A forestry seedling cultivation device

By designing an outer and inner frame structure made of biodegradable materials, combined with transparent plastic panels, supports, and liquid supply pipes, the problems of environmental pollution and low seedling survival rate in existing seedling cultivation devices have been solved. This has enabled full growth and observation of seedling roots, and improved the transplant survival rate and quality of seedlings.

CN118402405BActive Publication Date: 2026-04-14兰陵县林业发展中心(兰陵县自然保护地管理服务中心兰陵县森林和草原防火服务中心)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-03-25
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

Existing seedling cultivation devices use disposable cylindrical plastic bags for seedling cultivation, which leads to environmental pollution, low survival rate of transplanted seedlings, inconvenience in root observation, and low quality.

Method used

The outer and inner frame structures are made of biodegradable materials. The inner frame has notches and transparent plastic panels on its sides. The support runs through the outer frame and has connecting pipes and liquid supply pipes. The surface of the liquid supply pipes is perforated. The card plate is connected to the outer frame through a slot. The design of ventilation seams and leakage holes enables the growth and observation of seedling roots.

Benefits of technology

It improved the survival rate of seedlings after transplanting, reduced the transplanting process, protected the integrity of seedling roots and stems, facilitated the observation of root growth, increased oxygen and water supply, and improved seedling quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the field of seedling cultivation devices, and discloses a forestry seedling cultivation device which comprises an outer frame, an inner frame and a support, the outer frame is sleeved outside the inner frame, the inner frame protrudes from the upper end of the outer frame, the support penetrates through the surface of the part of the inner frame protruding from the upper end of the outer frame, and the two ends of the support extend through the two sides of the outer frame, in order to ensure that the rhizome of the seedling can fully grow after the seedling is transplanted in the inner frame and the process of transplanting is reduced, therefore, the degradable plate body is made of degradable material, when the seedling is transplanted, the movable plate needs to be disassembled, the two sides of the inner frame are in an open state, and the rhizome of the seedling can directly grow, so that the growth survival rate of the seedling is increased.
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Description

Technical Field

[0001] This invention relates to the field of seedling cultivation devices, specifically a forestry seedling cultivation device. Background Technology

[0002] Currently used seedling cultivation devices generally employ disposable cylindrical plastic seedling bags. These bags have ventilation holes in the walls or bottom. Because they are disposable, discarding them after use pollutes the environment, and centralized collection and disposal leads to high costs. Secondly, using disposable cylindrical plastic bags causes seedling roots to grow along the bag walls during growth, forming root clumps or clusters, resulting in low survival rates after transplanting. Thirdly, because of the disposable cylindrical plastic bags, it is impossible to directly observe the condition of the nutrient soil and the growth of the seedling roots during development, leading to low seedling quality and inconvenience in use. Summary of the Invention

[0003] This invention provides a forestry seedling cultivation device that overcomes the shortcomings described in the background art.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A forestry seedling cultivation device includes an outer frame, an inner frame, and a support. The outer frame is fitted over the inner frame, and the inner frame protrudes beyond the upper end of the outer frame. The support passes through the portion of the inner frame that protrudes beyond the upper end of the outer frame, and both ends of the support extend beyond the two sides of the outer frame.

[0006] The inner frame includes a biodegradable board and movable plates. The biodegradable board has a U-shaped structure. The movable plates are movably installed on the left and right sides of the biodegradable board. The upper part of both sides of the biodegradable board is provided with strip-shaped openings. The bracket passes through the strip-shaped openings on the left and right sides of the biodegradable board. The inner side of the outer frame abuts against the surfaces of the two movable plates.

[0007] The inner frame has a notch on its side for tree roots to pass through, and there is a gap between the outer frame and the inner frame for tree roots to grow. The roots of the seedlings planted in the outer frame extend outward through the notch into the gap, and there is a transparent plastic plate in the middle of the side of the outer frame so that the growth of the tree roots in the gap can be observed through the transparent plastic plate.

