JPH02253096A - Electrofusion joint - Google Patents
Electrofusion jointInfo
- Publication number
- JPH02253096A JPH02253096A JP1075956A JP7595689A JPH02253096A JP H02253096 A JPH02253096 A JP H02253096A JP 1075956 A JP1075956 A JP 1075956A JP 7595689 A JP7595689 A JP 7595689A JP H02253096 A JPH02253096 A JP H02253096A
- Authority
- JP
- Japan
- Prior art keywords
- joint
- heating wire
- cross
- layer
- polyolefin
- 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 24
- 239000011148 porous material Substances 0.000 claims abstract description 19
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 18
- 229920000098 polyolefin Polymers 0.000 abstract description 52
- 230000004927 fusion Effects 0.000 abstract description 18
- 238000004132 cross linking Methods 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract description 5
- 239000003431 cross linking reagent Substances 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005304 joining Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 239000000155 melt Substances 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
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004711 α-olefin Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 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
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000008961 swelling Effects 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
- 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
- B29C66/50—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
- B29C66/90—Measuring or controlling the joining process
- B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
- B29C66/972—Checking completion of joining or correct joining by using indications on at least one of the joined parts by extrusion of molten material
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
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
水用の導管を融着により完全に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。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrofusion joint for completely joining objects to be joined such as polyolefin pipes, particularly hot water conduits, by fusion.
従来、給水、給湯あるいはガス用などの導管として用い
られる樹脂製パイプなどの被接合体を融着により接合す
るエレクトロフュージョン継手が使用されている。Conventionally, electrofusion joints have been used to join objects to be joined, such as resin pipes used as conduits for water supply, hot water supply, or gas, by fusion bonding.
従来の熱可塑性樹脂より形成されたエレクトロフュージ
ョン継手としては、被接合体を融着により接合した後に
、被接合体が完全に融着されたかどうかを確認するため
に、継手本体に細孔を設け、融着時にその細孔から内部
の溶融樹脂が膨出するようにしたエレクトロフュージョ
ン継手が公知である（例えば特開昭６１−６２６９６号
）。Conventional electrofusion joints made of thermoplastic resin have small holes in the joint body to check whether the objects are completely fused after they are joined by fusion. An electrofusion joint is known in which the molten resin inside the joint bulges out from its pores during fusion (for example, JP-A No. 61-62696).
しかしながら、このような従来のエレクトロフュージョ
ン継手は、上から下まで全長にわたって同径のまたは上
が大径の細孔が形成されているため、樹脂の膨出を確認
しにくく、融着完了時点を正確に検出できないなどの問
題点がある。However, in such conventional electrofusion joints, pores are formed with the same diameter along the entire length from top to bottom, or with a larger diameter at the top, making it difficult to confirm the swelling of the resin and making it difficult to determine when fusion is complete. There are problems such as inability to detect accurately.
本発明の目的は、」１記問題点を解決するため、継手の
融着完了時点の確認を行い易く、これにより被接合体を
完全に融着して、シール性が高く、作業性も良好なエレ
クトロフュージョン継手を提供することである。The purpose of the present invention is to solve the problem described in item 1, by making it easy to confirm when the welding of the joint is complete, thereby completely welding the objects to be welded, and achieving high sealing performance and good workability. The purpose of the present invention is to provide electrofusion fittings that are suitable for electrofusion.
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管状の樹脂層と、この樹脂層の内
部、外表面、または内表面に設けられた電熱線と、継手
の外表面側から電熱線付近まで伸び、かつ開口部の面積
よりも内部の断面積が大きい細孔とを有するエレクトロ
フュージョン継手である。The present invention provides a tubular resin layer made of thermoplastic resin that is formed so as to be in contact with the outer circumferential portion of an object to be joined, a heating wire provided on the inside, outer surface, or inner surface of this resin layer, and a joint. This is an electrofusion joint that extends from the outer surface side to near the heating wire and has a pore whose internal cross-sectional area is larger than the area of the opening.
