EP0215409A2 - Procédé, dispositif et moyen pour enlever une couche de vernis - Google Patents
Procédé, dispositif et moyen pour enlever une couche de vernis Download PDFInfo
- Publication number
- EP0215409A2 EP0215409A2 EP86112382A EP86112382A EP0215409A2 EP 0215409 A2 EP0215409 A2 EP 0215409A2 EP 86112382 A EP86112382 A EP 86112382A EP 86112382 A EP86112382 A EP 86112382A EP 0215409 A2 EP0215409 A2 EP 0215409A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- station
- swelling agent
- primer
- objects
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
- B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
- B44D3/16—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning
Definitions
- the invention relates to a method for removing a lacquer layer, in particular a lacquer layer produced by powder coating, to a system, in particular for carrying out such a method, and moreover to a primer which should preferably be used in the method according to the invention and finally the usability of the invention Primer as an adhesion promoter.
- the invention described above has the task of specifying a method for removing a lacquer layer which can be used reliably and at the same time is as environmentally neutral or environmentally friendly as possible.
- this object is achieved in that a swellable base layer is applied to the unpainted object and later, when the lacquer layer is to be removed, flaws which are distributed as finely as possible are produced and the "damaged" object is then a swelling agent which passes over the flaws reaches the base layer and causes it to swell, is exposed. This causes the lacquer layer to burst open, which, if the lacquer does not fall off by itself, enables easy mechanical removal of the lacquer parts.
- the necessary defects can basically be created in different ways. E.g. mechanically by cutting lines or punctures or the like. However, it is particularly preferred in the context of the invention that the defects are produced by a strong cold effect, for example by temperatures of less than minus 40 ° C., for which purpose the base layer and the lacquer layer have different expansion coefficients should have, although the sudden delay in the temperature drop acts in the same sense even with a sudden action. This creates fine surfaces on or in the base layer of such objects continuous cracks through which the swelling agent then reaches the base layer.
- the base layer is swellable, which means that a whole series of different substances can be used for the process according to the invention.
- a primer on a protein or protein basis has proven to be particularly useful for the base layer. It is particularly advantageous that a natural substance which in no way pollutes the environment is used and that simple alkaline water can be used as the swelling agent, which likewise does not give rise to any problems with regard to waste water, emissions etc.
- an object whose paint layer is removed should be exposed to the effects of cold for a relatively long time, for example 10 to 20 minutes, but to the swelling agent for a relatively short time, for example 2 to 7 minutes. It is preferred that such an object is quenched or cooled for 15 minutes and exposed to the swelling agent for 5 minutes.
- the object is additionally subjected to ultrasound to remove the lacquer layer.
- the exposure to ultrasound can be carried out separately or together with the action of the swelling agent.
- the idea of the invention is in no way limited to this.
- the method according to the invention can also be used to remove other coatings, such as other highly resistant reaction layers.
- the object of the invention is to provide a system with which a method for removing a lacquer layer, in particular a method in one of the configurations described above, can be carried out.
- this object is first and essentially achieved in that a cooling station and a swelling agent station are provided.
- the coolant station serves to cool down and thus open the lacquer layer of the object to be removed, and the swelling agent station serves to cause further lacquer parts to be blown open and open.
- a station for mechanical cleaning is therefore provided, which can be constructed in different ways in principle.
- the objects can be subjected to mechanical shocks or treated with scraping tools.
- brush tools it has proven to be particularly expedient to arrange brush tools in the mechanical cleaning station, which can be rotated, if necessary, and to which the objects to be cleaned can be moved or to which the objects to be cleaned can be guided.
- a device for loading the objects provided with ultrasound which can be provided either in addition to the mechanical cleaning station or without the mechanical cleaning station.
- ultrasound the lacquer parts or lacquer splinters are set in high-frequency vibrations, which supports their loosening from the surface and also partially lets them fall off the object to be cleaned. It is particularly expedient to integrate the ultrasound device into the coolant station since the objects are usually acted upon for a relatively long period of time.
