WO2001019603A1 - Method and device for the production of edge closures in sandwich panels - Google Patents

Method and device for the production of edge closures in sandwich panels Download PDF

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Publication number
WO2001019603A1
WO2001019603A1 PCT/CH1999/000439 CH9900439W WO0119603A1 WO 2001019603 A1 WO2001019603 A1 WO 2001019603A1 CH 9900439 W CH9900439 W CH 9900439W WO 0119603 A1 WO0119603 A1 WO 0119603A1
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WO
WIPO (PCT)
Prior art keywords
edge
tool
cooling
hot pressing
pressing tool
Prior art date
Application number
PCT/CH1999/000439
Other languages
German (de)
French (fr)
Inventor
Robert Nolte
Original Assignee
Rono Systemtechnik Ag
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 Rono Systemtechnik Ag filed Critical Rono Systemtechnik Ag
Priority to AU55018/99A priority Critical patent/AU5501899A/en
Priority to PCT/CH1999/000439 priority patent/WO2001019603A1/en
Priority to PCT/CH2000/000405 priority patent/WO2001019604A1/en
Priority to AU58005/00A priority patent/AU5800500A/en
Publication of WO2001019603A1 publication Critical patent/WO2001019603A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/0044—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping edges or extremities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb
    • B29L2031/608—Honeycomb structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/02—Cellular or porous
    • B32B2305/024—Honeycomb

Definitions

  • the present invention relates to a method for closing the edges of sandwich panels with a honeycomb core and cover layers on both sides made of thermoplastic material, a sandwich panel processed by the method and a device for carrying out the method.
  • edge seals are predominantly made using edge banding (e.g. blockboard), edging profiles or filling the edges with subsequent sanding of the edges.
  • edge banding e.g. blockboard
  • the edges of the sandwich panel have the open honeycomb structure. This provides inadequate structural surface for attaching edge profiles or for connecting to other panels.
  • the object of the present invention is to provide a method for sealing the edges in a simple manner even more reliably in sandwich panels of the type described above. This object is achieved according to the invention in a method of the type defined in the introduction by the features of the characterizing part of claim 1. Particular embodiments of the invention are defined in the dependent claims.
  • thermoplastic core material and the cover layers (which can be reinforced with glass fibers, if necessary) are melted together in a controlled manner.
  • the contact pressure is maintained until the individual honeycomb webs lie on top of one another and consequently full material has formed.
  • These webs are thermoplastic connected to each other by the advancing hot tool.
  • the shape of the edge is determined by the shape of the hot tool. All known shapes (round, square, multi-level, oval, etc.) are possible.
  • the edge contour created during the hot pressing process can also be machined after cooling. For example, a hole can be drilled into which a threaded insert is inserted. The compacted material has now created a local situation that has a high mechanical strength.
  • the edge produced is very impact-resistant and, as an outstanding advantage, cannot be removed practically, since it is made from the composite of the plate and not from additional material. If the edge trim produced is damaged, it can be repaired simply and inexpensively by applying heated thermoplastic material (eg polypropylene) locally. After cooling, the excess material can simply be sanded mechanically.
  • heated thermoplastic material eg polypropylene
  • the invention also relates to a sandwich panel produced by the method and a device for carrying out the method.
  • the latter is characterized by the features of the characterizing part of claim 7.
  • the edge seal can also be e.g. be made as a tongue and groove connection. This makes it possible to string the sandwich panels together as required.
  • the sandwich panel is fixed on the assembly table to produce the edge seal.
  • the hot tool made of steel is located according to the desired side contour and can be rotated and moved.
  • the contour is created by controlled movement to the side of the plate by melting and running the thermoplastic material to the end. After the cooling process, the side stop is retracted and the end is made.
  • the process also works on curved or arched sandwich panels.
  • the method according to the invention places low demands on the cutting of the sandwich panel and its angularity. It is simply melted a little more at the points that do not immediately touch the hot tool. Before With large sandwich panels, precise cutting is associated with high costs. This is not necessary in the method according to the invention.
  • Fig. 1 shows purely schematically the various process steps for closing an edge of a honeycomb core panel
  • FIG. 2 shows a representation similar to FIG. 1 of a variant of the method.
  • Fig. La shows a sandwich panel with honeycomb core 1 and cover layers 2, 3 made of thermoplastic material, the right-hand edge 4 is to be completed. This is done by means of a tool 5 which can be used both as a hot pressing tool and as a cooling tool.
  • a heating medium H is passed through the channel 6 to heat the tool 5. If the tool is used for cooling, the heating medium H is replaced by a cooling medium K.
  • the panel is fixed on a table (not shown) and moved with the heated tool 5 against the edge 4 to be sealed.
  • the contact surface 7 of the tool 5 is designed such that the heated cover layer edge sections 2a, 3a are brought together and the honeycomb core edge section la (likewise heated and in melt) melts in a controlled manner under compression with the cover layer sections. This is illustrated by Fig. 1b. If the edge section created by the hot pressing process is now cooled (e.g. by the cooling tool according to Fig. Lc), the clean edge finish according to Fig. Id results.
  • the compressed core material la is fused to the cover layer material 2a, 3a (the material of the cover layer edge sections 2a, 3a can also be slightly compressed).
  • FIG. 2 of the drawing shows a variant of the method, the same reference symbols being used for the different parts as in FIG. 1.
  • the tool can be provided with an auxiliary device 8 (shown in dashed lines) if necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The invention relates to a method for the production of edge closures in sandwich panels having a honeycomb core and covering layers on both sides in which a heated pressing tool (5) is pressed onto the panel edge (4) to be processed and pressed against the edge section to be sealed until said abutting core and covering layer material have fused together in such a way that the original shape is retained.

