Hydroponic cultivation panel and method for manufacturing a hydroponic cultivation panel

Abstract

To provide a hydroponics panel that can promote plant growth while ensuring panel strength, and to provide a method for manufacturing the hydroponics panel.SOLUTION: Provided is a hydroponics panel 10 provided with a plurality of holes 20, each of the holes 20 comprising: a top surface side opening 32 that opens on a top surface 10a side of the hydroponics panel 10 into which a plant is inserted; and a lower surface side opening 42 that communicates with the upper surface side opening 32 and opens on a lower surface 10b side of the hydroponics panel 10 and has a shape that gradually expands in diameter toward the lower surface 10b side, and being hollow inside, the upper surface side opening 32 being formed by bending a part of the upper surface 10a inward, the lower surface side opening 42 being formed by bending a part of the lower surface 10b inward, and at least the upper surface 10a side being made of a non-foam material.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a hydroponic cultivation panel and a method for manufacturing the hydroponic cultivation panel.

Background Art

[0002] Conventionally, panels for hydroponic cultivation of plants have been proposed. For example, Patent Document 1 discloses a hydroponic cultivation panel that is floated on a nutrient solution surface and provided with a plurality of planting holes into which seedbed members planted with plants are inserted. Each planting hole provided in this hydroponic cultivation panel has a recess that opens to the upper surface side of the panel and a concave groove that opens to the lower surface side of the panel. The concave groove opens so as to be concave toward the nutrient solution surface side, and a space surrounded by the nutrient solution and the concave groove is formed around the seedbed member inserted into the planting hole, so that air is supplied to the roots of the plant and the growth of the plant is promoted.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the hydroponic cultivation panel of Patent Document 1, since the concave groove of each planting hole opens in a concave shape toward the nutrient solution surface side, the inner surface of the concave groove has a shape that spreads in the horizontal direction of the panel. Therefore, in the portion where the concave groove is provided, the width between the concave groove and the upper surface of the panel is small, the thickness of the panel becomes thin, and there is a possibility that the strength of the panel cannot be sufficiently ensured.

[0005] An object of the present invention is to provide a hydroponic cultivation panel that can promote the growth of plants while ensuring the strength of the panel, and a method for manufacturing such a hydroponic cultivation panel.

Means for Solving the Problems

[0006] A hydroponic cultivation panel according to one aspect of the present invention is a hydroponic cultivation panel provided with a plurality of holes, the holes include an upper opening that opens on the upper side of the hydroponic cultivation panel into which plants are inserted, and a lower opening that communicates with the upper opening and opens on the lower side of the hydroponic cultivation panel and has a shape that gradually widens toward the lower side, the inside is hollow, the upper opening is formed by a part of the upper surface bending toward the interior, and the lower opening is formed by a part of the lower surface bending toward the interior, and at least the upper side is made of a non-foaming material.

[0007] A method for manufacturing a hydroponic cultivation panel having a plurality of holes according to one aspect of the present invention, comprising: an arrangement step of arranging a first molten resin sheet in a first mold and arranging a second molten resin sheet in a second mold; and a welding step of clamping the first mold and the second mold together to weld the first molten resin sheet and the second molten resin sheet together, wherein the arrangement step is characterized by providing a protrusion in the first mold having an outer surface that gradually widens in diameter toward the first mold side, and arranging the first molten resin sheet on the surface including the protrusion so that the holes are provided in the first molten resin sheet at a position overlapping with the protrusion. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a hydroponic cultivation panel that can promote plant growth while ensuring the strength of the panel, and a method for manufacturing a hydroponic cultivation panel. [Brief explanation of the drawing]

