KR101853824B1 - METHOD FOR PREPARING Expanded PolyPropylene BUOYANCY MEMBER - Google Patents

METHOD FOR PREPARING Expanded PolyPropylene BUOYANCY MEMBER Download PDF

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Publication number
KR101853824B1
KR101853824B1 KR1020160013634A KR20160013634A KR101853824B1 KR 101853824 B1 KR101853824 B1 KR 101853824B1 KR 1020160013634 A KR1020160013634 A KR 1020160013634A KR 20160013634 A KR20160013634 A KR 20160013634A KR 101853824 B1 KR101853824 B1 KR 101853824B1
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KR
South Korea
Prior art keywords
body unit
mold
molding
foamed polypropylene
polypropylene
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Application number
KR1020160013634A
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Korean (ko)
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KR20170092753A (en
Inventor
김영근
김우찬
차혜민
김숭경
Original Assignee
주식회사 씨라이프
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Priority to KR1020160013634A priority Critical patent/KR101853824B1/en
Publication of KR20170092753A publication Critical patent/KR20170092753A/en
Application granted granted Critical
Publication of KR101853824B1 publication Critical patent/KR101853824B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00—Culture of aquatic animals
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00—Culture of aquatic animals
    • A01K61/50—Culture of aquatic animals of shellfish
    • A01K61/54—Culture of aquatic animals of shellfish of bivalves, e.g. oysters or mussels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/06—Making multilayered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/1266—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being completely encapsulated, e.g. for packaging purposes or as reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3415—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/56—After-treatment of articles, e.g. for altering the shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/56—After-treatment of articles, e.g. for altering the shape
    • B29C44/5627—After-treatment of articles, e.g. for altering the shape by mechanical deformation, e.g. crushing, embossing, stretching
    • B29C44/5636—After-treatment of articles, e.g. for altering the shape by mechanical deformation, e.g. crushing, embossing, stretching with the addition of heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81—Aquaculture, e.g. of fish

Abstract

The method of manufacturing a buoyant body according to the present invention includes a molding step of molding a body unit floating in water with expanded polypropylene (EPP), wherein the polypropylene resin particles have a particle size of not more than 50 times And can be formed into a thickness of 200 mm or less through the mold.

Description

METHOD FOR PREPARING Expanded PolyPropylene BUOYANCY MEMBER [0002]

The present invention relates to a method for manufacturing buoyancy bodies floating in water.

In the coastal waters, a marine biological farm is being operated in which fish, shellfish and seaweed are cultured in a net or growth plate by hanging net or growth plate on float.

Float is an essential element in the installation of netting or growth plates, but it is being identified as a major cause of marine pollution.

In order to solve the marine pollution problem, the existing floe fluid of the Styrofoam can be replaced by the polypropylene material.

Korean Patent Publication No. 1155877 discloses a buoy having improved corrosion resistance, weather resistance, chemical resistance, solvent resistance and strength of a float by applying a polypropylene film to the surface of a buoy formed from polypropylene foam.

However, Korean Patent Publication No. 1155877 includes a step of applying a separately provided polypropylene film on the surface of a buoy, which complicates the work process.

In addition, there is no manufacturing method for various additional facilities required for buoyant bodies such as buoys.

In addition, there is no method to solve the problem of the buoyant body caused by the self-characteristics of polypropylene.

Korean Patent Registration No. 1155877

The present invention is to provide a method for manufacturing a buoyant body made of expanded polypropylene having various sizes and shapes by a simple process.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

The method of manufacturing a buoyant body according to the present invention includes a molding step of molding a body unit floating in water with expanded polypropylene (EPP), wherein the polypropylene resin particles have a particle size of not more than 50 times , And can be formed by applying heat to the inside of the mold by steam or the like. The body unit can be optimized to a thickness within 200 mm of the foamed polypropylene.

Wherein the shaping step comprises forming a wall having a set thickness within a range of 200 mm and a cavity surrounded by the wall, wherein the total diameter of the body unit by the cavity and the wall is 200 mm or the set thickness Can be exceeded.

According to the buoyant manufacturing method of the present invention, a buoyant body made of expanded polypropylene can be produced. Foamed polypropylene buoyant bodies are less polluting and can be used for a long time.

The method of manufacturing the buoyant body of the present invention can solve the problem that it is difficult to manufacture a buoyant body made of expanded polypropylene due to a technical problem, and can produce buoyant body in various sizes and various shapes.

Further, according to the present invention, the buoyant body can be surface-treated by a simple process.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart illustrating a method of manufacturing a buoyant body of the present invention.
2 is a photograph showing a buoy formed by foaming with polystyrene.
3 is a schematic view showing a body unit molded through the molding step of the present invention.
4 is a cross-sectional view showing an end portion of a wall portion forming the body unit of the present invention.
5 is a flow chart illustrating another forming step of the present invention.
6 is a schematic view showing a buoyant manufacturing method for forming a hollow using a reinforcing material.
7 is a schematic view showing a body unit manufactured by another buoyant manufacturing method of the present invention.
8 is a schematic view showing the melting step of the buoyant manufacturing method of the present invention.
9 is a schematic view showing a state in which a wire is wound around a body unit manufactured by the buoyant manufacturing method of the present invention.
10 is a sectional view showing a wall portion of the body unit.
11 is a schematic view showing a cross section of the body unit.
12 to 15 are schematic views showing a process of forming a handle groove on the surface of the body unit.
16 is a schematic view showing the moving means box of the present invention.
17 is a schematic view showing a state in which a high-density layer is formed using a metal mold.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. Definitions of these terms should be based on the content of this specification.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart illustrating a method of manufacturing a buoyant body of the present invention.

The buoyant manufacturing method of the present invention may include a forming step (S 510), a melting step (S 520), a surface treatment step (S 530), and a crosslinking step (S 540).

The molding step (S 510) may be a step of molding the body unit (100) floating on the water using expanded polypropylene (EPP).

The forming step S 510 is a step of forming the body unit 100 corresponding to the body of the buoyant body. The body unit 100 may be a buoyant body itself or may form an outer shape of the buoyant body.

The melting step (S 520) may be a step of melting the surface of the body unit (100) through various methods.

The surface treatment step (S 530) may be a step in which the surface of the body unit (100) softened due to the melting step is strengthened. Or the surface treatment step (S 530) may be a step of smoothly treating the surface of the body unit 100 which becomes rugged or irregular due to the melting step.

The crosslinking step (S 540) may be a step of irradiating infrared rays or the like to the surface of the body unit 100 and curing the body unit 100.

Hereinafter, each step will be described in detail.

2 is a photograph showing a buoy formed by foaming with polystyrene.

As a result, it can be confirmed that the surface of the polystyrene buoy 10 is scratched off by corrosion, shock, or the like. Since the body of the buoy is easily recovered, it may not be environmental waste, but the fragments separated from the body become environmental waste as it is difficult to recover.

A method of forming a coating layer such as polyurethane on the polystyrene surface may be proposed in order to prevent environmental pollution caused by the polystyrene buoy 10. However, it is practically difficult to form a coating layer on the polystyrene surface susceptible to heat, and there is a problem that the inside of polystyrene is leaked to the outside when the coating layer is broken. In other words, buoys made of polystyrene are the main cause of environmental pollution because the possibility of small pellets leaking into the sea is very high.

