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EP1161647B1 - Method for drying veneer and corresponding drying device - Google Patents

Method for drying veneer and corresponding drying device Download PDF

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Publication number
EP1161647B1
EP1161647B1 EP00909220A EP00909220A EP1161647B1 EP 1161647 B1 EP1161647 B1 EP 1161647B1 EP 00909220 A EP00909220 A EP 00909220A EP 00909220 A EP00909220 A EP 00909220A EP 1161647 B1 EP1161647 B1 EP 1161647B1
Authority
EP
European Patent Office
Prior art keywords
veneers
drying
belts
optionally
transport
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
EP00909220A
Other languages
German (de)
French (fr)
Other versions
EP1161647A1 (en
Inventor
Ingo Grebe
Helmut WÜNSCHE
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
Grenzebach BSH GmbH
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Publication date
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Publication of EP1161647A1 publication Critical patent/EP1161647A1/en
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Classifications

    • 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
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/003—Handling, e.g. loading or unloading arrangements for articles
    • F26B25/004—Handling, e.g. loading or unloading arrangements for articles in the shape of discrete sheets
    • 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 method for drying veneers, in particular Sliced veneers, according to the preamble of claim 1 and one Drying device for performing the method according to the preamble of Claim 4.
  • a feed device and a discharge device, each with a suction box are known from DE 25 23 482 A1.
  • the applicant is also known to: a feed device with a combination of suction box and transport system Belt and with a discharge device, a transport system with belts to install.
  • a dryer is understood to be a so-called ironing dryer.
  • two conveyor belts - a carrier belt and a shroud - that are lying directly on top of each other in parallel and between which the veneers be transported through the dryer, at least on a not insignificant Part of the transport route with multiple deflections so that the veneers alternately bent up and down.
  • the redirection can be achieved in different ways. Or on the upper conveyor belt pressure is applied with rollers.
  • EP 0 152 576 B2 describes a dryer of the generic type in which the Belt guide after a straight section with loops around rollers relatively large diameter, one between two adjacent rollers short piece is straight.
  • EP 0 290 056 A2 describes a generic dryer with a sinusoidal shape Belt guide that is achieved by many small diameter rollers. Additional rod-shaped rollers can be attached in addition to the rollers.
  • DE 41 09 298 C2 is a line design corresponding to a flat omega of the conveyor belts described in the case of at least a plurality of rollers the second and fourth rollers in the direction of the dryer inlet of the first and third are removed, the second and third rollers in one plane lie above the level of the first and fourth rollers and the distance between the two Levels is smaller than the diameter of a roller.
  • DE 42 17 493 A1 describes a zigzag-like tape guide which is offset by deflecting rollers lying one above the other is achieved.
  • the conveyor belts in the cooler are routed similarly to those in the dryer.
  • the aim of the iron dryer is to get the veneers through while drying and cooling Smoothen smoothing. Compared to dryers and coolers with a straight belt guide Without pressure, most types of wood have a significantly better smoothing reached. But with sensitive types of wood such as Beech, nut and cherry tree can Wrinkles and cracks appear that affect the veneer at least partially to make something useless.
  • the committee here is 10 to 20%.
  • the inventors set themselves the task, even for wood types that are difficult to dry to develop a process for drying veneers that is flawless Smooth veneers are obtained and the rejects are caused by folds and tears is minimized.
  • Another object is to carry out a drying device to create a method according to the invention.
  • the first object is solved by the features of claim 1.
  • the inclined position of the veneers in the dryer and in the cooler makes one component the flexing work in the deflection points also in the direction of the fibers. It has shown that all dried veneers largely without the dryer. Folds and Cracks leave when the grain of the veneers through during transportation the dryer and the cooler diagonally to the transport direction is instead of usual as before at right angles.
  • Claim 4 solves the second problem.
  • Claims 2 and 3 facilitate the manual work of the operating personnel.
  • the sub-claims 5 to 10 contain preferred embodiments of the invention Drying apparatus. The features ensure a safe Operation of the drying device.
  • the slant is the angle between the grain of the veneer and one Line perpendicular to the direction of transport is placed on the veneer when the veneers are placed Dryer specifically with the intended angle of 20 ° to 60 °, preferably 30 ° to 50 °, brought about.
  • the speeds of the veneers in the feed direction are in the feed device so differently adjusted right and left that the transfer of the veneers on the conveyor belt, which is the lower conveyor belt of the dryer, in the correct one Inclined.
  • the veneers are in during drying and cooling fixed this position because it is mechanically held between the conveyor belts are.
  • the discharge device makes the inclination through different Speeds that correspond to those in the feeder, largely reversed to facilitate further handling. The operating staff therefore does not have to get used to changing processes or handling.
  • a preferred embodiment is the use of different diameters of the driven ones Pulleys according to claim 6.
  • a braking device according to claim 8 is easy to retrofit in existing systems.
  • Claims 9 and 10 show preferred embodiments of the braking device.
  • a drying device consists of a feed device 1, a dryer 2, a cooler 3 and a discharge device 4.
  • Each of the individual devices of the drying device has its own transport system. The speed of the individual transport systems is on top of each other coordinated and depends on the drying process.
  • the feed device 1 shown as a detail in FIGS. 2 to 4 is for the semi-automatic one Feed the wet veneers.
  • a suction box 6 On a rack 5 are a suction box 6 and a transport system with belts 10, 16 arranged in parallel, 19, 24 attached.
  • the straps 10, 16, 19, 24 are arranged side by side and each over two spaced pulleys or over a pulley and led a spaced redirection.
  • the pulleys are on shafts attached.
  • the arrow 32 indicates the direction of transport.
  • the suction box 6 consists of a cuboid sheet metal construction with perforated Sheet 7 on the underside and with at least one suction pipe 8 with a fan 9, which is arranged on the suction box.
  • the suction box 6 extends over the entire width of the transport plane and is horizontal while in its longitudinal direction it is slightly inclined in the direction of transport.
  • the transport system of the feed device 1 consists of an upper and a Under belt system.
  • the upper belt system is divided into two. In the area of the suction box 6 there are endless ones Belt 10 with a flat, rectangular cross section. You are below the Suction box along the perforated plate 7 up to the pulleys 11 on the drivable shaft 12 which is parallel to and spaced from the rear lower Longitudinal edge of the suction box 6 is mounted, and back through the suction box 6 and around the deflection 13 in front of the front lower longitudinal edge of the suction box 6 perforated sheet 7 out. The shaft 12 and the deflection 13 are spaced apart in parallel stored. All pulleys 11 have the same diameter.
