DE640576C - Device to compensate for drying shrinkage when drying veneer tapes - Google Patents

Device to compensate for drying shrinkage when drying veneer tapes

Info

Publication number
DE640576C
DE640576C DEK133350D DEK0133350D DE640576C DE 640576 C DE640576 C DE 640576C DE K133350 D DEK133350 D DE K133350D DE K0133350 D DEK0133350 D DE K0133350D DE 640576 C DE640576 C DE 640576C
Authority
DE
Germany
Prior art keywords
drying
veneer
shrinkage
compensate
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
DEK133350D
Other languages
German (de)
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.)
Krages & Kriete
Original Assignee
Krages & Kriete
Publication date
Priority to DEK133350D priority Critical patent/DE640576C/en
Application granted granted Critical
Publication of DE640576C publication Critical patent/DE640576C/en
Expired legal-status Critical Current

Links

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
    • 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
    • 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
    • F26B2210/16—Wood, e.g. lumber, timber

Landscapes

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

Description

Vorrichtung zum Ausgleich des Trockenschwundes beim Trocknen von Furnierbändern Bei Trocknern mit Förderung des Trockengutes durch Rollen oder endlose Bänder wird bekanntlich das Trockengut dem Trockenraum in fertiggeschnittenen Größen zugeführt. Nach erfolgter Trocknung zeigen die Trockengutstücke, beispielsweise bei den Furnieren, häufig Rißbildungen, die durch spannungshervorrufenden Faserverlauf des Furniers oder Fehler in der Holzschälerei verursacht Werden und im feuchten Zustand der Furniere nur teilweise erkenntlich sind.Device to compensate for drying shrinkage when drying veneer tapes In the case of dryers with conveyance of the dry material through rollers or endless belts It is known that the dry material is fed to the drying room in ready-cut sizes. After drying, the items to be dried, for example in the case of the veneers, show often cracks caused by stress-inducing fiber flow of the veneer or defects are caused in the wood peeling and in the moist state of the veneers are only partially recognizable.

Die Erfindung besteht darin, das Furnier in der Richtung quer zum Verlauf der Holzfaser laufend von der Schälmaschine oder von besonderer Blockrolle in einem Trockner zu trocknen, bei dem die Umfangsgeschwindigkeit der Förderrollen zwischen Furnierein-und -austrittsstelle des Trockners dem Schwinden des feuchten Furnierbandes so angepaßt wird, daß ein Reißen desselben nicht eintreten kann. Die Förderrollen können dabei auch durch andere Fördermittel, wie Kettenglieder oder unterteilte Förderbänder, ersetzt werden.The invention consists in the veneer in the direction transverse to Path of the wood fiber continuously from the peeling machine or from a special block roll to dry in a dryer at which the peripheral speed of the conveyor rollers between the veneer entry and exit point of the dryer the shrinkage of the damp Veneer tape is adjusted so that tearing of the same can not occur. the Conveyor rollers can also be carried out by other means of conveyance, such as chain links or divided conveyor belts, are replaced.

In der Richtung rechtwinklig zum Verlauf der Faser beträgt das Schwinden des feuchten Furniers durchschnittlich 8 %. Das Aufschneiden des Furnierbandes wird nach dem Trocknen unter Berücksichtigung der aufgetretenen Risse vorgenommen. Ohne Vorrichtung zum Ausgleichen des Schwindens würde das Furnierband während des Trockenvorganges stets in bestimmten Längen auseinanderreißen, so daß in diesem Falle die Ausnutzung geringer wäre .als bei Trocknung der auf Maß zugeschnittenen Furnierstücke.The shrinkage is in the direction perpendicular to the course of the fiber of the moist veneer an average of 8%. The cutting of the veneer tape is made after drying, taking into account the cracks that have occurred. Without A device to compensate for the shrinkage would be the veneer band during the drying process always tear apart in certain lengths, so that in this case the utilization would be less than if the veneer pieces cut to size were dried.

Abb. i zeigt die Anordnung hei eitlem fortlaufend arbeitenden Trockner: In diesem Trockner a erhalten die Förderrollen b an der Trocknereintrittsseite c eine nach der Austrittsseite d gleichmäßig abnehmende Umfangsgeschwindigkeit durch entsprechende Drehzahl- bzw. Durchmesseränderung, die dem Schwinden des Furnierbandes h entspricht.Fig. I shows the arrangement of the continuously operating dryer: In this dryer a, the conveyor rollers b receive c on the dryer inlet side a circumferential speed that decreases uniformly towards the exit side d Corresponding speed or diameter change, which causes the shrinkage of the veneer band h corresponds to.

