JP2009016564A - Manufacturing method of resin molded object for shielding electromagnetic wave - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a resin molded object for shielding electromagnetic waves which can efficiently form an electromagnetic shielding layer at low cost on the face of the resin molded object to which an electromagnetic wave shielding process is applied simultaneously when the resin molded object of such as a resin housing is formed. <P>SOLUTION: A coating material layer of a conductive base material sheet is arranged at a position used as the face of the resin molded object to be molded to which the electromagnetic wave shielding process is applied. The conductive base material sheet is formed by laminating a coating material in a finger-touch dry state on the face of a vehicle impregnating base material which is bendable and deformable, wherein the coating material includes conductive metal particles dispersed in a vehicle. When the resin molded object is formed, the conductive base material sheet is heated and pressurized to make the coating material layer-closely into contact with the face of the resin molded object to be molded to which the electromagnetic wave shielding process is applied, then the vehicle of the coating material layer is impregnated into the vehicle impregnating base material to form the electromagnetic wave shielding layer, in which the conductive metal particles of the coating material layer are flat-rolled and deformed between the resin molded object and the conductive base material sheet. The conductive base material sheet is peeled off and removed from the resin molded object in such a state that the electromagnetic wave shielding layer remains on the face of the resin molded object to which the electromagnetic wave shielding process is applied. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method of manufacturing an electromagnetic wave shielding resin molded body that is employed in electrical products such as plasma displays that generate electromagnetic waves, and casings of electronic devices.

  As is well known, electrical products and electronic devices such as plasma displays that generate electromagnetic waves have measures to shield electromagnetic waves that adversely affect other electrical products and electronic devices in the resin casing. Therefore, there is a strong demand for an electromagnetic wave shielding resin molded body that can efficiently take measures against electromagnetic wave shielding on a resin casing and that has excellent shielding characteristics.

  As a countermeasure method for mounting an electromagnetic wave shielding material on the resin casing, an impregnated base material made of a thermoplastic nonwoven fabric into which a synthetic resin vehicle is immersed, and a conductive paint, conductive paste or conductive material applied thereon. An electromagnetic wave shielding material comprising a conductive agent containing conductive particles made of a conductive ink, and an impregnated base material coated with the conductive property imparting agent being heated and pressurized, and the electromagnetic wave shielding material A manufacturing method has been proposed (Patent Document 1).

  Further, as a countermeasure method for integrally molding the electromagnetic shielding material with the resin casing, an electromagnetic shielding resin molded body having a layered integrated structure of the outer layer resin molded body, the electromagnetic shielding material and the inner layer resin molded body, In addition, in the electromagnetic wave shielding resin molded product, the electromagnetic wave shielding material is an electromagnetic wave shielding sheet produced by heating and pressing an impregnating base material sheet coated with a conductivity imparting agent, the outer layer resin molded body, the electromagnetic wave shielding material, and the inner layer resin An electromagnetic shielding resin molded article having a layered integrated structure formed by inserting a layered integrated structure of a molded body into a mold and injection molding an inner resin molded body has been proposed (Patent Document 2). A flexible mesh-like electromagnetic shielding fiber is placed, the mold is clamped, and a resin is injected. Electromagnetic shielding fibers and resin molded article and a manufacturing method thereof to improve the adhesion between the injected resin is out resin enters has been proposed (Patent Document 3).

Japanese Patent No. 2606504 Registered Utility Model No. 3028096 Japanese Patent Laid-Open No. 11-292050

  However, in the electromagnetic wave shielding material disclosed in Patent Document 1, the electromagnetic wave shielding material must be molded so as to conform to the shape of the surface before being attached to the surface of the resin casing that is subjected to the electromagnetic wave shielding treatment. In addition, there is a problem that an adhesive or the like must be used when mounting, and in the electromagnetic wave shielding resin molded product disclosed in Patent Document 2, the outer layer resin molded body is injection molded. There is a problem that the inner layer resin molded body must be injection molded by molding and mounting an electromagnetic wave shielding material on the surface to be subjected to electromagnetic wave shielding treatment of the outer layer resin molded body later, so as to match the shape of the surface, Moreover, in the resin-molded product disclosed in Patent Document 3, unless the mesh-like electromagnetic shielding fiber having electromagnetic shielding properties is obtained by performing electroless plating of copper or nickel on the mesh-like fiber. Since there is no et al., Work efficiency is increasing the production process there has been a problem that bad.

