EP2186940B1 - Method for continuous production of impregnated paper honeycomb - Google Patents
Method for continuous production of impregnated paper honeycomb Download PDFInfo
- Publication number
- EP2186940B1 EP2186940B1 EP09013677A EP09013677A EP2186940B1 EP 2186940 B1 EP2186940 B1 EP 2186940B1 EP 09013677 A EP09013677 A EP 09013677A EP 09013677 A EP09013677 A EP 09013677A EP 2186940 B1 EP2186940 B1 EP 2186940B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- paper
- honeycomb
- impregnation
- paper honeycomb
- honeycombs
- 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.)
- Not-in-force
Links
- 238000000034 method Methods 0.000 title claims description 39
- 238000010924 continuous production Methods 0.000 title claims description 5
- 241000264877 Hippospongia communis Species 0.000 claims description 92
- 238000005470 impregnation Methods 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 24
- 229920005749 polyurethane resin Polymers 0.000 claims description 22
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000002904 solvent Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000011162 core material Substances 0.000 claims description 6
- 238000011282 treatment Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000004090 dissolution Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000003960 organic solvent Substances 0.000 claims description 2
- 238000003618 dip coating Methods 0.000 claims 1
- 238000001704 evaporation Methods 0.000 claims 1
- 230000008020 evaporation Effects 0.000 claims 1
- 238000003860 storage Methods 0.000 claims 1
- 239000000123 paper Substances 0.000 description 71
- 238000007493 shaping process Methods 0.000 description 7
- 239000012876 carrier material Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 239000007858 starting material Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000012779 reinforcing material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000009969 flowable effect Effects 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011877 solvent mixture Substances 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 229920001410 Microfiber Polymers 0.000 description 1
- 229920002396 Polyurea Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000003658 microfiber Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
- D21H17/57—Polyureas; Polyurethanes
Definitions
- the invention relates to a method for the continuous production of impregnated paper honeycombs according to the preamble of patent claim 1 and to a water-resistant paper honeycomb material according to the preamble of patent claim 7.
- the paper honeycomb is a lightweight core material, usually of a six-sided structure, which has excellent strength properties with low weight.
- the paper honeycombs are ideal as core material for sandwich constructions in furniture, doors and other components. The applications of honeycomb are therefore very versatile.
- paper honeycombs are currently limited in their use in that they may not be exposed to moisture, for example, since this reduces the structural strength of the paper honeycombs and ultimately destroys them. Limited applications therefore take place where materials with a paper honeycomb core are exposed to the weather or where there is a risk of damage due to condensation, for example in components in vehicle construction.
- Honeycomb structures made of plastic or aluminum are currently being preferred in the areas mentioned above in order to ensure the stability of the material. Indeed These materials have the disadvantage of being expensive, which is why the use of paper honeycomb offers significant savings and weight advantages here. Especially in vehicle construction is a reduction of the vehicle weight in terms of its consumption characteristics an intensively pursued design goal.
- the DE 102006016943 A1 therefore proposes an impregnation treatment in which the paper honeycomb is impregnated by dipping or spraying the paper.
- Polyurethane or polyester plastics lacquers which may consist of one- or two-component material, are proposed for the impregnation.
- DE 10 2004 059 103 A1 also a sandwich material to be installed in the waterproof paper honeycomb, wherein the effect of water resistance is given as given. This document focuses on the composition of the sandwich material and less on the impregnation of the paper honeycomb.
- a reinforcing material and a method for its production is known in which a cardboard-based carrier also undergoes impregnation.
- the cut into the desired shape and size reinforcing material is impregnated by spraying or pour over a diisocyanate, with an integral concentration profile of the resin over the cross section of the carrier material is desired.
- the support material is subjected to a thermal treatment in a range between 120 and 190 degrees Celsius, whereby the polymerization takes place in a period of about 40 seconds to 3 minutes.
- the carrier material and the polyurea forming in the carrier material are deformable, for example in heated shaping tools, which is why in this process during the polymerization the shaping process of the reinforcing material takes place.
- the disadvantage here is that the impregnation of the carrier material must be done in close temporal combination with the shaping for use, for example, for bonding with a matching body panel. After completion of the polymerization, a corresponding shaping would no longer be possible. This means that the impregnation of the substrate and the shaping must also coincide locally.
