JPS60164421A - New fishing line - 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 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: Harris and Michi lines, and the requirements for the former are thin and strong (particularly strong knots), moderate stiffness, and fast sinking.

It is difficult to see underwater (color, transparency), and it is difficult to shrink.

The performance required for the latter is long-distance castability, flexibility and ease of winding the reel, and light weight of the line.

These include ease of use and durability. 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 property reduces the resistance to the flow and makes it difficult to be washed away by currents. Become.

However, in the case of commercially available Harris yarns, the tensile strength of 5-polyfutuca nylidene yarn is at most 8 f/d, and even in the case of nylon yarn, the tensile strength of the normal strong type is 10 f/d.
Even if it is a high-strength type, it has a strength of at most 159/d, and the reality is that no fishing line with a strength higher than this has been obtained.

Recently, high-strength fibers made of aromatic polyamide have been developed, but when using this type of fiber for fishing lines,
The strength is about 20 f/d, which is satisfactory in terms of strength, but fishing line,
It was particularly unsuitable for Harris thread.

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 the above-mentioned circumstances, the inventors of the present invention have made extensive studies to eliminate the drawbacks of the conventional fishing line described above, and have therefore developed the patent application No. 1522611ij of 1983, patent application No. 154622 of 1981, and the patent application No. 154622 of 1981. 1958 Patent Application No. 161044
Surprisingly, synthetic fibers made of flexible polymers such as polyethylene obtained by the method described in No. The present inventors discovered that by using the fiber as a fishing line, all the drawbacks of the conventional fishing line described above can be overcome, and a fishing line that is superior to the conventional fishing line can be obtained.

That is, one aspect of the present invention is a novel fishing line characterized by using synthetic fibers made of flexible polymer chains having a tensile strength of at least 202/denier and a knot strength of at least 8 F/denier.

The flexible molecular chain referred to in the present invention means that when subjected to stress or heat,
A molecular chain consisting of rotatable molecular bonds, and the molecular chains constituting wholly aromatic polyamides, wholly aromatic polyesters, etc. are rigid and straight molecular chains and are not included in the flexible molecular chains referred to in the present invention. do not have. 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.

What is the synthetic fiber consisting of flexible polymer chains in the present invention?1
Examples include, but are not limited to, polyolefins such as high molecular weight polyethylene and polypropylene, polyacrylonitrile/I/, and polyvinylidene fluoride.

The fishing line of the present invention is 20 f/denier or more, preferably 20 f/denier or more.
A flexible polymer having a tensile strength of 5 f/denier or more, especially 302/denier or more, and a knot strength of 8 f/denier or more, preferably 10 f/denier or more, especially 12 t/denier or more. Since it is a synthetic fiber consisting of chains, it is thinner and stronger than conventional fishing line, has good transparency, and has particularly strong knot strength, and when used as a Harris line, it is difficult to be detected by fish. , can withstand the weight of larger fish,
If there is very little Harris breakage and one way thread is used,
Because it can be made thinner than 1/2 of conventional threads, it is flexible, has low resistance to currents, and is therefore difficult to be washed away by tidal currents. Here the tensile strength is 20f
/denier, it becomes impossible to obtain a fishing line that is thinner and stronger than conventional fishing lines. Further, if the knot strength is less than 8 f/denier, when using Harris, there will be a lot of Harris breakage, and the degree of Harris breakage will not be much different from that of conventional Harris, which is not preferable.

The synthetic fiber used in the fishing line of the present invention consists of flexible polymer chains and is at least 20 f/denier, preferably 25 f/denier.
Any material may be used as long as it has a tensile strength of 1 denier or more, especially 30 f/denier or more, and a knot strength of 8 F/denier or more, preferably 10 f/denier or more, especially 12 f/denier or more. However, it is particularly advantageous to use high molecular weight polyethylene having a weight average molecular weight of 500,000 or more because the cost of raw materials is low and yarn production is easy.

In addition, flJ has also shown that, especially for those having an impact strength of 400 J/denier or more, the occurrence of Harris breakage is further reduced.

Next, a method for manufacturing a fishing line according to the present invention will be briefly explained.

The monofilament used in the fishing line of the present invention is, for example, a high-molecular-weight polyethyline containing flexible polymer chains (e.g., the weight average molecular weight is] X105 or more, preferably lX106
After completely dissolving the above-mentioned ultra-high molecular weight polyethylene in a solvent such as decalin, xylene, or paraffin at a temperature below the boiling point of the solvent, it is placed in the air at room temperature, in water, or in a cooling device at a temperature that does not solidify the polyethylene solution in the spinning device. extrude into a hollow tube. Since the extruded yarn contains a solvent, it is heated to an extent that the yarn does not melt in that state, and then stretched in one or multiple stages so that the total stretching ratio is 10 times or more, preferably 20 times or more. However, the method 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. tr
It has the advantage of being able to provide a fishing line with excellent versatility and fishing line suitability for the first time.

