JPH0510492A - High strength pipe end screw protector and manufacture thereof - Google Patents
High strength pipe end screw protector and manufacture thereofInfo
- Publication number
- JPH0510492A JPH0510492A JP3164497A JP16449791A JPH0510492A JP H0510492 A JPH0510492 A JP H0510492A JP 3164497 A JP3164497 A JP 3164497A JP 16449791 A JP16449791 A JP 16449791A JP H0510492 A JPH0510492 A JP H0510492A
- Authority
- JP
- Japan
- Prior art keywords
- pipe end
- sheet
- reinforcing material
- end screw
- mold
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Buffer Packaging (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、管端にねじを有してい
る配管用管、油井管等のねじ保護具及びその製造方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw protector for pipes, oil well pipes and the like having a screw at the pipe end, and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】管端にねじを有する管を搬送する場合、
搬送時の打撃等により、ねじ部に損傷が生じないよう
に、ねじ部を保護する部材が必要である。このような保
護材として、一般的に管端のねじに螺合する鉄製または
樹脂製の部材が使用されているが、それぞれ下記の欠点
がある。2. Description of the Related Art When transporting a pipe having a screw at the pipe end,
It is necessary to provide a member that protects the threaded portion so that the threaded portion is not damaged by hitting during transportation. As such a protective material, an iron or resin member that is screwed into a pipe end screw is generally used, but each has the following drawbacks.
【０００３】（１） 鉄製：管端のねじ山と保護材のね
じ山が鉄同士であり、衝撃を受けた場合に、ねじ部に焼
付きが発生し易い。
（２） 樹脂製：強度が鉄より低いため、肉厚が鉄と同
じでは、打撲時にねじ山の保護ができず、そのため部材
の肉厚を厚くする必要があり高価である。
そこで、上記の欠点を改善したものとして、鉄と樹脂を
複合させた保護具が、実開昭５３−３３０１１号公報に
開示されている。このような保護具は、使用後の処置に
問題を残している。つまり、保護具は運搬時に損傷を受
け、再使用には耐えずほとんどが廃却されているが、鉄
と樹脂との複合体であるため焼却することもスクラップ
化して再利用することもできずほとんどが地中に埋設処
理されており、環境公害の一因となっている。(1) Iron: The thread of the pipe end and the thread of the protective material are made of iron, and seizure is likely to occur in the threaded portion when a shock is applied. (2) Resin: Since the strength is lower than that of iron, if the wall thickness is the same as iron, it is not possible to protect the screw threads at the time of bruising, so it is necessary to increase the wall thickness of the member and it is expensive. Therefore, as a solution to the above-mentioned drawbacks, a protector in which iron and resin are combined is disclosed in Japanese Utility Model Publication No. 53-33011. Such protective equipment remains problematic in treatment after use. In other words, the protective equipment was damaged during transportation and could not endure reuse, and most of it was discarded, but since it is a composite of iron and resin, it cannot be incinerated or scrapped for reuse. Most of them are buried underground, contributing to environmental pollution.
【０００４】[0004]
【発明が解決しようとする課題】そこで本発明者はさき
に、パルプ繊維と強化合成樹脂とから成る原料を用い、
これをシートにした後、加熱して金型に装入し、加熱成
形する管端ねじ保護具を提案した。（特願平３−１２１
２４５号）。このような保護具は通常の取扱い条件下で
は管端ねじを十分に保護し、使用後に焼却処理可能なす
ぐれた性能を有している。しかし、取扱い等が乱雑な条
件下では、さらに高強度を要求される場合がある。Therefore, the present inventor previously used a raw material composed of pulp fiber and reinforced synthetic resin,
A pipe end screw protector has been proposed in which this is formed into a sheet, which is then heated and charged into a mold to be heat-formed. (Japanese Patent Application No. 3-121
245). Under the normal handling conditions, such a protector sufficiently protects the pipe end screw and has an excellent performance of incineration after use. However, under conditions where handling is rough, higher strength may be required.
【０００５】本発明はこのような要望を満足する管端ね
じ保護具及びその製造方法を提供することを目的とす
る。It is an object of the present invention to provide a pipe end screw protector and a method for manufacturing the same, which satisfies such a demand.
【０００６】[0006]
【課題を解決するための手段】本発明は、天然繊維を５
０重量％以上含有する素材から成り、内面又は外面にね
じを有し、壁内に補強材を内蔵した中空円筒状をなし、
前記ねじは管端ねじに螺合してこれを保護するねじであ
ることを特徴とする高強度管端ねじ保護具である。この
場合、中空円筒は一端を蓋で閉止した形状でもよい。SUMMARY OF THE INVENTION The present invention provides a natural fiber 5
It is made of a material containing 0% by weight or more, has a screw on the inner surface or the outer surface, and has a hollow cylindrical shape with a reinforcing material embedded in the wall.
