JPS63171953A - Method for executing conductive connection of antistatic tile carpet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a method for electrically connecting antistatic tile carpets, and more specifically, to electrically connecting a plurality of tile carpet units each having a conductive layer. The present invention relates to a method for constructing antistatic tile carpets.

[Conventional technology]

Conventionally, plastic material tiles called so-called vinyl tiles have been used as flooring materials for offices and residences. In addition to problems such as being hard, cold, uncomfortable to step on, and tiring, the vinyl tiles also lacked aesthetic appeal. 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, transport, install, and install, and when local stains occur, it is impossible to locally replace them, and local repairs can seriously damage the aesthetics. There are problems such as.

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. This type of carpet tile is easy to transport, carry in, and install.
It has the advantage that it can be locally replaced and that a desired pattern can be formed by combining carpet tiles of various colors.

However, many of these tile carpets also have the drawback 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 thereof, if the fiber material forming the upper surface layer of fibers is made of a hydrophobic synthetic polymer, The 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 a carbon blank, or metal powder or fibers, to prevent the upper surface layer from being charged.

Rug backings, typically synthetic or based on natural rubber, are insulative in nature and therefore tend to promote charging of the top 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.
Air gaps are often created between the conductive layers of each carpet tile unit. When such voids are formed, each tile carpet unit becomes insulated from each other or has insufficient electrical conductivity.
Therefore, the antistatic effect is unsatisfactory as a whole.

In addition, the backing layer provided on the back side of the upper surface layer of the fiber is a layer of an adhesive material such as bitumen or acidic polypropylene, which tends to undergo permanent deformation due to thermoplasticity at room temperature, and a layer of adhesive material attached to the back side. 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, or the back layer must be peeled off from the adhesive material layer. This layer is bonded to the floor surface with an adhesive or the like without peeling off the layers. The above-mentioned carpet tiles have the advantage that since the adhesive material layer is easily deformed at room temperature, it can be deformed along the floor surface to fit the floor surface. However, the fluidity of bitumen and active polypropylene increases with increasing temperature and pressure.

Therefore, in hot seasons or places, or in places where it is stepped on by many people, the backing layer of conventional tile carpets may flow and deform, causing loss of practicality and deterioration of aesthetics. It's causing problems.

However, if the backing layer, which is prone to flow and deformation as described above, is made conductive, adjacent tile carpet units will be electrically connected by the conductive backing layer that flows and expands. become. However, such a conductive connection effect is not always effective when the temperature of the place of use is low.
Flow deformation of the conductive backing layer as described above does not occur.

Therefore, when applying carpet tile units to a floor surface, active measures are required to conductively connect the 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 (particularly the back surface that touches the floor) is conductive (as with conventional antistatic rugs), if there is a leakage from the electrical conductors wired on the floor, it may cause damage to the people on the rug. There is a risk of electric shock. 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 carpet tile, it has been difficult to sufficiently electrically connect the conductive layers of each unit.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a method for conductively connecting a plurality of tile carpet units having conductive layers, in which the conductive layers can be conductively connected to each other when the plurality of tile carpet units each having a conductive layer are arranged on a floor surface. It is about providing.

[Means for Solving the Problems and Effects] The conductive connection construction method for antistatic tile carpet of the present invention which achieves the above object is a method for installing a conductive connection of an antistatic tile carpet when arranging a plurality of tile carpet units each having a conductive layer on a floor surface. , the conductive layers of adjacent tile carpet units are electrically connected by a conductive adhesive layer.

The tile carpet unit used in the method of the present invention has one or more conductive layers, preferably one or more conductive layers having a resistance of 10 IlΩ-c+a or less, and there are no particular limitations on its structure or shape.

For example, some tile carpet units used in the method of the present invention have a fiber 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 a woven fabric, a knitted fabric, or a non-woven fabric. (Power 7 piles,
(may be loop pile or a mixture of these)
, or a fiber entangled layer may be formed. The fiber material forming the upper surface layer may be natural fibers (wool, etc.), recycled fibers (rayon, cupro, etc.), semi-synthetic fibers (acetate fibers, etc.), or synthetic fibers (nylon, cupra, etc.).
(polyester, polyacrylic, polypropylene fibers, etc.), or a mixture of two or more thereof. Further, 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, It may be any tape yarn or the like.

