JPH04121237A - Antistatic mat - Google Patents

Abstract

PURPOSE:To remove static electricity of human body at an instant by partially connecting a discharge paper sheet to the rear surface of a ground fabric, by striking a pile including a conductive fiber in such a way that the ground fabric is penetrated thereby, and by arranging a conductive fabric in such a way that it comes into contact with the conductive fiber of the pile. CONSTITUTION:Plural piles 14 are struck into a discharge paper sheet 15 arranged on the rear side of a ground fabric 12 of a sheet material. The pile 14 is composed of polyamide fiber and so on, which is an electrically non-conductive material, while the entire surface of an antistatic mat 11 is covered with the pile 14, and is thus in a condition that can be easily charged. Since a conductive fiber 18 is included in the pile 14, when a human body comes into contact with the surface side of the mat 11, the static electricity charged on the human body is easily grounded to the mat 11. The discharge paper sheet 15 and the ground fabric 12 are partially connected together with a bonding agent 19, so as to form a gap 30. A conductive fabric 50 including conductive fiber, is arranged on the rear side of the discharge paper sheet 15 in such a way that the fabric is in contact with the fiber 18. The static electricity charged on a human body is grounded to the pile 14 of the mat 11, and is lead to the fabric 50 by the fabric 18, and is thus retained. Atmospheric discharge is carried out from the discharged paper sheet 15 thereupon through the gap 30.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an antistatic mat. More specifically, it instantly removes static electricity from the human body inside a car.
To provide an antistatic mat that can eliminate discomfort caused by discharge phenomena when getting on and off, etc.

(Prior Art) Conventionally, as this type of antistatic mat, there is one described in Japanese Patent Laid-Open No. 2-14936 filed by the present applicant.

This antistatic mat (1), as shown in Figure 1+,
On the back side of the base fabric (2) where the pile (4) is driven,
An antistatic mat on which a backing layer (3) is formed, and the tip of the conductive fiber (8) protrudes from the paper surface formed using conductive fibers (8) such as carbon i & fiber. Paper (5) is adhered to at least one side of the base fabric (2).

In this antistatic pine) (1), the discharge paper (5)
has extremely low mechanical strength. For this reason, this discharge paper (5
) is bonded to the base fabric (2) via an adhesive (9) to strengthen it.

(Problems to be Solved by the Invention) However, in the antistatic mat described in JP-A-2-14936, in which discharge paper is adhered to the surface of the base fabric, when piles are driven into the base fabric, Since the pile is driven from the discharge paper side, the discharge paper is likely to be destroyed, and there is a problem that the discharge function of the discharge paper is impaired.

In addition, in cases where discharge paper is adhered to the back side of the base fabric, the discharge paper is fully adhered to the base fabric with an adhesive to increase the strength of the discharge paper, and there is no space between the base fabric and the discharge paper. The discharge function of the discharge paper was impaired by the adhesive used in the discharge paper.

Furthermore, although this antistatic mat has a discharging paper and has a discharging function, it does not have enough static capacitance to ground the static electricity charged on the human body to the antistatic mat side from the human body. That was enough.

According to the inventor's experiments, if the static electricity charged on the human body is grounded from the human body to an antistatic mat, and the static electricity is discharged by this mat, and the static electricity on the human body is reduced to 3.0 V or less, the discharge It has been revealed that the electric shock to the human body caused by this phenomenon is eliminated.

However, JP-A-2-14936 having the above configuration
The antistatic mat described in the publication can reliably eliminate electric shock to the human body caused by discharge phenomena3.
It was not possible to achieve a charging voltage lower than Okv.

The present invention was made in view of these problems,
3. By achieving a charging voltage of less than Okv, it instantly removes static electricity charged on the human body inside the car.
It is an object of the present invention to provide an antistatic mat that can eliminate discomfort caused by discharge phenomena when getting on and off the vehicle.

