EP0769987A1 - Verfahren und vorrichtung zum beschichten von metallischen beschichtungsträgern mit einem beschichtungsmittel auf der basis von kunststoff - Google Patents
Verfahren und vorrichtung zum beschichten von metallischen beschichtungsträgern mit einem beschichtungsmittel auf der basis von kunststoffInfo
- Publication number
- EP0769987A1 EP0769987A1 EP95925675A EP95925675A EP0769987A1 EP 0769987 A1 EP0769987 A1 EP 0769987A1 EP 95925675 A EP95925675 A EP 95925675A EP 95925675 A EP95925675 A EP 95925675A EP 0769987 A1 EP0769987 A1 EP 0769987A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- carrier
- burner
- coating agent
- gas
- 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.)
- Granted
Links
Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/0207—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
- B05B13/0436—Installations or apparatus for applying liquid or other fluent material to elongated bodies, e.g. light poles, pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/04—Apparatus specially adapted for applying particulate materials to surfaces the particulate material being projected, poured or allowed to flow onto the surface of the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/06—Storage, supply or control of the application of particulate material; Recovery of excess particulate material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
- B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
-
- 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
- B05D3/0218—Pretreatment, e.g. heating the substrate
-
- 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
- B05D3/08—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 flames
Definitions
- the invention relates to a method and a device for coating elongated or slightly curved metallic coating supports with a coating agent based on plastic, preferably powder.
- the surface protection processes for metals that are frequently used in practice are flame spraying and sintering of plastics.
- the powder particles are blown through the flame and melted in the process. This makes them sticky and adheres to the spray surface preheated to approx. 200 ° C.
- flame spraying is carried out manually, with larger areas being coated using the "cruciate tape" method. Flame spraying requires special practical skills from the person to be carried out and represents a physically demanding activity. A further disadvantage is that the flame effect is not sufficient for the desired preheating in the case of greater thicknesses of the coating support, and in many applications an additional preheating is carried out by means of a welding torch must become. The use of a concentrated flame of a fuel gas / oxygen mixture is not possible because of the thermal damage to the plastic powder which occurs as a result. In addition, flame spraying is limited in its work productivity and is mainly used for repair purposes.
- the metallic object to be coated is immersed in a whirled-up plastic powder bath, the object having to be warmed before being immersed.
- the layers are formed by joining the individual plastic particles together by means of a melting process.
- the metallic coating carrier has to be heated outside the sintered pool to a temperature which is clearly above the melting temperature of the plastic.
- the coating substrate is preheated, for example, in air circulation ovens that are electrically, gas or oil-heated, by infrared emitters or in medium-frequency induction ovens.
- the sintering process also includes electrostatic powder coating. Such a method for coating steel pipes is described in DE-A1 26 16 292.
- the pipe to be coated is first galvanized and optionally chromated or phosphated.
- the steel tube is preheated in an induction heating station and the plastic powder is subsequently electrostatically applied in a powder booth.
- the powder booth is followed by a heating device in which the powder coating is baked and / or cured.
- the steel tube coated in this way passes through a cooling station.
- An improvement of this method consists, for example, in heating the tube only after it has been coated with the plastic powder in an induction heating device connected downstream of the powder booth in order to ensure that the powder melts.
- a disadvantage of the known sintering processes is the high expenditure on equipment and the associated costs.
- the heat required to melt the plastic powder is generated by a directly or indirectly heated furnace and is generally passed on to the plastic powder by heating the metal.
- the known heating devices cause high energy consumption and, for technological reasons, considerable heat energy losses occur between the heating of the coating carrier and the powder application.
- a method as described in DE-A1 40 28 198 is only suitable for very thin layer thicknesses. Due to the risk of self-ignition of the coating material or the dust explosion, heating of the coating carrier by means of a concentrated action of flame is not possible.
