JP2006073789A - Knitting sheet for electromagnetic wave shielding and molding for electromagnetic shielding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a knitting sheet for electromagnetic wave shielding that enables easy integrated molding with resin, and ensures a sufficient electromagnetic wave shielding characteristic and a cubic resin molding employing the knitting sheet, in forming a 3-dimensional cubic resin molding with the electromagnetic wave shielding property. <P>SOLUTION: This knitting sheet is produced by knitting metal wires and synthetic fiber strings arranged in parallel. Owing to the elasticity of synthetic fiber strings, the knitting sheet is provided with characteristics such as flexibility, high extensibility for stitch deformation particular to knit, and an electromagnetic wave shielding characteristic. The flexibility and the extensibility of the knitting sheet significantly simplify integrated molding in molding a 3-dimensional cubic resin molding, and generate the 3-dimensional cubic molding with an electromagnetic wave shielding characteristic in a complicated form. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic wave shielding member for shielding an electromagnetic wave from an electromagnetic wave generator and an electromagnetic wave shielding molded body.

  In recent years, with the widespread use of various electronic devices, there are concerns about the adverse effects of electromagnetic waves generated from these devices on living organisms and the effects of malfunctions on other electronic products. And the electromagnetic shielding material is widely used as the countermeasure.

  As a main production method of the electromagnetic wave shielding material, a method using a metal material, a method of applying a conductive paint, a method of forming a metal film by plating or sputtering, a method of kneading a conductive material into a resin, For example, a method of forming a conductive film by adhering an electromagnetic shielding sheet or a wire mesh is used.

  However, when electromagnetic wave shielding processing is performed on a three-dimensional three-dimensional molded product having irregularities and curved surfaces, the metal material not only increases the weight, but also increases the number of processing steps, increasing productivity and manufacturing costs, etc. There are difficulties.

  In addition, it is difficult to uniformly form a coating film or a film in a complicated three-dimensional shape by applying a conductive paint or forming a metal film by plating or sputtering. There are various problems in terms of electromagnetic wave shielding performance, durability, mass productivity, and manufacturing cost, such as insufficient adhesion strength of molded products and partial peeling.

  In addition, the method of imparting conductivity to the molded product itself by kneading the conductive material into the resin is advantageous in that it is rich in mass productivity and can shorten the work process. It is necessary to increase the content of the conductive material, and there are problems in resin strength, moldability, manufacturing cost, and the like. Further, it is difficult to bond a sheet or a wire net to a three-dimensional three-dimensional molded product so as not to cause wrinkles or creases.

  Further, most of the electromagnetic wave generators are exothermic, and the electromagnetic wave shielding material covering the electromagnetic wave generators often requires a large number of holes for heat dissipation. The hole for heat dissipation needs to have a sufficient aperture ratio that does not accumulate generated heat, and has a filter function so that dust such as dust does not enter inside from the hole.

  The provision of such a filter function makes problems such as the number of manufacturing steps, moldability, resin strength, and manufacturing cost in the conventional technology more difficult.

  As the electromagnetic wave shielding material having such a filter function, a nonwoven fabric such as carbon fiber is used. However, since the heat radiation performance is not sufficient, it is difficult to use the electromagnetic wave generator when it is exothermic.

  As a method for solving the above problems, there has been proposed a method for providing a flexible electromagnetic wave shielding sheet by using a knitted fabric made of a chemical fiber and a metal fiber-plated yarn (see, for example, Patent Document 1). ).

In addition, after knitting the fabric, a conductive film is applied to the surface of the fabric to form an electromagnetic shielding sheet, thereby preventing wrinkles when the electromagnetic shielding sheet and the synthetic resin molding are integrated. There has been proposed an electromagnetic wave shield that can be used (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 11-97885 JP 2000-49489 A

  However, in the method of using a synthetic fiber and a yarn obtained by applying metal plating to the synthetic fiber as a knitted fabric, since a synthetic fiber with metal plating is knitted, the peeling of plating during knitting and when tension is applied during molding Peeling becomes a problem.

  Further, since the metal is only the plated portion, increasing the synthetic yarn yields a high degree of flexibility. However, increasing the synthetic yarn in order to obtain the flexibility has a drawback that the electromagnetic wave shielding performance becomes poor.

  In addition, after the yarn is knitted, the conductive yarn is applied to the surface of the fabric to form an electromagnetic wave shielding sheet. Therefore, there is a problem of peeling of the conductive film, and the electromagnetic wave shielding performance is inferior to that of the electromagnetic wave shielding sheet using the metal thread.

