JPS59158243A - Manufacture of metallic pipe coated with synthetic resin - Google Patents
Manufacture of metallic pipe coated with synthetic resinInfo
- Publication number
- JPS59158243A JPS59158243A JP58033239A JP3323983A JPS59158243A JP S59158243 A JPS59158243 A JP S59158243A JP 58033239 A JP58033239 A JP 58033239A JP 3323983 A JP3323983 A JP 3323983A JP S59158243 A JPS59158243 A JP S59158243A
- Authority
- JP
- Japan
- Prior art keywords
- metal tube
- synthetic resin
- coated
- resin
- outer diameter
- 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.)
- Pending
Links
Landscapes
- Laminated Bodies (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は合成樹脂被覆金属管の製造方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a synthetic resin-coated metal tube.
従来、金属管の外面にポリエチレン、ポリ塩化ビニル等
の熱可塑性樹脂をクロスヘッドダイ等の樹脂被覆層を剥
ぎ取り、接続用のテーパねじ切り加工が行なわれている
。Conventionally, a resin coating layer of a thermoplastic resin such as polyethylene or polyvinyl chloride is removed from the outer surface of a metal tube using a crosshead die, and a tapered thread for connection is cut.
しかしながら、この場合、樹脂被覆層を形成したのち1
.ねじ切り加工を施す際、金属管と樹脂被覆層との接着
性の良否により、ねじ切り加工が難しくなったり、ある
い#′i′樹脂被覆層が損傷され防食性が低下するとい
う問題があった。又、金属管を運搬・移送する際、管同
志の接触などにより、管端部に設けられたねじ部のねじ
山がつぶれて接続ができなくなり、このため再度ねじ切
シ加工を施さなければならないという問題もあった。However, in this case, after forming the resin coating layer,
.. When performing thread cutting, depending on the adhesion between the metal tube and the resin coating layer, the thread cutting process becomes difficult, or the #'i' resin coating layer is damaged, resulting in a decrease in corrosion resistance. Additionally, when transporting or transporting metal pipes, the threads on the threads at the ends of the pipes may become crushed due to contact between the pipes, making it impossible to connect, and the pipes must be threaded again. There were also problems.
本発明者らは、あらかじめ一方もしくけ両方の端部外周
に雄ねじが設けられた金属管(以下ねじ付き金属管と言
う。)を用い、該金属管の外面に合成樹脂を押出被覆す
ることにより上記、従来の被覆後のねじ切り加工による
問題点を改良しようと試みた。The present inventors used a metal tube (hereinafter referred to as a threaded metal tube) with male threads provided on the outer periphery of one or both ends of the tube, and by extrusion coating the outer surface of the metal tube with a synthetic resin. An attempt was made to improve the problems caused by the conventional thread cutting process after coating.
しかしながら、ねじ付金属管の外面に合成樹脂例えばポ
リ塩化ビニル樹脂を押出被覆する場合、溶融樹脂がクロ
スへラドダイから吐出される際、径方向にふくれあがる
現象(所謂バラス効果)が起り、ねじ部付近においてら
っは状に広がってねじ部を被覆保護できないという問題
があった。この問題はクロスへラドグイの構造を変更(
例えばグイランド部を長くする)することによって多少
改良汀なされているが、大幅な改良には至っていない。However, when the outer surface of a threaded metal tube is coated with a synthetic resin such as polyvinyl chloride resin by extrusion, when the molten resin is discharged from the rad die to the cross, a phenomenon in which it bulges in the radial direction (the so-called ballast effect) occurs, causing damage to the threaded portion. There was a problem in that the threaded portion could not be covered and protected because it spread out in the shape of a hole in the vicinity. This problem changed the structure of Ladogui to cross (
For example, some improvements have been made by lengthening the Guiland section, but this has not resulted in significant improvements.
本発明者らは鋭意検討した結果、ねじ付金属管の端部に
、鍔部と挿着部とがら々る栓体を挿着して押出被覆する
こ七により以上の欠点が改良されることを認識し、本発
明を完成するに至った。As a result of extensive studies, the inventors of the present invention have found that the above-mentioned drawbacks can be improved by inserting and extruding a stopper with a flange and an insertion part into the end of a threaded metal tube. This led to the completion of the present invention.
本発明の要旨は、外径が金属管の外径とほぼ等し、該金
属管の外面に合成樹脂を押出被覆することを特徴とする
合成樹脂被覆金属管の製造方法に存する。The gist of the present invention resides in a method for producing a synthetic resin-coated metal tube, the outer diameter of which is approximately equal to the outer diameter of the metal tube, and characterized in that the outer surface of the metal tube is coated with a synthetic resin by extrusion.
以下不発8Aを図面に基づいて説明する。The unexploded 8A will be explained below based on the drawings.
