Fishing bait

Abstract

This product provides fishing bait in which the components of the bait are easily released to the outside. [Solution] The fishing bait 1 comprises a first base material 10 having a first main surface 100 and a second main surface 110 opposite to the first main surface 100, and a second base material 20 provided attached to the second main surface 110 of the first base material 10, having a baiting material as its main component and also containing polyvinyl alcohol.

Description

Technical Field

[0001] The present invention relates to fishing bait. In particular, the present invention relates to flat fishing bait.

Background Art

[0002] Conventionally, there is known a fish feed comprising an outer layer constructed by a heat gel of protein and / or starch and an inner layer comprising a composition containing nutritional components with fish meal and oil as essential components, wherein the oil in the inner layer is an oil containing fish oil and a hardened oil having a melting point of 50°C or higher (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional feed described in Patent Document 1 and the like, since the composition containing nutritional components is present in the inner layer and the inner layer is covered by the outer layer, it is difficult for the nutritional components to be released to the outside.

[0005] Therefore, an object of the present invention is to provide a fishing bait in which the components of the feeding material are easily released to the outside.

Means for Solving the Problems

[0006] In order to achieve the above object, the present invention provides a fishing bait comprising a first base material mainly composed of polyvinyl alcohol and having a first main surface and a second main surface opposite to the first main surface, and a second base material provided by being joined to the second main surface of the first base material, the second base material being mainly composed of a feeding material and containing polyvinyl alcohol.

Effects of the Invention

[0007] The fishing bait according to the present invention provides a fishing bait in which the components of the bait are easily released to the outside. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram of fishing bait according to this embodiment. [Figure 2] This is a schematic diagram of fishing bait according to another example of this embodiment. [Modes for carrying out the invention]

[0009] [Embodiment] <Overview of fishing bait 1> The fishing bait 1 according to this embodiment is substantially flat in shape and has a laminated structure consisting of a layer that mainly holds the hook and the like, and a layer that is partially exposed to the outside and mainly releases the components of the feeding material to the outside. Conventionally, to prevent the bait from immediately dispersing into the water when fish bait attached to a hook is thrown into the water, the components containing the feeding material were coated with a predetermined material so that the components containing the feeding material were on the inside. However, with such a configuration, the feeding material does not easily disperse into the water. On the other hand, if the components containing the feeding material are simply exposed to the outside in order to make it easier for the feeding material to disperse into the water, the components containing the feeding material do not solidify easily in the first place, making it difficult to attach to the hook, and when thrown into the water, the feeding material disperses into the water immediately, making it difficult to use as fishing bait.Therefore, the inventors have considered various structures and compositions for fishing bait that can be easily attached to a hook and the like, and that allows the feeding material to continue to disperse into the water over a certain period of time when thrown into the water, and as a result have come up with the idea for the fishing bait according to this embodiment.

[0010] In other words, the fishing bait 1 according to this embodiment comprises a first base material having a first main surface and a second main surface opposite to the first main surface, and a second base material provided attached to the second main surface of the first base material, having a feeding material as its main component and containing polyvinyl alcohol.

[0011] In fishing bait 1, which has the above configuration, the first base material is made mainly of a polymer material that easily maintains its shape even in water, so it maintains its structure even if a fishing hook or the like is pierced into the first base material. On the other hand, the second base material is made mainly of a feeding material and is in the shape of a flat plate, and one side is attached to one side of the first base material, so one side of the second base material is not exposed to water, and the other side is exposed to water. Furthermore, since the second base material is made of the same material as the first base material, one side of the first base material and one side of the second base material are joined (i.e., fused) together as an integral part. The second base material contains the same material as the first base material and contains a feeding material as the main component to the extent that it maintains its shape as a base material when formed into a layer, so it maintains its shape in the same way as the first base material. As a result, with fishing bait 1, when cast into water, the feeding material diffuses into the water from the other side of the second base material, while the shape of the entire fishing bait 1 is maintained in the water. Therefore, with fishing bait 1, the bait components remain properly attached to the hook for a predetermined period of time after being cast into the water, and continue to disperse into the water, thus promising good fishing results.

