JP2545972B2 - Electrofusion fittings - Google Patents
Electrofusion fittingsInfo
- Publication number
- JP2545972B2 JP2545972B2 JP1072335A JP7233589A JP2545972B2 JP 2545972 B2 JP2545972 B2 JP 2545972B2 JP 1072335 A JP1072335 A JP 1072335A JP 7233589 A JP7233589 A JP 7233589A JP 2545972 B2 JP2545972 B2 JP 2545972B2
- Authority
- JP
- Japan
- Prior art keywords
- joined
- resin layer
- crosslinked polyolefin
- layer
- 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.)
- Expired - Lifetime
Links
- 229920005989 resin Polymers 0.000 claims description 41
- 239000011347 resin Substances 0.000 claims description 41
- 238000010438 heat treatment Methods 0.000 claims description 21
- 229920005992 thermoplastic resin Polymers 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 229920000098 polyolefin Polymers 0.000 description 53
- 238000007789 sealing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004711 α-olefin Substances 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
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"
- B29C65/3404—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" characterised by the type of heated elements which remain in the joint
- B29C65/342—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" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
-
- 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
- B29C66/347—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients
- B29C66/3472—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients in the plane of the joint, e.g. along the joint line in the plane of the joint or perpendicular to the joint line in the plane of the joint
-
- 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
- B29C66/72—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 structure of the material of the parts to be joined
- B29C66/723—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 structure of the material of the parts to be joined being multi-layered
-
- 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
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
-
- 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
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
- B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
-
- 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"
- B29C65/3472—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" characterised by the composition of the heated elements which remain in the joint
- B29C65/3476—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" characterised by the composition of the heated elements which remain in the joint being metallic
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明はポリオレフィンパイプ等の被接合体、特に
温水用の導管を接合するためのエレクトロフュージョン
継手に関するものである。Description: TECHNICAL FIELD The present invention relates to an electrofusion joint for joining an article to be joined such as a polyolefin pipe, particularly a conduit for hot water.
従来、給水、給湯あるいはガス用等の導管として用い
る樹脂製パイプ等の被接合体を接合するエレクトロフュ
ージョン継手として、第３図に示すようなものが公知で
ある（例えば、特開昭61−130695号、特公昭63−40993
号）。BACKGROUND ART Conventionally, as shown in FIG. 3, an electrofusion joint for joining objects to be joined such as a resin pipe used as a conduit for water supply, hot water supply or gas supply is known (for example, Japanese Patent Laid-Open No. 61-130695). No. 63-40993
issue).
図において、１はエレクトロフュージョン継手で、継
手本体を形成する熱可塑性樹脂製の管状の樹脂層２と、
樹脂層２の内部に埋設されたコイル状の電熱線３とから
なる。この電熱線３は樹脂製パイプ等の被接合体４、５
が挿入される接合部６に配置されている。In the figure, reference numeral 1 denotes an electrofusion joint, which is a tubular resin layer 2 made of a thermoplastic resin that forms a joint body,
The coil-shaped heating wire 3 is embedded inside the resin layer 2. The heating wire 3 is a member to be joined 4, 5 such as a resin pipe.
Is arranged at the joint portion 6 into which is inserted.
このようなエレクトロフュージョン継手１は、樹脂層
２に接合しようとする被接合体４、５を挿入して、その
突合せ部７付近を覆い、電熱線３に通電すると、熱可塑
性樹脂からなる樹脂層２が溶融して被接合体４、５と一
体的に融着する。それにより被接合体４、５を接合する
ことができる。In such an electrofusion joint 1, when the objects to be joined 4 and 5 to be joined to the resin layer 2 are inserted and the vicinity of the butted portion 7 is covered and the heating wire 3 is energized, a resin layer made of a thermoplastic resin is formed. 2 is melted and integrally fused with the objects to be joined 4, 5. Thereby, the objects to be joined 4, 5 can be joined.
