JPH01319998A - Electromagnetic-wave shielding coarse sheet - Google Patents

Abstract

PURPOSE:To obtain an electromagnetic-wave shielding coarse sheet having stable electromagnetic shielding properties and antistatic properties by coating at least the exposed surface of a thread strip constituting a coarse fabric-shaped foundation with a conductive coated layer. CONSTITUTION:With a coarse fabric-shaped foundation used for an electromagnetic-wave shielding coarse sheet, the layer of mutually parallel warp 6 is superposed onto a layer composed of mutually parallel weft 5 so that the direction of warp and the direction of weft cross at right angles, and these warp 6 and weft 5 are bound by binding yarn 7. The mutually crossed warp 11 and weft 12 of the coarse sheet are brought into contact directly and reciprocally. The exposed circumferential surfaces of warp 11 and weft 12 are coated with conductive coated layers 13, and the crossed sections of warp 11 and weft 12 are wrapped in by the conductive coated layers, and bound and fixed integrally, thus improving conductivity, then preventing grain displacement and thread cast-off.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coarse sheet with electromagnetic shielding properties. More specifically, the present invention provides excellent
The present invention also relates to a rough-hewn sheet that has stable electromagnetic shielding properties, excellent air permeability and bending strength.

[Prior art and problems to be solved by the invention] Conventionally, flexible sheets made from various synthetic resins, natural or synthetic rubber materials have been used as covers, partitions, and other flexible covering materials for equipment. Many of these materials are reinforced with fiber materials. However, these conventional flexible sheets are electrically insulating in nature and generally have a
It has a specific resistance value of I0 to 1017 ΩcIn, and most of these have a specific resistance value of 1012 Ω mark or more. Therefore, when these conventional flexible sheets are rubbed, static electricity is generated, which makes handling of the flexible sheets difficult and may have an adverse effect on electrical and electronic equipment.

Furthermore, with the development and popularization of electrical and electronic devices, prevention of electrical and electromagnetic interference and prevention of static electricity that occur in these devices have become important issues to be solved.

Conventional electromagnetic shielding sheeting materials are generally tetraconducting non-breathable films or sheets with a matrix of flexible polymeric materials, which are non-transparent, non-ventilable, non-porous, and acoustically insulating. It was something to do.

Other sheet materials for electromagnetic shielding include wire mesh and metal mesh, but these metal materials are hard and have poor shape changeability, and are easily broken by repeated bending, resulting in poor electromagnetic shielding properties. There are problems such as stability.

Furthermore, as other sheet materials for electromagnetic shielding, fiber materials plated or vapor-deposited with conductive metals are known, but these are extremely expensive and have limited practical uses, and are not suitable for industrial use. It was difficult to put it into practical use as a shielding material, partition material, or covering material.

The object of the present invention is to provide electromagnetic shielding properties that have excellent and stable electromagnetic shielding properties and antistatic properties, have excellent ventilation and ventilation, are easy to bend, have excellent bending strength, and are inexpensive. The purpose is to provide a coarse sheet.

[Means and actions to solve the problem]

The electromagnetic wave shielding coarse sheet of the present invention has at least warp yarns arranged in parallel with each other with a gap between the yarns,
The main component is a mixture of a coarse woven base fabric composed of two threads including a weft and a weft, a matrix made of a flexible polymer material, and a conductive material, and has an inherent resistance of 10'Ωcm or less. and a conductive coating layer having a resistance value, wherein the conductive coating layer covers at least the exposed surface of the yarn constituting the base fabric.

In the electromagnetic wave shielding coarse sheet of the present invention, the conductive coating layer covers only the exposed surface of the yarn in the base fabric,
In addition, it may wrap the intersections of the threads and bind them together, or it may cover the entire surface of the threads constituting the base fabric.

Further, the electromagnetic wave shielding coarse sheet of the present invention contains a flexible polymer material having insulation properties as a main component, and has 108
The insulating coating layer has a specific resistance value larger than Ωcm,
It may be formed on the conductive coating layer.

