JPS6245584Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a yarn for knitting a stationary fishing net, and more specifically, to a yarn for a stationary fishing net made by twisting together two types of metal filaments that have different ionization tendencies in the sea. Fixed fishing nets consist of nets consisting of fence nets, playground nets, box nets, etc., which are permanently deployed in a predetermined location in the sea over a long period of time to intimidate, guide, and intimidate migrating schools of fish.
Because fishing is carried out by trapping fish, a large amount of silica, shellfish, or seaweed will adhere to the net as it is used, and these will grow in a short period of time, significantly increasing tidal current resistance and wave resistance. This may result in the phenomenon of being blown away, poor tide passage, or decreased illumination inside the net, which not only makes it impossible to catch fish, but if left untreated, it can cause the net to break or the entire fixed facility to shift. For this reason, conventionally, nets have been pulled out of the sea every two to three weeks, and any silica, shellfish, or seaweed that has grown attached to them is dried and killed, and then they are pounded to remove them, a so-called drying operation. Not only did this drying work require an extremely large amount of labor, expense, and time, but it also required a huge amount of material costs, such as the need for alternative nets for drying the nets, which put significant pressure on the company's management. . In view of this situation, in recent years so-called algaecides or preventive agents have been developed that utilize the medicinal action of highly toxic heavy metal substances such as organotin and copper compounds and dissolve the heavy metal substances together with an adhesive in a solvent such as xylene or toluene. Attempts have been made to prevent the adhesion and growth of silica, shellfish, seaweed, etc. by soaking netting in staining agents, but these antialgae and antifouling agents are highly toxic. The washout of heavy metal substances not only causes serious problems for other fisheries, such as killing or deforming the larvae, young shellfish, spores, buds, etc. of fish and shellfish and seaweeds in nearby aquaculture fishing grounds, but also causes immersion and impregnation. As it is extremely dangerous in terms of handling, with frequent physical accidents such as workers collapsing due to inhalation or skin irritation during work, there are strong calls for banning and refraining from using it. It is something that exists. In view of these circumstances, the inventors conducted intensive research to realize a fixed fishing net that has anti-algae and antifouling properties, is non-polluting, and is highly safe to handle. It was discovered that where voltage and current effects are present, extremely strong anaerobic properties are exhibited.Therefore, in order to apply an electric field to a fixed fishing net, one or two strands of the yarn involved in its knitting are used.
The book consists of cathodized strands made by twisting copper wires together with yarns made of natural fibers or synthetic fibers so that they are exposed on the outer surface, and one or two other strands are made of yarns made of natural fibers or synthetic fibers. Metal wires made of tin, nickel, iron, zinc, aluminum, or alloys thereof, which have a greater tendency to ionize in the sea than copper wires, are mixed and twisted so that their outer surfaces are exposed, and the anodized strands are twisted together. They devised a method of forming a battery circuit under the sea based on the difference in their ionization tendencies, creating and circulating a current from an anodized strand to a cathodized strand, and thereby imparting an electric field to the knitted net. The content of this invention was disclosed in Utility Application No. 1985-085616 as an earlier application by a group that conducted research together with the inventor of the present invention. However, in the invention of the prior application, the contact point between the copper wire in the cathodized strand and the metal wire in the anodized strand is made only at the core center of the raw yarn, and the copper wire or metal wire has a high hardness and rigidity. The amount of copper wire in the cathodized strand is large, and therefore the amount mixed in is about one in one strand, and the yarn and the copper wire or metal wire are both twisted in the same direction. The metal wires in the anodized strands are not necessarily in contact with each other at every pitch interval of the strands, but rather they are in contact with each other at appropriate points.As a result, the battery circuits formed underwater can range from extremely small to abnormally large. Since the current created in the battery circuit flows from the metal wire to the shortest copper wire, the formation of the electric field becomes significantly non-uniform, and the silica algae, This also means that the electric field does not work effectively on the twisted strands where shellfish or seaweeds are most likely to attach and grow, and this was also confirmed by the results of tests using fence nets made using the