JP6148446B2 - Weight for fishing gear and method for manufacturing weight for fishing gear - Google Patents

Description

The present invention relates to a fishing gear weight or a fishing gear weight manufacturing method used as a fishing gear or a part thereof during fishing such as fishing or net fishing. In the present invention, the lure (pseudo bait) used for lure fishing is also included in the concept of “fishing gear weight”. Hereinafter, “fishing gear weight” may be simply referred to as “weight”.

  In the case of fishing such as fishing and net fishing (bottom net fishing, throwing net fishing, etc.), a fishing gear or a part thereof is used as a weight. As the weight, a lead product that is easy to process and inexpensive is common (see, for example, Patent Document 1).

  The weight is lifted from the sea, lake or river water (hereinafter sometimes simply referred to as “seawater or the like”) after use, and used again. However, it may fall off from the fishing line, fishing net, etc. due to rooting, cutting of the fishing line or tying string, deterioration, etc., and left at the bottom of the sea, lakes or rivers (hereinafter simply referred to as “the seabed etc.”). It is often done.

  Historically, lead weights have been used for fishing, and a large amount of lead weights are expected to be left on the seabed at the end of many years. In particular, in popular fishing grounds and good fishing grounds, a large amount of lead weights are expected to accumulate, and some have been confirmed.

  Since lead is highly toxic, its release into the air, soil and water is severely restricted by various laws in Japan. In addition, many of lead and lead compounds are recognized or suspected to be toxic or carcinogenic, and it is imagined that it is not desirable to leave lead on the seabed or the like.

  In this respect, lead forms a strong and stable oxide film on its surface due to oxidation, so further oxidation does not proceed, it does not chemically dissolve in seawater, etc., and it is a living organism in the hydrosphere. Some argue that it will not cause any harm.

  However, it is difficult to know exactly what environmental changes are occurring in seawater where a lot of river water flows or various industrial and domestic wastewater is released. There is an undeniable possibility that the weights made from the chemical will change and be taken up by fish and shellfish.

  In addition, if the abandoned lead weight rubs against stones, rocks, sand, quay walls, embankment walls, wave-dissipating blocks, etc. due to river currents, lakes, and ocean waves, the soft lead from fine particles and It is clear that it becomes a fine granule, and if it is taken into the digestive organs of seafood, it is easily expected to be dissolved by gastric acid and absorbed and accumulated in the body of the seafood.

  It cannot be denied that lead or its compounds accumulated in seafood are taken into the human body in the food chain and eventually cause heavy metal damage.

  On the other hand, iron free from lead damage has recently been used as the material of the weight (see, for example, Patent Document 2). In addition, a technique has also been proposed in which the surface of an iron weight is covered with a biodegradable resin material for the purpose of preventing iron corrosion during use and rubbing and damaging the corners of the knotted string iron (patent) Reference 3).

  Iron is much less harmful than lead, and there are very few problems even if it drops off from fishing lines or fishing nets and is left on the seabed due to rooting or deterioration. On the contrary, in seawater, the amount of phytoplankton has decreased in recent years due to lack of iron, and there is a view that it is desirable to actively supply iron into the sea etc. (Non-patent Document 1, Patent) Reference 4).

  Therefore, using an iron weight contributes to supplying iron, which is an essential mineral for animals and plants, even if it falls off and is left on the seabed. It seems that it should be actively recommended.

  However, iron is known to form an oxide film of trivalent iron on its surface by seawater as well as lead, and although it is not as strong as the surface oxide film of lead, the oxidation occurs in seawater. The membrane significantly slows the elution rate of iron due to oxidation.

  Further, since the elution rate of iron due to oxidation is slow, the weight stays long on the seabed and the like, and even if the weight material is changed to iron, the problem of weight accumulation on the seabed is hardly solved.

  For this reason, compared with the case where the weight is formed from a lump body made of iron base, the shape collapses in a relatively short period of time on the seabed and the like, and the problem of weight accumulation is solved, and There has been a demand for a fishing gear weight that increases the contact area and facilitates effective use of its iron content.