[0008] A preferred technical solution: The notch is composed of a first protruding shell disposed on the side of the biodegradable plate and a second protruding shell disposed on the side of the movable plate. Both the first protruding shell and the second protruding shell are connected to the inner frame through an opening. The opening of the first protruding shell faces upward, while the opening of the second protruding shell faces downward. The lower end of the first protruding shell has a first leakage hole, and the first leakage holes disposed on the upper and lower adjacent first protruding shells are arranged in the same axial direction.

[0009] The first protruding shell is filled with nutrient soil to provide nutrients to the seedling.

[0010] A preferred technical solution: The outer frame has a slot on the side away from the transparent plastic plate, and a card plate is inserted in the slot. The card plate passes through the slot from the outside to the inside and abuts against the lower end of each second protruding shell, but the card plate does not cover the opening at the second protruding shell.

[0011] A preferred technical solution: The second protruding shells are arranged in a rectangular array, and the card plate is provided with multiple protruding plates. The card plate is placed outside the outer frame, and the protruding plates pass through the card slot from the outside to the inside and abut against the lower end face of the corresponding second protruding shell. Each pair of adjacent second protruding shells abut against the same protruding plate, and there is a gap between the left and right adjacent protruding plates. The opening at the lower end of the second protruding shell communicates outward through the gap.

[0012] The surface of the movable plate is also provided with ventilation seams, and there is a ventilation seam between every two adjacent second protruding shells on the left and right sides. The ventilation seams extend along the length of the movable plate.

[0013] A preferred technical solution: The support includes a connecting tube, a liquid injection hollow tube, and a liquid supply tube. The connecting tube has threads on both ends of its left and right sides. The liquid injection hollow tube is fitted over the threads to form a threaded connection. The liquid supply tube is connected to the bottom of the connecting tube. One end of the liquid injection hollow tube is open, and the other end is connected to the liquid supply tube through the connecting tube. The surface of the liquid supply tube has holes for gas and liquid to flow out. These holes are arranged from top to bottom on the surface of the liquid supply tube, and the distance between each pair of adjacent holes gradually decreases from top to bottom.

[0014] A preferred technical solution: There are two connecting pipes, and each connecting pipe has two liquid supply pipes connected to its surface. The middle part of the liquid supply pipe is bent and protrudes outward. The two liquid supply pipes on the same connecting pipe are arranged in a flared shape, and the larger diameter ends of the liquid supply pipes on the two connecting pipes are set facing each other.

[0015] A preferred technical solution: The lower part of the inner side of the outer frame has an outwardly protruding part, and the lower part of the biodegradable plate has a corresponding stepped edge. The protruding part is embedded in the stepped edge, and multiple second leakage holes are arrayed at each corner of the upper surface of the biodegradable plate, and the second leakage holes at each corner correspond to the lower end of the adjacent liquid supply pipe.

[0016] The surface of the biodegradable plate is also provided with grooves, which are respectively staggered from the protrusions and the second leakage hole.

[0017] Compared with the prior art, this technical solution has the following advantages:

[0018] To ensure that the roots and stems of the seedlings can grow fully after transplanting within the inner frame, and to reduce the transplanting process, the biodegradable board in this invention is made of biodegradable material. When transplanting the seedlings, the movable board needs to be removed, leaving the two sides of the inner frame open to allow the roots and stems of the seedlings to grow directly, increasing the survival rate of the seedlings. When transplanting the biodegradable board together with the seedlings, it effectively prevents excessive soil from scattering outwards from the roots of the seedlings. After transplanting, the first raised shell will gradually degrade as the transplanting time increases, and the growth status of the seedlings can be directly observed through the transparent plastic board during transportation.

[0019] In this invention, the opening of the first protruding shell faces upward, while the opening of the second protruding shell faces downward. The purpose of the openings on the surfaces of the first and second protruding shells is to allow the planted seedlings to grow outward through these openings into the gap between the outer and inner frames. The different orientations of the openings on the surfaces of the first and second protruding shells are primarily to increase the growth range of the seedling roots, enabling them to more firmly wrap around and cover the inner frame. When removing the inner frame from the outer frame, the movable plates on both sides of the biodegradable board can be removed. The removal method is not to lift the movable plates directly upward, but to swing them outward using the lower end of the movable plates as a fulcrum. This removal method effectively prevents the roots of the seedlings planted in the inner frame from being torn apart when the movable plates are removed, as the roots grow downward, thus effectively protecting the integrity of the seedling roots during transplanting.