  Then, this invention makes it a technical subject to solve the said various problems, and when forming resin moldings, such as a resin-made housing | casing, an electromagnetic wave shielding layer is provided in the surface which performs the electromagnetic wave shielding process of a resin molding simultaneously. The object has been achieved by providing a method for producing an electromagnetic wave shielding resin molded body that can be formed efficiently and at low cost.

  The technical problem can be solved by the present invention as follows.

  That is, in the method for producing an electromagnetic wave shielding resin molded body according to the present invention, a coating material containing conductive metal particles dispersed in a vehicle is laminated in a dry state on the surface of the vehicle-impregnated base material that can be bent and deformed. The conductive material sheet of the conductive base sheet formed is disposed at a position to be a surface to be subjected to electromagnetic wave shielding treatment of the resin molded body to be molded, and when the resin molded body is molded, the conductive group The material sheet is heated and pressed to closely adhere to the surface of the resin molded body to be subjected to the electromagnetic wave shielding treatment, and the vehicle impregnated base material is impregnated with the vehicle-impregnated base material. An electromagnetic shielding layer in which the conductive metal particles of the coating material layer are rolled and deformed is formed between the conductive base sheet and the electromagnetic shielding layer of the resin molded body. The conductive substrate sheet is peeled off from the resin molded body while remaining on It is obtained so as to remove.

  According to the present invention, there is used a conductive substrate sheet obtained by laminating a coating material containing conductive metal particles dispersed in a vehicle on a surface of a vehicle-impregnable substrate that can be bent and deformed, in a dry-to-touch state. The coating material layer is disposed at a position to be a surface to be subjected to electromagnetic wave shielding treatment of the resin molded body to be molded, and between the resin molded body molded by heating and pressing during the resin molding and the conductive base sheet. The conductive base material sheet is formed in a state where an electromagnetic wave shielding layer is formed by rolling and deforming the conductive metal particles of the coating material layer, and the electromagnetic wave shielding layer is left on the surface to be subjected to the electromagnetic wave shielding treatment of the resin molded body. Because it is peeled and removed from the resin molded body, when molding a resin casing of an electric product or electronic device, an electromagnetic wave shielding layer is efficiently and inexpensively provided on the surface of the resin molded body to be subjected to electromagnetic wave shielding treatment at the same time. Can be formed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.

  FIG. 1 is a longitudinal sectional view of a conductive substrate sheet, and FIG. 2 is a longitudinal sectional view for explaining a production process of an electromagnetic wave shielding resin molded body. In these drawings, 1 is a vehicle-impregnated substrate 2 that can be bent and deformed. And a coating material layer 3 laminated on the top surface of the vehicle-impregnated substrate 2 in a dry-to-touch state. The coating material layer 3 is composed of conductive metal particles in the vehicle 4. 5 is formed by a coating material containing 5 in a dispersed manner. In FIG. 2, reference numeral 6 denotes an electromagnetic wave shielding layer 9 that remains in close contact with the surface 8 (hereinafter also referred to as “treated surface”) of the resin molded body 7 on which electromagnetic wave shielding processing is performed, and the resin molded body 7. The electromagnetic wave shielding resin molded body is composed of a resin molded body 7 and a conductive group which are molded by the coating material layer 3 being in close contact with the treatment surface 8 by heating and pressurizing by a hot press method. It is formed by rolling and deforming the conductive metal particles 5 between the material sheets 1. In addition, 10 is a hot press stand, 11 is a heat press stand, and 12 is a molding resin that becomes a resin molded body 7 by molding.

  Next, the manufacturing method of the electromagnetic wave shielding resin molded body 6 will be described.

