JPH04347094A - Insulation resistance wire for deposited joint - Google Patents
Insulation resistance wire for deposited jointInfo
- Publication number
- JPH04347094A JPH04347094A JP3116021A JP11602191A JPH04347094A JP H04347094 A JPH04347094 A JP H04347094A JP 3116021 A JP3116021 A JP 3116021A JP 11602191 A JP11602191 A JP 11602191A JP H04347094 A JPH04347094 A JP H04347094A
- Authority
- JP
- Japan
- Prior art keywords
- resistance wire
- wire
- welded joint
- insulating film
- baking
- 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
- 238000009413 insulation Methods 0.000 title abstract description 13
- 239000002966 varnish Substances 0.000 claims abstract description 29
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 24
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000005977 Ethylene Substances 0.000 claims abstract description 5
- 229920006163 vinyl copolymer Polymers 0.000 claims abstract description 5
- 239000010754 BS 2869 Class F Substances 0.000 claims description 11
- 239000011256 inorganic filler Substances 0.000 claims description 9
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 9
- 239000002313 adhesive film Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 abstract description 5
- 230000001070 adhesive effect Effects 0.000 abstract description 5
- 239000002904 solvent Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 229920003023 plastic Polymers 0.000 description 8
- 239000004033 plastic Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229920003055 poly(ester-imide) Polymers 0.000 description 4
- -1 sewerage Substances 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 239000004642 Polyimide Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004962 Polyamide-imide Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910001120 nichrome Inorganic materials 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 229920002312 polyamide-imide Polymers 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910001179 chromel Inorganic materials 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- UTICYDQJEHVLJZ-UHFFFAOYSA-N copper manganese nickel Chemical compound [Mn].[Ni].[Cu] UTICYDQJEHVLJZ-UHFFFAOYSA-N 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
- B29D23/003—Pipe joints, e.g. straight joints
- B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
-
- 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
- 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
- B29C65/348—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 with a polymer coating
-
- 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
- B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
- B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
- B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
-
- 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
- B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
- B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
- B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
-
- 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
- B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
- B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
-
- 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
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、プラスチック管接続用
の溶着継手に埋設され、発熱により溶着継手と管の接触
面を加熱溶融する機能を有する絶縁抵抗線に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated resistance wire that is embedded in a welded joint for connecting plastic pipes and has the function of heating and melting the contact surface between the welded joint and the pipe by generating heat.
【０００２】0002
【従来の技術】溶着継手は、上下水道やガス管等に使用
されるプラスチック管の管継手として近年開発されたも
ので、筒状の継手本体の内周部に抵抗線をコイル状に埋
設した構造で、管の接続は、継手の両側より接続する管
を嵌挿後抵抗線に通電し、接続面を加熱溶融する機能を
有している。この場合、抵抗線は一般にニクロム線等の
発熱抵抗線が用いられている（特公昭６１−４１２９２
号公報参照）。[Prior Art] Welded joints have been developed in recent years as pipe joints for plastic pipes used in water, sewerage, gas, etc. pipes, and are made by embedding a resistance wire in a coil shape inside the cylindrical joint body. The structure has the function of connecting the pipes by inserting and inserting the pipes to be connected from both sides of the joint and then applying current to the resistance wires to heat and melt the connection surfaces. In this case, a heat-generating resistance wire such as a nichrome wire is generally used as the resistance wire (Japanese Patent Publication No. 61-41292
(see publication).
