WO2001039943A1 - Method and apparatus for edge joining of veneer strips - Google Patents
Method and apparatus for edge joining of veneer strips Download PDFInfo
- Publication number
- WO2001039943A1 WO2001039943A1 PCT/DK2000/000654 DK0000654W WO0139943A1 WO 2001039943 A1 WO2001039943 A1 WO 2001039943A1 DK 0000654 W DK0000654 W DK 0000654W WO 0139943 A1 WO0139943 A1 WO 0139943A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- edge
- veneer
- glue
- nozzle
- edges
- Prior art date
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
Definitions
- the present invention relates to a method and apparatus for edge joining of plate elements made of veneer.
- a joining is relevant because it has in practice been found desirable to produce plate elements with a surface which imitates a number of joined pieces of wood, in particular for use in manufacturing of doors, cupboard doors and other furniture and building components, including floors.
- larger plate elements may be manufactured which have a pattern as if they consisted of parquet blocks, but which may be joined and supported in a much easier fashion than by the use of individual blocks.
- the cut veneer may be brought stripwise to equipment which may perform an edge joining of the strips.
- Machines which may spread adhesive on the edge surfaces of the thin veneer strips and subsequently press them edge to edge against each other, but this technique has not been able to perform to reasonable quality standards, because it is almost impossible to avoid that adhesive breaks through on the top side of the joints which means that the finished elements must be subjected to a finishing operation.
- a so-called adhesive filament i.e. a thin carrier filament with a covering of a thermoplastic adhesive, said filament being made to move in a zig-zag fashion across the joint at the lower side of the element and being pressed against said lower side while the adhesive is heated to softening.
- a sort of sewing-together of the edge areas is performed, whereby both a reasonable joining and a complete elimination of adhesive from the surface are obtained.
- the principle of well-controlled adhesive supply to the edge joining zone is retained, but an external heating of the adhesive is provided for in such a manner that no problems are created for the joining process or for the transport of the strips.
- DE 3510147 discloses a techniques, by which the veneer strips are conveyed between respective pairs of conveyor belts at either side of a sword, at the end of which there is arranged a vertical nozzle sending warm glue down against a carrier belt just underneath the still open joint between the strips.
- This belt closes the bottom of the joint, and its ve- locity is adjustable, whereby it is possible to lay out a sort of liquid thread with a controllable thickness just before the final closing of the joint.
- the nozzle mouth is located somewhat above the top side level of the strips, and with the narrow space conditions it is difficult to avoid deposition of glue at the top edge areas of both strips.
- the invention which relates to a method according to the ingress of claim 1, is primarily characterised in that which is given in the characterising part of this claim. It is hereby essential that the adhesive, which is supplied in an already fully heated and softened condition and in a measured amount to avoid excess adhesive in the joint, does not be subjected to heating after the provision of the adhesive which would also affect the joining edge areas of the veneer strips themselves.
- the supplied warm adhesive will obviously in itself cause a certain heating of these areas, but when this heating is concentrated to act upon the adhesive itself before its application, the general heating of the edge areas will be very limited, due to the fact that the adhesive is supplied in a very limited amount.
- the total heating of the edge areas will hence not cause any drying effect on the wood of importance, so that the manufacture may be performed without problems stemming from such a partial drying and with a very precise application of the glue at the veneer edge surface .
- Fig. 1 is a schematic perspective view of a joining appa- ratus for veneer strips
- Fig. 2 is a side view of such an apparatus modified according to the invention
- Fig. 3 is a perspective view of a detail of another modification
- Fig. 4 is a perspective view of a preferred embodiment of the invention
- Fig. 5 is a cross sectional view of a nozzle unit therein
- Fig. 6 is a perspective view of a complete apparatus according to the invention.
- Fig. 1 is shown the table top 2 of a machine on which have been placed two veneer strips 4 to be transported in the direction of the arrow.
- One or both of the strips may already be edge joined with further strips 4'.
- the strips have been placed from either side below a lengthwise disposed T-rail 6, the top flange of which is slanting in the forward direction.
- the strips 6 pass a pair of oppositely rotating, horizontal discs 8 which perform a slight compression on the strips 6 by means of friction, assisted by overhead pressure rollers (not shown) .
- the strips pass a centrally placed guide tube 10 for carrying an adhesive filament 12 to the butt seam area between the two strips 6, as the adhesive filament is discharged through a forwards-pointed discharge tip 14 of the guide tube 10.
- the joined strips pass a pressure roller 16 and a pair of pull rollers 18.
- This apparatus belongs to the prior art, but apart from the system for supplying the adhesive filament 12 the appara- tus is fully usable in connection with the invention.
- Fig. 2 is shown an embodiment of the invention, in which the adhesive is brought to the joint as a narrow jet 32 of a heated, liquid adhesive ejected from a nozzle 30, which jet hits precisely on at least one edge surface of the veneer strips immediately before they are brought against each other.
- the supply tube 34 to the nozzle 30 is brought through a heating unit 36, preferably electrical, which is located so close to the nozzle 30 that upon start after a period of rest it will heat the nozzle itself to melt solidified adhesive therein.