[0012] <Details of fishing bait 1> Figure 1 shows an overview of the structure of an example of fishing bait according to this embodiment. Specifically, Figure 1(a) shows an overview of an example of a plan view (upper side of Figure 1(a)) and a side view (lower side of Figure 1(a)) of fishing bait 1, and Figure 1(b) shows an overview of the virtual circumscribed circle of fishing bait 1 in a plan view of fishing bait 1.

[0013] (Composition of fishing bait 1) As shown in Figure 1(a), the fishing bait 1 comprises a first base material 10 and a second base material 20 joined to one side of the first base material 10. The first base material 10 and the second base material 20 are joined to each other in a joining region 30. The fishing bait 1 is flat or thin plate-shaped and has a predetermined shape when viewed from above.

[0014] (Shape and size of fishing bait 1) The shape and size of the fishing bait 1 are not particularly limited as long as it is flat or thin. However, the shape and / or size may be adjusted as appropriate depending on the type of fish being caught. Furthermore, the shape of the fishing bait 1 can be any shape that can form a virtual circumscribed circle 5 in a plan view, as shown in Figure 1(b). For example, the shape of the fishing bait 1 can be a rectangle, a triangle (equilateral triangle, right triangle, isosceles triangle, etc.), an ellipse, a trapezoid, a star shape, a polygon, or an irregular shape. The size of the fishing bait 1 is also not particularly limited, but for example, if the shape of the fishing bait 1 is a right triangle, the base may be about 2.5 cm, the height about 13 cm, and the thickness about 1.2 cm.

[0015] (1st base material 10) The shape of the first base material 10 is the same as the shape of the fishing bait 1 described above. Also, the size of the first base material 10 is the same as the size of the fishing bait 1 described above, except for the thickness. There are no particular limitations on the thickness of the first base material 10, but it may be the same thickness as or thinner than the thickness of the second base material 20 described later, for example, it may be about 4 mm.

[0016] The main component of the gelling agent in the first substrate 10 is polyvinyl alcohol, and it has a first main surface 100 and a second main surface 110 opposite to the first main surface 100. In this specification, "main component is polyvinyl alcohol (or a water-soluble polymer)" means that the proportion (content) of polyvinyl alcohol in the first substrate 10 exceeds 3 wt% of the total weight of the first substrate 10.

[0017] In this embodiment, the concentration of polyvinyl alcohol in the first base material 10 is preferably 3 wt% or more and less than 20 wt%, more preferably 8 wt% or more and less than 15 wt%, from the viewpoint of improving the hook holding property of the fishing bait 1. In addition, from the viewpoints of improving moisture retention and physical properties, the first base material 10 may contain a predetermined alcohol (such as propylene glycol and / or glycerin) at about 3 wt% or more and 10 wt% or less in addition to polyvinyl alcohol. Further, in addition to polyvinyl alcohol, the first base material 10 may contain a water-soluble polymer selected from the group consisting of xanthan gum, locust bean gum, carrageenan, guar gum, sodium alginate, gellan gum, psyllium seed gum, and agar.

[0018] (Second base material 20) The shape of the second base material 20 is the same as the shape of the fishing bait 1 in the above description. Also, the size of the second base material 20, excluding the thickness, is the same as the size of the fishing bait 1 in the above description. And although there is no particular limitation on the thickness of the second base material 20, it may be the same thickness as or thicker than the thickness of the first base material 10, for example, about 8 mm.

[0019] The second base material 20 contains a bait material as a main component and contains polyvinyl alcohol, and has a first main surface 200 and a second main surface 210 opposite to the first main surface 200. And the second main surface 210 of the second base material 20 joins to the second main surface 110 of the first base material 10. And it is configured such that the surface on the side opposite to the side joined to the first base material 10 of the second base material 20 (that is, the first main surface 200) is exposed to the outside. In this specification, containing a bait material as a main component means that the ratio (content ratio) of the bait material (or bait material component) in the second base material 20 exceeds 30 wt% with respect to the total weight of the second base material 20.

[0020] The bait material contained in the second base material 20 can be appropriately determined according to the fish species targeted for fishing. For example, the bait material may contain at least one bait material selected from the group consisting of animals and plants generally used as fishing bait (animals and plants for fishing bait) and aquatic organisms.