In Abb.2 ist die Anordnung eines Kammertrockners dargestellt. Bei dieser Trocknerart ruht das Furnierband während des Trockenvorganges auf den Förderrollen b. In bestimmten Zeitabständen werden die oberen Förderrollen g abgehoben, unmittelbar anschließend die unteren Förderrollen b gruppenweise im Sinne der Schwindungsrichtung in geringe abgestufte Drehung versetzt und die oberen Förderrollen g wieder gesenkt, so daß ein widerstandsloses Zusammenziehen des Furnierbandes h gegeben ist.The arrangement of a chamber dryer is shown in Fig. at With this type of dryer, the veneer belt rests on the conveyor rollers during the drying process b. The upper conveyor rollers g are lifted off at certain time intervals, immediately then the lower conveyor rollers b in groups in the sense of the shrinkage direction set in a small stepped rotation and the upper conveyor rollers g lowered again, so that a resistance-free contraction of the veneer tape h is given.

Damit die dünneren Furniere durch die Rollenbahn zwangsläufig geführt werden, sind die Rollen b gemäß, der Abb. 3 auf ihrer Länge mit mehreren Nuten ,e versehen, in denen. feststehende Führungsbänder f über die ganze Trocknerlänge angeordnet sind oder rollenbatterieweise umschließende Führungsbänder durch die Rollen b mitgezogen werden.So that the thinner veneers are inevitably guided through the roller conveyor are, the rollers b according to Fig. 3 along their length with several grooves, e provided in which. fixed guide belts f arranged over the entire length of the dryer are or roller battery-wise enclosing guide bands pulled along by the rollers b will.

Claims (2)

PATENTANSPRÜCHE: i. Vorrichtung zum Ausgleich des Trockenschwundes beim Trocknen von Furnierbändern in Trockenkammern, in denen das Furnierband auf Rollen lagert, dadurch gekennzeichnet, daß. das Furnierband in regelmäßigen Zeitabständen vom Druck der oberen Rollen entlastet wird, während gleichzeitig die unteren Rollen im Sinne der Schwindungsrichtung gedreht werden. PATENT CLAIMS: i. Device to compensate for drying shrinkage when drying veneer tapes in drying chambers in which the veneer tape is on Roles stores, characterized in that. the veneer tape at regular intervals the pressure of the upper rollers is relieved, while at the same time the lower rollers be rotated in the sense of the shrinkage direction. 2. Vorrichtung nach Anspruch i, dadurch gekennzeichnet, daß die Förderrollen mit Nuten versehen werden, in welchen Führungsbänder über die ganze Trocknerlänge angeordnet sind.2. Device according to claim i, characterized in that the conveyor rollers are provided with grooves in which Guide belts are arranged over the entire length of the dryer.
DEK133350D Device to compensate for drying shrinkage when drying veneer tapes Expired DE640576C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK133350D DE640576C (en) Device to compensate for drying shrinkage when drying veneer tapes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK133350D DE640576C (en) Device to compensate for drying shrinkage when drying veneer tapes

Publications (1)

Publication Number Publication Date
DE640576C true DE640576C (en) 1937-01-07

Family

ID=7247858

Family Applications (1)

Application Number Title Priority Date Filing Date
DEK133350D Expired DE640576C (en) Device to compensate for drying shrinkage when drying veneer tapes

Country Status (1)

Country Link
DE (1) DE640576C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2463668A1 (en) * 1979-08-20 1981-02-27 Meinan Machinery Works METHOD AND APPARATUS FOR DRYING PLASTER SHEET FOR PLATE BACK
DE3050609C2 (en) * 1979-08-20 1984-12-06 Meinan Machinery Works, Inc., Ohbu, Aichi Device for drying a veneer sheet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2463668A1 (en) * 1979-08-20 1981-02-27 Meinan Machinery Works METHOD AND APPARATUS FOR DRYING PLASTER SHEET FOR PLATE BACK
DE3031217A1 (en) 1979-08-20 1981-03-26 Meinan Machinery Works, Inc., Ohbushi, Aichi METHOD AND DEVICE FOR DRYING A VENEER LEAF
DE3050609C2 (en) * 1979-08-20 1984-12-06 Meinan Machinery Works, Inc., Ohbu, Aichi Device for drying a veneer sheet

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