JPH02230609A - Conductive paper - Google Patents

Abstract

PURPOSE:To obtain a conductive paper by arranging multiple contact points between conductive fibers adjacent to each other in a conductive layer, and forming multiple connecting passage for conducting the static electricity. CONSTITUTION:A conductive layer 3 is formed by combinating multiple stainless fibers 4 and a paper 2 in the surface 2a of the paper 2. Multiple contact points are formed between stainless fibers adjacent to each other to raise the connectability in a wide range between the stainless fibers, and the conductivity is improved. With this structure, a conductive layer can be formed with a small quantity of the stainless fiber. The fine shielding effect of the static electricity discharge can be sufficiently obtained with 2-8g/m<2> of the stainless fiber quantity in the conductive layer 3, and the surface resistance value 10<3>ohm/square can be obtained with 4g/m<2> of the stainless fiber quantity. Ni plated carbon fiber or the like which never rust and deteriorate can be used as a conductive fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a conductive paper that shields static electricity.

[Prior art and its problems] In recent years, research and development of shielding films and shielding papers for EMI (electromagnetic interference) have been progressing.

Therefore, one method of imparting conductivity to films and papers is to fill them with conductive fillers. ) is uniformly dispersed to improve conductivity. Another method is to attach metal to the surface of film or paper.

Recently, electrostatic discharge has been taken up as an EMI.
As a shielding paper to prevent this electrostatic discharge, the product name "Emisiade" manufactured and sold by the applicant of this application is
(registered trademark) and "rST Fiber" (registered trademark), a product manufactured and sold by Toyo Fiber Co., Ltd. The former, ``EMISSIEDE,'' has a conductive layer made of highly conductive metals and metal compounds adhered to the surface of the paper, and the shielding effect is controlled by the degree of adhesion. In addition, the latter "rST fiber" is a product with an insulating layer provided on both sides based on stainless steel (hereinafter referred to as "stainless steel") fiber-mixed cardboard, and has excellent bendability and punching workability. .

However, in the conventional example described above, the more a good shielding effect is obtained, the higher the production cost becomes. The disadvantage is that the benefits cannot be obtained.

The present invention has been made in view of the above-mentioned prior art, and its purpose is to provide a conductive paper that can be mass-produced at low cost without reducing the electrostatic discharge shielding effect. .

, [Means for Solving the Problems and Their Effects] In order to solve the above-mentioned problems and achieve the objects, the present invention relates to a conductive paper that has conductive fibers on the surface of the paper by combining with paper. A plurality of contacts are arranged between adjacent conductive fibers in a conductive layer, and the plurality of contacts form a plurality of connection paths that conduct static electricity. The conductive fibers have a good effect of dispersing static electricity over a wide range, and a static electricity shielding effect can be obtained.

[Embodiments] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing the configuration of an embodiment of the present invention.

In FIG. 1, l indicates the conductive paper of this example.
This conductive paper 1 has a structure in which a conductive layer 3 is formed on a surface 2a of a paper 2 serving as a base. The conductive layer 3 is formed by combining a plurality of stainless steel fibers 4 with paper 2. The state of the plurality of stainless steel fibers 4 in this conductive layer 3 is as shown in FIG. This structure has improved conductivity. In this way, by focusing on the wide range of connectivity of stainless steel fibers, a conductive layer can be formed with a smaller amount of stainless steel fibers than in the past.

Here, the amount of stainless steel fiber in the conductive layer 3 is 2 to 8 g/
m" can provide a sufficiently good shielding effect against electrostatic discharge, but if the amount of stainless steel fiber is 4 g/m2, a surface resistance value of 10'Ω/mouth can be obtained.
If the amount of stainless steel fiber is 6 g/m2, the surface resistance value is 1.
0°Ω/mouth can be obtained. Here, the paper-making method for providing the conductive layer 3 (10 to 20 g/m") serving as the top layer may be any ordinary paper-making method. In this case, the amount of stainless steel fiber in the IH is 2 to 8 g/m". Any method that can be used to combine the paper is fine. For example, in the case of cylinder paper, a round cylinder is used for the top layer (conductive H3). Further, in the case of Fourdrinier paper making, a secondary slice can be used, and in the case of the inclined wire mesh method, it is possible to make two layers and provide a top layer (conductive layer 3), but within the scope of the invention. If so, it is not limited to this.

When the conductive paper 1 configured as described above is used, for example, as an electrostatic shielding tissue paper, the standard basis weight is 1.
The above-mentioned conductive layer 3 may be formed on the paper 2 with a density of 3 g/m''.This conductive tissue paper has the function of normal tissues and paper, and also has the function of being able to discharge static electricity, for example. If you carry the above-mentioned tissue bar with you when you leave a room, you will be able to avoid being charged with static electricity from the doorknob.

