KR102456600B1 - Skin-integrated eco-friendly buoy and manufacturing method thereof - Google Patents

Abstract

The manufacturing method of an eco-friendly buoy according to an embodiment disclosed in this document includes the steps of providing an internal structure, attaching an upper surface and a lower shell to each of the upper and lower surfaces of the internal structure, heating the side shell to the side shell to the internal structure A step of attaching a PP (polypropylene), PE (polyethylene) comprising the step of attaching, and combining the portion where the side shell and the top shell overlap and the portion where the side shell and the bottom shell overlap, ) or PS (polystyrene), and the internal structure may include a foaming resin of the same series as the upper surface, the lower surface, and the side surface.

Description

SKIN-INTEGRATED ECO-FRIENDLY BUOY AND MANUFACTURING METHOD THEREOF

Embodiments disclosed in this document are related to the structure of the eco-friendly buoy and a method for manufacturing the eco-friendly buoy.

A buoy is a structure made of a structure and material that can be floated on the water surface, and can be used for various purposes. For example, the buoys can be used for aquaculture of various aquatic products such as oysters or laver. Aquaculture buoys may typically be cylindrical to spherical in shape.

Buoys used at sea can be frequently damaged by various natural phenomena such as temperature changes, water pressure, wind and waves. If the buoy is damaged, the buoyancy is reduced and the binding of the rope becomes difficult, so the buoy must be discarded. Therefore, interest in eco-friendly buoys that can reduce marine pollution problems is increasing.

Eco-friendly buoys can be made of a variety of structures and materials. For example, an eco-friendly buoy can be manufactured by manufacturing the shell through injection molding, inserting the inner structure into the shell, and then bonding the shell. However, in this case, since a gap between the shell and the internal structure is inevitably generated for manufacturing, the shell can be easily damaged due to an external impact. can be greatly reduced.

In another example, the buoy may be manufactured by applying a coating agent to the internal structure. However, the coating agent has a limit in its thickness, so it may be more easily damaged by temperature changes and water pressure, and when the coating agent is damaged, fragments of the internal structure may easily flow out, and recycling of the buoy after disposal may be difficult.

In another example, the buoy may be manufactured by wrapping the inner structure with a coating such as tarpaulin. However, in this case, the buoyancy force of the buoy may be greatly reduced as seawater easily penetrates between the inner structure and the covering.

In addition, in the case of aquaculture buoys, if the manufacturing cost rises to improve durability and eco-friendliness, the burden on fishermen is increased, so there is a greater need to maintain the manufacturing cost along with the improvement of performance.

On the other hand, the conventional buoy for seaweed culture may be made in the form of enclosing the internal structure with a net. However, the net may cause the generation of microplastics, and since the buoy is not provided with a hard shell, its durability may be insufficient because a rope is bound to the buoy.

Embodiments disclosed in this document are to provide a buoy having excellent durability and improved eco-friendliness and a method for manufacturing the same.

The manufacturing method of an eco-friendly buoy according to an embodiment disclosed in this document includes the steps of providing an internal structure, attaching an upper surface and a lower shell to each of the upper and lower surfaces of the internal structure, heating the side shell to the side shell to the internal structure A step of attaching a PP (polypropylene), PE (polyethylene) comprising the step of attaching, and combining the portion where the side shell and the top shell overlap and the portion where the side shell and the bottom shell overlap, ) or PS (polystyrene), and the internal structure may include a foaming resin of the same series as the upper surface, the lower surface, and the side surface.

According to an embodiment, the step of attaching the side shell may include heating the side shell to a semi-molten state.

According to an embodiment, the step of attaching the side shell may include attaching the side shell to the internal structure by bringing one end of the side shell into contact with the internal structure and rotating the internal structure.

According to an embodiment, the combining may be a step of combining a portion where the side surface and the upper surface overlap each other and a portion where the side surface and the lower surface overlap each other by ultrasonic fusion.