In order to solve the environmental pollution problem, the buoyant manufacturing method of the present invention may include a forming step (S 510) of molding the body unit 100 with foamed polypropylene.

Specifically, the body unit 100 is formed by placing polyolefin mini pellets or polypropylene resin particles containing various additives or nucleating agents in a chamber, a mold, or an autoclave containing water, and blowing agent , Carbon dioxide, nitrogen, butane, etc.) and then rapidly depressurizing the mixture (hereinafter referred to as batch type).

Molded products made from expanded polypropylene have excellent mechanical strength, heat resistance, processability, cost balance, flammability and regeneration ability. Accordingly, the body unit 100 formed of foamed polypropylene in the molding step of the present invention has a small environmental pollution problem and has advantages of long-term use.

Despite these advantages, there are other problems besides the cost problem that the buoyant body is made of polystyrene.

It is easy to expect that the body unit 100 having a predetermined size is formed by molding the foamed polypropylene foamed in the mold 310 manufactured in the set size, but the reality differs.

Foamed polypropylene, when particles of polypropylene resin are foamed more than 50 times, many of the original advantages can be compromised. In addition, foamed polypropylene can be damaged by many advantages inherent in foaming even when foaming to a thickness exceeding 200 mm. Even if a molded article of foamed polypropylene is forcibly molded in a mold 310 having a diameter exceeding 200 mm, the molded article is damaged even in the case of a weak impact, and the original shape is not maintained and is easily broken.

Usually, the diameter of the floating body floating above the water is generally more than 200 mm. Therefore, it is difficult to make a buoyant body having a desired size by using expanded polypropylene. Therefore, a buoyant body has been produced with polystyrene which can be formed into various sizes and shapes.

In the method of manufacturing the buoyant body of the present invention, particles of polypropylene resin can be foamed to a size of 50 times or less in the molding step so that the advantage of the foamed polypropylene is not damaged, thereby forming a foamed polypropylene. Further, in the molding step, the foamed polypropylene can be molded to a thickness of 200 mm or less through the mold 310.

In the present invention, a method may be provided for manufacturing the body unit 100 having a diameter of more than 200 mm by using a foamed polypropylene having a thickness of 200 mm or less.

3 is a schematic view showing the body unit 100 molded through the molding step of the present invention.

The forming step S 510 can form the hollow part 200 surrounded by the wall part 190 and the wall part 190 having the set thickness W1 in the range of 200 mm or less using the foamed polypropylene.

The entire diameter L3 of the body unit 100 by the hollow 200 and the wall portion 190 may exceed 200 mm or the set thickness w1. For example, when the thickness w1 of both side walls is 200 mm and the diameter L1 of the hollow 200 is 500 mm, the diameter (outer diameter) L3 of the body unit 100 is 200 mm in thickness of one side wall, 200 mm in thickness of the other side, ) Of 500 mm in diameter.

The forming step S 510 of the present invention may form the hollow 200 inside the body unit 100 and form the wall 190 according to the shape and size of the hollow 200. Thus, buoyant polypropylene having a limited set thickness w1 can be used to produce buoyancy bodies of various shapes and sizes. Also, due to the hollow 200, high buoyancy can be provided. In addition, since the hollow 200 can reduce the amount of foamed polypropylene necessary for manufacturing the body unit 100, the productivity can be improved.

Since the hollow 200 is provided inside the body unit 100 from the outside, it may be difficult to manufacture the hollow 200 through the general molding die 310.

In order to easily produce the hollow 200, the molding step is a step (S 511) of forming a plurality of body parts 110 with foamed polypropylene, a step of forming the body unit 100 by joining the body parts 110 together (S 513).

Each body portion 110 may include a wall portion 190 having a set thickness w1 in a range of 200 mm or less, and a receiving space 201 surrounded by the wall portion 190 and opened at one side.

The mold 310 for performing the step S 511 of forming the body 110 may be formed such that the wall 190 of the body 110 and the accommodation space 201 of the body 110 are formed .

The plurality of body portions 110 may be coupled to each other at the step S 513 of joining the body portions 110 to each other.

In FIG. 3, two body parts 110 are provided, and the wall parts 190 of the respective body parts 110 are engaged with each other to couple the body parts 110 together.

When the wall portions 190 are coupled to each other, the wall portions 190 form the surface of the body unit 100, and the accommodation spaces 201 are coupled to each other to form the hollow 200 inside the body unit 100 .

The joining between the body parts 110 may be performed while the joining faces of the body parts 110 are bonded to each other in a state where the joining face of the body part 110 including the foamed polypropylene is melted due to heating at 130 ° C or more have. According to the present invention, the wall portion 190 of each body portion 110 includes foamed polypropylene, so that it can be melted by heat. The foamed polypropylene is melted by heating the end portion of the wall portion corresponding to the mating surface in the wall portion 190 of the specific body portion 110 and then pressed on the wall portion 190 of the other body portion 110 and cooled. 110 may be tightly coupled.

The first body part and the second body part which are coupled to each other through the molding step can be molded. At this time, the first concave-convex part 191 may be formed on the coupling surface of the first body part during the molding process. In addition, the second concave-convex part 192 to be fitted to the first concave-convex part 191 may be formed on the coupling surface of the second body part during the molding process. According to the first concave-convex part 191 and the second concave-convex part 192, the first body part and the second body part can be easily combined. In addition, since the length of the engagement surface increases due to each concave-convex portion, the adhesion between the first body portion and the second body portion can be improved.

Since the body portions 110 are joined using the melting of the wall portions 190 constituting the body portion 110, a separate adhesive for joining the body portions 110 is not required, Can be performed.

Alternatively, the coupling between the body portions 110 can be performed using a plate portion 171 formed integrally with the coupling surface of the body portion 110 or interposed between the coupling surfaces of the respective body portions 110 have. The engaging faces can be pressed against each other in a state where the plate portions 171 located between the engaging faces of the respective body portions 110, for example, the wall portions 190 coupled to each other, are melted by heating at 170 DEG C or more. As another example, each of the engagement surfaces may be pressed against each other in a state in which liquid resin heated to 130 DEG C or higher is interposed between the engagement surfaces of the respective body portions 110, or in a state in which the liquid resin is applied to the engagement surface of the specific body portion. The material of the plate portion 171 or the liquid resin may include a polypropylene resin that adheres well to the foamed polypropylene. When the melted plate portion 171 is hardened in the state of being pressed against each other, the respective body portions 110 can be firmly coupled to each other. At this time, the plate portion 171 may be formed in a lattice structure or a mesh structure so as to be easily melted by heating.

4 is a sectional view showing an end portion of the wall portion 190 forming the body unit 100 of the present invention.

The end portions of the wall portions 190 may be thicker than the other portions of the wall portions 190 when the coupling surfaces between the body portions 110 are the end portions of the wall portions 190.

