JP4736825B2 - Method for manufacturing electromagnetic shielding mesh - Google Patents

Description

The present invention relates to an electromagnetic wave shielding mesh that shields electromagnetic waves generated from a display such as a PDP, and in particular, even if each film is subjected to an electromagnetic wave shielding mesh film while being conveyed by a conveying roll in each manufacturing apparatus, the plastic wound manufacturing method of wave shielding mesh collector that does not generate the (transfer traces) relating to the sheet surface.

A PDP (plasma display panel) using light emission by gas discharge has an electromagnetic wave shield on the front surface (observer side) of the panel in order to shield electromagnetic waves accompanying gas discharge.
As an electromagnetic wave shield to be applied to a PDP, for example, an electromagnetic wave shield mesh in which a copper foil of a single-sided copper-clad plastic sheet is formed in a mesh shape is in practical use. This electromagnetic wave shielding mesh has a relatively small loss in luminance of the display and has an excellent shielding property.

FIG. 1 is a cross-sectional view illustrating an exemplary configuration of an electromagnetic wave shielding mesh. As shown in FIG. 1, the electromagnetic wave shielding mesh (10) is made of a copper foil through an adhesive (2) on one side of a transparent PET (polyterephthalate ethylene) sheet, for example, as a transparent plastic sheet (1). (3) is pasted.
A highly conductive copper foil is used as a material that absorbs electromagnetic waves. The copper foil (3) is formed into a predetermined shape, for example, a mesh shape, by etching.

FIG. 2 is a plan view from above of the shield mesh (10) shown in FIG. 1, and shows a partially enlarged view. FIG. 3 is a cross-sectional view taken along line XX ′ in FIG.
As shown in FIG. 2 and FIG. 3, the copper foil (3) formed into a mesh shape by etching is composed of a mesh portion (3A) and an opening portion (3B), and an adhesive ( 2) is exposed. Further, the surface of the mesh portion (3A) is blackened to prevent reflection.
Electromagnetic waves are shielded by the mesh part (3A) with the opening (3B). The width (W1) of the mesh part (3A) is about 10 μm, and the width (W2) of the opening (3B) is about 200 μm.

  When this electromagnetic shielding mesh (10) is used, a transparent plastic sheet (1) on which a copper foil (3) is bonded is attached to the front surface (observer side) of the panel via an adhesive (2). . In general, an antireflection film, a protective glass, a Ne light absorption filter, and the like are attached at the same time. The transparent plastic sheet (PET sheet) (1) has a thickness of 100 to 125 μm, the adhesive (2) has a thickness of 15 μm, and the copper foil (3) has a thickness of about 10 μm.

  FIG. 4 is a cross-sectional view showing an example of the configuration of an electromagnetic wave shielding mesh film (30) used for manufacturing the electromagnetic wave shielding mesh (10). As shown in FIG. 4, the electromagnetic wave shielding mesh film (30) is a transparent plastic sheet (1), for example, on one side of a transparent PET (polyterephthalate ethylene) sheet with an adhesive (2) interposed therebetween. A uniform layered copper foil (13) is bonded.

  When manufacturing the electromagnetic wave shielding mesh (10), a long belt-like film for electromagnetic wave shielding mesh (30) is used. First, for example, a) a photoresist coating film is formed on a copper foil (13) of an electromagnetic shielding mesh (30) raw fabric using, for example, a) casein, and then, b) exposure through a photomask. C) Formation of resist pattern by development, d) Etching of copper foil using ferric chloride, e) Stripping of resist pattern using sodium hydroxide, f) Blackening treatment of copper foil pattern, The copper foil (3) formed in the mesh shape comprised by a mesh part (3A) and an opening part (3B) is obtained by performing the process of these. The long strip-shaped electromagnetic shielding mesh raw material is finally cut into a sheet-shaped electromagnetic shielding mesh (10) having a predetermined size.

The width of the strip-shaped electromagnetic shielding mesh original fabric corresponds to the screen size of the panel, and is, for example, about 650 mm for a 42 inch screen and about 720 mm for a 50 inch screen. In each process starting from the formation of the photoresist coating film using a) casein, the electromagnetic shielding mesh film (30) is in the form of a long band and is held and transported on the transport roll in each apparatus. Each process is performed.
However, if each process is performed while being conveyed in each apparatus, the surface of the plastic sheet (1) of the electromagnetic wave shielding mesh film (30) may be damaged.

  FIG. 5 is a cross-sectional view showing a state in which the electromagnetic shielding mesh film (30) is conveyed on the conveying roll (29) in each apparatus. As shown in FIG. 5, if a minute scratch (21A) is generated on the surface of the transport roll (29) or if a minute foreign matter (22A) is attached, a minute scratch (21A) on the surface of the transport roll (29). ) And the irregular shape of the foreign matter (22A) are transferred to the surface of the plastic sheet (1), and the transfer trace (21B) of the scratch (21A) and the transfer trace (22B) of the foreign matter (22A) are transferred to the surface of the plastic sheet (1). May remain as a scratch (20) on the plastic sheet (scratch (20) on the plastic sheet = transfer trace (21B) + transfer trace (22B)).

