WO2005047793A1 - Furniertrockner - Google Patents
Furniertrockner Download PDFInfo
- Publication number
- WO2005047793A1 WO2005047793A1 PCT/EP2004/008968 EP2004008968W WO2005047793A1 WO 2005047793 A1 WO2005047793 A1 WO 2005047793A1 EP 2004008968 W EP2004008968 W EP 2004008968W WO 2005047793 A1 WO2005047793 A1 WO 2005047793A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- drying
- dryer
- veneers
- conveyor belts
- zones
- Prior art date
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
-
- 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
-
- 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
-
- 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 dryer for sliced veneers according to the preamble of claim 1.
- Sliced veneers tend to deform when drying due to different degrees of shrinkage.
- the result is wavy veneers that may have cracks and / or pressure marks.
- the veneers must be dried in several drying zones arranged one behind the other, each with optimally adjusted parameters such as temperature, humidity of the drying medium and effective pressure on the veneers.
- the pressure acting on the veneers must be varied such that the wet veneers are initially exposed to low pressure and the dried veneers are smoothed using pressure. This is why a straight line of conveyor belts is followed by a so-called ironing section, in which the veneers are deflected in many ways and are thus exposed to increased pressure.
- a dryer for sliced veneers is known from EP 192 207 B1, in which the veneers between two conveyor belts are first dried in a part with a straight guide and then in a part with a loop-like guide of the conveyor belts.
- the dryer is subdivided into fields that can form drying zones individually or in combination with the required drying climate.
- the fields are arranged one behind the other in a horizontal plane.
- US Pat. No. 6,108,942 describes a dryer for sliced veneers, in which the guidance of two conveyor belts forms a straight and a curved drying path, each of the paths being able to be arranged in a plurality of horizontal planes to be traversed one behind the other. Drying zones can be arranged one behind the other in a horizontal plane.
- the known dryers for sliced veneers have the disadvantage that the individual drying zones cannot be clearly separated. This lack of separability is particularly critical when exhaust air is introduced from, for example, a first drying zone into a second. A backflow of drying medium from the second into the first drying zone can always be observed, that is to say a mixing of the drying parameters. Practice has shown that temperature differences of up to 30 ° C can be maintained between the individual drying zones; a desired moisture content of the drying medium can be correspondingly inaccurate and adjust the veneers in the individual zones of the dryer. This leads to the fact that the veneers are not of optimal quality and, for example, show pressure marks due to the bands, cracks and / or waviness.
- deflection or deflection means that the conveyor belts are guided after the deflection in such a way that the general direction of transport, i.e. without taking into account loop and / or wave-shaped guidance, comes from one end of the dryer by approximately 180 ° to the same end changes.
- the transport levels are parallel or almost parallel.
- the object of the invention is to provide a dryer for sliced veneers, in which the drying parameters can be selectively adjusted over wide areas in the drying zones and thus veneers with optimal quality can be produced.
- the object is achieved by the characterizing features of claim 1.
- the arrangement of the drying zones on top of one another in horizontal planes prevents significant amounts of drying medium from passing from one drying zone into an adjacent drying zone without additional sealing effort. This means that an optimal drying climate can be set in each individual drying zone depending on the type of wood, without influencing the adjacent drying zones.
- the conveyor belts are redirected at least during the transition from one of the drying zones to the next one, so that the general direction of transport changes during the transition from one to the next drying zone.
- the conveyor belts are shorter overall than when the drying zones are arranged on one level, because the return to the dryer entrance takes place over a considerably shorter distance. Another advantage is that the drying zones arranged one above the other save space for the installation of the dryer.
- the spatial separation of the deflection rollers, which are arranged in the transition from one of the drying zones to the next, from the drying zones according to claim 2 enables an even better partitioning between the drying zones and a simpler construction of the deflection.
- the additional deflection of the conveyor belts in one of the drying zones according to claim 3 extends the distance in this drying zone with comparatively little effort and thus increases the performance of the dryer.