- the invention had for its object to provide a method for coating elongated straight or slightly curved metallic coating supports with a coating agent, preferably based on plastic powder, which enables a much more cost-effective coating than the previously known methods, in which the Energy consumption can be substantially reduced, with which greater layer thicknesses can be applied without problems and which enables a higher coating performance and in which the risk of dust explosion or combustion phenomena of the coating composition is eliminated. Furthermore, it is an object of the invention to provide the device required to carry out the method.
- the coating carrier is heated locally to a temperature of 80 ° C. to 900 ° C. using a gas flame
- the effective area between the gas flame and the subsequent area for applying the coating agent is sealed, by a partition wall and a barrier layer consisting of non-combustible gaseous medium, which is formed directly between the partition wall and the surface of the coating medium to prevent the air laden with powder or flake dust from igniting,
- the coating agent is applied to the hot metal surface of the coating carrier and
- This method makes it possible for the first time to coat metallic coating substrates by locally heating the coating substrate by means of a gas flame.
- process step d the risk of a dust explosion is completely ruled out and there are no signs of combustion on the plastic powder.
- the plastics suitable per se in the form of powder or flakes can be used as the coating agent.
- the energy consumption can be reduced by approximately 50%.
- the effort for the Coating significantly reduced.
- the coating performance can be increased significantly and the method can be used regardless of location.
- the speed of the coating carrier and / or the coating device can be varied depending on the wall thickness of the coating carrier and the temperature of the gas flame during the heating and coating process.
- the movement of the coating carrier and / or the coating device in the working direction is controlled in such a way that at the beginning of the start-up the speed is reduced during heating in order to compensate for the heat loss caused by convection and heat conduction, and then slowly to the predetermined operating speed increased and shortly before the end of the coating process the speed is further increased.
- the coating support In order to achieve a good quality coating, the coating support must locally have a certain temperature level which must not change significantly during the movement of the coating support in the working direction and the coating.
- the coating carrier rotate, e.g. in pipes, or in an oscillating movement.
- the formation of the barrier layer by at least one continuous air or gas stream, which impacts radially on the surface of the coating carrier and is divided into two partial streams both in the direction of the burner flame and to the coating agent, is of essential importance for successful implementation of the process.
- the barrier layer can also be formed by two separate air or gas streams which are guided directly next to one another.
- This flow of a non-combustible gaseous medium prevents the dust-laden air which forms during the coating from reaching the effective range of the burner flame and igniting.
- the speed of the air or gas flow to form the barrier layer is dimensioned such that the functionality of the burner flame and the coating agent flow are not significantly impaired.
- the cavity can also be heated or thermally insulated to enable the application of thicker layers.
- certain coating powders such as polyethylene, it is advisable to apply an adhesion promoter before melting the powder.
- the non-flammable gaseous media flow constantly monitored and in the event of malfunctions the flame formation is interrupted.
- the device required to carry out the method is characterized by a simple construction and is considerably less expensive than the equipment required for the conventional method.
- the device consists of a clamping device for fixing the coating carrier, a gas-fed burner device acting on the surface of the coating carrier to be coated and a device for supplying a non-combustible gaseous medium and a device for applying the coating agent. Except for the clamping device, these devices are arranged one behind the other in the working direction.
- the device for supplying a non-combustible gaseous medium and the gaseous medium emerging as a barrier layer form an air-impermeable partition between the effective area of the burner device and the device for applying the coating agent.
- a device for applying an adhesion promoter can also be arranged between the device for supplying a non-combustible gaseous medium and the device for applying the coating agent.
- the tensioning device can be coupled to a rotation device and / or to a device for carrying out a longitudinal movement.
- the respective movements are transferred to the coating carrier via the clamping device.
- the individual functional assemblies for coating can be set into a longitudinal and / or rotary movement instead of the coating carrier.
- the burner device can be made rotatable and consist of two burners which are adjustable in the longitudinal direction and movable in the transverse direction. As a result, the axial distance between the burners and the subsequent functional assembly can be set and the burners can be moved together and apart, for which purpose servomotors known per se are used.
- the burner device For coating hollow profiles, e.g. Pipes, the burner device consists of a gas distributor ring with a stationary ring burner and can be adjusted in the longitudinal direction. When coating pipes, it is generally advisable to turn the pipe and move it in the working direction. The other functional modules are then also arranged in a stationary manner.