  • the second area of the upper belt system begins at the drivable shaft 14, the is mounted parallel to the shaft 12 between the suction box 6 and the shaft 12, and leads to the carrier belt 15 of the dryer 2.
  • the endless belts 16 with e.g. round Cross section are here from the pulleys 17 on the shaft 14 via a Cantilever arm of the frame 5 up to the deflection 18, which is parallel to the shaft 14, and led back to the pulleys 17.
  • the cantilever is vertical about shaft 14 pivotable so that the height of the deflection 18 is adjustable.
  • the pulleys 17 have different diameters so graded that a linear velocity distribution seen from the left to the right in the direction of transport.
  • the Deviating from the horizontal, shaft 14 is so inclined that the lower edges the belt 16 mounted on the pulleys 17 with the perforated Plate 7 are aligned.
  • the pulleys 17 and the deflection 18 point to their peripheral areas e.g. semicircular recesses in which the straps 16 are led.
  • the lower belt system is located below the upper belt system.
  • the belt system is divided into two parts. In the front area, the - in the direction of transport seen - starts below the last third of the suction box 6 and in the area ends below the shaft 12, all belts 19 are at the same speed driven.
  • the endless belts 19 with a flat, rectangular cross section are via the pulleys 20 on the shaft 21 and the pulleys 22 on the driven shaft 23 out.
  • the pulleys assigned to a shaft 21, 23 20, 22 each have the same diameter.
  • In the second area there are endless ones Belt 24 a e.g.
  • the pulleys 25 have different diameters and show like that Deflection 27 on their peripheral surfaces recesses that are about the Cross section of the belt 24 correspond and in which the belt 24 are guided.
  • the Deviating from the horizontal, shaft 26 is so inclined that the upper edges the belt 24 guided on the pulleys 25 with the transport surface aligned.
  • the pulleys 11, 17, 20, 22, 25 are each fixed to the associated shaft 12, 14, 21, 23, 26 connected.
  • the diameters of the pulleys 17, 25 of different sizes are thus one on the other matched that the speed of the belts 16, 24 continuously from - in Transport direction seen - decreases left to right or vice versa and thus also the transport speed of the veneers 31.
  • the belts 10, 16, 19, 24 are connected via a drive system with e.g. Gear motor 29 and chain drive 30 drivable.
  • the operating staff lifts a veneer 31 in such a way that at least one part gets into the suction area of the suction box 6 and then completely against it perforated sheet 7 and the belt 10 is pressed.
  • the belts 10 of the feeder 1 convey the veneer 31 along the perforated plate 7 in the direction Dryer 2.
  • the veneer 31 becomes due to the difference in speed the belt 16, 24 placed in a desired inclined position.
  • the required speed difference can be easily from the transport route between the shaft 26 and the deflection 27 and the angle of the inclined position calculate.
  • FIGS. 5 and 6 Another embodiment of the invention according to claim 6 is in FIGS. 5 and 6 shown.
  • the structure corresponds to the previous description with the difference that the different speeds of the belts 16, 24, which are also flat belts can be achieved by individual drives 34, 36:
  • the shaft 12 can be driven together with the shaft 23 of the lower belt system.
  • the Pulleys 33 all of the same size, are between the shaft 12 and the Suction box 6 stored individually.
  • the axis of rotation of the pulleys 33 is parallel to Shaft 12.
  • Each pulley 33 has its own controllable drive 34.
  • the pulleys 35 are the same size, are individually stored and each have an adjustable drive 36.
  • the speeds of the drives 34, 36 are adjusted so that the Speed of the belts 16, 24 linearly from left to right or vice versa decreases and the desired inclined position of the veneer 31 is reached, wherein in The transport speed dependent on the process is observed.
  • the invention also includes all other arrangements and drive options that allow different belt speeds.
  • FIG. 7 Another embodiment of the invention according to claim 9 is shown in Figure 7.
  • the Structure corresponds to that of Figures 2 to 4 with the differences that the pulleys 17, 25 have the same diameter and that a braking device is installed is.
  • a braking device is off-center in approximately 2/3 of the width of the feed device 1 below or above the transport plane between two adjacent belts 16, 24 arranged.
  • the braking device consists of a nozzle 37 with an internal one Suction fan 38 and an opening 39 directed towards the transport plane Opening 39 is in the immediate vicinity of the transport level. Between suction fan 38 and opening 39, a flap 40 is arranged.
  • the suction fan 38 In operation, the suction fan 38 generates a negative pressure in the nozzle 37.
  • the flap 40 is closed. The moment a veneer 31 passes the nozzle 37 opens the flap 40. As a result of the pressure drop, the veneer 31 is against the opening 39 pressed and held on one side, while the other side of the veneer 31 is transported further. After a certain time interval that depends on the transport speed and depends on the inclination to be achieved, the flap 40 closes and the nozzle 37 releases the veneer 31, which is now in the desired angle has reached. The further transport to the carrier belt 15 of the dryer 2 now takes place evenly on both sides of the veneer 31 so that its position is preserved.
  • an external vacuum source on the nozzle 37 can also be used be connected.
  • FIG. 8 Another embodiment of a braking device according to claim 10 is in Figure 8 shown.
  • a drivable disc 41 is less below the transport path Distance between two adjacent belts 16, 24 off-center in about 2/3 of the Width of the feed device 1 arranged.
  • the upper tangent of disc 41 is aligned with the transport path, the axis of rotation is perpendicular to the transport direction.
  • Above the disk 41 is a rotatably mounted disk 42 on a punch 43 attached.
  • the axis of rotation of the disk 42 is perpendicular to and parallel to the axis of rotation the disc 41.
  • the punch 43 can be driven up and down, e.g. about pneumatics or electromagnet.
  • the disk 41 is constantly over e.g. a gear motor 44 slowly driven.
  • the direction of rotation of the disk 41 corresponds to the direction of transport, the peripheral speed is much slower than the transport speed of the Belt system.
  • the Stamp 43 so that the disc 42 presses the veneer 31 against the disc 41. Due to the low peripheral speed of the disk 41, the veneer 31 braked on one side and thus warped into an inclined position. Once the required Oblique position is reached, the punch 43 retracts and releases the veneer 31, so that it is transported to the carrying belt 15 in the inclined position provided.
  • a discharge device 4 according to claim 6 is shown as a detail in FIG.
  • On a frame 45 is a transport system with belts 46.
  • the round Belts are from the pulleys 48 on the driven shaft 49 via the Deflection 47 and led back.
  • the pulleys 48 have different gradations Diameter; their arrangement is such that the inclination of the veneers 31st is reversed in dryer 2 and cooler 3.
  • the shaft 49 is so oblique stored that the upper edge of the belt 46 guided on the pulleys 48 with the transport track is aligned.
  • the shaft 49 is coupled to a drive 50.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Ink Jet (AREA)

Abstract

A method and apparatus for drying veneer wherein the feeder upstream of the drying station displaces the veneer at different speeds on the right and left sides of the transport path of the veneer as seen in the direction of transport so as automatically to impart an inclined orientation of the veneer of 20° to 60° to a line perpendicular to the transport direction before the veneer reaches the drying station. In the drying station and the cooling station the veneer retains this inclined orientation and in these stations the veneer is subjected to multiple rerouting or the application of pressure.