- the unit 36 may be combined with height adjustment means, such as a surrounding adjustment screw 38, by means of which the height of the nozzle may be finely adjusted to ensure that the jet 32 of adhesive hits precisely in its target zone.
- the adhesive must be supplied to the heating unit 36 at sufficient pressure and possibly in a pre-heated condition, but it is considered that this constitutes technical details which do not require further dis- cussion here.
- the result is that it is possible to establish a directed jet which is so precise that will imitate the use of a hot adhesive filament.
- a height-adjustable block 33 which has a narrow bore 35 from which a narrow passage 37 leads in the side of the block.
- the bore 35 is connected to a vertical channel which is connected to a magnet valve 39 to control adhesive supply from a hose with adhesive.
- a heating element (not shown) for local heating of the supply zone for the adhesive so that it may be fully liquid during the application to the veneer edge.
- the bore 35 may be quite narrow, e.g. 0.2 - 0.4 mm, whereby the adhesive may be applied with high precision on the thin edge surface of the veneer. It is prefer- able to use a pressure roller or a spring-loaded finger for the veneer edge at the place of application so that it will be correct even if the veneer should curve somewhat.
- Fig. 4 shows a preferred embodiment, in which the nozzle, here designated 40, is made as a small round unit having a wall facet 46 with a thin, laterally oriented nozzle hole 44.
- the unit 40 is preferably height adjustably supported for fine adjustment according to the thickness of the veneer to be joined, and it may even be angularly adjustable in order to be turnable or turned into a position in which the axis of the nozzle hole 44 is directed slightly obliquely in the forward direction of travel of the veneer, such that the delivery of glue from the nozzle hole is not directly blocked by the related veneer edge.
- the opposite veneer strip, designated 48 is supported by a carrier plate 50 in a level above the table 2 and above the top of the nozzle unit 40, such that the edge of this strip, seen horizontally, may be located in over the top of the nozzle unit as also indicated in Fig. 5.
- the wall facet 46 may be arched or broken to ensure that the veneer edge will not prevent discharge or glue from the nozzle hole 44.
- the glue supply should be adjusted in such a manner that it will correspond to the flow of glue as desired and enabled to be carried away be the travelling veneer edge.
- the glue is not "sprayed" against the veneer edge as in Fig. 2, as it is merely supplied in bulk - without any excessive pressure - to the space between the nozzle hole 44 and the relevant veneer edge so as to satisfy the conditions with respect to the de- sired degree of glue coverage of the veneer edge.
- This again will be a question of the character and viscosity of the glue, but experts in the relevant field will be able to determine these process parameters in more detail.
- the product RAKOLL M 2000 seems recommendable . As suggested especially in Fig.
- the glue consumption can be rather low, e.g. in the range of 10-50 mg per meter, typically about 25 mg/m.
- a machine according to the invention is schematically illustrated in Fig. 6 in its entirety.
- the veneer strips enter the machine table 2 at either side of the sword 6, passing under opposed pressure rollers 52 that may cooperate with the top of driven rollers 54 underneath the table 2.
- Fig. 4 there is slightly elevated support 50 at one side of the sword.
- a double roller 56 is placed over the delivery end of the sword 6 and right over the nozzle 40, and a broad roller 58 is placed so as to cooperate with the friction discs 8 of the table 2 (Fig. 1) .
- a broad delivery roller 60 cooperates with a lower driving roller 62.
- rollers are arranged so as to be forceable down against the table 2, preferably in an individual manner, but here shown as a collective mounting on a beam 64 held by pressure cylinders 66 on a chassis element 68 extending over the table 2 from the right hand side thereof, thus leaving space on the table for the joining of further veneer strips to already built-up plate elements.
- More pressure rollers can be provided between the rollers 58 and 60.