【０００３】ところが抵抗線が裸であると、プラスチッ
ク管を連結する時に、抵抗線を埋設させている継手本体
の内周部が流動化し、それに伴ってコイル状に埋設させ
た抵抗線が移動し、隣接する線間が接触して抵抗値が変
化し、発熱が不均一となり、溶着不良を生じることがあ
る。そのため、継手本体の内周部に埋設する抵抗線はそ
の表面が絶縁物で被覆されているのが望ましい。一般に
抵抗線を絶縁処理する手段はマグネットワイヤー用の耐
熱性絶縁ワニスを裸抵抗線に塗布焼付して絶縁皮膜を形
成する手段や、耐熱性のプラスチックテープを裸抵抗線
に巻き付けて絶縁皮膜を形成する手段や、ガラス布，ガ
ラス線を裸抵抗線に巻き付けて絶縁皮膜を形成する手段
等が採用されている。尚、絶縁処理工法のコストから一
般には、マグネットワイヤー用の耐熱性絶縁ワニス、例
えば、ポリイミドワニス、ポリエステルイミドワニス、
ポリアミドワニス等を裸抵抗線に塗布焼付して絶縁皮膜
を形成する手段が使用されている。However, if the resistance wire is bare, when connecting plastic pipes, the inner circumference of the joint body in which the resistance wire is buried becomes fluid, and the resistance wire buried in a coil shape moves accordingly. , adjacent wires may come into contact and the resistance value changes, causing uneven heat generation and resulting in poor welding. Therefore, it is desirable that the surface of the resistance wire buried in the inner circumference of the joint body be coated with an insulating material. Generally, the methods for insulating resistance wires include applying heat-resistant insulating varnish for magnet wires to the bare resistance wire and baking it to form an insulation film, or wrapping heat-resistant plastic tape around the bare resistance wire to form an insulation film. For example, a method of wrapping a glass cloth or a glass wire around a bare resistance wire to form an insulating film has been adopted. In addition, due to the cost of insulation treatment methods, heat-resistant insulation varnish for magnet wires, such as polyimide varnish, polyester imide varnish,
A method is used in which an insulating film is formed by applying polyamide varnish or the like to a bare resistance wire and baking it.
【０００４】0004
【発明が解決しようとする課題】しかしながら、上述の
ような絶縁抵抗線が埋設されている溶着継手にあっては
通電時に絶縁抵抗線が隣接する線間で短絡しないよう改
善されたが、溶着継手の継手本体を形成する樹脂と抵抗
線との間に絶縁皮膜が介在することになるため、次のよ
うな問題が生じる。[Problem to be Solved by the Invention] However, in the case of welded joints in which insulated resistance wires are buried as described above, improvements have been made so that the insulated resistance wires do not short-circuit between adjacent wires when energized. Since an insulating film is interposed between the resin forming the joint body and the resistance wire, the following problems occur.
【０００５】まず、抵抗線と継手本体との密着性が、継
手の温度（温度が高くなると、樹脂とコイルの熱膨張差
により密着度が低下し、温度が低下すると収縮により密
着度が増加する）、成形時の溶融樹脂の圧力、成形時の
残留応力、経時変化等によって影響され易くなり、ひど
い場合には成形時の冷却固化の過程において樹脂の収縮
により樹脂がコイルから剥離することがある。導電線と
樹脂との密着性が悪いと、コイルが部分的に異常加熱さ
れ、その箇所が熱劣化を受け、融着性能を低下させる原
因になる。つまり、樹脂に溶けるところと溶けないとこ
ろが生じ、融着にバラツキが生じるようになる。First, the adhesion between the resistance wire and the joint body depends on the temperature of the joint (as the temperature rises, the degree of adhesion decreases due to the difference in thermal expansion between the resin and the coil, and as the temperature decreases, the degree of adhesion increases due to contraction). ), it is easily affected by the pressure of the molten resin during molding, residual stress during molding, changes over time, etc., and in severe cases, the resin may peel off from the coil due to shrinkage of the resin during the cooling and solidification process during molding. . If the adhesion between the conductive wire and the resin is poor, a portion of the coil may be abnormally heated, resulting in thermal deterioration at that location, resulting in a reduction in fusing performance. In other words, there are parts that dissolve in the resin and parts that do not, resulting in variations in fusion bonding.
【０００６】また、抵抗線が発熱しても絶縁被覆によっ
て抵抗線から継手本体への熱伝導が遮られ、裸抵抗線の
場合よりも熱放散性が悪くなるという問題も生じていた
。[0006] Furthermore, even if the resistance wire generates heat, the insulating coating blocks heat conduction from the resistance wire to the joint body, resulting in a problem that heat dissipation becomes worse than in the case of a bare resistance wire.
【０００７】本発明は、上記従来の問題に着目し、熱放
散性が良好な溶着継手用の絶縁抵抗線を提供することを
第１の目的とし、樹脂との密着性が高い溶着継手用の絶
縁抵抗線を提供することを第２の目的としている。The present invention has focused on the above-mentioned conventional problems, and has as its first object to provide an insulated resistance wire for welded joints that has good heat dissipation properties. A second purpose is to provide an insulated resistance wire.
