JPS59142119A - Manufacture of baglike sheet used as fender or the like - Google Patents
Manufacture of baglike sheet used as fender or the likeInfo
- Publication number
- JPS59142119A JPS59142119A JP58015963A JP1596383A JPS59142119A JP S59142119 A JPS59142119 A JP S59142119A JP 58015963 A JP58015963 A JP 58015963A JP 1596383 A JP1596383 A JP 1596383A JP S59142119 A JPS59142119 A JP S59142119A
- Authority
- JP
- Japan
- Prior art keywords
- bag
- baglike
- foam
- sheet
- particles
- 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
Classifications
-
- 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
- B29C44/3426—Heating by introducing steam in the mould
-
- 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
- B29C44/18—Filling preformed cavities
- B29C44/181—Filling unsupported soft shells having a particular 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
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/44—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form
- B29C44/445—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form in the form of expandable granules, particles or beads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は防舷材等に用いる袋状シートの製造方法に関
し、更に詳述すれば軽量にて耐久性に優れた袋状シート
、特に防舷材、フロート等に好適な袋状シートの製造方
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a bag-like sheet used for fenders, etc., and more specifically, a bag-like sheet that is lightweight and has excellent durability, particularly suitable for fenders, floats, etc. The present invention relates to a method for manufacturing a bag-like sheet.
従来、船舶の防舷材を製造する方法としては、合成ゴム
を用いて形成する方法が普及しているが、この方法によ
って製造された防舷材は、重量が重くて運搬等の取扱ひ
が不便であるほか、価格も高価である等の欠点を有して
いた０このために前記方法に代え、発泡体を芯材とし、
ＦＲＰ（繊維強化プラスチック）等の樹脂をコーティン
グする方法、また合成繊維を表面に貼着して一体化する
方法を用いることが試みられているＯしかし、いずれの
製造方法も極めて類型であるのみならず、その方法によ
って製造された防舷材は、いずれも油付着、衝撃等に起
因して樹脂、合成繊維等が剥離し易くて耐久性が劣ると
いう欠点を有していた。Traditionally, a method of manufacturing ship fenders using synthetic rubber has been popular, but the fenders manufactured by this method are heavy and difficult to handle, such as transporting. In addition to being inconvenient, it also had drawbacks such as being expensive. Therefore, instead of the above method, a method using foam as a core material,
Attempts have been made to coat resins such as FRP (fiber-reinforced plastic), or to integrate synthetic fibers by pasting them onto the surface. However, all of these manufacturing methods are very similar. First, fenders manufactured by this method all had the disadvantage that resins, synthetic fibers, etc. were easily peeled off due to oil adhesion, impact, etc., and their durability was poor.
この発明は、防舷材に用いる袋状シートを製造する従来
方法の上述したような欠点を解消するためになされたも
のであり、軽量にて耐久性に優れた袋状シート、特に防
舷材、フロート等に好適な袋状シートの製造方法を提供
することを目的とするＯ
そしてこの発１ｑＫ係る防舷材′４Ｉに用いる袋状シー
トの製造方法（以下この発明方法という。）は、二層の
織地又は絹地の相互間を、その離隔距離を規制して間隙
を規制すべく連結糸にて要所連結してキルテイング状の
袋状体となし、該袋状体の間：隙内に熱可ゆ性の発泡樹
脂粒子を充填し、該発泡樹脂粒子を蒸気にて加熱するこ
とによって熱膨張させて発泡体となし、該発泡体にて前
記キルテイング状の袋状体内を充実させることを特徴と
している。This invention was made in order to eliminate the above-mentioned drawbacks of the conventional method of manufacturing bag-like sheets used for fender materials, and it is a lightweight and highly durable bag-like sheet, especially for fender materials. The purpose of this invention is to provide a method for manufacturing a bag-like sheet suitable for floats, etc.The method for manufacturing a bag-like sheet used for fender '4I (hereinafter referred to as the method of this invention) according to this invention is as follows: The layers of woven fabric or silk fabric are connected at key points with connecting threads to regulate the separation distance and the gap to form a quilted bag-like body, and between the bag-like bodies: within the gap. Filling with thermoplastic foamed resin particles, heating the foamed resin particles with steam to thermally expand them into a foam, and filling the interior of the quilted bag with the foam. It is a feature.