[0021] In this embodiment, the concentration of the feeding material in the second base material 20 is preferably 30 wt% or more and less than 90 wt% from the viewpoint of facilitating the diffusion of the feeding material into water while maintaining the form of the second base material 20 even when the feeding material is contained. And the concentration of polyvinyl alcohol in the second base material 20 is preferably 0.5 wt% or more and less than 10 wt%, more preferably 1 wt% or more and less than 5 wt% from the viewpoint of maintaining the form of the second base material 20 in the fishing bait 1. In addition, similar to the first base material 10, the second base material 20 can also contain a predetermined alcohol in an amount of about 3 wt% or more and 10 wt% or less in addition to polyvinyl alcohol, and in addition to polyvinyl alcohol, xanthan gum, locust bean gum, carrageenan, guar gum, sodium alginate, gellan gum, psyllium seed gum, agar, etc. It may contain a water-soluble polymer selected from the group consisting of.

[0022] (Bonding region 30) Here, the polyvinyl alcohol that is the main component of the first base material 10 and the polyvinyl alcohol of the second base material 20 are the same material. And structures made of polyvinyl alcohol are easily joined and fused with each other. Therefore, the first base material 10 and the second base material 20 are joined / fused in the bonding region 30, and the first base material 10 and the second base material 20 are in an inseparable state. That is, the second main surface 110 of the first base material 10 and the second main surface 210 of the second base material 20 are joined and become inseparable in the bonding region 30. This is because the polyvinyl alcohol of the first base material 10 and the polyvinyl alcohol of the second base material 20 are bonded to each other by hydrogen bonds or the like in the portion of the bonding region 30. As a result, the first base material 10 and the second base material 20 are joined inseparably in the bonding region 30.

[0023] (Polyvinyl alcohol) There are no particular limitations on the polyvinyl alcohol used in the first base material 10 and the second base material 20. However, from the viewpoint of providing the fishing bait 1 with good hook-holding properties, for example, an average degree of polymerization calculated by the viscosity method is preferably 300 or higher, more preferably 2,500 or higher, and even more preferably 4,000 or higher. Furthermore, from the viewpoint of providing a certain degree of flexibility, it is preferably 4,500 or lower, more preferably 4,000 or lower, and even more preferably 3,300 or lower.

[0024] Furthermore, there are no particular limitations on the degree of saponification of polyvinyl alcohol, but from the viewpoint of allowing fishing bait 1 to exhibit a certain degree of flexibility, etc., it is preferable to have 70 mol% or more, more preferably 90 mol% or more, and even more preferably 95 mol% or more.

[0025] (Relationship between the diameter of the circumscribed circle of the triangular fishing bait 1 in a plan view and the thickness of the fishing bait 1) The fishing bait 1 according to this embodiment can have various shapes such as squares and polygons. For example, the fishing bait 1 may be triangular in plan view, as shown in Figure 1(a). In the triangular fishing bait 1 according to this embodiment, from the viewpoint of strengthening the bond between the first base material 10 and the second base material 20 and suppressing the peeling of the second base material 20 from the first base material 10, as shown in Figure 1(b), it is preferable that the ratio t / D of the total thickness t of the first base material 10 and the second base material 20 with respect to the diameter D of the circumscribed circle 5 of the first base material 10 (or fishing bait 1 or second base material 20) in plan view is less than 1, and is also preferable to be 0.5 or less. By satisfying this relationship in the ratio t / D, when the fishing bait 1 is cast into the water and a fish bites the fishing bait 1, it is possible to suppress the peeling of the first base material 10 and the second base material 20.

[0026] Furthermore, as shown in Figure 2, for example, if the shape of the first substrate 10 in plan view is a polygon in this embodiment (Figure 2 shows an example of a heptagon with a depression), then, as long as a virtual circle can be formed that includes at least two vertices selected from the plurality of vertices of the first substrate 10, then, for example, not all vertices of the polygonal first substrate 10 do not have to lie on the circumference of the virtual circle (in the example in Figure 2, a virtual circle (virtual circle 7) is formed by vertices 60 and 62, and the other vertices, excluding vertices 60 and 62, do not lie on the virtual circle 7). In this case, L is the distance between two points on a line segment that has the longest length among the line segments that connect two points selected from the plurality of vertices of the first substrate 10 located on the circumference of the virtual circle and / or the intersection points of the virtual circle and the sides of the first substrate 10 (i.e., the sides of the polygon). As an example, in Figure 2, vertices 60 and 62 of the first base material 10 lie on a virtual circle 7, and intersections 70, 72, 74, and 76 exist where the virtual circle 7 intersects with the edges of the first base material 10. Therefore, in Figure 2, the distance L is the distance between vertex 62, where the line segment is longest, and intersection 70. Preferably, the ratio t / L of the distance L to the total thickness t of the first base material 10 and the second base material 20 is less than 1, and preferably 0.5 or less. By satisfying the relationship of the ratio t / L, when the fishing bait 1 is cast into the water and a fish bites the fishing bait 1, the separation of the first base material 10 and the second base material 20 can be suppressed.

