JPH0158293B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for constructing conductive connections for antistatic tile carpets. The present invention relates to a method for constructing antistatic tile carpets while making conductive connections.

[Conventional technology]

Conventionally, plastic tiles, so-called vinyl tiles, have been used as flooring materials for offices and homes. In addition to problems such as being hard, cold, uncomfortable to step on, and tiring, the vinyl tiles were not aesthetically pleasing. For this reason, long carpets having an upper surface layer made of fibrous material have come to be used instead of vinyl tiles. However, such long carpets are troublesome to transport, bring in, and install, and when local stains occur, they cannot be replaced locally, and local repairs can seriously impair the aesthetics. There is a problem with this.

In recent years, carpet tiles of various shapes, such as squares, rectangles, and rhombuses, have come into use as bedding materials to solve the above-mentioned problems. Such carpet tiles have the advantages of being easy to transport, carry in, and install, allowing for local replacement, and being able to form desired patterns by combining carpet tiles of various colors. are doing.

However, many of these tile carpets also have the disadvantage of generating static electricity, similar to ordinary carpets. For example, in the case of a tile carpet consisting of an upper surface layer made of fiber material and a backing layer formed on the back side, if the fiber material forming the upper surface layer of fibers is made of a hydrophobic synthetic polymer, this The upper surface layer is easily charged with static electricity due to friction or the like. In order to prevent such charging, it is known to mix conductive fibers such as carbon fibers or metal fibers in the upper surface layer. It is also known to coat the back side of the upper surface layer of fibers with a conductive paint containing a conductive substance, such as carbon black, or metal powder or fibers, to prevent the upper surface layer from being charged. Rug backings are generally synthetic or based on natural rubber and are insulative in nature and therefore tend to promote charging of the upper surface layer. In order to prevent such drawbacks of backing materials, it is also known to mix conductive substances such as carbon black or metal powder or fibers into the backing material to make the entire rug conductive and antistatic. ing.

When arranging a plurality of conductive tile carpet units as described above on a floor surface, the joints of adjacent tile carpet units are not necessarily connected in a conductive manner, and each tile carpet unit voids often occur between the conductive layers. By forming such voids, each tile carpet unit becomes
They may be insulated from each other or have insufficient electrical conductivity, resulting in an overall unsatisfactory antistatic effect.

In addition, the backing layer provided on the back side of the upper surface layer of the fiber is coated with a layer of an adhesive material such as bituminous or atactic polypropylene, which easily undergoes permanent deformation due to thermoplasticity at room temperature. When installing such a tile carpet, the back layer must be peeled off from the adhesive material layer and the adhesive material layer must be attached to the floor surface, or the back layer must be attached to the floor surface. This layer is bonded to the floor surface with an adhesive or the like without peeling off the layers. The tile carpet as described above has the advantage that the adhesive material layer is easily deformable at room temperature, so that it can be deformed along the floor surface and fitted onto the floor surface. However, the fluidity of bitumen and atactic polypropylene increases as temperature and pressure increase. Therefore,
In hot seasons or places, or in places where it is stepped on by many people, conventional tile carpets suffer from problems such as the backing layer flowing and deforming, losing its practicality and spoiling its aesthetics. is occurring.
However, if the backing layer that is easily deformed due to flow is made conductive, adjacent tile carpet units will be electrically connected by the conductive backing layer that expands due to the flow change. It becomes like this. However, such a conductive connection effect cannot always be expected, and there are cases where the tile carpet is not exposed to tread pressure immediately after installation, or when there is little opportunity to receive tread pressure.
When the temperature at the place of use is low, the flow deformation of the conductive backing layer as described above does not occur.

Therefore, when installing carpet tile units on a floor surface, proactive measures are required to conductively connect their conductive layers to each other.

Furthermore, in recent buildings, construction methods have been developed in which electrical wiring is placed on the floor and covered with a mat, such as the flat cable method. At this time, if the rug, especially the back side that is in contact with the floor, is conductive like a conventional antistatic rug, there will be a leakage of electricity from the electrical conductors wired on the floor.
Risk of electric shock to personnel on the rug. For this reason, electric shock prevention rugs have also been developed that have an electrically conductive surface layer that has an upper surface layer made of a fiber material, and a backing layer that is formed on the back side and has electrical insulation properties. In this type of tile carpet, it has been difficult to sufficiently electrically connect the conductive layers of each unit.

