KR101191376B1 - Environmentally friendly method for manufacturing buoys - Google Patents

Abstract

PURPOSE: An environment-friendly buoy manufacturing method is provided to reduce the corrosion of the buoy caused by sea wave, salt water, and sun light. CONSTITUTION: An environment-friendly buoy manufacturing method is formed by a two forming films(1-1) and a vacuum pipe. The forming films vacuum-molded in order to prevent the generation of bubbles on the buoy are located in a projection-formed lower mold(65). Minute holes are formed on the forming films by a projection-formed upper mold(55). The edges of the forming film comprising minute holes are arranged to be faced with each other and input to a forming frame. The forming frame is heated in 100 to 200°C and shrunken on and thermally fused on the buoy.

Description

How to make eco-friendly buoys. {Environmentally friendly method for manufacturing buoys}

 The present invention provides a variety of marine activities that require buoyancy and cushioning of materials including marine fishery markings such as aquaculture farms, fishery markings, net markings, buoys for safe navigation of ships, and various life preservers for the safety of the crew. The present invention relates to a method for manufacturing an environmentally friendly buoy.

Also known as a buoy, or buoy, anchor buoy, bell buoy, can buoy, lighted buoy, mooring buoy, nun buoy Maritime fisheries such as buoys), spar buoys, life buoys, life buoys, etc. It is installed to warn of the presence of dangerous goods, and it is connected to the seabed by chains so that it does not float out. In particular, it installs lamps for night use.

 It is also used to indicate the location of objects in water, such as fishing gear and anchors.

 On the other hand, in the prior art of buoy manufacturing, a synthetic water support material such as EVA and PVC is mixed with a conventional additive raw material including a foaming agent, a crosslinking agent and the like, and the mixed raw material is prepared into a plate-shaped molded product and the manufactured molded product is pulverized to form a chip state. To a buoy-shaped mold to prepare the pulverized chip, and to pressurize and heat the buoy-shaped mold to produce EPS foam beads, which is a kind of synthetic resin foam beads. It is also manufactured through a manufacturing method of filling and expansion molding.

 For example, Korean Laid-Open Patent Publication No. 1020110053305 (20110520) and Publication No. 1020110059913 (20110608) are buoys prepared by expanding the beads type synthetic resin beads (beads type) and the buoys prepared above Buoys prepared by further constructing a coating layer on the surface are disclosed,

  Publication No. 1020010076084 (20010811) discloses a rich external material by extruding a resin selected from durable high density polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, nylon and ABS resin. In order to make the rich of foam by filling the inside of the rich with polyurethane or filling with foamed resin waste, it is easy to detach the fish and shellfish due to the high density of the surface and excellent buoyancy and durability compared to the case of using a single foam. It describes a method for producing a dual structure rich to be used for a long time,

Publication No. 1019980067833 (19981015) includes a plurality of urethane resin moldings 13 that are injection molded in a predetermined shape and are symmetrically attached to each other; A waste spiropol sphere 11 disposed in the urethane resin mold 13; It is characterized in that it consists of a foamed urethane stock solution layer 12 is formed by filling in the urethane resin mold 13 attached symmetrically to each other, in the manufacturing method of the aquaculture aquaculture mould, injecting a urethane resin into the mold Forming a urethane resin mold (100); A step (101) of inserting a waste spiropol sphere between the plurality of urethane resin molds produced by the injection molding, and precisely attaching abutting portions of the urethane resin molds; Aquaculture culture parts and manufacturing method is disclosed, comprising the step (102) of forming a foamed urethane stock solution by injecting a foamed urethane stock solution through the foamed urethane stock solution inlet formed in the mutually attached urethane resin casting,

  In Korea Patent Publication No. 1009855730000 (20100929), even though it does not separate screening for the various synthetic resins, it is possible to recover the physical properties through the use of additives to form waste rubber and mixed materials and use them as buoys. It provides a buoy and a luminous buoy of a mixed material of waste rubber and synthetic resin, which is very economical and environmentally effective in terms of recycling waste resources.

