EP0162941B1 - Verfahren zur Steuerung der Einbrenntemperatur eines Einbrennofens für Lackdrahtherstellung sowie hierfür geeigneter Einbrennofen - Google Patents

Verfahren zur Steuerung der Einbrenntemperatur eines Einbrennofens für Lackdrahtherstellung sowie hierfür geeigneter Einbrennofen Download PDF

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Publication number
EP0162941B1
EP0162941B1 EP84106241A EP84106241A EP0162941B1 EP 0162941 B1 EP0162941 B1 EP 0162941B1 EP 84106241 A EP84106241 A EP 84106241A EP 84106241 A EP84106241 A EP 84106241A EP 0162941 B1 EP0162941 B1 EP 0162941B1
Authority
EP
European Patent Office
Prior art keywords
enamelling
retort
catalyzer
wire
current
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
Application number
EP84106241A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0162941A1 (de
Inventor
Hans-Peter Pichler
Herbert Berthold
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.)
MAG Maschinen und Apparatebau GmbH
Original Assignee
MAG Maschinen und Apparatebau 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 MAG Maschinen und Apparatebau GmbH filed Critical MAG Maschinen und Apparatebau GmbH
Priority to DE8484106241T priority Critical patent/DE3473570D1/de
Priority to AT84106241T priority patent/ATE36657T1/de
Priority to EP84106241A priority patent/EP0162941B1/de
Priority to JP60113957A priority patent/JPS60256786A/ja
Priority to ES543636A priority patent/ES8608059A1/es
Publication of EP0162941A1 publication Critical patent/EP0162941A1/de
Application granted granted Critical
Publication of EP0162941B1 publication Critical patent/EP0162941B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
    • B05C3/15—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length not supported on conveying means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/001—Drying and oxidising yarns, ribbons or the like
    • F26B13/002—Drying coated, e.g. enamelled, varnished, wires

