JPS6349483B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antistatic tufted carpet, particularly a super antistatic tufted carpet suitable for computer rooms.

When people walk on a carpet in a computer room, their bodies become charged with static electricity due to friction, but since computers are easily affected by static electricity, the amount of static electricity must be kept to a minimum. Furthermore, if the carpet has good conductivity, there is an increased risk of electric shock to the human body in the unlikely event of an accident. To prevent this hazard, computer room carpets must also be highly insulating.
In this way, computer room carpets are required to have the mutually contradictory performance of antistatic and insulating properties, so conventional antistatic carpets, which only increase conductivity by adding conductive fibers, are not suitable for computer rooms. is inappropriate. Furthermore, dust is prohibited on computers, so
Carpets made of spun yarn are unsuitable, and are naturally limited to carpets made of synthetic filament yarn.

An object of the present invention is to provide a super antistatic carpet which has the necessary insulation resistance and which charges a human body on it with an extremely small amount of charge.

In order to achieve the above object, the present invention provides a carpet consisting of a non-conductive multifilament tufted onto a base fabric made of polypropylene, and a backing fabric containing conductive fibers attached to the back side of the base fabric via a conductive latex. In this method, a non-conductive multifilament is formed from two types of synthetic fibers located on the (+) side of each leather and the (-) side of vinyl chloride in the triboelectric series, and the surface of the multifilament is coated with a conductive substance. It is characterized in that it is made into a pile yarn by attaching a coated surface conductive synthetic fiber monofilament and an internal conductive synthetic fiber monofilament in which a conductive substance is inserted.

If the two types of synthetic fibers used are polyamide multifilament and polypropylene multifilament, and their ratio is 6:4 to 4:6, the human body will be The charging potential was 1KV when peeled off in a test based on the JIS rug test method.
It can be:

As the surface and internal conductive fibers to be attached to the multifilament, polyamide monofilament with carbon as the conductive substance is preferable from the viewpoint of compatibility with the non-conductive multifilament. Carbon-coated monofilament has good electrical contact, so it is highly effective in dissipating static electricity generated in the human body, but the carbon coating on the surface is less durable.
It is undesirable to increase the mixing amount. Monofilaments with carbon inside have high carbon durability, but the surface electrical contact is poor, so monofilaments alone are not effective in dissipating static electricity. Therefore, both are used together to compensate for the shortcomings of each. Since the carpet backing fabric has neither appearance nor compatibility with the pile yarn, any conductive fiber with good electrical contact can be incorporated, including carbon-coated monofilament. The amount of conductive monofilament attached to the non-conductive multifilament to be tufted is adjusted so that the insulating properties of the carpet are maintained, that is, the surface electrical resistance and volume electrical resistance are maintained.
Adjust so that it is 10 to the 5th power ohm or more.

In the carpet of the present invention constructed as described above, one of the two main types of fibers constituting the pile is located on the (+) side of the frictional electrification series compared to the leather, and the other is located on the (-) side of the vinyl chloride. , static electricity generated in the human body is relatively small. Since the generated static electricity escapes through the conductive fibers, the amount of charge is significantly reduced. For example, in the JISL1021 carpet charging property test, the potential during peeling, which is higher than the saturation potential during sliding, is less than 1 KV in absolute value. The conductive fibers have a carpet surface and volume electrical resistance of 5/10.
Since it is mixed to the extent that it does not exceed the squared ohm, the insulation of the carpet is guaranteed in case of an emergency. The carbon-containing synthetic fiber monofilament mixed as a conductive substance is compatible with the attached non-conductive multifilament.

Next, the carpet of the present invention will be explained based on examples and comparative examples shown in the drawings. Example A in Figure 1
The three comparative examples B, C, and D differ only in the pile yarn 1, and the other polypropylene base fabrics 2,
The conductive latex 3 and the backing fabric 4 are exactly the same.
None of these are treated with antistatic agents, but the polypropylene woven lining has a weft of polypropylene filament (1700D) and two carbon surface-coated polyamide monofilaments (22D, trade name Metalian I, made by Teijin, Metalian is registered) trademark)
It is a drawn thread and has electrical conductivity. As shown in FIG.
Polyamide multifilament 12, 22D carbon surface coated polyamide monofilament 13 (trade name Metallian I, made by Teijin, Metallian is a registered trademark) 22D carbon internally mixed polyamide monofilament 14 (trade name Metallian F, manufactured by Teijin, Metallian is a registered trademark) Each yarn is a single twisted yarn, and the pile length, pile density, and pile weight are 4 mm, 39/10 cm x 38/10 cm, and 456 g/m ² .