以下、この発明方法によって８１図に示すような防舷材
等に用いる袋状シート（１）を製造する場合についてそ
の製造過程を示す図面に基づいて詳述する。Hereinafter, the case of manufacturing a bag-shaped sheet (1) for use in fenders, etc. as shown in FIG. 81 by the method of the present invention will be described in detail based on drawings showing the manufacturing process.
第２図はこの発明に係る袋状体の間隙内に熱可塑性の発
泡樹脂粒子を充填した状態を示す模式的断面図、第３図
は前記発泡樹脂粒子を熱膨張させて発泡体上なす過程を
示す模式的断面図である。FIG. 2 is a schematic cross-sectional view showing the state in which thermoplastic foamed resin particles are filled into the gaps of the bag-like body according to the present invention, and FIG. 3 is a process in which the foamed resin particles are thermally expanded and formed on the foamed body. FIG.
（１０１は連結糸■にて要所連結された合成繊維等の織
地又は絹地からなる略直方体形状の袋状体であって、そ
の織地の織目又は絹地の編目は、後述する発泡樹脂粒子
（ｂ）を通過させない一方、蒸気を通過させる程度の粗
度に織成又は編成されている。(101 is a substantially rectangular parallelepiped-shaped bag made of woven fabric or silk fabric such as synthetic fibers connected at key points by connecting threads ①, and the weave of the woven fabric or the stitches of silk fabric are formed by foamed resin particles (described later). b) It is woven or knitted so coarsely that it does not allow water to pass through, but allows steam to pass through.
即ち、袋状体（１Ｇ＋は略長方形状の二層の織地又は絹
地の相互間を、その離隔距離を規制して間隙を形成すべ
く連結糸■にて要所連結してキルテイング状とすると共
に、一部に開口部１１１Ｊを残しつつ周囲４）
を縫合すことにより、略直方体形の袋状となしたもので
ある。In other words, a bag-like body (1G+ is a quilting-like structure in which two approximately rectangular two-layer woven fabrics or silk fabrics are connected at key points with connecting threads ① to regulate the separation distance and form gaps), and By sewing the periphery 4) while leaving an opening 111J in a part, a substantially rectangular parallelepiped bag is formed.
前記連結糸ωさしては、二層の織地を織成する糸若しく
は二層の絹地を編成する糸とは別個の糸、又はその糸よ
りやや太い紐状のものを用い（第４置ずれ等が生じない
ようにした上で、これを前記二層間にて往復させて二層
の織地又は編地の相互間を要所連結することにより、前
記キルテイング状の袋状体（１（［１が形成されている
。。As the connecting thread ω, use a thread that is different from the thread that weaves the two-layer fabric or the thread that knits the two-layer silk fabric, or a string-like thread that is slightly thicker than the thread (if the fourth misalignment etc. The quilted bag-like body (1 ([1 is formed It has been done.
さて、上述した袋状体＋１０１の間隙内には発泡樹脂粒
子（ｂ）を、厳密にいえば発泡性樹脂粒子（商品名：ピ
オセラン（グラフト率：４％）、槓水化成品工業株式会
社製）に発泡剤を加えて発泡させた予備発泡粒子を前記
開口部αυより充填するが１その発泡樹脂粒子（ｂ）の
材料としては、ポリエチレン、ポリプロピレン等のポリ
オレフィン系樹脂を核とし、スチレン系モノマー及びこ
のモノマーを重合させる触媒を前記状に吸収させ、この
棟内にてスチレン系モノマーを重合することＫより、ポ
リオレフィン系樹脂とポリスチレン系樹脂とが少なくと
も一部グラフト結合（グラフト結合部分は、ポリオレフ
ィン系樹脂とポリスチレン系樹脂との総和の１％以上）
したものが用いられる。そしてこの発泡樹脂粒子（ｂ）
は、後述するように袋状体００ごと加熱されることによ
り発泡し、袋状体ｕｅ内にて融着一体化するが、これは
弾力性、復元性、耐油性に優れるものであ、す、特に防
舷材等に用いる袋状シート用として好適である。Now, in the gap of the above-mentioned bag-shaped body +101, there are foamed resin particles (b), strictly speaking, foamed resin particles (trade name: Piocelan (grafting ratio: 4%), manufactured by Kansui Kaseihin Kogyo Co., Ltd. ) is filled with pre-expanded particles foamed by adding a foaming agent to the opening αυ.1 The material of the expanded resin particles (b) is polyolefin resin such as polyethylene or polypropylene, and styrene monomer. The catalyst for polymerizing this monomer is absorbed in the above manner, and the styrene monomer is polymerized within this ridge. By this, the polyolefin resin and the polystyrene resin are at least partially grafted (the grafted portion is 1% or more of the total of polystyrene resin and polystyrene resin)
is used. And this foamed resin particle (b)
As will be described later, the bag-like body 00 is heated and foams, and is fused and integrated within the bag-like body ue, which has excellent elasticity, restorability, and oil resistance. It is particularly suitable for bag-shaped sheets used in fenders and the like.