When melted due to heating, the particles of the foamed polypropylene can be made small. As a result, the shape of the end portion of the wall portion 190 having a smaller particle size is deformed, thereby causing a gap in the joining surface, or the wall portion 190 may be twisted. However, if the thickness of the end portion of the wall portion 190 is formed thicker than other portions, deformation or deterioration of bonding force due to thermal deformation can be minimized.

The other portion of the wall portion 190 may have a thickness close to the limit value of the foamed polypropylene. In this case, it may be difficult to form the end portion of the wall portion 190, which is a coupling surface, thicker than other portions. To solve this problem, the end portion of the wall portion 190 may extend in a direction parallel to the engagement surface as shown in Fig. According to the end portion of the wall portion extending in the direction parallel to the engaging surface, there is an effect that the engaging surface is increased. Further, when the portion extending in the direction parallel to the coupling surface after the coupling is heated (F) in the direction toward the surface of the wall portion, the coupling surface is tangled, and watertightness performance can be improved.

Referring again to FIG. 3, when the hollow 200 is large, a problem may arise in the rigidity of the body unit 100 by coupling only the wall portion 190. For example, when the hollow 200 is large, when a shock is applied to the center of the body unit 100, a wall portion (not shown) which is far from the fulcrum (both end portions 190 of the body unit 100 in the x- The center of the recess 190 may be depressed.

In order to prevent the wall portion 190 from being depressed due to an external impact or the like, the body portion 110 may be provided with a partition 180 protruding from the inner surface of the accommodation space 201 toward one opening.

The barrier ribs 180 of the specific body portion 110 may be brought into contact with and bonded to the barrier ribs 180 of the other body portion 110 in the same manner as the wall portions 190.

When the wall portion 190 and the partition 180 are present together on the body portion 110, the body portion 110 may be engaged with the wall portion 190 and the partition 180 during the coupling process. The body unit 100 which is robust against an external impact can be provided due to the partition 180 and the coupling area can be increased to improve the coupling force.

On the other hand, the surface of the body unit 100 formed of foamed polypropylene can be harder than a polystyrene molded body. When the wire 280 is wound around the outer circumferential surface of the molded product of polystyrene, the wire 280 may be loosened so as to penetrate the flesh of the molded body as shown in FIG. On the other hand, the body unit 100 formed of foamed polypropylene can have a rigidity that does not even scratch to the extent that the wire 280 is pulled.

The handle 210 may be installed on the body unit 100 in consideration of transportation convenience. However, when the body unit 100 is integrally formed, it may be difficult to provide the handle 210, which is provided separately from the body unit 100, on the body unit 100. That is, there is an inconvenience that the molding operation is not automated and the operation is manually performed in order to insert and shape the handle in the molding process through the mold. According to the present invention, the handle can be easily installed in the process of forming the body unit 100 by fusing a plurality of bodies in the process of forming the buoyant body having a size of more than 200 mm.

In order to install the handle 210, the coupling process (S 513) is performed in a state in which one end of the handle 210 to be exposed to the outside of the body unit 100 is interposed between the respective body portions 110, 110 to each other. In the body unit 100 formed through the molding step S 510 including the above-described coupling process, the knob 210 embedded in the body unit 100 may be exposed at one end.

An attachment groove 170 may be formed in the coupling surface of the body 110 to insert one end of the handle 210 in step S 511 of forming the body 110 so that the handle 210 is installed . If the force applied when the user holds the handle 210 is in the z-axis direction, at least a portion of the mounting groove 170 may be formed to extend in an x-axis perpendicular to the z-axis, have. When the handle 210 is manufactured in accordance with the shape of the mounting groove 170, even if a force is applied in the z-axis direction, one end of the knob 210 embedded in the body unit 100 is inserted into the fitting surface of the body unit 100, It can be caught in the groove 170.

For example, in FIG. 3, the handle 210 is formed in an annular shape, and the installation groove 170 is formed in a bent shape in which a part of the handle 210 having a ring shape is received.

It is difficult to provide the annular handle 210 when the body unit 100 is integrally formed. However, according to the present embodiment in which the plurality of body portions 110 are combined to form the body unit 100, (210) can be easily installed between the respective body portions (110).

The intermediate step S 512 between the step S 511 of forming the body part 110 and the step S 513 of joining the body parts 110 includes a step Member can be installed.

For example, in the intermediate step S 512, identification means (not shown) of the body unit 100 may be installed on the coupling surface of the body 110 or inside the body 110. At this time, the inside of the body 110 may be the inside of the wall 190 or the receiving space 201.

The body unit 100 corresponding to the buoyant body may be provided in plurality on the water. At this time, the body units 100 can be managed separately from each other. Each body unit 100 may be provided with an identification means for independent management of each body unit 100. The identification means at this time may include an RFID tag or a wireless communication device.

Since the body unit 100 formed of foamed polypropylene has a smooth and hard surface, it is difficult to provide a separate identification means therein. However, in the embodiment in which the plurality of body parts 110 are formed and the body parts 100 are formed by joining the body parts 110, an intermediate step S 512, the identification means can be easily installed on the body portion 110. [

The identification means provided on the body portion 110 before the respective body portions 110 are coupled can be naturally accommodated in the body unit 100 when the respective body portions 110 are coupled to each other.

Meanwhile, in order to improve the durability of the body unit 100, a stiffener 140 may be added.

The stiffener 140 may be disposed inside or on the surface of the foamed polypropylene molded article such as the wall portion 190 or on the inner surface of the hollow 200 to reinforce the durability of the body unit 100.

5 is a flow chart illustrating another forming step of the present invention.

The forming step S 510 shown in FIG. 5 includes the steps of inserting the reinforcing member 140 into the mold 310 (S 515), injecting the foamed polypropylene into the mold 310 containing the reinforcing member 140, 0.0 > (S 516) < / RTI > That is, a stiffener 140 may be added to improve the durability of the body unit 100. The stiffener 140 may be disposed inside or on the surface of a molded polypropylene foam such as the wall 190 or on the inner surface of the body unit 100 facing the hollow 200. The stiffener 140 can reinforce the durability of the body unit 100.

The stiffener 140 may be installed on the inside or the surface of the body unit 100 due to the molding step of FIG. At this time, the reinforcing material 140 may include at least one of metal, synthetic resin, plastic, wood, carbon, fiber, nonwoven fabric, cloth, cement and stone.

On the other hand, a first expanded polypropylene and a second expanded polypropylene may be provided in which at least one of color, density and foam drainage is different. At this time, the second expanded polypropylene forms the body of the body unit 100, and the first expanded polypropylene forms the surface of the body unit 100. The following molding step can be performed so that the first expanded polypropylene is disposed on the surface of the body unit 100 composed of the second expanded polypropylene.

First, a step of inserting a first expanded polypropylene into a mold may be performed. Thereafter, the second foamed polypropylene can be injected into the mold in which the first foamed polypropylene is inserted and the body unit can be molded. The first foamed polypropylene may be included on the surface of the body unit 100 through the molding step.

FIGS. 12 to 15 are schematic views showing a process of forming a grip and a handle for a handle on the surface of a body unit, and FIG. 16 is a schematic view showing a moving means box of the present invention.

12 to 14 show a state in which a handle groove is formed on the surface of the body unit by using a moving means box.