invention of the prior application. Although the adhesion and growth of silica algae, shellfish, and seaweed throughout the net has been significantly suppressed and prevented, there are many areas of the net where the control and prevention have little effect and where the adhesion and growth are severe. However, the roots of diatoms, shellfish, and seaweeds are still significantly increased in the legs of the net fabric, that is, the strand twists of the raw yarn, and the properties are still sufficient in terms of anti-algae and antifouling properties. I can't say that. The present invention provides an element for forming a fixed fishing net to solve such problems.The embodiments of the present invention will be described below in detail based on the drawings. Figure 2 is the same cross section,
Figure 3 is a sketch of the present invention, and Figure 4 is a cross-sectional view of the same. Yarn 1A is made by twisting an appropriate number of natural fibers or synthetic fibers of an appropriate thickness, depending on the characteristics of the fabric used. In addition, the material or thickness is selected as appropriate. The yarn 1A has a wire diameter of
The strands 1 are formed by twisting the metal wires 1B having a thickness of 0.1 to 0.5 mm and made of tin, nickel, iron, zinc, aluminum, or an alloy thereof in the Z twisting direction so that the metal wires 1B are exposed on their outer surfaces. In this case, if the wire diameter of the metal wire 1B to be mixed and twisted is 0.1 mm or less, the practical performance will be short-lived, lasting about 1 year to 1 year and 6 months, due to the progression of natural destruction due to chemical reactions in the sea, which will impair economic efficiency. On the other hand, the wire diameter is
If it is 0.5 mm or more, the hardness and rigidity of the metal wire 1B will increase, making it difficult to knit the finished product, and the knitted fabric will also lose its flexibility and become bulky, causing problems in handling. Consideration should be given to what may occur. There is no particular restriction on the number of twists in the mixed twisting of the yarn 1A and the metal wire 1B, as long as they are twisted in a twist configuration equivalent to that of the strands of raw yarn for commonly used fishing net knitting.
Rather, it is determined by the diameter of the strands to be twisted and formed, but since the diameter of raw yarn for knitting fence is approximately 4 to 8 mm, the diameter of the strand in this case is approximately 2 to 4 mm. Also, since the raw yarn for knitting a playground net has a diameter of approximately 4 to 6 mm, the diameter of the strand in this case is approximately 2 to 3 mm, and the diameter of raw yarn for knitting a box net is approximately 4 to 6 mm. Since the diameter of the strands is 2 to 4 mm, the diameter of the strands is approximately 1 to 2 mm, and within this range of strand diameters, the number of twists is generally approximately 40 to 80 times per meter. Strand 1 thus formed is usually strand 3
Send books, or 2-4 of them if necessary, to each other.
The yarn 2 is formed by twisting the strands 1 in the S-twisting direction, and when the strands 1 are twisted in the S-twisting direction, the copper wires 2A having a wire diameter of 0.1 to 0.5 mm are twisted in the S-twisting direction. The strands are twisted in a spiral direction in the S-twisting direction along the inside of the strand twist 2B that is inevitably formed by the strand twisting. Similarly to the metal wire 1B, the diameter of the copper wire 2A used in such a location is 0.1 mm, in order to provide durability and usability for at least two years, since natural destruction occurs due to chemical reactions in the sea. On the other hand, if the wire diameter is 0.5 mm or more, it is not appropriate because the increase in hardness and rigidity will cause problems in knitting processability and handling of the knitted net fabric. Furthermore, when each strand 1 is twisted together to form an atom 2, there is no particular restriction on the number of twists, and it is generally determined by the diameter of the atom 2 to be formed. The diameter for net knitting is about 8 mm, and the diameter for box knitting is about 2 to 4 mm, so within these diameter ranges, the number of burns when forming strand 1 is approximately The twisting rate is approximately 40 to 80 times per meter. Incidentally, the occurrence and growth of periphyton such as diatoms, shellfish, and seaweeds vary markedly depending on water temperature, current, sunshine hours, amount of nutrients, etc. By applying a slight electric field to the ground, anti-algae and antifouling properties can be achieved. When knitting the net used in such a situation, one or two strands 1 mixed with the metal wire 1B and one or two untwisted strands twisted only with the yarn 1A are mutually combined. The electric field can be adjusted appropriately by twisting or using atoms obtained by reducing the number of copper wires 2A to one or two which are twisted together in a spiral manner along the inside of the strand twist 2B. The present invention has the above-mentioned configuration, and when the net made by knitting the present invention is used in the sea, the metal wires 1B mixed and twisted with the strands 1 of the raw threads constituting the net, and the atoms Copper wire 2 which is spirally twisted along the inside of the strand twist 2B
