EP0429147A2 - Procédé et dispositif d'application d'une couche de protection sur un tube en acier - Google Patents

Procédé et dispositif d'application d'une couche de protection sur un tube en acier Download PDF

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Publication number
EP0429147A2
EP0429147A2 EP90250238A EP90250238A EP0429147A2 EP 0429147 A2 EP0429147 A2 EP 0429147A2 EP 90250238 A EP90250238 A EP 90250238A EP 90250238 A EP90250238 A EP 90250238A EP 0429147 A2 EP0429147 A2 EP 0429147A2
Authority
EP
European Patent Office
Prior art keywords
pipe
coating
temperature
baking
curing
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Withdrawn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
EP90250238A
Other languages
German (de)
English (en)
Other versions
EP0429147A3 (en
Inventor
Rolf Dipl.-Ing. Niermann
Georg Dipl.-Ing. Hofmann
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0429147A2 publication Critical patent/EP0429147A2/fr
Publication of EP0429147A3 publication Critical patent/EP0429147A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0209—Multistage baking
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • 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
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/20—Chromatation
    • 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
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • B05D2350/65—Adding a layer before coating metal layer
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment

Definitions

  • the invention relates to a method for applying a chemical and mechanical attack resistant protective layer on a steel tube according to the preamble of the main claim.
  • the metal treatment station is preceded by a rinsing and air drying station.
  • the pipe string Before entering the treatment station for the plastic coating, the pipe string is supported by a pair of rollers and at the outlet by a pull-off auxiliary device, the support width being 21-24 m. In the area of the plastic coating itself, the pipe string is pulled without support at a speed of at least 18 - 21 m / min.
  • the treatment station viewed in the direction of transport, first has an induction heating station, in which the tube material is preheated to a temperature in the range between 66 and 204 degrees Celsius, the preheating temperature being dependent on the powder composition used in the powder booth.
  • the powder booth follows the heating station, in which the powder used is electrostatically applied to the pipe surface.
  • vinyl layer thicknesses of at least 0.1 mm and at most 0.15 mm applied.
  • the powder booth is followed by a heating or heating device in which the powder coating is baked and / or cured.
  • the temperature for this baking is in a range between 93 - 343 degrees Celsius.
  • a cooling station preferably with water quenching, is used to quickly lower the temperature, so that the outer coating is not adversely affected by contact with the peeling auxiliary device immediately downstream.
  • This already known method is not suitable for coating small steel pipes for use as a brake or injection line, since these have to be extremely flexible and compressible. Disadvantages of this method are the strongly fluctuating thickness of the zinc layer as a result of hot-dip galvanizing and the unavoidable damage to the zinc layer by the downstream calibration and straightening station. In addition, the system takes up a lot of space due to its long span and only allows the coating of an endless pipe string.
  • the object of the invention is to provide an improved method for applying a protective layer on a steel tube, with which extremely flexible and compressible protective layers can be produced and with which individual tubes as well as an endless tube string can be coated.
  • the zinc and chromate layer is galvanically applied to the pipe material on the outer surface, the chromating being carried out without current. Thereafter, a powder coating known per se is sprayed dry on the pipe material without prior heating.
  • This powder coating is, for example, an acidic polyester or an epoxy resin or a mixture of the two.
  • the steel tube is also inductively heated in a manner known per se after being sprayed on by means of a coil to a temperature in the range between 250 to 350 degrees Celsius, preferably to 280 degrees Celsius.
  • Essential to the invention is the separate curing of the melted powder layer at a temperature of at least 190 degrees Celsius and a minimum dwell time of 10 seconds, which is lower than the baking temperature.
  • the curing preferably takes place in two different temperature stages, the first stage immediately following the baking having a temperature level of 250 degrees Celsius and the second stage a temperature level of 200 degrees Celsius and the total dwell time in both stages being approximately 20 seconds.
  • the water is rapidly cooled in a known manner. It is so that the plastic layer cannot be damaged or injured at any point during the duration of the procedure known to transport the pipe material without support through the treatment station. Only after the quenching process with water is the layer stable enough, for example to arrange a corresponding support roller, which is preferably made of Teflon or a steel roller provided with a Teflon coating.
  • a corresponding support roller which is preferably made of Teflon or a steel roller provided with a Teflon coating.
  • individual pipes or an endless pipe string can be coated.
  • an extraction tube is provided on the underside of the powder booth, which is provided with a bore.
  • the hole can be more or less closed and thus the air flow in the powder booth can be regulated via the proportion of false air drawn in.
  • the space required for the devices installed in line between the two support rollers and the throughput speed of the pipe string must be coordinated so that, on the one hand, the holding time required for the crosslinking and hardening as a function of the temperature is maintained, and on the other hand, the deflection of the steel pipe to a measure is limited, which guarantees a contact-free passage.
  • the distance between the two support rollers had to be increased further, since otherwise the required holding time was not kept for the curing at the same temperature.
  • an increase in the distance also means a greater deflection, so that there is a risk of contact with the wall of one of the devices. Any damage or injury to the still soft layer then forms a weak point with regard to the corrosive resistance of the coated steel pipe.
  • the temperature for the hardening can also be raised to a certain extent in order to compensate for the shorter holding time which results at a higher throughput speed.
  • a support-free distance in the range of 3 to 4 m is selected for the dimension range of pipes with an outer diameter ⁇ 36 mm.
  • the layers applied to the steel tube are in the range from 12 to 15 ⁇ for the zinc layer, about 5 ⁇ for the chromate layer and 25 to 100 ⁇ , preferably between 40 to 60 ⁇ for the plastic layer, so that there is a total layer thickness in the range from 42 ⁇ to 120 ⁇ results.
