JPH03142228A - Rough-mesh sheet excellent in perspective property, air permeability, sound permeability and electromagnetic wave shielding property - Google Patents

Abstract

PURPOSE:To prevent electric interference and electromagnetic interference generated in an equipment by regulating the ratio of length of a cross section of the direction parallel to a sheet plane made of yarn lines coated by a conductive coating layer and length of the cross section of the direction orthogonal to the sheet plane to a range within the specified value. CONSTITUTION:A conductive coating layer 13 has <=10<5> OMEGAcm preferably <=10<1> OMEGAcm specific resistance value and generally has 10<0> - 10-<3> OMEGAcm specific resistance value. A semiconductive coating layer 14 incorporates a matrix made of a flexible copolymer material and a mixture selected from the conductive material and the semiconductive material dispersed in the matrix as a main component. In this flat cross-sectional shape, the ratio of length (l1) of a cross section in the direction parallel to this sheet plane and length (l2) of a cross section in the direction orthogonal to the sheet plane is regulated to a range of (1.3 : 1) - (7 : 1). Thereby the title sheet shows good electromagnetic wave shielding property and has excellent air/wind permeability, perspective property and sound permeability and is made conformable to the installation face and easy in handling.

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 has excellent transparency, air permeability, sound permeability, stable electromagnetic shielding properties, excellent bending strength, flatness, low bulk, and installation surface. This relates to a coarse sheet with excellent conformability to.

[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 equipment covers, partitions, and other flexible covering materials. There are also many sounds that have been reinforced. However, these conventional flexible sheets are essentially electrically insulating and generally have a resistivity value of 1010 to 10I7Ωcm, and most of these have a resistivity value of 1QI2Ω 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 conductive non-breathable films or sheets with a matrix of flexible polymeric materials, which are not transparent, ventilated, and draft-proof, and are acoustically insulating. It was something.

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

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

Furthermore, conventional sheet materials for electromagnetic shielding are bulky and have poor flatness, and therefore have the problem of poor conformability to the installation surface, making them difficult to handle.

The object of the present invention is to have excellent transparency, air permeability, and sound permeability, stable electromagnetic shielding properties, antistatic properties, and leakage prevention properties, easy bending, and excellent bending strength. To provide an electromagnetic shielding coarse sheet that is inexpensive, has high flatness, is low in bulk, is easy to handle, and easily adapts to an installation surface.

[Means and actions to solve the problem]

The coarse sheet of the present invention which has excellent transparency, air permeability, sound permeability and electromagnetic shielding properties is composed of yarns including warp yarns and weft yarns which are arranged in parallel with each other with a gap between the yarns. a conductive covering layer comprising a matrix made of a flexible polymeric material and a mixture of a conductive material as a main component and having a resistivity value of 10'ΩCm or less. A sheet, wherein the conductive coating layer covers at least the exposed surface of the yarn constituting the base fabric, and the yarn covered by the conductive coating layer is arranged such that the yarn covered with the conductive coating layer is It has a flat cross-sectional shape, and the ratio of the cross-sectional length (ffil) in the direction parallel to the sheet plane of this coated yarn to the cross-sectional length (I!, 2) in the direction perpendicular to the sheet plane ( l1)
/(l1) is within the range of 1.3:l to 7:1.

In the coarse sheet of the present invention, the conductive coating layer may cover only the exposed surface of the threads in the base fabric, and may wrap the intersections of the threads and bind them together,
Alternatively, it may cover the entire surface of the threads constituting the base fabric.

Further, the coarse sheet of the present invention includes a flexible polymer material having insulation properties as a main component, and an insulating coating layer having a resistivity value larger than 10' Ωam is formed on the conductive coating layer. It may be something that is currently in use.

Furthermore, the 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 electrically conductive materials and semiconductive materials, and has a resistance in the range of 102 to 108 ΩCm. A semiconductive coating layer that is located within the conductive coating layer and has a specific resistance value higher than that of the electrically conductive coating layer may be formed on the electrically conductive coating layer.

The coarse woven base fabric used in the coarse sheet of the present invention is composed of yarns including at least warp yarns and weft yarns that are arranged in parallel with each other with gaps between the yarns. That is, the coarse 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 direction and the weft direction are perpendicular to each other. A leno weave in which the warp yarns 6 and the weft yarns 5 are tied together by a leno thread 7 is preferred.

