WO2008040819A1 - Procédé de décontamination avec de la neige carbonique - Google Patents

Procédé de décontamination avec de la neige carbonique Download PDF

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Publication number
WO2008040819A1
WO2008040819A1 PCT/EP2007/060636 EP2007060636W WO2008040819A1 WO 2008040819 A1 WO2008040819 A1 WO 2008040819A1 EP 2007060636 W EP2007060636 W EP 2007060636W WO 2008040819 A1 WO2008040819 A1 WO 2008040819A1
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WO
WIPO (PCT)
Prior art keywords
functional layer
dry ice
contamination
contaminated
processing
Prior art date
Application number
PCT/EP2007/060636
Other languages
German (de)
English (en)
Inventor
Klaus Vissing
Uwe Bultmann
Matthias Ott
Wolfgang Hielscher
Johann Stehmeier
Original Assignee
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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
Priority claimed from DE200610047742 external-priority patent/DE102006047742A1/de
Application filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Priority to JP2009530903A priority Critical patent/JP5557208B2/ja
Publication of WO2008040819A1 publication Critical patent/WO2008040819A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/086—Descaling; Removing coating films
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/56—After-treatment

Definitions

  • the invention relates to a method for decontaminating a coated object with a functional layer by irradiating contaminated areas of the object with blasting agents which are blasted by means of a gas stream on the contamination and which consist of dry ice or dry ice.
  • the invention also relates to a contaminated object provided with a functional layer, which can be cleaned particularly well with the method according to the invention, and to a device for cleaning a contaminated object with dry ice, with which the method according to the invention can be carried out particularly effectively.
  • the invention also relates to the use of a functional coating for delaying the temperature compensation between a contamination and an object in the decontamination of the object by means of dry ice, whereby the inventive method can be carried out particularly well.
  • a particularly effective method for decontamination (cleaning) of such partially persistent contamination (soiling) is dry ice cleaning.
  • the cleaning effect is based on various mechanical and physical factors: In addition to (i) the mechanical abrasion caused by the impact of dry ice on the contamination (ii) the embrittlement of contamination by low temperatures in connection with high temperature differences from the substrate (thermoelectric ), which are triggered by the low temperature of the dry ice (about -78 ° C at atmospheric pressure) and (iii) optionally additional cooling by sublimation effects and (iv) the mechanical effect of rapid volume increase in the sublimation of the dry ice.
  • Blasting devices blasted onto the objects to be cleaned in the area of contamination.
  • the blasting material size in pellets is about 3 mm in diameter and undefined length. With additional devices, a reduction in the size of the pellets is possible.
  • the typical angle of incidence is approx. 60 ° to 90 ° to the contamination level.
  • contaminations with low cohesive forces can only be ineffectually cleaned off, since the contamination in itself becomes more brittle than at the interface between the object and contamination, and thus contamination remains more likely to adhere.
  • paints that are applied to paint on several times one above the other, layer by layer again removed can only be ineffectually cleaned off, since the contamination in itself becomes more brittle than at the interface between the object and contamination, and thus contamination remains more likely to adhere. For example, paints that are applied to paint on several times one above the other, layer by layer again removed.
  • DE 199 46 957 describes an apparatus and a method for removing a coating from a substrate.
  • the dry ice cleaning is supported by a needle device to exercise an additional mechanical impulse. Only in this way, in particular, hard or firmly adhering contaminations can be meaningfully removed with the method proposed in this document.
  • a disadvantage of this device is that restrictions with regard to the surface geometry and the object materials have to be accepted. Complex shape geometries, such. As a tire mold or even shapes with grooves or deep cuts are not achieved or edited only more or less vertical surface areas. In addition, even with the use of plastic needles to be expected that soft surfaces such. B. metallic surfaces of copper or aluminum are damaged.
  • the dry ice cleaning is combined with a laser cleaning (DE 203 08 788), an additional metered addition of conventional cleaning agent (DE 102 33 304) and the metered addition of solid blasting agents (DE 100 10 012).
  • WO 02/072312 a method for blasting of objects with blasting agents is described.
  • the blasting agent is guided by means of a gas flow to the surface of the object.
  • At least dry ice is used as blasting agent.
  • the contaminants to be removed described in this document each have a higher hardness than dry ice, but must have a lower thermal conductivity than the object to be cleaned.
  • WO 02/072312 requires that the contamination at least partially has a different thermal expansion coefficient from the object surface. This considerably restricts the choice of material for the objects to be decontaminated (to be cleaned) in combination with the respective contaminations (soiling).
  • Dry ice has a temperature of about -78 ° C and thus at the usual working environment temperature (about room temperature, ie 20 0 C) a high temperature difference ( ⁇ T) to be removed contamination.