- the object of the present invention is the development of a method for the continuous production of impregnated paper honeycomb and the creation of corresponding impregnated paper honeycomb in which waterproof paper honeycomb can be produced in a continuous manufacturing process, which then possible due to the continuous impregnation and also after impregnation Deformability as not yet formed goods are present.
- the process should be cost-effective and process-technically feasible with little effort.
- Claim 7 describes a paper honeycomb material according to the method according to the invention, wherein the dependent claims describe 8 to 10 types of this material.
- the object is achieved according to the method by producing paper honeycomb material in a continuous expansion process in a first step.
- This continuously produced material is also continuously with a polyurethane resin solvent mixture soaked through by a solvent content of 10-35% greatly reduced viscosity, whereby the material is dissolved in its structure and completely penetrated by the impregnating agent.
- the result of this process is a continuously produced paper honeycomb material which is so completely impregnated that it can be cut into any packaging units when still undeformed and can be supplied as impregnated raw material for further use.
- the central advantage here is that in this way the actual shaping process of the impregnated paper honeycomb can be separated from the production or impregnation of these paper honeycomb.
- the high proportion of solvent causes in accordance with the invention defined amount of between 10 and 35% solvent content, which is set depending on the used paper honeycomb starting material, a structural solution of the paper honeycomb starting material and thus a complete transport of the dissolved Polyurethane resin in the paper honeycomb structure without this loses its structural integrity.
- the reduced stability due to the dissolution of the paper honeycomb by the polyurethane-solvent mixture is compensated for again during the hardening of the material by the solidification process.
- a one-component polyurethane resin is used in the impregnating agent. This has the particular advantage that no mixing ratios are to be taken into account during processing, whereby simpler and thus more cost effective methods are applicable.
- spraying of the impregnating agent is possible up to a honeycomb thickness of about 28 mm. From a honeycomb thickness of about 28 mm, the dipping process in the impregnating agent is to be preferred in order to ensure complete wetting and penetration of the honeycomb.
- the impregnated paper honeycomb in a heating or drying oven to to store.
- the residual solvents still present in the paper honeycomb are removed faster, and the paper honeycomb can be further processed faster, for example by the application of cover layers.
- the impregnating agent advantageously contains a proportion of about 20% to 30% of an organic solvent.
- This mixture realizes two demands on the impregnated paper honeycomb.
- a good transport of the polyurethane resin in ideal concentration so that the impregnation leads to an enclosure of the paper honeycomb and incorporation of the polyurethane resin in a thickness that gives the paper honeycomb the desired material properties.
- the polyurethane resin penetrates deep into the paper structure and thus makes the impregnation resistant to damage, whereby even later cutting of the paper honeycomb is possible upon receipt of the impregnation.
- this is achieved but with an overall thinner polyurethane resin layer, making the material easier and more flexible in processing, which meets the requirements of a paper honeycomb and this further delimited advantageous over, for example, plastic honeycomb.
- These paper honeycombs are characterized in their construction by a polyurethane resin coating, which extends into the paper structure of the paper honeycomb. This is not a sheath in the traditional sense, but a structural impregnation, but still can be made only on the already finished expanded paper honeycomb. This is particularly advantageous because it does not intervene in the production of the paper honeycomb itself, but the process can be done later on the paper honeycomb, which must actually have based on their application on such an impregnation.
- the paper structure of the paper honeycomb is expediently penetrated by polyurethane resin in such a way that the paper honeycomb is waterproof even on cut surfaces which are produced only after the impregnation.
- the paper honeycomb can be subjected in their manufactured large-scale initial shape of the impregnation, as a subsequent cutting is not a problem.
- this has a very beneficial effect, since so not a variety of blanks of the impregnation must be supplied, but can be done only from a previously impregnated paper honeycomb surface any number arbitrarily shaped blanks.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
- Laminated Bodies (AREA)
Description
Die Erfindung betrifft ein Verfahren zur kontinuierlichen Herstellung imprägnierter Papierwaben gemäß dem Oberbegriff des Patentanspruchs 1 sowie ein wasserfestes Papierwabenmaterial gemäß dem Oberbegriff des Patentanspruchs 7.The invention relates to a method for the continuous production of impregnated paper honeycombs according to the preamble of patent claim 1 and to a water-resistant paper honeycomb material according to the preamble of patent claim 7.
