JPH04272822A - Manufacture of steel tube coated with synthetic resin, and die extrusion molding machine - Google Patents
Manufacture of steel tube coated with synthetic resin, and die extrusion molding machineInfo
- Publication number
- JPH04272822A JPH04272822A JP3034738A JP3473891A JPH04272822A JP H04272822 A JPH04272822 A JP H04272822A JP 3034738 A JP3034738 A JP 3034738A JP 3473891 A JP3473891 A JP 3473891A JP H04272822 A JPH04272822 A JP H04272822A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- resin
- synthetic resin
- steel tube
- coated
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 122
- 239000010959 steel Substances 0.000 title claims abstract description 122
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 42
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000001125 extrusion Methods 0.000 title claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 31
- 238000000576 coating method Methods 0.000 claims abstract description 31
- 239000000853 adhesive Substances 0.000 claims description 33
- 230000001070 adhesive effect Effects 0.000 claims description 33
- 238000003780 insertion Methods 0.000 claims description 15
- 230000037431 insertion Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 4
- 229920005989 resin Polymers 0.000 abstract description 57
- 239000011347 resin Substances 0.000 abstract description 57
- 238000000465 moulding Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 8
- 230000006698 induction Effects 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- -1 and as a result Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000003466 welding Methods 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、鋼管と合成樹脂とを一
体的に結合してなる合成樹脂を被覆した鋼管（以下、樹
脂被覆鋼管と略称する。）の製造方法及び押出成形機の
ダイに関するものである。[Industrial Application Field] The present invention relates to a method of manufacturing a synthetic resin-coated steel pipe (hereinafter referred to as resin-coated steel pipe) formed by integrally bonding a steel pipe and a synthetic resin, and a die of an extrusion molding machine. It is related to.
【０００２】0002
【従来の技術】従来の樹脂被覆鋼管の製造方法及び押出
成形機のダイとしては、以下に示すものが知られている
。即ち、コイル状に巻かれた帯鋼板は、フォーミングロ
ーラに通されて順次円筒状に成形される。こうして円筒
状に成形された帯鋼板端部のシームポイント近傍に高周
波誘導コイルを設置して、このシームポイントに熱を集
中発生させ、鋼板の両端縁を溶接することにより鋼管が
完成される。そしてまた必要により、鋼管の表面に高温
接着剤を塗布することにより接着剤塗膜が形成され、続
いて、鋼管は押出成形機を通過し、接着剤塗膜の外周に
塩化ビニル樹脂等の合成樹脂を薄く均一な層状に被覆し
、これを冷却水槽にて冷却することにより樹脂被覆鋼管
が完成される。BACKGROUND OF THE INVENTION As conventional methods for manufacturing resin-coated steel pipes and dies for extrusion molding machines, the following are known. That is, the coiled steel strip is passed through a forming roller and sequentially formed into a cylindrical shape. A high-frequency induction coil is installed near the seam point of the end of the steel strip formed into a cylindrical shape, heat is concentrated at the seam point, and both ends of the steel plate are welded to complete the steel pipe. And if necessary, an adhesive coating is formed by applying high-temperature adhesive on the surface of the steel pipe, and then the steel pipe is passed through an extrusion molding machine, and the outer periphery of the adhesive coating is coated with a synthetic material such as vinyl chloride resin. A resin-coated steel pipe is completed by coating the resin in a thin, uniform layer and cooling it in a cooling water tank.
【０００３】このように成形された樹脂被覆鋼管は既に
広く使用されており、農業温室用骨組や一般家庭におい
て通常使用されるような構造用材料に限らず、例えば、
室温が−３０〜４０℃に及ぶような冷凍庫を出入りする
カゴ車等、工業用にもこの樹脂被覆鋼管が使用されてい
る。[0003] Resin-coated steel pipes formed in this manner are already widely used, and are not limited to frames for agricultural greenhouses or structural materials commonly used in general households, for example.
This resin-coated steel pipe is also used for industrial purposes, such as cage cars that go in and out of freezers where the room temperature ranges from -30 to 40 degrees Celsius.