[0009] [Figure 1] This is a plan view of a hydroponic cultivation panel according to the first embodiment. [Figure 2] This is a side view of a hydroponic cultivation panel according to the first embodiment. [Figure 3] This is a cross-sectional view of a hydroponic cultivation panel according to the first embodiment, specifically a cross-sectional view taken along the line III-III in Figure 1. [Figure 4] This is a cross-sectional view of a hydroponic cultivation panel according to the first embodiment, specifically a cross-sectional view of the section IV-IV in Figure 1. [Figure 5] This is an enlarged cross-sectional view of the holes in the hydroponic cultivation panel according to the first embodiment. [Figure 6] This is an enlarged cross-sectional view of the holes in a hydroponic cultivation panel according to the first embodiment, with plants inserted. [Figure 7] A cross-sectional view showing the arrangement process in the manufacturing process of a hydroponic cultivation panel according to the first embodiment, wherein (a) is [Figure 8] A cross-sectional view showing the welding process in the manufacturing process of a hydroponic cultivation panel according to the first embodiment, wherein (a) is [Figure 9] This is an enlarged cross-sectional view of the holes in the hydroponic cultivation panel according to the second embodiment. [Figure 10] This is an enlarged cross-sectional view of the holes in the hydroponic cultivation panel according to the third embodiment. [Modes for carrying out the invention]

[0010] (First Embodiment) A first embodiment of the present invention will be described with reference to Figures 1 to 8. As shown in Figure 1, the hydroponic cultivation panel 10 according to this embodiment is a rectangular panel-shaped member in plan view, which is floated on a nutrient solution and used for hydroponic cultivation. The hydroponic cultivation panel 10 has dimensions of, for example, 60 cm in the short side direction, dimensions of, for example, 90 cm in the long side direction, and a thickness of, for example, 3 cm. In the following description, the short side direction of the hydroponic cultivation panel 10 will be described as the front-to-back direction, and the long side direction will be described as the left-to-right direction.

[0011] The hydroponic cultivation panel 10 has multiple holes 20 arranged regularly at predetermined intervals. These holes 20 penetrate vertically and open to the upper surface 10a and lower surface 10b (see Figure 2) of the hydroponic cultivation panel 10. Plants to be grown hydroponically are inserted into each hole 20 from the upper surface 10a side of the hydroponic cultivation panel 10. In addition, four recessed handles 12 are provided near the edges in the front, back, left, and right directions of the hydroponic cultivation panel 10, serving as gripping points when carrying the hydroponic cultivation panel 10.

[0012] As shown in Figure 2, the hydroponic cultivation panel 10 is formed by bonding two sheet-like members together. These two sheet-like members are not formed by inflating foam beads, such as in styrofoam, but are formed from a non-foaming material. Specifically, the hydroponic cultivation panel 10 is formed by bonding and welding together an upper sheet 30 and a lower sheet 40, both made of hard plastic. By forming the hydroponic cultivation panel 10 from a high-strength material such as hard plastic, the hydroponic cultivation panel 10 can be easily cleaned compared to a panel made of styrofoam or the like. When the hydroponic cultivation panel 10 is used for hydroponics, the hydroponic cultivation panel 10 is floated on the nutrient solution N (see Figure 6) so that the lower sheet 40 side is submerged in the nutrient solution N.

[0013] As shown in Figure 3, five holes 20 are provided at equal intervals along the left-right direction in the center of the hydroponic cultivation panel 10 in the front-to-back direction. Also, as shown in Figure 4, four holes 20 are provided at equal intervals along the front-to-back direction on the left-to-right edges of the hydroponic cultivation panel 10. Each hole 20 has a roughly V-shaped cross-section, and its opening diameter gradually increases towards the bottom surface of the hydroponic cultivation panel 10. All holes 20 provided in the hydroponic cultivation panel 10 are the same shape and size.

[0014] In the hydroponic cultivation panel 10, the space between the upper surface side sheet 30 and the lower surface side sheet 40 is hollow. That is, in the hydroponic cultivation panel 10, the upper surface side sheet 30 and the lower surface side sheet 40 are welded to each other at the annular portion which is the outer peripheral edge thereof, and the interior is hollow. Each hole 20 has a part provided on the upper surface side sheet 30 and the remaining part provided on the lower surface side sheet 40.

