EP0934497A1 - Method and device for drying thin coatings - Google Patents
Method and device for drying thin coatingsInfo
- Publication number
- EP0934497A1 EP0934497A1 EP97945828A EP97945828A EP0934497A1 EP 0934497 A1 EP0934497 A1 EP 0934497A1 EP 97945828 A EP97945828 A EP 97945828A EP 97945828 A EP97945828 A EP 97945828A EP 0934497 A1 EP0934497 A1 EP 0934497A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- drying
- housing
- dry air
- layers
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
- F26B2210/12—Vehicle bodies, e.g. after being painted
Definitions
- the invention relates to a method for drying thin layers (thin layers) based on water, solvent or alcohol, which have been applied to objects by spraying, dipping or brushing, and a device for carrying out the method.
- the materials described are used for coating a wide variety of objects, for example for coating and painting auto parts, machine components, metal sheets and the like.
- the coatings are applied and then dried.
- drying is carried out either by infrared radiation or by passing warm air over the coated objects, so that the drying is carried out by heat convection.
- the coated objects are simultaneously exposed to warm air and an additional infrared radiation.
- the workpieces are heated to 60 ° C to 120 ° C in order to evaporate the moisture contained in the thin layer.
- the methods belonging to the prior art have the disadvantage that they are very energy-intensive and time-consuming, the latter in particular by heating the workpiece on which the thin layer is applied, so that drying takes several hours.
- the workpieces after drying, the workpieces must be reduced from their heating temperature, i.e. from 60 ° C to 120 ° C, to approximately 30 ° C. be cooled so that these parts can be further processed and these parts can be handled.
- a major disadvantage is also the formation of skin over still moist base layers when painting with warm air and the heating of the workpieces to high temperatures.
- the technical problem on which the invention is based consists of a drying method and a device Specification for performing the method, in which the drying time is significantly reduced, in which there is a significantly lower energy consumption, and which is also applicable to heat-sensitive parts.
- air used for drying, which has a relative humidity between 0% and 30%, preferably a relative humidity of about 10% (dry air), and in that the dry air over and / or around the workpiece to be dried is conducted, the dry air absorbs the moisture of the thin layer applied to the workpiece.
- dry air absorbs the moisture of the thin layer applied to the workpiece.
- the fact that the workpiece is supplied with dry air at all times maintains an approximately equal vapor pressure difference, which accelerates the evaporation of moisture on the workpiece surface. The moisture released in vapor form is immediately absorbed by the ambient air.
- the dry air is obtained by cooling so-called “moist air”, ie air with a relative humidity of more than 40%, in a dry air unit by condensation. After dewatering, the air is warmed up again and fed to the paint to absorb moisture.
- misist air ie air with a relative humidity of more than 40%
- the dry air absorbs the moisture of the thin layer on the workpieces.
- the workpieces are in a housing.
- the housing can be designed as a cabinet for receiving the workpieces, in which, for example, large workpieces, such as lower parts of buses or the like, are arranged.
- the drying process according to the invention represents a closed system in which no exhaust air is produced. This has the advantage that no odorous substances, no moisture and no heat are transported outside.
- the heat generated by the dehumidification of the air is used to reheat the air after the dehumidification.
- the dehumidified air is heated to a temperature of approximately 15 ° C to 60 ° C. This is sufficient for drying with dry air.
- the method according to the invention has the following advantages:
- the housings intended for drying are adapted to the conditions of the individual case. If, for example, vehicle undercarriages of buses are to be dried, a corresponding dryer tunnel is required, through which the entire underbody of a bus can be passed.
- a kind of drawer system can be provided for drying railway and car models, in which each model is arranged individually. The dry air is led through the individual drawers of the drawer system.
- the process according to the invention has the advantage that drying takes much less time than with the processes belonging to the prior art.
- the drying process takes between three and ten minutes, depending on the material and surface. In the case of very jagged parts, the time required can increase to twelve to fifteen minutes. This is because the dry air is cracked and recesses can not penetrate so well, so that there is air in these cracks and recesses, which is saturated with liquid, so that the drying process stagnates.
- air circulation can be ensured in all cracks and recesses by means of a blower or by means of nozzles.
- the time for air drying is around three to four minutes.
- the time for air drying depends on the type of coating liquid used.
- Another advantage of the method according to the invention is that only 10% to 25% of the energy expenditure of the methods belonging to the prior art is required.