Further, the electromagnetic wave shielding coarse sheet of the present invention contains as a main component a mixture of a matrix made of a flexible polymer material and at least one selected from conductive materials and semiconductive materials, and Even if a semiconductive coating layer is formed on the conductive coating layer and has a specific resistance value within the range of 10Q゛ΩG and higher than the specific resistance value of the conductive coating layer. good.

The coarse woven base fabric used in the electromagnetic wave shielding coarse sheet of the present invention is composed of yarns including at least warp yarns and weft yarns arranged in parallel with each other with gaps between the yarns. That is, the PIl base fabric may be a biaxial fabric consisting of warp and weft yarns, a triaxial fabric containing other threads, or a four-axial fabric.

There is no particular limitation on the structure of the coarse base fabric as described above, and it can be selected from coarse woven fabrics, knitted fabrics, and woven or knitted fabrics. Such coarse-grained fabrics include, for example, a plain weave fabric consisting of a warp 1 and a weft 2 as shown in FIG.
As shown in the figure, the weft thread 3 is intertwined and connected with two warp threads 4a and 4b, or a third weave is used.
As shown in the figure, a layer of mutually parallel warp threads 6 is superimposed on a layer of mutually parallel weft threads 5 such that the warp and weft directions are perpendicular to each other. A leno weave or the like in which the warp yarns 6 and the weft yarns 5 are tied together by a leno thread 7 is preferable.

The base fabric used in the present invention has a coarse mesh, and the warp and weft have a distance of about 0.1. It is preferable to form a gap of ~10 mm, and this interyarn gap is 0.1~5. More preferably, it is fi.

That is, the area of the gap space formed between the warp and weft is preferably about 0.07 to 700 mm'', and more preferably 0.0.1γ25 mm2.

Of course, the shape of the inter-row space is not limited to a rectangular shape, but may be of any shape depending on the base fabric structure.゛Generally, the base fabric used in the present invention has a weight of 20 to 500 g/m
It is preferable to have a basis weight of 40 to 300ε/f.
f? It is more preferable to have a basis weight of .

The threads constituting the coarse base fabric of the present invention are not particularly limited, and include natural fibers such as cotton and linen, inorganic fibers such as glass fiber, and recycled fibers such as viscose rayon and cupro. Semi-synthetic fibers, such as g- and tri-acetate fibers, and synthetic fibers, e.g.
TM products such as nylon 6 fiber, nylon 66 fiber, polyester (polyethylene terephthalate, etc.) fiber, water-insolubilized polyvinyl alcohol fiber (vinylon), aromatic polyamide fiber, aromatic polyester fiber, acrylic fiber, polyvinyl chloride fiber, and polyolefin fiber. A material consisting of at least one type of fiber selected from those that can be used for formation is used.

Furthermore, the fiber yarn may be any of short fiber spun yarn, long fiber yarn, split yarn, tape yarn, monofilament yarn, etc., but it is one that can effectively support the polymer material coating agent in as large a quantity as possible. It is preferable that

When multifilament yarn is used as the yarn for coarse base fabric, polyethylene terephthalate multifilament yarn of 100 to 5000 denier (melting point = about 260°C) and vinylon, multifilament yarn (thermal decomposition at about 220 to 230°C) are used. It is preferred because it has excellent strength.

In the coarse sheet of the present invention, the coarse base fabric may be covered with a conductive coating layer. In this case, the exposed peripheral surfaces of the yarns constituting the coarse base fabric are covered with the conductive coating layer, and the yarn intersections are wrapped and bound together by the conductive coating layer.

In the coarse sheet shown in FIG. 4, warp yarns 11 and weft yarns 12 that cross each other are in direct contact with each other. Warp 11
The exposed peripheral surfaces of the weft yarns 12 are covered with a conductive coating layer 13, and the intersections of the warp yarns 11 and the weft yarns 12 are wrapped in the conductive coating layer and fixed together, so that the conductive This prevents misalignment and thread pulling.

