JPS5842733B2 - Guyomou - Google Patents

Description

[Detailed description of the invention] FIELD OF THE INVENTION The present invention relates to fishing nets.

More specifically, heavy metal thread a coated with polyamide-based synthetic resin and polyamide-based synthetic fibers are combined so that the lead alloy weight content is 40 to 60%, and the weight composition ratio is 0.15.
≦<0.50. Total denier of twine DT1 weight a10s - Single yarn denier DM of metal thread is DT≧0.01DM2
The present invention relates to a fishing net characterized by being configured to satisfy the following.

BACKGROUND OF THE INVENTION There have been many known fishing net threads, which are particularly important materials among fishing gear materials, and it is well known that these fishing net threads are used as appropriate depending on their characteristics.

Characteristics that are particularly important for fishing net thread are generally excellent mechanical properties and excellent handling properties, but these characteristics are closely related to catchability. be.

Therefore, it goes without saying that the most important thing for fishing net thread is high fishing performance.

Among various fishing methods, the purse seining method is known as a particularly aggressive fishing method, and includes methods such as 1-huhiki and 2-hiki. When a school of fish is found, nets are cast to surround the school of fish to prevent them from escaping. Then carry out the capture.

Therefore, as mentioned above, the most required characteristic of a fishing net used in purse seine fishing is that it must be able to quickly surround the discovered school of fish. An important characteristic is how to prevent escape.

It goes without saying that other properties must be excellent, such as strength against impact stress applied to the net fabric, fatigue resistance against repeated loads, and chemical resistance.

Conventionally, fishing net threads used in purse seine field have been made of polyethylene terephthalate fibers or polyvinylidene chloride fibers because of their relatively high specific gravity and excellent settling properties.

However, polyethylene terephthalate fibers and polyvinylidene chloride fibers have a low elastic recovery rate of the mesh threads when stress is applied to the mesh fabric, low impact resistance, and polyethylene terephthalate fibers adhere to the mesh threads.

It had the disadvantage that its strength was reduced by the ammonia generated by the decomposition of fish.

The object of the present invention is to improve these drawbacks and provide a high-performance fishing net with excellent durability.

The present invention was obtained as a result of intensive research to achieve the above object, and has the following configuration.

That is, a heavy metal thread a coated with a polyamide-based synthetic resin such that the weight content of lead alloy is 40 to 60%.
The weight composition ratio of polyamide and polyamide synthetic fibers is 0.15.
≦l≦0.50, and the total denier DT of the tow-in and the single yarn denier DM of the heavy metal yarn are DT≧0.01 D
This is a fishing net characterized by being configured to satisfy "M".

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic diagram of a fishing net according to the invention.

In FIG. 1, a mesh 1 is formed by mesh legs 2 and intersections 3 of the mesh legs 2.

The shape of the intersecting portion 3 changes depending on the method of knitting, and is formed either with knots or without knots.

FIG. 2 is an example of an enlarged schematic diagram of the net leg 2.

In FIG. 2, a heavy metal yarn a coated with a polyamide synthetic resin and a polyamide synthetic fiber yarn are twisted together to form the net legs 2 shown in FIG.

The heavy metal thread here refers to a lead alloy with a specific gravity of about 11.0, which is particularly high among heavy metals such as tin and copper, and is coated with a polyamide-based synthetic resin.

Examples of methods for coating heavy metals with polyamide-based synthetic resins include fibers coated with heavy metals such as nylon 6 and nylon 66, or core-sheath type composite fibers with heavy metals as the core and polyamide-based synthetic resin as the sheath. good.

Further, the polyamide synthetic fiber yarn refers to nylon-6, nylon-66, etc., and the type thereof is not particularly limited.

Further, the single yarn denier of the polyamide synthetic fiber is not particularly limited, and any multifilament that is commonly used for fishing nets may be used.

FIG. 3 is an enlarged cross-sectional view taken along line AA' of the net leg in FIG. 2.

In FIG. 3, one or more heavy metal threads a are formed in the net leg depending on the size of the single yarn denier of the heavy metal thread a.

Figure 4 shows the relationship between the weight composition ratio of heavy metal 4a in the net legs made by twisting and twisting heavy metal threads a and polyamide synthetic fibers, and the specific gravity ρ of the net legs. It is a figure shown as a parameter.

In FIG. 4, the specific gravity of the heavy metal yarn a is determined by the mechanical properties required for the heavy metal yarn, spinning properties, etc.

Mechanical properties, especially tensile strength properties, are determined by the metal content in the heavy metal thread.

Therefore, if the specific gravity of the metal itself is higher, if the specific gravity is the same,
It is possible to adjust the amount of polyamide-based synthetic resin that is the coating.

Therefore, it is possible to bring the mechanical properties closer to the properties of polyamide synthetic resin.

The metal content in the heavy metal yarn is preferably about 40 to 60% by weight from the viewpoint of spinnability.

The upper limit of 60% is determined from the viewpoint of the mechanical properties of the heavy metal thread, and the lower limit of 40% is determined from the fact that as the diameter of the heavy metal thread becomes smaller, the spinning properties are extremely deteriorated.

When the specific gravity is converted from the above-mentioned results, the specific gravity of the heavy metal thread corresponds to 1.8 to 2.5.

