JP2003138669A - Electromagnetic shield method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide not only for a new construction but also for remodeling of an existing building, this method can easily provide good electromagnetic shield effect over the whole frequency range without worsening the appearance and design ability in this electromagnetic shield method. SOLUTION: Electromagnetic shield sheet 33 having an electrically conductive layer is used as an interior finish material for wall surface and ceiling, and an electromagnetic shield joint tape 32 having an electrically conductive layer at an joint portion 34 between the electromagnetic shields 33 is provided in this electromagnetic shield method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shield construction method, and more particularly to an electromagnetic shield construction method useful for providing an electromagnetic shield in a room space such as a newly built or existing office building.

[0002] With the progress of information processing and communication technology using radio waves, it is necessary to electromagnetically shield a room or a certain space from the outside in a newly built or existing office building. In that case, the space must be electromagnetically shielded.

For the electromagnetic shield, it is necessary to cover the entire boundary surface with the outside of the space with a conductive material. For that purpose, if it is a new construction, it is conceivable that all the constituent materials of the building are composed of a conductive material such as metal, but this is not realistic because a special material and a construction method are required. It is naturally impossible to apply such a method if the existing building is renovated.

As an electromagnetic shield construction method which can be applied to an existing building without changing the material and construction method of the building body, the inner surface of the body (for example, a concrete placing surface in the case of reinforced concrete construction) is electrically conductive. There is a method in which an electromagnetic shield material made of a conductive material such as a conductive non-woven fabric, a copper foil, and a zinc-plated iron plate is stuck without a gap, and then the interior work is carried out in the same manner as usual.

However, in this method, if it is a new construction, if it is a renovation of an existing building, all the existing interior materials (wallpaper, wall base material, lightweight steel frame, etc.) are once removed, and after the electromagnetic shield material is constructed, it is again used. Since it is necessary to carry out interior work, a large amount of waste material is generated, which is extremely unfavorable from the viewpoint of environmental protection, it is costly because new interior material needs to be prepared, the construction period is long, and the space to be constructed is However, there is a problem that it cannot be used for a long period of time.

Even in the case of new construction, if it is necessary to change the electromagnetic shielding performance (target frequency band, attenuation factor, etc.) in the future, it is naturally necessary to carry out the large-scale repair work as described above. Therefore, there is a problem that it is difficult to design the electromagnetic shield performance in consideration of future technological trends.

As a simpler method for repairing an existing building, the above-mentioned electromagnetic shield material is stuck on the existing interior wall surface without a gap, and further the interior work is usually performed on the inner surface of the body on the outer surface. There is also a method of applying (for example, adhering plaster board and wallpaper).

This method has an advantage that the step of removing the existing interior material can be omitted, but since the new wall surface is overlaid on the existing wall surface, the thickness of the base material (plaster board or the like) is almost equal to that of the existing wall surface (15 mm). Inevitably, there are problems that stick out. For this reason, the interior space is narrowed by that amount, and there is an unfavorable indoor design problem such as the surface of the window frame is dented from the wall surface. Often requires modification. There is also a problem of the adhesive strength between the electromagnetic shield material and the plaster board.

Further, although the electromagnetic shield performance can be enhanced, it cannot cope with the relaxation (elimination of a part of the frequency band or reduction of the attenuation rate) or removal of the electromagnetic shield performance, Large-scale repair work is required to replace or remove the electromagnetic shield material that has already been installed.

Further, in any of the above-mentioned construction methods, in the construction method using the conventional electromagnetic shield material, in order to secure the shielding performance, about 5 parts of the abutting portions of the electromagnetic shield materials are joined together.
There is also a problem that it is necessary to vertically stack the 0 mm edge, and the overlapping portion is swollen in a belt shape, and the appearance is impaired. In order to avoid this, complicated work such as welding, soldering, or embedding of conductive putty is required without overlapping the abutting portions, resulting in extremely poor workability.

