JPH034597A - Conductive sheet - Google Patents

Abstract

PURPOSE:To obtain a conductive sheet by a method wherein resin material containing conductive fiber is subjected to an extrusion-laminating processing through the intermediary of water-resistant adhesive agent. CONSTITUTION:Resin material 3' containing conductive fiber is filled into the B tank of a tank 13, and adhesive agent 12 is filled into an A tank. A rolled paper 2' is fed by a roll 10, the adhesive agent 12 and the resin material 3' are dropped from above to be formed into two layers in one piece as thick as prescribed, which is uniformly applied onto the paper 2'. The adhesive agent 12 and the resin material 3' are made to flow out in belt from a nozzle located at the lower end of the tank 13 so as not to be mixed together, the thickness of the resin material and the adhesive agent applied onto the paper 2' can be selected by adjusting the nozzle in diameter, and a heater is provided to the tank 13 to control the temperature of the resin material and the adhesive agent, whereby the adhesive agent 12 can be controlled in viscosity, state of dripping from a nozzle, and spreading state. In succession, a conductive paper 1 is extruded by hot-welding through rollers 15 and 16. The sheet 1 subjected to an extrusion laminating processing is cut into prescribed size and thus a manufacturing process is finished. By this constitution, a conductive sheet rigid, excellent in electrostatic shielding property and water resistance, and free of paper powder can be obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a conductive sheet for preventing static electricity.

[Prior art and its problems] Recently, the applicant of the present application has manufactured and sold a product called "Emisied" (
(registered trademark) and rST Fiber (registered trademark) manufactured and sold by Toyo Fiber Co., Ltd. The former “Emisied” is a highly conductive metal
It has a structure with a conductive layer made of a metal compound adhered to the surface of the paper, and the shielding effect is controlled by the degree of adhesion. Also, the latter rST fiber
The product is made of stainless steel (hereinafter referred to as "stainless steel") fiber-mixed paperboard with an insulating layer on both sides, and has excellent bendability and punching workability.

However, in the conventional example described above, the more you try to obtain a good shielding effect, the more complicated the structure becomes, resulting in higher production costs (also, if you want to obtain a shielding film with excellent water resistance, it is difficult to make it profitable). The disadvantage is that you cannot make a profit.

The present invention has been made in view of the above-mentioned prior art, and its purpose is to provide anti-static prevention with a simple structure, low cost, and water resistance, and to eliminate paper dust that is generated when paper is used as a material. The purpose of the present invention is to provide a conductive sheet that prevents this from occurring.

[Means for Solving the Problems and Their Effects] In order to solve the above-mentioned problems and achieve the objects, the conductive sheet according to the present invention has a resin material containing conductive fibers that absorbs static electricity, The resin member is extruded and laminated with a water-resistant adhesive, making it water resistant.

[Embodiment 1] 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, ■ indicates the conductive sheet of this example. This conductive sheet 1 is a surface 2a of a paper layer 2 serving as a base material.
In addition, a resin material containing conductive fibers (forming the conductive layer 3) is extruded and laminated with a water-resistant and thermosetting adhesive layer 5 interposed therebetween.

The conductive layer 3 has a structure in which a plurality of ultrafine stainless steel fibers 4 are uniformly dispersed in a weight ratio of 3 to 20% in a PE (polyethylene) or PP (polypropylene) resin. Preferably, the weight ratio is 5%. According to this blending amount, a surface electrical resistance of 102 to 104 Ω/mouth can be obtained. In addition, the base material may be a resin film such as PP or PET (polyethylene terephthalate) as a material other than paper.
etc. are suitable.

Here, a method for manufacturing the conductive sheet 1 of this example will be explained.

FIG. 2 is a diagram illustrating the extrusion lamination process of this example.

First, although not shown, the roll paper 2° forming the paper layer 4 is set in a roll shape at a predetermined position. or,
In this embodiment, since extrusion lamination processing is performed using Corami, a storage tank 13 divided into two tanks A and B is used as shown in the figure. One tank B has a conductive layer 3.
The other B tank is filled with a resin material 3° containing conductive fibers to form a conductive fiber, and the other tank B is filled with an adhesive layer for bonding the resin material 3° containing conductive fibers and the roll paper 2°. It is filled with adhesive 12 forming 5.