According to an embodiment, at least a portion of the outer surface of the internal structure may be modified by heat applied to the side shell.

According to an embodiment, the outer surface of the internal structure and the inner surface of the side shell may be melt-bonded by heat applied to the side shell.

According to an embodiment, the thickness of the upper surface, the lower surface, and the side surface may be 0.5 mm to 1.5 mm.

According to an embodiment, the internal structure may include a material processed from an oyster shell or a milling by-product of a grain.

According to an embodiment, at least a portion of the upper surface, the lower surface, and the side surface may include a UV (ultraviolet) stabilizer.

The eco-friendly buoy according to an embodiment disclosed in this document includes an internal structure, a top shell attached to the top surface of the internal structure, a bottom shell attached to the lower surface of the internal structure, and a side shell attached to the side of the internal structure, the top surface The outer shell, the lower shell, and the side shell are made of PP, PE or PS, the internal structure contains the same series of foamed resin as the top shell, the bottom shell, and the side shell, and the side shell is on the side of the internal structure in a heated state. can be attached.

The eco-friendly buoy according to an embodiment disclosed in this document includes an internal structure in which one or more annular grooves are formed for binding of a rope along the circumferential direction on the side, and a side shell attached to the side of the internal structure, and by the side shell The top and bottom surfaces of the uncovered internal structure are exposed to the outside, the side shell is made of PP, PE or PS, the internal structure contains the same series of foamed resin as the side shell, and the side shell is heated to the inside It can be attached to the side of the structure.

According to an embodiment, the side skin is heated to a semi-molten state and attached to the side surface of the inner structure, at least a part of the side surface of the inner structure is denatured by heat applied to the side skin, and at least a part of the side surface of the inner structure and the side skin At least a portion of the inner surface of the can be melt-bonded by heat applied to the side skin.

According to the embodiments disclosed in this document, by attaching the side shell to the internal structure after heating the side shell, the shell can be coupled to the internal structure without a gap between the shell and the internal structure, and the durability of the buoy can be improved can

In addition, since the outer surface of the internal structure and the inner surface of the side shell are melt-bonded, it is possible to reduce the penetration of seawater between the shell and the internal structure.

In addition, by forming the inner structure and the shell of the same type of material, the recycling of the buoy can be facilitated.

In addition, by bonding the upper/lower surface and side skins through ultrasonic fusion, the bonding strength can be improved to reduce the penetration of seawater between the upper/lower surface and side skins.

In addition, by forming an internal structure using oyster shells and/or milling by-products of grains, recycling of the above-mentioned materials can be activated.

In addition, after heating the side shell, attach the side shell to the internal structure, and remove the net of the buoy for laver farming with the upper and lower surfaces of the internal structure exposed, thereby preventing the generation of microplastics due to the netting and preventing the generation of microplastics from the buoy. By improving the durability, it is possible to prevent damage caused by the rope bound to the side.

In addition, various effects directly or indirectly identified through this document may be provided.

1 is a perspective view of an eco-friendly buoy according to an embodiment.
2 is a cross-sectional view of an eco-friendly buoy according to an embodiment.
3 is a flowchart for explaining a method of manufacturing an eco-friendly buoy according to an embodiment.
Figure 4 shows an exemplary method of attaching the upper shell and the bottom shell of the eco-friendly buoy according to an embodiment.
Figure 5 shows an exemplary way of attaching the side shell of the eco-friendly buoy according to an embodiment.
Figure 6 shows an exemplary way of combining the top shell and the side shell of the eco-friendly buoy according to an embodiment.
7 shows an exemplary way of combining the top shell and the side shell of the eco-friendly buoy according to an embodiment.
Figure 8 shows an example in which a part of the shell of the eco-friendly buoy is damaged according to an embodiment.
9 is a perspective view of an eco-friendly buoy according to an embodiment.
10 is a flowchart for explaining a method of manufacturing an eco-friendly buoy according to an embodiment.
In connection with the description of the drawings, the same or similar reference numerals may be used for the same or similar components.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that various modifications, equivalents or substitutes of the embodiments of the present invention are included. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in the description of the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

1 is a perspective view of an eco-friendly buoy according to an embodiment. 2 is a cross-sectional view of an eco-friendly buoy according to an embodiment.