Die Papierwabe ist ein leichtes Kern- bzw. Füllmaterial mit in der Regel sechsseitiger Struktur, das hervorragende Festigkeitseigenschaften bei geringem Gewicht aufweist. Die Papierwaben sind als Kernmaterial für Sandwichkonstruktionen bei Möbeln, Türen und anderen Bauteilen bestens geeignet. Die Anwendungsmöglichkeiten von Waben sind demnach sehr vielseitig.The paper honeycomb is a lightweight core material, usually of a six-sided structure, which has excellent strength properties with low weight. The paper honeycombs are ideal as core material for sandwich constructions in furniture, doors and other components. The applications of honeycomb are therefore very versatile.
Allerdings sind Papierwaben in ihrem Einsatz momentan insofern eingeschränkt, dass diese beispielsweise keiner Feuchtigkeit ausgesetzt werden dürfen, da diese die strukturelle Festigkeit der Papierwaben reduziert und schließlich zerstört. Beschränkte Anwendungen erfolgen daher dort, wo Materialien mit Papierwabenkern der Witterung ausgesetzt sind oder Beeinträchtigungen durch Kondenswasser zu befürchten sind, beispielsweise bei Bauteilen im Fahrzeugbau.However, paper honeycombs are currently limited in their use in that they may not be exposed to moisture, for example, since this reduces the structural strength of the paper honeycombs and ultimately destroys them. Limited applications therefore take place where materials with a paper honeycomb core are exposed to the weather or where there is a risk of damage due to condensation, for example in components in vehicle construction.
In den zuvor genannten Bereichen wird momentan Wabenstrukturen aus Kunststoff oder Aluminium der Vorzug gegeben, um die Stabilität des Materials zu gewährleisten. Allerdings weisen diese Materialien den Nachteil auf kostenintensiv zu sein, weshalb der Einsatz von Papierwaben hier deutliche Einsparpotentiale sowie Gewichtsvorteile bietet. Gerade im Fahrzeugbau ist eine Reduzierung des Fahrzeuggewichts im Hinblick auf dessen Verbrauchseigenschaften ein intensiv verfolgtes konstruktionsziel.Honeycomb structures made of plastic or aluminum are currently being preferred in the areas mentioned above in order to ensure the stability of the material. Indeed These materials have the disadvantage of being expensive, which is why the use of paper honeycomb offers significant savings and weight advantages here. Especially in vehicle construction is a reduction of the vehicle weight in terms of its consumption characteristics an intensively pursued design goal.
Es ist daher anzustreben, die bekannten Papierwaben durch eine entsprechende Behandlung derart zu imprägnieren, dass diese auch in den zuvor als problematisch angesprochenen Bereichen eingesetzt werden können, in denen bislang Kunststoffen der Vorzug gegeben wird.It is therefore desirable to impregnate the known paper honeycomb by an appropriate treatment so that they can be used in the previously addressed as problematic areas in which hitherto plastics are given preference.
Die
In der
Nachteilig bei diesen Verfahren ist allerdings, dass es lediglich zur Bildung einer Imprägnierungsschicht um die Papierwabe kommt. Diese Imprägnierungshülle kann allerdings in der Praxis leicht beschädigt werden, wodurch beispielsweise durch feine Risse wiederum Kondenswasser oder andere Feuchtigkeit von außen in die Wabenstruktur eindringen und diese schwächen und letztlich zerstören kann.A disadvantage of these methods, however, is that it comes only to form an impregnation layer around the paper honeycomb. However, this impregnation can easily be damaged in practice, which in turn, for example, by fine cracks penetrate condensation or other moisture from the outside into the honeycomb structure and this can weaken and ultimately destroy.
Ein weiterer Nachteil dieser Verfahrens sowie der mit diesen Verfahren gewonnen Papierwaben ist, dass eine Anwendung ausschließlich bei bereits auf das benötigte Format zugeschnittenen Papierwabenflächen erfolgen kann. Ein nachträgliches Schneiden einer bereits derart imprägnierten Papierwabe führt immer zu einer Zerstörung der Imprägnierung an den Schnittflächen, wodurch wiederum Feuchtigkeit eindringen kann mit den bereits beschriebenen negativen Auswirkungen.Another disadvantage of this method and the Paper honeycombs obtained with these methods is that an application can only be made with paper honeycomb surfaces already cut to the required format. Subsequent cutting of a previously impregnated paper honeycomb always leads to a destruction of the impregnation of the cut surfaces, which in turn can penetrate moisture with the negative effects already described.
