JPH07142185A - Electrostatic control sheet - Google Patents

Abstract

PURPOSE:To provide an electrostatic control sheet having an excellent air discharge function not impaired easily by crossingly sticking at least two sheets of discharge paper protruded with part of conducting fibers from the surface. CONSTITUTION:This electrostatic control sheet 11 is constituted of a ground fabric 12 such as a nonwoven fabric, the discharge paper 13, a pile 16 containing conducting fibers 75, and a backing layer 17 made of a thermoplastic resin. The discharge paper 13 is manufactured by the wet paper making method with conducting fibers such as carbon fibers, synthetic fibers such as acryl fibers, and a thermoplastic binder of pulp, and part of the conducting fibers is protruded on the surface. The protruding direction has directivity, the protruded fibers 15 are prostrated when a load is applied from one direction, and the air discharge function of static electricity may be possibly impaired. When at least two sheets of discharge paper are crossingly stuck, this effect is rarely inflicted, and the static electricity can be efficiently discharged into the air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antistatic sheet used as an automobile mat, an automobile carpet, or a floor carpet, particularly as a carpet laid in front of a computer room or an elevator hall.

[0002]

2. Description of the Related Art Conventionally, as an antistatic sheet, there is one disclosed in JP-A-2-267893 filed by the present applicant. As shown in FIG. 6, the antistatic sheet 1 is made by adding conductive fibers to make paper, and the discharge paper 3 having a part of the conductive fibers protruding from the paper surface is bonded to the back surface of the base cloth 2. Then, the pile 5 containing the conductive fibers 4 is driven into the base cloth 2 and the discharge paper 3, and the backing layer 6 is formed on the back surface side of the discharge paper 3.

In this antistatic sheet, the discharge paper is made by adding conductive fibers, and the conductive paper has a structure in which a part of the conductive fibers protrudes like an antenna. The static electricity charged in the interior was quickly absorbed and discharged in the air. Further, the pile driven into the base cloth and the discharge paper contains conductive fibers, and a part of static electricity is absorbed by the conductive fibers of the pile and discharged in the air. Was there.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, the discharge paper in this antistatic sheet is made by continuously making paper by passing the net in a certain direction into a tank in which the constituent fibers of the discharge paper are dispersed. Therefore, the paper has a directionality, and the conductive fibers protruding on the surface of the paper where the discharge function is exhibited also have a directionality.

For this reason, for example, when a load is applied in the same direction as the inclination direction of the conductive fibers protruding from the paper surface of the discharge paper, the conductive fibers of the paper lie down and serve as an antenna for discharging static electricity in the air. However, there is a risk that the discharge function of the discharge paper may not be exhibited and the discharge function of the discharge paper may be impaired.

The present invention is a further improvement of the antistatic sheet described in Japanese Patent Application Laid-Open No. 2-267893, which has an excellent aerial discharge function and does not easily impair the function. The purpose is to provide an antistatic sheet.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 is made by adding electroconductive fibers to make paper, and a part of the electroconductive fibers is projected from the paper surface. The discharge paper, the base cloth joined to the discharge paper, and the pile containing the conductive fibers that are punched into the discharge paper side from the base cloth side to have a substantially U shape. In the electrical sheet, at least two sheets of the discharge paper are crossed and adhered to each other.

The invention of claim 2 has as its gist an antistatic sheet, characterized in that an electrically conductive powder is contained in an adhesive for adhering at least two sheets of discharge paper.

The antistatic sheet of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 and 2, the antistatic sheet 11 of the present invention includes a base cloth 12, an electric discharge paper 13, and a conductive fiber 1.
It comprises a pile 16 containing 5 and a backing layer 17. A porous sheet material such as a non-woven fabric, a mesh, or a polyamide woven cloth is used for the base cloth 12, and the base cloth 12 is obtained by cutting each of these materials into a predetermined shape. This base cloth 12
The discharge paper 13 is joined to the.

The discharge paper 13 is a wet papermaking method using conductive fibers such as carbon fibers, metal fibers and conductive ceramic fibers, synthetic fibers such as acrylic fibers and polyester fibers, and thermoplastic binders such as pulp and polyvinyl alcohol. Manufactured by, and a part of the conductive fiber is projected on the surface of the paper. Examples of such discharge paper 13 include 3 to 15% by weight of conductive fiber such as carbon fiber and 2 to synthetic fiber such as acrylic fiber and polyester fiber.
0 to 70% by weight (fineness of the conductive fiber and synthetic fiber are both 1 to 5 d, fiber length is 3 to 20 mm), the balance wood pulp and fibrous thermoplastic binder are mixed in a ratio within the above range, This mixture is further cut into a uniform mixture through a beater and then produced by a wet papermaking method. At least 50 conductive fibers (not shown) per square centimeter of the discharge paper 13 project from the surface of the discharge paper 13, and static electricity is discharged in the air from the projecting portion.