- the device for supplying a non-combustible gaseous medium is arranged in a stationary manner and consists of an annular nozzle which is connected to connection chambers. Between the exit opening of the ring nozzle and the surface of the coating the carrier is a gap of approx. 3 to 10 mm.
- the ring nozzle can also consist of a stationary housing and a rotatable chamber which is provided with adjustable inserts in the direction of the outlet opening for changing the opening and gap width. This is necessary, for example, if the coating carrier rotates and does not have an annular cross section, as is the case with guardrails.
- the side of the inserts pointing in the direction of the guardrail is adapted to the outer contour of the cross section of the coating carrier.
- a further embodiment variant of the device according to the invention consists in that the burner device, the device for supplying a non-combustible gaseous medium and the device for applying the coating agent are arranged in a coating device which consists of a housing which can be exchanged on its two end faces Inserts are provided which have recesses which are adapted to the outer contour of the cross section of the coating carrier. In this variant, the inserts can also be arranged rotatably.
- the coating device with the associated functional assemblies can be arranged to be movable in the longitudinal direction, for example on a slide. It is also possible to design the coating device as a folding shell design or as two halves which can be firmly locked together. This makes it possible to coat guardrails that have already been assembled on site without having to disassemble them.
- the coating device has a heating chamber and a coating chamber which are separated from one another by the device for supplying a non-combustible gaseous medium and the air emerging from this as a barrier layer.
- a spray gun for applying an adhesion promoter is also arranged in the coating chamber.
- a heat stabilizing element can be arranged in the hollow profile, e.g. an axially movable gas powered burner.
- FIG. 3 shows the coating device in perspective for coating a clamped steel guardrail
- FIG. 4 shows a longitudinal section according to line A-A through the coating device according to FIG. 3 on an enlarged scale
- Fig. 7 is a coating device for external coating of a tube in longitudinal section.
- the coating device 9 consists of a gas-fed burner device 1, a device 2 for supplying a non-combustible gaseous medium and a device 3 for applying the coating agent 4.
- a gas-fed burner device 1 a device 2 for supplying a non-combustible gaseous medium
- a device 3 for applying the coating agent 4 Commercially available burners or spray guns or screening devices known per se can be used as the burner device and device for applying the coating agent be used.
- the device 2 for supplying a non-combustible gaseous medium, such as air, for example, is essential for successful implementation of the method.
- the device 2 is arranged between the burner device 1 and the device 3 for applying the coating agent. All commercially available plastic coating compositions are suitable as coating compositions as powders or flakes.
- the distance between the device 2 and the distillery device 1 and the device 3 for applying the coating agent depends on the size of the diameter or the width and thickness of the metallic coating carrier, the thickness of the layer to be applied and the physical properties of the coating agent.
- the metallic coating carrier 5 is locally heated to a temperature which, depending on the specific boundary conditions, is in a range from 80 ° C. to 900 ° C.
- the heating takes place directly by means of a gas flame, by burning gases with and without the addition of oxygen, for example a C 2 H2-0 2 mixture (acetylene-oxygen).
- the flame temperature reaches values from 1800 ° C to 3500 ° C.
- Propane gas can also be used as fuel gas, whereby due to the low flame temperatures, a lower coating performance is achieved.
- the devices 1, 2, and 3 are preferably arranged in a housing 6, which is shown only schematically in FIG. 1.
- the housing 6 moves the metallic coating carrier 5 continuously in the longitudinal direction, which is indicated by an arrow, the speed being varied as a function of the locally measured temperature of the heated coating carrier. It is also possible to arrange the coating carrier 5 in a stationary manner and to move the housing 6 with the devices 1, 2 and 3 in the longitudinal direction. Inevitably the opposite direction is the working direction. There is no need to arrange the devices 1, 2, and 3 in one housing. It is particularly important that these devices 1, 2 and 3 are arranged at a precisely defined distance from one another.
