JPH11117185A - Sheet for printing and printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject sheet exhibiting, e.g. antistatic, electromagnetic wave shielding, surface heating and far-infrared ray radiating functions by laminating a sheet of paper containing electroconductive, extremely fine, short fibers with a printable sheet on one or both sides to form a monolithic body. SOLUTION: This sheet for printing, exhibiting a static electricity neutralization characteristic of at least 90% and electromagnetic wave shielding characteristic of at least 30 dB, is obtained by laminating a sheet of paper with a printable sheet, e.g. high-quality paper for printing, on one or both sides to form a monolithic body, wherein the base sheet is produced by a wet paper-making process with pulp slurry containing 0.2 to 50 wt.% of electroconductive, extremely fine, short fibers, composed of carbon and/or metallic fibers, having a fineness of 0.5 to 3 deniers and length of 0.5 to 25 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for neutralizing static electricity, shielding electromagnetic waves, generating surface heat,
The present invention relates to a printing sheet and a printed material having far-infrared radiation characteristics and exhibiting the characteristics depending on the application.

[0002]

2. Description of the Related Art Heretofore, a printed matter has only a color, pattern, pattern, or the like expressed on a plane, and no special physical characteristics or functions have been imparted to the printed matter.

[0003] For example, there was printing on a metal plate, but it was used as a container for alcoholic beverages, food, and industrial supplies. Also,
There were prints on paper and film, but posters and books that simply displayed.

[0004]

SUMMARY OF THE INVENTION The present invention has characteristics of static electricity neutralization, electromagnetic wave shielding, surface heat generation, and far-infrared radiation, and can be applied to various applications and can be used in various fields. The purpose of the present invention is to provide a printing sheet and printed matter.

[0005]

The objects of the present invention are as follows: (1) Fineness: 0.5 to 3 denier, length: 0.5 to 25 mm
A printable sheet is laminated on one or both sides of paper obtained by a wet papermaking method in which conductive ultra-short fibers made of carbon fibers and / or metal fibers are mixed in a range of 0.2 to 50% by weight. A printing sheet characterized by the above-mentioned.

(2) having an electrostatic neutralization property of 90% or more;
The printing sheet according to the above (1), wherein the printing sheet has an electromagnetic wave shielding property of 30 db or more.

[0007] (3) A printed matter, wherein the printing surface of the printing sheet according to (1) or (2) is printed. Can be achieved by:

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a method for preparing a conductive fiber made of carbon fiber and / or metal fiber having a fineness of 0.5 to 3 denier and a length of 0.5 to 25 mm by 0.2 to 50% by weight. % Of paper obtained by a wet papermaking method mixed in a range of 1% or 1%, and a printable sheet laminated on one side or both sides.

With the above-described structure, the properties of neutralization of static electricity, electromagnetic wave shielding, surface heat generation, and far-infrared radiation can be imparted to the printing sheet and the printed matter.

The reason why the electrostatic neutralization phenomenon can be imparted is as follows. In other words, the conductive ultra-fine short fiber has its tip exposed on the surface of the paper and plays the role of an antenna. It collects charged substances and ions opposite to the generated static electricity from the air, causes a neutralization phenomenon, and attenuates the static electricity. You can do it.

Here, the neutralization phenomenon means that (1) the presence of a charged substance, (2) the opposite ions are collected at the tip of the conductive ultra-fine short fiber, and (3) the positive and negative ions are neutralized. And (4)
This is a physical phenomenon in which charging is attenuated.

The neutralizing property of 90% or more is measured by the following measuring method. (a) The charge amount of the charged material is measured with a static electricity meter manufactured by Shisido Electric Co., Ltd. (b) The paper of the present invention is brought into contact with the charged material for 5 seconds. (c) Measure the charge amount of the charged material thereafter. The charge amount is 10
When the voltage became 00 V or less, it was determined that the electrostatic neutralization property was 90% or more.

The reason why the electromagnetic wave shielding property can be provided is as follows. Since the conductive microfibers contained in the paper of the present invention are uniformly dispersed, when electromagnetic waves are incident on the paper, most of the reflected energy is transmitted, but a part of the reflected energy is transmitted and internally repeated. It prevents reflection by repeating reflection and loss, and shields electromagnetic waves.

Here, the electromagnetic wave shield (1) shields the electric field portion of the electromagnetic wave to 90% or more, and (2) the conductive ultra-fine short fibers contained in the paper diffusely reflect the electromagnetic wave to prevent the passage of the electromagnetic wave. Block.