しかしながら、このような従来のエレクトロフュージ
ョン継手１は、樹脂層２に埋設されたコイル状の電熱線
３の形状およびピッチが均一に形成されているため、電
熱線３に通電すると溶融樹脂の温度分布が不均一にな
り、電熱線３の中心部付近ほど高温になって、両端部付
近は中心部付近に比べて温度が低くなり、場合によって
は溶融しないなど、溶融のむらが発生する。そのため被
接合体４、５と樹脂層２との融着力にむらが生じ、使用
中の耐圧性、シール性などが低下し、長期的な性能低下
の原因となるなどの問題点があった。However, in such a conventional electrofusion joint 1, since the shape and pitch of the coil-shaped heating wire 3 embedded in the resin layer 2 are formed uniformly, the temperature distribution of the molten resin when the heating wire 3 is energized Becomes non-uniform, the temperature becomes higher near the center of the heating wire 3, and the temperature near both ends becomes lower than that near the center, and in some cases uneven melting occurs such as not melting. Therefore, there is a problem in that the fusion force between the objects to be joined 4 and 5 and the resin layer 2 becomes uneven, and the pressure resistance during use, the sealing property, etc. are reduced, causing a long-term deterioration in performance.
本発明の目的は、上記問題点を解決するため、融着時
の樹脂層の温度分布を均一にして、むらのない均一な融
着を行うことができ、耐圧性、シール性などの性能を長
期にわたって高く維持できるエレクトロフュージョン継
手を提供することである。The object of the present invention is to solve the above problems, to make the temperature distribution of the resin layer at the time of fusion uniform, and to perform uniform fusion without unevenness, and to improve performance such as pressure resistance and sealability. An object of the present invention is to provide an electrofusion joint that can be maintained at a high level for a long period of time.
本発明は、被接合体の外周部に接するように形成され
た熱可塑性樹脂からなる樹脂層と、この樹脂層に設けら
れた電熱線とを備え、この電熱線は前記樹脂層の内径部
からの距離が樹脂層の中央部で大きく、かつ両端部で小
さくなるような位置に配置されたことを特徴とするエレ
クトロフュージョン継手である。The present invention comprises a resin layer made of a thermoplastic resin formed so as to be in contact with the outer peripheral portion of the article to be joined, and a heating wire provided in the resin layer, the heating wire being from an inner diameter portion of the resin layer. Is arranged at such a position that the distance is large at the center of the resin layer and small at both ends.
本発明において、熱可塑性樹脂からなる樹脂層は継手
の全体を構成するものであってもよく、またその一部を
構成するものであってもよい。例えば、上記樹脂層は接
合しようとする両方の被接合体と接する部分に形成して
もよいが、一方の被接合体と接する部分にのみ形成し、
他方の被接合体とは、ねじ等の機械的接合手段を有する
他の接合部材により接合してもよい。また上記樹脂層は
被接合体と接する内周部のみに形成し、外周部には強度
を有する他の樹脂層を積層してもよい。上記樹脂層と被
接合体は同種の樹脂または互いに相溶性を有する樹脂か
らなるものが好ましい。In the present invention, the resin layer made of a thermoplastic resin may form the whole joint, or may form a part thereof. For example, the resin layer may be formed in a portion in contact with both of the joined objects to be joined, but formed only in a portion in contact with one of the joined objects,
The other member to be joined may be joined by another joining member having mechanical joining means such as a screw. Further, the resin layer may be formed only on the inner peripheral portion in contact with the object to be bonded, and another resin layer having strength may be laminated on the outer peripheral portion. The resin layer and the article to be joined are preferably made of the same type of resin or a resin having compatibility with each other.
本発明のエレクトロフュージョン継手は、熱可塑性樹
脂からなる樹脂層の内側に被接合体を挿入し、その樹脂
層に設けられている電熱線に通電して樹脂層を溶融する
と、電熱線が樹脂層の内径部からの距離が樹脂層の中央
部で大きく、かつ両端部で小さくなるような位置に配置
されているため、被接合体と接する樹脂層の内径部に供
給される熱量は、外部の低温雰囲気の影響が大きい両端
部付近ほど多く、中央部ほど少なくなって、接合部の樹
脂層の温度分布が均一なる。The electrofusion joint of the present invention, when the object to be joined is inserted inside the resin layer made of a thermoplastic resin and the heating wire provided in the resin layer is energized to melt the resin layer, the heating wire causes the resin layer to Since the distance from the inner diameter portion of the resin layer is large in the central portion of the resin layer and small in both end portions, the amount of heat supplied to the inner diameter portion of the resin layer in contact with the article is The influence of the low temperature atmosphere is large near both ends, and is small near the center, and the temperature distribution of the resin layer at the joint is uniform.
