JPH0372832A - Novel fishing line - Google Patents

Abstract

PURPOSE:To obtain a fine and strong fishing line using a ultrahigh-molecular PE fiber having tensile strength, knot strength, impact strength and elongation of specific value or above and consisting of a flexible high polymer chain and having a good transparency and hardly sensed by a fish when used as a snell. CONSTITUTION:The objective fishing line using a ultra-high molecular PE (preferably having >=500000 weight-average molecular weight) fiber consisting of flexible high polymer chain having at least >=20g/denier, preferably >=30/denier tensile strength, at least >=8g/denier, preferably 12g/denier knot strength, at least >=30g/denier impact strength and >=4% elongation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel fishing line using synthetic fibers made of flexible polymer chains having high strength and high knot strength.

In general, fishing lines are divided into two types: hari line and road line, and the characteristics required for the former are thin and strong (particularly strong knots), moderate stiffness at the waist, fast sinking, and difficulty in seeing underwater. (color, transparency), shrinkage resistance, etc.

The performance required for the latter is long-distance castability, flexibility and ease of winding the reel, light weight of the line, and good hit.
Durability etc. Traditionally, fishing lines have been made of nylon 6, nylon 610, polyester, vinylon, polyhucvinylidene, or the like, depending on the purpose.

The most important characteristics of Harris are that it is thin and strong, and especially has strong knot strength.These characteristics make it difficult for Harris to be detected by fish and able to withstand the weight of large fish. This results in improved performance, with extremely less Harris breakage.

On the other hand, the particularly important characteristics of the thread are that it is thin and strong, and when used as a thread, this characteristic leads to performance such as low resistance to flow and resistance to being washed away by currents, etc. Become.

However, in the case of commercially available Harris threads, the tensile strength of polyfukkavinylidene thread is at most 8 g/d, and even in the case of nylon thread, the tensile strength is 10 g/d for the normal strong type, and even for the high strength type, it is at most 15 g/d. /d, and the actual situation is that no fishing line stronger than this has been obtained.

Recently, high-strength fibers made of aromatic polyamide have been developed, but when this type of fiber is used as fishing line, it has a strength of about 20 g/d, which is perfect in terms of strength, but it has poor impact resistance. It was unsuitable for fishing line, especially for fishing line, due to its low knot strength, yellow coloring of the yarn, and problems with transparency.

Under these circumstances, from a practical standpoint, consumers are demanding fishing lines that are superior to conventional products, particularly lines with high tensile strength and knot strength.

In view of these actual circumstances, the inventors of the present invention have made extensive studies in order to eliminate the drawbacks of the conventional fishing line described above, and as a result, have published Patent Application No. 152261 of 1988 and Patent Application No. 1 of 1988.
Surprisingly, synthetic fibers made of flexible polymers such as polyethylene obtained by the methods described in Patent Application No. 54822 and Patent Application No. 181044 of 1982 have properties not found in conventional fishing lines, namely: By discovering that the fiber has both properties of high strength and high knot strength at the same time, and using this fiber as a fishing line, all of the above-mentioned disadvantages of the conventional fishing line can be eliminated, and a fishing line that is superior to the conventional fishing line can be obtained. They discovered this and arrived at the present invention.

That is, the present invention provides ultra-high molecular weight polymer chains comprising flexible polymer chains having a tensile strength of at least 20 g/denier, a knot strength of at least 8 g/denier, an impact strength of at least 30 g/denier, and an elongation of 4% or more. This is a new fishing line using polyethylene fiber.

The flexible polymer chain referred to in the present invention refers to a molecular chain consisting of molecular bonds that can rotate when subjected to stress or heat, and is a molecule that constitutes wholly aromatic polyamides, wholly aromatic polyesters, etc. The chain is a rigid molecular chain and is not included in the flexible polymer chain molecular chain referred to in the present invention. When polymers containing these rigid molecular chains are oriented in the fiber axis direction, their tensile strength increases, but their impact strength and knot strength tend to decrease. Therefore, it is essential to solve these problems that the synthetic fiber used in the fishing line of the present invention is composed of flexible polymer chains.

