EP0192207B1 - Séchoir pour bois de placage - Google Patents

Séchoir pour bois de placage Download PDF

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Publication number
EP0192207B1
EP0192207B1 EP19860101925 EP86101925A EP0192207B1 EP 0192207 B1 EP0192207 B1 EP 0192207B1 EP 19860101925 EP19860101925 EP 19860101925 EP 86101925 A EP86101925 A EP 86101925A EP 0192207 B1 EP0192207 B1 EP 0192207B1
Authority
EP
European Patent Office
Prior art keywords
veneer
deflection devices
dryer according
veneer dryer
rollers
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
Application number
EP19860101925
Other languages
German (de)
English (en)
Other versions
EP0192207A3 (en
EP0192207A2 (fr
Inventor
Ingo Dr. Grebe
Walter Münch
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 GmbH and Co KG
Original Assignee
Babcock BSH AG
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
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Priority claimed from US06/702,554 external-priority patent/US4654981A/en
Priority claimed from DE19853529000 external-priority patent/DE3529000A1/de
Application filed by Babcock BSH AG filed Critical Babcock BSH AG
Publication of EP0192207A2 publication Critical patent/EP0192207A2/fr
Publication of EP0192207A3 publication Critical patent/EP0192207A3/de
Application granted granted Critical
Publication of EP0192207B1 publication Critical patent/EP0192207B1/fr
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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 veneer dryer for sliced veneers according to the preamble of claim 1.
  • the weight of the top tape can be used to smooth the veneers. In many cases, however, this smoothing effect is not sufficient to prevent the appearance of waves during drying.
  • roller dryers In roller dryers you can achieve a greater pressing pressure and thus a better smoothing effect - by passing the veneer between rollers arranged one above the other, which also promote it.
  • roller dryers have disadvantages that have a particularly serious effect on thin, sensitive and high-quality sliced veneers: the veneer requires a certain degree of rigidity so that it can be conveyed from pair of rollers to pair of rollers. This is not the case with thin and / or too wet veneers.
  • the veneers are firmly clamped between the pairs of rolls. Since the veneers shrink up to 12% during the drying process, this leads to tensions, which in particular destroy thin veneers.
  • the veneer With belt dryers, the veneer can shrink between the belts, thus avoiding cracks. At the same time, guiding thin, wet veneers between tapes is easy. The disadvantage remains that the weight of the cover tape is not sufficient to smooth the veneer satisfactorily. Thin sliced veneers are therefore often dried in belt dryers and then additionally smoothed in a smoothing press in order to remove the waves that occurred during drying.
  • EP-A-0152576 which represents the state of the art under Article 54 (3) EPC, describes a veneer dryer of the generic type with two superimposed conveyor belts, which circulate deflection devices, in particular rollers, drums or rollers, essentially in a loop.
  • the conveyor belts run in a straight line between two deflection devices, the length of which is at least half the maximum veneer width.
  • the veneer sheets lie alternately around the deflection devices lying between the two conveyor belts, they are smoothed by the pressure of the respective outer belt that occurs during deflection. There is no pressing pressure in the straight parts of the conveyor line, which means that the veneer sheets can shrink freely there. In addition, they are permanently smoothed out by the relative movement of the conveyor belts against each other, which is generated by the mutual deflection. With this veneer dryer it is possible to dry veneers with considerably improved quality. The veneers are very supple even when they are very dry - well below 12% residual moisture, which makes their processing much easier.
  • the conveyor belts alternately wrap around rollers, drums or rollers, which are arranged one behind the other in a horizontal plane.
  • a rectilinear conveying path is connected upstream of the first deflection device in the veneer dryer.
  • the veneer dryers are built up in modules from successive fields, the rollers, drums or rollers being arranged in pairs in a field.
  • the present invention has for its object to make a generic veneer dryer space-saving and inexpensive.
  • a further advantage is that the arrangement of deflecting devices one above the other makes it possible to reduce the distance between two deflecting devices from one another without the veneers starting to slide due to a steeper increase in the straight-line portions of the conveying path.
  • existing old systems with a straight conveyor line can be upgraded to higher performance without requiring additional space, while the veneer quality is significantly improved.