Die
Desweiteren offenbart die Schrift
Aus der Offenlegungsschrift
Nach diesem Imprägnierungsvorgang wird das Trägermaterial einer thermischen Behandlung in einem Bereich zwischen 120 und 190 Grad Celsius ausgesetzt, wodurch die Polymerisation in einem Zeitraum von etwa 40 Sekunden bis 3 Minuten erfolgt. In diesem Zeitfenster der Polymerisation ist das Trägermaterial und der sich im Trägermaterial bildende Polyharnstoff verformbar beispielsweise in beheizten Formgebungswerkzeugen, weshalb in diesem Verfahren noch während der Polymerisation der Formgebungsprozess des Verstärkungsmateriales erfolgt.After this impregnation process, the support material is subjected to a thermal treatment in a range between 120 and 190 degrees Celsius, whereby the polymerization takes place in a period of about 40 seconds to 3 minutes. In this time window of the polymerization, the carrier material and the polyurea forming in the carrier material are deformable, for example in heated shaping tools, which is why in this process during the polymerization the shaping process of the reinforcing material takes place.
Nachteilig ist hierbei, dass die Imprägnierung des Trägermaterials in zeitlichen enger Kombination mit der Formgebung für eine Verwendung beispielsweise zur Verklebung mit einem formgleichen Karosserieblech erfolgen muss. Nach Abschluss der Polymerisation wäre eine entsprechende Formgebung nicht mehr möglich. Dies bedeutet, dass die Imprägnierung des Trägermaterials und die Formgebung auch örtlich zusammenfallen müssen.The disadvantage here is that the impregnation of the carrier material must be done in close temporal combination with the shaping for use, for example, for bonding with a matching body panel. After completion of the polymerization, a corresponding shaping would no longer be possible. This means that the impregnation of the substrate and the shaping must also coincide locally.
Vor diesem Hintergrund ist die Aufgabe der vorliegenden Erfindung die Entwicklung eines Verfahrens zur kontinuierlichen Herstellung imprägnierter Papierwaben sowie die Schaffung entsprechender imprägnierter Papierwaben, bei dem in einem kontinuierlichen Herstellungsprozess wasserfeste Papierwaben produziert werden können, die dann aufgrund der durchgängigen Imprägnierung und der auch nach der Imprägnierung möglich Verformbarkeit als noch nicht geformte Ware vorliegen. Das Verfahren soll gleichzeitig kostengünstig und verfahrenstechnisch mit geringem Aufwand realisierbar sein.Against this background, the object of the present invention is the development of a method for the continuous production of impregnated paper honeycomb and the creation of corresponding impregnated paper honeycomb in which waterproof paper honeycomb can be produced in a continuous manufacturing process, which then possible due to the continuous impregnation and also after impregnation Deformability as not yet formed goods are present. At the same time, the process should be cost-effective and process-technically feasible with little effort.
Erreicht wird dies nach der Erfindung durch ein Verfahren zur kontinuierlichen Herstellung imprägnierter Papierwaben nach Anspruch 1. Die Unteransprüche 2 bis 6 haben vorteilhafte Ausführungen dieses Verfahrens zum Gegenstand.This is achieved according to the invention by a method for the continuous production of impregnated paper honeycomb according to claim 1. The dependent claims 2 to 6 have advantageous embodiments of this method to the subject.
Anspruch 7 beschreibt ein Papierwabenmaterial entsprechend dem erfindungsgemäßen Verfahren, wobei die Unteransprüche 8 bis 10 Bauformen dieses Materials beschreiben.Claim 7 describes a paper honeycomb material according to the method according to the invention, wherein the dependent claims describe 8 to 10 types of this material.
Die Aufgabe wird verfahrensgemäß gelöst, indem in einem ersten Schritt Papierwabenmaterial in einem kontinuierlichen Expansionsprozess produziert wird. Dieses kontinuierlich produzierte Material wird ebenfalls kontinuierlich mit einer Polyurethanharz-Lösungsmittel-Mischung mit durch einen Lösungsmittelanteil von 10-35% stark verringerter Viskosität durchtränkt, wodurch das Material in seiner Struktur angelöst und vollständig vom Imprägniermittel durchdrungen wird.The object is achieved according to the method by producing paper honeycomb material in a continuous expansion process in a first step. This continuously produced material is also continuously with a polyurethane resin solvent mixture soaked through by a solvent content of 10-35% greatly reduced viscosity, whereby the material is dissolved in its structure and completely penetrated by the impregnating agent.