1 and 2 , the eco-friendly buoy 100 according to an embodiment may include an internal structure 110 , an upper surface shell 121 , a lower surface shell 122 , and a side shell 123 . The eco-friendly buoy 100 may be used for aquaculture (eg, oyster).

According to an embodiment, the internal structure 110 may be formed in a cylindrical shape. The internal structure 110 may include one or more grooves formed along the circumferential direction on the side surface. The groove can be used for fastening of the rope. Corner portions of the internal structure 110 may be formed in a rounded curve.

According to an embodiment, the internal structure 110 may include a material processed from an oyster shell or a milling by-product of a grain. The shell of oysters may consist mostly (eg, about 97%) of calcium carbonate (CaCO ₃ ). Oyster shells can be processed into calcium carbonate. Calcium carbonate may increase the rigidity and heat resistance of the internal structure 110 , and thus may be used as an additive when the internal structure 110 is formed. The milling by-products of grains may be based on cellulose. The milling by-products can be processed into recycled plastics. Recycled plastic may be utilized when forming the internal structure 110 .

According to an embodiment, the upper shell 121 may be attached to the upper surface of the internal structure 110 , and the lower shell 122 may be attached to the lower surface of the internal structure 110 . The upper surface shell 121 and the lower surface shell 122 may be formed in a shape corresponding to the upper surface and the lower surface of the internal structure 110 . For example, when the internal structure 110 has a cylindrical shape, the upper surface shell 121 and the lower surface shell 122 may be formed in a circular shape. When attached, heat may be applied to the upper surface 121 and the lower surface shell 122, and the upper surface 121 and the lower surface shell 122 may be modified to a semi-molten state. By applying pressure to the heated upper surface shell 121 and the lower surface shell 122 , the upper surface shell 121 and the lower surface shell 122 may be attached to the internal structure 110 .

According to an embodiment, the side shell 123 may be attached to the side surface of the internal structure 110 . The side shell 123 may have a shape corresponding to the side surface of the internal structure 110 . For example, when the internal structure 110 has a cylindrical shape, the side shell 123 before attachment may have a rectangular shape. The side shell 123 may be attached to the side surface of the internal structure 110 in a heated state. For example, the side shell 123 may be heated by a heater, and may be transformed from a hard solid state to a soft, viscous semi-molten state. The semi-molten state may mean a state in which a solid and a liquid coexist. One end of the side shell 123 may be in contact with the side surface of the internal structure 110 in a semi-molten state. Thereafter, by rotating the inner structure 110 and applying pressure to the side shell 123 , the side shell 123 may be attached to the internal structure 110 .

According to an embodiment, when the side shell 123 is attached, heat applied to the side shell 123 may be transferred to the surface of the internal structure 110 . At least a portion of the outer surface of the internal structure 110 may be modified by heat applied to the side shell 123 . For example, the surface of the internal structure 110 may be finely melted by the transferred heat. Accordingly, the outer surface of the internal structure 110 and the inner surface of the side shell 123 may be melt-bonded by the heat applied to the side shell 123 . When the shell 120 is attached to the internal structure 110 using heat, the phenomenon that the internal structure 110 and the shell 120 are separated by contraction and expansion of the buoy 100 by seawater pressure can be prevented. have. In addition, even if a portion of the shell 120 is damaged, it is possible to prevent the penetration of seawater between the shell 120 and the internal structure 110 .

According to one embodiment, the thickness of the upper surface shell 121, the bottom shell 122, and the side shell 123 may be 0.5mm to 1.5mm. When the thickness of the shell 120 is excessively thin, the heat retained by the shell 120 may not be enough, so attachment may not be easy, and when the thickness of the shell 120 is excessively thick, the weight of the buoy 100 This may increase and degrade performance. Therefore, there is a need to form the shell 120 to an appropriate thickness.

