EP3242781B1 - Procédé de fabrication de bois en placage stratifié - Google Patents

Procédé de fabrication de bois en placage stratifié Download PDF

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Publication number
EP3242781B1
EP3242781B1 EP15817859.0A EP15817859A EP3242781B1 EP 3242781 B1 EP3242781 B1 EP 3242781B1 EP 15817859 A EP15817859 A EP 15817859A EP 3242781 B1 EP3242781 B1 EP 3242781B1
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EP
European Patent Office
Prior art keywords
panels
stack
layers
panel
stacking sequence
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Not-in-force
Application number
EP15817859.0A
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German (de)
English (en)
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EP3242781A1 (fr
Inventor
Ralf Pollmeier
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/10—Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G1/00—Machines or devices for removing knots or other irregularities or for filling-up holes

Definitions

  • the invention relates to a method for the production of laminated veneer lumber, in which panels of a veneer are inspected for defects and glue-free panels are glued, stacked in several layers and pressed.
  • veneer webs some of which have significant defects. Typical causes of such defects in the veneer are, for example, knotholes or bumps in the peeled trunk. In veneer lumber, these imperfections can lead to weakening of the material as well as mismatching, that is, the successive veneer sheds are not completely glued together due to the imperfection of gaps and therefore do not adhere well to one another.
  • the object of the invention is therefore to provide a method which allows a production of laminated veneer lumber with less waste.
  • This object is achieved according to the invention in that for panels which are not free of defects, at least if the defects do not overwrite a certain size, the locations of the defects in the stack are calculated and stored and a stacking sequence, in which the sheets are stacked is determined depending on the stored locations of the defects in a number of layers of the already stacked sheets.
  • the panel in question may initially be in a clipboard are stored, and in their place, the next supplied panel is inspected for defects and optionally placed on the Staple.
  • the sheet initially stored in the clipboard can then be added to the stack at a later time if multiple layers of sheets have been piled free of defects at the location where the defect is located.
  • An alternative possibility is that multiple stacks are formed simultaneously and the flawed panel is added to each stack where the condition that no flaws should be superimposed is most likely to be met.
  • the laminated veneers are pressed under heat.
  • the veneers can come during pressing to a flow process by which the defects are largely closed. According to an expedient development of the invention, therefore, the conditions during pressing are adjusted so that such flow processes are favored. It is particularly advantageous if the laminated veneers are preheated prior to entry into the press, for example by means of microwave radiation.
  • a dryer 10 are dried in the panels 12 of a veneer preferably in several floors in a continuous process, one arranged on a conveyor track 14 for the veneer panels
  • Defect scanner 16 a Auskappvorraum 18, with the larger defects can be capped and possibly the remaining veneer pieces can be reassembled
  • a gluing station 20 a stacker 22 movably disposed above the conveyor track 14, a preheating station 24, and a press 26.
  • the veneers are dried to an average mean humidity of 4 to 8%, whereby the setpoint value of the residual moisture can be maintained with an accuracy of +/- 0.5 percentage points.
  • the dried panels 12 are then - optionally after storage in a storage, not shown - isolated and transported in succession on the conveyor track 14. In doing so, they pass under the defect scanner 16, which extends over the entire width of the conveyor track, and thus is able to take a complete picture of the veneer sheet.
  • a connected electronic control unit 28 contains image processing software with which the defects can be located and optionally classified according to their size and shape. For each panel 12, the location coordinates of the defects found in the plane of the conveyor track 14 and preferably also data on the shape and extent of the defects are stored. In the example shown, it is also decided in the control unit 28 whether the extent of a defect is so great that it can no longer be tolerated. In that case, the defect in question is cut off with the aid of the extraction device 18.
  • the inspection for defects and the Auskappen faulty veneer panels can also be done before the caching.
  • the sorting out of the faulty veneer sheets and the cutting off are then preferably carried out in a separate workstation, in which the pieces remaining after cutting out are reassembled into new, useful, sheets and stored until they are fed back into the regular process.
  • the panels 12 are glued and, with the aid of the stacker 22, they are then staggered to form together a stack 30 in the form of a continuous strand of veneer.
  • the stack 30 may for example consist of twelve veneer layers, although in the simplified drawing in Fig. 1 only five layers are shown.
  • the individual panels are each offset by about 150 mm from each other.
  • the stacker 22 is movable along the stack 30 and, under control of the control unit 28, picks up a glued panel from the gluing station 20 and sets it down at the next free location of the stack 30.
  • a tablet is placed in the uppermost layer of the stack.
  • next panel would then placed on the drawing in the left end of the strand directly on the conveyor track 14 so that it rests against the existing trailing edge 32 of the strand.
  • the next panels would then be incrementally applied from left to right progressively until the topmost tier is reached and a new cycle begins.
