EP3365147A1 - Procédé permettant d'enturer des feuilles de contreplaqué - Google Patents

Procédé permettant d'enturer des feuilles de contreplaqué

Info

Publication number
EP3365147A1
EP3365147A1 EP16782068.7A EP16782068A EP3365147A1 EP 3365147 A1 EP3365147 A1 EP 3365147A1 EP 16782068 A EP16782068 A EP 16782068A EP 3365147 A1 EP3365147 A1 EP 3365147A1
Authority
EP
European Patent Office
Prior art keywords
veneer
edge
sheets
conveyor
grinding tool
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.)
Withdrawn
Application number
EP16782068.7A
Other languages
German (de)
English (en)
Inventor
Josef Hanses
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.)
Hanses Sagewerkstechnik & Co KG GmbH
Original Assignee
Hanses Sagewerkstechnik & Co KG GmbH
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
Application filed by Hanses Sagewerkstechnik & Co KG GmbH filed Critical Hanses Sagewerkstechnik & Co KG GmbH
Publication of EP3365147A1 publication Critical patent/EP3365147A1/fr
Withdrawn legal-status Critical Current

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
    • B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
    • B27D5/006—Trimming, chamfering or bevelling edgings, e.g. lists
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/02—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor characterised by a special purpose only
    • B27B5/04—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor characterised by a special purpose only for edge trimming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/0013—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles
    • B27M3/002—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected at their ends

