JPH079559A - Manufacture of electric fusion-bonding plastic tube joint - Google Patents
Manufacture of electric fusion-bonding plastic tube jointInfo
- Publication number
- JPH079559A JPH079559A JP15463793A JP15463793A JPH079559A JP H079559 A JPH079559 A JP H079559A JP 15463793 A JP15463793 A JP 15463793A JP 15463793 A JP15463793 A JP 15463793A JP H079559 A JPH079559 A JP H079559A
- Authority
- JP
- Japan
- Prior art keywords
- mandrel
- heating
- electric fusion
- fusion
- pipe
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
- B29D23/003—Pipe joints, e.g. straight joints
- B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、特に接続しようとする
プラスチック管の呼び径が比較的大口径の電気融着式プ
ラスチック管継手の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electric fusion type plastic pipe joint in which a plastic pipe to be connected has a relatively large nominal diameter.
【0002】[0002]
【従来の技術】従来の電気融着式プラスチック管継手
(以下単に管継手ということがある)の製造方法とし
て、特公平1−45410号公報には、外面に螺施溝を有す
る熱可塑性樹脂からなる内筒部材を射出成形し、螺施溝
に電熱線を巻いた後、この内筒部材の外側に同じく外筒
部材を一体的に射出成形して電気融着式プラスチック管
継手を製造する方法が開示されている。2. Description of the Related Art As a conventional method for manufacturing an electric fusion type plastic pipe joint (hereinafter sometimes simply referred to as a pipe joint), Japanese Patent Publication No. 1-45410 discloses a thermoplastic resin having a thread groove on its outer surface. Disclosed is a method for manufacturing an electric fusion-bonded plastic pipe joint by injection-molding an inner cylinder member, winding a heating wire around a screw groove, and then integrally injection-molding an outer cylinder member on the outside of the inner cylinder member. Has been done.
【0003】特公昭61−41293号公報には、射出成形あ
るいは押出し成形で得たパイプを再溶融温度以下の温度
に加熱保持し、一方で熱可塑性樹脂で被覆した電熱線を
拡径マンドレルに巻いて一体的な螺施コイルとなし、前
記加熱されたパイプの内面をこの拡径マンドレルによっ
て拡径しながら前記螺施コイルを圧入し、よって螺施コ
イルをパイプ内面に装着した電気融着式プラスチック管
継手の製造方法が開示されている。In Japanese Patent Publication No. 61-41293, a pipe obtained by injection molding or extrusion molding is heated and maintained at a temperature below the remelting temperature, while a heating wire coated with a thermoplastic resin is wound on a diameter-expanding mandrel. And the inner surface of the heated pipe is expanded by the expanding mandrel to press-fit the threaded coil, so that the threaded coil is attached to the inner surface of the pipe. A method of manufacturing a pipe joint is disclosed.
【0004】特開昭63−71323号公報には、予めマンド
レルに電熱線を巻いた上、これにコネクターピンを接続
し、その外側に金型をセットしてその上に外筒本体を射
出成形し、その後マンドレルを引き抜いて結果的に電熱
線を内蔵した電気融着式プラスチック管継手を製造する
方法が開示されている。In Japanese Patent Laid-Open No. 63-71323, heating wires are wound around a mandrel in advance, connector pins are connected to the mandrel, a mold is set on the outside of the mandrel, and an outer cylinder body is injection-molded on the mold. Then, a mandrel is pulled out after that, and as a result, a method for producing an electric fusion type plastic pipe joint containing a heating wire is disclosed.
【0005】[0005]
【発明が解決しようとする課題】上記した製造方法には
それぞれ一長一短があるが、ここで問題とするのは接続
しようとするパイプの呼び径が例えば150mm以上の大口
径の管継手を製造しようとした場合の問題点である。即
ち上記した製造方法ではいずれも射出成形機あるいは加
熱、圧入装置が必要である。ここで150mm以上の大型の
ものを射出成形するとなると射出成形機自体の射出圧力
や金型の型締力の能力の高いものが必要で、従前の小口
径用の射出成形機等の設備を流用するわけにはいかな
い。従って新しく大容量の射出成形機が、また金型が必
要となり、投資額が多大なものとなる。Each of the above manufacturing methods has merits and demerits, but the problem here is to manufacture a large-diameter pipe joint having a nominal diameter of, for example, 150 mm or more to be connected. This is a problem when doing. That is, all of the above manufacturing methods require an injection molding machine or a heating / press-fitting device. If a large size of 150 mm or more is to be injection molded, it is necessary to have a high injection pressure of the injection molding machine itself and a high mold clamping force, and the existing equipment such as an injection molding machine for small diameters is diverted. I can't do it. Therefore, a new large-capacity injection molding machine and a mold are required, and the investment amount becomes large.