The base fabric used in the present invention is coarse-grained, and the warp and weft may each form a gap of about 0.1 to about 1011II11 between parallel adjacent threads. Preferably, this inter-yarn gap is more preferably 0.1 to 5 mm.

That is, the area of the gap space formed between the warp and weft is preferably about 0.01 to 100 s'',
More preferably, it is 0.01 to 25+++m''.

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/
It is preferable to have a basis weight of 40 to 300 g/bo, more preferably 40 to 300 g/bo.

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.
Knitted fabrics 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, and monofilament yarn, which can effectively support the polymer material coating agent in as large a quantity as possible. Preferably.

When multifilament yarn is used as the yarn for the coarse base fabric, polyethylene terephthalate multifilament yarn of 100 to 5000 denier (melting point = approximately 260°C) and vinylon, multifilament yarn (thermal decomposition at approximately 220 to 230"C) are used. ) 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.

The exposed peripheral surfaces of the warp yarns 11 and the weft yarns 12 are conductive coated Jii
13, and the intersection of the warp 11 and the weft 12 is wrapped in a conductive coating layer and tied and fixed together, so it has excellent conductivity and prevents misalignment and thread omission. Ru.

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. 5, the warp 11 and the weft 12 are each covered with a conductive coating layer 13 on their entire surface, and at the intersection of the warp 11 and the weft 12, each of the warp 11 and weft 12 is covered with a conductive coating layer 13. conductive coating layer 1
Contact is made through 3.

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 a preferable example of the bottom 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 pyrolysis temperature of the base yarn.

The conductive material mixed in the matrix may be in the form of liquid, powder, fiber, foil, or wire, and -a may include carbon black, graphite, carbon fiber, metal, etc. .

Au, Ag, Pt, Cu, Cr,
Ni, Zn, Ti, Pb, Sn,
Pd.

and alloys containing at least one of these, compound powders, fibers, conductive compounds such as indium oxide powder, various conductive amorphous metals, and amorphous metal powders and fibers plated with conductive metals, etc. You can choose from.

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. It is determined by taking into consideration the following: - Generally, it is preferably 5% by weight or more, and 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 affect 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 dioxide) antifouling agents color pigments, antioxidants, UV absorbers, and other additives. It may also contain an agent. 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 10'Ω
cm, preferably 101 Ω or less, more preferably 10° Ω or less, 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'Ω0, 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 selected from the polymer materials forming the matrix of the conductive coating layer. be able to.

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 preferred.

The insulating coating layer has a resistance higher than the 101+Ω mark, preferably 10
It has a specific resistance value of 10Ω0 or more, more preferably 101xΩ mark 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 10 5 Ωcm or less, 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.

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

The conductive organic compound is, for example, a polycarboxylic acid ester compound of mono- and poly-alkylene glycol monoalkyl ether, and is represented by the following general formula (1).
), (II) and (■): Z (Coo(AsO
)lRs) nt (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, and Z represents an aliphatic, alicyclic and aromatic polycyclic group having 2 to 22 carbon atoms. represents a member selected from basic carboxylic acid residues; A, A, A, A4 and A each independently represent a member selected from alkylene groups having 2 to 4 carbon atoms; R0R2, R1R4 and R3; each independently represents a member selected from straight chain and branched chain alkyl groups having 1 to 15 carbon atoms, provided that A, and R□A 2+
The total number of carbon atoms N in RZ and A3 and R8 is 5
~17, m + + m z + m 3 and m4 each independently represent an integer from l to 7, and n
l represents an integer of 1 to 5, R2 is l, or 3 to 6
, l represents an integer of 1 to 7, and when R2 is 3 to 6, n2 C00(Ash) l and R3 in the Rs group may be different from each other or are the same. It may be. ) includes a group of compounds represented by

The hexanot and poly-alkylene glycol monoalkyl ethers used in the production of the above 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, propylene oxy 11
-3 mol or addition compound with 1-2 mol of butylene oxide: 11-5 mol of heptanol and ethylene oxide, 1-3 mol of propylene oxide or 1-2 mol of butylene oxide
Addition compound with mole: Addition compound between octanol and 1 to 4 moles of ethylene oxide, 1 to 3 moles of propylene oxide or 1 to 2 moles of butylene oxide, dinonanol and 1 to 4 moles of ethylene oxide, 1 to 2 moles of propylene oxide
mol or addition compound with 1 to 2 mol of butylene oxide:
Addition compounds of decanol with 1 to 3 moles of ethylene oxide, 1 to 2 moles of propylene oxide, or 1 mole of butylene oxide.Addition compounds of nidodecanol with 1 to 2 moles of ethylene oxide, 1 mole of propylene oxide, or 1 mole of butylene oxide.Nitridecanol and ethylene oxide. -2 mol, addition compound with 1 mol of propylene oxide or 1 mol of butylene oxide; addition compound with tetradecanol and 1 mol of ethylene oxide, 1 mol of propylene oxide; and addition compound with pentadecanol and 1 mol of ethylene oxide, etc. I can give an example.