[0027] (Bonding strength between the first substrate 10 and the second substrate 20) The sufficient bonding of the second base material 20 to the first base material 10 can be confirmed by the presence or absence of delamination when measured in a tensile test on a rheometer. The fishing bait 1 is cut into a 1 cm square in a plan view, and a fishing hook is inserted into a predetermined position on the first base material 10 of the cut fishing bait 1, and also into a predetermined position on the second base material 20. Then, one end of the fishing line attached to the fishing hook on the first base material 10 side and the other end of the fishing line attached to the fishing hook on the second base material 20 side are fixed to the connection part of the rheometer, and a tensile test is performed at a predetermined tensile speed. This confirms whether the bonding strength is sufficient by confirming that the bonded part does not peel off and that it tears from the pin-pierced part of the second base material 20.

[0028] (Elasticity of the first substrate 10 and the second substrate) In this embodiment, both the first substrate 10 and the second substrate 20 are solidified bodies. That is, from the viewpoint of making it easier to attach a fishing hook to the fishing bait 1 and maintaining its shape sufficiently in water, the gel strength (jelly strength) of the first substrate 10 measured by a rheometer is quantified by the breaking strength (N) or maximum stress (N) obtained by a compression test, and is preferably 13 (N) or more, and more preferably 17 (N) or more. Similarly, the gel strength of the second substrate 20 measured by a rheometer is preferably 4 (N) or more, and more preferably 5 (N) or more. Furthermore, in this embodiment, it is preferable that the gel strength of the first substrate 10 is greater than that of the second substrate 20, and the difference between the gel strength of the first substrate 10 and the gel strength of the second substrate 20 is preferably 9 (N) or more, and preferably 50 (N) or less.

[0029] <Effects of the Embodiment> In this embodiment, the fishing bait 1 consists of a first base material 10, which is mainly composed of polyvinyl alcohol, and a second base material 20, which is mainly composed of a feeding material and also contains polyvinyl alcohol to maintain its layered shape, which is bonded to the first base material 10 at a predetermined surface. Therefore, when the fishing bait 1 is thrown into water, the feeding material components can easily diffuse into the water from the surface of the second base material 20 that is not bonded to the first base material 10. Furthermore, since both the first base material 10 and the second base material 20 in the fishing bait 1 contain polyvinyl alcohol, the first base material 10 and the second base material 20 are inseparably bonded together at a predetermined surface. Therefore, in the fishing bait 1, even when the fishing bait 1 is thrown into water or when a fish bites it, the separation of the second base material 20 from the first base material 10 can be suppressed. Experimental Example

[0030] The following provides further details with experimental examples. It goes without saying that these examples are illustrative and should not be interpreted restrictively.

[0031] (Experimental Example 1) As a sample for Experimental Example 1, a sample with a triangular shape in plan view, with a base of 2.5 cm and a height of 13 cm, was prepared as follows: A predetermined amount of polyvinyl alcohol and water were mixed and heated to melt, then xanthan gum dispersed in propylene glycol and glycerin was added. After reheating, it was frozen (minus 23°C) and thawed to prepare a first base material 10 with a polyvinyl alcohol concentration of 9.0 wt% (thickness 4 mm). Similarly, a second base material 20 was prepared by mixing the first base material 10, which was prepared separately, with a feeding material (sardine mince) to create a second base material 20 with a feeding material concentration of 66.6 wt% and a polyvinyl alcohol concentration of 3.0 wt% (thickness 8 mm). Subsequently, the second base material 20 was bonded to the first base material 10 by overlapping one side of the second base material 20 onto one side of the first base material 10, thereby obtaining a fishing bait sample for Experimental Example 1.