On the other hand, in the case of fishing nets, especially purse seine fishing nets, the higher the specific gravity of the net fabric is, the better from the viewpoint of the settling and blowing characteristics of the net fabric, but from the viewpoint of the weight of the net fabric, it is preferable to use a lighter net fabric. The specific gravity of the polyester fiber used is preferably about 1.3 to 1.5.

In Figure 4, the specific gravity of heavy metal thread ρ11.8 and ρ2
2.5 and the specific gravity of the net material ρa1.3 and ρb1.5, respectively, surrounded by the intersections C, D, E, and F, 0, 15≦r 1≦0.50 is necessary when used as a fishing net. This is the condition.

FIG. 5 shows the relationship between the single yarn denier and bending hardness of the heavy metal yarn using the specific gravity ρ11.8 and ρ22.5 of the heavy metal yarn as parameters.

In FIG. 5, as the specific gravity increases, the bending hardness of the heavy metal thread decreases.

The reason for this is thought to be that the diameter of the heavy metal thread decreases as the specific gravity increases.

On the other hand, the bending hardness of fishing net twines made of conventional polyamide synthetic fibers varies slightly depending on the twist structure and single yarn denier, but compared to monofilament type twines, they are extremely low and flexible, such as A twine made of multifilament yarn that has traditionally been used for fishing nets, and a twine of about 3000 denier used for purse nets or gill nets, has a bending hardness of 1.
It weighed about 5g and was very flexible.

In order to improve the specific gravity of the twine using the heavy metal yarn according to the present invention, as explained in FIG.
It is necessary to intertwine the heavy metal thread a and the polyamide synthetic fiber so that 0.15<cloalite<0.5.

However, when the single yarn denier of the heavy metal yarn increases, the bending hardness increases significantly, so when twisted with polyamide synthetic fibers, the bending hardness of the heavy metal yarn increases due to the single yarn denier of the heavy metal yarn. is greatly influenced.

Figure 6 shows the bulk of the fabric mainly due to bending hardness.
FIG. 2 is a diagram showing the relationship between the single yarn denier DM and the twine total denier DT of the heavy metal yarn using handling characteristics during operation as parameters.

In Fig. 6, the sample shows a weight composition ratio of heavy metal thread a and polyamide synthetic fiber ``1 is 0.15≦1≦1≦0.
50 and the specific gravity of the twine was 1.3 to 1.5 and the specific gravity of the heavy metal thread was 1.8 to 2.5. The possibility of using it as a compound was determined by a sensory method.

The judging method is as follows: +1 point if it can be used as a fishing net, 0 points if it cannot be used as a fishing net, 11 points if it cannot be used, and if the total score is 7 points or more, it can be used.
0 to 6 points are shown as a △ mark, and -1 points or less are shown as an unusable × mark.

In FIG. 6, the equation of the boundary line between usable and unusable is approximately DT=0.01DM'', and the usable area is above the boundary line, that is, DT≧o, o I DM''.

The fishing net according to the present invention has the mechanical properties of polyamide synthetic fibers of conventional fishing nets, and has a specific gravity similar to that of conventional polyester fibers, making it an excellent fishing net with high durability and fishing efficiency. Therefore, it is an effective fishing net that can fully demonstrate the performance required as a fishing gear material.

The fishing net of the present invention is preferably used for fixed nets, gill nets, etc., and is particularly effective in the field of purse seine where the blowing and settling properties of the net are important.

Next, examples of fishing nets according to the present invention will be described.

Example 1 Four 210-denier, 24-filament nylon-6 multi-brame fibers were made into a nylon-6 resin sheath, the core was made of lead alloy, and melt-spun using a core-sheath composite spinning method, followed by ordinary synthetic fiber drawing equipment. Single yarn Denny obtained by drawing /
One heavy metal yarn having a length of 500 and a specific gravity of 2.2 was twisted in the downward direction, and three of the resulting twisted yarns were combined and twisted in the upward direction.

The weight composition ratio of the heavy metal threads in the obtained twine was 0.37, and the specific gravity was 1.38.

Table 1 shows twine characteristics compared to polyester-based and polyamide-based conventional twine for fishing nets.

The fishing net according to the present invention has superior properties compared to conventional fishing nets.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a fishing net according to the present invention, FIG. 2 is a schematic diagram of a net leg of a fishing net according to the present invention, FIG. 3 is an enlarged cross-sectional view taken along line A-A' of the net leg in FIG. 2, and FIG. 4 is a schematic diagram of a fishing net according to the present invention. Figure 5 is a diagram showing the relationship between the weight composition ratio of heavy metal yarn in the twine and specific gravity. Figure 5 is a diagram showing the relationship between single yarn denier and bending hardness of heavy metal yarn. Figure 6 is the relationship between the weight composition ratio of heavy metal yarn in the twine and the bending hardness. FIG. 2 is a diagram showing the relationship between single denier and twin denier of heavy metal yarns. Explanation of main symbols: 1...mesh, 2: net legs or twine, 3: intersecting part, a: heavy metal thread, b = polyamide base fiber.

Claims (1)

[Claims] 1 The weight composition ratio of heavy metal thread a coated with polyamide synthetic resin and polyamide synthetic fiber so that the lead alloy weight content is 40 to 60% is 0.15≦≦0.50 A fishing net characterized in that the total denier DT of the twine and the single yarn denier D of the heavy metal threads satisfy DT≧0.01DM.