その結果樹脂層がむらなく均一に溶融し、接合部の樹
脂層の全体が被接合体とむらなく均一に融着して、被接
合体を接合する。これにより耐圧性、シール性などが高
い状態で維持される。As a result, the resin layer is evenly and evenly melted, and the entire resin layer of the joint portion is evenly and evenly fused to the body to be joined, so that the body to be joined is joined. As a result, the pressure resistance and sealing performance are maintained in a high level.
以下、本発明の実施例を図面により説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図は別の実施例のエレクトロフュージョン継手の
右半分を断面で示す正面図であり、左右対称に構成され
ている。図において、１はエレクトロフュージョン継手
で、継手本体を形成する管状の架橋ポリオレフィン層2a
と、この架橋ポリオレフィン層2aの内側の被接合体４、
５に接する接合部に、架橋ポリオレフィン層2aと一体的
に形成された熱可塑性樹脂層としての非架橋ポリオレフ
ィン層2bと、この非架橋ポリオレフィン層2bの内部にコ
イル状に設けられた電熱線３とを有する。またこの電熱
線３は、非架橋ポリオレフィン層2bの内径部からの距離
が樹脂層の中央部で大きく、かつ両端部で小さくなるよ
うな位置に配置されている。非架橋ポリオレフィン層2b
は左右の接合部６の被接合体４、５の外周に接するよう
に管状に形成されている。FIG. 1 is a front view showing in cross section the right half of an electrofusion joint of another embodiment, which is symmetrically configured. In the figure, 1 is an electrofusion joint, which is a tubular cross-linked polyolefin layer 2a forming the joint body.
And the article to be joined 4 inside the crosslinked polyolefin layer 2a,
5, a non-crosslinked polyolefin layer 2b as a thermoplastic resin layer integrally formed with the crosslinked polyolefin layer 2a, and a heating wire 3 provided in the inside of the noncrosslinked polyolefin layer 2b in a coil shape. Have. Further, the heating wire 3 is arranged in such a position that the distance from the inner diameter portion of the non-crosslinked polyolefin layer 2b is large at the central portion of the resin layer and small at both end portions. Non-crosslinked polyolefin layer 2b
Is formed in a tubular shape so as to come into contact with the outer peripheries of the objects to be joined 4 and 5 of the left and right joints 6.
被接合体４、５はポリエチレン等の熱可塑性樹脂層を
有する管からなり、全体が融着性の熱可塑性樹脂からな
るものでもよいが、架橋ポリオレフィン等の耐熱性材料
を用いる場合は、外表面を融着性の熱可塑性樹脂で被覆
したものを用いる。The objects to be joined 4 and 5 are made of a tube having a thermoplastic resin layer such as polyethylene, and may be entirely made of a fusible thermoplastic resin. However, when a heat resistant material such as crosslinked polyolefin is used, the outer surface What is coated with a fusible thermoplastic resin is used.
架橋ポリオレフィン層2aは被接合体４、５の突合せ部
７付近を全周にわたって覆う管状の構造であり、その長
手方向の両側の各被接合体４、５に対応する接合部６の
内周に被架橋ポリオレフィン層2bが積層され、その中に
電熱線３が設けられている。The crosslinked polyolefin layer 2a has a tubular structure that covers the vicinity of the abutting portions 7 of the objects to be joined 4, 5 over the entire circumference thereof, and is provided on the inner circumference of the joining portion 6 corresponding to the objects to be joined 4, 5 on both sides in the longitudinal direction. The crosslinked polyolefin layer 2b is laminated, and the heating wire 3 is provided therein.