The high-strength tube end screw protector is characterized in that the screw is a screw that is screwed into a pipe end screw to protect it. In this case, the hollow cylinder may have a shape in which one end is closed with a lid.
【０００７】このような保護具を製造するにはパルプと
合成樹脂を混合して抄紙を行い、乾燥してシート状に
し、このシートを補強材と共に金型内に挿入して加圧成
形し、補強材を壁内に内蔵した成形品を成形する。この
場合、前記シートは矩形状とし、その二辺を突合わせて
円筒形として金型に挿入してもよく、また、シートを帯
状とし、これを渦巻状に多層巻し、その層間に補強材を
挾んで金型に挿入することとしてもよく、さらに前記シ
ートを膜状とし、渦巻状に多層巻し、その層間に補強材
を挾んだ後輪切切断して金型に挿入することとしてもよ
い。In order to manufacture such a protector, pulp and synthetic resin are mixed to make paper, which is then dried to form a sheet, which is inserted into a mold together with a reinforcing material and pressure-molded, Mold a molded product with a reinforcement inside the wall. In this case, the sheet may have a rectangular shape, and two sides thereof may be abutted with each other to form a cylindrical shape, and the sheet may be inserted into a mold. It may be inserted into the mold by sandwiching the sheet, and further, the sheet is formed into a film and wound in multiple layers, and a reinforcing material is sandwiched between the layers and cut into a ring and inserted into the mold. Good.
【０００８】[0008]
【作用】本発明の保護具は、壁内に補強材を内蔵してい
るので高い強度と靭性を保有させることができ、苛酷な
取扱いを受ける管のねじ部の保護に適する。本発明の保
護具は天然繊維を５０重量％以上含有するため、樹脂製
品に比較して発熱量が小さい。したがって、使用後に一
般の焼却炉で焼却可能となり、使用後の廃却処理の問題
を改善することができる。このような天然繊維としては
パルプ等の天然有機繊維を用いるとよく、無機繊維も使
用することができる。The protector of the present invention, which has a reinforcing material built into the wall, can retain high strength and toughness, and is suitable for protecting the threaded portion of a pipe subjected to severe handling. Since the protector of the present invention contains 50% by weight or more of natural fiber, it generates less heat than resin products. Therefore, it becomes possible to incinerate in a general incinerator after use, and the problem of waste treatment after use can be improved. As such a natural fiber, a natural organic fiber such as pulp may be used, and an inorganic fiber may also be used.
【０００９】補強材としては、無機繊維、有機繊維又は
金属繊維から成る袋編状、布状又は網状の補強材とし、
円筒状保護具の特に円周方向に引張強度の高い素材が好
ましい。合成樹脂としては、天然繊維と配合して成形し
たとき強度と靭性を示す材料を用いる。このような合成
樹脂としては、例えばポリプロピレン単一成分、ポリオ
レフィン複合成分、ポリエチレン単一成分、ナイロン系
複合成分、フィブリル化アクリル等が好適である。The reinforcing material is a bag-knitted, cloth-shaped or net-shaped reinforcing material made of inorganic fiber, organic fiber or metal fiber,
A material having a high tensile strength in the circumferential direction of the cylindrical protector is preferable. As the synthetic resin, a material that exhibits strength and toughness when mixed with natural fibers and molded is used. As such a synthetic resin, for example, polypropylene single component, polyolefin composite component, polyethylene single component, nylon composite component, fibrillated acrylic resin, etc. are suitable.
【００１０】次に本発明の製造方法は、図２に示すよう
に、素材１１としてパルプと合成樹脂を、混合１２、撹
拌１３、抄紙１４、乾燥１５の工程を経てシート状に
し、このシートを矩形状に切断１６して加熱１７する。
このシートを補強材と共に金型内に挿入１８，１９して
加圧成形２０し、中空円筒状成形体の壁内に補強材を内
蔵させる。このとき、金型内の挿入位置、挿入順序など
は、円滑に補強材が内蔵されるようにすればよく限定さ
れない。しかし、補強材の作用を十分に発揮させるよう
に配慮することは必要である。例えば、寸法、材質、補
強材の形状、その他に応じて次のような考慮を払う。Next, in the production method of the present invention, as shown in FIG. 2, pulp and synthetic resin as raw material 11 are made into a sheet through the steps of mixing 12, stirring 13, papermaking 14 and drying 15, and the sheet is formed. It is cut into a rectangular shape 16 and heated 17.