In the above type of carpet tiles,
The fiber top layer may be electrically conductive, in which case the backing layer may or may not be electrically conductive. Generally, it is preferable that both the upper fiber surface layer and the upper 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 surface layer on the fiber consists of a base fabric and a pile layer,
Either or both of the base fabric and the pile layer must exhibit electrical conductivity. When the conductive upper surface layer has a fibrous layer and a conductive intermediate layer, the fibrous layer may be electrically conductive, and portions thereof need to contain electrically conductive fibers. The conductive fibers may be carbon fibers, metal fibers, or fibers 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.

The conductive layer of the tile carpet unit used in the method of the present invention preferably has a resistivity of IQIOΩ-1 or less as a whole, and more preferably has a resistivity of 10'Ω-1 or less. 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 has a resistance of 1010Ω-
It is preferable to have a resistivity of B or more, and it is more preferable that this resistivity is 10 Ω-1 or more. This lower surface layer is made of electrically insulating synthetic resin, rubber, or the like. In order to soften the contact between the rug and the floor surface, and to prevent the amount of current from changing irregularly due to tread pressure, the lower surface layer is made of a porous elastic material with a large number of pores, such as polyurethane foam. It is preferable to consist of a polyvinyl chloride 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 nm. When such a thin sheet is used as a covering layer, the compatibility 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 falling metal objects, etc., and a hole is formed in the insulating backing layer, current may leak directly or indirectly from the electrical wiring on the floor through the hole to the conductive layer. , may cause electric shock to the human body. In order 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 insulating properties, the protective layers may also serve as the 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 (film). However, each gap space between the rigid pieces should 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 if it is selectively used in a part of the floor where there is electrical wiring, a square of 5Qcm x 5Qcn+, for example, may be used. It's convenient.

In the tile carpet unit used in the present invention, an intermediate base fabric layer may be disposed between the fiber surface layer and the backing layer, or a back base fabric layer may be disposed on the backing layer. When arranging a plurality of tile carpet units on a floor surface in order to prevent warping of the tile carpet units, these base fabric layers are used to bond the conductive layers of adjacent tile carpet units with conductive adhesive. Make a conductive connection using an agent.

Preferably, the t-L conductive adhesive layer formed between the tile carpet units has a resistivity of less than or equal to 10 8 Ω-value. One of the conductive adhesives used in the present invention is a rubber adhesive (e.g., containing natural rubber and/or synthetic rubber as a main component,
rosin, rosin ester, or synthetic hydrocarbon resin as a tackifier), acrylic adhesive (for example, 2-ethylhexyl acrylate or butyl acrylate, vinyl acetate, methyl acrylate, methyl copolymers consisting of methacrylate and acrylic acid, etc.), silicone adhesives, or their powders such as bomb black, graphite, plated silver, etc.
It is formed from a mixture of fibers.

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% (baking soda) may be mixed with powder or fiber of the conductive substance as described above.

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

The tile carpet constructed in this manner can be easily replaced in parts, which is its original purpose, and has 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 H3mm Dimensions: 750g/m On the back side of the above nylon pile carpet, polyvinyl chloride resin containing about 20% by weight of carbon black,
A conductive intermediate layer is formed by coating to a thickness of I n+, and a fiber-reinforced polyester resin plate (FRP) with a thickness of 1 m is coated on the back side.
) was adhered as a protective layer, and a foamed polyvinyl chloride layer having a thickness of 2B was adhered to the back surface thereof 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.

The tile carpet units are arranged on the floor and an adhesive consisting of butyl acrylate, methyl methacrylate, and acrylic acid containing 20% (by weight) graphite is applied to the opposite sides of the conductive intermediate layer of each adjacent unit. do,
Glued 100 units.

The human body charge voltage on each unit on the obtained carpet was 1.8 (-KV) or less, and no electrostatic charge was felt.

For comparison, when no conductive connection member is used, the human body electrostatic voltage on each tile carpet unit is 1.8 to 16.4 (
- KV), and some tile carpets were observed to have electrostatic charge.

Claims (1)

[Claims] 1. When arranging 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 according to claim 1, wherein the conductive adhesive layer has an electrical resistance of 10^8 Ω-cm or less. 3. The conductive layer of the antistatic tile carpet unit is 1
2. The method of claim 1, having an electrical resistivity of 0^8 ohm-cm or less.