EP4168213A1 - Procédé pour refroidir et/ou séparer des éléments collés et/ou retirer des résidus de colle se trouvant sur des surfaces et dispositif à jet correspondant - Google Patents

Procédé pour refroidir et/ou séparer des éléments collés et/ou retirer des résidus de colle se trouvant sur des surfaces et dispositif à jet correspondant

Info

Publication number
EP4168213A1
EP4168213A1 EP21745893.4A EP21745893A EP4168213A1 EP 4168213 A1 EP4168213 A1 EP 4168213A1 EP 21745893 A EP21745893 A EP 21745893A EP 4168213 A1 EP4168213 A1 EP 4168213A1
Authority
EP
European Patent Office
Prior art keywords
cooling head
blasting device
adhesive
carbon dioxide
coolant
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.)
Pending
Application number
EP21745893.4A
Other languages
German (de)
English (en)
Inventor
Michael Wibbeke
Gerson Meschut
Marc Wünsche
Jan Ditter
Jens-Werner Kipp
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.)
Mycon GmbH
Original Assignee
Mycon GmbH
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 DE102020003736.4A external-priority patent/DE102020003736A1/de
Priority claimed from DE102021110364.9A external-priority patent/DE102021110364A1/de
Application filed by Mycon GmbH filed Critical Mycon GmbH
Publication of EP4168213A1 publication Critical patent/EP4168213A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0021—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by liquid gases or supercritical fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/063—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet one fluid being sucked by the other
    • B05B7/064—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet one fluid being sucked by the other the liquid being sucked by the gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
    • B08B7/0092—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/04—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by a combination of operations
    • 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
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/50—Solvents
    • C11D7/5004—Organic solvents
    • C11D7/5022—Organic solvents containing oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1418—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet for supplying several liquids or other fluent materials in selected proportions to a single spray outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2489—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device
    • B05B7/2491—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device characterised by the means for producing or supplying the atomising fluid, e.g. air hoses, air pumps, gas containers, compressors, fans, ventilators, their drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2489—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device
    • B05B7/2494—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device a liquid being supplied from a pressurized or compressible container to the discharge device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2220/00—Type of materials or objects being removed
    • B08B2220/01—Adhesive materials