Means and operation for solving problem 1) In order to achieve the above object, the invention according to claim 1 provides the following:
An antistatic mat having a backing layer formed on the back side of a base fabric, the discharge paper containing conductive fibers such as carbon fibers and a part of the conductive fibers protruding from the paper surface, It is partially adhered to the back side to form a gap between it and the base fabric, and a pile containing conductive fibers is driven to penetrate the discharge paper and the base fabric. ``Antistatic mat, characterized in that a conductive cloth containing conductive fibers is placed on the back side of the paper so as to be in contact with the conductive fibers of the pile.''

In addition, in the invention described in M1 item 2, in the invention described in claim 1, ``an antistatic mat characterized in that a conductive layer containing a conductive material is provided on all or part of the back surface of the discharge paper. ” was its gist.

In addition, in the invention according to claim 3, the gist of the invention is ``an antistatic mat characterized in that the backing layer contains conductive fibers such as carbon fibers'' in the invention according to claim 1 or 2. did.

In addition, in the invention set forth in claim 4, in the invention set forth in claim 1, 2 or 3, ``the conductive cloth is hung on a hook made of a conductive material fixed to the floor surface of the automobile to prevent static electricity. The company's gist was "an antistatic mat characterized by being connected to a ring made of a conductive material that prevents the mat from shifting."

Hereinafter, the antistatic mat of the present invention will be explained in detail according to the drawings.

As shown in FIG. 1, FIG. 2, and FIG. is cut into a predetermined shape. This base fabric (12)
and discharge paper (1) placed on the back side of the base fabric (12).
5), as shown in Figure 3, a plurality of piles (14
) is driven into the base fabric (12) and the discharge paper (15) so as to form a substantially U-shape.

The pile (14) is made of electrically nonconductive synthetic fibers such as polyamide fibers, and is made of antistatic pine).
(11) is in a state where the entire front side is covered with this pile (14) and is easily charged. Also, pile (1
4) Conductivity! Since it contains lI fibers (18), when the human body comes into contact with the front side of the antistatic pine (11), static electricity charged on the human body is easily grounded to the mat (11). It looks like this.

In addition, the pile (14) to be driven includes one made only of synthetic an, and one made of synthetic fiber containing conductive edge 1II (18), and the base fabric (12) contains these two types. A pile (14) is driven in.

The pile (14) containing conductive fibers (18) may include a plurality of synthetic fibers, carbon fibers, ceramic fibers, metal fibers, etc. that have conductivity*! It is preferable to bundle a plurality of 1t (18) and twist them together to have a predetermined thickness. It is thought that the static electricity charged on the pile (14) is led to the conductive cloth (50), which will be described later, through the conductive fibers (18) and is held in the conductive cloth (50). Note that the base fabric (12) does not necessarily have 2
It is not necessary to drive different types of piles (14), but only piles (14) containing conductive fibers (18) may be driven.

A discharge paper (15) is partially adhered to the back surface of the base fabric (12) described above.

The discharge paper (15) is a paper formed using conductive fibers such as carbon M fibers, and a portion of the conductive fibers protrudes from the surface of the paper. The discharge paper (15) includes, for example, conductive fibers such as carbon fibers, metal fibers, conductive ceramic fibers, 3 to 15% by weight, polyester fibers, etc., as described in JP-A-62-156395. A paper consisting of synthetic fibers such as 20 to 70% by weight, the balance being wood bulbs and adhesives is preferred. The fineness of both conductive fibers and synthetic fibers is 1 to 5 d, and the fiber length is 3 to 6.
Preferably. The discharge paper (15) is made by mixing these conductive fibers, synthetic fibers, wood bulbs, and adhesives in the ratios within the above range, and then shredding this mixture through a beating machine to make a uniform mixture, and then wet paper making. Manufactured by law. The discharge paper produced in this way (15
) per square centimeter, more than 50 conductive fibers (not shown) protrude irregularly from the surface of the discharge paper (15) vertically or diagonally, and the conductive cloth (
50) is discharged into the air from this protrusion through the conductive edge If (18).

An adhesive (19) is interposed between the discharge paper (15) and the base cloth (12) in the form of dots, nets, lines, circles, etc., so that the discharge paper (15) and the base cloth (12) are partially adhered.