このように発泡樹脂粒子（ｂ）が充填された袋状体口Ｕ
は、前記開口部ｕ１１が閉じられた後、９ＪＪ３図に示
すように、蒸気か図示しない供給口から供給される蒸気
室（イ）内へ収容される。その袋状体００は前述したよ
うに発泡樹脂粒子（ｂ月ま通過させないが、蒸気を通過
させるので、蒸気は図の矢符にて示すように移動して袋
状体＋１０１内へ侵入し、その蒸気にて発泡樹脂粒子（
ｂ）が加熱膨張されて発泡体■となり、その発泡体（１
０） Ｋよりて前記キルテイング状の袋状体［１０１内
が充実され、第１図に示す袋状シート（１）が製造され
る。The opening U of the bag-like body filled with foamed resin particles (b) in this way
After the opening u11 is closed, as shown in Fig. 9JJ3, the steam is accommodated in a steam chamber (a) into which steam is supplied from a supply port (not shown). As mentioned above, the bag-like body 00 does not allow the foamed resin particles (b) to pass through, but it does allow steam to pass through, so the steam moves as shown by the arrow in the figure and enters the bag-like body +101. The steam causes foamed resin particles (
b) is heated and expanded to form a foam ■, and the foam (1
0) The inside of the quilted bag-like body [101] is filled with K, and the bag-like sheet (1) shown in FIG. 1 is manufactured.
なお、第５図に示すように前記袋状シート０）の両端に
ロープ等によりて輪が形成された止め輪−［株］を設け
ておくと、防舷材として使用するに１祭し、その止め輸
Ｑωを岸壁等圧対する吊着部として用いることにより、
袋状シート（１）の止定を容易且つ迅速に行うことがで
き、至便となる。図中、Ｑ５１１は上記止め輸■［株］
を連結しているロープである。In addition, as shown in FIG. 5, if a retaining ring formed of a rope or the like is provided at both ends of the bag-shaped sheet 0), it will be easier to use it as a fender. By using the suspension Qω as a suspension part against the quay wall with equal pressure,
The bag-shaped sheet (1) can be fixed easily and quickly, which is very convenient. In the diagram, Q511 is the above-mentioned imported stock.
It is a rope that connects the
また前述した実施例においては、連結糸ωとして二層の
織地の織成糸等とは別個の糸又は紐状のものを用いて袋
状体（１０１を形成したが、その連結糸酸系の一部を用
いて袋状体冊を形成してもよい（第６図参照）。In addition, in the above-mentioned embodiment, the bag-like body (101) was formed using a thread or string-like material different from the woven threads of the two-layer fabric as the connecting thread ω. A bag-like booklet may be formed using a portion (see FIG. 6).
更に前記発泡樹脂粒子（ｂ）の材料としては、前述した
ポリオレフィン系樹脂とポリスチレン系樹脂とが少なく
とも一部グラフト結合した樹脂のほか、ボリグロビレン
、ポリスチレン等、他の熱可塑性発泡樹脂粒子を用いる
場合もある。Furthermore, as the material for the foamed resin particles (b), in addition to the aforementioned resin in which at least a portion of the polyolefin resin and polystyrene resin are graft-bonded, other thermoplastic foamed resin particles such as polyglobylene and polystyrene may also be used. be.
上述したように仁の発明方法を用いて製造した袋状シー
ト（１）は、防舷材のほか、オイ・ルフェンス用７０−
ト、浮き桟橋等、種々の用途があり、そ。As mentioned above, the bag-shaped sheet (1) produced using the method invented by Jin can be used not only for fenders but also for oil and fence use.
It has a variety of uses, such as docks and floating piers.
の形状も上述した種々の用途ＫＥ３じて変更して実施す
ることができる。The shape of KE3 can also be changed and implemented according to the various uses mentioned above.