In the first step, when the roll paper 2° is transported by the paper roll 10, adhesive 1 is applied from above the roll paper 2°.
2 and the resin material 3° are dropped so as to form a predetermined thickness, and the two layers are uniformly coated onto the roll paper 2°. Nozzle 1 provided below the storage tank 13
4, the adhesive 12 and the resin material 3' flow out in a band shape so that they do not mix. Incidentally, each member, that is, the thickness of the adhesive 12 and the resin material 3° applied to the surface of the roll paper 2°, can be selected by adjusting the diameter of the nozzle 14.

Further, by providing a heater device in the storage tank 13, the temperature can be adjusted, thereby controlling the viscosity of the adhesive 12, the degree of falling from the nozzle 14, and the state of extension.

In the next second step, the resin material 3° and the adhesive 3′ are fed between the cooling roll 15 and the backup roll 16 for extrusion lamination in a viscous state on the roll paper 2°. They are pressed together, and at this time, they are thermally welded using the adhesive 12. Then, from between the cooling roll 15 and the backup roll 16, the conductive sheet l before being cut is extruded.

In the subsequent third step, which is not shown, the extruded laminated conductive sheet 1 is cut to a predetermined size and completed.

By bonding them together with an adhesive, a rigid and reinforced conductive sheet is manufactured.

In particular, the resin material 3' is installed in tank B so that the state of the plurality of stainless steel fibers 4 has many contact points between the plurality of adjacent stainless fibers as shown in FIG.
This increases connectivity over a wide range of stainless steel fibers and improves electrical 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.

In the above embodiments, a two-layer conductive sheet consisting of a paper layer and a conductive layer was described, but the present invention is not limited to this. In order to obtain the rigidity of the conductive sheet, it may be composed of multiple (Korami) layers in which a plurality of conductive layers are stacked, or a thin layer (resin layer) of 3 to 6 μm that does not contain conductive fibers may be used as a conductive sheet. It may also be constructed with multiple (korami) layers interposed between the layers and the paper layer.

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. . Even when printing in this manner, the effect of preventing bleeding can be obtained depending on the properties of the adhesive of the adhesive layer 5.

As explained above, according to the above-described embodiments, good static electricity shielding effect and water resistance can be obtained with a simple structure and at low cost. Furthermore, the hardness of the conductive sheet is strengthened by forming the adhesive layer between the base material and the conductive layer. Furthermore, since the resin of the conductive layer 3 contains stainless steel fibers, generation of paper dust is prevented, resulting in cost reduction.

Furthermore, in terms of easy workability and light weight, it is possible to obtain the same functions and effects as the above-mentioned RCPC Emisiade made by the applicant of the present invention. Furthermore, the properties, thickness, etc. of the paper layer can be arbitrarily changed depending on the intended use of the electrically conductive sheet. 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.

Here, an application example of the conductive sheet 1 of this example will be described.

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

FIG. 3A is an external perspective view showing the configuration of a take-up reel for individually packaged embossed tape to which the above-described embodiment is applied;
Figure B is a sectional view taken along line EE in Figure 2A. Here, the take-up reel for individual embossed tape is used to automatically mount antistatic embossed tape (for example, reel diameter Φ310) on electronic equipment by setting it in an automatic electronic component mounting machine. It is a product that is

In FIG. 3A, a paper take-up reel 20 for individually packaged embossed tape is composed of circular double-walled cardboard boxes 21 and 22 that pivotally support a shaft on which an antistatic embossed tape 30 is wound. A conductive layer is provided on the inner liner of each of the double-sided cardboard boxes 21 and 22.

Further, in FIG. 3B showing a cross section of the double-screen cardboard 22, the liner 23 facing inside the double-screen cardboard 22, that is, facing the anti-static embossed tape 30, has a conductive layer of the above-mentioned conductive sheet 1 on its inside surface. Similarly to No. 3, a resinous conductive layer 24 containing stainless steel fibers 25 inside is provided. The liner 23 consists of a conductive layer 24 and a base layer 26 (made by polymerizing multiple sheets of paper) based on the manufacturing method shown in FIG.
(corresponding to the paper layer 2) and an extrusion laminated structure with an adhesive layer 27 interposed therebetween. Note that the above-described conductive sheet 1 may be attached to the inside of the liner corresponding to the position of the liner 23, and in this case, the conductive layer 3 is located on the antistatic embossed tape 30 side.

In addition, in the case of the liner 13 on the double-screen cardboard 12 side,
When the entire double-screen cardboard 12 is 170 to 180 g, the liner weighs 30 g - 1, which accounts for 40 to 60% of the entire liner 13.
The conductive layer 14 of 10 to 20 g may be provided.