  • these layer thicknesses are thick enough to have the required resistance to chemical and / or mechanical attack and, on the other hand, they are thinner in comparison to the known state of the art and therefore cheaper in view of the better mechanical strength of the protective layer during bending and upsetting.
  • the applied layer thicknesses are in the usual tolerance range for the outer pipe diameters used here, so that there are no changes for the further processor with regard to the machine settings and holding devices.
  • the zinc and chromating system can be linked to the plastic coating system, the connection of the individual pipes already taking place before the entry into the galvanizing system and it is necessary that the pipe string, for example, after leaving the chromating system and before entering the plastic coating system is dried with a hot air blower.
  • the throughput speed of the pipe string through the zinc bath determines the cycle time of the overall system, since the galvanic deposition of the prescribed thickness of the zinc layer is the time-determining factor.
  • the pipes which already have a zinc and chromate layer, are first degreased and then dried before entering the plastic coating system so that oil or grease residues still adhering to them are not carried into the coating system.
  • an induction coil is used in a known manner as a heating device.
  • Crosslinking and curing take place, for example, in an electrically heatable muffle furnace, which is followed by a system equipped with infrared radiators.
  • the quenching device can be a water shower in a simple manner.
  • the heat required for baking the powder coating is stored in the pipe to such an extent that it is sufficient for the subsequent crosslinking and curing of the applied plastic. In such a case, both heating devices or only one heating device can be switched off.
  • the steel tubes coated in this way can be bent without any problems with bending radii that can be in the range of 3 x Da or less without that damage to the protective layer occurs. They are also insensitive to treatment in automatic transfer systems, where they are cut, bent and flanged or widened at the ends.
  • the main area of application for these steel pipes coated in this way is exposed hydraulic pneumatic lines in the dimensional range of 5 - 36 mm outer diameter and a wall thickness between 0.5 and 3.0 mm, preferably in the automotive sector.
  • the plastic layers required for mechanical protection can be applied easily and evenly when using the method according to the invention.
  • Steel pipes 10, for example measuring 8 x 1 mm, are electroplated with the appropriate pretreatment in systems not shown here with a 15 ⁇ thick zinc layer and then with an approximately 5 ⁇ thick chromate layer.
  • the pipes 10 pretreated in this way are conveyed to a roller table 2 via a support grid 1 and the individual pipes 10 are connected to one another in the form of a double cone by means of plugs (not shown).
  • the pipe string thus formed is first fed to a cleaning and drying system 3 via the roller table 2. This ensures that, after the galvanic coating with zinc and chrome, grease or oil residues as well as adhering dirt particles do not come through the intervening manipulations be introduced into the coating system.
  • the tubes 10 are driven at a speed of, for example, 3 m per minute by means of a double driver 4, which is also the first support point.
  • the roles of the double driver 4 can be set slightly obliquely, so that the tubing string is slightly rotated in the longitudinal direction.
  • the pipes 10 first pass freely through the powder booth 5, where the powder coating is electrostatically blown onto the pipe surface in a manner known per se.
  • an induction coil 6 is connected directly downstream of the powder booth 5.
  • a steel sheet 12 provided with a bore is arranged between the powder booth 5 and the induction coil 6.
  • the tubes 10 are preferably heated to 280 degrees, so that the powder coating melts or burns in.
  • the thickness of the applied plastic layer is at least 25 ⁇ , preferably 40-60 ⁇ .
  • a heating device 7 is arranged for the crosslinking and curing of the plastic layer. This consists, for example, of an electrically heated muffle furnace and a system equipped with infrared radiators. When this heating device 7 passes through, the tubes 10 are kept in the muffle furnace at a temperature of approximately 250 degrees Celsius and in the infrared radiator region of approximately 200 degrees Celsius with a total cooling time of approximately 20 seconds. The water quenching 8 then follows at a certain distance from the heating device 7.
  • the cooled plastic layer has then reached a hardness which allows the second support point to be arranged in the form of a double driver 9.
  • the distance 11 from the first support point 4 to the second 9 is, for example, 3.5 m. This distance 11 is chosen so that for the smallest pipe to be coated, the resulting deflection reaches a value which means that the pipes 10 pass through the different ones Enables systems without contact.
  • the pipe string is separated again, the plugs connecting the individual pipes 10 being removed and collected. If necessary, the ends are cut off and the finished coated tubes 10 are placed in a trough.
  • the powder booth 5 is sketched in a cross section and in Figure 3 in a section along the line A-A.
  • the spray head 13 for the supply of the powder coating is arranged at the top, while the pipe string 10 moves horizontally in the direction of the arrow 14 below.
  • the lower part of the powder booth 5 is almost completely covered with an intermediate floor 15, only on the sides are slots 16, 16 ', 16 ⁇ , 16 ′′′ provided.
  • the intermediate floor 15 is connected via supports 17, 17 ', 17 über, 17 ′′′ to the floor 18 of the powder booth.
  • a suction pipe 19 is arranged below the intermediate floor 15 and is guided outwards on one side. In a section outside the powder booth 5, the suction pipe 19 has a transverse bore 20 which can be closed by a sleeve 21.
  • the displaceability of the sleeve 21 is indicated by an arrow 22.
  • the suction pipe 19 is connected in its rearward extension via a pipe 23 to a suction device, not shown here.
  • a more or less large part of the transverse bore 20 is released and correspondingly more or less false air is sucked in.
  • the air flow generated by the suction in the powder booth 5 can be regulated in a simple manner depending on the strength of the electrostatic field.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
EP19900250238 1989-09-20 1990-09-17 Process and device for applying a protective coating onto a steel tube Withdrawn EP0429147A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3931822 1989-09-20
DE3931822 1989-09-20
DE4028198 1990-09-03
DE19904028198 DE4028198A1 (de) 1989-09-20 1990-09-03 Verfahren und vorrichtung zum aufbringen einer schutzschicht auf einem stahlrohr