The molding step S 510 includes the steps of mounting a moving means box 330 removable to the mold 310 to the mold 310, injecting the foamed polypropylene into the mold 310, and molding the body unit 100 , And demolding the body unit (100) from the mold (310).

At this time, the moving means box 330 can be integrated with the body unit 100 during the molding process of the body unit 100. For integration, the transfer means box 330 can be easily integrated into the body unit 100, and for example, ribs, feet, and rings can be provided.

In the step of molding the body unit 100, the moving means box 330 may be inserted into the surface of the body unit 100. The moving means box 330 mounted on the mold 310 may be detached from the mold 310 during the demoulding process of the body unit 100.

The transfer means box 330 may be for forming a fitting groove or a handle groove on the surface of the body unit 100. The moving means box 330 may be formed in a cylindrical shape having a receiving space 339 whose one side is open as shown in Fig. At this time, the accommodation space 339 of the moving means box 330 can function as a fitting groove or a handle groove. The transfer means box 330 can be inserted into the body unit 100 such that the receiving space 339 is exposed to the outside.

The moving means box 330 may be formed of various materials such as metal, polypropylene, etc., and may have a higher strength than the body portion 110.

The mold 310 may be provided with an entrance 319 for inputting and outputting steam or steam. In addition, a discharge port (not shown) through which water vapor is output may be provided on one surface of the mold 310 facing the body unit 100.

The water vapor introduced through the entrance port 319 of the mold 310 is discharged into the mold internal space through the discharge port and foamed polypropylene injected into the mold internal space can be foamed to form the body unit 110.

Since the moving means box 330 is an element inserted into the mold 310, it is preferable to pass water vapor for foaming the foamed polypropylene. A plurality of through holes 338 through which water vapor passes may be provided on the surface of the moving means box 330 so that water vapor may pass therethrough.

At this time, the through holes 338 of the moving means box are smaller than the particles of the foamed polypropylene, and the inflow of the foamed polypropylene into the inside of the moving means box 330 during the molding process can be suppressed.

The mold 310 may be provided with a first mounting portion 315 on which the moving means box 330 is mounted. The moving means box 330 may be provided with a second mounting portion 335 mounted on the first mounting portion 315.

12, a mold 310 for manufacturing one of a plurality of body portions 110 forming the body unit 100 is shown.

The mold 310 may include a first mold 311 and a second mold 312 coupled to each other. At this time, the first mold 311 and the second mold 312 can be moved along the first direction a. When the empty space of the moving means box 330 is filled in the molding process of the body 110, the body 110 is not demoulded from the first mold 311. However, since the diameter of the through-hole 338 formed in the transfer means box is smaller than the particle size of the foamed polypropylene, the body portion 110 can be easily demoulded from the first mold 311.

Specifically, the second mounting portion 335, which is a part of the moving means box 330, is mounted on the first mounting portion 315 before molding, and a moving means box 330 integrated with the body portion 110 during molding and demolding It can be demoulded.

On the other hand, the first mounting portion 315 may include a projection or a groove. Figs. 12 and 14 disclose a groove-shaped first mounting portion 315, and Fig. 13 discloses a projection-shaped first mounting portion 315. Fig.

When the first mounting portion 315 is formed in a groove shape, the second mounting portion 335 may be formed in a protrusion shape inserted into the first mounting portion 315. At this time, the projection may extend along the first direction a.

When the first mounting portion 315 is formed in a protruding shape, the second mounting portion 335 may be formed in a hole shape or a groove shape in which the first mounting portion 315 is inserted and inserted.

Referring to FIG. 14, it can be seen that the first mounting portion 315 can be applied to the mold 310 in which the body unit 100 itself is molded at one time. Specifically, it can be seen that the second mounting portion 335 is fixed to the first mounting portion 315 formed in a groove shape.

On the other hand, when the surface of the body unit 100 or the surface of the body portion 110 has a strength suitable for a hanging groove or a handle groove, the moving means box 330 corresponding to a separate member can be excluded.

Referring to FIG. 15, a handle groove is formed directly on the surface of the body 110 in a state in which the moving means box 330 is excluded. The first mold 311 and the second mold 312 may not move relative to each other along the first direction a when the whole body unit 100 is directly molded in the mold. Therefore, the embodiment in which the moving means box is excluded is suitable for an embodiment in which a plurality of body parts 110 are formed and then the body parts 110 are combined to form the body unit 100.

Specifically, the step of molding the plurality of body parts 110 includes the steps of: providing projections 317 protruding along the first direction a in the mold 310; injecting foamed polypropylene into the mold 310; And shaping the specific body part, and demolding the specific body part from the mold 310. [

In the step of molding the specific body part, a receiving space 339 corresponding to a tongue-shaped handle having one side opened by the projecting part 317 may be formed on the surface of the specific body part. When another body part is coupled to a specific body part, one opening part of the accommodation space 339 may be covered by another body part or may be faced to one opening part of the accommodation space (handle) formed in the other body part.

6 is a schematic view showing a buoyant manufacturing method for forming the hollow 200 using the stiffener 140. Fig.

The molding step S 510 shown in FIG. 6 includes the steps of inserting the stiffener 140 having the internal space 149 into the mold 310 (S 515), inserting the surface of the stiffener 140 and the inner surface of the mold 310 And injecting the foamed polypropylene into the body unit 100 (S 516).

The hollow 200 corresponding to the inner space 149 of the stiffener 140 may be formed in the body unit 100 formed through the forming step of FIG. At this time, the reinforcing member 140 forms the inner surface of the body unit 100 facing the hollow 200, and can reinforce the strength of the body unit 100.

It is preferable that means for generating heat is disposed on the side of the hollow 200 so that the inner surface of the body unit 100 is reliably formed. For example, a heat supply line 410 for supplying heat to the inner space of the stiffener 140 or the stiffener 140 may be additionally installed before the stiffener 140 is inserted into the mold 310 and the foamed polypropylene is injected. .

The buoyant manufacturing method for forming the hollow 200 using the stiffener 140 and the heat supply line 410 shown in FIG. 6 will be described in detail.

First, as shown in FIG. 6A, the stiffener 140 may be inserted into the mold. The mold 310 may be provided with a heat supply line 410 for injecting or applying heat or steam into the internal space 149 of the stiffener 140.

The stiffener 140 may be formed of a plate-shaped plate member or a member having a mesh structure such as a perforated mesh. At this time, the size of the hole formed in the stiffener 140 may be smaller than the particle size of the foamed polypropylene.

Foamed polypropylene may be filled between the surface of the stiffener 140 and the inner surface of the mold 310 as shown in FIG. 6 (b). At this time, one end of the heat supply line 410 from which the heat is discharged may be disposed in the internal space 149 of the stiffener 140.

6 (c) shows the molding process. When foamed polypropylene is injected between the reinforcing member 140 and the inner surface of the mold 310, heat can be injected into the inner space 149 of the reinforcing member 140 through the heat supply line 410. Steam may be injected into the heat supply line 410 disposed in the inner space 149 of the stiffener 140 to increase the pressure of the inner space 149 while supplying heat to the inner space 149. At this time, the pressure in the inner space 149, which is increased, can be used to resist the pressure externally applied through the mold, so that the phenomenon that the reinforcement 140 is protected or collapsed by the external pressure can be prevented.