  • the subclaims contain preferred embodiments of the invention. Their features, individually and in combination, improve the veneer quality, operational safety and costs and / or the construction of the veneer dryer.
  • the side of the veneer sheet lying against the deflection devices is also dried during circulation. This prevents thermal tension and the curling of the veneer sheet (Curie effect).
  • the differential speed according to claim 5 reduces the occurrence of cracks.
  • Veneers which are dried with the veneer dryers according to claims 6 or 7 are of particularly good quality, the performance being increased inexpensively in the embodiment according to claim 7.
  • the feature of claim 8 ensures free shrinking without the veneer sheet slipping.
  • claim 10 shows a simple construction for heating the surface of the rollers.
  • FIG. 1 and Figure 2 show simplified longitudinal sections through veneer dryer according to the invention.
  • a veneer dryer according to the invention is constructed in a modular manner from dryer fields 1.1-1.2 or 1.3-1.8 arranged one behind the other, each dryer field 1.1-1.8 containing devices with which the required drying climate can be produced. These devices include circulating air fans 2, heating registers, control devices, etc. Following the respective last dryer field 1.2 or 1.8, a transfer field 3 leads to a cooling field 4.
  • the last two dryer fields 1.1, 1.2 and 1.7, 1.8 are each with deflection devices 5 in Form fitted with cylinders lying horizontally across the conveying direction; In the present embodiments, hollow rollers driven by chains are used, and the use of rollers or drums is also possible.
  • rollers 5 are arranged in successive groups of vertically superimposed rollers 5, two groups being installed in a dryer field 1.1, 1.2, 1.7, 1.8.
  • the roller length corresponds to the maximum veneer length (approx. 5 m), its diameter is approx. 85 cm.
  • the length of a dryer field equipped with rollers 5 is approximately 3 m.
  • the dryer fields 1.1 and 1.2 each have two groups each of four rolls 5 lying vertically one above the other, that is to say a total of 16 rolls.
  • two groups of two rolls 5 lying vertically one above the other are arranged in fields 1.7 and 1.8, that is to say a total of 8 rolls.
  • a belt conveyor consisting of two endless conveyor belts 6.1.6.2 runs through the dryer fields 1.1-1.2, 1.3-1.8.
  • the conveying runs of the belts 6.1, 6.2 run straight through the four fields 1.3-1.6 before they are deflected upwards by the first roller 5.1.
  • the proportion of the curved conveying path in the total conveying path is at least 40%, preferably between 50% and 70%.
  • the fields 1.3-1.6 are each approximately 2 m long.
  • the proportion of the rectilinear part of the conveyor line in front of the first deflection roller is less than 50%, preferably between 20 and 35% of the total conveyor line; in the example according to FIG. 2 approx. 32%.
  • three fields are each equipped with four rollers.
  • the two belts 6.1, 6.2 are deflected upwards by an angle of approximately 150 ° by the first roller 5.1. They then alternately loop around the rollers of the first group one after the other from bottom to top until they are deflected horizontally by the top roller 5.2 of the first group to the top roller 5.3 of the second group.
  • the conveyor belts 6.1, 6.2 are each deflected by approximately 120 ° from the middle rollers of a group (FIG. 1), while the bottom and top rollers 5.1 and 5.2 respectively deflect by approximately 150 °.
  • rollers of the second group are mutually wrapped around from top to bottom in accordance with those of the first group, the bottom roller 5.4 of this group then deflects the belts horizontally in the direction of the next field 1.2 or 1.8.
  • the outlets 1.2 and 1.8 on the outlet side are passed through in an identical manner by the belts 6.1, 6.2 before they are separated in the transition zone 3 and returned to the dryer entrance.
  • the belts 6.1, 6.2 run straight along the conveyor path between two rollers 5 on a path which corresponds to at least half of the maximum veneer width; in the present example between two superimposed rollers 5 approx. 50 cm with a maximum veneer width of 1000 mm. This is achieved in that two adjacent rollers 5 do not follow one another directly, but are arranged at a distance from one another. It has proven to be particularly advantageous if the circumference and spacing of two rollers 5 lying one above the other are coordinated in such a way that the rectilinear part is inclined at less than 45 °, preferably at approximately 30 °, against the horizontal. This prevents slippage even of the thinnest veneers.