  First, as shown in FIG. 2A, the surface of the coating material layer 3 of the conductive base sheet 1 is positioned on one surface of the molding resin 12 (the surface that becomes the processing surface 8 of the resin molded body 7 by molding). And then heated at a heat deformation temperature of the coating material layer 3 or a temperature lower by 10 to 20 ° C. (180 to 300 ° C. in the case of a thermoplastic resin) than the conductive material layer 3 to the molding resin 12 from the conductive substrate sheet 1 side. The vehicle 4 of the coating material layer 3 is impregnated and adsorbed on the vehicle-impregnated base material 2 by applying pressure toward the vehicle, and the vehicle 4 is impregnated and adsorbed by adhering the coating material layer 3 to one surface of the molding resin 12. As shown in FIG. 2 (b), the conductive metal particles 5 of the coating material layer 3 are rolled between the resin molded body 7 formed by molding the molding resin 12 and the conductive substrate sheet 1. An electromagnetic wave shielding layer 9 which is deformed to form a layer is formed, and thereafter, the conductive substrate sheet 1 is peeled and removed from the molded resin molded body 7. To leave an electromagnetic shielding layer 9 on the treated surface 8 of the resin molded body 7.

  As the coating material, resin paints, resin inks, and resin pastes may be used. The vehicle 4 is a thermoplastic resin compatible with the resin molded body 7 or an adhesive thermosetting resin (acrylic, polyester). It is preferable to selectively use a coating material layer 3 if the coating material layer 3 is in a dry-to-touch (semi-cured) state, the vehicle 4 is easily dissolved into the resin molded body 7. It is more preferable because the vehicle-impregnable base material 2 is melt-impregnated at the same time as being melt-fixed. Further, if a mixture of conductive metal particles 5 and vehicle 4 in a ratio of 30 to 80 parts by weight: 70 to 20 parts by weight is used as the coating material, the vehicle-impregnated base material 2 is obtained by a method such as printing or coating. It is more preferable because it can be easily applied (laminated) to the surface and the electromagnetic wave shielding layer 9 can be formed to a thickness in the range of 30 to 200 μm.

The pressurizing condition may be a high pressure, but since the molding resin 12 is heated, it may be selected in the range of 5 to 300 kgf / cm ² depending on the molding process. From the viewpoint of productivity, the hot press method may be 50 to 300 kgf / cm ² , and the compressed air molding method may be 5 to 30 kgf / cm ² .

  In addition, the conductive metal particles 5 are made of Ag, Cu, Al, Ni, Fe, or an alloy thereof, a treated alloy such as Ag-coated Cu or Ag-coated Ni, or an alloy of other various treated composite particles. That's fine. The shape of the metal particles 5 is preferably a flake shape or an irregular shape. In the case of spherical particles, even if the metal particles are deformed and brought into close contact by heating and pressure bonding, the contact between the metal particles becomes a point contact, which is not preferable. In the case of flaky metal particles, since the particles are bent in a three-dimensional and three-dimensional manner into the inter-particle gap and contact in a network structure, the non-contact part between the particles decreases and the contact density increases. The conductive performance of the electromagnetic wave shielding layer 9 is improved, and stable performance and quality can be obtained. Also, mixed particles of flaky metal particles and irregular metal particles, mixed particles of flaky metal particles and spherical metal particles, or mixed particles of flaky metal particles, irregular metal particles and spherical metal particles In flaky metal particles, a phenomenon occurs in which irregularly shaped metal particles bite into gaps between irregularly shaped metal particles or spherical metal particles, and irregularly shaped metal particles into gaps between flaky metal particles. Similar effects can be obtained. Therefore, the conductive metal particles 5 include flaky metal particles, irregular metal particles, mixed particles of irregular metal particles and flaky metal particles, mixed particles of irregular metal particles and spherical metal particles. Or what is necessary is just to use the thing of 3 types mixed particle | grains of an irregular-shaped metal particle, a flaky metal particle, and a spherical metal particle. Thus, specifically, a conductive performance of 0.6Ω is obtained for Cu metal particles, and a conductive performance of 0.05Ω is obtained for Ag metal particles.