[0015] Next, the shape of each hole 20 will be described in detail. As shown in FIG. 5, the hole 20 penetrates in the vertical direction, and is configured by the upper surface side opening 32 provided on the upper surface side sheet 30 and the lower surface side opening 42 provided on the lower surface side sheet 40 communicating with each other in the vertical direction. That is, the upper surface side opening 32 is formed by bending a part of the upper surface side sheet 30 toward the inner side of the hydroponic cultivation panel 10 with a hollow interior, and the lower surface side opening 42 is formed by bending a part of the lower surface side sheet 40 toward the inner side of the hydroponic cultivation panel 10. The upper surface side opening 32 opens on the upper surface 10a side of the hydroponic cultivation panel 10 and has a tapered shape that inclines in a form of gradually increasing the diameter toward the upper surface 10a side.

[0016] The lower surface side opening 42 opens on the lower surface 10b side of the hydroponic cultivation panel 10 and has a tapered shape that inclines in two steps in a form of gradually increasing the diameter from the portion communicating with the upper surface side opening 32 toward the lower surface 10b side. Specifically, the lower surface side opening 42 has a first tapered portion 42a continuous from the upper surface side opening 32 and a second tapered portion 42b continuous from the first tapered portion 42a and having a gentler inclination angle than the first tapered portion 42a. Therefore, at the portion where the first tapered portion 42a is provided, the thickness of the hydroponic cultivation panel 10 (the width between the first tapered portion 42a and the upper surface 10a) is reduced.

[0017] In the lower side opening 42, the inclination angle θ1 of the first tapered portion 42a with respect to the normal direction of the hydroponic cultivation panel 10 (the direction indicated by the dashed arrow in FIG. 5) is within the range of 20 to 90 degrees, preferably within the range of 40 to 90 degrees. The inclination angle θ2 of the second tapered portion 42b with respect to the normal direction of the hydroponic cultivation panel 10 is set to an angle smaller than the inclination angle θ1 of the first tapered portion 42a, within the range of 0 to 30 degrees, preferably within the range of 10 to 20 degrees. Further, the opening diameter D2 of the lower side opening 42 is made larger than the opening diameter D1 of the upper side opening 32 (for example, the opening diameter D1 is 25 mm and the opening diameter D2 is 47 mm).

[0018] When performing hydroponic cultivation using the hydroponic cultivation panel 10, as shown in FIG. 6, a plug body 50 such as a sponge carrying the plant P is fitted into the upper side opening 32 of each hole 20. That is, the plug body 50 is held in the upper side opening 32. The holding force of the plug body 50 in the upper side opening 32 depends on the thickness of the hydroponic cultivation panel 10 at the portion where the first tapered portion 42a connected to the upper side opening 32 is provided. In the state where the plug body 50 is fitted into the upper side opening 32, a space S surrounded by the nutrient solution N and the lower side opening 42 is formed around the plug body 50. Therefore, air can be supplied from the space S to the roots of the plant P, and the growth of the plant P can be promoted.

[0019] In the hydroponic cultivation panel 10, it is preferable that the upper side sheet 30 is white and the lower side sheet 40 is black. Since the white sheet has a high reflectance of sunlight, sunlight is efficiently reflected by the upper side sheet 30, and sufficient sunlight can be supplied to the plant P. On the other hand, since the black sheet has a low transmittance of sunlight, it is possible to suppress sunlight from passing through the lower side sheet 40 and reaching the nutrient solution N, and it is possible to suppress the growth of algae and the like on the nutrient solution N.

[0020] Now, returning to Figure 5, we will explain the relationship between the widths of the upper opening 32, the first tapered portion 42a, and the second tapered portion 42b in each hole 20. In the lower opening 42, the relationship W1 ≤ W2 holds between the width (horizontal dimension) W1 of the second tapered portion 42b and the width (horizontal dimension) W2 of the first tapered portion 42a. In this case, the ratio of the two is 1 ≤ W2 / W1 ≤ 4, and preferably 1.05 ≤ W2 / W1 ≤ 3. If the ratio of the two is greater than 4, the area where the first tapered portion 42a is provided becomes larger, and the area where the thickness of the hydroponic cultivation panel 10 is thinner increases, thus reducing the strength when holding the plug 50 in the upper opening 32. For this reason, by keeping the ratio of the two at 4 or less, the strength when holding the plug 50 in the upper opening 32 can be ensured.