【０００８】[0008]
【課題を解決するための手段】上記第１の目的を達成す
る手段として、本発明請求項２記載の溶着継手用の絶縁
抵抗線は、裸抵抗線の外周に絶縁皮膜が設けられている
溶着継手用の絶縁抵抗線において、前記絶縁皮膜が、耐
熱性がＦ種以上の絶縁ワニスに熱伝導率の良好な無機充
填剤を添加してなる微粒子分散型絶縁ワニスを均一厚さ
に塗布焼付して形成されている。尚、この無機充填剤は
、粒子径が１５μｍ以下の粒子を使用するのが望ましい
。[Means for Solving the Problem] As a means for achieving the first object, an insulated resistance wire for a welded joint according to claim 2 of the present invention is a welded resistance wire in which an insulating film is provided on the outer periphery of a bare resistance wire. In the insulated resistance wire for joints, the insulating film is made by coating and baking a fine particle dispersed insulating varnish, which is made by adding an inorganic filler with good thermal conductivity to an insulating varnish with heat resistance of class F or higher, to a uniform thickness. It is formed by Incidentally, it is desirable to use particles having a particle size of 15 μm or less as this inorganic filler.
【０００９】また、上記第２の目的を達成する手段とし
て、本発明請求項１記載の溶着継手用の絶縁抵抗線は、
裸抵抗線の外周に絶縁皮膜が設けられている溶着継手用
の絶縁抵抗線において、前記絶縁皮膜が、耐熱性がＦ種
以上の絶縁ワニスを均一厚さに塗布焼付して形成され、
該絶縁皮膜の外周に、エチレンを主体としたビニル共重
合体からなる樹脂溶液を塗布焼付して形成した接着皮膜
が設けられている。[0009] Furthermore, as a means for achieving the second object, an insulated resistance wire for a welded joint according to claim 1 of the present invention comprises:
In an insulated resistance wire for a welded joint in which an insulating film is provided on the outer periphery of a bare resistance wire, the insulating film is formed by applying and baking an insulating varnish having a heat resistance of class F or higher to a uniform thickness,
An adhesive film is provided around the outer periphery of the insulating film, which is formed by applying and baking a resin solution made of a vinyl copolymer mainly composed of ethylene.
【００１０】本発明において、耐熱性がＦ種以下とは、
１４０℃以上、好ましくは１５０℃以上の使用温度条件
下において耐熱性を保証できるということを意味する。[0010] In the present invention, heat resistance of class F or below means
This means that heat resistance can be guaranteed under usage temperature conditions of 140°C or higher, preferably 150°C or higher.
【００１１】[0011]
【作用】本発明請求項１記載の溶着継手用の絶縁抵抗線
は、絶縁皮膜が、耐熱性がＦ種以上の絶縁ワニスに熱伝
導率の良好な無機充填剤を添加してなる無機充填剤分散
型の絶縁ワニスを均一厚さに塗布焼付して形成されてい
るので、抵抗線の発熱時に絶縁皮膜によって熱伝導が遮
られることなく抵抗線の線間における短絡を防止するこ
とができる。[Function] In the insulated resistance wire for welded joints according to claim 1 of the present invention, the insulating coating is an inorganic filler formed by adding an inorganic filler having good thermal conductivity to an insulating varnish having heat resistance of class F or higher. Since it is formed by applying and baking a dispersed insulating varnish to a uniform thickness, it is possible to prevent short circuits between the resistance wires without interrupting heat conduction by the insulation film when the resistance wires generate heat.
【００１２】本発明請求項２記載の溶着継手用の絶縁抵
抗線は、絶縁皮膜が、耐熱性がＦ種以上の絶縁ワニスを
均一厚さに塗布焼付して形成され、該絶縁皮膜の外周に
、エチレンを主体としたビニル共重合体からなる樹脂溶
液を塗布焼付して形成した接着皮膜が設けられているの
で、表面の接着力を強化しながら抵抗線の線間における
短絡を防止することができる。In the insulated resistance wire for a welded joint according to claim 2 of the present invention, the insulating film is formed by applying and baking an insulating varnish having a heat resistance of class F or higher to a uniform thickness, and the outer periphery of the insulating film is Since the adhesive film is formed by applying and baking a resin solution made of a vinyl copolymer mainly composed of ethylene, it is possible to prevent short circuits between resistance wires while strengthening the surface adhesion. can.