上記のエレクトロフュージョン継手１は、架橋ポリオ
レフィン層と非架橋ポリオレフィン層とが隣接して一体
化して形成されている。架橋ポリオレフィンは融着性を
有しないため、架橋後の架橋ポリオレフィンと非架橋ポ
リオレフィンを押出成形、射出成形等により成形して
も、それぞれの層は分離して一体化しないが、未架橋の
架橋性ポリオレフィンと非架橋ポリオレフィンとを加熱
成形して一体化し、その後架橋性ポリオレフィンを架橋
させると、架橋ポリオレフィンと非架橋ポリオレフィン
が一体化した積層体が得られる。The electrofusion joint 1 is formed by adjoining and integrally forming a crosslinked polyolefin layer and a non-crosslinked polyolefin layer. Since the crosslinked polyolefin has no fusibility, even if the crosslinked polyolefin and the non-crosslinked polyolefin are molded by extrusion molding, injection molding, etc., the respective layers are not separated and integrated, but the uncrosslinked crosslinkable polyolefin is not crosslinked. When the polyolefin and the non-crosslinked polyolefin are heat-molded and integrated, and then the crosslinkable polyolefin is crosslinked, a laminate in which the crosslinked polyolefin and the non-crosslinked polyolefin are integrated is obtained.
架橋ポリオレフィンは、ポリオレフィンの分子間架橋
により立体構造となったものであり、シラン架橋ポリオ
レフィン、ジビニルベンゼン架橋ポリオレフィンなどの
架橋剤により架橋したもののほか、有機過酸化物、放射
線等により直接架橋したものでもよい。Crosslinked polyolefin has a three-dimensional structure due to intermolecular crosslinking of polyolefin, and may be crosslinked with a crosslinking agent such as silane crosslinked polyolefin or divinylbenzene crosslinked polyolefin, or may be directly crosslinked with organic peroxide, radiation or the like. Good.
非架橋ポリオレフィンは一般に熱可塑性樹脂として使
用されている架橋性を有しないポリオレフィン樹脂であ
る。Non-crosslinked polyolefin is a non-crosslinkable polyolefin resin generally used as a thermoplastic resin.
ポリオレフィンとしては、炭素数２〜20、好ましくは
２〜12のα−オレフィンの単独または共重合体があげら
れる。好ましいα−オレフィンとしては、エチレン、プ
ロピレン、ブテン−１、４−メチルペンテン−１などが
あげられる。Examples of the polyolefin include homo- or copolymers of α-olefin having 2 to 20 carbon atoms, preferably 2 to 12 carbon atoms. Preferred α-olefins include ethylene, propylene, butene-1, 4-methylpentene-1 and the like.
上記のエレクトロフュージョン継手１は、非架橋ポリ
オレフィン層2b中に電熱線３を埋設した状態で、ポリオ
レフィン中に架橋剤、架橋助剤等を含む架橋ポリオレフ
ィン層と積層一体化した後、上記架橋ポリオレフィン層
を架橋させて架橋ポリオレフィン層2aを形成することに
より製造される。The above electrofusion joint 1 is laminated with a crosslinked polyolefin layer containing a crosslinking agent, a crosslinking aid, etc. in the polyolefin in a state where the heating wire 3 is embedded in the non-crosslinked polyolefin layer 2b, and then the above crosslinked polyolefin layer. Is produced by cross-linking to form a cross-linked polyolefin layer 2a.
こうして製造されたエレクトロフュージョン継手１
は、ポリオレフィンチューブ等の被接合体４、５の突合
せ部７付近に、非架橋ポリオレフィン層2bが被接合体
４、５と接するように取付け、電熱線３に通電すると、
非架橋ポリオレフィン層2bが溶融して被接合体４、５に
融着して一体化する。Electrofusion joint 1 thus manufactured
Is attached near the abutting portion 7 of the joined bodies 4, 5 such as a polyolefin tube so that the non-crosslinked polyolefin layer 2b is in contact with the joined bodies 4, 5, and when the heating wire 3 is energized,
The non-crosslinked polyolefin layer 2b is melted and fused to the objects to be joined 4, 5 to be integrated.
