JPH0142453Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is to deposit algae in areas where algae cannot grow, such as rocky rocky areas and sandy mud areas, to efficiently attach zoospores of algae, and to grow them into large-scale seaweed. The invention relates to netting for creating seaweed beds.

Brown algae, red algae, etc. grow in rocky reef areas where the water temperature is relatively low, and in shallow waters where they are necessary for photosynthesis.

By the way, in recent years, large amounts of phosphorus, nitrogen, sludge, etc. have been discharged into industrial and domestic wastewater, resulting in pollution and eutrophication of shallow sea areas, and furthermore, changes in ocean currents due to the addition of coastal structures, etc. As a result, certain organisms such as colonial seaweed and calcareous algae proliferate abnormally, enveloping the reef surface and inhibiting the attachment of algal zoospores, and on the other hand, ingesting algae, especially brown algae. In response to the increasing demand for rockfish such as abalone, sea urchins, and turban shells that grow on the shore, large numbers of these juveniles are being stocked and reared, resulting in a marked increase in feeding intensity, and they are now settling on rocky reef surfaces. Because zoospores are also fed before they have fully grown, the so-called rocky shore phenomenon, where no algae can be seen growing or flourishing in rocky reef areas, is rapidly expanding.
The supply of edible seaweed, as well as the availability of food, is becoming increasingly tight, and there is a strong demand for the creation of seaweed beds as a countermeasure.

For this reason, the current methods are to blow up reefs covered with colonies of seaweed and calcareous algae, or to mechanically peel off the reef surface to regenerate the epiphytic surface for migrating threads, or to throw in large amounts of rock. New epiphytic surfaces are formed, but reef blasting and mechanical abrasion of rock surfaces are not only highly dangerous, but also inefficient in forming epiphytic surfaces, although they require a huge amount of expense and labor. Moreover, when dropping rocks in shallow waters, unless large and multiple rocks are dropped, they will be easily tumbled by the waves and it will be impossible to create a seaweed bed, so transporting and dropping them requires a huge amount of labor and time. Even if the epiphytic surface of zoospores is regenerated or newly formed by these,
It becomes necessary to repeat these operations every 1 to 2 years because colonies of sea urchins, calcareous algae, etc. will be attached and enveloped again in 1 to 2 years at most, and therefore, reef blasting and rock surface demolition will gradually destroy the reef area. Also, when rocks are dropped, they gradually accumulate, causing changes in ocean currents, causing coastal scouring, and causing problems for other fisheries, among other problems.

The present invention provides a mesh fabric for creating a seaweed bed that solves this problem.The embodiments of the present invention will be described below in detail based on the drawings. Figure 1 is a cross-sectional explanatory diagram of the bulky yarn used in the present invention. , FIG. 2 is a cross-sectional view of the mesh yarn of the present invention, FIG. 3 is a perspective view of the present invention, and FIG. 4 is a usage diagram of the present invention, and shows the bulky yarn 1 used in the present invention.
The polyester film 1A is selected because it is strong, has a relatively large specific gravity, and has excellent abrasion resistance, and one side of the polyester film 1A is coated with an inorganic powder 1 made of iron powder, glass powder, or stone powder.
B is pasted with an appropriate adhesive 1C, and by performing a stretching process at a required stretching ratio, it is stretched in the longitudinal direction and shrunk in the width direction, and upon shrinking in the width direction, the polyester film 1
Due to the difference in shrinkage between A, the inorganic powder 1B, and the so-called inorganic powder adhesion surface, both edges 1D and 1D' are formed by being rolled and deformed with the inorganic powder adhesion surface outside. It is something. In this case, since the rigidity of the polyester film 1A is increased by the stretching process, it is desirable to use a film with a thickness of approximately 8 to 24 μm in order to maintain its apparent flexibility so as not to hinder knitting. , and inorganic powder 1
B should be adhered as homogeneously and densely as possible, and should have a fine particle size, preferably about 4 to 12 μm, in order to minimize external frictional resistance and prevent peeling during use. is suitable. Furthermore, the amount of the inorganic powder 1B adhered to the bulky yarn 1
Care is taken to maintain the actual specific gravity of at least 1.4.

The required number of bulky yarns 1 thus obtained are twisted to form a bulky yarn strand 2, and 2 to 4 of the bulky yarn strands 2 are twisted together to form a net yarn 3. The present invention 4 is formed by knitting it into a required mesh with knots.

The present invention 4 is used by being laid down in shallow seas where waves and currents are strong, but especially in shallow seas facing the open ocean, the waves and currents are even more intense, and the present invention 4, which is laid down and laid down, may flow or sway, resulting in rock formations. There is a risk of abrasion with the surface, so please do not use it in areas with strong waves or currents.
As shown in Fig. 5, lead wire 5 is mixed into bulky yarn 1 in an appropriate proportion, and high specific gravity mesh yarn 3' is formed to have an effective specific gravity of 2.5 or more, and knitted to the required mesh size. It is preferable that The present invention has the above-mentioned configuration, in which inorganic powder is adhered to one side of a polyester film.
It is knitted with knots using a bulky yarn whose both edges are wound and deformed with the surface to which the inorganic powder is attached to have a specific gravity of at least 1.4, so it has excellent settling properties and can easily be used as needed. It can be easily laid by simply allowing it to settle in the sea, and since inorganic powder is exposed on the outer surface of the net, and it is knotted, it can be efficiently laid on the outer surface of the net while providing water stimulation to floating zoospores. Furthermore, since the mesh yarn is made of twisted bulky yarn, many voids are formed, so even when the zoospores spread and grow after settling, they are sufficiently entangled and fixed in the voids. Because of its increased sexiness, it can be grown as a large seaweed. In addition, because the present invention is knotted, the knotted part serves as a base for raising the bottom of the net that is laid down on the seabed, and creates a void between the seabed surface and the net, so it does not sink even in areas with sandy and muddy bottoms. Not only can it be used to create seaweed beds, but the entire net fabric does not rub against the reef surface even in rocky areas, and since it is made of polyester film, it has extremely high wear resistance and dust. Therefore, it can be said that the netting for seaweed bed creation has many advantages such as it can be used safely for a long time and can be removed after use by simply pulling it up.

[Brief explanation of the drawing]

Figure 1 is an explanatory cross-sectional view of the bulky yarn used in the present invention;
FIG. 2 is a cross-sectional view of the net yarn of the present invention, FIG. 3 is a perspective view of the present invention, FIG. 4 is a usage diagram of the present invention, and FIG. 5 is a cross-sectional view of the high specific gravity net yarn. Explanation of symbols, 1... Bulky yarn, 1A... Polyester film, 1B... Inorganic powder, 1C... Adhesive, 1D, 1D'... Both side edges, 2... Bulky yarn strand, 3... Net yarn , 4...This invention, 3'...
High specific gravity mesh yarn, 5...lead wire.

Claims (1)

[Claims for Utility Model Registration] (1) An inorganic powder is attached to one side of a polyester film, and both edges of the film are rolled and deformed by a stretching process with the inorganic powder attached side facing outward. A net fabric for creating a seaweed bed, characterized in that it is knitted with knots using bulky yarns having a specific gravity of at least 1.4. (2) The net fabric for creating a seaweed bed as set forth in claim 1 of the utility model registration claim, characterized in that the bulky yarn is mixed with lead wire in an appropriate proportion to have a specific gravity of 2.5 or more.