JPH06217662A - Production of float coated with heat-shrinkable film - Google Patents
Production of float coated with heat-shrinkable filmInfo
- Publication number
- JPH06217662A JPH06217662A JP5034768A JP3476893A JPH06217662A JP H06217662 A JPH06217662 A JP H06217662A JP 5034768 A JP5034768 A JP 5034768A JP 3476893 A JP3476893 A JP 3476893A JP H06217662 A JPH06217662 A JP H06217662A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- synthetic resin
- shrinkable film
- foamed synthetic
- float
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229920006257 Heat-shrinkable film Polymers 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 42
- 239000000057 synthetic resin Substances 0.000 claims abstract description 42
- 238000005187 foaming Methods 0.000 claims abstract description 8
- 238000000465 moulding Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 2
- 229920006248 expandable polystyrene Polymers 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 239000011347 resin Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- 239000004794 expanded polystyrene Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 5
- -1 polyethylene Polymers 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
- 244000144974 aquaculture Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Classifications
-
- 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
Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
- Farming Of Fish And Shellfish (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は熱収縮性フィルムで密着
被覆した、耐久性に優れ、特に漁業用として好適なフロ
ートの製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a float which is closely coated with a heat-shrinkable film and which has excellent durability and is particularly suitable for fisheries.
【０００２】[0002]
【従来の技術】発泡ポリスチレンを代表とする発泡合成
樹脂成形体は体積当たりの重量が軽く、任意の形状に成
形できることからあらゆる分野で使用されており、係留
用又は漁業用のフロートとしてもかなり大量に使用され
ている。これらのフロートとしては太鼓形や球形に成形
した発泡合成樹脂成形体を合成樹脂製のカバーシートで
覆ったものが通常使用されている。2. Description of the Related Art Foamed synthetic resin moldings typified by expanded polystyrene are used in all fields because they have a light weight per volume and can be molded into any shape, and are used in a large amount as mooring or fishing floats. Is used for. As these floats, those obtained by covering a foamed synthetic resin molded body formed in a drum shape or a spherical shape with a cover sheet made of synthetic resin are usually used.
【０００３】しかしながら、これらのフロートの場合に
は、合成樹脂製のカバーシートで発泡合成樹脂成形体を
単に覆うだけであるため、カバーシートと該発泡成形体
との隙間から水が入りやすく、長期間のうちに水が発泡
合成樹脂成形体中に浸透して浮力が低下して、場合によ
っては沈没してしまったり、表面に凹凸が多いため水中
抵抗が高くなったり、「かき」などの水中生物が付着し
て重量や水中抵抗が増加するなどの問題があった。However, in the case of these floats, since the foam synthetic resin molding is simply covered with the cover sheet made of synthetic resin, water easily enters through the gap between the cover sheet and the foam molding, and During the period, the water penetrates into the foamed synthetic resin molded product and the buoyancy decreases, and in some cases it sinks, or there are many irregularities on the surface, resulting in high underwater resistance. There was a problem that organisms adhered and weight and underwater resistance increased.
【０００４】このような問題を解決したものとして、フ
ロートを熱収縮性フィルムで被覆後加熱して収縮せしめ
て熱収縮性フィルムで密着被覆したフロートが特開平３
−２５８６８７号公報などに提案されている。このフロ
ートは発泡合成樹脂成形体と被覆フィルムとが密着して
いるので水の浸透が防げるとともに表面が滑らかに仕上
がるとういう利点を有している。しかしながら、発泡合
成樹脂成形体の表面にはかなり凹凸があるので、熱収縮
性フィルムを加熱収縮させて形状に合わせた被覆をして
も、まだ密着が不十分であった。また、発泡合成樹脂成
形体の一部を被覆した場合には効果を十分に発揮するこ
とができず、全面を密封被覆しようとすると熱収縮性フ
ィルムを加熱して収縮させる際の熱で、該発泡合成樹脂
成形体からガスが発生し熱収縮性フィルムと発泡合成樹
脂成形体の間にガス溜りができて結局、密着した被覆が
できないという問題があった。As a solution to such a problem, there is a float in which a float is coated with a heat-shrinkable film, heated and shrunk, and closely coated with a heat-shrinkable film.
