EP0312888B1 - Installation de séchage pour des panneaux de construction - Google Patents

Installation de séchage pour des panneaux de construction Download PDF

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Publication number
EP0312888B1
EP0312888B1 EP88116852A EP88116852A EP0312888B1 EP 0312888 B1 EP0312888 B1 EP 0312888B1 EP 88116852 A EP88116852 A EP 88116852A EP 88116852 A EP88116852 A EP 88116852A EP 0312888 B1 EP0312888 B1 EP 0312888B1
Authority
EP
European Patent Office
Prior art keywords
drying
frequency
panels
convection
zone
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
EP88116852A
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German (de)
English (en)
Other versions
EP0312888A2 (fr
EP0312888A3 (en
Inventor
Gerhard Dipl.-Ing. Trötscher
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.)
Lindauer Dornier GmbH
Original Assignee
Lindauer Dornier 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 Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP0312888A2 publication Critical patent/EP0312888A2/fr
Publication of EP0312888A3 publication Critical patent/EP0312888A3/de
Application granted granted Critical
Publication of EP0312888B1 publication Critical patent/EP0312888B1/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
    • 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
    • F26B15/10—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 a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—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 a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/18—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 a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/343—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects in combination with convection

Definitions

  • the invention relates to a method for drying building boards, in particular gypsum fiber boards and a dryer system for carrying out the method, the boards being placed on a treadmill for drying and the water content contained in the boards being removed by supplying heat.
  • Such dryer systems for building boards are already known as convection dryers.
  • the building boards to be dried are moved one after the other into the convection dryer on a treadmill and blown there from above and below with hot air of different temperatures, which gradually leads to the undesirable water content contained in the building boards due to the relatively high air temperatures of around 80 ° C to 240 ° C is withdrawn.
  • drying times between a few minutes and an hour or more can be expected for thicker materials.
  • Significantly thicker boards, in particular gypsum fiber or gypsum particle boards with a thickness of more than 30 mm result in very long drying times of up to 6 hours and more.
  • With an hourly output of just 130 m2 a four-tier dryer with a length between 80 and 90 m would be required. This results in price disadvantages, be it in terms of machine price or the required length of the building.
  • the air is exposed to high temperatures for too long, the material, especially on the surface, suffers considerable damage and thus also loss of strength, for example due to the dehydration of the gypsum.
  • DE-PS 833 987 a device for drying wet nonwoven is known.
  • the fiber layer on gas-permeable belts is conveyed through the device, the drying area of which consists of a combination of hot steam nozzle drying with subsequent high-frequency drying.
  • the nonwoven fabric to be dried in this known device should be completely removed from the moisture; at the end of the drying process, there should be no wet spots in the nonwoven. From the aforementioned DE-PS it is not apparent that the device can be suitable as a dryer for building boards, in particular for gypsum fiber boards, which have a constantly low residual moisture at the end of the drying process in order to avoid warping of these boards.
  • the object of the present invention is therefore to provide a method and a dryer system of the type mentioned at the outset to further develop that even relatively thick and highly water-containing building boards can be dried quickly and relatively inexpensively and that the dried building boards are of high quality.
  • the invention has surprising advantages.
  • the essence of the invention is that the drying process is first carried out from the plate surface.
  • the drying process is interrupted if the material has a certain residual moisture content.
  • the residual drying is then carried out to a desired residual moisture level from the inside of the material, whereby otherwise disadvantageous, but desirable water components reach the already pre-dried surface of the building boards and there, especially with thick gypsum-bound building boards, the surface is re-moistened and thus the strength of the Increase building boards because the already interrupted setting process starts again and can continue undisturbed.
  • the invention preferably provides that the residual moisture of the building boards is kept constant by intervening in one of the drying stages or by changing the throughput speed.