[0021] Furthermore, the relationship 0.2 ≤ (W1 + W2) / (W3 + W4) ≤ 0.9 holds between the above-mentioned widths W1 and W2, the vertical width (vertical dimension) W3 of the upper opening 32, and the vertical width (vertical dimension) W4 of the lower opening 42, and preferably 0.3 ≤ (W1 + W2) / (W3 + W4) ≤ 0.6. If the ratio of W1 + W2 to W3 + W4 is less than 0.2, the space S surrounded by the nutrient solution N and the lower opening 42 becomes narrower, and the growth of the plant P cannot be sufficiently promoted. On the other hand, if the ratio of W1 + W2 to W3 + W4 is greater than 0.9, the area where the first tapered portion 42a is provided becomes larger, and the strength when holding the stopper 50 at the upper opening 32 decreases. By keeping the ratio of W1+W2 to W3+W4 within the above range, it is possible to promote the growth of plant P while increasing the holding force of the plug 50 at the upper opening 32.

[0022] Furthermore, the relationship 1 ≤ W4 / W3 ≤ 10 holds for the vertical widths W3 and W4, and preferably 3 ≤ W4 / W3 ≤ 7. If the ratio of the two is 3 smaller, the space S surrounded by the nutrient solution N and the lower opening 42 becomes narrower, and the growth of the plant P cannot be sufficiently promoted. On the other hand, if the ratio of the two is greater than 7, the area where the first tapered portion 42a is provided becomes larger, and the strength with which the stopper 50 is held at the upper opening 32 decreases. By keeping the ratio of the two within the above range, it is possible to promote the growth of the plant P while increasing the holding force of the stopper 50 at the upper opening 32.

[0023] Furthermore, when the above-mentioned widths W1, W2 and heights W3, W4 satisfy the above-mentioned numerical ranges, the relationship 0.5 ≤ W5 / (W3+W4) ≤ 0.9 holds between the heights W3, W4 and the height (vertical dimension) W5 of the second tapered portion 42b, and preferably 0.6 ≤ W5 / (W3+W4) ≤ 0.7.

[0024] Next, the manufacturing method of the hydroponic cultivation panel 10 will be described. The hydroponic cultivation panel 10 according to this embodiment is formed by a resin molding apparatus 60. The resin molding apparatus 60 is equipped with two resin supply devices arranged opposite each other, and molds a first molten resin sheet 30a and a second molten resin sheet 40a (see Figure 7). A first mold 61 and a second mold 62 are arranged on the outside of the first molten resin sheet 30a and the second molten resin sheet 40a molded by the resin molding apparatus 60, respectively.

[0025] As shown in Figure 7, the first mold 61 and the second mold 62 are arranged opposite each other. Mold frames 63 and 64 are provided around the outer circumference of the first mold 61 and the second mold 62, respectively. The first mold 61 is provided with a vacuum pump (not shown) for reducing the pressure in the space enclosed within the cavity 61a of the first mold 61. Similarly, the second mold 62 is also provided with a vacuum pump (not shown) for reducing the pressure in the space enclosed within the cavity 62a of the second mold 62. In the manufacturing process of the hydroponic cultivation panel 10, the upper sheet 30 is formed in the cavity 61a of the first mold 61, and the lower sheet 40 is formed in the cavity 62a of the second mold 62.

[0026] Within the cavity 61a of the first mold 61, first pins (projections) 71 are provided at positions corresponding to each upper opening 32 in the upper sheet 30 after molding. The pin heads of these pins have substantially the same shape as the openings of the upper openings 32, and the pin shafts are inserted into the cavity 61a. Specifically, the pin heads of the first pins 71 are tapered, with their outer surfaces gradually increasing in diameter towards the cavity 61a side of the first mold 61.