6D shows a state in which heat is supplied to the inside of the stiffener 140 through the heat supply line 410 and heat is supplied to the outside of the stiffener 140 through the metal mold 310. [ Steam can pass through the inside of the mold 310, and the mold 310 can be heated by the steam at this time. Since the time and manner of heat supply to the inside and outside of the stiffener 140 vary depending on the expansion ratio, pressure and density of the foamed polypropylene and the specification of the body unit 100, detailed description thereof will be omitted herein .

FIGS. 6 (e) and 6 (f) show the demolding process of the body unit 100 after the molding is completed. After the molding is completed, the heat supply line 410 can escape from the mold 310 and the body unit 100. When the heat supply line 410 is withdrawn, the body unit 100 is left with a groove or hole 420 formed by the heat supply line 410. At this time, the groove or hole 420 may be closed by the watertight cap 430. The material and shape of the watertight cap 430 may be adaptively formed according to the shape and structure of the heat supply line 410 inserted into the stiffener 140. Preferably, the watertight barrier cap 430 is formed of foamed polypropylene. In this case, there is no need to separate the watertight cut-off cap 430 from the body unit 100 during recycling. Since the watertight cap 430 covers the same material as the body unit 100, it can be easily fused to the body unit by heat.

If the stiffener 140 is inserted into the wall portion 190 to increase the durability of the wall portion 190 purely and the stiffener 140 has a hole, the size of the hole is determined by the particle size of the foamed polypropylene . According to this structure, the lining constituting the wall portion passes through the reinforcing member, so that the durability of the wall portion is improved, and the reinforcing member can be inserted tightly into the wall portion.

Meanwhile, the stiffener 140 installed in the body unit 100 may be applied for other purposes. In one example, the stiffener 140 may be used to connect other members.

For example, a part of the stiffener 140 installed inside the body unit 100 may protrude outside the surface of the body unit 100. The end of the stiffener 140 protruding from the surface of the body unit 100 may be connected to another member such as a lid or the like.

7 is a schematic view showing a body unit 100 manufactured by another buoyant manufacturing method of the present invention.

In order to form the stiffener 140 used for connecting other members, the forming step may be performed as follows.

The forming step includes the steps of inserting one end of the stiffener 140 into the mold 310, injecting particles of the polypropylene resin into the mold 310 in which the one end of the stiffener 140 is accommodated and foaming the body unit 100 Step < / RTI >

One end of the stiffener 140 may be inserted into the body unit 100 and the other end of the stiffener 140 may protrude from the body unit 100. [

The other end of the stiffener 140 protruding from the body unit 100 may be used for connecting the other member 290 coupled to the body unit 100.

Also, one end of the stiffener 140 inserted into the body unit 100 can contribute to increase the durability of the body unit 100. [

On the other hand, even if the body unit 100 is made of polypropylene having a higher strength than polystyrene, it may be insufficient to protect the body unit 100 from a strong external impact such as a ship collision. When the body unit 100 is broken, the broken pieces can not be recovered, and therefore, they can be turned into marine litter as they are.

A high density layer 195 may be added to the body unit 100 for reliable protection of the body unit 100. The high density layer 195 may be applied to the surface of the body unit 100 regardless of the presence or absence of the hollow 200.

There is a method of forming a high density layer 195 on the surface of the body unit 100 by using a separate polypropylene film but a polypropylene film must be provided separately from the body unit 100, There is a problem that productivity is low because a process of sticking the polypropylene films to each other has to be added. In addition, since the particle size of the foamed polypropylene of the body unit 100 and the particle size of the polypropylene film are significantly different, the adhesive force may be weak.

The body unit 100 manufactured through the molding step S 510 may be composed only of foamed polypropylene. As a result, the wall portion 190 constituting the body unit 100 may be made of only foamed polypropylene.

8 is a schematic view showing the melting step of the buoyant manufacturing method of the present invention.

The method of manufacturing the buoyant body of the present invention may include a melting step (S 520) of heating the surface of the body unit 100 so that the surface containing the foamed polypropylene is melted in the body unit 100.

The melting step (S 520) may be performed after the body unit (100) is formed through the molding step (S 510).

8, heat may be applied to the surface of the body unit 100 such as the wall unit 190, instead of adding a film or the like provided separately from the body unit 100.

Foamed polypropylene can be melted when heat is applied. The thermally foamed polypropylene is very small in particle size, forming a solid, dense layer 195 of very small particles combined after cooling. That is, in the present invention, the high-density layer 195 is formed by using the foamed polypropylene particles (foamed beads) located on the surface of the body unit 100 of the foamed polypropylene used for forming the body unit 100, It may be solidified after solidification.

The body unit 100 may be provided with a center layer 197 disposed closer to the inner center of the body unit 100 than the high density layer 195. The center layer 197 and the high density layer 195 may comprise foamed polypropylene used in the molding of the body unit 100.

The high-density layer 195 may be formed by melting the foamed polypropylene by heat applied from the surface side of the body unit 100 and then solidifying it. On the other hand, the center layer 197 may not be able to transfer the heat applied from the surface side, so that the initial foaming state of the foamed polypropylene is maintained.

In fact, the particle size of the foamed polypropylene may gradually increase from the surface of the body unit 100 toward the center of the body unit 100. At this time, the portion where the particle size gradually changes may become the high-density layer 195. The particle size of the foamed polypropylene gradually increases from the center to the center, and the particle size can be kept constant from a specific position. The center layer 197 can maintain the constant size.

It is obvious that the bonding force is increased because the high-density layer 195 and the center layer 197 are bound to each other by the particles of the foamed polypropylene gradually changing in size.

The surface of the body unit 100 may be heated to 130 to 300 DEG C to form a high density layer 195 whose particle size of the expanded polypropylene is gradually changed.

According to the experimental results, when the surface of the body unit 100 is heated to less than 130 캜, it is difficult to sufficiently reduce the particle size of the high-density layer 195. In addition, there was a problem that the surface of the roughened body unit 100 was depressed. On the other hand, when the surface of the body unit 100 is heated to more than 300 ° C, the liquid in which the foamed polypropylene melts flows freely, and the surface shape of the body unit 100 often changes. Also, high temperature caused burning of polypropylene foam.

On the other hand, it was confirmed that when the heat of 130 ° C. to 300 ° C. is applied, the high-density layer 195 is formed on the surface of the body unit 100 while the surface shape of the body unit 100 is maintained close to the original shape.

The foamed polypropylene forming the high density layer 195 is reduced in size so that the diameter of the body unit 100 can be reduced by g after the melting step S 520.

Therefore, when the diameter of the initially designed body unit 100 is e, it is preferable to generate the body unit 100 with a diameter larger than e in consideration of g in the molding step.

The case where the hollow 200 is provided in the body unit 100 may be as follows.

The wall portion 190 formed by the hollow 200 has a center layer 197 disposed at a first position 1 close to the hollow 200 in the thickness direction and a center layer 197 disposed at a position distant from the hollow portion 200 And a high density layer 195 disposed at the second position (2).