When the discharge paper (15) and the base fabric (12) are partially adhered with the adhesive 19), as shown in FIG. This results in the formation of a portion that is bonded with the adhesive (19) and a portion that is not bonded. The bonded portion acts to prevent separation of the discharge paper (11) and the base fabric (12).

A gap (30) is formed between the discharge paper (11) and the base fabric (12) in the portion that is not bonded.

A conductive cloth (50) containing conductive fibers is arranged on the back side of the discharge paper (11) so as to be in contact with the conductive fibers (18) of the pile (14).

The conductive cloth (50) is made by weaving or knitting conductive fibers in a lattice shape, spider web shape, branch shape, etc., has flexibility, and has a base cloth 12), a discharge Good compatibility with paper (15) and backing layer (13). Also, this conductive cloth (
For example, if 50) is used with a regular surgical gauze-like opening, the backing layer will penetrate into the openings of the conductive cloth 50) and become integrated, making it difficult to peel off. There is no fear of such things. The conductive fibers used in this conductive cloth (50) are placed in contact with the conductive fibers (18) of the pile (14), and the same! It has conductivity and has a conductive component exposed or protruding on the surface of the fiber so that the static electricity introduced by the fiber (18) can be retained, and it can be electrically connected to the fiber (!8). It can be of any structure. For example, Polly P
- Conductive M fibers made of aromatic polyamide fibers such as phenylene terephthalamide fibers with copper plating and chrome plating are used, and these are woven into a lattice shape, which has excellent conductivity, tensile strength, and anti-larval properties. It has excellent properties and can be cited as a preferred example.

Backing j! so that this conductive cloth (50) is in contact with the conductive fibers (18) of the pile (14)! (+3) located on or in the backing layer (13). As a result, it is thought that the static electricity charged on the pile (14) is guided through the conductive fiber (18) to the conductive cloth (50) in contact with it and is retained in the conductive cloth (50). . In addition, the size of the conductive cloth (50) is as follows:
Not only what is shown in the figure, but also what is shown in Figure 4,
In order to prevent the antistatic mat (11) from shifting, a ring (16) attached to the peripheral edge of the antistatic mat (11) may be sized only to the peripheral edge.

The antistatic mat (1) of the present invention constructed as described above
In the case of 1), the static electricity charged on the human body inside the car will cause the pile (1) of the antistatic pine) (11) to be damaged every time the human body comes into contact with the antistatic pine) (11).
4), the static electricity charged in the pile (14) is guided to the conductive cloth 50) by the conductive A fibers (18) contained in the pile (14), and the static electricity charged in the pile (14) is guided to the conductive cloth 50). is maintained. Then, a gap rW1 (3o ) is considered to be an air discharge. In addition, a part of the static electricity charged on the pile (14) is guided to the discharge paper (15) through the base fabric (12) and the adhesive (19), and is transferred to the conductive fibers (not shown) of the discharge paper (15). It is thought that the discharge is directly carried out in the air.

In addition, as shown in Fig. 3, a discharge paper (15) and a conductive cloth (5) are used.
0) may be provided with a conductive layer (20). The conductive layer (20) is made of a conductive material formed by molding carbon, conductive ceramics, metal, etc. into a fibrous or powdered form, and a discharge paper (20).
15) It is stacked on all or part of the back surface and provided in a layered manner. In a case where the conductive layer (20) is provided on a part of the back surface of the discharge paper (15), the conductive layer (20) is attached to the discharge paper (
+5) Examples include those with a net or stripe pattern on the back side. When this conductive layer (20) is provided,
The static electricity charged in the pile (14) is transferred to the conductive cloth (50) by the conductive fibers (]8) contained in the pile (14).
It is also guided to the conductive layer (20), and these conductive 1ti
(20) and become retained within the conductive cloth (50). Therefore, the static electricity holding capacity of the antistatic pine) (11) will further increase, and it is thought that the static electricity charged on the human body will be more easily grounded to the antistatic pine) (11).