Description

Die Erfindung betrifft ein Verfahren zum Trocknen von Furnieren, insbesondere von Messerfurnieren, gemäß dem Oberbegriff des Anspruchs 1 sowie eine Trocknungsvorrichtung zur Durchführung des Verfahrens gemäß dem Oberbegriff des Anspruchs 4.The invention relates to a method for drying veneers, in particular Sliced veneers, according to the preamble of claim 1 and one Drying device for performing the method according to the preamble of Claim 4.

Es ist allgemein angewendete Praxis, die von der Messermaschine geschnittenen feuchten Furniere, das sind einzelne Furnierblätter, einem Trockner zuzuführen, das Wasser auf eine vorgegebene Restfeuchte zu verdampfen und anschließend die Furniere zu kühlen, zu zählen und zu stapeln. Hierbei werden die Furniere so dem Trockner zugeführt, daß die Faserrichtung der Furniere annähernd rechtwinklig zur Transportrichtung ist.It is common practice to cut the knife machine wet veneers, that is individual veneer sheets, to be fed to a dryer, the Evaporate water to a predetermined residual moisture and then the Cool, count and stack veneers. Here, the veneers are so Dryer supplied that the grain of the veneers is approximately perpendicular to Transport direction is.

Eine Zuführvorrichtung und eine Austragsvorrichtung mit jeweils einem Saugkasten sind aus der DE 25 23 482 A1 bekannt. Weiterhin ist der Anmelderin bekannt, bei einer Zuführvorrichtung eine Kombination aus Saugkasten und Transportsystem mit Riemen und bei einer Austragsvorrichtung ein Transportsystem mit Riemen zu installieren.A feed device and a discharge device, each with a suction box are known from DE 25 23 482 A1. The applicant is also known to: a feed device with a combination of suction box and transport system Belt and with a discharge device, a transport system with belts to install.

Unter einem Trockner wird im folgenden ein sogenannter Bügeltrockner verstanden. Hier sind entweder zwei Transportbänder - ein Tragband und ein Deckband -, die parallel unmittelbar übereinander liegend sind und zwischen welchen die Furniere durch den Trockner transportiert werden, zumindest auf einem nicht unerheblichen Teil der Transportstrecke mit vielfachen Umlenkungen so geführt, daß die Furniere wechselweise nach oben und nach unten gebogen werden. Die Umlenkung kann hierbei auf verschiedene Arten erreicht werden. Oder auf das obere Transportband wird mit Walzen Druck ausgeübt.In the following, a dryer is understood to be a so-called ironing dryer. Here are either two conveyor belts - a carrier belt and a shroud - that are lying directly on top of each other in parallel and between which the veneers be transported through the dryer, at least on a not insignificant Part of the transport route with multiple deflections so that the veneers alternately bent up and down. The redirection can can be achieved in different ways. Or on the upper conveyor belt pressure is applied with rollers.

In der EP 0 152 576 B2 ist ein gattungsgemäßer Trockner beschrieben, bei dem die Bandführung nach einem geraden Teilstück jeweils schleifenförmig um Walzen mit relativ großem Durchmesser erfolgt, wobei zwischen zwei benachbarten Walzen ein kurzes Stück geradlinig geführt ist.EP 0 152 576 B2 describes a dryer of the generic type in which the Belt guide after a straight section with loops around rollers relatively large diameter, one between two adjacent rollers short piece is straight.

Die EP 0 290 056 A2 beschreibt einen gattungsgemäßen Trockner mit einer sinusförmigen Bandführung, die durch viele Walzen mit kleinem Durchmesser erreicht wird. Zusätzliche stabförmige Rollen können ergänzend zu den Walzen angebracht sein. EP 0 290 056 A2 describes a generic dryer with a sinusoidal shape Belt guide that is achieved by many small diameter rollers. Additional rod-shaped rollers can be attached in addition to the rollers.

In der DE 41 09 298 C2 ist eine einem flachen Omega entsprechende Linienführung der Transportbänder beschrieben, bei der bei mindestens einer Vielzahl von Walzen jeweils die zweiten und die vierten Walzen in Richtung zum Trocknereingang von den ersten und dritten entfernt sind, wobei die zweiten und dritten Walzen in einer Ebene oberhalb der Ebene der ersten und vierten Walzen liegen und der Abstand der beiden Ebenen kleiner ist als der Durchmesser einer Walze.DE 41 09 298 C2 is a line design corresponding to a flat omega of the conveyor belts described in the case of at least a plurality of rollers the second and fourth rollers in the direction of the dryer inlet of the first and third are removed, the second and third rollers in one plane lie above the level of the first and fourth rollers and the distance between the two Levels is smaller than the diameter of a roller.

Die DE 42 17 493 A1 beschreibt eine zickzackartige Bandführung, die durch versetzt übereinander liegende Umlenkrollen erzielt wird.DE 42 17 493 A1 describes a zigzag-like tape guide which is offset by deflecting rollers lying one above the other is achieved.

Bei dem in der DE 37 06 353 C2 beschriebenen Trockner ist die Linienführung der Transportbänder nahezu geradlinig. Mit Hilfe von vertikal bewegbaren Druckwalzen, die in Transportrichtung versetzt und parallel zu den Tragwalzen angeordnet sind, wird ein ausreichender Druck auf die Furniere ausgeübt.In the dryer described in DE 37 06 353 C2, the lines are the Conveyor belts almost straight. With the help of vertically movable pressure rollers, which are offset in the direction of transport and are arranged parallel to the support rollers, sufficient pressure is exerted on the veneers.

Im Kühler sind die Transportbänder ähnlich geführt wie im Trockner.The conveyor belts in the cooler are routed similarly to those in the dryer.

Ziel der Bügeltrockner ist es, die Furniere während des Trocknens und Kühlens durch Walken zu glätten. Im Vergleich zu Trocknern und Kühlern mit gerader Bandführung ohne Druckwirkung wird bei den meisten Holzarten eine erheblich bessere Glättung erreicht. Aber bei empfindlichen Holzarten wie z.B. Buche, Nuß und Kirschbaum können Falten und Risse entstehen, die das betroffene Furnier zumindest teilweise unbrauchbar machen. Der Ausschuß beträgt hier 10 bis 20 %.The aim of the iron dryer is to get the veneers through while drying and cooling Smoothen smoothing. Compared to dryers and coolers with a straight belt guide Without pressure, most types of wood have a significantly better smoothing reached. But with sensitive types of wood such as Beech, nut and cherry tree can Wrinkles and cracks appear that affect the veneer at least partially to make something useless. The committee here is 10 to 20%.

