JPH0241219A - Inner face corrosionproof tube joint and manufacture thereof - Google Patents
Inner face corrosionproof tube joint and manufacture thereofInfo
- Publication number
- JPH0241219A JPH0241219A JP19237088A JP19237088A JPH0241219A JP H0241219 A JPH0241219 A JP H0241219A JP 19237088 A JP19237088 A JP 19237088A JP 19237088 A JP19237088 A JP 19237088A JP H0241219 A JPH0241219 A JP H0241219A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- layer
- adhesive layer
- pipe joint
- coating
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 229920005989 resin Polymers 0.000 claims abstract description 52
- 239000011347 resin Substances 0.000 claims abstract description 52
- 239000012790 adhesive layer Substances 0.000 claims abstract description 40
- 239000011247 coating layer Substances 0.000 claims abstract description 23
- 238000000576 coating method Methods 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 8
- 238000005260 corrosion Methods 0.000 claims description 21
- 230000007797 corrosion Effects 0.000 claims description 20
- 230000001070 adhesive effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 abstract description 6
- 239000012943 hotmelt Substances 0.000 abstract description 5
- 230000000873 masking effect Effects 0.000 abstract description 5
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 description 5
- 238000007667 floating Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007610 electrostatic coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000010935 stainless steel Substances 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14311—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using means for bonding the coating to the articles
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14598—Coating tubular articles
- B29C45/14622—Lining the inner or outer surface of tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2715/00—Condition, form or state of preformed parts, e.g. inserts
- B29K2715/006—Glues or adhesives, e.g. hot melts or thermofusible adhesives
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は内面防食管継手に関し、特に管継手とその内
面に形成した樹脂被覆層とを接着する接着層を有する内
面防食管継手に関し、更に詳しくは該接着層の形成手段
に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an internally corrosion-resistant pipe joint, and more particularly to an internally corrosion-resistant pipe joint having an adhesive layer that adheres a pipe joint and a resin coating layer formed on its inner surface, More specifically, the present invention relates to a means for forming the adhesive layer.
［従来の技術］
管内面の防食対策として内面防食鋼管が使用されるに従
って、内面防食管継手の需要も高まってきたが、エルボ
、チーズ、ソケットなどの管継手の内面に樹脂被覆層を
射出成形しただけの内面防食管継手では、管を管継手に
嵌入したときに樹脂被覆層が管継手内面よりｈａｔ、易
いという問題がある。そこで管継手内面と該内面に形成
する樹脂被覆層との間に接着層を形成する構成が開発さ
れているが、従来の接着層においては、その材料は遅乾
性の液状接着剤であり、またその形成手段は塗布によっ
ていた（実公昭４０−１５７３５．特閏昭６２−［発明
が解決しようとする課１１１
上記従来の接着層は液状の接着剤を塗布することによっ
て形成・していたから、施工性が著しく悪く、接着層を
有する内面防食管継手を迅速・多量に製造することが困
難であった。また塗布による接着力は十分でなく均質な
接着層を得ることも困難であったから、樹脂被覆層と管
継手内面との接着性が必ずしも十分ではなかった。[Conventional technology] As internally corrosion-resistant steel pipes are used as a measure to prevent corrosion on the inside of pipes, the demand for internally corrosion-resistant pipe fittings has increased. A problem with a pipe joint with only a corrosion-resistant inner surface is that when the pipe is inserted into the pipe joint, the resin coating layer is more likely to corrode than the inner surface of the pipe joint. Therefore, a structure has been developed in which an adhesive layer is formed between the inner surface of the pipe joint and the resin coating layer formed on the inner surface, but in the conventional adhesive layer, the material is a slow-drying liquid adhesive; The means of forming it was by coating (Utility Model Publication No. 40-15735, Special Publication No. 62-[Issues to be Solved by the Invention 111] Since the above-mentioned conventional adhesive layer was formed by applying a liquid adhesive, it was easy to apply. This made it difficult to quickly and produce large quantities of corrosion-resistant pipe fittings with an adhesive layer on the inside.Furthermore, the adhesive strength by coating was insufficient and it was difficult to obtain a homogeneous adhesive layer. Adhesion between the layer and the inner surface of the pipe joint was not always sufficient.
