WO2006092198A1 - Sechoirs a placages - Google Patents

Sechoirs a placages Download PDF

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Publication number
WO2006092198A1
WO2006092198A1 PCT/EP2006/000932 EP2006000932W WO2006092198A1 WO 2006092198 A1 WO2006092198 A1 WO 2006092198A1 EP 2006000932 W EP2006000932 W EP 2006000932W WO 2006092198 A1 WO2006092198 A1 WO 2006092198A1
Authority
WO
WIPO (PCT)
Prior art keywords
drying
veneers
ironing rollers
conveyor belts
rollers
Prior art date
Application number
PCT/EP2006/000932
Other languages
German (de)
English (en)
Inventor
Behrendt Burkhard
Gatzka GÜNTER
Gress Volker
Original Assignee
Grenzebach Bsh 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 Grenzebach Bsh Gmbh filed Critical Grenzebach Bsh Gmbh
Publication of WO2006092198A1 publication Critical patent/WO2006092198A1/fr

Links

Classifications

    • 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
    • F26B13/06—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement with movement in a sinuous or zig-zag path
    • F26B13/08—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement with movement in a sinuous or zig-zag path using rollers
    • 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
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
    • 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 device for drying veneers according to the preamble of claim 1.
  • Sliced veneers tend to deform during drying due to different degrees of shrinkage.
  • the result is wavy veneers, which may have cracks and / or bruises.
  • the veneers must be dried in several consecutively arranged drying zones, each with optimally adapted parameters, such as temperature, moisture of the drying medium and effective pressure on the veneers.
  • the effective pressure on the veneers must be varied so that the wet veneers are initially exposed to low pressure and the dried veneers are smoothed by means of pressure. Therefore, a straight-line guidance of conveyor belts is followed by what is known as an ironing section, in which the veneers are often deflected and thus subjected to increased pressure. In a subsequent cooling, the result achieved in the drying is fixed, that is, the veneers are cooled rapidly under a pressure achieved by deflection of the conveyor belts.
  • a dryer for sliced veneers in which the veneers between two conveyor belts are first dried in a part with a linear guide and then in a part with loop-shaped guidance of the conveyor belts.
  • the dryer is subdivided into dry fields, which, individually or in combination, can form drying zones with the required dry climate.
  • the dry fields are followed by a cooling field with separate conveyor belts, in which the veneers are transported largely in a straight line, that is without deflections.
  • a plurality of nozzle boxes is arranged to direct treatment gas on the veneers.
  • the known devices have the disadvantage that they are relatively expensive to manufacture and assemble because of the large number of nozzle boxes. Furthermore, dust collects during operation in the nozzle boxes, which must be removed regularly.
  • the object of the invention is to provide an apparatus for drying veneers, which is inexpensive to manufacture and assemble, without causing disadvantages for the efficiency and / or the quality of the veneers.
  • the object is solved by the features of claim 1.
  • the fact that the cooling device and / or at least one of the drying zones is free of nozzle boxes eliminates the corresponding expense for the production, installation and maintenance. If only the drying zones, in which only a small amount of water should or can be evaporated per time, are free of nozzle boxes, no performance losses are to be expected. This is the case for certain types of wood such as cherry tree for the entire drying area. If necessary, losses in performance may at least be compensated for by prolonging the residence time in the drying zone concerned by repeated redirecting. Furthermore, the pressure losses in the drying zone without nozzle boxes are lower. Therefore, either the power consumption of the blower with the same amount of air is lower or with the same power consumption, a larger amount of air is promoted. Therefore, the efficiency of the electrical energy used increases.
