EP0890807B1 - Verfahren und Vorrichtung zum Trocknen von mit einer Oberflächenbeschichtung versehenen Werkstücken - Google Patents

Verfahren und Vorrichtung zum Trocknen von mit einer Oberflächenbeschichtung versehenen Werkstücken Download PDF

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Publication number
EP0890807B1
EP0890807B1 EP98112368A EP98112368A EP0890807B1 EP 0890807 B1 EP0890807 B1 EP 0890807B1 EP 98112368 A EP98112368 A EP 98112368A EP 98112368 A EP98112368 A EP 98112368A EP 0890807 B1 EP0890807 B1 EP 0890807B1
Authority
EP
European Patent Office
Prior art keywords
hot air
air
walls
workpieces
drying
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.)
Expired - Lifetime
Application number
EP98112368A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0890807A1 (de
Inventor
Waldemar Herre
Franz Meschenmoser
Theo Finkbeiner
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.)
L T G Holding GmbH
LTG Holding GmbH
Original Assignee
L T G Holding GmbH
LTG Holding 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
Application filed by L T G Holding GmbH, LTG Holding GmbH filed Critical L T G Holding GmbH
Publication of EP0890807A1 publication Critical patent/EP0890807A1/de
Application granted granted Critical
Publication of EP0890807B1 publication Critical patent/EP0890807B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/02—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in the whole or part of a circle
    • F26B15/08—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in the whole or part of a circle in a vertical plane
    • F26B15/085—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in the whole or part of a circle in a vertical plane with endless clamp or tray conveyor, e.g. wicket conveyor