［課題を解決するための手段］
本発明は上記課題を解決するために成されたものであり
、すなわち本発明の請求項１は、金属製管継手の内面に
接着層を形成し、該接着層の内面に熱可塑性樹脂を射出
して樹脂被覆層を形成した内面防食管継手において、前
記接着層を、金属との接着性を有する粉末樹脂を粉体コ
ーティング法によってコーティングして形成したことを
特徴とする内面防食管継手であり、請求項２は、金属製
管継手の内面に接着層を形成する工程と、該接着層の内
面に熱可塑性樹脂を射出して樹脂被覆層を形成する工程
とからなる内面防食管継手の製法において、前記接着層
の形成を、金属との接着性を有する粉末樹脂を粉体コー
ティング法によってコーティングしたことを特徴とする
内面防食管継手の製法である。[Means for Solving the Problems] The present invention has been made to solve the above problems, that is, claim 1 of the present invention is to form an adhesive layer on the inner surface of a metal pipe joint, In an internal corrosion-resistant pipe joint in which a resin coating layer is formed by injecting a thermoplastic resin onto the inner surface of the layer, the adhesive layer is formed by coating a powdered resin that has adhesive properties with metal using a powder coating method. A second aspect of the invention is an internally corrosion-resistant pipe joint, comprising: a step of forming an adhesive layer on the inner surface of the metal pipe joint; and a step of injecting a thermoplastic resin onto the inner surface of the adhesive layer to form a resin coating layer. A method for manufacturing an internally corrosion-resistant pipe joint comprising: forming the adhesive layer by coating a powdered resin that has adhesive properties with metal by a powder coating method.
［作用］
金属との接着性を有する粉末樹脂は、粉体コーティング
法によって管継手内面に容易・迅速・均質にコーティン
グされて接着層を形成し、該接着層の内面に熱可塑性樹
脂を射出して樹脂被覆層を形成したときに該樹脂被覆層
の熱によって接着層と樹脂被覆層とは密着し、したがっ
て接着層によって管継手内面と樹脂被覆層とは強固に接
着され。[Function] Powdered resin that has adhesive properties with metal is coated easily, quickly, and homogeneously on the inner surface of the pipe joint using a powder coating method to form an adhesive layer, and then thermoplastic resin is injected onto the inner surface of the adhesive layer. When the resin coating layer is formed, the adhesive layer and the resin coating layer are brought into close contact with each other by the heat of the resin coating layer, so that the inner surface of the pipe joint and the resin coating layer are firmly adhered by the adhesive layer.
管を管継手に嵌入したときに樹脂被覆層が管継手内面よ
りＰｑ′Ｈすることがない。When the pipe is inserted into the pipe joint, the resin coating layer does not become Pq'H higher than the inner surface of the pipe joint.
［実施例］
本発明の実施例を図面によって説明する。第１図は本発
明の防食管継手の一実施例の縦断面図であり、同図にお
いて１は管継手であり、図では管継手１がエルボである
ときを示すが、チーズ、ソケットなどの管継手であって
もよい、２は管継手１の内面に形成した接着層であり、
金属との接着性を有する粉末樹脂を粉体コーティング法
によってコーティングして形成しである６３は接着層２
の内面に形成した樹脂被覆層であり、該樹脂被覆層３は
接着層２を形成した後に、管継手の開口端より金型を挿
入し、該金型を通じて熱可塑性の樹脂を射出成形するこ
とによって形成しである。[Example] An example of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal cross-sectional view of one embodiment of the anti-corrosion pipe joint of the present invention. In the figure, 1 is a pipe joint. In the figure, the pipe joint 1 is an elbow, but it can also be used for cheese, socket, etc. 2 is an adhesive layer formed on the inner surface of the pipe joint 1, which may be a pipe joint;
The adhesive layer 2 63 is formed by coating a powdered resin that has adhesive properties with metal using a powder coating method.