[0020] The protruding plate only serves as a stop and does not lock the movable plate. At the same time, the protruding plate is against the lower side of the second protruding shell. Therefore, when the inner frame is lifted by the bracket, the second protruding shell will move upward to abut against the upper one and lift the outer frame. The outer frame can also be moved directly by using the protruding plate to abut against the second protruding shell and lift the inner frame. Since the inner frame will move upward a certain distance before abutting against the protruding plate when the bracket is gripped and the inner frame is lifted, a gap will be formed between the inner and outer frames, allowing airflow and allowing the roots of the seedling to come into contact with more oxygen.

[0021] Users can fill the hollow injection tube and connecting tube with water through the opening at one end of the injection tube, allowing the water to flow through the supply tube and the holes on its surface to the seedlings, thus replenishing their moisture. The two flared supply tubes can also be coiled around the roots and stems of the seedlings. After transplanting, the hollow injection tube can be removed or swung downwards, creating interconnected airflow channels within the injection tube, connecting tube, and supply tube, increasing air penetration and enhancing the stability of the seedlings when buried underground, thereby increasing the survival rate of transplanted seedlings. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 for Figure 1 A half-section diagram.

[0025] Figure 3 for Figure 2 A frontal view diagram.

[0026] Figure 4 for Figure 1 A schematic diagram of its breakdown.

[0027] Figure 5 This is a structural diagram of the inner frame and the card plate.

[0028] Figure 6 This is a schematic diagram of the internal structure of the inner frame.

[0029] Figure 7 This is an exploded view of the stent.

[0030] In the figure: outer frame 1, card slot 11, card plate 12, protruding plate 121, protrusion 13, transparent plastic plate 14;

[0031] Inner frame 2, biodegradable plate 21, first protruding shell 211, first leakage hole 2111, strip opening 212, step edge 213, second leakage hole 214, groove 215, movable plate 22, second protruding shell 221, ventilation seam 222;

[0032] Support 3, connecting pipe 31, thread 311, liquid injection hollow pipe 32, liquid supply pipe 33. Detailed Implementation

[0033] like Figures 1-7As shown, a forestry seedling cultivation device includes an outer frame 1, an inner frame 2, and a support 3. The outer frame 1 is fitted over the inner frame 2, and the inner frame 2 protrudes from the upper end of the outer frame 1. The support 3 passes through the portion of the inner frame 2 that protrudes from the upper end of the outer frame 1, and both ends of the support 3 extend beyond the sides of the outer frame 1. The inner frame 2 has a notch on its side for tree roots to pass through, and there is a gap between the outer frame 1 and the inner frame 2 for tree roots to grow. The roots of seedlings planted in the outer frame 1 extend outward through the notch into the gap. The outer frame 1 has a perforated section in the middle of its side. A transparent plastic sheet 14 is used to observe the growth of tree roots within the gaps. Based on this, it can be understood that the cultivation device of this invention requires planting and wrapping seedlings through the inner frame 2 during use. Since the inner frame 2 has notches on its sides, when seedlings are planted within the inner frame 2, the roots and stems of the seedlings can grow outwards through these notches, thus preventing the roots and stems from being confined within the inner frame 2. By allowing the roots and stems to grow into the gaps, the root and stem growth of the seedlings is increased, thereby enhancing the survival rate of the seedlings. Figure 1 As shown, both sides of the bracket 3 protrude from the sides of the outer frame 1, and in this application, the inner frame 2 is fixed to the outer frame 1. When transporting this invention, the transport personnel can move the inner frame 2 and the outer frame 1 by grabbing both ends of the bracket 3.