  • An embodiment of the invention provides that the convection dryer is designed as a floor dryer, with hot air nozzles arranged at the top and bottom of the drying fields, the drying fields being arranged one behind the other in the direction of falling temperature.
  • a particularly rapid drying of the building boards is advantageously achieved, because the pre-drying can be carried out at an elevated temperature, and advantageously any surface areas of the building boards that have dried off are moistened again during the subsequent drying.
  • the high-frequency generator is designed as a high-frequency furnace and if a first one follows the floor dryer after an entrance lock High-frequency zone and then a second high-frequency zone is arranged via a connecting link, which is followed by an exit gate.
  • a total of two high-frequency generators are connected in series for the high-frequency furnace, which means that cheaper and easy-to-use high-frequency generators can be used overall.
  • the treadmill arranged in the high-frequency furnace is designed as a glass fiber conveyor belt.
  • the glass fiber ribbon does not impair the high-frequency properties of the high-frequency furnace, so that the energy generated only benefits the building boards to be dried in a desired manner.
  • the invention consists in that a combination between a convection dryer 6 and a high-frequency furnace 10 or high-frequency generator is used.
  • a loading table 1 is provided which is adjustable in height and via which the building boards to be dried are entered into the floor dryer 6 in the form of, for example, four floors 2 to 5.
  • the convection dryer 6 is accordingly designed as a floor dryer, ie the plates are located at levels 2 to 5 at a distance from one another and are blown or acted upon by hot air of different temperatures from below and above. It is important here that there is a relatively high air temperature of, for example, 240 ° C. at the entrance of the floor dryer 6 and that there is an air temperature of 80 ° C. at the outlet of the floor dryer in order to achieve appropriate cooling of the building boards.
  • the number of fields 7 used for the floor dryer 6 depends on the desired and required production output.
  • a removal station 8 is arranged, on which the dried plates are put in again one level at a time and at the outlet of the removal station 8 a removal table 9 is arranged, each of which picks up a building board from one floor and feeds it to the high-frequency furnace 10.
  • the high-frequency furnace 10 consists of an entrance lock 11 and has a first high-frequency zone 12, which is connected to a second high-frequency zone 14 via a connecting element 13.
  • An output lock 15 is arranged at the output of this high-frequency furnace 10.
  • the entrance lock 11 and the exit lock 15 serve to ensure that the high-frequency steel generated in the high-frequency furnace 10 does not penetrate to the outside; it becomes a radio frequency-tight Completed in the sense of maintaining a constant low residual moisture.
  • the finished, dried building panels then leave the system in the direction of arrow 16.
  • FIG. 2 shows a drying diagram of a relatively thick building board, which is explained in more detail in FIG. 3.
  • FIG. 3 schematically shows a section through a building board, such as is present in the area of the removal station 8 or the removal table 9.
  • This plate 17 has a moist core 18 and zones 19 and 20 surrounding the core, which are pre-dried by the convection dryer 6. It has now been found that when the plate 17 leaves the floor dryer 6, an unavoidably dehydrated layer 21, 22 is already formed on the top and bottom of the plate 17, because the water of hydration on the surface is removed by drying in the floor dryer becomes.
  • the main advantages of the present invention are only achieved if a convection dryer 6 is followed by a high-frequency furnace 10; The advantages are not achieved if the high-frequency oven were connected upstream of a convection dryer in order to achieve a certain predrying. What is important is the fact that an upper limit of the electrical energy to be supplied in the high-frequency furnace is not exceeded; then steam bubbles would form during the drying process and these steam bubbles would lead to the tearing of the plate 17 or at least to the formation of cracks in partial areas.
  • the power in the high-frequency furnace is therefore regulated so that only water and water vapor particles reach the surface of the building boards without further bubble formation.
  • the treadmill arranged in the high-frequency furnace is advantageously designed as a glass fiber conveyor belt. At a frequency of the high-frequency furnace of approximately 14 MHz, it does not suffer any functional impairments and does not adversely affect the drying process.
  • the residual moisture in the building boards is recorded by suitable measuring devices and can be kept constant by various methods, for example by varying the throughput speed or by regulating the power of the high-frequency field.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)