When the scratch (20) on the surface of the plastic sheet is generated before exposure through the photomask (b), the scratch (on the vacuum adsorption of the electromagnetic wave shielding mesh film (30) at the time of exposure) 20) The air in the portion remains without being sucked, and the electromagnetic shielding mesh film (30) is in a poorly adhered state.
As a result, the mesh pattern is blurred and fluctuates in line width, and is viewed as unevenness on the display screen.

The electromagnetic wave shielding mesh (10) is formed with an adhesive layer on the surface (lower surface) of the plastic sheet (1) of the electromagnetic wave shielding mesh (10) shown in FIG. A protective layer is bonded to the upper or meshed copper foil (3).
FIG. 6 is a cross-sectional view showing a state in which an adhesive layer (4) is formed on the surface of the plastic sheet (1) in which scratches (transfer marks) are generated.

  As shown in FIG. 6, the adhesive layer (4) enters the transfer mark (22B) of the foreign matter (22A) and becomes convex, or becomes concave due to the transfer mark (21B) of the scratch (21A). Due to the difference in refractive index between the plastic sheet (1) and the adhesive layer (4), this convex shape or concave shape has the function of a lens, so that the irradiation light (L1) is scattered when attached to the panel. It becomes light (L2) and is viewed as unevenness on the display screen.

Such a scratch (transfer trace) (20) on the surface of the plastic sheet (1) is not limited to the occurrence before exposure through the b) photomask, but occurs in each step. D) ferric chloride solution in the copper foil etching step, and f) blackening treatment solution in the blackening step (e.g., chloric acid used to blacken a copper pattern on a printed wiring board) The temperature of the sodium, sodium hydroxide, sodium phosphate aqueous solution, etc.) is, for example, about 90 ° C., so that the plastic sheet (1) is in a softened state. A similar scratch (transfer trace) (20) on the surface of the plastic sheet (1) due to is likely to occur.
Japanese Patent No. 3388682 Japanese Patent Laid-Open No. 11-186785

The present invention has been made in order to solve the above-described problem, and in an electromagnetic shielding mesh manufacturing method in which a metal foil bonded to a transparent plastic sheet via an adhesive is formed in a mesh shape, Even if the film for electromagnetic wave shielding mesh is subjected to various treatments while being conveyed by a conveying roll, scratches (transfer traces) are not generated on the surface of the plastic sheet , and the electromagnetic wave shielding mesh is performed by performing a series of treatment steps once. each wave shielding mesh front and back surfaces of the use film, i.e., will be obtained the two electromagnetic wave shielding mesh, the method of manufacturing an electromagnetic wave shielding mesh with electromagnetic wave shielding mesh film for the production per working time approximately doubling The issue is to provide.

The present invention is a method of manufacturing an electromagnetic wave shielding mesh, as a film for electromagnetic wave shielding mesh, the structure of the material metal foil is bonded through an adhesive onto a transparent plastic sheet, on both surfaces of the substrate film on both sides of the release film provided with an adhesive layer, and the adhesive layer faces of the release film and the transparent plastic sheet surface, and the metal foil surface is adhered to so that a double-sided, film for electromagnetic wave shielding mesh After forming the predetermined pattern by simultaneously applying the respective processes for forming the pattern to the metal foils on both sides of the electromagnetic shielding mesh film, the material on which the pattern is formed is peeled off from the adhesive layer on both sides of the peeling film. An electromagnetic wave shielding mesh, wherein the electromagnetic wave shielding mesh is produced .

Further, the present invention provides a method for producing an electromagnetic wave shielding mesh according to the invention, the adhesive layer is an electromagnetic wave shielding mesh manufacturing method which is a pressure-sensitive adhesive layer loses its tackiness by UV irradiation.

  The present invention provides a material having a structure in which a metal foil is bonded to a transparent plastic sheet via an adhesive, and a plastic sheet surface of the material on both sides of a release film provided with an adhesive layer on both sides of a base film. Is a film for an electromagnetic shielding mesh bonded to the adhesive layer of the release film, so that the electromagnetic shielding mesh film is manufactured by applying each treatment to the electromagnetic shielding mesh film while being conveyed by a conveying roll in each device. Even if it becomes a film for electromagnetic wave shield meshes which a crack (transfer trace) does not generate | occur | produce on the surface of a plastic sheet.