At least two sheets of this discharge paper 13 are crossed and bonded. Since the discharge paper 13 is manufactured as described above, the paper has directionality, and the conductive fibers protruding on the surface of the paper where the discharge function is exhibited also have directionality. In the present invention, as shown in FIGS. 3 and 4, the discharge papers 13 are vertically overlapped and overlapped with each other.
They are adhered to each other with an adhesive. The crossing angle is arbitrary and can be freely selected such as right angle and diagonal. Further, the number of the discharge papers 13 to be overlapped is not particularly limited, and may be appropriately determined in consideration of the price, usage state, application, etc. of the sheets such as two sheets, three sheets and more. As a result, the conductive fibers (not shown) protruding from the surface of the discharge paper 13 are inclined in different directions by the number of intersecting discharge papers 13, and a load is applied in the inclination direction of the conductive fibers in one discharge paper 13. Even if the fibers fall asleep in addition, the conductive fibers in the other discharge paper 13 are not easily affected by the influence, and the static air discharge function of the discharge paper is not disturbed. Moreover, the strength of the discharge paper 13 adhered to a plurality of sheets is increased by that amount, the discharge paper 13 is less likely to be damaged even when the pile 16 is driven, which will be described later, and the pile 16 can be driven with higher density. ..

Further, it is possible to enhance the conductivity by including conductive powder in the adhesive for bonding the discharge papers intersecting each other. Examples of the conductive powder include materials having conductivity such as iron, copper, aluminum and carbon, and the particle size is preferably as small as possible so that the particles can be uniformly dispersed in the adhesive. From the point of 150-4
00 μm is preferable. The adhesive for adhering the discharge papers may be partially present between the discharge papers to form a gap between the discharge papers and the base cloth, or the discharge papers may be entirely adhered to each other. In either case, when the adhesive strength is required, the whole surface adhesive is used, and the strength is relatively small, and when the high static elimination performance is required, the partial adhesive is preferable.

As shown in FIGS. 2 and 5, the base cloth 12 is formed.
A plurality of piles 16 are punched into the discharge paper 13 so as to have a substantially U-shape in a state of penetrating from the base cloth 12 side to the discharge paper 13 side. The pile 16 is classified into two types, one consisting only of synthetic fibers such as polyamide fiber and the other containing synthetic fibers containing conductive fibers 15. still,
The ratio of the two types of piles 16 driven into the mat 11 may be appropriately determined in consideration of the size of the mat 11, the state of use, the price, and the like.

As described above, a plurality of piles 16 are pierced into the base cloth 12 and the discharge paper 13 from the base cloth 12 side to the discharge paper 13 side and are driven into the discharge paper 13 side with thermoplastic such as vinyl chloride resin. A backing layer 17 made of resin is formed,
The pile 15 driven into the base cloth 12 and the discharge paper 13 is fixed.

The backing layer 17 is placed on a backing material made of a thermoplastic resin such as sol-like polyvinyl chloride in which a base cloth and discharge paper are applied on a die (not shown), and the die (shown in the figure). It is possible to form the backing material by gelling the backing material by heating (No.) to semi-gelate the backing material to penetrate into the discharge paper and then cool the mold (not shown). it can.

In the antistatic sheet 11 configured as described above, static electricity charged on the human body in the vehicle is grounded to the pile 16 of the antistatic sheet 11 when the human body contacts the antistatic sheet 11. The pile 16 is absorbed by the discharge paper 13 through the conductive fibers 15 of the pile 16.

The absorbed static electricity is discharged in the air from the discharge paper 13. As described above, since at least two discharge papers 13 are cross-bonded to each other, the conductive fibers protruding from the paper surface are not inclined in one direction, but are inclined in various directions by the number of intersecting discharge papers 13. Therefore, even if a load is applied in one direction, the discharge function of the discharge paper is stored without being hindered, and the number of conductive fibers protruding to the paper surface is increased by the number of intersecting discharge papers. Therefore, the air discharge function of the sheet is also improved by that much, and the static electricity is more efficiently discharged in the air.

The above-described antistatic sheet can be used not only for static elimination by air discharge but also for static elimination by grounding to the floor surface with an earth cord.

[0019]

According to the present invention, by adopting the above configuration,
In the antistatic sheet described above, since at least two discharge papers are cross-bonded and adhered, the conductive fibers protruding from the paper surface are not in one direction but in various directions depending on the number of intersecting discharge papers. Therefore, even if a load is applied in one direction, the discharge function of the discharge paper is preserved without being hindered. Further, since the number of conductive fibers protruding to the surface of the paper increases by the number of intersecting discharge papers, the air discharge function of the sheet also increases, and the static electricity is discharged more efficiently in the air.

In the antistatic sheet according to the second aspect, since the conductive powder is contained in the adhesive for adhering the discharge papers intersecting with each other, the electroconductivity is correspondingly high, and a higher static electricity removing function is provided. have.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an antistatic sheet of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the antistatic sheet of the present invention.

FIG. 3 is an assembled perspective view in which discharge paper is cross-bonded and a base cloth is to be bonded thereto.

FIG. 4 is an enlarged cross-sectional view showing a state in which the three persons shown in FIG. 3 are joined.

FIG. 5 is an enlarged cross-sectional view showing a state in which a pile is driven in a state in which a base cloth is joined to discharge paper.

FIG. 6 is an enlarged cross-sectional view showing a main part of a conventional antistatic sheet.

[Explanation of symbols]

 12 ... Base cloth 13 ... Discharge paper 16 ... Pile

Claims (2)

[Claims] 1. A discharge paper formed by adding conductive fibers to make paper, and a part of the conductive fibers protruding from the paper surface, a base cloth joined to the discharge paper, and a discharge from the base cloth side. In an antistatic sheet provided with a pile containing conductive fibers that is punched into a substantially U-shape while penetrating to the paper side, at least two discharge papers are crossed and adhered to each other. And anti-static sheet. 2. The antistatic sheet according to claim 1, wherein the adhesive for adhering the at least two sheets of discharge paper contains conductive powder.