The electromagnetic wave shield is obtained by the following measuring method.
Measured. (a) Measure using an electromagnetic shield evaluator manufactured by Advantest Corporation. (b) As shown in FIGS. 4 and 5, in the paper of the present invention, 3
It has a shielding property of 0 dB (db) or more (99.9% shielding rate).
FIG. 5 is a chart showing the relationship between b and the wavelength, and FIG. 5 is a chart showing the relationship between the wavelength measured in the vertical direction of the paper and db).

The reason why surface heat can be applied is as follows. When a direct current is passed through the paper of the present invention, there is a portion where the contacts of the conductive fibers are continuous and the whole is a semiconductor, so that the entire surface immediately generates heat. Voltage,
The temperature can be adjusted according to the magnitude of the current.

Here, surface heat generation means (1) when electricity is passed through paper, (2) paper, which is a semiconductor, generates heat, and (3) voltage and current are reduced to a temperature of about 60 ° C. or less. I do.

The reason why far-infrared radiation characteristics can be imparted is as follows. Here, far-infrared radiation means (1) when electricity is passed through paper, (2) paper, which is a semiconductor, generates heat, and (3) voltage and current are reduced to a temperature of about 60 ° C. or less. (4) 90% or more of far infrared rays are radiated by heat generation.

The far-infrared radiation is measured by the following measuring method. (a) The color of the temperature distribution is determined using a non-contact temperature distribution measuring device manufactured by JEOL Ltd. (b) Attach copper foil to both ends of the sample, and apply DC current 1A, 8
V is energized. (c) As shown in FIG. 3, a far infrared ray tape (97% radiation level) 6 manufactured by OPTEC was mounted on paper, and it was confirmed that 97% far infrared rays were radiated by the same color due to heat generation. .

The conductive ultra-fine short fibers include PAN
Metal fibers such as system-based (polyacrylonitrile-based) carbon fibers, pitch-based carbon fibers, metal fibers, metal-plated fibers, or a mixture of these fibers can be used.

It is preferable that the conductive ultra-fine short fiber be as thin as possible, and the fiber length be as long as possible because it is easier to collect ions. Specifically, the fineness is 0.5 to
Those having a denier of 3 and a length in the range of 0.5 to 25 mm are preferably applicable.

If the fineness is smaller than 0.5 denier, the strength is low and the cost is high. If the fineness is larger than 3 denier, the ion gathering power becomes small, which is not preferable. On the other hand, if the fiber length is shorter than 0.5 mm, the ion aggregating force becomes small,
If it is longer than mm, it is unfavorably disturbed in paper and disperses poorly.

The present invention is made of paper containing the above-mentioned conductive ultra-short fibers in an amount of 0.2 to 50% by weight based on the whole. If the amount of the conductive ultrafine short fibers is less than 0.2% by weight based on the whole, the effects intended by the present invention cannot be obtained. Also,
If it exceeds 50% by weight, the material cost becomes high and the paper making becomes difficult.

When the conductive fiber is made of carbon fiber, the carbon fiber accounts for 30% by weight or more, more preferably 40% by weight.
Preferably, it has the above. If the amount is less than 30% by weight, the shielding property is lower than 30 db, which is not preferable.

When the conductive fibers are composed of carbon fibers and metal fibers, the metal fibers preferably have a content of 0.2 to 20% by weight. In this case, it is preferable that the carbon fiber has 20% by weight or more. When the content of the metal fiber is less than 0.2% by weight, the shielding property is lowered, which is not preferable. Also, 2
If the content exceeds 0% by weight, the dispersibility becomes poor due to precipitation of the metal fibers, and the productivity of paper is lowered, which is not preferable.

The above-mentioned conductive ultrafine short fibers can be obtained by making a paper by a wet papermaking method using a mixed material containing wood pulp and a binder. In addition to the above, it is also possible to include short fibers of synthetic fibers such as polyester, nylon, and acryl as necessary. In making the paper, it is preferable that the heating and pressurization that hinder the protrusion of the conductive ultra-fine short fiber be not performed, and the paper be formed such that many tips protrude.

Further, it is preferable that the paper is formed in a state where the conductive ultrafine fibers are uniformly dispersed.
In order to uniformly disperse the conductive ultrafine fibers, it can be obtained, for example, by using a beater for 1.5 times or more as compared with paper of 100% pulp.

As described above, in order to impart surface heating and far-infrared radiation characteristics, copper foil or the like may be placed at any position on the paper mixed with the conductive ultra-short fibers, for example, at both ends of the paper. Attach metal foil. When a direct current is passed through the electrodes, the entire surface is uniformly heated because the entire paper is a semiconductor.

According to the present invention, printable sheets are laminated on one side or both sides of the paper obtained by the above-mentioned wet papermaking method, and laminated with an adhesive or the like. As the printable sheet, paper, a synthetic resin film, cloth, or the like can be used.

In the present invention, a printed material is obtained by performing offset printing, gravure printing, inkjet printing, or the like on the printable sheet surface.

