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EP0152576A2 - Procédé et appareil pour séchage de placages de lame - Google Patents

Procédé et appareil pour séchage de placages de lame Download PDF

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Publication number
EP0152576A2
EP0152576A2 EP84115044A EP84115044A EP0152576A2 EP 0152576 A2 EP0152576 A2 EP 0152576A2 EP 84115044 A EP84115044 A EP 84115044A EP 84115044 A EP84115044 A EP 84115044A EP 0152576 A2 EP0152576 A2 EP 0152576A2
Authority
EP
European Patent Office
Prior art keywords
rollers
dryer according
veneer dryer
veneer
drums
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.)
Granted
Application number
EP84115044A
Other languages
German (de)
English (en)
Other versions
EP0152576B2 (fr
EP0152576B1 (fr
EP0152576A3 (en
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6228041&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0152576(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Babcock BSH AG filed Critical Babcock BSH AG
Publication of EP0152576A2 publication Critical patent/EP0152576A2/fr
Publication of EP0152576A3 publication Critical patent/EP0152576A3/de
Application granted granted Critical
Publication of EP0152576B1 publication Critical patent/EP0152576B1/fr
Publication of EP0152576B2 publication Critical patent/EP0152576B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to a veneer dryer for sliced veneers according to the preamble of patent 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, a higher pressing pressure - and thus a better smoothing effect - can be achieved 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 between see the roller pairs firmly clamped. 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 problem-free.
  • the disadvantage of this is 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 to remove the waves that occurred during drying.
  • a veneer dryer of the generic type in which the veneers are guided in a loop between belts around rollers which are offset in zigzags.
  • the goods are stored between two endless, smooth-rolled wire mesh belts, which are put under considerable tension by an articulated arrangement of the rollers, which are mounted in zigzags. This tension exerts a smoothing pressure on the veneer lying between the tapes.
  • the invention has for its object to provide a veneer dryer for sliced veneers, which makes it possible to dry sliced veneers with significantly improved quality.
  • 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 (curling effect).
  • the feature of claim 4 ensures free shrinkage without the veneer slipping.
  • the differential speed according to claim 5 reduces the occurrence of cracks.
  • Veneers that have been dried with the veneer dryers according to claims 3, 6, 7 and 8 have a particularly good quality, with the Embodiments according to claims 7 and 8 cost-effectively increased performance.
  • the claims 9, 18 and 19 contain structurally particularly advantageous embodiments.
  • claim 14 shows a simple construction for heating the surface of the rollers.
  • the embodiment according to claim 15 is particularly advantageous since not only the bottoms of the drum are saved by the external storage, but also the fixed heating system inside the drum is much easier to install and to supply.
  • the feature of claim 16 additionally enables the drum surface facing side of the veneer sheet to be directly loaded with drying medium during the circulation.
  • the veneer dryer according to the invention consists of a sealed drying chamber 1, which is constructed in a modular manner from several fields 1.1 - 1.9. The number of fields varies depending on the operational use. At the dryer entrance there is an inlet field 2, and a transfer field 3 connects to the last dryer field 1.9. The transfer field 3 is connected to a cooling field 4 via a conveyor system 5, followed by a collecting device, not shown.
  • Each dryer field 1.1 - 1.9 has a circulating air fan 6 and a heat exchanger, not shown, with controllable heating medium supply; Heating medium is e.g. Hot water, steam etc. There is also an exhaust air chimney 7 on the drying chamber 1, which is connected to the interior of the chamber via a controllable shut-off valve 8. With these devices, the required dry climate can be established in each field 1.1 - 1.9.