Publications (2)

Publication Number Publication Date
EP0429147A2 true EP0429147A2 (fr) 1991-05-29
EP0429147A3 EP0429147A3 (en) 1991-10-16

Family

ID=25885453

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900250238 Withdrawn EP0429147A3 (en) 1989-09-20 1990-09-17 Process and device for applying a protective coating onto a steel tube

Country Status (2)

Country Link
EP (1) EP0429147A3 (fr)
DE (1) DE4028198A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008048974A1 (de) * 2008-09-25 2010-04-08 Benteler Stahl/Rohr Gmbh Verfahren und Vorrichtung zur Beschichtung von Stahlrohren
US8038829B2 (en) 2006-02-22 2011-10-18 Shawcor Ltd. Coating method for pipe having weld bead
FR3041888A1 (fr) * 2015-10-01 2017-04-07 Soc Fougeraise De Peinture Ind Machine et procede de revetement de peinture pour profiles pvc
CN109107850A (zh) * 2018-10-19 2019-01-01 高密天机械科技有限公司 两用小口径钢管涂塑设备
CN113996459A (zh) * 2020-10-30 2022-02-01 中冶天工集团有限公司 一种防护用脚手管标准化制作装置及使用方法
CN115247250A (zh) * 2021-11-12 2022-10-28 徐州瑞马智能技术有限公司 一种热镀锌钢管用全自动化有序冷却设备