Definitions

  • the invention relates to a method for removing adhesive residues from surfaces and a blasting device therefor.
  • Adhesive joints are materially bonded joints between joining partners that are used more and more frequently, and have to be separated again in the motor vehicle sector, for example during maintenance work or in the course of body repairs, but also when necessary. Existing connections and joints have to be opened or removed economically and efficiently. Above all, the removal of structural adhesive joints is a major challenge.
  • a common procedure today for separating adhesive bonds is local heating of the bonded areas using various methods (hot air blower, infrared heater, etc.) in order to loosen the adhesive layer.
  • the heating is often undefined and there is a risk of thermal damage to adjacent, remaining structures, components and surfaces. This can make re-gluing more difficult.
  • the adhesive can be softened and thus loosened more easily, but adjacent, for example painted body areas that remain on the vehicle can also be heated impermissibly and thereby their color or strength change or even be irreparably damaged by the formation of bubbles.
  • thermo-thermal methods for loosening the sticking of parts or for cleaning contaminated surfaces on the parts, for leg play using induction heating or a hot air blower. Work must be carried out in high temperature ranges of up to 400 ° C, so that the functionality of the connected parts or deeper layers can be impaired.
  • cleaning methods and blasting devices which work with the aid of carbon dioxide and optionally additionally used compressed air.
  • the carbon dioxide is supplied either in solid form as pellets or as liquid carbon dioxide. It then expands into the atmosphere in an expansion chamber of the blasting device or when it emerges from a nozzle of the blasting device, so that small carbon dioxide particles and gaseous carbon dioxide are formed.
  • a blasting device and a cleaning method are described in DE 102008 061 667 A1.
  • the object of the invention is to remove adhesive residues from a surface by means of an improved cleaning method or a further developed blasting device.
  • the invention has the features of claims 1 and 9.
  • the further subclaims and the following description show advantageous developments of the invention.
  • the invention has recognized that effective cleaning can be achieved by increasing the energy transfer and further cooling of the surface to be cleaned if a cold-resistant liquid is added to the cleaning jet.
  • the cold-resistant liquid is added before, during or after the conversion of the liquid carbon dioxide into gaseous carbon dioxide and carbon dioxide particles.
  • the coolant formed by admixing the cold-resistant liquid with the carbon dioxide has a significantly higher energy content and temperatures lower than -40.degree. C. and preferably about -70.degree. C. can be achieved.
  • the cleaning effect improves at such low temperatures.
  • adhesives used in the automotive industry in the body shop become brittle at these temperatures.
  • adhesive residues can be removed quickly and reliably.
  • adhesives become brittle at these temperatures.
  • the bonds can be dismantled and preferably separated mechanically. The contamination can then be removed quickly and reliably from the surfaces.
  • ethanol or isopropanol is added to the carbon dioxide mixture, or a mixture with ethanol or isopropanol is used as the main component.
  • the temperature of solid carbon dioxide is -78.5 ° C.
  • a cold-stable liquid By adding a cold-stable liquid and slightly warming it up in the area of the nozzle and in the atmosphere before it hits the surface of the bonded parts to be separated or the contaminated surface, the temperature of the emerging mixture is reduced.
  • temperatures as low as -70 ° C can be reached here. This temperature is particularly dependent on the amount of carbon dioxide supplied in relation to the amount of the cold-stable liquid supplied.
  • the housing is open to the surface of the part to be separated or cleaned, but also has an opening to which a line for discharging carbon dioxide and cold-stable liquid is connected.
  • the intrinsic pressure of the gas then either automatically leads to sufficient discharge or this discharge can be supported by gentle suction.
  • liquid carbon dioxide instead of liquid carbon dioxide, all liquid gases can be used which, when expanded to a gaseous state, reach a temperature below -40 ° C.
  • liquid nitrogen can be used. Ethanol, isopropanol or another cold-resistant liquid can then also be added to the nitrogen. Significantly lower temperatures can then be achieved here again.
  • the nitrogen is more complex to handle and has far higher requirements in terms of safety. It could be used in stationary applications, for example in the car factory, for example to repair a failed production or to remove excess glue.
  • the cold-resistant liquid is supplied in the jet device preferably during or after the expansion of the liquid gas, preferably carbon dioxide.
  • the cold-resistant liquid is therefore not added to the liquid carbon dioxide, but rather to the mixture of gaseous carbon dioxide and carbon dioxide particles that is formed or formed.
  • the dosing of the liquid carbon dioxide and the cold-resistant liquid takes place on the blasting device by separate dosing units. This makes it possible to flexibly adapt the mixing ratio and the volume flow to different cleaning tasks.