Definitions

  • the invention relates to a method for drying with a fresh surface coating Workpieces, especially sheets, where the workpieces through an enclosed drying zone conveyed while being exposed to hot air be, and being at least a portion of in the range walls in the conveying zone and / or Installation of the drying zone also with hot air is or will be acted upon.
  • the pollution problem mentioned occurs especially when using organosols, Phenolic resins or special white paints. Also takes the design of the dryer as well as the setting of his air budget on the pollution problem Influence. High levels of contamination are present the short pre-drying section in a double coating line expected.
  • From US 2 817 506 A is also a method for Drying coated surfaces of workpieces known with a hot air dryer, in which Hot air from side walls - at the level of a base plate - introduced into the interior of the dryer and derived at the top of the interior being, the hot air on the way from the bottom to meets the workpieces at the top.
  • JP 02 133 791 A is a drying system known for granules in the area of the drying zone arranged granulate drain walls with provided with a moisture-absorbing layer are the water droplets adhering to the granulate take up.
  • the invention has for its object a method for drying with a fresh surface coating provided workpieces create a pollution by falling or dripping condensate avoided is.
  • this object is achieved by that the walls in the area of an air recirculation making exhaust with hot air be charged.
  • the return of the Hot air includes both the proportion of hot air required for the workpiece treatment has been used as well the remaining portion of the hot air that is used for the removal of the pollution problem is used.
  • the areas exposed to the condensate Hot air preferably forms a hot air curtain or a hot air layer that means it sweeps over the surfaces, making it relative large areas with a relatively small amount of hot air can be treated.
  • the hot air curtain further reduces the entry of fresh, condensate forming, concentrated return air on the walls.
  • Hot air flow is branched off. So there is no additional Hot air preparation to be provided as a Part of the hot air can be used for the drying of the surface coating is available stands. If you look at the flow the one for drying the surface coating hot air used, this forms a primary Air circulation system for heating the workpieces, whereby this is superimposed by a secondary hot air circulation system will prone to heating the condensate Surfaces. Quasi is a kind of bypass system created for the primary air circulation system.
  • the hot air obliquely or parallel the condensate susceptible surfaces of the walls / internals is fed. In this way they form optimally hot air curtains and hot air layers.
  • the feed at a pretty acute angle or even in parallel brings the Coanda effect with it that is, a small pulse of hot air is sufficient around this very far along the condensate sensitive area to move.
  • the invention further relates to a device for Drying with a fresh surface coating provided workpieces, in particular Sheet metal with a hot air drying zone penetrating workpiece conveyor, with at least a portion of in the area of the production zone lying walls and / or internals of Drying zone is subjected to hot air or are, with an air recirculation and with hot air outlet nozzles blowing the workpieces.
  • the invention is characterized by walls in the area an exhaust air device performing the air return outlet nozzles with hot air or outlets.
  • the Hot air is applied in addition to that in the hot air introduced into the hot air drying zone, with which the workpieces are loaded. hereby the risk of contamination of the workpieces due to dripping condensate and also the risk of contamination inside the drying zone and also largely avoided the conveyor.
  • Hot air outlet channels in the upper area with hot air nozzles for workpiece loading owns and between the two hot air ducts Exhaust air duct is arranged, the exhaust air openings has, results along the longitudinal median planes the dryer has a zone of increased susceptibility to condensation, the production zone below this zone is therefore the one at risk of pollution Area.
  • the over the longitudinal extent of the Drying outside of the exhaust air duct is therefore above the production zone and therefore represents with regard to draining condensate particularly predestined surface.
  • This outside the exhaust air duct is according to the invention with a Hot air curtain occupied to the desired heating to achieve.
  • the hot air curtain is in the In the course of the mentioned secondary air circulation system from the exhaust air duct recorded, that is, it lies constant air exchange prior to condensation largely or even completely prevented.
  • the exhaust duct Supply air duct assigned for supplying the supply air is.
  • the exhaust air duct and the supply air duct can meet directly and only with a divider be separated from each other or it is also possible that a distance between the exhaust air duct and the supply air duct consists.
  • This side arrangement of the exhaust duct to the supply air duct results from the above already mentioned construction, in which between the exhaust air duct is arranged in the two supply air ducts is.
  • a particularly simple design results even if the supply air duct Outlet opening / outlet openings assigned is / are from which the walls and / or internals hot air exits. It is therefore only for the formation of the hot air curtain required, the existing supply air duct to be provided with outlet openings. alternative it is also possible to replace the outlet openings Use outlet nozzles.
  • outlet openings or outlet nozzles assigned at least one air guiding device, which leads the escaping hot air such that large areas that are susceptible to condensate sweeps.
  • the supply air duct Exceeds bottom of the exhaust duct that is, it there is an outstanding side wall area of the Supply air duct before, in this side wall area the outlet openings or outlet nozzles arranged for the condensation-preventing hot air could be.
  • the the bottom Exceptional side wall area of the exhaust air duct the supply air duct is also suitable to the air guide there, in particular an air baffle to attach.
  • liquid-binding Use material In addition, to avoid the Soiling of workpieces due to dripping Condensate should be provided, liquid-binding Use material.
  • a liquid binding material can be, for example, fleece or felt are used, the materials Take up condensate by storing it prevent dripping.
  • These materials are preferably arranged easily replaceable, in particular designed as disposable parts. With an exchange is the inside of the drying zone inside in a very short time in a clean state. If condensation occurs, this leads to not to drain the condensate as that Liquid binding / liquid storing material this prevents. In an advantageous manner this also means the time interval between two cleaning intervals extended so that the drying device can be used more efficiently.