According to the above explanation, the electronic components on the antistatic embossed tape can be well protected from electrostatic discharge.
The production cost per take-up reel for individually packaged embossed tape can be mass-produced at low cost.

Although the above-described take-up reel 20 for individually packaged embossed tape is made of paper, the present invention is not limited to this. A conductive sheet can be applied.In this case as well, for example, a two-layer conductive sheet 1 is applied to the innermost surface sandwiching the anti-static embossed tape in the same way as the take-up reel 20 for individually packaged embossed tape. What is necessary is to have a structure in which the conductive layer is attached to the outside. If this is done, the same operation and effect as the above-mentioned take-up reel 1o for individually packaged embossed tape can be obtained.

Further, other application examples of the above-mentioned conductive sheet 1 will also be briefly explained.

Fig. 4 is an external perspective view showing an example of this embodiment applied to a bag, Fig. 5 is an external perspective view showing an example of this embodiment applied to a box, and Fig. 6 is an external perspective view of this embodiment applied to a box. It is an external perspective view showing an example when the example is adapted to a table mat.

When the conductive sheet of this embodiment is used as the five bags 40 as shown in FIG. 4, it is used for transportation or security of printed circuit boards, ICs 1, and other electronic components.

The structure may be any structure in which a conductive layer is provided inside the bag 40.

Further, as shown in FIG. 5, when the conductive sheet of this embodiment is used as a box 50, it has the same uses as the bag 40. Its structure may be any structure as long as it has a conductive sheet provided on the inner liner, similar to the structure of the take-up reel 20 for individually packaged embossed tapes described above.

Furthermore, as shown in FIG. 6, when the conductive sheet of this embodiment is used as table matsuro 0, it may be used by hanging it over a table 70 placed in a place where static electricity is likely to be generated. The side should be in direct contact with the table 70. As for its structure, the above-mentioned conductive sheet may be cut into a rectangular ellipse shape and provided in accordance with the shape of various tables. Similarly to this application, the conductive sheet of this embodiment may be applied as an antistatic material for cabinets, lockers, etc., or as a sheet for preventing static electricity troubles, for various types of office equipment.

Alternatively, if the conductive sheet of this embodiment is to be used as clean room paper, the paper used as the base material of the conductive sheet may be modified in various ways depending on the purpose of the paper.
-20-30% with stainless steel fiber in 6 μm conductive layer
It is sufficient to provide a mixture of inorganic pigments.

Although stainless steel fibers were used as the conductive fibers in the above-mentioned embodiments, the present invention is not limited thereto (e.g., nickel-plated carbon fibers that do not rust or deteriorate, nickel-copper-plated glass fibers, etc.). (Various modifications can be made without departing from the spirit of the present invention.)

[Effects of the Invention] As explained above, according to the present invention, it is possible to exhibit a good static electricity shielding effect even when produced at low cost, and it also does not generate paper dust and has excellent water resistance. It becomes something.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the configuration of an embodiment of the present invention, Fig. 2 is a diagram illustrating extrusion lamination processing of this embodiment, and Fig. 3A is a wrapping for packaging embossed tape to which the above-mentioned embodiment is applied. Fig. 3B is a cross-sectional view taken along line EE in Fig. 2A, Fig. 4 is an external perspective view showing an example of applying this embodiment to a bag, and Fig. 5 is an external perspective view showing the configuration of the take-up reel. FIG. 6 is an external perspective view showing an example of when this embodiment is applied to a box. FIG. 6 is an external perspective view showing an example of when this embodiment is applied to a table mat. In the figure, 1... Conductive sheet, 2... Paper, 2a... Front side, 2b... Back side, 2゛... Roll paper, 3.24...
...Conductive layer 23''...Resin material, 4.25...Stainless steel fiber, 5.27...Adhesive layer, lO...Vapor roll, 12...Adhesive, 13... Storage tank, 1
4... Nozzle, 15... Cooling roll, 16.
... Backup roll, 20... Take-up reel for packaging embossed tape. 21.22... Double-sided cardboard, 23... Liner 26... Base layer, 40.
...Bag, 50...Box, 60...Table mat, 7
0...It is a table.

Claims (1)

[Claims] A conductive sheet for static prevention, characterized by being formed by extrusion laminating a resin material containing conductive fibers on a base material via a water-resistant adhesive. sheet.