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a baking oven according to the preamble of claim 7.
  • the wire In a known system for the production of enamelled wire from one or more wires running in parallel (DE-C 3118830), the wire, previously annealed in a stress-free annealing, passes through a lacquer application device and finally through a drying and stoving zone in a stoving retort, in which hot air is circulated in countercurrent to the wire feed .
  • the solvent vapors and fission products generated when the paint is baked on are removed from the drying zone by recirculation via a return shaft.
  • the vapors extracted from the stoving retort including the fresh air drawn in, pass through a mixing zone, a heating system and a catalyst and are heated by the heating system and the catalyst which burns the solvent vapors. If there is a sufficient amount of solvent heat, the known system can be operated in a self-sustaining manner after the heating process, that is to say without the supply of external energy.
  • enamelled wire has to be based on high quality requirements determined by standards, whereby the enamelled wire manufacturers are increasingly working on a quality standard that in some cases goes far beyond the requirements stipulated by the standards.
  • compliance with constant process conditions in the stoving furnace with regard to supply and exhaust air quantities, temperature, air and wire speed is an essential requirement.
  • comparatively narrow tolerances can be maintained with the previously known system. Difficulties arise, however, if, for example, one of the wires running in parallel breaks because the lacquer application is interrupted, as a result of which the amount of solvent present in the catalyst for combustion is reduced and the heat balance required to maintain a uniform temperature is thereby disturbed.
  • the temperature rise of the hot air passed through the catalyst caused by the combustion of the solvents in the catalyst in the previously known system is in the order of magnitude of 80-200 ° K. In a system with, for example, six wire draws, this means that if a wire fails, for example due to a wire break, the temperature rise due to combustion on the catalytic converter is reduced by a sixth.
  • the temperature rise would decrease by a sixth to 100 ° K as a result of the fault.
  • this would lead to a drop in temperature of the hot air after the catalytic converter of 20 ° K.
  • wires have to be stopped, for example when the wire cross-section has to be changed.
  • new wires are started up, the temperature increases considerably.
  • the drop in temperature that occurs when the wire is at a standstill, or the increase in temperature after the catalytic converter that occurs during wire start-up, is intended to influence the constancy of the temperature in the retort retort as little as possible.
  • the control required for this takes place via the heating system.
  • this regulation is sluggish, so that there are still fluctuating stoving conditions and thus fluctuating enamelled wire quality.
  • the fresh air supply at the wire inlet or at the wire outlet of the stoving retort could be reduced or increased, which would be a less sluggish control than via, for example, an electrical heating device, but this leads to a change in the longitudinal temperature profile and a reduction in the drying and Burning zone of available hot air, which in turn leads to fluctuations in the enamelled wire quality.
  • the object of the invention is to ensure, by simple measures, that the process conditions are kept as constant as possible, even if, as a result of disruptions in the wire feed, for example wire breakage, or shutdown or start-up of individual wire pulls when changing the wire size, the temperature of the non-circulated hot air is forced and so that the baking temperature changes.
  • a partial stream of the hot air passed through the catalyst is continuously branched off and fed back to the catalyst, the amount of hot air flowing through the catalyst increases, while the amount of solvent introduced into the catalyst and therefore also the amount of the introduced Solvent energy does not change in normal operation.
  • the temperature difference between the catalyst inlet and the catalyst outlet also decreases. If, for example, the amount of air passed through the catalyst is doubled, the temperature difference is halved.
  • the partial air stream branched off behind the catalytic converter can be introduced into the return duct immediately before the catalytic converter. Since experience has shown that some of the solvent vapors are burned as soon as they pass the electrical heating device, it is also expedient to enter the branched-off partial air flow before the glow in the return duct of the stoving retort. However, it is particularly advantageous to introduce the branched-off partial air flow into the return shaft before the mixing zone, because this is to achieve an optimal uniformity of air temperature and air speed in the return shaft.
  • a further equalization of the stoving conditions can be achieved if the circulation of the partial air flow is also used to regulate the temperature in the drying and stoving zone in the stoving retort.
  • the temperature can be kept almost constant even when the number of wires passed through the baking oven changes, for example in the event of a wire break, the circulated air quantity is reduced in order to compensate for the reduction in the quantity of solvent and thus the reduced temperature rise on the catalytic converter. If, on the other hand, the number of wire draws is increased, a constant temperature is guaranteed by a corresponding increase in the circulated partial air flow.
  • the circulating partial air flow is expediently regulated by changing the speed of the circulating air blower provided in the circulating line.
  • the control can expediently also be carried out by a flap or a slide provided in the circulation line.
  • the control can be carried out depending on the temperature determined by a temperature sensor in the drying or baking zone or depending on the temperature determined by a temperature sensor in the drying or baking zone or depending on the amount of solvent by a solvent measuring device, such as a flame ionization detector , respectively. Another possibility is that the regulation is effected depending on the number of wires passing through the furnace.
  • the total length shown schematically in FIG. 1 is used for the production of enamelled wire, preferably several wires, and essentially comprises a wire outlet 1 with bare wire coils 2, from which the wire is drawn off by a subsequent wire pulling device 3.
  • the wire With the interposition of deflection rollers, the wire finally runs into a glow 19 of the lacquer kiln, generally designated by the reference number 5, is deflected at the end thereof and arrives at a lacquer application device 6 arranged at the front end of the lacquer kiln 5, from where the wire or the parallel wire draws a burn-in retort designated 7.
  • the wires pass through a wire cooling device designated 8.