The high density layer 195 may be a part of the foamed polypropylene constituting the wall part 190 by melting applied after heat from the surface side of the wall part 190 and then solidifying.

The center layer 197 may be such that the initial foaming state of the foamed polypropylene is maintained due to the untransferred heat applied from the surface side of the wall portion 190.

The high density layer 195 may have a very small particle size as compared to the center layer 197. The adhesion or adhesion between the high density layer 195 and the center layer 197 may be a problem due to the difference in particle size, but there is no problem in practice. Although the laminated structure of the wall portion 190 is described as being divided into the high density layer 195 and the center layer 197 for the sake of convenience of description, the high density layer 195 is actually formed from the surface side of the wall portion 190 The particle size gradually increases toward the inner side.

Due to the progressively varying particle size, the high-density layer 195 and the center layer 197 are in almost the same state as one. Strong impact resistance can be realized according to the wall portion 190 whose particle size gradually increases from the surface to the inner surface. Even if the surface of the body unit 100 is broken due to a very strong impact, the broken pieces can be kept attached to the inner central layer 197 without being released to the outside.

That is, in the present invention, the high-density layer 195 is kept substantially in a state of being integral with the inner center layer 197 due to a strong coupling force, so that there is no phenomenon of being separated from the center layer 197 due to an external impact. In addition, since the particle size of the high-density layer 195 is very small, a solid yet smooth surface can be provided. Therefore, there is less concern that sea creatures such as barnacles, crabs, etc. are digging.

In the melting step (S 520), the surface of the body unit (100) can be melted using external heat or the heat of the mold (310).

For example, the surface of the body unit 100 may be melted by a heat source such as a heater spaced from the body unit 100. The inventor of the present invention has attempted to melt the heated hot plate while directly contacting the surface of the body unit 100 with the heated hot plate. However, in many cases, the melted foamed polypropylene is deposited on the heating plate when the heating plate is released. Thus, it has been concluded that the heat source should be spaced from the surface of the body unit 100. [

As another example, a case where the surface of the body unit 100 is melted by heating the metal mold 310 closely attached to the body unit 100 will be described. It is preferable that a mold release agent is interposed between the mold 310 and the body unit 100 so that the mold 310 and the body unit 100 are separated well.

17 is a schematic view showing a state in which the high density layer 195 is formed using the mold 310. FIG.

When the first mold 311 and the second mold 312 are provided, the first mold 311, which faces the surface of the body unit 100 or the body 110, It can be heated to a high temperature.

For example, steam or steam at 140 ° C is supplied to the first mold 311 and the second mold 312 for foaming the foamed polypropylene, and then the foamed polypropylene is injected into the first mold 311 Steam or steam at 170 ° C or higher can be further fed to melt. At this time, since the high temperature steam can not be directly supplied to the foamed polypropylene accommodated in the mold, the inner surface of the first mold 311 facing the body 110 may be clogged. At this time, the first mold 311 is heated due to the high-temperature steam, and the surface of the body unit 100 or the body 110 is melted to form the high-density layer 195.

The thickness of the body unit 100 is reduced due to melting of the surface. At this time, when the thickness of the body unit 100 begins to decrease, the metal mold 310 is continuously moved toward the body unit 100 or in a direction to press the body unit 100, . The surface of the body unit 100 or the body 110 can maintain the shape of the initial design value due to the mold continuously adhering to the body unit 100 while the thickness is changed.

In the case of the body portion 110, the surface fusion can be progressed individually. At this time, the portion which is melted by forcibly pushing in the opposite direction to the molten metal mold can be supplemented

Referring back to FIG. 8, the surface of the body unit 100 may be irregularly changed through the melting step (S 520).

It is preferable to add a surface treatment step (S 530) for surface-treating the surface of the irregularly-shaped body unit 100.

The surface treatment step (S 530) can surface-treat the surface of the body unit 100 in a molten state using a jig.

Due to melting, the surface of the body unit 100 may have a shape different from the initial design value. The initial design values may include various specifications of the product set by the user before the product is manufactured. For example, the initial design value was a smooth surface, but the surface could become uneven due to melting.

The jig is brought into close contact with the surface of the body unit 100 in a molten state and the surface shape of the body unit 100 can be corrected to the initial design value. In addition, the jig can also function as a cooling plate for cooling the molten expanded polypropylene. The jig can be escaped from the body unit 100 after the surface of the body unit 100 is hardened to some extent.

The body unit manufactured through the present invention may have a higher flatness or have a smooth surface due to the melting step.

In order to smooth the surface of the body unit 100, the jig may have a smooth surface. Further, it is preferable that the jig includes a material that does not allow the molten expanded polypropylene to come in.

The jig can be heated due to the heat of the body unit 100 during the surface treatment of the body unit 100. The heated jig may be fused with molten expanded polypropylene similar to a hot plate. Therefore, in the surface treatment step (S 530), a step of cooling the jig escaped from the body unit 100 may be added so that the jig is not raised above the set temperature.

A crosslinking step (S 540) may be added so that the foamed polypropylene of the body unit 100 after the surface treatment step (S 530) is reliably cured.

The crosslinking step S 540 may include a step of irradiating at least one of electron beam, ultraviolet ray, infrared ray and radiation to the surface-treated body unit 100 and crosslinking or curing the body unit 100. When the jig performing the surface treatment step (S 530) includes a transparent material, the cross-linking step may be performed while the jig covers the body unit. For example, when the ultraviolet rays are projected while the jig is in close contact with the body unit, the projected ultraviolet rays can pass through the transparent jig and can be mounted on the body unit.

It is preferable that the crosslinking step is performed after the surface treatment step S 530 since the body unit 100 is hardened through the crosslinking step S 540.

Meanwhile, the molding step S 510 may include forming the bending line 101 and the pocket 109 on the surface of the body unit 100.

A wire 280 (not shown) connected to the mounting means 260 may be wound around the body unit 100 to install the body unit 100 in water or to transfer the body unit 100. At this time, the body unit 100 may be damaged due to the strong pressure of the wire 280. However, according to the high-density layer 195, the surface of the body unit 100 increases in firmness.

The body unit 100 may be in a solid and smooth surface with a high density layer 195 formed by heat treatment of the surface. In the case of polystyrene, when the wire 280 is wound with a strong force, the wire 280 can penetrate the surface, but due to the high-density layer 195 having a high strength and high strength, the wire 280 will pierce the body unit 100 It is difficult to lift.

In addition, since the high-density layer 195 keeps the surface of the body unit 100 smooth, it is more difficult to wind the wire 280.

The body unit 100 may be provided with a seat for installing the wire 280 for installing the wire 280. The installation position of the wire 280 may correspond to the bending line 101. [

FIG. 9 is a schematic view showing a state in which a wire 280 is wound on a body unit 100 manufactured by the buoyant manufacturing method of the present invention.

The bending line 101 may include a groove-shaped rib formed along the line on which the wire 280 is wound to the body unit 100.

