DE102008058534A1 - Sandwich structure for use in booth and store constructions, has core layer arranged between two surface layers, where one of core and surface layers is formed from material, which consists of polylactide or polylactic acid or corn starch - Google Patents

Sandwich structure for use in booth and store constructions, has core layer arranged between two surface layers, where one of core and surface layers is formed from material, which consists of polylactide or polylactic acid or corn starch Download PDF

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DE102008058534A1
DE102008058534A1 DE102008058534A DE102008058534A DE102008058534A1 DE 102008058534 A1 DE102008058534 A1 DE 102008058534A1 DE 102008058534 A DE102008058534 A DE 102008058534A DE 102008058534 A DE102008058534 A DE 102008058534A DE 102008058534 A1 DE102008058534 A1 DE 102008058534A1
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sandwich structure
core layer
structure according
surface layers
polylactide
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Carolus Bremer
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    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B3/18—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 an internal layer formed of separate pieces of material which are juxtaposed side-by-side
    • B32B3/20—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 an internal layer formed of separate pieces of material which are juxtaposed side-by-side of hollow pieces, e.g. tubes; of pieces with channels or cavities
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/02—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising animal or vegetable substances, e.g. cork, bamboo, starch
    • 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
    • B32B2250/03—3 layers
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • 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
    • B32B2419/00—Buildings or parts thereof
    • 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
    • B32B2439/00—Containers; Receptacles
    • 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
    • B32B2479/00—Furniture
    • 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
    • B32B2605/00—Vehicles
    • B32B2605/08—Cars
    • 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
    • B32B2605/00—Vehicles
    • B32B2605/18—Aircraft

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Laminated Bodies (AREA)

Abstract

The sandwich structure has a core layer (3) arranged between two surface layers (1, 2), where one of the core and surface layers is formed from a material, which consists of polylactide or polylactic acid or corn starch. The core layer is formed by tube elements (31) arranged perpendicular to the surface layers, where the tube elements have a round, oval, triangular, square, hexagonal, octagonal or multiangular or an irregular cross-sectional shape. The core layer has a honeycomb structure. An independent claim is also included for a method for producing a sandwich structure.

Description

Die Erfindung betrifft eine Sandwich- oder Compositestruktur, die mindestens zwei Deckschichten sowie eine zwischen diesen angeordnete Kernschicht aufweist und insbesondere zur Herstellung von Platten vorteilhaft anwendbar ist. Die Erfindung betrifft ferner ein Verfahren zur Herstellung einer solchen Sandwichstruktur.The The invention relates to a sandwich or composite structure which is at least two outer layers and a core layer arranged between them and in particular for the production of plates advantageous is applicable. The invention further relates to a process for the preparation such a sandwich structure.

Sandwichstrukturen dieser Art sind bekannt. Sie zeichnen sich durch ein besonders geringes Gewicht bei gleichzeitig relativ hoher Festigkeit aus und haben deshalb eine weite Verbreitung auf zahlreichen Anwendungsgebieten gefunden. Die Deckschichten können aus den verschiedensten metallischen oder nichtmetallischen Materialien hergestellt sein. Die Kernschicht stellt häufig eine Mischung aus metallischen Fasern und/oder Kunststoff-Fasern mit Klebstoff dar.sandwich structures of this kind are known. They are characterized by a particularly low Weight while maintaining relatively high strength and have therefore a wide spread in many fields of application found. The cover layers can from a variety of metallic or non-metallic materials be prepared. The core layer is often a mixture of metallic Fibers and / or plastic fibers with adhesive.

Für bestimmte Anwendungen, bei denen nicht nur ein geringes Gewicht bei hoher Festigkeit, sondern insbesondere auch eine optisch und ästhetisch ansprechende Erscheinung von Bedeutung ist, besteht häufig der Wunsch, eine Sandwichstruktur zur Verfügung zu haben, die transparent oder zumindest lichtdurchlässig ist oder in verschiedenen Farben und Oberflächenstrukturen ausgeführt werden kann.For certain Applications where not only low weight at high Strength, but especially a visual and aesthetic appealing appearance is of importance, is often the Desire to have a sandwich structure available that is transparent or at least translucent is or can be executed in different colors and surface textures.