The resin coating layer 3 is a resin coating layer formed on the inner surface of the pipe joint, and after forming the adhesive layer 2, a mold is inserted from the open end of the pipe joint, and a thermoplastic resin is injection molded through the mold. It is formed by
接着層２は粉体コーティング法によって形成するが、該
粉体コーティング法には一般に２つの方法があり、第１
の方法は静電塗装法と呼ばれるものである。これは粉体
を負にイオン化し、金属を正電位にして電流を流して金
属表面に粉体をくっつけ、その後静かに加熱炉内に入れ
て １５０〜２００℃に加熱して焼き付ける方法である
。第２の方法は流動浸漬法と呼ばれるものであり、これ
は槽内に粉体を入れ、下部より空気等を送って粉体を槽
内で浮遊流動させておき、この槽内に加熱した金属を入
れると金属表面に浮遊粉体がくっついて溶けて均一にコ
ーティングされ、これを再度１５０〜２００℃に加熱し
て焼き付ける方法である。The adhesive layer 2 is formed by a powder coating method, and there are generally two methods for the powder coating method.
This method is called electrostatic coating method. This is a method in which the powder is negatively ionized, the metal is set to a positive potential, a current is applied to the metal surface, the powder sticks to the metal surface, and then the powder is gently placed in a heating furnace and heated to 150-200°C to bake. The second method is called the fluidized immersion method, in which powder is placed in a tank, air etc. is sent from the bottom to make the powder float and flow in the tank, and heated metal is placed in the tank. The floating powder sticks to the metal surface and melts to form a uniform coating, which is then heated again to 150-200°C and baked.
接着層２の形成はこれらのいずれの方法によってもよい
が、粉体としては金属との接着性を有する粉末樹脂を使
用し、そのような粉末樹脂としては、ポリアミド系、ポ
リエステル系、エチレン酢酸ビニルコポリマー系などの
ホットメルト樹脂をあげることができる。The adhesive layer 2 may be formed by any of these methods, but the powder used is a powdered resin that has adhesive properties with metals, and such powdered resins include polyamide, polyester, ethylene vinyl acetate, etc. Examples include hot-melt resins such as copolymer-based resins.
本実施例では流動浸漬法によっており、第２図に示すよ
うに、槽５内に設けた多孔板６の上部に融点が９０〜１
１０℃のポリエステル系のホットメルト粉末樹脂４を入
れ、多孔板６の下部より空気７を吹き込んで粉末樹脂４
を浮遊流動状態にし、該粉末樹脂４を導管８とマスキン
グ治具９を通じて１４０〜１５０℃に加熱した管継手１
の一方の開口端に導き、管継手１の他方の開口端に取付
けた別のマスキング治具１０の曲端に吸引源（図示せず
）を取付け、こうして粉末樹脂４を管継手１の内面のう
ち、マスキング治具９．１０によってマスクされたねじ
部具外の内面にコーティングして接着層２を形成する。In this embodiment, a fluidized dipping method is used, and as shown in FIG. 2, a melting point of 90 to 1
A polyester-based hot melt powder resin 4 at 10° C. is added, and air 7 is blown from the bottom of the perforated plate 6 to melt the powder resin 4.
A pipe joint 1 is prepared by bringing the resin into a floating fluid state and heating the powdered resin 4 to 140 to 150°C through a conduit 8 and a masking jig 9.
A suction source (not shown) is attached to the curved end of another masking jig 10 attached to the other open end of the pipe fitting 1, and the powder resin 4 is thus drawn onto the inner surface of the pipe fitting 1. The adhesive layer 2 is formed by coating the outer inner surface of the threaded part that is masked by the masking jig 9 and 10.