JP 2002-136252 A JP 2011-10647 A JP 2001-292661 A JP 2007-289923 A

Satoshi Hatakeyama, “Iron Prevents Global Warming,” published by Bungei Shunju, June 2008

The present invention is capable of supplying iron, which is an essential mineral of animals and plants, when dropped from fishing lines, fishing nets, etc. and left in the water or bottom of sea, lakes or rivers, and is a lump made of iron base. Compared to the case where a weight is formed from the body, the lump shape collapses in a relatively short period of time on the seabed and the like, and the problem of weight accumulation is solved, and the contact area with seawater is increased, and the iron It is an object of the present invention to provide a fishing gear weight and a method for manufacturing a fishing gear weight in which ions are easily used effectively.

The above-mentioned subject is achieved by the present invention shown below. That is, in the present invention , at least one iron-containing granular material selected from the group consisting of iron , iron oxide, and iron hydroxide, carbon powder, a binder, and a chelating agent are mixed to form a lump. A weight for fishing gear characterized in that it is hardened and molded, and the binder is starch paste.

The above object is further achieved by the present invention described below. That is, the present invention is a mixture of at least one iron-containing granular material selected from the group consisting of iron , iron oxide and iron hydroxide, carbon powder, starch paste as a binder, and chelating agent. And it is a manufacturing method of the weight for fishing gears characterized by solidifying and shape | molding in a lump shape.

  The fishing gear weight of the present invention has a state where a large amount of contact interface between carbon powder having a high electronegativity and a low iron-containing granular material is formed, and the weight for a fishing gear of the present invention exists in seawater or the like. As a result, the anode-cathode reaction is likely to occur at the interface, and there are many reaction points. That is, in the fishing gear weight of the present invention, since a so-called local battery reaction is likely to occur, iron is actively eluted in water.

  Therefore, according to the weight for fishing gear of the present invention, even if it falls off and is left on the seabed or the like, it can be a source of iron ions that tend to be deficient in seawater and is environmentally friendly Rather, it can be preferable. And, the weight for fishing gear of the present invention is much faster than the case where the iron base is left underwater, and when it is left on the seabed etc., it becomes smaller with time and disappears over time. It is possible to suppress or eliminate the problem of weight accumulation in the above.

  In the present invention, in addition to the iron-containing granule and the carbon powder, it is preferable that the binder is further solidified and molded in a state of being mixed with a binder. By adding the binder, it is possible to provide a massive weight that is firmly formed by binding the iron-containing granular material and the carbon powder well.

  Moreover, in this invention, it is more preferable to shape | mold by sintering about what mixed each material and became the mixed state. By sintering, it is possible to provide a massive weight which is much stronger, more durable and molded at a high density. Furthermore, since molding is performed by sintering, at least a part of the carbon powder is oxidized and a hole is formed, so that the weight formed by sintering collapses on the seabed in a relatively short period of time. Thus, the problem of the accumulation of the weight is solved, and at this time, the contact area with seawater or the like is further increased, and the iron content can be more effectively utilized.

It is a schematic block diagram which shows the fishing weight of embodiment which is an illustrative aspect of the weight for fishing gears concerning this invention. It is a graph which shows the change of the water temperature in the tank experiment which investigates the elution amount of iron when the weight for fishing gear concerning the Example of this invention is immersed in artificial seawater. FIG. 2A is a graph showing changes in water temperature in May 2012. FIG. 2B is a graph showing changes in water temperature in June 2012. It is a graph which shows the change of pH of the artificial seawater in the water tank experiment in FIG. FIG. 3A is a graph showing changes in pH in May 2012. FIG. 3B is a graph showing changes in pH in June 2012. It is a graph which shows the change of the salt concentration of the artificial seawater in the tank experiment in FIG. FIG. 4 (a) is a graph showing changes in salt concentration in May 2012. FIG. 4B is a graph showing changes in salt concentration in June 2012. It is a graph which shows the change of the iron content of the artificial seawater in the water tank experiment in FIG.

  Hereinafter, the weight for fishing gear of the present invention will be described in detail with reference to the drawings.

  FIG. 1: is a schematic block diagram which shows the fishing weight of embodiment which is an illustrative aspect of the weight for fishing gears concerning this invention. The fishing weight 10 of the present embodiment includes a weight body 2 that functions as a weight, and a locking tool 4 for locking a fishing line, a float, or a connection fitting connected thereto.

  In this embodiment, the weight main body 2 and the locking tool 4 are formed by integral molding from the same material. Specifically, at least the iron-containing granular material and the carbon powder are mixed and solidified and molded. In the present invention, in addition to the iron-containing granule and the carbon powder, the binder may be mixed and molded into a lump in a mixed state. Moreover, you may mix other components further as needed.