【０００４】0004
【発明が解決しようとする課題】ところが、従来の樹脂
被覆鋼管では、鋼管自体の表面又は鋼管の接着剤塗膜表
面に対してそのまま合成樹脂を被覆しているため、接着
剤塗膜内もしくは、接着剤塗膜と被覆された合成樹脂と
の間に空気及び樹脂ガスが閉じ込められた状態になって
しまうことがある。このため、例えば上記したカゴ車に
従来の樹脂被覆鋼管を使用した場合には、冷凍庫内外の
気温差が非常に大きくなるため、冷凍庫の出入りに伴い
樹脂被覆鋼管に閉じ込められた空気及び樹脂ガスが膨張
収縮を繰り返して合成樹脂の表面にひびが入り、その結
果ひび割れ部分から水滴が入り込んで錆が発生するとい
う問題点があった。[Problems to be Solved by the Invention] However, in conventional resin-coated steel pipes, the surface of the steel pipe itself or the surface of the adhesive coating of the steel pipe is directly coated with the synthetic resin, so that the inside of the adhesive coating or Air and resin gas may become trapped between the adhesive coating and the coated synthetic resin. For this reason, for example, if conventional resin-coated steel pipes are used in the above-mentioned basket car, the temperature difference inside and outside the freezer will be very large, and the air and resin gas trapped in the resin-coated steel pipes will be released as the freezer is moved in and out. There is a problem in that repeated expansion and contraction causes cracks in the surface of the synthetic resin, and as a result, water droplets enter through the cracks and cause rust.
【０００５】また、押出成形機から押出される合成樹脂
は接着剤と、樹脂自体の収縮のみで鋼管に接着していた
ため接着力が弱く、更には、樹脂被覆鋼管を大量生産す
るために合成樹脂の押出し速度を上げると、高温接着剤
を使用しているので、樹脂収縮がおきない内に冷却水槽
内に入り冷却されてしまい、接着力がでないという問題
点もあった。In addition, the synthetic resin extruded from an extrusion molding machine has a weak adhesive force because it adheres to the steel pipe only by the adhesive and the shrinkage of the resin itself.Furthermore, in order to mass produce resin-coated steel pipes, synthetic resin When the extrusion speed is increased, since a high-temperature adhesive is used, the adhesive enters the cooling water tank and is cooled before the resin shrinks, resulting in a loss of adhesive strength.
【０００６】本発明は、上記問題点に省みてなされたも
のであって、樹脂被覆鋼管の製造過程において、鋼管表
面と合成樹脂との間に、又は接着剤塗膜内、及び接着剤
塗膜と被覆された合成樹脂との間に空気及び樹脂ガスが
入り込まないようにして耐候性に優れるとともに、鋼管
と合成樹脂とが素早く、しかも強力に接着される樹脂被
覆鋼管の製造方法及び押出成形機のダイを提供すること
を目的としている。The present invention has been made in consideration of the above-mentioned problems.In the manufacturing process of resin-coated steel pipes, there are A manufacturing method and an extrusion molding machine for a resin-coated steel pipe which has excellent weather resistance by preventing air and resin gas from entering between the steel pipe and the synthetic resin and which quickly and strongly bonds the steel pipe and the synthetic resin. The purpose is to provide a die.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に、本発明における樹脂被覆鋼管の製造方法としては、
接着剤塗膜を表面に有する鋼管の周囲を抜気し、この抜
気状態の鋼管表面に対し、合成樹脂を押出し被覆するも
のである。また、押出成形機のダイとしては、鋼管が挿
通可能に内部を形成した鋼管挿通筒部に対し内部に連通
するとともに抜気駆動源に連結される抜気口を形成し、
鋼管挿通筒部の外周には筒状の金型ダイスを形成し、前
記金型ダイスはその先端にノズルを形成するとともに、
その一部に合成樹脂を供給する供給口を設けたものであ
る。[Means for Solving the Problems] In order to solve the above problems, the method for manufacturing a resin-coated steel pipe in the present invention includes the following steps:
Air is evacuated from around a steel pipe that has an adhesive coating on its surface, and a synthetic resin is extruded and coated on the evacuated surface of the steel pipe. In addition, as a die of an extrusion molding machine, an air vent is formed in a steel pipe insertion cylinder portion having an interior formed so that a steel pipe can be inserted thereinto, and which communicates with the inside and is connected to an air vent drive source.