Weiterhin hat sich in zunehmendem Maße die Notwendigkeit gezeigt, Sandwichstrukturen nach ihrer Verwendung umweltfreundlich zu entsorgen bzw. zu recyceln. Dies kann jedoch insbesondere in dem Fall, in dem die Sandwichstrukturen eine Vielzahl unterschiedlicher Materialien enthalten, relativ aufwändig sein und hohe Kosten verursachen, da die Sandwichstrukturen einen festen Verbund ihrer Bestandteile bilden, der nicht ohne weiteres wieder getrennt werden kann.Farther has increasingly the Need demonstrated sandwich structures after their use environmentally friendly to dispose of or recycle. This can, however in particular in the case where the sandwich structures have a plurality containing different materials, be relatively expensive and high costs, since the sandwich structures a solid Composite of their constituents, which does not readily recover can be separated.

Eine Aufgabe, die der Erfindung zugrunde liegt, besteht deshalb darin, nach einer Möglichkeit zu suchen, mit der eine Sandwichstruktur in relativ einfacher Weise transparent oder zumindest lichtdurchlässig und/oder in verschiedenen Farben und Oberflächenstrukturen hergestellt werden kann.A The object underlying the invention is therefore to for a way to looking for a sandwich structure in a relatively simple way transparent or at least translucent and / or in different Colors and surface structures can be produced.

Eine weitere Aufgabe, die der Erfindung zugrunde liegt, besteht darin, eine Sandwichstruktur der oben genannten Art zu schaffen, die auf einfache und relativ kostengünstige Weise umweltgerecht entsorgt bzw. recycelt werden kann.A Another object on which the invention is based is that to create a sandwich structure of the kind mentioned above simple and relatively inexpensive Can be disposed of or recycled in an environmentally sound manner.

Gelöst werden diese Aufgaben mit einer Sandwichstruktur, die mindestens zwei Deckschichten sowie eine zwischen diesen angeordnete Kernschicht aufweist, dadurch, dass mindestens eine dieser drei Schichten aus einem Material gebildet ist, das aus PLA (d. h. Polylactid oder Polymilchsäure oder Maisstärke) besteht oder dieses aufweist oder daraus hergestellt ist.Be solved These tasks involve a sandwich structure that has at least two facings and a core layer arranged between them, characterized that at least one of these three layers is formed from a material is that of PLA (i.e., polylactide or polylactic acid or Corn starch) is or has or is made of it.

Die Aufgabe wird ferner mit einem Verfahren zur Herstellung einer Sandwichstruktur gelöst, das sich dadurch auszeichnet, dass als Ausgangsmaterial zur Herstellung mindestens einer der drei Schichten PLA (d. h. Polylactid oder Polymilchsäure oder Maisstärke) verwendet wird.The Task is further with a method for producing a sandwich structure solved, which is characterized in that as starting material for the production at least one of the three layers of PLA (i.e., polylactide or polylactic acid or corn starch) is used becomes.

Ein besonderer Vorteil von aus PLA bzw. Polylactid, Polymilchsäure oder Maisstärke bestehenden Sandwichstrukturen besteht darin, dass sie CO2 neutral hergestellt und biologisch wieder abgebaut werden können.A particular advantage of sandwich structures consisting of PLA or polylactide, polylactic acid or corn starch is that they can be produced CO 2 neutral and biodegraded again.

Ferner kann PLA bei der Herstellung sehr intensiv und gleichmäßig durchfärbt werden, so dass sich in optisch-farblicher Hinsicht hochwertige Oberflächen der Sandwichstruktur erzielen lassen.Further PLA can be colored very intensively and uniformly in the production, so that in terms of visual-color quality surfaces of the Achieve sandwich structure.