Therefore, as an electromagnetic shield construction method which can be more easily installed, a wall base surface before interior finishing of the interior of a building constructed by a normal construction method, or a wall surface of an existing building from the interior wall surface by a usual method. In the case of ordinary wallpaper, an electromagnetic shield sheet such as an electromagnetic shield wallpaper that has a conductive layer instead of the normal wallpaper on the wall base surface from which the interior finish material of An electromagnetic shield construction method has been already proposed in which the electromagnetic shield construction method is applied in the same manner as the above (for electromagnetic wave shield wallpaper, JP-A-10-217397 and JP-A-2000-
54523, JP 2001-60789 A,
Utility Model Registration No. 25677798).

[0012] According to this method, a new construction or renovation of a building can be performed by a construction method which is completely the same as usual, only by changing the interior finishing material from an ordinary wallpaper to an electromagnetic shield sheet. For scrap materials, only wallpaper that has been removed (peeled) is enough. Further, even if it is necessary to change the electromagnetic shield performance after new construction or renovation, there is an advantage that it is possible to simply cope with the situation by replacing the normal wallpaper.

However, the above-mentioned construction method using an electromagnetic shield sheet such as an electromagnetic shield wallpaper as an interior finishing material also has the following problems. That is, interior finishing materials such as wallpaper are generally marketed in the form of a long winding body having a predetermined width (about 920 mm in Japan and about 530 mm overseas). It is constructed by a method in which a large number of pieces cut up to the length are lined up in the width direction and attached to the wall base surface.

At this time, in order to make the joints between the wallpaper adjacent to each other in the width direction inconspicuous, the construction is performed by abutting the widthwise end portions of the wallpaper, or the widthwise end portions of the wallpaper are arranged with a predetermined width. After stacking them on top of each other and pasting them once, cut both wallpaper at the same position in the length direction at the overlapped part, remove the cut strip-shaped ends, and then butt the cut ends of the remaining wallpaper Method to re-attach (common name,
Overlap method) is taken. It should be noted that such a joint portion between the wallpapers may be formed between the wallpapers arranged in the longitudinal direction as well as in the width direction due to the convenience of material supply and design requirements. .

Although this construction method is satisfactory in terms of design, when an electromagnetic shield sheet is used as the interior finishing material, electromagnetic waves leak from the elongated gaps at the abutting portions, so the electromagnetic shield The electromagnetic shielding performance inherent in the seat is hardly exhibited. In particular, electromagnetic waves that resonate with the length of this elongated gap are not attenuated at all. Since there are various gap lengths on the entire surface of the wall, the entire space surrounded by the wall may resonate with electromagnetic waves of any wavelength, resulting in a good electromagnetic shield effect over the entire frequency band. It is virtually impossible to get.

Further, since the electromagnetic shield needs to cover the entire space with a conductive material, it is naturally necessary to perform electromagnetic shield treatment on the ceiling surface, floor surface, windows, doors as well as the wall surface. Use of electromagnetic shield material or sheet on the ceiling and floor, use electromagnetic shield glass with transparent conductive film such as indium tin oxide deposited on windows, or attach transparent conductive film deposition film on ordinary glass As for the door, it is possible to deal with it by using a metal door or a metal foil stuck door.

However, for example, the ceiling surface and the wall surface (surrounding edge),
If there are gaps between the members or between the members and the wallpaper at the parts where different members are in contact, such as wall surface and floor surface (skirting board), wall surface and window (window frame), wall surface and door (door frame), The same principle as in the case of the wall surface causes electromagnetic wave leakage, and as a result, it is extremely difficult to obtain a good electromagnetic wave shielding effect over the entire required frequency band.

In order to prevent the leakage of electromagnetic waves from these gaps, a method of partially overlapping and attaching the electromagnetic shield sheets to each other at the joint between all the electromagnetic shield sheets, or between the electromagnetic shield sheets and the electromagnetic shield sheets There is also a method of eliminating the gap in the gap between the shield sheet and the member, between the members, or the like by welding or soldering the conductive materials, embedding the conductive putty, or the like. But,
These methods have problems such as deterioration of appearance design after construction, poor workability due to construction work, and insufficient electromagnetic shielding effect due to gaps remaining due to construction failure. There is.

[0019]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems in the prior art, and its purpose is to repair an existing building as well as a new building. It is also an object of the present invention to provide an electromagnetic shield construction method that can be easily applied to any of the above and can easily obtain a good electromagnetic shield effect over all frequency bands without deteriorating the appearance design property by a simple construction method.