No. 258687 is proposed. This float has the advantages that the foamed synthetic resin molding and the covering film are in close contact with each other, so that water permeation can be prevented and the surface can be finished smoothly. However, since the surface of the foamed synthetic resin molded product is considerably uneven, even if the heat-shrinkable film is heat-shrinked to be coated according to the shape, the adhesion is still insufficient. In addition, when a part of the foamed synthetic resin molded body is covered, the effect cannot be sufficiently exerted, and when the entire surface is hermetically covered, the heat generated when the heat-shrinkable film is heated to shrink the There has been a problem that gas is generated from the foamed synthetic resin molded body and a gas pool is formed between the heat-shrinkable film and the foamed synthetic resin molded body, so that a tight coating cannot be obtained.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上述した問
題点のない、長期にわたって使用可能で、しかも表面が
平滑で水中抵抗が少なく、また海中生物の付着も少ない
熱収縮性フィルムで密着被覆したフロートの改良された
製造方法を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention is adherently coated with a heat-shrinkable film which does not have the above-mentioned problems, can be used for a long period of time, has a smooth surface, has little resistance to water, and has little adhesion of marine organisms. It is an object of the present invention to provide an improved method for producing the float.
【０００６】[0006]
【課題を解決するための手段】本発明によれば、発泡合
成樹脂成形体を二次発泡温度以上に加熱処理した後、チ
ューブ状及び／又は一方が開口している袋状の熱収縮性
フィルムをかぶせ、加熱収縮させて該発泡合成樹脂成形
体を被覆することを特徴とする熱収縮性フィルムで被覆
されたフロートの製造方法が提供され、さらに、前記発
泡合成樹脂成形体が発泡ポリスチレンであることを特徴
とする前記熱収縮性フィルムで被覆されたフロートの製
造方法が提供され、さらにまた、前記の熱収縮性フィル
ムを複数枚用いて発泡合成樹脂成形体の全面を密封被覆
することを特徴とする前記熱収縮性フィルムで被覆され
たフロートの製造方法が提供される。According to the present invention, a heat-shrinkable film in the form of a tube and / or a bag having one opening is formed after heat-treating a foamed synthetic resin molded article at a temperature higher than the secondary foaming temperature. A method for producing a float covered with a heat-shrinkable film is provided, which comprises covering the foamed synthetic resin molded body by heating and shrinking the foamed synthetic resin molded body, and the foamed synthetic resin molded body is expanded polystyrene. A method for producing a float covered with the heat-shrinkable film is provided, and further, the whole surface of the foamed synthetic resin molded body is hermetically covered by using a plurality of the heat-shrinkable films. A method for producing a float coated with the heat-shrinkable film is provided.
【０００７】すなわち、発泡合成樹脂成形体を前もって
二次発泡温度以上に加熱処理しておくと、再加熱時のガ
ス発生を減少させることができ、その際に表面が溶融し
て平滑となるので、発泡合成樹脂成形体自体の耐水性や
強度も向上するので、加熱処理した発泡合成樹脂成形体
に熱収縮性フィルムをかぶせ、加熱収縮させると密着し
た被覆が可能となり、得られたフロートの長寿命化、高
強度化、低水中抵抗化がはかれることを見いだし本発明
に到達した。That is, if the foamed synthetic resin molded body is previously heat-treated at a temperature not lower than the secondary foaming temperature, gas generation at the time of reheating can be reduced, and at that time, the surface melts and becomes smooth. Since the water resistance and strength of the foamed synthetic resin molding itself are improved, covering the heat-treated foamed synthetic resin molding with a heat-shrinkable film and heat-shrinking makes it possible to obtain a tightly adherent coating. The present invention has been achieved by finding that the life, the strength, and the resistance to water are reduced.
【０００８】本発明に使用する発泡合成樹脂成形体はガ
スの圧力を利用して発泡させて得られたものであれば特
に制限なく使用でき、例えば、ポリスチレン、ポリエチ
レン、ポリプロピレンの発泡成形体などが挙げられる。
その中でも、従来からフロートとして多用されている発
泡ポリスチレンが特に好ましく使用される。また、発泡
合成樹脂成形体の形状についても特に制限はないが通
常、円柱形、球形のものが多用される。The foamed synthetic resin molding used in the present invention can be used without particular limitation as long as it is obtained by foaming by utilizing gas pressure, and examples thereof include polystyrene, polyethylene and polypropylene foamed moldings. Can be mentioned.
Among them, expanded polystyrene, which has been widely used as a float, is particularly preferably used. Further, the shape of the foamed synthetic resin molded body is not particularly limited, but generally, a cylindrical shape or a spherical shape is often used.