【００１３】[0013]
【実施例】以下、本発明の第１実施例を図１及び図２に
基づいて詳述する。図１は本発明第１実施例の溶着継手
を示す断面図で、本実施例の溶着継手は、継手本体１が
ポリプロピレン樹脂，ポリエチレン樹脂，塩化ビニル樹
脂，ポリブデン樹脂等の熱可塑性樹脂を素材とし、同径
の開口端１１，１２を有する円筒状に形成されている。
また、前記継手本体１の外周部の両端２箇所には円筒状
のボス１３，１４が突設されており、各ボス１３，１４
内には、主として真鍮や砲金、銅等の低抵抗材料で形成
されたターミナルピン２が内蔵されている。更に、前記
継手本体１の内周部には、両端を前記ターミナルピン２
と接続させた絶縁抵抗線３がコイル状に埋設されている
。尚、この溶着継手は、コアの外周に絶縁抵抗線３をコ
イル状に巻き、絶縁抵抗線３を巻き終えたコアを金型内
にセットして型締めした後、射出成形により成形するも
のである。Embodiment A first embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2. FIG. 1 is a sectional view showing a welded joint according to the first embodiment of the present invention. In the welded joint of this embodiment, the joint body 1 is made of thermoplastic resin such as polypropylene resin, polyethylene resin, vinyl chloride resin, polybdenum resin, etc. , is formed into a cylindrical shape having open ends 11 and 12 of the same diameter. Moreover, cylindrical bosses 13 and 14 are provided protrudingly at two locations on both ends of the outer circumference of the joint body 1, and each boss 13, 14
A terminal pin 2 made of a low-resistance material such as brass, gunmetal, or copper is built inside. Further, on the inner circumference of the joint body 1, both ends are connected to the terminal pins 2.
An insulated resistance wire 3 connected to the wire is buried in a coil shape. In addition, this welded joint is formed by winding the insulated resistance wire 3 in a coil around the outer periphery of the core, setting the core with the insulated resistance wire 3 wound in a mold, clamping the mold, and then molding it by injection molding. be.
【００１４】図２は前記溶着継手の要部拡大図で、この
図２に示すように前記絶縁抵抗線３は、抵抗線３１と絶
縁皮膜３２と接着皮膜３３で構成されている。FIG. 2 is an enlarged view of the essential parts of the welded joint. As shown in FIG. 2, the insulated resistance wire 3 is composed of a resistance wire 31, an insulating film 32, and an adhesive film 33.
【００１５】前記抵抗線３１は表面が実質的に酸化され
ていない金属線が使用されている。表面が実質的に酸化
されていない金属線とは、精練された直後の金属に限ら
ず、表面の不働体酸化膜を除去して得られた金属線であ
ってもよい。尚、金属線の表面から酸化膜を除去するた
めには、金属の表面を還元腐食させればよい。The resistance wire 31 is a metal wire whose surface is substantially not oxidized. The metal wire whose surface is not substantially oxidized is not limited to the metal immediately after being refined, but may be a metal wire obtained by removing the passive oxide film on the surface. Note that in order to remove the oxide film from the surface of the metal wire, the surface of the metal may be subjected to reductive corrosion.
【００１６】また、前記抵抗線３１は、ニクロム線、鉄
クロム合金線、銅線、銅ニッケル合金線、鉄ニッケル合
金線、マンガン線、銅ニッケルマンガン合金線、ニッケ
ルクロム合金線、クロメル線等の一般抵抗線を使用する
ことができる。更にこの抵抗線３１は、一本の線材から
なるものに限らず、細い線材を複数束ねたものも使用す
ることができる。The resistance wire 31 may be a nichrome wire, an iron-chromium alloy wire, a copper wire, a copper-nickel alloy wire, an iron-nickel alloy wire, a manganese wire, a copper-nickel-manganese alloy wire, a nickel-chromium alloy wire, a chromel wire, or the like. General resistance wire can be used. Furthermore, the resistance wire 31 is not limited to one made of a single wire, but may also be made of a plurality of thin wires bundled together.