  • the shape and size of the expansion chamber and the setting of the metering unit for the liquid carbon dioxide are preferably selected so that the liquid carbon dioxide is about 40 to 60% converted into gas and about 60% accordingly up to 40% carbon dioxide particles are produced. Particularly effective cleaning and cooling has been demonstrated here and the cleaning process can advantageously be carried out quickly.
  • This process can also be used as an effective energy transfer system, for example for cooling systems using two different media.
  • the addition of the cold-stable liquid before, during or directly after the expansion of the liquid carbon dioxide leads to a higher energy density in the expansion space. This accelerates the transfer of energy. This leads to a stronger cooling of the environment. Due to the higher heat transfer coefficient of the cold-stable liquid, more energy is withdrawn from the adjacent surfaces faster and more quickly.
  • the invention is based on a device for the gentle separation of adhesive bonds, which brings a coolant into the area of adhesive bonds to be separated between bonded joint partners, whereby the adhesive of the adhesive bond assumes a temperature that enables the adhesive bond to be separated with low mechanical forces.
  • the device is further developed in accordance with the invention in that a cooling head covers at least a section of the adhesive connection to be separated, the coolant being able to be introduced between the cooling head and the section of the adhesive connection covered by the cooling head.
  • the cooling head can be adapted and dimensioned to the respective present shape of the sections of the adhesive connection covered by the cooling head and each covers at least the area of the adhesive connection that is to be separated from one another.
  • the coolant volume to be introduced is largely reduced to the volume of the cooling head and the cooling head can also largely seal off the coolant to be introduced against undesired leakage and thus loss of coolant.
  • the cooling head can seal off neighboring areas of the components that are not to be cooled down from undesired exposure to cold.
  • the cooling head can be positioned manually on the adhesive joint and consumes - unlike the known coolant baths for immersing the components - significantly less coolant. In addition, handling is much easier and safer.
  • the basic shape of the cooling head is adapted, preferably by means of additive manufacturing processes, to the respective shape and / or geometry of the bonded joint partners in the area of the respective adhesive connection to be separated.
  • This makes it easy and inexpensive to adapt the basic shape of the cooling head to a wide variety of shapes and, if necessary, partial geometries as well as the dimensions of the adhesive joints of the bonded joint partners to be separated, especially when using additive manufacturing processes, so that the advantages of the limited coolant volume required and the ease of use of the cooling head can be guaranteed even with complex geometrical relationships of the adhesive joint to be separated.
  • the cooling head has a hood-shaped, preferably bellows-like basic shape, since such a hood-shaped configuration of the cooling head offers good manageability of the cooling head with a defined volume for the coolant inside the cooling head.
  • the hood-shaped cooling head is then designed to match the respective shape of the bonded joint partners in the area of the adhesive connection to be separated and can be pressed against the area of the adhesive connection to be cooled so that the cooling head overlaps the area of the adhesive connection to be cooled and in relation to the environment largely concludes.
  • the introduced coolant is thereby largely enclosed and can develop its cooling effect locally without the coolant being able to escape impermissibly.
  • Hood-like encompassing should mean here any form of delimitation of a largely closed volume between the cooling head and bonded joint partners, which naturally depends on the shape of the bonded joint partners to be separated and the necessary coolant volume and, within the scope of this invention, largely depends on the respective conditions by the person skilled in the art can be customized.
  • the cooling head can have a material that can be elastically deformed at normal ambient temperature to the shape of the bonded joint contour in the area of the respective covered adhesive connection, the material of the cooling head maintaining its respective shape when the adhesive connection cools, preferably solidified inelastic.
  • the material of the cooling head can also be designed at least in sections so that the cooling head is wholly or partially elastically deformable and thus also adapts to the shape of the can adapt each area to be cooled of the adhesive bond. This elastic deformability is advantageous when building up the cooling effect, since it achieves an improved sealing of the coolant volume in the cooling head.
  • the handling of the cooling head is simplified if the elastically deformable parts of the cooling head lose at least part of their elasticity and largely because of the coldness of the coolant inside the cooling head, by which the elastically deformable parts are also acted upon solidify and thereby retain the shape achieved. In this way, for example, the contact pressure on the cooling head required for sealing can be reduced.
  • a further improvement in the loss of coolant can be achieved by the fact that the cooling head has sealing elements or the like, preferably sealing lips, on its joint area resting against the bonded joint partners.
