JPS6116803Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to antistatic footwear for indoor use, and particularly to antistatic footwear suitable for wearing indoors where electronic parts and equipment are handled. In general, natural leather, synthetic leather, natural rubber, synthetic rubber, synthetic resin, felt, etc. are used as sole materials for men's shoes, women's shoes, slippers, etc.
All of these materials are electrically insulative, so if you walk on non-conducting materials such as carpets, rugs, flooring (linoleum, etc.) while wearing these footwear,
It is known that static electricity accumulates in the human body.
As a result, when it comes into contact with a conductor such as a metal part, it suddenly discharges and receives a so-called electric shock. Under normal circumstances, such electric shocks or discharges do not cause much harm to the human body;
There is nothing that cannot be tolerated. However, especially IC, LSI
When handling electronic parts, electronic components, or electronic equipment such as, there is a risk of destroying the parts or equipment, so such discharge must be suppressed as much as possible. In other words, there is a demand for footwear that prevents the human body from being easily charged with static electricity and which allows the charged static electricity to leak out as quickly as possible. Traditionally, this type of footwear has been made by mixing carbon black or metal powder into rubber etc. to increase electrical resistance.
There is outdoor footwear that uses an antistatic outsole controlled to 10 ⁴ to ^{10 8} Ω. This prevents electric charge from accumulating on the human body and from electric shock when it comes into contact with a charged object or a high-voltage object. According to such footwear, carbon black or metal powder is mixed into the outsole to give it conductivity, so when a load is applied to the outsole and the midsole by wearing the footwear, the outsole - The disadvantage is that the contact resistance between the inner and outer soles increases, the conductivity decreases, and the preferred resistance value of 1×10 ⁴ to 10 ⁸ Ω, which is suitable for corona discharge, is no longer exhibited. For this reason, a sufficient discharge effect cannot be expected indoors, where non-conductive flooring is used, where electric charges tend to accumulate, and where the earthing function is difficult to achieve, although this may be the case outdoors where there is a ground and discharge is likely to occur. On the other hand, it is extremely difficult to control the electrical resistance when worn by humans (hereinafter referred to as dynamic electrical resistance) by blending carbon black or metal powder. It was impossible to control. The present invention provides antistatic footwear for indoor use that does not have such drawbacks, and more specifically, antistatic footwear for indoor use that can easily have a dynamic electrical resistance of 1×10 ⁴ to 1×10 ⁸ Ω, which is preferable for corona discharge. The purpose is to The antistatic footwear for indoor use according to the present invention has a static electrical resistance of 1× ¹⁰ A good conductor sheet having a static electrical resistance of 10 ² to 10 ³ Ω is provided over an area of 2 cm ^{2 or} more so as to be in contact between the outsole of 1×10 ⁸ Ω and the conductive middle sole. It is something to do. An embodiment of the present invention will be described in detail based on the drawings. 1 and 2 are a partially transparent perspective view and a side sectional view of an embodiment of footwear according to the present invention, and the same reference numerals indicate the same members in the figures. As is clear from FIGS. 1 and 2, the footwear basically consists of an outsole 1 made of antistatic rubber, an insole 2 placed on the outsole 1, and the outsole 1 and the insole. It consists of a flap 3 that is integrated with the 2. The outsole 1 is mixed with carbon black or metal powder so that the electrical resistance (resistance when a person is not wearing it, hereinafter referred to as static electrical resistance) is 1×10 ⁴ to 1×10 ⁸ Ω. The insole 2 is made of a base fabric made of, for example, organic conductive fibers (organic fibers in which carbon black particles are uniformly dispersed and arranged). Further, the sleeve 3 has a base fabric 4 similar to the insole 2 adhered to the side (inside) that comes into contact with the human body. The outsole 1, the insole 2, and the heel 3 are integrally bonded together using a conductive adhesive (not shown). According to the present invention, as is clear from FIGS. 1 and 2, a good conductor sheet 5 is provided between the outsole 1 and the midsole 2.
will be established. This good conductor sheet 5 has a static electrical resistance.
This is because if the resistance exceeds 10 ³ Ω, which is 10 ² to 10 ³ Ω, the effect of interposing the good conductor sheet 5 cannot be expected to be significant. Such a good conductor sheet 5 is basically not limited. For example, conductive rubber sheet,
A conductive synthetic resin sheet or the like can be used. In this embodiment, the good conductor sheet 5 is provided at the toe section t and the heel section h, because load is likely to be applied to these sections and contact resistance is likely to increase. In the present invention, the present invention is of course not limited to this, and it may be placed over either the toe part t or the heel part h, or the entire surface of the outsole 1. In addition, since the heel part h usually has a thick outsole 1, it can be made into a box shape as shown in Fig. 1 or a cross-sectional shape as shown in Fig. 2 to provide good conductivity. The area of the sheet 5 can be increased. Incidentally, the electrical resistance R of footwear is expressed by the following equation (1). R=ρl/S...(1) (In the formula, is the volume resistivity, l is the distance between the poles, and S is the pole area) Usually, the pole area S corresponds to the contact area of the outsole and the middle bottom, but In the present invention, since the good conductor 5 is provided between the outsole 1 and the insole 2, a large amount of electricity flows through the good conductor sheet 5, which is easy to pass through, and the outsole 1
The current at the part where the inner sole 2 and the inner sole 2 are in direct contact can be ignored. Therefore, the pole area S can be considered to correspond to the area of the good conductor sheet 5. It has been found that the area S of the good conductor sheet 5 is closely related to the change in dynamic electrical resistance, as is clear from the experimental examples described later. That is, the dynamic electrical resistance value can be controlled by the area S of the good conductor sheet 5. Next, an example will be described. Example: When press-molding a conductive rubber outsole 1 with a static resistance value of 10 ⁴ to 10 ⁸ Ω, the toe portion t and/or heel portion h is 1 mmt with a width of 20 mm and a length of 30 to 50 ^mm.
A good conductor rubber 5 of ~10 ³ Ω was placed and integrally vulcanized. This outsole 1 was provided with an insole 2, which is a base fabric made of organic conductive fibers, and a hem 3, which were then integrated to produce antistatic shoes. Table 1 shows the results of measuring the dynamic electrical resistance of this shoe due to changes in the area of the good conductor sheet.