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4344951C2 (de) * 1993-12-27 1997-06-19 Mannesmann Ag Verfahren und Einrichtung zum dreilagigen Beschichten von metallischen hohlen Formkörpern
DE4424768C1 (de) * 1994-07-05 1995-11-09 Kurt Prof Dr Ing Koppe Verfahren und Vorrichtung zum Beschichten von metallischen Beschichtungsträgern mit einem Beschichtungsmittel auf der Basis von Kunststoff
AU5475998A (en) * 1996-11-13 1998-06-03 Ewald Dorken A.G. Process for application of an inorganic coating to an electrically conducting body
DE19648577B4 (de) * 1996-11-23 2005-08-18 Fag Kugelfischer Ag Verfahren zum Korrosionsschutz von Wälzlagern
DE19814632C1 (de) * 1998-03-26 1999-10-14 Mannesmann Ag Verfahren und Vorrichtung zum Aufbringen einer Schutzschicht auf einem langgestreckten Körper, insbesondere Draht oder Rohr
DE102009017921A1 (de) * 2009-04-16 2010-10-21 Siemens Aktiengesellschaft Verfahren zur Herstellung einer Hohlprofil-Stromschiene in Flachprofilausführung mit galvanisch aufgebrachter Schutzschicht

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1456415A (en) * 1974-06-04 1976-11-24 Ural Nii Trubnoi Promy Method of coating metal pipes with a polymeric material
DE2616292A1 (de) * 1975-08-14 1977-02-24 Allied Tube & Conduit Corp Verfahren und vorrichtung zur herstellung von beschichtetem rohrmaterial aus stahlband
FR2344612A1 (fr) * 1976-03-19 1977-10-14 Sekisui Chemical Co Ltd Procede pour former un revetement de resine de poly(sulfure de phenylene)
EP0003369A1 (fr) * 1978-01-19 1979-08-08 Estel Buizen B.V. Procédé de fabrication, à partir d'une bande d'acier, d'un tube à revêtement extérieur et tube obtenu par ce procédé
EP0137663A1 (fr) * 1983-08-25 1985-04-17 Shaw Industries Ltd. Revêtement de résine imperméable à l'humidité et résistant au choc et méthode pour son application

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2046449C3 (de) * 1970-09-21 1975-09-18 Mecano-Bundy Gmbh, 6900 Heidelberg Verfahren und Vorrichtung zum Aufbringen von Schutzüberzügen auf Metallgegenstände n sowie Anwendung des Verfahrens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1456415A (en) * 1974-06-04 1976-11-24 Ural Nii Trubnoi Promy Method of coating metal pipes with a polymeric material
DE2616292A1 (de) * 1975-08-14 1977-02-24 Allied Tube & Conduit Corp Verfahren und vorrichtung zur herstellung von beschichtetem rohrmaterial aus stahlband
FR2344612A1 (fr) * 1976-03-19 1977-10-14 Sekisui Chemical Co Ltd Procede pour former un revetement de resine de poly(sulfure de phenylene)
EP0003369A1 (fr) * 1978-01-19 1979-08-08 Estel Buizen B.V. Procédé de fabrication, à partir d'une bande d'acier, d'un tube à revêtement extérieur et tube obtenu par ce procédé
EP0137663A1 (fr) * 1983-08-25 1985-04-17 Shaw Industries Ltd. Revêtement de résine imperméable à l'humidité et résistant au choc et méthode pour son application

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8038829B2 (en) 2006-02-22 2011-10-18 Shawcor Ltd. Coating method for pipe having weld bead
DE102008048974A1 (de) * 2008-09-25 2010-04-08 Benteler Stahl/Rohr Gmbh Verfahren und Vorrichtung zur Beschichtung von Stahlrohren
DE102008048974B4 (de) * 2008-09-25 2010-07-01 Benteler Stahl/Rohr Gmbh Verfahren und Vorrichtung zur Beschichtung von Stahlrohren
FR3041888A1 (fr) * 2015-10-01 2017-04-07 Soc Fougeraise De Peinture Ind Machine et procede de revetement de peinture pour profiles pvc
CN109107850A (zh) * 2018-10-19 2019-01-01 高密天机械科技有限公司 两用小口径钢管涂塑设备
CN113996459A (zh) * 2020-10-30 2022-02-01 中冶天工集团有限公司 一种防护用脚手管标准化制作装置及使用方法
CN115247250A (zh) * 2021-11-12 2022-10-28 徐州瑞马智能技术有限公司 一种热镀锌钢管用全自动化有序冷却设备

Also Published As

Publication number Publication date
DE4028198C2 (fr) 1993-05-06
DE4028198A1 (de) 1991-03-28
EP0429147A3 (en) 1991-10-16

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