[0034] Furthermore, the inner frame 2 includes a biodegradable board 21 and movable boards 22. The biodegradable board 21 has a U-shaped structure, and the movable boards 22 are movably installed on the left and right sides of the biodegradable board 21. Both sides of the biodegradable board 21 have strip-shaped openings 212 at the top. The bracket 3 passes through the strip-shaped openings 212 on the left and right sides of the biodegradable board 21. The inner side of the outer frame 1 abuts against the surfaces of the two movable boards 22. The movable boards 22 are connected by a movable installation method. This is mainly so that when the inner frame 2 is removed from the outer frame 1, the movable boards 22 on both sides of the biodegradable board 21 can be removed. The removal method is not to lift the movable boards 22 directly upwards, but to swing them outwards using the lower end of the movable boards 22 as a fulcrum. This removal method can effectively prevent the roots of the seedlings planted in the inner frame 2 from being torn off when the movable boards 22 are removed, because the growth direction of the roots is downwards. Therefore, it can effectively protect the integrity of the roots of the seedlings during the transplanting process.

[0035] The notch is composed of a first protruding shell 211 on the side of the biodegradable plate 21 and a second protruding shell 221 on the side of the movable plate 22. Both the first protruding shell 211 and the second protruding shell 221 are connected to the inner frame 2 through an opening. The opening of the first protruding shell 211 faces upward, while the opening of the second protruding shell 221 faces downward. The purpose of the openings on the surfaces of the first protruding shell 211 and the second protruding shell 221 is mainly to allow planted seedlings to grow outward into the gap between the outer frame 1 and the inner frame 2 through these openings. The different orientations of the openings on the surfaces of the first protruding shell 211 and the second protruding shell 221 are primarily for... The purpose is to increase the growth range of the seedling's roots and stems, allowing them to more firmly wrap around and cover the inner frame 2. The lower end of the first protruding shell 211 has a first leakage hole 2111, and the first leakage holes 2111 on the upper and lower adjacent first protruding shells 211 are arranged along the same axis. The first protruding shell 211 is filled with nutrient soil to provide nutrients to the seedling. With this arrangement, when the roots and stems of the seedling grow into each first protruding shell 211 through the opening, they can fully absorb the nutrients in the corresponding first protruding shell 211 and continue to grow downward to the lower first protruding shell 211 through the first leakage hole 2111.

[0036] It is necessary to explain that, in order to ensure that the roots and stems of the seedlings can grow fully after transplanting within the inner frame 2, and to reduce the transplanting process by eliminating the need to remove the seedlings from the inner frame 2 before planting, the biodegradable plate 21 in this invention is made of biodegradable material. The biodegradable material can be biodegradable plastic, water-degradable plastic, or directly formed by pressing paper scraps. The choice of material for the movable plate 22 is not fixed, because when transplanting the seedlings, the movable plate 22 needs to be removed so that the two sides of the inner frame 2 are open, allowing the roots and stems of the seedlings to grow directly, increasing the survival rate of the seedlings. When the biodegradable plate 21 is transplanted together with the seedlings, it can effectively ensure that the soil around the roots of the seedlings does not fall out excessively. After transplanting, the first protruding shell 211 will gradually degrade as the transplanting time increases.

[0037] Furthermore, to ensure that the inner frame 2 is fixed to the outer frame 1 when it is installed outside the outer frame 1, the outer frame 1 has a slot 11 on the side away from the transparent plastic plate 14, and a card plate 12 is inserted into the slot 11. The card plate 12 passes through the slot 11 from the outside to the inside and abuts against the lower end of each of the second protruding shells 221. However, the card plate 12 does not cover the openings of the second protruding shells 221, and the second protruding shells 221 are arranged in a rectangular array. The card plate 12 has multiple protruding plates 121, and the card plate 12 is placed on the outer frame 1. In addition, the protruding plate 121 passes through the slot 11 from the outside to the inside and abuts against the lower end face of the corresponding second protruding shell 221. Each pair of adjacent second protruding shells 221 abuts against the same protruding plate 121, and there is a gap between the two adjacent protruding plates 121. The opening at the lower end of the second protruding shell 221 communicates outward through the gap. The surface of the movable plate 22 is also provided with a vent 222. A vent 222 is provided between each pair of adjacent second protruding shells 221. The vent 222 extends along the length direction of the movable plate 22.