【００１７】前記絶縁皮膜３２は、前記抵抗線３１の外
周に設けられており、耐熱性がＦ種以上の絶縁ワニスを
均一厚さに塗布焼付して形成されている。尚、耐熱性が
Ｆ種以上の絶縁ワニスとしては、ポリイミドワニス、ポ
リエステルイミドワニス、ポリアミドイミドワニス等が
使用できる。The insulating film 32 is provided on the outer periphery of the resistance wire 31, and is formed by applying and baking an insulating varnish having a heat resistance of class F or higher to a uniform thickness. Note that as the insulating varnish having heat resistance of class F or higher, polyimide varnish, polyesterimide varnish, polyamideimide varnish, etc. can be used.
【００１８】前記接着皮膜３３は、該絶縁皮膜３２の外
周に設けられており、エチレンを主体としたビニル共重
合体からなる樹脂溶液を塗布焼付して形成されている。
尚、絶縁皮膜３２の外周に接着皮膜３３を生成する方法
としては、エチレン−酢酸ビニル共重合体５ｋｇと酢酸
エチル・キシレン混合溶剤（混合比５：５）２０ｋｇを
塗料撹拌機に投入して４０℃の温度に加温し、５時間撹
拌して接着ワニスを製造する。そして、焼付乾燥炉を用
いてその接着ワニスを絶縁皮膜３２の外周に塗布焼付す
る方法がある。この場合の接着皮膜３３の厚さは、例え
ば１５μｍ程度にすることができる。The adhesive film 33 is provided on the outer periphery of the insulating film 32, and is formed by applying and baking a resin solution made of a vinyl copolymer mainly composed of ethylene. In addition, as a method for forming the adhesive film 33 on the outer periphery of the insulating film 32, 5 kg of ethylene-vinyl acetate copolymer and 20 kg of an ethyl acetate/xylene mixed solvent (mixing ratio 5:5) are put into a paint stirrer, The adhesive varnish is prepared by heating to a temperature of 0.degree. C. and stirring for 5 hours. Then, there is a method of applying and baking the adhesive varnish on the outer periphery of the insulating film 32 using a baking drying oven. The thickness of the adhesive film 33 in this case can be, for example, about 15 μm.
【００１９】プラスチック管Ｐの接続は、継手本体１の
両開口端１１，１２から接続するプラスチック管Ｐを嵌
挿させ、その後、ターミナルピン２，２間に一定電圧を
かけて抵抗線３１に通電する。そうすると、抵抗線３１
が発熱してその周辺の樹脂が加熱溶融し、継手本体１の
内周面とプラスチック管Ｐの外周面とが融着する。To connect the plastic pipe P, insert the plastic pipe P to be connected from both open ends 11 and 12 of the joint body 1, and then apply a constant voltage between the terminal pins 2 and 2 to energize the resistance wire 31. do. Then, resistance line 31
generates heat, the resin around it heats and melts, and the inner circumferential surface of the joint body 1 and the outer circumferential surface of the plastic pipe P are fused together.
【００２０】この時、本実施例の溶着継手にあっては、
絶縁抵抗線３が上述のように構成されているため、表面
の接着力を強化しながらも抵抗線３１の線間における通
電時の短絡を防止することができる。従って、継手本体
１を形成する樹脂との密着性が向上し、抵抗線３１の過
熱による樹脂の劣化や融着性能の低下を解消することが
できる。At this time, in the welded joint of this embodiment,
Since the insulated resistance wire 3 is configured as described above, it is possible to prevent short circuits between the resistance wires 31 when electricity is applied while strengthening the adhesive force on the surface. Therefore, the adhesion with the resin forming the joint body 1 is improved, and deterioration of the resin and decrease in fusion performance due to overheating of the resistance wire 31 can be prevented.