Since the wires A and A are intersected and have different ionization tendencies, a battery circuit is formed, and a current flows across the shortest distance from the metal wire 1B, which has a high ionization tendency, to the copper wire 2A, which causes the formation of attached organisms. It creates anaerobic conditions for the water and exhibits a remarkable anti-algae and anti-fouling effect. In the present invention, the metal wires 1B to be mixed and twisted with the yarns 1A are exposed on the outer surface and twisted in the Z-twisting direction to form the strand 1, while the strands 1 are twisted together in the S-twisting direction. Since the copper wires 2A are twisted in the S twist direction along the twist lines 2B of the strand 1,
Since the metal wire 1B and the copper wire 2A always intersect at approximately constant pitch intervals, the battery circuit is formed uniformly, and the entire network has a substantially uniform electric field.
The anti-algae and antifouling properties will be uniform. However, in the present invention, since the intersection between the metal wire 1B and the copper wire 2A is made at the strand twist 2B portion, that is, the outer surface of the atom, the electric field near the outer surface of the atom acts strongly, which improves the anti-algae and antifouling properties. This results in a further increase. Furthermore, the copper wire 2A is placed in the recessed part of the strand twist 2B where sessile organisms are most likely to attach and root expansion occurs.
Since the copper wires 2A are twisted together in a spiral manner, the recesses of the strand twists 2B are physically blocked, and the copper wires 2A produce copper sulfate, copper oxide, etc. through a chemical reaction with seawater. Therefore, by exerting a medicinal killing effect and chemically suppressing and preventing the adhesion growth, the adhesion growth on the concave portion of the strand twist 2B can be significantly suppressed and prevented. Furthermore, in the present invention, since the copper wire 2A is twisted in a spiral manner along the inside of the strand twist 2B, the hardness and rigidity of the copper wire are reduced and the flexibility is not impaired, so that knitting workability can be improved. In addition, the knitted mesh fabric is not bulky and has good handling properties, and the mesh fabric according to the present invention not only has extremely good mesh tightness due to the interposition of the metal wire 1B and the copper wire 2A, but also has a moderate waist. It can be said that it is a yarn for fixed fishing nets that has many advantages such as excellent net structure. Below we report the results of an anti-algae and antifouling test of the current fence net and the fence net of the present invention. A strand with a diameter of 2 mm was created using 56 pieces of 600D polyester monofilament, and the three strands were twisted to form a yarn with a diameter of 4 mm. Current fence net for comparison and polyester monofilament
600D x 55 wires and one aluminum wire with a wire diameter of 0.25mm were mixed and twisted in a Z-twist so that the wire diameter was 2.
A strand with a diameter of 4 mm is obtained by twisting the three strands together in an S twist, and twisting three copper wires with a wire diameter of 0.17 mm within each strand twist. Using original yarn, the mesh is 1 shaku 5 sun.
The fence net of the present invention, which was organized into 100 x 100 pieces, was spread out at a depth of 10 to 30 meters offshore in Manazuru, Sagami Bay for four months, and the state of adhesion of attached organisms was investigated. The results are shown in the table below. The test method was to pull up the net fabric after each period of use, arbitrarily cut out 3 m ² of each net fabric, and measure the average amount of adhesion per 1 m ² . All values in the table are expressed in grams.

[Table] As is clear from the above table, the fence net using the present invention has a high effect of inhibiting the attachment of attached organisms, and in particular, a remarkable effect of inhibiting attachment of shellfish can be seen.

[Brief explanation of drawings]

Figure 1 is a sketch of the strand in this invention.
FIG. 2 is a sectional view of the same, FIG. 3 is a schematic view of the present invention, and FIG. 4 is a sectional view of the same. Explanation of the symbols: 1... Strand, 1A... Yarn, 1B... Metal wire, 2... Raw thread, 2A... Copper wire, 2B... Strand twist.

Claims (1)

[Scope of utility model registration request] A yarn made of natural fiber or synthetic fiber and a metal wire made of tin, nickel, iron, zinc, aluminum, or an alloy thereof and having a wire diameter of 0.1 to 0.5 mm are bonded together so that the metal wire is exposed on its outer surface. Two to four strands mixed and twisted in the Z-twisting direction are twisted together in the S-twisting direction, and a copper wire with a wire diameter of 0.1 to 0.5 mm is spirally twisted along the twist of the strands. A raw yarn for fixed fishing nets characterized by being made of yarn.