A cylindrical mold die is formed on the outer periphery of the steel pipe insertion cylinder, and the mold die has a nozzle formed at its tip, and
A part of it is provided with a supply port for supplying synthetic resin.
【０００８】[0008]
【作用】請求項１の発明では、接着剤塗膜を有する鋼管
は、その周囲で表面が抜気した状態になっている箇所に
合成樹脂を被覆するため、接着剤塗膜内及び、接着剤塗
膜と被覆された合成樹脂との間に空気及び樹脂ガスが入
り込むことがない。また、鋼管と合成樹脂との間は抜気
した状態にするため、外気との圧力差が生じ、合成樹脂
の収縮作用により鋼管に対し強力に被覆吸い寄せられる
。[Operation] According to the invention as claimed in claim 1, since the steel pipe having the adhesive coating film is coated with synthetic resin around the area where the surface is vented, the inside of the adhesive coating film and the adhesive Air and resin gas do not enter between the coating film and the coated synthetic resin. Furthermore, since air is removed between the steel pipe and the synthetic resin, a pressure difference with the outside air is generated, and the shrinkage of the synthetic resin causes the steel pipe to be coated strongly.
【０００９】また、請求項２の発明では、鋼管挿通筒部
に対し抜気口を形成し、鋼管挿通筒部の外周には金型ダ
イスを形成してその先端にノズルを形成したので、鋼管
表面を抜気状態に保ちつつ、合成樹脂を供給することが
できる。In addition, in the invention of claim 2, an air vent is formed in the steel pipe insertion cylinder, a mold die is formed on the outer periphery of the steel pipe insertion cylinder, and a nozzle is formed at the tip of the mold die. Synthetic resin can be supplied while keeping the surface in a vented state.
【００１０】0010
【実施例】以下、本発明を具体化した一実施例を図１〜
３に基づいて説明する。図１に示すように、この実施例
における樹脂被覆鋼管２１の一連の製造ラインは、帯鋼
板２から鋼管６を成形する鋼管成形装置Ａと、この鋼管
６の表面に対し接着溶剤１０を塗布する接着溶剤塗布装
置Ｂと、この接着溶剤１０が塗布された鋼管６に対し合
成樹脂２７を押出し被覆する樹脂被覆装置Ｃと、この樹
脂被覆鋼管２１を冷却する冷却装置Ｄとからなっている
。[Example] Hereinafter, an example embodying the present invention is shown in Figs.
The explanation will be based on 3. As shown in FIG. 1, a series of production lines for resin-coated steel pipes 21 in this embodiment include a steel pipe forming apparatus A that forms steel pipes 6 from steel strips 2, and a steel pipe forming apparatus A that forms steel pipes 6 from steel strips 2, and applies adhesive solvent 10 to the surface of the steel pipes 6. It consists of an adhesive solvent coating device B, a resin coating device C that extrudes and coats the synthetic resin 27 on the steel pipe 6 coated with the adhesive solvent 10, and a cooling device D that cools the resin coated steel pipe 21.
【００１１】鋼管成形装置Ａは、コイル１から板厚１ｍ
ｍの帯鋼板２を引出すとともに、この帯鋼板２の歪みを
矯正するピンチローラ３と、ピンチローラ３から押出さ
れる平板状の帯鋼板２を逐次四角筒状に成形するフォー
ミングローラ４と、四角筒状に成形された帯鋼板２両端
部の合せ目が互いに接触するシームポイント５をインナ
ー溶接し、溶接部２６が内側に突出される鋼管６を成形
する高周波誘導コイル７とからなっている。[0011] The steel pipe forming apparatus A has a plate thickness of 1 m from the coil 1.
m pinch rollers 3 which pull out the steel strip 2 and correct the distortion of the steel strip 2; a forming roller 4 which sequentially forms the flat steel strip 2 extruded from the pinch roller 3 into a rectangular tube shape; It consists of a high frequency induction coil 7 forming a steel pipe 6 with a welded part 26 protruding inward by inner welding a seam point 5 where the joints of both ends of a steel strip 2 formed into a cylindrical shape are in contact with each other.