- the coolant station there are various possibilities. E.g. this can basically only be a frozen room. However, a tank filled with a frozen medium, such as liquid nitrogen, is preferred, since this enables more intensive heat transfer.
- the swelling agent station E.g. this can consist of a spraying system with which the objects are sprayed with swelling agent.
- a basin is also preferably provided here which contains alkaline water as a swelling agent.
- the entire system described is connected to one another in that suitable means of transport are provided which, if necessary automatically, transport the items to be cleaned from one station to another.
- This transport is preferably carried out in this way, in particular when the inventive method described at the outset is used in one of its embodiments, that the objects are first placed in the coolant station, that is to say immersed in the liquid nitrogen, remain there for about 15 minutes and then, practically as far as possible cooled to the temperature of the coolant, transported to or to the swelling agent station where they are exposed to the swelling agent for about 10 minutes.
- the objects to be cleaned are then first brought back into the cooling station, that is to say immersed in the bath of liquid nitrogen, where they remain for another 10 minutes, and the objects to be cleaned are simultaneously acted on by ultrasound.
- the objects are then brought into the mechanical cleaning station, for example exposed to the brushes, in order to brush or scrape off the layer of lacquer, which, as long as it has not yet fallen off or flaked off in the previous processing stages, is only loosely connected to the objects.
- Primer and also the use of the primer, which is particularly suitable for use in the method described above and is used to form a barrier or explosive layer for improved removability of a lacquer layer from objects.
- a primer according to the invention is characterized in that it has a basic component in the form of a protein or protein compound and a solvent.
- the protein compound is mixed or modified with ⁇ -caprolactam.
- ⁇ -caprolactam the elasticity of the primer can be adjusted. Since the desired elasticity can vary depending on the intended use, the addition of ⁇ -caprolactam can vary accordingly. Usually this is in a range of 5 to 25% of the protein or protein solids.
- the protein or protein compound preferably consists of lactic acid casein.
- This lactic acid casein has a solids content in the range from 10 to 40%, preferably in a range from 15 to 30%, and is dissolved in alkaline water.
- Another teaching according to the invention relates to using the primer in one of the configurations described above as an adhesion promoter. As such, it can generally be used to improve the adhesive strength of materials to be combined with one another, for example in synthetic resins, PVC, metal, plastic fibers and leather.
- This system consists of a cooling station 1, a swelling agent station 2 and a mechanical station Cleaning 3. There is also an ultrasound device 4 in the cooling station 1.
- the cooling station 1 and the swelling agent station 2 each consist of a suitable pool.
- the cooling station 1 there is liquid nitrogen in this basin, so that the basin has a temperature of approximately 200 ° minus.
- the coolant station 2 there is process water in the basin, the content of which is adjusted to a pH of 9 with alkalis. Sodium hydroxide solution, potassium hydroxide solution and various amine compounds can be used for this purpose.
- the station for mechanical cleaning 3 consists of rotating brushes 7.
- these are two brushes 7 rotating in opposite directions, between which an object 8 to be cleaned can be carried out. It can be provided that the brushes 7 are adjustable with respect to their distance from one another.
- Objects 8 to be stripped for example frames on which parts can be held during powder coating, are first immersed in the cooling station 1, that is to say in the liquid nitrogen 5 located in the basin, and remain in the cooling station preferably about 15 minutes. Due to the different expansion coefficients of the primer layer according to the invention and of the lacquer layer, finely divided cracks appear in the surface of the object 8.
- the articles 8 are subsequently brought from the cooling station 1 into the swelling agent station 2 and immersed in the alkaline water 10.
- the swelling agent, the alkaline water 6, penetrates into the previously created cracks in the objects 8 and causes the primer to swell, and on the other hand, since the objects are very supercooled, it also freezes very quickly in the cracks, resulting in an additional explosive effect .
- the articles 8 remain in the swelling agent station 2 for about 5 minutes.
- the objects 8 are then brought back from the swelling agent station 2 into the cooling station 1, where they are again exposed to the liquid nitrogen 5 for about 5 minutes.
