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WO2000022421A1 - Detection et determination automatiques de residus huileux - Google Patents

Detection et determination automatiques de residus huileux Download PDF

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Publication number
WO2000022421A1
WO2000022421A1 PCT/EP1999/007272 EP9907272W WO0022421A1 WO 2000022421 A1 WO2000022421 A1 WO 2000022421A1 EP 9907272 W EP9907272 W EP 9907272W WO 0022421 A1 WO0022421 A1 WO 0022421A1
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WO
WIPO (PCT)
Prior art keywords
oil
cleaning
radiation
sub
intensity
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.)
Ceased
Application number
PCT/EP1999/007272
Other languages
German (de)
English (en)
Inventor
Andrea Wimschneider
Wolfgang Krey
Ibolya Bartik-Himmler
Hans-Willi Kling
Andreas THÜNCHEN
Bernd Mayer
Werner Opitz
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Priority to AU63317/99A priority Critical patent/AU6331799A/en
Publication of WO2000022421A1 publication Critical patent/WO2000022421A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
    • G01N21/643—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" non-biological material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/94—Investigating contamination, e.g. dust

Definitions

  • the invention is in the field of cleaning hard surfaces in industrial production processes.
  • the invention relates to metallic surfaces, which are coated with anti-corrosion oils or with oils, the shaping processes such as rolling, forming, drawing. Cold extrusion or machining facilitate.
  • the invention relates to that part of an industrial production chain in which this oil is to be at least largely removed from the surfaces by cleaning, in order then to subject the surfaces to further treatment such as chemical conversion (conversion treatment) or coating.
  • the conversion treatment can be, for example, layer-forming or non-layer-forming phosphating, chromating, anodizing or treatment with solutions which contain transition metal ions and / or simple and / or complex-bound fluorides and / or their acids.
  • a coating is the coating with organic polymers or with those organic substances which crosslink when heated and / or when irradiated with infrared, visible or ultraviolet radiation with polymer formation (for example a coating), or the coating with metallic layers, for example a coating with metallic zinc, nickel, chrome, aluminum or with alloys, each consisting of at least 50% of one of the elements mentioned.
  • Processing steps of chemical conversion treatment and / or coating have to remove these oils at least to a sufficient extent by means of suitable cleaning solutions that residual oil quantities remaining on the surfaces do not adversely affect the subsequent process steps.
  • the present type of oil can be recognized by comparison and, on the other hand, the surface coverage with this oil can be determined in the quantity range of g / m.
  • this document does not address the task of determining residual oil quantities on the surface after they have been cleaned.
  • the last-mentioned problem cannot be solved with the method set out in the document mentioned, since the amount of oil in the quantity range significantly below 1 g / m "is far too small to be able to be determined with sufficient accuracy by the weak fluorescent radiation of the oil.
  • US 3 899 213 discloses a technique with which the type of oil, for example marine oil pollution, can be recognized from a remote location.
  • the oil is irradiated with light and the frequency spectrum of the fluorescent radiation is measured. The problem of technical cleaning and the control of detergent baths is not addressed here.
  • US 5 807 605 describes a method by which the presence of a lubricant layer on an object can be recognized. For this, a fluorescent lubricant is used, the surface of the object is irradiated with light and the fluorescent radiation of the lubricant is used to conclude that the surface is evenly coated.
  • DE-A-39 23 825 relates to a method for checking the presence, quantity and condition of a lubricating film between parts moving relative to one another. For example, a fluorescent substance is added to the lubricant, the fluorescence is excited and the presence and condition of the lubricant film is deduced from the fluorescent radiation.
  • DE-A-42 20 392 relates to an exercise case for the detection of the decontamination of chemical poisons, in particular chemical ones Warfare agents.
  • Fluorescent substances are used as exercise substances, the presence of which can be determined by the fluorescent radiation.
  • DE-A-196 49 925 discloses a method for the quantitative testing of the cleaning of objects. This method is distinguished by the fact that a test specimen is contaminated in a defined manner while applying a fluorescence-active substance, for example, and then cleaned, disinfected and / or sterilized, and that the amount of test substance remaining on the test specimen after these processes is determined on the basis of the fluorescent radiation. This allows the efficiency of the cleaning step to be checked. However, this does not disclose an automatic process sequence for checking and controlling the cleaning process.
  • US 5 001 353 relates to a method with which the thickness of a coating film, for example an oil film, can be recognized on a running metal strip.
  • the oil layer is irradiated with ultraviolet radiation and the fluorescence radiation is measured.
  • the thickness of the covering is deduced from the intensity of the fluorescent radiation. The problem of controlling technical cleaning baths is not addressed here.
  • DD 94 910 relates to a method for the fluorometric measurement of low oil contents in carrier liquids. Such a method serves for the continuous and instantaneous monitoring of the oil content in operating processes in which contamination of a carrier liquid with oil can occur, a certain oil content of the carrier liquid not being allowed to be exceeded. The problem of cleaning surfaces and controlling the detergent baths used here is not addressed here.
  • DE-U-297 00 253 relates to a monitoring device for the detection of substances with fluorescent substances on surfaces of liquids or solids, with light source and receiver for light reflected by a fluorescent substance and emitted by the light source. This invention relates to a special design of the light source.
