EP2177276A1 - Procédé pour la peinture de carrosséries de véhicules - Google Patents
Procédé pour la peinture de carrosséries de véhicules Download PDFInfo
- Publication number
- EP2177276A1 EP2177276A1 EP08425668A EP08425668A EP2177276A1 EP 2177276 A1 EP2177276 A1 EP 2177276A1 EP 08425668 A EP08425668 A EP 08425668A EP 08425668 A EP08425668 A EP 08425668A EP 2177276 A1 EP2177276 A1 EP 2177276A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coat
- base paint
- primer
- drying
- waterborne base
- 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- Withdrawn
Links
- 238000010422 painting Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000003973 paint Substances 0.000 claims abstract description 116
- 238000001035 drying Methods 0.000 claims abstract description 69
- 230000005855 radiation Effects 0.000 claims abstract description 47
- 238000000295 emission spectrum Methods 0.000 claims abstract description 33
- 230000003197 catalytic effect Effects 0.000 claims abstract description 27
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000001301 oxygen Substances 0.000 claims abstract description 20
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 20
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 16
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 16
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 15
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 11
- 239000000945 filler Substances 0.000 claims description 56
- 239000000203 mixture Substances 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 5
- 238000009830 intercalation Methods 0.000 claims 1
- 238000005507 spraying Methods 0.000 description 14
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000009828 non-uniform distribution Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000001935 peptisation Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
- F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
- F26B3/305—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements the infrared radiation being generated by combustion or combustion gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
-
- 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
- B05D2451/00—Type of carrier, type of coating (Multilayers)
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
- F26B2210/12—Vehicle bodies, e.g. after being painted
Definitions
- the application of the wet-on-wet primer substantially comprises the steps of:
- the above-described painting cycle may be carried out, with regards to the steps of drying, by means of a complex, costly drying apparatus comprising a plurality of devices for drying the various painting products, i.e. an IR lamp, a blower or a compressed air gun and an oven booth.
- a complex, costly drying apparatus comprising a plurality of devices for drying the various painting products, i.e. an IR lamp, a blower or a compressed air gun and an oven booth.
- the method for painting the bodywork of a vehicle comprises, in general, applying a plurality of painting products, such as a body filler, a primer, a waterborne base paint and a clear top paint, on the surface of at least one portion of the bodywork to be repaired, according to new application sequence of layers of such painting products, and following up the application of each painting product with a corresponding step of drying of the painting product.
- a plurality of painting products such as a body filler, a primer, a waterborne base paint and a clear top paint
- the apparatus 1 comprises a drying booth 3, which extends along a longitudinal axis A according to a preferably, but not necessarily, parallelepiped shape and is provided with a horizontal base 4 having a preferably, but not necessarily, rectangular shape.
- the motor vehicle, the bodywork 2 of which is concerned by the applied paint drying treatment, is placed over the base 4.
- the radiating assembly 6 comprises a plurality of radiating devices 7 mounted on the gantry structure 5 so as to be arranged substantially facing the external upper and side surfaces of the bodywork 2.
- Each radiating device 7 comprises a box-like containing frame 7a (shown in a detail of figure 1 ) made, for example, of stainless steel, and at least one catalytic panel 8 having an substantially rectangular shape and accommodated inside the box-like frame 7a.
- each radiating device 7 comprises two catalytic panels 8 accommodated in the box-like structure 7a so as to form a larger radiating surface than that offered by a single catalytic panel 8, so as to adapt to the size and shape of the bodywork 2.
- FIGS 2 and 3 show a particular embodiment of the catalytic panel 8, which has an substantially rectangular shape and comprises: a catalyzing support or bed 11 of known type preferably made of ceramic material doped with a catalyzing material, e.g. a noble metal consisting of platinum; a preheating resistor (not shown) adapted to take the catalyzing support 11 to a specific temperature so as to activate it before the hydrocarbon gas is fed to the catalytic panel 8; and a porous support of known type, and thus not shown, facing the catalyzing support 11 to receive the hydrocarbon gas and uniformly distribute it on an external, substantially flat surface 12 of the catalyzing support 11 itself.
