JP2002317894A - Electrodeposition coupler - Google Patents
Electrodeposition couplerInfo
- Publication number
- JP2002317894A JP2002317894A JP2001121448A JP2001121448A JP2002317894A JP 2002317894 A JP2002317894 A JP 2002317894A JP 2001121448 A JP2001121448 A JP 2001121448A JP 2001121448 A JP2001121448 A JP 2001121448A JP 2002317894 A JP2002317894 A JP 2002317894A
- Authority
- JP
- Japan
- Prior art keywords
- joint
- electric welding
- resin
- synthetic resin
- heating wire
- 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
- Branch Pipes, Bends, And The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電気溶着継手に関
し、熱可塑性樹脂管、特にガスや水道用の配管材に有用
なポリエチレン樹脂管の接続に使用するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric welding joint, which is used for connecting a thermoplastic resin pipe, particularly a polyethylene resin pipe useful for piping materials for gas and water supply.
【０００２】[0002]
【従来の技術】ポリエチレンは化学的に極めて安定であ
り、水道用やガス管用配管材として有用であるが、その
優れた化学的安定性のために、接着剤を介しての接続が
困難である。そこで、ポリエチレン管用継手として、ポ
リエチレン管との接合面に電熱線を埋設した電気溶着継
手が知られている。例えば、図５に示すように、ポリエ
チレン樹脂製の継手本体１’の内周面に抵抗線２’を埋
設し、この抵抗線２’の両端に接続した端子金具２１’
を継手本体１’の外面に突設したものが公知である（例
えば、特開昭５８−１３１０２５号公報）。2. Description of the Related Art Polyethylene is extremely stable chemically and is useful as a piping material for water supply and gas pipes. However, it is difficult to connect via an adhesive because of its excellent chemical stability. . Therefore, as a polyethylene pipe joint, an electric welding joint in which a heating wire is buried in a joint surface with the polyethylene pipe is known. For example, as shown in FIG. 5, a resistance wire 2 'is embedded in the inner peripheral surface of a joint body 1' made of polyethylene resin, and terminal fittings 21 'connected to both ends of the resistance wire 2'.
Is protruded from the outer surface of the joint body 1 '(for example, Japanese Patent Laid-Open No. 58-131025).
【０００３】この電気溶着継手は、射出成形により製造
される。例えば、継手本体と同じポリエチレンを押出被
覆した被覆抵抗線をマンドレルに螺旋状に巻き付けると
共にこの被覆抵抗線の両端に端子金具を接続し、この抵
抗線巻き付けマンドレルの周りに外型を配置して両端子
金具を外型のピン穴で支持すると共にキャビティを形成
し、このキャビティに溶融樹脂をチャージし、ついで、
この充填樹脂をキュアリング（保圧・冷却固化）してい
る（例えば、特開昭６３−７１３２２号公報）。[0003] This electric welding joint is manufactured by injection molding. For example, a sheathed resistance wire formed by extrusion-coating the same polyethylene as the joint body is spirally wound around a mandrel, and terminal fittings are connected to both ends of the sheathed resistance wire. Supporting the metal fittings with the pin holes of the outer mold and forming a cavity, charging the cavity with molten resin,
The filled resin is cured (dwelling and solidifying by cooling) (for example, JP-A-63-71322).
【０００４】前記電気溶着継手を用いて合成樹脂管を接
続するには、図５に示すように、合成樹脂管４’の端部
を電気溶着継手Ａ’に挿入し、電熱線２’を通電発熱さ
せて管−継手界面とその近傍の樹脂を溶融させ、その溶
融樹脂の冷却固化をまって接続を終了している。In order to connect a synthetic resin pipe using the above-mentioned electric welding joint, as shown in FIG. 5, an end of a synthetic resin pipe 4 'is inserted into an electric welding joint A' and an electric heating wire 2 'is energized. Heat is generated to melt the resin at the pipe-joint interface and its vicinity, and the molten resin is cooled and solidified to terminate the connection.