[0027] Meanwhile, within the cavity 62a of the second mold 62, second pins (projections) 72 are provided at positions corresponding to each of the lower side openings 42 in the lower side sheet 40 after molding. The pin heads of these pins have substantially the same shape as the openings 42, and the pin shafts are inserted into the cavity 62a. Specifically, the pin heads of the second pins 72 have a tapered shape, with their outer surfaces gradually expanding in diameter toward the cavity 62a side of the second mold 62, resulting in a two-stage inclination.

[0028] In the manufacturing process of the hydroponic cultivation panel 10, first, the first molten resin sheet 30a and the second molten resin sheet 40a are suspended between the first mold 61 and the second mold 62 by a resin supply device. Next, as shown in Figure 7(a), the mold frame 63 is moved toward the first molten resin sheet 30a and brought into contact with the sheet surface of the first molten resin sheet 30a. Similarly, the mold frame 64 is moved toward the second molten resin sheet 40a and brought into contact with the sheet surface of the second molten resin sheet 40a.

[0029] Next, as shown in Figure 7(b), the mold frame 63 and the first mold 61 are brought relatively close together, and the pressure is reduced in the space formed by the first molten resin sheet 30a, cavity 61a, and mold frame 63, so that the first molten resin sheet 30a is placed in the cavity 61a of the first mold 61 and shaped. Similarly, the mold frame 64 and the second mold 62 are brought relatively close together, and the pressure is reduced in the space formed by the second molten resin sheet 40a, cavity 62a, and mold frame 64, so that the second molten resin sheet 40a is placed in the cavity 62a of the second mold 62 and shaped (placement step).

[0030] In the placement process, the first pin 71 forms an upper opening 32 in the first molten resin sheet 30a placed in the cavity 61a at a position overlapping with the first pin 71. Similarly, the second pin 72 forms a lower opening 42 in the second molten resin sheet 40a placed in the cavity 62a at a position overlapping with the second pin 72. Thus, the upper opening 32 is formed by a portion of the first molten resin sheet 30a being formed and bent inward in the manufactured hydroponic cultivation panel 10, and the lower opening 42 is formed by a portion of the second molten resin sheet 40a being formed and bent inward in the manufactured hydroponic cultivation panel 10.

[0031] Next, as shown in Figure 8(a), the first mold 61, in which the first molten resin sheet 30a is formed in the cavity 61a, and the second mold 62, in which the second molten resin sheet 40a is formed in the cavity 62a, are brought relatively close together and clamped until the annular pinch-off portions 61b and 62b come into contact with each other. As a result, the first molten resin sheet 30a and the second molten resin sheet 40a are welded to each other along the pinch-off portions 61b and 62b on their outer edges, and also welded to each other in the portion sandwiched between the first pin 71 and the second pin 72 (welding process), while the remaining portions are hollow between them. After that, the first mold 61 and the second mold 62 are opened and the first molten resin sheet 30a and the second molten resin sheet 40a, which have been welded to each other, are removed.

[0032] As shown in Figure 8(b), the first molten resin sheet 30a removed from the first mold 61 and the second mold 62 becomes the upper sheet 30, and the second molten resin sheet 40a becomes the lower sheet 40. In this state, the upper opening 32 formed in the first molten resin sheet 30a and the lower opening 42 formed in the second molten resin sheet 40a are not in communication, and a joint J is formed at the boundary between the two, where the first molten resin sheet 30a and the second molten resin sheet 40a are welded together. Therefore, by cutting off each joint J and connecting the upper opening 32 and the lower opening 42, holes 20 are provided in the hydroponic cultivation panel 10. By following the above procedure, the hydroponic cultivation panel 10 according to this embodiment can be manufactured.