本発明においては、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いが、その一部を構
成するものであってもよい。例えば」１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。上記樹脂層に設け
られた電熱線は、被接合体に接する位置付近に配置され
ることが好ましい。さらに熱可塑性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 thermoplastic resin may constitute the entire joint, or may constitute a part thereof. For example, the resin layer described in 1. may be formed on the part that comes into contact with both objects to be joined, but it may be formed only on the part that comes into contact with one object, and the other object is a screw, etc. They may be joined by other joining members having mechanical joining means. Further, the resin layer may be formed only on the inner circumferential portion in contact with the objects to be joined, and another resin layer having strength may be laminated on the outer circumferential portion. It is preferable that the heating wire provided in the resin layer be placed near a position in contact with the object to be joined. Furthermore, it is preferable that the thermoplastic resin layer and the object to be joined be made of the same type of resin or resins that are compatible with each other.
本発明のエレクトロフュージョン継手は、樹脂層の内部
、外表面または内表面の被接合体と接する位置付近に電
熱線を配置し、その付近の内径が開口部の内径よりも大
きい金属あるいは樹脂製のろう斗状の成形体をインサー
トして、熱可塑性樹脂により射出成形を行うことにより
製造される。In the electrofusion joint of the present invention, heating wires are arranged inside the resin layer, on the outer surface, or near the position where the inner surface contacts the object to be joined, and the inner diameter of the heating wire in the vicinity is larger than the inner diameter of the opening. It is manufactured by inserting a funnel-shaped molded body and performing injection molding with thermoplastic resin.
こうして製造されたエレク１−ロフユージョン継手は、
ポリオレフィンチューブ等の被接合体の接合部に、熱可
塑性の樹脂層が被接合体と接するように取付け、電熱線
に通電すると、熱可塑性の樹脂層が溶融して被接合体に
一体的に融着する。The Elec 1-Rof fusion joint manufactured in this way is
Attach the thermoplastic resin layer to the joint of objects such as polyolefin tubes so that it is in contact with the objects, and when the heating wire is energized, the thermoplastic resin layer melts and fuses integrally with the objects. wear.
この融着に際しては、電熱線から供給される熱で熱可塑
性樹脂からなる樹脂層が溶融して膨張し、細孔内を溶融
樹脂が上昇する。そして溶融が進むと、被接合体との融
着が進むとともに、溶融樹脂が細孔から押出されて継手
の外表面に突出し、融着完了時点を表示する。このとき
細孔の内部の断面積が開口部の面積よりも大きくなって
いるため、断面積の大きい電熱線付近から上昇する押出
流量が、継手外表面部では小面積の開口部から押出され
、樹脂の突出高さが高くなる。これにより融着完了時点
を容易かつ正確に確認することができる。During this fusion, the resin layer made of thermoplastic resin melts and expands due to the heat supplied from the heating wire, and the molten resin rises within the pores. Then, as the melting progresses, the fusion with the object to be joined progresses, and the molten resin is extruded from the pores and protrudes onto the outer surface of the joint, indicating the time when the fusion is completed. At this time, since the cross-sectional area inside the pore is larger than the area of the opening, the extrusion flow rate that rises from near the heating wire, which has a large cross-sectional area, is extruded from the opening with a small area on the outer surface of the joint. The protrusion height of the resin increases. This makes it possible to easily and accurately confirm the point at which fusion is completed.
被接合体としては表層または全体が熱可塑性樹脂、特に
相溶性を有する樹脂からなるものが好ましく、非架橋の
ポリオレフィンからなるものは特に優れた融着性を示す
。The object to be joined is preferably one whose surface layer or the entirety is made of a thermoplastic resin, particularly a compatible resin, and one which is made of a non-crosslinked polyolefin exhibits particularly excellent fusion bonding properties.