電熱線３は、非架橋ポリオレフィン層2bの内径部から
の距離が非架橋ポリオレフィン層2bの中央部で大きく、
かつ両端部で小さくなるような位置に配置されているた
め、被接合体４、５と接する非架橋ポリオレフィン層2b
の内径部に供給される熱量は、外部と低温雰囲気の影響
が大きい両端部付近ほど多く、中央部ほど少なくなっ
て、接合部６の非架橋ポリオレフィン層2bの温度分布が
均一になる。The heating wire 3 has a large distance from the inner diameter portion of the non-crosslinked polyolefin layer 2b in the central portion of the non-crosslinked polyolefin layer 2b,
In addition, the non-crosslinked polyolefin layer 2b that is in contact with the objects to be joined 4 and 5 because it is arranged at positions that become smaller at both ends
The amount of heat supplied to the inner diameter portion of the non-crosslinked polyolefin layer 2b in the joint portion 6 becomes uniform, and the amount of heat supplied to the inner diameter portion of the joint portion 6 is large in the vicinity of both ends where the influence of the outside and the low temperature atmosphere is large and is small in the central portion.
その結果非架橋ポリオレフィン層2bの接合部６がむら
なく均一に溶融し、非架橋ポリオレフィン層2bの全体が
被接合体４、５とむらなく均一に融着して被接合体４、
５と接合する。As a result, the joint portion 6 of the non-crosslinked polyolefin layer 2b is evenly and uniformly melted, and the entire non-crosslinked polyolefin layer 2b is evenly and evenly fused to the objects to be joined 4, 5 to be joined 4,
Join with 5.
上記のエレクトロフュージョン継手１は、継手本体を
形成する管状の架橋ポリオレフィン層2aが耐熱強度を負
担するので、給湯管等の接合に用いても形状保持性に優
れる。一方非架橋ポリオレフィン層2bが架橋ポリオレフ
ィン層2aと一体化した状態で、被接合体４、５に均一に
融着して一体化するため、シール性に優れている。これ
により耐圧性、シール性などが高い状態で維持される。In the electrofusion joint 1 described above, the tubular cross-linked polyolefin layer 2a forming the joint body bears the heat resistance strength, so that it is excellent in shape retention even when used for joining hot water supply pipes and the like. On the other hand, since the non-crosslinked polyolefin layer 2b and the crosslinked polyolefin layer 2a are integrated with each other, they are uniformly fused and integrated with the articles 4 and 5 to be joined, so that the sealability is excellent. As a result, the pressure resistance and sealing performance are maintained in a high level.
第２図は他の実施例の上半分を断面で示す正面図であ
る。この実施例では非架橋ポリオレフィン層2bは連続し
て一体的に設けられており、架橋ポリオレフィン層4a、
5aおよび非架橋ポリオレフィン層4b、5bからなる被接合
体４、５を接合するようになっている。FIG. 2 is a front view showing the upper half of another embodiment in cross section. In this embodiment, the non-crosslinked polyolefin layer 2b is continuously and integrally provided, and the crosslinked polyolefin layer 4a,
The objects to be joined 4, 5 composed of 5a and the non-crosslinked polyolefin layers 4b, 5b are joined together.
なお、上記の実施例は熱可塑性樹脂層としての非架橋
ポリオレフィン層2bは架橋ポリオレフィン層2aと積層し
た例を示したが、第２図のように非架橋ポリオレフィン
層2bのみからなる樹脂層２により継手１を形成してもよ
い。また継手１は左右対称となるように、両側に非架橋
ポリオレフィン層2bおよび電熱線３を設けた例を示した
が、片側例えば第１図の右側を図のように構成し、反対
側例えば左側にはねじ等の接続部を有する接続部材を取
付けて被接合体と機械的に接合するようにしてもよい。In the above example, the non-crosslinked polyolefin layer 2b as the thermoplastic resin layer is laminated with the crosslinked polyolefin layer 2a, but as shown in FIG. The joint 1 may be formed. Also, an example is shown in which the non-crosslinked polyolefin layer 2b and the heating wire 3 are provided on both sides so that the joint 1 is bilaterally symmetrical, but one side, for example, the right side of FIG. 1 is configured as shown, and the other side, for example, the left side. A connecting member having a connecting portion such as a screw may be attached to the to be mechanically joined to the article.