  The present invention has been made to solve such a conventional problem, and in the production of a three-dimensional three-dimensional resin molded body having electromagnetic wave shielding properties, the number of steps is small and integral molding with a resin is easy. An object of the present invention is to provide an electromagnetic wave shielding knitted sheet having sufficient electromagnetic wave shielding properties and a filter function, and a three-dimensional resin molding excellent in adhesion to a resin using the electromagnetic wave shielding knitted sheet.

  A first invention is an electromagnetic wave shielding knitted sheet comprising a knitted fabric in which conductive metal yarns and nonconductive synthetic yarns are knitted in parallel.

  The second invention is the electromagnetic wave shielding knitted sheet according to the first invention, wherein the knitted fabric is knitted by weft knitting.

  The third invention is characterized in that, in the first or second invention, the metal yarn contains at least one selected from copper, silver, nickel, tin, or stainless steel as a component thereof. A knitted sheet for shielding electromagnetic waves.

  The fourth invention is the electromagnetic wave shielding knitted sheet according to any one of the first to third inventions, wherein the metal yarn has a yarn diameter of 10 to 100 μm.

  According to a fifth aspect of the present invention, there is provided the electromagnetic wave shielding knitted sheet according to any one of the first to fourth aspects, wherein the synthetic fiber has a yarn diameter of 20 to 200 μm.

  The sixth invention is the electromagnetic wave shielding knitted sheet according to any one of the first to fifth inventions, wherein the knitted fabric is formed to have an aperture ratio of 10 to 80%.

  The seventh invention is the electromagnetic wave shielding knitted sheet according to any one of the first to sixth inventions, wherein a metal thin film is formed on at least a part of the surface of the knitted fabric.

  An eighth invention is an electromagnetic wave shielding molded body, wherein the electromagnetic shielding knitted sheet of any of the first to seventh inventions and a three-dimensional molded body made of resin are integrally molded. is there.

  The knitted sheet for electromagnetic wave shielding of the present invention has flexibility not found in the conventional electromagnetic wave shielding sheet by knitting conductive metal and synthetic fiber in parallel, and by the flexibility, when integrally molding with resin A three-dimensional three-dimensional resin molding can easily have high adhesion.

  Below, each embodiment of the knitted sheet for electromagnetic wave shielding of this invention is described with reference to figures.

  FIG. 1 is a schematic view of an electromagnetic wave shielding knitted sheet according to the first embodiment of the present invention. In this figure, the black line represents the conductive metal yarn 1, and the dotted line represents the non-conductive synthetic fiber 2.

  The electromagnetic shielding knitted sheet 10 of the present embodiment has the metal yarn 1 and the synthetic yarn 2 arranged one by one in parallel, and the two are knitted into a flat knitting called a single knitting or a tengu knitting at the same time. It is formed. Flat knitting is a basic form of knitting, and since it is easy to knit, mass production can be performed easily and quickly regardless of the type of knitting machine.

  FIG. 2 is a schematic view of a knitted sheet for shielding electromagnetic waves according to a second embodiment of the present invention. In this figure, the black line represents the conductive metal yarn 1, and the dotted line represents the non-conductive synthetic fiber 2.

  The electromagnetic shielding knitted sheet 20 of the present embodiment has a metal yarn 1 and a synthetic yarn 2 arranged in parallel one by one, and the two are simultaneously called “smooth knitting”, “meridian knitting”, “interlock knitting”, and “double rib knitting”. It is formed by knitting.

  Double-sided knitting is two-dimensional because the eyes are dense and the front and back sides are relatively smooth even when the number of gauges is the same as plain knitting (referring to the number of knitting needles between 1 inch (2.54 cm)). It is suitable for a three-dimensional resin molded body close to two dimensions.

  FIG. 3 is a schematic view of a knitted sheet for shielding electromagnetic waves according to a third embodiment of the present invention. In this figure, the black line represents the conductive metal yarn 1, and the dotted line represents the non-conductive synthetic fiber 2.

  The electromagnetic shielding knitted sheet 30 of the present embodiment has a metal yarn 1 and a synthetic yarn 2 arranged one by one in parallel, and the two are knitted at the same time by rib knitting, commonly called milling knitting, rubber knitting, and knit knitting. It is formed.

  A knitted fabric knitted by rib knitting has a feature that it stretches particularly well in the horizontal direction in the figure.