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２と、こ
の架橋ポリオレフィン層２の内側の被接合体５．６に接
する位置に、架橋ポリオレフィンＭ２と一体的に形成さ
れた熱可塑性の樹脂層としての非架橋ポリオレフィン層
３と、この非架橋ポリオレフィン層３の内部に設けられ
たコイル形状の電熱線４と、継手１の外表＝４
面側から架橋ポリオレフィンＭ２および非架橋ポリオレ
フィン層３の界面の電熱線４付近まで伸び、かつ電熱線
４付近で外表面の開口部より大きい内径となっているろ
う斗状の細孔７とを有する。FIG. 1 is a front view showing a cross section of the right half of the electrofusion joint of the embodiment, which is symmetrically constructed. In the figure, 1 is an electrofusion joint, which is formed integrally with a tubular crosslinked polyolefin layer 2 forming the joint body and a crosslinked polyolefin M2 at a position inside this crosslinked polyolefin layer 2 in contact with the object to be joined 5.6. A non-crosslinked polyolefin layer 3 as a thermoplastic resin layer, a coil-shaped heating wire 4 provided inside the non-crosslinked polyolefin layer 3, and a cross-linked polyolefin M2 and a non-crosslinked polyolefin M2 from the outer surface of the joint 1 = 4. The crosslinked polyolefin layer 3 has funnel-shaped pores 7 that extend to the vicinity of the heating wire 4 at the interface thereof and have a larger inner diameter near the heating wire 4 than the opening on the outer surface.
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 polyolefins have a three-dimensional structure due to intermolecular crosslinking of polyolefins, and in addition to those crosslinked with crosslinking agents such as silane crosslinked polyolefins and divinylbenzene crosslinked polyolefins, they can also be crosslinked directly with organic peroxides, radiation, etc. 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 polyolefin resin that does not have crosslinking properties and is 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−メチルペンテンなどがあ
げられる。Examples of polyolefins include single or copolymers of α-olefins having 2 to 20 carbon atoms, preferably 2 to 12 carbon atoms. Preferred α-olefins include ethylene,
Examples include propylene and butene-1,4-methylpentene.
被接合体５．６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。架橋ポリオレフィン層２は被接合体５
．６の突合せ部８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５．６に対応
する部分の内周に非架橋ポリオレフィン層３が積層され
、その中に電熱線４が埋設されている。The object to be joined 5.6 consists of a tube having a thermoplastic resin layer such as polyethylene, and may be entirely made of a fusible thermoplastic resin, but if a heat-resistant material such as crosslinked polyolefin is used, the outer surface A material coated with a fusible thermoplastic resin is used. The crosslinked polyolefin layer 2 is the object to be joined 5
．． The non-crosslinked polyolefin layer 3 is laminated on the inner periphery of the portion corresponding to each object to be joined 5.6 on both sides in the longitudinal direction. A heating wire 4 is buried.
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３中に電熱線４を埋設した状態で、細孔７
を形成するろう斗状の成形体７ａとともに成形型にイン
サー１〜し、ポリオレフィン中に架橋剤、架橋助剤等を
含む架橋性ポリオレフィンを射出して、積層一体止する
とともに細孔７を形成した後、上記架橋性ポリオレフィ
ン層を架橋させて架橋ポリオレフィン層２を形成するこ
とにより製造される。The above electrofusion joint 1- has a heating wire 4 embedded in a non-crosslinked polyolefin layer 3, and a pore 7
The inserts 1 to 1 were placed in a mold together with the funnel-shaped molded body 7a forming the molded body, and a crosslinkable polyolefin containing a crosslinking agent, a crosslinking aid, etc. was injected into the polyolefin to fix the lamination and form pores 7. Thereafter, the crosslinkable polyolefin layer 2 is formed by crosslinking the crosslinkable polyolefin layer.
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。Crosslinked polyolefin does not have fusion properties, so even if crosslinked polyolefin and non-crosslinked polyolefin are molded by extrusion molding, injection molding, etc., each layer will separate and will not be integrated. When a polyolefin and a 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.