This sheet is inserted into the mold together with the reinforcing material 18 and 19 and pressure-molded 20 to incorporate the reinforcing material into the wall of the hollow cylindrical molded body. At this time, the insertion position in the mold, the insertion order, etc. are not limited as long as the reinforcing material can be smoothly incorporated. However, it is necessary to give consideration so that the effect of the reinforcing material is fully exerted. For example, the following consideration should be taken according to the size, the material, the shape of the reinforcing material, and the like.
【００１１】（ａ） 加圧成形前の素材３を円筒状とし
ての外径を金型内径より小さくしておき、素材３の外径
に網目状の補強材５を外嵌する。
（ｂ） 予め金型内に補強材５を挿入しておき、不定形
の素材３を金型内に挿入して加圧成形する。
（ｃ） 素材をシート状に成形し、これを渦巻状に巻い
てその層間に補強材を挾んで金型内に挿入する。(A) The outer diameter of the material 3 before pressure forming is made cylindrical and is smaller than the inner diameter of the mold, and the mesh-shaped reinforcing material 5 is fitted on the outer diameter of the material 3. (B) The reinforcing material 5 is previously inserted into the mold, and the amorphous material 3 is inserted into the mold and pressure-molded. (C) A material is formed into a sheet shape, which is wound into a spiral shape, and a reinforcing material is sandwiched between the layers and inserted into a mold.
【００１２】（ｄ） 素材と補強材を交互に互層状に挿
入する。
（ｅ） フイラメント状の補強材を素材中に混入する。(D) The material and the reinforcing material are alternately inserted in alternate layers. (E) A filament-shaped reinforcing material is mixed into the material.
【００１３】[0013]
【実施例】本発明方法の製造工程を図１に、加圧成形の
説明図を図２に示した。配合例として下記の素材から成
るものについて実施例を示す。
（１）フィブリル化ポリエチレン： ３０重量％
（２）ポリオレフィン（心材；ポリプロピレン、被覆
材；酢酸ビニール）：１５重量％
（３）リン酸エステル化パルプ：５５重量％
上記素材を混合撹拌し叩解度１１度に設定し、０．５％
の水溶液を繊維の絡み合いの強度を持たすように抄紙方
法により抄き上げ、８０℃にて乾燥し、水分を８％にな
るまで乾燥させてシート状にする。このシートを一片が
成形品の円周に相当する矩形状に切断し、１８０℃に加
熱した。EXAMPLE The manufacturing process of the method of the present invention is shown in FIG. 1, and an explanatory view of pressure molding is shown in FIG. An example will be shown as a compounding example of the following materials. (1) Fibrillated polyethylene: 30% by weight (2) Polyolefin (core material: polypropylene, coating material: vinyl acetate): 15% by weight (3) Phosphate esterified pulp: 55% by weight Beating degree 11 by mixing and stirring the above materials Set to 0.5%
The aqueous solution is prepared by a papermaking method so as to have the strength of entanglement of fibers, dried at 80 ° C., and dried until the water content becomes 8% to form a sheet. One piece of this sheet was cut into a rectangular shape corresponding to the circumference of the molded product and heated to 180 ° C.
【００１４】一方、補強材５として次の仕様の袋編状カ
ーボンファイバを使用した。
フィラメント数： ３０００
糸開度 ： １５
打込本数 ： ２４
形状 ： 円筒状
この補強材を金型内に挿入した。このように予め補強材
５が挿入されている下金型１の中へシートを丸めて挿入
し、上金型２を下金型１に圧入し１００〜２５０ｋｇ／
ｃｍ2 の圧力下で加圧成形し、成形品４を成形した。On the other hand, a bag-knitted carbon fiber having the following specifications was used as the reinforcing material 5. Number of filaments: 3000 Number of yarn openings: 15 Number of driven yarns: 24 Shape: Cylindrical This reinforcing material was inserted into a mold. In this way, the sheet is rolled and inserted into the lower mold 1 in which the reinforcing material 5 is previously inserted, and the upper mold 2 is press-fitted into the lower mold 1 to obtain 100 to 250 kg /
A molded product 4 was molded by pressure molding under a pressure of cm 2 .