- the extension of the straight course of the conveyor belts to at least part of the second drying zone according to claim 4 means that a first deflection of the conveyor belts and thus an increased pressure on the veneers only takes place when the surfaces of the veneers have already largely dried. This reliably prevents the pattern of the conveyor belts from being pressed into the surfaces and thus being visible.
- the subdivision of the conveyor belt according to claim 5 makes it possible to decouple the pressure acting on the veneers by the conveyor belts in the ironing section from the pressure in the rest of the dryer. The pressure in the ironing section can therefore be optimally adjusted.
- Three drying zones according to claim 6 allow an optimal adaptation of the drying conditions to the needs.
- the pretensioning of the conveyor belts can be low without them sagging inadmissibly. This further reduces the pressure on the veneers in this section.
- a sensor according to claim 8, in conjunction with an evaluation and control device, allows the drying to be optimally adapted to different qualities of the veneers.
- FIG. 9 shows a longitudinal section through a dryer
- Figure 2 shows a cross section through a dryer along the line AB
- Figure 3 shows a cross section through a dryer of another embodiment.
- a housing 1 encloses a drying room which comprises three drying zones 2, 3, 4.
- the drying zones 2, 3, 4 are arranged one above the other in horizontal planes and separated from one another by floors 11.
- a dryer inlet 5 which is arranged at the bottom left according to FIG. 1
- two endless conveyor belts 6 are guided parallel and at a short distance from one another or touching one after the other through the drying zones 2, 3, 4 to a dryer outlet 7 which is located at an opposite end of the dryer inlet 5
- Side of the drying room is arranged.
- the direction of transport is illustrated by arrows 8.
- the lower conveyor belt 6 is guided so that it protrudes a short distance from the dryer.
- the conveyor belts 6 are equipped with a controllable drive system and are returned individually from the dryer outlet 7 via rollers and a tensioning device to the dryer inlet 5.
- the conveyor belts 6 are guided in the form of flat waves, that is to say approximately in a straight line in one plane.
- support rollers 9 are arranged spaced apart in the transport direction, only a part of which is shown. The longitudinal axes of the support rollers 9 are aligned horizontally and perpendicularly to the transport direction.
- the conveyor belts 6 are guided over the support rollers 9.
- the conveyor belts 6 are deflected into the second drying zone 3 via three deflecting rollers 10 in such a way that the general direction of transport is changed by 180 °.
- the lower boundary of the lower deflecting roller 10 and the upper boundary of the upper deflecting roller 10 are in an approximately central plane of the corresponding drying zone 2, 3.
- the ironing section begins in the second half of the second drying zone 3.
- a multiplicity of rollers 12 spaced apart in a horizontal plane are arranged, their longitudinal axes being aligned at right angles to the direction of transport.
- the center distance of two of the rollers 12 corresponds approximately to three times the radius of one of the rollers 12.
- the conveyor belts 6 are alternately guided in a loop above and below the rollers 12.
- the conveyor belts 6 are guided from the last roller 12 below via a further deflecting roller 10 to a first of a plurality of rollers 13 of the third drying stage 4 and are thus deflected by 180 °.
- the rollers 13 of the third drying stage 4 are arranged in a horizontal plane, the longitudinal axes being oriented at right angles to the direction of transport.
- the rollers 13 have the same diameter as the rollers 12 of the second drying stage 3.
- the center distance of the rollers 13 is approximately three times their radius.
- Each drying zone 2, 3, 4 is assigned means for inflating drying medium onto the veneers.
- the drying medium is usually air that is circulated.
- the means for inflating comprise for each drying zone 2, 3, 4 at least one fan, here a radial fan 14 with a controllable drive, at least one heat exchanger 15 with a controllable supply of heating medium, a large number of nozzle boxes 16 in a known arrangement, of which only a part in FIG. 1 is shown, an exhaust air line 17 with control valve and various channels for collecting and distributing drying medium.
- the radial fan 14 is fastened to a horizontal part of the housing 1 with a vertical drive axis.