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５．６の突合せ部
８付近に、非架橋ポリオレフィン層３が被接合体５．６
と接するように取付け、電熱線４に通電すると、非架橋
ポリオレフィン層３が溶融して被接合体５，６に融着し
て一体化する。The electrofusion joint 1 manufactured in this way is
A non-crosslinked polyolefin layer 3 is placed on the object 5.6 such as a polyolefin tube near the abutting portion 8 of the object 5.6.
When the heating wire 4 is energized, the non-crosslinked polyolefin layer 3 is melted and fused to the objects 5 and 6 to be integrated.
この融着に際しては、電熱線４から供給される熱で非架
橋ポリオレフィン層３が溶融して膨張し、細孔７内を溶
融樹脂が上昇する。そして溶融が進むと、被接合体５．
６との融着が進むとともに、溶融樹脂が細孔７から押出
されて、継手１の外表面に突出して突出部３ａを形成し
、融着完了時点を表示する。このとき細孔７の内部の断
面積が開口部の面積よりも大きくなっているため、断面
積の大きい電熱線４付近から上昇する押出流量が継手１
の外表面部では小面積の開口部から押出されて突出部３
ａの高さが高くなる。これにより融着完了時点を容易か
つ正確に確認することができる。During this fusion, the non-crosslinked polyolefin layer 3 melts and expands due to the heat supplied from the heating wire 4, and the molten resin rises within the pores 7. As the melting progresses, the objects to be joined 5.
As the fusion with the joint 1 progresses, the molten resin is extruded from the pores 7 and protrudes from the outer surface of the joint 1 to form a protrusion 3a, indicating the completion of fusion. At this time, since the cross-sectional area of the inside of the pore 7 is larger than the area of the opening, the extrusion flow rate rising from the vicinity of the heating wire 4, which has a large cross-sectional area, is transferred to the joint 1.
The protrusion 3 is pushed out from the small-area opening on the outer surface of the
The height of a becomes higher. This makes it possible to easily and accurately confirm the point at which fusion is completed.
架橋ポリオレフィン層２は溶融してもゲル状を保って流
出せず、非架橋ポリオレフィンのみが流出するので、こ
の時点で電熱線４への通電を停止することができる。Even if the crosslinked polyolefin layer 2 is melted, it remains in a gel state and does not flow out, and only the non-crosslinked polyolefin flows out, so that the power supply to the heating wire 4 can be stopped at this point.
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Ｎ２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。一方弁架橋ポリオレフィン層３が架橋ポリオレフィ
ン層２と一体化した状態で、被接合体５．６に融着して
一体化するため、シール性に優れ、給湯管に用いても長
期にわたってシール性を保持する。The electrofusion joint 1 described above has excellent shape retention even when used for joining hot water pipes, etc., since the tubular crosslinked polyolefin N2 forming the joint body provides heat resistance strength. On the other hand, since the valve cross-linked polyolefin layer 3 is integrated with the cross-linked polyolefin layer 2 and is fused and integrated with the object to be joined 5.6, it has excellent sealing properties and can maintain sealing properties for a long time even when used in hot water pipes. Hold.
なお、上記の実施例では樹脂層は架橋ポリオレフィン層
２と非架橋ポリオレフィン層３の積層体にしたが、熱可
塑性樹脂よりなる単層構造としても良い。そして継手は
左右対称となるように、両一
側に非架橋ポリオレフィン層３および電熱線４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
ても良い。また電熱線４を非架橋ポリオレフィン層３の
外表面または内表面に設けても良い。さらに細孔７は成
形体７ａを配置してインサート成形により形成したが、
成形体７ａを使用せずに形成しても良い。In the above embodiment, the resin layer is a laminate of the crosslinked polyolefin layer 2 and the non-crosslinked polyolefin layer 3, but it may also have a single layer structure made of thermoplastic resin. In order to make the joint symmetrical, an example was shown in which the non-crosslinked polyolefin layer 3 and the heating wire 4 were provided on both sides, but one side, for example, the right side of FIG. A connecting member having a connecting portion such as a screw may be attached to the left side to mechanically join the object to be joined. Further, the heating wire 4 may be provided on the outer surface or the inner surface of the non-crosslinked polyolefin layer 3. Furthermore, the pores 7 were formed by insert molding by arranging the molded body 7a.