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.

The carboxylic acids used in the production of the conductive ester compounds of formulas (II) and (I[I) above include monocarboxylic acids, trivalent or higher polyvalent carboxylic acids, or divalent carboxylic acids having an epoxycyclohexane ring. 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, butanetricarboxylic acid, butanetetracarboxylic acid, alicyclic carboxylic acids such as epoxyhexahydrophthalic acid, trimellitic acid,
Aromatic polycarboxylic acids such as pyromellitic acid, acid anhydrides of these carboxylic acids, and the like 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 10 SΩcm, more preferably 107 to 106 Ωcm. If the specific resistance value of the semiconductive coating layer is higher than 10', it will show electrical insulation and the antistatic effect will be insufficient, and if it is lower than 102 Ωcm, it will show electrical conductivity as a whole and the leakage prevention effect will be insufficient. It will be enough.

There are no particular limitations on the weight and thickness of the insulating coating layer and the semiconductive coating layer, as long as they match the intended 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 made of VB knit.

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 sheet of the present invention, the threads covered with the coating layer containing a flexible polymer material have a cross-sectional shape that is flat with respect to the plane of the sheet. In this flat cross-sectional shape, the cross-sectional length (l,) in the direction parallel to the sheet plane,
The ratio B, )/(zz) to the cross-sectional length (12) in the direction perpendicular to the sheet plane is within the range of 1.3:1 to 7:l. 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 applying a pressure flattening treatment to the covering sheet obtained by coating the coarse base fabric with a predetermined covering layer. In addition, in order to flatten the yarn without actively applying pressure and flattening treatment, yarn suitable for flattening, such as non-twisted yarn made of multifilament, lightly twisted yarn, or The number of twists is 12.
Multifilament yarn of 0 t/m or less, especially one with a twist number of 100 t/m or less, e.g. 50 to 100 t/m
It is preferable to use one. 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 as a fiber aggregate, that is, two or more yarns. A coarse base fabric may be produced using an uncoated yarn having a flat cross-sectional shape as described above, and 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.

Using two aligned yarns of 10 sets of polyester multifilament yarns as warps, a lewd weave with a texture as shown in FIG. 2 was prepared. The structure was as follows, and the average size of the inter-yarn gap was 3.5 w x 3.5 kaku (7 x 7 (strands/25.4 ao)) This coarse base fabric was made with the following composition: P V C100 parts by weight Copper powder 50〃 DOP (Plasticizer) 80〃 Stabilizer 1 # Antimony oxide (flame retardant) 30〃 Pigment (green) 2〃Trichlene
50〃 polymerized rod set TI! i. The composition was soaked in the snout treatment solution, squeezed, and dried to form a gel, so that the composition was sufficiently adhered to the coarse base fabric. As a result, a conductive coating layer was obtained in which 100% by weight of the conductive coating layer was attached to the base fabric.

The specific resistance value of this conductive coating layer is 10-2Ω mark,
The ratio (j!l)/(f in the cross section of the covered yarn is 2.0
:1.

The obtained coarse sheet not only exhibited good electromagnetic wave shielding properties, but also had good air permeability, transparency, and sound permeability, and was easily adaptable to the installation surface and easy to handle.

The same operations as in Example 1 were performed. However, on top of the conductive coating layer, an insulating coating composition of the following composition @! l: p v
c ioo weight part DOP
80 Stabilizer
l 〃 Antimony oxide 30〃 Green pigment 2 〃Trichlene
Form a coating layer of 50ッ and solidify it to give a coating layer of 1% to the weight of the base fabric.
A 5% insulating coating layer was formed.

The specific resistance value of the obtained insulating coating layer was 1014 Ωcm, and the ratio in the cross section of the coating yarn was (2+¥y/(ffi
z) was 2.4:1.

Furthermore, the obtained coarse sheet exhibited good electromagnetic shielding properties, and also exhibited good air permeability, transparency, and sound permeability, and was easily conformable to the installation surface and easy to handle.