しかるｔ＆熱可塑性の樹脂を接着層２の内面に射出成形
して樹脂被覆層３を形成するが、金型に入る樹脂の温度
を粉末樹脂の融点よりも７０〜１００°Ｃ高くして射出
成形すると、成形樹脂の温度によってホットメルト樹脂
が溶けて成形樹脂と一体に接着され、こうして樹脂被覆
層３は接着層２を介して管継手１内面に接着される。However, the resin coating layer 3 is formed by injection molding a thermoplastic resin on the inner surface of the adhesive layer 2, but the temperature of the resin entering the mold is set to be 70 to 100°C higher than the melting point of the powdered resin. Then, the hot melt resin melts due to the temperature of the molding resin and is bonded together with the molding resin, and thus the resin coating layer 3 is bonded to the inner surface of the pipe joint 1 via the adhesive layer 2.
以上のようにして形成した本実施例の内面防食管継手を
従来品と比べると、第１に従来品は接着剤を塗布してい
たのに対して本実施例では金属との接着性を有する粉末
樹脂を粉体コーティング法によってコーティングしであ
るから、従来品と比べて接着力が格段に強い。第２に従
来品の接着層の厚さは約１０〜２０μと薄かったのに対
して本実施例では５０〜５００μと厚く均質な接着層が
得られ。Comparing the internal corrosion-resistant pipe joint of this example formed as described above with a conventional product, firstly, the conventional product was coated with adhesive, whereas this example has adhesive properties with metal. Since it is coated with powdered resin using the powder coating method, it has much stronger adhesion than conventional products. Secondly, whereas the thickness of the adhesive layer of the conventional product was as thin as about 10 to 20 μm, in this embodiment, a thick and homogeneous adhesive layer of 50 to 500 μm was obtained.
かつその厚さを自在に制御することができ、この結果万
一樹脂被覆層が＠損したとしても接着層が樹脂被覆層の
バックアップとしてＩ！能する。したがって従来品は実
質的に２重被覆とはいえなかったのに対して本実施例は
実質的に２重披＋’ｖｉ造となっており、防食上の信頼
性が向上している。第３に従来品では接着層の形成に手
間を要していたが１本実施例では施工性が著しく改善さ
れている。Moreover, its thickness can be freely controlled, and as a result, even if the resin coating layer is damaged, the adhesive layer can act as a backup for the resin coating layer. function. Therefore, whereas the conventional product could not be said to have a substantially double coating, this embodiment has a substantially double coating structure, which improves reliability in terms of corrosion protection. Thirdly, in the conventional product, it took time and effort to form the adhesive layer, but in this embodiment, the workability is significantly improved.
「発明の効果］
本発明によって内面防食管継手の接着層は、接着力が強
くかつ厚く均質に形成されるから、該接着層を介して樹
脂被覆層は管継手内面に強固に接着されて樹脂被覆層が
剥離することがなく、かつ実質的に２重被覆構造に形成
されて防食上の信頼性が増す６また本接着層は容易・迅
速に形成することができるから、内面防食管継手の製造
において接着層の形成工程がクリティカルパスとなるこ
とがない。"Effects of the Invention" According to the present invention, the adhesive layer of the internal corrosion-resistant pipe joint is formed to have a strong adhesive force, thick and homogeneous, so that the resin coating layer is firmly adhered to the inner surface of the pipe joint via the adhesive layer, and The coating layer does not peel off and is formed into a substantially double coating structure, increasing reliability in terms of corrosion protection6.Furthermore, since this adhesive layer can be formed easily and quickly, it is suitable for internally corrosion-resistant pipe joints. The process of forming an adhesive layer does not become a critical path in manufacturing.