[0020]

The electromagnetic shield construction method of the present invention is an electromagnetic shield construction method of forming an electromagnetic shield space by a conductive material in a room, wherein an electromagnetic shield sheet having a conductive layer is used for interior wall and ceiling. In addition to being used as a material, an electromagnetic shield joint tape having a conductive layer is provided at the joint between the electromagnetic shield sheets.

Further, the electromagnetic shield construction method of the present invention is an electromagnetic shield construction method for forming an electromagnetic shield space by a conductive material in a room. The ceiling and wall (surrounding edge), wall and floor (skirting board), wall and window ( It is characterized in that an electromagnetic shield joint tape having a conductive layer is provided at a position where different members such as a window frame), a wall and a door (door frame) are in contact with each other.

The electromagnetic shield construction method of the present invention is characterized in that the electromagnetic shield joint tape has a thickness of 20 to 300 μm and a width of 30 to 100 mm.

Further, in the electromagnetic shield construction method of the present invention, the electromagnetic shield joint tape comprises (A) a paper layer, (B) an adhesive layer, (C) a conductive layer, and (D) an adhesive layer. It is a feature.

The electromagnetic shield construction method of the present invention is as described above.
(A) Paper layer has a basis weight of 20 to 40 g / m ²Is a thin paper
It is characterized by that.

The electromagnetic shield method of the present invention is characterized in that the conductive layer (C) is a polyethylene terephthalate resin film having a thickness of 12 to 50 μm and provided with an aluminum vapor deposition layer.

Further, the electromagnetic shield method of the present invention is characterized in that the (D) adhesive layer is an adhesive layer.

Further, in the electromagnetic shield method of the present invention, the (D) adhesive layer is a rewetting paste layer, and the (D) adhesive layer interposes the (E) paper layer and the (F) adhesive layer. The above (C)
It is characterized by being laminated on a conductive layer.

The electromagnetic shield method of the present invention is characterized in that the (A) paper layer is provided with a design by printing.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an example of the structure of an electromagnetic shield sheet for use in the electromagnetic shield construction method of the present invention. In this electromagnetic shield sheet 11, a conductive layer 14 is laminated on a base material 12 with an adhesive layer 13 interposed therebetween, a decorative layer 15 is laminated thereon, and a print 16 for imparting a design property to the surface thereof is further provided. It has been subjected.

As the base material 12, any flexible sheet body such as paper or plastic film which is generally used as a base material such as wallpaper or decorative sheet can be used. Considering workability, backing paper for wallpaper is suitable.

The conductive layer 14 is aluminum,
Copper, metal foil such as iron, conductive woven fabric or conductive non-woven fabric made of conductive fibers such as metal fibers or metal-plated fibers, conductive paper mixed with conductive fibers, wire mesh made of metal fibers, A plastic film provided with a conductive thin film of metal or the like by vacuum deposition, sputtering or ion plating on the surface, a plastic film coated with a conductive coating agent, printed in a mesh shape, a dot shape or a solid shape with a conductive ink A plastic film or the like can be used. Among them, the aluminum vapor-deposited polyethylene terephthalate resin (PET) film is the most preferable in terms of productivity, processability, electromagnetic shielding performance and the like.

As a method for laminating the base material 12 and the conductive layer 14, any known method such as a dry laminating method or a polyethylene extruder laminating method (sand laminating method) can be used. At that time, the type of the adhesive layer 13 formed between the two may be appropriately selected according to the materials of the base material 12 and the conductive layer 14 and the laminating method.

As the decorative layer 15, a general wallpaper or a surface material thereof, a decorative sheet used for building materials or a surface material thereof may be used as it is. For example, in the case of wallpaper surface materials, various synthetic resins such as vinyl chloride resin, acrylic resin, olefin resin, styrene resin, mixtures of these synthetic resins and fillers, foaming agents, synthetic resin films, etc. As the wallpaper, the above-mentioned materials, paper such as Japanese paper and non-woven fabric, cloth laminated with backing paper, and as decorative sheet used for building materials, thin coated paper, vinyl chloride resin decorative sheet, olefin resin decorative sheet Etc. can be used arbitrarily.