【０００５】[0005]
【発明が解決しようとする課題】通常の合成樹脂製品の
射出成形は、ダイプレートの前進（型締め）→ノズルの
前進→チャージ→キュアリング（保圧・冷却固化）→ノ
ズル後退・ダイプレート復帰・型開き・製品突き出しを
１サイクルとして行われ、この間にプランジャ機やイン
ラインスクリュー等が前記チャージや保圧のために作動
される。しかしながら、電気溶着継手では、電熱線埋設
のために、電熱線を巻き付けたマンドレルを前記ダイプ
レート前進の前の段階で型にセットする必要があり、電
熱線非埋設の通常の継手よりも射出成形のサイクルが長
くなる。In general, injection molding of a synthetic resin product is performed by advancing a die plate (clamping) → advancing a nozzle → charging → curing (holding pressure / cooling and solidifying) → retreating a nozzle / returning a die plate. -Opening of the mold and ejection of the product are performed as one cycle, during which the plunger machine, the in-line screw, and the like are operated for the charge and pressure retention. However, in the electric welding joint, in order to embed the heating wire, it is necessary to set the mandrel around which the heating wire is wound into a mold at a stage before the die plate advancement. Cycle becomes longer.
【０００６】従来の電気溶着継手では、図５に示すよう
に、肉厚を一定にしている。この場合、管内流体に接す
る箇所の肉厚、すなわち、図５において、合成樹脂管
４’の先端４１’に臨む箇所ｅ’の肉厚を、耐内圧上、
合成樹脂管の肉厚以上にする必要がある。而して、従来
の電気溶着継手では、全長を合成樹脂管４’の肉厚ｔ’
以上の一定肉厚Ｔ’としており、継手の樹脂量が多く、
特に、水道管材のような内圧管用の電気溶着継手では、
樹脂量がかなり多量とされている。しかしながら、継手
の樹脂量が多くなると、溶融樹脂のチャージ時間やキュ
アリング時間が長くなり、それだけ射出サイクル時間が
長くなって生産効率の低下が避けられない。[0006] In the conventional electric welding joint, as shown in FIG. 5, the wall thickness is made constant. In this case, the thickness of the part in contact with the fluid in the pipe, that is, in FIG. 5, the thickness of the part e 'facing the tip 41' of the synthetic resin pipe 4 'is increased by increasing the internal pressure resistance.
It is necessary to increase the thickness of the synthetic resin tube. Thus, in the conventional electric welding joint, the total length is determined by the thickness t 'of the synthetic resin pipe 4'.
With the above constant thickness T ', the amount of resin in the joint is large,
In particular, in electric welding joints for internal pressure pipes such as water pipe materials,
The amount of resin is considered to be quite large. However, when the amount of resin in the joint increases, the charging time and curing time of the molten resin become longer, and the injection cycle time becomes longer accordingly, which inevitably lowers the production efficiency.
【０００７】前記電気溶着継手の射出成形では、電熱線
の端子金具が外型に嵌合され、この状態でチャージ樹脂
が冷却収縮される結果、端子金具と電熱線との連結箇所
に引張り力が作用する。而るに、樹脂量が多いほど、樹
脂収縮量も多くなり、前記引張り力が大きくなり、特
に、ポリエチレンでは、熱収縮や結晶収縮が大きく、前
記引張り力が一層に大きくなる。従って、電熱線と端子
金具との連結箇所の異常により電気抵抗値が増加し、電
熱線の両端子間の抵抗値増大のために、所定の時間通電
しても、所定の溶着を行い得ないことがある。更に、電
気溶着継手の高重量による取り扱い上の不利、接続作業
の作業性低下も否定し難い。In the injection molding of the electric welding joint, the terminal fitting of the heating wire is fitted into the outer mold, and the charge resin is cooled and shrunk in this state. Works. Thus, as the amount of resin increases, the amount of resin shrinkage increases, and the tensile force increases. Particularly, in polyethylene, thermal shrinkage and crystal shrinkage increase, and the tensile force further increases. Therefore, the electrical resistance value increases due to an abnormality in the connection portion between the heating wire and the terminal fitting. Due to the increase in the resistance value between the two terminals of the heating wire, the predetermined welding cannot be performed even if the current is supplied for a predetermined time. Sometimes. Furthermore, it is difficult to deny the disadvantage in handling due to the heavy weight of the electric welding joint and the reduction in workability of the connection work.