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

<Method for measuring tensile strength of fibers> Using Tensilon manufactured by Toyo Boldwine Co., Ltd., the S-8 curve of a single fiber was measured under the conditions of a sample length (gauge length) of 200 mm and an elongation rate of 100%/min, and the tensile strength ( t/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> Methods 7 and 6 specified in JIS-L1013 (1981).

<Delicate impact strength measurement method> Using a high-speed tensile tester, sample length 10 m, tensile speed 5 m
A tensile test was conducted under the conditions of /see, 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 106 in decalin, the spinning stock solution was passed through a spinneret in a spinning device at a temperature at which the polyethylene solution would not solidify. The fibers are then extruded into the air at room temperature and cooled to form gel-like fibers.

Eight gel fibers containing decalin are drawn together and spliced, and the total stretching ratio is approximately 5 at a temperature that does not melt the gel fibers.
It was stretched 8 times. The obtained fiber was fused and used as Experiment A1, and the characteristic values of the monofilament are shown in Table 1. Next, solution spinning was performed using polyethylene having a flexible polymer chain with the same molecular weight as Jikkenya 1, and four of the resulting gel-like fibers were drawn together and doubled, and the fibers were completely spun at a temperature that would not cause the gel-like fibers to melt. It was stretched at a stretching ratio of about 63 times. The obtained fiber has a monofilament shape due to fusion, and the cross-sectional area is 0.0415 d.
(converted diameter 0.23 Jm). This was designated as Experiment Black 2, and the characteristic values of the monofilament are shown in Table 1. Furthermore, as a comparative example of the present invention, polyethylene having a flexible polymer chain with the same molecular weight as Jikken Black 1 was solution-spun, and four of the resulting gel-like fibers were drawn together and doubled. The film was stretched at a total stretching ratio of approximately 25 times at the melt cutting temperature. The obtained fibers exhibit a monofilament shape by fusion, and the cross-sectional area is 0.0887 mJ (converted diameter 0.336 mJ).
1#II). Realize this! ItA is 3, and the characteristic values of the monofilament are shown in Table 1. 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 A4.

Furthermore, for comparison, polyparaphenylene terephthalamide was selected as the material, but it was impossible to create a monofilament equivalent to No. 4 nylon fishing line.7'c(7)-t'
, 1000d/680f multifilament yarn properties are shown in Table 1 as Experiment A5.

Table 1 As is clear from Table 1, the monofilament used as the fishing line of the present invention (Experiments 1 and 2) was different from the conventional fishing line (Experiment A
Compared to 4), both tensile strength and knot strength are extremely superior, and the impact strength is 37.2 to 4 compared to 9.2 f/d for experimental grave 4.
It can be seen that it has an extremely excellent performance of 0.8 f/d.

However, in the case of experiment A3 in which the tensile strength was 18.5 f/d, which was an example that did not satisfy the characteristic values specified in the present invention, the impact strength was 19.7 f/d, which was 37.2 to 40.8 f/d according to the present invention.
It can be seen that the degree of improvement is small compared to d. In addition, in the case of the polybara phenylene terephthalamide fiber of Experiment A5 shown as a comparison, both the tensile strength and knot strength meet the characteristic values specified in the present invention, but the impact strength is 10.3.
f/d is extremely low, and 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 Al to 4 of Example 1 as Harris. friend.

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

B. The target fish was amberjack with a body length of 60 mm or more. There were three anglers, and each fisherman always used four rods, each dedicated to the fish of Experiments A1 to A4.

Ha, the fishing experiment was conducted for 3 consecutive days, and the results were as follows:
The number of amberjack caught using each Harris-compatible rod in 4.
Count the number of times Harris is cut off.

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

Table 2 As is clear from Table 2, when the fishing line of the present invention (Experiment No. 1) is used, good results can be achieved with fewer seams breaking. Furthermore, it can be seen that even if the fishing line of the present invention (Experiment A2) is as thin as No. 2, it is possible to achieve results equivalent to or better than the conventional No. 4 fishing line (Experiment J64).

Patent Applicant Toyobo Co., Ltd. Procedural Amendment 11-(Voluntary) 1. Indication of the case Patent Application No. 21188 of 1982 2. Name of the invention New fishing line 3. Person making the amendment Interaction with the case Patent applicant Osaka Ichikita-ku Dokff<2-2-8-4, Detailed explanation of the invention column 5 of the specification subject to amendment, Self-answer for amendment (1) 1400J on page 6, line 14 of the specification is changed to “3 X
Corrected to 1O-4J.

Claims (1)

[Claims] 1. A novel fishing line characterized in that it is made of synthetic fibers consisting of flexible polymer chains having a tensile strength of at least 20 t/denier and a knot strength of at least 8 f/denier. 2. The novel fishing line according to claim 1, wherein the synthetic fiber is made of high molecular weight polyethylene.