Durch die Wahl von PLA können Sandwichstrukturen geschaffen werden, die insbesondere dann, wenn alle drei Schichten daraus hergestellt sind (siehe Anspruch 2), zahlreiche Vorteile miteinander vereinen. Diese bestehen beispielsweise darin, dass mit relativ geringen Kosten eine Sandwichstruktur mit besonders hoher Biegesteifigkeit, Bruchfestigkeit und Stabilität hergestellt werden kann, die gleichzeitig in optischer Hinsicht weitgehend Acryl-ähnliche Eigenschaften aufweist.By the choice of PLA can Sandwich structures are created, in particular when all three layers are made therefrom (see claim 2), to combine numerous advantages. These consist for example in that at relatively low cost a sandwich structure with particularly high flexural strength, breaking strength and stability can be, at the same time in optical terms largely acrylic-like properties having.

Zudem können solche Sandwichstrukturen wesentlich einfacher und umweltfreundlicher recycelt oder entsorgt werden als dies mit Acryl- oder anderen Materialien oder insbesondere dann möglich ist, wenn die Sandwichstruktur aus unterschiedlichen Materialien besteht.moreover can Such sandwich structures much easier and more environmentally friendly recycled or disposed of with acrylic or other materials or especially possible is when the sandwich structure of different materials consists.

Die Unteransprüche haben vorteilhafte Weiterbildungen der Erfindung zum Inhalt.The under claims have advantageous developments of the invention to the content.

Die Ausführung gemäß Anspruch 2 hat insbesondere den Vorteil, dass zum Recyclen oder Entsorgen der Sandwichstrukturen keine Materialtrennung erforderlich ist, und dass die Entsorgung zum Beispiel durch Zerkleinern und Kompostierung erfolgen kann, da PLA bzw. Polylactid, Polymilchsäure und Maisstärke biologisch gut abbaubar sind.The execution according to claim 2 has the particular advantage that for recycling or disposal the sandwich structures no material separation is required and that disposal, for example, by crushing and composting can be done because PLA or polylactide, polylactic acid and corn starch are readily biodegradable.

Mit der im wesentlichen wabenförmigen Struktur der Kernschicht gemäß den Unteransprüchen 3 und 4 kann bei besonders geringem Gewicht eine hohe Festigkeit und Biegesteifigkeit der Sandwichstruktur erzielt werden.With the substantially honeycomb structure the core layer according to the subclaims 3 and 4 can with a very low weight high strength and flexural rigidity the sandwich structure can be achieved.

Die Unteransprüche 5 bis 7 beinhalten bevorzugte Elemente zum Aufbau der Kernschicht sowie deren Verbindung miteinander bzw. mit den Deckschichten.The dependent claims 5 to 7 contain preferred elements for the construction of the core layer and their connection with each other or with the Facings.

Der Unteranspruch 8 beinhaltet eine alternative Ausführung der Kernschicht, die insbesondere dann bevorzugt wird, wenn die Sandwichstruktur eine relativ geringe Dicke haben soll.Of the Subclaim 8 includes an alternative embodiment of the core layer, the is particularly preferred when the sandwich structure a should have relatively small thickness.

Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung von bevorzugten Ausführungsformen anhand der Zeichnung. Es zeigt:Further Details, features and advantages of the invention will become apparent the following description of preferred embodiments with reference to the drawing. It shows:

1: eine schematische dreidimensionale Darstellung eines Teils einer Sandwichstruktur gemäß der Erfindung. 1 a schematic three-dimensional representation of a part of a sandwich structure according to the invention.

