EP0003369A1 - Verfahren zur Herstellung eines aussen beschichteten Rohrs aus einem Stahlband und ein nach diesem Verfahren hergestelltes Rohr - Google Patents

Verfahren zur Herstellung eines aussen beschichteten Rohrs aus einem Stahlband und ein nach diesem Verfahren hergestelltes Rohr Download PDF

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Publication number
EP0003369A1
EP0003369A1 EP79200005A EP79200005A EP0003369A1 EP 0003369 A1 EP0003369 A1 EP 0003369A1 EP 79200005 A EP79200005 A EP 79200005A EP 79200005 A EP79200005 A EP 79200005A EP 0003369 A1 EP0003369 A1 EP 0003369A1
Authority
EP
European Patent Office
Prior art keywords
tube
powder
coating
preheating
thermosetting
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.)
Withdrawn
Application number
EP79200005A
Other languages
English (en)
French (fr)
Inventor
Johan De Zeeuw
Jan Barendregt
Jacob Cornelis Vermeulen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Estel Buizen Bv
VER BUIZENFAB
Original Assignee
Estel Buizen Bv
VER BUIZENFAB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Estel Buizen Bv, VER BUIZENFAB filed Critical Estel Buizen Bv
Publication of EP0003369A1 publication Critical patent/EP0003369A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0807—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/09—Making tubes with welded or soldered seams of coated strip material ; Making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders

Definitions

  • This invention relates to a method of making tube from steel strip and externally coating the tube with thermosetting material, including the steps of longitudinally folding and welding the strip to form the tube, preheating the tube, applying thermosettable material in powder form to the exterior of the preheated tube, inductively heating the tube so as to cause curing of the thermosettable material, and cooling the coated tube.
  • the invention further relates to tube made by the method.
  • thermosetting coating applied may be a lacquer, and we shall use this term frequently in the following discussion.
  • United States patent specification 3,616,983 describes an apparatus for continuous formation of a metal tube which is internally and externally coated with artificial resin.
  • the external coating step is performed by applying a powdered synthetic material after calibration (also called “sizing"), cleaning, liquid- priming and inductive heating of the previously welded and internally coated tube. It is followed by cooling sawing to length and storage.
  • thermoplastic synthetic materials When applying thermoplastic powders it is possible to spray the powder directly onto a preheated surface, where it melts quickly and forms a closed final layer, which cooling can follow immediately.
  • Thermoplastic synthetic materials have the disadvantage that they must be applied in a considerably thicker layer than thermosetting synthetic materials in order to achieve the same corrosion-resistance.
  • so-called "primers” when using thermoplastic synthetic materials, so-called "primers” must often be used to obtain proper adherence of the coating to the metal surface.
  • Another disadvantage is that the standard thermoplastic synthetic materials such as polyvinyl-chloride, nylon etc. are a great deal more expensive that the usual thermosetting lacquer powders.
  • thermosetting coating material for tubes has been proposed. See U.S.A. Patent No. 3,667,095 in which the application of resin with solvent prior to a two-stage heating process is proposed.
  • U.S.A. Patent No. 3,965,551 proposes a method as described at the outset in which after continuous forming, welding, and galvanising, the tube is covered with thermoplastic or thermosetting powder and then heated inductively to form the coating.
  • the purpose of the preheating before application of the powder is to dry a previously applied liquid coating, e.g. solvent-based primer coating.
  • a thermosetting powder material is used as the exterior coating, the controlled heating to effect melting and curing takes place entirely after the powder has been applied. This method is not fully satisfactory, and we have found it open to improvement, in particular to achieve a more rapid melting and flowing of the powder without the formation of bubbles or blisters in the coating due to entrapped air and chemical reaction products in the coating.
  • the object of this invention is to improve the known processes described above in order to provide a process suitable for use with thermosetting coating material, and in particular a process which will achieve a smooth and continuous layer of cured thermosetting material on the tube without formation of bubbles or blisters in the coating.
  • the method preferably includes the steps of, after welding and before pre-heating the tube, cleaning its exterior surface and pre-treating its exterior surface to improve adherence of the thermosetting coating and to improve corrosion-resistance.
  • Heating of the tube both before and after the powder is applied is essential to the method according to the invention.
  • the purpose of preheating is to cause melting of the thermosetting powder as soon as it is applied. It thus spreads out across the preheated surface, so that the entire process is speeded up. This preheating can also aid the formation of a proper smooth final layer.
  • the moving tube product is preferably preheated, suitably by middle-frequency induction heating, to a maximum temperature of 200°C, or any other suitable temperature at which the hardening reaction of the thermosetting material does not progress very quickly.
  • the powder will start to melt and flow together and as a result of the very slow progress of hardening at the temperature chosen will have the opportunity to work itself into a smooth film across the tube surface. In this way it is possible to achieve a satisfactory closed final layer.
  • thermosetting layer is initiated.
  • a third important step is to maintain a suitable higher temperature (e.g. 400 0 C maximum) of the tube for a certain periode sufficient to produce hardening or curing of the layer.
  • each coil of steel strip is welded to the previous coil to form an endless strip which is continuously fed through the plant.
  • the strip-cleaning device 199 the strip is cleaned.
  • a tube is shaped out of the strip, is welded and next sized or calibrated to the proper desired end size. If necessary a straightening unit 201 follows.
  • pre- heating of the tube can take place in a gas furnace 202.
  • a degreasing and phosphating section 203 the tube is cleaned on the outside and provided with a priming coat e.g. iron phosphate to enhance lacquer adherence.
  • a rinsing bath 204 in which the tube is rinsed clean. So far, the process is conventional, and need not be described in more detail.
  • a first middle-frequency induction heating furnace 205 encircling the tube path in the manner of a coil (its frequency is approx. 3000 Hz) serves to dry the tube and to heat it to a temperature of approx. 50 to 150 degrees C (maximum 200 degrees C), the exact temperature being chosen according to the melting temperature of the lacquer powder to be applied next.
  • thermosetting powder is then applied to the tube in the powder cabin 206, as a starting material for the desired lacquer coating.
  • Epoxy resins, polyester resins such as polyurethanes, polyacrylate resins or combinations of these may serve as suitable thermosetting synthetic materials in powder form.
  • the powder melts when applied.
  • the powder In the subsequent enclosure 207, which may simply be a box, the powder has the oppertunity to spread out and to form a closed smooth layer all round the tube.
  • This melting and spreading out initiated while the powder is being applied, has a beneficial effect on the quality of the coating produced; in particular it causes air bubbles in the lacquer film to be removed.
  • any porosities in the lacc.ier film are moved outwards, in contrast to the case where heat is supplied only from the outside when porosities can be trapped in the lacquer film.
  • thermosetting synthetic material can be obtained starting from powder. This powder is given the opportunity to flow and spread out at comparatively low temperatures at which polymerisation of the synthetic material still progresses very slowly.
  • thermosetting synthetic powder is advantageous because dispersion lacquers which can be diluted with water, and so-called two-component lacquers which must be sprayed on as a liquid with 10 to 20 percent solvent, have known disadvantages. Also, the solvent in each case has drawbacks of an environmental nature.
  • a second middle-frequency induction heating furnace 208 (frequency approximately 3000 Hz) causes a rapid rise in temperature of the tube (up to a maximum of 400 degrees C) so that hardening of the already molten and spread out lacquer film is speeded up substantially. In the subsequent hardening film is brought about.
  • the temperature in this furnace 209 is also 400 degrees C maximum.
  • addition reaction of the thermosetting synthetic material about 1 percent of secondary products are formed. These can be removed by suction. Since here the heat for hardening originates from the tube material itself, the hardening process starts from the inside.
  • thermosetting synthetic material is frequently less than 0.060 mm, in contrast with the layer thickness of a thermoplastic synthetic material, which frequently exceeds 0.1 mm.
  • the hardening lacquer film should be kept at the chosen temperature for the time required for adequate hardening of the thermosetting material selected, which is the reason why the hardening furnace 209 is comparatively long.
  • the lacquered tube is cooled down to room temperature.
  • a drawing or pulling caterpillar 211 draws the tube from the point 205 in a flattened catenary curve.
  • the endless tube is cut into manageable final pieces, which are caught in a collecting station 213 and prepared for further transport.
EP79200005A 1978-01-19 1979-01-05 Verfahren zur Herstellung eines aussen beschichteten Rohrs aus einem Stahlband und ein nach diesem Verfahren hergestelltes Rohr Withdrawn EP0003369A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7800645 1978-01-19
NL7800645A NL7800645A (nl) 1978-01-19 1978-01-19 Werkwijze en inrichting voor het vervaardigen van uitwendig beklede buis uit staalstrip en aldus vervaardigde buis.

Publications (1)

Publication Number Publication Date
EP0003369A1 true EP0003369A1 (de) 1979-08-08

Family

ID=19830181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79200005A Withdrawn EP0003369A1 (de) 1978-01-19 1979-01-05 Verfahren zur Herstellung eines aussen beschichteten Rohrs aus einem Stahlband und ein nach diesem Verfahren hergestelltes Rohr

Country Status (4)