On the other hand, the composition, pile length, pile density, and pile weight of the pile yarns of Comparative Examples B, C, and D are as follows.

B: - 49.7% acrylic, 50% polypropylene, 0.3% copper-containing acrylic (product name: Sandalon, manufactured by Nippon Satsuki,
Sandalon is a registered trademark) Blended triplet yarn 3/4.9′S,
Carbon surface coated polyamide monofilament
22D (product name: Metalian I, made by Teijin, Metalian is a registered trademark), each one twisted yarn Pile length: 5.5mm Pile density: 31/10cm x 31/10cm Pile weight: 1000g/m ² C: - 49.7% acrylic, polyester 50%, 0.3% copper-containing acrylic (trade name: Sandalon, manufactured by Nippon Satsuki, Sandalon is a registered trademark) blended triplet thread 3/4.9'S, carbon surface coated polyamide monofilament 22D
(Product name: Metalian I, made by Teijin, Metalian is a registered trademark) Pile length: 5.5mm Pile density: 31/10cm x 31/10cm Pile weight: 1000g/m ² D: - Polyamide multifilament 3500D, carbon Internally mixed polyamide monofilament 22D (trade name: Metalian F, made by Teijin, Metalian is a registered trademark), each twisted yarn Pile length: 4.0mm Pile density: 39/10cm x 30/10cm Pile weight: 710g/m ² A, B A 90 cm square test piece was taken from the carpets of , C and D and tested for electrical resistance and chargeability. Electrical resistance is the surface resistance and volume resistance at a temperature of 20°C.
Measurements were taken in an environment with a humidity of 20%, a temperature of 20°C, and a humidity of 80%. The test piece was placed on an insulating plate, and two electrodes (diameter 6 cm, weight 2 kg) were placed on top of it with a center spacing of 15 cm.
The test piece was placed on the metal plate, the resistance between the electrodes on the carpet and the metal plate was measured, and this was taken as the surface resistance of the carpet. . Measurements were performed multiple times by changing the positions of the electrodes.

The electrostatic property test was conducted on three types of footwear according to the rug test method JISL1021. However, the humidity was set to 20%, which is stricter than the JIS method, and the measured potential was measured at the time of peeling when both legs were raised, which was even higher than that at the saturation time of walking and sliding.

The results of the test were as follows.