【0006】本発明はこのような問題を解消するもの
で、射出成形機を用いることなく容易にかつ安価に大口
径の電気融着式プラスチック管継手を製造することがで
きる方法を提供することを目的とする。The present invention solves such a problem, and provides a method capable of easily and inexpensively producing a large-diameter electrofusion-type plastic pipe joint without using an injection molding machine. To aim.
【0007】[0007]
【課題を解決するための手段】本発明は、熱可塑性樹脂
製のパイプと、熱可塑性樹脂を被覆した電熱線とからな
る電気融着式プラスチック管継手の製造方法であって、
前記パイプの一端内面を前記被覆電熱線を受け入れる受
口部に形成する過程と、前記被覆電熱線をマンドレルに
密に巻いて1つの加熱部材に形成する過程と、この加熱
部材を含むマンドレルを前記パイプの受口部に挿入する
過程と、前記電熱線に通電を行い加熱部材をパイプ受口
部内面に融着して電気融着接続部材を成形する過程と、
融着した部分が冷却した後マンドレルを取り除く過程
と、上記電気融着接続部材を2個用意し、これら電気融
着接続部材の受口部でない端面同士を加熱溶融すると共
に互いに圧着接合する過程とからなる電気融着式プラス
チック管継手である。DISCLOSURE OF THE INVENTION The present invention is a method for producing an electric fusion type plastic pipe joint comprising a pipe made of a thermoplastic resin and a heating wire coated with the thermoplastic resin.
A step of forming an inner surface of one end of the pipe in a receiving portion for receiving the coated heating wire; a step of closely winding the coated heating wire around a mandrel to form one heating member; and a mandrel including the heating member A step of inserting the pipe into the receiving portion of the pipe, a step of energizing the heating wire to fuse the heating member to the inner surface of the pipe receiving portion to form the electric fusion connecting member,
A step of removing the mandrel after the fused portion is cooled, a step of preparing two of the above-mentioned electric fusion connecting members, heating and melting the end faces of the electric fusion connecting members which are not the receiving portions, and crimping and joining them. Is an electric fusion type plastic pipe joint.
【0008】また上記において、被覆電熱線の代わりに
熱可塑性製のシート材に導電性金属を印刷した加熱シー
トを利用しこれを上記と同様に受口部内面に融着して取
付け電気融着式プラスチック管継手となすようにしても
よい。更に上記した管継手はソケット形のものを対象と
しているが、例えば上記電気融着接続部材をT形あるい
はL形の中間部材を介しこれに対して加熱圧着接合すれ
ばそれぞれエルボあるいはチー形の電気融着式プラスチ
ック管継手を得ることができる。Further, in the above, a heating sheet obtained by printing a conductive metal on a thermoplastic sheet material is used in place of the coated heating wire, and this is attached to the inner surface of the receiving portion by fusion bonding in the same manner as described above. Type plastic pipe joints may be used. Further, although the above-mentioned pipe joint is intended for a socket type, for example, if the electric fusion-bonding member is heated and pressure-bonded to the T-shaped or L-shaped intermediate member via an intermediate member, an elbow-shaped or Q-shaped electric joint, respectively. A fusion type plastic pipe joint can be obtained.