【０００９】チューブ状及び／又は一方が開口している
袋状の熱収縮性フィルムとはポリエチレン、ポリプロピ
レンなどのポリオレフィン系樹脂で代表される熱可塑性
樹脂を通常の方法で製膜して得られる熱収縮性を付与し
たフィルムをチューブ状や一方が開口している袋状に加
工したものを意味する。製膜方法としては、インフレー
ション押出成形法、Ｔダイ押出成形法などが挙げられる
が、インフレーション押出成形法で製膜した場合にはチ
ューブ状に加工するには両端をカットするだけでよく、
袋状に加工するにはチューブの一方を熱融着させるだけ
ですむので、継ぎ目に基因する表面の凹凸が少なくなる
ので好ましい。特に、前記チューブの一方の先端部だけ
を熱収縮させてフランジ部を形成し、そこに底部用の円
形フィルムを熱融着して形成した丸底円筒状袋を用いる
とシール強度が高く、表面も平滑に仕上がるので好まし
い。The tube-shaped and / or bag-shaped heat-shrinkable film having one opening is a heat obtained by forming a thermoplastic resin represented by polyolefin resin such as polyethylene or polypropylene by a usual method. It means that a film having shrinkage properties is processed into a tube shape or a bag shape with one side opened. Examples of the film forming method include an inflation extrusion molding method and a T-die extrusion molding method. When the film is formed by the inflation extrusion molding method, it is sufficient to cut both ends to process it into a tube.
Since it is only necessary to heat-bond one of the tubes to form a bag, it is preferable because the surface irregularities due to the seams are reduced. In particular, when a round-bottomed cylindrical bag formed by heat-shrinking only one end of the tube to form a flange portion and heat-sealing a circular film for the bottom therein is used, the sealing strength is high and the surface is Is also preferable because it is finished smoothly.
【００１０】本発明で使用する熱収縮性フィルムの収縮
率は製膜時の延伸倍率によって調節されるが、発泡合成
樹脂成形体に密着させ、かつ表面が平滑で仕上がりをき
れいにする必要があるので、縦・横方向ともに３０％以
上有していることが好ましく、横方向の収縮率が縦方向
の収縮率よりも幾分大きい方が特に好ましい。The shrinkage rate of the heat-shrinkable film used in the present invention is adjusted by the draw ratio during film formation, but it is necessary to make it adhere to the foamed synthetic resin molded article and to make the surface smooth and clean the finish. It is preferable to have 30% or more in both the vertical and horizontal directions, and it is particularly preferable that the shrinkage in the horizontal direction is somewhat larger than that in the vertical direction.
【００１１】以下に本発明の製造方法を手順に沿って説
明する。まず、フロートの形状をした発泡合成樹脂成形
体を加熱炉中で二次発泡温度以上に加熱処理する。発泡
ポリスチレンの場合は通常８０〜１００℃で加熱成形さ
れており、１００℃以上に達すると二次発泡が起こり内
部のガスが放出される。したがって、通常雰囲気温度が
１５０〜１８０℃程度の加熱炉で１０分未満の短時間加
熱処理するのが好ましく、このとき、発泡合成樹脂成形
体の表面側の一部が溶融して緻密で平滑な表面が形成さ
れるのである。これらの条件は発泡合成樹脂成形体の種
類によっても異なるが二次発泡温度以上で加熱処理する
ことが必要である。The manufacturing method of the present invention will be described below in accordance with the procedure. First, a foamed synthetic resin molded body in the shape of a float is heated in a heating furnace to a temperature higher than the secondary foaming temperature. In the case of expanded polystyrene, it is usually heat-molded at 80 to 100 ° C, and when it reaches 100 ° C or higher, secondary foaming occurs and the gas inside is released. Therefore, it is preferable to perform heat treatment for a short time of less than 10 minutes in a heating furnace having a normal atmosphere temperature of about 150 to 180 ° C., and at this time, a part of the surface side of the foamed synthetic resin molded body is melted to be dense and smooth. The surface is formed. These conditions differ depending on the type of the foamed synthetic resin molded product, but it is necessary to perform heat treatment at a secondary foaming temperature or higher.
