EP1395784A1 - Verfahren und einrichtung zum trocknen - Google Patents
Verfahren und einrichtung zum trocknenInfo
- Publication number
- EP1395784A1 EP1395784A1 EP02743176A EP02743176A EP1395784A1 EP 1395784 A1 EP1395784 A1 EP 1395784A1 EP 02743176 A EP02743176 A EP 02743176A EP 02743176 A EP02743176 A EP 02743176A EP 1395784 A1 EP1395784 A1 EP 1395784A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drying
- air
- condensation
- stage
- temperature
- 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
-
- 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
Definitions
- the invention relates to a method for drying water-based paints applied to an object in painting systems and a device for carrying out the method.
- waterborne paint basecoats with water as the solvent
- organic solvents which only contain a small percentage of organic solvents and are therefore ecologically superior to conventional solventborne basecoats.
- the processing of water-based paints is problematic in that water evaporates much more slowly compared to solvents and therefore, under the same operating conditions, in painting booths for water-based paints, compared to solvent-based basecoat, significantly longer evaporation and drying times are required, since the usual speed of the laminar flowing Air in painting or spray booths is only approx. 0.2-0.5 m / sec.
- Painted objects are usually dried using three methods.
- the so-called convection method is widespread.
- a circulating hot air stream transfers its heat content to the workpiece at a flow rate of 2 to 15 m / sec.
- the main advantages of this process are that all thermosetting lacquer systems and workpiece shapes can be dried and an excellent optical quality of the lacquer can be achieved.
- a disadvantage is the long residence time required in the dryer, which can be between 3 and 35 minutes, depending on the coating system, layer thickness of the coating application and the temperature used. In the case of painting plastics, the residence time in the dryer is typically 8 to 10 minutes.
- the convection process therefore requires a lot of energy and - if large quantities have to be coated per unit of time - a lot of equipment.
- a second, possible method for drying painted workpieces is so-called condensation drying.
- the moisture is removed from the paint film by means of a circulating, strongly dehumidified air stream (moisture content ⁇ 6g / kg air).
- the dwell time in the dryer is between 4 and 8 minutes, the drying temperature is approx. 300 ° C. Due to this, in comparison to convection drying, the effort for drying temperature and drying time is greatly reduced, the condensation process is inexpensive.
- the condensation process only provides an inadequate surface quality of the painted workpiece, based on the specifications required in the automotive industry, so that it is mainly used for pre-drying or pre-drying during wet-on-wet paint build-up.
- a third drying method which is becoming increasingly important, is drying by means of rays, preferably by means of infrared rays. This enables parts of the workpiece that can be directly irradiated to be dried quickly and with a good surface quality. Undercuts, on the other hand, can only be dried using heat conduction, with the risk of local overheating.
- DE 19937 193 A1 is a method for drying water-containing basecoat material, and a device and retrofit kit for painting booths for carrying out the method.
- a method and a device for carrying it out are described in order to make the drying process of water-based basecoat in painting booths particularly economical.
- it is proposed to accelerate cabin air within the painting booth and to expose the painted object to these accelerated air masses.
- the device is characterized by a painting booth, the cabin space of which heated air can be filtered and fed through the cabin ceiling and can be extracted via the cabin floor, at least one blower being provided at least in the upper third of the cabin space for generating an air mass flow to be led past the painted object.
- the invention further relates to a retrofit kit for a painting booth for carrying out the method.
- DE 41 06 573 C1 discloses a device for capacitive stray field drying of water-based paints on flat wood and wood-based material surfaces with working widths of sizes 500 mm.
- the HF feed in connection with the adaptation is designed in such a way that a high-frequency stray electric field without a magnetic field is created between the successive stick electrodes and acts on the water-based paint lamella. With little access by the electrical field to the carrier material, this remains without disruptive heating and does not require subsequent cooling.
- Water-based paints have disadvantages in drying compared to conventional paints.
- the disadvantages are that they contain a mixture with a low proportion of organic solvents and a high proportion of water and additives such as emulsifiers. Water is naturally much more difficult to dry than an organic solvent. Furthermore, due to the additives, there are also non-volatile residues that delay drying and can affect the quality of the paint.
- the disadvantages lie in the low throughput speed of the painted objects, as well as the excessive heating of the carrier material and the environment. The result is higher energy losses and longer cooling times.