  Korean Patent Publication No. 1010651160000 (20110907) discloses a fish farm rich with 60-80% by weight of EVA resin and 20-40% by weight of NBR having a whole body having a final rich form in one foaming; 60 to 80% by weight of EVA resin and 20 to 40% by weight of NBR are added to the mold to form a preform having a final rich form, the mold is heated to 130 to 170 ° C, and 20 to The manufacturing method of the rich for aquaculture including a second step of foaming for 40 minutes is disclosed,

  In Korea Registered Utility Model Publication No. 2002779650000 (20020529), a urethane waterproofing fabric is coated on the surface of the Styropole to prevent the Schiropol from being exposed to sea salt or the sun. It is widely used in fishing nets and designed to prevent oxidation and to prevent damage to friction and to prevent the Schiropole from floating in the sea while extending the life of the Schiropole buoy. It can be seen that it is open to the public.

Prior art literature

Patent literature

 1. Domestic Publication No. 1020110053305

 2. Korean Patent Publication No. 1020110059913

 3. Korean Patent Publication No. 1020010076084

 4. Korean Patent Publication No. 1019980067833

 5. Korean Patent Registration Publication No. 100985573

 6. Korean Patent Registration Publication No. 101065116

 7. Registered Utility Model Registration No. 2002779650000 in Korea

In the case of buoy manufactured using conventional EVA, PVC, etc. as a raw material, the disadvantages of the manufacturing cost caused by the complicated manufacturing process

In the case of buoy manufactured by using EPS as a raw material, it is easily oxidized to ultraviolet rays, and is disadvantageous in that it is uneconomical with poor durability due to its weakness of flame resistance and chemical resistance, and waste contaminates the ocean.

형상의 폴리프로필렌재질의 성형필름을 두 개를 서로 마주보게 위치하여 내부에 폴리프로필렌으로 발포된 폴리프로필렌발포제품을 넣어 열융착 시켜 제조하며, 커버용 성형필름은 녹는점 및 연화점(SOFTNING POINT)과의 관계를 고려하여 온도는 변화가 가능하게 하여 제조하며, 커버용 성형필름의 성형시에도 필름의 두께 및 재질에 따라 성형이 가장 안정한 온도로 변화시켜 제조하는 친환경 부표의 제조방법을 제공하는 것이 본 발명이 이루고자 하는 과제 해결수단인 것이다.In order to solve the above problems, the present invention

It is manufactured by heat-sealing polypropylene foamed products with polypropylene foam inside by placing two shaped polypropylene shaped films facing each other. The molded film for cover has a melting point and a softening point. In consideration of the relationship between the temperature is made to be possible to change, and even in the molding of the cover molding film to provide an environmentally friendly buoy manufacturing method to change the molding to the most stable temperature according to the film thickness and material. The invention is to solve the problem to be achieved.

 The present invention is to apply the polypropylene film to the surface of the buoy molded from polypropylene foam, thereby reducing the phenomenon of corrosion by waves, salt water, sunlight, etc. to improve the weather resistance, chemical resistance, solvent resistance and strength of the buoy. At the same time, it contributes to the prevention of marine pollution, is 100% recyclable after use, and provides economic, eco-friendly, and human safety, which provides the effect of not generating toxic gas when incinerated for disposal. .