Definitions

  • the invention relates to a method for shearing veneers.
  • rectangular veneer sheets are laid on top of each other in several layers and glued together under pressure.
  • book laying the veneer sheets are folded together to form an endless strand, with the joints between the veneer sheets following one another in the direction of one another being offset from one another in relation to one another, resulting in a stable bond.
  • DE 887 702 C discloses a wet-shearing method in which the shank already takes place during the peeling of the veneers, that is to say in a state in which the wood is still relatively moist and soft. Even with this method, however, you will not get perfectly flawless edges.
  • the object of the invention is to provide a method which makes it possible to obtain veneer edges of higher quality.
  • This object is achieved in that one edge of the veneer is pressed with a longitudinally extending edge of this pressure shoe against a pad 20 that the edge projects beyond the base, and that a Beklamvorraum and a grinding tool, an oblique to the plane of the veneer has an inclined surface, along the edge of the veneer, so that with the trimming device an edge strip of the veneer is removed and the veneer is handled with the sanding head.
  • the veneer edge can be processed gently, so that the formation of cracks and breakouts is significantly reduced.
  • the trimming device for example a scoring saw or a chipper
  • a straight cut is made at the tapered end of the cladding zone, so that a straight cut is achieved. de and clean bump. This not only improves the visual appearance, but also facilitates the detection of the edge with an electronic measuring system (camera, light curtain or scanner), so that the book laying process can be controlled more precisely and a higher level of accuracy can be achieved.
  • the grinding tool When the trimming device and the grinding tool travel along the veneer edge, the grinding tool preferably follows the trimming device. Since then the edge strip that has been cut or machined with the trimming, does not need to be ground with, results in less wear of the grinding tool and it allows a higher processing speed.
  • the adjustment of the trimming device and of the grinding tool can be carried out so that the veneer thickness at the edge created by the trimming device is reduced to zero with the grinding tool, so that the bearing zone runs at an acute angle.
  • this impact edge increases the resistance of the veneer to impacts and other mechanical effects and reduces the sensitivity to variations in the depth of sanding so that a very clean and straight edge is obtained.
  • the process is preferably carried out as a dry-process after drying the veneers.
  • the invention also provides an apparatus for carrying out the method described above and a method for producing laminated veneer lumber, which is based on the method described above.
  • the proposed here Schftungs method is only applied to the veneer sheets that are to form the top layers of veneer plywood.
  • the inner veneer layers, where the chipped edges are not visible in the finished product, can already be processed by peeling the veneer in a wet process.
  • FIG. 1 is a perspective view of the essential parts of a device for shearing veneers according to the method of the invention
  • FIG. 2 shows a side view of the device from the direction of the arrows II-II in FIG.
  • Fig. 3 is a view corresponding to Fig. 2, but with a grinding tool of the device omitted, so that a scoring saw disposed behind it is more clearly visible;
  • Fig. 4 is a perspective view of a veneered edge
  • Fig. 5 is a side view of a portion of a multi-ply veneer strand for the production of veneer plywood.
  • FIG. 1 shows a shed device 10 which is arranged at the end of a belt conveyor 12.
  • a shed device 10 On the belt conveyor 12 rectangular veneer sheets 14 are transported, which were previously dried in a drying station, not shown, and sorted in a also not shown sorting station by quality.
  • the shaving apparatus 10 are supplied only those veneer sheets 14, which are largely free of defects and have such a high quality that they are suitable as cover layers of veneer lumber.
  • the shifter 10 has a rail-like frame 16, which extends at the end of the belt conveyor 12 transversely to the conveying direction over the entire width of the belt conveyor.
  • a carriage 18 is guided on rails 20 and can be moved along the frame 16.
  • An upper profile region of the frame 16 forms a base 22, which is flush with the top of the belt conveyor 12.
  • a camera 24 is arranged above the belt conveyor 12, with which the time of passage of a leading edge 26 of the veneer panel 14 can be detected.
  • the drive of the belt conveyor 12 is then controlled so that the veneer panel 14 is slid over the end of the belt conveyor onto the base 22 until its leading edge 26 projects slightly beyond the base 22.
  • a trimming device 28 and a grinding tool 30 are arranged on the carriage 18.
  • the trimming device 28 is in the example shown a scoring saw with a circular saw blade 32 which is driven via a belt drive 34 by a rotationally driven drive pulley 36.
  • a trimming and a Zerspaner be provided which completely machined the cut strip of material.
  • the grinding tool 30 has an endless abrasive belt 38 which passes over a belt roll 40 and a corresponding cylindrical portion 42 of the drive pulley 36.
  • the carriage 18 In a starting position, the carriage 18 is located in an end portion of the frame 16, which lies outside the width of the belt conveyor 12 at the left in Fig. 1, so that the trimming device and the grinding tool, the feed of the veneer board 14 are not in the way.
  • a pressure shoe 44 extending parallel to the backing 22 is lowered by pneumatic, hydraulic, or electric drives 46 so as to press the edge zone of the veneer sheet 14 against the backing 22 so to fix the veneer board. Subsequently, the carriage 18 moves from left to right in Fig.
  • Fig. 2 it can be seen that the axis of the tape roll 40 for the abrasive belt 38 as well as the axis of the circular saw blade 32, which is almost completely obscured in Fig. 2, with respect to the plane of the veneer panel 14 are made somewhat oblique such that the abrasive tool produces a wedge-shaped profile 48 at the edge of the veneer panel.
  • the trimming device 28 can be seen with the circular saw blade 32.
  • FIG. 4 Dashed lines in Fig. 4, the original state of the edge 26 of the veneer board is shown. It is assumed here that the veneer sheet 14 has already undergone a pre-stenching prior to reaching the shaving apparatus 10 described herein, for example, a wet shearing prior to drying the veneers. The edge 26 has des- half even in the state in which it reaches the shifter 10, a wedge-shaped figure, however, is disturbed by numerous cracks and outbreaks 54. By performing with the shank device 10 Shuftung these cracks and breakouts are removed, so that you get a clean business edge.
  • Fig. 5 shows schematically a side view of a strand 56 of glued veneer sheets 14 and 58, which are superimposed in several layers.
  • the strand 56 is transported on the laying line not shown in detail from left to right in Fig. 5 to a press, not shown.
  • the upper and lower topsheets of the strand 56 are formed by veneer sheets 14 which have been post-processed in the shaving apparatus 10 according to the method described above.
  • the inner layers are formed by veneer sheets 58, which have been subjected only to wet-shearing.
  • wet shearing was performed both on the veneer sheets 58 of the inner layers and on the veneer sheets 14 of the outer layers on both edges running transversely to the strand direction, so that the sheets can overlap each other with their shanks and thus with a veneer layer form substantially constant thickness.
  • shanks are formed on both edges of each veneer panel on the same side of the panel, in the example shown at the bottom.
  • the stringer zones later covered by the shear zone of the subsequent panel bend downwardly (at the latest during the subsequent extrusion of the string) due to the weight of the panels above in Fig. 5, it looks as if the panels were left at the top at the top.
  • the (Nach-) Shuftung with the shifter 10 is made in the example shown only on one edge of the veneer panel 14, in the upper cover layer in each case at the right in Fig. 5 end.
  • the straight and clean abutting edges 52 are obtained which ensure a clean appearance of the veneer plywood body formed after pressing.
  • the opposite edges of the veneer panels 14 on the left in FIG. 5, it is not necessary to add any additional parts, since these edges are in any case covered by the overlying hinge zone of the respectively following veneer panel.
  • the veneer sheets 14 are applied in opposite orientation so that the clean abutting edges 52 are each at the left end of each veneer sheet and thus also at the end visible from the outside.
  • the veneer sheets 14 of the lower cover layer are laid.
  • the veneer sheets 58 of the inner plies are put into "books" each consisting of staggered sheets, in the example shown each of three sheets, in the general case of N sheets, if N is the number of veneer sheets of the inner plies of the billet .
  • the individual books are then placed one after the other on the lower cover layer and placed together so that they placed lower cover layer and thereby placed together so that they together form the core of the strand 56.
  • the veneer panels 14 of the upper cover layer are placed.
  • Sl designates the position of the front edge of a lower veneer board 58 of a book.
  • S2 indicates the position of the front edge of the middle veneer board 58 of the same book
  • S3 indicates the position of the front edge of the topmost veneer board 58 of this book. It can be seen that the distance Di between the positions S 1 and S2 is the same as the distance between the positions S2 and S3. That is, the offset of the veneer sheets from layer to layer corresponds to a uniform grid for all inner layers.
  • the position of the front edge of the veneer board 14 is referred to, which rests on the ending at S3 book.
  • the distance D34 between these positions is significantly different from Di.
  • S5 denotes the position of the leading edge of the uppermost veneer sheet 58 of the succeeding book
  • S6 denotes the position of the leading edge of the associated veneer sheet 14 in the upper cover sheet.
  • the distance D56 between these positions is different not only from Di, but also from the distance D34 between the preceding pair of veneer sheets in the same layers.
  • the veneer sheets 14 of the topsheets are thus laid in their own rhythm, which depends on the length of these veneer sheets and is different from the rhythm of the successive books in the inner layers.
  • the laying of the lower and upper cover sheets may be done with a fixed tact which is different only from the timing when laying the books for the inner sheets.
  • the camera 24 may also be used to detect and electronically evaluate the cracks and breakouts 54 in the male edge 26. The projection of the edge 26 on the pad 22 and thus the width of the edge strip 50 which is separated with the circular saw blade can therefore be made dependent on the size of the outbreaks. In that case, it is also convenient to electronically detect the leading and trailing edges of the veneer sheets even when laying the veneer sheets 14, and to control the laying process so that the veneer sheets are abutted with the correct overlapping of the stitching zones.
  • the belt conveyor 12 may be controlled to bring that defect to a position beyond the base 22 so as to sever the defective portion of the veneer board with the trimming device 28 becomes.
  • the cut with the circular saw blade will generally be made at a position where the veneer board has its full thickness, more material has to be removed with the grinding tool 30. If necessary, the speed at which the carriage 18 is moved across the width of the veneer panel can be adjusted.