【００２１】次に、図３及び図４に基づいて第２実施例
を説明する。図３は本実施例の溶着継手の要部を示す断
面図、図４は前記要部を更に拡大した図で、図中４は、
絶縁抵抗線である。この絶縁抵抗線４は、抵抗線４１と
絶縁皮膜４２で構成されている。尚、ここで使用する抵
抗線４１は第１実施例で示した抵抗線３１と同様のもの
を使用することができる。従って、抵抗線４１の詳細な
説明は省略する。Next, a second embodiment will be explained based on FIGS. 3 and 4. FIG. 3 is a sectional view showing the main part of the welded joint of this embodiment, and FIG. 4 is a further enlarged view of the main part.
It is an insulated resistance wire. This insulated resistance wire 4 is composed of a resistance wire 41 and an insulating film 42. Note that the resistance wire 41 used here can be the same as the resistance wire 31 shown in the first embodiment. Therefore, detailed explanation of the resistance wire 41 will be omitted.
【００２２】前記絶縁皮膜４２は、前記抵抗線４１の外
周に設けられ、耐熱性がＦ種以上の絶縁ワニス４２１に
熱伝導率の良好な無機充填剤４２２を添加してなる微粒
子分散型絶縁ワニスを均一厚さに塗布焼付して形成され
ている。耐熱性がＦ種以上の絶縁ワニス４２１としては
、ポリイミドワニス、ポリエステルイミドワニス、ポリ
アミドイミドワニス等がある。また、無機充填剤４２２
としては、窒化ホウ素、酸化ナタン、雲母粉末、ガラス
粉末、石英ガラス粉末、炭酸カルシウム等がある。The insulating film 42 is provided around the outer periphery of the resistance wire 41, and is made of a fine particle dispersed insulating varnish 421 having a heat resistance of class F or higher and an inorganic filler 422 having good thermal conductivity added thereto. It is formed by coating and baking to a uniform thickness. Examples of the insulating varnish 421 having heat resistance of class F or higher include polyimide varnish, polyesterimide varnish, polyamideimide varnish, and the like. In addition, inorganic filler 422
Examples include boron nitride, natanium oxide, mica powder, glass powder, quartz glass powder, calcium carbonate, and the like.
【００２３】抵抗線４１の外周に絶縁皮膜４２を形成す
る方法としては、例えば、ポリエステルイミドワニス５
ｋｇと、粒子径が１０μｍになるまで粉砕された窒化ホ
ウ素７ｋｇを、ボールミル容器に投入して５時間混合し
、この混合により生成された無機充填剤分散型の絶縁ワ
ニスを抵抗線４１に７〜８回に分けて塗布し、４００〜
５００℃の焼付乾燥炉で焼付乾燥して絶縁皮膜４２を形
成する方法がある。尚、絶縁皮膜４２の膜厚は、抵抗線
４１の線径が０．８ｍｍの場合に、１５μｍ程度にする
ことが好ましい。As a method for forming the insulating film 42 on the outer periphery of the resistance wire 41, for example, polyester imide varnish 5
kg and 7 kg of boron nitride, which has been ground to a particle size of 10 μm, are placed in a ball mill container and mixed for 5 hours. Divide into 8 coats, apply 400~
There is a method of forming the insulating film 42 by baking and drying in a baking drying oven at 500°C. The thickness of the insulating film 42 is preferably about 15 μm when the wire diameter of the resistance wire 41 is 0.8 mm.
【００２４】抵抗線４１に通電してプラスチック管を接
続する時に、本実施例の溶着継手にあっては、絶縁抵抗
線４が上述のように構成されているため、抵抗線４１の
発熱時に絶縁皮膜４２によって熱伝導が遮られることな
く抵抗線４１の線間における短絡を防止することができ
る。従って、継手本体１を形成する樹脂への熱放散性が
良好になり、抵抗線４１の発熱を効率よく樹脂の溶融に
利用することができ、経済的である。When the resistance wire 41 is energized to connect the plastic pipe, in the welded joint of this embodiment, since the insulated resistance wire 4 is constructed as described above, the insulation is removed when the resistance wire 41 generates heat. The film 42 can prevent short circuits between the resistance wires 41 without interrupting heat conduction. Therefore, the heat dissipation to the resin forming the joint body 1 is improved, and the heat generated by the resistance wire 41 can be efficiently used to melt the resin, which is economical.
