JPS6349008A - Cutter cord of rotary reaper - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cutter cord made of synthetic resin monofilament and used as a rotary blade of a rotary brush cutter for cutting grass and weeds.

(Prior art) Brush cutters are used for cutting lawn grass in general households, cutting grass on ranches,
It is widely used for a variety of purposes, such as cutting weeds on farms and footpaths, and cutting weeds on roads and river embankments.

Traditionally, the type of brush cutter that has been most commonly used is one that uses a metal saw-shaped rotary blade that rotates at high speed and cuts the grass by applying it to the grass. has an extremely good ability to cut grass, but if the rotating metal blade hits a block of stone or concrete during work, a portion of the blade will break, and the broken blade and stone fragments will scatter. Contains a risk of injury to workers. In addition, when using a rotary blade with a metal rotary blade to cut grass around stone walls, stepping stones, shrubbery, etc., the rotary blade may be damaged by these obstacles, or the roots of the shrubbery may be damaged. It was difficult to perform efficient work such as cutting.

Recently, a cutter cord made of synthetic resin monofilament has been developed as a rotary blade that is safe and does not damage plants, solving this problem, and is especially useful for cleaning places that are difficult to clean with metal rotary blades such as those mentioned above. used as a target.

In other words, this type of rotary brush cutter attaches one or more synthetic resin monofilament cutter cords approximately 10 to 20 cm in length to a rotating body made of metal or plastic, and rotates the cord at high speed to cut grass, etc. The mowing work is done by blowing away the grass.

In this type of Kaributsuden, the monofilament wears out or breaks during use and is consumed, so a method of replenishing the monofilament was devised, and a long monofilament wound into a cord shape on a cassette reel was rotated. By attaching it to an object, pulling out the tip of the monofilament as needed, and pulling out the tip of the monofilament from the cassette reel depending on the degree of wear, monofilament can be replenished easily and quickly.

(Problems to be Solved by the Present Invention) However, in the conventional brush cutter using the synthetic resin monofilament cutter cord described above, when the tip of the brush cutter hits thick-stemmed weeds, trees, the ground, stone blocks, etc. As the rotation suddenly decreases and a shocking load is applied to the cutter cord, the monofilament cord inside the cassette reel is momentarily and strongly pulled, causing the monofilament cords being wound and stacked to generate heat due to friction, causing them to mutually This often results in the problem of melt adhesion.

If the monofilament cord is melted and bonded within the cassette reel as described above, it becomes impossible to pull out the monofilament cord from the cassette reel.
All the cutter cords have to be replaced with new ones, which is economically disadvantageous.

The present invention was achieved as a result of studies aimed at solving the problems of conventional brush cutters using synthetic resin monofilament cutter cords as described above.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a monofilament cutter cord for a rotary brush cutter, which does not melt and adhere to each other in a cassette reel even when an impact load is applied, and has improved durability. There is a particular thing.

(Means for Solving the Problems) That is, the gist of the present invention is a cutter cord for a rotary betsubutsuden, which is characterized by having white carbon adhered to the surface of a synthetic resin monofilament. .

The synthetic resin monofilaments used in the present invention include nylon 6, nylon 66, nylon 6101 nylon 612
, polyamides such as nylon 11 and nylon 12,
Polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyolefins such as polyethylene and polypropylene, polyhalogenated hydrocarbons such as polyvinylidene chloride and polyvinylidene fluoride, polyethers such as polyoxymethylene, and copolymers based on these Fiber-forming small aggregates such as fibers and polymer blends are melt-spun using a conventional method, and stretched as necessary.
It means a heat-set yarn with a diameter of 0.5 to 4.0 m.

Among the above-mentioned polymers, polyamide polymers are particularly preferred from the viewpoint of monofilament toughness and spinnability.

Further, the synthetic resin monofilament described above may contain conventional additives such as plasticizers, lubricants, heat-resistant agents, light-resistant agents, weather-resistant agents, antistatic agents, pigments, and dyes.

On the other hand, the white carbon used in the present invention is produced by a method such as firing a silicon compound such as sodium silicate, and is extremely fine colloidal silica with a particle size of about 0.03 μm.