【００１５】パルプは長さ１〜２ｍｍ、幅２０〜４０μ
ｍで軸比は２０〜４０、合成樹脂繊維は１〜１８デニー
ル、長さは１〜５ｍｍのものを使用した。このようなパ
ルプを水中に約５重量％〜１重量％程度の濃度に分散す
れば分散し易く水切れがよい。この製造方法により製造
された成形品からサンプルを切り出し、引張強度を測定
したところ、１０００〜１２００ｋｇｆ／ｃｍ2 であ
り、過酷な条件下において用いる保護具として充分な強
度を有する。The pulp has a length of 1 to 2 mm and a width of 20 to 40 μm.
m, the axial ratio was 20 to 40, the synthetic resin fiber was 1 to 18 denier, and the length was 1 to 5 mm. If such a pulp is dispersed in water at a concentration of about 5% by weight to 1% by weight, the pulp is easily dispersed and drains well. A sample was cut out from the molded product manufactured by this manufacturing method, and the tensile strength was measured to be 1000 to 1200 kgf / cm 2, which is sufficient strength as a protector used under severe conditions.
【００１６】[0016]
【発明の効果】本発明の保護具は、引張強度が高く、焼
却処分可能である。本発明方法によれば、このような過
酷な取扱条件下で用いることができる管端ねじ保護機能
にすぐれた保護具を安価に製造することができる。The protector of the present invention has high tensile strength and can be disposed of by incineration. According to the method of the present invention, it is possible to inexpensively manufacture a protector having an excellent pipe end screw protection function that can be used under such severe handling conditions.
【図１】実施例の押出し、加圧成形工程の説明図であ
る。FIG. 1 is an explanatory diagram of an extrusion and pressure molding process of an example.
【図２】管端ねじ保護具の製造工程図である。FIG. 2 is a manufacturing process diagram of a pipe end screw protector.
１ 下金型 ２ 上金型 ３ 素材 ４ 成形品 ５ 補強材 1 Lower mold 2 Upper mold 3 Material 4 Molded product 5 Reinforcement material
Claims (6)
から成り、内面又は外面にねじを有し、壁内に補強材を
内蔵した中空円筒状をなし、前記ねじは管端ねじに螺合
してこれを保護するねじであることを特徴とする高強度
管端ねじ保護具。1. A hollow cylindrical shape which is made of a material containing 50% by weight or more of natural fibers, has a screw on the inner surface or the outer surface, and has a reinforcing material built in the wall, and the screw is screwed to a pipe end screw. A high-strength pipe end screw protector characterized by being a screw that protects it.
る請求項１記載の高強度管端ねじ保護具。2. The high strength pipe end screw protector according to claim 1, wherein the hollow cylinder has a shape in which one end is closed.
い、乾燥してシート状にし、該シートを補強材と共に金
型内に挿入して加圧成形し、補強材を壁内に内蔵した成
形品を成形することを特徴とする高強度管端ねじ保護具
の製造方法。3. A paper is prepared by mixing pulp and synthetic resin, dried and formed into a sheet, and the sheet is inserted into a mold together with a reinforcing material and pressure-molded, and the reinforcing material is incorporated into a wall. A method for manufacturing a high-strength pipe end screw protector, which comprises molding a molded product.
合わせて円筒形として金型内に挿入する請求項３記載の
高強度管端ねじ保護具の製造方法。4. The method for manufacturing a high strength pipe end screw protector according to claim 3, wherein the sheet has a rectangular shape, and two sides thereof are abutted with each other to have a cylindrical shape and inserted into the mold.
し、その層間に補強材を挾んで金型に挿入する請求項３
記載の高強度管端ねじ保護具の製造方法。5. The sheet is formed into a strip shape, is wound in multiple layers in a spiral shape, and a reinforcing material is sandwiched between the layers and is inserted into a mold.
A method for producing the high-strength pipe end thread protector described.
し、その層間に補強材を挾んだ後輪切切断して金型に挿
入する請求項３記載の高強度管端ねじ保護具の製造方
法。6. The high-strength pipe end screw protection according to claim 3, wherein the sheet is formed in a film shape, is wound in multiple layers in a spiral shape, and a reinforcing material is sandwiched between the layers, and is cut into a ring and inserted into a mold. Method of manufacturing ingredients.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3164497A JPH0510492A (en) | 1991-07-04 | 1991-07-04 | High strength pipe end screw protector and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3164497A JPH0510492A (en) | 1991-07-04 | 1991-07-04 | High strength pipe end screw protector and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0510492A true JPH0510492A (en) | 1993-01-19 |
Family
ID=15794285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3164497A Withdrawn JPH0510492A (en) | 1991-07-04 | 1991-07-04 | High strength pipe end screw protector and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0510492A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296808A (en) * | 2011-06-07 | 2011-12-28 | 广州建筑股份有限公司 | Template hoisting system for building |
-
1991
- 1991-07-04 JP JP3164497A patent/JPH0510492A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296808A (en) * | 2011-06-07 | 2011-12-28 | 广州建筑股份有限公司 | Template hoisting system for building |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981008 |