1 is an environmentally friendly buoy manufacturing process diagram by vacuum molding of the present invention
Figure 2 eco-friendly buoy manufacturing process drawing by injection molding of the present invention

형상의 폴리프로필렌재질의 성형필름을 두 개를 서로 마주보게 위치하여 내부에 폴리프로필렌으로 발포된 폴리프로필렌발포제품을 넣어 열융착 시켜 제조하며, 커버용 성형필름은 녹는점 및 연화점(SOFTNING POINT)과의 관계를 고려하여 온도는 변화가 가능하게 하여 제조하며, 커버용 성형필름의 성형시에도 필름의 두께 및 재질에 따라 성형이 가장 안정한 온도로 변화시켜 제조하는 친환경 부표의 제조방법에 관한 것이다. In order to achieve the above object, the present invention

It is manufactured by heat-sealing polypropylene foamed products with polypropylene foam inside by placing two shaped polypropylene shaped films facing each other. The molded film for cover has a melting point and a softening point. In consideration of the relationship between the temperature is made to be possible to change, and when forming a cover molding film relates to a method of manufacturing an eco-friendly buoy to change the molding to the most stable temperature according to the film thickness and material.

  As the film used in the present invention, a polypropylene film is used, and a pigment may be added to a desired color as necessary.

The present invention is to apply a polypropylene film to the surface of the buoy formed of polypropylene foam, there is an advantage that contributes to the prevention of marine pollution by reducing the phenomenon of corrosion by waves, salt water, sunlight, and the like.

형상으로 40~120 ℃에서 진공 성형한 다음, According to the present invention, a method of manufacturing a buoy using a film by vacuum forming is made of a polypropylene film in between, and the upper mold is lowered to the lower mold and at the same time the film is vacuumed in the upper and lower mold vacuum suction tubes.

Vacuum-molded at 40-120 ° C. into the shape,

 After the two molding films are vacuum formed as described above,

 Form a hole in the lower part of the molded film so that bubbles do not occur in the buoy, but make a small hole so that the molded film does not break during operation. (The more holes, the less bubbles are generated.)

 Make a molding frame for molding so that the molding film matches the buoy, but in consideration of the shrinkage rate, make the mold about 1 ~ 10% less than the volume of the buoy.

As described above, the edges of the two molded films having fine holes formed thereon are symmetrically contacted with each other, and then embedded in a mold, and then embedded in the mold.

  First, pressurization

  When the mold is placed in an oven and heated to 100 ~ 220 ℃, the molded film shrinks toward the buoy and sticks to the buoy. The air is injected at a pressure of 0.5 ~ 2kgf / ㎠ with a compressor so as to be in close contact with the buoy. At this time, if the pressure is too high, the mold may be twisted, so be careful.

  In the second method, the film is completely wrapped around the outside of the buoy, and then placed in a molding mold. First, the edges are heated to a temperature of 100 to 180 ° C. to heat-bond the edges, and then the mold is attached while the edge is attached. When placed in an oven and heated to 100 ~ 220 ℃, the molded film shrinks toward the buoy to be in close contact with the buoy.

Alternatively, as a method of molding a film by injection molding,

형상으로 40~180 ℃에서 사출 성형한 다음, 상기와 같이 사출 성형된 두 개의 성형필름을 제조한 후에, 부표에 기포가 발생하지 않도록 성형필름의 하부에 구멍을 형성하되 미세한 구멍을 뚫어 작업시 성형필름이 끊어지지 않도록 하며, (구멍 개수는 많을수록 기포 발생이 적음) 구멍이 형성된 성형필름에 제조한 후에, The film using the injection machine

After injection molding at a shape of 40 ~ 180 ℃, after manufacturing the two injection-molded film as described above, forming a hole in the lower part of the molded film so as not to generate bubbles in the buoy, but when forming a small hole when working The film is not broken (the larger the number of holes, the less bubbles are generated), and after manufacturing into the formed film with holes,

 Make a molding frame for molding so that the molding film is matched with the buoy, but in consideration of the shrinkage rate, the mold is made 1-10% less than the volume of the buoy.

As described above, the edges of the two molded films having fine holes formed thereon are symmetrically contacted with each other, and then embedded in a mold, and then embedded in the mold.