  • the dry ice upon contact with the contamination, leads to a rapid superficial cooling, emanating from the contamination surface.
  • the (desired) consequences are thermal stresses due to the temperature difference, resulting in part in the formation of cracks in the contamination, so that the contamination of the CO 2 pellets causes contamination due to the additional mechanical effect from the object surface flakes off. Accordingly, it is advantageous if the CO 2 pellets impinge on the surface to be decontaminated at high speed.
  • the impact additionally causes the volume to be greatly increased by the sudden evaporation of CO 2 (sublimation effect) and a pressure surge occurs.
  • the pressure surge is particularly effective within cracks and is particularly effective at the interface between the object surface and the contamination, provided that the adhesion of the contamination to the surface of the object is not greater than the cohesion within the contamination. Consequently, the materials with a low cohesion such.
  • WO 02/072312 shows that the following factors play a role in the effectiveness of CO 2 steel cleaning:
  • the thermal conductivity of the contamination must be low compared to the surface to be cleaned.
  • the object to be cleaned must have a high heat capacity.
  • the thermal load capacity of the contamination should be low, so that build up thermal stresses.
  • the contamination should not adhere more strongly to the surface to be cleaned than the cohesive forces within the contamination.
  • the object of the present invention was therefore to specify a method for the decontamination of objects in which a part or all of the described disadvantages known from the prior art are reduced or avoided.
  • the aim was to create the possibility of reducing the noise level when cleaning object surfaces with dry ice.
  • the possibility should be created to reduce the mechanical stress on the surfaces.
  • Another goal was to increase the range of possible combinations of materials from the object to be cleaned (or its surface) and the contamination.
  • this object is achieved by a method for decontamination, comprising the steps:
  • the functional layer has a lower thermal conductivity than the object (in particular in the region of the object surface) and
  • the functional layer in the range from -78 ° C to room temperature is resistant to the temperature differences that occur when contacting with dry ice.
  • the object may be a component for a painting device if the functional layer is a plasma-polymer layer comprising oxygen, carbon and silicon, but under certain circumstances it is expedient that only other combinations of object and functional layer are selected than those mentioned.
  • the functional layer may be used according to the invention not to fulfill one, several or all of the following features, provided that the functional layer is a plasma-polymer layer:
  • the molar ratio O: Si is> 1, 1 and ⁇ 2.6
  • the plasma polymer layer is a gradient layer which can be produced by temporal variations of the polymerization conditions.
  • the plasma polymer coating comprises hydrogen and / or fluorine, where: 1, 8: 1> n (H and / or F): n (C) ⁇ 3.6: 1.
  • plasma polymer layers which do not fulfill one, several or all of the aforementioned properties are characterized by one, several or all of the following features:
  • the molar ratio O: Si is> 0.75 to 1.1
  • the molar ratio C: Si is 2.2 to ⁇ 2.5
  • the plasma-polymer functional layer consists of carbon, silicon, oxygen and hydrogen and possibly conventional impurities, wherein in the ESCA spectrum of the plasma polymer product, when calibrated on the aliphatic portion of the C 1 peaks at
  • the Si 2p peak has a bond energy, which is shifted by a maximum of 0.44 eV to higher or lower binding energies, and the O 1 s peak has a binding energy value shifted by a maximum of 0.50 eV to higher or lower binding energies.
  • Preferred methods according to the invention are carried out with a contaminated object provided with a functional layer, in which one or more of the parameters "type of object”, “type of contamination” and “composition of the functional layer” are the configuration described below as being preferred and / or further characterized have.
  • Contaminations may generally include organic and / or inorganic (both metallic and non-metallic) to be stripped materials including natural products, printing inks, adhesives, rubber, rubbers, plastics, paints, food, (partially) inorganic curable compositions z.
  • B. as a base material for the production of building materials such.
  • B. polymer concrete, chemicals such.
  • metallic layers such as galvanizing, basic materials for the production of chemical, biotechnological or pharmaceutical products, adhesion of biological material such as algae. They may also represent residues or precursors of the substances mentioned.
  • the functional layer should fulfill the following properties:
  • the functional layer should have a sufficiently high internal strength / surface hardness, so that it is not damaged by the impact of dry ice and the subsequent sublimation of the dry ice.
  • the functional layer should, starting from normal working conditions, ie in particular room temperature (20 0 C) be resistant to the temperature differences that occur when contacting with dry ice. This means that they tolerate temperature differences from about 20 0 C to at least -78 ° C, without a relevant Kälteversprödung occurs. It is preferred that the functional layer withstands temperature differences of 120 K, more preferably of 140 K, more preferably of 220 K, particularly preferably of 350 K and most preferably of 428 K, without cold embrittlement occurring.