第1図〜第2図は本発明の製造工程を示す説明図である
。FIGS. 1 and 2 are explanatory diagrams showing the manufacturing process of the present invention.
1け金属管であり、その端部外周にチー−へ雄ねじ2が
設けられている。この雄ねじ2け金属管1の両端部に設
けられていても一方の端部のみに5taffられたもの
であってもよい。It is a single-piece metal tube, and a male thread 2 is provided on the outer periphery of the end thereof. It may be provided at both ends of this two male threaded metal tube 1, or it may be provided with 5 taff only at one end.
3け金属、合成樹脂または無機材料製の栓体であり、鍔
部31と挿着部32七から形成され、該挿着部32が金
属管1の端部に挿着されている。鍔部31の外径は金属
管1の外径とほぼ等しくなされている。鍔部31の外径
が金属管1の外径より小さいと、押出被覆時Km脂が広
がって被覆できず、寸だ大きすぎると金型への挿通が困
難となると共に樹脂の押出条件が急に変化するため均一
な肉厚に被覆できなくなるからである。It is a plug made of metal, synthetic resin, or inorganic material, and is formed from a collar part 31 and an insertion part 327, and the insertion part 32 is inserted into the end of the metal tube 1. The outer diameter of the collar portion 31 is approximately equal to the outer diameter of the metal tube 1. If the outer diameter of the flange 31 is smaller than the outer diameter of the metal tube 1, the Km resin will spread during extrusion coating and will not be coated, and if it is too large, it will be difficult to insert it into the mold and the resin extrusion conditions will be abrupt. This is because the coating changes to a uniform thickness, making it impossible to coat the wall with a uniform thickness.
又、鍔部31の軸方向の長さは500以下の外径のとき
、金属管1の外面に押出被覆される合am脂の種類にも
よるが、ねじ部付近のよりすぐれた密着性を得るには金
属管1の外径の2以上にするのが好ましい。これは、鍔
部3工の長さが短かくなると、被覆樹脂上の接着力が弱
まるために被覆する樹脂厚が厚くなり、ノ(ラス効果に
より樹脂被覆層が径方向にふくれあがる力が生じると、
被覆層がらっは状に広がってしまって栓体3及び雄ねじ
20部分を被覆できない場合があるからである。8部3
1の長さが長いほどねじ部付近の密着性は良くなるが、
コスト面お↓び作業性の面などから、上限として金属管
1の外径の4〜5倍程度までのものが使用される。挿着
部32は栓体3が金属第1にしっがシと嵌合するように
なされていればよく、挿着部32の外径及び軸方向の長
さを、押出被覆する際、金属管1の端部よシ抜は落ちな
いように適宜法めればよい。In addition, when the axial length of the flange 31 has an outer diameter of 500 mm or less, it depends on the type of synthetic resin extruded and coated on the outer surface of the metal tube 1, but it is possible to obtain better adhesion near the threaded portion. In order to achieve this, it is preferable to set the diameter to 2 or more of the outer diameter of the metal tube 1. This is because as the length of the 3-piece flange becomes shorter, the adhesive force on the coating resin weakens and the thickness of the coating resin increases, causing a force that causes the resin coating layer to swell in the radial direction due to the lath effect. and,
This is because the coating layer spreads out in the form of a flake and may not be able to cover the plug 3 and the male thread 20 portion. Part 8 3
The longer the length of 1, the better the adhesion near the threaded part, but
From the viewpoint of cost and workability, the upper limit used is about 4 to 5 times the outer diameter of the metal tube 1. The insertion portion 32 only needs to be configured such that the plug body 3 is tightly fitted into the first metal, and when the outer diameter and axial length of the insertion portion 32 are coated by extrusion, The edge of No. 1 can be fixed as appropriate to prevent it from falling.
第1図で示すように準備された金属管1をクロスヘッド
ダイ(図示せず)内に挿通し、その外面に合成樹脂例え
ばポリ塩化ビニル樹脂を押出被びすることKより、第2
図で示すように金属管1の外面、テーノ曵雄ねじの切り
部21および筒状栓体3の鍔部31の外面に富者して樹
脂被覆4か形成された合成樹脂被覆金属管が得られる。The metal tube 1 prepared as shown in FIG.
As shown in the figure, a synthetic resin-coated metal tube is obtained in which a resin coating 4 is formed on the outer surface of the metal tube 1, the cut portion 21 of the male thread, and the outer surface of the flange portion 31 of the cylindrical plug body 3. .
押出被覆する際密着性をあげるために金属管1及び栓体
3の外周面に接着剤を塗布しておくのがよい。また、雄
ねじ2には防錆剤を塗布しておくのが好ましい。In order to improve adhesion during extrusion coating, it is preferable to apply an adhesive to the outer peripheral surfaces of the metal tube 1 and the plug 3. Further, it is preferable to apply a rust preventive agent to the male thread 2.