Specifically, irregular metal particles having a particle diameter of 1 to 90 μm, a BET specific surface area of 0.1 to ¹ m ² / g, and a packing density of 0.7 to 4.0 g / cm ³ are used as basic materials, and the metal particles have a particle shape of 5 to 50 μm. , Flaky metal particles with an aspect ratio (ratio of particle thickness to maximum particle size) of 1/50 to 1/5, BET specific surface area of 0.1 to ³ m ² / g, packing density of 0.7 to 3.0 g / cm ³ and particle size Conductive metal particles 5 mixed with spherical metal particles having 1 to ³⁰ μm, BET specific surface area of 0.1 to ⁵ m ² / g, and packing density of 0.7 to 5.0 g / cm ³ may be used.

  The conductive metal particles 5 are preferably subjected to oxidation / corrosion prevention treatment. Specifically, oxygen and moisture enter the metal particle interface due to the extremely small adhesion between the metal particles and the vehicle and the metal particles are oxidized to reduce the conductivity. It is preferable to use conductive metal particles 5 coated with a coupling agent such as an amine-based material of less than mass%, an organic material of less than 2 mass%, a titanate-based material, an aluminate-based material, a zirconate-based material, and a silane-based material. For Particle 5, a salt spray test that repeats a cycle of spraying 2-5% salt water for 24 hours three times, a high temperature / high humidity test of 60 ° C / 500 hours, and a low temperature of -40 ° C to a high temperature of 60 ° C 20 Even when the environmental test of the heat cycle test repeated for 30 cycles is performed, the conductive performance before and after the environmental test shows a stable value of 0.6Ω or less.

  The vehicle-impregnated substrate 2 can withstand the molding temperature and pressure during resin molding, can impregnate or adsorb the coating material, and does not allow the conductive metal particles 5 to pass through. A fibrous resin that can be bent and deformed, such as a mesh sheet, may be used, but it is preferable to use a material that is easily peeled off from the electromagnetic wave shielding layer 9 after the electromagnetic wave shielding layer 9 is formed. Specifically, a fiber-like, mesh-like or matte-like cloth or nonwoven fabric made of thermoplastic / thermosetting synthetic resin (polyester, nylon, polypropylene, aramid, etc.) or natural fiber such as hemp, silk, cotton, etc. Paper, a sheet-like inorganic material such as a glass mat or glass cloth, and other materials can be used as long as they can be bent and the vehicle can easily be impregnated and penetrated.

  FIG. 3 (electron micrograph of drawing substitute of magnification × 230 showing the metal particle structure of the coating material layer before heating / pressing) and FIG. 4 (electromagnetic wave after heating / pressing) by heating / pressing by the hot press method. A vehicle layer is formed between the coating material layer 3 and the vehicle-impregnated substrate 2 after heating and pressurization, as shown in a drawing-substituting electron micrograph at 180 × showing the metal particle structure of the shielding layer). Therefore, the vehicle-impregnated base material 2 can be easily peeled from the electromagnetic wave shielding layer 9. The vehicle 4 around the metal particles 5 is adsorbed to the vehicle-impregnated substrate 2 by heating and pressurization, and the metal particles 5 are pressure-bonded, whereby conductivity is obtained.

3 and 4, in the electron micrograph before heating and pressurization (FIG. 3), the conductive metal particles (Cu) 5 in the coating material layer 3 are covered with the vehicle 4, and Cu The adhesion / adhesion between the particles 5 is incomplete, but in the electron micrograph after heating / pressing (FIG. 4), the vehicle 4 heated at a heating temperature of 180 ° C. and a hot press pressure of 280 kgf / cm ² is shown. The vehicle impregnated base material 2 is melted and impregnated, and the Cu particles 5 are crushed and the Cu particles 5 are adhered and fixed to each other to form the electromagnetic wave shielding layer 9. In this example, the thickness of the electromagnetic wave shielding layer 9 formed by heating and pressing was 75 μm with respect to the thickness of 200 μm of the coating material layer 3 before heating and pressing.