  Also, unlike flat knitting, since the ears are not wound, it is easy to cut, and it is suitable when three-dimensional solid resin molding is desired in one direction like pleats.

  FIG. 4 is a schematic view of a knitted sheet for shielding electromagnetic waves according to a fourth embodiment of the present invention. In this figure, the black line represents the conductive metal yarn 1, and the dotted line represents the non-conductive synthetic fiber 2.

  The electromagnetic wave shielding knitted sheet 40 of the present embodiment has metal yarns 1 and synthetic yarns 2 arranged in parallel one by one, and the two are simultaneously called by the names of link knitting, links / links knitting, garter knitting, and double-headed knitting. It is formed by knitting with pearl knitting.

  Since this is a thicker fabric than the flat knitting example, it well shields low-frequency electromagnetic waves.

  These flat knitting, double-sided knitting, rib knitting, and pearl knitting are collectively called weft knitting, and there are also warp knitting such as tricot and russell, but the high elasticity that is characteristic of knitting by weft knitting is electromagnetic shielding Particularly suitable for knitted fabric sheets.

  Usually, weft knitting often uses a circular knitting machine. This is because the size of the machine is compact compared to other knitting machines, the productivity is high, and even complicated knitting shapes can be handled immediately.

  Among the reasons described above, in particular, the use of a circular knitting machine has the great advantage that a wide knitted fabric can be easily formed with a compact knitting machine without requiring a large machine. That is, it is useful when a large three-dimensional resin molded product or a large number of three-dimensional resin molded products are produced simultaneously.

  Each embodiment of the present invention is characterized in that conductive metal yarns and non-conductive synthetic yarns are knitted in parallel, but the number of conductive metal yarns arranged in parallel and the non-conductive synthetic yarns There is no particular limitation on the combination of the number of fibers, one metal yarn and one synthetic yarn, one synthetic yarn for a plurality of metallic yarns, one synthetic yarn for a plurality of metallic yarns, and a plurality of metallic yarns. A plurality of synthetic yarns may be combined to form a knitted fabric.

  By knitting metal yarn and synthetic yarn in parallel, the amount of metal yarn and synthetic yarn per unit area is doubled compared to, for example, a knitted fabric in which metal yarn and synthetic yarn are alternately knitted. , Both are excellent.

  Although the electromagnetic shielding performance depends on the specific physical properties of the metal yarn, it is preferable to use a plurality of metal yarns from the viewpoint of the electromagnetic shielding performance as long as they are the same material. In addition, flexibility and shape restoration when a knitted fabric is a characteristic imparted by the elasticity of the synthetic yarn, and by using a plurality of synthetic yarns, it is possible to draw out this characteristic more strongly.

  The metal yarn used for the electromagnetic wave shielding knitted sheet of the present embodiment is a single metal or metal material such as an alloy formed into a yarn shape. In addition, the material of the metal yarn used for the electromagnetic shielding knitted sheet of the present embodiment is at least one of copper, nickel, tin, stainless steel, silver, titanium, graphite, zinc-containing alloy, indium oxide, amorphous metal, and the like. It is contained in the component. In particular, copper, silver, nickel, tin, stainless steel and the like are preferable because they have high electromagnetic shielding properties.

  In view of cost, chemical stability, and electromagnetic wave shielding performance, an alloy of stainless steel and tin is particularly preferable.

  In addition, the synthetic yarn that has been subjected to metal plating or the like is not used in the present invention because the plated part may be peeled off, but the core part is synthetic fiber and the sheath part is metal, or the core part is metal and the core In the case of a composite yarn having a core-sheath structure in which the portion is a synthetic fiber, it can be used because it is more resistant to bending and friction than a plated yarn.

  Furthermore, the metal yarn may be a single wire, a plurality of single wires may be used, or a yarn threaded with a plurality of single wires may be used.

  The wire diameter of the metal yarn is preferably 10 to 100 μm. This is because if the wire diameter is less than 10 μm, the strength of the yarn is weak, so that yarn breakage occurs during knitting, or the strength of the knitted fabric is weak and the durability becomes poor.

  If the wire diameter (diameter of wire) is larger than 100 μm, knitting becomes difficult. At the same time, in the metal yarn of the obtained knitted sheet, current generated by electromagnetic waves is concentrated on the metal surface due to the skin effect of current. This is because it is difficult to obtain a considerable amount of electromagnetic wave shielding performance despite the fact that the internal current becomes small and the cross-sectional area is large.