Country Link
EP (1) EP0003369A1 (de)
ES (1) ES476961A1 (de)
GB (1) GB1604774A (de)
NL (1) NL7800645A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0429147A2 (de) * 1989-09-20 1991-05-29 MANNESMANN Aktiengesellschaft Verfahren und Vorrichtung zum Aufbringen einer Schutzschicht auf einem Stahlrohr
DE4217754A1 (de) * 1992-05-29 1993-12-02 Ema Elektromaschinen Schultze Verfahren und Vorrichtung zum Pulverbeschichten
DE4344951A1 (de) * 1993-12-27 1995-06-29 Mannesmann Ag Verfahren zum dreilagigen Beschichten von metallischen hohlen Formkörpern
WO1996040450A1 (en) * 1995-06-07 1996-12-19 Allied Tube & Conduit Corporation In-line coating and curing a continuously moving welded tube with an organic polymer
DE19635709A1 (de) * 1996-09-03 1998-03-05 Ema Elektro Maschinen Schultze Verfahren zum Beschichten eines Werkstücks
DE19748927A1 (de) * 1997-05-26 1998-12-03 Kruligk Gerd Dipl Ing Verfahren zum Herstellen einer dekorativen oder funktionellen Glasur auf einem aus thermisch beständigem, nichtmetallischem Werkstoff bestehenden Gegenstand
DE10109607A1 (de) * 2001-02-28 2002-09-12 Advanced Photonics Tech Ag Herstellung eines oberflächenbeschichteten massiven Gegenstandes
FR2858945A1 (fr) * 2003-07-24 2005-02-25 Thyssenkrupp Stahl Ag Procede pour fabriquer un element tubulaire metallique renforce selon des sections, notamment pour des structures de support dans des vehicules automobiles
WO2011006343A1 (zh) * 2009-07-15 2011-01-20 Shi Yueming 大型钢管防腐涂层自动涂装工艺及其生产线

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4552091A (en) * 1982-05-03 1985-11-12 Darryl Feder Apparatus for metalizing metal bodies
CN109909756A (zh) * 2019-04-29 2019-06-21 全南阳城机械制造有限公司 一种制管机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2278503A1 (fr) * 1974-06-07 1976-02-13 Inst Trubnoi Promy Procede de realisation d'un revetement de polymere sur des tubes metalliques
US3965551A (en) * 1975-08-14 1976-06-29 Allied Tube & Conduit Corporation Production of polymer-coated steel tubing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2278503A1 (fr) * 1974-06-07 1976-02-13 Inst Trubnoi Promy Procede de realisation d'un revetement de polymere sur des tubes metalliques
US3965551A (en) * 1975-08-14 1976-06-29 Allied Tube & Conduit Corporation Production of polymer-coated steel tubing

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0429147A3 (en) * 1989-09-20 1991-10-16 Mannesmann Aktiengesellschaft Process and device for applying a protective coating onto a steel tube
EP0429147A2 (de) * 1989-09-20 1991-05-29 MANNESMANN Aktiengesellschaft Verfahren und Vorrichtung zum Aufbringen einer Schutzschicht auf einem Stahlrohr
DE4217754C2 (de) * 1992-05-29 1998-04-16 Horst Dr Rettenmaier Verfahren und Vorrichtung zum Pulverbeschichten
DE4217754A1 (de) * 1992-05-29 1993-12-02 Ema Elektromaschinen Schultze Verfahren und Vorrichtung zum Pulverbeschichten
DE4344951A1 (de) * 1993-12-27 1995-06-29 Mannesmann Ag Verfahren zum dreilagigen Beschichten von metallischen hohlen Formkörpern
WO1996040450A1 (en) * 1995-06-07 1996-12-19 Allied Tube & Conduit Corporation In-line coating and curing a continuously moving welded tube with an organic polymer
EP1142650A1 (de) * 1995-06-07 2001-10-10 ALLIED TUBE & CONDUIT CORPORATION In-line Beschichten und Härten von kontinuierlich bewegten geschweissten Rohren mit organischen Polymeren
DE19635709A1 (de) * 1996-09-03 1998-03-05 Ema Elektro Maschinen Schultze Verfahren zum Beschichten eines Werkstücks
DE19748927A1 (de) * 1997-05-26 1998-12-03 Kruligk Gerd Dipl Ing Verfahren zum Herstellen einer dekorativen oder funktionellen Glasur auf einem aus thermisch beständigem, nichtmetallischem Werkstoff bestehenden Gegenstand
DE19748927C2 (de) * 1997-05-26 2000-03-02 Kruligk Gerd Verfahren zum Herstellen einer dekorativen oder funktionellen Glasur auf einem aus wärmebeständigem, nichtmetallischem Werkstoff bestehenden Gegenstand und dessen Anwendung
DE10109607A1 (de) * 2001-02-28 2002-09-12 Advanced Photonics Tech Ag Herstellung eines oberflächenbeschichteten massiven Gegenstandes
DE10109607B4 (de) * 2001-02-28 2005-06-23 Advanced Photonics Technologies Ag Herstellung eines oberflächenbeschichteten massiven Gegenstandes
FR2858945A1 (fr) * 2003-07-24 2005-02-25 Thyssenkrupp Stahl Ag Procede pour fabriquer un element tubulaire metallique renforce selon des sections, notamment pour des structures de support dans des vehicules automobiles
WO2011006343A1 (zh) * 2009-07-15 2011-01-20 Shi Yueming 大型钢管防腐涂层自动涂装工艺及其生产线

Also Published As

Publication number Publication date
NL7800645A (nl) 1979-07-23
GB1604774A (en) 1981-12-16
ES476961A1 (es) 1979-06-16

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Inventor name: DE ZEEUW, JOHAN

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Inventor name: VERMEULEN, JACOB CORNELIS