Embodiment 1, although the example which uses a metal mesh as the screen mesh 10 for screen printing was shown, the use of a metal mesh is not limited to this. In the present embodiment, a metal mesh used for radioactive substance adsorption and recovery will be described.

  Below, it demonstrates centering on difference with Embodiment 1, and abbreviate | omits or simplifies description about the same point.

[Constitution]
FIG. 10 is an external view of the metal mesh 110 according to the present embodiment. In FIG. 10, the mesh is illustrated only on a part of the metal mesh 110, but the entire metal mesh 110 has a mesh shape.

  The metal mesh 110 according to the present embodiment is made of a net using a plurality of tungsten wires 100. The woven structure of the metal mesh 110 is, for example, a twill (specifically, four twills having a 2/2 twill structure). Specifically, the metal mesh 110 is formed by two tungsten wires 100 constituting the warp yarn 111 and a plurality of tungsten wires 100 constituting the weft yarn 112 alternately intersecting each other.

  The specific configuration of the metal mesh 110 is substantially the same as that of the screen mesh 10 according to the first embodiment. The difference is that each of the warp yarn 111 and the weft yarn 112 is not a single wire of the tungsten wire 100 but is formed of a tungsten wire 100 (tungsten fiber) in which fibers are woven.

  FIG. 11 is a schematic diagram of a tungsten fiber 120 used for making the metal mesh 110 according to the present embodiment. Specifically, the tungsten fiber 120 corresponds to each of a plurality of warp yarns 111 and a plurality of weft yarns 112 constituting the metal mesh 110.

  The tungsten fiber 120 is a composite wire including the tungsten wire 100 and a chemical fiber. Specifically, the tungsten fiber 120 is a metal fiber around which a false twisted yarn 121 made of a chemical fiber is wound with the tungsten wire 100 as a core wire. The metal mesh 110 shown in FIG. 10 is made by using the tungsten fiber 120 shown in FIG. 11 as the warp yarn 111 and the weft yarn 112.

  The false twisted yarn 121 is an example of a fiber woven into the tungsten wire 100, and is made of, for example, a chemical fiber. As the chemical fiber constituting the false twisted yarn 121, for example, synthetic fiber such as polyester, acrylic or nylon is used. The chemical fibers are not limited to synthetic fibers, but may be regenerated fibers such as rayon, or semi-synthetic fibers. Moreover, you may use a natural fiber as the false twisted yarn 121 instead of a chemical fiber.

  In the present embodiment, an adsorbent that adsorbs a radioactive substance is attached to the false twisted yarn 121. The adsorbent is, for example, Prussian blue, but is not limited thereto.

Prussian blue is a blue artificial pigment called bitumen. A general composition formula of Prussian blue is represented by A _y Fe [Fe (CN) ₆ ] _x · zH ₂ O. “A” in the composition formula is a metal cation such as cesium ion (Cs ⁺ ). “X”, “y”, and “z” in the composition formula are predetermined constants. Prussian blue is a kind of substance group called a metal complex or a coordination polymer, and has a structure having a plurality of voids inside a microcrystal having a particle size of 10 nm or less. Prussian blue has the property of selectively adsorbing cesium ions by incorporating cesium into the voids.

[Production method]
Then, the manufacturing method of the metal mesh 110 which concerns on this Embodiment is demonstrated. FIG. 12 is a flowchart showing a method for manufacturing the metal mesh 110 according to the present embodiment.

  As shown in FIG. 12, first, the adsorbent that adsorbs the radioactive substance is held on the plurality of tungsten wires 100 (S8). Specifically, Prussian blue is attached to each of the plurality of tungsten wires 100.

  In the present embodiment, a fiber (false twisted yarn 121) is woven into each of the plurality of tungsten wires 100, and Pullshan blue is attached to the woven fiber. For example, by applying a paint containing Prussian blue to the tungsten wire 100 in which the false twisted yarn 121 is woven, the Prussian blue is attached to the false twisted yarn 121. Alternatively, false twisted yarn 121 may be impregnated with Prussian blue. That is, the false twisted yarn 121 to which Pullshan blue is previously attached may be woven into the tungsten wire 100.

  Here, instead of the fiber woven into the tungsten wire 100 (false twisted yarn 121), the Pullshan blue may be directly attached to the surface of the tungsten wire 100. For example, a paint containing Prussian blue may be applied to each surface of the plurality of tungsten wires 100.

  Alternatively, when the tungsten wire 100 is manufactured, Prussian blue may be mixed into the raw material of the tungsten wire 100. Specifically, a mixture of tungsten powder and Prussian blue may be press-molded and sintered to form an ingot. The tungsten wire 100 containing Prussian blue can be produced by performing swaging and drawing on the ingot mixture.

  Next, the metal mesh 110 is made using a plurality of tungsten wires 100 holding the Prussian blue (S10). The specific process is the same as in the first embodiment.

  As described above, in this embodiment, the Prussian blue holding step (S8) is performed before the net making step (S10). As in the first embodiment, rolling (S12) and surface roughening (S14) may be performed after netting.