Die Erfinder haben sich die Aufgabe gestellt, auch für schwierig zu trocknende Holzarten ein Verfahren zum Trocknen von Furnieren zu entwickeln, bei dem einwandfrei glatte Furniere erhalten werden und bei dem der Ausschuß durch Falten und Risse minimiert ist. Eine weitere Aufgabe ist es, eine Trocknungsvorrichtung zur Durchführung eines erfindungsgemäßen Verfahrens zu schaffen.The inventors set themselves the task, even for wood types that are difficult to dry to develop a process for drying veneers that is flawless Smooth veneers are obtained and the rejects are caused by folds and tears is minimized. Another object is to carry out a drying device to create a method according to the invention.

Die erste Aufgabe ist durch die Merkmale des Anspruchs 1 gelöst. Durch die Schräglage der Furniere im Trockner und im Kühler wird eine Komponente der Walkarbeit in den Umlenkungsstellen auch in Faserrichtung geleistet. Es hat sich gezeigt, daß alle getrockneten Furniere den Trockner weitestgehend ohne. Falten und Risse verlassen, wenn die Faserrichtung der Furniere während des Transportes durch den Trockner und den Kühler schräg zur Transportrichtung ist statt wie bisher üblich rechtwinklig.The first object is solved by the features of claim 1. The inclined position of the veneers in the dryer and in the cooler makes one component the flexing work in the deflection points also in the direction of the fibers. It has shown that all dried veneers largely without the dryer. Folds and Cracks leave when the grain of the veneers through during transportation the dryer and the cooler diagonally to the transport direction is instead of usual as before at right angles.

Patentanspruch 4 löst die zweite Aufgabe.Claim 4 solves the second problem.

Die Ansprüche 2 und 3 erleichtern die manuellen Arbeiten des Bedienpersonals. Claims 2 and 3 facilitate the manual work of the operating personnel.

Die Unteransprüche 5 bis 10 enthalten bevorzugte Ausführungsformen der erfindungsgemäßen Trocknungsvorrichtung. Die Merkmale gewährleisten einen sicheren Betrieb der Trocknungsvorrichtung.The sub-claims 5 to 10 contain preferred embodiments of the invention Drying apparatus. The features ensure a safe Operation of the drying device.

Die Schräglage, das ist der Winkel zwischen der Faserrichtung der Furniere und einer Linie rechtwinklig zur Transportrichtung, wird beim Aufgeben der Furniere auf den Trockner gezielt mit dem vorgesehenen Winkel von 20° bis 60°, vorzugsweise 30° bis 50°, herbeigeführt.The slant is the angle between the grain of the veneer and one Line perpendicular to the direction of transport is placed on the veneer when the veneers are placed Dryer specifically with the intended angle of 20 ° to 60 °, preferably 30 ° to 50 °, brought about.

In der Zuführvorrichtung sind die Geschwindigkeiten der Furniere in Transportrichtung rechts und links derart unterschiedlich eingestellt, daß die Übergabe der Furniere auf das Tragband, das ist das untere Transportband des Trockners, in der richtigen Schräglage erfolgt. Während des Trocknens und des Kühlens sind die Furniere in dieser Lage fixiert, weil sie zwischen den Transportbändern mechanisch gehalten sind. Die Austragsvorrichtung macht die Schräglage durch unterschiedliche Geschwindigkeiten, die denen in der Zuführvorrichtung umgekehrt entsprechen, weitestgehend rückgängig, um die weitere Handhabung zu erleichtern. Das Bedienpersonal muß sich daher nicht an geänderte Abläufe oder Handhabung gewöhnen.The speeds of the veneers in the feed direction are in the feed device so differently adjusted right and left that the transfer of the veneers on the conveyor belt, which is the lower conveyor belt of the dryer, in the correct one Inclined. The veneers are in during drying and cooling fixed this position because it is mechanically held between the conveyor belts are. The discharge device makes the inclination through different Speeds that correspond to those in the feeder, largely reversed to facilitate further handling. The operating staff therefore does not have to get used to changing processes or handling.

Eine bevorzugte Ausführung ist der Einsatz unterschiedlicher Durchmesser der angetriebenen Riemenscheiben nach Anspruch 6.A preferred embodiment is the use of different diameters of the driven ones Pulleys according to claim 6.

Der Einsatz einzeln antreibbarer Riemen nach Anspruch 7 ermöglicht eine sehr flexible Fahrweise und Anpassung der Schräglage während des laufenden Betriebes.The use of individually drivable belts according to claim 7 enables a very flexible driving style and adjustment of the incline during ongoing operation.

Eine Bremsvorrichtung nach Anspruch 8 ist einfach in vorhandene Anlagen nachrüstbar. Die Ansprüche 9 und 10 zeigen bevorzugte Ausführungsformen der Bremsvorrichtung.A braking device according to claim 8 is easy to retrofit in existing systems. Claims 9 and 10 show preferred embodiments of the braking device.

Die Zeichnungen dienen der Erläuterung der Erfindung anhand von vereinfacht und schematisch dargestellten Ausführungsbeispielen.

  • Figur 1 zeigt einen Längsschnitt einer erfindungsgemäßen Trocknungsvorrichtung.
  • Figur 2 zeigt die Seitenansicht einer Zuführvorrichtung nach Anspruch 6 als Einzelheit.
  • Figur 2a zeigt ein Detail aus Figur 2.
  • Figur 3 zeigt das Unterriemensystem gemäß Figur 2, senkrecht von oben gesehen.
  • Figur 4 zeigt das Oberriemensystem gemäß Figur 2, senkrecht von unten gesehen.
  • Figur 5 zeigt die Seitenansicht einer Zuführvorrichtung nach Anspruch 7 als Einzelheit.
  • Figur 6 zeigt das Unterriemensystem gemäß Figur 5, senkrecht von oben gesehen.
  • Figur 7 zeigt eine Bremsvorrichtung nach Anspruch 9.
  • Figur 8 zeigt eine Bremsvorrichtung nach Anspruch 10.
  • Figur 9 zeigt die Seitenansicht einer Austragsvorrichtung nach Anspruch 6 als Einzelheit.
    • The drawings serve to explain the invention using simplified and schematically illustrated exemplary embodiments.
  • Figure 1 shows a longitudinal section of a drying device according to the invention.
  • Figure 2 shows the side view of a feed device according to claim 6 as a detail.
  • FIG. 2a shows a detail from FIG. 2.
  • Figure 3 shows the lower belt system according to Figure 2, seen vertically from above.
  • FIG. 4 shows the upper belt system according to FIG. 2, viewed vertically from below.
  • Figure 5 shows the side view of a feed device according to claim 7 as a detail.
  • Figure 6 shows the lower belt system according to Figure 5, seen vertically from above.
  • Figure 7 shows a braking device according to claim 9.
  • Figure 8 shows a braking device according to claim 10.
  • Figure 9 shows the side view of a discharge device according to claim 6 as a detail.