Description

Verfahren und Vorrichtung zur Herstellung von Randabschlüssen bei SandwichpanelenMethod and device for producing edge seals in sandwich panels
Die vorliegende Erfindung betrifft ein Verfahren zum Ab- schliessen der Ränder bei Sandwichpanelen mit Wabenkern und beidseitigen Deckschichten aus thermoplastischem Material, ein nach dem Verfahren bearbeitetes Sandwichpanel und eine Vorrich- tung zur Durchführung des Verfahrens.The present invention relates to a method for closing the edges of sandwich panels with a honeycomb core and cover layers on both sides made of thermoplastic material, a sandwich panel processed by the method and a device for carrying out the method.
Bei den bisher bekannten Randabschlüssen von Sandwichpanelen kennt man vorwiegend Randabschlüsse hergestellt mittels Kanten- umleimern (z.B. Tischlerplatten), Einfassprofilen oder Spachte- lung der Kanten mit anschliessendem Schleifen der Kanten.In the edge seals of sandwich panels known to date, edge seals are predominantly made using edge banding (e.g. blockboard), edging profiles or filling the edges with subsequent sanding of the edges.
Diese bisher verwendeten Randabschlüsse brauchen immer einen Vermittler zur Haftung an der Kante, z.B. Klebstoff, um zuverlässig und dauerhaft die Kante zu verschliessen.These edge seals used up to now always need an agent to adhere to the edge, e.g. Adhesive to seal the edge reliably and permanently.
Die Kanten des Sandwichpanels besitzen bei einem Wabenpanel als Abschluss die offene Wabenstruktur. Diese stellt zum Befestigen von Randprofilen oder zur Anbindung an andere Platten nur unzureichende Strukturfläche zur Verfügung.In the case of a honeycomb panel, the edges of the sandwich panel have the open honeycomb structure. This provides inadequate structural surface for attaching edge profiles or for connecting to other panels.
Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zu schaffen, um bei Sandwichpanelen der vorstehend beschriebenen Art die Ränder auf einfache Weise noch zuverlässiger abzu- schliessen. Diese Aufgabe wird bei einem Verfahren der eingangs definierten Art erfindungsgemäss durch die Merkmale des kennzeichnenden Teils von Anspruch 1 gelöst. Besondere Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen definiert.The object of the present invention is to provide a method for sealing the edges in a simple manner even more reliably in sandwich panels of the type described above. This object is achieved according to the invention in a method of the type defined in the introduction by the features of the characterizing part of claim 1. Particular embodiments of the invention are defined in the dependent claims.
Das Verfahren kommt ohne zusätzliche Haftmittel aus. Durch gezieltes Erwärmen und Andrücken mittels eines speziellen Heiss- werkzeuges kommt es zum kontrollierten Zusammenschmelzen des thermoplastischen Kernmaterials und der Deckschichten (welche gegebenenfalls mit Glasfasern verstärkt sein können) .The process does not require any additional adhesive. Through targeted heating and pressing using a special hot tool, the thermoplastic core material and the cover layers (which can be reinforced with glass fibers, if necessary) are melted together in a controlled manner.
Der Anpressdruck wird solange aufrechterhalten, bis die einzelnen Wabenstege aufeinander liegen und folglich volles Material entstanden ist. Diese Stege sind durch das nachrückende Heiss- werkzeug thermoplastisch miteinander verbunden.The contact pressure is maintained until the individual honeycomb webs lie on top of one another and consequently full material has formed. These webs are thermoplastic connected to each other by the advancing hot tool.
Durch diesen Vorgang erhält man als Rand eine geschlossene Vollmaterialstruktur!This process results in a closed solid material structure as the edge!