  Hereinafter, details will be described for each component, then the molding method will be described, and finally the reaction in water will be described. In the following description, “%” is simply based on mass unless otherwise specified.

<Iron-containing granular material>
Examples of the iron-containing granular material that can be used in the present invention include iron oxide and iron hydroxide in addition to iron itself.

  Of course, high-purity iron is desirable as iron. However, generally, iron containing impurities (carbon, silicon, phosphorus, etc.) that can be handled as iron materials or alloys with a high iron ratio are used. It doesn't matter. Specifically, the iron content is 20% or less, preferably 10% or less, more preferably 5% or less, even more preferably 2% or less, particularly preferably 1% or less, and the ratio of iron is 85% or more, preferably Is 90% or more, more preferably 93% or more, and particularly preferably 95% or more of an iron alloy.

  On the other hand, as for iron oxide and iron hydroxide, high purity is also desirable, but it may be one containing impurities that are generally handled as iron oxide or iron hydroxide particles (powder). Absent. About preferable purity, it applies to the purity of the iron.

  Iron in iron oxide or iron hydroxide may be trivalent or divalent.

Examples of the iron oxide containing trivalent iron include iron oxide (III) (Fe ₂ O ₃ ), triiron tetraoxide (FeO.Fe ₂ O ₃ ), iron oxyhydroxide (FeOOH), and the like. Examples of iron include iron (II) oxide (FeO) and the like.

On the other hand, ferric hydroxide (FeO (OH)) is used as iron hydroxide containing trivalent iron, and ferrous hydroxide (Fe (OH) ₂ ) is used as divalent iron hydroxide. Can be exemplified.

  In the present invention, the iron-containing granular material refers to iron or iron oxide particles or powder, but it is not meaningful to distinguish between particles and powder. Iron, iron oxide, or iron hydroxide having properties called grains or powders can be suitably used without providing a boundary due to the particle diameter or the like. In addition, the shape of the iron-containing granular material in the present invention includes any shape having various shapes such as a fiber shape and a rod shape whose discussion is divided as to whether it can be included in the category of particles or powders. In the present invention, these are collectively referred to as “iron-containing granules”.

  As the particle size of the iron-containing granule in the present invention, the smaller the value, the higher the reactivity, which is preferable. There is no.

  However, if the particle size of the iron-containing granule is too large, the reactivity will decrease. Conversely, if the particle size is too small, the reactivity will be too high and the stability will decrease. The equivalent sphere diameter in the volume is selected from about 1 μm to 10 mm, preferably about 5 μm to 1 mm, and more preferably about 10 μm to 500 μm. In addition, when the shape of an iron containing granule is fibrous, it is appropriate that the short diameter is the said range, respectively.

  Examples of general materials that can be used as the iron-containing granular material in the present invention include natural or artificial iron powder and sand iron, steel slag generated in steel factories, iron chips and iron grinding powder discharged in various factories, and iron castings. Waste, various other types of scrap iron (iron dust), oxides thereof, disposable warmers, contents before and after use of an antioxidant (iron powder or iron oxide powder), and the like can be used.

<Carbon powder>
Examples of carbon powder that can be used in the present invention include carbon crystalline or amorphous particles. Also in this case, the distinction between grains and powder is not significant, and as with iron-containing granule, it is widely referred to as grain or powder without providing a boundary due to particle size or the like. Carbon having properties can be suitably used. Also, fibrous and rod-like objects are included in the concept of carbon powder in the present invention without problems, as with iron-containing granules. In the present invention, these are collectively referred to as “carbon powder”.

  Specific examples of carbon powder that can be used in the present invention include coke (coal coke, pitch coke, etc.), graphite (regardless of whether artificial or natural), activated carbon, various carbon fibers, and the like. It is not limited to these.

  Among these, those suitable for the carbon powder usable in the present invention are those having a carbon content of 70% or more, more preferably 80% or more, further preferably 90% or more, and particularly preferably 95% or more. Of course, the higher the purity of the carbon, the better.

  The mixing ratio of the carbon powder cannot be increased so much from the viewpoint of securing the specific gravity as a weight, but it is desirable to make the amount more than a certain level in order to secure the reaction point in water.