The synthetic fiber consisting of flexible polymer chains in the present invention is
Refers to ultra-high molecular weight polyethylene fiber.

The synthetic fiber in the present invention may be monofilament or multifilament, and is not particularly limited.

The fishing line of the present invention is preferably 20g/denier or more, preferably 20g/denier or more.
It is a synthetic fiber made of flexible polymer chains that has a tensile strength of 5 g/denier or more, especially 30 g/denier or more, and a knot strength of 8 g/denier or more, especially 12 g/denier or more, so it is more effective than conventional fishing line. It is thin and strong, has good transparency, and has particularly strong knot strength. When used as Harris thread, it is difficult to be detected by fish, can withstand the weight of large fish, and has extremely low knot breakage. , - When used as a direction thread, it is possible to make the conventional direction thread thinner than 172 mm, so it is flexible and has low resistance to flow.
Therefore, it is difficult to be carried away by currents, etc., and it has properties such as very good hit, probably because the physical properties of the thread are high modulus and high strength. If the tensile strength is less than 20 g/denier, a fishing line that is thinner and stronger than conventional fishing lines cannot be obtained. In addition, in the case where the knot strength is 8 g/denier without grooves, when using Harris, there will be many Harris breakages, which is not very different from the degree of Harris breakage of conventional Harris, which is not preferable.

The synthetic fibers used in the fishing line of the present invention consist of flexible polymer chains and are at least 20 g/denier, preferably 25 g/denier.
It has a tensile strength of denier or more, especially 30 g/denier or more, and a knot strength of 8 g/denier or more, preferably 10 g/denier or more, especially 12 g/denier or more. In particular, those made of ultra-high molecular weight polyethylene with a weight average molecular weight of 500,000 or more are advantageous because they have low raw material costs and are easy to spin. , it has also been found that the Harris breakage is further reduced.

Next, the method for manufacturing the fishing line of the present invention will be briefly explained.

The monofilament, which is an example of the synthetic fiber used in the fishing line of the present invention, is made of, for example, high molecular weight polyethylene having a flexible polymer chain (for example, a weight average molecular weight of I x 10' or more, preferably I x 10' or more). After completely dissolving high molecular weight polyethylene) in a solvent such as decalin, xylene, or paraffin at a temperature below the boiling point of the solvent, the polyethylene solution is completely dissolved in a spinning device at a temperature that does not solidify the polyethylene solution, either in the air at room temperature, in water, or in a hollow space with a cooling device. Extrude into tube. Since the extruded yarn contains a solvent, it is heated in that state to an extent that the yarn does not melt, and then stretched in one stage or in multiple stages so that the total stretching ratio is 10 times or more, preferably 20 times or more. Although it can be obtained by stretching, it is not limited to this method.

If a particularly thick monofilament is to be obtained, a large number of gel fibers containing the solvent extruded from the spinning holes are drawn together and spliced, and the gel fibers are fused and cut using a drawing machine using a hot plate. Monofilament in which gel-like fibers are fused to each other can be easily formed by heating and stretching at a temperature that does not cause oxidation.

As described above, the fishing line according to the present invention is characterized by being thinner and stronger than conventional fishing lines, and also has good transparency, and when made with Harris, it is difficult to be detected by fish and can withstand the weight of large fish. On the other hand, when used as a road thread, it is flexible, has low resistance to flow, and is difficult to be washed away by currents, etc., making it an extremely versatile and excellent thread. It has the advantage of being able to provide suitable fishing lines.

The method of measuring physical properties used for evaluation of the present invention is as follows.

Measuring method for tensile strength of fibers> Tensilon manufactured by Toyo Baldwin was used to measure the S-8 curve of a single fiber under the conditions of a sample length (gauge length) of 200 mm and an elongation rate of 100%/min, and the tensile strength (g/d ) was calculated. The characteristic values were taken as the average value of the values measured for 20 filaments.

Method for measuring knot strength of fibers> 7, 6 specified in J I5-L1013 (1981)
According to the method.