  Third, when the mold is put into the oven by heating method and heated to 100 ~ 220 ℃, the molding film shrinks toward the buoy and sticks to the buoy, and air is injected at a pressure of 0.5 ~ 2kgf / ㎠ with a compressor, so that it adheres to the buoy. To be At this time, if the pressure is too high, the mold may be twisted, so be careful.

In the fourth method, the film is completely wrapped around the outside of the buoy, and then placed in a molding mold. First, both sides are heated to a temperature of 100 to 180 ° C. to heat-bond the edge, and then the edge is attached. When the mold is put in an oven and heated to 100 ~ 220 ℃, the molding film shrinks toward the buoy to be in close contact with the buoy.

Hereinafter, the present invention will be described with reference to Examples.

Example 1

형상으로 40~120 ℃에서 진공성형하여(도1B 참조), 진공성형된 두 개의 성형필름을 제조한 다음, A plurality of upper and lower mold vacuum suction pipes formed on the upper and lower molds 50 and 60 while lowering the upper mold 50 to the lower mold 60 with the polypropylene film 1 interposed therebetween as shown in FIG. 1A. At 51 and 61, the film is vacuumed by a vacuum pipe connected to a vacuum pump (not shown).

Vacuum molding at a shape of 40 ~ 120 ℃ (see Figure 1B), to prepare a vacuum molded two molded film,

 After placing the molded film vacuum-formed to the buoy forming lower mold 65 with the lower mold micro-projection 65-1 in the upper center so that no bubbles are generated in the buoy,

  Lowering the projection-forming upper mold 55 with the upper mold micro-projection 55-1 at the lower center to the projection-forming lower mold 65, the lower part of the molding film placed in the projection-forming lower mold 65 After the hole is formed, the molded film is not broken during operation (the larger the number of holes, the less bubbles are generated), and after the hole is formed in the molded film 1-1 (see Fig. 1C),

After the edges of the two molded films (1-1), which are formed with fine holes as described above, are asymmetrically contacted (see FIG. 1D), and then embedded therein the buoy 2 molded with polypropylene foam therein, Put the mold into the mold (not shown), and put the mold into the oven and heated to 100 ~ 220 ℃ (see Fig. 1E), the air is injected at a pressure of 0.5 ~ 2kgf / ㎠ with a compressor, the molding film is directed to the buoy By shrinking and heat-sealing the buoy to prepare an eco-friendly buoy (see Figure 1G).

Example 2

형상으로 40~120 ℃에서 진공성형하여(도1B 참조), 진공성형된 두 개의 성형필름을 제조한 다음, A plurality of upper and lower mold vacuum suction pipes formed on the upper and lower molds 50 and 60 while lowering the upper mold 50 to the lower mold 60 with the polypropylene film 1 interposed therebetween as shown in FIG. 1A. At 51 and 61, the film is vacuumed by a vacuum pipe connected to a vacuum pump (not shown).

Vacuum molding at a shape of 40 ~ 120 ℃ (see Figure 1B), to prepare a vacuum molded two molded film,

 After placing the molded film vacuum-formed to the buoy forming lower mold 65 with the lower mold micro-projection 65-1 in the upper center so that no bubbles are generated in the buoy,

  Lowering the projection-forming upper mold 55 with the upper mold micro-projection 55-1 at the lower center to the projection-forming lower mold 65, the lower part of the molding film placed in the projection-forming lower mold 65 After the hole is formed, the molded film is not broken during operation (the larger the number of holes, the less bubbles are generated), and after the hole is formed in the molded film 1-1 (see Fig. 1C),

After the edges of the two molded films (1-1), which are formed with fine holes as described above, are asymmetrically contacted (see FIG. 1D), and then embedded therein the buoy 2 molded with polypropylene foam therein, Put the mold in a mold (not shown), first heat the side border to a temperature of 100 ~ 180 ℃ to heat-sealed the edge (see Figure 1F), then put the mold in the oven with the edge attached 100 ~ 220 ℃ By heating with a molded film shrink to the buoy to heat-sealed to the buoy to prepare an eco-friendly buoy (see Figure 1G).