【００１２】接着溶剤塗布装置Ｂは、高周波誘導コイル
７からピンチローラ８を介して搬送される鋼管６表面の
埃，油分等を除くために洗浄を行う脱脂装置９と、この
洗浄された鋼管６に対し接着溶剤１０を塗布する塗布装
置１１と、鋼管６に対し塗布された接着溶剤１０を高周
波焼付させて接着剤塗膜２５を成形する誘導加熱装置１
２と、誘導加熱装置１２にて加熱された鋼管６の温度が
低下しないように保温するための保温装置１３とからな
っている。The adhesive solvent applicator B includes a degreasing device 9 that cleans the surface of the steel pipe 6 that is conveyed from the high frequency induction coil 7 via the pinch rollers 8 to remove dust, oil, etc. and an induction heating device 1 that forms an adhesive coating film 25 by high-frequency baking the adhesive solvent 10 applied to the steel pipe 6.
2, and a heat retaining device 13 for keeping the temperature of the steel pipe 6 heated by the induction heating device 12 from decreasing.
【００１３】樹脂被覆装置Ｃは、鋼管６表面を抜気して
真空状態に保持するための抜気駆動源としての真空ポン
プ１４と、合成樹脂２７を押出して鋼管６表面に被覆す
る押出成形機１５とから構成されている。前記押出成形
機１５の大部分は従来から公知の構成を有しており、押
出成形機１５に付設されるダイ２８のみが異なる。ダイ
２８について詳述すると、ダイ２８は鋼管挿通筒部１６
が四角筒状に形成され、鋼管６が内部を一定間隔を置い
て移動可能となっている。この鋼管挿通筒部１６の基端
側（図２においては左方）下面には抜気口２８ａが透設
され、中空の連通パイプ１７を介して真空ポンプ１４に
接続されている。鋼管挿通筒部１６には、その基端部開
口を閉塞するためにシールパッキン１８が取着されてい
る。また、鋼管挿通筒部１６の外周には金型ダイス２０
が筒状に形成され、この金型ダイス２０は鋼管挿通筒部
１６の外周を一定間隔を置いて覆うように設けられてい
る。金型ダイス２０の先端（図２においては右方）には
、内方に絞られるノズル２０ａが形成され、鋼管挿通筒
部１６の先端開口部１６ａとほぼ同一位置まで延出され
ている。そして、金型ダイス２０の一側には供給口２８
ｂが設けられ、連通パイプ１９を介して押出成形機１５
に接続されている。The resin coating device C includes a vacuum pump 14 as an air removal drive source for removing air from the surface of the steel pipe 6 and maintaining it in a vacuum state, and an extrusion molding machine for extruding a synthetic resin 27 and coating it on the surface of the steel pipe 6. It consists of 15. Most of the extrusion molding machine 15 has a conventionally known configuration, and only the die 28 attached to the extrusion molding machine 15 is different. To explain the die 28 in detail, the die 28 is connected to the steel pipe insertion cylinder portion 16.
is formed into a rectangular cylindrical shape, and the steel pipe 6 is movable inside at regular intervals. An air vent 28a is provided through the lower surface of the base end side (left side in FIG. 2) of the steel pipe insertion cylindrical portion 16, and is connected to the vacuum pump 14 via a hollow communication pipe 17. A seal packing 18 is attached to the steel pipe insertion cylinder portion 16 to close the opening at its base end. Further, a mold die 20 is provided on the outer periphery of the steel pipe insertion cylinder portion 16.
is formed into a cylindrical shape, and the mold die 20 is provided so as to cover the outer periphery of the steel pipe insertion cylindrical portion 16 at regular intervals. A nozzle 20a that is constricted inward is formed at the tip of the mold die 20 (on the right side in FIG. 2), and extends to approximately the same position as the tip opening 16a of the steel pipe insertion cylindrical portion 16. A supply port 28 is provided on one side of the mold die 20.
b is provided, and the extrusion molding machine 15 is connected via the communication pipe 19.
It is connected to the.