- a catalyzing support or bed 11 of known type preferably made of ceramic material doped with a catalyzing material, e.g. a noble metal consisting of platinum
- a preheating resistor not shown
- a porous support of known type, and thus not shown, facing the catalyzing support 11 to receive the hydrocarbon
- the catalyzing support 11 is structured to be crossed by the hydrocarbon gas in order to be able to break down the molecules of hydrocarbon into atoms of hydrogen and carbon, thus causing a flameless exothermic reaction between the hydrogen, the carbon and the oxygen present in the air on the surface 12, which reaction generates carbon dioxide, aqueous vapor and energy in form of electromagnetic waves in the infrared band.
- the infrared radiations generated by such a catalytic panel 8 are emitted according to a first emission spectrum distributed over a relatively narrow range of wavelengths in the short-wavelength infrared band.
- each radiating device 7 comprises an air supplying device adapted to blow a mixture of air and oxygen onto the radiating panels 8 and to adjust the supplying of such a mixture of air and oxygen upon the control by the control unit 10.
- Mixture of air and oxygen hereinafter means a mixture of compressed air and pure oxygen, in which the percentage of compressed air may vary from 0% to 100% and, vice versa, the percentage of pure oxygen may vary from 100% to 0%.
- the mixture of air and oxygen may also be formed either by compressed air only, or by pure oxygen only.
- reference will be made hereinafter to the case of a mixture containing compressed air only because the use of oxygen does not imply any substantial variation to the apparatus 1, and is however more dangerous than the use of compressed air.
- compressed air provides a high amount of oxygen in any case, but it is not as flammable as pure oxygen.
- the air supplying device comprises two supplying pipes 13, each mounted on a respective catalytic panel 8, and each having a respective plurality of openings or holes 14, through which compressed air is blown.
- the holes 14 are reciprocally aligned in positions substantially facing the surface 12 to blow compressed air onto the surface 12 in directions substantially parallel to the surface 12 itself, so as to influence the mentioned catalytic reaction, and specifically to locally boost such a catalytic reaction and cause a variation in the infrared radiation emission spectrum.
- each supplying pipe 13 extends along an axis B parallel to the larger side edge of the catalytic support 11.
- the holes 14 are distributed on the supplying pipe 13 with the respective axes being orthogonal to the axis B and laying on a plane substantially parallel to the surface 12 of the catalyzing support 11.
- the box-like frame 7a has an open side which is protected by a grid 7b and which is adapted to face the painted bodywork 2.
- the catalytic panel 8 is arranged with the surface 12 of the catalytic support 11 facing said open side.
- the supplying pipe 13 and the holes 14 are dimensioned so that the compressed air blown onto the catalytic panel 8 generates, in use, turbulences on the surface 12 such as to distribute the oxygen contained in the blown air in a non-uniform manner on the surface 12 itself.
- the diameter of the holes 14 is in the range of one fifth - one third of the diameter of said supplying pipe 13.
- a high temperature corresponds to a high concentration of oxygen, and thus to an infrared radiation generation having a wavelength close to 0.7 ⁇ m
- a relatively low temperature corresponds to a reduced concentration of oxygen, and thus to a generation of infrared radiations having a wavelength close to 3.5 ⁇ m.
- the second emission spectrum generated in the above-described manner allows to transfer a percentage of radiated energy up to 80% to the paint, regardless of the type of paint or painting product applied onto the bodywork 2, because the emission spectrum distributed in the mentioned wavelength range is compatible with a multiplicity of paint or painting product molecules.
- the radiating assembly 6 comprises at least one pair of side radiating devices 7, which are arranged on opposite sides with respect to the middle plane so as to face the side surfaces of the bodywork 2 in use, and at least one upper radiating device 7, which is arranged in a substantially horizontal position between the side radiating devices 7 so as to face the upper surface of the bodywork 2 in used.
- a first of two catalytic panels 8 is in a substantially vertical position, while the second catalytic panel 8 is firmly fixed to the upper end of the first radiating panel 8 and is inclined with respect to the latter towards the middle plane of the gantry structure 5.
- the two catalytic panels 8 are reciprocally aligned.
- the upper radiating device 7 is mounted to the horizontal beam 15 by means of a further pair of slides 19, which are slidingly mounted on respective vertical guides 20 integral with the horizontal beam 15 and placed on opposite sides with respect to the middle plane of the gantry structure 5 to allow the upper radiating device 7 to translate vertically either away from or towards the base 4 so as move either to or away from the upper surface of the bodywork 2. Furthermore, the upper radiating device 7 is connected to the slides 19, so as to be able to rotate about an axis C substantially parallel to the base 4, and thus substantially orthogonal to the mentioned middle plane.