Claims (3)

  1. Procédé de séchage de panneaux de construction, notamment des panneaux du type plâtre (à armature de) fibres (ou "staff "), selon lequel les panneaux sont soumis, avec une vitesse de parcours correspondante dans une installation de séchage, tout d'abord à un préséchage par convection puis à un post-séchage à haute fréquence, procédé caractérisé en ce que le préséchage a lieu sur des panneaux déposés en étages ou comme sur des étages et ainsi transportés à travers une zone de préséchage et avec une chute de température se situant entre l'entrée et la sortie de la zone de préséchage, puis les panneaux préséchés sont regroupés et sont soumis, par modification de la vitesse de parcours ou par régulation de la charge du champ à haute fréquence, à un post-séchage réalisé de façon qu'à la fin des opérations totales de séchage, les panneaux présentent une humidité résiduelle constante.
  2. Installation de séchage pour la mise en oeuvre du procédé selon la revendication 1, cette installation consistant en un sécheur par convection effectuant un préséchage et qui est suivi d'un générateur à haute fréquence effectuant un post-séchage, et en une bande transporteuse recevant les panneaux et les guidant à travers l'installation de séchage, installation caractérisée en ce que le sécheur (6) par convection est un sécheur à étagères composé de champs individuels (7) de séchage disposés en séries les uns à côté des autres et comportant des buses ou ajutages d'air chaud, ce sécheur présentant une chute de la température de son entrée en direction de sa sortie, et en ce que le générateur à haute fréquence est un four (10) à haute fréquence qui présente une première zone (12) à haute fréquence qui suit immédiatement un sas (11) d'entrée, zone à laquelle se raccorde, par l'intermédiaire d'un élément de liaison (13), une seconde zone (14) à haute fréquence, la seconde zone (14) à haute fréquence débouchant dans un sas (15) de sortie.
  3. Installation de séchage selon la revendication 2, caractérisée en ce que la bande transporteuse se déplaçant dans le four (10) à haute fréquence est une bande transporteuse constituée par, ou comprenant, de la fibre de verre.
EP88116852A 1987-10-17 1988-10-11 Installation de séchage pour des panneaux de construction Expired - Lifetime EP0312888B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873735242 DE3735242A1 (de) 1987-10-17 1987-10-17 Trockneranlage fuer bauplatten
DE3735242 1987-10-17

Publications (3)

Publication Number Publication Date
EP0312888A2 EP0312888A2 (fr) 1989-04-26
EP0312888A3 EP0312888A3 (en) 1989-06-28
EP0312888B1 true EP0312888B1 (fr) 1994-01-19

Family

ID=6338572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116852A Expired - Lifetime EP0312888B1 (fr) 1987-10-17 1988-10-11 Installation de séchage pour des panneaux de construction

Country Status (5)

Country Link
US (1) US4890394A (fr)
EP (1) EP0312888B1 (fr)
JP (1) JPH01212886A (fr)
DE (2) DE3735242A1 (fr)
FI (1) FI884762A (fr)