With this printed matter, for example, even if it comes into contact with a knob of a car, static electricity is neutralized and no electric shock is applied. Also, if it is enclosed and shielded by printed matter, it does not receive electromagnetic waves. In addition, if a temperature-sensitive color-changing ink that changes color depending on temperature is used, the printed material changes color depending on the temperature, and for example, can be a printed material whose color changes depending on whether or not current is passed through a poster or the like. Also, if an electric current is passed through this printed matter, it has a far-infrared radiation effect.

FIG. 1 is a side view showing an example of the printing sheet according to the present invention, and FIG. 2 is a top view showing another example of the printing sheet according to the present invention. The printing sheet of the present invention may be wound into a roll so as to enable continuous printing, or may be a sheet-like sheet.

In FIG. 1, reference numeral 4 denotes paper mixed with conductive ultra-fine short fibers 3, wherein a printable sheet 1 is bonded to one side of the paper 4 via an adhesive binder 2.

FIG. 2 shows an example in which electrodes 5 made of copper foil are provided at both ends of the printing sheet 1. By passing a DC current through the electrodes, the semiconductor paper 4 generates heat. It has become. FIG. 3 shows the printing sheet of FIG. 2 with a far infrared tape 6 attached. FIG.
FIG. 3 is a chart showing the electromagnetic wave shielding properties of the paper of the present invention.

[0035]

【Example】

[Example 1] A PAN-based carbon fiber (polyacrylonitrile-based) having a fineness of 0.8 denier was cut into 6 mm, and a weight ratio of 40% was mixed with paper pulp to produce a paper in which carbon fibers were uniformly dispersed. did. This paper was laminated with high-quality printing paper (white) to form a composite printing sheet, and offset printing was performed on the high-quality printing paper to form a pocket card. When the driver touched the card with the door handle when getting in or out of the car and touching it, the shock was completely prevented.

[Second Embodiment] The necessary telephone number of the mobile phone is printed on the paper manufactured in the first embodiment, folded in multiple stages, and can be compactly stored in a folded state in a telephone storage case so that it can be carried together with the telephone. Then, when the telephone was spread and used and the paper of the present invention was interposed between the ear and the telephone, the electromagnetic wave generated from the mobile telephone was cut off by 99%, and the electromagnetic interference was reduced.

Example 3 A poster on which characters and patterns were printed with the thermochromic ink on the paper manufactured in Example 1 was prepared. As shown in FIG. 2, a pair of copper foil tapes were attached to both ends to form electrodes, and a direct current of 8 V and 1 A was applied. The poster was uniformly heated to a temperature of 45 ° C., and the thermochromic ink changed color. When the current was turned off, the poster returned to its original color.

[0038]

The printed matter according to the present invention can sufficiently function as a pocket card, a wall material, a personal computer separator, etc. having the property of neutralizing static electricity and shielding electromagnetic waves.

A printed matter according to the present invention laminated with a printable sheet, for example, a hand-printed poster laminated with a printable fabric, has a surface heating element and far-infrared radiation characteristics when energized.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an example of a printing sheet according to the present invention.

FIG. 2 is a top view showing another example of the printing sheet according to the present invention.

FIG. 3 shows the printing sheet of FIG. 2 to which a far-infrared infrared tape 6 is attached.

FIG. 4 shows the electromagnetic wave shielding property of the paper of the present invention,
4 is a chart showing a relationship between a wavelength measured in the horizontal direction of paper and db.

FIG. 5 shows the electromagnetic wave shielding property of the paper of the present invention,
It is a chart chart which shows the relationship between the wavelength measured in the paper vertical direction, and db.

[Explanation of symbols]

 1: paper mixed with conductive ultrafine fibers 2: printable sheet 3: conductive ultrafine fibers 4: adhesive binder 5: electrode 6: far infrared tape

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Oishi 2- 354 Kokubu, Otsu-shi, Shiga Prefecture Inside Oishi Corporation (72) Inventor Shuji Okabe 1-18-26 Kaminishi, Hirano-ku, Osaka-shi Within Okabe Metal Co., Ltd.

Claims (3)

[Claims] 1. A fineness of 0.5 to 3 denier and a length of 0.5 to 2
A printable sheet is laminated on one or both sides of paper obtained by a wet papermaking method in which conductive ultra-short fibers made of 5 mm carbon fiber and / or metal fiber are mixed in a range of 0.2 to 50% by weight. A sheet for printing. 2. The printing sheet according to claim 1, wherein the sheet has an electrostatic neutralizing property of 90% or more and an electromagnetic wave shielding property of 30 db or more. 3. A printed matter, wherein the printed surface of the printing sheet according to claim 1 is printed.