【００１２】次いで、加熱処理した発泡合成樹脂成形体
１に上述した熱収縮性フィルム２をかぶせてから加熱収
縮させる。例えば、発泡合成樹脂成形体１が円柱状の場
合は、（１）２枚の一方が開口した袋状の熱収縮性フィ
ルム２を発泡合成樹脂成形体１の両端部側からかぶせて
中央部でオーバーラップさせ、加熱収縮させると同時に
オーバーラップ部２１を熱融着させて、密封被覆する方
法（図１参照）、（２）チューブ状の熱収縮性フィルム
２に発泡合成樹脂成形体１を通した後、加熱収縮させて
密封被覆する方法（図２参照）、（３）（１）の方法で
被覆した後、（２）の方法で再度被覆する方法、（４）
（２）の方法で中央部を被覆した後、（１）の方法で全
面を密封被覆する方法などが挙げられる。また、発泡合
成樹脂成形体１が球形の場合もほぼ同様な方法で被覆で
きる。Then, the heat-shrinkable film 2 described above is covered on the heat-treated foamed synthetic resin molding 1 and then heat-shrinked. For example, in the case where the foamed synthetic resin molded body 1 has a columnar shape, (1) the bag-shaped heat-shrinkable film 2 having one of the two opened is covered from both end sides of the foamed synthetic resin molded body 1 and the A method of overlapping and heat-shrinking, and at the same time heat-sealing the overlap portion 21 and sealingly covering it (see FIG. 1), (2) passing the foamed synthetic resin molded body 1 through the tubular heat-shrinkable film 2. After that, heat shrinking is performed to perform sealing coating (see FIG. 2), (3) Coating is performed by the method (1), and coating is performed again by the method (2), (4)
Examples include a method in which the central portion is covered by the method (2) and then the entire surface is hermetically covered by the method (1). Further, when the foamed synthetic resin molded body 1 has a spherical shape, it can be covered by substantially the same method.
【００１３】[0013]
【作用及び効果】本発明においては、発泡合成樹脂成形
体を事前に加熱処理するので、加熱収縮時のガスの発生
量を少なくすることができ、特に、密封被覆の場合にガ
ス溜りが生じるのを防止することができる。また、その
際に発泡合成樹脂成形体の表面が溶融して平滑になるの
で密着被覆が可能となり、水の進入や、破損、水中抵抗
の増加を押さえることができるとともに発泡合成樹脂成
形体自身も耐水性と強度アップをはかることができると
いう利点を有している。In the present invention, since the foamed synthetic resin molding is heat-treated in advance, it is possible to reduce the amount of gas generated at the time of heat shrinkage. Can be prevented. Further, at that time, since the surface of the foamed synthetic resin molded body is melted and becomes smooth, it is possible to carry out adhesion coating, and it is possible to suppress entry of water, damage, and increase in underwater resistance, and also the foamed synthetic resin molded body itself. It has the advantage of being able to improve water resistance and strength.
【００１４】さらに、ポリオレフィン系樹脂からなる熱
収縮性フィルムは一般に表面張力が高く水をはじきやす
い上に、表面の平滑性もよいので、海中生物の付着を大
幅に減少させる効果（従来のカバーシートの場合に比べ
て１／３〜１／４に減少）があり、また仮に付着しても
容易に取り除くことができるという利点を有している。Further, since a heat-shrinkable film made of a polyolefin resin generally has a high surface tension and easily repels water, and has a good surface smoothness, it has an effect of greatly reducing the adhesion of marine organisms (conventional cover sheet). 1) to 1/4 compared with the case of 1) and has an advantage that it can be easily removed even if it is attached.
【００１５】したがって、得られたフロートは長期間使
用しても浸水や海中生物の付着による浮力の低下や破損
が少なく、しかも、水中抵抗も少ないので養殖漁業、そ
の他の分野に大きく貢献するものと考えられる。Therefore, even if the obtained float is used for a long period of time, the buoyancy is not reduced or damaged due to the infiltration of water or marine organisms, and the underwater resistance is also small, which greatly contributes to aquaculture and other fields. Conceivable.
【図１】円柱状の発泡合成樹脂成形体を用いた本発明の
フロートの一例を示す、斜視図（Ａ）、及びそのＸ−
Ｘ’断面図（Ｂ）であるFIG. 1 is a perspective view (A) showing an example of a float of the present invention using a cylindrical foamed synthetic resin molding, and its X-.
It is a X'sectional view (B).
【図２】本発明のフロートの他の一例を示す斜視図であ
る。FIG. 2 is a perspective view showing another example of the float of the present invention.