Husband: The same operations as in Example 1 were performed. However, on top of the conductive coating layer, a semiconductive coating liquid having the following composition: p v c
ioo weight part DOP
80 Stabilizer 1
〃Antimony oxide 30〃Green pigment 2〃Carbon black 8〃Trichlene 50〃 A coating layer is formed, and this is solidified to give a coating layer of 15% based on the weight of the base fabric.
% semiconductive coating layer was formed. The specific resistance value of this semiconductive coating layer was 10'Ω, and the ratio (f+)/(j!t) in the cross section of the coating yarn was 2.5:1.

The resulting coarse-grained sheet has good electromagnetic shielding properties, satisfactory leakage prevention properties, and antistatic properties, as well as good ventilation, transparency, and sound permeability, and fits well on the installation surface. However, it was easy to handle.

The same operation as in Example 1 was carried out. However, as a coarse base fabric,
The following structure consisting of water-insolubilized polyvinyl alcohol fiber (vinylon) spun yarn was used: 5 S/1×5 S/1 7 pieces/2.54 C11×7 pieces/2.54 cm coarse plain fabric. 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-''Ω0.

This coated coarse-grained sheet was flattened by a pair of squeeze rolls in the process of applying the conductive coating layer. The ratio (1l)/(lz) in the cross section of the coated yarn was 4:1.

In addition, this coarse sheet has good electromagnetic shielding properties, ventilation and
It has ventilation, transparency, and sound permeability, fits well on the installation surface, is easy to handle, and has high durability.

Fumasu Ban Epolyester 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 10-2Ω.

Using this coated yarn, a plain woven fabric with a density of 7 x 7 threads/inch was created. (Inter-yarn gap: 3.5 mm x 3.5 m) This plain woven fabric is heated to about 140°C and lightly pressed through a pair of press rolls at room temperature to flatten the yarn and to flatten the yarn at the joining point. It was temporarily fixed by pressing.

The inter-yarn gap of the obtained coarse sheet is approximately 3.0 m x 3
．． 0, and the ratio (Il+)/ in the cross section of the covered thread is
Ctzz> is 3:1, and the yarn is well fixed.
The coarse sheet had good handling properties, conformability to the installation surface, and electromagnetic shielding properties.

On the plain woven fabric having the conductive coating layer obtained in Example 5, a border coating layer having the same composition as that described in Example 2 was formed at a coating amount of 10% (by weight). . The ratio (x+)/(12> in the cross section of the coated yarn was 2.8:1.The properties of the obtained coarse sheet, especially the conformability to the installation surface and the electromagnetic shielding property, were the same as in Example 2. It was good.

2 Arashi Myoo On the plain fabric having the conductive coating layer obtained in Example 5, a semiconductive coating layer having the same composition as that described in Example 3 was formed at a coating amount of 10% (by weight). The ratio (f+)/(f□) in the cross section of the coated yarn was 2.5:1. Further, the properties of the obtained coarse sheet, especially the electromagnetic shielding properties, were as good as in Example 3.

[Brief explanation of the drawing]

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 FIG. 4, FIG. 5, and FIG. FIG. 7 is a cross-sectional explanatory 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; FIG. It is an explanatory view showing an example. 1.4a, 4b, 6.11 - Warp, 2.3, 5.12... Weft, 7... Leno thread, 13... Conductive coating layer, 14... Insulating or semiconductive Covering layer. 1.4a, 4b, 6. Il... Warp 2.3, 5.12... Weft 7... Leno thread

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. A coarse sheet having a conductive coating layer containing as a main component a mixture of The yarn that covers at least the exposed surface and is covered by the conductive coating layer has a cross-sectional shape that is flat with respect to the sheet plane, and the direction of the covered yarn is parallel to the sheet plane. The ratio (l_1) of the cross-sectional length (l_1) at
1)/(l_2) is in the range of 1.3:1 to 7:1, a coarse sheet with excellent transparency, air permeability, sound permeability and electromagnetic shielding properties. 2. 2. The 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 coarse sheet according to claim 1, wherein the conductive coating layer covers the entire surface of the threads forming the base fabric. 4. The coarse mesh according to claim 1, wherein an insulating coating layer containing a flexible polymer material having insulating properties as a main component and having a resistivity value larger than 10^5 Ωcm is formed on the conductive coating layer. 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 10^5
The coarse mesh 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 electrically conductive coating layer. sheet.