  • the conveyor system for the veneers through the drying chamber 1 is a belt conveyor which consists of two endless belts 9.1, 9.2.
  • Coming from the field 1.5 in a horizontal direction lay down on the roller 10.1 at the bottom and wrap it around an arc of around 60 °.
  • the rollers 10.4 to 10.8 are wrapped alternately at the top and bottom, the carrier tape 9.2 and the cover tape 9.1 alternately resting on the surface of the respective roller.
  • the belts run obliquely downwards from the last roller 10.8 to the deflection rollers 13.1 and 13.2.
  • the conveying path is zigzag, for example like a rounded sawtooth curve or similar to a sine curve.
  • the length of the entire conveyor line in the dryer is slightly more than 20 m in the exemplary embodiments shown.
  • the proportion of the straight conveyor section in front of the first roller 10.1 is approximately 10 m, ie almost 50% of the total distance.
  • the curved conveying sections (without the straight-line sections in between) add up to just under 7 m of track length, i.e. around 30% of the total conveying section and around 60% of the conveying section in this area.
  • Embodiments are also possible in which deflection devices are arranged along the entire conveying path. Then the share of the diverted conveyor section increases to over 40%. A proportion of 50-70% has proven to be favorable in these forms.
  • each belt 9.1, 9.2 is deflected away from one another by deflection rollers 13.1, 13.2 and, supported on rollers 14.1, 14.2, are returned to the dryer entrance.
  • deflection rollers 15.1, 15.2 they are part of the inlet field 2, in which each belt 9.1, 9.2 also passes through a tensioning device 16.1, 16.2, with which the tensile stress acting on it can be adjusted.
  • the tensioning device 16 consists of a deflection roller, the position of which can be changed hydraulically.
  • the straps 9.1, 9.2 are made of non-stretchable material. It is entirely possible that they have a certain elasticity if it is ensured that they are able to produce 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. Furthermore, the tapes are designed so that they can slide back and forth on the veneer without creating markings. Flat spiral wire mesh tapes and spiral tapes made from round wire have proven themselves in practice.
  • the belts 9.1, 9.2 are driven by the rollers 10 or drums 11, which are connected to the drive 12.
  • a differential speed of 2% is set between the belts 9.1, 9.2.
  • the rollers 10 or drums 11 are all of the same size, their number varies depending on the operational use; in the present exemplary embodiments, there are eight each.
  • the arrangement takes place one after the other, the axes of rotation lying in a horizontal plane.
  • Two rollers 10 or drums 11 are located in one field. To save space, it is also possible to arrange the rollers 10 or drums 11 at different heights; e.g. so that the axes of rotation are partly in a second, higher horizontal plane.
  • FIGS. 1 and 2 have different drive systems: pins are fastened to the end faces of the rollers 10 and are rotatably mounted in a stand. Every second roller 10.2, 10.4, 10.6, 10.8 - they are each rotated on the upper side by the belts 9.1, 9.2 - is driven by a common chain 17 engaging the pin (FIG. 3).
  • the drums 11 rest on partially driven rollers 18, the drums 11.1, 11.3 etc., which are covered by the belts 9.1, 9.2 on their underside, being supported on their upper side by additional rollers 19.
  • the rollers 18, 19 roll on races, not shown, which are attached to the drum ends.
  • braking devices with which both the belt tension and the differential speed between the belts 9.1, 9.2 can be regulated by braking.
  • two rollers 10.3, 10.5 have such braking devices in the form of disc brakes 20.1, 20.2.
  • the belts 9.1, 9.2 run in a straight line for a piece b during their mutual mutual rotation around the rollers 10 or drums 11 on the transition path from one roller 10 or drum 11 to the next.