[Table] As is clear from the results in Table 1, an outsole having a desired dynamic electrical resistance can be easily manufactured by simply changing the area S of the good conductor sheet 5. In addition, in order to obtain a dynamic electrical resistance of 1×10 ⁴ to 1×10 ⁸ Ω,
It has been shown that when a good conductor sheet 5 with a resistance of 10 ² to 10 ³ Ω is used, it is approximately sufficient if it is approximately 2 cm ² to 2×10 ⁴ cm ² , that is, 2 cm ² or more. In the above embodiment, the case of shoes was explained, but the present invention is not limited to this.
It may be in the form of slippers, sandals, etc. As explained above, according to the footwear according to the present invention, the dynamic resistance value can be easily changed by simply changing the area of the good conductor sheet, and the static resistance value of the outsole and the good conductor sheet can be adjusted to 1×10 ⁴ ~ 1×
10 ⁸ Ω, 10 ² to 10 ³ Ω, and the good conductor sheet was
cm ² , the dynamic resistance of footwear can be increased from 1×10 ⁴ to 1×
10 ⁸ Ω, and has the advantage that it can be used as indoor antistatic footwear with excellent discharge properties.

[Brief explanation of the drawing]

FIG. 1 is a partially transparent perspective view of an embodiment of antistatic footwear for indoor use according to the present invention, and FIG. 2 is a sectional view thereof. 1...Osoko, 2...Nakaso, 3...Tachipei, 5...
Good conductor sheet.

Claims (1)

[Scope of utility model registration request] Indoor antistatic footwear, which basically consists of an outsole made of antistatic rubber or antistatic synthetic resin and a conductive insole, has a static electrical resistance of 1 x 10 ⁴ to 1 x 10 ⁸ Ω.
A charging device for indoor use, characterized in that a good conductor sheet having an area of 2 cm ² or more and having a static electrical resistance of 10 ² to 10 ³ Ω is provided between the outsole and the conductive midsole so as to be in contact with both. Prevent footwear.