Further, printing of a pattern or the like on the surface of the decorative layer 1
A design expression can be given by appropriately applying 6, embossing, or the like. If the decorative layer 15 is transparent, the printing 15 may be applied to the back surface of the decorative layer 15. Further, a protective layer made of a transparent synthetic resin may be provided on the decorative layer 15 or the print 16.

As a method for providing the decorative layer 15 on the conductive layer 14, various known coating methods can be used as long as the decorative layer 15 is a material that can be dissolved or dispersed in water or an organic solvent to be coated. For the decorative layer 15, for example, a dry laminating method or a sand laminating method, a decorative layer 1
A known method such as an extruder laminating method in which the thermoplastic resin for forming 5 is melted, extruded and laminated at the same time may be used.

FIG. 2 is a sectional view showing an example of the construction of an electromagnetic shield joint tape for use in the electromagnetic shield construction method of the present invention. In this electromagnetic shield joint tape 21, a conductive layer 24 is laminated on a base material 22 via an adhesive layer 23, and an adhesive layer 25 is laminated thereon.

If the electromagnetic shield joint tape 21 is too thick, the surface of the electromagnetic shield sheet to be applied thereon will be uneven as will be described later, which is not desirable in terms of design.
Therefore, it is desired that each of the constituent layers is as thin as possible. Specifically, the total thickness of the electromagnetic shield joint tape 21 is 20 to 300 μm, more preferably 50 to 100 μm.
It is good to say The width of the electromagnetic shielding joint tape 21 is 30 to 100 mm, more preferably 40 to 60 mm.
It is good to say

The base material 22 of the electromagnetic shield joint tape 21 is a thin paper or craft in consideration of the sticking property when the electromagnetic shield sheet is stuck on the surface (the surface opposite to the adhesive layer 25). Fibrous materials such as papers such as paper and non-woven fabrics are desirable (the present invention collectively includes these as a paper layer), and when the thickness constraint described above is also taken into consideration, the basis weight is about 20 to 40 g / m ² . It is most desirable to use thin paper.

As the conductive layer 24, similar to the conductive layer 14 in the electromagnetic shield sheet 11, a metal foil, a conductive woven cloth or a non-woven cloth, a metal net, a plastic film with a metal thin film, a plastic film with a conductive coating, a conductive ink. A printed plastic film or the like can be used, and an aluminum vapor-deposited polyethylene terephthalate resin (PET) film is most preferable. The thickness of the polyethylene terephthalate resin film is 12
It is preferable to select a material having a thickness of about 50 μm.

Regarding the method of laminating the base material 22 and the conductive layer 24 and the type of the adhesive layer 23 provided between the two,
This is the same as the case of laminating the base material 12 and the conductive layer 14 in the electromagnetic shield sheet 11 described above, and there is no particular limitation in the present invention.

The adhesive layer 25 is provided for adhering the electromagnetic shield joint tape 21 to a wall base surface or the like. The adhesive may be of any type, and may be, for example, a solvent-based adhesive, a heat-sensitive adhesive, or a moisture-curable adhesive, but a pressure-sensitive adhesive (pressure-sensitive adhesive) in view of storage stability and workability. Is the easiest to use. A release paper (separator sheet) may be attached to the surface of the adhesive layer 25 as needed, and the release paper is peeled off and used at the time of construction.

In addition, it is also effective to use rewetting paste for the adhesive layer 25 from the viewpoint of achieving both the above-mentioned storability and workability. Since it is dry when stored, it does not have adhesiveness,
Moisture is applied at the time of construction to develop adhesiveness, and after being adhered to the wall surface, etc., it is fixed by drying.

Since the rewetting paste has poor adhesion to the plastic film or the metal film forming the conductive layer 24, the adhesive layer 25 made of the rewetting paste is previously used as a paper layer 26 such as thin paper.
It is preferable that one surface of the paper layer 26 is coated and dried, and the other surface of the paper layer 26 is laminated on the surface of the conductive layer 24 with an appropriate adhesive layer 27 (FIG. 3).