    • Wie aus Figur 1 ersichtlich ist, besteht eine Trocknungsvorrichtung aus einer Zuführvorrichtung 1, einem Trockner 2, einem Kühler 3 und einer Austragsvorrichtung 4. Jede der einzelnen Vorrichtungen der Trocknungsvorrichtung hat ein eigenes Transportsystem. Die Geschwindigkeit der einzelnen Transportsysteme ist aufeinander abgestimmt und hängt vom Trocknungsprozeß ab.As can be seen from Figure 1, a drying device consists of a feed device 1, a dryer 2, a cooler 3 and a discharge device 4. Each of the individual devices of the drying device has its own transport system. The speed of the individual transport systems is on top of each other coordinated and depends on the drying process.

    Die in Figuren 2 bis 4 als Einzelheit dargestellte Zuführvorrichtung 1 ist für die halbautomatische Aufgabe der feuchten Furniere ausgerüstet. Auf einem Gestell 5 sind ein Saugkasten 6 und ein Transportsystem mit parallel angeordneten Riemen 10, 16, 19, 24 befestigt. Die Riemen 10, 16, 19, 24 sind nebeneinander angeordnet und jeweils über zwei beabstandete Riemenscheiben bzw. über eine Riemenscheibe und eine beabstandete Umlenkung geführt. Die Riemenscheiben sind jeweils auf Wellen befestigt. Der Pfeil 32 gibt die Transportrichtung an.The feed device 1 shown as a detail in FIGS. 2 to 4 is for the semi-automatic one Feed the wet veneers. On a rack 5 are a suction box 6 and a transport system with belts 10, 16 arranged in parallel, 19, 24 attached. The straps 10, 16, 19, 24 are arranged side by side and each over two spaced pulleys or over a pulley and led a spaced redirection. The pulleys are on shafts attached. The arrow 32 indicates the direction of transport.

    Der Saugkasten 6 besteht aus einer quaderförmigen Blechkonstruktion mit gelochtem Blech 7 auf der Unterseite und mit mindestens einem Saugrohr 8 mit einem Ventilator 9, das auf dem Saugkasten angeordnet ist. Der Saugkasten 6 erstreckt sich über die gesamte Breite der Transportebene und ist in seiner Längsrichtung horizontal, während er in Transportrichtung abfallend leicht geneigt ist.The suction box 6 consists of a cuboid sheet metal construction with perforated Sheet 7 on the underside and with at least one suction pipe 8 with a fan 9, which is arranged on the suction box. The suction box 6 extends over the entire width of the transport plane and is horizontal while in its longitudinal direction it is slightly inclined in the direction of transport.

    Das Transportsystem der Zuführvorrichtung 1 besteht aus einem Ober- und einem Unterriemensystem.The transport system of the feed device 1 consists of an upper and a Under belt system.

    Das Oberriemensystem ist zweigeteilt. Im Bereich des Saugkastens 6 sind die endlosen Riemen 10 mit flachem, rechteckigem Querschnitt. Sie sind unterhalb des Saugkastens entlang dem gelochten Blech 7 bis zu den Riemenscheiben 11 auf der antreibbaren Welle 12, die parallel zur und beabstandet von der hinteren unteren Längskante des Saugkastens 6 gelagert ist, und zurück durch den Saugkasten 6 und um die Umlenkung 13 vor der vorderen unteren Längskante des Saugkastens 6 zum gelochten Blech 7 geführt. Die Welle 12 und die Umlenkung 13 sind parallel beabstandet gelagert. Alle Riemenscheiben 11 haben den selben Durchmesser. Der zweite Bereich des Oberriemensystems beginnt an der antreibbaren Welle 14, die parallel zur Welle 12 zwischen dem Saugkasten 6 und der Welle 12 gelagert ist, und führt bis zum Tragband 15 des Trockners 2. Die endlosen Riemen 16 mit z.B. rundem Querschnitt sind hier von den Riemenscheiben 17 auf der Welle 14 über einen Kragarm des Gestells 5 bis zur Umlenkung 18, die parallel zur Welle 14 ist, und zurück zu den Riemenscheiben 17 geführt. Der Kragarm ist um die Welle 14 vertikal schwenkbar, so daß die Höhe der Umlenkung 18 einstellbar ist. Die Riemenscheiben 17 haben derart abgestuft unterschiedliche Durchmesser, daß eine lineare Geschwindigkeitsverteilung in Transportrichtung gesehen von links nach rechts gegeben ist. Die Welle 14 ist abweichend von der Horizontalen derart schräg gelagert, daß die Unterkanten der auf den Riemenscheiben 17 gelagerten Riemen 16 mit dem gelochten Blech 7 fluchten. Die Riemenscheiben 17 und die Umlenkung 18 weisen auf ihren peripheren Flächen z.B. halbkreisförmige Aussparungen auf, in denen die Riemen 16 geführt sind.The upper belt system is divided into two. In the area of the suction box 6 there are endless ones Belt 10 with a flat, rectangular cross section. You are below the Suction box along the perforated plate 7 up to the pulleys 11 on the drivable shaft 12 which is parallel to and spaced from the rear lower Longitudinal edge of the suction box 6 is mounted, and back through the suction box 6 and around the deflection 13 in front of the front lower longitudinal edge of the suction box 6 perforated sheet 7 out. The shaft 12 and the deflection 13 are spaced apart in parallel stored. All pulleys 11 have the same diameter. The second area of the upper belt system begins at the drivable shaft 14, the is mounted parallel to the shaft 12 between the suction box 6 and the shaft 12, and leads to the carrier belt 15 of the dryer 2. The endless belts 16 with e.g. round Cross section are here from the pulleys 17 on the shaft 14 via a Cantilever arm of the frame 5 up to the deflection 18, which is parallel to the shaft 14, and led back to the pulleys 17. The cantilever is vertical about shaft 14 pivotable so that the height of the deflection 18 is adjustable. The pulleys 17 have different diameters so graded that a linear velocity distribution seen from the left to the right in the direction of transport. The Deviating from the horizontal, shaft 14 is so inclined that the lower edges the belt 16 mounted on the pulleys 17 with the perforated Plate 7 are aligned. The pulleys 17 and the deflection 18 point to their peripheral areas e.g. semicircular recesses in which the straps 16 are led.