上述したようなこの発明方法によって袋状シートを製造
する場合は、二層の織地又は絹地の相互間を連結糸にて
要所連結してキルテイング状の袋状体となし、該袋状体
内に充填した熱可塑性の発泡樹脂粒子を熱膨張させた発
泡体にて前記袋状体を充実させて袋状シートを製造し、
しかもその発泡体内には連結糸が内在された構造とする
ことができる。上述したようなこの発明方法によれば、
従来のように予め形成した発泡体に対して合成繊維等の
表面材を貼着した後、これに穴をあけて糸又は紐を押通
することによってキルテイング状となす等の焔瑣な工程
を経ることなく、連結糸を発泡体内に押通させた状態に
て内在させ、更にその連結糸にて発泡体上袋状体との構
造を一体化し、発泡体、袋状体及び連結糸の一体性が極
めて強固な袋状シートを製造することができる。このよ
うな袋状シートは発泡体の欠は等を確実に防止すること
ができ、全体的な形状維持効果も優れており、非常に耐
久性も優れているので、特に繰り返して強圧か加わる防
舷材用として好適である。しかもその袋状シートは二層
の織地又は織地による袋状体内を発泡体で充実させたも
のであるので、全体重量が極めて軽く、運搬等の取扱い
が容易であるほか、その製造価格も非常に安価である。When producing a bag-like sheet by the method of the present invention as described above, two layers of woven fabric or silk are connected at key points with connecting threads to form a quilted bag-like body, and the inside of the bag-like body is manufacturing a bag-like sheet by filling the bag-like body with a foam made by thermally expanding filled thermoplastic foam resin particles;
In addition, the foamed material can have a structure in which connecting threads are embedded within the foam. According to the method of this invention as described above,
In the conventional process, a surface material such as synthetic fiber is attached to a pre-formed foam, and then holes are made and threads or strings are pushed through to create a quilted shape. The connecting thread is pushed through the foam and inserted into the foam, and the connecting thread is used to integrate the structure with the upper bag-like body of the foam, thereby making the foam, the bag-like body, and the connecting thread integral. A bag-shaped sheet with extremely strong properties can be produced. This type of bag-shaped sheet can reliably prevent the foam from chipping, etc., has an excellent overall shape-maintaining effect, and is extremely durable, so it can be especially protected against repeated application of strong pressure. Suitable for use as sheath material. Moreover, since the bag-like sheet is made of two layers of woven fabric or a bag made of woven fabric filled with foam, the overall weight is extremely light, making it easy to transport and handle, and the manufacturing cost is also very low. It's cheap.
従ってこの発明は、軽量にて耐久性に優れ、種々の実用
的効果に優れた袋状シート、特に防舷材用の袋状シート
を容易に製造する方法を提供する、極めて優れたもので
ある。Therefore, this invention is extremely excellent in that it provides a method for easily manufacturing a bag-like sheet that is lightweight, has excellent durability, and has excellent various practical effects, especially a bag-like sheet for fender material. .
図はこの発明の実施態様を例示するものであり、第１図
はこの発明に係る袋状シートの代表例の一部欠截斜視図
、第２図及び第８図はこの発明方法の一過程を示す模式
的断面図、第４図は前記袋状シートの要部拡大斜視図、
第５図及び第６図はこの発明に係る袋状シートの変更例
を示す模式的断面図である。
（り・・・袋状シート００１・・・袋状体■・・・連結
糸 田・・・発泡体（ｂ）・・・熱可塑性の発
泡樹脂粒子
第３図
ｂThe drawings illustrate embodiments of the present invention, and FIG. 1 is a partially cutaway perspective view of a typical example of a bag-like sheet according to the invention, and FIGS. 2 and 8 show a process of the method of the invention. FIG. 4 is an enlarged perspective view of the main part of the bag-shaped sheet,
FIGS. 5 and 6 are schematic sectional views showing modified examples of the bag-shaped sheet according to the present invention. (ri...Bag-shaped sheet 001...Bag-shaped body■...Connection thread Field...Foam (b)...Thermoplastic foamed resin particles Fig. 3b
Claims (1)
規制して間隙を形成すべく連結糸にて’ｌｌ所連結して
キルテイング状の袋状体となし、該袋状体の間隙内に熱
可塑□性の発泡樹脂粒子を充填し、該発泡樹脂粒子を蒸
気にて加熱することによって熱膨張させて発泡体となし
、該発泡体にて前記キルテイング状の袋状体内を充実さ
せることを特徴とする防舷材等に用いる袋状シートの製
造方法。 ２、前記袋状体は、その織成糸又は編成糸の一部を連結
糸に用いて形成する上記特許請求の範囲第１項記載の防
舷材等に用いる袋状シートの製造方法。 ８、前記袋状体は、その練成糸若しくは編成糸とは別個
の糸又は紐を連結糸に用いて形成する上記特許請求の範
囲第１項記載の防舷材等に用いる袋状シートの製造方法
。 ４、前記発泡体は、ポリオレフィン系樹脂とポリスチレ
ン系樹脂とが少なくとも一部グラフト結合した樹脂であ