[0032] Furthermore, in the same manner as in Experimental Example 1, samples for Experimental Examples 2 and 3, as well as comparative product A, were prepared by changing the polyvinyl alcohol concentrations of the first substrate 10 and the second substrate 20, respectively. Specifically, in the sample for Experimental Example 2, the polyvinyl alcohol concentration of the first substrate 10 was 8.5 wt%, and the polyvinyl alcohol concentration of the second substrate 20 was 2.8 wt%. In the sample for Experimental Example 3, the polyvinyl alcohol concentration of the first substrate 10 was 8.0 wt%, and the polyvinyl alcohol concentration of the second substrate 20 was 2.6 wt%. In the sample for comparative product A, the polyvinyl alcohol concentration of the first substrate 10 was 8.5 wt%, and the polyvinyl alcohol concentration of the second substrate 20 was 2.8 wt%. However, the sample for comparative product A has a form in which the first substrate is bonded to both sides of the second substrate, and its structure differs from that of the samples for Experimental Examples 1 to 3. Furthermore, as a comparative sample (comparative sample B) for tensile testing, a sample was prepared in which the polyvinyl alcohol component of the first substrate 10 was replaced with an agar material (prepared with an agar material concentration of 1 wt%).

[0033] <Tensile Test> For Experimental Example 1, a fishing hook (manufactured by Hayabusa Co., Ltd., product name: Kyogi Kiss No. 7) was inserted into the center of the first substrate 10 of the sample, and another fishing hook (manufactured by Hayabusa Co., Ltd., product name: Kyogi Kiss No. 7) was also inserted into the center of the second substrate 20. One end of the fishing line attached to the fishing hook on the first substrate 10 and the other end of the fishing line attached to the fishing hook on the second substrate 20 were fixed to the mounting part of a rheometer (manufactured by Sun Science Co., Ltd., rheometer CR-500DX), and a tensile test was performed under the conditions of a tensile speed of 300 mm / min and a sample elongation of 25 mm. The same tensile tests were also performed on the samples for Experimental Examples 2 and 3, and on the comparative samples (comparative product A and comparative product B).

[0034] <Gel Strength Test> The gel strengths of the first substrate 10 and the second substrate 20 of the sample related to Experimental Example 1 were measured as follows.

[0035] For the first substrate 10 of the sample related to Experimental Example 1, the gel strength was measured using a rheometer (CR-500DX rheometer manufactured by Sun Science Co., Ltd.) under the following conditions. ·Measurement speed: 60mm / min • 10mm diameter cylindrical plunger • Maximum load: 100N ·Environmental temperature: 22.6℃

[0036] The gel strength of the second substrate 20 of the sample in Experimental Example 1 was similarly measured. The gel strength of the samples in Experimental Examples 2 and 3 was also measured in the same manner. The gel strength of the first substrate 10 and the second substrate 20 of comparative product A and comparative product B were also measured. In comparative product B, the gel strength of the first substrate 10, which is made of agar material, was measured.

[0037] <Measurement of the concentration of feeding material dispersed in water> The sample for Experimental Example 2 was placed in water, and the change in the concentration of the feeding material in the water before and after sample introduction was measured. Specifically, the entire sample for Experimental Example 2, in which a sheet of 8g (equivalent to 5.336g of feeding material) of the second base material 20 was bonded to one side of a sheet of the first base material 10 (4g), was placed in 0.4L of 3.4% saline solution at 21.7°C, left to stand for 2 minutes, and then the sample was collected. The concentration of the feeding material in the water after sample introduction was confirmed by measuring the amount of amino acids. (The amount of amino acids in the water before sample introduction was 0.0g / 1g of water.) The concentration of the feeding material when the standing time in the saline solution was extended to 5 minutes was also measured. The feeding material concentration in the saline solution was similarly measured for the comparative sample (Comparative Sample A) at standing times of 2 minutes and 5 minutes.

[0038] In Experiment Example 2, the sample has a structure in which an 8g sheet of the second base material is bonded to one side of a 4g sheet of the first base material, so that one side of the second base material is exposed when it is placed in water. On the other hand, in the comparative sample (comparative product A), the first base material is bonded and molded to both sides of the second base material so that neither side of the second base material is exposed to water. In other words, in comparative product A, the second base material has a structure in which it is sandwiched between two first base materials. Therefore, in the second base material of comparative product A, only the side is exposed to water, and comparative product A has a structure in which the bait material is less likely to diffuse into the water compared to the sample in Experiment Example 2. That is, with fishing bait 1 corresponding to the sample in Experiment Example 2, when it is placed in water, the bait material easily diffuses into the water from the other side of the second base material (the side not bonded to the first base material), and because one side of the second base material is bonded to the first base material, the first base material supports the second base material, so the overall shape of fishing bait 1 can be maintained in water.