  • This distance b must be at least half of the maximum veneer width, in the present example it is 500 mm with a 1,000 mm maximum veneer width. This is achieved in that two successive rollers 10 or drums 11 in the transport direction do not directly adjoin one another, but are arranged at a certain distance from one another.
  • the drying chamber 1 there are nozzle boxes 21 along the conveying path of the veneer, from which hot air is blown essentially vertically onto both sides of the veneer.
  • the nozzle boxes 21 are arranged in the fields 1.6-1.9 both above and below the rollers 10 along an arc of a circle.
  • the nozzle boxes 21 are fixedly attached inside the drums 11.
  • the drums 11 have no bottoms, and their walls are also provided with holes. Therefore, the hot air can be blown with the inner nozzle boxes 21 through the drum walls and the inner conveyor belt on the veneers.
  • Other heating systems can also be installed inside the drums 11, e.g. oil or gas burners with which the drums are heated directly.
  • the conveying path of the veneers runs straight through the first fields 1.1-1.5.
  • 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 the inlet field 2. 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 dimensioned so that the veneers are not prevented from shrinking during drying are.
  • the veneers are subjected to hot air from the nozzle boxes 21 and thus pre-dried, preferably to the point of fiber saturation.
  • the veneers are guided on a loop-shaped path through the remaining dryer.
  • the forced guidance along an arcuate path creates a radial pressing pressure that presses vertically on the veneer surface: the outer belt (in the first roller 10.1 or first drum 11.1, the lower belt 9.2) presses the veneer against the inner belt, which in turn lies on the roller 10.1 or drum 11.1.
  • the veneer is smoothed by the high pressure, free shrinking is not possible in this phase due to the high pressure.
  • the tapes 9.1, 9.2 are designed so that there are no marks on the veneer.
  • the contact pressure can be adjusted according to the respective requirements with the tensioning devices 16.1, 16.2 via the tension of the belts 9.1, 9.2.
  • the differential speed between the belts 9.1, 9.2 and the distribution of the tension in the dryer can be adjusted with the help of the braking devices 20.1, 20.2.
  • the belts 9.1, 9.2 in the transition piece between two rollers 10 or drums 11 each run straight for a distance b. There is no contact pressure during the straight line guidance - with the exception of the pressure caused by the component of the shroud weight vertical to the conveyor - on; 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 60 degrees. It has been shown that because of the tendency of the veneer sheets to contract, this angle cannot be increased arbitrarily.
  • 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 10 or drums 11 are rotated alternately at the top and bottom 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 9.1, 9.2 against one another, since the respective outer belt remains as a function of the different rotation radii.
  • This movement of the belts 9.1, 9.2 smoothes the veneers.
  • the strength of the relative movement against each other can be influence by the thickness of the conveyor belts 9.1, 9.2, since their amount depends on the different orbital radii, and thus on the belt thickness.
  • the smoothing is supported by the difference in speed between the two belts 9.1, 9.2, which can be influenced by the braking devices 20.1, 20.2.
  • a Veneer sheet and its inner side - it is covered by the roller wall - the rollers 10 on the opposite side of the circulation also blown with hot air from nozzle boxes 21 and 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 21 mounted in the drums 11 precise metering and guidance of the hot air flow is possible.
  • the veneers leave the drying chamber 1 via the transfer field 2, from where they are conveyed into the cooling field 6 by the conveyor system 5. There they are cooled and then collected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP84115044A 1984-01-17 1984-12-10 Procédé et appareil pour séchage de placages de lame Expired - Lifetime EP0152576B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3405754 1984-02-17
DE3405754A DE3405754A1 (de) 1984-02-17 1984-02-17 Furniertrockner fuer messerfurniere