- the painted object is blown off with accelerated air. Compressed air is used to generate the accelerated air flow. This requires a correspondingly high energy requirement on the one hand and a processing system for the separation of oil and other impurities on the other.
- the air escaping at high speed will whirl up dust and paint residues and deposit them on the painted surface, which can damage the paint surface.
- the invention is therefore based on the object of providing an economical drying process for water-based paints, in which, at a higher throughput speed, the temperature in the support material and the immediate surroundings is kept low, more uniform drying and high paint surface quality is achieved. Furthermore, the invention aims to provide a corresponding device for performing the method.
- the object is achieved by a method in which the water-based paint applied to the object is dried after passing through a known evaporation zone in two condensation stages connected in series and one convection stage.
- a known evaporation zone parts of organic solvents are removed at a temperature in the range from 20 to 260 ° C, a relative humidity of 50 to 80% over a specified period of at least 2 minutes.
- the paint film is calmed down so that trapped air can escape.
- the painted object then passes through a first condensation drying stage. Drying takes place over a period of 1 to 3 minutes at an air speed of 0.05 to 5 m / sec, a temperature in the range from 25 to 350 ° C. and an air humidity of 1 to 5 g / kg of air.
- the air is blown in through the filter ceiling or the walls or alternatively via nozzles. In this zone, the dehumidification of the paint film begins at lower air flow speeds.
- the painted, pre-dried object then goes through a second condensation drying stage.
- the paint film is dried over a period of 2 to 8 minutes at an air speed of 0.5 m / sec to 12m / sec, an air humidity of 1 to 5 g / kg of air and a temperature in the range from 25 to 350 ° C.
- the air intake is in turn via a filter ceiling or walls or alternatively via nozzles.
- the paint film is further dehumidified at a higher air flow rate to a value below 10% residual moisture in the paint film.
- a convection drying stage connected in series, the painted object being blown off with air at a temperature in the range from 50 to 900 ° C. over a period of 2 to 5 minutes.
- the surface of the paint film is cross-linked. Residual water content and residual organic solvent content are reduced to a minimum.
- the painted objects are cooled to a temperature below 300 ° C in a cooling zone. Depending on the material, the object temperature is usually reduced with pre-cooled air.
- the coating film is additionally crosslinked on the surface due to the warm air drying in the convection drying stage.
- FIG. 1 shows a diagram of the device according to the invention for carrying out the method.
- the device consists of a cabin space 1, in which an evaporation zone 2, a first condensation drying stage 3, a second condensation drying stage 4, a convection stage 5 and a cooling zone 6 are arranged in series.
- Each of the individual zones or stages has a separate air supply or discharge.
- a cable conveyor is arranged in the ceiling area 1. This transports the objects arranged on a hanger - in this example, bumpers - through the zones or steps arranged in cabin space 1.
- the bumper fixed to the hanger enters the evaporation zone 2 at the entrance to the cabin space 1, after which it has been provided with a water-based paint film in a painting system (not shown). For the evaporation of organic solvents and to calm the paint film, the bumper stays in the evaporation zone 2 for approx.
- the bumper enters the first condensation drying stage 3. With a dwell time of 1 minute and an air humidity of 3g / kg air the dehumidification of the paint film attached to the bumper begins.
- the temperature of the air introduced is 300 ° C.
- the air is blown in by means of one or more fans 7 through a filter ceiling or walls.
- the flow speed is set at 0.5 m / sec.
- the fans 7 are designed so that they are preferably continuously adjustable.
- the bumper is then passed on to the second condensation drying stage 4.
- the paint film is dried further with a residence time of 4 minutes, a temperature of 300 ° C and a humidity of 3g / kg air.
- the air is blown in over the filter ceiling or walls by means of fans 7.
- the flow rate is 1 m / sec and is therefore higher than in condensation drying stage 3.
- the paint film is dried to a residual moisture content below 10%.