【０００８】本発明の目的は、電気溶着継手の射出成形
サイクルの短縮化により生産性の向上や電熱線連結箇所
の電気抵抗値の安定化を図ると共に継手の小型化、軽量
化を図ることにある。It is an object of the present invention to improve productivity by stabilizing the injection molding cycle of an electric welding joint, to stabilize the electric resistance value at a heating wire connection point, and to reduce the size and weight of the joint. is there.
【０００９】[0009]
【課題を解決するための手段】本発明に係る電気溶着継
手は、継手本体に、その内面を合成樹脂管外面に溶着さ
せるための電熱線を埋設した合成樹脂製継手において、
内面をテーパ状にしたことを特徴とする構成である。An electric welding joint according to the present invention is a synthetic resin joint in which a heating wire for welding an inner surface of the joint body to an outer surface of the synthetic resin tube is embedded in the joint body.
The inner surface is tapered.
【００１０】上記の電気溶着継手には、埋設抵抗線の通
電発熱により管材と溶着される継手が全て包含され、例
えば、両受けソケット、片受けソケット、レジューサ、
エルボー、チーズ等を挙げることができる。The above-mentioned electric welding joints include all joints which are welded to a pipe material by the heat generation of the buried resistance wire, for example, a double socket, a single socket, a reducer,
Elbow, cheese, etc. can be mentioned.
【００１１】[0011]
【発明の実施の形態】以下、図面を参照しつつ本発明の
実施の形態について説明する。図１は、本発明に係る電
気溶着継手の一実施例を示す図面である。図１におい
て、１は熱可塑性樹脂製、例えばポリエチレンやポリブ
テン製の継手本体であり、内面中央にストッパー１１を
設け、継手本体の両端部内面を除いて、ストッパー１１
の両側内面１２，１２をテーパ状としてある。このテー
パは、通常、１／２〜１／５とされる。２はテーパ内面
１２に螺旋状に埋設した電熱線である。２１は電熱線２
の両端に接続した端子金具であり、継手本体１の端部表
面に植設してある。この電熱線２には、抵抗線、例えば
ニクロム線に合成樹脂を被覆した被覆抵抗線を使用で
き、被覆樹脂には、継手本体と同一の樹脂、例えば、ポ
リエチレンやポリブテン等を用いることができる。前記
ストッパー１１は、合成樹脂管端の位置決めのために必
要とされ、その巾ａは、通常５ｍｍ程度とされる。前記
継手本体端部の電熱線非埋設部分ｂは、電熱線の通電発
熱による樹脂の溶融時、溶融樹脂の流出を防止するため
に必要とされ、通常、１０〜２０ｍｍ程度とされる。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a drawing showing one embodiment of an electric welding joint according to the present invention. In FIG. 1, reference numeral 1 denotes a joint body made of a thermoplastic resin, for example, polyethylene or polybutene, provided with a stopper 11 at the center of the inner surface, and excluding the inner surfaces of both ends of the joint body.
Are tapered. This taper is usually set to 1/2 to 1/5. Reference numeral 2 denotes a heating wire spirally embedded in the tapered inner surface 12. 21 is a heating wire 2
Are connected to both ends of the joint body 1 and are implanted on the end surface of the joint body 1. The heating wire 2 may be a resistance wire, for example, a coated resistance wire obtained by coating a nichrome wire with a synthetic resin, and the coating resin may be the same resin as the joint body, for example, polyethylene or polybutene. The stopper 11 is required for positioning the end of the synthetic resin pipe, and its width a is usually about 5 mm. The heating wire non-embedded portion b at the end of the joint body is required to prevent the molten resin from flowing out when the resin is melted by the heat generated by the heating wire, and is usually about 10 to 20 mm.