  Since it depends on the particle size, composition, purity, etc. of the iron-containing granule and carbon powder, the specific mixing ratio of the carbon powder cannot be generally specified, but (iron-containing granule): (carbon powder) Is selected from the range of 98: 2 to 75:25 on a mass basis, with a range of 95: 5 to 80:20 being preferred.

<Binder>
The weight for fishing gear of the present invention can be obtained by mixing, solidifying and molding the iron-containing granular material and carbon powder described above, but in order to solidify the granulated or powdery substance into a lump of sufficient hardness Some means is necessary. For example, it is difficult to ensure the strength to withstand the use as a weight only by pressing and hardening.

  For this reason, it is desirable to further mix the binder for binding the iron-containing granular material and the carbon powder particles to each other, and then to solidify them into a lump. In addition, according to a molding method by sintering described later, the binder can be carbonized during the sintering process to become a supply source of the carbon powder. At this time, it is effective to use a binder in forming a semi-molded product before sintering.

  As the binder, conventionally known pastes (starch paste, rubber paste, etc.), various synthetic adhesives, various natural adhesives, various resins and the like can be used. When the binder remains in the final product, among these, starch pastes with excellent biodegradability, highly biodegradable adhesives, and biodegradable resins are suitable, and are low in cost. Starch paste that is easy to handle is particularly preferred.

  If the amount of binder added is too large and the iron-containing granule or carbon powder seems to be buried, the contact point between the iron-containing granule and carbon powder cannot be secured, so these particles or powders are bound. It is preferable to make the minimum amount possible.

  Since it depends on the particle size of the iron-containing granule and carbon powder, the composition of the binder, and the like, the specific amount of the binder preferably added cannot be generally specified. When the binder is mixed, the mixing ratio of the binder (binder / (iron-containing granule + carbon powder + binder)) is approximately 0.1% by volume to 30% by volume on a volume basis. It is selected from the range, and the range of 0.5 vol% to 10 vol% is preferable.

  In the measurement, the volume of the “binder” corresponding to the numerator of the calculation formula is measured by itself, and the volume of the “iron-containing granular material + carbon powder + binder” corresponding to the denominator is mixed and sufficiently stirred.

<Other ingredients>
In addition to the components described above, various other components can be added to the fishing gear weight of the present invention according to the purpose and necessity.

  For example, various chelating agents may be added for the purpose of stabilizing by chelating iron ions (II) generated after the dissolution reaction in water. Examples of the chelating agent that can be used include EDTA (ethylenediaminetetraacetic acid) and citric acid, and citric acid is particularly preferable because it can form a stable complex with divalent iron ions.

  The amount of the chelating agent to be added is not generally specified, but is selected from a range of approximately 0.001 to 1 part by mass with respect to 100 parts by mass of the iron-containing granule.

  Examples of other various components that can be added to the fishing gear weight of the present invention include known various additives such as colorants, fragrances, and stabilizers. Can be added.

<Shaping the weight>
The weight for fishing gear of the present invention can be obtained by mixing the various materials described above, solidifying the material into a shape as a weight, and molding it. At this time, when the binder is included in the material, the mixture of the materials is put in a mold having a weight shape as shown in FIG. The final product can be obtained simply by taking the necessary curing means. At this time, depending on the type of the binder, it is preferable to use a material mixture appropriately added with a solvent such as water, alcohol, or an organic solvent.

  When a binder is not used, or when it is intended to manufacture a stronger finished product, it is preferable to sinter and mold into a lump after mixing the various materials described above.

  Sintering is a type of conventionally known molding method, and the conditions, methods, and equipment used in the present invention are as conventionally known, but it is required as a weight using a known sintering furnace. Although it has sufficient strength, it depends on the carbon powder content etc. so that the lump shape collapses in a relatively short period when left on the seabed etc., but the temperature condition is 500 ° C. or higher, for example Or 700 ° C. or more, or 1000 ° C. or more, and the upper limit is, for example, 1300 ° C. in consideration of the processing cost or the cost of manufacturing the sintering furnace, and the sintering time is about 10 to 120 minutes, What is necessary is just to perform a sintering process. By this sintering process, a strong and high-density weight can be manufactured.

  At the time of molding, it is put into a mold having a weight shape as shown in FIG. Then, it takes out from a type | mold and is dried by well-known means, such as air drying and hot air drying, as needed. Thereafter, as necessary, molding by sintering is performed as described above.