[Problem that the invention seeks to solve]

The object of the present invention is to provide the following steps when placing a plurality of tile carpet units having a conductive layer on a floor surface:
It is an object of the present invention to provide a method for conducting conductive connection of an antistatic tile carpet, which allows these conductive layers to be conductively connected to each other.

[Means and effects for solving problems]

The conductive connection construction method for an antistatic tile carpet of the present invention which achieves the above object has a method for installing a conductive connection between adjacent tile carpet units when arranging a plurality of tile carpet units each having a conductive layer on a floor surface. The conductive layer is electrically connected by a conductive adhesive layer.

The tile carpet unit used in the method of the present invention has a conductive layer, preferably one or more conductive layers having a resistance of 10 ⁶ Ω-cm or less, and there are no particular limitations on its composition or shape. .

For example, some tile carpet units used in the method of the present invention have a fibrous surface layer and a backing layer as described below. The upper surface layer of this tile carpet unit is formed of a fibrous material, which may be woven, knitted or non-woven, one of which serves as the base fabric, and on the upper surface of , pile layer (which may be cut pile, loop pile, or a mixture thereof),
Alternatively, a fiber entangled layer may be formed. The fiber material forming the upper surface layer may be natural fibers (wool, etc.), recycled fibers (rayon, Kyupra, etc.), semi-synthetic fibers (acetate fibers, etc.), or synthetic fibers (nylon, polyester, polyacrylic, or polypropylene fibers). ), or a mixture of two or more of these. Also,
The upper surface layer may have a base fabric and a pile layer as described above, but the fiber materials forming these may be spun, yarn, multifilament yarn, monofilament yarn, split yarn, tape yarn. It may be any of the following.

In a tile carpet unit of the type described above, the fibrous top layer may be electrically conductive, in which case the backing layer may be electrically conductive, or
It does not have to be conductive. Generally, it is preferred that both the fiber surface layer and the backing layer are electrically conductive.
In the method of the invention it is preferred to use tile carpet units having a conductive layer in the backing layer.

The fibrous surface layer of such a tile carpet unit may consist only of a conductive fiber layer, but preferably has a fiber layer and a conductive intermediate layer formed on the back surface thereof. When the fiber surface layer consists of a base fabric and a pile layer, it is necessary that either or both of the base fabric and the pile layer exhibit electrical conductivity. When the conductive upper surface layer has a fibrous layer and a conductive intermediate layer, the fibrous layer may or may not be electrically conductive. When the fiber layer exhibits conductivity, at least a portion of the fiber material forming the fiber layer needs to contain conductive fibers.
The conductive fiber is carbon fiber, metal fiber, or
It may be any fiber containing or having a coating layer containing a conductive substance and/or a hygroscopic substance.

The conductive intermediate layer may be a synthetic resin layer mixed with a conductive substance (powder or fiber), or may have conductive wires embedded therein.

Preferably, the conductive layer of the tile carpet unit used in the method of the invention has an overall resistivity of less than 10 ¹⁰ Ω-cm, more preferably less than 10 ⁹ Ω-cm. The conductive upper surface layer having the above characteristics can prevent charging due to friction.

The backing layer of the carpet tile unit may have an electrically insulating lower surface layer. The electrically insulating lower surface layer preferably has a resistivity of 10 ¹⁰ Ω-cm or more, more preferably 10 ¹² Ω-cm or more. This lower surface layer is made of electrically insulating synthetic resin, rubber, or the like. In order to make the contact between the rug and the floor soft, and to prevent irregular changes in the amount of current due to tread pressure,
It is preferable that the lower surface layer is made of a porous elastic material having a large number of pores, such as a foamed polyurethane layer or a foamed polyvinyl chloride layer.

Porous layers can sometimes absorb moisture, reducing the electrical insulation properties of the underlying surface layer. To solve this problem, the surface of the porous layer may be covered with an insulating sheet, such as a polyvinyl chloride insulating sheet, having a thickness of about 0.1 to 1.0 mm. When such a thin sheet is used as a covering layer, the conformability between the carpet and the floor surface is not particularly deteriorated. Of course, a layer of porous elastic material on the lower surface may not be used.

If a tile carpet is damaged during use, such as by a falling metal object, and a hole is formed in the insulating backing layer, electrical current can leak directly or indirectly from the electrical wiring on the floor through the hole to the conductive layer. This may cause electric shock to the human body. To prevent such accidents,
A protective layer made of a rigid material such as a metal plate, synthetic resin plate, FRP plate, etc. may be formed on the backing layer. When these protective layers themselves have electrical insulation properties, the protective layers may also serve as an insulating lower surface layer. Further, when the protective layer is made of a metal plate, this protective layer may also serve as a conductive intermediate layer in the surface layer. Furthermore, it is preferred that the protective layer is placed so that it is not directly adjacent to the top surface layer and does not come into direct contact with the floor surface.