  • US 5 225 675 relates to a method to improve the cleaning of metal parts.
  • a fluorescent dye is added to a metal treatment solution and the metal is treated with this solution.
  • the metal is now deformed and the treatment solution is then cleaned off the metal surface.
  • the cleaned metal object is irradiated with radiation that can stimulate the fluorescence of the dye.
  • the fluorescence is checked optically to assess the effectiveness of the cleaning step.
  • this does not disclose a program-controlled procedure for checking and controlling the cleaning bath.
  • the subtasks mentioned are solved according to the invention in the context of industrial cleaning of oil-coated surfaces a method for the detection of self-fluorescent oil types on surfaces before cleaning them and / or for determining the residual oil load on surfaces after cleaning them, whereby a) for determining the residual oil load, the oil is mixed with a substance prior to cleaning the surface which Irradiation with visible light or with ultraviolet radiation emits fluorescent radiation, b) the surface covered with the oil is irradiated with visible light or with ultraviolet radiation.
  • the intensity of the fluorescent radiation emitted by the surface covered with oil is measured either in the case of measuring the fluorescence of the substance added in sub-step a) at a preselected wavelength or in the case of measuring the inherent fluorescence of the oil, the wavelength dependence of the intensity of the fluorescent radiation is measured, and d ) either in the case of measuring the fluorescence of the substance added in sub-step a) from the intensity of the fluorescent radiation at a preselected wavelength, the residual oil loading of the surface, or in the case of measuring the inherent fluorescence of the oil from the wavelength dependence of the intensity of the fluorescent radiation, the type of oil on the surface recognizes, the sub-steps b) to d) run automatically under program control and the result of the sub-step d) is output locally or at a remote location or is stored on a data carrier for further processing and / or depending on Result of sub-step d) a warning signal is generated locally or at a remote location and / or a check is automatically initiated on the composition of the cleaning solution used
  • tracers are used to control the amount of conditioning agents in aqueous
  • the tracers must be sufficiently oil-soluble.
  • the surface covered with oil is irradiated with visible light or preferably with ultraviolet radiation and the intensity of the fluorescent radiation emitted from the surface covered with oil is measured with a suitable measuring device.
  • the preferred procedure is to arrange one or more, preferably 4, sources of visible light or ultraviolet radiation in the vicinity of the measuring element, which measures the intensity of the fluorescent radiation.
  • sources of visible light or ultraviolet radiation By means of several light or UV radiation sources, which are arranged around the measuring element for measuring the fluorescence radiation, a particularly uniform irradiation of the surface section whose fluorescence radiation is to be measured can be achieved. This prevents or at least reduces adulteration caused by shadowing.
  • a photocell sensitive to the selected measuring range is preferably used, which is equipped or connected to a photomultiplier.
  • the current supplied by the photomultiplier is proportional to the intensity of the fluorescent radiation and can therefore be used as a measure of this intensity of the fluorescent radiation and processed further.
  • the entry opening for the photocell is expediently closed with a film or disk, for example made of plastic or glass, which is intended to prevent contamination of the actual photocell in the industrial environment.
  • this film or disk must be sufficiently transparent to the fluorescent radiation to be measured.
  • the measurement of the Fluorescence radiation takes place in an area of high air humidity, which is to be expected, for example, in the vicinity of a cleaning bath, if moisture condensation should be prevented on the film or pane ⁇ ' .
  • This can be achieved, for example, by blowing them off continuously or discontinuously with a heated air flow if necessary.
  • the size of the measuring spot on the surface depends on the one hand on the distance of the measuring element from the surface and on the other hand on its opening angle. A larger area of the surface is detected the further the element is from the surface. Conversely, however, since the intensity of the measured fluorescence radiation decreases with the square of the distance of the measuring element from the surface, it is recommended for the most exact possible intensity measurement to bring the measuring element as close as possible to the surface.
  • a distance between the measuring element and the surface is advisable to set a distance between the measuring element and the surface of approximately 30 up to about 50 cm, for example of about 40 cm.
  • the calibration can be carried out by covering surfaces with different types of oil and recording the wavelength dependence of the intensity of the fluorescent radiation of the respective type of oil and storing it on a data carrier.
  • the calibration is preferably carried out by choosing the material in which the residual oil loading of the substrate surface is to be determined later, and covering the surface of the substrate with defined amounts of the tracer substance.
  • the tracer can either be dissolved in the oil to be cleaned later or in any other solvent. It is only important to apply a defined amount of tracer to the surface. This can be done, for example, by preparing a solution of the tracer with a known concentration and applying this solution to the surface, for example using a doctor blade with a defined layer thickness and thus with a defined amount. From the measurement of the intensity of the fluorescent radiation of the tracer with different known amounts of tracer, a calibration curve can be created, which can be stored on a data carrier and used for later determination of the residual oil quantity from the intensity of the fluorescent radiation.
  • the sub-steps b) to d) are carried out automatically under program control, without human intervention being required to start the respective sub-step.