  • solid, easily attachable wall cladding parts in particular sheets of sheet metal or Plastic, to be used for cleaning work to be able to carry out as quickly as possible.
  • wall covering parts are after their very easy cleaning reusable.
  • the drying zone is preferably equipped easily replaceable liquid binding or absorbent material, preferably fleece or felt, is also an easily executable, yet effective Measure to pollution of workpieces to avoid during a drying process. About that In addition, it is also possible to use existing ones Drying devices in the area of their drying zone with a fleece or felt without great technical Retrofit effort.
  • a hot sealing air curtain is generated in the area of the entrance and / or at least exit of the drying zone. This measure largely ensures entry of ambient air into the interior of the drying zone prevents, that is, the entry of Cold air largely prevented. Because the entering Cold air promotes condensation the sealing air curtain is a safe measure to avoid condensate represents.
  • All of the above measures i.e. the Heating with additional hot air, the use of liquid binding material and training a sealing air curtain at the entrance and / or Exit of the tunnel-like hot air drying zone can be used alone or in any combination to avoid or minimize condensation.
  • these measures only in Area of tunnel entry or exit be carried out, for example, in each case a length of three meters because in these areas the formation of condensate is greatest.
  • FIG. 1 shows a schematic cross section by a device 1 for drying with a freshly coated workpieces, especially sheets.
  • the device 1 which is designed as a dryer 2, has a housed Hot air drying zone 3 on the side walls 4 and 5 and a ceiling wall 6. in the Corner area between side wall 4 and the ceiling wall 6 or the side wall 5 and the ceiling wall 6 are supply air channels 7 and 8 arranged in Direction of longitudinal extension of the dryer 2.
  • Each supply air duct 7, 8 has a vertical one Side wall 9 or 10, the Sidewalls 9 and 10 spaced parallel to the associated side walls 4 and 5 run.
  • Each supply air duct 7, 8 also has a bottom wall 11, 12, the rows of over arranged the longitudinal extent of the dryer, hot air outlet nozzles spaced apart from one another 13 or 14 is enforced.
  • an exhaust air duct 15 Between the side walls 9 and 10 is an exhaust air duct 15, the ceiling of part of the ceiling wall 6 and its side walls of sections the side walls 9 and 10 are formed. Parallel a floor wall 16 runs to the ceiling wall 6 of the exhaust duct 15, the down by one Side wall area 17, 18 of the side wall 9 or 10 is towered over, so that each a step to the bottom wall 11 or 12 is trained. In the middle of the bottom wall 16 of the exhaust duct 15 is a suction slot 19 formed of the upward facing edge regions 20 and 21 of the bottom wall 16 limited becomes. The two edge regions 20 and 21 extend a bit into the interior of the exhaust air duct 15 in.
  • the air control devices 22 and 23 are each made of an angle plate 24 or 25 formed, one Leg of the respective angle plate 24, 25 on the associated side wall area 17, 18 attached and the second leg is a free leg forms in the direction of the central plane 26 Bottom wall 16 is inclined, such that the each free end diverges to the bottom wall 16.
  • the side wall areas 17 and 18 are from in rows over the length of the Dryer 2 arranged outlet openings 27 and 28 interspersed these outlet openings 27 and 28 between der.Underside 29 of the bottom wall 16 and the respective inside 30 or 31 of the free leg of the air guide 22 or 23 are located ( Figure 2). To that extent Crevice zones 32 and 33 formed from the outlet openings 27 and 28 escaping hot air flows along the bottom 29 of the bottom wall 16 of the exhaust duct 15 lead so that there Hot air curtains are formed.
  • the figure 1 shows that below of the exhaust duct 15 workpieces 34 are located as Sheets formed with a fresh surface coating are and of holding frames, not shown supported in the longitudinal direction of the Dryer 2 from a workpiece conveyor, not shown be transported.
  • the following functions result:
  • the through the dryer 2 transported workpieces 34 by means of the hot air outlet nozzles 13 and 14 emerging, supplied from the supply air ducts 7 and 8 Blow hot air so that the fresh Surface coating of the workpieces 34 dries.
  • the two, from the hot air outlet nozzles 13 and 14 escaping hot air flows unite in the drying zone and are from there through the suction slot 19 and the exhaust duct 15 discharged and after appropriate treatment - according to the recirculation principle - again introduced into the supply air ducts 7 and 8. This makes it a primary air recirculation system created.
  • the air guiding devices 22 and 23 make sure that on the bottom 29 of the bottom wall 16 of the exhaust air duct 15 forms a hot air curtain, that is, it takes place heating the underside 29. Die die Hot air forming hot air curtain also becomes discharged through the suction slot 19.
  • Figure 3 shows an arrangement that of the figure 1 corresponds, so that only differences below between the two embodiments of Figures 1 and 3 will be discussed. These differences are that the insides 35 and 36 of the side walls 4 and 5 with liquid binding material 37 are occupied. With this Liquid binding or liquid storing material 37, for example around fleece or felt. Even the bottom 29 of the bottom wall 16 of the exhaust duct 15 is with the material 37 is occupied. This also applies to the inside 38, 39 and 40 of the exhaust duct 15. The Liquid-storing material 37 has the property possible condensate to record, so that its drainage or running down is prevented. In deviation the embodiment of Figure 1 is in the embodiment 3 the bottom wall 16 of the exhaust duct 15 deeper so that the cross section of the exhaust duct 15 is enlarged.
  • FIG. 4 shows a side view of the entrance 41 of the device according to FIG. 1, the Entrance 41 is formed by an entrance opening 42 is.
  • the upper edge 43 of the entrance opening 42 becomes covered by a hood 44, which is an exhaust air duct 45 has.
  • the lower edge 46 of the entrance opening 42 hot air outlet nozzles 47 are assigned in such a way that - according to arrow 48- one from below hot sealing air curtain flowing in the Input opening 42 is formed. Due to the Hood 44 and / or the sealing air curtain is prevented that cool room air from the installation room of the dryer 2 in the entrance area of the Drying zone 3 arrives, causing condensation would be reinforced.
  • This intrusion the cool indoor air is particularly in the range of Lower edge 46 of the entrance opening 42 is critical, whereby however this intrusion due to the arranged there Hot air outlet nozzles 47 largely is prevented.
  • this material is in the upper area the inside of the hood 44 on the ceiling respectively attached to the side walls.