  Synthetic yarn materials used include general synthetic yarns such as polyester, nylon, polyethylene, vinylon, acrylic, polyvinyl chloride, and vinylidene, as well as Kevlar (registered trademark), Technora (registered trademark), PBO, Beckley (registered trademark), and Techmylon. Any kind of high-strength fiber such as (registered trademark) can be used.

  Further, since the synthetic yarn is used for the purpose of imparting flexibility to the knitted fabric, its cross section is not limited to a circular shape, and the shape such as a hollow yarn or a modified cross sectional yarn is not particular.

  Furthermore, the synthetic yarn may be a single wire (commonly known as a monofilament), a plurality of single yarns (commonly referred to as a multifilament), or a yarn that is applied with a plurality of single yarns.

  However, in the case of the same material and geometrically the same wire diameter, the monofilament has higher rigidity than the multifilament, and therefore the monofilament is suitable for the electromagnetic shielding knitted sheet of each embodiment of the present invention. is there.

  The wire diameter of the synthetic yarn is preferably 20 to 200 μm. This is because when the wire diameter is less than 20 μm, the strength of the yarn is weak, as with metal yarns, so yarn breakage may occur during knitting, and the strength of the knitted fabric is weak, resulting in poor durability. Conversely, the wire diameter is 200 μm. This is because knitting is difficult in a larger case.

  Moreover, although a living machine may be used for the knitted sheet for shielding electromagnetic waves of each embodiment of the present invention, smoothness may be given by post-processing or elongation may be stabilized. At that time, the aperture ratio of the electromagnetic shielding knitted sheet of each embodiment of the present invention can be appropriately changed according to the filter condition of the electromagnetic shielding molded product.

  Here, the aperture ratio is preferably between 10 and 80%. This is because it is difficult to make a knitted fabric with an aperture ratio of less than 10%, and even if knitting can be performed, if the molded body is a heating element, the heat dissipation becomes worse. Also, if the aperture ratio is greater than 80%, the filter effect will be lacking. Furthermore, considering the balance between heat dissipation and filter effect, the aperture ratio is preferably 30 to 70%. Here, the aperture ratio means the ratio of the light transmission area per unit area when light is projected from above the sheet.

  When the knitted electromagnetic shielding sheet is knitted with a circular knitting machine, it is cut into a single sheet by a dedicated cutting machine. The knitted raw machine may be used as it is, but it is desirable to obtain a smooth and stable knitted sheet by heat setting. Heat set is a process that applies high heat while applying tension to the raw machine, and takes round knitting and adjusts the vertical and horizontal elongation.

  Furthermore, in order to improve the electromagnetic wave shielding performance, the surface of the electromagnetic wave shielding sheet may be sputtered to form a metal (conductor) thin film, but in this case, the flexibility characteristic of the knitted fabric is impaired. It is preferable to form the film with a thin film of no degree.

  The thin film formation in this case is only for the purpose of providing an electromagnetic wave shielding effect to a sheet of knitted fabric only, and the original electromagnetic wave shielding performance effect is mainly made of metal yarn used for the knitted fabric. That is, when a thin film is formed on the electromagnetic wave shielding knitted sheet of the present invention by sputtering or plating, there is a problem that the thin film is peeled off as described above. Performance will be improved.

  The knitted sheet for electromagnetic wave shielding of each embodiment of the present invention is suitably used when electromagnetic wave shielding performance is imparted to a three-dimensional solid resin molded body. The molded body may be integrated with an original molded body with an adhesive or the like, in addition to a method of integrally molding simultaneously with the resin, such as injection molding or vacuum molding.

  FIG. 5 is a view showing an example of an electromagnetic wave shielding molded body using the electromagnetic wave shielding knitted sheet of each embodiment of the present invention.

  FIG. 5 shows a molded body 3 in which an electromagnetic wave shielding knitted sheet 10 formed by flat knitting is bonded to the inside of the back plate of a plasma display panel which is a three-dimensional molded body.

  When the knitted sheet 10 for shielding electromagnetic waves is bonded to the three-dimensional molded body 3, depending on the shape of the molded body, a considerable tension is expected to be applied particularly at the corners. Due to this tension, in the case of a knitted sheet for electromagnetic wave shielding using a plated yarn, the plated film on the surface of the yarn may be damaged, and the electromagnetic wave shielding performance may be lowered. According to the knitted sheet for electromagnetic wave shielding of each embodiment of the present invention, since the metal yarn is used without using the plating yarn, the electromagnetic wave shielding performance is deteriorated even when bonded to a three-dimensional molded body having a complicated shape. Never do.