  The sintering process is usually performed in the presence of oxygen, for example, in the atmosphere. However, when the sintering process is performed at a high temperature, the binder component and carbon powder are oxidized (released as carbon dioxide), and the shape is maintained. Sometimes it doesn't hit. At this time, the sintering process is performed in a non-oxidizing atmosphere (for example, in nitrogen gas or argon gas).

  As described above, the fishing weight of the present invention can be manufactured. The finished fishing weight is of course required to have a higher specific gravity than water, but preferably has a specific gravity with respect to water of 3 or more in order to exhibit its function as a weight. Preferably, it is 5 or more, more preferably 6 or more, and particularly preferably 7 or more. In addition, when molding by sintering is performed, it may be porous. In this case, it is preferable that the true specific gravity is in the above range.

  The finished fishing weight can be attached with other parts, colored and decorated, or written with characters as desired.

  Although the present invention has been described with reference to the preferred embodiment of the fishing weight, the fishing gear weight of the present invention is not limited to the configuration of the embodiment. For example, the shape is not limited to the droplet shape as shown in FIG. 1, but is spherical, rugby ball, cylindrical, prismatic, conical, conical, pyramidal, It can be a pyramid shape, a water droplet shape, an indeterminate shape, or any other various shapes.

  Moreover, in the said embodiment, although the weight main body 2 and the locking tool 4 in the fishing weight 10 shown in FIG. 1 are formed by integrally molding from the same material, both are separated and independent. And can be molded. In this case, if the weight main body 2 is formed by mixing and solidifying the iron-containing granular material and carbon powder characteristic of the present invention into a lump, it is included in the category of the weight for fishing gear of the present invention.

  When the weight main body 2 and the locking tool 4 are molded separately and independently, they are molded with the same material (material characteristic of the present invention) and bonded together by a known method (to be described later, one However, the locking member 4 may be made of other materials.

  When the weight main body 2 and the locking tool 4 are made of different materials, the locking tool 4 can be selected from all materials. For example, in addition to metals such as iron, stainless steel, and aluminum, various resins and other various hard materials can be arbitrarily selected. However, the specific gravity with respect to the water as a whole of the weight main body 2 and the locking tool 4 is desired to be a desired value.

  Of course, when the fishing weight 10 is left on the seabed or the like, environmental considerations are also required for this locking tool 4, so that there are few problems (more preferably, no problem) even if left untreated. For example, iron, biodegradable resin, the same material as a fishing line or a knot, and the like are preferable materials.

  In the above case, the weight for fishing gear according to the present invention corresponds to the portion of the weight main body 2 that is required to have a high specific gravity with respect to water, and the locking tool 4 is regarded as an accessory. Of course, this is not the case when integrally molded as in this embodiment.

  In the above embodiment and the above modification, the fishing weight has been described as an example. However, the fishing gear weight of the present invention can be widely used as various weights used as fishing gear, for example, a stationary net, a bottom rod net, It can also be used as a weight (fishing net weight) for use in fishing nets such as throwing nets. Even in this case, the shape shown in FIG.

  Moreover, the weight for fishing gear of this invention can be used as a lure by shape | molding in the shape of a lure (pseudo bait), and coloring as needed. The lure is also included in the category of the fishing gear weight of the present invention and can be manufactured in the same manner as the fishing weight or fishing net weight.

  In addition, those skilled in the art can appropriately modify the fishing gear weight of the present invention in accordance with conventionally known knowledge. Of course, such modifications are also included in the scope of the present invention as long as the construction of the fishing gear weight of the present invention is provided.

<Production of weight sample for fishing gear>
The raw materials shown in Table 1 were used for the production of fishing tackle weight samples. These raw materials are uniformly mixed at the blending ratios shown in Table 1, respectively, and each is a water drop shape having a length of about 80 mm and a thickness of about 35 mm, and an intermediate product provided with a locking tool with an iron wire on the tip side. Three types were prepared.

  After these intermediate products were dried indoors for 7 days, they were sintered in the electric furnace (F0200) manufactured by Yamato Kagaku at the temperature shown in Table 1 for about 2 hours, respectively. Got.

<Water tank experiment>
Iron elution experiments from these fishing gear weights 1 to 3 were carried out in a water tank installed indoors as follows during the period from May 4 to July 18, 2012.