It may also be formed without using the molded body 7a.
本発明によれば、熱可塑性樹脂層に電熱線および開口部
より内部の断面積が大きい細孔を設けたので、継手の融
着完了時点の確認を行い易く、これにより被接合体を完
全に融着してシール性に優れ、かつ取付作業等の作業性
にも優れたエレクトロフュージョン継手が得られる。According to the present invention, since the thermoplastic resin layer is provided with pores whose internal cross-sectional area is larger than that of the heating wire and the opening, it is easy to confirm when the fusion of the joint is completed, and this makes it possible to completely seal the objects to be joined. An electrofusion joint can be obtained that is fused and has excellent sealing properties and is also excellent in workability such as installation work.
第１図は実施例の一部を断面で示す正面図である。
図中、２は架橋ポリオレフィン層、３は非架橋ポリオレ
フィン層、
４は電熱線、
５．
６は被接合
体。
７は細孔である。FIG. 1 is a front view showing a part of the embodiment in cross section. In the figure, 2 is a crosslinked polyolefin layer, 3 is a non-crosslinked polyolefin layer, 4 is a heating wire, and 5. 6 is the object to be joined. 7 is a pore.
Claims (1)
塑性樹脂からなる管状の樹脂層と、この樹脂層の内部、
外表面、または内表面に設けられた電熱線と、継手の外
表面側から電熱線付近まで伸び、かつ開口部の面積より
も内部の断面積が大きい細孔とを有するエレクトロフュ
ージョン継手。(1) A tubular resin layer made of thermoplastic resin formed so as to be in contact with the outer periphery of the object to be joined, and the inside of this resin layer,
An electrofusion joint having a heating wire provided on an outer surface or an inner surface, and a pore extending from the outer surface of the joint to near the heating wire and having an internal cross-sectional area larger than the area of the opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1075956A JP2639079B2 (en) | 1989-03-28 | 1989-03-28 | Electrofusion fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1075956A JP2639079B2 (en) | 1989-03-28 | 1989-03-28 | Electrofusion fittings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02253096A true JPH02253096A (en) | 1990-10-11 |
| JP2639079B2 JP2639079B2 (en) | 1997-08-06 |
Family
ID=13591186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1075956A Expired - Lifetime JP2639079B2 (en) | 1989-03-28 | 1989-03-28 | Electrofusion fittings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2639079B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103363233A (en) * | 2013-06-29 | 2013-10-23 | 联塑科技发展(武汉)有限公司 | Plastic pipe connecting method |
| JP2018173148A (en) * | 2017-03-31 | 2018-11-08 | 積水化学工業株式会社 | Expandable joint and piping structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6162696A (en) * | 1984-08-28 | 1986-03-31 | ヴァーフィン・アクチェンゲゼルシャフト | Weldable joint member for connecting or joining thermoplastic plastic pipe element |
| FR2606487A1 (en) * | 1986-11-07 | 1988-05-13 | Silix | Tubes based on a polyolefin-type resin for producing pipelines, sleeves for assembling them and method for manufacturing them |
-
1989
- 1989-03-28 JP JP1075956A patent/JP2639079B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6162696A (en) * | 1984-08-28 | 1986-03-31 | ヴァーフィン・アクチェンゲゼルシャフト | Weldable joint member for connecting or joining thermoplastic plastic pipe element |
| FR2606487A1 (en) * | 1986-11-07 | 1988-05-13 | Silix | Tubes based on a polyolefin-type resin for producing pipelines, sleeves for assembling them and method for manufacturing them |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103363233A (en) * | 2013-06-29 | 2013-10-23 | 联塑科技发展(武汉)有限公司 | Plastic pipe connecting method |
| JP2018173148A (en) * | 2017-03-31 | 2018-11-08 | 積水化学工業株式会社 | Expandable joint and piping structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2639079B2 (en) | 1997-08-06 |
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