Base material 2 of this electromagnetic shield joint tape 21
A printed layer 28 having a desired pattern may be provided on the surface of 2 (the surface opposite to the adhesive layer 25) (FIG. 4).
In particular, when the electromagnetic shield joint tape 21 is provided with the printed layer 28 having the same or similar pattern or color as the printed layer 16 of the electromagnetic shield sheet 11, when the electromagnetic shield construction method of the present invention is applied as described later, Electromagnetic shield sheet 1
Even if there is a gap between the two, the printed layer 28 of the electromagnetic shield joint tape 21 can be seen in the gap,
It is possible to alleviate the sense of incongruity in design due to the interruption of the pattern of the print layer 16 of the electromagnetic shield sheet 11.

As shown in FIG. 5, the electromagnetic shield construction method of the present invention using the electromagnetic shield sheet and the electromagnetic shield joint tape described in detail above is such that, as shown in FIG. The electromagnetic shield joint tape 32 is attached along a place where the shield sheet 33 is planned to become the joint portion 34. Thereafter, a plurality of electromagnetic shield sheets 33 are bonded to each other, and a joint portion 34 between them is attached to the wall base surface.
2 Position so that it is on top, and construct by the above-mentioned butt method or lap cutting method.

In the conventional electromagnetic shield construction method (FIG. 6) using only the electromagnetic shield sheet without using the electromagnetic shield joint tape, in a slight gap at the joint 43 between the electromagnetic shield sheets 42 as the interior finishing material, The underlying surface of the wall of the gypsum board 41 or the like is exposed, and electromagnetic leakage occurs because the gap portion is not electromagnetically shielded.

On the other hand, according to the electromagnetic shield construction method of the present invention, as shown in FIG. 5, even a slight gap in the joint portion 34 between the electromagnetic shield sheets 33 is attached below the electromagnetic shield sheet 33. Electromagnetic shield joint tape 32
The electromagnetic shield prevents electromagnetic waves from leaking through the gap.

The electromagnetic shield joint tape can be used not only on the joints between the electromagnetic shield sheets as the interior finishing material on the interior wall surface, but also on the ceiling surface and the floor surface. It is also effective for the purpose of preventing electromagnetic wave leakage from the gap between various members having an electromagnetic shielding property.

For example, in an indoor space as shown in FIG. 9, a portion of the floor surface 72, the wall surface 73, and the ceiling surface 74 where the interior finishing material having electromagnetic shielding properties is joined (a portion indicated by a thick broken line in the figure). ), The electromagnetic shield joint tape 71 is attached, and the ceiling surface 74 and the wall surface 73 (surrounding edge), the wall surface 73 and the floor surface 72 (skirting board), the wall surface 73 and the window (window frame), the wall surface 73 and the door (door) Attach the electromagnetic shield joint tape along the area where different members come into contact, such as the frame).

Thereafter, the electromagnetic shield sheet 81 as an interior finishing material is applied to each surface and each member having an electromagnetic shield performance is applied, and the electromagnetic shield treatment is applied to the interior of the room. The space is completed. Like the wall surface 73, the ceiling surface 74 is preferably constructed by using the above-mentioned electromagnetic shield sheet as an interior finishing material. However, on the floor surface 72, the electromagnetic shield joint tape and the electromagnetic shield sheet (the makeup layer and the printing layer are It is also possible to apply a floor material such as ordinary tile carpet after applying the electromagnetic shield treatment in (unnecessary), and without using the electromagnetic shield sheet, the joint part is attached to the place where the electromagnetic shield joint tape is attached. As described above, a flooring material having a conductive layer such as a metal foil or a metal powder-containing layer and having electromagnetic shielding performance may be applied.

[0052]

EXAMPLES Next, the present invention will be described in more detail with reference to specific examples. The present invention is not limited to these examples.

[Electromagnetic Shielding Sheet A] A conductive paper was laminated on the backing paper for wallpaper by polyethylene ruder lamination.
Next, after coating the conductive paper with vinyl chloride resin sol, printing, heat foaming, and embossing were performed to prepare an electromagnetic shield sheet A.