  • the functional layer is resistant to cold embrittlement in the range of 250 0 C, more preferably 350 0 C to -78 ° C, very particularly preferably tolerated in the range below 350 ° C and lower temperatures of -85 ° C or lower.
  • the functional layer should have a lower thermal conductivity than the object / object surface in order to support the cleaning effect caused by the dry ice: Thus, the functional layer can actually have an insulating effect and prevent temperature compensation between the object and the contamination from taking place too quickly.
  • the functional layer has a lower thermal conductivity than the contamination. This also supports the cleaning effect caused by the dry ice: the fact that the temperature equalization between contamination and
  • Function layer occurs delayed, occur more thermoelectric voltages, which lead in particular at the interface between contamination and functional layer to release effects.
  • the functional coating also provides insulation from the surface of the object, which also makes it possible to use objects with less
  • an essential part of the invention is also the use of the functional coating, in particular in the further preferred embodiments for delaying the temperature compensation between a contamination (also preferred as further specified in this text) and an object (also preferred as further in this
  • Each of the proposed properties of the functional layer can contribute to making the method according to the invention feasible. However, not all properties need to be met to enable this procedure. The more of the proposed properties the more used Functional layer has, however, the simpler will be carried out as a rule, the inventive method.
  • the proposed properties allow the functional layer to improve the thermal effect of dry ice cleaning. At the same time it reduces the adhesion of the contamination, so that the dry ice can be radiated with less pressure during decontamination. This reduces the mechanical stress on the surface and, in particular, the noise level that occurs during dry ice cleaning. At the same time, lower surface temperatures of up to -78 ° C or less can be achieved faster.
  • the functional layer also reduces the risk that the object to be cleaned itself will be damaged and increases the choice of material with respect to the object to be cleaned. It is crucial that the functional layer shows no embrittlement or thermal stress at the above-described temperatures and temperature differences.
  • a carrier gas stream for the dry ice at a rate of 150 m / s or less, preferably 120 m / s or less, in the process according to the invention. It is also preferred that the dry ice is largely anhydrous, so that the risk of damage caused by water ice is reduced, and / or that the dry ice is used in the form of snow and / or pellets.
  • a device for cleaning contaminated objects with dry ice has proven to be particularly effective, which comprises a blasting device, which in turn
  • each train has an opening at the jet outlet, the one by 30 ° - 50 ° relative to the longitudinal axis of
  • Blasting device causes angled outlet of the blasting material and / or
  • b) comprises a device which ensures that the dry ice before passing out of the blasting device passes through an opening of 0.3 mm or less in diameter.
  • the device mentioned under b) may be a sieve or the like. This device is intended to ensure the desired pellet size and can for example also represent a passage device in the form of a perforated plate. It hinders the passage of larger pellets and at the same time brings them to the required level.
  • An alternative to a size limiting device may be the use of snow jet systems rather than pellet jet systems.
  • the advantage of the described device for cleaning contaminated objects with dry ice is, in particular, that the same cleaning effect is achieved by the generated rotational movement with simultaneous Aufnreffwinkeleloptimierung, as with standard jet devices with higher gas flow. Due to rotation and impact angle, cutting shadows are reduced due to movement restrictions during decontamination of mounted objects such as B. forms almost impossible.
  • the device contributes, in particular in combination with the functional coating, to the fact that the sound pressure during cleaning can be reduced to 100 dB (A) or less and the functional layer is also subjected to less mechanical stress due to the reduction of the carrier gas flow pressure, since the impact force of the dry ice jet essentially depends from jet pressure and slightly dependent on particle size. It should also be noted that the impact force of the dry ice jet is not dependent on the mass flow and within reasonable limits also not dependent on the working distance.
  • FIG. 1 schematically depicts the decisive part of a device according to the invention for carrying out a method according to the invention.
  • the subfigures are:
  • FIG. 1a a cross section through the emitting device
  • Figure 1 b a schematic representation to illustrate the radiation angle
  • Figure 1c the spray pattern of the device according to the invention.
  • Figure 1d the jet pattern of a conventional device for cleaning with dry ice.
  • FIGS. 1a to 1b Schematic representation of the courses of the trains in the radiating device (dashed lines)
  • the mode of operation of the part of the device according to the invention for cleaning contaminated objects with dry ice shown in FIGS. 1a to 1b is as follows:
  • the pellets are introduced under the influence of the carrier gas stream in the emitting device.
  • the carrier gas stream usually used pellets have a roll shape with a diameter of 3mm and an undefined length.