- the bumper is then moved to convection drying level 5. With a dwell time of 3 minutes and an air temperature of 600 ° C, the surface of the coating film is cross-linked. Residual water content and residual organic solvent content are reduced to a minimum. In the adjoining cooling zone 6, the bumper is cooled to an object temperature below 300 ° C. and then leaves the cabin space 1 via the exit.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10128794A DE10128794B4 (de) | 2001-06-15 | 2001-06-15 | Verfahren und Einrichtung zum Trocknen |
DE10128794 | 2001-06-15 | ||
PCT/EP2002/006387 WO2003002924A1 (de) | 2001-06-15 | 2002-06-11 | Verfahren und einrichtung zum trocknen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1395784A1 true EP1395784A1 (de) | 2004-03-10 |
EP1395784B1 EP1395784B1 (de) | 2006-05-24 |
Family
ID=7688220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02743176A Expired - Lifetime EP1395784B1 (de) | 2001-06-15 | 2002-06-11 | Verfahren und einrichtung zum trocknen |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1395784B1 (de) |
AT (1) | ATE327490T1 (de) |
CZ (1) | CZ297836B6 (de) |
DE (2) | DE10128794B4 (de) |
ES (1) | ES2264483T3 (de) |
WO (1) | WO2003002924A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011119733A1 (de) * | 2010-12-15 | 2012-06-21 | Heinz-Glas Gmbh | Infrarot-Trocknungsanlage |
DE102015214711A1 (de) | 2015-07-31 | 2017-02-02 | Dürr Systems Ag | Behandlungsanlage und Verfahren zum Behandeln von Werkstücken |
DE102015214706A1 (de) | 2015-07-31 | 2017-02-02 | Dürr Systems Ag | Behandlungsanlage und Verfahren zum Behandeln von Werkstücken |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3842642A1 (de) * | 1988-12-18 | 1990-07-05 | Bookmann Gmbh | Verfahren und vorrichtung zum traenken oder beschichten von gegenstaenden |
DE4106573C1 (en) | 1991-03-01 | 1992-07-16 | Josef Prof. Dr.-Ing. 8200 Rosenheim De Gefahrt | Water-based wood varnish drier - applies capacitative stray field to horizontal conveyor of low dielectric loss carrying flat wood pieces or wooden surfaces greater than 500 mm in width |
DE9109134U1 (de) * | 1991-07-24 | 1991-10-02 | Herrmann, Johannes, 8490 Cham | Lackier- und Trocknungskabine |
US5396716A (en) * | 1993-07-20 | 1995-03-14 | Smart Machine Technologies, Inc. | Jet tube dryer with independently controllable modules |
DE19644717A1 (de) * | 1996-10-28 | 1998-04-30 | Schlierbach Gmbh | Verfahren zum Trocknen von dünnen Schichten sowie Vorrichtung zur Durchführung des Verfahrens |
US6035547A (en) * | 1998-08-17 | 2000-03-14 | Chrysler Corporation | Water-borne basecoat flash process |
DE19937193B4 (de) | 1999-08-06 | 2006-01-19 | Tiemo Sehon | Verfahren zum Trocknen von wasserhaltigem Basislack sowie Einrichtung und Nachrüstsatz für Lackierkabinen zur Durchführung des Verfahrens |
US6291018B1 (en) * | 1999-11-15 | 2001-09-18 | Ppg Industries Ohio, Inc. | Method for applying a composite coating having a polychromatic effect onto a substrate |
DE10030383C1 (de) * | 2000-06-21 | 2001-10-04 | Daimler Chrysler Ag | Verfahren und Vorrichtung zum nicht-thermischen Trocknen von mit einem Wasserbasislack frisch lackierten Gegenständen, insbesondere Kraftfahrzeugkarosserien |
-
2001
- 2001-06-15 DE DE10128794A patent/DE10128794B4/de not_active Expired - Fee Related
-
2002
- 2002-06-11 WO PCT/EP2002/006387 patent/WO2003002924A1/de active IP Right Grant
- 2002-06-11 AT AT02743176T patent/ATE327490T1/de not_active IP Right Cessation
- 2002-06-11 DE DE50206907T patent/DE50206907D1/de not_active Expired - Lifetime
- 2002-06-11 ES ES02743176T patent/ES2264483T3/es not_active Expired - Lifetime
- 2002-06-11 EP EP02743176A patent/EP1395784B1/de not_active Expired - Lifetime
- 2002-06-11 CZ CZ20040066A patent/CZ297836B6/cs not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO03002924A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10128794A1 (de) | 2003-01-02 |
CZ200466A3 (cs) | 2005-02-16 |
CZ297836B6 (cs) | 2007-04-11 |
ATE327490T1 (de) | 2006-06-15 |
WO2003002924A1 (de) | 2003-01-09 |
ES2264483T3 (es) | 2007-01-01 |
DE10128794B4 (de) | 2005-02-17 |
DE50206907D1 (de) | 2006-06-29 |
EP1395784B1 (de) | 2006-05-24 |
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