EP0312888B1 - Trockneranlage für Bauplatten - Google Patents

Trockneranlage für Bauplatten Download PDF

Info

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
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0312888A2 (de
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/de
Publication of EP0312888A3 publication Critical patent/EP0312888A3/de
Application granted granted Critical
Publication of EP0312888B1 publication Critical patent/EP0312888B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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.

Landscapes

  • 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)
EP88116852A 1987-10-17 1988-10-11 Trockneranlage für Bauplatten Expired - Lifetime EP0312888B1 (de)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=6338572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116852A Expired - Lifetime EP0312888B1 (de) 1987-10-17 1988-10-11 Trockneranlage für Bauplatten

Country Status (5)

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

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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, 77933 Lahr 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
EP1971813B1 (en) * 2006-01-13 2016-06-15 Certainteed Gypsum, Inc. System and method for the production of alpha type gypsum using heat recovery
US8388926B2 (en) 2006-01-13 2013-03-05 Certainteed Gypsum, Inc. System and method for the production of gypsum using heat recovery
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
EP3238547B1 (en) 2016-04-26 2018-09-26 Metalquimia, SA Air drying plant and method for air drying cut-up food
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.

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2408434A (en) * 1942-03-02 1946-10-01 Julius W Mann Method and apparatus for drying materials uniformly throughout their mass
US2567983A (en) * 1946-12-19 1951-09-18 Wood Electro Process Company Method of drying lumber
US2543618A (en) * 1946-12-19 1951-02-27 Wood Electro Process Company Apparatus for drying wood
DE833987C (de) * 1950-05-23 1952-05-23 Hermann Haas Jun Dipl Ing Einrichtung zum Trocknen von nassen Faservliesen
US2909850A (en) * 1956-02-23 1959-10-27 Celotex Corp Drying gypsum wallboard
US3277580A (en) * 1963-07-05 1966-10-11 Hammtronics Systems Inc Method and apparatus for drying
DE1729250A1 (de) * 1967-03-17 1971-06-16 Lahden Rautateollisuus Oy Verfahren und Vorrichtung bei Trocknern zum Ausgleichen der Endfeuchtigkeit in Materialien
US3435535A (en) * 1967-12-04 1969-04-01 Robert C Blair Means and method for controlling the edge-drying of gypsum wallboard
US3548513A (en) * 1968-05-06 1970-12-22 Frederick T Taylor Dryer with ejectors
US3775860A (en) * 1971-06-03 1973-12-04 Mac Millan Bloedel Ltd Method for drying materials with microwave energy
JPS5022342A (fi) * 1973-06-30 1975-03-10
JPS5077957A (fi) * 1973-11-12 1975-06-25
CH583404A5 (fi) * 1975-03-18 1976-12-31 Patelhold Patentverwertung
US4148476A (en) * 1975-05-06 1979-04-10 Ab Svenska Flaktfabriken Conveyor for lamellar material
DE2613512A1 (de) * 1976-03-30 1977-10-06 Buettner Schilde Haas Ag Zweistufiges trocknungsverfahren und trocknungsanlage
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
GB2110803B (en) * 1981-10-23 1985-05-01 Balfour And Co Limited Henry Microwave drying of granular materials
JPS58117986A (ja) * 1981-12-29 1983-07-13 段谷産業株式会社 木材の乾燥方法及び装置
US4622757A (en) * 1984-12-24 1986-11-18 Energy International, Inc. Cogeneration microwave food dryer

Also Published As

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

Similar Documents

Publication Publication Date Title
EP0312888B1 (de) Trockneranlage für Bauplatten
DE2821770C2 (de) Getreidetrockner
DE3147846A1 (de) Verfahren zur verbesserung der fuellfaehigkeit von tabakmaterial
DE1946696A1 (de) Verfahren und Einrichtung fuer beschleunigte Trocknung von Gipsplatten
DE112011103784T5 (de) Zellstoffbreitrockner mit Blaskästen und Verfahren zum trocknen einer Bahn aus Zellstoffbrei
DE2554571A1 (de) Verfahren und einrichtung zum trokkenformen einer faserschicht
DE69802985T2 (de) Verfahren zum Trocknen keramischer Formkörper
DE2131758A1 (de) Verfahren zum Trocknen von Nutzholz
DE3132979A1 (de) Heizvorrichtung
DE3515045A1 (de) Verfahren und vorrichtung zum umwaelzen von heissluft in einer platten-trocknungsvorrichtung
EP0546986B1 (de) Expandieren und Trocknen von Tabak
DE69221740T2 (de) Verfahren zum Trocknen von perforierten Ziegelsteinen und Vorrichtung zum Durchführen des Verfahrens.
DE3928941A1 (de) Verfahren und vorrichtung zum gleichmaessigen trocknen von holzblaettern oder dergleichen
DE2841251A1 (de) Verfahren zur blattmaterialherstellung aus fasern und einrichtung zur durchfuehrung dieses verfahrens
EP0618418B1 (de) Verfahren zum Trocknen und Brennen von Ziegelformlingen und Mittel zum Durchführen des Verfahrens
DE19750847C1 (de) Verfahren zum Kühlen von heißverpressten Platten, insbesondere Holzspan- und Faserplatten und Kühlstrecke zur Verfahrensdurchführung
CH638256A5 (de) Vorrichtung zur herstellung von faserstoffplatten.
EP3765806B1 (de) Düsenkasten für eine trocknungsvorrichtung zum trocknen plattenartiger materialien
DE2852815C2 (fi)
DE68902831T2 (de) Vorrichtung zur trocknung von furnier und sonstigen erzeug- nissen.
EP0508254A1 (de) Verfahren und Vorrichtung zur Wärmebehandlung einer mit einer flüssigen oder pastenförmigen Zubereitung versehenen Warenbahn
DE882676C (de) Verfahren und Einrichtung zur Trocknung von Schnittholz
AT223368B (de) Verfahren zur Wärmehärtung von Formkörpern
DE3148658C2 (de) Verfahren zur Herstellung einer Futterfolie für die Heim- und Nutztierernährung
DE2834943A1 (de) Verfahren und vorrichtung zum herstellen einer fortlaufenden, aus mehreren lagen zusammengesetzten matte

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

17P Request for examination filed

Effective date: 19890420

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT SE

17Q First examination report despatched

Effective date: 19900720

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19940119

Ref country code: FR

Effective date: 19940119

Ref country code: SE

Effective date: 19940119

Ref country code: GB

Effective date: 19940119

REF Corresponds to:

Ref document number: 3887257

Country of ref document: DE

Date of ref document: 19940303

EN Fr: translation not filed
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19940119

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19950701