EP0268774B1 - Sécheur en continu pour bois de placage - Google Patents

Sécheur en continu pour bois de placage Download PDF

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Publication number
EP0268774B1
EP0268774B1 EP87113900A EP87113900A EP0268774B1 EP 0268774 B1 EP0268774 B1 EP 0268774B1 EP 87113900 A EP87113900 A EP 87113900A EP 87113900 A EP87113900 A EP 87113900A EP 0268774 B1 EP0268774 B1 EP 0268774B1
Authority
EP
European Patent Office
Prior art keywords
dryer
moisture
fans
veneer
veneer sheets
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
EP87113900A
Other languages
German (de)
English (en)
Other versions
EP0268774A2 (fr
EP0268774A3 (en
Inventor
Friedrich Roos
Peter Brod
Wilfried Möller
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.)
Grenzebach BSH GmbH
Original Assignee
Babcock BSH AG
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 Babcock BSH AG filed Critical Babcock BSH AG
Publication of EP0268774A2 publication Critical patent/EP0268774A2/fr
Publication of EP0268774A3 publication Critical patent/EP0268774A3/de
Application granted granted Critical
Publication of EP0268774B1 publication Critical patent/EP0268774B1/fr
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
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • 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
    • F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
    • 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
    • F26B2210/14—Veneer, i.e. wood in thin sheets