Die in 1 gezeigte Sandwichstruktur umfasst eine erste Deckschicht 1 und eine zweite Deckschicht 2, zwischen denen sich eine Kernschicht 3 befindet. Sowohl die Deckschichten 1, 2, als auch die Kernschicht 3 sind bevorzugt aus PLA, insbesondere Maisstärke hergestellt. Zur Erzielung einer hohen Biegesteifigkeit sowie einer hohen Bruchfestigkeit und Stabilität ist die Kernschicht bevorzugt in Form einer Wabenstruktur aufgebaut. Die Wabenstruktur setzt sich aus im wesentlichen senkrecht zu den Deckschichten angeordneten Röhrenelementen 31 zusammen (oder weist solche Röhrenelemente 31 auf), die eine regelmäßige, insbesondere runde, ovale, dreieckige, viereckige, sechseckige, achteckige oder andere vieleckige Querschnittsform oder eine unregelmäßige Querschnittsform aufweisen können, wobei die Durchmesser bzw. Querschnittsflächen und/oder Querschnittsformen der Röhrenelemente 31 in einer Kernschicht 3 gleich oder verschieden sein können.In the 1 The sandwich structure shown comprises a first cover layer 1 and a second cover layer 2 , between which there is a core layer 3 located. Both the cover layers 1 . 2 , as well as the core layer 3 are preferably made of PLA, especially corn starch. To achieve a high flexural rigidity and a high breaking strength and stability, the core layer is preferably constructed in the form of a honeycomb structure. The honeycomb structure is composed of tube elements arranged essentially perpendicular to the cover layers 31 together (or has such tube elements 31 on), which may have a regular, in particular round, oval, triangular, quadrangular, hexagonal, octagonal or other polygonal cross-sectional shape or an irregular cross-sectional shape, wherein the diameters or cross-sectional areas and / or cross-sectional shapes of the tube elements 31 in a core layer 3 may be the same or different.

Vorzugsweise liegen einzelne oder alle Röhrenelemente 31 mit ihren Längsseiten zumindest teilweise aneinander an und sind dabei an den Längsseiten vorzugsweise miteinander verklebt oder in anderer Weise aneinander befestigt.Preferably, individual or all tube elements 31 with their long sides at least partially against each other and are preferably glued to each other at the longitudinal sides or attached to each other in any other way.

Der Verbund zwischen der Kernschicht 3 und den Deckschichten 1, 2 kann durch Klebstoffe oder verschiedene Schweißverfahren in bekannter Weise hergestellt werden. Einzelne oder alle Röhrenelemente 31 können beispielsweise mit ihren beiden stirnseitigen Enden mit der ersten bzw. zweiten Deckschicht 1; 2 verklebt sein.The bond between the core layer 3 and the cover layers 1 . 2 can be prepared by adhesives or various welding methods in a known manner. Single or all tube elements 31 For example, with their two front ends with the first and second cover layer 1 ; 2 be glued.

Alternativ dazu ist es auch möglich, die Kernschicht 3 aus einer Mischung aus PLA-Granulat mit einem geeigneten Klebstoff zu bilden.Alternatively, it is also possible to use the core layer 3 from a mixture of PLA granules with a suitable adhesive to form.

Die Ausführung der Kernschicht 3 hängt im wesentlichen von dem vorgesehenen Anwendungszweck ab. Die oben genannte Wabenstruktur hat zum Beispiel den Vorteil, dass bei relativ geringem Gewicht eine hohe Festigkeit, d. h. insbesondere Biegesteifigkeit (E-Modul), Bruchfestigkeit und Stabilität, in Verbindung mit einer guten Transparenz der Sandwichstruktur erzielt werden kann.The execution of the core layer 3 depends essentially on the intended application. The above-mentioned honeycomb structure has the advantage, for example, that at a relatively low weight, high strength, ie in particular flexural rigidity (modulus of elasticity), breaking strength and stability, can be achieved in conjunction with good transparency of the sandwich structure.

Wenn eine relativ geringe Dicke der Sandwichstruktur gewünscht ist, kann, insbesondere aus Gründen der einfacheren Herstellbarkeit, eine Kernschicht in Form einer Mischung aus PLA-Granulat und Klebstoff vorteilhaft sein.If a relatively small thickness of the sandwich structure is desired, can, especially for reasons the ease of manufacture, a core layer in the form of a Be advantageous mixture of PLA granules and adhesive.