Die Form des Randes wird durch die Form des Heisswerkzeuges bestimmt. Es sind alle bekannten Formen (rund, eckig, mehrstufig, oval, etc.) möglich.The shape of the edge is determined by the shape of the hot tool. All known shapes (round, square, multi-level, oval, etc.) are possible.
Die beim Heisspressvorgang entstandene Randkontur kann nach dem Abkühlen auch mechanisch bearbeitet werden. So kann zum Beispiel ein Loch gebohrt werden, in das ein Gewindeinsert eingesetzt wird. Durch das verdichtete Material hat man nun örtlich eine Situation geschaffen, die hohe mechanische Belastbarkeit besitzt.The edge contour created during the hot pressing process can also be machined after cooling. For example, a hole can be drilled into which a threaded insert is inserted. The compacted material has now created a local situation that has a high mechanical strength.
Der hergestellte Rand ist sehr schlagzäh und kann als herausragender Vorteil praktisch nicht abgelöst werden, da er aus dem Verbund der Platte heraus und nicht durch zusätzlich herangeführtes Material hergestellt ist. Sollte es zu einer Beschädigung des hergestellten Randabschlusses kommen, ist dieser einfach und kostengünstig durch örtliches Aufbringen von erhitztem thermoplastischem Material (z.B. Polypropylen) zu reparieren. Nach dem Abkühlen kann das über- schüssige Material einfach mechanisch geschliffen werden.The edge produced is very impact-resistant and, as an outstanding advantage, cannot be removed practically, since it is made from the composite of the plate and not from additional material. If the edge trim produced is damaged, it can be repaired simply and inexpensively by applying heated thermoplastic material (eg polypropylene) locally. After cooling, the excess material can simply be sanded mechanically.
Ebenfalls Gegenstand der Erfindung ist ein nach dem Verfahren hergestelltes Sandwichpanel und eine Vorrichtung zur Durchführung des Verfahrens. Letztere zeichnet sich durch die Merkmale des kennzeichnenden Teils von Anspruch 7 aus.The invention also relates to a sandwich panel produced by the method and a device for carrying out the method. The latter is characterized by the features of the characterizing part of claim 7.
Durch verschieden konstruierte Heisspresswerkzeuge kann der Randabschluss auch z.B. als Nut- und Federverbindung hergestellt werden. So wird es möglich, die hergestellten Sandwichplatten beliebig aneinanderzureihen.The edge seal can also be e.g. be made as a tongue and groove connection. This makes it possible to string the sandwich panels together as required.
Zur Herstellung des Randabschlusses wird die Sandwichplatte auf dem Montagetisch fixiert. An einem z.B. dreh- und verschiebbaren Seitenanschlag befindet sich das entsprechend der gewünschten Seitenkontur befindliche Heisswerkzeug aus Stahl. Durch gesteuertes Anfahren an die Seite der Platte wird durch das Abschmelzen und Verlaufen des thermoplastischen Materials bis zum vollen Abschluss die Kontur hergestellt. Nach dem Abkühlvorgang wird der Seitenanschlag zurückgefahren und der Abschluss ist hergestellt .The sandwich panel is fixed on the assembly table to produce the edge seal. On a e.g. The hot tool made of steel is located according to the desired side contour and can be rotated and moved. The contour is created by controlled movement to the side of the plate by melting and running the thermoplastic material to the end. After the cooling process, the side stop is retracted and the end is made.
Das Verfahren funktioniert auch an gebogenen bzw. überwölbten Sandwichplatten.The process also works on curved or arched sandwich panels.
Darüber hinaus stellt das erfindungsgemässe Verfahren einen geringen Anspruch an den Zuschnitt der Sandwichplatte und deren Winkligkeit. Es wird einfach etwas mehr an den Stellen angeschmolzen, die nicht sofort am Heisswerkzeug anliegen. Vor al- lern bei grossen Sandwichplatten ist ein genauer Zuschnitt mit hohen Kosten verbunden. Dieser ist beim erfindungsgemässen Verfahren nicht notwendig.In addition, the method according to the invention places low demands on the cutting of the sandwich panel and its angularity. It is simply melted a little more at the points that do not immediately touch the hot tool. Before With large sandwich panels, precise cutting is associated with high costs. This is not necessary in the method according to the invention.