- Fig. 2 shows a drying device with an additional cooling device.
- FIG. 1 shows a device (1) with a dewatering device (2) for a water-based lacquer layer through which moist air (3) is passed.
- the moist air (3) is dewatered in the dewatering device (2) by condensation such that the air has a partial vapor pressure of 0 to 16 mbar.
- the condensate (12) is collected in a basin (4).
- the condensed air (5) is passed through a heating device (17) and by means of a fan (7) in the direction of arrow (A) in an area (8) of the device (1).
- the dry air sweeps through circulation over workpieces (9) which are coated and are to be dried.
- the dry air absorbs the moisture from the paint, so that the air in area (10) in turn has a higher relative humidity.
- the moist air is fed in the direction of arrow (B) back to the dewatering device (2), where the water (3) is extracted again.
- the air in the area (8) has a temperature of 15 ° C to 60 ° C.
- the workpieces (9) are not significantly heated when they are swept with the dry air heated to 15 ° C to 60 ° C, since the surface of the workpieces (9) remains cold due to the evaporative cooling.
- the device (1) forms a closed circuit for the circulating air.
- the device (1) can also be operated with an open circuit.
- the device (1) can be designed as a continuous system with open passage openings for the parts to be dried.
- the device (1) has a housing (11) in which the process of dewatering the air, heating the dry air, drying the workpieces and returning the moist air to the dewatering device (2) is carried out in a closed circuit.
- the device works in the same way for drying any kind of thin layers, be it on water. water, alcohol or other solvent base, but also when using fats or adhesives and the like.
- the drying device (1) in a preferred embodiment of the invention has an additional cooling device (13).
- the additional cooling device (13) a circulating refrigerant with which the dewatering device (2) is operated is cooled. This is necessary in order to maintain a low temperature level of the drainage device (2).
- the refrigerant with which the dewatering device (2) is operated is thereby heated.
- the heated refrigerant passes from the dewatering device (2) into a compressor (14).
- the refrigerant is compressed in the compressor (14), as a result of which the refrigerant heats up. This further warming is based essentially on the heat of compression.
- the compressed refrigerant passes from the compressor (14) into the refrigerant condenser (6).
- the dry air (5) is heated to a predetermined temperature in the refrigerant condenser (6) in order then to use this heated air in the area (8) for drying the workpieces (9).
- the refrigerant is pre-cooled by the release of thermal energy by the heated refrigerant to the dry air (5) in the refrigerant condenser (6).
- the pre-cooled refrigerant then passes into another refrigerant condenser (15).
- the precooled refrigerant is cooled further in the refrigerant condenser (15) with the aid of circulating air, which is removed from the surroundings of the drying device (1) by means of a fan (16).
- the circulating air is essentially at room temperature.
- the additional cooling device (13) the refrigerant used in the cooling circuit is always cooled in such a way that dewatering of the circulating air in the dewatering device (2) can be carried out optimally.
- the housing (11) of the drying device (1) can be considered as not heat-insulated Housing be formed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19644717 | 1996-10-28 | ||
DE19644717A DE19644717A1 (en) | 1996-10-28 | 1996-10-28 | Process for drying thin layers and device for carrying out the process |
PCT/EP1997/005650 WO1998019124A1 (en) | 1996-10-28 | 1997-10-14 | Method and device for drying thin coatings |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0934497A1 true EP0934497A1 (en) | 1999-08-11 |
EP0934497B1 EP0934497B1 (en) | 2002-08-07 |
Family
ID=7810187
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97945828A Expired - Lifetime EP0934497B1 (en) | 1996-10-28 | 1997-10-14 | Method and device for drying thin coatings |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0934497B1 (en) |
