JPH0757503B2 - Anticorrosion pipe fittings - Google Patents
Anticorrosion pipe fittingsInfo
- Publication number
- JPH0757503B2 JPH0757503B2 JP3241621A JP24162191A JPH0757503B2 JP H0757503 B2 JPH0757503 B2 JP H0757503B2 JP 3241621 A JP3241621 A JP 3241621A JP 24162191 A JP24162191 A JP 24162191A JP H0757503 B2 JPH0757503 B2 JP H0757503B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe joint
- main body
- melt adhesive
- inner peripheral
- hot melt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0097—Glues or adhesives, e.g. hot melts or thermofusible adhesives
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】 本発明は樹脂層が金属製管継手
本体の略中央部内周面に設けられた防食管継手に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion pipe joint in which a resin layer is provided on an inner peripheral surface of a metal pipe joint body at a substantially central portion.
【０００２】[0002]
【従来の技術】 従来、防食管継手としては、例えば、
実公昭４０−１５７３５号公報に記載（図４参照）の如
く、糊着剤２’を塗布せる中央部が膨出し両端部が延在
した防食可塑質の筒状薄肉接続体１’の膨出部を継手
４’内部に挿入の上、上記接続体１’の両端部を接続す
べき内面防食を施したねじ込み管３’，３’の各開口部
に挿入するようにしたものが提案されている。2. Description of the Related Art Conventionally, as an anticorrosion pipe joint, for example,
As described in Japanese Utility Model Publication No. 40-15735 (see FIG. 4), the swelling of the cylindrical thin-walled connector 1'of the anticorrosion plastic having the central part swelling and the both ends extending to which the adhesive 2'is applied. It has been proposed to insert the parts into the joint 4'and then insert the ends of the connector 1'into the respective openings of the internally corroded screw-in pipes 3'and 3'to be connected. There is.
【０００３】[0003]
【発明が解決しようとする課題】 しかし、叙上の如き
従来のものは、別途成形した筒状薄肉接続体１’を糊着
剤２’を介して継手４’の内部に接着するものであるの
で、筒状薄肉接続体１’の継手内部に対する接着力が充
分でなく、ねじ込み管３’，３’を開口部に挿入すると
き、継手４’内部から筒状薄肉接続体１’が離脱して、
継手４’内部を充分に企ることができないという欠点が
あり、また、筒状薄肉接続体１’を糊着剤２’を介して
継手４’内部に接着して、防食管継手を製造する作業が
煩雑であるという欠点があった。However, in the conventional one as described above, the separately molded tubular thin-walled connector 1'is bonded to the inside of the joint 4'via the adhesive 2 '. Therefore, the adhesive force of the tubular thin-walled connector 1'with respect to the inside of the joint is not sufficient, and when the screwed pipes 3 ', 3'are inserted into the openings, the tubular thin-walled connector 1'removes from the inside of the joint 4'. hand,
There is a drawback that the inside of the joint 4'cannot be sufficiently planned, and the thin tubular connector 1'is bonded to the inside of the joint 4'via the adhesive 2'to manufacture an anticorrosion pipe joint. There was a drawback that the work was complicated.
【０００４】本発明は、叙上の如き従来の欠点を解消す
ることを目的としてなされたものである。The present invention has been made for the purpose of eliminating the above-mentioned conventional drawbacks.
【０００５】[0005]
【課題を解決するための手段】 本発明の要旨は、略中
央部内周面に凹部を有し、両端部近傍内周面に雌ねじ部
を有する金属製管継手本体と、該凹部全面にホットメル
ト接着剤を介して射出成型により設けられた本体の凹部
内方に突出した環状の樹脂ライニング層とからなる防食
管継手に存し、これにより叙上の目的が達せられる。Means for Solving the Problems The gist of the present invention is to provide a metal pipe joint main body having a concave portion on the inner peripheral surface of the substantially central portion and female thread portions on the inner peripheral surfaces near both ends, and hot melt on the entire surface of the concave portion. It exists in an anticorrosion pipe joint consisting of an annular resin lining layer protruding inward of the recess of the main body, which is provided by injection molding via an adhesive, and thereby achieves the above purpose.
【０００６】[0006]
【作用】 本発明の防食管継手においては、ホットメル
ト接着剤層を介して金属製管継手本体の略中央部内周面
の凹部全面に本体の凹部内方に突出した環状の樹脂ライ
ニング層が接着されるので、金属製管継手本体とホット
メルト接着剤層及びホットメルト接着剤層と樹脂ライニ
ング層とが、広い接着面によって強固に接着される。In the anticorrosion pipe joint of the present invention, the annular resin lining layer protruding inward of the recess of the main body is adhered to the entire recess of the inner peripheral surface of the metal pipe joint main body through the hot melt adhesive layer. Therefore, the metal pipe joint body and the hot melt adhesive layer, and the hot melt adhesive layer and the resin lining layer are firmly bonded to each other by the wide bonding surface.