Definitions

  • the invention relates to a continuous dryer for veneer sheets according to the preamble of claim 1.
  • DE-PS 27 21 965 a control method is proposed in DE-PS 27 21 965, in which the local heat consumption is measured continuously in at least two fields by measuring the temperature drop in the circulating air flows. The measured values can be used to infer the occupancy density and the initial moisture and thus the total heat requirement.
  • the temperature and / or the throughput speed are calculated with the aid of a computer and the corresponding control signals for the heating register and / or the drive motor of the conveyor are generated.
  • DE-OS 31 21 348 proposes to control the speed of the fans in order to adapt to the determined heat requirement.
  • This dryer may be suitable for drying a material web whose initial moisture fluctuates within a certain tolerance range to constant final moisture.
  • Changing radiation density is not registered by the radiation measuring device and is therefore not compensated for.
  • the document does not take into account that the functional relationship between surface temperature and residual moisture is only valid below the fiber saturation point, which for most types of wood is between about 25 and 40%.
  • the object of the invention is to limit, in a continuous dryer of the type specified in the preamble of patent claim 1, the deviations in the final moisture content from the prescribed setpoint which are caused by interfering influences, to the permissible tolerance range.
  • the arrangement of the infrared transmitter at the dryer outlet has several advantages:
  • the strong fluctuations in the initial moisture are largely compensated for at this point due to the control on the input side, so that only minor deviations occur due to measurement inaccuracies and interference effects not recorded on the input side.
  • the moisture is certainly below the fiber saturation point, and sufficiently far so that there is a clear, evaluable relationship between surface temperature and moisture.
  • the closed control loop also indirectly takes into account non-directly measurable influences, such as different occupancy density, different thickness and different bulk density.
  • the correction of the final moisture can be gradually adapted to the size of the deviations that occur.
  • the feature of claim 3 prevents individual random outliers from triggering a switching operation. As a result of the averaging over several measured values in each case, a switchover takes place only when there is a tendency towards inadmissible deviations on several successive veneer sheets.
  • FIG. 1 shows a side view of a continuous dryer for veneers according to the invention.
  • FIG. 2 shows a section along the line AA of FIG. 1 on a larger scale.
  • the continuous dryer shown in the drawing consists in the usual way of a number of rows 1 to 12 lined up. This is followed at a distance by a cooling area 13. Each area is equipped with a fan 14, nozzle internals 15 and a heating register 16. As is known, the nozzle internals cause the drying air to circulate in every field.
  • the fans 14 can be driven at two different speeds by means of pole-changing motors 17.
  • Exhaust air chimneys 18 are arranged in fields 2, 5 and 9 in the housing ceiling. Each exhaust air chimney is equipped with a flap 19 which is actuated by a controller.
  • the controller not shown in the drawing, is supplied as a controlled variable with a signal proportional to the air humidity, which is generated with the aid of an air humidity measuring device, also not shown.
  • a conveyor consisting of a carrier belt 20 and a cover belt 21, both made of wire mesh, extends over the entire length of the dryer including the cooling field 13.
  • two temperature sensors 22, 23 are attached so that one measures the temperature of the circulated air from its contact with the veneer sheets, the other thereafter.
  • Lines 24, 25 are led from the sensors 22, 23 to a control unit 26 which is equipped with a computer.
  • the computer evaluates the measured values by directly inferring the occupancy density of the conveyor and the initial moisture content of the veneer sheets passing through. From this, he calculates the required air volume flow for each field according to a specified function. In accordance with the values calculated in this way, it controls the motors 17 of the dryer section, which e.g. extends to field 8.
  • the motors of fields 9 to 12 of the dryer section on the outlet side are independent of control unit 26.
  • An infrared transducer 28 is arranged at the dryer outlet, between the last dryer field 12 and the cooling field 13. This essentially consists of a bolometer with a spectral sensitivity in the range between approximately 2 ⁇ and 12 ⁇ and an electronic converter that processes the output signal of the bolometer.
  • the infrared transducer 28 is controlled by a sensor 29, for example a light barrier, so that it is activated each time a veneer sheet passes.
  • the signal generated by the infrared transducer 28 is fed to a computer 30.
  • the continuous dryer according to the invention works as follows: The temperatures of the individual fields, as well as the air humidity and the belt speed, are preselected by hand or via a control device not belonging to the invention. This setting is made on the basis of empirical relationships, depending on the characteristic properties of the veneer sheets to be processed, in particular on the type of wood and the sheet thickness. With this basic setting, veneer sheets of medium moisture are dried to a desired final value with medium occupancy.
  • the fans in fields 1 to 4 run at high speed, the fans in fields 5 to 10 at low speed and the fans in fields 11 and 12 again at high speed. If the heat requirement changes as a result of a change in the occupancy density or as a result of a change in the initial moisture, the control unit 26 effects a corresponding adaptation of the heat supplied in the dryer section which comprises the fields 1 to 8. If there is an increased demand for heat, the fan in field 5 is first brought up to high speed, then in turn the fans in fields 6, 7 and 8, if necessary. On the other hand, if the heat requirement is reduced, the fans of fields 4, 3, 2, 1 are switched to low speed if necessary. If a further adjustment is required after switching over all available fans, the duration of treatment is changed by changing the throughput speed.
  • the control described aims to supply the veneer sheets along the entire drying path in fields 1 to 12 approximately the total amount of heat required to remove the water initially contained in the veneer, except for a remainder of e.g. Evaporate 3 to 7%.
  • This goal is usually achieved in the absence of interference, e.g. the fans in fields 9 and 10 run at low speed and the fans in fields 11 and 12 run at high speed.
  • the actual final moisture content of the emerging veneer sheets is measured with the infrared transmitter 28. If the average final moisture of several, e.g. three successive veneer sheets is outside the permissible range, the speed of the fan 10 is increased or the speed of the fan 11 is reduced, depending on the sign of the deviation. If necessary, the fan 9 or the fan 12 is then switched over.
  • controller 31 can additionally effect a change in the throughput speed and / or a warning signal can be triggered.
  • the controller already largely compensates for the initially strong fluctuations.
  • the effect of the invention does not depend on the fact that the heat requirement is determined by the method which is described in connection with the embodiment.
  • This method is generally very advantageous when the occupancy density and initial moisture fluctuate greatly. But if e.g. Veneer sheets of a uniform size, e.g. Formatted peeled veneers, which are fed to the conveyor at the same cycle, the occupancy density is constant. In this case, the occupancy density can be taken into account in the basic setting, and it is sufficient to determine the heat requirement by measuring the drop in temperature of the circulating air flow in a single field which is approximately in the middle of the dryer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Claims (3)