Es kommt dann in einem weiteren Verfahrenschritt zur Reaktion des Polyurethanharzes und der in der Papierwabe vorhandenen Feuchtigkeit und abschließend zum Aushärtungsvorgang der imprägnierten Papierwabe unter Verflüchtigung der enthaltenen Lösungsmittelanteile.It then comes in a further process step for the reaction of the polyurethane resin and the moisture present in the paper honeycomb and finally to the curing process of the impregnated paper honeycomb with volatilization of the solvent contained.
Ergebnis dieses Verfahrens ist ein kontinuierlich produziertes Papierwabenmaterial, welches derart vollständig imprägniert ist, dass es im noch unverformten Zustand in beliebige Verpackungseinheiten zugeschnitten werden kann und als imprägniertes Rohmaterial einer weiteren Verwendung zugeführt werden kann. Der zentrale Vorteil hierbei ist, dass auf diese Weise der eigentliche Formgebungsprozess der imprägnierten Papierwaben von der Herstellung respektive Imprägnierung dieser Papierwaben getrennt werden kann.The result of this process is a continuously produced paper honeycomb material which is so completely impregnated that it can be cut into any packaging units when still undeformed and can be supplied as impregnated raw material for further use. The central advantage here is that in this way the actual shaping process of the impregnated paper honeycomb can be separated from the production or impregnation of these paper honeycomb.
Das heisst, es ist auf diese Weise möglich, imprägnierte Papierwaben als Ausgangsmaterial für weitere Herstellungsprozesse zur Verfügung zu stellen und somit den Verbraucher dieses Papierwabenmaterials lediglich mit der abschließenden Formgebung des Produktes zu belasten, da die Produktion des Materials selbst sowie die Imprägnierung als Vorleistung erbracht worden ist. Für den Verwender des Ausgangmaterials der Papierwaben entfällt somit eine aufwendige Imprägnierung als Verfahrensschritt seiner eigenen Herstellung.That is, it is possible in this way to provide impregnated paper honeycomb as a starting material for further manufacturing processes and thus to burden the consumer of this paper honeycomb material only with the final shaping of the product, since the production of the material itself and the impregnation has been provided as an input is. For the user of the starting material of the paper honeycomb thus eliminates a complex impregnation as a process step of its own production.
Möglich wird dies insbesondere durch die spezielle Wirkung der Kombination aus einen hohem Lösungsmittelanteil und dem die Imprägnierung bewirkenden Polyurethanharz. Der hohe Lösungsmittelanteil bewirkt beim erfindungsgemäß definierten Mengenanteil zwischen 10 und 35 % Lösungsmittelanteil, welcher je nach verwendetem Papierwabenausgangsmaterial einzustellen ist, eine strukturelle Anlösung des Papierwabenausgangsmaterial und somit einen vollständigen Transport des gelösten Polyurethanharzes in die Papierwabenstruktur ohne dass diese ihre strukturelle Integrität verliert. Die herabgesetzte Stabilität durch das Anlösen der Papierwabe durch die Polyurethan-Lösungsmittel-Mischung wird beim Aushärten des Materials durch den Verfestigungsvorgang wieder kompensiert.This is made possible, in particular, by the special action of the combination of a high proportion of solvent and the impregnation-causing polyurethane resin. The high proportion of solvent causes in accordance with the invention defined amount of between 10 and 35% solvent content, which is set depending on the used paper honeycomb starting material, a structural solution of the paper honeycomb starting material and thus a complete transport of the dissolved Polyurethane resin in the paper honeycomb structure without this loses its structural integrity. The reduced stability due to the dissolution of the paper honeycomb by the polyurethane-solvent mixture is compensated for again during the hardening of the material by the solidification process.