[Effects, etc.]
Conventionally, when nuclear fuels such as uranium and plutonium are used in nuclear power plants, radioactive materials such as cesium and cobalt are generated as fission products. Since radioactive substances adversely affect the human body and the environment, it is desired to collect them quickly and efficiently so that they do not leak to the outside.

  As described above, Prussian blue adsorbs cesium or the like, which is a radioactive substance, so that cesium can be easily recovered. However, since the Prussian blue adsorbing cesium becomes a radiation emission source, it becomes difficult to collect the Prussian blue.

  Thus, as a result of intensive studies, the inventors have found that the radioactive material can be efficiently recovered using tungsten fibers and Prussian blue. Specifically, the tungsten fiber 120 according to the present embodiment includes a tungsten wire 100 and an adsorbent that is held by the tungsten wire 100 and adsorbs a radioactive substance. Here, the adsorbent is, for example, Prussian blue.

  Generally, since tungsten has a high specific gravity, it has a radiation shielding effect. Specifically, gamma rays are attenuated when gamma rays pass through tungsten. Therefore, by surrounding the radioactive substance with tungsten, radiation from the radioactive substance can be suppressed from being emitted to the outside.

  In the present embodiment, since the Prussian blue is held by the tungsten wire 100, the radiation emitted from the radioactive material such as cesium absorbed by the Prussian blue is caused by the tungsten wire 100 adjacent to the Prussian blue. Shielded. That is, the metal mesh 110 can adsorb the radioactive substance with Prussian blue, and can suppress the radiation from the adsorbed radioactive substance from being released to the outside. Therefore, the radioactive substance can be recovered together with the metal mesh 110.

  For example, the tungsten fiber 120 further includes a fiber (specifically, false twisted yarn 121) woven into the tungsten wire 100, and the adsorbent is attached to the fiber.

  Thereby, since the false twisted yarn 121 is woven in the tungsten wire 100, the surface area of the tungsten fiber 120 can be increased. Since the adhesion area of Prussian blue is increased, the adsorptive power of radioactive substances can be increased.

  Further, for example, in the tungsten fiber 120, the adsorbent is attached to the surface of the tungsten wire 100.

  Thereby, since the Pursian blue is attached to the surface of the tungsten wire 100, the tungsten wire 100 can efficiently attenuate the radiation emitted from the radioactive material adsorbed by the Pursian blue. Therefore, the radiation shielding effect by the tungsten fiber 120 can be enhanced. Further, when the surface of the tungsten wire 100 is roughened, the surface area of the tungsten wire 100 can be increased, so that the adhesion area of Prussian blue can be increased.

  In addition, the method of manufacturing the metal mesh 110 according to the present embodiment further includes a step (S8) of holding an adsorbent (specifically, Prussian blue) that adsorbs a radioactive substance on the plurality of tungsten wires 100. . Further, for example, the holding step (S8) is performed before the net making step (S10).

  As a result, cesium or the like can be adsorbed by Prussian blue, and radiation emitted from the adsorbed cesium or the like is shielded by the tungsten wire 100. Therefore, the radioactive material can be easily recovered using the metal mesh 110.

  Further, for example, in the holding step (S8), fibers (specifically, false twisted yarn 121) are woven into each of the plurality of tungsten wires 100, and an adsorbent is attached to the woven fibers.

  Thereby, since the false twisted yarn 121 is woven into the tungsten wire 100, the surface area of the metal mesh 110 can be increased. Since the adhesion area of Prussian blue is increased, the adsorptive power of radioactive substances can be increased.

[Modification]
Below, the modification of the metal mesh 110 and the tungsten fiber 120 which concerns on this Embodiment is demonstrated.

  For example, in the present embodiment, the false twisted yarn 121 is woven into the tungsten wire 100, and Prussian blue is attached to the woven false twisted yarn 121. However, the present invention is not limited to this. An adsorbent such as Prussian blue may be applied directly to the surface of the tungsten wire 100.

  FIG. 13 is a flowchart showing a method for manufacturing a metal mesh according to this modification.

  As shown in FIG. 13, a net making process (S10) and a roughening process (S14) are performed. These steps are substantially the same as those in the first embodiment. Specifically, in the net making process (S10), a metal mesh (screen mesh 10 shown in FIGS. 1 and 2) is made using the tungsten wire 100 in which the false twisted yarn 121 is not woven.

  In the net making step (S10), a metal mesh may be made using a plurality of tungsten wires 100 each woven with fibers (false twisted yarn 121). In the example shown in FIG. 13, the rolling step (S12) is omitted, but the rolling step may be performed.

  Next, the Prussian blue is held on the plurality of tungsten wires 100 (S16). Specifically, Prussian blue is applied to the surfaces of the plurality of tungsten wires 100. For example, by immersing a meshed metal mesh in a paint containing Prussian blue, the Prussian blue is applied to the entire surface of the metal mesh. Alternatively, a paint containing Prussian blue may be sprayed on the metal mesh using a sprayer or the like.

  As described above, for example, in the metal mesh manufacturing method according to the present modification, the holding step (S16) is performed after the net making step (S10).

