JP2727111B2 - Manufacturing method of pneumatic fender - Google Patents
Manufacturing method of pneumatic fenderInfo
- Publication number
- JP2727111B2 JP2727111B2 JP1107577A JP10757789A JP2727111B2 JP 2727111 B2 JP2727111 B2 JP 2727111B2 JP 1107577 A JP1107577 A JP 1107577A JP 10757789 A JP10757789 A JP 10757789A JP 2727111 B2 JP2727111 B2 JP 2727111B2
- Authority
- JP
- Japan
- Prior art keywords
- inner bag
- canvas
- bag
- angle
- axis
- 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.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B59/00—Hull protection specially adapted for vessels; Cleaning devices specially adapted for vessels
- B63B59/02—Fenders integral with waterborne vessels or specially adapted therefor, e.g. fenders forming part of the hull or incorporated in the hull; Rubbing-strakes
- B63B2059/025—Fenders integral with waterborne vessels or specially adapted therefor, e.g. fenders forming part of the hull or incorporated in the hull; Rubbing-strakes pneumatic, e.g. inflatable
-
- 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
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、船舶の接岸時に緩衝体として使用される空
気式防舷材の製造方法に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a pneumatic fender used as a buffer when a ship berths.
従来の技術 一般に、空気式防舷材のまゆ玉状内袋１の作成に際し
ては、第１図ないし第３図に示すように、内袋の半形に
相当する形状、すなわち円筒体の先端を略半球形にした
形状のモールド２を用い（第１図）、その外周面３に中
央で折返して内側部分５外側部分６を重合したゴム製の
重合体４を装着し（第２図）、この状態で重合体４を加
熱して成型、加硫処理を行い、その後重合体４をモール
ド２から脱して、その内側部分５を外側部分６との重合
状態から外方に引き出し、この重合体４内に空気を封入
することによって内袋１が作られていた（第３図）。2. Description of the Related Art In general, when producing a pouch-shaped inner bag 1 made of pneumatic fenders, as shown in FIGS. 1 to 3, a shape corresponding to a half-shaped inner bag, that is, a tip of a cylindrical body is formed. Using a mold 2 having a substantially hemispherical shape (FIG. 1), a polymer 4 made of rubber, which is folded back at the center and polymerized on an inner portion 5 and an outer portion 6, is mounted on the outer peripheral surface 3 (FIG. 2). In this state, the polymer 4 is heated and molded and vulcanized. Thereafter, the polymer 4 is removed from the mold 2, and the inner portion 5 is pulled out from the polymerization state with the outer portion 6. The inner bag 1 was made by filling air into the inner bag 4 (FIG. 3).
上記製造過程から明らかなように、内袋１は内外部分
の径の差により中央折返し部で段差７を生じ、折返し部
を境に外側部分（第３図左方部分）６は大径に内側部分
（同右方部分）５は小径に形成される。As is apparent from the above manufacturing process, the inner bag 1 has a step 7 at the center folded portion due to the difference in diameter between the inside and the outside, and the outer portion (the left portion in FIG. 3) 6 has a large diameter inside at the folded portion. The part (the right part) 5 is formed with a small diameter.
そして、この内袋１を加圧し、加圧状態の内袋をモー
ルドとして、その外周面に順次内側ゴム層８、ゴム引き
補強コード層９、外側ゴム層10を巻回し、成型、加硫し
て上記積層体による外袋11を構成するが、前記したよう
に内袋１は中央を境にして左右で径が異なるので、この
状態で外袋11を形成すると内袋１の左右の径の差がその
まま外袋の径の差となって表れ、完成品である防舷材が
左右で径の異なる非対称となって実用上問題があった。
したがって、外袋11の作製に先だち、内袋１の小径部で
ある内側部分５に予じめゴム材18等を巻装して、大径部
である外側部分６と同径とし、中央段差のない左右対称
形にすることが行われていた。（第４図） 発明が解決しようとする課題 上記技術は、モールドを用いて内袋を容易に製造する
ことができるので一般に用いられているが、反面上記し
たように内袋が中央部で段差を生じ左右非対称となるこ
とは避けられない。Then, the inner bag 1 is pressurized, the inner bag in a pressurized state is used as a mold, and an inner rubber layer 8, a rubberized reinforcing cord layer 9, and an outer rubber layer 10 are sequentially wound around the outer peripheral surface thereof, and molded and vulcanized. As described above, the outer bag 11 is formed by the above-described laminated body. However, as described above, the inner bag 1 has different diameters on the left and right with respect to the center. The difference appears directly as the difference in the diameter of the outer bag, and the fender, which is a finished product, has an asymmetrical shape with different diameters on the left and right sides, which has a practical problem.