  • the bands 6.1, 6.2 are made of non-stretchable material. It is quite possible that they have a certain elasticity if it is ensured that they are able to generate the desired pressing pressure during the deflection by means of a sufficiently high tensile stress. They have openings for the drying medium - hot air in the present examples, they are as small as possible so that the largest possible contact surface on the veneer is available.
  • the tapes are also designed so that they can slide back and forth on the veneer without creating any markings. Flat spiral wire mesh tapes and spiral tapes made from round wire have proven themselves in practice.
  • Nozzle boxes are located in the dryer along the conveying path of the veneer, from which hot air is blown essentially perpendicularly onto both veneer sides.
  • the nozzle boxes are arranged both to the right and to the left of the rollers 5 along an arc.
  • drums installed in fields 1.1, 1.2 and 1.7.1.8.
  • Nozzle boxes are permanently installed inside the drums.
  • the drums have no bottoms, and their walls are also perforated. Therefore, the hot air can be blown through the drum walls and the internal conveyor belt onto the veneers with the inner nozzle boxes.
  • Other heating systems can also be installed inside the drums, for example oil or gas burners, with which the drums are heated directly.
  • the conveying path of the veneers runs in a straight line through the first fields 1.3-1.6.
  • the nozzle boxes are arranged next to each other on both sides of the conveyor line to achieve a high drying performance.
  • This configuration of the dryer enables its overall performance to be increased cost-effectively without the veneer quality being significantly impaired.
  • the sliced veneers are introduced individually into the veneer dryer via an inlet field. As they pass, they lie between the carrier and cover tape, the weight of the cover tape ensuring a certain smoothing effect. The weight of the cover tape and the difference in speed between the carrier and cover tape are such that the veneers are not prevented from shrinking during drying.
  • the forced guidance along an arcuate path creates a radial pressing pressure that presses vertically on the veneer surface:
  • the outer band (for the first roller 5.1 the lower belt 6.2) presses the veneer against the inner belt, which in turn rests on the roller 5.1 .
  • the veneer is smoothed by the high pressure, free shrinking is not possible in this phase due to the high pressure.
  • the tapes 6.1, 6.2 are designed so that there are no marks on the veneer.
  • the contact pressure can be adjusted according to the respective requirements with tensioning devices via the tension of the belts 6.1,6.2. A difference in speed of 1% -12%, preferably between 2% and 5%, is set between the bands 6.1,6.2.
  • the belts 6.1, 6.2 in the transition piece between two rollers 5 each run straight for a distance. No contact pressure occurs during the straight-line guidance - with the exception of the pressure caused by the component of the shroud weight perpendicular to the conveyor track; the veneer can shrink freely.
  • the component of the weight perpendicular to the conveyor track can be varied via the angle of inclination of the conveyor track to the horizontal; in the present example, it is approximately 30 degrees between two rolls of a group. It has been shown that this angle cannot be increased arbitrarily due to the tendency of the veneer sheets to collapse.
  • the minimum distance for the straight course ensures that each fiber of a veneer sheet can shrink freely at least for a moment, thus preventing cracks between adjacent fibers.
  • the rollers 5 of a group are rotated alternately on the right or left with an alternating sense of rotation.
  • This guide exposes both sides of a veneer sheet to the same treatment.
  • this type of rotation produces a periodic back and forth movement of the belts 6.1, 6.2 against one another, since the respective outer belt remains as a function of the different rotation radii.
  • the veneers are smoothed by this movement of the belts 6.1, 6.2.
  • the strength of the relative movement against each other can be influenced by the thickness of the conveyor belts 6.1, 6.2, since their amount depends on the different radii of revolution and thus on the belt thickness.
  • the smoothing is supported by the difference in speed between the two bands 6.1, 6.2.
  • rollers 5 are also blown with hot air from nozzle boxes on the side opposite the circulation and thus heated. They emit this heat through radiation to the inside of the veneer.
  • the inside of the veneer is blown directly through the perforated drum wall.
  • the nozzle boxes in the drums precise dosing and guidance of the hot air flow is possible.
  • the veneers leave the dryer via the transfer field 3, from where they are conveyed into the cooling field 4 by the conveyor system. There they are cooled and then collected.

