EP3242781A1 - Verfahren zur herstellung von furnierschichtholz - Google Patents
Verfahren zur herstellung von furnierschichtholzInfo
- Publication number
- EP3242781A1 EP3242781A1 EP15817859.0A EP15817859A EP3242781A1 EP 3242781 A1 EP3242781 A1 EP 3242781A1 EP 15817859 A EP15817859 A EP 15817859A EP 3242781 A1 EP3242781 A1 EP 3242781A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- panels
- stack
- defects
- layers
- stacking sequence
- 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
Links
Classifications
-
- 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.
- these imperfections can lead to weakening of the material as well as misalignments, that is, the successive veneer shops 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 specific size, the locations of the defects in the stack are calculated and stored and a stack following is obtained. ge in which the panels are stacked, is determined depending on the stored locations of the defects in a number of layers of the already stacked panels.
- 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 layered veneers are pressed under heat.
- a suitable temperature and humidity The content of the veneers during pressing can lead to a flow process which largely closes the imperfections. 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.
- Fig. 1 is a block diagram of a plant for the production of laminated veneer lumber
- Figure 2 is a strand of staggered stacked veneers in plan view.
- Fig. 3 is a section along the line III - III in Fig. 2;
- FIG. 4 shows a flowchart for explaining the essential steps of the method according to the invention.
- the plant shown schematically in FIG. 1 for the production of laminated veneer lumber has in sequence the following stations from left to right: a dryer 10, in which panels 12 of a veneer are preferably dried in several stages in a continuous process, one on a conveyor track 14 for the veneer panels arranged 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.
- the control unit 28 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 work station, in which the pieces remaining after the cutting out are reassembled and stored again into new, useful, sheets 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 tion 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. In the situation shown in Fig. 1, a panel is being deposited 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 preheating station 24 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 applied from the outside also heats the veneer layers in the core of the board to a temperature of 105 ° C or more at which the glue (eg a phenolic resin) hardens.
- FIG. 2 an end portion of the stack 30 is shown on an enlarged scale in plan view.
- two panels 12a which are in the uppermost layer of the stack.
- 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 shown separately in Fig. 2, in the longitudinal position in which it should actually be added next to the stack 30, namely so that it rests on the two panels 12b and 12c and on impact at the last Plate 12a is present.
- 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 stacking sequence is always selected by the control unit 28 so that there is always a certain minimum number n of (in this place) veneer layers between two overlapping defects, where the number n may also depend on the size of the defects in question.
- the control unit 28 also ensures that the defects or at least the larger imperfections are preferably located in the middle layers of the strand 30.
- 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.
- 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 procedure described above is repeated, but preferably the roles of the stacks 1 and 2 are exchanged to ensure that normally (no defects) both production lines are operated evenly.
Landscapes
- 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)
Abstract
Description
Claims
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 (de) | 2015-01-05 | 2015-12-23 | Verfahren zur herstellung von furnierschichtholz |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3242781A1 true EP3242781A1 (de) | 2017-11-15 |
EP3242781B1 EP3242781B1 (de) | 2019-02-20 |
Family
ID=55066613
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15817859.0A Not-in-force EP3242781B1 (de) | 2015-01-05 | 2015-12-23 | Verfahren zur herstellung von furnierschichtholz |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3242781B1 (de) |
DE (1) | DE102015100033A1 (de) |
WO (1) | WO2016110414A1 (de) |
Families Citing this family (5)
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 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
2015
- 2015-01-05 DE DE102015100033.4A patent/DE102015100033A1/de not_active Withdrawn
- 2015-12-23 EP EP15817859.0A patent/EP3242781B1/de not_active Not-in-force
- 2015-12-23 WO PCT/EP2015/081113 patent/WO2016110414A1/de active Application Filing
Also Published As
Publication number | Publication date |
---|---|
EP3242781B1 (de) | 2019-02-20 |
WO2016110414A1 (de) | 2016-07-14 |
DE102015100033A1 (de) | 2016-07-07 |
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