Thereby, the adhesion failure at the time of exposure due to the scratch (20) on the surface of the plastic sheet is eliminated, and the blur of the mesh pattern and the fluctuation of the line width are eliminated. Further, the scattered light of the lens action of the adhesive layer due to the scratch (20) on the surface of the plastic sheet is eliminated. Therefore, the display screen is free from variations in line width and unevenness due to scattered light, and a good display screen can be obtained.

In the present invention, since the pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer that loses its pressure-sensitive adhesive property by UV irradiation, the plastic sheet can be easily peeled after a predetermined pattern is formed on the metal foil.
In addition, the present invention uses the above-described electromagnetic shielding mesh film in which a material having a configuration in which a metal foil is bonded to a transparent plastic sheet via an adhesive is bonded to both sides of a release film, and the metal foil on both sides Each process is simultaneously performed to form a predetermined pattern, and then the plastic sheet is peeled to produce an electromagnetic wave shielding mesh. Therefore, by performing a series of processing steps once, electromagnetic shielding meshes, that is, two electromagnetic shielding meshes can be obtained from the front and back of the electromagnetic shielding mesh film, and the production amount per working time is substantially doubled. To do.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 7 is a cross-sectional view showing the configuration of the electromagnetic shielding mesh film according to the present invention. As shown in FIG. 7, the film (60) for electromagnetic wave shielding mesh according to the present invention comprises a material (a metal foil (13) bonded to a transparent plastic sheet (1) via an adhesive (2)). 50) on the both sides of the release film (40) provided with the adhesive layer (42) on both sides of the base film (41), the surface of the plastic sheet (1) of the material (50) having the above structure is placed on the release film (40). 40) and adhered to the adhesive layer (42).

  Examples of the transparent plastic sheet (1) include a transparent PET (polyethylene terephthalate) sheet, and examples of the metal foil (13) include a copper foil. The transparent plastic sheet (PET sheet) (1) has a thickness of 100 to 125 μm, the adhesive (2) has a thickness of 15 μm, and the copper foil (13) has a thickness of about 10 μm. That is, in the present invention, the material (50) in which the metal foil is bonded to the transparent plastic sheet via the adhesive is the same as the example of the electromagnetic shielding mesh film (30) shown in FIG. It is.

As described above, the film (60) for electromagnetic wave shielding mesh according to the present invention has the transparent plastic sheet (1) surface of the material (50) having the above-described structure bonded to the adhesive layer (42) of the release film (40). And is not exposed on the outer surface of the electromagnetic shielding mesh film (60).
The metal foil (13) on both sides of the electromagnetic wave shielding mesh film (60) is subjected to each treatment simultaneously to form a predetermined pattern, and then the material having the above structure is formed from the adhesive layers (42) on both sides of the release film (40). (50) is peeled off to produce an electromagnetic shielding mesh. Therefore, the surface of the plastic sheet (1) does not generate a minute scratch on the surface of the transport roll or a scratch (transfer trace) due to a minute foreign matter.

Moreover, the adhesive layers (42) on both sides of the release film (40) in the present invention make it easy to peel off the material (50) having the above-mentioned configuration after a predetermined pattern is formed on the metal foil (13). Therefore, the pressure-sensitive adhesive layer (42) is preferably a pressure-sensitive adhesive layer that loses its adhesiveness when irradiated with UV.
However, the adhesive layer (42) is not limited to this, and the adhesive layer (42) does not peel off during the treatment, and can withstand each treatment, and has an adhesive property to such an extent that the material (50) of the composition is not affected during the peeling. However, any material that does not affect each material may be selected as appropriate. For example, an acrylic adhesive can be used.

The adhesive layer (42) that does not affect deformation or the like on the material (50) of the constituent during peeling includes JIS standard for peeling (JIS Z0237; pulling speed 300 mm / min, peeling angle 108 °, sample The size is preferably about 0.05 to 0.2 N / 25 mm.

FIG. 8 is an explanatory view of a process for producing an electromagnetic wave shielding mesh using the electromagnetic wave shielding mesh film (60) according to the present invention.
FIG. 8 (a) shows, for example, a) Forming a photoresist coating film (70) on a copper foil (13) on both sides of a long belt-like electromagnetic shielding mesh film (60) using, for example, a) casein. At the stage.
This double-sided coating film (70) is subjected to double-sided exposure through a photomask at the same time, followed by c) double-sided development at the same time to form a resist pattern on both sides of the electromagnetic shielding mesh film (60). Form (not shown).

Subsequently, using the formed double-sided resist pattern (70 ') as a mask, d) etching the double-sided copper foil (13) using ferric chloride to form the double-sided copper foil (13) in a mesh shape To do.
FIG. 8D shows the stage where the copper foil (13) has been etched, and shows the mesh portion (3A) of the copper foil.