AT (1) | ATE221981T1 (en) |
AU (1) | AU5118998A (en) |
CA (1) | CA2269982A1 (en) |
DE (3) | DE19644717A1 (en) |
DK (1) | DK0934497T3 (en) |
ES (1) | ES2182123T3 (en) |
WO (1) | WO1998019124A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19756194B4 (en) * | 1997-12-17 | 2006-06-08 | Keld Gabelgaard | Paint processing apparatus and method |
DE10030383C1 (en) | 2000-06-21 | 2001-10-04 | Daimler Chrysler Ag | Non-thermal drying of water-based paint on bodywork, employs constant capacity dryer for recirculated air, operated with variable bypass |
DE10128794B4 (en) * | 2001-06-15 | 2005-02-17 | Rehau Ag + Co. | Method and device for drying |
JP5508272B2 (en) * | 2007-10-29 | 2014-05-28 | トランスファーマ メディカル リミテッド | Vertical patch drying |
EP2219438A4 (en) | 2007-12-10 | 2014-04-23 | Oliveira Junior Jose Vilani | Dehumidification or dehydration unit for apicultural use |
DE102015224916A1 (en) * | 2015-12-10 | 2017-06-14 | Dürr Systems Ag | Treatment plant and method for treating workpieces |
CN106270380B (en) * | 2016-08-16 | 2018-04-20 | 东风汽车有限公司 | Foamed plastic model drying room |
JP6428750B2 (en) * | 2016-11-30 | 2018-11-28 | マツダ株式会社 | Coating drying method and apparatus |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2366363A1 (en) * | 1975-06-19 | 1978-04-28 | Cominter Sa | Dryer for skins and hides - with enclosed circuit air flow over cooling coil and heating condenser |
US4365480A (en) * | 1978-09-05 | 1982-12-28 | United Air Specialists, Inc. | Process gas treating apparatus |
EP0044898A1 (en) * | 1980-07-30 | 1982-02-03 | C.C.E. s.r.l. Commissionaria Costruzioni Elettroniche | Method and apparatus for rapid drying, particularly of skins |
DE3229903A1 (en) * | 1982-08-11 | 1984-02-16 | Mohndruck Graphische Betriebe GmbH, 4830 Gütersloh | Process and device for reprocessing a drying medium used for drying solvent-containing inks, paints, adhesives or the like on paper or comparable cellulose products |
DE3637737A1 (en) * | 1986-11-05 | 1988-05-19 | Waldner Gmbh & Co Hermann | DRYERS, ESPECIALLY FOR THE CHEMICAL INDUSTRY |
DE3734994A1 (en) * | 1987-07-31 | 1989-02-09 | Guenther Zippel Maschf | Method and device for the fully automatic drying of cleaned objects |
US5343632A (en) * | 1992-04-10 | 1994-09-06 | Advanced Dryer Systems, Inc. | Closed-loop drying process and system |
DE9401195U1 (en) * | 1994-01-25 | 1994-03-31 | Bartel, Walter, 78054 Villingen-Schwenningen | Sieve drying cabinet |
DE29504040U1 (en) * | 1995-03-10 | 1996-04-04 | Harter Oberflächen- und Umwelttechnik GmbH, 88161 Lindenberg | Industrial dryer with improved efficiency |
-
1996
- 1996-10-28 DE DE19644717A patent/DE19644717A1/en not_active Withdrawn
-
1997
- 1997-10-14 CA CA002269982A patent/CA2269982A1/en not_active Abandoned
- 1997-10-14 DE DE19781220A patent/DE19781220C1/en not_active Expired - Fee Related
- 1997-10-14 AU AU51189/98A patent/AU5118998A/en not_active Abandoned
- 1997-10-14 EP EP97945828A patent/EP0934497B1/en not_active Expired - Lifetime
- 1997-10-14 DE DE59707933T patent/DE59707933D1/en not_active Expired - Lifetime
- 1997-10-14 ES ES97945828T patent/ES2182123T3/en not_active Expired - Lifetime
- 1997-10-14 AT AT97945828T patent/ATE221981T1/en active
- 1997-10-14 DK DK97945828T patent/DK0934497T3/en active
- 1997-10-14 WO PCT/EP1997/005650 patent/WO1998019124A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
KRÖLL K.: "TROCKNUNGSTECHNIK - TROCKNER UND TROCKNUNGSVERFAHREN", vol. 2, 1978, SPRINGER-VERLAG, BERLIN, ISBN: 3-540-08108-9, article "Allgemeines über Planen und Bemessen der Trockner", pages: 83 - 84, XP002932393 |
Also Published As
Publication number | Publication date |
---|---|
CA2269982A1 (en) | 1998-05-07 |
ATE221981T1 (en) | 2002-08-15 |
WO1998019124A1 (en) | 1998-05-07 |
AU5118998A (en) | 1998-05-22 |
DE19644717A1 (en) | 1998-04-30 |
DK0934497T3 (en) | 2002-10-07 |
DE59707933D1 (en) | 2002-09-12 |
DE19781220C1 (en) | 2000-04-13 |
ES2182123T3 (en) | 2003-03-01 |
EP0934497B1 (en) | 2002-08-07 |
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