【００１４】冷却装置Ｄは、高温の樹脂被覆鋼管２１を
徐々に冷却するために表面に噴霧冷却を施す序冷装置２
２と、この序冷装置２２にて所定温度まで冷却された樹
脂被覆鋼管２１全体を完全に冷却させるための冷却用水
槽２３とからなっている。製造ラインの最終段階におい
て、完成された樹脂被覆鋼管２１を所定間隔にカットす
るための定尺カット装置２４が樹脂被覆鋼管２１の進行
と共に移動可能に設置されている。なお、この一連の製
造ライン中の各所定位置には鋼管６を押出し、或いは引
出すために、複数のピンチローラ３，８，８ａ，８ｂが
配設されている。The cooling device D is an initial cooling device 2 that performs spray cooling on the surface of the high temperature resin-coated steel pipe 21 to gradually cool it.
2, and a cooling water tank 23 for completely cooling the entire resin-coated steel pipe 21 that has been cooled to a predetermined temperature by the cooling device 22. At the final stage of the production line, a fixed-length cutting device 24 for cutting the completed resin-coated steel pipe 21 at predetermined intervals is installed so as to be movable as the resin-coated steel pipe 21 advances. Incidentally, a plurality of pinch rollers 3, 8, 8a, 8b are arranged at each predetermined position in this series of production lines in order to push out or pull out the steel pipe 6.
【００１５】次に、以上のように構成された樹脂被覆鋼
管の製造装置について、その作用を説明する。この実施
例の樹脂被覆鋼管の製造装置にて樹脂被覆鋼管を製造す
るに際して、まず、全工程を通して各ピンチローラ３，
８，８ａ，８ｂが一定の回転速度に保持されることによ
り、鋼管６の進行速度が約４ｍ／分に設定されている。
そして、第１工程として、図３（ａ）に示すようなコイ
ル１から引出された平板状の帯鋼板２を、鋼管成形装置
Ａにて断面正方形であって、その一辺が２６ｍｍの鋼管
６に成形する。この実施例においては、帯鋼板２を高周
波誘導コイル７により発生される熱を利用してインナー
溶接が施されているため、図３（ｃ）に示すように、溶
接部２６は鋼管６内部に突出され、鋼管６表面は滑らか
に成形される。Next, the operation of the resin-coated steel pipe manufacturing apparatus constructed as described above will be explained. When manufacturing a resin-coated steel pipe using the resin-coated steel pipe manufacturing apparatus of this embodiment, first, each pinch roller 3,
8, 8a, and 8b are maintained at a constant rotational speed, the advancing speed of the steel pipe 6 is set to about 4 m/min. As a first step, a flat steel strip 2 drawn from the coil 1 as shown in FIG. Shape. In this embodiment, since the steel strip 2 is inner welded using the heat generated by the high frequency induction coil 7, the welded portion 26 is inside the steel pipe 6, as shown in FIG. 3(c). The surface of the steel pipe 6 is formed smoothly.
【００１６】第２工程として、鋼管６の表面を洗浄する
とともに、樹脂被覆をより強力にするため接着溶剤１０
（具体的には「コニシボンドＫＢＳ−６２３」（商標）
）を塗布するが、洗浄方法としてはトリクレン洗浄が施
されて鋼管６表面の埃，油分が効果的に落される。
そして、誘導加熱装置１２にて接着溶剤１０が所定温度
にて高周波焼付され、図３（ｄ）に示すように接着剤塗
膜２５が鋼管６の表面に形成される。As a second step, the surface of the steel pipe 6 is cleaned and an adhesive solvent 10 is applied to make the resin coating stronger.
(Specifically, “Konishi Bond KBS-623” (trademark)
), but as a cleaning method, triclean cleaning is performed to effectively remove dust and oil from the surface of the steel pipe 6. Then, the adhesive solvent 10 is subjected to high frequency baking at a predetermined temperature in the induction heating device 12, and an adhesive coating film 25 is formed on the surface of the steel pipe 6 as shown in FIG. 3(d).