  • train division 3 of the material flow is divided into three separate trains.
  • the trains are not yet completely separated, as can be seen from the cross-sectional representation 8. This allows an improved material flow.
  • the complete separation of the trains is shown in the schematic cross-sectional representation by the reference numeral 9.
  • Strahlstrahlfuß 4 exits the blasting (the crushed pellets).
  • the position of the trains is represented by the cross-sectional representation 10. The exit takes place at a radiation angle of 40 ° - 60 °, which leads to an angle with respect to the longitudinal axis of the jet device angled exit of 30 ° - 50 °.
  • the device generates a spray pattern with a centrifugal effect 6, that, unlike the jet pattern 7 known from the prior art, also has a lateral movement of the blasting means, so that they can achieve better complicated surface structures, such as undercuts. Since the method according to the invention is particularly well suited for a contaminated object, wherein the object is provided on the object surface at least partially with a functional layer on which a contamination adheres, and wherein the contamination on the functional layer adheres less firmly than it would on the surface of the object underlying the functional surface,
  • the functional layer has a lower thermal conductivity than the object
  • Such an object is also part of the invention.
  • such an object is not a component for paint processing equipment.
  • the functional layer based on organofluorine and / or organosilicon materials is preferred.
  • a plasma polymer coating is used as a functional layer.
  • a plasma polymer coating is a coating produced by the use of vapor deposition by means of a plasma source.
  • a precursor is used, which is fragmented in the gas phase in such a way that due to this fragmentation, a polymerization of the substance to be deposited in the gas phase and / or on the surface is deposited on (plasma polymerization).
  • a gaseous substance containing at least carbon, silicon and / or sulfur atoms is excited and fragmented in a plasma.
  • the excitations and fragmentation of the molecules of this substance, in particular a plasma-polymerizable precursor (often called a monomer) in the gaseous or vapor state, is carried out by
  • the height structure, the relief and the topography of the surface to be coated remain largely intact during the plasma polymerization. This is often described as a replica of the surface structure.
  • Plasma polymer layers depend on the monomer used and the conditions of preparation. Plasma polymer layers differ significantly from polymers, for example, in terms of their structure by typical properties of plasma polymers:
  • the structure of plasma polymers has little in common with the structure of the precursors used due to fragmentation during plasma stimulation.
  • Plasma polymers are highly cross-linked, but may still have double bonds. As a rule, plasma polymer layers have long-lasting free radicals after production and are saturated with atmospheric oxygen and / or moisture only over time.
  • Plasma polymer layers do not exhibit tacticity (i.e., there is no regularity with which configurative repeating units follow one another) since they do not result from coordinated chain reactions.
  • Plasma polymer layers are amorphous.
  • the functional layer of a plasma polymer gradient layer which can be produced by temporal variation of the polymerization conditions is preferred.
  • polymerization conditions is meant in particular the parameters relevant for deposition in the plasma polymerization.
  • gradient layers are z.
  • the molar ratio O: Si is particularly preferably> 0.75 and ⁇ 2.6
  • the molar ratio C: Si is> 0.6 and ⁇ 2.5 (such layers are particularly in WO 03 / 002269 and DE 101 31 156 A1, there in particular in the claims)
  • the plasma polymer functional layer consists of carbon, silicon, oxygen and hydrogen and optionally conventional impurities, wherein in the ESCA spectrum of the plasma polymer product, when calibrated to the aliphatic portion of the C 1 s peaks at 285.00 eV, in comparison with a trimethylsiloxy-terminated polydimethylsiloxane (PDMS) having a kinematic viscosity of 350 mm 2 / s at 25 ° C.
  • PDMS trimethylsiloxy-terminated polydimethylsiloxane
  • the Si 2p peak has a binding energy value of not more than 0, 44 eV is shifted to higher or lower binding energies
  • the O 1s peak has a binding energy value of no more than 0.50 eV is shifted to higher or lower binding energies (such layers are described in particular in the application with the German file number 10 2006 018 476.9, there in particular in the claims).
  • the plasma-polymer coating comprises hydrogen and / or fluorine, where
  • a ratio of 1, 5 ⁇ n (C): n (O) ⁇ 2.5 for the functional layer is most preferably, a ratio of 1, 5 ⁇ n (C): n (O) ⁇ 2.5 for the functional layer.
  • the functional layer is firmly bound to the surface of the object by means of adhesion promoters or primers, it also being possible for the adhesion promoter to consist of a plasma-polymer coating.
  • the functional layer has a thermal conductivity in the range of 0.5 or 0.1 to 1 W / mK.
  • thicknesses in the range of 0.01 to 1 ⁇ m are preferred.
  • plasma polymer coatings which are silicon and / or fluoroorganic nature whose thermal conductivity is in the range of 0.05 to 1 W / mK.
  • the plasma polymer coatings are particularly suitable because they are contour contoured, can be made very thin, so that objects that are shapes do not have to be made to undersize and can be performed with excellent adhesion to the object surface.
