JPH0321677B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This application is particularly applicable to work at high places such as mountain climbing, electrical equipment work including live wire work on poles, chemical factory equipment work, etc., or when evacuation from a building fire. It relates to a rope that is used as a lifeline or a transportation line.

Conventional Technology Conventionally, ropes have been used as life lines or access lines when working at high places, such as mountain climbing, electrical equipment work including live wire work on poles, or chemical factory equipment work, or when evacuating from a building fire. Generally made from natural fibers such as cotton or linen,
This rope made from natural fibers has a moisture content of 5-10%.
Therefore, in the case of natural fibers, there is no risk of static electricity being generated due to the water content, but they have a high specific gravity, and if they contain a lot of water, they become hard and difficult to handle, and they also have poor strength and durability. The flaws were that the quality was low and the price was high.

Therefore, ropes made of man-made fibers such as polypropylene, polyester, polyamide or polyaramid are widely used today.

Problems to be Solved by the Invention However, in the case of ropes made of the above-mentioned man-made fibers, static electricity is easily charged, and therefore, when the rope is charged with static electricity due to friction etc., and the amount of static electricity reaches a certain limit, the static electricity It releases energy and gives an electric shock to the user using the rope, which may cause a risk of falling or causing objects to fall, especially when working at heights with unstable footing. The current situation is that related industries are struggling to come up with measures to improve the situation.

Means for Solving the Problems Therefore, the present application provides an antistatic paper in which the short fibers obtained by paper-making carbon fiber short fibers together with wood pulp, natural fibers, or artificial fibers are dispersed and the tips protrude in a flocked manner. It is characterized by being made narrow and incorporated into a rope made of artificial fibers, and preferably the short fibers have a length of 1 to 15 mm and the antistatic paper has a width of 5 to 20 mm.

Further, the present application is characterized in that an antistatic spun yarn made of short fibers obtained by blending short fibers made of carbon fibers and whose tips protrude in a flocked manner is incorporated into a rope made of artificial fibers. Preferably, the short fibers have a length of 38 to 150 mm.

Function: Antistatic paper or antistatic spun yarn is then incorporated into a core of known man-made fibers to create, for example, a three-braid rope.

When the rope constructed in this way is charged with static electricity due to friction or the like during handling, the static electricity is discharged to the outside air from the tips of the short fibers protruding in a flocked manner.

Example 1 8% by weight of 1.5d/15mm short fibers made of pitch-based oxygen fibers were mixed with 60% by weight of American cotton, 20% by weight of wood pulp, and 12% of binder, and this mixture was milled using a beating machine. After further cutting to make a uniform mixture, wet papermaking method is used to
Antistatic paper with a basis weight of 35 g/m ² was produced.

When we tested the performance of this antistatic paper, we found that its half-life was 20 seconds, the frictional charging voltage was 25V, and the surface leakage resistance was less than 1.5 x 10 ⁶ Ω. It was confirmed that it can be neutralized by air discharge.

The above-mentioned antistatic paper 1 is cut into a narrow width of 5 to 20 mm, and then twisted into the core of a polyaramid fiber rope 2 using a known rope manufacturing machine to form three desired pieces as shown in the figure. Created a rope.

When the rope created above was rubbed 20 times with a 100% polyester fabric, it was confirmed that static electricity was generated at 350V, which is much lower than the 3000V voltage at which the human body feels an electric shock.

2. Create an antistatic spun yarn by aligning 10% by weight short fibers of PAN carbon fiber with a length of 3D/76mm and the tips of the PAN carbon fibers in parallel, then spinning them.
When we tested the performance of the electrostatically spun yarn created by this spinning process, we found that its electrostatic properties had a half-life of 56 seconds,
It was confirmed that the frictional charging voltage was 73V, the surface leakage resistance was less than 2×10 ⁵ Ω, and that static electricity of 20,000V was momentarily discharged into the air and neutralized.

Then, this antistatic spun yarn was incorporated one by one into the core of a polypropylene fiber rope using a known rope manufacturing machine to create the desired three-braid rope.

When the rope created above was rubbed 25 times with a 100% polyester fabric, static electricity was generated at 230V, which is much smaller than the 3000V voltage at which the human body feels an electric shock.

In the above, pitch carbon fiber can also be used instead of PAN carbon fiber.

In Examples 1 and 2 above, especially when the short fibers are uniformly dispersed in the antistatic paper or antistatic spun yarn and the tips of the short fibers protrude in a flocked manner, for example, 200 fibers/mm or more, acts as an antenna and discharges static electricity into the air, making it possible to keep static electricity to an extremely low level.

When the surface of a conventional 100% polypropylene rope was rubbed under the same conditions as in the above example, it was charged with 8000V of static electricity.

Effects of the Invention As described above, according to the present application, even if static electricity is charged due to friction during handling, the static electricity is dispersed and discharged from the tips of the conductive short fibers present in a flocked manner. Not only does it have excellent properties and there is no risk of receiving an electric shock due to static electricity as in the case of conventional ropes, but the short fibers do not exist in a continuous conductive state along the length of the rope, so it can be used, for example, when working with live wires on a pole. , even if the rope touches a live wire, there is no risk of causing an electric shock or short-circuit accident, so it can be used at high places such as mountain climbing, electrical equipment work on a pole, or chemical factory equipment work. It is extremely effective, and has the advantage of being easy to manufacture because short fibers are made into antistatic paper by papermaking or are incorporated into a rope made of artificial fibers as antistatic spun yarn by blending.

[Brief explanation of the drawing]

The drawing is a cross-sectional view of an embodiment of the rope of the present application. 1 is antistatic paper or antistatic spun yarn, and 2 is an artificial fiber rope.

Claims (1)

[Scope of Claims] 1. Antistatic paper made of carbon fiber short fibers, wood pulp, natural fibers, or artificial fibers, dispersed in paper, and whose ends protrude in a flocked manner, is made into a narrow width. A working rope characterized by being incorporated into a rope made of artificial fibers. 2. The working rope according to claim 1, wherein the short fibers have a length of 1 to 15 mm, and the antistatic paper has a width of 5 to 20 mm. 3. A working product characterized by incorporating an antistatic spun yarn, which is obtained by blending short fibers made of carbon fibers and whose tips are protruded in a flocked manner, into a rope made of artificial fibers. rope. 4. Claim 3, wherein the short fibers have a length of 38 to 150 mm.
Work rope as described.