  • the ironing zone In the third drying zone, the ironing zone, it is very important for the quality of the veneers that they are subjected to sufficient flexing work. Therefore, the residence time and the number of diversions is more important than the drying performance. This is also true because most of the water has already been evaporated in the previous drying zones and the residual water is relatively slow to evaporate. If the ironing zone is free of nozzle boxes, it is possible to redirect the conveyor belts more often and thus increase the flexing work and the residence time accordingly.
  • the arrangement of the ironing rollers in four vertical rows has proved to be particularly favorable for the leadership of the conveyor belts. Horizontal rows are advantageous for some styles, with the ironing rollers preferably extending over two panels.
  • a wrap around the ironing rollers of about 120 ° avoids a so-called bagging of the conveyor belts, in which at one point a momentarily lower of the conveyor belts is spaced from the upper, thus preventing the safe transport of the veneers.
  • the arrangement of nozzle boxes exclusively in the first drying zone ensures a high drying performance where most of the water must be evaporated per time.
  • Cross-flow fans are particularly favorable for rectangular duct cross-sections, especially at high flow rates and small pressure differences.
  • Figure 2 shows an alternative arrangement of a drying device (without cooling device).
  • a device for drying comprises a drying device 1 and a cooling device 2.
  • the drying device 1 is constructed like a box from a plurality of fields 3 and surrounded by a first housing 4. It is divided into three drying zones 5, 6, 7, which are largely sealed off from each other.
  • a first transport device for veneers is guided so that they successively in the general transport direction according to arrow 8, a first, a second and a third of the drying zones 5, 6, 7 passes.
  • the first transport device comprises two superimposed endless conveyor belts 9, between which the veneers can be conveyed from an inlet 10 to a dryer outlet 11. An upper strand of a lower of the conveyor belts 9 at the entrance 10 and the dryer outlet 11 protrudes for a short distance from the first housing 4 approximately horizontally.
  • the drivable conveyor belts 9 are guided in a substantially rectilinear manner and each return twice around deflecting rollers 12, so that the conveyor belts 9 extend in three superimposed floors.
  • the conveyor belts 9 are mutually guided (sine wave-shaped) around a plurality of ironing rollers 13, which are arranged in four substantially vertical rows.
  • the two conveyor belts 9 are returned separately to the input 10.
  • Each panel 3 is associated with means for inflating treatment gas onto the veneers.
  • the means each comprise a fan 20, a heat exchanger in the form of a heat exchanger, channels for guiding the gas and a plurality of nozzle boxes 14. These are known in the floors above and below attached to the conveyor belts 9.
  • the means for inflating comprise a fan 20, a heater and channels for guiding the gas.
  • Nozzle boxes are in the third drying zone 7 is not present, so that a cross flow of the gas is achieved with respect to the transport direction.
  • the cooling device 2 comprises two panels 3, which are surrounded by a second housing 15, and a second transport device. This comprises two superimposed endless cooling belts 16. Similar to the third drying stage 7, the drivable cooling belts 16 are guided around a plurality of smoothing rollers 17 from a cooler inlet 18 to an outlet 19 so that an upper run of a lower one of the cooling belts 16 at the cooler entrance 18 and at the exit 19 for a short distance from the second. Housing protrudes horizontally. At the outlet 19, the two cooling belts 16 are returned separately to the radiator inlet 18. The lower conveyor belt 9 and the lower cooling belt 16 are arranged as close as possible to each other between the dryer outlet 11 and the radiator inlet 18 to allow a transfer from the conveyor belt 9 to the cooling belt 16.
  • the conveyor belts 9 and the cooling belts 16 are e.g. designed as a screen belts, preferably as wide-spiral wire link belts.
  • the means for inflating comprise a ventilator 20, which is connected to the ambient air on the suction side, and ducts for conducting the air.
  • the veneers which are sheet-shaped from a block of wood having a thickness of e.g. 0.2 to 4.0 mm are cut, given at the entrance 10 to the upper strand of the lower conveyor belt 9.
  • the veneers are largely flat on the lower conveyor belt 9.
  • the veneers enter the housing 4, they are covered by the upper conveyor belt 9 and pressed flat due to its own weight on the lower conveyor belt 9.