Therefore, prior to the production of the outer bag 11, the rubber material 18 or the like is previously wound around the inner portion 5, which is the small diameter portion of the inner bag 1, to have the same diameter as the outer portion 6 which is the large diameter portion. A symmetrical shape without any was used. (FIG. 4) The problem to be solved by the invention is generally used because the inner bag can be easily manufactured by using a mold. However, as described above, the inner bag has a step at the center as described above. It is unavoidable that this will cause left-right asymmetry.
そして、従来技術は前記したように内袋のこの左右非
対称を是正するために，外袋巻装に先だち小径部にゴム
材を巻着する等の多くの材料と製造工程を必要とするも
のであった。In order to correct the left-right asymmetry of the inner bag as described above, the prior art requires many materials and manufacturing steps such as winding a rubber material around a small diameter portion before winding the outer bag. there were.
本発明は、このような中央部に段差を有する内袋にお
いて上記難点を克服し、外袋の装着に先だって内袋に何
ら加工を施すことなく、所定の空気圧を加えるだけで小
径部と大径部が略同径となるように膨張する内袋を得る
ことを目的とするものである。The present invention overcomes the above drawbacks in the inner bag having a step in the central portion, without applying any processing to the inner bag prior to mounting the outer bag, by applying a predetermined air pressure to the small-diameter portion and the large-diameter portion. It is an object of the present invention to obtain an inner bag that expands so that the portions have substantially the same diameter.
課題を解決するための手段及び作用 本発明は上記目的に沿って、内袋の略半形状に形成さ
れたモールド外周面に内袋となる帆布を折重ねて装着
し、成型、加硫後該帆布をモールドから取り外して中央
部を境に左右で径の異なる内袋を作り、該内袋内に空気
を圧入した状態で内袋外面に外袋を被覆形成する空気式
防舷材の製造方法において、帆布を剛性の異なる複数種
類の糸で構成し、大径部側帆布の剛性の高い方の糸の軸
方向に対する角度を小径部側帆布の剛性の高い方の糸の
角度より所定角度大とし、この角度の差により内袋へ内
圧を加えたとき前記左右部分が略同一径に拡径して左右
対称形となるようにしたもので、外袋装着に先だち内袋
に所定の空気圧を加えると、帆布の剛性の高い方の糸の
軸方向に対する角度において大径部側が小径部側より大
であるので、帆布の伸び剛性の差により小径部側の半径
方向伸張が大径部側の伸張よりも大きく両者は略同一径
となる。Means and Actions for Solving the Problems According to the present invention, in accordance with the above objects, a canvas serving as an inner bag is folded over and mounted on the outer peripheral surface of a mold formed into a substantially half-shape of an inner bag, and molded and vulcanized after vulcanization. A method of manufacturing a pneumatic fender in which a canvas is removed from a mold to form inner bags having different diameters on the left and right from a center portion, and the outer bag is formed on the outer surface of the inner bag while air is pressed into the inner bag. In the above, the canvas is composed of a plurality of types of yarns having different rigidities, and the angle of the large-diameter portion canvas with respect to the axial direction of the higher-rigidity yarn is larger than the angle of the small-diameter portion canvas with the higher rigidity by a predetermined angle. When the internal pressure is applied to the inner bag due to the difference in the angle, the left and right portions are expanded to substantially the same diameter to be symmetrical, and a predetermined air pressure is applied to the inner bag before the outer bag is attached. Is added, the large-diameter portion has a small angle with respect to the axial direction of the rigid yarn of the canvas. Since it is larger than the diameter part side, the radial expansion on the small diameter part side is larger than the expansion on the large diameter part side due to the difference in elongation rigidity of the canvas, and both have substantially the same diameter.
実施例 実施例について図面を参照して説明する。Embodiment An embodiment will be described with reference to the drawings.
内袋１を作るために、内袋の半形状に相当する、円筒
体の先端を半球形状に形成したモールド２を用いること
は、第１図に示した従来技術と同じである。The use of a mold 2 in which the tip of a cylindrical body is formed in a hemispherical shape, which corresponds to the half shape of the inner bag, to make the inner bag 1 is the same as the prior art shown in FIG.