  • Plasma polymer layers have a high hardness and internal strength because they are closely meshed in all spatial directions.
  • Plasma-polymer coatings based on organosilicon and / or fluoroorganic base can be very well established as a gradient layer, so that they can form a low-energy, anti-adhesive surface in addition to a good adhesion to the object surface.
  • the layer can be optimally adjusted to the method according to the invention, ie in particular also to the object surface to be cleaned and the type of contamination. An optimization in this area is easily possible for the expert with a few attempts.
  • the plasma polymer layers described, in particular those described as preferred, maximize the temperature gradient in a particularly good manner and thus also the thermal effect of the dry ice cleaning.
  • the liability of contamination is reduced.
  • This makes it particularly well possible in the manner described to reduce the working pressure and thus the flow velocity of the carrier gas stream for the dry ice. Since the surface temperature decreases with decreasing jet pressure, the thermal effect can be increased even further.
  • the reduction of the working pressure or the impact force of the dry ice particles also makes it possible to process mechanically sensitive materials. In particular, the noise pollution also decreases. In principle, it is possible to work with all sizes of dry ice, especially pellets with a maximum diameter of 0.3 mm have been found to be effective.
  • the method according to the invention can be used particularly preferably for objects which have to be cleaned regularly. It is also suitable for removing coatings (which are on the functional layer) and for cleaning normally stuck contaminants.
  • the fields of application are, in particular, adhesive processing, plastics processing and rubber processing, in particular Tire manufacturing, paint processing, food processing, the
  • molding tools including embossing tools
  • presses or parts thereof devices for dosing and applying adhesives or parts thereof, vulcanization molds or parts thereof, solder gauges, pressure rollers, or housings or other parts of printing machines, components of painting equipment such ,
  • grids tentering (fabric finishing), cutting devices (raw rubber or other materials adhering by pressing), grills, industrial forms (waffle irons), prisms of underfloor lights (airfield lighting), devices for mixing, transfer, conveying, transporting application, measuring, dosing, heating , Cooling, drying, separating, crushing, storing, curing and / or purifying chemical substances, pharmaceutical raw materials, paints, varnishes, polymers, foods and / or other natural substances, for example filters, sieves, heat exchangers, knives, chemical, biochemical or biotechnological reactors , Components of extrusion tools, as well as components from the periphery of the cited devices and equipment, which
  • Part of the invention is also a contaminated object provided with a functional layer, wherein the object in the region of the functional layer has a thermal conductivity of 20 W / mK or more and / or the functional layer has a thermal conductivity of 10 W / mK or less.
  • the method according to the invention is economically relevant for the following areas: Tire production and rubber processing: In the vulcanization (up to about 180 0 C) of the tires (synthesis and natural rubber) in a geometrically pronounced form remain in the long term rubber residues and remnants of a processing aid, with which the blank is sprayed (blank pretreatment), in the form that slowly build up. Here, the mold must be cleaned in regular cycles. The same applies to other areas of rubber processing.
  • Plastics processing In the production and processing (eg molding and use of adhesives such as polyester adhesive) with a
  • Hot stamping tool (typically in the range of 200 to 240 0 C) perform the temperatures used in hot stamping a vercracken of the adhesive. This then builds up slowly in the form. Corresponding effects also occur in the processing of soft-elastic foam plastics (eg PU or melanin foam, cellular elastomers) and technical nonwovens, so that decontamination also has to be carried out regularly here.
  • soft-elastic foam plastics eg PU or melanin foam, cellular elastomers
  • plastics such as polyurethane, epoxies or hot-melts release agents are used, which build up slowly in the form. These contaminations must also be removed at regular cleaning intervals.
  • Adhesive processing For the processing and dosing of adhesives (1 K, 2 K, with and without solvents), hot and cold glues, photoresists, varnishes, solder resists, linoleum, oils, resins with z.
  • the contamination may also be precursors or constituents of the end products or the residues of precursors or constituents.
  • valves of the mold are affected by the pollution, thereby losing their functionality in the long run.
  • the vulcanization mold was provided with the valves with a plasma polymer functional layer, which was prepared as follows:
  • This conformal coating which has a thermal conductivity lower than 1 W / mK, enables the mold to be rapidly and effectively cleaned with dry ice when a carrier gas stream for the dry ice is used at a maximum speed of 150 m / s.
  • the noise pollution during cleaning was significantly reduced.
  • the dry ice consumption could be reduced by about 50%.
  • the usual cleaning intervals could be extended to 8 to 10 times by the specified functional layer. The valves almost no longer clogged and are therefore easy to clean and replace less frequently. In addition, they were mechanically less burdened.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning In General (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Nozzles (AREA)