第１（２１は、本発明に係る内面防食管継手の一実施例
の縦断面図、第２図は同管継手の製造方法の一実施例の
要部を示す説明図である。
１・・管継手 ２・・・接着層 ３・・・樹脂被
覆層４・・・ホｙ ）メルト粉末樹脂The first (21) is a vertical cross-sectional view of an embodiment of the internal corrosion-resistant pipe joint according to the present invention, and FIG. Pipe fitting 2...Adhesive layer 3...Resin coating layer 4...Hoy) Melt powder resin
Claims (2)
の内面に熱可塑性樹脂を射出して樹脂被覆層を形成した
内面防食管継手において、前記接着層を、金属との接着
性を有する粉末樹脂を粉体コーティング法によってコー
ティングして形成したことを特徴とする内面防食管継手
。(1) In an inner corrosion-resistant pipe joint in which an adhesive layer is formed on the inner surface of the metal pipe joint, and a resin coating layer is formed by injecting a thermoplastic resin onto the inner surface of the adhesive layer, the adhesive layer is bonded to the metal. 1. An inner corrosion-resistant pipe joint characterized in that it is formed by coating a powdered resin with corrosion resistance using a powder coating method.
該接着層の内面に熱可塑性樹脂を射出して樹脂被覆層を
形成する工程とからなる内面防食管継手の製法において
、前記接着層の形成を、金属との接着性を有する粉末樹
脂を粉体コーティング法によつてコーティングしたこと
を特徴とする内面防食管継手の製法。(2) forming an adhesive layer on the inner surface of the metal pipe joint;
In a manufacturing method for an internal corrosion-resistant pipe joint, which comprises a step of injecting a thermoplastic resin onto the inner surface of the adhesive layer to form a resin coating layer, the formation of the adhesive layer is performed by injecting a powdered resin that has adhesive properties with metal into powder. A method for manufacturing an internal corrosion-resistant pipe joint characterized by coating it by a coating method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19237088A JPH0241219A (en) | 1988-08-01 | 1988-08-01 | Inner face corrosionproof tube joint and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19237088A JPH0241219A (en) | 1988-08-01 | 1988-08-01 | Inner face corrosionproof tube joint and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0241219A true JPH0241219A (en) | 1990-02-09 |
Family
ID=16290156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19237088A Pending JPH0241219A (en) | 1988-08-01 | 1988-08-01 | Inner face corrosionproof tube joint and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0241219A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5498992A (en) * | 1992-04-30 | 1996-03-12 | Hewlett-Packard Company | Unity gain positive feedback integrator with programmable charging currents and polarities |
| WO2000059990A1 (en) * | 1999-04-02 | 2000-10-12 | Basell Technology Company Bv | Coupling metal parts with a plastic material |
| EP2505330A1 (en) * | 2011-03-28 | 2012-10-03 | Dizayn Grup Teknoloji Arastirma ve Gelistirme San. Tic. A.S. | Fitting elements or piping units having improved adherence to plastic material |
-
1988
- 1988-08-01 JP JP19237088A patent/JPH0241219A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5498992A (en) * | 1992-04-30 | 1996-03-12 | Hewlett-Packard Company | Unity gain positive feedback integrator with programmable charging currents and polarities |
| WO2000059990A1 (en) * | 1999-04-02 | 2000-10-12 | Basell Technology Company Bv | Coupling metal parts with a plastic material |
| US6893590B1 (en) | 1999-04-02 | 2005-05-17 | Basell Poliolefine Italia S.P.A. | Coupling metal parts with a plastic material |
| EP2505330A1 (en) * | 2011-03-28 | 2012-10-03 | Dizayn Grup Teknoloji Arastirma ve Gelistirme San. Tic. A.S. | Fitting elements or piping units having improved adherence to plastic material |
| WO2012130833A1 (en) * | 2011-03-28 | 2012-10-04 | Dizayn Grup Teknoloji Arastirma Ve Gelistirme San. Tic. A.S. | Fitting elements or piping units having improved adherence to plastic material |
| EA025682B1 (en) * | 2011-03-28 | 2017-01-30 | Дизайн Груп Текноложи Арастирма Ве Гелистирме Сан. Тидж. А.Ш. | Fitting elements or piping units having improved adherence to plastic materials |
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