  • This enables elasticity, which can optionally be adjusted independently of the existing elastic properties of the cooling head itself, at the contact areas between the cooling head and the respective covered areas of the adhesive connection, whereby the sealing effect can be additionally improved.
  • Any remaining joints between the contact areas of the cooling head and the bonded joint partners are also sealed by the action of the coolant that may escape there, in that areas that are frozen with the ambient air are formed there, which additionally close the joints.
  • liquid carbon dioxide which turns into a gaseous state in the area of the cooling head, dry ice forms on the adhesive bond to be separated by resublimation, which also seals the remaining joints.
  • the cooling head can partially cool the adhesive connection to be separated by successive displacement relative to the bonded joint partners and the adhesive connection can be partially separated one after the other. In this way, even larger adhesive connection areas can easily be processed one after the other without large ones Coolant quantities are required for this.
  • the cooling head is moved, for example by hand, successively or step-by-step over the adhesive surfaces to be separated and cooled in each case, after which the respective cooled area is mechanically separated.
  • the cooling head preferably insulated from other areas of the cooling head in terms of cooling technology
  • a worker can, for example, position the cooling head manually to match the adhesive connection to be separated and cool it locally and then separate it, after which the worker positions the cooling head at the next point of the adhesive connection to be separated and can thus successively process larger adhesive connections to be separated.
  • Such handling elements also facilitate the pressing and sealing of the cooling head, if necessary until the material of the cooling head solidifies. It is of course also conceivable to position the cooling head automatically or in a guided manner.
  • the cooling head has a separating device with which the bonded joining partners can be separated by applying a mechanical force, preferably a force introduced in the form of a pulse, in the area of the cooled adhesive surface.
  • a separating device arranged on the cooling head can, for example, bring about an at least local separation of the bonded joint partners through mechanical impacts and / or vibration on the bonded joint partners and thereby accelerate the separation of the bonded joint partners.
  • the device has means for introducing a gaseous coolant or coolant that changes into the gaseous state between the cooling head and the section of the adhesive connection covered by the cooling head.
  • corresponding valves and supply lines can be arranged on the cooling head, which for example connect the cooling head to a coolant supply, through which the coolant can enter the interior of the cooling head from the coolant supply.
  • these connections in such a way that the cooling head is connected to the coolant supply in a fluid-tight manner in such a way that the coolant can circulate between the cooling head and the coolant supply. This is also a recovery of the coolant is possible after the respective cooling cycle per area of the adhesive bond to be separated has ended.
  • a monitoring device for the temperatures reached in the cooling head and / or on the bonded joining partners is provided in the area of the cooling head.
  • the volume inside the cooling head can be monitored by a temperature sensor or the surface temperature of the bonded joint partners to be cooled within the cooling head can be measured.
  • the material of the cooling head can at least in sections comprise, for example, elastomeric plastic materials with a glass transition range between -50 ° C and -78 ° C, preferably silicone rubber and / or styrene-butadiene rubber and / or polybutadiene.
  • elastomeric plastic materials with a glass transition range between -50 ° C and -78 ° C, preferably silicone rubber and / or styrene-butadiene rubber and / or polybutadiene.
  • Such materials are, on the one hand, readily elastically deformable at room temperature and can easily be brought into the required shape of the cooling head; on the other hand, they have rather brittle properties below their respective glass transition temperature.
  • the glass transition temperature of such materials is advantageously in the range of the temperatures that the coolant generates within the cooling head, so that the coolant can cause not only the embrittlement of the adhesive connection but also the solidification of such materials of the cooling head.
  • the material of the cooling head has, at least in sections, metallic materials that are shaped in the form of bellows or similar to corrugated pipes or flexible hoses. Such metallic materials do not solidify as strongly as plastic materials at normal coolant temperatures, but are sufficiently flexible and mechanically wear less than plastic materials.
  • cooling head as part of the device according to the invention is optional and depends on the application.
  • the use of a cooling head in series lends itself to recurring removal or cleaning processes, whereas the use of a cooling head that is in any case individually adapted to the geometry of the components is less advantageous for small quantities.
  • the blasting device can be used flexibly without a cooling head.
  • the blasting device provides a collecting head for the coolant from the carbon dioxide and the cold-resistant liquid, with which the supplied coolant is collected or absorbed.