- an air stream is directed at a precisely determined distance from the burner flame onto the surface of the coating carrier 5 at a specific speed of at least 2 m / s, which after the impact hits the Split surface towards the burner flame and towards the spray gun into two partial flows.
- the outflow speed of the air is dimensioned such that the heating of the profile and the application of the coating agent are not impaired functionally.
- the outer walls of the device for supplying the air and the air emerging from the nozzle, which forms a barrier layer bring about a spatial separation between the effective range of the burner flame and the coating agent application, in such a way that air laden with powder dust does not get into an area which can ignite and lead to a dust explosion. This also prevents combustion phenomena of the coating agent during application.
- the air flow brings about a temperature reduction on the hot coating carrier.
- the air flow is constantly checked during operation and in the event of a malfunction or failure, the flame is automatically suffocated by interrupting the gas supply or by an antioxidant gas.
- FIG. 2 shows the temperature curve t which occurs on the coating carrier during operation as a function of time.
- the metallic coating support reaches a maximum temperature.
- a temperature decrease occurs afterwards, supported by the air supply there is a narrow, optimal temperature range t A for melting the applied powder.
- the melted plastic coating is cooled gently by the ambient air.
- the device for carrying out the method is to be explained in more detail below using the example of the coating of a steel guardrail with reference to FIGS. 3 to 6.
- the steel guardrail 5 as a coating carrier is fixed at the two ends to the fastening bores 7 by means of an intermediate piece in each case in a tensioning device 8.
- the clamping device 8 is rotatably mounted and is rotated about the longitudinal axis together with the steel guardrail 5 by a rotation device, not shown.
- the steel guardrail 5 is not arranged to be displaceable in the longitudinal direction.
- the coating device 9 is arranged on a slide 10 in an axially movable manner.
- the coating device 9 can be designed as a closed design, then before the steel guardrail 5 is fixed it has to be pushed into the coating device 9, or as a two-part folding shell design, and is then put on after the steel guardrail 5 has been fixed.
- the coating device 9 consists of a cylindrical housing 11, which is provided on its two end faces with inserts 12, 12 * rotatable in bearings 33.
- the rotatable inserts 12, 12 ' are interchangeable and have cutouts 13, 13' which are adapted to the outer contour of the cross section of the steel crash barrier 5 and are slightly larger than the cross sectional area of the steel crash barrier 5.
- the two inserts 12, 12 ' are likewise divided into two.
- the burner device 1 and the spray gun 3 are arranged in the interior of the housing 11 of the coating device 9. These are each attached to a link 15, 34 ' , which are guided in movable Garrunge ⁇ 14, 35, and are thus adjustable in the longitudinal and transverse directions.
- the device 2 for supplying the air is fixed between the burner device 1 and the spray gun 3 in the housing 11.
- the device 2 forms a heating chamber 16 and a coating chamber 17 within the coating device 9.
- a collecting trough 18 for falling plastic particles is provided on the bottom of the housing 11.
- the burner device 1 consists of two burners 20, 21 movable in the longitudinal and transverse directions, which are adapted to the outer contour of the cross section of the steel guardrail 5 are.
- the burners 20, 21 are each fastened to links 15 which are movable in the longitudinal direction and which are arranged in brackets 14 in the transverse direction.
- the connecting lines 22 to the burners 20, 21 are designed such that the burners 20, 21 can perform a rotary movement together with the steel crash barrier 5. For example, the burners can also move only half a revolution, are then opened, moved back to the starting position and moved back to the steel guardrail.
- the structure of the device 2 for supplying the air is explained below with reference to FIGS. 5 and 6.
- the device 2 consists of an annular housing 23 which is provided with two connecting chambers 24, 25 for the supply of air.
- the annular housing 23 is fixed in the housing 6 of the coating device 9 and the two connecting chambers 24, 25 project laterally outwards.
- the housing 23 is designed as a ring channel.
- a rotatable chamber 26 oriented in the direction of the steel guardrail 5 is arranged on this housing 23.
