JPS6033665B2 - Electric shock prevention rug - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antistatic rug, and more specifically, to an antistatic rug that can prevent electrical leakage from the floor surface.

Conventionally, rugs having an upper surface layer made of a fibrous material have had a backing layer formed on the back side of, for example, a pile upper surface layer made of the above-mentioned fibrous material.

When the fiber material forming the upper surface layer is made of a hydrophobic synthetic polymer, this 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. Alternatively, a conductive substance such as carbon black or
It is also known to prevent the upper surface layer from being charged by coating it with a conductive paint containing metal powder or fibers. 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 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. 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, rugs, especially
The back side that touches the floor is like a conventional antistatic rug,
If it is conductive, there is a risk of electric shock to people on the rug if there is a leakage from electrical conductors running on the floor. An object of the present invention is to provide a rug whose upper surface layer is antistatic, and which can prevent electric shock accidents even if there is current leakage from electrical wiring on the floor.

The electrical shock prevention rug of the present invention has an electrically conductive surface layer having an upper surface layer made of a fiber material and an electrically conductive intermediate layer formed on the back surface of the upper surface layer and made of a movable synthetic resin or rubber material as a base material. and a backing layer formed on the back surface thereof and having a lower surface layer made of electrically insulating synthetic resin or rubber material.

The upper surface layer of the rug of the present invention is formed of a fibrous material, which may be a woven fabric, a knitted fabric, or a non-woven fabric. One of these base fabrics is used as a base fabric, and a pile layer ( It may be cut pile, loop pile, or a mixture thereof), or it may be formed with an entangled fiber layer.

The fiber material forming the upper surface layer is natural fiber (wool, etc.)
, recycled fibers (rayon, cupro, etc.), semi-synthetic fibers (
acetate fiber, etc.), synthetic fiber (nylon, polyester, polyacrylic, or polypropylene fiber, etc.), or a mixture of two or more of these. 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, or split yarn. , tape yarn, etc. The rug of the present invention has an upper surface layer and an electrically conductive intermediate layer formed on the back surface thereof, both of which form an electrically conductive surface layer.

The upper surface layer may be conductive or non-conductive. The upper surface layer exhibits conductivity,
In the case of a base fabric and a pile layer, either the base fabric or the pile layer must both exhibit conductivity.
When the upper surface layer exhibits electrical conductivity, at least a portion of the fibrous material forming the upper surface layer needs to contain 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 is made of visible synthetic resin, such as polyvinyl chloride resin,
The base material may be polyurethane resin or rubber material, and a conductive substance (powder or fiber), such as carbon black or metal powder, may be mixed therein, or conductive wire may be embedded. It may be something that has been done.

The conductive surface layer of the rug of the present invention preferably has a resistivity of 1 pioQ skin or less as a whole, more preferably has a resistivity of 1 pioQ or less, Most preferably, it has resistivity. The conductive surface layer having the above characteristics can prevent charging due to friction. In particular, when carpeting a room that houses electronics-related equipment such as a computer room, the resistivity of the conventional antistatic rug is not 1 to 1 pi○, which is appropriate for the skin, and is therefore insufficient. It is preferable that a conductive intermediate layer is disposed therein to provide a resistivity of 1 p.o. or less, preferably 1 p.c. to 1 p.o./skin or less.

In conventional antistatic rugs, if only the top pile layer is made conductive, the limit is a resistivity of 1 p to 1 p. The technical idea of specifically incorporating a gendered intermediate layer, which was unnecessary in the normal use of conventional rugs, is novel in response to the new requirements created by the above-mentioned special uses of rugs. The rug of the present invention has a hair covering layer having an electrically insulating lower surface layer. The electrically insulating lower surface layer preferably has a resistivity of 1 to 20 skins or more, particularly preferably 1 to 20 skins or more. This lower surface layer is formed of electrically insulating synthetic resin, rubber material, 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, for example. Preferably, it is made of a foamed polyurethane layer or a foamed polyvinyl chloride layer. This porous layer sometimes absorbs moisture and reduces the electrical insulation properties of the underlying surface layer. To solve this problem, the surface of the porous layer should be 0.1 to 1. It may be covered with a polyvinyl chloride insulating sheet having a thickness comparable to that of material walls. 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 the rug is damaged during use, such as by falling metal objects, etc., and holes are formed in the insulating layer,
Electricity may leak directly or indirectly from the electrical wiring on the floor through this hole to the conductive surface layer, resulting in 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 insulation properties, the protective layers may also serve as an insulating lower surface layer. In addition, if 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 also 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). Although it is possible, it is preferable that each gap space in the Okayama body piece be as small as possible.

Although there are no particular limitations on the shape and dimensions of the rug of the present invention, when it is used selectively on areas with electrical wiring on the floor, or in commercial rooms where the wiring is currently being redecorated, tile-like rugs may be used. The shape and dimensions, for example a square of 50 arcs by 50 arcs, are convenient for use.