[Electromagnetic shield sheet B] Conductive paper was laminated on the backing paper for wallpaper by the polyethylene ruder laminating method. Next, after coating ethylene vinyl acetate resin sol containing a foaming agent on the conductive paper, printing,
Heat-foaming and embossing were performed to produce an electromagnetic shield sheet B.

[Electromagnetic Shield Sheet C] A backing paper for wallpaper and an aluminum foil having a thickness of 20 μm were laminated by a dry laminating method. Then on the aluminum foil,
An electromagnetic shield sheet C was prepared by laminating thin paper coated paper having a basis weight of 30 g / m ² which was previously printed on one side by a dry laminating method.

[Electromagnetic shield sheet D] A 12 μm thick aluminum vapor-deposited PET film was laminated on a backing paper for wallpaper by a dry lamination method. Next, an olefin resin decorative sheet was laminated on the aluminum vapor-deposited PET film by a dry lamination method to prepare an electromagnetic shield sheet D.

[Electromagnetic shield joint tape E] Thickness 12 μ
m of polyethylene terephthalate resin (PET) film was vapor-deposited with aluminum, and a thin paper having a basis weight of 23 g / m ² was laminated on the aluminum vapor-deposited surface of the conductive film by a dry lamination method. Further, after adhesively processing the PET film surface, it was cut into a width of 50 mm to produce an electromagnetic shield joint tape E.

[Electromagnetic shield joint tape F] Thickness 12 μ
A thin paper having a basis weight of 23 g / m ² was laminated on the aluminum vapor-deposited surface of a conductive film obtained by vapor-depositing aluminum on a PET film of m by a dry lamination method. The PE
T-film surface, one side pre-rewetting process applied basis weight 2
3g / m ² thin paper is laminated by dry lamination method,
A width of 50 mm was cut to prepare an electromagnetic shield joint tape F.

[Electromagnetic shield joint tape G] Thickness 20 μ
One side of m aluminum foil is laminated with a dry-laminating method with thin paper having a basis weight of 23 g / m ² which has been re-moistened on one side in advance, and the other side is pre-printed on one side with a basis weight of 30 g / M ² thin paper coated paper was laminated by a dry laminating method and cut into a width of 50 mm to prepare an electromagnetic shield joint tape G.

[Electromagnetic shield joint tape H] Thickness 20 μ
Thin paper having a basis weight of 23 g / m ² was laminated on both sides of a copper foil of m by a dry lamination method and cut into a width of 50 mm to prepare an electromagnetic shield joint tape H.

[Confirmation of Electromagnetic Shielding Effect] The electromagnetic shielding effect of the electromagnetic shielding construction method using the above electromagnetic shielding sheet and the electromagnetic shielding joint tape was confirmed by the following experiments.

As shown in FIG. 5, the electromagnetic shield joint tape E was attached to the surface of the gypsum board as the wall base material in a cross shape in the vertical and horizontal directions. The electromagnetic shield sheet A was affixed on it, abutting it so that a joining part might become the center of the electromagnetic shield joint tape E, and it was set as the sample for measurement.

On the other hand, as shown in FIG. 6, without attaching the electromagnetic shield joint tape to the surface of the gypsum board, only the electromagnetic shield sheet A was attached while being butted so as to have a similar joint portion, for comparison. It was used as a sample.

As shown in FIG. 8, a double-structured peripheral wall composed of two metal plates 63 is used, and the amount of radio wave attenuation between the inside and outside is 10
Create an anechoic chamber 64 that is 0 dB or more, and
Sample (measurement sample or comparison sample) on the test piece window 65 of 4
Was fixed by the fixing device 62. The fixing device 62 is attached to the anechoic chamber 64 without reducing the radio wave attenuation capacity of the sample to be measured. A radio wave in the 1.0 to 8.0 GHz band with a known transmission level is sent from the test radio wave transmitter 66 toward the sample, transmitted to the anechoic chamber 64 through the sample, and the reception level in the anechoic chamber 64 is received. It was measured by the machine 67. The radio wave attenuation amount (dB) of the sample was calculated from the difference with the measured value of the reception level of the test radio wave with the sample removed.