Die Erfindung wird nachstehend anhand von in der Zeichnung dar- gestellten Ausführungsbeispielen noch etwas näher erläutert.The invention is explained in more detail below with reference to exemplary embodiments shown in the drawing.
Es zeigt:It shows:
Fig. 1 rein schematisch die verschiedenen Verfahrensschritte zum Abschliessen eines Randes eines Wabenkernpanels, undFig. 1 shows purely schematically the various process steps for closing an edge of a honeycomb core panel, and
Fig. 2 eine ähnliche Darstellung wie Fig. 1 einer Variante des Verfahrens .FIG. 2 shows a representation similar to FIG. 1 of a variant of the method.
Fig. la zeigt ein Sandwichpanel mit Wabenkern 1 und Deckschichten 2, 3 aus thermoplastischem Material, dessen rechtsseitiger Rand 4 abgeschlossen werden soll. Dies erfolgt mittels eines Werkzeuges 5, das sowohl als Heisspresswerkzeug als auch als Kühlwerkzeug einsetzbar ist.Fig. La shows a sandwich panel with honeycomb core 1 and cover layers 2, 3 made of thermoplastic material, the right-hand edge 4 is to be completed. This is done by means of a tool 5 which can be used both as a hot pressing tool and as a cooling tool.
Zum Aufheizen des Werkzeuges 5 wird ein Heizmedium H durch den Kanal 6 geführt. Wenn das Werkzeug zum Kühlen gebraucht wird, wird das Heizmedium H durch ein Kühlmedium K ersetzt.A heating medium H is passed through the channel 6 to heat the tool 5. If the tool is used for cooling, the heating medium H is replaced by a cooling medium K.
Das Panel wird auf einem Tisch (nicht dargestellt) fixiert und mit dem erwärmten Werkzeug 5 gegen den abzuschliessenden Rand 4 gefahren. Die Kontaktfläche 7 des Werkzeuges 5 ist so ausgebildet, dass die erwärmten Deckschichtrandabschnitte 2a, 3a zusammengeführt werden und der Wabenkernrandabschnitt la (ebenfalls erhitzt und in Schmelze) unter Verdichtung mit den Deckschichtabschnitten kontrolliert zusammenschmilzt . Dies wird durch Fig. lb veranschaulicht. Wenn nun der durch den Heisspressvorgang entstandene Randabschnitt abgekühlt wird (z.B. durch das KühlWerkzeug nach Fig. lc) , resultiert der saubere Randabschluss nach Fig. Id.The panel is fixed on a table (not shown) and moved with the heated tool 5 against the edge 4 to be sealed. The contact surface 7 of the tool 5 is designed such that the heated cover layer edge sections 2a, 3a are brought together and the honeycomb core edge section la (likewise heated and in melt) melts in a controlled manner under compression with the cover layer sections. This is illustrated by Fig. 1b. If the edge section created by the hot pressing process is now cooled (e.g. by the cooling tool according to Fig. Lc), the clean edge finish according to Fig. Id results.
Dabei ist das verdichtete Kernmaterial la mit dem Deckschicht- material 2a, 3a verschmolzen (auch das Material der Deckschichtrandabschnitte 2a, 3a kann noch leicht verdichtet werden) .The compressed core material la is fused to the cover layer material 2a, 3a (the material of the cover layer edge sections 2a, 3a can also be slightly compressed).
Fig. 2 der Zeichnung zeigt eine Verfahrensvariante, wobei für die verschiedenen Teile dieselben Ueberweisungszeichen verwen- det wurden wie in Fig. 1.FIG. 2 of the drawing shows a variant of the method, the same reference symbols being used for the different parts as in FIG. 1.
Um zu verhindern, dass die Randabschnitte 2a, 3a der Deckschichten nach aussen ausweichen, kann das Werkzeug bei Bedarf mit einer Hilfseinrichtung 8 (gestrichelt dargestellt) versehen sein. In order to prevent the edge sections 2a, 3a of the cover layers from escaping to the outside, the tool can be provided with an auxiliary device 8 (shown in dashed lines) if necessary.