また、中央部で折返し内側部分５、外側部分６からな
る重合体４を形成し、この重合体４をモールド２の外周
面３に装着し、この状態で加熱して成型、加硫処理を行
い、その後重合体４をモールド２から脱して、その内側
部分５を外側部分６との重合状態から外方に引き出し、
この重合体４の軸方向両端に開口部12を設け、この開口
部12に口金具13を取り付け、該口金具13を介して重合体
４内に空気を封入することにより内袋１を作る方法も第
１図ないし第３図に示した従来技術と特に異なるところ
はない。Further, a polymer 4 comprising a folded inner portion 5 and an outer portion 6 is formed at the center portion, and this polymer 4 is mounted on the outer peripheral surface 3 of the mold 2 and heated and molded and vulcanized in this state. The polymer 4 is then removed from the mold 2 and its inner part 5 is pulled out of its superposed state with the outer part 6,
A method of forming the inner bag 1 by providing openings 12 at both ends in the axial direction of the polymer 4, attaching a base 13 to the openings 12, and sealing the air into the polymer 4 through the base 13. Also, there is no particular difference from the prior art shown in FIGS. 1 to 3.
本実施例は上記方法において重合体４、すなわちまゆ
玉状内袋１を構成する帆布14を剛性の高い横糸15とこれ
と直交して配列された剛性の低い縦糸16からなるゴム引
布で構成し、この横糸15,縦糸16の軸方向角度を内側部
分（小径部分）５と外側部分（大径部分）６で異なら
せ、内側部分５の横糸15aは内袋１の軸線17と平行に、
したっがて縦糸16aは直角に、外側部分６の横糸15b,縦
糸16bは軸線17に対して傾斜して配列されている。In the present embodiment, in the above method, the polymer 4, that is, the canvas 14 constituting the eyebrow ball-shaped inner bag 1 is constituted by a rubberized cloth comprising a high-rigidity weft 15 and a low-rigidity warp 16 arranged orthogonally thereto. The weft 15 and the warp 16 have different axial angles between the inner part (small diameter part) 5 and the outer part (large diameter part) 6, and the weft 15 a of the inner part 5 is parallel to the axis 17 of the inner bag 1.
Accordingly, the warp yarn 16a is arranged at a right angle, and the weft yarn 15b and the warp yarn 16b of the outer portion 6 are arranged obliquely with respect to the axis 17.
第５図は、上記帆布14が未伸張時の内袋１を示すもの
で、内袋１は前記重合体４の折返し部に相当する部分に
段差７が形成されて重合体４の外側部分６に相当する左
側部分は大径に、内側部分５に相当する右側部分は小径
にそれぞれ形成されている。FIG. 5 shows the inner bag 1 when the canvas 14 is not stretched. The inner bag 1 has a step 7 formed at a portion corresponding to the folded portion of the polymer 4 and an outer portion 6 of the polymer 4. Is formed in a large diameter, and the right part corresponding to the inner part 5 is formed in a small diameter.
そして、この状態で内袋１に口金具13を介して加圧空
気を封入して行くと、次第に帆布14が伸張し、内袋１は
膨張していくが、帆布14内の横糸15,縦糸16、特に剛性
の高い横糸15の角度が前記したように外側部分６の大径
部と内側部分５の小径部とで異なるので、内袋１がその
軸線方向と直角方向すなわち半径方向に膨張する度合が
異なり、小径部が大径部に比べ大きく伸張し、所定内圧
を加えると両部分５・６が略均等径となり、前記段差７
が解消して内袋１外面が全長にわたり略面一となる（第
６図参照）。Then, when pressurized air is sealed into the inner bag 1 through the mouthpiece 13 in this state, the canvas 14 gradually expands, and the inner bag 1 expands. 16, since the angle of the particularly stiff weft yarn 15 is different between the large diameter portion of the outer portion 6 and the small diameter portion of the inner portion 5 as described above, the inner bag 1 expands in a direction perpendicular to its axial direction, that is, in a radial direction. The degree is different, and the small diameter portion expands more greatly than the large diameter portion, and when a predetermined internal pressure is applied, both portions 5 and 6 have substantially the same diameter.
Is resolved, and the outer surface of the inner bag 1 is substantially flush over the entire length (see FIG. 6).