【００２５】以上、本発明の実施例を図面により詳述し
てきたが、具体的な構成はこの実施例に限られるもので
はなく、本発明の要旨を逸脱しない範囲における設計の
変更等があっても本発明に含まれる。例えば、実施例で
は、継手本体が円筒状に形成された溶着継手（ソケット
）を示したが、本実施例の絶縁抵抗線は、継手本体がサ
ドル状に形成されていると共に分岐部が形成されている
溶着継手（分岐サドル，サービスチー）や、継手本体が
Ｌ字形の筒状に形成された（エルボ）や、継手本体がＹ
字形あるいはＴ字形の筒状に形成された溶着継手（チー
ズ）や、継手本体が異径の開口端を有する円筒状に形成
された溶着継手（レジューサ）等に採用してもよい。
また、実施例では絶縁抵抗線を円筒状の継手本体の内周
部にコイル状に埋設させた例を示したが、絶縁抵抗線の
埋設状態は実施例に限られず、例えば、分岐サドルやサ
ービスチーのサドル部内面に埋設させる場合には渦巻状
に埋設させることになる。Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design may be changed without departing from the gist of the present invention. are also included in the present invention. For example, in the example, a welded joint (socket) is shown in which the joint body is formed in a cylindrical shape, but in the insulated resistance wire of this example, the joint body is formed in a saddle shape and a branch part is formed. Welded joints (branch saddle, service tee), joints whose body is formed into an L-shaped cylinder (elbow), and joints whose body is Y-shaped (elbow),
It may be employed in a welded joint (cheese) formed in a cylindrical shape or T-shape, or a welded joint (reducer) in which the joint body is formed in a cylindrical shape with an open end having a different diameter. In addition, although the example shows an example in which the insulation resistance wire is buried in a coil shape in the inner circumference of the cylindrical joint body, the buried state of the insulation resistance wire is not limited to the example. When it is buried in the inner surface of the saddle part of the Qi, it is buried in a spiral shape.
【００２６】[0026]
【発明の効果】上述のように構成したため、本発明の溶
着継手用の絶縁抵抗線は、次のような効果が得られる。
まず、請求項１及び２記載の溶着継手用の絶縁抵抗線に
あっては、抵抗線の発熱時に絶縁皮膜によって熱伝導が
遮られることがなくなるので、溶着継手に埋設させた場
合、その溶着継手を形成する樹脂への熱放散性が良好で
ある。従って、抵抗線の発熱を効率よく樹脂の溶融に利
用することができ、経済的であるという効果が得られる
。[Effects of the Invention] Since the structure is as described above, the insulated resistance wire for a welded joint of the present invention has the following effects. First, in the insulated resistance wire for a welded joint according to claims 1 and 2, when the resistance wire generates heat, heat conduction is not blocked by the insulating film, so when buried in a welded joint, the welded joint It has good heat dissipation properties to the resin that forms it. Therefore, the heat generated by the resistance wire can be efficiently used to melt the resin, resulting in an economical effect.
【００２７】また、請求項３記載の溶着継手用の絶縁抵
抗線にあっては、表面の接着力が強化されるので、溶着
継手に埋設させた場合、その溶着継手を形成する樹脂と
の密着性が向上する。従って、抵抗線の過熱による樹脂
の劣化や融着性能の低下を解消することができるという
効果が得られる。In addition, since the insulated resistance wire for a welded joint according to claim 3 has strengthened adhesive force on the surface, when buried in a welded joint, it will not adhere tightly to the resin forming the welded joint. Improves sex. Therefore, the effect of being able to eliminate the deterioration of the resin and the deterioration of the fusion performance due to overheating of the resistance wire can be obtained.
【図１】本発明第１実施例の溶着継手を示す断面図であ
る。FIG. 1 is a sectional view showing a welded joint according to a first embodiment of the present invention.
【図２】前記溶着継手の要部拡大図である。FIG. 2 is an enlarged view of main parts of the welded joint.
【図３】本発明第２実施例の溶着継手用の要部を示す断
面図である。FIG. 3 is a sectional view showing the main parts of a welded joint according to a second embodiment of the present invention.
【図４】前記溶着継手の要部拡大図である。FIG. 4 is an enlarged view of main parts of the welded joint.
