EP2569131A1 - Vorrichtung und verfahren zur zusammensetzung von furnierstreifen mit expansionsraum - Google Patents
Vorrichtung und verfahren zur zusammensetzung von furnierstreifen mit expansionsraumInfo
- Publication number
- EP2569131A1 EP2569131A1 EP11713187A EP11713187A EP2569131A1 EP 2569131 A1 EP2569131 A1 EP 2569131A1 EP 11713187 A EP11713187 A EP 11713187A EP 11713187 A EP11713187 A EP 11713187A EP 2569131 A1 EP2569131 A1 EP 2569131A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- veneer
- hot air
- adhesive
- outlet
- edges
- 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
Definitions
- the present invention relates to an apparatus and method for assembling veneer strips with an expansion space in an adhesive activation zone, in particular for avoiding contact between activated adhesive on the veneer strips and components of the device.
- devices for assembling veneer strips are known from the prior art in different embodiments. Basically, devices must be distinguished in which a gluing station is preformed, which glues the edges of the veneer strips and then immediately after the assembly takes place. Alternatively, the edges of veneers may be pre-wetted with an adhesive, in particular polyvinyl acetate (PVAc) dispersion adhesive, and intermediately stored. This storage over several months or even years is possible.
- PVAc polyvinyl acetate
- the veneers in the device is fed and the adhesive dried at the edges must be activated. This can be done for example by means of hot air. After activation, the veneer strips can then be joined together.
- the dependent claims show preferred developments of the invention.
- the inventive device for assembling veneer strip with the features of claim 1 has the advantage over that pollution of the device can be avoided by adhesive residues. As a result, a cost-effective and continuous composition of veneer strips with high-quality adhesive joint can be performed.
- the device has an adhesive activation station which has at least one hot air source and a hot air path emanating from the hot air source with an outlet element.
- the outlet element comprises an outlet opening and an expansion space.
- Hot air flows out of the outlet opening and flows past the edges of the veneer strip passing over the outlet opening in order to move the Activate adhesive on the edges.
- the outlet opening and the expansion space are arranged below and / or above a Veneierzuschreibebene so that the hot air is fed from below and / or above to the veneer edges.
- the expansion space can also serve as a drainage device for excess adhesive.
- the invention is particularly suitable for the use of a dispersion adhesive (especially mixed white glue) on the veneer edges, which has the great advantage that it is free of formaldehyde and is very easy to handle. Furthermore, a dispersion adhesive is also very inexpensive compared to other adhesives.
- a dispersion adhesive especially mixed white glue
- the expansion space and the outlet opening are fluidically connected with each other, wherein preferably the outlet opening opens into the expansion space.
- the outlet opening opens into the expansion space.
- the expansion space as an expansion channel in particular as a rectilinear, extending in a conveying direction of the veneer strip expansion channel is formed.
- the expansion channel is parallel to the joint of the veneer strip, so that during the incipient joining process, in which the veneer strips are continuously moved in the conveying direction over the entire distance from the hot air outlet to the joining zone, if necessary, the adhesive expands in the expansion channel, without doing to come in contact with machine parts.
- excess adhesive joint residues may be ground off the produced veneer carpet.
- the hot air can be excellently guided along the expansion channel.
- the device comprises an air flow deflection device, which is arranged above the outlet opening.
- the air flow deflection device serves for channeling the hot air in order to activate the adhesive at the veneer edges in the entire surrounding area of the outlet opening of the hot air and before the composition zone, whereby more uniform heating of the adhesive and better utilization of the thermal energy is achieved in these areas.
- a higher ambient temperature is achieved in the entire surrounding area of the outlet opening.
- the exiting through the outlet hot air is thus passed through the gap between the two veneer strips to be joined and meets the air flow deflection device.
- the hot air is deflected, in particular in the conveying direction of the veneer strip and, in addition, the air flow deflection device itself also heats up. In this way, a faster activation of the adhesive can be achieved.
- the air flow deflection device is preferably made of a material with good thermal conductivity. As a result, a very good heat distribution at the air flow deflection device is achieved, so that an activation region for the adhesive is not only present directly at the outlet opening for the hot air, but the activation takes place due to the high temperatures in preceding or subsequent sections.