Diese höhere Durchdringung des Papierwabenmaterials mit dem die Imprägnierung bewirkenden Polyurethanharz wird zudem dadurch erreicht, dass das in der Mischung enthaltene Lösungsmittel die Papierstruktur anlöst und somit saugfähiger macht, gleichzeitig aber auch die Viskosität des Polyurethanharzes herabsetzt. Durch diesen Doppeleffekt wird das fließfähigere Polyurethanharz aufgrund der Kapillarwirkung innerhalb der Mikrofaserstruktur des Papiers in diese Struktur hineingesaugt und dringt daher tief ins Papier ein. Es handelt sich somit um eine Imprägnierung auf deutlich höherem Niveau als die bekannten Oberflächenbehandlungen von Papierwaben im Stand der Technik.This higher penetration of the paper honeycomb material with the polyurethane resin causing the impregnation is additionally achieved by the fact that the solvent contained in the mixture dissolves the paper structure and thus makes it more absorbent, but at the same time also reduces the viscosity of the polyurethane resin. Due to this double effect, the flowable polyurethane resin is sucked into this structure due to the capillary action within the microfiber structure of the paper and therefore penetrates deeply into the paper. It is therefore an impregnation at a significantly higher level than the known surface treatments of paper honeycomb in the prior art.
Um ein vorteilhaftes Verfahren anzustreben wird im Imprägniermittel ein Ein-Komponenten-Polyurethanharz verwendet. Dieses hat insbesondere den Vorteil, dass keine Mischungsverhältnisse bei der Verarbeitung zu berücksichtigen sind, wodurch einfachere und somit auch kostengünstigere Verfahren anwendbar sind.In order to pursue an advantageous process, a one-component polyurethane resin is used in the impregnating agent. This has the particular advantage that no mixing ratios are to be taken into account during processing, whereby simpler and thus more cost effective methods are applicable.
Als Behandlungsverfahren der Papierwabe mit Imprägniermittel ist bis zu einer Wabenstärke von ca. 28 mm das Aufsprühen des Imprägniermittels möglich. Ab einer Wabenstärke über ca. 28 mm ist dem Tauchverfahren im Imprägniermittel der Vorzug zu geben, um eine vollständige Benetzung und Durchdringung der Waben sicher zu gewährleisten.As a method of treatment of the paper honeycomb with impregnating agent, spraying of the impregnating agent is possible up to a honeycomb thickness of about 28 mm. From a honeycomb thickness of about 28 mm, the dipping process in the impregnating agent is to be preferred in order to ensure complete wetting and penetration of the honeycomb.
Zur Beschleunigung der Aushärtung ist zweckmäßigerweise als abschließender Verfahrensschritt vorgesehen, die imprägnierten Papierwaben in einem Wärme- bzw. Trockenschrank zu lagern. Auf diese Weise werden außerdem die noch in der Papierwabe vorhandenen Lösungsmittelreste schneller entfernt, und die Papierwabe kann schneller weiterverarbeitet werden, beispielsweise durch das Aufbringen von Deckschichten.To accelerate the curing is expediently provided as a final process step, the impregnated paper honeycomb in a heating or drying oven to to store. In this way, moreover, the residual solvents still present in the paper honeycomb are removed faster, and the paper honeycomb can be further processed faster, for example by the application of cover layers.
Das Imprägniermittel enthält vorteilhafterweise einen Anteil von etwa 20% bis 30% eines organischen Lösungsmittels. Diese Mischung verwirklicht zwei Ansprüche an die imprägnierte Papierwabe. Zum einen die gute Durchdringung der Papierwabe aufgrund des Lösungsmittelanteils, der zum einen die Mischung fließfähiger macht und zum anderen die Anlösung der Papierwabe derart bewirkt, dass diese saugfähiger wird. Zum anderen einen guten Transport des Polyurethanharzes in idealer Konzentration, so dass die Imprägnierung zu einer Umschließung der Papierwabe und Einlagerung des Polyurethanharzes in einer Stärke führt, die der Papierwabe die gewünschten Materialeigenschaften erhält.The impregnating agent advantageously contains a proportion of about 20% to 30% of an organic solvent. This mixture realizes two demands on the impregnated paper honeycomb. On the one hand the good penetration of the paper honeycomb due to the solvent content, which makes the mixture flowable on the one hand, and on the other hand causes the dissolution of the paper honeycomb in such a way that it becomes more absorbent. On the other hand, a good transport of the polyurethane resin in ideal concentration, so that the impregnation leads to an enclosure of the paper honeycomb and incorporation of the polyurethane resin in a thickness that gives the paper honeycomb the desired material properties.