Gegebenenfalls können im Falle der erläuterten Wabenstruktur die vorhandenen Hohlräume innerhalb der Röhrenelemente 31 und/oder Zwischenräume zwischen den Röhrenelementen 31 auch ganz oder teilweise durch eine solche Mischung ausgefüllt sein.Optionally, in the case of the illustrated honeycomb structure, the existing cavities within the tube elements 31 and / or spaces between the tube elements 31 also be completely or partially filled by such a mixture.

Schließlich ist es auch möglich, dass nur bestimmte, sich in der Ebene der Sandwichstruktur erstreckende Teilbereiche der Kernschicht eine solche Mischung aufweisen, während die übrigen Bereiche durch die oben genannte Wabenstruktur bzw. die Röhrenelemente 31 gebildet sind. Damit können in der Ebene der Sandwichstruktur unterschiedliche Eigenschaften erzielt werden.Finally, it is also possible for only certain subregions of the core layer extending in the plane of the sandwich structure to have such a mixture, while the remaining regions are provided by the abovementioned honeycomb structure or the tube elements 31 are formed. Thus, different properties can be achieved in the plane of the sandwich structure.

Die beiden Deckschichten sind in üblicher Weise in Form von kompakten Platten hergestellt und haben zum Beispiel eine Dicke von zwischen etwa 0,5 mm und etwa 3 mm. Die Dicke der Kernschicht beträgt dabei zwischen etwa 0,2 mm und etwa 4 mm. Die Röhrenelemente haben zum Beispiel einen Durchmesser von zwischen etwa 2 mm und etwa 50 mm.The Both layers are in the usual way made in the form of compact plates and have, for example a thickness of between about 0.5 mm and about 3 mm. The thickness of the Core layer is between about 0.2 mm and about 4 mm. The tube elements have, for example a diameter of between about 2 mm and about 50 mm.

Zur Herstellung der Deckschichten 1, 2 sowie der Kernschicht 3 bzw. des Granulates für die Kernschicht aus PLA können übliche, aus der Kunststoffverarbeitung bekannte Verfahren angewendet werden. Auch die Herstellung der Sandwichstruktur, d. h. des Verbundes aus den Deckschichten mit der dazwischen liegenden Kernschicht kann mit bekannten Verfahren vorgenommen werden.For the production of the outer layers 1 . 2 as well as the core layer 3 or of the granules for the core layer made of PLA, it is possible to use customary processes known from plastics processing. Also, the production of the sandwich structure, ie the composite of the outer layers with the intermediate core layer can be made by known methods.

Mit der erfindungsgemäßen Materialauswahl können insbesondere Sandwichstrukturen für Anwendungen mit hohen ästhetischen Anforderungen, d. h. insbesondere für Einsätze in Sichtanwendungen hergestellt werden. Sie sind somit insbesondere für den Messe- und Ladenbau, sowie in den Bereichen Architektur, Verpackungsindustrie, Automobilindustrie, Möbel und Design-Gegenstände sowie im Flugzeug- und Schiffbau vorteilhaft anwendbar.With the material selection according to the invention can in particular Sandwich structures for Applications with high aesthetic Requirements, d. H. especially for use in visual applications become. They are therefore especially for trade fairs and shopfitting, as well as in the fields of architecture, packaging industry, automotive industry, Furniture and Design objects as well as in the aircraft and Shipbuilding advantageous applicable.