  • the method according to the invention can therefore be used in a continuous production process without human labor being tied for its implementation.
  • the composition of the cleaning solution is adapted to the recognized type of oil with which the goods to be cleaned are coated, according to preselected criteria. This can be done either by the control system issuing a corresponding recommendation to the operating personnel of the cleaning system for the method according to the invention.
  • the composition of the cleaning solution can also be adjusted fully automatically by the control system for the method giving appropriate dosing instructions to the dosing devices for the components of the cleaning solution.
  • the method can be used to check the result of the cleaning step, ie to determine how much Residual oil remains on the surface after cleaning.
  • the result of the determination of the residual oil load after the sub-step d) can be output either locally or at a remote location.
  • it can be stored on a data carrier for further processing - for example to identify trends or as a record in the context of quality assurance.
  • a warning signal is generated locally or at a remote location from a predetermined amount of residual oil on the surface after cleaning. This can be an optical or an acoustic signal or a display on a screen.
  • a check of the composition of the detergent solution can be initiated, which can possibly lead to components of the detergent solution being replenished automatically or that measures for the maintenance or renewal of the detergent solution are initiated.
  • the method is preferably carried out by a) adding a substance to the oil which emits fluorescent radiation when irradiated with visible light or with ultraviolet radiation, al ) cleans the surface in a later step using a cleaning solution and to determine the residual oil content on the surface after cleaning it b) the surface covered with not removed residues of oil is irradiated with visible light or with ultraviolet radiation, c) the intensity of the measures the fluorescent radiation emitted by residues of the surface of the substance added in sub-step a) at a preselected wavelength and d) determines the residual oil loading of the surface from the intensity of the fluorescent radiation of the substance added in sub-step a) and e) outputs the result of sub-step d) locally or at a remote location and / or stores it for further processing on a data carrier and / or in the event that the result of sub-step d) exceeds a preselected value or changes once or several times Repetition
  • the invention is particularly suitable for determining the amount of residual oil remaining on a surface after the surface has been cleaned with a cleaning solution. Which of the cleaning solutions known from the prior art is used for this is irrelevant for the implementation of the method according to the invention.
  • the result of sub-step d), the residual oil loading of the surface can be output not only locally, but also at a remote location.
  • the term “remote location” is understood to mean a location that is not in direct or at least in optical contact with the control system that controls the method according to the invention.
  • the remote location can represent, for example, a central process control system that is part of an overall method Surface treatment of, for example, metal parts as a subtask controls the result of the cleaning step and, if necessary, gives instructions for checking the cleaning solution.
  • the remote location can also be a central control room from which the entire process is controlled and controlled and which, for example, is in a different room than that Detergent bath, the cleaning performance of which is to be checked.
  • a remote location can also be a place outside the factory in which the cleaning step is carried out. This makes it possible for specialists to check the success of the cleaning step practice and, if necessary, measures to Initiate regeneration of the cleaning solution without being in close proximity to the cleaning solution. As a result, it is much less necessary for special personnel to be at the location of the cleaning solution.
  • control system for the method depending on the result of the determination of the residual oil content on the surface, automatically initiates a check and, as a result thereof, measures for the regeneration of the cleaning solution, without any human intervention requirement.
  • An inadequate cleaning result can be defined according to various specified criteria: You can specify a tolerance range within which the residual oil content on the cleaned surface should normally be. Furthermore, a control area can be specified in which the residual oil content may only be in a predetermined, limited number of cases, for example based on the number of determinations carried out or on the time. If the residual oil content is more frequently in the control area, the system takes one or more of the preselected measures. A trend analysis can be provided at the same time. As a result of this trend analysis, it can be provided that measures are initiated if the number of cases in which the residual oil content is in the control area increases over time. And finally, an upper limit for the residual oil content can be set, above which one or more of the planned measures are automatically initiated.
  • control system automatically initiates the determination of one or more parameters of the cleaning solution.
  • the control system can determine alkalinity, des Trigger the surfactant content and / or the oil load in the cleaning solution or several of these determinations. How these determinations can be carried out automatically is described, for example, in German Palentari reports 198 02 725. 198 14 500, 198 20 800 and 198 36 720.
  • further measures such as, for example, re-metering components of the detergent solution, their preparation or renewal can preferably be initiated and carried out automatically.
  • the entire production process is stopped from a certain threshold value for the residual oil loading and a corresponding alarm message is output locally and / or at a remote location.
  • a chemical conversion or a “coating” can mean, for example.
  • the method can therefore in particular in the Manufacture of coated steel strip, used in vehicle construction and in the household appliance industry.
  • the surface in question is the surface of a vehicle, for example a motor vehicle, or the surface of a vehicle part that is phosphated after cleaning.