 Example 3

형상의 성형필름으로 40~180 ℃에서 사출성형한 다음, 부표에 기포가 발생하지 않도록 사출성형된 성형필름을 중앙상부에 하부금형미세돌기(65-1)가 구비된 돌기성형하부금형(65)에 위치시킨 후에,By using the injection machine 2A

After the injection molding at 40 ~ 180 ℃ with a shaped film of the shape, the projection molding lower mold (65) is provided with a lower mold micro-projection (65-1) in the upper center of the injection molded molded film so as not to generate bubbles in buoys After located in

  Lowering the projection-forming upper mold 55 with the upper mold micro-projection 55-1 at the lower center to the projection-forming lower mold 65, the lower portion of the formed film placed in the projection-forming lower mold 65

 After forming a small hole so that the molded film is not broken during the operation (the more the number of holes, the less bubbles are generated) after manufacturing the molded film 100 formed with holes (see Fig. 2C),

After the edges of the two molded films 100 having fine holes formed as described above are symmetrically contacted (see FIG. 2D), the buoy 2 formed of polypropylene foam is embedded therein, and then (Not shown), the mold was placed in an oven and heated to 100-220 ° C. (see Fig. 2E), and the air was injected at a pressure of 0.5-2 kgf / cm 2 with a compressor, and the molded film contracted toward the buoy. Heat-sealing the buoy to prepare an eco-friendly buoy (see Figure 2G).

Example 4

형상의 성형필름으로 40~180 ℃에서 사출성형한 다음, 부표에 기포가 발생하지 않도록 사출성형된 성형필름을 중앙상부에 하부금형미세돌기(65-1)가 구비된 돌기성형하부금형(65)에 위치시킨 후에,By using the injection machine 2A

After the injection molding at 40 ~ 180 ℃ with a shaped film of the shape, the projection molding lower mold (65) is provided with a lower mold micro-projection (65-1) in the upper center of the injection molded molded film so as not to generate bubbles in buoys After located in

  Lowering the projection-forming upper mold 55 with the upper mold micro-projection 55-1 at the lower center to the projection-forming lower mold 65, the lower portion of the formed film placed in the projection-forming lower mold 65

 After forming a small hole so that the molded film is not broken during work (the more the number of holes, the less bubbles are generated) after manufacturing the formed film 100 formed holes (see Fig. 2C),

After the edges of the two molded films 100 having fine holes formed as described above are symmetrically contacted (see FIG. 2D), the buoy 2 formed of polypropylene foam is embedded therein, and then (Not shown), but first, the side border is heated to a temperature of 100 ~ 180 ℃ to heat-sealed the rim (see Figure 2F), and then put the mold in the oven attached to the mold to heat to 100 ~ 220 ℃ Then, the molded film was shrunk toward the buoy, and thermally fused to the buoy to prepare an eco-friendly buoy (see FIG. 2G).

Experimental Example

  Experimental results of the physical properties of the buoy prepared by Example 1 of the present invention were obtained as follows.

Physical properties Unit Test Grade 13.5 X 15.X 18.X 30.X 40.X 45.X Beads Bulk Density
(Apparent density) g / L - 56 50 43 26.5 20.5 17 Molded Density
(Molding density) g / L - 66.7 60.0 50.0 30.0 22.5 20.0 Tensile Strength
( The tensile strength ) kgf / cm Thickness: 101 mm
50 mm / min 10.00 9.00 7.00 4.59 3.44 3.08 Etongation Break
( Elongation ) % Thickness: 101 mm
50 mm / min 10 12 15 20 23 25 Compressive Strength
(Compressive strength) kgf / cm 20%
303030 mm, 50mm / min 5.00 4.00 3.00 1.73 1.12 1.00 50%
303030 mm, 50mm / min 6.00 5.00 4.00 2.06 1.60 1.49 Heat Sag
( Thermohydration ) mm 340g, 80, Jh One 2.5 4 7 8 9 Burning Begavior
(combustibility) mm / min 23,24h 40 45 50 70 - - 80,168h 37 40 55 75 - - Dimension Stability
(contractility) % 5050mm, 100,22h - 0.39% - 0.64% - 0.98%