  • the wires pass through the work stations 6, 7 and 8 several times, that is, coating application device, baking retort and wire cooling device, until they are finally wound onto spools on a coating wire winding device 9.
  • the stoving retort 7 is subdivided into a drying chamber 10 and a curing or stoving chamber 11, in which the lacquer applied to the wire by the upstream lacquer application device 6 and dried in the drying chamber 10 is stoved. Furthermore, the burn-in retort 7 is assigned a return shaft, designated 12, at the left end of which a circulating air blower 13 is provided, by means of which the air is circulated in the single-circuit counterflow principle in the direction of the arrow 14, specifically in the drying chamber 10 and in the baking chamber 11 in counterflow to that in the direction of the arrow 15 transported wire.
  • the circulating air blower 13 sucks in solvent vapors and fission products of the lacquer applied to the wire and fresh air in the drying chamber 10 via the wire inlet 16, the mixing of the gases taking place in a mixing zone 17 downstream of the circulating air blower 13.
  • the glow 19 Arranged in the return shaft 12 are the glow 19, by means of which the wires guided through glow tubes of the glow 19 are annealed without stress, as well as the mixing zone 17, the heating system 4 and a catalytic converter 18 in which the solvent vapors and fission products of the lacquer are burned.
  • the air circulated in the return shaft 12 is heated both when passing through the heating system and when passing through the catalytic converter 18, and the hot air is then introduced into the baking chamber 11 of the baking retort 7 via a perforated sheet metal bushing 20 of a known type.
  • the air flow and the fresh air drawn in through the wire inlet 16 can be regulated by a flap in front of the circulating air blower 13.
  • a part of the exhaust gases circulated in the return shaft 12 is passed through an exhaust pipe 22 coaxially arranged with the glow 19 and an exhaust pipe 23 discharged into the open with a further catalyst 24 located therein.
  • the fan indicated at 25 indicates that this is a forced discharge, which may be regulated by a flap 26 arranged in the exhaust pipe 23.
  • a wire cooler 30 To the right of the exhaust pipe is a wire cooler 30, from which the wire is led to the coating device 6.
  • the perforated sheet metal bushing 20 In the downstream direction of the wire, the perforated sheet metal bushing 20 is followed by the wire cooling device 8, which has a pressure blower 31 and a suction blower 32, by means of which a differential pressure in the wire cooler 8 can be set, such that an overpressure is generated in the area of the wire outlet 33, so that fresh air can enter the burn-in chamber 11 through the wire outlet without harmful substances getting into the free atmosphere.
  • the wires running through the annealing line 19 reach the lacquer application device 6 and pass through the stoving retort 7, where the lacquer applied is stoved and the resulting solvent vapors are drawn off into the return duct 12 by means of the circulating air blower 13.
  • the wire then enters the wire cooler 8 and, depending on the lacquer application required, is repeatedly returned to the lacquer application device 6 until it is finally discharged to the enamel wire winding device 9.
  • the amount of solvent is sufficiently large, self-sustaining operation without the supply of external energy can be ensured due to the hot air generated in the return shaft 12 because the heat of the solvent is used with the aid of the catalyst 18 to operate the drying and baking process.
  • fresh air is drawn in via the wire inlet 16 and the wire outlet 33, which at the same time essentially prevents the escape of toxic unburned solvent vapors into the environment.
  • a separate circulation line 35 is assigned to the return shaft 12 according to FIGS. 3 to 5, through which a partial flow of the hot air circulated in the return shaft 12 branches off behind the catalytic converter 8 and before the catalyst is fed back into the return shaft 12.
  • a circulating air blower 36 is arranged in the circulation line 35. Due to the branched and reintroduced hot air, the amount of hot air flowing through the catalyst 18 is increased, which causes the temperature difference between the hot air before and after the catalyst 18 to decrease while the amount of solvent remains unchanged and the solvent energy in the process remains constant.
  • the branched partial flow is fed into the return shaft 12 directly upstream of the catalytic converter 18.
  • the branched partial flow of the hot air is fed before the heating system 4, whereas in the embodiment according to FIG 5 the branched-off partial stream is introduced into the return shaft 12 upstream of the mixing zone 17.
  • the embodiment according to FIG. 4, i.e. introduction of the partial flow upstream of the heating system 4 takes into account the fact that part of the solvent vapors is burned as soon as it passes through the heating system, so that it is then expedient to direct the circulating air upstream of the heating system into the return duct 12 of the branding retort.
  • the embodiment according to FIG. 5 is particularly expedient for introducing the partial flow upstream of the mixing zone, as a result of which the best equalization of air temperature and air speed in the return shaft 12 is achieved.
  • a flap 37 is arranged in the circulation line 35, a slider being alternatively provided for this purpose.
  • the air circulation and thus the temperature in the drying and stoving zone of the stoving retort 7 can thus be regulated.
  • the amount of circulated air can also be achieved by changing the speed of the circulating air blower 36. In both cases, regulation takes place either as a function of the temperature recorded by a temperature sensor (not shown) in the drying or stoving zone or by means of a solvent device, such as a flame ionization detector.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Manufacturing And Processing Devices For Dough (AREA)
EP84106241A 1984-05-30 1984-05-30 Verfahren zur Steuerung der Einbrenntemperatur eines Einbrennofens für Lackdrahtherstellung sowie hierfür geeigneter Einbrennofen Expired EP0162941B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8484106241T DE3473570D1 (en) 1984-05-30 1984-05-30 Process for monitoring the burning temperature of a firing kiln in the laquered -thread production, and kiln therefor
AT84106241T ATE36657T1 (de) 1984-05-30 1984-05-30 Verfahren zur steuerung der einbrenntemperatur eines einbrennofens fuer lackdrahtherstellung sowie hierfuer geeigneter einbrennofen.
EP84106241A EP0162941B1 (de) 1984-05-30 1984-05-30 Verfahren zur Steuerung der Einbrenntemperatur eines Einbrennofens für Lackdrahtherstellung sowie hierfür geeigneter Einbrennofen
JP60113957A JPS60256786A (ja) 1984-05-30 1985-05-27 エナメル線製造用焼付炉およびその焼付温度制御方法
ES543636A ES8608059A1 (es) 1984-05-30 1985-05-29 Procedimiento para el control de la temperatura de secado deun horno de secado para la fabricacion de hilo esmaltado