  1. Séchoir en continu pour feuilles de placage,
    comportant un dispositif de transport (20, 21), comportant plusieurs champs (1-12) placés en série l'un derrière l'autre, équipés chacun d'un ventilateur (14) et d'éléments (15) pour créer une circulation transversale de l'air de séchage, ainsi que d'un registre de chauffage (16),
    comportant des dispositifs (22, 23) de mesure pour déterminer la quantité d'eau à évaporer,
    et comportant un appareil de commande (26) qui agit sur la vitesse du dispositif de transport (20, 21) et/ou sur le régime de rotation de ventilateurs (14) en fonction de la quantité d'eau à évaporer,
    caractérisé par une boucle de régulation constituée d'un convertisseur infrarouge (28) disposé à la sortie du séchoir, pour mesurer l'humidité finale des feuilles de placage sortantes, et d'un régulateur (31) qui est commande par le signal du convertisseur infrarouge (28) et qui agit sur le régime des moteurs (17) des ventilateurs (14) dans une section du séchoir voisine de la sortie du séchoir afin de maintenir l'humidité finale constante.
  2. Séchoir en continu selon la revendication 1, caractérisé en e que la section voisine de la sortie du séchoir comprend plusieurs champs (9-12), et les moteurs (17) sont à nombre de pôles variable.
  3. Séchoir en continu selon la revendication 2, caractérisé en ce que pour former le signal de réglage agissant sur les moteurs (17), la valeur moyenne de plusieurs mesures successives du convertisseur infrarouge (28) est chaque fois calculée.
EP87113900A 1986-11-22 1987-09-23 Sécheur en continu pour bois de placage Expired - Lifetime EP0268774B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3639929 1986-11-22
DE19863639929 DE3639929A1 (de) 1986-11-22 1986-11-22 Durchlauftrockner fuer furnierblaetter

Publications (3)

Publication Number Publication Date
EP0268774A2 EP0268774A2 (fr) 1988-06-01
EP0268774A3 EP0268774A3 (en) 1989-05-24
EP0268774B1 true EP0268774B1 (fr) 1994-12-07

Family

ID=6314541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87113900A Expired - Lifetime EP0268774B1 (fr) 1986-11-22 1987-09-23 Sécheur en continu pour bois de placage

Country Status (4)