- the side radiating devices 7 are mounted to the horizontal beam 15 by means of respective arms 21, only one of which is visible in figure 1 , slidingly mounted along the horizontal beam 15 to allow each side radiating device 7 to translate along a direction transversal to the longitudinal axis A, from and to the middle plane so as to move either away from or towards a side surface of the bodywork 2.
- the gantry structure 5 further comprises a plurality of electromechanical actuators (not shown) of known type adapted to drive, upon the control by the control unit 10, the slides 16 for translating the horizontal beam 15 along the direction D, the slides 19 for translating the upper radiating device 7 away from and towards the base 4, and the arms 21 for translating the side radiating devices 7 away from and towards the middle plane, and to rotate the upper radiating device 7 about the axis C.
- electromechanical actuators not shown
- the control unit 10 comprises a memory (not shown) for storing a series of drying recipes in form of data tables, each of which is univocally associated to a specific paint and comprises an optimal paint drying temperature and an optimal exposure time interval of the paint to the aforesaid second infrared radiation emission spectrum, and a control module, e.g. a keypad, for allowing a user to select the type of paint applied onto the bodywork 2.
- a memory not shown
- a control module e.g. a keypad
- the control unit 10 is further configured to control and coordinate the different operating steps of the apparatus 1 operation, and specifically for actuating the various electromechanical actuators of the apparatus 1 and for adjusting the flow rate and/or pressure of the hydrocarbon gas and compressed air fed to the various radiating devices 7 according to the paint temperature in the various portions of the bodywork 2, acquired by means of temperature sensors 9 so as to meet the requirements of the selected drying recipe.
- the adjustment of the flow rate and/or of the compressed air pressure consists in an open/closed (on/off) adjustment for switching the emission spectrum generated by the radiating devices 7 from the first emission spectrum to the second emission spectrum. More specifically, if the measured temperature is higher than the optimal temperature by a given margin, the feeding of the compressed air to the corresponding catalytic panels 8 is interrupted so as to restrict the infrared radiation emission spectrum, and i.e. for generating the mentioned first infrared radiation emission spectrum. Instead, if the measured temperature is lower than the optimal temperature by a given margin, the feeding of the compressed air to the corresponding catalytic panels 8 is allowed in order to broaden the infrared radiation emission spectrum, and i.e. for generating the mentioned second infrared radiation emission spectrum.
- the method for painting the bodywork of a vehicle according to the present invention is shown in the flow chart in figures 4 and 5 , and includes applying a plurality of painting products, such as a body filler, a primer, a waterborne base paint and a clear top paint, onto the surface of a bodywork portion to be repaired according to a particular sequence of applications of layers or coats of the various painting products intercalated between steps of drying carried out by means of the apparatus 1, i.e. by employing the above-described radiating devices 7.
- the application times of the painting products shown hereinafter are to be referred to a bodywork portion with a 1 square meter surface.
- the painting method is initially differentiated according to whether the bodywork portion to be repaired is a damaged portion to be touched up or a new portion for replacing the damaged one: in the first case (NO criterion in block 100), the body filler must be applied beforehand to restore the original shape of the bodywork portion; instead, no body filler is required in the second case (YES criterion in block 100).
- the method comprises applying a first layer of body filler having a thickness in the range of 400 - 600 ⁇ m on the surface of the portion of bodywork to be repaired, by operating a rather strong pressure on the surface (block 101).
- the time required for completing such an operation is approximately 30 s, assuming an extension of the body filler of approximately 0.25 square meters.
- the first layer of body filler is immediately dried by exposing it to the infrared radiations generated by the radiating device 7 for an exposure time ET1 in the range of 30 - 40 s taking the body filler to a temperature T1 in the range of 80 - 90°C, and preferably of 85°C (block 102).
- a plurality of further layers of body filler having substantially the same thickness as the first layer of body filler are applied over each other starting from a first layer of body filler to reach the desired thickness (block 103). Waiting periods, each having a value in the range of 10 - 15 s, are intercalated between applications of the further layers of body filler so as to allow a certain hardening of the body filler. The time required to complete such an operation is in the range of 2 - 3 minutes.
- the further layers of body filler are immediately dried by means of the infrared radiations generated by the radiating device 7 for an exposure time ET2 in the range of - and 50 s, taking the body filler to a temperature T2 in the range of 90 - 100°C, and preferably of 100°C, so as to obtain a total reticulation of the body filler (block 104).