Claims

Patentansprüche claims
1. Verfahren zum Abschliessen der Ränder bei Sandwichpanelen mit Wabenkern und beidseitigen Deckschichten aus thermoplastischem Material, dadurch gekennzeichnet, dass auf die zu ver- schliessenden Randabschnitte von der Seite her ein Heisspresswerkzeug aufgesetzt und dieses im erwärmten Zustand solange gegen den Randabschnitt angedrückt wird, bis das anliegende Kern- und Deckschichtenmaterial unter teilweiser Verdichtung zusammengeschmolzen ist.1. Method for closing the edges in sandwich panels with honeycomb core and cover layers on both sides made of thermoplastic material, characterized in that a hot pressing tool is placed from the side onto the edge sections to be closed and this is pressed against the edge section in the heated state until the adjacent core and cover layer material is melted together with partial compression.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass an- schliessend an das Zusammenschmelzen des thermoplastischen Kern- und Deckschichtenmaterials das zusammengeschmolzene Material kontrolliert abgekühlt wird.2. The method according to claim 1, characterized in that subsequent to the melting of the thermoplastic core and cover layer material, the melted material is cooled in a controlled manner.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Abkühlung unter Verwendung eines Kühlwerkzeuges erfolgt.3. The method according to claim 2, characterized in that the cooling takes place using a cooling tool.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass das Heisspresswerkzeug für die Abkühlung als Kühlwerkzeug verwendet wird.4. The method according to claim 3, characterized in that the hot pressing tool is used for cooling as a cooling tool.
5. Verfahren nach einem der Ansprüche 1 - 4, dadurch gekenn- zeichnet, dass die Form der Kontaktfläche des Heisspresswerk- zeuges ein beliebig wählbares Profil aufweist .5. The method according to any one of claims 1-4, characterized in that the shape of the contact surface of the hot pressing tool has an arbitrarily selectable profile.
6. Sandwichpanel mit Wabenkern und beidseitigen Deckschichten aus thermoplastischem Material, hergestellt nach dem Verfahren nach einem der Ansprüche 1 - 5.6. sandwich panel with honeycomb core and double-sided cover layers made of thermoplastic material, produced by the method according to any one of claims 1-5.
7. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 - 5, gekennzeichnet durch einen Tisch zum Auflegen und vorübergehenden Festhalten eines zu bearbeitenden Sandwich- panels und durch ein Heisspresswerkzeug, welches zur Herstellung eines Plattenrandabschlusses an den Rand des Panels gesteuert heranfahrbar ist.7. Device for carrying out the method according to any one of claims 1-5, characterized by a table for placing and temporarily holding a sandwich to be processed panels and by means of a hot pressing tool which can be brought up to the edge of the panel in a controlled manner in order to produce a panel edge closure.
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass das Heisspresswerkzeug sowohl als Heizwerkzeug als auch als KühlWerkzeug ausgebildet ist . 8. The device according to claim 7, characterized in that the hot pressing tool is designed both as a heating tool and as a cooling tool.
PCT/CH1999/000439 1999-09-16 1999-09-16 Method and device for the production of edge closures in sandwich panels WO2001019603A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU55018/99A AU5501899A (en) 1999-09-16 1999-09-16 Method and device for the production of edge closures in sandwich panels
PCT/CH1999/000439 WO2001019603A1 (en) 1999-09-16 1999-09-16 Method and device for the production of edge closures in sandwich panels
PCT/CH2000/000405 WO2001019604A1 (en) 1999-09-16 2000-07-26 Method and device for the production of edge closures in sandwich panels
AU58005/00A AU5800500A (en) 1999-09-16 2000-07-26 Method and device for the production of edge closures in sandwich panels

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PCT/CH1999/000439 WO2001019603A1 (en) 1999-09-16 1999-09-16 Method and device for the production of edge closures in sandwich panels

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WO2009125291A2 (en) * 2008-04-11 2009-10-15 Innovida Factories, Ltd. Sandwich panel with closed edge and methods of fabricating
US8733033B2 (en) 2008-06-27 2014-05-27 Millport Associates, SA Sandwich panel ground anchor and ground preparation for sandwich panel structures
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Cited By (12)

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NL1031771C2 (en) * 2006-05-08 2007-11-09 Fits Holding B V Connecting thermoplastic sandwich panels.
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