- a sensor 18 for determining the moisture of the undried veneers is arranged in an area in front of the dryer inlet 5.
- the sensor 18 is connected to a corresponding evaluation unit.
- a drying device for sliced veneers includes devices, not shown, such as a feed device which transfers the veneers to the lower conveyor belt 6 at the transfer point, a cooler for the veneers and a discharge device.
- the ironing section is always in the second drying zone 3, while the rectilinear part of the conveyor belts 6 is arranged in the first drying zone 2 and possibly in a part of the second drying zone 3.
- the conveyor belts 6 can be deflected by 180 ° within one or more of the drying zones 2, 3, 4 in order to extend the transport distance and thus the time of stay of the veneers within the corresponding drying zone 2, 3, 4.
- the deflection of the conveyor belts 6 into the next drying zone 3, 4 or the discharge of the veneers then takes place on the same side of the drying room as the entry into the corresponding drying zone 2, 3, 4.
- each deflection of the conveyor belts 6 from one drying zone 2, 3 into the next one can be arranged outside the corresponding drying zones 2, 3, 4.
- the deflections are separated from drying zones 2, 3, 4 by, for example, metal sheets.
- the conveyor belt 6, which is arranged at the top in the ironing section is divided into two.
- the upper conveyor belt 6 in the ironing section is designed such that it exerts a higher pressure on the veneers than in the rest of the dryer. This can be achieved, for example, by a higher pretension and / or a particularly large basis weight of this conveyor belt 6.
- FIG. 3 differs in the following features from the example according to FIGS. 1 and 2:
- the radial fans 14 are arranged with a horizontal axis of rotation and all on only one side of the housing 1.
- the housing 1 can be cuboid-shaped for the entire dryer, without indentations and / or bulges.
- the veneers which are cut in sheet form from a block of wood with a thickness of, for example, 0.2 to 4.0 mm, are placed on the lower conveyor belt 6 at this point by the feed device shortly before the dryer inlet 5.
- the veneers lie largely flat on the conveyor belt 6.
- their moisture ie the amount of water per amount of dry wood, is measured.
- the veneers are covered by the upper conveyor belt 6 and pressed flat against the lower conveyor belt 6 due to its own weight.
- An exhaust air guide that is, the introduction of drying air before heating in the heat exchangers 15 from one of the drying zones 2, 3, 4 into another, takes place via flaps 19 in the trays 1 into one or the next Drying zones 3, 4, in order to increase the (absolute) humidity of the air and thus to allow the setting of higher drying air temperatures.
- the veneers are guided essentially in a straight line, the slight wave movement resulting from the support by the support rollers 9. This guiding means that the veneers are only exposed to a slight pressure that does not damage their surfaces.
- the temperature and humidity of the drying air are set so that the surfaces of the veneers are largely dried. This prevents discolouration and the so-called cladding (shrinking of the surface, which is hampered by the still damp interior and thus leads to tension and cracks in the surface) of the veneers.
- the veneers are directed upwards into the second drying zone 3, the general direction of transport changing by 180 °.
- the veneers are first guided in a substantially straight line and then in a loop around the rollers 12.
- the veneers run between the rollers 12 in a straight line, the length of which corresponds at least to the diameter of the rollers 12.
- the temperature and humidity of the drying air are set so that the moisture of the veneers at the beginning of the ironing section, that is to say approximately in the middle of the second drying zone 3, is at least 30%.
- the veneers are guided upwards into the third drying zone 4, the direction of transport again changing by 180 °.
- the ironing section continues with the loop-shaped guide.
- the temperature and humidity of the drying air are set so that lignin bridges in the wood are plasticized on the one hand and elastic veneers are obtained and on the other hand the desired final moisture content of the veneers is achieved.
- the temperature and humidity vary from drying zone to drying zone and depend on the type of wood, the initial moisture of the veneers and the amount of veneers.
- the speed of the conveyor belts, the speed of the fans, the amount of heating medium as well as the amount of exhaust air and the exhaust air routing are regulated accordingly. Automation means are provided for this.