Bei einem zu geringen Lösungsmittelanteil wird das Papier schlechter durchdrungen. Eine Benetzung der Inneren Papierstruktur ist dadurch nicht mehr gewährleistet. Negativ ist dadurch, dass die Wabe wieder anfälliger für eine Feuchtigkeitsaufnahme ist.If the solvent content is too low, the paper will be less penetrated. Wetting of the inner paper structure is no longer guaranteed. Negative is that the honeycomb is again more susceptible to moisture absorption.
Bei einer idealen Lösungsmittelkonzentration gelangt zum einen das Polyurethanharz tief in die Papierstruktur und macht die Imprägnierung dadurch resistent gegen Beschädigungen, wodurch selbst ein späterer Zuschnitt der Papierwabe möglich ist bei Erhalt der Imprägnierung. Zum anderen wird dies aber erreicht bei einer insgesamt dünneren Polyurethanharz-Schicht, wodurch das Material leichter und in der Verarbeitung elastischer bleibt, was den Anforderungen an eine Papierwabe entspricht und diese weiterhin vorteilhaft abgrenzt gegenüber beispielsweise Kunststoffwaben.At an ideal solvent concentration, on the one hand, the polyurethane resin penetrates deep into the paper structure and thus makes the impregnation resistant to damage, whereby even later cutting of the paper honeycomb is possible upon receipt of the impregnation. On the other hand, this is achieved but with an overall thinner polyurethane resin layer, making the material easier and more flexible in processing, which meets the requirements of a paper honeycomb and this further delimited advantageous over, for example, plastic honeycomb.
Ein zu hoher Lösungsmittelanteil schließlich führt zu einem zu geringen Transport an verdünntem Polyurethanharz. Dieses dringt zwar gut in die Papierstruktur ein, vermag aber nicht zur gewünschten Imprägnierung zu führen, da die Schichtstärke zu gering ist. Zudem kann es zu einer zu starken Anlösung der Papierwabenstruktur kommen.Too high a proportion of solvent eventually results in too little transport of dilute polyurethane resin. Although this penetrates well into the paper structure, but can not lead to the desired impregnation, since the layer thickness is too low. In addition, too much dissolution of the paper honeycomb structure can occur.
Es werden ebenfalls die mit einer Imprägnierung auf Polyurethanharzbasis versehenen Papierwaben beansprucht, die gemäß dem Verfahren nach einem der vorangegangenen Ansprüche erzeugt wurden.Also claimed are the polyurethane honeycomb impregnated paper honeycombs produced according to the method of any one of the preceding claims.
Diese Papierwaben zeichnen sich in ihrem Aufbau aus durch eine Polyurethanharz-Beschichtung, die in die Papierstruktur der Papierwabe hineinreicht. Hierdurch handelt es sich nicht um eine Ummantelung im herkömmlichen Sinne, sondern um eine strukturelle Imprägnierung, die dennoch erst an der bereits fertigen expandierten Papierwabe vorgenommen werden kann. Dies ist insbesondere vorteilhaft, da so nicht in die Produktion der Papierwabe an sich einzugreifen ist, sondern das Verfahren nachträglich an den Papierwaben erfolgen kann, die tatsächlich bezogen auf Ihren Anwendungsbereich über eine derartige Imprägnierung verfügen müssen.These paper honeycombs are characterized in their construction by a polyurethane resin coating, which extends into the paper structure of the paper honeycomb. This is not a sheath in the traditional sense, but a structural impregnation, but still can be made only on the already finished expanded paper honeycomb. This is particularly advantageous because it does not intervene in the production of the paper honeycomb itself, but the process can be done later on the paper honeycomb, which must actually have based on their application on such an impregnation.
Die Papierstruktur der Papierwabe ist hierbei zweckmäßigerweise derart von Polyurethanharz durchdrungen, dass die Papierwabe auch an Schnittflächen wasserfest ist, die erst nach der Imprägnierung erzeugt werden. Auf diese Weise kann die Papierwabe in ihrer gefertigten großflächigen Ausgangsform der Imprägnierung unterzogen werden, da ein nachträgliches Zuschneiden unproblematisch ist. In der Praxis wirkt sich dies sehr vorteilhaft aus, da so nicht eine Vielzahl von Zuschnitten der Imprägnierung zugeführt werden müssen, sondern lediglich aus einer zuvor imprägnierten Papierwabenfläche eine beliebige Zahl beliebig geformter Zuschnitte erfolgen kann.The paper structure of the paper honeycomb is expediently penetrated by polyurethane resin in such a way that the paper honeycomb is waterproof even on cut surfaces which are produced only after the impregnation. In this way, the paper honeycomb can be subjected in their manufactured large-scale initial shape of the impregnation, as a subsequent cutting is not a problem. In practice, this has a very beneficial effect, since so not a variety of blanks of the impregnation must be supplied, but can be done only from a previously impregnated paper honeycomb surface any number arbitrarily shaped blanks.