- the body filler is sanded (block 105) at the end of the exposure time ET2.
- a first coat (half coat) of primer having a thickness in the range of 20 - 30 ⁇ m (block 106) is applied by spraying or by means of a roller thereon.
- the time required to apply the primer coat is approximately 1 minute.
- the first primer coat is immediately dried by exposing it to the infrared radiations generated by the radiating device 7 for an exposure time ET3 in the range of 20 - 30 s taking the primer to a temperature T3 in the range of 80 - 90°C, and preferably of 85°C (block 107).
- a second coat of primer having a thickness in the range of 30 - 40 ⁇ m (block 108) is applied on the first primer coat by spraying or by means of a roller when its temperature is still at least of 50°C.
- the second primer coat is immediately dried by exposing it to the infrared radiations generated by the radiating device 7 for an exposure time ET4 in the range of 30 - 40 s taking the primer to a temperature T4 in the range of 105 - 115°C, and preferably of 110°C (block 109).
- a third coat of primer having the same thickness as the second coat (block 110) is applied on the second primer coat by spraying or by means of a roller when its temperature is still at least of 50°C.
- the third primer coat is also immediately dried by exposing it to the infrared radiations generated by the radiating device 7 for the exposure time ET4 so as to take the primer to the temperature T4 (block 111).
- a step of sanding which comprises a single passing with a P400-grit sandpaper follows (block 112).
- the method comprises directly applying a coat of wet-on-wet primer having a thickness in the range of 20 - 30 ⁇ m (block 113) onto the new bodywork portion by spraying or by means of a roller.
- the time required for applying the coat of wet-on-wet primer is approximately 1 minute.
- the coat of wet-on-wet primer is immediately dried by exposing it to the infrared radiations generated by the radiating device 7 for an exposure time ET5 in the range of 40 - 30 s taking the wet-on-wet primer to a temperature T5 in the range of 80 - 90°C, and preferably of 85°C (block 114).
- the wet-on-wet primer is cooled for a time sufficient to reach a temperature of 35°C (block 115).
- half a coat of waterborne base paint having a thickness in the range of 5 - 10 ⁇ m (block 116) is immediately applied by spraying on the dried, sanded primer or on the dried wet-on-wet primer.
- a full coat of waterborne base paint having a thickness in the range of 10 - 15 ⁇ m (block 117) is applied by spraying on the half coat of waterborne base paint immediately thereafter.
- the time required for applying the two coats of waterborne base paint is approximately 3 minutes.
- the base paint is dried by exposing it to the infrared radiations generated by the radiating device 7 for an exposure time ET6 in the range of 30 - 40 s taking the base paint to a temperature T6 in the range of 60 - 70°C, and preferably of 65°C (block 118).
- the waterborne base paint is cooled down for a time sufficient to reach a temperature of 30°C (block 119).
- a shaded coat of waterborne base paint having a thickness in the range of 2 - 4 ⁇ m (block 120) is applied on the full coat of the waterborne base paint at the temperature of 30°C.
- the application time of the drop coat of the base paint is approximately 1 minute and a half.
- the base paint is dried by exposing it to the infrared radiations generated by the radiating device 7 for an exposure time ET7 in the range of 15 - 20 s taking the base paint to a temperature T7 in the range of 45 - 55°C, and preferably of 50°C (block 121).
- the waterborne base paint is cooled down again for a time sufficient to reach a temperature of 35°C (block 122).
- half a coat of clear top paint having a thickness in the range of 15 - 20 ⁇ m (block 123) is applied by spraying.
- a full coat of clear top paint having a thickness in the range of 40 - 50 ⁇ m (block 124) is applied by spraying on the half coat of clear top paint immediately thereafter.
- the time required for applying the two coats of clear top paint is approximately 4 and a half minutes.
- the clear top paint is dried by exposing it to the infrared radiations generated by the radiating device 7 for an exposure time ET8 in the range of 40 - 50 s taking the base paint to a temperature T8 in the range of 115 - 125°C, and preferably of 120°C (block 125).
- the paintwork is to be considered complete only after having left the clear top paint cool down for a time sufficient to reach a temperature in the range of 30 - 35°C (block 126).
- the painting method differs from the embodiment shown in figure 4 and described above in that the shaded coat of waterborne base paint is applied directly onto the wet surface, i.e. immediately after having applied the full coat, rather than onto the dry surface.