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84106241A EP0162941B1 (de) 1984-05-30 1984-05-30 Verfahren zur Steuerung der Einbrenntemperatur eines Einbrennofens für Lackdrahtherstellung sowie hierfür geeigneter Einbrennofen

Publications (2)

Publication Number Publication Date
EP0162941A1 EP0162941A1 (de) 1985-12-04
EP0162941B1 true EP0162941B1 (de) 1988-08-24

Family

ID=8191960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106241A Expired EP0162941B1 (de) 1984-05-30 1984-05-30 Verfahren zur Steuerung der Einbrenntemperatur eines Einbrennofens für Lackdrahtherstellung sowie hierfür geeigneter Einbrennofen

Country Status (5)

Country Link
EP (1) EP0162941B1 (enrdf_load_stackoverflow)
JP (1) JPS60256786A (enrdf_load_stackoverflow)
AT (1) ATE36657T1 (enrdf_load_stackoverflow)
DE (1) DE3473570D1 (enrdf_load_stackoverflow)
ES (1) ES8608059A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106369974A (zh) * 2016-08-25 2017-02-01 铜陵华洋特种线材有限责任公司 线材干燥器

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198825B (en) * 1986-12-17 1990-08-15 Meltech Eng A furnace for use in heat treating elongate elements
DE8717519U1 (de) * 1987-05-19 1989-02-23 Lackdraht Union GmbH, 2838 Sulingen Vorrichtung zur Trocknung eines in Längsrichtung bewegten langgestreckten Gutes, z.B. eines Lackdrahtes
EP0326228A1 (en) * 1988-01-29 1989-08-02 Stork Contiweb B.V. Heating appliance
AT9379U1 (de) 2006-04-24 2007-09-15 Nhkm Consulting Gmbh Vorrichtung zum einbrennen einer lackschicht sowie verfahren zur steuerung der temperatur
CN102394155A (zh) * 2011-10-17 2012-03-28 宁德市三富机电有限公司 一种立式漆包机烘烤装置
CN102376401B (zh) * 2011-11-25 2013-03-20 无锡市梅达电工机械有限公司 中速立式漆包线机的热风循环烘烤装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1276775A (fr) * 1960-10-13 1961-11-24 Thomson Houston Comp Francaise Perfectionnements aux fours à émailler
DE1604758A1 (de) * 1964-04-21 1971-02-18 Aumann Kg Willy Einrichtung zum Trocknen von Schutzschichten auf metallischen oder nichtmetallischen Straengen beliebigen Querschnitts
AT298591B (de) * 1969-04-30 1972-05-10 M A G Maschinen Und Appbau Ges Einbrenn-Ofen in Anlagen zur Lackdraht-Herstellung
DE3118830C2 (de) * 1981-05-12 1983-05-11 MAG Maschinen und Apparatebau GmbH, 8055 Graz "Anlage zur Lackdrahtherstellung im Inlineverfahren"

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106369974A (zh) * 2016-08-25 2017-02-01 铜陵华洋特种线材有限责任公司 线材干燥器

Also Published As

Publication number Publication date
ES543636A0 (es) 1986-06-01
ATE36657T1 (de) 1988-09-15
JPS60256786A (ja) 1985-12-18
EP0162941A1 (de) 1985-12-04
ES8608059A1 (es) 1986-06-01
DE3473570D1 (en) 1988-09-29
JPH0523358B2 (enrdf_load_stackoverflow) 1993-04-02

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