JPS5846133Y2 - Yarn for fixed fishing nets - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to yarn for fixed fishing nets.

Due to the nature of the fishing method, fixed fishing nets are spread out in a predetermined location in the sea for long periods of time.Currently, fixed fishing nets are mainly made of synthetic monofilament or multifilament yarns twisted to the required diameter. Because it is a knitted net, there are many gaps between the twists of these materials in the yarn, and synthetic fiber materials are susceptible to fuzzing due to abrasion and fibrillation due to light deterioration. These are suitable places for diatoms to settle, and as the fishing net is used, the diatoms that have settled in the intertwine gaps, fluffy parts, and fibnolized parts will quickly expand their roots and grow, forming a net. This will cause the net to become blocked, which will increase resistance to the tidal current and cause the net to be blown away.Not only will it lose its ability to intimidate and guide fish schools, but if left unchecked, it will cause serious consequences such as broken nets and shifting of fixed facilities.

For this reason, the current situation is that net-drying and net-changing operations are required to kill and remove the resistant diatom shellfish several times during the fishing season, or expensive algaecide treatment operations are required. The cost and effort involved is also significant.

The present invention has been made to solve this problem, and by twisting a narrow base tape 1 made of biaxially stretched polyvinyl chloride or polyester film, the material can be bonded to each other. By using net yarn that has extremely small twist gaps and prevents fibrillation caused by abrasion or light deterioration over the course of use, it is possible to suppress the adhesion of diatom shellfish as much as possible, and also to prevent diatom shellfish that are resistant to adhesion. It is an object of the present invention to provide a fixed fishing net that is made to fall off due to the corrosion peeling action of the corrosion peeling layer 3 formed on the surface of the net yarn, thereby maintaining a good net structure over a long period of time and making it possible to achieve a high catch. be.

Embodiments of the present invention will be described below in detail based on the drawings. Fig. 1 is an enlarged cross-sectional view of a corroded release layer forming tape having a corroded release layer on one side, which is the material of the present invention, and Fig. 2 is a cross-sectional view of the material of the present invention. , the base tape 1 is obtained by cutting a biaxially stretched polyvinyl chloride or polyester film into a narrow width, and the width of the base tape 1 is determined by the diameter of the desired net fabric yarn. Although the diameter is appropriately selected, it is preferably about 2 to 3 times the diameter of the net fabric yarn.

On the other hand, the thickness is limited to approximately 10 μmm to 40 μmm. If the thickness is 40 μmm or more, the rigidity of the base tape 1 itself increases, making twisting or knitting work difficult. On the other hand, if the thickness is 10 μmm or less, During twisting, a large number of unnecessary wrinkles are likely to occur, and there is a risk that the wrinkles may serve as a place for diatoms to settle.

Easily corrosive powder 2 made of iron powder or iron oxide powder is applied to one or both sides of the base tape 1.
An erodible release layer forming tape 4 is prepared in which an erosive release layer 3 is attached in a weight ratio of 2 to 20%.

As easily corrosive powder 2, iron powder or iron oxide powder is most suitable because oxidative corrosion is promoted in the sea and a peeling effect accompanying this is expected.In particular, iron powder has a higher oxidation rate in the sea than iron oxide powder. Since the speed is about 30 to 50% faster, it is suitable for fishing grounds where diatom shellfish have a strong growth resistance.

It is preferable that the iron powder or iron oxide powder be as finely granular as possible because it is excellent for achieving strong and homogeneous adhesion.

If the amount of the easily corrosive powder 2 applied is less than 2% of the weight of the base tape 1, the corrosion peeling effect can only be expected during the fishing season (6 to 10 months); If the corrosion release layer forming tape 4 itself increases in rigidity, the workability of twisting and knitting becomes worse, and the amount of peeling due to abrasion increases in each working device, and a knitted fabric is required. The amount increases to such an extent that it becomes difficult to handle.

There are no particular restrictions on the adhesive 5 used to adhere the easily corroded powder 2 to the base tape 1 as long as it does not lose its adhesive performance underwater.

The present invention is created by twisting the required number of corrosion release layer forming tapes 4 thus formed, but when twisting the corrosion release layer forming tape 4 with the corrosion release layer 3 formed on one side, the corrosion release layer forming tape 4 is twisted. Care should be taken to twist the layer 3 so that it is exposed on the outer surface.

The present invention has such a configuration, and the enshrined fishing net knitted using the present invention has almost no twisting gap on the outer surface of the net yarn, and there are two gaps in the base tape 1. By taking advantage of the properties of the shaft film, there is no fluffing when worn, and ultraviolet rays, which are a factor of photodeterioration, are blocked by the corrosive release layer 3 formed on the outer surface, which prevents the base tape 1 from fibrillating. As a result, the adhesion resistance of the diatoms and molluscs that adhere to the outer surface of the diatoms is significantly suppressed, and the fine particles of the easily corroded powder 2 of the corrosive peeling layer 3 that forms the outer surface are gradually oxidized and corroded and peeled off. , it falls off with the peeling action, and the net fabric always maintains a good state of flow.

Moreover, it is possible to easily adjust the specific gravity between 1°4 and 2.5, which is considered to be the ideal specific gravity for fixed fishing nets, by applying the amount of easily corrosive powder 2. Combined with ease, it is possible to provide a fixed fishing net with extremely excellent net structure.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional view of an eroded release layer forming tape having an eroded release layer on one side, and FIG. 2 is a perspective view of the product. DESCRIPTION OF SYMBOLS 1... Base tape, 2... Easily corroded powder, 3... Corrosive release layer, 4... Corrosive release layer forming tape, 5... ...adhesive.

Claims (1)

[Scope of utility model registration request] A base tape 1 made by cutting a biaxially stretched polyvinyl chloride or polyester film into thin strips is coated with easily corrosive powder 2 made of iron powder or iron oxide powder in an amount of 2 to 20% by weight on one or both sides. A raw yarn for a fixed fishing net, which is obtained by twisting together corroded release layer forming tapes 4 having a corroded release layer 3 adhered thereto.