    Das Unterriemensystem ist unterhalb des Oberriemensystems angeordnet. Das Unterriemensystem ist zweigeteilt. Im vorderen Bereich, der - in Transportrichtung gesehen - unterhalb des letzten Drittels des Saugkastens 6 beginnt und im Bereich unterhalb der Welle 12 endet, sind alle Riemen 19 mit gleicher Geschwindigkeit angetrieben. Die endlosen Riemen 19 mit flachem, rechteckigen Querschnitt sind über die Riemenscheiben 20 auf der Welle 21 und die Riemenscheiben 22 auf der antreibbaren Welle 23 geführt. Die einer Welle 21, 23 zugeordneten Riemenscheiben 20, 22 haben jeweils den selben Durchmesser. Im zweiten Bereich haben die endlosen Riemen 24 einen z.B. runden Querschnitt und sind von den Riemenscheiben 25 auf der Welle 26, die in Transportrichtung gesehen kurz vor der Welle 23 gelagert ist, über den Kragarm, die Umlenkung 27 und die Spannrollen 28 geführt. Die Riemenscheiben 25 haben abgestuft unterschiedliche Durchmesser und weisen wie die Umlenkung 27 auf ihren peripheren Flächen Aussparungen auf, die in etwa dem Querschnitt der Riemen 24 entsprechen und in denen die Riemen 24 geführt sind. Die Welle 26 ist abweichend von der Horizontalen derart schräg gelagert, daß die Oberkanten der auf den Riemenscheiben 25 geführten Riemen 24 mit der Transportfläche fluchten.The lower belt system is located below the upper belt system. The The belt system is divided into two parts. In the front area, the - in the direction of transport seen - starts below the last third of the suction box 6 and in the area ends below the shaft 12, all belts 19 are at the same speed driven. The endless belts 19 with a flat, rectangular cross section are via the pulleys 20 on the shaft 21 and the pulleys 22 on the driven shaft 23 out. The pulleys assigned to a shaft 21, 23 20, 22 each have the same diameter. In the second area there are endless ones Belt 24 a e.g. round cross section and are from the pulleys 25th on the shaft 26, which is mounted just before the shaft 23 in the direction of transport, guided over the cantilever arm, the deflection 27 and the tensioning rollers 28. The pulleys 25 have different diameters and show like that Deflection 27 on their peripheral surfaces recesses that are about the Cross section of the belt 24 correspond and in which the belt 24 are guided. The Deviating from the horizontal, shaft 26 is so inclined that the upper edges the belt 24 guided on the pulleys 25 with the transport surface aligned.

    Die Riemenscheiben 11, 17, 20, 22, 25 sind jeweils fest mit der zugehörigen Welle 12, 14, 21, 23, 26 verbunden. The pulleys 11, 17, 20, 22, 25 are each fixed to the associated shaft 12, 14, 21, 23, 26 connected.

    Die Durchmesser der unterschiedlich großen Riemenscheiben 17, 25 sind so aufeinander abgestimmt, daß die Geschwindigkeit der Riemen 16, 24 kontinuierlich von - in Transportrichtung gesehen - links nach rechts oder umgekehrt abnimmt und damit auch die Transportgeschwindigket der Furniere 31.The diameters of the pulleys 17, 25 of different sizes are thus one on the other matched that the speed of the belts 16, 24 continuously from - in Transport direction seen - decreases left to right or vice versa and thus also the transport speed of the veneers 31.

    Die Riemen 10, 16, 19, 24 sind über ein Antriebssystem mit z.B. Getriebemotor 29 und Kettentrieb 30 antreibbar.The belts 10, 16, 19, 24 are connected via a drive system with e.g. Gear motor 29 and chain drive 30 drivable.

    Im Betrieb hebt das Bedienpersonal ein Furnier 31 derart an, daß zumindest ein Teil in den Saugbereich des Saugkastens 6 gerät und dann vollständig gegen das gelochte Blech 7 und die Riemen 10 gedrückt wird. Die Riemen 10 der Zuführvorrichtung 1 fördern das Furnier 31 entlang dem gelochten Blech 7 in Richtung Trockner 2. Am Ende des Saugkastens 6 - in Transportrichtung gesehen - fällt das Furnier 31 auf das Unterriemensystem und wird mit einer mittleren Transportgeschwindigkeit, die der im Trockner 2 entspricht, weiter bis zum Tragband 15 transportiert. Während dieses Transportes wird das Furnier 31 infolge des Geschwindigkeitsunterschieds der Riemen 16, 24 in eine gewünschte Schräglage versetzt. Der erforderliche Geschwindigkeitsunterschied läßt sich leicht aus der Transportstrecke zwischen der Welle 26 und der Umlenkung 27 sowie dem Winkel der Schräglage errechnen.In operation, the operating staff lifts a veneer 31 in such a way that at least one part gets into the suction area of the suction box 6 and then completely against it perforated sheet 7 and the belt 10 is pressed. The belts 10 of the feeder 1 convey the veneer 31 along the perforated plate 7 in the direction Dryer 2. At the end of suction box 6 - seen in the direction of transport - this falls Veneer 31 on the lower belt system and is with a medium transport speed, which corresponds to that in the dryer 2, transported to the carrying belt 15. During this transport, the veneer 31 becomes due to the difference in speed the belt 16, 24 placed in a desired inclined position. The required speed difference can be easily from the transport route between the shaft 26 and the deflection 27 and the angle of the inclined position calculate.

    Eine andere Ausführung der Erfindung nach Anspruch 6 ist in den Figuren 5 und 6 dargestellt. Der Aufbau entspricht der vorherigen Beschreibung mit dem Unterschied, daß die unterschiedlichen Geschwindigkeiten der Riemen 16, 24, die hier auch Flachriemen sein können, durch einzelne Antriebe 34, 36 erreicht ist:Another embodiment of the invention according to claim 6 is in FIGS. 5 and 6 shown. The structure corresponds to the previous description with the difference that the different speeds of the belts 16, 24, which are also flat belts can be achieved by individual drives 34, 36:

    Die Welle 12 ist gemeinsam mit der Welle 23 des Unterriemensystems antreibar. Die Riemenscheiben 33, die alle gleich groß sind, sind zwischen der Welle 12 und dem Saugkasten 6 einzeln gelagert. Die Drehachse der Riemenscheiben 33 ist parallel zur Welle 12. Jede Riemenscheibe 33 hat einen eigenen regelbaren Antrieb 34.The shaft 12 can be driven together with the shaft 23 of the lower belt system. The Pulleys 33, all of the same size, are between the shaft 12 and the Suction box 6 stored individually. The axis of rotation of the pulleys 33 is parallel to Shaft 12. Each pulley 33 has its own controllable drive 34.

    Die Riemenscheiben 35 sind gleich groß, sind einzeln gelagert und haben jeweils einen regelbaren Antrieb 36.The pulleys 35 are the same size, are individually stored and each have an adjustable drive 36.

    Im Betrieb sind die Geschwindigkeiten der Antriebe 34, 36 so eingeregelt, daß die Geschwindigkeit der Riemen 16, 24 von links nach rechts oder umgekehrt linear abnimmt und die gewünschte Schräglage des Furniers 31 erreicht wird, wobei im Mittel die vom Prozeß abhängige Transportgeschwindigkeit eingehalten ist. In operation, the speeds of the drives 34, 36 are adjusted so that the Speed of the belts 16, 24 linearly from left to right or vice versa decreases and the desired inclined position of the veneer 31 is reached, wherein in The transport speed dependent on the process is observed.