Sample name: EPP aquaculture rich (60L) Test result Test Items unit Sample classification Results Test Methods Appearance - - clear Quality Assurance Inspection Standard (QM-3808-01) Dimensions (length) mm - 520 Quality Assurance Inspection Standard (QM-3808-01) Dimensions (diameter) mm - 364 Quality Assurance Inspection Standard (QM-3808-01) weight g - 1272.0 Quality Assurance Inspection Standard (QM-3808-01) density kg / m - 24 Quality Assurance Inspection Standard (QM-3808-01) Absorption g / 100cm - 0.3 Quality Assurance Inspection Standard (QM-3808-01) Compressive strength N / cm - 9.1 Quality Assurance Inspection Standard (QM-3808-01) FUR test N - 518 Quality Assurance Inspection Standard (QM-3808-01)

Buoy prepared by Example 2 of the present invention; EPP aquaculture rich (100L) Test result Test Items unit Sample classification Results Test Methods Appearance - - clear Quality Assurance Inspection Standard (QM-3808-01) Dimensions (length) mm - 610 Quality Assurance Inspection Standard (QM-3808-01) Dimensions (diameter) mm - 431 Quality Assurance Inspection Standard (QM-3808-01) weight g - 2220.7 Quality Assurance Inspection Standard (QM-3808-01) density kg / m - 26 Quality Assurance Inspection Standard (QM-3808-01) Absorption g / 100cm - 0.3 Quality Assurance Inspection Standard (QM-3808-01) Compressive strength N / cm - 9.3 Quality Assurance Inspection Standard (QM-3808-01) FUR test N - 856 Quality Assurance Inspection Standard (QM-3808-01)

Reception number: D215-11-00084

                                                      Page No.: 2 OF 2

 Experiment of Buoy Prepared by Example 1 of the Present Invention ingredient content Test Methods Detection limit Cadmium (Cd) Not detected USEPA 30508 1 mg / kg Lead (Pb) Not detected USEPA 3052 Mercury (Hg) Not detected USEPA 3052 Chrome VI (Cr VI) Not detected USEPA 3060A

Note) After decomposing acid / alkali by the test method for each item for the above element specified in NES M 0301

Measured by ICP-OES and UV-VIS SPECTROMETER.

 Experiment of buoy prepared by Example 1 of the present invention EPP EPS Item unit 15 times 30 times 18-33 times density g / l 60 30 30-55 7 tear strength kg / 5.7 2.2 Compressive strength kg / 2.6 1.3  1.8 Buoyancy g / l 950 970 absorptivity g / 100 0.33 0.35  0.5 Thermal conductivity kcal / nhc (0) 0.035
kcal / nhc (20) 0.036 0.031
(At least 30 weights)

  Buoy prepared by Example 1 of the present invention Item Compressive strength Breakage flexibility Non-pharmaceutical Heat resistance Dynamic buffer
(Primary) Dynamic buffer
(repeat) EPP Good Good Good Very good Very good Good Very good EPS Very good Bad Blank usually usually Good Bad EPE usually Good Very good usually usually Good Very good

Film (1), molded film (1-1, 100), buoy (2), upper mold (50), upper and lower mold vacuum suction pipes (51, 61). Protrusion molding upper mold (55), upper and lower mold micro-projections (55-1, 65-1), lower mold (60), protrusion molding lower mold (65),

Claims (3)

In the manufacturing method of an eco-friendly buoy,
A plurality of upper mold vacuum suction pipes 51 formed on the upper mold 50 while lowering the upper mold 50 to the lower mold 60 with the polypropylene film 1 interposed therebetween, and the lower mold ( The film is vacuumed by a vacuum pipe connected to a vacuum pump in a plurality of lower mold vacuum suction pipes 61 formed in the chamber 60) .