【0009】[0009]
【作用】上記の電気融着式プラスチック管継手によれ
ば、その継手本体部分は、市販のあるいは押出し成形等
によって得たパイプ(例えばポリエチレンパイプ)をそ
のまま利用し、これに適宜追加工をするだけで簡単かつ
安価に製造できる。またもう1つの要素である加熱部材
は、樹脂被覆電熱線あるいは樹脂シートに導電性金属を
プリント印刷などした公知のものを単体として用いる
が、ここでそれ自身が発熱溶融できることを利用して上
記のパイプの受口内面にマンドレルなどを介して挿入配
置し、その後通電加熱をしてこれを受口内面に融着し一
体的に装着するものである。以上により加熱手段を内蔵
した電気融着式の接続部材を得ることができる。次にこ
の接続部材を必要とする管継手の種類に応じて突合わせ
接合をする。即ちソケットであれば接続部材の受口でな
い端面同士を加熱圧着接合(バッド融着)する。またエ
ルボやチーが必要な場合は、それぞれL形、T形の中間
部材を介してこれに接続部材を同様に加熱圧着接合すれ
ばよい。以上により射出成形機等を用いることなく、電
気融着式プラスチック管継手を容易かつ安価に製造する
ことができる。特に呼び150mm以上の大口径の管継手の
ように造り難くいものについては都合が良い。According to the above electric fusion type plastic pipe joint, the joint main body portion is a commercially available pipe (for example, a polyethylene pipe) obtained by extrusion molding or the like, which is used as it is, and an additional process is appropriately performed. Can be manufactured easily and inexpensively. Further, as the heating member which is another element, a known member such as a resin-coated heating wire or a resin sheet on which a conductive metal is printed by printing is used as a single body, but here, by utilizing the fact that the member itself can generate heat and melt, The pipe is inserted and arranged on the inner surface of the receiving port via a mandrel or the like, and then electrically heated to be fused and attached integrally to the inner surface of the receiving port. As described above, it is possible to obtain an electric fusion type connection member having a heating means built therein. Next, butt joining is performed according to the type of pipe joint that requires this connecting member. That is, in the case of a socket, the end faces of the connection member that are not the receiving ports are thermocompression bonded (bad fusion). When an elbow or a chi is required, a connecting member may be similarly thermocompression bonded to the L-shaped and T-shaped intermediate members via the intermediate members. As described above, the electrofusion-type plastic pipe joint can be easily and inexpensively manufactured without using an injection molding machine or the like. It is especially convenient for pipes with a nominal diameter of 150 mm or more that are difficult to make, such as pipe joints.
【0010】[0010]
【実施例】以下、本発明の実施例を図面を参照して説明
する。図1は本発明の一実施例を示し、加熱部材として
被覆電熱線を利用した場合の例である。そのおおよその
製造過程を(A)〜(E)に示す。図1の(A)は(以
下1−(A),(B)…と記す)、後に電気融着式プラ
スチック管継手の本体となる熱可塑性のパイプであり、
ここでは市販のポリエチレンパイプを利用している。1
2,13は貫通穴となっているが、この径は接続しようと
するポリエチレン管の外径に見合うように必要によって
機械加工で形成してもよい。1−(B)は、パイプ1の
一方の端部14側を後述する被覆電熱線からなる加熱部材
が嵌合するような径に追加工して、ポリエチレン管の受
口部121を形成したところである。1−(C)は、熱可
塑性樹脂材で被覆した電熱線3をマンドレル4に密に巻
き付けて1つの加熱部材30に形成した状態を示してい
る。ここで電熱線3には絶縁材を介するなどして図のよ
うにパイプの外側に位置する一端から電熱線の両端が取
り出せるように2条巻きにしたものを用いることが好ま
しい。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention, which is an example of using a coated heating wire as a heating member. The approximate manufacturing process is shown in (A) to (E). (A) of FIG. 1 (hereinafter referred to as 1- (A), (B) ...) is a thermoplastic pipe that will later become the main body of the electric fusion type plastic pipe joint,
A commercially available polyethylene pipe is used here. 1
Although 2 and 13 are through holes, this diameter may be machined as necessary to match the outer diameter of the polyethylene pipe to be connected. In 1- (B), one end 14 side of the pipe 1 is additionally processed to have a diameter such that a heating member composed of a coated heating wire, which will be described later, is fitted to form a receiving portion 121 of a polyethylene pipe. is there. 1- (C) shows a state in which the heating wire 3 coated with the thermoplastic resin material is tightly wound around the mandrel 4 to form one heating member 30. Here, it is preferable that the heating wire 3 is wound in two strands so that both ends of the heating wire can be taken out from one end located outside the pipe as shown in the figure through an insulating material.