- ultrasound radiation of the objects 8 is carried out with the aid of the ultrasound device 4. This ultrasound radiation increases the loosening of the lacquer layer to be removed from the objects 8.
- the objects 8 are passed between two brushes 7 in the mechanical cleaning station 3. With the help of the brushes 7, the paint parts still adhering, a larger part usually falls off at the latest during the second treatment in the cooling station 1, removed or brushed off.
- the swellable base layer according to the invention is also used for the first time, that is to say bare frames. It understands that the racks 8, insofar as this is necessary, must be degreased before the base layer according to the invention is applied.
- Racks 8 which have already been used and which have not previously been provided with a swellable base layer according to the invention are to be cleaned in a conventional manner, that is to say by sandblasting or by processes using acids, for example based on methylene chloride, acetic formic acid and phenol.
- the swellable base layer according to the invention or the primer according to the invention contains no solvents other than water, so that the frames 8 coated with the base layer can dry out in a normal atmosphere. Special precautions due to dangerous vapors or the like do not have to be taken. After about 30 minutes, depending on the humidity in the drying air, the applied base layer is usually dry.
- the resulting film does not become thermoplastic at higher temperatures and does not decompose even at temperatures up to 280 ° C. Since it has been found that the bond between the base layer and the lacquer layers applied thereon is otherwise extremely good, the primer according to the invention can generally be used as a secondary agent.
- swellable base layer 15 parts by weight of lactic acid casein, 30 mesh; (this component can also comprise up to 30 parts by weight); 2 parts by weight of borax; 1 part by weight of bactericide or fungicide (mold prevention agent); Residual parts by weight: water
- the mixture of 100 parts by weight thus obtained is mixed with up to 30% ⁇ -caprolactam.
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3532264 | 1985-09-10 | ||
| DE3532264A DE3532264C1 (de) | 1985-09-10 | 1985-09-10 | Verfahren zum Entfernen einer hochbestaendigen Reaktionsschicht und Anlage zur Durchfuehrung des Verfahrens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0215409A2 true EP0215409A2 (fr) | 1987-03-25 |
| EP0215409A3 EP0215409A3 (fr) | 1988-01-13 |
Family
ID=6280562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86112382A Withdrawn EP0215409A3 (fr) | 1985-09-10 | 1986-09-08 | Procédé, dispositif et moyen pour enlever une couche de vernis |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0215409A3 (fr) |
| DD (1) | DD254893A5 (fr) |
| DE (1) | DE3532264C1 (fr) |
| DK (1) | DK432986A (fr) |
| FI (1) | FI863578A7 (fr) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB397828A (en) * | 1931-03-16 | 1933-08-31 | Serge Wittouck | Process for the manufacture of varnish having a base of albuminoid |
| DE3436132A1 (de) * | 1983-10-03 | 1985-04-11 | Air Products And Chemicals, Inc., Allentown, Pa. | Verfahren zur entfernung von anstrichschichten |
-
1985
- 1985-09-10 DE DE3532264A patent/DE3532264C1/de not_active Expired
-
1986
- 1986-09-05 FI FI863578A patent/FI863578A7/fi not_active IP Right Cessation
- 1986-09-08 EP EP86112382A patent/EP0215409A3/fr not_active Withdrawn
- 1986-09-09 DD DD86294263A patent/DD254893A5/de unknown
- 1986-09-10 DK DK432986A patent/DK432986A/da not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FI863578L (fi) | 1987-03-11 |
| FI863578A0 (fi) | 1986-09-05 |
| DK432986A (da) | 1987-03-11 |
| EP0215409A3 (fr) | 1988-01-13 |
| DD254893A5 (de) | 1988-03-16 |
| FI863578A7 (fi) | 1987-03-11 |
| DE3532264C1 (de) | 1987-05-21 |
| DK432986D0 (da) | 1986-09-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| AK | Designated contracting states |
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| PUAL | Search report despatched |
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| AK | Designated contracting states |
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| 17P | Request for examination filed |
Effective date: 19880321 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19890330 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MORGENSTERN, NORBERT Inventor name: MEINHARDT, STEFAN |