According to one embodiment, the upper shell 121, the bottom shell 122, and the side shell 123 may be made of PP (polypropylene), PE (polyethylene) or PS (polystyrene), and the internal structure 110 is the top surface The shell 121, the lower shell 122, and the side shell 123 may include the same series of foamed resin. That is, the internal structure 110 and the outer shell 120 may be made of the same series of materials. For example, when the internal structure 110 is made of expanded polypropylene (EPP), the outer shell 120 may be made of PP. For another example, when the internal structure 110 is made of expanded polyethylene (EPE), the outer shell 120 may be made of PE. For another example, when the internal structure 110 is made of expanded polystyrene (EPS), the outer shell 120 may be made of PS. The internal structure 110 may further include an additional material in addition to the foamed resin of the same series as the outer shell 120 . For example, the inner structure 110 may include EPP and TPO (thermoplastic olefin), in this case, the outer shell 120 may be made of PP. The internal structure 110 may additionally include a material other than TPO.

When the internal structure 110 and the shell 120 are made of the same series of materials, melt bonding may occur between the internal structure 110 and the shell 120 by heat applied to the shell 120 . In addition, since the shell 120 and the internal structure 110 can be recycled by crushing at one time without separating from each other, the recycling of the buoy 100 can be made through a simpler process. The recycled material may be utilized in the production of the buoy 100, and may be used in the production of various plastic products such as flowerpots, trash cans, fibers, carpets, pipes, septic tanks, piles, posts, insulation, aggregates or building materials.

According to an embodiment, the portion where the side shell 123 and the top shell 121 overlap and the portion where the side shell 123 and the bottom shell 122 overlap may be combined by ultrasonic welding. The overlapping portions of the shell 120 need to be joined to prevent penetration of seawater. Fusion may be performed by transmitting ultrasonic waves to the overlapping portion using a horn. By performing ultrasonic welding, the airtightness of the bonding portion may be enhanced compared to the case of using other methods such as thermal welding.

According to an embodiment, at least a portion of the upper shell 121 , the bottom shell 122 , and the side shell 123 may include a UV (ultraviolet) stabilizer. The buoy 100 may be exposed to UV for a long time, and the shell 120 may be damaged by UV. Therefore, by adding a UV stabilizer to the shell 120, durability can be improved.

3 is a flowchart for explaining a method of manufacturing an eco-friendly buoy according to an embodiment.

Referring to FIG. 3 , in step 310, an internal structure may be provided. For example, the inner structure may then be loaded onto a workbench for attachment of the skin.

In step 320 , the upper surface and the lower surface may be attached to the upper surface and the lower surface of the internal structure, respectively. For example, the top shell and the bottom shell may be attached to the inner structure by a jig.

In step 330 , the side shell may be attached to the side surface of the inner structure after being heated. For example, the side skin may be attached by rotation of the inner structure in a semi-molten state and pressure by a pressing jig.

In step 340 , the portion where the side surface and the upper surface overlap and the portion where the side surface and the lower surface overlap may be combined. For example, the overlapping portions may be joined by ultrasonic welding.

Each of the above-described steps will be described in detail below with reference to FIGS. 4 to 6 .

Figure 4 shows an exemplary method of attaching the upper shell and the bottom shell of the eco-friendly buoy according to an embodiment.

Referring to FIG. 4 , the upper surface 121 and the lower surface 122 may be seated in a recess formed in the jig 10 . Heat may be applied to the top shell 121 and the bottom shell 122 through the jig 10 or through an external heater. The upper surface shell 121 and the lower surface shell 122 may be transformed into a semi-molten state by the applied heat.