[0033] In the hydroponic cultivation panel 10 manufactured as described above, a plug body 50 supporting a plant P can be fitted into the upper opening 32 of each hole 20, which is formed by bending a portion of the upper sheet 30 inward. The lower opening 42 of each hole 20, which is formed by bending a portion of the lower sheet 40 inward, has a shape that gradually widens toward the lower surface 10b. As a result, the width between the lower opening 42 and the upper surface 10a can be increased compared to the case where the inner surface of the opening widens horizontally, and sufficient thickness can be secured for the hydroponic cultivation panel 10.

[0034] Furthermore, in the hydroponic cultivation panel 10 according to this embodiment, the upper sheet 30 and the lower sheet 40 are made of hard plastic, which is a non-foaming material, and the interior is hollow, which allows for weight reduction while ensuring higher rigidity than polystyrene foam and the like. As a result, sufficient strength of the hydroponic cultivation panel 10 can be ensured even in the parts where each hole 20 is provided, and the durability of the hydroponic cultivation panel 10 can be maintained even when the load applied to each hole 20 increases as the plants P supported on the plug 50 grow.

[0035] Furthermore, in the hydroponic cultivation panel 10 according to this embodiment, the lower opening 42 of each hole 20 is shaped to gradually widen toward the lower surface 10b. Therefore, when the hydroponic cultivation panel 10 is floating on the nutrient solution N, a wide space S is secured around the stopper 50, surrounded by the nutrient solution N and the lower opening 42. As a result, sufficient air can be supplied to the roots of the plant P, and the growth of the plant P can be effectively promoted. As described above, the hydroponic cultivation panel 10 according to this embodiment can promote the growth of plant P while ensuring the strength of the panel.

[0036] Furthermore, in the hydroponic cultivation panel 10, the lower opening 42 of each hole 20 is inclined in multiple stages such that the angle of inclination with respect to the normal direction of the hydroponic cultivation panel 10 gradually decreases toward the lower side. This configuration provides a specific structure for the lower opening 42 to gradually widen toward the lower surface 10b while ensuring the thickness between the upper surface 10a and the first tapered portion 42a of the hydroponic cultivation panel 10.

[0037] Furthermore, the hydroponic cultivation panel 10 is formed by bonding together an upper sheet 30 provided on the upper surface 10a side and a lower sheet 40 provided on the lower surface 10b side, and the lower opening 42 is formed by bending a part of the lower sheet 40 inward. With this configuration, in a hydroponic cultivation panel 10 formed by bonding together two sheets, it is possible to provide a specific configuration for securing a wide space S surrounded by the nutrient solution N and the lower opening 42 around the plug 50.

[0038] Furthermore, in the hydroponic cultivation panel 10, the lower opening 42 is tapered in two stages, having a first tapered portion 42a connected to the upper opening 32 and a second tapered portion 42b connected to the first tapered portion 42a, with the inclination angle θ1 of the first tapered portion 42a relative to the normal direction of the hydroponic cultivation panel 10 being 60 degrees. With this configuration, it is possible to provide an optimal inclination angle of the first tapered portion 42a so that the opening widens toward the lower surface 10b while ensuring the thickness of the hydroponic cultivation panel 10 in the portion where the first tapered portion 42a is provided.

[0039] Furthermore, in the hydroponic cultivation panel 10, the upper opening 32 of each hole 20 is tapered, gradually widening in diameter towards the upper surface 10a of the hydroponic cultivation panel 10. As a result, the opening diameter of each hole 20 increases towards the upper surface 10a of the hydroponic cultivation panel 10, making it easier to insert the plug 50, on which the plant P is supported, into the upper opening 32.

[0040] Furthermore, the manufacturing method for the hydroponic cultivation panel 10 according to this embodiment is a manufacturing method for the hydroponic cultivation panel 10 provided with a plurality of holes 20, comprising: an arrangement step of placing a first molten resin sheet 30a in a first mold 61 and a second molten resin sheet 40a in a second mold 62; and a welding step of clamping the first mold 61 and the second mold 62 together to weld the first molten resin sheet 30a and the second molten resin sheet 40a together. The arrangement step involves providing a first pin 71 in the first mold 61, the outer surface of which the pin head has a shape that gradually expands in diameter toward the first mold 61 side, and placing the first molten resin sheet 30a on the surface including the first pin 71 (inside the cavity 61a) to provide holes 20 in the first molten resin sheet 30a at positions that overlap with the first pin 71.