  • layer-forming phosphating processes are carried out, for example the low-zinc phosphating which is usually currently carried out.
  • the method is carried out on motor vehicle bodies which are cleaned after assembly and then phosphated, it can be provided that the method according to the invention is carried out at several points on the vehicle body. For example, the residual oil loading of surface cutouts that are located on the side and on the roof of the vehicle body can be determined. It can be determined whether the cleaning solution works equally well on all parts of the vehicle body. This can be particularly important if different vehicle parts - as is quite common - are made from different materials from possibly different manufacturers, and these different materials can be coated with different oils.
  • the results of the residual oil determination are stored in such a way that the reference to the controlled vehicle or vehicle part is retained.
  • bar codes can be attached to the transport devices for the vehicles or vehicle parts, for example, which are used to identify the vehicle or vehicle part just measured. In the event of later complaints, it can then be understood how the cleaning result for the vehicle or vehicle part concerned was.
  • Such tracer substances are preferably those substances which are sufficiently soluble in the oils used and which provide a sufficiently intense fluorescent radiation in order to be able to reliably determine even small amounts of tracer substance and thus low residual oil loads.
  • the tracer substances can be selected from oil-soluble derivatives of coumarin and of benzoxazole.
  • the surface to be tested is irradiated with ultraviolet radiation with a wavelength in the range from 300 to 400 nm, the wavelength for the irradiation being able to be adapted on the basis of information from the manufacturers of the tracer substances or on the basis of preliminary examinations for the selected tracer substance. that the yield of fluorescent radiation becomes maximum.
  • the intensity of the fluorescence radiation emitted by the surface is then preferably measured at a wavelength in the range from 400 to 500 nm, which can also be adapted to the wavelength at which the fluorescence radiation has the highest intensity, after prior information or after a spectroscopic preliminary examination.
  • a coumarin derivative which is sold by the company Ciba Geigy under the trade name Tinopal R SWN is suitable as a tracer. It has an absorption maximum at a wavelength of 375 nm, so that radiation which has a high intensity in this wavelength range is preferably used as the excitation radiation for the fluorescence. Depending on the background on which the tracer is mounted, the maximum of the fluorescent radiation is in the range from 430 to 440 nm. Accordingly, this wavelength range is particularly suitable for measuring the intensity of the fluorescent radiation.
  • a benzoxazole derivative can be used as a tracer, which is sold by the company Ciba Geigy under the name Tinopal R SOP.
  • the oil is preferably mixed with an amount of a tracer substance such that the concentration of this substance in the oil is in the range from about 0.01 to about 1% by weight. At concentrations of the tracer in the oil of this order of magnitude, it is then possible, after cleaning, to determine and determine an average residual oil content on the cleaned sheet of the order of about 10 to about 100 mg / m. With these tracer concentrations it can then be provided, for example, that the tolerance range for the residual oil occupancy ranges up to approximately 20 to 30 mg 01 per m " , the control range up to approximately 50 mg / m and the alarm range begins above this value. These values are exemplary for the automotive industry where the cleaned surfaces are then phosphated. In other production processes, the limit values for the tolerance range, the control range and the alarm range can be adapted to the respective quality requirements.
  • the surface does not move relative to the Measuring element that measures the intensity of the fluorescent radiation moves; however, it can also be provided that during the implementation of sub-steps b) and c) of the method according to the invention, the surface moves relative to the measuring element, which measures the intensity of the fluorescent radiation.
  • the measuring element In the industrial production processes mentioned by way of example, it is the rule that the components or the metal strips move more or less uniformly through the individual processing zones. If you do not want any relative movement of the investigated surface section of the measuring element, it is therefore necessary that the measuring element moves at the same speed in the same direction as the section of the surface to be examined.
  • the surface moves relative to the measuring element which measures the intensity of the fluorescence radiation.
  • the measuring element is firmly mounted and the component whose surface coverage is to be checked with residual oil moves past the measuring element.
  • the measurement period which can usually be in the range of a few seconds (approximately 1 to approximately 10 seconds)
  • a larger section of the surface is thereby detected than corresponds to the actual measurement spot. This provides information about the average residual oil occupancy of the surface section that moves past the measuring element during the measuring period.
  • the measuring device used checks itself for its functionality after predetermined time intervals or after a predetermined number of measurements. It is therefore advantageous to provide that the functionality of the measuring device used for carrying out the sub-steps b) and d) after preselected time intervals or after a preselected number of measurements and / or when the results of two determinations of the residual oil loading are at least a predetermined one Distinguish value, and / or check based on a manual requirement by carrying out sub-steps b) and c) with a surface which is covered with a known amount of a substance which emits fluorescent radiation when irradiated with visible light or with ultraviolet radiation , and compares the result of sub-step d) with the known target value.
  • the self-checking of the measuring device can therefore be started automatically by the control system according to different criteria, but can also be initiated by a manual request.