The jig 10 may rotate to access the internal structure 110 . The jig 10 may be rotated by, for example, the first cylinder 21 . The jig 10 may have the heated upper surface 121 and the lower surface 122 between the jig 10 and the internal structure 110 , and may apply pressure to the internal structure 110 . The pressure may be applied by, for example, the first cylinder 21 , the second cylinder 22 and the third cylinder 23 . By pressing the heated upper shell 121 and the lower shell 122 to the internal structure 110 , the top shell 121 and the lower shell 122 may be attached to the internal structure 110 .

In this case, at least a portion of the upper surface and the lower surface of the internal structure 110 may be modified by heat applied to the upper surface shell 121 and the lower surface shell 122, and the inner surface of the upper surface shell 121 and the lower surface shell 122 is Similar to the side shell 123 , it may be melt-bonded with the surface of the inner structure 110 .

Figure 5 shows an exemplary way of attaching the side shell of the eco-friendly buoy according to an embodiment.

Referring to FIG. 5 , the side shell 123 may be transported by the conveyor belt 30 in a solid solid state. The transferred side shell 123 may be heated by a ceramic heater 40 . The heated side shell 123 may be transformed into a semi-molten state.

The inner structure 110 may rest on the roller 50 . In FIG. 5 , only one roller 50 is shown, but the present invention is not limited thereto, and the inner structure 110 may be rotated by two rollers placed under the inner structure 110 , and 2 placed on the inner structure 110 . The outer skin may be pressed against the inner structure 110 by the rollers.

For example, the side shell 123 may be input in a state where the roller 50 placed on the internal structure 110 is spaced apart from the internal structure 110 . Due to the rotation (eg, counterclockwise) of the roller 50 placed under the internal structure 110, the internal structure 110 may rotate (eg, clockwise), and one end of the side shell 123 is the internal structure 110 may be contacted. The roller 50 placed on the internal structure 110 may approach the internal structure 110 after the side shell 123 is input and press one end of the shell to the internal structure 110 .

After the outer skin is inserted, the roller 50 may be reversely rotated (eg, clockwise), and a phenomenon in which wrinkles are generated at one end of the side surface 123 due to the reverse rotation may be prevented.

After the reverse rotation, the roller 50 may be rotated again (eg, counterclockwise), and the entire side shell 123 may be pressed against the internal structure 110 due to the rotation. Through the above-described bonding method, the inner surface of the side shell 123 may be melt-bonded with the outer surface of the inner structure 110 .

Figure 6 shows an exemplary way of combining the top shell and the side shell of the eco-friendly buoy according to an embodiment.

Referring to FIG. 6 , the buoy 100 with the shell attached to the internal structure may be seated on the rotating jig 60 . An ultrasonic horn 70 can access the overlapping portion of the skin. Although two horns 70 are illustrated in FIG. 6 for convenience of description, the number of horns may be arbitrarily changed according to an implementation form.

While rotating the buoy 100 using the rotating jig 60, ultrasonic welding may be repeatedly performed. For example, after performing ultrasonic welding, by rotating the buoy 100 at a certain angle, and repeating the ultrasonic welding again, ultrasonic welding can be performed for the entire section of the overlapping portion. The ultrasonically fused portion may have, for example, a square shape. By sealing the overlapped portion through ultrasonic welding, it is possible to prevent the penetration of seawater into the buoy 100.

7 shows an exemplary way of combining the top shell and the side shell of the eco-friendly buoy according to an embodiment.

Referring to Figure 7, the overlapping portion of the shell of the buoy may be joined by ultrasonic welding. The shape of the ultrasonically fused portion may be variously changed. For example, the ultrasonically welded portion may have an elongated rectangular shape. The shape of the ultrasonically fused portion may be changed according to the shape of the ultrasonic horn.

In a manner similar to that described in FIG. 6 , after ultrasonic welding is performed, by rotating the buoy at a certain angle, and repeating ultrasonic welding again, ultrasonic welding can be performed for the entire section of the overlapping portion. When the ultrasonic welding is completed, the ultrasonically welded portion may form a polygonal shape in which an elongated rectangle is connected. Accordingly, the strength of the bond by ultrasonic welding may be further improved.