The coarse sheet of the present invention may be composed of threads whose entire surface is covered with a conductive coating layer. In this case, the yarns come into contact at the intersections of the yarns through the conductive coating layer covering each yarn.

In the coarse sheet shown in FIG.
The warp yarns 11 and the weft yarns 12 are in contact with each other at their intersections via a conductive coating layer 13 that covers them.

The conductive coating layer mainly includes a mixture of a matrix made of a flexible (easily bent) polymeric material and a conductive material dispersed in the matrix.

The flexible polymer material used as the matrix contains at least one selected from flexible synthetic resins, synthetic rubbers, and natural rubbers, and examples of preferred synthetic resins include polyvinyl chloride. (PVC), polyurethane, ethylene-vinyl acetate copolymer, isotactic polypropylene, polyethylene, polyacrylonitrile, polyester, silicone, fluorine-containing polymer, polyamide, and other known materials. In addition, as an example of preferable synthetic rubber, styrene-butadiene rubber (S
BR), chlorosulfonated polyethylene rubber, polyurethane rubber, butyl rubber, silicone rubber, fluorine-containing polymer rubber, isoprene rubber, and other known materials. The most preferred synthetic resin is PVC, which may contain plasticizers, fillers, colorants, stabilizers and/or other modifiers.

It is generally preferred that the polymeric material constituting the matrix has a melting point at least 5°C, preferably 10°C to 20°C, lower than the melting point or thermal decomposition temperature of the base yarn.

The conductive material mixed into the matrix may be in the form of liquid, powder, fiber, foil, or wire, and is generally carbon black, graphite, carbon fiber, metal, etc., such as A7! .

Au, Ag, Pt, Cu, Cr,
Ni, Zn, Ti, Pb + Sn,
Pds and alloys containing at least one of these, powders of compounds, fibers, powders of conductive compounds such as indium oxide, various conductive amorphous metals, and powders of amorphous metals plated with conductive metals, You can choose from fibers, etc.

The amount of the conductive material in the conductive coating layer is not particularly limited as long as the resulting conductive coating layer has the desired conductivity, but it depends on the conductivity, properties, and desired conductivity value specific to the material. The content is generally preferably 5% by weight or more, more preferably 10 to 70% by weight. Of course, the amount of the conductive material may be greater than 70% by weight as long as it does not impede the performance of the resulting conductive coating layer.

There is no particular limitation on the weight of the conductive coating layer as long as it exhibits the desired performance, but it generally ranges from 50% to 3% of the weight of the coarse base fabric.
00% is preferable, and 70 to 200% is more preferable.

To form the conductive coating layer, a dipping method is used in which a coarse base fabric is immersed in a coating solution or emulsion containing a predetermined amount of a matrix polymer material and a conductive material and squeezed to a predetermined degree;
Alternatively, spraying, coating, brushing or other known methods can be used.

The coating solution, or emulsion, contains, in addition to the matrix polymeric material and the conductive material, customary additives such as flame retardants (e.g. antimony trioxide), antifouling agents, color pigments,
It may also contain antioxidants, ultraviolet absorbers, and other additives. Further, desired characters or patterns may be added to the coarse sheet of the present invention using ink, pigment, dye, or the like. Furthermore, desired performance can be easily added to the sheet of the present invention by applying various chemicals such as antifouling agents.

In the coarse sheet of the present invention, the conductive coating layer is 105Ω
It has a specific resistance value of less than 10° C, preferably less than 101 ohms, more preferably less than 10' ohms, and generally 10°
It has a specific resistance value of ~10-3 Ωcm.

When the resistivity value of the conductive coating layer is higher than 10'Ωcm, the electromagnetic wave shielding properties of the coarse sheet obtained will be insufficient.

In the coarse sheet of the present invention, for example, as shown in FIG.
4 may be coated.