The bending line 101 and the pocket 109 may be in a hard and smooth state since they have a high density layer 195 like the wall portion 190 while passing through the melting step S 520 and the surface treatment step S 530 . However, since the bending line 101 is a groove provided at a position where the wire 280 is wound, the wire 280 can be easily wound on the body unit 100 in a manner of being inserted into the bending line 101. In addition, the bending line 101 can prevent the wire 280 from being separated.

The wire 280 wound on the bending line 101 can be tightly tightened to prevent it from being separated. Due to the tightened wire 280, it may be difficult for the attachment means 260 such as a ring to be inserted between the wire 280 and the body unit 100. In the case of the conventional polystyrene molded body, even if the wire 280 is tightly wound, the molded body can be easily inserted into the mounting means 260, so that the mounting means 260 can be connected to the wire 280 without any difficulty. However, the body unit 100 formed of foamed polypropylene is hard to penetrate the surface.

A pocket 109 may be used to easily connect the body unit 100 to the underside, the vessel, or other supporting means, such as an attachment means 260, etc., to the wire 280.

The pocket 109 may include a groove formed in a specific portion of the bending line 101.

The width and depth of the pocket 109 may be greater than the width and depth of the bending line 101.

The pocket 109 may be a deeper and larger groove than the bending line 101 located in the bending line 101. Therefore, a clearance through which the mounting means 260 can pass can be formed between the wire 280 passing through the pocket 109 and the wire.

The user may insert the mounting means 260 into the gap between the wire 280 formed by the pocket 109 and the body unit 100 and connect the mounting means 260 to the wire 280.

10 is a sectional view showing a wall portion 190 of the body unit 100. Fig.

The bending line 101 may have a groove shape having a size to accommodate the wire 280 wound around the body unit 100.

By the way, according to the groove-shaped bending line 101, the thickness of the wall portion 190 where the bending line 101 is formed can be thinned. External force applied to the wire 280 wound on the body unit 100 may be transmitted to the bending line 101 as it is. If the bending line 101 is thinner than the other portion, the body unit 100 may be damaged.

The partition 180 may be provided at a position facing the bending line 101 from the inner surface of the body unit 100 in order to prevent damage due to tightening of the wire 280 or the like. The barrier ribs 180 may be thicker than the wall portions 190 thinned due to the bending lines 101. The width D2 of the partition 180 may be greater than the width D1 of the bending line 101 to compensate for the thickness of the wall portion 190. [ D2 is preferably determined within a range in which the thickness D3 of the thinnest section between the bending line 101 and the partition 180 is two thirds or more of the thickness of the wall section 190. [

It is also preferable that the protruding length H2 of the partition wall 180 is larger than the depth H1 of the bending line 101. [ For example, when the wire 280 is wound on the outer circumferential surface of the annular ring, if the thickness of the ring is thin, the shape of the ring may be distorted by the wire 280. On the other hand, if the thickness of the ring is thick, the ring can maintain its original annular shape despite the tightness of the wire 280. At this time, the protruding length H2 of the partition 180 may be related to the thickness of the annular ring. Therefore, if H2 is sufficiently large, the body unit 100 can maintain its original shape despite the tightness of the wire 280. If H2 is larger than H1, a sufficient supporting force can be provided since the thickness D4 from the bottom of the bending line 101 to the end of the partition 180 is larger than the thickness of the wall portion 190. [

On the other hand, when the partition 180 protruding from the inner surface of the one side wall portion 190 extends to the inner surface of the other side wall portion 190, it is possible to reliably prevent the hollow 200 from collapsing due to external force. It is also possible to arrange the partition 180 protruded from the specific wall portion 190 and the partition 180 protruded from the other wall portion 190 at a specific point of the hollow 200.

According to the partition wall 180, it is possible to reliably prevent the shape of the body unit 100 from being deformed by an external force applied by the wire, because it is similar to the case where the wire 280 is wound around the outer periphery of the disk.

11 is a schematic view showing a cross section of the body unit 100. Fig.

The body unit 100 of FIG. 11 may include a plurality of body portions 110 provided separately for convenience of manufacture.

For example, when the protrusion-shaped partition 180 is provided on the inner surface of the body unit 100, it is difficult to integrally form the body unit 100 using an insert core or the like during the foaming process using the mold 310.

When the body unit 100 is divided into a plurality of body parts 110 and the coupling surfaces of the two body parts 110 are formed perpendicular to the protrusion direction of the partition wall 180, The barrier ribs 180 may be formed. 11, the partition 180 extends along the z-axis direction, and the coupling surface extends along the x-axis. The respective body portions 110 formed in the mold 310 move in the positive or negative direction of the z axis and can be easily separated from the mold 310. [

The partition walls 180 of the respective body portions 110 may protrude parallel to each other to the coupling surface.

At this time, the partition 180 of each body 110 may have the same coordinate value in the x-axis direction. Accordingly, when the respective body portions 110 are coupled, the partition walls 180 can be brought into close contact with each other at the coupling surfaces. When the bending line 101 or the pocket 109 is formed on the opposite side of the surface of the body portion 110 where the barrier ribs 180 are formed, the body unit 100 is warped .

The body unit 100 or the buoyant body manufactured by the above-described buoyant body manufacturing method may be entirely composed of foamed polypropylene. Also, a high-density layer 195 formed by melting the wall portion 190 may be present on the surface. The particle size of the foamed polypropylene constituting the wall portion 190 of the body unit 100 may gradually increase toward the center of the body unit 100.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

10 ... polystyrene buoy 100 ... body unit
101 ... bending line 109 ... pocket
110 ... body portion 140 ... stiffener
149 ... interior space of stiffener 170 ... installation groove
180 ... partition wall 190 ... wall portion
195 ... high density layer 197 ... center layer
200 ... hollow 201 ... housing space
210 ... handle 260 ... installation means
280 ... wire 290 ... other member connected to the body unit
310 ... mold 410 ... heat supply line
430 ... Watertight cap

Claims (28)