  • the manual request can be made at the location of the measuring device itself or from the “remote location” mentioned.
  • the checking can be carried out, for example, by holding a material sample that is preferably available to that person Material which corresponds to the surface coating to be checked with residual oil and whose surface contains a known amount of tracer substance, so that it is known what intensity under the chosen measuring conditions the fluorescent radiation emitted by this surface should be.
  • this material sample is checked by a suitable one Position the device at the correct distance in front of the measuring element and measure the fluorescence radiation corresponding warning or alarm message is issued locally and / or at a remote location.
  • the functionality of the cleaning solution is checked by determining the residual oil occupancy of a surface after its cleaning, it is therefore necessary that the oil on the surface before cleaning is a known tracer substance in a known concentration contains. Accordingly, it is preferably provided that in those production steps which precede cleaning and where it is necessary to use an oil (e.g. for rolling, shaping, deep-drawing, for machining or for corrosion protection), an oil is used which contains a known amount of a known tracer substance.
  • an oil e.g. for rolling, shaping, deep-drawing, for machining or for corrosion protection
  • An alternative embodiment of the invention provides for the composition of a cleaning solution to be adjusted at least largely, but preferably completely, without human intervention, in such a way that it is as well suited as possible for removing a type of oil found from a surface.
  • the invention takes into account the experience that different oils can be removed from surfaces to different extents and that there is an optimal composition of the cleaning solution for each type of oil.
  • the control system for the method according to the invention can be specified which composition of the cleaning solution is to be used for which type of oil.
  • the control system can be designed to be learnable and can itself gain experience about the cleaning success of an oil type found with a different composition of the cleaning solution.
  • the control system it is necessary for the control system to combine and store the results of a residual oil measurement on the surface after cleaning with the known composition of the cleaning solution. Since the method according to the invention is preferably used in the context of an industrial production chain in which the composition of the cleaning solution is checked automatically or manually at different times, it is possible to provide the control system for the method according to the invention with information about the composition of the cleaning solution. In this way, the control system can learn, in the course of carrying out the method according to the invention, with which bath composition with the respective type of oil, after cleaning, the least residual oil occupancy is determined on the cleaned surface.
  • the method according to the invention can be carried out in the embodiment that to detect oil types on surfaces before cleaning them b) the surface covered with oil is irradiated with ultraviolet radiation, c) the intensity of the surface emitted from the surface covered with oil The oil's own fluorescence radiation measures at different wavelengths, d) the type of oil by comparing the ratios of the intensities of the fluorescence radiation measured at different wavelengths with predetermined values of these
  • the composition of the cleaning solution to be used for cleaning is automatically set to preselected values.
  • the method according to the invention therefore has the two sub-aspects that largely independently of human intervention, on the one hand, the success of a surface cleaning is checked and, on the other hand, the cleaning solution used for cleaning the surface is optimally adjusted to the type of oil found on the surface. If insufficient cleaning results are found or there is a trend that the cleaning results deteriorate increasingly, although they are still within the tolerance range, the composition of the cleaning solution can be automatically checked and, as a result of this check, the cleaning solution can be supplemented with components or bathroom care measures can be initiated for the cleaning solution . This makes it possible to ensure consistent quality in an industrial production chain largely without human control.
  • the information obtained during the period of application of the method according to the invention and the measures carried out are preferably stored on data carriers and are used for quality assurance purposes and for later evaluation as well as for collecting information (for the control system. This enables the control system to be designed so that it can be learned. By transmitting the data arising in the course of the method according to the invention to a remote location, it is possible to check the success of the cleaning step even from a remote location.
  • the method according to the invention thus increases production reliability on the one hand and reduces the manual effort for this on the other.
  • the exemplary embodiment relates to the embodiment of the invention in which the amount of residual oil on a surface is determined after cleaning.
  • the example shows how to create a calibration curve.
  • a surface of cold-rolled steel phosphated using a low-zinc phosphating process was used as the surface.
  • a corrosion protection oil Multi Draw R Pl 61 from Zeller & Gmelin GmbH & Co, Eislingen
  • the sheets coated with oil were irradiated with ultraviolet radiation with a wavelength in the range from 300 to 400 nm with a maximum at 365 nm and the intensity of the fluorescent radiation at a wavelength of 450 nm was measured.
  • the measured intensity was plotted as a relative signal strength with respect to a maximum signal strength of 100% preselected by the device setting.
  • a layer thickness of 50 nm a relative signal strength of 3% was obtained, with 250 nm a relative signal strength of 21% and with a layer thickness of 500 nm a relative signal strength of 43%.
  • a straight line can be used as a calibration curve.
  • a comparison with the calibration curve gives the average layer thickness of the remaining oil on the surface after cleaning.