この点について詳述すると、第７図において、帆布14
の横糸15及び縦糸16の配列方向をそれぞれ直交異方性主
軸Ｘ軸及びＹ軸とし、このＸ軸とθの角度をなす内袋の
長手方向及び半径方向をそれぞれｘ軸ｙ軸とし、x,y軸
のX,Y軸に関する方向余弦をそれぞれ1,m及び−1,mとす
る。ここで１＝cosθ、ｍ＝sinθである。This will be described in detail with reference to FIG.
The weft yarn 15 and the warp yarn 16 are arranged orthogonally anisotropic principal axes X axis and Y axis, respectively, and the longitudinal direction and the radial direction of the inner bag making an angle of θ with this X axis are respectively x axis y axis, x, The direction cosine of the y-axis with respect to the X and Y axes is 1, m and -1, m, respectively. Here, 1 = cos θ and m = sin θ.
上記のように表したとき、帆布のx,y軸方向の応力成
分と、X,Y軸方向の応力成分との関係を弾性力学の式に
基づいてマトリックス表示すると次のようになる。When expressed as described above, the relationship between the stress components in the x and y axis directions of the canvas and the stress components in the X and Y axis directions is expressed as a matrix based on the equation of elastic mechanics.
あるいは σx … ｘ軸方向の引張応力 σy … ｙ軸方向の引張応力 τxy … xy軸に関するせん断応力 σX … Ｘ軸方向の引張応力 σY … Ｙ軸方向の引張応力 τXY … XY軸に関するせん断応力 同じように帆布のXY,xy両座標軸に関する歪成分の間
にも次の関係式がある。 Or σx: Tensile stress in the x-axis direction σy: Tensile stress in the y-axis direction τxy: Shear stress in the xy axis σX: Tensile stress in the X-axis direction σY: Tensile stress in the Y-axis direction τXY: Shear stress in the XY axis The following relational expression also exists between the distortion components regarding the XY and xy coordinate axes.
あるいは εx … x軸方向の縦歪 εy … y軸方向の縦歪 γxy … xy軸に関するせん断歪 εX … X軸方向の縦歪 εY … Y軸方向の縦歪 γXY … XY軸に関するせん断歪 次に、歪と応力の関係については同じく複合材料に関
する弾性力学に関する式から次のように表すことができ
る。 Or εx… longitudinal strain in the x-axis direction εy… longitudinal strain in the y-axis direction γxy… shear strain in the xy axis εX… longitudinal strain in the XY axis εY… longitudinal strain in the Y-axis direction γXY… shear strain in the XY axis Next, strain Similarly, the relationship between and the stress can be expressed as follows from the equation regarding the elastic mechanics of the composite material.
ここで、cij＝（i,j＝x,y,s）はコンプライアンス係
数で次の式で表される。 Here, cij = (i, j = x, y, s) is a compliance coefficient and is represented by the following equation.
EX … 帆布のＸ軸方向の縦弾性係数 （横糸の縦弾性係数） EY … 同Ｙ軸方向の縦弾性係数 （縦糸の縦弾性係数） GXY … 同せん断弾性係数 νX … 同Ｘ軸方向のポアソン比 νY … 同Ｙ軸方向のポアソン比 以上、（１）ないし（６）の式に基づいて内袋に内圧
がかかったときの帆布の半径方向の伸びを求めることが
できる。 EX… the longitudinal elastic modulus of the canvas in the X-axis direction (the longitudinal elastic modulus of the weft) EY… the longitudinal elastic modulus in the same Y-axis direction (the longitudinal elastic modulus of the warp) GXY… the same shear modulus νX… the Poisson's ratio in the same X-axis direction νY Poisson's ratio in the Y-axis direction As described above, the radial elongation of the canvas when an inner pressure is applied to the inner bag can be obtained based on the equations (1) to (6).