  Molded materials are thermoplastics such as polyethylene, polypropylene, ABS (acrylonitrile butadiene styrene copolymer), polyacetal, polyamide, polycarbonate, PPS (polyphenylene sulfide), and PBT (polybutylene terephthalate). In addition, polyurethane resins, phenol resins, and thermosetting resins such as unsaturated polyesters are generally used for injection molding.

  In addition, the electromagnetic wave shielding knitted sheets 10 to 40 of the embodiments of the present invention are bonded to at least a part, preferably the entire surface, of the molded body 3. The bonding site is not limited, and may be determined in consideration of electromagnetic wave shielding performance, appearance, manufacturing method, and the like.

  Examples of each embodiment of the present invention will be described below.

Example 1
It is an Example of the knitting sheet for electromagnetic wave shielding formed by the flat knitting of 1st Embodiment of this invention. Beckley (registered trademark) 27μm monofilament yarn from Kuraray Co., Ltd. is used as synthetic fiber, and stainless steel and tin alloy 45μm monofilament yarn is made into 24 gauge flat knitting one by one in a circular knitting machine. Knitting and heat setting at 185 ° C. At this time, the width was reduced by about 10% so that the elongation was 20-30%.

(Example 2)
It is an Example of the knitting sheet for electromagnetic wave shielding formed by the flat knitting of 1st Embodiment of this invention. In order to further enhance the electromagnetic wave shielding property of the electromagnetic wave shielding knitted sheet of Example 1, vacuum sputtering was performed using a target made of a stainless steel and copper monel alloy. The film thickness at this time was an ultrathin film of 200 mm.

(Example 3)
It is an Example of the knitting sheet for electromagnetic wave shielding formed by the flat knitting of 1st Embodiment of this invention. As a synthetic yarn, two Beckley (registered trademark) 27μm monofilament yarns from Kuraray Co., Ltd., one 45μm monofilament yarn of stainless steel and tin as conductive metal, and 24 gauge flat knitting in a circular knitting machine Knitted. The subsequent production method was in accordance with Example 2.

Example 4
It is an Example of the knitting sheet for electromagnetic wave shielding formed by the flat knitting of 1st Embodiment of this invention. As synthetic fiber, one Beckley (registered trademark) 27μm monofilament yarn of Kuraray Co., Ltd., two 45μm monofilament yarns of stainless steel and tin as conductive metal, and 24 gauge flat knitting in a circular knitting machine Knitted. The subsequent production method was in accordance with Example 2.

(Example 5)
It is an Example of the knitting sheet for electromagnetic wave shielding formed by the flat knitting of 1st Embodiment of this invention. Beckley (registered trademark) 27μm monofilament yarn from Kuraray Co., Ltd. is used as synthetic fiber, and stainless steel and tin alloy 45μm monofilament yarn is made into a 15 gauge flat knitting one by one in a circular knitting machine. Knitted. The subsequent production method was in accordance with Example 2.

(Example 6)
It is an Example of the knitting sheet for electromagnetic wave shielding formed by the flat knitting of 1st Embodiment of this invention. Beckley (registered trademark) 27μm monofilament yarn from Kuraray Co., Ltd. is used as synthetic fiber, and 45μm monofilament yarn of stainless steel and tin is used as conductive metal yarn. Knitted. The subsequent production method was in accordance with Example 2.

(Comparative Example 1)
As the synthetic yarn, only Beckley (registered trademark) 27μm monofilament yarn of Kuraray Co., Ltd. was knitted into a 24 gauge flat knitting with a circular knitting machine. The subsequent production method was in accordance with Example 1.

(Electromagnetic wave shielding performance)
6 is a diagram showing the evaluation results of the sample electromagnetic wave shielding performances of Examples 1 to 6 and Comparative Example 1. FIG.

  Each sample of Examples 1-6 and Comparative Example 1 was measured for electromagnetic wave shielding performance by the KEC method defined by Kansai Electronics Industry Promotion Center. In the KEC method, a sample of an electromagnetic shielding material is installed in the middle of an electromagnetic wave generator and a receiver, and the difference between electromagnetic waves before and after passing through the electromagnetic shielding material is measured.

  The vertical axis in FIG. 6 represents the shield cutoff effect (dB), and the horizontal axis represents the frequency (MHz).

  From these results, it was confirmed that the electromagnetic wave shielding knitted sheet of each of the above Examples had sufficient electromagnetic wave shielding performance of 30 dB or more. It was also found that the electromagnetic shielding performance is higher when the number of gauges is larger and the number of metal wires is larger.