[0038] Based on the above, when the seedlings are wrapped in the biodegradable board 21 and the movable board 22 and placed inside the outer frame 1, they can be fixed by inserting the protruding plate 121 of the card plate 12 into the card slot 11 and pressing it against the surface of the movable board 22. Figure 2 As shown, the movable plate 22 is abutted against the side of the biodegradable plate 21. It can be seen that the protruding plate 121 only serves as abutment and does not lock the movable plate 22. At the same time, the protruding plate 121 abuts against the lower side of the second protruding shell 221. Therefore, when the inner frame 2 is lifted by the bracket 3, the second protruding shell 221 will move upward to abut against the upper 1211 and lift the outer frame 1. The outer frame 1 can also be directly moved by the protruding plate 121 abutting against the second protruding shell 221 to lift the inner frame 2. Since the inner frame 2 will move upward a certain distance before abutting against the protruding plate 121 when the bracket 3 is gripped and the inner frame 2 is lifted, a gap will be formed between the inner frame 2 and the outer frame 1, allowing airflow and allowing the roots of the seedling to come into contact with more oxygen.

[0039] Furthermore, the support 3 includes a connecting pipe 31, a liquid injection hollow pipe 32, and a liquid supply pipe 33. The connecting pipe 31 has threads 311 on both its left and right ends. The liquid injection hollow pipe 32 is fitted over the threads 311 to form a threaded connection. The liquid supply pipe 33 is connected to the lower part of the connecting pipe 31. One end of the liquid injection hollow pipe 32 is open, and the other end is connected to the liquid supply pipe 33 through the connecting pipe 31. The surface of the liquid supply pipe 33 has holes for gas and liquid to flow out. These holes are arranged from top to bottom on the surface of the liquid supply pipe 33, and the distance between any two adjacent holes gradually decreases from top to bottom. There are two connecting pipes 31, and each connecting pipe 31 is connected to two liquid supply pipes 33. The middle part of each liquid supply pipe 33 is bent and protrudes outwards. The two liquid supply pipes 33 on 31 are arranged in a flared shape, and the larger diameter ends of the liquid supply pipes 33 on the two connecting pipes 31 are set facing each other. It can be understood that the user can fill the liquid injection hollow pipe 32 and the connecting pipe 31 with water through the opening at one end of the liquid injection hollow pipe 32, and let the water flow to the seedlings through the holes on the surface of the liquid supply pipe 33 to replenish the seedlings with water. The two liquid supply pipes 33 arranged in a flared shape can also be wrapped around the roots and stems of the seedlings. After transplanting, the liquid injection hollow pipe 32 can be removed or swung downwards. The liquid injection hollow pipe 32, the connecting pipe 31 and the liquid supply pipe 33 can form a connected flow channel for air flow, which increases the air infiltration and also makes it easier to increase the stability of the seedlings when buried underground, thus increasing the survival rate of the transplanted seedlings.

[0040] Furthermore, the lower part of the inner side of the outer frame 1 has an outwardly protruding protrusion 13, and the lower part of the biodegradable board 21 has a corresponding stepped edge 213. The protrusion 13 is embedded in the stepped edge 213. Multiple second leakage holes 214 are arrayed at each corner of the upper surface of the biodegradable board 21, and the second leakage holes 214 at each corner correspond to the lower end of their adjacent liquid supply pipes 33. The surface of the biodegradable board 21 is also provided with grooves 215. The grooves 215 are staggered from the protrusion 13 and the second leakage holes 214. This arrangement can effectively form a gap between the outer frame 1 and the inner frame 2, allowing for the supply of air and liquid. While draining excess water from the inner frame 2 through the second leakage holes 214, the grooves 215 can also store some water, preventing the inner frame 2 from becoming too dry, which is not conducive to the growth of seedlings.