今、本実施例において、 EX ＝ 400kg/cm2 EY ＝ 35kg/cm2 GXY＝ ν30kg/cm2 νX ＝ Y＝ 0.49 として、これら数値を（６）式に代入し、かつ帆布角
度θを定めれば、前記Cijを求めることができ、次に本
実施例の内袋に関し、 ｔ＝（肉厚）＝4mm ｄ（小径部側の内径）＝600mm ｐ（内圧）＝0.05kg/cm2 に設定すると、これらの数値に基づいて小径部側の外径
D1が608mmに、大径部側の外径D2が616mmにそれぞれ定ま
るので内圧を受ける薄肉円筒の応力σｘ・σｙが であることから（５）式のσx,σｙを求めることができ
る。なお、τxyは０とする。Now, in this embodiment, EX = 400 kg / cm 2 EY = 35 kg / cm 2 GXY = ν30 kg / cm 2 νX = Y = 0.49 These values are substituted into the equation (6), and the canvas angle θ is determined. Then, the above-mentioned Cij can be obtained, and then, for the inner bag of this embodiment, t = (thickness) = 4 mm d (inner diameter at the small diameter side) = 600 mm p (internal pressure) = 0.05 kg / cm 2 Then, based on these values, the outer diameter of the small diameter part side
D 1 is 608Mm, the outer diameter D 2 of the large-diameter portion side stress sigma] x · .sigma.y thin cylinder receiving the internal pressure so determined respectively 616mm Therefore, σx and σy of the equation (5) can be obtained. Note that τxy is set to 0.
したがって、前述のCijと上記σx,σｙの値を（５）
式に代入することによりεx,εｙを求めることができ
る。Therefore, the above-mentioned Cij and the values of σx and σy are expressed by (5)
By substituting into the equations, εx and εy can be obtained.
そして、計算の結果、前記条件のもとでは上記εｙは
θが０度のとき0.0419、θが45度のとき0.0255であるの
で伸張後の前記D1，D2はそれぞれ D1＝（１＋0.0419）×608≒633mm D2＝（１＋0.0255）×616≒632mm となり、小径部側の帆布の横糸を内袋の軸と平行に、大
径部側の帆布の横糸を軸と45度に傾斜して配列させると
小径部側、大径部側をともに略同径に膨張させることが
できる。なお、同径とするための角度は前記種々のファ
クターによって異なってくるのはいうまでもない。As a result of the calculation, under the above conditions, the above εy is 0.0419 when θ is 0 degree and 0.0255 when θ is 45 degrees. Therefore, the expanded D 1 and D 2 are respectively D 1 = (1 + 0. 0419) × 608 ≒ 633mm D 2 = (1 + 0.0255) × 616 ≒ 632mm, and the weft of the canvas on the small diameter side is parallel to the axis of the inner bag, and the weft of the canvas on the large diameter side is 45 ° with the axis. When arranged in an inclined manner, both the small diameter portion side and the large diameter portion side can be expanded to have substantially the same diameter. It goes without saying that the angle for obtaining the same diameter differs depending on the above-mentioned various factors.
このようにして製造した内袋の外周に、外袋が前記し
た従来技術と同じように巻着されて防舷材が作られる。The outer bag is wound around the outer bag thus produced in the same manner as in the above-mentioned conventional technique, to produce a fender.
発明の効果 本発明は、以上説明したように内袋を構成する帆布が
大径部と小径部でその軸線に対する角度が異なり、剛性
の高い方の糸の大径部側の角度を小径部側の角度より所
定角度大としたので、内袋に内圧を加えたとき、大径部
側、小径部側の帆布がともに略同径に伸張することがで
き、中央部の段差が解消して内袋の全外周面が面一とな
り、外袋の装着に先だって内袋に何ら左右対称とするた
めの加工を施す必要がない。Effect of the Invention As described above, the canvas constituting the inner bag is different in angle with respect to the axis between the large diameter portion and the small diameter portion, and the angle of the large diameter portion of the higher rigidity yarn is changed to the small diameter portion side. When the internal pressure is applied to the inner bag, both the large-diameter portion and the small-diameter portion can expand to approximately the same diameter when the internal pressure is applied to the inner bag. The entire outer peripheral surface of the bag is flush, and there is no need to perform any processing to make the inner bag symmetrical before mounting the outer bag.
したがって、材料及び製造工程数が少なくて済み、空
気式防舷材を容易に製造することができる。Therefore, the number of materials and the number of manufacturing steps are reduced, and the pneumatic fender can be easily manufactured.