  • An exhaust air duct that is to say the introduction of drying air before heating in the heat exchangers from one of the drying zones 5, 6, 7 into another, takes place optionally via flaps and pipelines, for example, in order to regulate the (absolute) humidity of the air and so on to allow the setting of certain drying air temperatures.
  • the veneers In the first drying zone 5, the veneers, with the exception of the deflections around the guide rollers 12, guided substantially straight between the conveyor belts 9, with a slight wave motion results from the support by support rollers 21.
  • This guide causes the veneers are subjected to only a slight pressure that does not damage their surfaces. Temperature and humidity of the drying air are adjusted so that the surfaces of the veneers are largely dried. This drying is possible because of the vertical flow to the veneers with high performance. As a result, discolorations and the so-called shuttering (shrinkage of the surface, which is hindered by the still humid interior and thus leads to tensions and cracks in the surface) of the veneers are avoided.
  • the drying takes place, in particular the guidance of the conveyor belts 9 and the drying air, similar to the first drying zone 5. However, the temperature and humidity of the drying air are adjusted so that the moisture content of the veneers at the beginning of the third drying zone 7 in about corresponds to the fiber saturation point.
  • the conveyor belts 9 are looped around the ironing rollers 13 so that the veneers are subjected to flexing work.
  • the associated fan 20 sucks drying air from the corresponding field 3 and presses them through the associated channels for distributing and the heat exchanger transversely to the transport direction and along the ironing rollers 13 over the veneers. It creates a so-called cross flow. In this way, the drying air is mainly recycled here.
  • the temperature and humidity of the drying air are adjusted so that on the one hand elastic veneers are obtained and on the other hand the desired final moisture content of the veneers of 10 to 14% is achieved.
  • Temperature and humidity are different from drying zone to drying zone and depending on the type of wood, the initial moisture content of the veneers and the amount and thickness of the veneers.
  • the speed of the conveyor belts 9, the number of revolutions of the fans 20, the amount of heating means and the quantities of exhaust air and the exhaust air duct are regulated accordingly.
  • automation means are provided.
  • fans 20 of different power are used.
  • the cooling belts 16 are driven and looped around the smooth rollers 17, that the veneers are subjected to a flexing work. At the same time, the veneers are cooled as quickly as possible in order to increase the smoothness and flatness of the veneers fix.
  • the associated fan 20 draws cooling air from the environment and pushes them through the associated channels for distribution transversely to the transport direction and along to the smoothing rollers 17 on the veneers, which are cooled to a certain temperature. It creates the so-called cross flow. The cooling air is then directed into the environment.
  • the speed of the cooling belts 16 corresponds to the speed of the conveyor belts 9.
  • FIG. 2 Another embodiment according to Figure 2 differs from the above beschrier surrounded by the execution of the second drying zone 6, in which the means for inflating treatment gas are carried out without nozzle boxes;
  • the conveyor belts 9 are deflected four times around guide rollers 12 in the second drying zone 6, so that the conveyor belts 9 form five superimposed floors and here results in a correspondingly longer residence time compared to the first embodiment.
  • the second drying zone 6 is moved with the cross flow, that is, in each field 3 of the second drying stage 6 of the associated fan 20 sucks drying air from the corresponding field 3 and through the associated channels for distributing and the heat exchanger transverse to the transport direction over the Veneers presses.
  • the operation is as described for the first embodiment.
  • the ironing rollers 13 are mounted in three substantially horizontal planes, wherein the conveyor belts 9 successively wrap the ironing rollers 13 of a plane and then guided into the next level.
  • the ironing rollers of the middle level have a smaller diameter than the other ironing rollers 13.