【００１２】図２は本発明に係る電気溶着継手を使用し
た合成樹脂管の接続部を示し、合成樹脂管４の端部をテ
ーパ面４１に切削し、この管端部を継手Ａ内に挿入して
管先端４２をストッパー１１に当接させ、ついで、電熱
線２を通電発熱させて継手内面のテーパ面１２と合成樹
脂管端部のテーパ外面４１とを溶着してある。この接続
部において、管先端４２の継手箇所ｅに実質上、直接に
管内流体の圧力が作用し、この箇所の内径をＤ、作用内
圧をＰ、その箇所ｅでのフープストレスをｆ、肉厚をｈ
（通常、合成樹脂管４の肉厚以上に設定）とすれば、FIG. 2 shows a connecting portion of a synthetic resin pipe using the electric welding joint according to the present invention. The end of the synthetic resin pipe 4 is cut into a tapered surface 41, and this pipe end is inserted into the joint A. Then, the pipe tip 42 is brought into contact with the stopper 11, and then the heating wire 2 is energized and heated to weld the tapered surface 12 on the inner surface of the joint and the tapered outer surface 41 on the end of the synthetic resin tube. At this connection, the pressure of the fluid in the pipe acts substantially directly on the joint point e of the pipe tip 42, the inner diameter of this point is D, the working internal pressure is P, the hoop stress at that point e is f, the wall thickness is H
(Usually set equal to or greater than the thickness of the synthetic resin tube 4),
【数１】ｈ＝ＤＰ／（２ｆ） の関係があり、内径Ｄが従来の内面平坦継手（内径が合
成樹脂管外径に等しくされている）に較べて小さいため
に、同一のフープストレスｆのもとでの肉厚ｈを従来の
継手よりも薄くできる。前記の継手箇所ｅ以外の部分で
は、管端部と継手との総厚みが前記の厚みｈ以上とされ
ているから、耐圧強度を充分に満たしている。而して、
継手の最小肉厚部分ｂは、すなわち電熱線非埋設部分の
肉厚ｈ’を合成樹脂管４の肉厚よりも充分に薄くでき、
この部分を薄くするほど、継手内面をテーパ状にしたこ
とによる内面切欠き容積量を多くできる。更に、継手の
内径を内面にテーパが無いものに較べて小さくできるか
ら、かかる面からも、継手の樹脂容積を少なくできる。
従って、継手の樹脂量を継手内面が平坦の従来の電気溶
着継手に対しほぼ半分程度にまで減少できる。## EQU1 ## Since there is a relationship of h = DP / (2f), the inner diameter D is smaller than that of a conventional flat joint on the inner surface (the inner diameter is made equal to the outer diameter of the synthetic resin pipe). Can be made thinner than conventional joints. In a portion other than the joint portion e, the total thickness of the pipe end and the joint is equal to or greater than the thickness h, so that the pressure resistance is sufficiently satisfied. Thus,
The minimum thickness portion b of the joint, that is, the thickness h ′ of the non-embedded portion of the heating wire can be made sufficiently smaller than the thickness of the synthetic resin pipe 4,
As this portion is made thinner, the inner cutout volume due to the tapered inner surface of the joint can be increased. Further, since the inner diameter of the joint can be made smaller than that having no taper on the inner surface, the resin volume of the joint can be reduced from such a surface.
Accordingly, the amount of resin in the joint can be reduced to about half that of a conventional electro-welded joint having a flat inner surface.
【００１３】本発明に係る電気溶着継手を製造するに
は、図３に示すように、左右二分割の内型５１のテーパ
面に被覆抵抗線２を巻き付け、その抵抗線２の両端にそ
れぞれ端子金具２１をかしめ接合し、この被覆抵抗線巻
き付け内型５１を外型５２にセットすると共に端子金具
２１を外型内面の穴５３に嵌合し、次いで、外型と内型
とで形成されたキャビティ５０に溶融樹脂を射出により
チャージし、更に保圧し、このチャージ樹脂の冷却固化
をまって離型することができる。あるいは、図４に示す
ように、予め成形した太鼓形の内筒部材（通常、継手と
同一樹脂で射出成形される）１０に裸抵抗線２を巻き付
け、内筒部材端の各植設端子ピン２１に抵抗線２の各端
部を溶接し、この抵抗線２巻き付け内筒部材１０をコア
５１に装着し、更に、このコア５１を外型５２にセット
すると共に端子ピン２１を外型内面の穴５３に嵌合し、
次いで、外型と内型とで形成されたキャビティ５０に溶
融樹脂を射出によりチャージし、更に保圧し、このチャ
ージ樹脂の冷却固化をまって離型することもできる。As shown in FIG. 3, in order to manufacture the electric welding joint according to the present invention, the sheathed resistance wire 2 is wound around the tapered surface of the inner mold 51 which is divided into two parts on the left and right sides. The metal fitting 21 was caulked and joined, the coated resistance wire wound inner mold 51 was set on the outer mold 52, and the terminal metal fitting 21 was fitted into the hole 53 on the inner surface of the outer mold. Then, the outer mold and the inner mold were formed. The molten resin is charged into the cavity 50 by injection, the pressure is further maintained, and the charged resin is cooled and solidified to be released. Alternatively, as shown in FIG. 4, the bare resistance wire 2 is wound around a drum-shaped inner cylindrical member 10 (usually injection-molded with the same resin as the joint) 10, and each of the implanted terminal pins at the end of the inner cylindrical member is used. Each end of the resistance wire 2 is welded to 21, the resistance wire 2 wound inner tube member 10 is mounted on a core 51, the core 51 is set on an outer mold 52, and the terminal pins 21 are connected to the inner surface of the outer mold. Fits into hole 53,
Next, the molten resin is charged into the cavity 50 formed by the outer mold and the inner mold by injection, the pressure is further maintained, and the charged resin is cooled and solidified to be released.