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)
- Adhesives Or Adhesive Processes (AREA)
- Coating Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002392306A CA2392306A1 (en) | 1999-11-29 | 2000-11-29 | Method and apparatus for edge joining of veneer strips |
DE20080262U DE20080262U1 (en) | 1999-11-29 | 2000-11-29 | Device for connecting veneer panels |
JP2001541661A JP2003515469A (en) | 1999-11-29 | 2000-11-29 | Method and apparatus for edge joining veneer veneers |
AU16936/01A AU1693601A (en) | 1999-11-29 | 2000-11-29 | Method and apparatus for edge joining of veneer strips |
PL00355501A PL355501A1 (en) | 1999-11-29 | 2000-11-29 | Method and apparatus for edge joining of veneer strips |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DK1999/000666 WO2000032370A2 (en) | 1998-11-27 | 1999-11-29 | Method and apparatus for edge joining of veneer strips |
DKPCT/DK99/00666 | 1999-11-29 | ||
DKPA200000856 | 2000-05-31 | ||
DKPA200000856 | 2000-05-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001039943A1 true WO2001039943A1 (en) | 2001-06-07 |
Family
ID=26068443
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK2000/000654 WO2001039943A1 (en) | 1999-11-29 | 2000-11-29 | Method and apparatus for edge joining of veneer strips |
Country Status (7)
Country | Link |
---|---|
JP (1) | JP2003515469A (en) |
CN (1) | CN1265948C (en) |
AU (1) | AU1693601A (en) |
CA (1) | CA2392306A1 (en) |
DE (1) | DE20080262U1 (en) |
PL (1) | PL355501A1 (en) |
WO (1) | WO2001039943A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10140398A1 (en) * | 2001-08-17 | 2003-03-06 | Kuper Heinrich Gmbh Co Kg | Butt glue joint production between veneer leaves involves deposition of heated adhesive stripped from a wire carrier onto veneer edges |
ITTV20090093A1 (en) * | 2009-05-13 | 2010-11-14 | Valmec Sas Di Rossi Claudia & C | VENEER-VENEERING MACHINES. |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004012634B4 (en) * | 2004-03-16 | 2007-05-10 | Mattil, Klaus, Prof. Dipl.-Ing. | Method for bonding and solidifying layered surface materials |
AT413088B (en) * | 2004-07-30 | 2005-11-15 | Theurl Leimholzbau Gmbh | METHOD FOR THE TOUCH-FREE APPLICATION OF DOSED ADHESIVE TINS ON THE STRIP-TREATED NARROW SURFACE OF THE WORKPIECE |
EP2168734A1 (en) * | 2008-09-29 | 2010-03-31 | Heinrich Kuper Gmbh & Co Kg | Method for producing a veneer carpet |
CN107263930B (en) * | 2017-07-31 | 2023-06-02 | 东莞市业润自动化设备有限公司 | Edge pasting machine with trimming function |
CN110029483A (en) * | 2018-01-12 | 2019-07-19 | 山东盛华投资有限责任公司 | A kind of special equipment for filter bag tube-shape bag body longitudinal joint gluing |
CN108162099B (en) * | 2018-01-16 | 2023-07-14 | 洞口县万美复合材料有限公司 | Pressing equipment for plywood production |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1026066B (en) * | 1955-10-06 | 1958-03-13 | Scheidemandel Motard Werke Ag | Process for gluing joints, especially veneer joints, and for other gluing processes |
DE3510147A1 (en) * | 1985-03-21 | 1986-09-25 | Carl Rückle Maschinenbau GmbH, 7302 Ostfildern | Device for gluing strip-shaped surfaces of two materials |
DE3809432A1 (en) * | 1987-05-19 | 1988-12-08 | Fischer Ag Brugg Georg | DEVICE FOR PRESSURE REGULATION IN A VENEER COMPOSING MACHINE |
WO2000032370A2 (en) * | 1998-11-27 | 2000-06-08 | Vesterby Træteknik Aps | Method and apparatus for edge joining of veneer strips |
-
2000
- 2000-11-29 AU AU16936/01A patent/AU1693601A/en not_active Abandoned
- 2000-11-29 PL PL00355501A patent/PL355501A1/en unknown
- 2000-11-29 DE DE20080262U patent/DE20080262U1/en not_active Expired - Lifetime
- 2000-11-29 CA CA002392306A patent/CA2392306A1/en not_active Abandoned
- 2000-11-29 CN CNB008164525A patent/CN1265948C/en not_active Expired - Fee Related
- 2000-11-29 WO PCT/DK2000/000654 patent/WO2001039943A1/en active Application Filing
- 2000-11-29 JP JP2001541661A patent/JP2003515469A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1026066B (en) * | 1955-10-06 | 1958-03-13 | Scheidemandel Motard Werke Ag | Process for gluing joints, especially veneer joints, and for other gluing processes |
DE3510147A1 (en) * | 1985-03-21 | 1986-09-25 | Carl Rückle Maschinenbau GmbH, 7302 Ostfildern | Device for gluing strip-shaped surfaces of two materials |
DE3809432A1 (en) * | 1987-05-19 | 1988-12-08 | Fischer Ag Brugg Georg | DEVICE FOR PRESSURE REGULATION IN A VENEER COMPOSING MACHINE |
WO2000032370A2 (en) * | 1998-11-27 | 2000-06-08 | Vesterby Træteknik Aps | Method and apparatus for edge joining of veneer strips |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10140398A1 (en) * | 2001-08-17 | 2003-03-06 | Kuper Heinrich Gmbh Co Kg | Butt glue joint production between veneer leaves involves deposition of heated adhesive stripped from a wire carrier onto veneer edges |
DE10140398C2 (en) * | 2001-08-17 | 2003-06-26 | Kuper Heinrich Gmbh Co Kg | Method and device for butt bonding of veneer sheets |
ITTV20090093A1 (en) * | 2009-05-13 | 2010-11-14 | Valmec Sas Di Rossi Claudia & C | VENEER-VENEERING MACHINES. |
Also Published As
Publication number | Publication date |
---|---|
PL355501A1 (en) | 2004-05-04 |
DE20080262U1 (en) | 2001-11-15 |
AU1693601A (en) | 2001-06-12 |
CN1265948C (en) | 2006-07-26 |
CN1402661A (en) | 2003-03-12 |
JP2003515469A (en) | 2003-05-07 |
CA2392306A1 (en) | 2001-06-07 |
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