Landscapes

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

Abstract

Les séchoirs à placages connus présentent, dans toutes les zones de séchage et dans un dispositif de refroidissement, des caissons de buses servant à diriger un fluide de traitement sur les placages. De ce fait, ces séchoirs à placages sont coûteux à fabriquer. L'objectif de cette invention est de pallier à ce problème. A cet effet, le dispositif de refroidissement (2) et/ou au moins une des zones de séchage (5, 6, 7) sont exempts de caissons de buses (14). Etonnamment, il n'en résulte aucune perte de puissance et/ou de qualité.
PCT/EP2006/000932 2005-03-03 2006-02-03 Sechoirs a placages WO2006092198A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510010321 DE102005010321A1 (de) 2005-03-03 2005-03-03 Furniertrockner
DE102005010321.9 2005-03-03

Publications (1)

Publication Number Publication Date
WO2006092198A1 true WO2006092198A1 (fr) 2006-09-08

Family

ID=36128280

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/000932 WO2006092198A1 (fr) 2005-03-03 2006-02-03 Sechoirs a placages

Country Status (2)

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DE (1) DE102005010321A1 (fr)
WO (1) WO2006092198A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102211341A (zh) * 2011-04-21 2011-10-12 隋秀海 干燥段和冷却段网带独立的网带式薄木干燥机
DE102014107728A1 (de) * 2014-06-02 2015-12-03 Ralf Pollmeier Furniertrocknungsverfahren

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1511400A (en) * 1920-01-03 1924-10-14 Daly Alexander Lysaght Process and apparatus for drying veneer
US3418727A (en) * 1964-09-21 1968-12-31 Coe Mfg Co Veneer dryer
US3503140A (en) * 1966-01-12 1970-03-31 Robert Hildebrand Drier for sheet materials
DE1729208A1 (de) * 1967-03-04 1971-06-09 Robert Hildebrand Maschb Gmbh Trockner,insbesondere Furniertrockner
US4308667A (en) * 1977-04-12 1982-01-05 Babcock-Bsh Aktiengesellschaft Continuously operating multistage drying installation and a process for continuously drying a workpiece
DE3049457A1 (de) * 1980-12-30 1982-07-29 Willy Dipl.-Ing. 4040 Neuss Heckers Bespannungsmittelfreie trockenpartie
EP0192207A2 (fr) * 1985-02-19 1986-08-27 BABCOCK-BSH AKTIENGESELLSCHAFT vormals Büttner-Schilde-Haas AG Séchoir pour bois de placage
US4654981A (en) * 1984-02-17 1987-04-07 Babcock-Bsh Aktiengesellschaft Drying apparatus for sliced veneer
US6581300B1 (en) * 1999-03-11 2003-06-24 Babcock-Bsh Gmbh Method for drying veneer and corresponding drying device
DE10349401B3 (de) * 2003-10-21 2004-07-29 Grenzebach Bsh Gmbh Furniertrockner

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3896559A (en) * 1973-03-28 1975-07-29 Martin Jean Marie Michel Machine for drying by contact veneers obtained by peeling or slicing wood

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1511400A (en) * 1920-01-03 1924-10-14 Daly Alexander Lysaght Process and apparatus for drying veneer
US3418727A (en) * 1964-09-21 1968-12-31 Coe Mfg Co Veneer dryer
US3503140A (en) * 1966-01-12 1970-03-31 Robert Hildebrand Drier for sheet materials
DE1729208A1 (de) * 1967-03-04 1971-06-09 Robert Hildebrand Maschb Gmbh Trockner,insbesondere Furniertrockner
US4308667A (en) * 1977-04-12 1982-01-05 Babcock-Bsh Aktiengesellschaft Continuously operating multistage drying installation and a process for continuously drying a workpiece
DE3049457A1 (de) * 1980-12-30 1982-07-29 Willy Dipl.-Ing. 4040 Neuss Heckers Bespannungsmittelfreie trockenpartie
US4654981A (en) * 1984-02-17 1987-04-07 Babcock-Bsh Aktiengesellschaft Drying apparatus for sliced veneer
EP0192207A2 (fr) * 1985-02-19 1986-08-27 BABCOCK-BSH AKTIENGESELLSCHAFT vormals Büttner-Schilde-Haas AG Séchoir pour bois de placage
US6581300B1 (en) * 1999-03-11 2003-06-24 Babcock-Bsh Gmbh Method for drying veneer and corresponding drying device
DE10349401B3 (de) * 2003-10-21 2004-07-29 Grenzebach Bsh Gmbh Furniertrockner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102211341A (zh) * 2011-04-21 2011-10-12 隋秀海 干燥段和冷却段网带独立的网带式薄木干燥机
DE102014107728A1 (de) * 2014-06-02 2015-12-03 Ralf Pollmeier Furniertrocknungsverfahren

Also Published As

Publication number Publication date
DE102005010321A1 (de) 2006-09-14

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