In the present invention, the method for applying white carbon to the surface of the synthetic resin monofilament includes a liquid composition in which white carbon is dispersed in water (colloidal silica) or a liquid composition in which white carbon is dispersed in a film-forming polymer emulsion or solution. Examples include a method in which this is applied to a synthetic resin monofilament by a method such as a dipping method, a liquid film contact method, or a spraying method, followed by air drying or forced drying. Note that the concentration of white carbon in the liquid composition is preferably about 0.1 to 2 Offl%.

The cutter cord of the present invention thus formed is used by winding it around a cassette reel, attaching it to the main body of a rotary brush cutter, and pulling it out to a required length to form a rotary blade.

The cutter cord of the present invention does not cause friction within the cassette reel even when an instantaneous impact load is applied to the tip of the rotating blade, and melt adhesion within the cassette reel is effectively prevented. , replenishment from the cassette reel can always be performed stably.

(Function of the Invention) Although it is not clear why the cutter cord of the brush cutter of the present invention has the above-mentioned effects, the addition of white carbon increases the frictional force between the monofilaments, causing the monofilaments to undergo instantaneous impact. Even if it is pulled, it will not slip and will not generate frictional heat, and even if it slips, the white carbon fine particles will act as a buffer and release agent, preventing heat generation and melting. This is thought to be due to this.

The effects of the present invention will be explained in further detail with reference to Examples below.

(Example) Nylon 6 with a relative viscosity of 4.2 measured using 98% concentrated sulfuric acid as a solvent, 7% ε-caprolactam as a softener, and 0.3% ethylene bisstearylamide as a lubricant. The composition to which % of the weight was added was melt-spun at a temperature of 260°C, cooled and solidified in a 20°C cooling water bath, and then drawn 4 times in a 95°C hot water bath to form a drawn monofilament with a diameter of 2#. I got it.

On the other hand, colloidal silica ("Snowtex" O5i020% manufactured by Nissan Chemical ■) was diluted with pure water to prepare emulsion compositions with different active ingredients as shown in Table 1. After infiltrating the polyamide monofilament, the polyamide monofilament was air-dried to obtain a polyamide monofilament whose surface was coated with white carbon.

For the seven types of polyamide monofilaments obtained in this way, the thread-system friction force was measured, and the melt adhesion state when attached to a brush cutter as a cutter cord and subjected to a practical test was 1! The results are also shown in Table 1.

Furthermore, the frictional force between the monofilament thread and the system is 10 cm long.
m, one filament sample was placed in the center, and six monofilament samples with a length of 5 cm were bundled around it.
Binding band (2 light crude material “C0NVEX” CV-io
o) For a product tied using two wires, calculate the force that pulls the center one to the center using Rotsu Seisakusho (II) M Autograph DSC.
-2000 at a speed of 300 m/min, and the load at the initial inflection point of the load-time curve was read as the frictional force.

In addition, the practical test of the cutting blade was ■Tegaru Pa SRM manufactured by Kyoritsu.
-141F type (rotation speed 850ORPM> dedicated cassette reel, monofilament cutter cord 3mW)
I then pulled out the 15cm tip from the cassette to use it as a rotary blade, and when I was operating this brush cutter to cut away the base of a tree with a diameter of approximately 3cm, the rotation of the rotary blade suddenly decreased. Remove the brush cutter from the tree, and once the rotational speed has recovered, repeat the process of cutting the tree away again until the monofilament rotary blade breaks at the root. After that, remove the cassette reel and check the state of the melted bond between the monofilaments. The following evaluations were made through observation.

○... No melt adhesion occurs at all △... There is a slight melt adhesion, but it can be separated with weak force X... Melt adhesion occurs hotly Table-1 It is clear from the results in Table-1 For example, the cutter cord of a conventional rotary brush cutter that does not have white carbon added (
When an instantaneous impact load is applied to the rotary blade, melt adhesion within the cassette reel occurs significantly. ~7) is
There is no melting and adhesion within the cassette reel, and it is always easy to pull out and replenish the cassette reel.

(Effects of the Invention) As explained above, the cutter cord of the rotary brush cutter of the present invention does not melt and adhere to each other in the cassette reel even when an impact load is applied, and always maintains a constant force. It can be pulled out and refilled from a cassette reel, and has excellent operability and durability.

Claims (1)

[Claims] A rotary brush cutter cutter cord that is made of synthetic resin monofilament with white carbon adhered to its surface.