  Further, the electromagnetic wave shielding layer 9 may be formed by heating / pressing by a vacuum forming method, a pressure forming method or the like instead of the hot pressing method.

Embodiment 2. FIG.

  This embodiment is an electromagnetic wave shielding resin molded body in which a rear surface casing (resin molded body) of a plasma display (hereinafter also referred to as “PDP”) is provided with an electromagnetic shielding measure. FIG. FIG. 6 is a partial longitudinal sectional view for explaining the molding of the rear casing of the plasma display, and FIG. 7 is a longitudinal sectional view of the rear casing of the plasma display. In these drawings, the same reference numerals as those in FIGS. 1 and 2 denote the same or corresponding parts, and reference numeral 13 denotes a PDP casing composed of a rear casing (resin molded body) 7 that has been subjected to electromagnetic wave shielding treatment. The housing 13 is formed by a front housing 14 and a rear housing 7, and includes an electric circuit board 15, a display panel 16 connected to the electric circuit board 15 by a flexible cable, and the electric circuit board 15 and the display panel 16. Between the metal chassis 17 and the front filter 18 covering the screen. An electromagnetic wave shielding layer 9 is formed on the surface 8 of the rear housing 7 on which electromagnetic wave shielding processing is performed. Therefore, in the present embodiment, the PDP rear case molded body composed of the rear case 7 and the electromagnetic wave shielding layer 9 is the electromagnetic wave shielding resin molded body 6.

  Next, the manufacturing method of the electromagnetic wave shielding resin molding will be described with reference to FIG.

First, the conductive base sheet 1 is set in the conductive base sheet supply device 19 and inserted between the mold cavity 20 and the mold core 21 so that the coating material layer 3 faces the mold cavity 20 side. Then, the coating material layer surface is positioned on the processing surface 8 of the molding resin (rear housing 7 to be molded) 12, and then the mold core 21, ejector pins 22 and ejector plate 23 are moved and clamped. Then, the screw 25 of the heating cylinder 24 is driven to inject and inject the molten resin 26 inside the heating cylinder 24 into the mold. As a result, the coating material layer 3 is in close contact with the molding resin 12 and the vehicle 4 melts and adheres to the inner surface of the molding resin 12 at a resin temperature of 180 to 350 ° C., and the vehicle 4 impregnates the vehicle-impregnated substrate 2. -Adsorbed, the conductive metal particles 5 in the coating material layer 3 are rolled and deformed by an injection molding pressure of 300 to 800 kgf / cm ² to cause the conductive metal particles 5 to adhere to each other, thereby forming an electromagnetic wave shielding layer 9. Is done. Thereafter, when the mold is opened and the conductive base sheet 1 is peeled off from the molded rear case 7, the electromagnetic wave shielding layer 9 firmly fixed to the inner surface of the rear case 7 by the vehicle 4 is transferred to the inner surface. In this state, a PDP rear case molded body (electromagnetic wave shielding resin molded body) 6 is obtained which is subjected to electromagnetic wave shielding measures.

  In the present embodiment, the electromagnetic wave shielding layer 9 is formed using the sheet-like vehicle-impregnated base material 2 that can be bent and deformed, so that there are no cracks or wrinkles at the corners of the bent portion of the PDP rear case molded body 6. An electromagnetic wave shielding resin molding can be formed.

Embodiment 3 FIG.