【００１４】上記射出成形の１サイクル時間Ｔは、被覆
抵抗線巻き付け内型を外型にセットするか、抵抗線巻き
付け内筒部材を装着したコアを外型にセットするのに要
する時間t1→ダイプレートの前進（型締め）時間ｔ2→
ノズル前進時間ｔ3→チャージ時間ｔ4→キュアリング時
間（保圧・冷却固化時間）ｔ5→ノズル後退・ダイプレ
ート復帰・型開き・製品突き出し時間ｔ6の総和で与え
られる（この間にプランジャ機やインラインスクリュー
等が前記チャージや保圧のために作動される）。The one cycle time T of the injection molding is a time t 1 required for setting the inner mold wound with the coated resistance wire on the outer mold or setting the core having the inner cylindrical member wound with the resistance wire on the outer mold. Die plate advance (clamping) time t 2 →
Nozzle advance time t 3 → charge time t 4 → curing time (holding pressure / cooling / solidification time) t 5 → nozzle retreat / die plate return / mold opening / product ejection time t 6 Or an in-line screw or the like is actuated for the charge or pressure holding).
【００１５】本発明に係る電気溶着継手においては、電
気溶着継手であるため、すなわち、電熱線埋設のため
に、被覆抵抗線巻き付け内型を外型にセットするか、抵
抗線巻き付け内筒部材を装着したコアを外型にセットす
るための時間t1を必要とするが、前記した通り、樹脂量
を従来の電気溶着継手に較べほぼ半減できるから、チャ
ージ時間ｔ4及びキュアリング時間（保圧・冷却固化時
間）ｔ5をそれだけ短くでき、射出成形サイクルを充分
に短縮でき、電熱線非埋設の従来の継手と同程度の製造
速度で製造することも可能となる。また、射出成形にお
ける樹脂冷却時の熱収縮や結晶化収縮等による収縮量を
少なくでき、それだけその収縮により電熱線と端子との
間に作用する引張り力を軽減できるから、電熱線の両端
子間の電気抵抗値の安定化を図ることができる。また、
電気溶着継手の小型化、軽量化により接続作業や継手の
運搬・保管作業を容易に行うことができる。In the electric welding joint according to the present invention, since the electric welding joint is an electric welding joint, that is, in order to embed a heating wire, the inner mold wound around the coated resistance wire is set to the outer mold, or the inner cylindrical member wound around the resistance wire is used. requires a time t 1 to set the mounting cores in the outer mold, as described above, since the amount of resin can be almost halved compared with the conventional electric welding joint, the charge time t 4 and the curing time (holding pressure - cooling and solidification time) t 5 to be much shorter, it can sufficiently reduce the injection molding cycle, it is possible to produce with conventional fittings and comparable production rate of the heating line non embedded. In addition, the amount of shrinkage due to heat shrinkage or crystallization shrinkage during resin cooling during injection molding can be reduced, and the shrinkage can reduce the tensile force acting between the heating wire and the terminal. Can be stabilized. Also,
The connection work and the transportation / storage work of the joint can be easily performed by reducing the size and weight of the electric welding joint.