【００１７】第３工程として、鋼管６に対し合成樹脂２
７が被覆されるが、図２に示すように、真空ポンプ１４
及び押出成形機１５に対し、鋼管６は矢印Ｐ方向に一定
速度（約４ｍ／分）で進行している。そして、真空ポン
プ１４の吸引力により空気及び樹脂ガスは矢印Ｒ方向に
吸引されるため、鋼管６の表面には空気及び樹脂ガスが
なくなりほぼ真空状態となる。なお、この実施例におい
ては、真空ポンプ１４内部の気圧は０．５〜１．０ｃｍ
Ｈｇに設定されている。また、合成樹脂２７は高周波焼
付温度より若干高い温度に熱せられ、真空ポンプ１４に
よりほぼ真空状態にされた箇所に対し、合成樹脂２７が
押出成形機１５から矢印Ｑ方向に一定にムラなく押出さ
れ、図３（ｅ）に示すように合成樹脂２７の厚みが１ｍ
ｍ程度に成形される。なお、この実施例においては、合
成樹脂２７として耐候性に非常に優れたＡＡＳ樹脂（具
体的には日立化成製の「バイタックス」（商標））が使
用されている。As the third step, the synthetic resin 2 is applied to the steel pipe 6.
7 is coated with a vacuum pump 14, as shown in FIG.
The steel pipe 6 is moving at a constant speed (approximately 4 m/min) in the direction of arrow P with respect to the extrusion molding machine 15. Since the air and resin gas are sucked in the direction of arrow R by the suction force of the vacuum pump 14, the surface of the steel pipe 6 is free of air and resin gas and becomes almost in a vacuum state. In this embodiment, the atmospheric pressure inside the vacuum pump 14 is 0.5 to 1.0 cm.
It is set to Hg. Furthermore, the synthetic resin 27 is heated to a temperature slightly higher than the high-frequency baking temperature, and the synthetic resin 27 is uniformly and evenly extruded from the extrusion molding machine 15 in the direction of the arrow Q to a place that is almost evacuated by the vacuum pump 14. , as shown in FIG. 3(e), the thickness of the synthetic resin 27 is 1 m.
It is molded to about m. In this embodiment, as the synthetic resin 27, AAS resin (specifically, "Vitax" (trademark) manufactured by Hitachi Chemical Co., Ltd.), which has excellent weather resistance, is used.
【００１８】第４工程として、第３工程で成形された高
温の樹脂被覆鋼管２１は噴霧冷却により序冷し、その後
冷却媒体として水が貯留された冷却用水槽２３にて樹脂
被覆鋼管２１を通すことにより常温まで落とされて樹脂
被覆鋼管２１が完成される。この樹脂被覆鋼管２１は、
樹脂被覆鋼管２１と同一速度（すなわち約４ｍ／分）で
移動される定尺カット装置２４にて所定の間隔にカット
される。As a fourth step, the high temperature resin-coated steel pipe 21 formed in the third step is initially cooled by spray cooling, and then the resin-coated steel pipe 21 is passed through a cooling water tank 23 in which water is stored as a cooling medium. As a result, the temperature is lowered to room temperature, and the resin-coated steel pipe 21 is completed. This resin-coated steel pipe 21 is
The resin-coated steel pipe 21 is cut at predetermined intervals by a length cutting device 24 that moves at the same speed (ie, about 4 m/min).
【００１９】このようにして製造された樹脂被覆鋼管２
１は、接着剤塗膜２５内及び、接着剤塗膜２５と被覆さ
れた合成樹脂２７との間に空気及び樹脂ガスが入り込む
ことがなく、しかも合成樹脂２７としてＡＡＳ樹脂を使
用しているので、耐候性に優れる。また、樹脂被覆装置
Ｃにおいて、真空ポンプ１４により鋼管６の外周を真空
状態にするため、鋼管６の表面に合成樹脂２７が強力に
吸引されて素早く、しかも強力に接着される。Resin-coated steel pipe 2 manufactured in this way
1, since air and resin gas do not enter into the adhesive coating film 25 and between the adhesive coating film 25 and the synthetic resin 27 covered, and AAS resin is used as the synthetic resin 27. , excellent weather resistance. Further, in the resin coating device C, since the outer periphery of the steel pipe 6 is brought into a vacuum state by the vacuum pump 14, the synthetic resin 27 is strongly attracted to the surface of the steel pipe 6 and bonded quickly and strongly.
【００２０】なお、本発明は前記実施例に限定されるも
のではなく、例えば、鋼管６を断面正方形のものに代え
て、円筒形状等の各種形状のものにより樹脂被覆鋼管２
１を製造する等、本発明の趣旨から逸脱しない範囲で任
意に変更することも可能である。It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, instead of the steel pipe 6 having a square cross section, the resin-coated steel pipe 2 may be made of various shapes such as a cylindrical shape.
