JPS62156395A - Static electricity neutralized paper - 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 (Industrial Field of Application) The present invention is applicable to the manufacturing industry of electronic parts, precision electrical machinery, films, paper manufacturing, textiles, etc., the printing industry, the transportation industry, packaging paper for records, etc.
It also relates to Ichikawa's static neutralizing Japanese paper used in electrophotographic copying paper.

Further, the present invention relates to static electricity neutralizing paper that is useful for neutralizing static electricity that has the possibility of causing serious disasters due to ignition of combustible materials, and solving problems related to occupational safety.

(Prior art) Static electricity is easily generated in nonconductors such as synthetic fibers and plastics, and also:
When the electrolyte reaches its limit, electrostatic energy is released and the following phenomenon occurs.

・Secondary disaster caused by electric shock, insulation breakdown of electronic equipment.

・2) Quality problems, workability, and production problems due to the suction of dirt, dust, and objects.

・1) Ignition and explosion of flammable objects due to spark discharge.

In order to prevent static electricity damage as described in 1j11,
It is necessary to quickly reduce the amount of static electricity generated to prevent static electricity from accumulating on objects, which can lead to disasters and failures.

It specifically prevents static electricity damage and has antistatic properties.
As a way to do j-.

・1. ) A method (post-processing method) in which an anti-fog agent is deposited on the surface of the lIj fabric for a period of time.

・A method of coating objects with water-absorbing substances.

(humidification method).

A method of leaking and grounding using a metal wire, etc.

methods have been adopted. However, none of these methods met the requirements in terms of durability, dust adhesion, and city performance.

(Problems to be Solved by the Present Invention) The purpose of the present invention is to address the problems caused by static electricity in various industrial fields, such as failures, reduced efficiency, reduced safety, fires, explosions, and discomfort due to discharged light and sound. The goal is to provide static electricity neutralizing paper that is extremely effective in preventing static electricity.

(Means for Solving the Problems) The object of the present invention described in +iii is to
15 nails 11%, short synthetic fibers 20-70 tons:,
This can be achieved by using static electricity neutralizing paper which is made of >% and the balance is wood pulp, has a hair expiration period of 5 seconds or less, and has a frictional charging voltage of 40V or less.

The unique feature of the static electricity neutralizing paper of the present invention is that, as mentioned above, it contains specific fibers such as short carbon fibers, short synthetic fibers, and wood pulp, and has a half-life of 5 seconds or less. The electrostatic property is that the frictional charging voltage is 40V or less. If the short fiber content of carbon m fibers is less than 3% by hair volume, the desired electrostatic properties cannot be obtained;
If it exceeds Rg%, the electrostatic property improvement effect is saturated and the manufacturing cost increases. The short fiber content of carbon m fiber is 5
-10 weight Φ% is more preferable.

The single fiber fineness of the short ram of the carbon fiber used in the present invention is 1 to
5d, the fiber length is preferably 3 to 6 mm, and preferably has no crimp. In addition, carbon! From the viewpoint of electrostatic properties, it is more preferable to use a fiber made from acrylonitrile polymer fiber.

In the present invention, the short fiber content of the synthetic fiber is 20 to 70 R;
)%, and it is more preferable that the short fiber content of the synthetic fiber is 40~50T<++knee%.
! If it is less than rC%, the paper obtained will be hard and its strength will be reduced, and if it exceeds 73 ton O%, paper-making properties will be reduced. Also,
The width of synthetic m-fiber short fibers is that! It is preferable that the fiber fineness is 1 to 5 d, the fiber length is 3 to 6 mm, and that the material is not crimped. If the m-fiber length exceeds 61 or has crimps, the fibers will become entangled, resulting in poor dispersion and poor papermaking, so it is not preferable, and if the m-fiber length is less than 3 mm, the strength of the paper will deteriorate. This is undesirable because the synthesis u
As the h-fiber, polyester tan is preferred.