A molding step of molding a body unit floating in water with expanded polypropylene (EPP);
And a melting step of heating the surface of the body unit so that the surface containing the foamed polypropylene is melted in the body unit,
The foamed polypropylene is molded into the body unit through a mold,
The body unit forms an outer shape of a floating body floating in water,
Wherein the melting step melts the surface of the body unit using heat of the mold or a heat source spaced from the surface of the body unit.
The method according to claim 1,
Wherein the forming step comprises forming a wall having a set thickness within a range of 200 mm and a hollow surrounded by the wall using the foamed polypropylene,
Wherein the total diameter of the body unit exceeds the set thickness by the hollow and the wall.
The method according to claim 1,
Wherein the molding step comprises molding a plurality of body parts with the foamed polypropylene, and joining the body parts together to form the body unit,
The body portion includes a wall portion having a predetermined thickness within a range of 200 mm, and an accommodation space surrounded by the wall portion and opened at one side,
The plurality of body portions are coupled with the wall portions,
Wherein when the wall portion is coupled, the wall portion forms a surface of the body unit, and the receiving space is coupled to each other to form a hollow in the body unit.
The method of claim 3,
And the end portion of the wall portion serving as the engaging surface is formed thicker than the other portion of the wall portion.
The method according to claim 1,
Wherein the molding step comprises molding a plurality of body parts with the foamed polypropylene, and joining the body parts together to form the body unit,
Wherein the body portion includes a wall portion, a housing space surrounded by the wall portion and having one side opened, and a partition wall protruding from the inner surface of the accommodation space toward the one side opening,
Wherein the plurality of body portions are coupled with each other during the coupling process.
The method according to claim 1,
Wherein the molding step comprises molding a plurality of body parts with the foamed polypropylene, and joining the body parts together to form the body unit,
Wherein the joining between the body portions is performed by pressing the joining faces of the body portions together while the joining faces of the body portions including the foamed polypropylene are melted due to heating at 130 ° C or more.
The method according to claim 1,
The molding step may include forming the first body part and the second body part with the foamed polypropylene, and forming the body unit by joining the first body part and the second body part together,
A first concavo-convex portion is formed on a coupling surface of the first body portion during molding,
And a second concavo-convex portion to be fitted to the first concavo-convex portion is formed on a coupling surface of the second body portion in the molding process.
The method according to claim 1,
Wherein the molding step comprises molding a plurality of body parts with the foamed polypropylene, and joining the body parts together to form the body unit,
The coupling between the body portions may be formed integrally with the coupling surface of the body portion, or the plate portion interposed between the coupling surfaces of the respective body portions may be melted by heating at 170 DEG C or more, or heated to 130 DEG C or more between the coupling surfaces of the respective body portions Wherein the engagement surfaces of the respective body portions are pressed together with the liquid resin interposed therebetween,
Wherein the plate portion or the liquid resin includes polypropylene.
The method according to claim 1,
The molding step may include forming a plurality of body parts with the foamed polypropylene, combining the body parts with one end of the handle to be exposed to the outside of the body unit, , ≪ / RTI >
Wherein the handle is exposed at one end of the body unit formed through the molding step.
The method according to claim 1,
The forming step includes the steps of forming a plurality of body parts with the foamed polypropylene, disposing the identification unit of the body unit on the coupling surface of the body part or inside the body part, combining the body parts to form the body unit , ≪ / RTI >
Wherein the identification means provided on the body portion before the coupling of the respective body portions is accommodated in the body unit when the respective body portions are coupled to each other.
The method according to claim 1,
The molding step includes the steps of inserting a reinforcing material into the mold, injecting the foamed polypropylene into the mold containing the reinforcing material, and molding the body unit,
The stiffener is installed on the inside of the body unit or on the surface of the body unit due to the molding step,
Wherein the reinforcing material comprises at least one of metal, synthetic resin, plastic, wood, carbon, fibrous material, nonwoven fabric, cloth, cement, and limestone.
The method according to claim 1,
Wherein a first foamed polypropylene and a second foamed polypropylene are provided in which at least one of color, density,
Wherein the molding step comprises the steps of: inserting the first foamed polypropylene into the mold; injecting the second foamed polypropylene into the mold into which the first foamed polypropylene is inserted and molding the body unit;
Wherein the first foamed polypropylene is contained on a surface of the body unit through the molding step.
The method according to claim 1,
The molding step includes the steps of mounting a moving means box removable to the mold to the mold, injecting the foamed polypropylene into the mold, molding the body unit, and releasing the body unit from the mold and,
In the step of molding the body unit, the moving means box is inserted into the surface of the body unit,
Wherein the moving means box mounted on the mold is detached from the mold in the demolding process of the body unit.
14. The method of claim 13,
Wherein the moving means box is formed in a tubular shape having a receiving space having one side opened and inserted into the body unit such that the receiving space is exposed to the outside,
Wherein a plurality of through holes through which water vapor for foaming the foamed polypropylene is provided are formed on the surface of the moving means box.
14. The method of claim 13,
Wherein the mold is provided with a first mounting portion on which the moving means box is mounted,
The moving means box is provided with a second mounting portion mounted on the first mounting portion,
Wherein the mold includes a first mold and a second mold coupled to each other,
The first mold and the second mold move relative to each other,
Wherein the first mounting portion includes protrusions or grooves extending along the relative movement direction so that the second mounting portion is prevented from being caught by the first mounting portion during the demoulding process of the body unit.
The method according to claim 1,
Wherein the molding step comprises molding a plurality of body parts with the foamed polypropylene, and joining the body parts together to form the body unit,
The step of molding the plurality of body parts may include the steps of providing protruding protrusions on the mold, injecting the foamed polypropylene into the mold, molding the body part, and releasing the body part from the mold ,
And a groove-shaped handle having one side opened by the protrusion is formed on the surface of the body part in the step of molding the body part.
The method according to claim 1,
Wherein the molding step includes the steps of inserting a reinforcing member formed to have an inner space into a mold, injecting the foamed polypropylene between the surface of the reinforcing member and the inner surface of the mold, and molding the body unit,
Wherein a hollow corresponding to an inner space of the reinforcing member is formed in the body unit formed through the molding step.
18. The method of claim 17,
And a heat supply line for supplying heat to the inner space of the reinforcing material or the reinforcing material is further provided before the reinforcing material is inserted into the metal mold and before the foamed polypropylene is injected.
19. The method of claim 18,
Wherein when the foamed polypropylene is injected between the surface of the reinforcing member and the inner surface of the mold, heat is injected into the inner space of the reinforcing member through the heat supply line, and the body unit is molded.
The method according to claim 1,
The molding step includes the steps of: inserting one end of a reinforcing member into a mold; injecting the foamed polypropylene into the mold containing one end of the reinforcing member and molding the body unit;
One end of the reinforcing member is inserted into the body unit due to the molding step, the other end of the reinforcing member is protruded from the body unit,
Wherein the other end of the reinforcing member protruding from the body unit is used for connecting another member coupled to the body unit.
delete The method according to claim 1,
And irradiating at least one of electron beam, ultraviolet ray, infrared ray, and radiation onto the surface of the molten body unit, and bridging the body unit.
The method according to claim 1,
And surface treating the surface of the body unit in a molten state using a jig,
The jig is in close contact with the surface of the body unit in a molten state,
And the jig is escaped from the body unit after the surface of the body unit is hardened.
24. The method of claim 23,
The jig includes a transparent material through which ultraviolet rays can pass,
Wherein a cross-linking of the body unit is performed by irradiating ultraviolet rays passing through the jig.
The method according to claim 1,
Wherein the melting step comprises melting the surface of the body unit through heating of the mold,
The thickness of the body unit is reduced due to melting of the surface,
Wherein when the thickness of the body unit begins to decrease, the metal is continuously moved toward the body unit and is closely contacted with the body unit.
The method according to claim 1,
The forming step includes forming a bending line and a pocket on a surface of the body unit,
Wherein the bending line is formed along a line through which the wire is wound on the body unit,
The pocket including a groove formed in a portion of the bending line,
Wherein the width and depth of the pocket are greater than the width and depth of the bending line.
delete A buoyancy body produced by the method of any one of claims 1 to 20, 22 to 26.
KR1020160013634A 2016-02-03 2016-02-03 METHOD FOR PREPARING Expanded PolyPropylene BUOYANCY MEMBER KR101853824B1 (en)

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