【００１６】[0016]
【発明の効果】本発明に係る電気溶着継手では、樹脂量
を従来の電気溶着継手に較べて著しく少なくできるか
ら、射出成形サイクルを短縮化して生産効率を向上で
き、電熱線非埋設の従来の継手と同程度の射出成形サイ
クルで製造することも可能となる。また、射出成形時の
樹脂収縮量を少なくでき、その収縮により電熱線と端子
との連結箇所に作用する引張り力をそれだけ軽減してそ
の連結箇所の電気抵抗値を安定に保持できる結果、電熱
線の通電電流の一定化をよく保証でき、良好な溶着を確
保できる。更に、電気溶着継手の小型化、軽量化により
接続作業の作業性の向上、保管・運搬の容易化を図るこ
とができる。According to the electric welding joint of the present invention, the amount of resin can be significantly reduced as compared with the conventional electric welding joint, so that the injection molding cycle can be shortened and the production efficiency can be improved. It can also be manufactured in the same injection molding cycle as a joint. In addition, the amount of resin shrinkage during injection molding can be reduced, and the shrinkage reduces the tensile force acting on the connection point between the heating wire and the terminal, thereby stably maintaining the electrical resistance value at the connection point. , It is possible to ensure that the current is constant, and secure good welding. Further, the miniaturization and weight reduction of the electric welding joint can improve the workability of the connection work and facilitate storage and transportation.
【図１】本発明に係る電気溶着継手の一実施例を示す図
面である。FIG. 1 is a drawing showing one embodiment of an electric welding joint according to the present invention.
【図２】本発明に係る電気溶着継手を用いた合成樹脂管
の接続部を示す図面である。FIG. 2 is a view showing a connecting portion of a synthetic resin pipe using the electric welding joint according to the present invention.
【図３】本発明に係る電気溶着継手の製造方法の一例を
示す図面である。FIG. 3 is a drawing showing an example of a method for manufacturing an electric welding joint according to the present invention.
【図４】本発明に係る電気溶着継手の製造方法の別例を
示す図面である。FIG. 4 is a drawing showing another example of a method for manufacturing an electric welding joint according to the present invention.
【図５】従来の電気溶着継手を示す図面である。FIG. 5 is a drawing showing a conventional electric welding joint.
１ 継手本体 １２ テーパ面 ２ 電熱線 ２１ 端子金具 ｂ 継手本体両端の電熱線非埋設部分 DESCRIPTION OF SYMBOLS 1 Joint main body 12 Tapered surface 2 Heating wire 21 Terminal fitting b Non-embedding part of heating wire at both ends of joint main body
Claims (1)
溶着させるための電熱線を埋設した合成樹脂製継手にお
いて、内面をテーパ状にしたことを特徴とする電気溶着
継手。1. A synthetic resin joint in which a heating wire for welding an inner surface of the joint body to an outer surface of the synthetic resin pipe is embedded in a joint body, wherein the inner surface is tapered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001121448A JP2002317894A (en) | 2001-04-19 | 2001-04-19 | Electrodeposition coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001121448A JP2002317894A (en) | 2001-04-19 | 2001-04-19 | Electrodeposition coupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002317894A true JP2002317894A (en) | 2002-10-31 |
Family
ID=18971319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001121448A Pending JP2002317894A (en) | 2001-04-19 | 2001-04-19 | Electrodeposition coupler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002317894A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017049412A1 (en) * | 2015-09-24 | 2017-03-30 | Shawcor Ltd. | Joint for thermoplastic pipe, assembly and method |
| KR101818324B1 (en) * | 2016-03-04 | 2018-01-15 | 주식회사 엠엠피 | Electro-fusion apparatus for transfer tube of fluid including chemical material |
-
2001
- 2001-04-19 JP JP2001121448A patent/JP2002317894A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017049412A1 (en) * | 2015-09-24 | 2017-03-30 | Shawcor Ltd. | Joint for thermoplastic pipe, assembly and method |
| KR101818324B1 (en) * | 2016-03-04 | 2018-01-15 | 주식회사 엠엠피 | Electro-fusion apparatus for transfer tube of fluid including chemical material |
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