- the veneers After drying, the veneers are cooled and stacked in the known manner.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006535956A JP2007509306A (ja) | 2003-10-21 | 2004-08-11 | ベニヤ単板乾燥機 |
CA002542838A CA2542838A1 (en) | 2003-10-21 | 2004-08-11 | Veneer dryer |
BRPI0415659-5A BRPI0415659A (pt) | 2003-10-21 | 2004-08-11 | secador para folheado |
EP04741402A EP1678452A1 (de) | 2003-10-21 | 2004-08-11 | Furniertrockner |
US10/576,504 US20070130787A1 (en) | 2003-10-21 | 2004-08-11 | Veneer dryer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10349401A DE10349401B3 (de) | 2003-10-21 | 2003-10-21 | Furniertrockner |
DE10349401.4 | 2003-10-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005047793A1 true WO2005047793A1 (de) | 2005-05-26 |
Family
ID=32603270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/008968 WO2005047793A1 (de) | 2003-10-21 | 2004-08-11 | Furniertrockner |
Country Status (9)
Country | Link |
---|---|
US (1) | US20070130787A1 (de) |
EP (1) | EP1678452A1 (de) |
JP (1) | JP2007509306A (de) |
KR (1) | KR20060061861A (de) |
BR (1) | BRPI0415659A (de) |
CA (1) | CA2542838A1 (de) |
DE (1) | DE10349401B3 (de) |
TW (1) | TWI265265B (de) |
WO (1) | WO2005047793A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022017649A1 (de) | 2020-07-23 | 2022-01-27 | Grenzebach Bsh Gmbh | Trockner zum trocknen von furnierplatten |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005010321A1 (de) * | 2005-03-03 | 2006-09-14 | Grenzebach Bsh Gmbh | Furniertrockner |
FI119153B (fi) | 2006-11-14 | 2008-08-15 | Metso Paper Inc | Ilmakuivaimen päätyosa, ilmakuivain, menetelmä ilmakuivaimen päätyosassa ja puhaltimen käyttö |
WO2011079867A1 (de) * | 2009-12-30 | 2011-07-07 | Benninger Zell Gmbh | Vorrichtung und verfahren zur wärmebehandlung von kontinuierlich geförderten flächengebilden |
US8959792B2 (en) * | 2012-09-28 | 2015-02-24 | Ricoh Company, Ltd. | Dryers that adjust power based on non-linear profiles |
CN103486837B (zh) * | 2013-09-27 | 2015-06-10 | 江苏晟宇地板有限公司 | 木材单板烘干装置 |
DE102014107728A1 (de) * | 2014-06-02 | 2015-12-03 | Ralf Pollmeier | Furniertrocknungsverfahren |
CN106546084B (zh) * | 2016-12-11 | 2018-12-11 | 沈群香 | 一种用于稀土废料回收的稀土脱水干燥设备 |
CN107192238A (zh) * | 2017-07-10 | 2017-09-22 | 苏州市丹纺纺织研发有限公司 | 一种染布机的烘干装置 |
CN108088213A (zh) * | 2017-12-18 | 2018-05-29 | 梁灿升 | 木片烘干方法、木片烘干机及木片输送机组 |
DE102018002107A1 (de) * | 2018-03-15 | 2019-09-19 | Grenzebach Bsh Gmbh | Verfahren und Vorrichtung zum Trocknen von Gipsplatten |
CN113008007A (zh) * | 2019-12-21 | 2021-06-22 | 芜湖瑞泰汽车零部件有限公司 | 一种汽车地毯生产用无纺布烘干装置 |
CN111238206A (zh) * | 2020-02-25 | 2020-06-05 | 中国农业大学 | 牛床再生垫料热风干燥生产装置及方法 |
JP2022175840A (ja) * | 2021-05-14 | 2022-11-25 | 株式会社伊東電機工作所 | 加熱乾燥装置の通紙機構 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE512329C (de) * | 1928-03-03 | 1930-11-10 | Fritz Haas | Trockenvorrichtungen mit in Abteilen uebereinanderliegenden Foerderbaendern |