る上記特許請求の範囲第１項記載の防舷材等に」いる袋
状シートの製造方法。[Scope of Claims] 1. Two layers of woven or knitted fabrics are connected at certain points with connecting threads to regulate the distance between them and form gaps to form a quilted bag-like body. , fill the gaps of the bag-like body with thermoplastic foamed resin particles, heat the foamed resin particles with steam to thermally expand them to form a foam, and use the foam to form the quilted shape. A method for manufacturing a bag-like sheet used for fenders, etc., characterized by filling the inside of the bag-like body. 2. The method for manufacturing a bag-like sheet for use in fenders, etc. as claimed in claim 1, wherein the bag-like body is formed by using a part of the woven yarn or knitted yarn as a connecting yarn. 8. The bag-like sheet used for fenders, etc. according to claim 1, wherein the bag-like body is formed using a thread or string different from the kneaded thread or knitted thread as a connecting thread. Production method. 4. The method for manufacturing a bag-like sheet for use in fenders, etc. as claimed in claim 1, wherein the foam is a resin in which at least a portion of a polyolefin resin and a polystyrene resin are graft-bonded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58015963A JPS59142119A (en) | 1983-02-01 | 1983-02-01 | Manufacture of baglike sheet used as fender or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58015963A JPS59142119A (en) | 1983-02-01 | 1983-02-01 | Manufacture of baglike sheet used as fender or the like |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59142119A true JPS59142119A (en) | 1984-08-15 |
| JPH0365255B2 JPH0365255B2 (en) | 1991-10-11 |
Family
ID=11903373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58015963A Granted JPS59142119A (en) | 1983-02-01 | 1983-02-01 | Manufacture of baglike sheet used as fender or the like |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59142119A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002061048A (en) * | 2000-08-09 | 2002-02-28 | Miyakoori Kk | Woven fabric and method for producing the same |
| WO2010131972A2 (en) * | 2009-05-15 | 2010-11-18 | Lantor B.V. | Flexible protective sheet and its use |
| CN105235832A (en) * | 2015-11-03 | 2016-01-13 | 无锡同春新能源科技有限公司 | Buoyancy block with PIN core material and PE buoyancy box wrapped by glass fiber coated with ultraviolet-proof materials |
| CN105383648A (en) * | 2015-11-22 | 2016-03-09 | 无锡同春新能源科技有限公司 | Water floating UAV (Unmanned Aerial Vehicle) parking platform produced through buoyancy material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6315365U (en) * | 1986-07-15 | 1988-02-01 |
-
1983
- 1983-02-01 JP JP58015963A patent/JPS59142119A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6315365U (en) * | 1986-07-15 | 1988-02-01 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002061048A (en) * | 2000-08-09 | 2002-02-28 | Miyakoori Kk | Woven fabric and method for producing the same |
| WO2010131972A2 (en) * | 2009-05-15 | 2010-11-18 | Lantor B.V. | Flexible protective sheet and its use |
| WO2010131972A3 (en) * | 2009-05-15 | 2011-03-31 | Lantor B.V. | Flexible protective sheet and its use |
| CN105235832A (en) * | 2015-11-03 | 2016-01-13 | 无锡同春新能源科技有限公司 | Buoyancy block with PIN core material and PE buoyancy box wrapped by glass fiber coated with ultraviolet-proof materials |
| CN105383648A (en) * | 2015-11-22 | 2016-03-09 | 无锡同春新能源科技有限公司 | Water floating UAV (Unmanned Aerial Vehicle) parking platform produced through buoyancy material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0365255B2 (en) | 1991-10-11 |
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