【図面の簡単な説明】 第１図ないし第３図は内袋を製造する過程を示す図、第
４図は上記工程により製造された従来の防舷材の正面
図、第５図は本発明に係る内袋の正面図、第６図は膨張
後の内袋の正面図、第７図は内袋の傾斜した帆布に関す
る説明図である。 １…内袋、２…モールド、３…モールド外周面、４…重
合体、５…内側部分、６…外側部分、７…段差、８…内
側ゴム層、９…ゴム引き補強コード層、10…外側ゴム
層、11…外袋、12…開口部、13…口金具、14…帆布、15
…横糸、16…縦糸、17…軸線、18…ゴム材。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 3 are views showing a process of manufacturing an inner bag, FIG. 4 is a front view of a conventional fender manufactured by the above process, and FIG. , FIG. 6 is a front view of the inner bag after inflation, and FIG. 7 is an explanatory diagram relating to the inclined canvas of the inner bag. DESCRIPTION OF SYMBOLS 1 ... Inner bag, 2 ... Mold, 3 ... Mold outer peripheral surface, 4 ... Polymer, 5 ... Inner part, 6 ... Outer part, 7 ... Step, 8 ... Inner rubber layer, 9 ... Rubberized reinforcing cord layer, 10 ... Outer rubber layer, 11 ... outer bag, 12 ... opening, 13 ... mouthpiece, 14 ... canvas, 15
... weft, 16 ... warp, 17 ... axis, 18 ... rubber material.
フロントページの続き (72)発明者 石井 和夫 神奈川県横浜市泉区新橋町８―15 (56)参考文献 特開 昭60−143940（ＪＰ，Ａ) 特公 昭51−44032（ＪＰ，Ｂ２)Continuation of the front page (72) Inventor Kazuo Ishii 8-15 Shimbashi-cho, Izumi-ku, Yokohama-shi, Kanagawa Prefecture (56) References JP-A-60-143940 (JP, A) JP-B-51-44032 (JP, B2)
Claims (1)
面に内袋となる帆布を折重ねて装着し、成型、加硫後該
帆布をモールドから取り外して中央部を境に左右で径の
異なる内袋を作り、該内袋内に空気を圧入した状態で内
袋外面に外袋を被覆形成する空気式防舷材の製造方法に
おいて、帆布を剛性の異なる複数種類の糸で構成し、大
径部側帆布の剛性の高い方の糸の軸方向に対する角度を
小径部側帆布の剛性の高い方の糸の角度より所定角度大
とし、この角度の差により内袋へ内圧を加えたとき前記
左右部分が略同一径に拡径して左右対称形となるように
したことを特徴とする空気式防舷材の製造方法。1. A canvas which is to be an inner bag is folded and mounted on the outer peripheral surface of a mold formed into a substantially half-shape of an inner bag, and after molding and vulcanization, the canvas is removed from the mold and left and right around a central portion. In a method for manufacturing a pneumatic fender in which inner bags having different diameters are formed and the outer bag is formed on the outer surface of the inner bag while air is pressed into the inner bag, the canvas is composed of a plurality of types of yarns having different rigidities. The angle with respect to the axial direction of the higher-rigidity yarn of the large-diameter portion canvas is set to a predetermined angle larger than the angle of the higher-rigidity yarn of the small-diameter portion canvas, and the internal pressure is applied to the inner bag by the difference in the angle. Wherein said left and right portions are expanded to substantially the same diameter to form a left-right symmetrical shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1107577A JP2727111B2 (en) | 1989-04-28 | 1989-04-28 | Manufacturing method of pneumatic fender |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1107577A JP2727111B2 (en) | 1989-04-28 | 1989-04-28 | Manufacturing method of pneumatic fender |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02289714A JPH02289714A (en) | 1990-11-29 |
| JP2727111B2 true JP2727111B2 (en) | 1998-03-11 |
Family
ID=14462700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1107577A Expired - Lifetime JP2727111B2 (en) | 1989-04-28 | 1989-04-28 | Manufacturing method of pneumatic fender |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2727111B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113167041A (en) * | 2019-01-09 | 2021-07-23 | 横滨橡胶株式会社 | Inflatable fender |
| KR20220035629A (en) * | 2020-09-14 | 2022-03-22 | 와이엠아이 주식회사 | An underwater fender and its manufacturing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10968587B2 (en) * | 2017-07-12 | 2021-04-06 | The Yokohama Rubber Co., Ltd. | Pneumatic fender |
-
1989
- 1989-04-28 JP JP1107577A patent/JP2727111B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113167041A (en) * | 2019-01-09 | 2021-07-23 | 横滨橡胶株式会社 | Inflatable fender |
| KR20220035629A (en) * | 2020-09-14 | 2022-03-22 | 와이엠아이 주식회사 | An underwater fender and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02289714A (en) | 1990-11-29 |
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