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

Claims (10)

1. Séchoir pour placages tranchés, comprenant deux bandes transporteuses superposées (6.1, 6.2) qui, à l'intérieur d'une chambre de séchage, tournent conjointement autour d'au moins quatre dispositifs de renvoi (5) sensiblement en formant une boucle et qui s'étendent de façon linéaire entre deux dispositifs de renvoi (5) sur un parcours dont la longueur est mesurée de façon qu'un placage, guidé dans ce parcours, puisse librement se rétrécir, au moins 40% du parcours de transport s'étendant de façon déviée dans la partie de la chambre de séchage qui est équipée de dispositifs de renvoi, caractérisé par au moins deux groupes successifs de chaque fois au moins deux dispositifs de renvoi (5) agencés l'un au-dessus de l'autre, les bandes transporteuses (6) enlaçant, le long du parcours de transport, successivement et mutuellement les dispositifs de renvoi (5) d'un groupe.
2. Séchoir suivant la revendication 1, caractérisé par au moins quatre groupes de chaque fois deux dispositifs de renvoi (5) sous la forme de cylindres couchés.
3. Séchoir suivant la revendication 1, caractérisé par au moins deux groupes de chaque fois quatre dispositifs de renvoi (5) sous la forme de cylindres couchés.
4. Séchoir suivant l'une des revendications 1 à 3, caractérisé par des dispositifs de renvoi chauffés (5).
5. Séchoir suivant l'une des revendications 1 à 4, caractérisé en ce qu'une vitesse différentielle de 1 % à 12%, de préférence de 2% à 5%, existe entre les deux bandes transporteuses (6.1, 6.2).
6. Séchoir suivant l'une des revendications 1 à 5, caractérisé par des dispositifs de renvoi (5) le long de la totalité du parcours de transport, la fraction du parcours de transport dévié étant de 50% à 70%.
7. Séchoir suivant l'une des revendications 1 à 5, caractérisé par une partie, guidée de manière linéaire, du parcours de transport en amont du premier dispositif de renvoi (5.1 ), la fraction de cette partie par rapport au parcours de transport global étant inférieure à 50%, de préférence de 20 à 35%.
8. Séchoir suivant l'une des revendications 1 à 7, caractérisé en ce que, entre deux dispositifs de renvoi (5) d'un groupe, les bandes transporteuses (6) s'étendent de manière inclinée par rapport à l'horizontale de moins de 45°, de préférence à environ 30°.
9. Séchoir suivant l'une des revendications 1 à 8, caractérisé par des boîtes à tuyères à partir desquelles le placage en train de passer est soumis à un soufflage par un milieu de séchage, sensiblement perpendiculairement.
10. Séchoir suivant la revendication 9, comprenant des cylindres (5) et/ou des rouleaux comme dispositifs de renvoi, caractérisé par des boîtes à tuyères du côté des cylindres (5) et/ou rouleaux, qui est opposé aux bandes transporteuses (6) en circulation, ces cylindres étant soumis à un soufflage par un milieu chauffé à partir de ces boîtes.
EP19860101925 1985-02-19 1986-02-14 Séchoir pour bois de placage Expired EP0192207B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US06/702,554 US4654981A (en) 1984-02-17 1985-02-19 Drying apparatus for sliced veneer
US702554 1985-02-19
DE3529000 1985-08-13
DE19853529000 DE3529000A1 (de) 1985-02-19 1985-08-13 Furniertrockner fuer messerfurniere

Publications (3)

Publication Number Publication Date
EP0192207A2 EP0192207A2 (fr) 1986-08-27
EP0192207A3 EP0192207A3 (en) 1987-01-07
EP0192207B1 true EP0192207B1 (fr) 1988-06-01

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ID=25835010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860101925 Expired EP0192207B1 (fr) 1985-02-19 1986-02-14 Séchoir pour bois de placage

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EP (1) EP0192207B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005047793A1 (fr) 2003-10-21 2005-05-26 Grenzebach Bsh Gmbh Séchoir pour éléments de placage
DE102005010321A1 (de) * 2005-03-03 2006-09-14 Grenzebach Bsh Gmbh Furniertrockner
DE102005019643A1 (de) * 2005-04-26 2006-11-02 Grenzebach Bsh Gmbh Furniertrockner
DE102007018018A1 (de) * 2007-04-17 2008-10-23 Helmut Spielvogel Kontakttrocknung von Messerfurnieren im Bügeltrockner

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112050598B (zh) * 2020-08-28 2021-11-16 泉州台商投资区飞翔机械设计服务中心 一种纺织布印染烘干装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1604908B1 (de) * 1962-04-28 1972-03-23 Robert Hildebrand Trockner fuer endlose Furnierbahnen
DE1629087A1 (de) * 1963-04-19 1971-04-29 Tromag Trockenapp Und Maschb G Bandtrockeneinrichtung,insbesondere fuer Furniere
DE1266233B (de) * 1966-01-08 1968-04-11 Hombak Maschinenfab Kg Walzenlagerung eines Walzentrockners fuer bandfoermiges Gut
DE1604922A1 (de) * 1966-01-12 1971-01-07 Robert Hildebrand Maschb Gmbh Trockner,insbesondere Furniertrockner
DE2441787C2 (de) * 1974-08-31 1984-10-04 Babcock-BSH AG vormals Büttner-Schilde-Haas AG, 4150 Krefeld Bandtrockner für Endlosfurniere
US4483083A (en) * 1982-08-18 1984-11-20 Beloit Corporation Drying and runnability for high speed paper machines
DE3405754A1 (de) 1984-02-17 1985-08-22 Babcock-BSH AG vormals Büttner-Schilde-Haas AG, 4150 Krefeld Furniertrockner fuer messerfurniere

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005047793A1 (fr) 2003-10-21 2005-05-26 Grenzebach Bsh Gmbh Séchoir pour éléments de placage
DE102005010321A1 (de) * 2005-03-03 2006-09-14 Grenzebach Bsh Gmbh Furniertrockner
DE102005019643A1 (de) * 2005-04-26 2006-11-02 Grenzebach Bsh Gmbh Furniertrockner
DE102007018018A1 (de) * 2007-04-17 2008-10-23 Helmut Spielvogel Kontakttrocknung von Messerfurnieren im Bügeltrockner

Also Published As

Publication number Publication date
EP0192207A3 (en) 1987-01-07
EP0192207A2 (fr) 1986-08-27

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