This insulating coating layer is formed mainly of an electrically insulating flexible polymer material, and this polymer material is made from the polymer material forming the matrix of the conductive coating layer. The insulating coating layer may be formed only on the exposed surface of the conductive coating layer-coated yarn, or may be formed on the entire surface thereof.Generally, the former is It is preferable that there be.

The insulating coating layer has a resistance higher than 108Ω, preferably 10Ω.
It has a specific resistance value of OΩG or more, more preferably 1012Ω or more. The insulating coating layer is effective in preventing electrical leakage of the coarse sheet of the present invention. If the specific resistance value of the insulating coating layer is less than 10 days Ωω, the leakage prevention effect of the resulting coarse sheet will be insufficient.

The coarse sheet of the present invention may have a semiconductive coating layer 14 covering the conductive coating layer 13, as shown in FIG. 6, for example. Of course, the semiconductive coating layer is
It may be formed only on the exposed surface of the conductive coating layer, or it may be formed on the entire surface of the yarn.

The semiconductive coating layer mainly includes a mixture of a matrix made of a flexible polymeric material and at least one selected from conductive and semiconductive materials dispersed in the matrix. The flexible polymeric material may be selected from flexible polymeric materials for forming the matrix of the electrically conductive covering layer, and the electrically conductive material may be selected from the electrically conductive materials for the electrically conductive covering layer. can.

Additionally, semiconducting materials can be selected from silver bromide, silicon, germanium, conductive organic compounds, etc. in liquid, powder, fibrous, and foil form.

Examples of l-based organic compounds include polycarboxylic acid ester compounds of mono- and poly-alkylene glycol monoalkyl ethers, and examples thereof include the following general formula (r):
, (II) and (■):Z' (COO(^5o
)r Rs) nz (III) (However, in the above formula, X is selected from aliphatic, alicyclic and aromatic polybasic acid residues with and without substituents having 2 to 8 carbon atoms. Y represents a member selected from epoxidized cyclohexane rings with and without substituents; Z represents aliphatic, alicyclic and aromatic rings having 2 to 22 carbon atoms; Represents a member selected from polybasic carboxylic acid residues, including A+, Az, A3, As and A.

each independently represents a member selected from alkylene groups having 2 to 4 carbon atoms; R,, R2;

R, , R, and R3 each independently have a carbon number of 1
represents a member selected from ~15 linear and branched alkyl groups, provided that the total number of carbon atoms N of A1 and R2, AXR2 and A3 and R3 is 5 to 17, m,, R
2, R3 and R4 each independently represent an integer of 1 to 7, and n.

represents an integer of 1 to 5, R2 represents 1 or an integer of 3 to 6, i represents an integer of 1 to 7, and R2 represents 3
In the case of ~6, l and R2 in the nz C00(AsO)r Rs groups may be different from each other or may be the same. ) includes a group of compounds represented by

The mono- and poly-alkylene glycol monoalkyl ethers used in the production of the above-mentioned conductive ester compound include propatool and 1 to 7 moles of ethylene oxide, 1 to 4 moles of propylene oxide, or 1 to 4 moles of butylene oxide.
Addition compound with 3 moles: Addition compound between butanol and 1 to 6 moles of ethylene oxide, 1 to 4 moles of propylene oxide, or 1 to 3 moles of butylene oxide: Addition compound of hexanol with 1 to 5 moles of ethylene oxide, 1 mole of propylene oxide
-3 mol or addition compound with 1-2 mol of butylene oxide: heptanol with 1-5 mol of ethylene oxide, 1-3 mol of propylene oxide or 1-2 mol of butylene oxide
Addition compound with octanol and 1 to 4 mol of ethylene oxide, 1 to 3 mol of propylene oxide or 1 to 2 mol of butylene oxide: Addition compound of nonanol with 1 to 4 mol of ethylene oxide, 1 to 2 mol of propylene oxide
mol° or addition compound of nidodecanol with 1 to 2 mol of butylene oxide, 1 to 3 mol of ethylene oxide, 1 to 2 mol of propylene oxide or 1 mol of butylene oxide, or addition compound of nidodecanol with 1 to 2 mol of ethylene oxide, 1 mol of propylene oxide or Butylene oxide 1
Addition compound between nitridecanol and 1 to 2 moles of ethylene oxide, 1 mole of propylene oxide or 1 mole of butylene oxide: Addition compound between tetradecanol and 1 mole of ethylene oxide or 1 mole of propylene oxide: and pentadecano- Examples include addition compounds of 1 mole of ethylene oxide and 1 mole of ethylene oxide.

