JPS6140147A - Conductive sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Application Field The present invention relates to a conductive sheet used for electrostatic shielding of ICs, LSIs, etc., for example.

In this invention, the term "sheet" is used to include a film.

(2) Prior art Conventionally, this type of conductive sheet was developed in Japanese Patent Application Laid-Open No. 58-15
There is one shown in No. 5917.

This is made by laminating a conductive fiber layer on the surface of a base sheet.

However, since the conductive sheet having the above structure has a conductive fiber layer on the surface, the conductive fibers on the surface become fluffed and cause failures in ICs, LSIs, etc. during use.

Further, the conductive fiber layer of the conductive sheet is made the inner surface,
When a bag is formed to store ICs, LSIs, etc. and shielded from external static electricity, the ICs stored in the bag come into direct contact with conductive fibers, so static electricity is
There was a problem that conduction occurred through C etc., damaging ICs etc.

(3) Problems to be solved by the invention This invention aims to provide a conductive sheet that does not fuzz even after long-term use and has a structure that does not easily conduct electricity to stored items when shielded from external static electricity. It is.

(4) Means for Solving the Problems In order to solve the above problems, the present invention comprises laminating a conductive edge l# layer on the surface of the base sheet! In the conductive sheet, a synthetic resin covering layer is laminated on the surface of the conductive fiber layer, and a large number of holes are bored in the covering layer to reach the conductive fiber layer.

(5) Effect The coating layer on the surface of the conductive fiber layer includes conductive fibers.
A large number of holes reaching up to . -Also, even if a bag is formed using the conductive sheet of the present invention, and the conductive fiber layer is located on the inner surface, the synthetic resin coating 1- is on the surface of the conductive fiber layer. Since they are laminated, this covering layer prevents the stored items from coming into direct contact with the conductive fiber layer. Therefore, even when external static electricity is shielded by the conductive fiber layer, static electricity is not conducted to the stored items.

(6) Examples An embodiment of the present invention will be described based on the accompanying drawings.

The conductive sheet 1 of the present invention has conductive fibers @3 laminated on the surface of a base sheet 2, a synthetic resin coating layer 4 laminated on the surface of the conductive fiber layer 3, and the coating layer 4 described above. A large number of holes 5 are formed to reach the conductive fiber layer 3.

As the base sheet 2, a plastic sheet or film, a nonwoven fabric, cloth, paper, or a laminate of one or more of these can be used.

In addition, the conductive fibers forming the conductive fiber @3 are as follows:
Examples include copper-adsorbing fibers, metal-plated fibers, carbon composite fibers, metal-deposited fibers, and thin metal wires.

Examples of the synthetic resin forming the coating layer 4 include polypropylene and polyethylene.

Examples of methods for laminating the base sheet 2, conductive fiber layer 3, and coating layer 4 are as follows.

As one example, as shown in FIG.
A thermoplastic resin 6 such as polyethylene or polypropylene is extruded and laminated by an extruder 7 between the conductive fiber material 3' and a sheet-like conductive fiber material 3' to form a laminate 8, and the surface of the laminate 8 is coated with polypropylene or polyethylene. A coating layer 4 is formed by extruding and laminating synthetic resins such as
There is a method in which the coating layer 4 is formed and then the coating layer 4 is embossed to form holes 5 that reach the conductive #a fiber material 3. The above-mentioned coating @4 can also be formed by dry laminating the above-mentioned laminate material No. 8 with a film made of polypropylene or the like.

Also, as shown in Figure S3, by overlapping the base sheet 2 and the sheet-shaped conductive fiber material 3, and extruding and laminating the synthetic resin on the surface of the conductive fiber material 3 using an extruder 10. There is a method in which a synthetic resin coating layer 4 is formed on the surface of the conductive fiber material 3 at the same time as the base sheet 2 and the conductive fiber material 3 are bonded together, and then this material is embossed.

Further, as shown in FIG. 4, a sheet-shaped conductive fiber material 3
is sandwiched between the base sheet 2 and the synthetic resin film 4 forming the W layer 4, passed through a hot roll 11 for heat fusion, and then embossed. There is also a way to do it at the same time as wearing it. Alternatively, holes 5 may be made in advance in the synthetic resin film 4.
Wear.

Various shapes can be considered for the embossing roll used in the embossing process, but the shape should be such that the minute holes are formed as closely as possible.

In addition to the above-mentioned embossing process, the means for forming the holes 5 in the coating @ 4 include cutting only the coating layer 4 with a roll having a large number of cutting blades on the circumferential surface to form a large number of holes 5. You can also do this.

In addition, when performing the above embossing process, the temperature of the embossing roll is 80 to 180°C, and the pressure is 0.3 to 5.0K.
f/a4 is desirable.

(7) Effects As described above, the conductive sheet of the present invention has a covering layer with a large number of holes on the surface of the sheet of the conductive fiber layer, so it has antistatic properties and the conductive fiber layer has antistatic properties. The effect is that there is no fluff.

In addition, since there is a synthetic resin coating layer on the surface of the conductive fiber layer, it is easy to form a bag by heat-sealing, etc. Also, when shielding external static electricity with this coating 1-, the stored items can be protected from static electricity. There is also the effect that there is no conduction.

[Brief explanation of drawings]

FIG. 1 is an enlarged perspective view showing one embodiment of the conductive sheet of the present invention, and FIGS. 2 to 4 are schematic diagrams showing the manufacturing process of the conductive sheet, respectively. Patent applicant: Taika Kogyo Co., Ltd. Agent: Kama 1) Text 2 Figure 2 Figure 3 Figure 4 Figure 4'

Claims (1)

[Claims] In a conductive sheet formed by laminating a conductive fiber layer on the surface of a base sheet, a synthetic resin coating layer is laminated on the surface of the conductive fiber layer, and a plurality of layers reaching the conductive fiber layer are laminated on the surface of the conductive fiber layer. A conductive sheet characterized by having holes formed therein.