Particularly when a rigid protective layer is included, a tile-like shape is preferred. In this case, when constructing the carpet tiles on the floor surface, an insulating material (sheet) may be laid on the lower surface of the joint between the tiles just in case. In addition, in order to prevent conductivity from being interrupted between tiles, the conductive intermediate layers of adjacent tiles are connected using a conductive connecting material such as a pin or a conductive bonding material. It is preferable to carry out construction while The rug of the present invention will be further explained using the accompanying drawings.

In FIG. 1, a rug 1 consists of a conductive surface layer 2 and a backing layer 3, and the surface layer 2 consists of a base fabric layer 4, a pile layer 5, and a conductive intermediate layer 6. It is.

The hair layer 3 may be made of a rigid synthetic resin material as shown. In FIG. 2, the conductive surface layer 2 consists of a nonwoven fabric 9 containing conductive fibers and a conductive intermediate layer 6,
The backing layer 3 is composed of a protective layer 7 made of a rigid synthetic resin plate and an insulating cover layer 8 made of a porous synthetic resin layer.

The present invention will be further explained by examples.

Example 1 A nylon pile carpet having the following configuration was used for forming a surface layer.

Base fabric: polyester fiber non-woven fabric Pile: nylon fiber, length: 8 skin weight: 750 mm / Finish: On the back side of the above nylon pile carpet, polyvinyl chloride resin containing about 2% by weight of carbon black is applied.
A conductive intermediate layer is formed by covering a layer with a thickness of 1 layer, and a fiber-reinforced polyester resin plate (FRP) with a thickness of 1 layer is pasted on the back side of the layer as a protective layer. A foamed polyvinyl chloride layer was attached to form an insulating layer.

In the above rug, the electrical resistance values of each layer were as follows.

Carbon black-containing polypinyl resin layer: 1 B○ arc F
RP (protective) layer: 1 and 70 foam polyvinyl chloride layer: 1 and 70 cucumber The human body charge voltage of the above rug was 1.8 (1 KV), and no electrostatic charge was felt.

For comparison, a rug was prepared that did not include the carbon black-containing polyvinyl chloride coating layer. The human body charge voltage of this comparative rug was 21.2 (1 KV), and clear electrostatic charge was observed. A large iron weighing approximately 500 mm was dropped from a height of 1.5 m with the cutting edge facing downward onto the rug of this example, but no through holes were observed in the rug, indicating that it was conductive. No risk of short-circuiting of the surface layer to the floor surface was observed.

Example 2 An antistatic rug was produced in the same manner as in Example 1.

However, the following conductive carpet was used instead of the nylon pile carpet. Base fabric: Polyester fiber non-woven fabric containing 5% (weight) of carbon fiber Paly:
Antistatic nylon fiber, length; 8th side fabric weight: 750/
Resistivity: 1.8 x 1 and 80.Also, instead of the above-mentioned power-pump rack-containing polyvinyl chloride resin layer as an intermediate layer, a 2-layer thick film containing 45% by weight of carbon black (Ketin Black) was used as an intermediate layer. A polyvinyl chloride resin intermediate layer was formed, and a polyvinyl chloride resin backing layer having a thickness of one leg was formed on the lower surface of the intermediate layer.

Its resistivity was 2.5×1 pi○ skin. The above sheet was cut into a size of 50 cm x 50 cm to make a tile carpet. The human body voltage of the tile carpet was 0.5 (1 KV). In addition, the middle layer of this tile carpet is filled with a large amount of carbon black, so
The resulting carpet tile had favorable hardness. Furthermore, the polyvinyl chloride resin backing layer was able to cover the defects such as brittleness and low flexibility due to the large amount of carbon black contained in the intermediate layer, and was also able to maintain the insulation properties of the tile carpet. Furthermore, the appearance was improved by attaching a nonwoven fabric to the backing layer.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view showing the structure of one embodiment of the rug of the present invention, and FIG. 2 is an explanatory cross-sectional view showing the structure of another embodiment of the rug of the present invention. 1... Rug, 2... Surface layer, 3...
...Backing layer, 4...Base fabric, 5...Pile layer,
6... Conductive intermediate layer, 7... Protective layer, 8...
...Insulating backing layer. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A conductive surface layer having an upper surface layer made of a fiber material and a conductive intermediate layer formed on the back surface of the upper surface layer and having a flexible synthetic resin or rubber material as a base material. and a backing layer formed on the back surface thereof and having a lower surface layer made of electrically insulating synthetic resin or rubber material. 2. The rug according to claim 1, wherein in the conductive intermediate layer, a conductive substance is mixed or embedded in the flexible synthetic resin base material. 3. Claim 1 or 2, wherein the upper surface layer has a fiber base fabric and a pile layer formed on the upper surface thereof.
Rugs mentioned in section. 4. The rug according to claim 3, wherein at least one of the pile layer and the base fabric is conductive. 5. The rug according to claim 4, wherein at least one of the electrically conductive pile layer and the base fabric contains electrically conductive fibers. 6. The rug according to claim 1, wherein the insulating lower surface layer is made of a poroelastic material having a large number of pores. 7. The rug according to claim 1, wherein the backing layer has a protective layer made of a rigid material. 8. The rug according to claim 1, wherein the rug has a tile-like shape and dimensions.