In the static electricity neutralizing paper according to the present invention, it is preferable that the tips of the carbon fibers made into the paper protrude above the surface of the paper by 50 wood/ri or more. This is effective for demonstrating the electrostatic properties of

The static electricity neutralizing paper of the present invention has 3 to 1 carbon fiber short fibers.
A mixture consisting of 5% synthetic fibers, 20-7% short fibers of synthetic fibers, and the remaining wood pulp is made into paper using a wet paper-making method to have a basis weight of 50) 7m2 or less, and the short fibers of carbon fibers are uniformly dispersed. It can be obtained by letting

The present invention will be explained in detail with reference to Examples below.

(Example 1) 5% by weight of short mW (ldx61II11) of carbon m fibers produced by a conventional method from acrylonitrile polymer fibers, knowledge of polyethylene terephthalate fibers M1 (ldx
6 mm), 4.5% by weight of wood pulp, 35% by weight of wood pulp and 15% by weight of binder. This mixture was further shredded through a beating machine to obtain a uniform mixture, and then a paper having a basis weight of 25)/Y112 was produced by a wet paper making method.

The electrostatic properties of the obtained paper include a half-life of 0 seconds and a frictional charging voltage of 33
V, surface leakage resistance is 2.5 x 105Ω or less, 500
An IS that instantly discharges static electricity between 0 and 18,000 volts into the air to neutralize it has been created.

(Comparative Example 1) Short m male (3d) (6) of acrylic fiber plated with copper sulfide
mm), 5% by weight of polyethylene terephthalate short fibers (1d x 6m), 45% of wool, wood pulp 35%.
They were mixed at a ratio of 15% by weight and 15% by weight. This mixture was further shredded through a beating machine to obtain a homogeneous mixture, and then a paper having a basis weight of 25)/i was made using a wet paper making method. The electrostatic properties of the obtained paper were reduced by half in 117 seconds;
The friction charging voltage was 51 V, the surface leakage resistance was 3 x 1.06 Ω, and the static neutralization property was inferior to that of the paper obtained in Example 1.

(Comparative Example 2) Using short fibers of iR elementary fibers manufactured from acrylonitrile polymer fibers as a core, a core-sheath type layer of polyethylene terephthalate on the surface (mm<1ax6 mm) was 5% +1:%,
Short fibers of polyethylene terephthalate fiber (ld 76
mm) 45 ton: 6%, wood pulp 35 ton xing% and Pine Gu 15:'5% were mixed. This mixture was further shredded through a beater to obtain a homogeneous mixture, and then paper with a basis weight of 25 g/m2 was produced by a wet paper making method.

The electrostatic properties of the obtained paper include a half-life of 8.6 seconds and a frictional charging voltage of 6.
The paper had a surface leakage resistance of 5V and a surface leakage resistance of 4.8XIOIQΩ, and was inferior to the paper obtained in Example 1 in static electricity neutralization properties.

(Effects of the invention) As mentioned above, static electricity neutralizing paper, which has yet to be invented, can be obtained by limiting the blending amounts of short carbon fibers, short fibers of synthetic fibers, and wood pulp to a specific range, and making the paper uniformly. It has electrostatic properties with a half-life of 5 seconds or less and a frictional charging voltage of 40V or less, and is extremely useful as static electricity neutralizing paper for various types of static electricity prevention IF. The effect of the present invention is that the island component of the antistatic polymer in which carbon black is uniformly dispersed in the synthetic polymer in the metal plating such as copper sulfide and the sea component is distributed in the direction of the fiber axis. This cannot be achieved by using conductive fibers with a striated, dispersed structure or fibers with a core-sheath double-ton structure in which carbon is inserted into the core.

Claims (3)

[Claims] (1) Consists of 3 to 15% by weight of short carbon fibers, 20 to 70% by weight of short synthetic fibers, and the balance wood pulp;
A static electricity neutralizing paper characterized by a half-life of 5 seconds or less and a frictional charging voltage of 40V or less. (2) The short carbon fibers are manufactured from acrylonitrile polymer fibers, have a single fiber fineness of 1 to 5 d, a fiber length of 3 to 6 mm, and have no crimp. Static electricity neutralizing Japanese paper as described in scope item (1). (3) A patent claim in which short carbon fibers are uniformly dispersed, the tips of the short fibers protrude from the surface of the paper at least 50 pieces/cm^2, and the paper basis weight is 50 g/m^2 or less. Static electricity neutralizing Japanese paper as described in scope item (1).