Claims (10)

Sandwichstruktur, die mindestens zwei Deckschichten (1, 2) sowie eine zwischen diesen angeordnete Kernschicht (3) aufweist, dadurch gekennzeichnet, dass mindestens eine dieser drei Schichten (1, 2, 3) aus einem Material gebildet ist, das aus PLA (d. h. Polylactid oder Polymilchsäure oder Maisstärke) besteht oder dieses aufweist oder daraus hergestellt ist.Sandwich structure comprising at least two outer layers ( 1 . 2 ) and a core layer ( 3 ), characterized in that at least one of these three Schich th ( 1 . 2 . 3 ) is formed from a material consisting of or comprising PLA (ie polylactide or polylactic acid or corn starch) or produced therefrom. Sandwichstruktur nach Anspruch 1, bei der alte drei Schichten (1, 2, 3) aus PLA bestehen oder dieses aufweisen oder daraus hergestellt sind.Sandwich structure according to claim 1, in which old three layers ( 1 . 2 . 3 ) consist of or comprise PLA or are made thereof. Sandwichstruktur nach Anspruch 1, bei der die Kernschicht (3) eine wabenförmige Struktur aufweist.Sandwich structure according to claim 1, in which the core layer ( 3 ) has a honeycomb-shaped structure. Sandwichstruktur nach Anspruch 1, bei der die Kernschicht (3) durch eine Mehrzahl von im wesentlichen senkrecht zu den Deckschichten angeordneten Röhrenelementen (31) gebildet ist oder solche Röhrenelemente (31) aufweist.Sandwich structure according to claim 1, in which the core layer ( 3 ) by a plurality of tube elements arranged substantially perpendicular to the cover layers ( 31 ) or such tube elements ( 31 ) having. Sandwichstruktur nach Anspruch 4, bei der die Röhrenelemente (31) eine regelmäßige runde, ovale, dreieckige, viereckige, sechseckige, achteckige oder andere vieleckige oder eine unregelmäßige Querschnittsform aufweisen.Sandwich structure according to claim 4, in which the tube elements ( 31 ) have a regular round, oval, triangular, quadrangular, hexagonal, octagonal or other polygonal or irregular cross-sectional shape. Sandwichstruktur nach Anspruch 4, bei der einige oder alle Röhrenelemente (31) an ihren Längsseiten miteinander verklebt sind.Sandwich structure according to Claim 4, in which some or all of the tubular elements ( 31 ) are glued together on their longitudinal sides. Sandwichstruktur nach Anspruch 4, bei der einige oder alle Röhrenelemente (31) mit ihren beiden Stirnseiten mit der ersten bzw. zweiten Deckschicht (1; 2) verklebt sind.Sandwich structure according to Claim 4, in which some or all of the tubular elements ( 31 ) with its two end faces with the first and second cover layer ( 1 ; 2 ) are glued. Sandwichstruktur nach Anspruch 1, bei der die Kernschicht (3) durch eine Mischung von PLA-Granulat mit einem Klebstoff gebildet ist oder eine solche Mischung aufweist.Sandwich structure according to claim 1, in which the core layer ( 3 ) is formed by a mixture of PLA granules with an adhesive or comprises such a mixture. Sandwichstruktur nach Anspruch 1, bei der die Kernschicht (3) mit den Deckschichten (1, 2) mittels Klebstoffen oder durch Schweißverfahren verbunden ist.Sandwich structure according to claim 1, in which the core layer ( 3 ) with the cover layers ( 1 . 2 ) is bonded by means of adhesives or by welding. Verfahren zur Herstellung einer Sandwichstruktur nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass als Ausgangsmaterial zur Herstellung mindestens einer der drei Schichten PLA (d. h. Polylactid oder Polymilchsäure oder Maisstärke) verwendet wird.Process for producing a sandwich structure according to one of the preceding claims, characterized that as starting material for the production of at least one of the three Layers of PLA (i.e., polylactide or polylactic acid or corn starch) are used becomes.
DE102008058534A 2008-11-21 2008-11-21 Sandwich structure for use in booth and store constructions, has core layer arranged between two surface layers, where one of core and surface layers is formed from material, which consists of polylactide or polylactic acid or corn starch Withdrawn DE102008058534A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11628633B2 (en) * 2016-02-08 2023-04-18 Textron Innovations Inc. Composite wing structure and methods of manufacture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11628633B2 (en) * 2016-02-08 2023-04-18 Textron Innovations Inc. Composite wing structure and methods of manufacture

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