【０００７】また、金属性管継手本体の凹部内方に突出
した環状の樹脂ライニング層が設けられているので、こ
の継手に螺合接合される管はこの突出部に当接して過度
のねじ込みが防止される。Further, since the annular resin lining layer projecting inwardly of the concave portion of the metallic pipe joint body is provided, the pipe screw-joined to this joint abuts against this projecting portion and is not excessively screwed. To be prevented.
【０００８】[0008]
【実施例】 以下、本発明を実施例により図面を参照し
て説明する。図１は本発明防食管継手の実施例を示す断
面図である。１はソッケト型の金属製管継手本体であっ
て、両開口部１１，１２の内周面に雌ねじ部１１１，１
２１が設けられ、その奥部内周面、つまり管継手本体１
の略中央部内周面に凹部１３が設けられている。EXAMPLES Hereinafter, the present invention will be described by way of examples with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the anticorrosion pipe joint of the present invention. Reference numeral 1 is a socket type metal pipe joint main body, and internal thread portions 111, 1 are formed on the inner peripheral surfaces of both openings 11, 12.
21 is provided and the inner peripheral surface of the inner part thereof, that is, the pipe joint body 1
A concave portion 13 is provided on the inner peripheral surface of the substantially central portion.
【０００９】１４はポリアミド系、ポリエステル系等の
ホットメルト接着剤からなるホットメルト接着剤層であ
り、本体１の略中央部内周面の凹部１３上全面に設けら
れている。Reference numeral 14 denotes a hot-melt adhesive layer made of a hot-melt adhesive such as a polyamide-based or polyester-based adhesive, which is provided on the entire surface of the recess 13 on the inner peripheral surface of the main body 1.
【００１０】１５は樹脂ライニング層である。このライ
ニング層１５は本体の凹部１３の内方に環状に突出して
設けられている。射出成型により樹脂ライニング層１５
はホットメルト接着剤層１４を介して本体１１の凹部１
３に強固に接着されている。Reference numeral 15 is a resin lining layer. The lining layer 15 is provided so as to project annularly inside the recess 13 of the main body. Resin lining layer 15 by injection molding
Is the concave portion 1 of the main body 11 via the hot melt adhesive layer 14.
3 is firmly adhered.
【００１１】図２は本発明防食管継手の製造方法を説明
する断面図である。本体１の凹部１３上にホットメルト
接着剤を粉末又は溶液の状態で塗布する。この本体１の
一開口端部１１に筒状のインサート２を螺合し、その開
口端面にインサート２の鍔部２３の内側面を当接する。
インサート２の先端面は凹部１３の端に一致する垂直面
となされている。インサート２の筒部２１内に、スライ
ドコアー３を柱部３１が筒部２１内周面と各部で所定間
隙３３を形成し、その先端が筒部２１よりも突出する如
く挿着する。本体１の他開口端部１２に閉塞具４のイン
サート閉塞具４１を螺合してその開口端部を閉塞する。
また閉塞具４のスライドコアー閉塞具４２の柱部４２１
の先端面にスライドコアー３の柱部３１の先端面を当接
する。そして、本体１の略中央部内周面のホットメルト
接着剤を塗布した凹部１３とインサート２の筒部２１の
先端面と、スライドコアー３の柱部３１の先端面と、閉
塞具４とで囲まれた環状空所中へ、スライドコアー３と
インサート２で形成される樹脂流路、すなわち案内溝３
２２、凹溝３２１、間隙３３により構成される樹脂流路
を通して射出成型により樹脂を射出し、そのときの樹脂
熱により本体１の略中央部内周面の凹部１３上に塗布し
たホットメルト接着剤を溶融して、本体１の略中央部内
周面の凹部１３上にホットメルト接着剤層１４を介して
樹脂ライニング層１５を接着せしめる。しかる後、本体
１からインサート２、スライドコアー３及び閉塞具４を
抜去して、射出成型による樹脂ライニング層１５が本体
１の凹部１３にホットメルト接着剤層１４を介して設け
られた防食管継手の製造を終了する。FIG. 2 is a cross-sectional view for explaining the method of manufacturing the anticorrosion pipe joint of the present invention. The hot melt adhesive is applied onto the recess 13 of the main body 1 in the form of powder or solution. The cylindrical insert 2 is screwed into the one opening end 11 of the main body 1, and the inner side surface of the collar portion 23 of the insert 2 is brought into contact with the opening end surface.