US3308556A (en) * | 1964-10-19 | 1967-03-14 | Proctor & Schwartz Inc | Material treating apparatus |
EP0192207A2 (de) * | 1985-02-19 | 1986-08-27 | BABCOCK-BSH AKTIENGESELLSCHAFT vormals Büttner-Schilde-Haas AG | Furniertrockner für Messerfurniere |
US5537758A (en) * | 1993-06-30 | 1996-07-23 | Baggio Tecnologie Srl | Drier for the continuous drying and conditioning treatment of hides fabrics |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2716086B2 (de) * | 1977-04-12 | 1980-06-04 | Babcock-Bsh Ag Vormals Buettner- Schilde-Haas Ag, 4150 Krefeld | Durchlauftrockner für bahn- oder blattförmiges Gut |
NL8303994A (nl) * | 1983-11-10 | 1985-06-03 | Nedap Nv | Strooiveldarme lektransformator. |
US6108942A (en) * | 1998-07-20 | 2000-08-29 | Fezer S.A. Industrias Mecanicas | Opposed belt drying apparatus for sliced wood veneers |
-
2003
- 2003-10-21 DE DE10349401A patent/DE10349401B3/de not_active Expired - Fee Related
-
2004
- 2004-08-11 US US10/576,504 patent/US20070130787A1/en not_active Abandoned
- 2004-08-11 WO PCT/EP2004/008968 patent/WO2005047793A1/de active Application Filing
- 2004-08-11 JP JP2006535956A patent/JP2007509306A/ja active Pending
- 2004-08-11 KR KR1020067007492A patent/KR20060061861A/ko not_active Application Discontinuation
- 2004-08-11 CA CA002542838A patent/CA2542838A1/en not_active Abandoned
- 2004-08-11 BR BRPI0415659-5A patent/BRPI0415659A/pt not_active IP Right Cessation
- 2004-08-11 EP EP04741402A patent/EP1678452A1/de not_active Withdrawn
- 2004-08-18 TW TW093124773A patent/TWI265265B/zh not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE512329C (de) * | 1928-03-03 | 1930-11-10 | Fritz Haas | Trockenvorrichtungen mit in Abteilen uebereinanderliegenden Foerderbaendern |
US3308556A (en) * | 1964-10-19 | 1967-03-14 | Proctor & Schwartz Inc | Material treating apparatus |
EP0192207A2 (de) * | 1985-02-19 | 1986-08-27 | BABCOCK-BSH AKTIENGESELLSCHAFT vormals Büttner-Schilde-Haas AG | Furniertrockner für Messerfurniere |
EP0192207B1 (de) | 1985-02-19 | 1988-06-01 | BABCOCK-BSH AKTIENGESELLSCHAFT vormals Büttner-Schilde-Haas AG | Furniertrockner für Messerfurniere |
US5537758A (en) * | 1993-06-30 | 1996-07-23 | Baggio Tecnologie Srl | Drier for the continuous drying and conditioning treatment of hides fabrics |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022017649A1 (de) | 2020-07-23 | 2022-01-27 | Grenzebach Bsh Gmbh | Trockner zum trocknen von furnierplatten |
DE102020004455A1 (de) | 2020-07-23 | 2022-01-27 | Grenzebach Bsh Gmbh | Trockner zum Trocknen von Furnierplatten |
Also Published As
Publication number | Publication date |
---|---|
TW200514956A (en) | 2005-05-01 |
BRPI0415659A (pt) | 2006-12-19 |
JP2007509306A (ja) | 2007-04-12 |
CA2542838A1 (en) | 2005-05-26 |
US20070130787A1 (en) | 2007-06-14 |
EP1678452A1 (de) | 2006-07-12 |
TWI265265B (en) | 2006-11-01 |
KR20060061861A (ko) | 2006-06-08 |
DE10349401B3 (de) | 2004-07-29 |
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