- This chamber 26, which is formed in a ring shape, is connected to a chamber ring 27, to which a ball bearing 28 is fastened by means of screws 31, which is mounted in the housing 23.
- a cover 29 with a seal 30 is provided between the rotatable chamber 26 and the fixed housing 23.
- a radially circumferential, nozzle-shaped insert 32 which is displaceable in the direction of the arrow, is attached to the conical outlet of the annular chamber 26. This makes it possible to set the air outlet gap between the insert 32 and the surface of the steel guardrail 5. In addition, the insert 32 can be moved back when the coating device 9 is moved over the clamping device 8.
- the coating device 9 movable on the carriage 10 has been moved back to the starting position, which is located outside the steel guardrail, and is above the tensioning device 8.
- the steel guardrail 5 has the following dimensions, length 4000 mm, width 310 mm, Wall thickness 3 mm.
- the steel guardrail 5 is clamped upright by means of the clamping device 8.
- the burners 20, 21 are moved apart and the insert 32 of the air supply device 2 has also been moved back so far that there is no obstruction due to the larger cross-section of the clamping device.
- the steel guardrail 5 is alternating about its longitudinal axis rotated 45 to 60 ° clockwise and counterclockwise, with a frequency of 60 min " 1.
- the coating device 9 is simultaneously moved at a speed of 40 cm / min in the working direction.
- the longitudinal movement of the coating device 9 is briefly interrupted for 3 s in order to achieve sufficient heating of the front area of the steel guardrail. Then the speed of the coating device is slowly reduced to the above. Value increased.
- the insert 32 is moved in the direction of the surface of the steel guardrail 5, a gap of 5 mm remaining between the insert and the surface.
- the oscillating movement of the steel guardrail 5 is transmitted to the rotatable chamber 26 of the air supply device 2.
- the connecting lines for the burners 20, 21 can also be moved analogously to the steel guardrail 5.
- Air is blown into the two stationary connection chambers 24, 25 of the air supply device 2 and flows onto the surface of the steel guardrail 5 at a speed of 8 to 10 m ⁇ s -1 .
- the air flow divides into two partial flows and simultaneously forms one Barrier layer.
- the two stationary spray guns 3 When the two stationary spray guns 3 reach the steel guardrail, they are automatically switched on and continuously spray the steel guardrail, which has meanwhile cooled to a temperature of 230 ° C., with plastic powder. Rilsan was used as powder and a layer thickness of 150 to 250 ⁇ m is applied to the steel guardrail by melting the plastic powder.
- the burner device 2 When the burner device 2 has reached the end of the steel guardrail 5, the gas supply is automatically switched off and the burners 20, 21 are moved apart. At the same time, the speed of the coating device is increased briefly in order to finally coat the end region within the required temperature level of the steel guardrail.
- the air supply and the spray gun are switched off and the insert 32 of the air supply device 2 is moved outwards.
- the coating device 9 is moved over the clamping device 8 so that the finished coated steel guardrail can be unclamped. All movements of the coating device 9 and the clamping device 8 as well as the ignition and extinguishing of the burner flame, the supply and interruption of the air and the switching on and off of the spray gun can be controlled fully automatically via a computer system, including the safety-related monitoring.
- Commercially available manipulators can be used to insert and remove the steel crash barriers, which are integrated into the overall sequence control.
- the layer thicknesses to be achieved can also be preprogrammed.
- an indirectly heatable furnace with a length of 5 needed. Approx. 210 kW / h of energy are used to heat the guardrail to the required coating temperature. The heating time is 15 to 20 minutes.
- the coating powder is applied in a fluidized bed with a length of 5 m. After vortex sintering, the coated guardrail must also be cooled in a water basin, also 5 m long.
- this guardrail is coated using the method according to the invention, only 116.3 kW / h are consumed for the heating process.
- the period of time for the heating and subsequent coating is about 10 minutes with an average speed of the guardrail of 40 cm / min.
- the cost of the necessary coating equipment is only about 30% compared to the fluidized bed process.
- FIG. 7 shows a coating device for coating a metallic tube with plastic powder in a longitudinal section.