  Thereby, when using for the collection | recovery use of a radioactive substance, the adsorption | suction power of a radioactive substance can be given to a metal mesh as needed. Further, since the Prussian blue is retained after the metal mesh is made, the metal mesh before retaining the Pursian blue can be used for purposes other than the collection of radioactive substances (for example, screen printing). That is, the versatility of the metal mesh can be enhanced. Moreover, cost reduction can be realized by mass-producing metal meshes that can be used for different purposes.

  In the present modification, the holding step (S16) is performed after the roughening step (S14). By roughening the surface of the tungsten wire 100, the adhesion area of Prussian blue increases. Therefore, the adsorptive power of radioactive substances can be increased.

  The present invention is not limited to the metal mesh as long as it is a textile product using the tungsten wire 100 holding an adsorbent such as Prussian blue. For example, the fiber product may be a fiber fabric such as a woven fabric, a knitted fabric, or a non-woven fabric using the tungsten fiber 120 as a raw yarn. The shape of the fiber fabric is, for example, a cloth shape or a sheet shape, but is not limited thereto. For example, the tungsten fibers 120 may be gathered into a cotton shape (cotton shape).

  In addition, for example, the tungsten fiber 120 is not limited to the configuration shown in FIG. 11, but may be a twisted or aligned strand of the tungsten wire 100 and a chemical fiber.

  Further, for example, the tungsten fiber 120 is not limited to the composite wire of the tungsten wire 100 and the false twisted yarn 121 but may be a single wire of the tungsten wire 100 holding an adsorbent such as Prussian blue.

  Further, for example, in the present embodiment, an example in which the tungsten wire 100 is made is shown, but the present invention is not limited thereto. For example, a plurality of tungsten wires 100 having a surface coated with Prussian blue may be simply twisted or aligned.

  In the present embodiment, as shown in FIG. 12, the tungsten wire 100 need not be roughened.

(Other)
As mentioned above, although the manufacturing method of the metal mesh which concerns on this invention was demonstrated based on embodiment, this invention is not limited to said embodiment.

  For example, in the above-described embodiment, the screen mesh 10 or 10a and the drug are brought into contact with each other by immersing the screen mesh 10 or 10a made in the net in the drug, but the present invention is not limited thereto. You may spray a chemical | medical agent using the atomizer etc. with respect to the screen mesh 10 or 10a made into a net.

  In addition, for example, the method of roughening the screen mesh 10 or 10a made of a net is not limited to chemical treatment. For example, the screen mesh 10 or 10a may be roughened by shot blasting.

  Further, for example, in the above embodiment, the numerical values of the tensile strength, the hanging length, and the wire diameter of the tungsten wire 100 are illustrated, but the numerical values are not limited thereto. For example, the tensile strength of the tungsten wire 100 may be larger than 4200 MPa or smaller than 3700 MPa. For example, the drooping length when the length of the tungsten wire 100 is 1000 mm may be shorter than 900 mm. The wire diameter of the tungsten wire 100 may be larger than 22 μm.

  In addition, it is realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, and forms obtained by making various modifications conceived by those skilled in the art to each embodiment. Forms are also included in the present invention.

10, 10a Screen mesh (metal mesh)
100 Tungsten wire 110 Metal mesh 120 Tungsten fiber 121 False twisted yarn (fiber)

Claims (13)

Forming a metal mesh using a plurality of tungsten wires;
And a step of forming irregularities on the surfaces of the plurality of tungsten wires constituting the meshed metal mesh. further,
Rolling a netted metal mesh,
The method for producing a metal mesh according to claim 1, wherein in the forming step, the unevenness is formed after the rolling step. The method for producing a metal mesh according to claim 1, wherein, in the forming step, the unevenness is formed by bringing a drug into contact with the metal mesh. The surface roughness Ra of the tungsten wire used in the netting step is 0.10 μm or less,
The method for producing a metal mesh according to any one of claims 1 to 3, wherein a surface roughness Ra of the tungsten wire constituting the metal mesh is larger than 0.10 µm. The method for producing a metal mesh according to any one of claims 1 to 4, wherein the tensile strength of the tungsten wire used in the step of making a net is 3700 MPa or more and 4200 MPa or less. The method for producing a metal mesh according to any one of claims 1 to 5, wherein a drooping length when the length of a tungsten wire used in the netting process is 1000 mm is 900 mm or more. The method for producing a metal mesh according to any one of claims 1 to 6, wherein a wire diameter of the tungsten wire used in the netting process is 22 µm or less. The method for producing a metal mesh according to claim 1, wherein the metal mesh is a screen mesh for screen printing. further,
The manufacturing method of the metal mesh of any one of Claims 1-7 including the process of hold | maintaining the adsorbent which adsorb | sucks a radioactive substance to these tungsten wires. The method for producing a metal mesh according to claim 9, wherein the holding step is performed before the net making step. The method for producing a metal mesh according to claim 10, wherein in the holding step, fibers are woven into each of the plurality of tungsten wires, and the adsorbent is attached to the woven fibers. The metal mesh manufacturing method according to claim 9, wherein the holding step is performed after the net making step. The method for producing a metal mesh according to any one of claims 9 to 12, wherein the adsorbent is Prussian blue.

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