(Moldability)
7 to 10 are photographs showing the good formability of the electromagnetic shielding knitted sheet of the present invention. FIG. 7 is a photograph of a substantially cylindrical resin molded product 100, which is obtained by integrally molding the electromagnetic shielding knitted sheet of the present invention with an adhesive. FIG. 8 is a photograph of the resin molded product of FIG. 7 viewed from the side.

  As a comparative example, FIG. 9 is a photograph of a substantially cylindrical resin molded product 200 that is formed by integrally molding a polyester woven fabric with an adhesive from above. FIG. 10 is a photograph of the resin molded product of FIG. 9 viewed from the side.

  As can be seen from FIGS. 9 and 10, in the case of the conventional woven fabric and non-woven fabric, wrinkles are caused by the portions indicated by A and B in FIG. 10 of the edge portion 200a, and the resin does not enter the wrinkled portion at the time of molding. There are problems such as lack of adhesion between the sheet and the sheet, or conversely, because there is no elongation, the sheet is broken when pulled to forcibly stretch the wrinkles.

  Since the electromagnetic shielding knitted sheet of the present invention is a knitted fabric, the mesh moves freely even on a curved surface or the like, and is less likely to wrinkle. Also, unlike knitted fabrics knitted only with metal, such as a wire mesh, the synthetic yarn is knitted so that it has resilience.

It is a schematic diagram of the knitted sheet for electromagnetic wave shielding knitted by flat knitting according to the first embodiment of the present invention. It is a schematic diagram of the knitted sheet for electromagnetic wave shielding knitted by the double-sided knitting of the second embodiment of the present invention. It is a schematic diagram of the knitted sheet for electromagnetic wave shielding knitted by the rib knitting of the third embodiment of the present invention. It is a schematic diagram of the knitted sheet for electromagnetic wave shielding knitted by pearl knitting of the fourth embodiment of the present invention. It is a figure which shows what integrally molded the knitted sheet for electromagnetic wave shielding of 1st Embodiment of this invention to the resin molded product. It is a figure which shows the result of having measured the electromagnetic wave shielding performance of the knitted sheet for electromagnetic wave shielding of 1st Embodiment of this invention. It is the photograph which looked at what integrally formed the knitted sheet for electromagnetic wave shielding of this invention in the resin molding. It is the photograph which looked at what integrally formed the knitted sheet for electromagnetic wave shielding of this invention in the resin molding. It is the photograph which looked at what integrally formed the textile fabric of polyester in the resin molding. It is the photograph which looked at what formed integrally the textile fabric of the polyester in the resin molding from the side.

Explanation of symbols

1: Metal yarn 2: Synthetic yarn 10: Electromagnetic wave shielding knitted sheet knitted by flat knitting 20: Electromagnetic wave shielding knitted sheet knitted by double knitting 30: Electromagnetic wave shielding knitted sheet 40 knitted by rib knitting 40: Pearl Electromagnetic wave shielding knitted sheet 100 knitted by knitting: Electromagnetic wave shielding knitted sheet 200 affixed to a mold 200: Polyester mesh affixed to a mold

Claims (8)

An electromagnetic shielding knitted sheet comprising a knitted fabric in which conductive metal yarns and non-conductive synthetic yarns are knitted in parallel. The knitted sheet for electromagnetic wave shielding according to claim 1, wherein the knitted fabric is knitted by weft knitting. The knitted sheet for electromagnetic wave shielding according to claim 1 or 2, wherein the metal yarn contains at least one selected from copper, silver, nickel, tin, or stainless steel in its component. The knitted sheet for electromagnetic wave shielding according to any one of claims 1 to 3, wherein the metal yarn has a yarn diameter of 10 to 100 µm. The knitted sheet for shielding electromagnetic waves according to any one of claims 1 to 4, wherein a diameter of the synthetic fiber is 20 to 200 µm. The knitted sheet for electromagnetic wave shielding according to any one of claims 1 to 5, wherein the knitted fabric is formed so as to have an aperture ratio of 10 to 80%. The knitted sheet for shielding electromagnetic waves according to any one of claims 1 to 6, wherein a metal thin film is formed on at least a part of the surface of the knitted fabric. A knitted sheet for electromagnetic wave shielding according to any one of claims 1 to 7,
A molded body for electromagnetic wave shielding, which is formed by integrally molding a three-dimensional molded body made of resin.