Publications (4)

Publication Number Publication Date
EP0152576A2 true EP0152576A2 (fr) 1985-08-28
EP0152576A3 EP0152576A3 (en) 1985-11-13
EP0152576B1 EP0152576B1 (fr) 1988-03-02
EP0152576B2 EP0152576B2 (fr) 1993-10-27

Family

ID=6228041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84115044A Expired - Lifetime EP0152576B2 (fr) 1984-01-17 1984-12-10 Procédé et appareil pour séchage de placages de lame

Country Status (3)

Country Link
US (1) US4654981A (fr)
EP (1) EP0152576B2 (fr)
DE (2) DE3405754A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0192207A2 (fr) 1985-02-19 1986-08-27 BABCOCK-BSH AKTIENGESELLSCHAFT vormals Büttner-Schilde-Haas AG Séchoir pour bois de placage
DE3706353A1 (de) * 1987-02-27 1988-09-08 Keller Gmbh & Co Kg Einrichtung zum trocknen von furnieren
EP0290056A3 (en) * 1987-05-08 1989-07-12 Angelo Cremona & Figlio S.P.A. Improved opposed belt drier for wood veneers improved opposed belt drier for wood veneers
DE3915516A1 (de) * 1988-05-20 1989-11-30 Cremona Angelo & Figlio Trockner fuer messerfurniere
WO2000053984A1 (fr) 1999-03-11 2000-09-14 Babcock-Bsh Gmbh Procede de sechage de plaques de bois de placage et dispositif de sechage associe
DE19837048C2 (de) * 1998-08-17 2000-11-30 Babcock Bsh Gmbh Düsenkasten für Durchlauftrockner, insbesondere für Furniertrockner

Families Citing this family (22)

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Publication number Priority date Publication date Assignee Title
US6049999A (en) * 1987-02-13 2000-04-18 Beloit Technologies, Inc. Machine and process for the restrained drying of a paper web
US5507104A (en) * 1987-02-13 1996-04-16 Beloit Technologies, Inc. Web drying apparatus
US5404653A (en) * 1987-02-13 1995-04-11 Beloit Technologies, Inc. Apparatus for drying a web
US5062216A (en) * 1987-08-14 1991-11-05 Champion International Corporation Single tiered multi-cylinder paper dryer apparatus
USD320105S (en) 1990-06-19 1991-09-17 Beloit Corporation Web drying section
US5062218A (en) * 1990-10-09 1991-11-05 David R. Webb Co., Inc. Screen dryer
IT1249053B (it) * 1991-05-22 1995-02-11 Cremona Angelo & Figlio Impianto con trasportatore a nastri per l'essiccazione di pannelli di legno
DE4213690C2 (de) * 1992-04-25 1994-11-17 Babcock Bsh Ag Verfahren zum Trocknen und gleichzeitigen Glätten von Furnierblättern
DE29511405U1 (de) * 1995-07-14 1996-11-14 BABCOCK-BSH AKTIENGESELLSCHAFT, 47829 Krefeld Trockner für durchlaufende Furnierblätter
US5915813A (en) * 1996-05-21 1999-06-29 Fort James Corporation Apparatus and method for drying a wet web and modifying the moisture profile thereof
US6108942A (en) * 1998-07-20 2000-08-29 Fezer S.A. Industrias Mecanicas Opposed belt drying apparatus for sliced wood veneers
DE19926836A1 (de) * 1999-06-12 2000-12-14 Voith Sulzer Papiertech Patent Verfahren und Vorrichtung zur Trocknung
FR2836157B1 (fr) * 2002-02-19 2004-04-09 Usinor Procede de nettoyage de la surface d'un materiau enduit d'une susbstance organique, generateur et dispositif de mise en oeuvre
DE102004040552B4 (de) * 2004-08-21 2007-02-08 Grenzebach Bsh Gmbh Trockner für Furnierblätter
DE102005010321A1 (de) * 2005-03-03 2006-09-14 Grenzebach Bsh Gmbh Furniertrockner
DE102007018018A1 (de) * 2007-04-17 2008-10-23 Helmut Spielvogel Kontakttrocknung von Messerfurnieren im Bügeltrockner
US7946321B2 (en) * 2007-04-24 2011-05-24 Meinan Machinery Works, Inc. Method of holding a veneer sheet
CN102211341B (zh) * 2011-04-21 2014-10-01 牡丹江木工机械（厂）有限责任公司 干燥段和冷却段网带独立的网带式薄木干燥机
CN108592585A (zh) * 2016-06-25 2018-09-28 宁波恒进自动化技术有限公司 一种气浮法与摆动法结合的高效节能的可升降装置
US9908342B1 (en) 2017-02-26 2018-03-06 Ricoh Company, Ltd. Concentric arrangement of web conditioning modules in a dryer of a print system
DE102020004455A1 (de) 2020-07-23 2022-01-27 Grenzebach Bsh Gmbh Trockner zum Trocknen von Furnierplatten
CN118500091B (zh) * 2024-07-16 2024-11-15 江苏青昀新材料有限公司 一种闪蒸医用防护片材以及红外烘干设备