  • the control unit 28 stores not only the locations of the defects within the panels, but also the location in which the panel in question is stored in the stack 30. Thus, the control unit 28 is also able to calculate the location coordinates of the defects in an absolute coordinate system attached to the stack 30. As a result, the control unit 28 may also determine whether two defects located in different layers of the stack 30 overlap each other.
  • the panel in question is initially not added to the stack 30, but deposited in a clipboard 34, and in its place the stack is replaced by the next one Beleimungsstation 20 added to the upcoming panel.
  • this panel is picked up from the clipboard 34 and added to the stack. In this way it can be achieved that never two defects lie directly above each other. In addition, it can also be achieved that overlapping defects either do not occur at all or are separated from one another by a certain minimum number of defect-free veneer layers.
  • the sheets 12 stacked to the stack 30 are preheated to a temperature of about 80 ° C., for example by means of microwave radiation. Thereafter, the stack 30 is pressed in the press 26 in a continuous process between press plates, which in turn have a temperature of about 140 to 220 ° C.
  • the veneer sheets are pressed into a (endless) laminated veneer lumber panel.
  • the heat introduced from the outside also heats the veneer plies in the platen core to a temperature of 105 ° C or more at which the glue (e.g., a phenolic resin) cures.
  • a high-quality veneer plywood panel free of weak points can also be produced if there are defects in the individual veneer panels with a size of, for example, 8 cm or more.
  • FIG. 2 For example, an end portion of the stack 30 is shown on an enlarged scale in plan view.
  • two panels 12a At the right end you look at two panels 12a, which are in the uppermost layer of the stack. To the left of this one can see the end portion of a panel 12b projecting in the second highest position due to the offset between the panels, and subsequently a panel 12c, which is also in the second highest position and has a defect 36.
  • a panel 12c which is also in the second highest position and has a defect 36.
  • Plates 12d in the lowermost layers of the stack One of them has a further defect 38.
  • FIG. 2 Another panel 12e is in Fig. 2 shown separately, in the longitudinal position in which they should actually next be added to the stack 30, namely so that it rests on the two panels 12b and 12c and abutting on the last panel 12a.
  • the panel 12e also has a flaw 40, and the control unit 28 recognizes that the flaws 36 and 40 would overlap each other if the panel 12e were dropped as planned. In this situation, therefore, the control unit 28 changes the stacking sequence so that the panel 12e is first stored in the clipboard 34 and replaced with another panel.
  • the defect 44 overlaps with the defect 36, but is separated therefrom by two defect-free veneer layers.
  • the flaws 46 also form a pair of overlapping flaws between which there are several flawless plies.
  • the stacking sequence is always selected by the control unit 28 so that there is always a certain minimum number n of (at this point) veneer layers between two overlapping defects, where the number n may also depend on the size of the defects in question.
  • control unit 28 by suitably changing the stacking sequence, also ensures that the defects or at least the larger imperfections are preferably located in the middle layers of the strand 30.
  • the control unit 28 As the strand is pressed between the heated press plates of the press 26, the heat gradually spreads from the upper and lower layers to the middle layers. In the middle layers, therefore, more time remains within which the material can flow and close the flaws before the phenolic resin cures and prevents further flow.
  • the plant for the production of laminated veneer lumber boards downstream of the defect scanner 16 or at the latest downstream of the gluing station 20 forks into two or more parallel production lines, in each of which a strand-like stack 30 is formed from veneer panels.
  • These parallel production lines are operated by a common stacker 22 or possibly also by several stackers. If there were an overlap of imperfections, then, in addition to the option to place the panel concerned in the clipboard 34, there is also the option of placing this panel on another stack in one of the other production lines.
  • step S1 a panel 12 is scanned by the defect scanner 16 and it is checked whether this panel has a defect. If this is not the case, the tablet is placed in step S2 on the stack provided for them (stack 1). Otherwise, it is decided in step S3 on the basis of the size of the defect, whether this defect is still tolerable or must be capped in step S4. If it is tolerable, then in step S5 the position that would occupy this defect in the stack (stack 1) is calculated.
  • step S6 it is checked on the basis of the calculated position of the defect whether there is already another defect in the last n-layers of the stack 1 which would overlap with the defect in the new sheet to be added. If this is not the case, a branch is made to step S2, and the board is added to the stack 1 as planned.
  • step S7 it is calculated which position the defect of the newly added sheet would occupy in another stack (stack 2) in a parallel production line.
  • step S8 it is then checked whether there is also a defect in this stack in the last n-layers which would overlap with the new defect. If there are no overlapping defects in the stack 2, the panel will be in step S9 stored on the stack 2. Otherwise, it is stored in the clipboard 34 in step S10.
  • the above-described procedure is repeated, but preferably the rolls of the stacks 1 and 2 are exchanged to ensure that normally (no defects) both production lines are operated evenly.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)