Figure 8 shows an example in which a part of the shell of the eco-friendly buoy is damaged according to an embodiment.

Referring to FIG. 8 , the eco-friendly buoy 100 according to an embodiment may receive pressure from any direction by seawater. When pressure is applied to the buoy 100, a portion of the buoy 100 may be deformed. Even if the buoy 100 is deformed, since the shell 120 is attached to the internal structure 110 through heating, the phenomenon that the internal structure 110 and the shell 120 are separated can be prevented. Therefore, the durability of the buoy 100 can be improved.

On the other hand, a portion of the shell 120 of the eco-friendly buoy 100 may be damaged according to use. When the shell 120 is damaged, the internal structure 110 may be exposed to seawater. Even if the internal structure 110 is exposed to seawater, the internal structure 110 made of EPP or EPE has high strength so that the fragments may not flow out. In addition, since the internal structure 110 and the shell 120 are bonded by heat, it is possible to prevent the penetration of seawater between the internal structure 110 and the shell 120 . Therefore, even if a part of the shell 120 is damaged, the buoyancy of the buoy 100 is not significantly reduced, and the performance of the buoy 100 can be maintained.

9 is a perspective view of an eco-friendly buoy according to an embodiment.

Referring to FIG. 9 , the eco-friendly buoy 1000 according to an embodiment may include an internal structure 1010 and a side shell 1023 . Eco-friendly buoy 1000 may be used to replace the buoy network.

According to an embodiment, the internal structure 1010 may have a cylindrical shape. The internal structure 1010 may include one or more annular grooves for binding of the rope formed along the circumferential direction on the side thereof. The internal structure 1010 may be configured similarly to the internal structure 110 illustrated in FIGS. 1 and 2 .

According to an embodiment, the side shell 1023 may be attached to the side surface of the internal structure 1010 . The side shell 1023 may be made of PP, PE or PS. The side shell 1023 may be attached to the side surface of the inner structure 1010 in a heated state. The side sheath 1023 may be configured similarly to the side sheath 123 shown in FIGS. 1 and 2 and may be attached to the inner structure 1010 in a similar manner.

The internal structure 1010 may include a foamed resin of the same series as that of the side shell 1023 . For example, the internal structure 1010 may include a foamed resin including a material of the same series as the material of the side shell 1023 among EPP, EPE, or EPS. The material of the inner structure 1010 may be selected in a principle similar to the material of the inner structure 110 shown in FIGS. 1 and 2 .

The upper surface 1011 and the lower surface 1012 of the internal structure 1010 may be exposed to the outside. When only the side shell 1023 is attached to the internal structure 1010 , the upper surface 1011 and the lower surface 1012 of the internal structure 1010 may be regions not covered by the side shell 1023 . The upper surface 1011 and the lower surface 1012 of the internal structure 1010 may be exposed for laver farming.

Since the eco-friendly buoy 1000 according to an embodiment is made of a foamed resin such as EPP, the strength is relatively high, so there is no need to cover the outside with a net. Therefore, it is possible to prevent the phenomenon that microplastics generated due to the net over the buoy pollute the seawater. In addition, by attaching the side shell 1023 to the side surface, even if the rope is strongly bound to the annular groove, it is possible to prevent damage to the internal structure 1010 due to the rope. The side shell 1023 according to an embodiment is attached to the internal structure 1010 in a semi-molten state after heating, and at least a portion of the side surface of the internal structure 1010 is modified by heat applied to the side shell 1023, so that the side shell At least a part of the inner surface of the 1023 and at least a part of the side surface of the internal structure 1010 are melt-bonded, so even if the rope is bound, the side shell 1023 is damaged or the side shell 1023 and the internal structure 1010 are not separated. may not be In addition, the penetration of seawater between the side shell 1023 and the inner structure 1010 can be prevented.