本発明によれば、樹脂層に、その内径部からの距離が
樹脂層の中央部で大きく、かつ両端部で小さくなるよう
な位置に配置される電熱線を設けたので、樹脂層の温度
分布を均一にして、全体を均一に融着させ、耐圧性、シ
ール性などの性能を長期にわたって維持できるエレクト
ロフュージョン継手が得られる。According to the present invention, the resin layer is provided with the heating wire arranged such that the distance from the inner diameter portion of the resin layer is large at the central portion of the resin layer and small at both ends thereof, so that the temperature distribution of the resin layer is Is obtained, and the whole is uniformly fused and the performances such as pressure resistance and sealing property can be maintained for a long period of time.
第１図および第２図は別の実施例の一部を断面で示す正
面図、第３図は従来のエレクトロフュージョン継手の一
部を断面で示す正面図である。 各図中、同一符号は同一または相当部分を示し、１はエ
レクトロフュージョン継手、２は樹脂層、2aは架橋ポリ
オレフィン層、2bは非架橋ポリオレフィン層、３は電熱
線、４、５は被接合体、６は接合部である。1 and 2 are front views showing a part of another embodiment in a cross section, and FIG. 3 is a front view showing a part of a conventional electrofusion joint in a cross section. In each figure, the same reference numerals indicate the same or corresponding parts, 1 is an electrofusion joint, 2 is a resin layer, 2a is a crosslinked polyolefin layer, 2b is a noncrosslinked polyolefin layer, 3 is a heating wire, and 4 and 5 are objects to be joined. , 6 are joints.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中芝 明雄 大阪府大阪市中央区平野町４丁目１番２ 号 大阪瓦斯株式会社内 (72)発明者 長谷 文夫 山口県玖珂郡和木町和木６丁目１番２号 三井石油化学工業株式会社内 (72)発明者 水戸 和憲 山口県玖珂郡和木町和木６丁目１番２号 三井石油化学工業株式会社内 (72)発明者 柴渕 利夫 大阪府大阪市住之江区南加賀屋２丁目10 番16号 新和産業株式会社内 (72)発明者 中岡 幹夫 大阪府大阪市住之江区南加賀屋２丁目10 番16号 新和産業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Akio Nakashiba 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka, Osaka Gas Co., Ltd. (72) Fumio Hase 6 Waki, Waki-cho, Kaku-gun, Yamaguchi Prefecture Chome 1-2 Mitsui Petrochemical Co., Ltd. (72) Inventor Kazunori Mito 6 1-2 Waki, Waki-cho, Kuga-gun, Yamaguchi Prefecture Mitsui Petrochemical Co., Ltd. (72) Inventor Toshio Shiabuchi Osaka Prefecture Shinwa Sangyo Co., Ltd. 2-10-16 Minamikagaya, Suminoe-ku, Osaka (72) Inventor Mikio Nakaoka 2-10-16 Minamikagaya, Suminoe-ku, Osaka-shi, Osaka
Claims (1)
た熱可塑性樹脂からなる樹脂層と、この樹脂層に設けら
れた電熱線とを備え、この電熱線は前記樹脂層の内径部
からの距離が樹脂層の中央部で大きく、かつ両端部で小
さくなるような位置に配置されたことを特徴とするエレ
クトロフュージョン継手。1. A resin layer made of a thermoplastic resin formed so as to be in contact with an outer peripheral portion of an article to be joined, and a heating wire provided on the resin layer, the heating wire being an inner diameter portion of the resin layer. The electrofusion joint is characterized in that the distance from is large at the center of the resin layer and small at both ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1072335A JP2545972B2 (en) | 1989-03-24 | 1989-03-24 | Electrofusion fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1072335A JP2545972B2 (en) | 1989-03-24 | 1989-03-24 | Electrofusion fittings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02253093A JPH02253093A (en) | 1990-10-11 |
| JP2545972B2 true JP2545972B2 (en) | 1996-10-23 |
Family
ID=13486319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1072335A Expired - Lifetime JP2545972B2 (en) | 1989-03-24 | 1989-03-24 | Electrofusion fittings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2545972B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2500900Y2 (en) * | 1990-01-23 | 1996-06-12 | 三菱樹脂株式会社 | Repair parts for pipes |
| GB9105937D0 (en) * | 1991-03-20 | 1991-05-08 | Victaulic Plc | Weldable pipe fittings and pipe joints formed therewith |
-
1989
- 1989-03-24 JP JP1072335A patent/JP2545972B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02253093A (en) | 1990-10-11 |
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