Subsequently, as shown in FIG. 8 (e), e) stripping the resist pattern (70 ′) on both sides using an aqueous sodium hydroxide solution, and f) blackening treatment using a blackening solution. It gives to the mesh part (3A) of both surfaces (not shown), and the copper foil (3) formed in the mesh shape comprised by a mesh part (3A) and an opening part (3B) is obtained.
Subsequently, the plastic sheet (1) is peeled from the adhesive layers (42) on both sides of the release film (40) shown in FIG. 8 (e) to obtain an electromagnetic wave shield mesh (10) (FIG. 8 (g)).

  The electromagnetic wave shielding mesh (10) has an adhesive layer formed on the surface (lower surface) of the plastic sheet (1) of the electromagnetic wave shielding mesh (10) to be attached to the front surface of the panel. A protective layer is bonded onto the copper foil (3) formed in a shape (not shown).

  As described above, the method for producing an electromagnetic wave shielding mesh according to the present invention is a method for producing an electromagnetic wave shielding mesh without contacting the plastic sheet (1) of the material (50) having the above-described configuration and the transport roll. On the surface of the sheet (1), the scratches (transfer traces) caused by the fine scratches on the surface of the transport roll and the fine foreign matters do not occur.

  Further, as described above, between FIGS. 8A to 8D, that is, after a) the photoresist coating film (70) is formed to e) before the resist pattern (70 ′) is stripped. Since the resist is provided on the metal foil (13) or the mesh part (3A), the metal foil (13) or the mesh part (3A) is caused to have a minute scratch or minute on the surface of the transport roll by the transport roll. Scratches (transfer traces) caused by foreign matter do not occur.

  Scratches (transfer traces) are generated in the metal foil (13) or the mesh part (3A) before a) forming the photoresist coating film (70) and after e) stripping the resist pattern (70 ′). Although there is a thing, it can be said that it is few compared with the damage | wound (transfer trace) of the surface of the plastic sheet (1) in the said conventional method.

It is sectional drawing which shows the structure of an example of an electromagnetic wave shield mesh. It is a top view from the upper part of the shield mesh shown in FIG. 1, and has expanded and showed a part. FIG. 3 is a cross-sectional view taken along line X-X ′ in FIG. 2. It is sectional drawing which shows the structure of an example of the film for electromagnetic wave shield mesh used for manufacture of an electromagnetic wave shield mesh. It is sectional drawing which shows the state in which the film for electromagnetic wave shield meshes is conveyed on a conveyance roll within each apparatus. It is sectional drawing which shows the state by which the adhesion layer was formed in the plastic sheet surface which the damage | wound (transfer trace) generate | occur | produced. It is sectional drawing which shows the structure of the film for electromagnetic wave shield mesh by this invention. It is explanatory drawing of the process of manufacturing an electromagnetic wave shield mesh using the film for electromagnetic wave shield mesh by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Plastic sheet 2 ... Adhesive 3 ... Copper foil 3A formed in mesh shape ... Mesh part 3B ... Opening part 4 ... Adhesive layer 10 ... Electromagnetic wave shielding mesh 13 ... Metal foil (copper foil)
20 ... Scratches 21A on the surface of the plastic sheet 21 ... Slight scratches on the surface of the transport roll 21B ... Transfer marks 22A of the wound transferred to the surface of the plastic sheet 22 ... Slight foreign matter 22B on the surface of the transport roll ... Plastic Transfer trace 29 of foreign matter transferred to the surface of the sheet ... Conveying roll 30 ... Film for electromagnetic shielding mesh 40 ... Release film 41 ... Base film 42 ... Adhesive layer 50 ... On plastic sheet Material 60 having a structure in which a metal foil is bonded via an adhesive agent ... Electromagnetic wave shielding mesh film 70 ... Photoresist coating film 70 '... Resist pattern L1 ... Irradiation light L2 ... Scattering Light W1... Mesh part width W2... Opening part width

Claims (2)

A manufacturing method of the electromagnetic wave shielding mesh, as a film for electromagnetic wave shielding mesh, the material of the metal foil is bonded through an adhesive onto a transparent plastic sheet configuration, an adhesive layer provided on both surfaces of the substrate film on both sides of the release film, and the adhesive layer faces of the release film and the transparent plastic sheet surface, and the metal foil surface is adhered to so that a double-sided, using the film for electromagnetic wave shielding mesh, pattern The metal foils on both sides of the electromagnetic shielding mesh film are simultaneously subjected to the respective processes to form a predetermined pattern, and then the material on which the pattern is formed is peeled off from the adhesive layer on both sides of the peeling film, thereby The manufacturing method of the electromagnetic wave shield mesh characterized by using a mesh . The method for producing an electromagnetic wave shielding mesh according to claim 1, wherein the adhesive layer is an adhesive layer that loses its adhesiveness by UV irradiation.

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