【0011】1−(D)は、上記のマンドレル4をその
ままパイプの受口部121へ挿入し、その状態で電熱線3
に通電を行い、加熱部材30を加熱させ、受口部121の内
面と加熱部材30が互いに接触する樹脂部分を溶融して融
着し、加熱部材30をパイプ1の受口部121の内面へ一体
的に取付ける。その後、融着部が冷却したらマンドレル
4のみを引き抜いて取り除く。以上によって加熱部材30
を内蔵する電気融着接続部材1Aを成形するものであ
る。次に1−(E)は、上記で得た電気融着接続部材1
Aと、これと全く同じ電気融着接続部材2Aを用意し、
それぞれの受口部でない側の端面、即ち端面15と25とを
加熱板等によって加熱し、溶融状態にした上で互いに圧
着して接合(バット融着)した状態を示している。以上
によってソケット形の電気融着式プラスチック管継手10
が完成する。尚、図中6はインジケータ用の凹穴であっ
て必要によって機械加工して設ければよい。1- (D) inserts the mandrel 4 as it is into the receiving portion 121 of the pipe, and in that state, the heating wire 3
Is energized to heat the heating member 30, the inner surface of the receiving portion 121 and the resin portion where the heating member 30 contacts each other are melted and fused, and the heating member 30 is transferred to the inner surface of the receiving portion 121 of the pipe 1. Install integrally. After that, when the fused portion is cooled, only the mandrel 4 is pulled out and removed. By the above, heating member 30
The electro-fusion-bonding member 1A containing the is molded. Next, 1- (E) is the electrofusion-bonding member 1 obtained above.
A and the same electric fusion splicing member 2A as this are prepared,
The end faces of the respective non-receptive portions, that is, the end faces 15 and 25 are heated by a heating plate or the like to be in a molten state and then pressure-bonded to each other (butt fusion). Socket-type electric fusion type plastic pipe fitting 10
Is completed. Reference numeral 6 in the drawing denotes a recessed hole for an indicator, which may be machined as required.
【0012】この電気融着式プラスチック管継手とポリ
エチレン管とを接合する場合は、一方の受口部にポリエ
チレン管を挿入した後、外部のコントローラと電熱線を
接続し、呼び径サイズ毎に通電時間を決める等して、通
電加熱して両者を融着接合する。その後もう一方の受口
部に対しても同様に融着接合を行うものである。When joining the electro-fusion type plastic pipe joint and the polyethylene pipe, after inserting the polyethylene pipe into one of the receiving portions, an external controller and a heating wire are connected to energize each nominal size. After deciding the time and the like, the two are fusion-bonded by heating by energization. After that, fusion bonding is similarly performed on the other receiving portion.
【0013】図2は本発明の他の実施例を示し、加熱部
材として加熱シートを利用した場合の例である。そのお
およその製造過程を(A)〜(D)に示しているが、
(D)の次の過程は図1の(E)と同じであるので省略
している。また図1と同じものは同一符号を付した。従
って、図1と異なる点は(C’)で示す加熱部材を用い
る点だけである。(C’)に示すように加熱部材は、熱
可塑性樹脂製の薄膜シートに導電性金属8をプリント印
刷したものを使用する。導電性金属8のプリント模様は
種々考えられるがその両端はパイプの外側に向かって並
列して設けられている。FIG. 2 shows another embodiment of the present invention, in which a heating sheet is used as the heating member. The approximate manufacturing process is shown in (A) to (D).
Since the subsequent process of (D) is the same as that of (E) of FIG. 1, it is omitted. The same parts as those in FIG. 1 are designated by the same reference numerals. Therefore, the only difference from FIG. 1 is that the heating member shown in (C ′) is used. As shown in (C '), a heating member is obtained by printing a conductive metal 8 on a thin film sheet made of a thermoplastic resin. Although various printed patterns of the conductive metal 8 can be considered, both ends thereof are provided in parallel toward the outside of the pipe.
【0014】上記した例はいずれもソケット形の管継手
であったが、エルボやチーが必要な場合は、L形あるい
はT形の熱可塑性樹脂からなる中間部材に上記した電気
融着接続部材をそれぞれ加熱圧着接合すれば適宜製造す
ることができるものである。Although all of the above examples are socket type pipe joints, when an elbow or a chi is required, the above-mentioned electric fusion splicing member is attached to an intermediate member made of L type or T type thermoplastic resin. Each can be appropriately manufactured by thermocompression bonding.
【0015】[0015]
【発明の効果】本発明によれば、射出成形機を用いるこ
となく、被覆電熱線などの加熱部材をパイプの内面に一
体的に装着した電気融着接続部材を得ることができる。
そして、この電気融着接続部材同士を、また中間部材を
介して加熱圧着接合すれば、容易にかつ安価に電気融着
式プラスチック管継手を製造することができる。According to the present invention, it is possible to obtain an electric fusion splicing member in which a heating member such as a coated heating wire is integrally mounted on the inner surface of a pipe without using an injection molding machine.
Then, if the electric fusion-bonding members are joined by thermocompression bonding through the intermediate member, the electrofusion-type plastic pipe joint can be easily manufactured at low cost.
【図1】 本発明の一実施例であって、その製造過程を
説明する図である。FIG. 1 is a drawing for explaining the manufacturing process of the embodiment of the present invention.
【図2】 本発明の他の実施例であって、同じくその製
造過程を説明する図である。FIG. 2 is another embodiment of the present invention, which is also a drawing for explaining the manufacturing process thereof.
1,2…ポリエチレンパイプ 1A,2A…電気融着接続部材 3…熱可塑性樹脂を被覆した電熱線 4…マンドレル 5…加熱圧着接合部 6…インジケータ穴 7…熱可塑性樹脂製の加熱シート 10…電気融着式プラスチック管継手 12,13…パイプ受口部 14,24…受口側端面 15,25…圧着接合側端面 30…加熱部材 1, 2 ... Polyethylene pipe 1A, 2A ... Electric fusion splicing member 3 ... Heating wire coated with thermoplastic resin 4 ... Mandrel 5 ... Thermocompression bonding part 6 ... Indicator hole 7 ... Thermoplastic resin heating sheet 10 ... Electricity Fusion-bonded plastic pipe fittings 12, 13 ... Pipe receiving part 14, 24 ... Receiving side end face 15, 25 ... Crimping joining side end face 30 ... Heating member
Claims (3)
脂を被覆した電熱線とからなる電気融着式プラスチック
管継手の製造方法であって、 前記パイプの一端内面を前記被覆電熱線を受け入れる受
口部に形成する過程と、 前記被覆電熱線をマンドレル
に密に巻いて1つの加熱部材に形成する過程と、 この加熱部材を含むマンドレルを前記パイプの受口部に
挿入する過程と、 前記電熱線に通電を行い加熱部材をパイプ受口部内面に
融着して電気融着接続部材を成形する過程と、 融着した部分が冷却した後マンドレルを取り除く過程
と、 以上によって得た電気融着接続部材を2個用意し、これ
ら電気融着接続部材の受口部でない端面同士を加熱溶融
すると共に互いに圧着接合して電気融着式プラスチック
管継手となす過程とからなることを特徴とする電気融着
式プラスチック管継手の製造方法。1. A method of manufacturing an electrofusion-type plastic pipe joint comprising a thermoplastic resin pipe and a heating wire coated with the thermoplastic resin, wherein an inner surface of one end of the pipe receives the coating heating wire. Forming a receiving portion, forming a single heating member by closely winding the coated heating wire around a mandrel, inserting a mandrel including the heating member into the receiving portion of the pipe, The process of energizing the heating wire and fusing the heating member to the inner surface of the pipe receiving part to form the electric fusion splicing member, the process of removing the mandrel after the fused part is cooled, and the electric fusion obtained by the above Two of the fusion-splicing members are prepared, and the end faces of these electro-fusion-bonding members that are not the receiving portion are heated and melted, and they are pressure-bonded to each other to form an electro-fusion-type plastic pipe joint. And a method for manufacturing an electric fusion type plastic pipe joint.
脂製シートに導電性金属を印刷などして形成した加熱シ
ートとからなる電気融着式プラスチック管継手の製造方
法であって、 前記パイプの一端内面を前記加熱シートを受け入れる受
口部に形成する過程と、 前記加熱シートをマンドレル
に巻く過程と、 この加熱シートを含むマンドレルを前記パイプの受口部
に挿入する過程と、 前記導電性金属に通電を行い加熱シートをパイプ受口部
に融着して電気融着接続部材を成形する過程と、 融着した部分が冷却した後マンドレルを取り除く過程
と、 以上によって得た電気融着接続部材を2個用意し、これ
ら電気融着接続部材の受口部でない端面同士を加熱溶融
すると共に、互いに圧着接合して電気融着式プラスチッ
ク管継手となす過程とからなることを特徴とする電気融
着式プラスチック管継手の製造方法。2. A method for producing an electric fusion-bonding type plastic pipe joint comprising a thermoplastic resin pipe and a heating sheet formed by printing a conductive metal on a thermoplastic resin sheet, the pipe comprising: A step of forming an inner surface of one end into a receiving portion for receiving the heating sheet, a step of winding the heating sheet around a mandrel, a step of inserting a mandrel including the heating sheet into the receiving portion of the pipe, and the conductivity. The process of energizing the metal to fuse the heating sheet to the pipe receiving part to form the electric fusion splicing member, the process of removing the mandrel after the fused portion is cooled, and the electric fusion splicing obtained as above Two members are prepared, and the end faces of the electric fusion-bonding members that are not the receiving portions are heated and melted, and they are pressure-bonded to each other to form an electrofusion-type plastic pipe joint. A method for producing an electric fusion-bonded plastic pipe joint, which is characterized in that:
電気融着接続部材の間に熱可塑性樹脂からなる中間部材
を介してこれらを熱圧着接合することを特徴とする請求
項1又は2記載の電気融着式プラスチック管継手の製造
方法。3. A plurality of the electric fusion splicing members are prepared,
The method for producing an electrofusion-type plastic pipe joint according to claim 1 or 2, wherein the electrofusion-bonding members are thermocompression-bonded to each other via an intermediate member made of a thermoplastic resin.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15463793A JPH079559A (en) | 1993-06-25 | 1993-06-25 | Manufacture of electric fusion-bonding plastic tube joint |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15463793A JPH079559A (en) | 1993-06-25 | 1993-06-25 | Manufacture of electric fusion-bonding plastic tube joint |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH079559A true JPH079559A (en) | 1995-01-13 |
Family
ID=15588565
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15463793A Pending JPH079559A (en) | 1993-06-25 | 1993-06-25 | Manufacture of electric fusion-bonding plastic tube joint |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH079559A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20030040709A (en) * | 2001-11-15 | 2003-05-23 | 김학건 | a |
JP2006283813A (en) * | 2005-03-31 | 2006-10-19 | Hitachi Metals Ltd | Elbow ef joint and its manufacturing method |
CN112805214A (en) * | 2018-12-21 | 2021-05-14 | 太宇工业股份有限公司 | Method for forming frame component of bicycle made of thermoplastic composite material and finished product thereof |
CN113236893A (en) * | 2021-05-31 | 2021-08-10 | 河南中恒信燃气设备股份有限公司 | Secondary-sealing electric melting pipe fitting |
-
1993
- 1993-06-25 JP JP15463793A patent/JPH079559A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20030040709A (en) * | 2001-11-15 | 2003-05-23 | 김학건 | a |
JP2006283813A (en) * | 2005-03-31 | 2006-10-19 | Hitachi Metals Ltd | Elbow ef joint and its manufacturing method |
JP4600819B2 (en) * | 2005-03-31 | 2010-12-22 | 日立金属株式会社 | Elbow type EF joint and manufacturing method thereof |
CN112805214A (en) * | 2018-12-21 | 2021-05-14 | 太宇工业股份有限公司 | Method for forming frame component of bicycle made of thermoplastic composite material and finished product thereof |
CN113236893A (en) * | 2021-05-31 | 2021-08-10 | 河南中恒信燃气设备股份有限公司 | Secondary-sealing electric melting pipe fitting |
CN113236893B (en) * | 2021-05-31 | 2022-08-30 | 河南中恒信燃气设备股份有限公司 | Secondary-sealing electric melting pipe fitting |
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