- the coating device 9 consists of a cylindrical housing 11 with interchangeable inserts 12, 12 'arranged on the two end faces, which have recesses 13, 13' through which the pipe 36 to be coated is moved.
- the tube 36 is fixed in a clamping device (not shown in more detail) and is moved in the longitudinal direction and rotates about its longitudinal axis. The directions of movement are marked by corresponding arrows.
- an air supply device 2 is arranged in a stationary manner, which consists of an annular nozzle 37 with connection chambers, not shown.
- the burner device 1 for heating the tube 36 is arranged at a defined distance from the stationary ring nozzle 37. This is attached to a link 15, which is arranged axially adjustable on a bracket 14.
- the burner device 1 consists of a ring burner 39 which is supplied with the fuel gas to form the gas flame via a gas distributor ring 40 and a connecting line 41.
- the distance between the burner device 1 and the air supply device 2 can be set in accordance with the wall thickness of the tube and the process-specific boundary conditions.
- the burner device 1 is arranged in a fixed manner.
- the spray gun 42 is fastened in a link 43 which is arranged in a holder 44 so as to be axially movable. As a result, the axial distance between the application of the adhesion promoter and the air supply device 2 can be changed.
- a screening device is arranged as the coating device 3, through which the coating powder falls onto the hot pipe surface in order to form the desired layer thickness by fusing.
- the tube 36 to be coated rotates about its longitudinal axis.
- the powder which does not adhere to the pipe surface during the powder application falls into a collecting container 45.
- the sieving device 3 is also arranged in a stationary manner.
- the coating powder is fed continuously through an opening provided in the housing 11.
- additional supportive heating of the inner tube surface is advantageous.
- an axially movable ring burner 46 is arranged in the interior of the tube in the area of the powder application. This is fastened to a rigid axle 47 which is supported in a holder 49 movable on rollers 48, the rollers moving on the inner surface of the tube 36.
- the fuel gas is supplied through the central axis 47.
- the clamped tube 36 is rotated at a speed of 0 rpm and moved longitudinally at a speed of 35 cm / min.
- the start of the tube has reached the area of the ring burner 39, it switches on automatically. Since the tube 36 is still cold, either the flame temperature of the ring burner must be increased or the speed of the longitudinal movement is reduced so that the tube can be heated to the desired temperature of approximately 380 ° C.
- the longitudinal movement of the pipe is interrupted for 4 s at the beginning of the flame action on the pipe surface and then slowly increased to 35 cm / min.
- a C2H2-0 2 mixture is used as the fuel gas, the C 2 H2 pressure being 0.5 bar and the 0 2 pressure being 2.5 bar.
- the outflow velocity of the fuel gas is 150 m / s.
- Air supply is also triggered automatically when the beginning of the pipe has reached the outlet area of the nozzle 37.
- the powdery bonding agent Flammulit HP 11 is applied to the pipe surface by means of a tribospray gun 42.
- the tube has a surface temperature of 350 ° C.
- the axial distance between the spray gun 42 and the air supply device 2 is 40 mm.
- the application of the coating powder Flammulit RPE 25/06 begins in the trickling process.
- the inner wall of the tube 36 is still heated so that the surface temperature during the melting of the PE powder is 350 ° C.
- an applied layer thickness of 2 mm is achieved.
- the coating formed in this way is characterized by a high level of adhesive strength and has an excellent surface quality.