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  • Life Sciences & Earth Sciences (AREA)
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  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un procédé qui permet de détecter avant nettoyage les taches d'huile sur des surfaces techniques et de déterminer après nettoyage la charge en résidus huileux sur lesdites surfaces. De préférence, le procédé est automatique, commandé par un programme. Les taches d'huile sont détectées par la fluorescence propre de l'huile, puis la composition de la solution de nettoyage est ajustée, de préférence automatiquement, de façon à pouvoir éliminer de manière optimale les taches détectées de la surface à nettoyer. Avant le nettoyage, on mélange l'huile avec un marqueur, sur la surface, afin de pouvoir contrôler les résultats dudit nettoyage. Après le nettoyage, on active par irradiation la fluorescence du marqueur et on détermine les dimensions des résidus huileux laissés sur la surface à partir de l'intensité de ladite fluorescence après étalonnage. Le procédé permet, si le résultat du nettoyage est insuffisant, d'effectuer automatiquement des mesures de contrôle afin de vérifier la composition de la solution de nettoyage et/ou de prendre des mesures pour la régénérer.
PCT/EP1999/007272 1998-10-10 1999-10-01 Detection et determination automatiques de residus huileux Ceased WO2000022421A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63317/99A AU6331799A (en) 1998-10-10 1999-10-01 Automatic detection of oil and determination of oil residues