Further, dicarboxylic acids used in the production of the conductive ester compound of formula (I) include adipic acid, azelaic acid, sebacic acid, succinic acid, brassylic acid, tetrahydrophthalic acid, phthalic acid, and the like.

In addition, the carboxylic acids used in the production of the conductive ester compounds of formulas (n) and (I It is an acid. These carboxylic acids may have a substituent containing a lower alkyl group such as a methyl group or an ethyl group, a hydroxyl group, or a heteroatom such as oxygen, silicon, or halogen.

As the monocarboxylic acid, an aliphatic monocarboxylic acid having 2 to 22 carbon atoms can be used. Furthermore, the polybasic acid is an aliphatic, alicyclic, or aromatic polybasic acid consisting of a carboxylic acid residue having 3 to 8 carbon atoms, and specifically, citric acid,
Aliphatic polycarboxylic acids such as aconitic acid, butane-1-dicarboxylic acid, and butanetetracarboxylic acid, alicyclic carboxylic acids such as epoxyhexahydrophthalic acid, and aromatic polycarboxylic acids such as trimellitic acid and pyromellitic acid. Acids, acid anhydrides of these carboxylic acids, etc. can be used.

These carboxylic acids may be used alone or as a mixture of two or more.

The semiconductive coating layer is effective in preventing both electric leakage and electrostatic charging of the coarse sheet of the present invention, and has a thickness of 108
It has a specific resistance value of ~102 Ωcm, preferably 108 to 105 Ωcm, more preferably 107 to 106 Ωcm. If the specific resistance value of the semiconductive coating layer is higher than 108, it will show electrical insulation and the antistatic effect will be insufficient, and if it is lower than 102Ωc111, it will show conductivity as a whole and the leakage prevention effect will be insufficient. becomes.

There are no particular limitations on the weight and JV of the insulating coating layer and the semiconductive coating layer as long as they match the use and purpose. Generally, the weight is preferably within the range of 1 to 50%, and even more preferably within the range of 5 to 30%, based on the weight of the base fabric.

The coarse sheet of the present invention has a coarse base fabric and at least a conductive coating layer as described above, and generally includes:
A base fabric made of coarse fabric is coated with a conductive coating material. However, in the sackcloth sheet of the present invention, at least a conductive coating layer is formed on the entire surface of the yarn, and the resulting conductive coating layer-coated yarn is woven and knitted into a coarse sheet having a desired coarse structure. -Or it may be woven or knitted.

Generally, the insulating coating layer or the semiconductive coating layer is preferably formed on the exposed surface of the conductive coating layer of the base fabric having the conductive coating layer.

In the coarse sheet of the present invention, the conductive coating layer and, if necessary, at least one of the insulating coating layer and the semiconductive coating layer may be a porous body. The porous coating layer is
This is effective in controlling the flexibility, flexibility, cushioning properties, etc. of the coarse sheet to desired levels.

In the coarse-grained sheet of the present invention, the covering layer containing the flexible polymer material preferably has a cross-sectional shape flat with respect to the sheet plane.