- the burner inside the pipe was switched off.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Nozzles (AREA)
- Laminated Bodies (AREA)
- Chemically Coating (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4424768 | 1994-07-05 | ||
DE4424768A DE4424768C1 (de) | 1994-07-05 | 1994-07-05 | Verfahren und Vorrichtung zum Beschichten von metallischen Beschichtungsträgern mit einem Beschichtungsmittel auf der Basis von Kunststoff |
PCT/DE1995/000846 WO1996001156A1 (de) | 1994-07-05 | 1995-07-04 | Verfahren und vorrichtung zum beschichten von metallischen beschichtungsträgern mit einem beschichtungsmittel auf der basis von kunststoff |
Publications (2)
Publication Number | Publication Date |
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EP0769987A1 true EP0769987A1 (de) | 1997-05-02 |
EP0769987B1 EP0769987B1 (de) | 1999-10-06 |
Family
ID=6523079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95925675A Expired - Lifetime EP0769987B1 (de) | 1994-07-05 | 1995-07-04 | Verfahren und vorrichtung zum beschichten von metallischen beschichtungsträgern mit einem beschichtungsmittel auf der basis von kunststoff |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0769987B1 (de) |
AT (1) | ATE185289T1 (de) |
AU (1) | AU2973895A (de) |
DE (2) | DE4424768C1 (de) |
WO (1) | WO1996001156A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2332867B (en) * | 1998-01-05 | 2002-01-30 | Delciana Internat Lmited | Improvements in and relating to steel structural members |
GB2346572B (en) * | 1999-01-27 | 2003-08-20 | Gordon Laurence Banner | Powder coating process for structures |
EP1409153A2 (de) * | 2000-01-24 | 2004-04-21 | Weirton Steel Corporation | Polymerbeschichtetes metallband und verfahren zur herstellung desselben |
DE102006057884B4 (de) * | 2006-12-08 | 2010-08-05 | Wieland-Werke Ag | Verfahren zur Herstellung eines metallischen Leitungsrohrs mit fest anhaftender Kunststoffummantelung |
DE102009049954A1 (de) | 2009-06-19 | 2011-02-17 | Von Ardenne Anlagentechnik Gmbh | Einrichtung zur Temperaturführung von Substraten |
CN104781017B (zh) * | 2012-10-30 | 2017-10-17 | 国立研究开发法人产业技术综合研究所 | 形成在基材上的构造体、构造体的制造方法和线图案 |
FR3027825B1 (fr) * | 2014-11-03 | 2019-04-05 | Compagnie Plastic Omnium | Dispositif de preparation de surface a distance d'une piece |
CN107088507B (zh) * | 2017-04-28 | 2020-02-14 | 芜湖映日科技有限公司 | 调整式三阴极喷枪送粉架 |
JP7035562B2 (ja) * | 2018-01-26 | 2022-03-15 | 日本製鉄株式会社 | フレーム処理装置、塗装金属板の製造装置、および塗装金属板の製造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE30169E (en) * | 1974-01-23 | 1979-12-18 | Method of drying coated webs | |
US3962213A (en) * | 1974-01-23 | 1976-06-08 | Flynn John H | Method of drying coated webs |
US3965551A (en) * | 1975-08-14 | 1976-06-29 | Allied Tube & Conduit Corporation | Production of polymer-coated steel tubing |
FR2399907A1 (fr) * | 1977-08-11 | 1979-03-09 | Pont A Mousson | Procede pour executer par reticulation un revetement en matiere thermoplastique sur un element tubulaire en metal |
DE4028198A1 (de) * | 1989-09-20 | 1991-03-28 | Mannesmann Ag | Verfahren und vorrichtung zum aufbringen einer schutzschicht auf einem stahlrohr |
-
1994
- 1994-07-05 DE DE4424768A patent/DE4424768C1/de not_active Expired - Fee Related
-
1995
- 1995-07-04 EP EP95925675A patent/EP0769987B1/de not_active Expired - Lifetime
- 1995-07-04 WO PCT/DE1995/000846 patent/WO1996001156A1/de active IP Right Grant
- 1995-07-04 AU AU29738/95A patent/AU2973895A/en not_active Abandoned
- 1995-07-04 AT AT95925675T patent/ATE185289T1/de not_active IP Right Cessation
- 1995-07-04 DE DE59507000T patent/DE59507000D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9601156A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU2973895A (en) | 1996-01-25 |
EP0769987B1 (de) | 1999-10-06 |
WO1996001156A1 (de) | 1996-01-18 |
ATE185289T1 (de) | 1999-10-15 |
DE59507000D1 (de) | 1999-11-11 |
DE4424768C1 (de) | 1995-11-09 |
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