[0041] According to this manufacturing method, a first molten resin sheet 30a and a second molten resin sheet 40a are molded using a resin molding apparatus 60 with a material that has superior strength compared to expanded polystyrene, such as hard plastic, and the molded first molten resin sheet 30a and second molten resin sheet 40a can be shaped along the first mold 61 and second mold 62 in the placement process. In the placement process, the part of the first molten resin sheet 30a that overlaps with the first pin 71 is shaped along the outer surface of the pin head of the first pin 71, and the lower side opening 42, which has a gradually expanding diameter shape, is formed as part of the hole 20 of the hydroponic cultivation panel 10 after manufacturing.

[0042] Subsequently, in the welding process, the outer edges of the first molten resin sheet 30a and the second molten resin sheet 40a can be welded together, with a hollow space between them, and the space between the upper opening 32 and the lower opening 42. After the welding process, the space between the upper opening 32 and the lower opening 42 is connected to form a hole 20, thereby manufacturing the hydroponic cultivation panel 10. Therefore, in the manufacturing method of the hydroponic cultivation panel 10 according to this embodiment, a hydroponic cultivation panel 10 that can promote the growth of plants P while ensuring the strength of the panel can be manufactured using a material with excellent strength.

[0043] (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to Figure 9. In the description of the second embodiment, the explanation of configurations similar to those of the first embodiment will be omitted or simplified. Also, in Figure 9, each part of the second embodiment that corresponds to each part of the first embodiment is indicated by a reference numeral that is the same as that used in the first embodiment plus the number 100.

[0044] The hydroponic cultivation panel according to the second embodiment has a different shape for each hole 120 compared to the first embodiment. Specifically, as shown in Figure 9, the opening diameter D3 of the lower opening 142 of each hole 120 is larger than the opening diameter D2 of the lower opening 42 of each hole 20 in the first embodiment (for example, opening diameter D2 is 47 mm and opening diameter D3 is 58 mm). The opening diameter D1 of the upper opening 132 of each hole 120 is the same size as the opening diameter D1 of the upper opening 32 of each hole 20 in the first embodiment. Furthermore, in the second embodiment, for the lower opening 142 of each hole 120, the inclination angle θ3 of the first tapered portion 142a with respect to the normal direction of the hydroponic cultivation panel is set to a larger angle (for example, 60 degrees) than the inclination angle θ1 of the first tapered portion 42a in the first embodiment.

[0045] In the hydroponic cultivation panel according to the second embodiment, the shape of each hole 120 is as described above, which allows for a wider space surrounded by the nutrient solution and the lower opening 142 compared to the hydroponic cultivation panel 10 according to the first embodiment. Therefore, the hydroponic cultivation panel according to the second embodiment can more effectively promote the growth of plants P while ensuring the strength of the panel.

[0046] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to Figure 10. In the description of the third embodiment, the explanation of configurations similar to those of the first embodiment will be omitted or simplified. Also, in Figure 10, each part of the third embodiment that corresponds to each part of the first embodiment is indicated by a reference numeral that adds the number 200 to the reference numerals used in the first embodiment.

[0047] The hydroponic cultivation panel according to the third embodiment differs from the first embodiment in the shape of each hole 220. Specifically, as shown in Figure 10, the opening diameter D4 of the upper opening 232 of each hole 220 is larger than the opening diameter D1 of the upper opening 32 of each hole 20 in the first embodiment (for example, opening diameter D1 is 25 mm and opening diameter D4 is 43 mm). Furthermore, the opening diameter D5 of the lower opening 242 of each hole 220 is larger than the opening diameter D2 of the lower opening 42 of each hole 20 in the first embodiment (for example, opening diameter D2 is 47 mm and opening diameter D5 is 63 mm).