In this flat cross-sectional shape, the ratio (6+)/(62
) is preferably within the range of 1.3:I to 7:I. A sheet having such a flat cross section has excellent handling properties due to its excellent flatness, low bulk, and excellent conformability to the installation surface. Such a flat yarn sheet may be obtained by coating the coarse base fabric with a predetermined coating layer and subjecting the resulting coating sheet to a pressure flattening treatment. In addition, without actively applying pressure and flattening treatment,
In order to achieve flattening of the yarn, use a yarn suitable for flattening, for example, a non-twisted yarn made of multifilament, a lightly twisted yarn, or a double twisted yarn or a lightly twisted double yarn of these yarns. It is often preferable to use a multifilament yarn with a twist number of 120 t/m or less, particularly one with a twist number of 100 t/m or less, for example 50 to 100 t/m. However, yarns suitable for flattening are not limited to those mentioned above, and may be, for example, spun yarns, or yarns that originally have a flat cross-sectional shape, such as drawn twin yarns,
Alternatively, a coarse base fabric is produced using an uncoated yarn having a flat cross-sectional shape as described above, which may be a lightly twisted twin yarn, etc.
A predetermined coating may be applied to this.

The coarse sheet of the present invention can be thermally bonded depending on the characteristics of the polymer material in the coating layer forming its surface.

Further, the density of the warp and/or weft in the both-edge portions of the coarse sheet or the portion to be sewn may be made higher than that in other portions to increase the shear adhesive strength of this portion.

Furthermore, the weft yarns of the coarse sheet of the present invention may be curved in an arc shape, thereby increasing the shear adhesive strength of the heat bonded portion.

〔Example〕

The electromagnetic shielding coarse sheet of the present invention will be further explained with reference to the following examples.

Actual drawing 191 Using polyester multifilament yarn for the weft, a woven fabric having the composition shown in FIG. 2 was created. Its structure is as follows, and the average size of the inter-yarn gap is 3.
．． 500 denier / 5 w x 3.5 mm
2 x 1000 denier / 27 x 7 (pieces / 25.4 dragons) This coarse base fabric has the following composition: p v c too weight part 1 same a
50 1) QP
(Plasticizer) 80〃 Stabilizer 1〃Antimony oxide (flame retardant) 30〃 Pigment (green) 2〃Trichlene Immerse in 50〃 polymer composition treatment solution, squeeze, dry to gel, and thoroughly The composition was applied to a coarse base fabric. As a result, 10
An electrically conductive coating layer of 0% by weight was obtained.

The specific resistance value of this conductive coating layer was 10-2 Ωcm.

The obtained coarse sheet not only exhibited good electromagnetic shielding properties, but also had good air permeability, transparency, and sound permeability.

Back plate 1 The same operation as in Example 1 was performed. However, on the conductive coating layer, an insulating coating composition having the following composition: p v c
ioo weight part DOP,
80 Stabilizer
1 Antimony oxide
30 Green pigment
2. Form a coating layer of 50% trichloride and solidify it to give a coating layer of 15% based on the weight of the base fabric.
% insulating coating layer was formed.

The specific resistance value of the obtained insulating coating layer was 10 days Ωa.

Moreover, the obtained coarse sheet showed good electromagnetic shielding properties, and also showed good air permeability, transparency, and sound permeability.

Practical Example 11 The same operation as in Example 1 was performed. However, on the conductive coating layer, a semiconductive coating liquid having the following composition: P V C100
Part by weight DOP 80 Stabilizer
1 ・Antimony oxide
30 Green pigment
2 Carbon black 8
A coating layer of TRICLEN 50 was formed and solidified to form a semiconductive coating layer having a weight of 15% based on the weight of the base fabric. The specific resistance value of this semiconductive coating liquid was 106Ω mark.

The coarse sheet obtained had good electromagnetic shielding properties, satisfactory leakage prevention properties, and static electricity antistatic properties, as well as good air permeability, transparency, and sound permeability.