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19846775A DE19846775A1 (de) 1998-10-10 1998-10-10 Automatische Ölerkennung und Ölrestmengenbestimmung
DE19846775.3 1998-10-10

Publications (1)

Publication Number Publication Date
WO2000022421A1 true WO2000022421A1 (fr) 2000-04-20

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PCT/EP1999/007272 Ceased WO2000022421A1 (fr) 1998-10-10 1999-10-01 Detection et determination automatiques de residus huileux

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AR (1) AR020753A1 (fr)
AU (1) AU6331799A (fr)
DE (1) DE19846775A1 (fr)
WO (1) WO2000022421A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10217950B4 (de) * 2001-04-24 2011-01-13 Volkswagen Ag Verfahren zur Bestimmung einer Beschichtungsstärke
WO2013112098A1 (fr) * 2012-01-27 2013-08-01 Spårab Produkter Ab Détection de zones contaminées
DE102016210357A1 (de) * 2016-06-10 2017-12-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Erfassung einer Belegung einer Oberfläche mittels induzierter Fluoreszenz
DE102018126837A1 (de) 2018-10-26 2020-04-30 Emg Automation Gmbh Verfahren zur automatisierten Steuerung- und Regelung einer Maschine zur Schmiermittelaufbringung sowie Einrichtung zur automatisierten Steuerung- und Regelung einer Maschine zur Schmiermittelaufbringung
DE102019100961A1 (de) * 2019-01-15 2020-07-16 Ossberger Gmbh + Co Kg Bewertungsverfahren für einen Reinigungszustand eines Werkstücks sowie eine Vorrichtung zur Durchführung des Verfahrens
CN113203719A (zh) * 2021-06-04 2021-08-03 河南柴油机重工有限责任公司 快速检测曲轴表面清洁度的方法
CN113226723A (zh) * 2018-12-31 2021-08-06 辛北尔康普机器及成套设备有限责任公司 用于监控用于输送压制材料的循环的带的润滑状态的设备和方法，以及可连续运行的压机

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DE10244819B4 (de) * 2002-09-26 2007-05-03 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zur Detektion einer fluoreszierenden Substanz auf einer technischen Oberfläche
EP1914538A1 (fr) 2006-10-20 2008-04-23 Sita Messtechnik GmbH Procédé et dispositif destinés à la saisie de la propreté ou de l'encrassement d'une surface d'une pièce
AT10543U1 (de) * 2007-12-03 2009-05-15 Austria Tech & System Tech Verfahren und vorrichtung zum ermitteln von rückständen eines materials sowie verwendung hiefür
DE102018110931C5 (de) 2018-05-07 2023-06-29 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und System zum Erfassen der Oberflächenbelegung einer Beschichtung auf einer Oberfläche eines bandförmigen Prüflings
DE102022119608B4 (de) 2022-07-19 2025-05-15 TREAMS GmbH Verfahren zur Bestimmung der Oberflächenreinheit von festen technischen Körpern mittels Wischtest

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Publication number Priority date Publication date Assignee Title
DE10217950B4 (de) * 2001-04-24 2011-01-13 Volkswagen Ag Verfahren zur Bestimmung einer Beschichtungsstärke
WO2013112098A1 (fr) * 2012-01-27 2013-08-01 Spårab Produkter Ab Détection de zones contaminées
US9435748B2 (en) 2012-01-27 2016-09-06 Spårab Produkter Ab Detection of contaminated areas
DE102016210357A1 (de) * 2016-06-10 2017-12-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Erfassung einer Belegung einer Oberfläche mittels induzierter Fluoreszenz
DE102018126837A1 (de) 2018-10-26 2020-04-30 Emg Automation Gmbh Verfahren zur automatisierten Steuerung- und Regelung einer Maschine zur Schmiermittelaufbringung sowie Einrichtung zur automatisierten Steuerung- und Regelung einer Maschine zur Schmiermittelaufbringung
WO2020083540A1 (fr) 2018-10-26 2020-04-30 Emg Automation Gmbh Procédé pour la commande et la régulation automatisées d'une machine pour l'application de lubrifiant ainsi que dispositif pour la commande et la régulation automatisées d'une machine pour l'application de lubrifiant
CN113226723A (zh) * 2018-12-31 2021-08-06 辛北尔康普机器及成套设备有限责任公司 用于监控用于输送压制材料的循环的带的润滑状态的设备和方法，以及可连续运行的压机
DE102019100961A1 (de) * 2019-01-15 2020-07-16 Ossberger Gmbh + Co Kg Bewertungsverfahren für einen Reinigungszustand eines Werkstücks sowie eine Vorrichtung zur Durchführung des Verfahrens
CN113203719A (zh) * 2021-06-04 2021-08-03 河南柴油机重工有限责任公司 快速检测曲轴表面清洁度的方法

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