Landscapes

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

Abstract

L'invention concerne un procédé permettant d'enturer des feuilles de contreplaqué (14), caractérisé en ce qu'une arête (26) de la feuille de contreplaqué (14) est pressée au moyen d'un patin de pression (44) s'étendant le long de cette arête contre un support (22), de sorte que l'arête fasse saillie du support, et qu'un dispositif de rognage (28) et un outil de rectification (30), qui présente une surface de rectification mise en place de manière oblique par rapport au plan de la feuille de contreplaqué, circulent le long de l'arête (26) de la feuille de contreplaqué, de sorte que le dispositif de rognage (28) permette de couper une bande de bord (50) de la feuille de contreplaqué et la feuille de placage soit enturée au moyen de la tête de rectification (30).
EP16782068.7A 2015-10-21 2016-10-17 Procédé permettant d'enturer des feuilles de contreplaqué Withdrawn EP3365147A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015117931.8A DE102015117931A1 (de) 2015-10-21 2015-10-21 Verfahren zum Schäften von Furnieren
PCT/EP2016/074899 WO2017067889A1 (fr) 2015-10-21 2016-10-17 Procédé permettant d'enturer des feuilles de contreplaqué

Publications (1)

Publication Number Publication Date
EP3365147A1 true EP3365147A1 (fr) 2018-08-29

Family

ID=57138077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16782068.7A Withdrawn EP3365147A1 (fr) 2015-10-21 2016-10-17 Procédé permettant d'enturer des feuilles de contreplaqué

Country Status (5)

Country Link
US (1) US20180304491A1 (fr)
EP (1) EP3365147A1 (fr)
CA (1) CA3001769A1 (fr)
DE (1) DE102015117931A1 (fr)
WO (1) WO2017067889A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016113548A1 (de) 2016-07-22 2018-01-25 Hanses Sägewerkstechnik GmbH & Co. KG Furnierschichtholzprodukt und Verfahren zu seiner Herstellung
CA3201642A1 (fr) * 2020-12-08 2022-06-16 Valinge Innovation Ab Procede de production d'un element plaque et element plaque

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE905666C (de) * 1941-09-11 1954-03-04 Westdeutsche Sperrholzwerke Ag Verfahren zur Herstellung von Schichtholz oder Sperrholz aus geschaefteten Furnieren
DE887702C (de) 1941-09-18 1953-08-27 Westdeutsche Sperrholzwerke Ag Schaelmaschine zum Anschaeften von Furnieren
US2913025A (en) * 1955-11-23 1959-11-17 Yates American Machine Co Combination saw, jointer and sander tool
FR2633551B3 (fr) * 1988-06-22 1990-10-19 Delbeke James Dispositif de protection pour appareil de sciage et appareil muni d'un tel dispositif
DE4011851C2 (de) * 1990-04-12 1994-02-03 Schuette Fa Lanz Vorrichtung zum Besäumen und Anschärfen der seitlichen Stirnkanten von Furnierbahnen
DE19610271C1 (de) * 1996-03-15 1997-09-11 Scheer & Cie C F Furniersäge
CN103568083A (zh) * 2012-08-01 2014-02-12 黔西南州宏森木业有限公司 一种指接板的拼接工艺

Also Published As

Publication number Publication date
CA3001769A1 (fr) 2017-04-27
US20180304491A1 (en) 2018-10-25
WO2017067889A1 (fr) 2017-04-27
DE102015117931A1 (de) 2017-04-27

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