It is also possible to make arbitrary changes without departing from the spirit of the present invention, such as manufacturing 1.
【００２１】[0021]
【発明の効果】以上詳述したように、請求項１の発明で
は、接着剤塗膜を有する鋼管は、その周囲で表面が抜気
した状態になっている箇所に合成樹脂を被覆するため、
接着剤塗膜内及び、接着剤塗膜と被覆された合成樹脂と
の間に空気及び樹脂ガスが入り込むことがない。また、
鋼管表面と合成樹脂との間は抜気した状態にするため、
外気との圧力差が生じ、合成樹脂が鋼管に対し強力に吸
い寄せられる他、被覆された合成樹脂の収縮作用により
、鋼管表面に強力に吸い寄せられる。また、所定寸法の
カットにおいても、鋼管と被覆樹脂との間に水滴等の浸
入がなく、防錆効果が期待できる。Effects of the Invention As described in detail above, in the invention of claim 1, the steel pipe having the adhesive coating is coated with synthetic resin around the area where the surface is vented.
Air and resin gas do not enter into the adhesive coating or between the adhesive coating and the coated synthetic resin. Also,
In order to vent air between the steel pipe surface and the synthetic resin,
A pressure difference with the outside air is created, and the synthetic resin is strongly attracted to the steel pipe, and the shrinkage of the coated synthetic resin causes it to be strongly attracted to the surface of the steel pipe. Furthermore, even when cut to a predetermined size, no water droplets or the like will enter between the steel pipe and the coating resin, and a rust-preventing effect can be expected.
【００２２】さらにまた、請求項２の発明では、鋼管挿
通筒部に対し抜気口を形成し、鋼管挿通筒部の外周には
金型ダイスを形成してその先端にノズルを形成したので
、鋼管表面を抜気状態に保ちつつ、合成樹脂を供給する
ことができる。これにより、接着剤塗膜内及び、接着剤
塗膜と被覆された合成樹脂との間に空気及び樹脂ガスが
入り込まないようにして耐候性に優れるとともに、鋼管
と合成樹脂とが素早く、しかも強力に接着される樹脂被
覆鋼管が得られるという優れた効果を奏する。Furthermore, in the invention of claim 2, an air vent is formed in the steel pipe insertion tube, a mold die is formed on the outer periphery of the steel tube insertion tube, and a nozzle is formed at the tip of the mold die. Synthetic resin can be supplied while keeping the steel pipe surface in a vented state. This prevents air and resin gas from entering into the adhesive coating and between the adhesive coating and the synthetic resin coated, resulting in excellent weather resistance, and allows the steel pipe and synthetic resin to bond quickly and strongly. This has the excellent effect of providing a resin-coated steel pipe that can be bonded to the surface of the pipe.
【図１】本発明の一実施例を示し、樹脂被覆鋼管製造ラ
インの全体図（矢印Ｘから矢印Ｙへは同一直線上で繋が
るものとする。）である。FIG. 1 shows an embodiment of the present invention, and is an overall view of a resin-coated steel pipe production line (arrows X and Y are connected on the same straight line).
【図２】同じく、樹脂被覆装置を示す要部断面図である
。FIG. 2 is a cross-sectional view of a main part of the resin coating device.
【図３】同じく、樹脂被覆鋼管の成形過程を示す断面図
である。FIG. 3 is a cross-sectional view showing the process of forming a resin-coated steel pipe.
６ 鋼管、１４ 抜気駆動源としての真空ポンプ、
１６ 鋼管挿通筒部、２０金型ダイス、２０ａ ノ
ズル、２５ 接着剤塗膜、２７ 合成樹脂、２８ａ
抜気口、２８ｂ 供給口。6 Steel pipe, 14 Vacuum pump as air extraction drive source,
16 Steel pipe insertion cylinder part, 20 Mold die, 20a Nozzle, 25 Adhesive coating film, 27 Synthetic resin, 28a
Vent port, 28b supply port.