１ 発泡合成樹脂成形体 ２ 熱収縮性フィルム ２１ 熱収縮性フィルムのオーバーラップ部 1 Foamed Synthetic Resin Molded Body 2 Heat Shrinkable Film 21 Overlap Part of Heat Shrinkable Film
Claims (3)
加熱処理した後、チューブ状及び／又は一方が開口して
いる袋状の熱収縮性フィルムをかぶせ、加熱収縮させて
該発泡合成樹脂成形体を被覆することを特徴とする熱収
縮性フィルムで被覆されたフロートの製造方法。1. A foamed synthetic resin molded body is heat-treated at a temperature higher than a secondary foaming temperature and then covered with a tube-shaped and / or bag-shaped heat-shrinkable film having one opening, and heat-shrinked to foam the foamed synthetic resin. A method for producing a float covered with a heat-shrinkable film, which comprises coating a resin molding.
ンであることを特徴とする請求項１記載の熱収縮性フィ
ルムで被覆されたフロートの製造方法。2. The method for producing a float covered with a heat-shrinkable film according to claim 1, wherein the foamed synthetic resin molding is foamed polystyrene.
泡合成樹脂成形体の全面を密封被覆することを特徴とす
る請求項１又は請求項２記載の熱収縮性フィルムで被覆
されたフロートの製造方法。3. The float covered with the heat-shrinkable film according to claim 1, wherein the foamed synthetic resin molded body is hermetically covered with a plurality of the heat-shrinkable films. Manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5034768A JP2614393B2 (en) | 1993-01-28 | 1993-01-28 | Method for producing float coated with heat shrinkable film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5034768A JP2614393B2 (en) | 1993-01-28 | 1993-01-28 | Method for producing float coated with heat shrinkable film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06217662A true JPH06217662A (en) | 1994-08-09 |
| JP2614393B2 JP2614393B2 (en) | 1997-05-28 |
Family
ID=12423492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5034768A Expired - Lifetime JP2614393B2 (en) | 1993-01-28 | 1993-01-28 | Method for producing float coated with heat shrinkable film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2614393B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101501696B1 (en) * | 2014-10-01 | 2015-03-17 | 주식회사 제이에스수지 | Buoy for aquaculture and with a gas discharge hole in a method of manufacturing the same |
| KR101600525B1 (en) * | 2015-10-20 | 2016-03-07 | (주) 태광 | As a method of forming a green buoy wrapped Styrofoam buoys |
| CN105636863A (en) * | 2014-09-24 | 2016-06-01 | 株式会社新明 | Eco-friendly buoy |
| JP2018014992A (en) * | 2016-07-25 | 2018-02-01 | コリア インスティチュート オブ オーシャン サイエンス アンド テクノロジー | Buoyancy device having multi-layer of air |
| KR101853315B1 (en) * | 2017-10-13 | 2018-04-30 | 제우피엔씨 주식회사 | ocean buoy using heat shrinkable synthetic resin absence and method of making the buoy |
| CN108391631A (en) * | 2018-04-27 | 2018-08-14 | 姚利 | A kind of explosion-proof shatter-resistant buoy and its preparation process |
-
1993
- 1993-01-28 JP JP5034768A patent/JP2614393B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105636863A (en) * | 2014-09-24 | 2016-06-01 | 株式会社新明 | Eco-friendly buoy |
| KR101501696B1 (en) * | 2014-10-01 | 2015-03-17 | 주식회사 제이에스수지 | Buoy for aquaculture and with a gas discharge hole in a method of manufacturing the same |
| KR101600525B1 (en) * | 2015-10-20 | 2016-03-07 | (주) 태광 | As a method of forming a green buoy wrapped Styrofoam buoys |
| JP2018014992A (en) * | 2016-07-25 | 2018-02-01 | コリア インスティチュート オブ オーシャン サイエンス アンド テクノロジー | Buoyancy device having multi-layer of air |
| CN107646767A (en) * | 2016-07-25 | 2018-02-02 | 韩国海洋科学技术院 | Buoyant device with multi-layer air structure |
| KR101853315B1 (en) * | 2017-10-13 | 2018-04-30 | 제우피엔씨 주식회사 | ocean buoy using heat shrinkable synthetic resin absence and method of making the buoy |
| CN108391631A (en) * | 2018-04-27 | 2018-08-14 | 姚利 | A kind of explosion-proof shatter-resistant buoy and its preparation process |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2614393B2 (en) | 1997-05-28 |
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