- the shaded coat of waterborne base paint is applied directly onto the wet surface, i.e. immediately after having applied the full coat, rather than onto the dry surface.
- the steps of drying and cooling the waterborne base paint indicated by blocks 118 and 119, respectively, in the flow chart in figure 5 are not included, and the subsequent step of drying the waterborne base paint, i.e. shown in block 121 in figure 5 , is modified in its carrying out time, i.e.
- the base paint is dried by exposing it to the infrared radiations generated by the radiating device 7 for a different exposure time ET9 in the range of 30 - 40 s taking the base paint itself to a temperature T9 in the range of 65 - 75°C, and preferably of 70°C.
- the main advantage of the method for painting the bodywork according to the present invention is the drastic reduction, of approximately 90%, of the drying times of each painting product without deteriorating the features of the same.
- Such a drastic reduction of the drying times is made possible by the particular infrared radiation emission spectrum (second emission spectrum) generated by the radiating devices 7 by blowing the compressed air on the corresponding catalytic panels 8 fed with hydrocarbon gas.
- the second emission spectrum being distributed in the entire short-wavelength infrared band, allows any painting product to be optimally dried, making the new application sequence of layers of the various painting products described above possible, which implies a drastic reduction, of approximately 80%, of the total application and finishing times of each painting product.
- the particular drying technique suppresses the need for hardening times either between one coat and the next of the same painting product (e.g. the primer), or between two different painting products (e.g. between the last waterborne base paint and the first clear top paint), and thus allows a continuous application of the various painting products on the hot support resulting in an enormously speeding up of the entire painting cycle.
- the particular technique allows to facilitate the modeling of the surface to be reconstructed by means of the body filler and to reduce the porosity of the filled surface. As a consequence, the surface of the damaged bodywork portion may be reconstructed in a single cycle consisting in the body filler application and sanding, while by using the known techniques the application and sanding cycle must be repeated at least twice.
- the method for painting the bodywork of the present invention is based on the use of a single type of device, i.e. the radiating device 7, for drying any painting product. It is indeed sufficient to vary some parameters, such as for example the exposure time to the infrared radiation and the desired temperature, to adapt the radiating device 7 to the various painting products used, such as the body filler, the primer, the waterborne base paint and the clear top paint. This contributes to simplify and speed up the whole painting cycle.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08425668A EP2177276A1 (fr) | 2008-10-15 | 2008-10-15 | Procédé pour la peinture de carrosséries de véhicules |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08425668A EP2177276A1 (fr) | 2008-10-15 | 2008-10-15 | Procédé pour la peinture de carrosséries de véhicules |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2177276A1 true EP2177276A1 (fr) | 2010-04-21 |
Family
ID=40336458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08425668A Withdrawn EP2177276A1 (fr) | 2008-10-15 | 2008-10-15 | Procédé pour la peinture de carrosséries de véhicules |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP2177276A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013095274A1 (fr) * | 2011-12-20 | 2013-06-27 | Pivab Ab | Aménagement pour séchage de peinture |
CN105486076A (zh) * | 2016-01-19 | 2016-04-13 | 周海波 | 模块化客车燃气催化无焰红外辐射加热快速烘干室 |
CN106391420A (zh) * | 2016-10-31 | 2017-02-15 | 苏州格瑞涂装科技有限公司 | 一种天然气触媒催化燃烧中波红外辐射的加热固化方法及其设备 |
CN110280427A (zh) * | 2019-03-26 | 2019-09-27 | 台荣建材(湖州)有限公司 | 一种硅酸钙板表面处理设备 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030129300A1 (en) * | 2001-09-25 | 2003-07-10 | Toshikazu Okada | Repair coating method |
US20040123491A1 (en) * | 2002-09-16 | 2004-07-01 | Heiko Schneider | Drier for objects, particularly for vehicle bodies, and method for operating such a drier |
-
2008
- 2008-10-15 EP EP08425668A patent/EP2177276A1/fr not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2013095274A1 (fr) * | 2011-12-20 | 2013-06-27 | Pivab Ab | Aménagement pour séchage de peinture |
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CN106391420A (zh) * | 2016-10-31 | 2017-02-15 | 苏州格瑞涂装科技有限公司 | 一种天然气触媒催化燃烧中波红外辐射的加热固化方法及其设备 |
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