- the air flow diverter is made of copper sheet.
- a distance between a surface of the outlet element and the air flow deflection device is slightly larger than a thickness of the veneer strips.
- the air flow deflection device has a surface such that a coefficient of friction between the surface and the veneer strip is as small as possible.
- the surface of the air flow deflection device has a Teflon coating or the like.
- the air flow deflection device has at least one air passage opening. This makes it possible that supplied hot air can escape from the air passage opening on the veneer strip. This prevents in particular unwanted noise by vibrating veneer strips.
- the air passage opening may, for example, be in the form of a slot or row of holes, e.g. cylindrical holes or slots are provided. More preferably, the air passage opening on a side facing the expansion space on a recessed recess. The air passage opening is preferably provided such that it is arranged completely or partially above the expansion space and in particular above the outlet opening of the hot air.
- the device comprises a pressure roller for exerting a vertical pressure on the veneer strip, wherein the expansion space in the outlet element extends into the region of the pressure roller and particularly preferably up to a region of a vertical projection of a rotation axis of the pressure roller.
- the expansion space preferably extends below the axis of rotation of the pressure roller, since here the pressure roller is in contact with the veneer strip and, if appropriate, excess adhesive can still escape from the joining area between the two veneer strips.
- the hot air path opens at the outlet element perpendicular to the surface of the outlet element.
- the hot air path at the outlet element also emerge at an angle.
- the angle is between 30 ° and 60 °, preferably 45 °, wherein the outlet direction of the hot air is directed in Veneierennecardiraum.
- the inventive method according to claim 16 allows a very high quality, blunt composite veneer joint between two veneer strips Prevent contamination of a veneer splicer.
- a dispersion adhesive applied to the edges of the veneer strips is activated by means of hot air exiting an exit element and subsequently the veneer strips are applied to the adhesive-activated veneer edges blunted.
- the fuming strips are guided past an expansion space of the exit element in order to avoid contact of the activated dispersion adhesive with machine parts.
- the expansion space extends into a transition region between an activation region in which the dispersion adhesive is activated and a joining region in which the veneer strips are joined.
- the expansion space By providing the expansion space and passing the adhesive-activated veneer edges to this expansion space, soiling of the machine can be avoided.
- the expansion space makes it possible that the activated veneer edges no longer come into direct contact with machine parts of the machine until the beginning of joining, where they cause soiling.
- an immediate adhesion of the adhesive to subsequent machine parts can be avoided.
- the quality of joining is not impaired by this, since if necessary, excess adhesive is pushed out by the compression of the veneer strips on the veneer edges and can then be simply cured and subsequently abraded.
- the method is particularly effective when the expansion space is preferably provided as an expansion channel and an outlet opening opens into the expansion channel, so that the exiting the outlet opening hot air also flows into the expansion channel.
- an improved activation of the dispersion adhesive and higher temperatures in the activation region of the machine can be achieved.
- FIG. 1 a schematic sectional view of an apparatus for assembling veneer strip according to a first embodiment of the invention, a schematic plan view of the device of Fig. 1, a perspective view of an outlet element used in the device, a schematic sectional view of an apparatus for assembling veneer strip according to a second embodiment of the invention, a schematic sectional view of a device for assembling veneer strip according to a third embodiment of the invention, an enlarged perspective view of a component for supplying hot air according to the third embodiment, a schematic sectional view of an apparatus for assembling veneer strip according to a fourth embodiment, a schematic plan view of the device of Fig. 7, and alternative embodiments of a Beerstrom- Umlenkeinrichtun invention G.
- the device 1 comprises a Veneierzuschreibebene E, in which veneer strips 2 are supplied.
- the feeding of the veneer strips can be done manually or automatically.
- two veneer strips 2 are always fed in parallel, an adhesive already being applied to the facing edges 2a of the veneer strips, which must be activated in a subsequent step.
- the device 1 comprises an adhesive activation station 3, which is then followed by a veneer filling station 4.