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US2671279A (en) * 1949-11-08 1954-03-09 J O Ross Engineering Corp Drier
US3199213A (en) * 1961-07-12 1965-08-10 Crown Zellerbach Canada Ltd Method of changing the moisture content of wood
US3280476A (en) * 1963-01-25 1966-10-25 Hildebrand Robert Web drying apparatus
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
DE1729208B2 (de) * 1967-03-04 1975-06-05 Robert Hildebrand, Maschinenbau Gmbh, 7446 Oberboihingen Trockner für Furniere, Pappe o.dgl
BE758975A (fr) * 1968-02-14 1971-04-30 Engelmann Walter Organe de serrage pour pieces cylindriques lisses.
US3896559A (en) * 1973-03-28 1975-07-29 Martin Jean Marie Michel Machine for drying by contact veneers obtained by peeling or slicing wood
US3956832A (en) * 1974-09-13 1976-05-18 Beloit Corporation Web dryer arrangement
FR2341442A1 (fr) * 1976-02-19 1977-09-16 Lemaire & Cie Perfectionnement aux calandres pour le traitement thermique de produits de faible epaisseur
US4297794A (en) * 1977-08-02 1981-11-03 Ingersoll-Rand Company Paper sheet dryer
US4473099A (en) * 1979-08-20 1984-09-25 Masaru Koike Method and apparatus for drying veneer sheet
DE3030272C2 (de) * 1980-08-09 1982-09-16 Babcock-BSH AG vormals Büttner-Schilde-Haas AG, 4150 Krefeld Anlage zum Trocknen von Furnieren

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0192207A2 (fr) 1985-02-19 1986-08-27 BABCOCK-BSH AKTIENGESELLSCHAFT vormals Büttner-Schilde-Haas AG Séchoir pour bois de placage
EP0192207A3 (en) * 1985-02-19 1987-01-07 Babcock-Bsh Aktiengesellschaft Vormals Buttner-Schilde-Haas Ag Veneer dryer
DE3706353A1 (de) * 1987-02-27 1988-09-08 Keller Gmbh & Co Kg Einrichtung zum trocknen von furnieren
EP0290056A3 (en) * 1987-05-08 1989-07-12 Angelo Cremona & Figlio S.P.A. Improved opposed belt drier for wood veneers improved opposed belt drier for wood veneers
US4862600A (en) * 1987-05-08 1989-09-05 Angelo Cremona & Figlio S.P.A. Opposed belt drier for wood veneers
DE3915516A1 (de) * 1988-05-20 1989-11-30 Cremona Angelo & Figlio Trockner fuer messerfurniere
DE19837048C2 (de) * 1998-08-17 2000-11-30 Babcock Bsh Gmbh Düsenkasten für Durchlauftrockner, insbesondere für Furniertrockner
WO2000053984A1 (fr) 1999-03-11 2000-09-14 Babcock-Bsh Gmbh Procede de sechage de plaques de bois de placage et dispositif de sechage associe
US6581300B1 (en) 1999-03-11 2003-06-24 Babcock-Bsh Gmbh Method for drying veneer and corresponding drying device

Also Published As

Publication number Publication date
EP0152576B2 (fr) 1993-10-27
DE3405754A1 (de) 1985-08-22
DE3469590D1 (en) 1988-04-07
EP0152576B1 (fr) 1988-03-02
EP0152576A3 (en) 1985-11-13
US4654981A (en) 1987-04-07

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