The measurement results are shown in FIG. The measurement sample of the electromagnetic shield construction method according to the present invention showed a high radio wave attenuation amount of about 60 dB in the entire band of 1.0 to 8.0 GHz, while the radio wave attenuation by the comparative sample using only the electromagnetic shield sheet. The amount was only about 30 dB in the same band. In addition, when the measurement samples and the comparison samples were tested with various combinations of the electromagnetic shield sheets A to D and the electromagnetic shield joint tapes E to H, the measurement samples were compared with each other. The radio wave attenuation is 25 to 35 dB higher than the
An excellent electromagnetic wave attenuation amount of about 60 dB was exhibited.

[Construction Experiment] The conference room M in the office building of reinforced concrete construction has walls, ceilings as wallpaper (base is plasterboard), floor is tile carpet (base is concrete slab), and doors are steel doors and windows. There was no space, and it was possible to talk with PHS and mobile phones even when the door was closed.

As in the case of ordinary reforming, after removing the wallpaper and smoothing the plasterboard surface, as shown in FIG.
The electromagnetic shield joint tape E was attached at an interval of 900 mm, which is the construction width of the electromagnetic shield sheet A. Further, the electromagnetic shield joint tape E was applied to the corners, the ceiling and wall surfaces, the floor and wall surfaces where the sheet joining surfaces come, and the portion between the door frame and the wall surface. At the same time, the tile carpet on the floor surface was removed, and the same treatment was applied to the floor base surface.

Next, as shown in FIG. 8, the electromagnetic shield sheet (width 92
The electromagnetic shield sheet A was applied to the wall surface and the ceiling surface, and the electromagnetic shield sheet C (however, no printing was applied) was applied to the floor base surface by the overlapping cutting method while adjusting so that the joint surface of 0 mm) would come. . Thereafter, tile carpets were laid on the electromagnetic shield sheet C on the floor base surface, and the floor surface was constructed.

After the electromagnetic shield construction was completed, when a call was attempted by the PHS and the mobile phone with the door closed, all were in a non-communication state, and the electromagnetic shield effect was confirmed.

For comparison, the construction of the electromagnetic shield joint tape is omitted in the other conference room N under the same conditions,
When using only the electromagnetic shield sheet, the electromagnetic shield construction was performed in the same manner as above, and after the construction was completed, an attempt was made to talk by PHS and a mobile phone with the door closed,
It was confirmed that the PHS and mobile phones were in a state in which communication was possible for the time being, although the radio waves were weak and a little difficult to communicate, and the electromagnetic shielding effect was insufficient.

[0071]

As described above, in the method of the present invention, a space having a high electromagnetic shield performance can be easily constructed by using the electromagnetic shield sheet and the joint tape together. Further, the following effects are obtained as compared with the usual electromagnetic wave shield construction method.

(A) Since the material unit price is low, it can be manufactured at low cost. (B) The work of sticking to the wall surface is easy, and the man-hours for constructing the electromagnetic shield can be reduced and the construction cost can be reduced. (C) It is possible to shorten the construction period of the electromagnetic shield construction. (D) It can be installed by general interior contractors such as master craftsmen, regardless of the electromagnetic shield specialist. (E) With simple construction, it is possible to provide the interior of the electromagnetic shield with an excellent radio wave attenuation amount of approximately 60 dB in the 1.0 to 8.0 GHz frequency band. (F) Since the construction method is almost the same as that of normal wallpaper, it can be easily applied not only to new construction but also to renovation of existing office buildings.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an electromagnetic shield sheet used in the electromagnetic shield method of the present invention.

FIG. 2 is a cross-sectional view showing an example of an electromagnetic shield joint tape used in the electromagnetic shield construction method of the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of an electromagnetic shield joint tape used in the electromagnetic shield construction method of the present invention.

FIG. 4 is a cross-sectional view showing another embodiment of an electromagnetic shield joint tape used in the electromagnetic shield construction method of the present invention.

FIG. 5 is an explanatory view showing an interior finish state by the electromagnetic shield construction method of the present invention, where the left figure is a sectional view and the right figure is a front view.