- the adhesive activation station 3 the adhesive present at the edges 2 a is activated, so that joining of the veneer strips is then possible in the subsequent step.
- the adhesive may preferably be a formaldehyde-free dispersion adhesive applied to the edges 2a, wherein the applied adhesive, may have been applied several months earlier at the veneer edges.
- the adhesive activation station 3 comprises a stationary hot air source 5 and a hot air path 6 emanating from the hot air source 5 with an outlet element 7.
- the outlet element 7 comprises an outlet opening 8 and, as an expansion space, a rectilinear groove 9 with a preferably rectangular or U-shaped cross section.
- the groove 9 opens, as shown in FIGS. 1 and 3 can be seen in the outlet opening 8 and starts from this. As can be seen from FIG. 1, the groove 9 and the outlet opening 8 are arranged below the veneer feed plane E.
- the hot air flows from below through the exit element 7 in the gap 10 between the two veneer strips 2 to be joined (see Fig. 2), wherein the groove 9 has a width which is greater than the gap 10.
- the outlet opening 8 has a larger diameter than the hot air path 6.
- a screw-threaded, cylindrical hollow pin 17 may be provided, which has a central passage opening 17a, through which the hot air path 6 is passed.
- the hot air can then be guided through the hollow bolt 17 to the outlet opening 8 and the outlet member 7 are fastened in a simple manner to another component 18.
- the device 1 further comprises an air flow deflection device 1 1 and a separating web 12.
- the air flow deflection device 1 1 as shown in FIG. 1 can be seen attached to the divider and formed as a copper sheet and is above the outlet opening. 8 and partially disposed over the groove 9.
- the air flow deflection device 1 1 has the task of redirecting the emerging from the outlet opening 8 hot air, which flows through the gap 10 between the two veneer strips 2, to redirect. This is indicated in FIG. 1 by the arrow B, wherein the arrow A indicates the hot air flowing from the hot air source 5 through the hot air path 6.
- a conveying direction of the veneer strip 2 is further marked with the arrow C.
- the device 1 further comprises in a known manner two Diskusepticn 13, 14 and a pressure roller 15, which rotates about a center 16.
- the groove 9 is arranged in the conveying direction C of the veneer strips such that it extends as far as a vertical projection of the point of rotation 16 of the pressure roller 15.
- the function of the device 1 according to the invention is as follows.
- the veneer strips already have adhesive at their edges 2a, which was applied there in a preceding step, whereby the adhesive may be dried or at least dried. This may have happened some time before.
- the veneer strips are then fed into the veneer feed plane E, whereby the veneer strips can be applied to the separating web 12 for a simple alignment.
- the veneer strips 2 are then moved manually or by a chain drive in the direction of the conveying direction C of the veneer strips and guided over the outlet element 7.
- the alignment of the veneer strips 2 is such that the gap 10 between the two veneer strips is above the outlet opening 8 in the outlet element 7.
- Hot air which is supplied through the hot air path 6 to the outlet opening 8, then exits between the two veneers 2 at the edges 2a provided with adhesive and activates the adhesive present there.
- the activated adhesive can experience a reduction in viscosity. This increases the risk of adhesion and partial stripping on surrounding components, which can come into direct contact with the adhesive-wetted veneer edges 2a.
- the groove 9 thus provides an expansion space available, so that sticking and stripping is omitted.
- excess adhesive can also be collected in the groove 9.
- the FumierstMail 2 are thereby continuously fed past the adhesive activation station 3. In the area of Diskusscalen 13 and the pressure roller 15 then begins the joining process.
- the veneer strips are conveyed through the two Diskusscalen 13, 14 and the pressure roller 15.
- the entire edge length of the veneer strips is thus guided past the outlet opening 8 and the adhesive is activated for the joining process.
- the over the outlet opening 8 and a portion of the outlet element 7 arranged air flow deflection 11 supports the activation process even more, since the hot air is diverted to the air flow deflection.
- the hot air path 6 opens perpendicular to a surface 7a of the outlet element 7, the hot air is diverted both in the conveying direction C of the veneer strips and counter to the conveying direction of the veneer strips.