The tip surface of the insert 2 is a vertical surface that coincides with the end of the recess 13. The slide core 3 is inserted into the tubular portion 21 of the insert 2 such that the column portion 31 forms a predetermined gap 33 with the inner circumferential surface of the tubular portion 21 and each portion thereof, and the tip of the slide core 3 projects beyond the tubular portion 21. The insert obturator 41 of the obturator 4 is screwed into the other open end 12 of the body 1 to close the open end.
Further, the pillar portion 421 of the slide core obturator 42 of the obturator 4
The tip end surface of the column portion 31 of the slide core 3 is brought into contact with the tip end surface of the. Then, it is surrounded by the recess 13 coated with the hot melt adhesive on the inner peripheral surface of the main body 1 and the distal end surface of the cylindrical portion 21 of the insert 2, the distal end surface of the pillar portion 31 of the slide core 3, and the obturator 4. The resin flow path formed by the slide core 3 and the insert 2, that is, the guide groove 3 into the formed annular space.
A resin is injected by injection molding through a resin flow path constituted by the groove 22, the groove 321, and the gap 33, and the hot melt adhesive applied to the recess 13 on the inner peripheral surface of the main body 1 by the resin heat at that time is applied. After being melted, the resin lining layer 15 is adhered to the concave portion 13 on the inner peripheral surface of the substantially central portion of the main body 1 via the hot melt adhesive layer 14. Thereafter, the insert 2, the slide core 3, and the obturator 4 are removed from the main body 1, and a resin lining layer 15 formed by injection molding is provided in the recess 13 of the main body 1 via the hot melt adhesive layer 14 to form an anticorrosion pipe joint. Will be finished manufacturing.
【００１２】この方法はホットメルト接着剤の溶融温度
が射出成型による樹脂ライニング時の樹脂温よりも低い
場合に採用される。図３は、本発明防食管継手の製造方
法の後半の工程を説明する正面図である。This method is adopted when the melting temperature of the hot melt adhesive is lower than the resin temperature at the time of resin lining by injection molding. FIG. 3 is a front view for explaining the latter half of the steps of the method for manufacturing an anticorrosion pipe joint of the present invention.
【００１３】この方法はホットメルト接着剤の溶融温度
が射出成型による樹脂ライニング時の樹脂温を越える場
合に採用される。まず、上述の本発明防食管継手の製造
方法と同様の工程により、本体１の略中央部内周面の凹
部１３にホットメルト接着剤を塗布し、その上に射出成
型による樹脂ライニング層を設けた後、本体１からイン
サート２、スライドコアー３及び閉塞具４を抜去せず
に、本体１の外周から加熱して本体１の凹部１３に塗布
したホットメルト接着剤を溶融し、しかる後冷却して、
本体１の凹部１３にホットメルト接着剤層を介して樹脂
ライニング層を接着せしめる。その後、本体１からイン
サート２、スライドコアー３及び閉塞具４を抜去して、
射出成型による樹脂ライニング層が本体１の凹部１３に
ホットメルト接着剤層を介して設けられた防食管継手の
製造を終了する。This method is adopted when the melting temperature of the hot melt adhesive exceeds the resin temperature at the time of resin lining by injection molding. First, a hot-melt adhesive was applied to the recess 13 on the inner peripheral surface of the main body 1 by the same steps as in the method for manufacturing an anticorrosion pipe joint of the present invention described above, and a resin lining layer formed by injection molding was provided thereon. After that, without removing the insert 2, the slide core 3 and the obturator 4 from the main body 1, the hot melt adhesive applied to the recess 13 of the main body 1 is melted by heating from the outer periphery of the main body 1 and then cooled. ,
The resin lining layer is adhered to the recess 13 of the main body 1 via the hot melt adhesive layer. Then, remove the insert 2, the slide core 3 and the obturator 4 from the main body 1,
The production of the anticorrosion pipe joint in which the resin lining layer by injection molding is provided in the recess 13 of the main body 1 via the hot melt adhesive layer is completed.
【００１４】この方法においては、本体１の外周からの
加熱は、加熱槽、導電加熱等いずれによるものでもよい
が、本体１を急激に加熱し、樹脂ライニング層にこれを
溶融又は軟化するような高温が伝わる前に速やかにホッ
トメルト接着剤に伝えてこれを溶融せしめ、ただちに急
冷して、本体１の内周面にホットメルト接着剤層を介し
て樹脂ライニング層を接着するようにできれば好適であ
る。In this method, the heating from the outer periphery of the main body 1 may be performed by any one of a heating tank and conductive heating, but the main body 1 is rapidly heated to melt or soften it in the resin lining layer. It is preferable if it is possible to quickly convey the hot melt adhesive to the hot melt adhesive before the high temperature is melted, quickly cool it, and bond the resin lining layer to the inner peripheral surface of the main body 1 via the hot melt adhesive layer. is there.