[0039] The amount of amino acids was measured specifically as follows. First, 0.4 L of 3.4% salt water was placed in each of the four beakers (beakers 1 to 4). Next, the sample from Experimental Example 2 was placed in beaker 1 so that it was completely submerged and left to stand for 2 minutes. Similarly, the sample from Comparative Product A was placed in beaker 2 so that it was completely submerged and left to stand for 2 minutes. Then, the sample from Experimental Example 2 in beaker 1 and the sample from Comparative Product A in beaker 2 were removed after standing for 2 minutes. The sample from Experimental Example 2 removed from beaker 1 was placed in beaker 3 so that it was completely submerged and left to stand for 3 minutes before being removed. In the same way, the sample from Comparative Product A removed from beaker 2 was placed in beaker 4 so that it was completely submerged and left to stand for 3 minutes before being removed. Subsequently, the amino acid concentrations in the saline solution were measured in the following beakers: the first beaker (sample from Experimental Example 2, standing for 2 minutes), the second beaker (sample from Comparative Product A, standing for 2 minutes), the third beaker (sample from Experimental Example 2, standing for 3 minutes), and the fourth beaker (sample from Comparative Product A, standing for 3 minutes). The amino acid concentrations were measured using the Prominence amino acid analysis system manufactured by Shimadzu Corporation.

[0040] Table 1 shows each experimental example and its measurement results. Note that the gel strength of the first substrate 10 of comparative product B represents the gel strength of the first substrate 10 containing 1% agar material.

[0041] [Table 1]

[0042] Table 2 also shows the measurement results of the concentration of the feed material diffused in the water. Note that in Table 2, the measured amino acid content for Experimental Example 2 and Comparative Product A after 5 minutes of standing is the sum of the measured value after 2 minutes of standing and the measured value after 3 minutes of standing.

[0043] [Table 2]

[0044] In Table 2, the amount of amino acids in water is expressed as the mass (g) per 1g of water. Also, Asp refers to aspartic acid, Thr to threonine, Ser to serine, Asn to asparagine, Glu to glutamic acid, Gln to glutamine, Pro to proline, Gly to glycine, Ala to alanine, Val to valine, (Cys)2 to cystine, Met to methionine, Ile to isoleucine, Leu to leucine, Tyr to tyrosine, Phe to phenylalanine, Trp to tryptophan, His to histidine, Lys to lysine, Arg to arginine, and Taurine to taurine. The ratio of the amount eluted by comparative product A was calculated as "amount of amino acids in water in experimental example 2 / amount of amino acids in water in comparative product A".

[0045] As can be seen in Table 1, in the sample for Experimental Example 1, the tensile test showed that the joint did not peel off, and the second substrate tore from the pinch point. The joint strength at that time was 18.6 N. Here, the gel strength of the first substrate 10 in the sample for Experimental Example 1 was 52.7 N, and the gel strength of the second substrate 20 was 10.1 N, indicating that the first substrate 10 and the second substrate 20 were firmly bonded, and that both the first substrate 10 and the second substrate 20 were solidified bodies. Furthermore, as can be seen in Table 2, in the sample for Experimental Example 2, the feeding material diffused more easily into the water when placed in water compared to the comparative sample (comparative product A), as shown by the measurement of the amino acid content in the water after the sample was placed in water. Specifically, regardless of whether the standing time was 2 minutes or 5 minutes, the amount of amino acids diffused into the water from the sample for Experimental Example 2 was approximately four times the amount of amino acids diffused into the water from comparative product A. Furthermore, in the tensile test of the sample related to Experimental Example 2, the second substrate was observed to tear without delamination at the joint. The joint strength at that time was 15.1 N. Here, the gel strength of the first substrate 10 of the sample related to Experimental Example 2 was 32.6 N, and the gel strength of the second substrate 20 was 7.8 N, which similarly indicates that the first substrate 10 and the second substrate 20 were firmly bonded, and that both the first substrate 10 and the second substrate 20 were solidified bodies. The same results were also shown in the sample related to Experimental Example 3 as in Experimental Example 2. However, in the tensile test, the bonded product with agar material prepared as a comparative example (comparative product B) delaminated at the joint, and the joint strength could not be measured.