- the groove 9 can be prevented that excess adhesive is further transported through the device 1 and then dirty other components of the device or adhesive by contact of the activated adhesive with machine parts glue to the machine parts, which then in the subsequent joining step for the production a quantitatively high quality joint is missing.
- the excess adhesive may optionally be collected in the groove 9 and the groove 9 may then be easily cleaned after joining a certain number of veneer strips 2.
- the device 1 of the second exemplary embodiment additionally comprises a second stationary hot-air source 25 with a second hot-air path 26.
- the second hot-air source 25 and the second hot-air path 26 are arranged above the veneer feed plane E, so that hot air additionally can be fed from above on the edges of the veneer strip 2 (arrow R).
- a second outlet opening 28 of the second hot air path 26 is in the conveying direction C of the veneer strip at the same height as the outlet opening 8 of the first hot air path 6.
- the second hot air path 26 is passed through the air flow deflection device 1 1. Further, in the air flow deflection device 1 1, a second expansion space in the form of a second, in the conveying direction C of the veneer strip 2 extending second groove 29 is formed. Hot air then flows out of the second outlet opening 28 into the second groove 29, wherein the two hot air streams flow against each other and partially flow against the veneer surfaces and are thereby deflected. Thus, the first groove 9 and the second groove 29 lie one above the other, wherein the mutually facing edges of the two veneer strips to be joined are passed exactly between the two grooves 9, 29.
- a hot air flow can be added both from below and from above to the gap 10 between the two veneer strips 2, so that an optimum heating of the applied adhesive at the edges of the veneer strips 2 is obtained. Since the adhesive located on the edges can expand when heated in all directions, in the second embodiment, in particular prevents that adhesive with the air flow diverter 1 1 comes into contact and there contamination or buildup can be avoided.
- the second groove 29 is formed via the complete length of the air flow deflection device 1 1, starting from the second outlet opening 28 in the conveying direction C.
- a width and / or a depth of the first groove 9 and the second groove 29 is equal.
- a common hot air source may alternatively be provided for the first and second hot air paths. As a result, costs and space can be saved.
- a mouth of the hot air is formed on the outlet element 7 differently from the orifices of the preceding exemplary embodiments.
- a nozzle 37 is fixed in the outlet element 7, which has a channel-like mouth section 38.
- the mouth cross section 38 opens into an elongated groove 9 and preferably has a same width as the groove 9.
- a length of the channel-like orifice cross-section 38 is shorter than a length of the groove 9.
- the length of the channel-like orifice cross-section 38 can also be provided such that its length corresponds to that of the groove 9 .
- This design of the elongated, channel-like orifice cross-section 38, which opens directly into the groove 9, an improved outflow of the hot air, as indicated in FIGS. 5 and 6 by the arrows B1 and B2, can be achieved because the hot air via an in Movement direction of the veneers 2 longer area can flow between the veneers.
- a fluidically better connection of the groove 9 to the outlet opening 38 is achieved. In this way, in particular, a longer activation zone in the machine lying somewhat in the conveying direction of the veneer strips can be achieved, so that the temperature of the hot air can be reduced. Otherwise, this embodiment corresponds to the previous embodiments, so that reference can be made to the description given there.
- FIGS. 7 and 8 show a device according to a fourth exemplary embodiment of the invention, wherein identical or functionally identical ones are designated by the same reference numerals as in the preceding exemplary embodiments.
- the fourth embodiment corresponds essentially to the first embodiment, wherein additionally in the fourth embodiment, a slot 40 is provided in the air flow deflection device 1 1.
- the slot 40 is provided centrally in the air flow deflection device 1 1 and extends, as shown in FIG. 7 can be seen, over the expansion space designed as a groove 9.
- the slot 40 is provided such that, starting from a free end of the air flow deflection device 11, it runs in the direction of the separating web 12 in a line with the separating web 12.
- the width of the slot 40 is constant.
- FIGS. 9 to 11 show alternative embodiments of the air flow deflection device 11.
- Fig. 9 shows an embodiment in which an air passage opening in the air flow deflection device 1 is formed by a plurality of cylindrical holes 4 "arranged in series.