  • the blasting device can be used, for example, if the cooling head is dispensed with.
  • the method according to the invention for separating adhesive connections and / or removing adhesive residues from surfaces in a way that is gentle on components provides, for example, that the coolant is brought into the area of the surfaces of the adhesive connections to be separated between glued joining partners, whereby the adhesive of the adhesive connection assumes a temperature that allows separation allows the adhesive bond with lower mechanical forces.
  • a cooling head is advantageously adapted to the geometry of the bonded joint partners in the area of the respective adhesive connection to be separated.
  • the cooling head covers at least a section of the adhesive connection to be separated, the coolant being introduced between the cooling head and the section of the adhesive connection covered by the cooling head.
  • FIG. 1 shows a partial sectional view of a blasting device according to the invention
  • FIG. 3 shows a schematic, isometric illustration of a cooling head as an optional part of the device according to the invention with an elastic, bellows-like basic structure and connections for the supply of a coolant into the interior of the cooling head,
  • FIG. 4 shows the cooling head according to FIG. 3 in three plan views
  • FIG. 5 shows a first application of the cooling head according to FIG. 3 on a plane
  • FIG. 6 shows a further application of the cooling head according to FIG. 3 with blow-out openings arranged on the bellows-like lamellae and a curved contact surface on the bonded joint partners and
  • FIG. 7 applications of a straight cooling head according to FIG. 3 on a flat adhesive surface (FIG. 7), an inclined cooling head on an inclined adhesive surface (FIG. 8) and a rounded cooling head on a rounded adhesive surface (FIG. 9 ).
  • Fig. 1 shows a partial sectional view of a blasting device according to the invention.
  • the blasting device according to the invention comprises, as essential components, a tubular base body 1, a housing body 5, which the base body 1 it engages around the jacket side in sections and provides an outlet opening 18, a feed unit 9 for the liquid carbon dioxide and a first metering unit 4, via which the feed unit 9 is connected to the base body 1.
  • a second metering unit 12 for the cold-resistant liquid and a line section 11 assigned to the second metering unit 12 for the cold-resistant liquid are also provided.
  • the first metering unit 4 and the base body 1 of the blasting device together provide an expansion chamber 2 which is formed in sections by a first line section 3 which has a cylindrical, convergent and / or divergent cross section.
  • the liquid carbon dioxide expands and gaseous carbon dioxide and carbon dioxide particles are formed.
  • the carbon dioxide mixture reaches the housing body 5 of the blasting device through the first line section 3 and leaves it through the outlet opening 18 formed on the housing body 5.
  • the second line section 11 serving to supply the cold-resistant liquid opens into the divergent part of the first line section 3.
  • the cold-resistant liquid is accordingly added to the carbon dioxide mixture shortly before it emerges from the jet device.
  • the cold-resistant liquid can be set in terms of quantity via the second metering unit 12 if it is not already contained in the liquid gas.
  • the second metering unit 12 can be designed in such a way that a cross section is completely blocked and the addition of the cold-resistant liquid is dispensed with.
  • An annular gap 14 is formed between the base body 1 and the housing body 5 of the blasting device. Bores 6 provided on the housing body 5 are assigned to the annular gap 14, distributed in the circumferential direction. Ambient air can optionally be sucked in via the bores 6 or another propellant gas, for example compressed air, can be added. By supplying the ambient air, the jet geometry of the exiting jet can be influenced and excessive cooling of the housing body 1 can be counteracted. The supply of the propellant gas can also influence the geometry of the jet and a cooling of the Counteract housing body 1. In addition, the exiting jet can be accelerated by the propellant gas, with the result that the cleaning effect is further improved.
  • the blasting device provides a plastic jacket 8 on the base body 1, which is used for thermal insulation.
  • a plastic jacket 8 on the base body 1, which is used for thermal insulation.
  • vacuum insulation can be provided.
  • FIG. 2 shows a basic illustration of a cleaning arrangement with the blasting device according to FIG. 1.
  • a carbon dioxide tank 16 via which the liquid carbon dioxide is provided, is connected to a supply hose 7 of the supply unit 9.
  • the supply hose 7 is connected to the first metering unit 4 of the blasting device via a screw connection 8.
  • a riser bottle or a bundle of bottles can be provided for storing the carbon dioxide, for example.
  • a pressure bottle 17, in which the cold-resistant liquid is provided is connected to the second metering unit 12 via a supply line 15.
  • a tank with a pump for the cold-resistant liquid can be provided.
  • a valve of the first metering unit 4 is usually first completely closed.
  • a valve of the second metering unit 12 is also completely closed.
  • a closure, not shown, of the C0 2 tank 16 is then opened.
  • the first metering unit 4 is then set in such a way that the desired ratio of gaseous carbon dioxide and carbon dioxide particles is provided. Typically, the setting is made so that about 40 to 60% carbon dioxide solid particles are provided and that 250 to 350 liters of gaseous carbon dioxide are produced from one kilogram of liquid carbon dioxide.