  FIG. 8 is a longitudinal sectional view for explaining a production process of an electromagnetic wave shielding resin molded body by a hot press method, in which the same reference numerals as those in FIGS. 1, 2 and 5 to 7 denote the same or corresponding parts, In the present embodiment, the hot press upper die 27 with the coating material layer 3 of the base sheet 1 facing the upper surface (treated surface) of the resin sheet 29 with the hot press upper die 27 and the hot press lower die 28 opened. -Insert between the lower dies 27 and 28, and then close the hot press upper die 27 and the hot press lower die 28 as shown in FIG. The resin sheet 29 and the base sheet 1 are heated and a pressure press is performed by hydraulic pressure. As a result, as shown in FIG. 8B, the resin sheet 29 is molded and the molten vehicle 4 adheres to the treated surface of the resin sheet 29, so that the resin sheet 29 and the vehicle 4 are fixed, The vehicle-impregnated base material 2 is impregnated and adsorbed with the vehicle 4, and the conductive metal particles 5 in the coating material layer 3 are added between the resin sheet 29 and the vehicle-impregnated base material 2 by the pressure of the hydraulic press. The electromagnetic wave shielding layer 9 is formed by pressing and rolling. As shown in FIG. 8C, after the press machine is cooled, the resin sheet 29 on which the electromagnetic wave shielding layer 9 is formed is taken out and the vehicle-impregnated substrate 2 of the substrate sheet 1 is peeled off. An electromagnetic wave shielding resin molded body 6 composed of the resin molded body 7 obtained by molding 29 and the electromagnetic wave shielding layer 9 is obtained.

Embodiment 4 FIG.

  FIG. 9 is a longitudinal sectional view for explaining the manufacturing process of the sheet-like electromagnetic wave shielding resin molding, in which the same reference numerals as those in FIGS. 1, 2, and 5 to 8 denote the same or corresponding parts. In this embodiment, the base material sheet 1 is set in the supply device 32 so that the coating material layer 3 of the base material sheet 1 comes into contact with the treated surface of the heated sheet-like resin 31 extruded from the extruder 30. By pressing the base sheet 1 against the sheet-shaped resin 31 through the pressure roller 33, the sheet-shaped resin 31 and the vehicle 4 are fixed, and the vehicle-impregnated base material 2 is impregnated and adsorbed with the vehicle 4. At the same time, the conductive metal particles 5 in the coating material layer 3 are pressed and rolled between the sheet-like resin 31 and the vehicle-impregnated base material 2 to form the electromagnetic wave shielding layer 9, and the sheet-like resin 31 is formed. Electromagnetic wave shielding comprising a resin molded body 7 and an electromagnetic wave shielding layer 9 molded by The covering resin molding 6 is obtained. Reference numeral 34 denotes a guide roller, and 35 denotes a winding device.

Example 1: 80 weights of irregularly shaped Cu particles 5 (trade name: FCC-115A: manufactured by Fukuda Metal Foil Powder Co., Ltd.) and vehicle 4 (trade name: PET ink 900-N: manufactured by Jujo Chemical Co., Ltd.) Part: A coating material was obtained by blending at a ratio of 20 parts by weight. The coating material is screen-printed twice on the surface of the vehicle-impregnated base material 2 (nylon taffeta woven fabric) to form a coating material layer 3 in a dry-to-touch state, and a conductive base material sheet 1 was obtained.

Based on Embodiment 2 shown in FIG. 6 using the conductive base sheet 1, resin used: ABS (trade name: 930N: manufactured by Toray Industries, Inc.), molding temperature: 250 ° C., mold temperature: 60 ° C. , Injection pressure: Primary pressure 650kgf / cm ² , Secondary pressure 400kgf / cm ² , Holding time: 15 seconds, Cooling time: 45 seconds Under the injection molding conditions, the rear housing 7 and electromagnetic waves molded with the molding resin 12 A PDP rear case molded body (electromagnetic wave shielding resin molded body) 6 composed of the shielding layer 9 was formed.

  The electromagnetic wave shielding layer 9 had a thickness of 120 μm, an electric resistance value of 0.6Ω, and an electric field of −62 dB. The electrical resistance value was measured using an AD-5523 measuring distance of 100 mm manufactured by A & D Co., Ltd., and the electric field was measured by KEC method using Anritsu MA8202, 0.1-1000Mz.