FIG. 6 is an explanatory view showing an interior finish state by a conventional electromagnetic shield construction method using only an electromagnetic shield sheet,
The left figure is a sectional view and the right figure is a front view.

FIG. 7 is a graph showing radio wave attenuation measurement results of an interior finish material by the electromagnetic shield construction method of the present invention and an interior finish material by the electromagnetic shield construction method using only an electromagnetic shield sheet.

FIG. 8 is a cross-sectional view illustrating a method of measuring an electromagnetic shield effect.

FIG. 9 is a sketch drawing showing an example of construction of an electromagnetic shield joint tape in a room in the electromagnetic shield construction method of the present invention.

FIG. 10 is a sketch showing an example of construction of an electromagnetic shield sheet indoors in the electromagnetic shield construction method of the present invention.

[Explanation of symbols]

11 ... Electromagnetic shield sheet 12 ... Base material 13 ... Adhesive layer 14 ... Conductive layer 15 ... Makeup layer 16 ... Printing layer 21 ... Electromagnetic shield joint tape 22 ... Base material 23 ... Adhesive layer 24 ... Conductive layer 25 ... Adhesive layer 26 ... Paper layer 27 ... Adhesive layer 28 ... Printing layer 31 ... Gypsum board 32 ... Electromagnetic shield joint tape 33 ... Electromagnetic shield sheet 34 ... Joint 41 ... Gypsum board 42 ... Electromagnetic shield sheet 43 ... Joint 61 ... Sample 62 ... Fixing device 63 ... Metal plate 64 ... Anechoic chamber 65 ... Mounting window 66 ... Test radio transmitter 67 ... Test radio receiver 71 ... Electromagnetic shield joint tape 72 ... Floor 73 ... Wall surface 74 ... Ceiling surface 81 ... Electromagnetic shield sheet

Continued front page    F-term (reference) 2E001 DH01 FA03 FA14 FA32 FA33                       GA23 GA24 GA25 GA27 GA28                       GA76 HB02 HB04 HB05 HC07                       HD00 KA01 KA08 LA04 MA02                       MA04                 5E321 AA43 AA44 AA46 BB23 CC16

Claims (9)

[Claims] 1. An electromagnetic shield construction method for forming an electromagnetic shield space by a conductive material in a room, wherein an electromagnetic shield sheet having a conductive layer is used as an interior material for a wall surface and a ceiling surface, and the electromagnetic shield sheets are mutually protected. An electromagnetic shield construction method characterized in that an electromagnetic shield joint tape having a conductive layer is provided at a joint portion between them. 2. An electromagnetic shield construction method for forming an electromagnetic shield space by a conductive material in a room, which comprises a ceiling surface and a wall surface (surrounding edge), a wall surface and a floor surface (skirting board), a wall surface and a window (window frame),
An electromagnetic shield construction method characterized in that an electromagnetic shield joint tape having a conductive layer is provided at a position where different members such as a wall surface and a door (door frame) are in contact with each other. 3. The electromagnetic shield joint tape has a thickness of 20.
The electromagnetic shield construction method according to claim 1 or 2, wherein the width is 30 to 100 µm and the width is 30 to 100 mm. 4. The electromagnetic shielding joint tape comprises (A) paper layer, (B) adhesive layer, (C) conductive layer, and (D) adhesive layer. The electromagnetic shield construction method described in 2 or 3. 5. The paper layer (A) has a basis weight of 20 to 40 g / m.
^2. The electromagnetic shield construction method according to claim 4, wherein the thin paper is ² . 6. The conductive layer (C) is a polyethylene terephthalate resin film having a thickness of 12 to 50 μm and provided with an aluminum vapor deposition layer.
Or the electromagnetic shield construction method described in 5. 7. The electromagnetic shield construction method according to claim 4, wherein the (D) adhesive layer is a pressure-sensitive adhesive layer. 8. The (D) adhesive layer is a rewetting paste layer, and the (D) adhesive layer is provided with the (C) conductive layer through the (E) paper layer and the (F) adhesive layer. The electromagnetic shield construction method according to claim 4, 5 or 6, which is laminated in layers. 9. The electromagnetic shield construction method according to claim 4, wherein the (A) paper layer is provided with a design by printing.