上記合成樹脂被覆金属管を施工現場にて接続するには、
第3図で示すようにデー、<雄ねじの切上り部21付近
にて樹脂被覆層4に切シ込み5金入れ、筒状栓体と一緒
に管端部の樹脂被覆層4を取りはずし接続作業を行なえ
ばよい。尚、切り込み5を製造現場で入れておくと接続
作業をより簡単に行なえる。To connect the above synthetic resin coated metal pipes at the construction site,
As shown in Fig. 3, a cut is made in the resin coating layer 4 near the cut-up part 21 of the male thread, and the resin coating layer 4 at the end of the pipe is removed together with the cylindrical plug body for connection work. All you have to do is Incidentally, if the notch 5 is made at the manufacturing site, the connection work can be performed more easily.
尚、上記実施例においては筒状栓体3の挿着部32が金
属管1の内面に挿着されるものを示したが、第4図に示
すように挿着部32′の他に金属管1の端部に設けられ
たチー/(雄ねじ部2に螺合される挿着部33′が設け
られた筒状栓体3′であってもよh0又、MIJ4図に
おいて挿着部32′がないものであってもよ−。In the above embodiment, the insertion part 32 of the cylindrical plug 3 was inserted into the inner surface of the metal tube 1, but as shown in FIG. It may be a cylindrical stopper 3' provided with an insertion part 33' that is screwed into the external threaded part 2, which is provided at the end of the pipe 1. Even if there is no '.
以上述べた通り、本発明合成樹脂金属管の製造方法は端
部外周に雄ねじが設けられた金属管のて金属管の外面に
合成樹脂を押出被覆するものでちるから、端部のねじ部
付近まで密着性よく被覆されると共にねじ部が被覆層で
保護された合成樹脂被覆金属管を得ることができる。As described above, the method for producing a synthetic resin metal tube of the present invention involves extruding and coating the outer surface of the metal tube with a male thread on the outer periphery of the end. It is possible to obtain a synthetic resin-coated metal tube in which the screw portion is coated with good adhesion and the threaded portion is protected by the coating layer.
第1図〜第2図は本発明の製造工程を一部省略して示す
説明図、第3図は切り込み口が設けられた状態を一部省
略し、一部所面で示す正面図、第4図は栓体の変形例を
金属管に挿着した状態を一部省略し、一部所面で示す正
面図である。
l・・・金属管、2・・・デー/<雄ねじ、21・・・
切上り部、3,3′〜・・栓体、31.31’・・・鍔
部、32.32’、33’・・・挿着部、4・・・樹脂
被覆層、5・・・切り込み口。
特許出願人
積水化学工業株式会社
代表者 藤 沼 基 利1 and 2 are explanatory diagrams partially omitting the manufacturing process of the present invention, FIG. 3 is a front view partially omitting the state in which the incision is provided, and FIG. 4 is a partially omitted front view showing a state in which a modified example of the stopper is inserted into a metal tube. l...Metal tube, 2...D/<male thread, 21...
Cut-up portion, 3, 3' to... Plug body, 31.31'... Flange portion, 32.32', 33'... Insertion portion, 4... Resin coating layer, 5... incision. Patent applicant Sekisui Chemical Co., Ltd. Representative Mototoshi Fujinuma
Claims (1)
挿着部とからなる栓体の挿着部を、金属管の外周に雄ね
じが設けられた端部に挿着し、該金属管の外面に合成樹
脂を押出被覆することを特徴とする合成樹脂被覆金属管
の製造方法。L: a flange whose outer diameter is approximately equal to the outer diameter of the metal tube;
A synthetic resin characterized in that the insertion part of a stopper consisting of an insertion part is inserted into an end of a metal tube provided with a male thread on the outer periphery, and the outer surface of the metal tube is coated with a synthetic resin by extrusion. Method for manufacturing coated metal pipes.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58033239A JPS59158243A (en) | 1983-02-28 | 1983-02-28 | Manufacture of metallic pipe coated with synthetic resin |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58033239A JPS59158243A (en) | 1983-02-28 | 1983-02-28 | Manufacture of metallic pipe coated with synthetic resin |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59158243A true JPS59158243A (en) | 1984-09-07 |
Family
ID=12380908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58033239A Pending JPS59158243A (en) | 1983-02-28 | 1983-02-28 | Manufacture of metallic pipe coated with synthetic resin |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59158243A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04129733A (en) * | 1990-09-21 | 1992-04-30 | Matsushita Electric Works Ltd | Terminal protective structure of resin coated metal pipe |
-
1983
- 1983-02-28 JP JP58033239A patent/JPS59158243A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04129733A (en) * | 1990-09-21 | 1992-04-30 | Matsushita Electric Works Ltd | Terminal protective structure of resin coated metal pipe |
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