  • the cold-resistant liquid can then be added to the carbon dioxide mixture by opening the second metering unit 12.
  • a cooling head 26 can be provided as part of the device according to the invention.
  • FIG. 3 and 4 schematically show a cooling head 21, formed here by way of example from bellows-like segments 22, which is used for local cooling of at least sections 28 of the glued joint partners 26 to be separated so that these glued joint partners 26 can be separated from one another with lower mechanical forces .
  • the coolant which is conducted from a coolant reservoir (not shown) by means of fluid-tight connections to connections 25 in connecting pieces 24 on the cooling head 21 and from there into the interior of the cooling head 21, which is enclosed in a hood-shaped manner by the cooling head 21, the bonded joining partners 26 and so that the adhesive between the adhesive surfaces is cooled in such a way that the glass transition temperature of the adhesive is not reached.
  • the coolant is directed into the interior of the cooling head 21 and the solid particles of carbon dioxide typically change into the gaseous state, whereupon a large amount of cold is released inside the cooling head 21 and increases the bonded joint partners 26 arranged on the cooling head 21 and the section 28 of the adhesive layer act.
  • the adhesive between the glued joining partners 26 becomes brittle as a result and the glued joining partners 26 can be separated from one another much more easily, for example by means of hammer blows or other mechanical effects.
  • the cooling head 21 can be shifted or repositioned relative to the glued joining partners 26 and the process of cooling and separating is repeated and so the entire adhesive connection between the glued Joining partners 26 are gradually separated.
  • the brittle fracture behavior of the adhesive in the cooled state enables removal in a manner that is gentle on the material, since the joining partners 26 are not damaged. Repair bonding or re-bonding is thus made possible.
  • the device according to the invention it is possible to partially cool adhesive connections within a few seconds to a temperature of less than -70 ° C. and to separate them manually with little effort.
  • an advantageously flexible cooling head 12 in the basic form of a bellows 22 is used, which is made, for example, of elastomeric materials that have brittle properties below their glass transition temperature, and, for example, of silicone rubber and / or styrene-butadiene rubber and / or polybutadiene or the materials Can consist of TPU or TPE.
  • the cooling head 21 can, for example, be attached to ferromagnetic bonded joining partners 26 by means of attached magnets or pressed by the worker against the area 28 of the bonded joining partners 26 to be cooled using a thermally decoupled handle (not shown here).
  • the carbon dioxide CO2 or nitrogen exiting from the coolant reservoir fills the cooling head 21 and thus brings about a cooling of the contact surface 28 under the cooling head 21.
  • the temperature in the cooling head 21 can be monitored in an integrated manner via a thermocouple (not shown).
  • One or more ventilation openings 27 can be provided on the cooling head 21 for pressure equalization.
  • cooling head 21 Another possibility for the design of the cooling head 21 would be the use of metallic materials which are designed in the form of a bellows 22 or analogously to corrugated pipes or flexible hoses.
  • the invention can be used wherever adhesive connections have to be removed, in particular non-destructively, for example in the rail industry, the aircraft industry, mechanical engineering, electronics and the plastics industry: the bonding of components has meanwhile gained immense importance.
  • Particularly suitable adhesives are crosslinked adhesives which react with embrittlement and / or hardening when exposed to cold, for example epoxy resins, polyurethane adhesives and / or acrylate adhesives.
  • a simple adaptation of the shape of the cooling head 21 is advantageous, in which, for example, the bellows-like sections 22 of the cooling head 21 and / or the contact surface 23 of the cooling head 21 on the bonded joint partners 26 and the sealing elements present there are made of an elastic material that adapts elastically to the shape of the sections 28 of the bonded joint partners 26 to be separated.
  • elastically deformable materials such as TPU, TPE or other elastomeric materials can be used for this. It is advantageous here if these materials themselves again have glass transition temperatures below which they reversibly lose their elasticity and have brittle properties.
  • the basic shape of the cooling head 21 can be adapted to the shape of the bonded joint partners 26 in the area 28 of the adhesive surfaces to be separated, for example by placing an inclined cooling head 21 on an inclined adhesive surface 26 ( 8) or a rounded cooling head 21 is adapted to a rounded adhesive surface 26 (FIG. 9).
  • an inclined cooling head 21 on an inclined adhesive surface 26 ( 8)
  • a rounded cooling head 21 is adapted to a rounded adhesive surface 26 (FIG. 9).
  • the cooling head 21 is compressed when it is placed on the bonded joint partners 26 and the elastic sealing effect on the coolant is improved. This also reduces the volume of coolant required within the cooling head 21, that is to say that less coolant is required overall.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Cleaning In General (AREA)