    Die Erfindung umfaßt auch alle anderen Anordnungen und Antriebsmöglichkeiten, die unterschiedliche Riemengeschwindigkeiten erlauben.The invention also includes all other arrangements and drive options that allow different belt speeds.

    Eine weitere Ausführung der Erfindung nach Anspruch 9 ist in Figur 7 dargestellt. Der Aufbau entspricht dem der Figuren 2 bis 4 mit den Unterschieden, daß die Riemenscheiben 17, 25 gleiche Durchmesser haben und daß eine Bremsvorrichtung installiert ist.Another embodiment of the invention according to claim 9 is shown in Figure 7. The Structure corresponds to that of Figures 2 to 4 with the differences that the pulleys 17, 25 have the same diameter and that a braking device is installed is.

    Eine Bremsvorrichtung ist außermittig in ca. 2/3 der Breite der Zuführvorrichtung 1 unter oder über der Transportebene zwischen zwei benachbarten Riemen 16, 24 angeordnet. Die Bremsvorrichtung besteht aus einer Düse 37 mit innenliegendem Saugventilator 38 und einer auf die Transportebene gerichteten Öffnung 39. Die Öffnung 39 befindet sich in unmittelbarer Nähe zur Transportebene. Zwischen Saugventilator 38 und Öffnung 39 ist eine Klappe 40 angeordnet.A braking device is off-center in approximately 2/3 of the width of the feed device 1 below or above the transport plane between two adjacent belts 16, 24 arranged. The braking device consists of a nozzle 37 with an internal one Suction fan 38 and an opening 39 directed towards the transport plane Opening 39 is in the immediate vicinity of the transport level. Between suction fan 38 and opening 39, a flap 40 is arranged.

    Im Betrieb erzeugt der Saugventilator 38 in der Düse 37 einen Unterdruck. Die Klappe 40 ist geschlossen. In dem Moment, in dem ein Furnier 31 die Düse 37 passiert, öffnet die Klappe 40. Infolge des Druckgefälles wird das Furnier 31 gegen die Öffnung 39 gedrückt und einseitig festgehalten, während die andere Seite des Furniers 31 weiter transportiert wird. Nach einem bestimmten Zeitintervall, das von der Transportgeschwindigkeit und der zu erzielenden Schräglage abhängt, schließt die Klappe 40 und die Düse 37 gibt das Furnier 31 frei, das jetzt die Lage im gewünschten Winkel erreicht hat. Der Weitertransport bis zum Tragband 15 des Trockners 2 erfolgt jetzt gleichmäßig auf beiden Seiten des Furniers 31, so daß seine Lage erhalten bleibt.In operation, the suction fan 38 generates a negative pressure in the nozzle 37. The flap 40 is closed. The moment a veneer 31 passes the nozzle 37 opens the flap 40. As a result of the pressure drop, the veneer 31 is against the opening 39 pressed and held on one side, while the other side of the veneer 31 is transported further. After a certain time interval that depends on the transport speed and depends on the inclination to be achieved, the flap 40 closes and the nozzle 37 releases the veneer 31, which is now in the desired angle has reached. The further transport to the carrier belt 15 of the dryer 2 now takes place evenly on both sides of the veneer 31 so that its position is preserved.

    Anstatt des Saugventilators 38 kann auch eine externe Vakuumquelle an der Düse 37 angeschlossen sein.Instead of the suction fan 38, an external vacuum source on the nozzle 37 can also be used be connected.

    Eine andere Ausführungsart einer Bremsvorrichtung nach Anspruch 10 ist in Figur 8 dargestellt. Eine antreibbare Scheibe 41 ist unterhalb der Transportbahn in geringer Entfernung zwischen zwei benachbarten Riemen 16, 24 außermittig in ca. 2/3 der Breite der Zuführvorrichtung 1 angeordnet. Die obere Tangente der Scheibe 41 fluchtet mit der Transportbahn, die Drehachse ist rechtwinklig zur Transportrichtung. Oberhalb der Scheibe 41 ist eine drehbar gelagerte Scheibe 42 an einem Stempel 43 befestigt. Die Drehachse der Scheibe 42 ist senkrecht über und parallel zur Drehachse der Scheibe 41. Der Stempel 43 ist auf und ab antreibbar, z.B. über Pneumatik oder Elektromagnet.Another embodiment of a braking device according to claim 10 is in Figure 8 shown. A drivable disc 41 is less below the transport path Distance between two adjacent belts 16, 24 off-center in about 2/3 of the Width of the feed device 1 arranged. The upper tangent of disc 41 is aligned with the transport path, the axis of rotation is perpendicular to the transport direction. Above the disk 41 is a rotatably mounted disk 42 on a punch 43 attached. The axis of rotation of the disk 42 is perpendicular to and parallel to the axis of rotation the disc 41. The punch 43 can be driven up and down, e.g. about pneumatics or electromagnet.

    Die Scheibe 41 ist ständig über z.B. einen Getriebemotor 44 langsam angetrieben. Die Drehrichtung der Scheibe 41 entspricht der Transportrichtung, die Umfangsgeschwindigkeit ist wesentlich langsamer als die Transportgeschwindigkeit des Riemensystems. Sobald sich ein Furnier 31 über der Scheibe 41 befindet, fährt der Stempel 43 aus, so daß die Scheibe 42 das Furnier 31 gegen die Scheibe 41 drückt. Aufgrund der geringen Umfangsgeschwindigkeit der Scheibe 41 wird das Furnier 31 einseitig abgebremst und somit in eine Schräglage verzogen. Sobald die erforderliche Schräglage erreicht ist, fährt der Stempel 43 ein und gibt das Furnier 31 frei, so daß es in der vorgesehenen Schräglage zum Tragband 15 transportiert wird.The disk 41 is constantly over e.g. a gear motor 44 slowly driven. The direction of rotation of the disk 41 corresponds to the direction of transport, the peripheral speed is much slower than the transport speed of the Belt system. As soon as there is a veneer 31 over the pane 41, the Stamp 43 so that the disc 42 presses the veneer 31 against the disc 41. Due to the low peripheral speed of the disk 41, the veneer 31 braked on one side and thus warped into an inclined position. Once the required Oblique position is reached, the punch 43 retracts and releases the veneer 31, so that it is transported to the carrying belt 15 in the inclined position provided.