Country Link
US (1) US4831747A (fr)
EP (1) EP0268774B1 (fr)
AT (1) ATE115276T1 (fr)
DE (2) DE3639929A1 (fr)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3741876A1 (de) * 1987-12-10 1989-06-22 Brueckner Trockentechnik Gmbh Vorrichtung zur waermebehandlung einer breitgefuehrten textilen warenbahn
US5123261A (en) * 1990-08-20 1992-06-23 Valley Grain Products, Inc. Cooling tunnel for food products
FR2674945B1 (fr) * 1991-04-04 1993-07-23 Amdes Dispositif pour la regulation du fonctionnement en continu d'un sechoir convectif destine au sechage de produits en bande notamment du type textile.
US5603168A (en) * 1994-11-30 1997-02-18 The Coe Manufacturing Company Method and apparatus for controlling a dryer
DE19525545C1 (de) * 1995-07-13 1996-09-26 Babcock Textilmasch Trockner für durchlaufende Textilbahnen
US5651192A (en) * 1996-07-01 1997-07-29 White Consolidated Industries, Inc. Infrared temperature sensing for tumble drying control
US5915811A (en) * 1996-09-30 1999-06-29 The Board Of Trustees Of The University Of Arkansas Solar drying process and apparatus
US5992048A (en) * 1996-09-30 1999-11-30 The Board Of Trustees Of University Of Arkansas Solar drying process and apparatus
US5979524A (en) * 1997-06-27 1999-11-09 Danzer North America, Inc. Veneer slicer
FI974466A0 (fi) * 1997-12-09 1997-12-09 Stellac Oy Foerfarande foer reglering av gascirkulation
US6102090A (en) 1998-08-20 2000-08-15 Danzer North America, Inc. Flitch table mounting
US20060086421A1 (en) * 1998-08-20 2006-04-27 Hartmut Gruender Drive system for veneer slicer
DE19922165C2 (de) * 1999-05-12 2001-08-30 Babcock Bsh Gmbh Trockner für band- oder plattenförmiges Gut
DE10136966A1 (de) * 2001-07-28 2003-02-27 Brueckner Trockentechnik Gmbh Verfahren zur Wärmebehandlung einer textilen Warenbahn
FI114452B (fi) 2001-08-10 2004-10-29 Raute Oyj Menetelmä ja laitteisto tasakosteisen viilun tuottamiseksi
DE60321545D1 (de) * 2002-02-04 2008-07-24 Danzer North America Inc Furniermessermaschine
DE102007020837A1 (de) * 2007-05-02 2008-11-06 Hochschule Konstanz, Hochschule für Technik, Wirtschaft und Gestaltung Verfahren und Vorrichtung zur Trocknung von Gut
US20090061752A1 (en) 2007-08-28 2009-03-05 Current Energy Controls, Lp Autonomous Ventilation System
EP2370744B1 (fr) 2008-12-03 2019-02-20 OY Halton Group Ltd. Système et son procédé de réglage d'extraction de fumées
DE102009059822B4 (de) * 2009-12-21 2015-12-10 Grenzebach Bsh Gmbh Verfahren und Vorrichtung zum Trocknen von Gipsplatten
SE537826C2 (sv) * 2013-02-21 2015-10-27 Sp Sveriges Tekniska Forskningsinstitut Ab Metod för torkning av hygroskopiskt material och anordning för torkning av hygroskopiskt material.
US9879908B2 (en) 2013-10-17 2018-01-30 Triglia Technologies, Inc. System and method of removing moisture from fibrous or porous materials using microwave radiation and RF energy
US11143454B2 (en) 2013-10-17 2021-10-12 Joseph P. Triglia, Jr. System and method of removing moisture from fibrous or porous materials using microwave radiation and RF energy
US11384980B2 (en) 2013-10-17 2022-07-12 Joseph P. Triglia, Jr. System and method for reducing moisture in materials or plants using microwave radiation and RF energy
CN105180613A (zh) * 2015-09-17 2015-12-23 成都中机盈科科技有限公司 一种多箱体式布料无损烘干系统
CN106052349B (zh) * 2016-06-07 2018-06-01 浙江冠峰食品机械有限公司 全自动带式烘干机
CN107178983A (zh) * 2017-07-15 2017-09-19 合肥杰源机电科技有限公司 一种用于汽车零部件烘干装置
US11166482B2 (en) * 2018-09-18 2021-11-09 Packline Technologies, Inc. Modular produce drying tunnel and methods of use
CN112432484A (zh) * 2020-11-24 2021-03-02 苏州讯能光电科技有限公司 一种led壳体加工材料快速烘干装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3350789A (en) * 1966-11-23 1967-11-07 Crown Zellerbach Canada Ltd Method of determining the moisture content of thin porous materials
US3474544A (en) * 1967-07-07 1969-10-28 Coe Mfg Co The Veneer dryer with plural treating zones
US3625812A (en) * 1968-12-18 1971-12-07 Beloit Corp Presize moisture control system for a papermaking machine
US3959723A (en) * 1974-09-13 1976-05-25 Wagner Delmer W Lumber moisture measurement apparatus which is less sensitive to lumber movement and spacing
DE2721965C2 (de) * 1977-05-14 1986-09-11 Babcock-BSH AG vormals Büttner-Schilde-Haas AG, 4150 Krefeld Verfahren zur Überwachung und Steuerung der Trocknung von Furnierblättern im Durchlaufverfahren
US4183292A (en) * 1977-10-12 1980-01-15 Tree Top, Inc. Continuous flow system for equalizing the moisture content of moisture absorbing fruit products
US4170073A (en) * 1977-12-01 1979-10-09 Kay-Ray, Inc. Wide dynamic range multi-zone drying method and apparatus for controlling product moisture
DE3120917A1 (de) * 1981-05-26 1982-12-23 Babcock-BSH AG vormals Büttner-Schilde-Haas AG, 4150 Krefeld Durchlauftrockner fuer messerfurniere
DE3121348A1 (de) * 1981-05-29 1982-12-16 Babcock-BSH AG vormals Büttner-Schilde-Haas AG, 4150 Krefeld Durchlauftrockner fuer messerfurniere
WO1985003117A1 (fr) * 1984-01-06 1985-07-18 Oy Wilh. Schauman Ab Procede de surveillance du sechage d'un placage

Also Published As

Publication number Publication date
EP0268774A2 (fr) 1988-06-01
US4831747A (en) 1989-05-23
DE3750841D1 (de) 1995-01-19
ATE115276T1 (de) 1994-12-15
DE3639929A1 (de) 1988-06-01
EP0268774A3 (en) 1989-05-24

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