10 is a flowchart for explaining a method of manufacturing an eco-friendly buoy according to an embodiment.

Referring to FIG. 10 , in operation 1110 , an internal structure may be provided. For example, the inner structure may then be loaded onto a workbench for attachment of the skin.

In step 1120, the side shell may be attached to the side surface of the inner structure after being heated so that the upper and lower surfaces of the inner structure are exposed to the outside. For example, the side skin may be attached by rotation of the inner structure in a semi-molten state and pressure by a pressing jig. Areas not covered by the side skin of the inner structure may be exposed to the outside.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims (12)

In the manufacturing method of an eco-friendly buoy,
providing an internal structure;
attaching the upper surface and the lower surface of the inner structure to the upper surface and the lower surface, respectively;
attaching the side shell to the inner structure by heating the side shell; and
Combining a portion in which the side surface and the upper surface overlap each other and a portion where the side surface and the lower surface overlap each other;
The step of attaching the side shell,
heating the side skin to a semi-molten state;
contacting one end of the side shell to the inner structure, and
attaching the side sheath to the inner structure by rotating the inner structure and applying pressure to the side sheath;
The upper surface shell, the lower surface shell and the side shell are made of PP (polypropylene),
The internal structure includes expanded polypropylene (EPP), which is a foamed resin of the same series as the upper shell, the bottom shell, and the side shell,
When the side shell is attached, at least a part of the outer surface of the inner structure is denatured by heat applied to the side shell,
At least a portion of an outer surface of the inner structure and at least a portion of an inner surface of the side shell are melt-bonded by heat applied to the side shell. delete delete The method of claim 1,
The combining step is
It characterized in that the step of bonding the overlapping portion of the side shell and the upper shell and the overlapping portion of the side shell and the bottom shell by ultrasonic welding. delete delete The method of claim 1,
The thickness of the upper surface shell, the lower surface shell and the side shell is characterized in that 0.5mm to 1.5mm, the method. The method of claim 1,
The method of claim 1 , wherein the internal structure comprises material processed from oyster shells or milling by-products of grains. The method of claim 1,
The method, characterized in that at least a portion of the top shell, the bottom shell, and the side shell comprises a UV (ultraviolet) stabilizer. In the eco-friendly buoy,
internal structures;
an upper shell attached to the upper surface of the internal structure;
a lower shell attached to the lower surface of the internal structure; and
Comprising a side shell attached to the side of the internal structure,
The top shell, the bottom shell and the side shell are made of PP,
The internal structure includes EPP, which is a foamed resin of the same series as the upper shell, the bottom shell, and the side shell,
The side shell is attached to the side surface of the inner structure by heating the side shell to a semi-melted state, one end of the side shell is in contact with the internal structure, the internal structure is rotated and pressure is applied to the side shell become,
When the side shell is attached, at least a part of the outer surface of the inner structure is denatured by heat applied to the side shell,
At least a portion of the outer surface of the inner structure and at least a portion of the inner surface of the side shell are characterized in that the fusion-bonded by heat applied to the side shell, eco-friendly buoy. In the eco-friendly buoy,
An internal structure in which one or more annular grooves are formed on the side surface for binding of the rope along the circumferential direction; and
Comprising a side shell attached to the side of the internal structure,
The upper and lower surfaces of the internal structure not covered by the side shell are exposed to the outside,
The side shell is made of PP,
The internal structure includes EPP, which is a foamed resin of the same series as the side shell,
The side shell is attached to the side surface of the inner structure by heating the side shell to a semi-melted state, one end of the side shell is in contact with the internal structure, the internal structure is rotated and pressure is applied to the side shell become,
When the side shell is attached, at least a part of the outer surface of the inner structure is denatured by heat applied to the side shell,
At least a portion of the outer surface of the inner structure and at least a portion of the inner surface of the side shell are characterized in that the fusion-bonded by heat applied to the side shell, eco-friendly buoy. delete

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