JPS59209317A - Electric shock accident preventing 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 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.

(2) Alternatively, 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, 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 blanks or metal powders or fibers, into the backing material to make the entire rug conductive and antistatic. ing.

In recent buildings, electrical wiring is placed on the floor,
A method of covering this with a mat, for example the flat cable method, is being developed. At this time, if the rug, especially the back surface in contact with the floor, is conductive like a conventional antistatic rug, if there is a leakage of electricity from the electrical conductors wired on the floor, people on the rug may receive an electric shock. There is a risk of

An object of the present invention is to provide a rug whose upper surface layer is antistatic and which can prevent serious accidents even if there is current leakage from electrical wiring on the floor.

The electric shock prevention rug of the present invention is characterized by comprising a conductive surface layer having an upper surface layer made of a fiber material, and a backing layer formed on the back surface thereof and having an electrically insulating lower surface layer. be.

The upper surface layer of the rug of the present invention is formed of a fibrous material, which may be woven, knitted, or nonwoven. (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 may be natural fiber (wool, etc.), recycled fiber (rayon, cupro, etc.), semi-synthetic *JJI# (acetate fiber, etc.), or 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 material forming these (4) may be spun, yarn, multifilament yarn, monofilament yarn. , split yarn, tape yarn, etc.

The conductive surface layer of the rug of the present invention may consist only of the above-mentioned upper surface layer, or preferably may include an upper surface layer and a conductive intermediate layer formed on the back surface thereof. When the conductive surface layer consists of only the upper surface layer, the upper surface layer exhibits conductivity. In this case, when the upper 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 surface layer has an upper surface layer and a conductive intermediate layer, the upper surface layer may or may not be electrically conductive. When the upper surface layer exhibits 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.

(5) 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 surface layer of the rug of the present invention is 10I0Ωc as a whole.
It is preferable to have a resistivity of 109Ω or less, more preferably 109ΩG or less, and 10 to 10
Most preferably it has a resistivity of 9 cm. The conductive surface layer having the above characteristics can prevent charging due to friction.

In particular, when covering a room that houses electronics-related equipment such as a computer room, a conventional antistatic rug with a resistivity of about 105 to 10"Ω・G is insufficient. 103 Ω・cm or less, preferably 10' to 10
It is preferable to have a resistivity of 4Ω·■ or less.

In conventional antistatic rugs, if only the top pile layer is made conductive, the resistivity is at a limit of 105 to 109 Ω.In order to achieve the above resistivity, a conductive intermediate layer is required in the rug. The technical idea of specifically incorporating
6) This is something that was unnecessary in the normal use of conventional rugs, and is a novel item that meets the new requirements that have arisen due to the special use of rugs, such as the double rug.

The rug of the present invention has a backing layer having an electrically insulating lower surface layer. The electrically insulating lower surface layer preferably has a resistivity of 109 Ωcm or more, particularly 10 ΩG or more, and more preferably 100 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 surface soft 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 having a large number of pores, e.g. 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 may be covered with a polyvinyl chloride insulating sheet having a thickness of about 0.1-1, Ox1. When such a thin sheet is used as a covering layer, the compatibility between the carpet and the floor surface is not particularly deteriorated (7). 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, and holes are formed in the insulating backing layer, electrical wiring on the floor can pass directly or indirectly through the holes to the conductive surface layer. Electricity may leak and 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 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
It 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). However, each gap space between the rigid pieces should be as small as possible.

There are no particular limitations on the shape and dimensions of the rug of the present invention, but when it is selectively used on areas with electrical wiring on the floor, or in commercial rooms where the wiring is often rearranged, it is recommended to use a tile-like shape. and dimensions, e.g. 5ΩcmX5Qc
+n square shape is 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 has a conductive surface layer 2 and a backing N
(9) The surface N2 consists of a base fabric layer 4, a pile layer 5, and a conductive intermediate layer 6. The backing N3 may be made of a rigid synthetic resin material as shown.

In FIG. 2, the conductive surface layer 2 is made of a nonwoven fabric containing conductive fibers, and the backing layer 3 is made up of a protective layer 7 made of a rigid synthetic resin plate and a porous synthetic resin layer 8.

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: 8th grade I 750 g/g On the back side of the above nylon pile carpet, polyvinyl chloride resin containing about 20% by weight of carbon black was applied.
A fiber reinforced polyester resin plate (FRP) with a thickness of 1 to 1 liter is pasted on the back side as a protective layer, and a foamed polyester plate with a thickness of 211 mm is applied to the back side. A vinyl chloride layer was applied to form a backing layer.

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

Carbon black-containing polyvinyl resin layer: 10 9c
m FRP (protective) layer, +o+7Ωcm
Foamed polyvinyl chloride layer, 1017 Ω ■The human body voltage of the above rug was 1.8 (-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 voltage of this comparison rug is 21.2 (-
KV), clear electrostatic charging was observed.

A large pair of scissors weighing about 500 g was placed on the rug of this example.
I dropped it from a height of 1.5m with the blade tip facing downward, but
No through-holes were observed in the rug, and no risk of short-circuiting the conductive surface layer to the floor surface was observed.

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

However, instead of nylon pile carpet, the bottom (11
) A conductive carpet was used.

Base fabric: Polyester fiber non-woven fabric containing 5% (weight) of carbon fiber Bile: Antistatic nylon fiber, length: 8th item Dimension: 750 g/d Resistivity: ], 8XIOΩ・cm Instead of the carbon black-containing polyvinyl chloride resin layer, a polyvinyl chloride resin intermediate layer containing 45% by weight of carbon black (kechinburasoku) and having a thickness of 21 is formed as a layer, and the thickness formed on the lower surface of the polyvinyl chloride resin intermediate layer is 21% by weight. A polyvinyl chloride resin backing layer was formed. Its resistivity was 2.5 XIOΩ·cm. The above sheet was cut into a size of 50G x 50cm to make a tile carpet.

The human body voltage on the above tile carpet is 0.5 (-KV
)Met. Moreover, since the intermediate layer of this tile carpet was filled with a large amount of carbon blank, the obtained tile carpet had preferable hardness. Furthermore, the PVC resin backing layer was able to overcome the shortcomings such as brittleness and low flexibility caused by the large amount of carbon blank contained in the intermediate layer (12), 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 above-mentioned 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. ■...rug, 2...surface layer, 3...backing layer, 4...
... Base fabric, 5... Pile layer, 6... Conductive intermediate layer,
7... Protective layer, 8... Insulating lower surface layer. (13) Figure 1

Claims (1)

[Scope of Claims] (1) A rug to prevent electric shock accidents, which comprises an electrically conductive surface layer having an upper surface layer made of a fiber material, and a backing layer formed on the back surface thereof and having an electrically insulating lower surface layer. 2. The rug according to claim 1, wherein the conductive surface layer comprises the fibrous upper surface layer and a conductive intermediate layer formed on the back surface thereof. 3. The rug according to claim 1 or 2, wherein the upper surface layer has a fiber base fabric and a pile layer formed on the upper surface thereof. 4. The rug according to claim 3, wherein at least one of the pile layer and the base fabric is conductive. 5. Claim 4, wherein at least one of the conductive pile layer and the base fabric contains conductive fibers.
Rugs mentioned in section. (1) 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.