Abstract

L'invention concerne un procédé de nettoyage pour retirer des résidus de colle se trouvant sur des surfaces, en particulier après la suppression d'une liaison de collage entre des pièces d'assemblage associées (26), du dioxyde de carbone liquide provenant d'un réservoir étant alimenté dans un dispositif à jet où il est guidé dans une chambre à expansion (2) par l'intermédiaire d'une première unité de dosage (4), un liquide résistant au froid étant ensuite ajouté à un mélange produit dans la chambre d'expansion (2), constitué de dioxyde de carbone gazeux et de particules de dioxyde de carbone, le mélange additionné du liquide résistant au froid sortant ensuite par une ouverture de sortie (18) du dispositif à jet. Cette invention concerne en outre un dispositif à jet conçu pour retirer des résidus de colle se trouvant sur des surfaces.
EP21745893.4A 2020-06-22 2021-06-22 Procédé pour refroidir et/ou séparer des éléments collés et/ou retirer des résidus de colle se trouvant sur des surfaces et dispositif à jet correspondant Pending EP4168213A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE102020003736.4A DE102020003736A1 (de) 2020-06-22 2020-06-22 Vorrichtung und Verfahren zum bauteilschonenden Trennen von Klebverbindungen
DE102020005120 2020-08-20
DE102020126452 2020-10-08
DE102021110364.9A DE102021110364A1 (de) 2020-08-20 2021-04-22 Verfahren zur wasserlosen Reinigung sowie Strahlvorrichtung hierfür
PCT/DE2021/100531 WO2021259424A1 (fr) 2020-06-22 2021-06-22 Procédé pour refroidir et/ou séparer des éléments collés et/ou retirer des résidus de colle se trouvant sur des surfaces et dispositif à jet correspondant

Publications (1)

Publication Number Publication Date
EP4168213A1 true EP4168213A1 (fr) 2023-04-26

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EP21745893.4A Pending EP4168213A1 (fr) 2020-06-22 2021-06-22 Procédé pour refroidir et/ou séparer des éléments collés et/ou retirer des résidus de colle se trouvant sur des surfaces et dispositif à jet correspondant

Country Status (4)

Country Link
US (1) US20230241651A1 (fr)
EP (1) EP4168213A1 (fr)
DE (1) DE102021005135B4 (fr)
WO (1) WO2021259424A1 (fr)

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DE4128751A1 (de) 1991-08-29 1993-03-04 Buse Kohlensaeure Verfahren zum abloesen einer aufgeklebten beschichtung
US5405283A (en) * 1993-11-08 1995-04-11 Ford Motor Company CO2 cleaning system and method
NL9401324A (nl) 1994-08-16 1996-04-01 Urenco Nederland Bv Afkoelwerkwijze en koelinstallatie.
DE19828987A1 (de) * 1998-06-29 2000-01-05 Air Liquide Gmbh Verfahren und Vorrichtung zum Reinigen einer Leiterplattenschablone oder einer Leiterplatte
DE10128413C1 (de) 2001-06-12 2002-12-19 Daimler Chrysler Ag Verfahren zum Lösen einer Klebverbindung
DE20308788U1 (de) * 2003-06-04 2003-08-28 Univ Hannover Oberflächenbearbeitungsvorrichtung
DE102007052390B4 (de) 2007-10-31 2021-01-28 Air Liquide Deutschland Gmbh Verfahren und Vorrichtung zur Reinigung von Oberflächen
DE102008061667A1 (de) 2008-12-12 2010-06-17 Jens Werner Kipp Reinigungs- und Kühldüse, die mittels flüssigem CO2 ohne Druckluftzusatz betrieben wird
EP2306467B1 (fr) * 2009-10-05 2012-02-08 Linde Aktiengesellschaft Procédé de capture de matériau durant le sablage de glace sèche
DE102010064406A1 (de) * 2010-12-30 2012-07-05 ipal Gesellschaft für Patentverwertung Berlin mbH Vorrichtung und Verfahren zum Partikelstrahlen mittels gefrorener Gaspartikel
DE102012008593A1 (de) 2012-04-27 2013-10-31 Messer France S.A.S Verfahren und Vorrichtung zum Kühlen von Produkten
EP2667116B1 (fr) 2012-05-21 2016-07-13 Messer Group GmbH Procédé et dispositif destinés au refroidissement
DE102013014912A1 (de) 2013-09-03 2015-03-05 Messer Group Gmbh Vorrichtung und Verfahren zum Unterkühlen von Kohlendioxid
FR3015331B1 (fr) * 2013-12-20 2016-01-15 Stmi Soc Des Tech En Milieu Ionisant Enceinte de protection d'un outil mobile de distribution de fluide a temperature cryogenique
DE102015219430A1 (de) * 2015-10-07 2017-04-13 Bayerische Motoren Werke Aktiengesellschaft Vorrichtung zum Reinigen von Klebeflächen
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DE102021005135B4 (de) 2023-01-19
WO2021259424A1 (fr) 2021-12-30
US20230241651A1 (en) 2023-08-03
DE102021005135A1 (de) 2022-12-22

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