[0048] In the hydroponic cultivation panel according to the third embodiment, the shape of each hole 220 is as described above, allowing a larger plug to be fitted into the upper opening 232 compared to the hydroponic cultivation panel 10 according to the first embodiment, thus accommodating a variety of plants. Furthermore, the hydroponic cultivation panel according to the third embodiment allows for a wider space surrounded by the nutrient solution and the lower opening 242 compared to the hydroponic cultivation panel 10 according to the first embodiment. Therefore, the hydroponic cultivation panel according to the third embodiment can more effectively promote the growth of various plants P while ensuring the strength of the panel.

[0049] Although embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications are possible without departing from the spirit of the invention. For example, the size, arrangement, and shape of each hole provided in the hydroponic cultivation panel can be changed as appropriate. For example, in the above embodiments, a configuration in which the lower opening gradually widens in a tapered manner toward the lower side of the hydroponic cultivation panel was illustrated, but a configuration in which the lower opening gradually widens in an arc shape toward the lower side of the hydroponic cultivation panel is also possible. [Explanation of Symbols]

[0050] 10 Hydroponic cultivation panel 10a Top surface 10b Bottom surface 12 Handle 20 holes 30 top side sheet 30a First molten resin sheet 32 ​​Top side opening 40 Bottom sheet 42 Bottom opening 42a First tapered section 42b Second tapered section 50 Plug body 60 Resin molding equipment 61 First mold 61a Cavity 61b Pinch-off section 62 Second mold 62a Cavity 62b Pinch-off section 63 formwork 64 formwork 71 Pin 1 72 Pin 2 120 Hole 132 Top side opening 142 Lower side opening 142a First tapered section 220 hole 232 top side opening 242 Bottom side opening D1~D5 Opening diameter J joint N nutrient solution P plant S space W1, W2 width W3~W5 Height θ1~θ3 Tilt angle

Claims

1. A hydroponic cultivation panel having multiple holes, The hole includes an upper opening that opens on the upper side of the hydroponic cultivation panel into which the plant is inserted, and a lower opening that communicates with the upper opening and opens on the lower side of the hydroponic cultivation panel, and is shaped to gradually widen toward the lower side. The interior is hollow, the upper opening is formed by a part of the upper surface bending inward, and the lower opening is formed by a part of the lower surface bending inward. At least the upper surface is made of a non-foaming material, The upper sheet provided on the upper side and the lower sheet provided on the lower side are bonded together. A space is formed between the upper sheet and the lower sheet, making the interior hollow. The hydroponic cultivation panel is characterized in that the lower opening is inclined in multiple stages such that the angle of inclination with respect to the normal direction of the hydroponic cultivation panel gradually decreases toward the lower side.

2. The hydroponic cultivation panel according to claim 1, characterized in that the upper opening is tapered, gradually increasing in diameter toward the upper side.

3. A method for manufacturing a hydroponic cultivation panel having multiple holes, A placement step in which a first molten resin sheet is placed in a first mold and a second molten resin sheet is placed in a second mold, The process includes a welding step of clamping the first mold and the second mold together to weld the first molten resin sheet and the second molten resin sheet, The arrangement step involves providing the second mold with a protrusion whose outer surface gradually widens toward the second mold and whose angle of inclination with respect to the normal direction of the hydroponic cultivation panel gradually decreases toward the second mold in a multi-stage inclination, and by placing the second molten resin sheet on the surface including the protrusion, the hole is provided in the second molten resin sheet at a position overlapping with the protrusion, including a lower opening formed by bending a part of the lower surface inward. In the welding process, the first molten resin sheet and the second molten resin sheet are bonded together. In the welding process, a space is formed between the first molten resin sheet and the second molten resin sheet, so that the interior is hollow. A method for manufacturing hydroponic cultivation panels, characterized by the following:

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