A: Example Surface resistance (ohm) 0.18×10 ⁸ , 0.35×10 ⁸ , 0.20×10 ⁸ , 0.19×10 ⁸ ,
0.30×10 ⁸ , 0.26×10 ⁸ , 0.40×10 ⁸ , Volume resistance (ohm) 0.14×10 ⁸ , 0.19×10 ⁸ , 0.19×10 ⁸ , 0.11×10 ⁸ , Electrostatic property (KV) Vinyl sandals: −0.26 , -0.18, -0.05 Leather-soled shoes: 0.9, 0.76, 0.65 Synthetic rubber-soled shoes: 0.10, 0.18, 0.16 B: Comparative example Surface resistance (ohm) 0.22×10 ⁷ , 0.21×10 ⁷ , 0.18×10 ⁷ , 0.17 ×10 ⁷ ,
0.23×10 ⁷ , 0.26×10 ⁷ , 0.14×10 ⁷ , Volume resistance (ohm) 0.24×10 ⁷ , 0.16×10 ⁷ , 0.20×10 ⁷ , 0.30×10 ⁷ , Electrostatic property (KV) Vinyl sandals: −0.45 , −0.35, −0.42 Leather sole shoes: 1.18, 0.83, 0.16 Synthetic rubber sole shoes: 0.16, 0.17, 0.19 C: Comparative example Surface resistance (ohm) 0.25×10 ⁷ , 0.20×10 ⁷ , 0.17×10 ⁷ , 0.19 ×10 ⁷ ,
0.12×10 ⁷ , 0.31×10 ⁷ , 0.11×10 ⁷ , Volume resistance (ohm) 0.56×10 ⁷ , 0.42×10 ⁷ , 0.76×10 ⁷ , 0.66×10 ⁷ , Electrostatic property (KV) Vinyl sandals: 0.14, 0.21, 0.12 Leather sole shoes: 1.14, 1, 26, 1.62 Synthetic rubber sole shoes: 0.34, 0.37, 0.47 D: Comparative example Surface resistance (ohm) 0.35×10 ⁹ , 0.50×10 ⁹ , 0.25×10 ⁹ , 0.90× 10 ⁹ ,
0.60×10 ⁹ , 1.00×10 ⁹ , 0.55×10 ⁹ , Volume resistance (ohm) 0.55×10 ⁹ , 0.30×10 ⁹ , 0.90×10 ⁹ , 0.45×10 ⁹ , Electrostatic property (KV) Vinyl sandals: −4.65 , -5.27 Leather-soled shoes: -2.49, -2.65 Synthetic rubber-soled shoes: -0.35, -0.43 From the results of the above tests, both the example and the comparative example have electrical resistance of 10 to the 6th power ohm or more and good insulation, but
It can be seen that there is no shoe other than the embodiment of the present invention that can suppress the charging potential to 1 KV or less for all types of footwear. In particular, the charging potential of D, in which the main non-conductive fibers of the pile yarn are made of a single material (polyamide), is large in the case of vinyl sandals. It suggests what should be configured. Although B and C contain two monofilaments coated with carbon surface and have lower electrical resistance than A, the charging potential in leather sole shoes is A.
This is thought to be due to the fact that the main fibers constituting the pile yarns B and C, acrylic, polypropylene, and polyester, are all located on the same (-) side with respect to the charged row epithelial leather. The main fibers constituting the pile of A, polyamide, are located on the (+) side, and polypropylene is located on the (-) side. Therefore, it is expected that a pile yarn made of polyamide and polyester, which have a similar relationship, will also have the same antistatic effect as in the example.

It is said that it is desirable for a carpet for a computer room to have a charging potential of 1 KV or less in the above test, and the carpet of the present invention can fully meet this requirement. In addition, by combining internal conductive synthetic fibers with excellent durability with surface conductive synthetic fibers with excellent contact properties, it is expected that high-performance antistatic properties will be maintained permanently.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a cross section of a carpet according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing the pile yarn of FIG. 1. 2: Polypropylene base fabric, 3: Conductive latex, 4: Lining fabric, 11: Polypropylene multifilament, 12: Polyamide multifilament, 13: Carbon surface coated polyamide monofilament, 14: Carbon internally mixed polyamide monofilament.

Claims (1)

[Scope of Claims] 1. A carpet consisting of a non-conductive multifilament tufted to a polypropylene base fabric, and a backing fabric containing conductive fibers adhered to the back surface of the base fabric via a conductive latex, A conductive multifilament is formed from two types of synthetic fibers with different triboelectric properties located on the (+) side of the charged column epithelial leather and on the (-) side of the vinyl chloride, and conductive to the non-conductive multifilament. 1. A super-antistatic carpet characterized by intertwining surface conductive synthetic fibers whose surfaces are coated with a conductive substance and internal conductive synthetic fibers which have a conductive substance inside. 2. The super antistatic carpet according to claim 1, characterized in that the conductive substance is carbon. 3. Super antistatic properties according to claim 1 or 2, characterized in that the carbon surface-coated polyamide monofilament and the carbon-incorporated polyamide monofilament are used as surface conductive synthetic fibers and internally conductive synthetic fibers. Carpet. 4. The super antistatic carpet according to any one of claims 1 to 3, characterized in that the non-conductive multifilament is formed from polypropylene synthetic fibers and polyamide synthetic fibers. 5 A 1800 to 2000 denier multifilament made of 40% to 60% polypropylene and 60% to 40% polyamide is intertwined with a 22 denier carbon surface-coated polyamide monofilament and a 22 denier carbon internally mixed polyamide monofilament. The super antistatic carpet according to claim 4, characterized in that: