JPH09280470A - Heating element for electric welding coupling and electrically welded coupling - Google Patents
Heating element for electric welding coupling and electrically welded couplingInfo
- Publication number
- JPH09280470A JPH09280470A JP11053396A JP11053396A JPH09280470A JP H09280470 A JPH09280470 A JP H09280470A JP 11053396 A JP11053396 A JP 11053396A JP 11053396 A JP11053396 A JP 11053396A JP H09280470 A JPH09280470 A JP H09280470A
- Authority
- JP
- Japan
- Prior art keywords
- heating element
- coupling
- conductive particles
- joint
- outer layer
- 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
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5229—Joining tubular articles involving the use of a socket
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/832—Reciprocating joining or pressing tools
- B29C66/8322—Joining or pressing tools reciprocating along one axis
- B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、導電性粒子配合型
の電気融着継手用発熱体及びこれを用いる電気融着継手
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive particle-containing heat generating element for an electric fusion joint and an electric fusion joint using the same.
【０００２】[0002]
【従来の技術】ポリエチレン等の熱可塑性樹脂からなる
パイプ等の被接合材を接合するための電気融着継手が知
られている。電気融着継手は通電により発熱する発熱体
を内蔵しており、その発熱により継手の一部と継手に接
する各被接合材の一部を溶融させ、被接合材を溶融接合
（融着）するものである。2. Description of the Related Art There is known an electric fusion joint for joining materials to be joined such as pipes made of a thermoplastic resin such as polyethylene. The electric fusion joint has a built-in heating element that generates heat when energized. Due to the heat generation, a part of the joint and a part of each material to be joined that is in contact with the joint are melted, and the materials to be joined are melt-bonded (fused). It is a thing.
【０００３】発熱体には、大別して、熱可塑性樹脂から
なる融着層中に電熱線を配置した電熱線配置型発熱体
と、同様の熱可塑性樹脂に導電性カーボンブラック等の
導電性粒子を配合した導電性粒子配合型発熱体がある。
電熱線配置型発熱体では融着完了後も電熱線が異物とし
て残留するのに対して、導電性粒子配合型発熱体中の極
めて微細な導電性粒子は発熱体のベースと一体化してい
るので、融着完了後もそれらが異物化することがないと
いう特徴を有する。Heating elements are roughly classified into heating wire arrangement type heating elements in which heating wires are arranged in a fusion layer made of a thermoplastic resin, and conductive particles such as conductive carbon black in the same thermoplastic resin. There is a conductive particle blending type heating element blended.
In the heating wire arrangement type heating element, the heating wire remains as a foreign substance even after the fusion is completed, whereas the extremely fine conductive particles in the conductive particle mixed type heating element are integrated with the base of the heating element. The feature is that they do not become foreign matter even after the fusion is completed.
【０００４】発熱体を保護する外層には、ポリエチレン
等の熱可塑性樹脂の他に、ポリエステル樹脂、ポリウレ
タン樹脂、ノルボルネン系樹脂等の熱硬化性樹脂が用い
られる。後者の樹脂成型品は形状記憶性を有するので、
そのような外層を有する電気融着継手は、使用前に拡径
を行うことにより、継手への被接合材の挿入を容易にす
ることができる点で好ましい。これらの熱硬化性樹脂の
うち、特にノルボルネン系樹脂では、簡易な金型を用い
る低圧の反応射出成形法（ＲＩＭ）により容易に成形を
行うことができるという利点がある。For the outer layer for protecting the heating element, a thermosetting resin such as polyester resin, polyurethane resin or norbornene resin is used in addition to thermoplastic resin such as polyethylene. Since the latter resin molded product has shape memory,
The electric fusion-bonded joint having such an outer layer is preferable in that it is possible to facilitate insertion of the material to be joined into the joint by expanding the diameter before use. Among these thermosetting resins, particularly norbornene-based resins have an advantage that they can be easily molded by a low-pressure reaction injection molding method (RIM) using a simple mold.
【０００５】しかしながら、発熱体に、例えば被接合材
と同種の一般的な熱可塑性樹脂を用いると、導電性粒子
の均一分散が困難であり、均一分散をさせるために長い
混練時間を要するという問題があった。また、発熱体に
一般的な熱可塑性樹脂を用い、外層に例えばノルボルネ
ン系樹脂等を用いると、発熱体と被接合材との融着は良
好であっても、外層と発熱体との結合力が充分でない場
合があり、強い外力が加わると層間剥離を生じる恐れが
あるという問題が認められた。However, when a general thermoplastic resin of the same type as the material to be joined is used for the heating element, it is difficult to uniformly disperse the conductive particles, and a long kneading time is required to achieve uniform dispersion. was there. When a general thermoplastic resin is used for the heating element and a norbornene-based resin or the like is used for the outer layer, the bonding force between the outer layer and the heating element is good even if the fusion between the heating element and the joined material is good. However, there is a problem that delamination may occur when a strong external force is applied.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記の問題点
を解決するためになされたものであり、導電性粒子配合
型発熱体を有する電気融着継手において、導電性粒子の
均一分散が容易に行われ、被接合材と良好に融着すると
共に、ノルボルネン系樹脂等からなる外層とも充分な強
度で結合しうる発熱体の組成を見出し、そのような発熱
体を用いた電気融着継手を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is easy to uniformly disperse conductive particles in an electric fusion joint having a heating element containing conductive particles. The composition of the heating element that can be well fused with the material to be joined and can be bonded to the outer layer made of norbornene-based resin with sufficient strength, and an electric fusion joint using such a heating element is found. The purpose is to provide.
【０００７】[0007]
【課題を解決するための手段】かくして、本発明によれ
ば、（１）結晶性ポリオレフィンと、炭素数２又は３の
α−オレフィンと他のα−オレフィンとの低結晶性共重
合体と、導電性粒子からなる電気融着継手用発熱体、
（２）外層と内層からなり、該内層が上記（１）記載の
発熱体からなる電気融着継手、及び、（３）前記外層が
ノルボルネン系樹脂からなる上記（２）記載の電気融着
継手、が提供される。Thus, according to the present invention, (1) a crystalline polyolefin and a low crystalline copolymer of an α-olefin having 2 or 3 carbon atoms and another α-olefin, A heating element for an electrofusion joint made of conductive particles,
(2) An electric fusion joint comprising an outer layer and an inner layer, the inner layer comprising the heating element according to (1), and (3) the electrical fusion joint according to (2), wherein the outer layer comprises a norbornene-based resin. , Are provided.
【０００８】上記発熱体における結晶性ポリオレフィン
の結晶化度は、５０％以上７０％未満が好ましく、より
好ましくは５５％以上６５％未満のものである。また、
ポリオレフィンとしてはポリエチレンが好ましく、特に
低密度ポリエチレン（密度約０．９２〜０．９３ｇ／ｃ
ｍ3）が好ましい。高密度ポリエチレンは結晶化度が高
すぎて好ましくない。また、低密度ポリエチレン中で
も、リニア低密度ポリエチレンを用いたものは、ノルボ
ルネン系樹脂からなる外層と最も強固に結合する点、及
び被接合材としてのパイプ等（通常、ポリエチレン製）
の表面と融着し易い点で好ましい。なお、発熱体の内側
にポリエチレン層からなる内層を設け、該内層と被接合
材としてのパイプ等の表面を融着させる場合があるが、
この場合にも、該内層と発熱体との融着性を良好ならし
めるには、発熱体に上記のリニア低密度ポリエチレンを
用いることが望ましい。The crystallinity of the crystalline polyolefin in the heating element is preferably 50% or more and less than 70%, more preferably 55% or more and less than 65%. Also,
Polyethylene is preferable as the polyolefin, and particularly low density polyethylene (density about 0.92 to 0.93 g / c
m3) is preferred. High-density polyethylene is not preferable because the crystallinity is too high. Among low-density polyethylenes, those using linear low-density polyethylene have the strongest bond with the outer layer made of norbornene-based resin, and pipes (usually made of polyethylene) as materials to be joined.
It is preferable in that it is easily fused to the surface of. Incidentally, there is a case where an inner layer made of a polyethylene layer is provided inside the heating element, and the inner layer and the surface of a pipe or the like as a material to be joined are fused.
Also in this case, it is desirable to use the above-mentioned linear low density polyethylene for the heating element in order to improve the fusion property between the inner layer and the heating element.
【０００９】炭素数２又は３のα−オレフィンと他のα
−オレフィンとの低結晶性の共重合体に関して、共重合
体の結晶化度は５０％未満が好ましく、より好ましくは
４５％未満、かつ２０％以上であることが好ましい。他
のα−オレフィンの炭素数は５以下のもの、特に４以下
のもののみを用いることが好ましい。一方のα−オレフ
ィンの炭素数が２の場合は、他方のα−オレフィンは炭
素数が３のものでもよい。具体的には、エチレン・プロ
ピレン共重合体、エチレン・１ブテン共重合体、プロピ
レン・１ブテン共重合体等が例示される。これらの共重
合体はランダム共重合体でもブロック共重合体でもよ
く、結晶化度は概ね２０〜４０％程度である。Α-olefins having 2 or 3 carbon atoms and other α-olefins
With respect to the low crystallinity copolymer with olefin, the crystallinity of the copolymer is preferably less than 50%, more preferably less than 45% and preferably 20% or more. It is preferable to use only other α-olefins having a carbon number of 5 or less, particularly 4 or less. When one α-olefin has 2 carbon atoms, the other α-olefin may have 3 carbon atoms. Specific examples include ethylene / propylene copolymer, ethylene / 1-butene copolymer, propylene / 1-butene copolymer and the like. These copolymers may be random copolymers or block copolymers and have a crystallinity of about 20 to 40%.
【００１０】導電性粒子としてはカーボンブラックが好
ましい。他の導電性粒子、例えば金属粉等も使用できる
が、発熱体の体積固有抵抗値の制御、発熱制御等の点で
カーボンブラックが最も実用的である。例えば、市販の
「ケッチェンブラックＥＣ」（ケッチェンブラック・イ
ンターナショナル社製）適当量を配合することにより電
気融着継手に適する体積固有抵抗値（０．８〜１．５Ω
ｃｍ程度）の発熱体が得られる。Carbon black is preferable as the conductive particles. Although other conductive particles such as metal powder can be used, carbon black is the most practical in terms of controlling the volume specific resistance value of the heating element, controlling heat generation, and the like. For example, by mixing an appropriate amount of commercially available "Ketjen Black EC" (manufactured by Ketjen Black International Co., Ltd.), a volume resistivity value (0.8 to 1.5Ω) suitable for an electric fusion joint is obtained.
A heating element of about cm) is obtained.
【００１１】本発明の発熱体は、上記各成分を好ましく
は１１０〜１２５℃、より好ましくは１１５〜１２３℃
の溶融温度を示すように所定の割合で混合し、公知の成
形法により形成される。In the heating element of the present invention, each of the above components is preferably 110 to 125 ° C, more preferably 115 to 123 ° C.
The mixture is mixed at a predetermined ratio so as to show the melting temperature of, and is formed by a known molding method.
【００１２】混合方法は特に限定されず、バンバリーミ
キサー、プラストミル、ミキシングロール、加圧ニーダ
ー、押出混合機等の処理しやすい形状にして成形する。
成形方法も特に限定されず、押出成形、射出成形、ブロ
ー成形、回転成形、圧縮成型等により、管状など所望の
形状に成形する。The mixing method is not particularly limited, and the mixture is molded into a shape that can be easily treated with a Banbury mixer, a plastomill, a mixing roll, a pressure kneader, an extrusion mixer or the like.
The molding method is not particularly limited, and a desired shape such as a tubular shape is formed by extrusion molding, injection molding, blow molding, rotational molding, compression molding, or the like.
【００１３】本発明に係る電気融着継手は短い管状をな
し、その内層として上記発熱体が用いられる。継手本体
中の外層に用いる樹脂としては、オレフィン系ポリマー
等の他に、ポリノルボルネン系樹脂、ポリウレタン系樹
脂、エポキシ樹脂、ポリエステル樹脂等の熱硬化性樹脂
が例示される。外層にオレフィン系ポリマー等を用いる
場合には、発熱体と外層を共押出法により一挙に形成す
ることも可能である。また、例えばノルボルネン系樹脂
や、ポリウレタン樹脂等の反応射出成形法により製造さ
れる熱硬化性樹脂は、成形された外層が形状記憶性を有
するため、電気融着継手を予め作業し易い内径にまで拡
径して使用することができる。The electrofusion joint according to the present invention has a short tubular shape, and the heating element is used as an inner layer thereof. Examples of the resin used for the outer layer in the joint body include thermosetting resins such as polynorbornene-based resins, polyurethane-based resins, epoxy resins, and polyester resins, in addition to olefin-based polymers. When an olefin polymer or the like is used for the outer layer, it is possible to form the heating element and the outer layer all at once by the coextrusion method. Further, for example, a thermosetting resin produced by a reaction injection molding method such as norbornene-based resin or polyurethane resin has a shape-memory property in the molded outer layer, so that the inner diameter of the electric fusion joint can be easily worked in advance. It can be used by expanding the diameter.
【００１４】発熱体を上記結晶性ポリオレフィン、低結
晶性共重合体、及び「ケッチェンブラックＥＣ」を用い
て形成し、外層をノルボルネン系樹脂で形成した電気融
着継手では、発熱体中に導電性粒子が均一に分散してい
るので、発熱体の品質が安定しており通電中の温度のば
らつきが小さい。また、外層と発熱体の間に容易に層間
剥離を生じない強固な結合が形成され、さらに、ポリエ
チレン管等の接合において発熱体表面とポリエチレンと
が良好に融着する。In the electric fusion joint in which the heating element is formed by using the above crystalline polyolefin, the low crystalline copolymer, and "Ketjenblack EC", and the outer layer is formed by the norbornene resin, the heating element is electrically conductive. Since the conductive particles are uniformly dispersed, the quality of the heating element is stable and the temperature variation during energization is small. In addition, a strong bond is formed between the outer layer and the heating element so that delamination does not easily occur, and further, the surface of the heating element and the polyethylene are fused well in joining polyethylene pipes and the like.
【００１５】[0015]
【発明の実施の形態】本発明の好適な実施形態として、
（４）前記結晶性ポリオレフィン５０〜９５重量％、好
ましくは７０〜８０重量％及び前記共重合体５０〜５重
量％、好ましくは３０〜２０重量％からなる樹脂混合物
６５〜８５重量％、好ましくは７０〜８０重量％と、前
記導電性粒子３５〜１５重量％、好ましくは３０〜２０
重量％からなる上記（１）記載の発熱体、挙げることが
できる。DESCRIPTION OF THE PREFERRED EMBODIMENTS As a preferred embodiment of the present invention,
(4) A resin mixture (65 to 85% by weight, preferably 50 to 95% by weight, preferably 70 to 80% by weight of the crystalline polyolefin and 50 to 5% by weight, preferably 30 to 20% by weight) of the copolymer. 70 to 80% by weight and 35 to 15% by weight of the conductive particles, preferably 30 to 20%
The heating element described in (1) above, which is composed by weight, may be mentioned.
【００１６】実施形態（４）において、結晶性ポリオレ
フィンが上記割合よりも多く、前記共重合体が少ない
と、結晶性ポリオレフィンのみからなる従来技術による
発熱体からの改善効果が小さい。しかし、結晶性ポリオ
レフィンが上記割合よりも少ないと成形加工が困難にな
る。樹脂混合物が上記割合より多く、導電性粒子の割合
が少ないと、抵抗値が大きくなり過ぎて発熱し難くな
り、発熱体としては不適当である。逆に、導電性粒子が
上記割合よりも多いと、抵抗値が小さくなり過ぎて電流
が過大になるので、やはり発熱体としては不適当であ
る。In the embodiment (4), when the amount of the crystalline polyolefin is more than the above proportion and the amount of the copolymer is less, the effect of improving the heating element by the conventional technique consisting of the crystalline polyolefin is small. However, if the amount of the crystalline polyolefin is less than the above proportion, the molding process becomes difficult. If the amount of the resin mixture is higher than the above ratio and the ratio of the conductive particles is low, the resistance value becomes too large and it is difficult to generate heat, which is unsuitable as a heating element. On the other hand, if the conductive particles are more than the above-mentioned ratio, the resistance value becomes too small and the current becomes excessive, which is also unsuitable as a heating element.
【００１７】[0017]
【実施例】以下において、本発明の一実施例及びこれに
対する比較例について説明する。EXAMPLES One example of the present invention and a comparative example will be described below.
【００１８】図１（Ａ）は、本発明の一実施例に係る電
気融着継手（参照符号１０）の構造を示す一部断面を含
む側面図である。図１において、参照符号１は継手１０
の最内層を構成する内層シート、２は内層シート４の上
に配置されるリング状電極、２１はリング状電極２から
外部へ引き出されるリード線、３は円筒状発熱体とその
周囲に設けた外層からなる継手本体、３１は継手本体３
の内層をなす発熱体、３２は発熱体３１の周囲に設けた
外層、３３は外層３２の表面に設けた端子部を示す。ま
た、図１（Ｂ）にリング状電極２とリード線２１の関係
を示す。FIG. 1A is a side view including a partial cross section showing the structure of an electric fusion joint (reference numeral 10) according to an embodiment of the present invention. In FIG. 1, reference numeral 1 indicates a joint 10.
Inner layer sheet constituting the innermost layer, 2 is a ring-shaped electrode arranged on the inner layer sheet 4, 21 is a lead wire drawn out from the ring-shaped electrode 2 to the outside, and 3 is a cylindrical heating element and its surroundings Outer layer joint body 31, 31 is joint body 3
In the figure, 32 is a heating element forming an inner layer, 32 is an outer layer provided around the heating element 31, and 33 is a terminal portion provided on the surface of the outer layer 32. 1B shows the relationship between the ring-shaped electrode 2 and the lead wire 21.
【００１９】上記電気融着継手１０の内層シート１は厚
さ０．１ｍｍのポリエチレンシートからなり、これをヒ
ートシールにより直径約１２３ｍｍ、長さ１２０ｍｍの
円筒状にした。リング状電極２は厚さ０．２ｍｍの銅板
からなり、これを幅５ｍｍの短冊状に切り、両端開放の
まま直径約１２４ｍｍのリング状に丸めた。リード線２
１を通すために、上記短冊の幅内に０．７ｍｍ程度の孔
をあけた。リード線２１は、直径約５ｍｍの円板の中央
に、太さ０．５ｍｍ、長さ約１０ｍｍの銅線の一端を垂
直に溶着して作成した。The inner layer sheet 1 of the electric fusion-bonding joint 10 was made of a polyethylene sheet having a thickness of 0.1 mm, which was heat-sealed into a cylindrical shape having a diameter of about 123 mm and a length of 120 mm. The ring-shaped electrode 2 is made of a copper plate having a thickness of 0.2 mm, cut into a strip having a width of 5 mm, and rounded into a ring having a diameter of about 124 mm while leaving both ends open. Lead wire 2
A hole of about 0.7 mm was opened in the width of the strip for passing 1. The lead wire 21 was prepared by vertically welding one end of a copper wire having a thickness of 0.5 mm and a length of about 10 mm to the center of a disk having a diameter of about 5 mm.
【００２０】継手本体３は、熱可塑性樹脂に導電性粒子
を混練してなる円筒状発熱体３１と発熱体３１の外面に
密着して設けた形状記憶性樹脂からなる外層３２とを有
し、内径１２５ｍｍ、厚さ８ｍｍ、長さ１２０ｍｍの円
筒状に予め形成されたものを用いた。The joint body 3 has a cylindrical heating element 31 made by kneading conductive particles in a thermoplastic resin, and an outer layer 32 made of a shape memory resin provided in close contact with the outer surface of the heating element 31. A pre-formed cylinder having an inner diameter of 125 mm, a thickness of 8 mm and a length of 120 mm was used.
【００２１】継手本体３の作成に当たっては、先ず、結
晶性ポリオレフィンとしてリニア低密度ポリエチレン
（住友化学（株）製「スミカセンＦＺ１０３−０」、結
晶化度５５〜６５％程度）７７重量部と、上記低結晶性
共重合体としてエチレン・α−オレフィン共重合体（三
井石油化学（株）製「タフマーＡ１０８５」、結晶化度
２０〜４０％程度）２３重量部を混合し、この樹脂混合
物７７重量部に対してカーボンブラック（ケッチェンブ
ラック・インターナショナル社製「ケッチェンブラック
ＥＣ」）２３重量部を配合し、円筒状の発熱体３１を作
成した。次に、上記発熱体を金型中に配置し、公知のノ
ルボルネン系モノマーの反応射出成形法により発熱体の
周囲にノルボルネン系樹脂からなる外層３２を形成し、
継手本体３を作成した。In producing the joint body 3, first, 77 parts by weight of linear low-density polyethylene (“Sumikasen FZ103-0” manufactured by Sumitomo Chemical Co., Ltd., crystallinity: about 55 to 65%) as crystalline polyolefin, and As a low crystallinity copolymer, 23 parts by weight of an ethylene / α-olefin copolymer (“Toughmer A1085” manufactured by Mitsui Petrochemical Co., Ltd., crystallinity: about 20 to 40%) was mixed, and 77 parts by weight of this resin mixture was mixed. Then, 23 parts by weight of carbon black (“Ketjen Black EC” manufactured by Ketjen Black International Co., Ltd.) was mixed to prepare a cylindrical heating element 31. Next, the heating element is placed in a mold, and an outer layer 32 made of norbornene-based resin is formed around the heating element by a known reaction injection molding method of norbornene-based monomer.
The joint body 3 was created.
【００２２】この継手本体３の表面には、同一母線上の
両端から夫々１０ｍｍの位置に予め端子部３３が設けら
れており、端子部３３の中心を通り、継手本体３の肉厚
を半径方向に貫通してリード線を通す孔が明けられてい
る。継手本体３のリード線用孔と、リング状電極２のリ
ード線用孔とを重ね合わせるようにしてリング状電極２
を継手本体３の内部に嵌め込み、前記孔にリード線２１
を通し、継手本体３、リング状電極２及びリード線２１
からなる仮アセンブリ体を準備した。On the surface of the joint body 3, terminal portions 33 are preliminarily provided at positions of 10 mm from both ends on the same generatrix, respectively, and pass through the center of the terminal portion 33, and the thickness of the joint body 3 is set in the radial direction. A hole is opened to penetrate the lead wire. The ring-shaped electrode 2 is formed by superimposing the lead-wire hole of the joint body 3 and the lead-wire hole of the ring-shaped electrode 2 on each other.
To the inside of the joint body 3 and insert the lead wire 21 into the hole.
Through the joint body 3, the ring-shaped electrode 2 and the lead wire 21.
Was prepared.
【００２３】上記において準備した各部を図２（Ａ）に
示す電気融着継手組立用器具（参照符号１００）を用い
て組立て、電気融着継手１０を作成した。図２（Ｂ）は
器具１００中の１個のＬ字状ブロックを示す斜視図であ
る。The respective parts prepared as described above were assembled using an electric fusion joint assembling tool (reference numeral 100) shown in FIG. 2 (A) to prepare an electric fusion joint 10. FIG. 2B is a perspective view showing one L-shaped block in the device 100.
【００２４】図２（Ａ）において、参照符号１０１はＬ
字状ブロック、１２０はＬ字状ブロック１０１から復元
される鍔付円筒体、１２１は鍔付円筒体１２０の円筒部
分、１２２は鍔付円筒体１２０の内孔、１０２は拡径の
ため鍔付円筒体１２０の内孔１２２中に押し込まれるラ
ム、１０３は鍔付円筒体１２０を支持するベースプレー
ト、１０４は押え板（点線で表示）、１０５はベースプ
レート１０３に設けた放射状の溝、１０６はベースプレ
ート１０３中央に設けた中央孔を示す。また図２（Ｂ）
において、参照符号１１１はＬ字状ブロック１０１の垂
直部、１１２は同水平部、１１３は垂直部１１１の外部
表面に取付けた面状ヒーターを示す。In FIG. 2A, reference numeral 101 is L.
Block 120 is a cylindrical body with a collar restored from the L-shaped block 101, 121 is a cylindrical portion of the cylindrical body 120 with a collar, 122 is an inner hole of the cylindrical body 120 with a collar, and 102 is a collar for expanding the diameter. A ram is pushed into the inner hole 122 of the cylindrical body 120, 103 is a base plate that supports the flanged cylindrical body 120, 104 is a holding plate (indicated by a dotted line), 105 is a radial groove provided in the base plate 103, and 106 is the base plate 103. The central hole provided in the center is shown. FIG. 2 (B)
In the figure, reference numeral 111 is a vertical portion of the L-shaped block 101, 112 is the same horizontal portion, and 113 is a planar heater attached to the outer surface of the vertical portion 111.
【００２５】器具１００は内径１２５ｍｍの継手の組立
用に設計され、既存のプレス機を利用してラムの押し込
みを行うものである。この器具１００中の鍔付円筒体１
２０は１８個のＬ字状ブロック１０１から構成され、鍔
付円筒体１２０の円筒部分１２１の拡径前の外径は１２
３ｍｍ、長さは１３０ｍｍである。鍔付円筒体１２０の
内孔１２２は上端部における拡径前の内径が９３ｍｍ
で、下方に向かって狭くなるように１／１９．２のテー
パー斜度を与えられている。この内孔１２２に挿入され
るラム１０２は内孔１２２と同一のテーパー斜度を有
し、上部直径が１０６ｍｍ、下部直径が８６ｍｍ、長さ
１９２ｍｍの裁頭円錐体をなす。ベースプレート１０３
は厚さ４１ｍｍ、３００ｍｍ角の方形をなす。なおこれ
らは全てステンレス鋼（Ｓ５０Ｃ）製である。The instrument 100 is designed for assembling a joint having an inner diameter of 125 mm and uses an existing press machine to push the ram. The collared cylinder 1 in this device 100
20 is composed of 18 L-shaped blocks 101, and the outer diameter of the cylindrical portion 121 of the flanged cylindrical body 120 before expansion is 12
The length is 3 mm and the length is 130 mm. The inner hole 122 of the flanged cylindrical body 120 has an inner diameter of 93 mm at the upper end before expansion.
Thus, a taper gradient of 1 / 19.2 is given so as to narrow downward. The ram 102 inserted into the inner hole 122 has the same taper slope as the inner hole 122, and forms a truncated cone having an upper diameter of 106 mm, a lower diameter of 86 mm, and a length of 192 mm. Base plate 103
Has a rectangular shape with a thickness of 41 mm and a square of 300 mm. All of these are made of stainless steel (S50C).
【００２６】図２（Ｂ）に示すＬ字状ブロック１０１の
垂直部１１１の外面には面状ヒーター１１３［坂口電熱
社製「シリコンラバー・ヒーター」］が取り付けられて
いる。このヒーターは、内層シート１及びリング状電極
２を発熱体３１の内面に融着する目的で設けたものであ
る。On the outer surface of the vertical portion 111 of the L-shaped block 101 shown in FIG. 2 (B), a planar heater 113 ["Silicon rubber heater" manufactured by Sakaguchi Dentsu Co., Ltd.] is attached. This heater is provided for the purpose of fusing the inner layer sheet 1 and the ring-shaped electrode 2 to the inner surface of the heating element 31.
【００２７】図２（Ｂ）に示すように、Ｌ字状ブロック
１０１の水平部１１２の先端（鍔の外周に向く部分）は
その中心線に沿って両側面が平行に仕上げられている。
一方、図２（Ａ）に示すように、ベースプレート１０３
には溝１０５が放射状に設けられており、上記の水平部
１１２の先端はこれらの溝１０５に嵌め込まれ、かつ押
え板１０４により押さえられる。かくして、各Ｌ字状ブ
ロック１０１がラム１０２の挿入により外周方向へ駆動
される際、これらが溝１０５に沿って放射状に移動し、
各Ｌ字状ブロック１０１は互いに均等な間隔を保ちつつ
離間する。また、ベースプレート１０３の中央には、ラ
ム１０２の先端よりも大きい直径を有する中央孔１０６
が設けられており、鍔付円筒体１２０の底面位置を越え
てラム１０２の先端を押し込むことができる。As shown in FIG. 2B, both ends of the end of the horizontal portion 112 of the L-shaped block 101 (the portion facing the outer periphery of the collar) are finished parallel to each other along the center line.
On the other hand, as shown in FIG.
Grooves 105 are radially provided in the groove, and the tips of the horizontal portions 112 are fitted into the grooves 105 and are pressed by the holding plate 104. Thus, when each L-shaped block 101 is driven in the outer peripheral direction by the insertion of the ram 102, they move radially along the groove 105,
The L-shaped blocks 101 are separated from each other while maintaining an equal interval. Further, in the center of the base plate 103, a central hole 106 having a diameter larger than that of the tip of the ram 102.
Is provided, and the tip of the ram 102 can be pushed over the bottom surface position of the collared cylindrical body 120.
【００２８】図３は、器具１００を用いて電気融着継手
を組立てる方法を説明するための縦断面図である。同図
では内層シート１、リング状電極２、継手本体３の厚さ
及び直径は理解容易のため誇張されている。図３に示す
ように、鍔付円筒体１２０の円筒部分１２１に内層シー
ト１を嵌め、さらにその上から上記仮アセンブリ体を取
り付けた。しかる後、鍔付円筒体１２０の内孔１２２に
ラム１０２を挿入した器具１００をプレス機にセットし
て、鍔付円筒体１２０の直径を約１０秒間で２．３％拡
径した。この状態でヒーター１１３に通電したところ約
１分間後にヒーター１１３付近の温度が約２８０℃に達
し、リング状電極２及び内層シート１が継手本体３の内
面に融着された。以上の工程を経て、本実施例に係る電
気融着継手１０を作成した。FIG. 3 is a vertical sectional view for explaining a method of assembling an electric fusion joint using the instrument 100. In the figure, the thickness and diameter of the inner layer sheet 1, the ring-shaped electrode 2, and the joint body 3 are exaggerated for easy understanding. As shown in FIG. 3, the inner layer sheet 1 was fitted into the cylindrical portion 121 of the flanged cylindrical body 120, and the temporary assembly was attached from above. After that, the tool 100 having the ram 102 inserted into the inner hole 122 of the collared cylindrical body 120 was set in a press, and the diameter of the collared cylindrical body 120 was expanded by 2.3% in about 10 seconds. When the heater 113 was energized in this state, the temperature around the heater 113 reached about 280 ° C. after about 1 minute, and the ring-shaped electrode 2 and the inner layer sheet 1 were fused to the inner surface of the joint body 3. Through the above steps, the electric fusion splicing joint 10 according to this example was created.
【００２９】上記において作成した５個の電気融着継手
１０について、各点の温度及びそのバラツキを測定し
た。温度計測点は、各電気融着継手１０の外筒部３２の
一端から２０ｍｍの位置にある円周上に等間隔で８点を
選んだ。温度計測方法は熱電対によった。これらの温度
計測結果を表１に示す。表１において「平均温度」は上
記８点の計測点における温度の平均値、「△Ｔ（バラツ
キ）」は、上記８点の計測点における温度の最大値と最
小値の差を表す。With respect to the five electric fusion-bonded joints 10 prepared as described above, the temperature at each point and its variation were measured. Eight temperature measurement points were selected at equal intervals on the circumference at a position 20 mm from one end of the outer tubular portion 32 of each electric fusion joint 10. The temperature was measured by a thermocouple. The results of these temperature measurements are shown in Table 1. In Table 1, “average temperature” represents the average value of the temperatures at the eight measurement points, and “ΔT (variation)” represents the difference between the maximum value and the minimum value of the temperature at the eight measurement points.
【表１】 [Table 1]
【００３０】また、ピール試験器を用いて５０個の未使
用の電気融着継手１０について、発熱体と外層を引剥し
て破壊する試験を行った。引剥しは１０ｍｍ／ｍｉｎの
速度で行った。その結果、５０個の試料の全てが発熱体
層中で破壊され、発熱体と外層の剥離は認められなかっ
た。Further, using a peel tester, 50 unused electric fusion-bonded joints 10 were subjected to a test of peeling and breaking the heating element and the outer layer. Peeling was performed at a speed of 10 mm / min. As a result, all of the 50 samples were destroyed in the heating element layer, and no peeling between the heating element and the outer layer was observed.
【００３１】比較対照のため、本実施例における低結晶
性共重合体の配合量を零にし、リニア低密度ポリエチレ
ン（スミカセンＦＺ１０３−０）７７重量部に対してカ
ーボンブラック（ケッチェンブラックＥＣ）２３重量部
を配合して発熱体を形成した。上記と同様にして発熱体
の周囲にポリノルボルネン系樹脂からなる外層を形成し
て継手本体を作成し、この継手本体を用いる以外は本実
施例と同様の構成の電気融着継手を作成した。For comparison, the compounding amount of the low crystalline copolymer in this example was set to zero, and carbon black (Ketjen Black EC) 23 was added to 77 parts by weight of linear low density polyethylene (Sumikasen FZ103-0). Parts by weight were compounded to form a heating element. In the same manner as above, an outer layer made of polynorbornene-based resin was formed around the heating element to form a joint body, and an electric fusion joint having the same configuration as that of this example was prepared except that this joint body was used.
【００３２】比較対照のため従来技術により作成した上
記電気融着継手（比較例）５個について上記と同様な温
度計測を行ない、その結果を表２に掲げた。表２におけ
る「平均温度」、「△Ｔ（バラツキ）」の意味は上記と
同様である。For the purpose of comparison and comparison, the same temperature measurement as above was carried out for the above-mentioned five electric fusion-bonded joints (comparative example) prepared by the prior art, and the results are shown in Table 2. The meanings of “average temperature” and “ΔT (variation)” in Table 2 are the same as above.
【表２】 [Table 2]
【００３３】また、比較例としての電気融着継手５０個
について上記同様の剥離試験を実施したところ、５０個
中８個で発熱体と外層の界面で剥離が認められた。Further, when a peeling test similar to the above was carried out on 50 pieces of the electric fusion joints as comparative examples, peeling was observed at the interface between the heating element and the outer layer in 8 of the 50 pieces.
【００３４】本実施例及び比較例における平均温度の個
体間の差は表１では２３９〜２４３℃であるのに対し
て、表２では２４０〜２４６℃である。また△Ｔの個体
間の差は表１では１１〜１６℃であるのに対して、表２
では１６〜２０℃である。ここから本実施例に係る電気
融着継手１０では比較例に較べて平均温度の個体間の差
が小さく、また、同一個体内における温度のバラツキも
小さいことが分かる。The difference between the individual average temperatures in the present example and the comparative example is 239 to 243 ° C. in Table 1, whereas it is 240 to 246 ° C. in Table 2. Further, the difference between the individuals of ΔT is 11 to 16 ° C. in Table 1, while that in Table 2
Is 16 to 20 ° C. From this, it can be seen that in the electric fusion splicing joint 10 according to the present embodiment, the difference in average temperature between the individuals is smaller than that in the comparative example, and the variation in temperature within the same individual is also small.
【００３５】[0035]
【発明の効果】本発明に係る発熱体と、ノルボルネン系
樹脂等の形状記憶性樹脂からなる外層とを有する本発明
に係る電気融着継手では、発熱体中における導電性粒子
の均一分散が容易に実現され、発熱体の品質が安定して
いるので通電中の温度のばらつきが小さい。また、外層
と発熱体の間に容易に層間剥離を生じない強固な結合が
形成され、さらに、ポリエチレン管等の接合における発
熱体表面とポリエチレン管との融着も良好である。EFFECT OF THE INVENTION In the electrofusion joint according to the present invention having the heating element according to the present invention and the outer layer made of a shape memory resin such as norbornene resin, it is easy to uniformly disperse the conductive particles in the heating element. Since the quality of the heating element is stable, there is little variation in temperature during energization. In addition, a strong bond is formed between the outer layer and the heating element so that delamination does not occur easily, and the fusion between the surface of the heating element and the polyethylene tube is also good in the case of joining a polyethylene tube or the like.
【００３６】[0036]
【図１】図１（Ａ）は本発明の一実施例に係る電気融着
継手の構造を示す一部断面を含む側面図、図１（Ｂ）は
リング状電極及びリード線を示す斜視図である。FIG. 1 (A) is a side view including a partial cross-section showing a structure of an electric fusion joint according to an embodiment of the present invention, and FIG. 1 (B) is a perspective view showing a ring-shaped electrode and a lead wire. Is.
【図２】図２（Ａ）は図１（Ａ）に示す電気融着継手の
組立に使用する器具を示す一部断面を含む斜視図、図２
（Ｂ）は上記器具中のＬ字状ブロックを示す斜視図であ
る。2 (A) is a perspective view including a partial cross-section showing an instrument used for assembling the electric fusion joint shown in FIG. 1 (A), FIG.
(B) is a perspective view showing an L-shaped block in the device.
【図３】図２に示す器具を用いる電気融着継手の組立方
法を説明する縦断面図である。FIG. 3 is a vertical sectional view for explaining a method for assembling an electric fusion joint using the device shown in FIG.
１…内層シート ２…リング状電極 ２１…リード線 ３…継手本体 ３１…発熱体 ３２…外筒部
３３…端子部 １０…電気融着継手 １００…電気融着継手組立用器具 １０１…Ｌ字状ブロック １０２…ラム １０
３…ベースプレート １０４…押え板 １０５…放射状の溝 １０
６…中央孔 １１１…Ｌ字状ブロックの垂直部 １１２…Ｌ字
状ブロックの水平部 １１３…ヒーター １２０…鍔付円筒体 １２１…鍔付円筒体の円筒部
分 １２２…鍔付円筒体の内孔DESCRIPTION OF SYMBOLS 1 ... Inner layer sheet 2 ... Ring electrode 21 ... Lead wire 3 ... Joint body 31 ... Heating element 32 ... Outer cylinder part
33 ... Terminal part 10 ... Electrical fusion joint 100 ... Electrical fusion joint assembly instrument 101 ... L-shaped block 102 ... Lamb 10
3 ... Base plate 104 ... Holding plate 105 ... Radial groove 10
6 ... Central hole 111 ... Vertical part of L-shaped block 112 ... Horizontal part of L-shaped block 113 ... Heater 120 ... Cylindrical body with flange 121 ... Cylindrical part of flanged cylinder 122 ... Inner hole of flanged cylinder
Claims (3)
のα−オレフィンと他のα−オレフィンとの低結晶性共
重合体と、導電性粒子からなる電気融着継手用発熱体。1. A crystalline polyolefin and 2 or 3 carbon atoms.
A heating element for an electric fusion joint, which comprises a low crystalline copolymer of α-olefin with another α-olefin and conductive particles.
載の発熱体からなる電気融着継手。2. An electric fusion joint comprising an outer layer and an inner layer, the inner layer comprising the heating element according to claim 1.
求項２記載の電気融着継手。3. The electric fusion joint according to claim 2, wherein the outer layer is made of norbornene-based resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11053396A JPH09280470A (en) | 1996-04-08 | 1996-04-08 | Heating element for electric welding coupling and electrically welded coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11053396A JPH09280470A (en) | 1996-04-08 | 1996-04-08 | Heating element for electric welding coupling and electrically welded coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09280470A true JPH09280470A (en) | 1997-10-31 |
Family
ID=14538230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11053396A Pending JPH09280470A (en) | 1996-04-08 | 1996-04-08 | Heating element for electric welding coupling and electrically welded coupling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09280470A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006212824A (en) * | 2005-02-01 | 2006-08-17 | Toyota Boshoku Corp | Molded structure |
-
1996
- 1996-04-08 JP JP11053396A patent/JPH09280470A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006212824A (en) * | 2005-02-01 | 2006-08-17 | Toyota Boshoku Corp | Molded structure |
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