[0041] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A forestry seedling cultivation device, characterized in that: It includes an outer frame (1), an inner frame (2), and a bracket (3). The outer frame (1) is fitted over the inner frame (2), and the inner frame (2) protrudes from the upper end of the outer frame (1). The bracket (3) passes through the part of the inner frame (2) that protrudes from the upper end of the outer frame (1), and both ends of the bracket (3) extend over the two sides of the outer frame (1). The inner frame (2) includes a biodegradable plate (21) and a movable plate (22). The biodegradable plate (21) has a U-shaped structure. The movable plate (22) is movably installed on the left and right sides of the biodegradable plate (21). The upper part of both sides of the biodegradable plate (21) is provided with strip openings (212). The bracket (3) passes through the strip openings (212) on the left and right sides of the biodegradable plate (21). The inner side of the outer frame (1) abuts against the surfaces of the two movable plates (22). The inner frame (2) has a notch on its side for tree roots to pass through, and there is a gap between the outer frame (1) and the inner frame (2) for tree roots to grow. The roots of the seedlings planted in the outer frame (1) extend outward into the gap through the notch, and there is a transparent plastic plate (14) in the middle of the side of the outer frame (1) to observe the growth of the tree roots in the gap through the transparent plastic plate (14). The notch is formed by a first protruding shell (211) on the side of the biodegradable plate (21) and a notch on the side of the movable plate (22). The second protruding shell (221) is composed of the first protruding shell (211) and the second protruding shell (221), both of which are connected to the inner frame (2) through an opening. The opening of the first protruding shell (211) is set upward, while the opening of the second protruding shell (221) is set downward. The lower end of the first protruding shell (2111) has a first leakage hole (2111), and the first leakage holes (2111) set on the two adjacent first protruding shells (211) are set in the same axial direction. The first protruding shell (211) is filled with nutrient soil for providing nutrients to the seedlings.

2. The forestry seedling cultivation device according to claim 1, characterized in that: The outer frame (1) has a slot (11) on the side away from the transparent plastic plate (14), and a card plate (12) is inserted in the slot (11). The card plate (12) passes through the slot (11) from the outside to the inside and abuts against the lower end of each second protruding shell (221). However, the card plate (12) does not cover the opening at the second protruding shell (221).

3. The forestry seedling cultivation device according to claim 2, characterized in that: The second protruding shells (221) are arranged in a rectangular array, and the card plate (12) is provided with multiple protruding plates (121). The card plate (12) is placed outside the outer frame (1), and the protruding plate (121) passes through the card slot (11) from the outside to the inside and abuts against the lower end face of the corresponding second protruding shell (221). Each pair of adjacent second protruding shells (221) abuts against the same protruding plate (121), and there is a gap between the two adjacent protruding plates (121). The opening at the lower end of the second protruding shell (221) communicates outward through the gap. The surface of the movable plate (22) is also provided with a ventilation seam (222), and a ventilation seam (222) is provided between each pair of adjacent second protruding shells (221) on the left and right sides. The ventilation seam (222) extends along the length direction of the movable plate (22).

4. The forestry seedling cultivation device according to claim 1, characterized in that: The support (3) includes a connecting pipe (31), a liquid injection hollow pipe (32), and a liquid supply pipe (33). The connecting pipe (31) has threads (311) on both the left and right ends. The liquid injection hollow pipe (32) is fitted over the threads (311) and forms a threaded connection. The liquid supply pipe (33) is connected to the bottom of the connecting pipe (31). One end of the liquid injection hollow pipe (32) is open and the other end is connected to the liquid supply pipe (33) through the connecting pipe (31). The surface of the liquid supply pipe (33) has holes for gas and liquid to flow out. These holes are arranged from top to bottom on the surface of the liquid supply pipe (33), and the distance between each pair of adjacent holes gradually decreases from top to bottom.

5. A forestry seedling cultivation device according to claim 4, characterized in that: There are two connecting pipes (31), and each connecting pipe (31) has two liquid supply pipes (33) connected to its surface. The middle part of the liquid supply pipe (33) is bent and protrudes outward. The two liquid supply pipes (33) on the same connecting pipe (31) are arranged in a flared shape, and the larger diameter ends of the liquid supply pipes (33) on the two connecting pipes (31) are set facing each other.

6. The forestry seedling cultivation device according to claim 5, characterized in that: The lower part of the inner side of the outer frame (1) has an outward protrusion (13), and the lower part of the biodegradable plate (21) has a corresponding step edge (213). The protrusion (13) is embedded in the step edge (213), and multiple second leakage holes (214) are arrayed at each corner of the upper surface of the biodegradable plate (21), and the second leakage holes (214) at each corner correspond to the lower end of the adjacent liquid supply pipe (33). The surface of the biodegradable plate (21) is also provided with grooves (215), which are respectively offset from the protrusion (13) and the second leakage hole (214).

Citation Information

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