【００１５】[0015]
【発明の効果】 叙上の如く、本発明防食管継手は、略
中央部内周面に凹部を有し、両端部近傍内周面に雌ねじ
部を有する金属製管継手本体と、該凹部全面にホットメ
ルト接着剤層を介して射出成型により設けられた樹脂ラ
イニング層とからなっているので、金属製管継手本体の
略中央部内周面の凹部全面がその上に強固に接着された
樹脂ライニング層により確実に防食保護される。As described above, the anticorrosion pipe joint of the present invention has a metal pipe joint body having a concave portion on the inner peripheral surface of the substantially central portion and female thread portions on the inner peripheral surface near both ends, and the entire surface of the concave portion. Since it is composed of a resin lining layer provided by injection molding through a hot melt adhesive layer, the resin lining layer in which the entire concave portion of the inner peripheral surface of the metal pipe joint main body is firmly adhered thereon Protects against corrosion.
【００１６】また、金属性管継手本体の凹部内方に突出
した環状の樹脂ライニング層が設けられているので、こ
の継手に螺合接合される管はこの突出部に当接して過度
のねじ込みが防止される。Further, since the annular resin lining layer projecting inwardly of the concave portion of the metallic pipe joint body is provided, the pipe screw-joined to this joint comes into contact with this projecting portion and is not excessively screwed. To be prevented.
【図１】 本発明防食管継手の実施例を示す断面図FIG. 1 is a sectional view showing an embodiment of the anticorrosion pipe joint of the present invention.
【図２】 本発明防食管継手の製造方法を説明する断面
図FIG. 2 is a cross-sectional view illustrating a method for manufacturing an anticorrosion pipe joint of the present invention.
【図３】 本発明防食管継手の別の製造方法を説明する
正面図FIG. 3 is a front view for explaining another method of manufacturing the anticorrosion pipe joint of the present invention.
【図４】 従来のものを説明する断面図FIG. 4 is a sectional view illustrating a conventional one.
１ 金属製管継手本体 １１１ 雌ねじ部 １３ 凹部 １４ ホットメルト接着剤層 １５ 樹脂ライニング層 ２ インサート ３ スライドコアー 1 Metal Pipe Joint Main Body 111 Female Threaded Part 13 Recessed 14 Hot Melt Adhesive Layer 15 Resin Lining Layer 2 Insert 3 Slide Core
Claims (1)
傍内周面に雌ねじ部を有する金属製管継手本体と、該凹
部全面にホットメルト接着剤を介して射出成型により設
けられた本体の凹部内方に突出した環状の樹脂ライニン
グ層とからなる防食管継手。1. A metal pipe joint body having a concave portion on an inner peripheral surface of a substantially central portion and female thread portions on inner peripheral surfaces in the vicinity of both end portions, and provided on the entire concave portion by injection molding via a hot melt adhesive. An anticorrosion pipe joint consisting of an annular resin lining layer protruding inward of the recess of the main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3241621A JPH0757503B2 (en) | 1991-09-20 | 1991-09-20 | Anticorrosion pipe fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3241621A JPH0757503B2 (en) | 1991-09-20 | 1991-09-20 | Anticorrosion pipe fittings |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7394381A Division JPS57190190A (en) | 1981-05-15 | 1981-05-15 | Corrosion-proof pipe joint and its manufacture |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13694998A Division JPH1158446A (en) | 1998-05-19 | 1998-05-19 | Manufacture of corrosionproof pipe joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04357011A JPH04357011A (en) | 1992-12-10 |
| JPH0757503B2 true JPH0757503B2 (en) | 1995-06-21 |
Family
ID=17077049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3241621A Expired - Lifetime JPH0757503B2 (en) | 1991-09-20 | 1991-09-20 | Anticorrosion pipe fittings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0757503B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55100140A (en) * | 1979-01-29 | 1980-07-30 | Yoshida Kogyo Kk <Ykk> | Molding method and molding |
| JPS57189834A (en) * | 1981-05-19 | 1982-11-22 | Canon Inc | Double-color forming method |
-
1991
- 1991-09-20 JP JP3241621A patent/JPH0757503B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04357011A (en) | 1992-12-10 |
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