  Two experimental water tanks (45 cm standard water tanks. 24 L (manufactured by Marcan Nisso Division)) were prepared. One of the tanks (hereinafter referred to as “A tank” or “A”) is laid with Oiso gravel (10 kg), and then the artificial seawater (Sea Life (SEALLIFE) manufactured by Nihonkaisui Co., Ltd.) is at the top of the tank. To the other water tank (hereinafter referred to as “B water tank” or “B”), and after putting the large coral gravel and artificial seawater in the same manner, the above fishing gear is placed on the large coral gravel. The weights A to C were placed. Throughout the test period, air was bubbled against artificial seawater in these tanks using an air pump “Shizu” manufactured by Marcan (Nisso Division).

  After the start of the test (May 4, 2012) and until June 28, the temperature and pH of the artificial seawater in each aquarium are measured every day or every 3 days (Malfeed) ) And salt concentration (according to a salt concentration meter manufactured by Sekisui Polymertech Co., Ltd. However, salt concentration data is not measured after June 11 due to failure of the salt concentration meter). In addition, a small amount of artificial seawater was collected from both tanks three times on May 14th on the 11th day after the start of the experiment, June 19th on the 47th day, and June 28th on the 56th day, The iron content was examined (ICP mass spectrometry (ICP-SF-MS) (analysis by the Faculty of Marine Science, Tokyo University of Marine Sciences)).

  Furthermore, on May 14th, two red sea bream (both approximately 80 g) are placed in the tank B, and then for 66 days the breeding feed (OMEGA ONE) -"Pellets"), and the iron content per 100 g body weight was measured for one of them on July 3 after 51 days and for the other one on July 18 after 66 days (red sea bream) The whole body is ground into a sample and measured by atomic absorption (Vision Bio).

<Evaluation results>
Regarding the results of the survey on the temperature of the artificial seawater in the tanks A and B during the above period, the results in May are shown in FIG. 2 (a), and the results in June are shown in FIG. 2 (b). From these, it was confirmed that there was no big difference in the water temperature change between both tanks.

  Moreover, about the investigation result with respect to pH of the artificial seawater in the tank A and B, the result in May is shown to Fig.3 (a), and the result in June is shown in FIG.3 (b), respectively. It was confirmed that there was no big difference in the liquid temperature change between both water tanks.

  Furthermore, about the investigation result with respect to the salt concentration of the artificial seawater in the tank A and B, the result in May is shown to Fig.4 (a), and the result in June is shown in FIG.4 (b), respectively. It was confirmed that there was no significant difference in the change in salt concentration between the two tanks.

  The change in the iron content of the artificial seawater is shown in FIG. In the artificial seawater in the tank A, the measurement results were less than the detection limit (0.0037 ppm) in all three measurements, but in the artificial seawater in the tank B, the iron content increased with time, more than 70 times the initial value of the experiment. It was suggested that the iron concentration increasing effect of seawater can be obtained by the weight for fishing gear according to the present invention.

  On July 18, the fishing gear weights 1 to 3 were pulled up and observed. All fishing gear weights were broken into 3 to 4 small clumps, and black powder was generated when touched by hand, and progress of embrittlement was confirmed.

  As for red sea bream, no abnormalities were observed during the breeding period, and the body iron content was 0.6 mg per 100 g body weight in individuals collected on July 3, but 100 g in individuals collected on July 18th. It was 1.2 mg per unit, which was doubled in about 2 weeks.

  From the above, it was found from the experimental results using artificial seawater that iron is effectively supplied into the seawater by the weight for fishing gear according to the present invention. This is because even if the weight remains on the seabed or the like due to fishing roots or operation mistakes, the mass shape collapses in a relatively short period of time, and the problem of weight accumulation on the seabed is solved, and as a result of the collapse, It was confirmed that iron can be quickly supplied to seawater and the like, and that the iron is useful for the growth of seafood.

2: Weight body 4: Locking tool 10: Fishing weight (fishing gear weight)

Claims (2)

An iron- containing granule composed of at least one selected from the group consisting of iron , iron oxide and iron hydroxide, carbon powder, a binder, and a chelating agent are mixed and molded into a lump, and molded.
A weight for fishing gear, wherein the binder is starch paste. An iron- containing granule composed of at least one selected from the group consisting of iron , iron oxide and iron hydroxide, carbon powder, starch paste as a binder, and chelating agent are mixed together and solidified into a lump. A method for producing a weight for fishing gear, characterized by molding.

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