Moreover, as shown in FIG. 5, the antistatic mat of the present invention (1
The backing FW (13) in 1) is not limited to one made solely of thermoplastic resin such as vinyl chloride resin,
The conductive wire N (26) is made by adding conductive fibers such as carbon fiber Elf (26) and a plasticizer to a thermoplastic resin.
is backing! (13) They may be uniformly dispersed throughout and provided in contact with each other. In this case, since the backing layer (13) becomes conductive, some of the static electricity charged on the pile (14) becomes conductive! ili ii (18
) through the conductive net (50) and the conductive ff1 (20), it is also led to the backing layer (13) and is thought to be held there. As a result, the antistatic pine 1-(I
It is thought that the static electricity retention capacity of 1.) can be further improved, and the electrostatic charge on the human body can be further reduced. In addition, some of the conductive fibers (26) of the backing layer (13) configured as described above protrude from the surface of the backing N (13), so they are held within the backing 1'@(+3). It is believed that static electricity is also discharged in the air from the conductive fibers protruding from the surface of the backing layer (13).

Additionally, as shown in Figures 1 and 2, a hook (17) made of conductive material such as iron or copper is fixed to the floor of the vehicle.
The ring (16) to prevent the antistatic mat (11) from shifting is attached to the antistatic mat (11).
The antistatic pine (11) may be punched out from above and below and attached to the edge of the ring (11), and the conductive cloth (50) may be connected to this ring (16). In this case, the static electricity held in the conductive cloth (50) will be grounded to the car floor through the ring (16) and the hook (17), which will reduce the static electricity removal rate (static electricity) of the antistatic pine (11). It is thought that the degree of discharge from the mat to other conductors or into the air can be dramatically improved.

Next, a method for manufacturing the antistatic mat having the above structure will be explained with reference to the drawings.

First, as shown in FIG. 6, a base fabric (12) made of a porous sheet material such as nonwoven fabric, mesh, polyamide woven fabric, etc.
is cut into a predetermined shape, and adhesive (
19) is applied partially in the form of dots, nets, lines or circles in an amount of about 30 g per square meter of the base fabric (12).

Although any adhesive may be used as the adhesive (19), thermoplastic resins such as polyethylene, polyamide, polyethylene terephthalate, polybutylene terephthalate, polypropylene, and polyvinyl chloride are preferred. In particular, if you use a net-shaped resin made of polyethylene or other highly heat-fusible resin, you can simply place it on the base fabric (I2), saving you time and effort in manufacturing. can. It is also possible to add a conductive material such as carbon, metal, or conductive ceramics to the adhesive (+9), and by using this adhesive (19), the conductive performance of the discharge paper (15) can be further improved. It is considered possible to do so.

Next, as shown in FIG. 7, discharge paper (15) is laminated on the adhesive (19) applied to the base fabric (12), and
2) Partially adhere the discharge paper (15) to the paper.

After partially adhering the discharge paper (15) to the back side of the base fabric (12) as described above, as shown in FIG. 9, these base fabrics (12)
And discharge paper (15), pile (14) and base fabric (12)
It is implanted so that it penetrates from the side to the conductive layer (20) side, forming a substantially U-shape.

Next, as shown in the first O concave, conductive cloth (500
), and then a base fabric (I2) formed by driving the pile (14) thereon is placed, and the mold (25) is heated to semi-gelatize the resin sol to form the base fabric (12). , discharge paper (
+5) and conductive cloth (5o). At this time,
It is preferable that the resin is permeated to such an extent that the gap between the base fabric (12) and the discharge paper (15) is not eliminated.

Thereafter, by cooling the mold (25), the resin is solidified, and the antistatic mat described in claim 1 can be manufactured.

In order to improve the static electricity holding function of the antistatic mat, a conductive layer (20) may be provided on the discharge paper (15) side, as shown in FIG. In this case, the conductive layer (20) is formed by adding fibers or powder made of a conductive material to an adhesive and applying it to the back side of the discharge paper (15), or by applying an adhesive to the back side of the discharge paper (15). After that, the conductive material can be provided by scattering fibers or powder made of the conductive material. The adhesive used for this conductive layer (20) may be the same as the adhesive (19) used to bond the base fabric (12) and the discharge paper (15). This conductive layer (20)
The amount of coating on the discharge paper (15) is as follows:
Preferably, the conductive material is contained in an amount of at least 1% by weight per 30g of adhesive per square meter. This is because below 1% by weight, this conductive layer (
This is because it is thought that the function of retaining static electricity (20) cannot be fully exerted.