Measuring method of impact strength of fibers> Using a high-speed tensile tester, the sample length was ioam and the tensile speed was 6 m.
A tensile test was conducted under the condition of /sec, and the maximum stress reached during the tensile test was determined. The characteristic values were taken as the average values of those measured for 10 samples.

The present invention will be described in detail below with reference to Examples, but the present invention is not limited to these Examples.

Example 1 After dissolving ultra-high molecular weight polyethylene having a flexible polymer chain with a weight average molecular weight of 1.9 x 10' in decalin,
The spinning stock solution is extruded from a spinneret into the air at room temperature at a temperature at which the polyethylene solution does not solidify within the spinning device, and is cooled to form gel-like fibers. Eight of these gel-like fibers containing decalin were pulled together, combined, and stretched at a total stretching ratio of about 58 times so that the gel-like fibers would not be fused. The obtained fiber has a monofilament shape due to fusion, and the cross-sectional area is 0.0
It was 804tJ (converted diameter 0.32mm). This was designated as Experimental Sample 1, and the characteristic values of the monofilament are shown in Table 1. Furthermore, as a comparative example of the present invention, solution spinning was performed using polyethylene having a flexible polymer chain with the same molecular weight as that of the experimental Nal, and four of the resulting gel-like fibers were drawn together and spliced. Stretching was carried out at a total stretching ratio of about 25 times at a temperature of 30%. The obtained fibers had a monofilament shape due to fusion, and the cross-sectional area was 0.0887.7 (converted diameter 0.338 mm). This is called experiment Ha 2,
Table 1 shows the physical properties of the monofilament. For comparison, a commercially available nylon fishing line with a cross-sectional diameter of 0.33 m and having the characteristic values shown in Table 1 was used as Experiment Na3.

Furthermore, for comparison, we selected polyparaphenylene terephthalamide as the material, but since it was impossible to create a monofilament equivalent to nylon fishing line No. 4, we used 1000 d
The yarn properties of /E380f multifilament are shown in Table 1 as Experimental Sample 4.

As is clear from Table 1, the monofilament (Experiment N (LL)) used as the fishing line of the present invention has extremely superior tensile strength and knot strength compared to the conventional fishing line (Experiment No. 3), and the impact strength is also higher than Experiment No. 3. 37. for 9.2 g/d.
It can be seen that it has an extremely excellent performance of 2 g/d. However, in the case of experimental Na2 with a tensile strength of 18.5 g/d, which is an example that does not satisfy the characteristic values specified in the present invention, the impact strength is 19.7 g/d, compared to 37.2 g/d of the present invention. It can be seen that the degree of improvement is small. In addition, in the case of the polyparaphenylene terephthalamide fiber of Experiment No. 114 shown as a comparison, both tensile strength and knot strength meet the characteristic values specified in the present invention, but the impact strength is extremely low at 10.3 g/d. It can be seen that the performance as a fishing line is inferior to that of the present invention.

Example 2 In order to clarify the performance of the fishing line of the present invention from a practical standpoint, a fishing experiment was actually conducted on Hejo Island using the monofilaments of Experiments Ha 1 to 3 of Example 1 as Harris. .

In the fishing experiment, the following conditions A to C were established.

B. The target fish is amberjack with a body length of 80 cm or more.

There were three anglers, and each person always used three rods, each dedicated to the experimental Na 1 to 3 Harris.

C. The fishing experiment was conducted for three consecutive days, and the number of amberjacks caught and the number of times the rods were caught using Harris-compatible rods 1 to 3 were counted.

Table 2 shows the overall results of the fishing experiments conducted under the conditions A to C above.

It was found that the number of students who made it to the second table was high, indicating that they achieved good results.

Claims (1)

[Claims] (1) Ultra-high molecular weight polyethylene fibers consisting of flexible polymer chains having a tensile strength of at least 20 g/denier, a knot strength of at least 8 g/denier, an impact strength of at least 30 g/denier, and an elongation of 4% or more. A new fishing line used.