Also, if you touch a locker or cabinet while it is exposed to electromagnetic waves discharged from an electronic device such as a word processor,
Normally, you would receive a mild electric shock, but if you have the conductive paper of this example, it will absorb static electricity, which will have the effect of preventing EMI from infecting your body. In the above-mentioned embodiment, a two-layer conductive paper consisting of a paper layer and a conductive layer was described, but the present invention is not limited thereto, and may be modified without departing from the spirit of the present invention.
It may also have a structure in which multiple conductive layers are stacked one on top of the other. Furthermore, by using a high-quality paper for the above-mentioned paper 2, the surface 2a on the side of the conductive layer 3 and the back surface 2b opposite to the conductive layer 3 may be provided as printing surfaces, and thereby a wide range of uses can be obtained. .

As explained above, according to the above-mentioned embodiments, it is possible to exhibit a good static electricity shielding effect even when produced at low cost. In addition, in terms of easy workability and light weight, it is possible to obtain the same functions and effects as the above-mentioned ``RCPC Emishied'' by the applicant of the present application. Furthermore, the properties, thickness, etc. of the paper layer can be arbitrarily changed depending on the intended use of the conductive paper. For example, when manufacturing the paper 2, chemical fibers or the like may be added, and strength etc. can be freely set by changing the thickness of the paper.

Next, a preferred example of application of the above-mentioned conductive paper 1 will be explained.

FIG. 2A is an external perspective view showing the configuration of a take-up reel for packaging embossed tape to which the above-described embodiment is applied;
Figure B is a sectional view taken along line E-E in Figure 2A. Here, the take-up reel for packaging embossed tape is a product that is used to automatically mount an antistatic embossed tape (for example, reel diameter Φ310-) on electronic equipment by setting it in an electronic component automatic mounting machine. It is.

In FIG. 2A, a paper packaging embossed tape take-up reel 10 is composed of circular double-sided cardboard boxes 1l and 12 that pivotally support a shaft on which an anti-static embossed tape 20 is wound. It has a structure in which a conductive layer is provided on the inner liner of each of the double-sided cardboard boxes 11 and 12. Further, in FIG. 2B showing a cross section of the double-sided cardboard 12,
The inner liner l3 of the double-sided cardboard 12 has a conductive layer 14 formed on one side, which is similar to the conductive layer 3 of the conductive paper 1 described above, and this configuration has a base layer 15 formed by overlapping multiple sheets of paper. The surface is provided with conductive stainless steel fibers by weaving them together. In the case of the liner 13 on the double-sided cardboard l2 side, assuming that the entire double-sided cardboard 12 is 170 to 180 g, it is sufficient to provide one conductive layer 14 of 10 to 20 g, which is 40 to 60% of the entire 30 g liner l3. .

According to the above explanation, it goes without saying that the electronic components on the antistatic embossed stave are well protected from electrostatic discharge.
Conductive M can be mass-produced at low production cost per take-up reel for packaging embossed tape. Although the above-described take-up reel 10 for packaging embossed tape is made of paper, the present invention is not limited to this.
It can also be applied to take-up reels for packaging embossed staves made of styrofoam. In this case, as well as the take-up reel 10 for packaging embossed tape mentioned above, for example,
The structure may be such that two layers of conductive paper 1 are pasted together with the conductive layer facing outward. In this way, it is possible to obtain the same functions and effects as the take-up reel 10 for packaging embossed stave described above.

In the above embodiment, stainless steel fibers were used as the conductive fibers, but the present invention is not limited to this. Nickel-plated carbon fibers, nickel-copper-plated ballast fibers, etc. that do not rust or deteriorate may also be used. Various modifications may be made without departing from the spirit of the present invention.

[Effects of the Invention] As explained above, according to the present invention, a good static electricity shielding effect can be exhibited even when produced at low cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of an embodiment of the present invention, Fig. 2Δ is an external perspective view showing the structure of a take-up reel for packaging embossed tape to which the above-described embodiment is applied, and Fig. 2B is the 2A It is a sectional view taken along line E-E in the figure. In the figure, l: conductive paper, 2: paper, 2a: surface,
2b... Back surface, 3.14... Conductive layer, 4... Stainless fiber, 5... Contact, 10... Take-up reel for packaging embossed tape, 11, 12... Double-sided Cardboard, 13... liner 15... base layer. Patent applicant: Chuetsu Pulbu Kogyo Co., Ltd., customer agent, patent attorney: Yasunori Otsuka (and one other person): J' et al. Figure 1 Figure 2B

Claims (1)

[Scope of Claims] A conductive paper for electrostatic shielding, comprising a conductive layer made of conductive fibers formed on the surface of the paper by combining with paper, wherein adjacent conductive fibers in the conductive layer 1. A conductive paper, characterized in that a plurality of contact points are arranged between the electrostatic fibers, and the plurality of contact points form a plurality of connection paths that conduct the static electricity.