Claims (8)

  1. Procédé pour fabriquer du bois de placage stratifié, dans lequel des défauts sont recherchés dans des panneaux (12) d'un placage et les panneaux exempts de défauts sont encollés, empilés en plusieurs couches et pressés, caractérisé en ce que pour les panneaux qui ne sont pas exempts de défauts, au moins lorsque les défauts ne dépassent pas une taille déterminée, les emplacements des défauts dans l'empilement (30) sont calculés et enregistrés et une succession d'empilements est déterminée dans laquelle les panneaux sont empilés, en fonction des emplacements enregistrés des défauts présents dans un certain nombre de couches des panneaux déjà empilés.
  2. Procédé selon la revendication 1, dans lequel pour un panneau présentant un défaut qui ne dépasse pas la taille prédéterminée, il est vérifié s'il serait recouvert d'un défaut de l'un des panneaux déjà empilés dans le nombre indiqué de couches et, si tel est le cas, la succession d'empilements est changée.
  3. Procédé selon la revendication 2, dans lequel le changement de la succession d'empilements consiste à stocker temporairement les panneaux dans une pile intermédiaire (34) et de les insérer à un moment ultérieur dans la succession d'empilements.
  4. Procédé selon la revendication 3, dans lequel le changement de la succession d'empilements consiste à insérer les panneaux dans une succession d'empilements pour un autre empilement.
  5. Procédé selon l'une des revendications précédentes, dans lequel le nombre de couches qui sont prises en compte pour déterminer la succession d'empilements, dépend de la taille du défaut.
  6. Procédé selon l'une des revendications précédentes, dans lequel l'empilement (30) formé à partir des panneaux (12) a la forme d'une bande sans fin, dans laquelle les panneaux sont décalés les uns par rapport aux autres dans des couches successives dans une direction longitudinale de la bande.
  7. Procédé selon l'une des revendications précédentes, dans lequel l'empilement (30) est pressé sous l'action de la chaleur et la succession d'empilements est déterminée de sorte que les panneaux présentant des défauts ou au moins les panneaux présentant des défauts qui ont une certaine taille minimale sont de préférence déposés dans les couches intérieures de l'empilement (30).
  8. Procédé selon l'une des revendications précédentes, dans lequel l'empilement (30) est pressé sous l'action de la chaleur dans une presse (26) et les panneaux (12) sont préchauffés avant l'entrée dans la presse (26) .
EP15817859.0A 2015-01-05 2015-12-23 Procédé de fabrication de bois en placage stratifié Not-in-force EP3242781B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015100033.4A DE102015100033A1 (de) 2015-01-05 2015-01-05 Verfahren zur Herstellung von Furnierschichtholz
PCT/EP2015/081113 WO2016110414A1 (fr) 2015-01-05 2015-12-23 Procédé de fabrication de bois en placage stratifié