In addition, conductive fibers such as carbon fibers and a plasticizer are added to thermoplastic resin such as vinyl chloride resin, and a resin sol in which the conductive fibers are uniformly dispersed is applied onto the mold. You can also do it. In this case, the amount of conductive fibers to be added is preferably at least 2% or more based on the weight of the entire resin sol.

This is because if it is less than 2%, it becomes difficult to disperse the conductive f&male over the entire backing layer and bring them into contact with each other, making it impossible to obtain the intended static electricity retention function.

(Example) Below, one example of the antistatic mat of the present invention will be described in detail.

``Antistatic Mat'' - Antistatic mat: has the structure shown in Figure 3, and has dots of adhesive that bond the discharge paper and the base fabric, and conductive mats that are about the same size as the conductive paper. A fabric with conductive paper placed on the back side, size: 0°50x0.74 = 0.
37rn2 [Base fabric: Polyester non-woven fabric, Pile: Polyamide fiber (1600 denier), Conductive fiber included in the pile: Thunderon [manufactured by Nihon Kasuke Dyeing Co., Ltd.]
, Discharge paper: Zoldion [manufactured by Toshi Co., Ltd., adhesive for bonding the discharge paper and base fabric: polyamide adhesive, conductive layer = (carbon powder + polyamide adhesive) provided on the entire surface of the base fabric Something. (Carbon powder + polyamide adhesive)
The coating amount was 30 g per square meter of discharge paper. Also, the content of carbon powder was 0.6 g. Conductive cloth: Conductive fibers (200 denier) with steel plating applied to the surface of Bory ρ-phenylene terephthalamide fibers and further chrome plating applied to the surface are woven into a surgical gauze-like mesh structure. Overlock thread: conductive fiber in the system 100d x 2 threads/1n
ch) Measure the electrostatic voltage (kv) of the human body when using the antistatic mat with the above structure.

Measuring device: As shown in Figure 11, an insulating material (40) is spread on an aluminum floor (23), a polyamide carpet (21) is spread on top of this, and a chair (28) is placed on this carpet (21). ) and an antistatic mat (11).

A person (29) sits on a chair (28) with his feet covered with anti-static pine) (
11). Rub your back and butt against the chair (28) 10 times.

The static electricity charged on the human body at this time is removed by the conductor (41),
It is guided to a potential measuring device (44) via an aluminum plate (43) attached to an insulating rod (42), and this potential measuring device (44)
The charging voltage is measured by The temperature at the time of measurement was 2
The temperature was 0°C and the humidity was 20%.

The electrostatic voltage of a human body was measured using the above device. In addition, the measurement was performed when there was no ground discharge from the above antistatic mat to the floor surface (I
A), when a ring is passed through the floor and a ground discharge is made (1B
) and the case (1c) in which a ground discharge was caused through an overlock around the periphery of the antistatic mat. The results are shown in Table 1.

- Actual Coverage Jul An antistatic mat having the same structure as that shown in Example 1 except that the size of the conductive cloth was changed to the size shown in FIG. Measurements were taken when the charged voltage of the human body was not discharged to the ground (2A), when it was discharged to the ground through a ring on the floor (2B), and when it was discharged to the ground through an overlock around the periphery of the antistatic mat (2C). This result (2AX2
BX2C) are shown in Table 1.