Claims (2)
管（６）の周囲を抜気し、この抜気状態の鋼管（６）表
面に対し、合成樹脂（２７）を押出し被覆することを特
徴とする合成樹脂を被覆した鋼管の製造方法。[Claim 1] Ventilating the surroundings of a steel pipe (6) having an adhesive coating film (25) on its surface, and extruding and coating the surface of the steel pipe (6) in this vented state with a synthetic resin (27). A method for manufacturing a steel pipe coated with a synthetic resin, characterized by:
た鋼管挿通筒部（１６）に対し内部に連通するとともに
抜気駆動源（１４）に連結される抜気口（２８ａ）を形
成し、鋼管挿通筒部（１６）の外周には筒状の金型ダイ
ス（２０）を形成し、前記金型ダイス（２０）はその先
端にノズル（２０ａ）を形成するとともに、その一部に
合成樹脂（２７）を供給する供給口（２８ｂ）を設けた
ことを特徴とする押出成形機のダイ。2. An air vent (28a) is formed that communicates with the inside of the steel pipe insertion tube (16), which is formed so that the steel pipe (6) can be inserted therethrough, and that is connected to the air vent drive source (14). A cylindrical mold die (20) is formed on the outer periphery of the steel pipe insertion cylindrical part (16), and the mold die (20) has a nozzle (20a) formed at its tip and a part of the mold die (20). A die for an extrusion molding machine characterized by being provided with a supply port (28b) for supplying a synthetic resin (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3034738A JPH04272822A (en) | 1991-02-28 | 1991-02-28 | Manufacture of steel tube coated with synthetic resin, and die extrusion molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3034738A JPH04272822A (en) | 1991-02-28 | 1991-02-28 | Manufacture of steel tube coated with synthetic resin, and die extrusion molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04272822A true JPH04272822A (en) | 1992-09-29 |
Family
ID=12422662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3034738A Pending JPH04272822A (en) | 1991-02-28 | 1991-02-28 | Manufacture of steel tube coated with synthetic resin, and die extrusion molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04272822A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017161518A (en) * | 2016-03-04 | 2017-09-14 | Ｊｆｅスチール株式会社 | Inspection method and inspection system for adhesive strength of resin coating steel tube and manufacturing method of resin coating steel tube using inspection method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS48102862A (en) * | 1972-04-12 | 1973-12-24 | ||
| JPS5559933A (en) * | 1978-10-30 | 1980-05-06 | Idemitsu Kosan Co Ltd | Coating of member |
| JPS5867435A (en) * | 1981-10-17 | 1983-04-22 | Kawasaki Steel Corp | Forming method of synthetic resin covering layer on outer circumference of steel pipe |
| JPS5874336A (en) * | 1981-10-30 | 1983-05-04 | Nippon Kokan Kk <Nkk> | Manufacture of coated steel pipe |
| JPS5874337A (en) * | 1981-10-30 | 1983-05-04 | Nippon Kokan Kk <Nkk> | Manufacture of close contact plastic-coated steel pipe and device thereof |
| JPS61181U (en) * | 1984-06-05 | 1986-01-06 | 三洋電機株式会社 | display device |
| JPS6234747U (en) * | 1985-08-20 | 1987-02-28 |
-
1991
- 1991-02-28 JP JP3034738A patent/JPH04272822A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS48102862A (en) * | 1972-04-12 | 1973-12-24 | ||
| JPS5559933A (en) * | 1978-10-30 | 1980-05-06 | Idemitsu Kosan Co Ltd | Coating of member |
| JPS5867435A (en) * | 1981-10-17 | 1983-04-22 | Kawasaki Steel Corp | Forming method of synthetic resin covering layer on outer circumference of steel pipe |
| JPS5874336A (en) * | 1981-10-30 | 1983-05-04 | Nippon Kokan Kk <Nkk> | Manufacture of coated steel pipe |
| JPS5874337A (en) * | 1981-10-30 | 1983-05-04 | Nippon Kokan Kk <Nkk> | Manufacture of close contact plastic-coated steel pipe and device thereof |
| JPS61181U (en) * | 1984-06-05 | 1986-01-06 | 三洋電機株式会社 | display device |
| JPS6234747U (en) * | 1985-08-20 | 1987-02-28 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017161518A (en) * | 2016-03-04 | 2017-09-14 | Ｊｆｅスチール株式会社 | Inspection method and inspection system for adhesive strength of resin coating steel tube and manufacturing method of resin coating steel tube using inspection method |
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