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DE3811157A1 (de) * 1988-03-31 1989-10-19 K & F Voringer Gewoelbe Und Au Verfahren zur herstellung von gipsfasermaterial aufweisenden gekruemmten flaechigen gestaltungselementen
AT403713B (de) * 1990-08-27 1998-05-25 Innotech Betriebstechnikgesell Dämmplatte aus holzwerkstoff und verfahren zu deren herstellung
US5235757A (en) * 1991-08-29 1993-08-17 Abb Flakt, Inc. Method and apparatus for distributing airflow in a paint baking oven convection zone
US5309650A (en) * 1991-08-29 1994-05-10 Abb Flakt, Inc. Method and apparatus for ventilating a paint baking oven
DE29505419U1 (de) * 1995-03-30 1995-07-13 Kollmer Hansjakob Vorrichtung zum Trocknen und Härten von orthopädischen Formteilen aus Gips
FR2739999B1 (fr) * 1995-10-17 1998-01-02 Inst Textile De France Porte-matiere permettant d'appliquer un champ electromagnetique haute-frequence sur un empilement de matieres, et enceinte de traitement, notamment sechoir rapide textile haute-frequence equipe d'un tel porte matiere
DE10038169A1 (de) * 2000-08-04 2002-03-07 November Ag Molekulare Medizin Synthetisches Partikel zur Markierung einer Substanz
FR2822746B1 (fr) * 2001-04-03 2003-06-20 Lafarge Platres Unite de fabrication de plaques de platre
US6689407B2 (en) 2001-06-25 2004-02-10 Goodmark Foods, Inc. Enhanced capacity food processing systems with efficient space utilization
US6793068B2 (en) 2002-02-04 2004-09-21 Conagra Foods, Inc. Food transport routing systems, devices, and guides for food processing systems and related methods
US6713107B2 (en) * 2002-03-01 2004-03-30 Conagra Foods, Inc. Airflow distribution systems for food processors
DE102004056795B4 (de) * 2004-11-24 2006-10-12 Lindauer Dornier Gmbh Mikrowellen-Durchlauftrockner in Mehretagenbauweise für plattenförmige Produkte, insbesondere Faserplatten
US8388926B2 (en) 2006-01-13 2013-03-05 Certainteed Gypsum, Inc. System and method for the production of gypsum using heat recovery
DK1971813T3 (en) * 2006-01-13 2016-09-19 Certainteed Gypsum Inc System og fremgangsmåde til produktion af alfa-type-gips ved anvendelse af varmegenvinding
DE102006037815A1 (de) * 2006-08-12 2008-02-14 Lindauer Dornier Gmbh Transportvorrichtung für eine Mikrowellenbehandlungsanlage
JP4875543B2 (ja) * 2007-06-11 2012-02-15 西光エンジニアリング株式会社 紙管の乾燥装置及び紙管の乾燥方法
US8453343B2 (en) * 2010-01-12 2013-06-04 Hot Woods, LLC Method of treatment of wooden items
CN103090643A (zh) * 2013-01-14 2013-05-08 四川省食品发酵工业研究设计院 柑橘榨汁皮渣分段干燥方法
ES2702554T3 (es) 2016-04-26 2019-03-01 Metalquimia Sa Planta y método de secado por aire de alimento troceado
CN109269277A (zh) * 2018-09-15 2019-01-25 江西植提庄园健康产业有限公司 一种冰片鼓风干燥器
DE102019002671A1 (de) * 2019-04-11 2020-10-15 Grenzebach Bsh Gmbh Verfahren zum Trocknen plattenförmiger Materialien und Trocknungsvorrichtung
FR3112304B1 (fr) * 2020-07-10 2022-10-14 Exelsius Système pour le traitement d’un objet comprenant un matériau à réticuler.

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US2567983A (en) * 1946-12-19 1951-09-18 Wood Electro Process Company Method of drying lumber
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US2909850A (en) * 1956-02-23 1959-10-27 Celotex Corp Drying gypsum wallboard
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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
DE2816551C3 (de) * 1978-04-17 1981-11-26 SIEMENS AG AAAAA, 1000 Berlin und 8000 München Trocknungsregelung an einer Papiermaschine
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Also Published As

Publication number Publication date
JPH01212886A (ja) 1989-08-25
EP0312888A2 (fr) 1989-04-26
DE3887257D1 (de) 1994-03-03
FI884762A (fi) 1989-04-18
FI884762A0 (fi) 1988-10-14
DE3735242C2 (fr) 1990-12-20
EP0312888A3 (en) 1989-06-28
DE3735242A1 (de) 1989-04-27
US4890394A (en) 1990-01-02

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