[0046] Although embodiments and experimental examples of the present invention have been described above, the embodiments and experimental examples described above do not limit the invention as defined in the claims. Furthermore, it should be noted that not all combinations of features described in the embodiments and experimental examples are necessarily essential for solving the problem of the invention.

[0047] Furthermore, the fishing bait according to this embodiment can also be referred to in the following supplementary information, which should not be confused with the claims.

[0048] (Additional note 1) A first substrate having a water-soluble polymer as its main component and a first main surface and a second main surface opposite to the first main surface, A second substrate is provided bonded to the second main surface of the first substrate, and the second substrate mainly consists of a feeding material and also contains the water-soluble polymer. Fishing bait that has the following features. (Additional note 2) The fishing bait according to Appendix 1, wherein the water-soluble polymer that is the main component of the first substrate and the water-soluble polymer contained in the second substrate are made of the same material, so that the first substrate and the second substrate are joined together inseparably. (Additional note 3) The fishing bait according to Appendix 1, wherein the water-soluble polymer is polyvinyl alcohol. (Additional note 4) The fishing bait according to Appendix 3, further comprising at least one or more of the following in addition to the water-soluble polymer: xanthan gum, locust bean gum, carrageenan, guar gum, sodium alginate, gellan gum, psyllium seed gum, and agar. (Additional note 5) It contains polyvinyl alcohol as its main component, and has a roughly triangular first layer (needle-holding layer) when viewed in plan, The second layer (feeding material layer, ingestion layer) contains polyvinyl alcohol and mainly contains a feeding material, is roughly triangular in shape when viewed from above, is bonded to the main surface of the first layer, and the surface opposite to the side bonded to the first layer is exposed to the outside. Fishing bait that has the following features. [Explanation of symbols]

[0049] 1 Fishing bait 5. Circumscribed circle 7 Virtual Yen 10 First base material 20 Second base material 30 Joint area 60, 62 vertices 70, 72, 74, 76 intersection 100 First Main Surface 110 Second Main Surface 200 First Main Surface 210 Second Main Surface

Claims

1. A first substrate having polyvinyl alcohol as its main component and having a first main surface and a second main surface opposite to the first main surface, A second substrate is provided bonded to the second main surface of the first substrate, and the second substrate mainly consists of a feeding material and also contains polyvinyl alcohol. Fishing bait that has the following features.

2. The fishing bait according to claim 1, wherein the polyvinyl alcohol that is the main component of the first base material and the polyvinyl alcohol of the second base material are made of the same material, and the first base material and the second base material are joined together inseparably.

3. The fishing bait according to claim 1, wherein the concentration of the polyvinyl alcohol in the first base material is 3 wt% or more and less than 20 wt%, and the concentration of the polyvinyl alcohol in the second base material is 0.5 wt% or more and less than 10 wt%.

4. The fishing bait according to claim 1, wherein the feeding material contains at least one bait material selected from the group consisting of aquatic organisms and plants and animals used as fishing bait.

5. The fishing bait according to claim 1, wherein the surface of the second base material opposite to the side joined to the first base material is exposed to the outside.

6. The gel strength of the first substrate, as measured by a rheometer, is 13 (N) or higher. The fishing bait according to claim 1, wherein the gel strength of the second substrate, as measured by a rheometer, is 4 (N) or more.

7. The first substrate is triangular in plan view, The fishing bait according to claim 1, wherein the ratio t / D of the total thickness t of the thickness of the first substrate and the thickness of the second substrate to the diameter D of the circumscribed circle of the first substrate in a plan view of the triangular first substrate is less than 1.

8. The first substrate is polygonal in plan view, The fishing bait according to claim 1, wherein L is the distance between two points selected from a plurality of vertices of the polygon located on a virtual circle containing at least two vertices of the polygon and the intersection points of the virtual circle and the polygon, and the ratio t / L of the total thickness t of the thickness of the first base material and the thickness of the second base material to L is less than 1.

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