Abstract

L'invention concerne un procédé pour le nettoyage d'un objet contaminé avec de la neige carbonique, l'objet étant muni au moins partiellement d'une couche de fonction à sa surface, une contamination adhérant sur cette couche. Selon ce procédé, (a) la contamination adhère moins fort sur la couche de fonction qu'elle ne le ferait sur la surface de l'objet se trouvant en dessous de la couche de fonction, (b) la couche de fonction présente de préférence une thermoconductivité moins importante que l'objet et (c) la couche de fonction résiste aux différences de température apparaissant à température ambiante lors du contact avec la neige carbonique.
PCT/EP2007/060636 2006-10-06 2007-10-08 Procédé de décontamination avec de la neige carbonique WO2008040819A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009530903A JP5557208B2 (ja) 2006-10-06 2007-10-08 汚染した物体、汚染した物体をドライアイスで洗浄するための装置、汚染物を除去するための方法、及び機能皮膜の使用

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006047742.1 2006-10-06
DE200610047742 DE102006047742A1 (de) 2006-04-07 2006-10-06 Verfahren zur Dekontamination mit Trockeneis

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WO2008040819A1 true WO2008040819A1 (fr) 2008-04-10

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WO2011088884A1 (fr) 2010-01-25 2011-07-28 Oerlikon Trading Ag; Trübbach Procédé de nettoyage pour des installations de revêtement
CN111672833A (zh) * 2020-06-11 2020-09-18 格力电器（武汉）有限公司 聚氨酯发泡溢料清除系统

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DE102013219585A1 (de) * 2013-09-27 2015-04-16 Carl Zeiss Smt Gmbh Optische Anordnung, insbesondere Plasma-Lichtquelle oder EUV-Lithographieanlage

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