１ 継手本体 ２ ターミナルピン ３ 絶縁導電線 ３１ 抵抗線 ３２ 絶縁皮膜 ３３ 接着皮膜 ４ 絶縁抵抗線 ４１ 抵抗線 ４２ 絶縁皮膜 ４２１ 絶縁ワニス ４２２ 無機充填剤 1 Joint body 2 Terminal pin 3 Insulated conductive wire 31 Resistance wire 32 Insulating film 33 Adhesive film 4 Insulated resistance wire 41 Resistance wire 42 Insulating film 421 Insulating varnish 422 Inorganic filler
Claims (3)
ている溶着継手用の絶縁抵抗線において、前記絶縁皮膜
が、耐熱性がＦ種以上の絶縁ワニスに熱伝導率の良好な
無機充填剤を添加してなる微粒子分散型絶縁ワニスを均
一厚さに塗布焼付して形成されていることを特徴とする
溶着継手用の絶縁抵抗線。1. An insulated resistance wire for a welded joint in which an insulating film is provided on the outer periphery of a bare resistance wire, wherein the insulating film is an insulating varnish with a heat resistance of class F or higher and an inorganic filler with good thermal conductivity. An insulated resistance wire for a welded joint, characterized in that it is formed by applying and baking a fine particle-dispersed insulating varnish with a uniform thickness.
ある請求項２記載の溶着継手用の絶縁抵抗線。2. The insulated resistance wire for a welded joint according to claim 2, wherein the inorganic filler has a particle size of 15 μm or less.
ている溶着継手用の絶縁抵抗線において、前記絶縁皮膜
が、耐熱性がＦ種以上の絶縁ワニスを均一厚さに塗布焼
付して形成され、該絶縁皮膜の外周に、エチレンを主体
としたビニル共重合体からなる樹脂溶液を塗布焼付して
形成した接着皮膜が設けられていることを特徴とする溶
着継手用の絶縁抵抗線。3. In an insulated resistance wire for a welded joint in which an insulating film is provided on the outer periphery of a bare resistance wire, the insulating film is formed by applying and baking an insulating varnish having a heat resistance of class F or higher to a uniform thickness. An insulated resistance wire for a welded joint, characterized in that an adhesive film formed by applying and baking a resin solution made of a vinyl copolymer mainly composed of ethylene is provided on the outer periphery of the insulating film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3116021A JPH04347094A (en) | 1991-05-21 | 1991-05-21 | Insulation resistance wire for deposited joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3116021A JPH04347094A (en) | 1991-05-21 | 1991-05-21 | Insulation resistance wire for deposited joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04347094A true JPH04347094A (en) | 1992-12-02 |
Family
ID=14676825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3116021A Pending JPH04347094A (en) | 1991-05-21 | 1991-05-21 | Insulation resistance wire for deposited joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04347094A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06185688A (en) * | 1992-12-17 | 1994-07-08 | Hitachi Metals Ltd | Heating plate |
| JPH11514599A (en) * | 1995-10-30 | 1999-12-14 | コンピュークラフト リミテッド | Electric fusion saddle coupler and method and apparatus for manufacturing electric fusion saddle coupler |
| JP2007307906A (en) * | 2006-05-17 | 2007-11-29 | Gaz De France | Apparatus and method for welding two polymer parts together through melting |
| EP3147104A1 (en) * | 2015-09-25 | 2017-03-29 | Berkenhoff GmbH | Use of a resistance wire provided with an insulation layer for an electric welding sleeve |
-
1991
- 1991-05-21 JP JP3116021A patent/JPH04347094A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06185688A (en) * | 1992-12-17 | 1994-07-08 | Hitachi Metals Ltd | Heating plate |
| JPH11514599A (en) * | 1995-10-30 | 1999-12-14 | コンピュークラフト リミテッド | Electric fusion saddle coupler and method and apparatus for manufacturing electric fusion saddle coupler |
| JP2007307906A (en) * | 2006-05-17 | 2007-11-29 | Gaz De France | Apparatus and method for welding two polymer parts together through melting |
| EP3147104A1 (en) * | 2015-09-25 | 2017-03-29 | Berkenhoff GmbH | Use of a resistance wire provided with an insulation layer for an electric welding sleeve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A912 | Re-examination (zenchi) completed and case transferred to appeal board |
Free format text: JAPANESE INTERMEDIATE CODE: A912 Effective date: 20060428 |