    Eine Austragsvorrichtung 4 gemäß Anspruch 6 ist in Figur 9 als Einzelheit dargestellt. Auf einem Gestell 45 befindet sich ein Transportsystem mit Riemen 46. Die runden Riemen sind von den Riemenscheiben 48 auf der antreibbaren Welle 49 über die Umlenkung 47 und zurück geführt. Die Riemenscheiben 48 haben abgestuft unterschiedliche Durchmesser; ihre Anordnung ist so, daß die Schräglage der Furniere 31 im Trockner 2 und Kühler 3 rückgängig gemacht wird. Die Welle 49 ist derart schräg gelagert, daß die Oberkante der auf den Riemenscheiben 48 geführten Riemen 46 mit der Transportbahn fluchtet. Die Welle 49 ist mit einem Antrieb 50 gekoppelt.A discharge device 4 according to claim 6 is shown as a detail in FIG. On a frame 45 is a transport system with belts 46. The round Belts are from the pulleys 48 on the driven shaft 49 via the Deflection 47 and led back. The pulleys 48 have different gradations Diameter; their arrangement is such that the inclination of the veneers 31st is reversed in dryer 2 and cooler 3. The shaft 49 is so oblique stored that the upper edge of the belt 46 guided on the pulleys 48 with the transport track is aligned. The shaft 49 is coupled to a drive 50.

    Claims (10)

    1. A method of drying veneers, in particular sliced veneers, comprising at least the steps of feeding, drying, optionally cooling and delivering the veneers, wherein during drying and, optionally, during cooling between two conveyor belts the veneers are repeatedly turned and/or subjected to pressure, characterised in that the veneers are brought into an inclined position during feeding, wherein the angle between the grain direction of the veneers and a line at right angles to the conveying direction of the dryer is 20° to 60°, and in that the veneers are dried and cooled in this inclined position.
    2. A method according to claim 1, characterised in that the veneers are moved from an inclined position into a position substantially at right angles to the conveying direction during delivery.
    3. A method according to claims 1 and 2, characterised in that the veneers are conveyed at different speeds on the left and the right - seen in the conveying direction - during feeding and, optionally, during delivery.
    4. A drying device for carrying out the method according to any one of claims 1 to 3, comprising
      a feed device (1) with a suction box (6) and/or a transport system with a plurality of belts (10),
      a dryer (2) with a plurality of zones and a transport system with a carrying belt (16) and a covering belt,
      optionally a cooler (3) with a transport system with a carrying and a covering belt, and
      a delivery device (4) with a transport system with a plurality of belts (46),
      wherein pressure is exerted on the veneers (31) in the dryer (2) and, optionally, in the cooler (3) by repeated turning of the conveyor belts or by pressure rollers at a plurality of points, and wherein the speeds of the individual transport systems are controllable so as to be adapted to one another, characterised in that different speeds can be set on the left and the right - seen in the conveying direction - in the feed device (1) and, optionally, in the delivery device (4).
    5. A drying device according to claim 4, characterised in that the individual belts (16, 24, 46) of the transport systems of the feed device (1) and, optionally, the delivery device (4) are drivable at different speeds.
    6. A drying device according to claim 5, characterised in that the drivable belt pulleys (17, 25, 48) have different diameters, one drive (29, 50) acting on all drivable shafts (12, 14, 23, 26).
    7. A drying device according to claim 5, characterised in that the drivable belt pulleys (33, 35) have individual controllable drives (34, 36).
    8. A drying device according to claim 4, characterised in that a braking device for the veneers (31) is installed in the feed device (1) eccentrically of the width of the conveying path.
    9. A drying device according to claim 8, characterised in that the braking device is a vacuum nozzle (37) with a time controllable opening (39) directed towards the conveying plane and spaced slightly from the conveying path.
    10. A drying device according to claim 8, characterised in that a drivable wheel (41) is arranged below the conveying path at the level of the upper edge of the belts (24), and above this wheel (41) is arranged a plunger (43) with a rotatably mounted wheel (42).
    EP00909220A 1999-03-11 2000-02-19 Method for drying veneer and corresponding drying device Expired - Lifetime EP1161647B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19910832 1999-03-11
    DE19910832A DE19910832C1 (en) 1999-03-11 1999-03-11 Method for drying wood veneer sheets has the sheets aligned with the grain at an angle to the transport direction through the dryers
    PCT/EP2000/001383 WO2000053984A1 (en) 1999-03-11 2000-02-19 Method for drying veneer and corresponding drying device

    Publications (2)

    Publication Number Publication Date
    EP1161647A1 EP1161647A1 (en) 2001-12-12
    EP1161647B1 true EP1161647B1 (en) 2004-05-06

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    US (1) US6581300B1 (en)
    EP (1) EP1161647B1 (en)
    JP (1) JP3754894B2 (en)
    AT (1) ATE266182T1 (en)
    BR (1) BR0008864A (en)
    CA (1) CA2371552C (en)
    DE (2) DE19910832C1 (en)
    DK (1) DK1161647T3 (en)
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    PT (1) PT1161647E (en)
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    DE2716086B2 (en) * 1977-04-12 1980-06-04 Babcock-Bsh Ag Vormals Buettner- Schilde-Haas Ag, 4150 Krefeld Continuous dryer for web or sheet material
    US4193207A (en) * 1978-03-20 1980-03-18 Weyerhaeuser Company Method for veneer drying
    DE3405754A1 (en) * 1984-02-17 1985-08-22 Babcock-BSH AG vormals Büttner-Schilde-Haas AG, 4150 Krefeld Veneer dryer for knife veneers
    US4738035A (en) * 1984-02-17 1988-04-19 Babcock-Bsh Aktiengesellschaft Drying apparatus for sliced veneer
    FR2580063A1 (en) * 1985-04-03 1986-10-10 Strasbourg Ste Indle Forges Apparatus for drying wood veneer
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    US5062218A (en) * 1990-10-09 1991-11-05 David R. Webb Co., Inc. Screen dryer
    IT1249053B (en) * 1991-05-22 1995-02-11 Cremona Angelo & Figlio SYSTEM WITH BELT CONVEYOR FOR DRYING WOOD PANELS
    US5935629A (en) 1998-03-19 1999-08-10 Campagna-Turano Bakeries, Inc. Apparatus and method for cross-scoring a dough loaf
    US6108942A (en) * 1998-07-20 2000-08-29 Fezer S.A. Industrias Mecanicas Opposed belt drying apparatus for sliced wood veneers

    Also Published As

    Publication number Publication date
    PT1161647E (en) 2004-09-30
    CA2371552C (en) 2005-07-05
    JP2002538987A (en) 2002-11-19
    DE19910832C1 (en) 2000-04-27
    ES2220418T3 (en) 2004-12-16
    BR0008864A (en) 2002-02-13
    DE50006335D1 (en) 2004-06-09
    JP3754894B2 (en) 2006-03-15
    DK1161647T3 (en) 2004-09-13
    US6581300B1 (en) 2003-06-24
    EP1161647A1 (en) 2001-12-12
    TW469337B (en) 2001-12-21
    WO2000053984A1 (en) 2000-09-14
    CA2371552A1 (en) 2000-09-14
    ATE266182T1 (en) 2004-05-15

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