The protective layer may be in the form of a flat plate, but it may be in a shape that can be rolled up, such as a sag, a net, a sieve, a perforated plate (nest plate), or a thin plate (membrane). However, it is preferable that each gap space between the rigid body pieces be as small as possible.

There is no particular limitation on the shape and dimensions of the tile carpet unit used in the present invention, but when it is selectively used on a part of the floor where there is electrical wiring, for example,
It is convenient to use if it is a square of cm x 50 cm.

In the tile carpet unit used in the present invention, an intermediate base fabric layer may be disposed between the fiber top layer and the backing layer, or a back base fabric layer may be disposed on the backing layer. These base layers are
Effective for preventing warping of carpet tiles.

In the method of the present invention, when arranging a plurality of tile carpet units having at least one conductive layer on a floor surface, the conductive layers of adjacent tile carpet units are bonded using a conductive adhesive. Make a conductive connection.

Preferably, the conductive adhesive layer formed between the tile carpet units has a resistivity of less than 10 ⁸ Ω-cm.

The conductive adhesive used in the present invention is a rubber adhesive (for example, the main component is natural rubber and/or synthetic rubber, and a tackifier such as rosin, rosin ester, or synthetic hydrocarbon resin) ), acrylic adhesive (e.g. 2
- ethylhexyl acrylate or butyl acrylate and vinyl acetate, methyl acrylate,
copolymers consisting of methyl methacrylate and acrylic acid, etc.), silicone adhesives, or
Other known adhesives, preferably 10 to 90% (by weight) of conductive substances, such as powders or fibers of gold, silver, copper, nickel, carbon black, graphite, plated silver, etc. It is formed from a mixed mixture.

The conductive adhesive of the present invention can be used, for example, as an adhesive based on polyvinyl chloride, polypropylene, polyethylene, polyester, cellulose, acetate, polyimide, polytetrafluoroethylene, polyurethane, synthetic rubber, natural rubber, or other polymers. , preferably 10 to 90% (by weight) of the powder or fiber of the conductive substance as described above.

In the present invention, an adhesive containing a powder of the conductive material as described above is applied to the adjacent side surface of each tile carpet unit, and is dried and solidified to adhere the tile carpet units.

The carpet tiles constructed in this manner can be easily replaced in parts, which is the original purpose of the carpet, and have perfect antistatic properties.

〔Example〕

A nylon pile carpet having the following configuration was used for forming the surface layer.

Base fabric: polyester fiber non-woven fabric Pile: nylon fiber, length: 8mm, basis weight: 750
g/m Approx.
A conductive intermediate layer is formed by coating polyvinyl chloride resin containing 20% carbon black to a thickness of 1 mm, and a 1 mm thick fiber-reinforced polyester resin plate (FRP) is attached to the back side as a protective layer. Then, a foamed polyvinyl chloride layer with a thickness of 2 mm was adhered to the back surface to form a backing layer.

This rug was cut into squares of 50 cm x 50 cm to create a number of tile carpet units.

Arrange this tile carpet unit on the floor,
20% on opposite sides of the conductive interlayer of each adjacent unit
An adhesive consisting of butyl acrylate, methyl methacrylate, and acrylic acid containing (weight) of graphite was applied to bond both units together. The human body charge voltage on each unit on the resulting carpet was 1.8 (-KV) or less, and no electrostatic charge was felt.

For comparison purposes, if no conductive connection material is used,
The human body voltage on each tile carpet unit is 1.8 ~
The voltage varied in the range of 16.4 (-KV), and a tile carpet with partial electrostatic charge was observed.

Claims (1)

[Claims] 1. When placing a plurality of antistatic tile carpet units each having a conductive layer on a floor surface, the conductive layers of adjacent tile carpet units are separated by a conductive adhesive layer. A conductive connection construction method for antistatic tile carpet characterized by conductive connection. 2. The method of claim 1, wherein the conductive adhesive layer has an electrical resistivity of 10 ⁸ Ω-cm or less. 3. The method of claim 1, wherein the conductive layer of the antistatic tile carpet unit has an electrical resistivity of less than 10 ⁸ Ω-cm.