1 Comparison 11 Antistatic mat: Consisting of the structure shown in Figure 12, discharge paper and base fabric are fully bonded with adhesive, size:
0.50XO,? 4=0.37 m2 [Base fabric: Polyester nonwoven fabric, Pile: Polyamide (1600 denier), Conductive fibers included in the pile: Thunderon [manufactured by Nippon Kasuke Dyeing Co., Ltd.], Discharge paper: Zoldion [Toshi Co., Ltd.] company! ! ], Adhesive for bonding discharge paper and base fabric: polyamide adhesive] The electrostatic charge voltage of the human body when using the antistatic mat with the above structure was measured in the same manner as in Example 1, and the results were ( Table 1 shows the case in which the antistatic mat was not grounded to the floor surface (only 3A) was conducted.

(Margins below) From Table 1, it can be seen that in Comparative Example 1, about half of the static electricity was removed, but 3. It was not possible to achieve a charging voltage lower than Okv. On the other hand, according to Example 1, when IA) without ground discharge, the value was 3.0, which was far below ■2,2
It was possible to realize a charging voltage of 1<v. Furthermore, the charged voltage on the human body when discharged to the ground was -2.5kv when the ring was discharged to the ground (IB), and -2.7kv when the discharged from the overlock to the ground (IC) was astounding. .

Also, for Example 2, almost the same as Example (2A)
is 2.1kv, (2B) is -1.3kv, (2C) is -
It showed a value of 1.6kv.

(Effects of the Invention) By employing the above structure, the antistatic mat according to claim 1 instantly removes static electricity that has been charged on the human body, thereby reducing discomfort caused by discharge phenomena when getting on and off the vehicle. In the antistatic mat of claim 2, the static electricity retention capacity of the material is contained due to the conductive layer provided.3. Okv
It is possible to achieve a charged voltage of 2 or 2 kV by rotating 1:'.

In the antistatic mat according to claim 3, since the bath soaking layer has a static electricity holding function, the static electricity holding capacity of the mat is roughly increased, making it easier to ground static electricity from the human body. Therefore, with the mat, static electricity charged on the human body can be removed more efficiently.

In the antistatic mat according to claim 4, since the ring made of a conductive material is connected to the conductive cloth and is hooked on the hook made of a conductive material fixed to the automobile floor surface, the ring made of the conductive material is connected to the conductive cloth. The static electricity held in the conductive cloth was discharged to the ground, so -2.5kv
This amazing charging voltage can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the state in which the antistatic machine of the present invention is installed on the floor of a car, Fig. 2 is a sectional view showing the state taken along line AB in Fig. 1, and Fig. FIG. 4 is a perspective view showing another example of the antistatic mat of the present invention, and FIG. 5 is a separate view of the antistatic mat of the present invention. Figures 6 to 10 are enlarged cross-sectional views showing the manufacturing process of the antistatic mat of the present invention, and Figure 11 is an apparatus for measuring the electrostatic charge on a human body when using the antistatic mat. FIG. 12 is an enlarged sectional view showing a conventional antistatic mat. Explanation of symbols (13)...backing layer, (15)...discharge paper,
(16)...Ring, (17)...Hook, (
18) Conductive fiber, (20) Conductive layer, (1
9)...Adhesive, (30)...Gap, (50)
...Conductive cloth.

Claims (4)

[Claims] (1) An antistatic mat with a backing layer formed on the back side of the base fabric, which contains conductive fibers such as carbon fibers, and a discharge paper in which a part of the conductive fibers protrudes from the paper surface. A pile containing conductive fibers is partially adhered to the back surface of the base fabric to form a gap between the paper and the base fabric, and a pile containing conductive fibers is driven so as to penetrate through the discharge paper and the base fabric. Furthermore, an antistatic mat characterized in that a conductive cloth containing conductive fibers is arranged on the back side of the discharge paper so as to be in contact with the conductive fibers of the pile. (2) The antistatic mat according to claim 1, characterized in that a conductive layer containing a conductive material is provided on all or part of the back surface of the discharge paper. (3) The antistatic mat according to claim 1 or 2, wherein the backing layer contains conductive fibers such as carbon fibers. (4) A claim characterized in that the conductive cloth is connected to a ring made of a conductive material that prevents the antistatic mat from shifting by being hooked on a hook made of a conductive material fixed to the floor surface of the automobile. The antistatic mat according to item 1, 2 or 3.