Vacuum molding at a shape of 40 ~ 120 ℃, to produce a vacuum molded two molded film,
After placing the molded film vacuum-formed to the buoy forming lower mold 65 with the lower mold micro-projection 65-1 in the upper center so that no bubbles are generated in the buoy,
Lowering the projection-forming upper mold 55 with the upper mold micro-projection 55-1 at the lower center to the projection-forming lower mold 65, the lower part of the molding film placed in the projection-forming lower mold 65 After punching a hole so that the molded film is not broken during work, and manufactured on the molded film 1-1 with holes,
As described above, the edges of the two molded films 1-1 having the fine holes formed thereon are symmetrically contacted with each other, and thereafter, the buoy 2 formed of polypropylene foam is embedded therein, and then placed in a mold. The mold is placed in an oven and heated to 100 to 220 ° C. while injecting air at a pressure of 0.5 to 2 kgf / cm 2 into the compressor, and the molding film 1-1 shrinks toward the buoy to be manufactured by heat fusion to the buoy. Eco-friendly buoy manufacturing method characterized in that. In the manufacturing method of an eco-friendly buoy,
A plurality of upper mold vacuum suction pipes 51 formed on the upper mold 50 while lowering the upper mold 50 to the lower mold 60 with the polypropylene film 1 interposed therebetween, and the lower mold ( The film is vacuumed by a vacuum pipe connected to a vacuum pump in a plurality of lower mold vacuum suction pipes 61 formed in the chamber 60) .

Vacuum molding at a shape of 40 ~ 120 ℃, to produce a vacuum molded two molded film,
After placing the molded film vacuum-formed to the buoy forming lower mold 65 with the lower mold micro-projection 65-1 in the upper center so that no bubbles are generated in the buoy,
Lowering the projection-forming upper mold 55 with the upper mold micro-projection 55-1 at the lower center to the projection-forming lower mold 65, the lower part of the molding film placed in the projection-forming lower mold 65 After punching a hole so that the molded film is not broken during work, and manufactured on the molded film 1-1 with holes,
As described above, the edges of the two molded films 1-1 having the fine holes formed thereon are symmetrically contacted with each other, and thereafter, the buoy 2 formed of polypropylene foam is embedded therein, and then placed in a mold. First, the side edges are heated to a temperature of 100 to 180 ° C., and the edges are heat-sealed. Then, the mold is placed in an oven while the edges are attached and heated to 100 to 220 ° C. so that the molded film 1-1 shrinks toward the buoy. Eco-friendly buoy manufacturing method characterized in that by manufacturing by heat-sealing buoy. In the manufacturing method of an eco-friendly buoy,
Using an injection machine

After the injection molding at 40 ~ 180 ℃ with a shaped film of the shape, the projection molding lower mold (65) is provided with a lower mold micro-projection (65-1) in the upper center of the injection molded molded film so as not to generate bubbles in buoys After located in
Lowering the projection-forming upper mold 55 with the upper mold micro-projection 55-1 at the lower center to the projection-forming lower mold 65, the lower portion of the formed film placed in the projection-forming lower mold 65
After forming a small hole so that the molded film is not broken during the work, and manufactured in the molded film 100 formed with holes,
After making the edges of the two molded films 100 formed with the fine holes as described above asymmetrically contacted, and then embedded buoy (2) molded into a polypropylene foam therein, put in a mold, the molding The mold is put into an oven and heated to 100 to 220 ° C. while injecting air at a pressure of 0.5 to 2 kgf / cm 2 with a compressor, and the molding film 100 shrinks toward the buoy to be manufactured by heat fusion to the buoy. Method of making buoys.

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