- Fig. 10 shows an alternative embodiment in which the air passage opening in the air flow deflection device 1 1 1 1 shows a further alternative embodiment in which a recessed recess is provided on the air passage opening, which in turn is designed as a slot 40, on the side facing the groove 9.
- the adhesive in particular glue, adheres to the underside of the air flow deflection device 11. Therefore, the recess 43 is also provided somewhat wider than the air passage opening.
- the present invention by providing an expansion space in the adhesive activation zone, contact of the activated adhesive with components of the veneer strip assembling apparatus 1 can be prevented. As a result, downtime of the device due to cleaning work can be minimized.
- the expansion space is particularly preferably provided until the beginning of the joining zone in a channel-like form. Furthermore, an improved heating of the adhesive and thus an improved utilization of the heat energy can be achieved.
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)
- Decoration By Transfer Pictures (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010020293 DE102010020293A1 (de) | 2010-05-12 | 2010-05-12 | Vorrichtung und Verfahren zur Zusammensetzung von Furnierstreifen mit Expansionsraum |
PCT/EP2011/001685 WO2011141101A1 (de) | 2010-05-12 | 2011-04-05 | Vorrichtung und verfahren zur zusammensetzung von furnierstreifen mit expansionsraum |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2569131A1 true EP2569131A1 (de) | 2013-03-20 |
EP2569131B1 EP2569131B1 (de) | 2015-09-23 |
Family
ID=44168178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11713187.0A Active EP2569131B1 (de) | 2010-05-12 | 2011-04-05 | Vorrichtung und verfahren zur zusammensetzung von furnierstreifen mit expansionsraum |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2569131B1 (de) |
CN (1) | CN102971122A (de) |
DE (1) | DE102010020293A1 (de) |
TW (1) | TW201139093A (de) |
WO (1) | WO2011141101A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012213796B4 (de) * | 2012-08-03 | 2021-03-25 | Brandt Kantentechnik Gmbh | Verfahren und Vorrichtung zum Beschichten von Werkstücken |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1443784A (en) * | 1921-06-13 | 1923-01-30 | Black Bros Company | Veneer-taping machine |
US1916134A (en) * | 1929-09-19 | 1933-06-27 | Laminating Patents Corp | Process of rapid edge gluing wood sheets and the product thereof |
DE3304315A1 (de) * | 1983-02-09 | 1984-08-09 | Heinrich Kuper GmbH & Co KG, 4835 Rietberg | Furnier-zusammensetzmaschine |
DE3510147A1 (de) * | 1985-03-21 | 1986-09-25 | Carl Rückle Maschinenbau GmbH, 7302 Ostfildern | Vorrichtung zum beleimen streifenfoermiger flaechen zweier werkstuecke |
JP3310284B2 (ja) * | 1990-07-24 | 2002-08-05 | オニール インコーポレイテッド | 弾性によって圧縮可能なファブリック・シートの間に接着剤によって接着した継ぎ目を形成する装置と方法 |
WO2000032370A2 (en) * | 1998-11-27 | 2000-06-08 | Vesterby Træteknik Aps | Method and apparatus for edge joining of veneer strips |
DK173988B1 (da) * | 1998-11-27 | 2002-03-25 | Vesterby Traeteknik As | Fremgangsmåde og apparat til kantsammenføjning af pladsdele af træfiner |
-
2010
- 2010-05-12 DE DE201010020293 patent/DE102010020293A1/de not_active Ceased
-
2011
- 2011-04-05 WO PCT/EP2011/001685 patent/WO2011141101A1/de active Application Filing
- 2011-04-05 CN CN2011800236057A patent/CN102971122A/zh active Pending
- 2011-04-05 EP EP11713187.0A patent/EP2569131B1/de active Active
- 2011-04-13 TW TW100112886A patent/TW201139093A/zh unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2011141101A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2011141101A1 (de) | 2011-11-17 |
CN102971122A (zh) | 2013-03-13 |
TW201139093A (en) | 2011-11-16 |
EP2569131B1 (de) | 2015-09-23 |
DE102010020293A1 (de) | 2011-11-17 |
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