Publications (2)

Publication Number Publication Date
EP3242781A1 EP3242781A1 (fr) 2017-11-15
EP3242781B1 true EP3242781B1 (fr) 2019-02-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15817859.0A Not-in-force EP3242781B1 (fr) 2015-01-05 2015-12-23 Procédé de fabrication de bois en placage stratifié

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EP (1) EP3242781B1 (fr)
DE (1) DE102015100033A1 (fr)
WO (1) WO2016110414A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015122943A1 (de) * 2015-12-30 2017-07-06 Hanses Sägewerkstechnik GmbH & Co. KG Verfahren und Vorrichtung zum Legen von Furniertafeln
FI129218B (fi) * 2016-11-22 2021-09-30 Metsaeliitto Osuuskunta Pinnoitettu monikerroksinen puulevy ja menetelmä runkolevyn valmistamiseksi
DE102017104557A1 (de) 2017-03-06 2018-09-06 Hanses Sägewerkstechnik GmbH & Co. KG Verfahren zur Herstellung von Furnierschichtholz
CN109203135B (zh) * 2018-10-27 2020-12-01 日照市冠通木业有限公司 一种木材表面填补装置
CN112405735A (zh) * 2019-08-21 2021-02-26 庆镒机械实业有限公司 兼具多元化功能的板材拼板自动修补方法及其设备

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GB421979A (en) * 1933-06-29 1934-12-31 Klinger Johann Process for the manufacture of laminated joinery members
DE2124086A1 (de) * 1971-05-14 1972-11-16 Browne, Morton Ross, Newmarket (Neuseeland) Verfahren und Vorrichtung zur Herstellung von Nutzholzerzeugnissen
US3942021A (en) * 1973-08-30 1976-03-02 National Association Of Furniture Manufacturers, Inc. Apparatus for optimizing the yield of usable pieces from boards and the like
DD208322A1 (de) * 1982-09-08 1984-05-02 Max Eichhorn Verfahren zur homogenisierung und veredelung von rohhoelzern
US4934228A (en) * 1989-01-13 1990-06-19 U.S. Natural Resources, Inc. System for diverting veneer sheets having offsize defects
FI97645C (fi) * 1993-03-15 1997-01-27 Finnforest Oy Puuviilujen lujuuslajittelu
DE10201038A1 (de) * 2002-01-12 2003-07-31 Achim Moeller Schichtwerkstoff
US20030192412A1 (en) * 2002-04-10 2003-10-16 Siempelkamp Handling Systeme Gmbh & Co. Device for marking and analyzing defects in a system for cutting boards to size made of wood at least in part
US6865800B2 (en) * 2003-01-29 2005-03-15 Corvallis Tool Co. Production of laminated veneer support beams
US7438096B2 (en) * 2006-03-09 2008-10-21 Corvallis Tool Company Veneer composer
JP2008265156A (ja) * 2007-04-20 2008-11-06 Matsushita Electric Works Ltd 合板の製造方法及び合板
DE102009022335A1 (de) * 2009-05-13 2010-11-18 GreCon Dimter Holzoptimierung Süd GmbH & Co. KG Verfahren zur Herstellung von Holzplatten
FI125486B (fi) * 2011-01-25 2015-10-30 Raute Oyj Vaneriviilujen paikkauslaitteisto

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Publication number Publication date
EP3242781A1 (fr) 2017-11-15
WO2016110414A1 (fr) 2016-07-14
DE102015100033A1 (de) 2016-07-07

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