The same operation as in Example 1 of Masukura Masuko was performed. However, as a coarse base fabric,
The following structure consisting of water-insolubilized polyvinyl alcohol fiber (vinylon) spun yarn: 5 S/I X 5 S/1 A coarse plain woven fabric of 7 pieces/2.54 pieces x 7 pieces/2.54 cm was used. In the coarse sheet obtained, the weight of the conductive coating layer attached was at a high level of 120% of the weight of the base fabric, and the specific resistance value was 10-2 Ωcm.

In addition, this coarse sheet has good electromagnetic shielding properties, ventilation and
It had ventilation, transparency and sound permeability, and was highly durable.

Point i ′ Polyester multifilament yarn (1000d/
192f) was passed through a melt having the following composition and squeezed with a die to obtain a yarn having a conductive coating layer.

PVC 100 parts by weight copper powder 50 The solid weight of the conductive coating layer was 70% of the weight of the yarn, and its specific resistance was 10-1Ω. Using this coated yarn, A hand-woven fabric with a density of 7 x 7 pieces/inch was created. (Inter-yarn gap: 3.5 am It was temporarily fixed by pressing. The inter-yarn gap of the obtained coarse sheet was approximately 3.0×3. Q mm,
The fixation of the yarn was also good, and the handleability of the coarse sheet and the electromagnetic shielding properties were also good.

Practical Example 111 Regarding the plain woven fabric having the conductive coating layer obtained in Example 5,
An insulating coating layer having a composition similar to that described in Example 2 was formed at a coverage of 10%.

The properties of the obtained coarse sheet, especially the electromagnetic shielding properties, are
The results were as good as in Example 2.

Disaster Prevention 1 Regarding the plain woven fabric having the conductive coating layer obtained in Example 5,
A semiconductive coating layer having a composition similar to that described in Example 3,
It was formed with a coating weight of 10. Characteristics of the obtained coarse sheet,
In particular, the electromagnetic wave shielding property was as good as in Example 3.

1iL For each of Examples 5 and 6.7, coarse sheets were obtained by performing the same treatment as each except that the press treatment was not performed. The coarse sheet obtained was rather bulky and had some difficulties in handling, but other properties were good as in Examples 5 and 6.7.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are explanatory diagrams each showing an example of the structure of the coarse base fabric of the coarse sheet of the present invention, and FIGS. 4, 5, and 6 are respectively FIG. 2 is an explanatory cross-sectional view showing the covering state of the coating layer at the thread intersection of an embodiment of the electromagnetic shielding coarse sheet of the present invention. 1, 4a, 4b, 6.11=warp, 2.3,
5.12... Weft, 7... Leno thread, 13...
- Conductive coating layer, 14... Insulating or semiconductive coating layer. Figure 1 Figure 5 Figure 62

Claims (5)

[Claims] 1. A coarse woven base fabric composed of threads including warp threads and weft threads arranged in parallel with each other with a gap between the threads, a matrix made of a flexible polymer material, and a conductive material. and a conductive coating layer containing as a main component a mixture of Coated with electromagnetic shielding coarse sheet. 2. 2. The electromagnetic shielding coarse sheet according to claim 1, wherein the conductive coating layer covers only the exposed surfaces of the threads in the base fabric, and wraps the intersections of the threads and binds them together. 3. The electromagnetic shielding coarse sheet according to claim 1, wherein the conductive coating layer covers the entire surface of the threads constituting the base fabric. 4. 2. The electromagnetic wave according to claim 1, wherein an insulating coating layer containing a flexible polymer material having insulation properties as a main component and having a resistivity value larger than 10^8 Ωcm is formed on the conductive coating layer. Shielding coarse sheet. 5. Contains as a main component a mixture of a matrix made of a flexible polymer material and at least one selected from conductive materials and semiconductive materials, and 10^2 to 10^8
2. The electromagnetic wave according to claim 1, wherein a semiconductive coating layer is formed on the conductive coating layer, and has a specific resistance value in the range of Ωcm and higher than the specific resistance value of the electroconductive coating layer. Shielding coarse sheet.