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)
EP98112368A 1997-07-08 1998-07-04 Verfahren und Vorrichtung zum Trocknen von mit einer Oberflächenbeschichtung versehenen Werkstücken Expired - Lifetime EP0890807B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19729147 1997-07-08
DE19729147A DE19729147C2 (de) 1997-07-08 1997-07-08 Verfahren und Vorrichtung zum Trocknen von mit einer Oberflächenbeschichtung versehenen Werkstücken

Publications (2)

Publication Number Publication Date
EP0890807A1 EP0890807A1 (de) 1999-01-13
EP0890807B1 true EP0890807B1 (de) 2002-11-13

Family

ID=7835019

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98112368A Expired - Lifetime EP0890807B1 (de) 1997-07-08 1998-07-04 Verfahren und Vorrichtung zum Trocknen von mit einer Oberflächenbeschichtung versehenen Werkstücken

Country Status (4)

Country Link
US (1) US6065225A (es)
EP (1) EP0890807B1 (es)
DE (2) DE19729147C2 (es)
ES (1) ES2186054T3 (es)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010024840B4 (de) * 2010-06-23 2016-09-22 Eisenmann Se Trockner
DE102011051879B4 (de) 2011-07-15 2023-11-09 Dürr Systems Ag Anlage und Verfahren zur Oberflächenbehandlung von Werkstücken sowie Verwendung einer solchen Anlage zum Lackieren von Werkstücken
US10605529B2 (en) 2012-05-02 2020-03-31 Duerr Systems Ag System having a process chamber for workpieces
US9970706B2 (en) * 2012-05-02 2018-05-15 Duerr Systems Ag System having a process chamber for workpieces
CN102735045B (zh) * 2012-06-19 2014-11-05 奇瑞汽车股份有限公司 一种电泳烘干炉强冷入口的除油挡板
CN115824770B (zh) * 2022-12-06 2024-06-11 西北工业大学太仓长三角研究院 一种用于测量复合材料性能的试验工装

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1399415A (en) * 1920-04-15 1921-12-06 Phoenix Hermetic Company Apparatus for drying lithographed metal sheets
US1779622A (en) * 1926-08-30 1930-10-28 Henry A Dreffein Oven
US2039429A (en) * 1931-04-16 1936-05-05 Lydon Timothy Oven and the like with heat circulating means therefor
US2198362A (en) * 1939-02-04 1940-04-23 Nat Standard Co Metal sheet drying oven
GB579187A (en) * 1945-01-06 1946-07-25 Harold Vernon Tonge A new or improved method of, and apparatus for, preventing outward heat flow through an opening of a doorless oven
DE951394C (de) * 1949-07-19 1956-10-25 Papierfabrik Palm O H G Wandueberzug fuer Raeume mit wechselnder Luftfeuchtigkeit
US2817506A (en) * 1954-07-23 1957-12-24 Edward A Albright Oven construction
US2950098A (en) * 1958-04-22 1960-08-23 Catalytic Comb Corp Coating oven
US4058908A (en) * 1973-05-22 1977-11-22 Erich Weber Apparatus for drying flat printed material
FR2257209A5 (es) * 1973-11-15 1975-08-01 Air Ind
JPH02133791A (ja) * 1988-11-14 1990-05-22 Iseki & Co Ltd 穀粒乾燥機の乾燥機枠
DE4019741A1 (de) * 1990-06-21 1992-01-02 Peter Kaehmann Trockenstation fuer feuchtigkeit enthaltende materialien
US5396716A (en) * 1993-07-20 1995-03-14 Smart Machine Technologies, Inc. Jet tube dryer with independently controllable modules
DE4324488C2 (de) * 1993-07-21 1998-02-05 Flaekt Ab Verfahren und Heißluft-Trockner zur Trocknung beschichteter Oberflächen

Also Published As

Publication number Publication date
EP0890807A1 (de) 1999-01-13
DE59806247D1 (de) 2002-12-19
US6065225A (en) 2000-05-23
ES2186054T3 (es) 2003-05-01
DE19729147C2 (de) 2002-04-18
DE19729147A1 (de) 1999-01-14

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