Example 2: Resin used: ABS (trade name: 930N: manufactured by Toray Industries, Inc.), cylinder temperature: 210-230 ° C, die temperature: 230 ° C, resin temperature: 240 ° C, based on Embodiment 4 shown in FIG. , Roll temperature: a sheet-like resin 31 having a sheet thickness of 2 mm between rolls is obtained under extrusion molding conditions of 80 ° C., and the sheet-like resin 31 is used and the example is based on the third embodiment shown in FIG. Using the conductive base sheet 1 obtained in 1 above, the PDP rear case molded body (sheet heating temperature: 180 ° C., heating press pressure: 280 kgf / cm ² , pressurization / cooling time: 60 seconds under hot press conditions ( An electromagnetic wave shielding resin molded body) 6 was formed.

Example 3: Using the conductive base sheet 1 obtained in Example 1 using the sheet-like resin 31 of Example 2, sheet heating temperature: 180 ° C., pressure pressure (air pressure): 10 to 15 kgf / cm ^2. Pressurization / cooling time: A PDP rear case molded body (electromagnetic wave shielding resin molded body) 6 was formed under pressure forming conditions of 60 seconds.

  Each of the PDP rear case molded bodies of Examples 2 and 3 had a shielding performance of the electromagnetic wave shielding layer 9 having a thickness of 120 μm, an electric resistance value of 0.6Ω, and an electric field of −62 dB.

  INDUSTRIAL APPLICABILITY According to the present invention, it can be used for an electromagnetic wave shielding resin molded body that requires electromagnetic wave shielding, such as a building material and an automobile part, as well as an electric product such as a plasma display that generates electromagnetic waves and a casing part of an electronic device. .

  Therefore, it can be said that the industrial applicability of the present invention is very high.

It is a longitudinal cross-sectional view of an electroconductive base material sheet. It is a longitudinal cross-sectional view explaining the manufacturing process of an electromagnetic wave shielding resin molding. It is a drawing substitute electron micrograph of the magnification x230 which shows the metal-particle structure of the coating material layer before a heating and pressurization. 2 is a drawing-substituting electron micrograph at a magnification of × 180 showing the metal particle structure of the electromagnetic wave shielding layer after heating and pressing. It is a longitudinal cross-sectional view of a plasma display housing. It is a partial longitudinal cross-sectional view explaining the shaping | molding of the rear surface housing | casing of a plasma display. It is a longitudinal cross-sectional view of the rear housing | casing of a plasma display. It is a longitudinal cross-sectional view explaining the manufacturing process of the electromagnetic wave shielding resin molding by a hot press method. It is a longitudinal cross-sectional view explaining the manufacturing process of a sheet-like electromagnetic wave shielding resin molding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conductive base material sheet 2 Vehicle impregnation base material 3 Coating material layer 4 Vehicle 5 Conductive metal particle 6 Electromagnetic wave shielding resin molding 7 Resin molding 8 Treated surface (surface which performs electromagnetic shielding treatment)
9 Electromagnetic wave shielding layer 12 Molding resin 13 PDP housing (electromagnetic wave shielding resin molding)
29 Resin sheet (resin molding)

Claims (1)

Forming the coating material layer of a conductive substrate sheet formed by laminating a coating material containing conductive metal particles dispersed in a vehicle on a vehicle-impregnated substrate surface that can be bent and deformed in a dry touch state. The resin molded body is disposed at a position to be a surface to be subjected to electromagnetic wave shielding treatment, and when molding the resin molded body, the conductive base material sheet is heated and pressurized to form a coating material layer. Conductive metal of the coating material layer is placed between the resin molded body and the conductive base material sheet by adhering the vehicle of the coating material layer to the vehicle-impregnated base material while closely contacting the surface of the molded body to which electromagnetic wave shielding treatment is performed. Form an electromagnetic wave shielding layer in which particles are rolled and deformed, and then peel and remove the conductive substrate sheet from the resin molded body in a state where the electromagnetic wave shielding layer is left on the surface to be subjected to the electromagnetic wave shielding treatment of the resin molded body. Manufacturing method of electromagnetic wave shielding resin molded article characterized by