Schließlich weisen sich die nach dem Verfahren hergestellten Papierwaben durch eine erhöhte Festigkeit aus, die durch die strukturelle Einlagerung des Polyurethanharzes bedingt ist.Finally, the paper honeycomb produced by the process by an increased strength, which is due to the structural incorporation of the polyurethane resin.
Claims (10)
- Procedure for the continuous production of impregnated honeycombed paper as core material using polyurethane resin, whereby the steps of the procedure encompass as a minimum:(a) continuous manufacture of expanded honeycombed paper material,(b) continuous treatment of the expanded honeycombed paper material with an impregnation agent containing a polyurethane resin solution mixture which has a reduced viscosity through a proportion of ca. 10% - 35% solvent.(c) partial dissolution and complete permeation of the paper honeycomb with the impregnation agent(d) reaction of the polyurethane resin with the moisture inherent in the paper honeycomb as well as(e) evaporation of the solvent content and hardening of the impregnated paper honeycomb.
- Procedure for impregnating the paper honeycombs as in Claim 1, characterized in that
a single component polyurethane resin is used in the impregnation agent. - Procedure for impregnating paper honeycombs as in Claim 1 or Claim 2,
characterized in that
the treatment of the paper honeycomb with the impregnation agent up to thickness of ca. 28 mm is effected by spraying the impregnation agent. - Procedure for impregnating paper honeycombs in accordance with one of the aforementioned claims,
characterized in that
the treatment of the paper honeycomb with the impregnation agent from a thickness of ca. 28 mm upwards is effected by dip coating in the impregnation agent. - Procedure for impregnating paper honeycombs in accordance with one of the aforementioned claims,
characterized in that
as closing step in the process the storage of the impregnated paper honeycomb is to be undertaken in a heating or drying cupboard in order to accelerate the hardening - Procedure for impregnating paper honeycombs in accordance with one of the aforementioned claims,
characterized in that
the impregnation agent contains a share of about 20% to 30% of an organic solvent. - Treating paper honeycombs with impregnation on a polyurethane resin basis, which was created in accordance with the procedure according to one of the foregoing claims
- Paper honeycombs in accordance with Claim 7,
characterized in that
the polyurethane resin forms a coating which reaches into the paper structure of the paper honeycomb. - Paper honeycombs in accordance with Claim 7 or 8,
characterized in that
The paper structure of the paper honeycomb is permeated by the polyurethane to such extent that the paper honeycomb is also waterproof on the cut surfaces which are first created after the impregnation. - Paper honeycombs in accordance with Claims 7 to 8,
characterized in that
the stability of the paper honeycomb is increased by the impregnation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL09013677T PL2186940T3 (en) | 2008-11-14 | 2009-10-30 | Method for continuous production of impregnated paper honeycomb |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008057481 | 2008-11-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2186940A1 EP2186940A1 (en) | 2010-05-19 |
| EP2186940B1 true EP2186940B1 (en) | 2012-12-19 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09013677A Not-in-force EP2186940B1 (en) | 2008-11-14 | 2009-10-30 | Method for continuous production of impregnated paper honeycomb |
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| EP (1) | EP2186940B1 (en) |
| PL (1) | PL2186940T3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113290944A (en) * | 2021-05-31 | 2021-08-24 | 芜湖创联新材料科技有限公司 | Method for manufacturing aramid paper honeycomb with uniform density |
| CN114069251B (en) * | 2021-12-16 | 2022-12-09 | 南京大学 | Oriented honeycomb wave-absorbing material and preparation method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2568513B1 (en) * | 1984-07-31 | 1986-11-14 | Hexagone | DRAWING-CALIBRATION PROCESS OF PAPER BAND WITH ALVEOLAR NETWORK AND MACHINE FOR IMPLEMENTING SAME |
| NL1000088C2 (en) | 1995-04-07 | 1996-10-08 | Besin Bv | Method for rendering expanded paper honeycomb core material, and honeycomb core material obtained therewith, moisture- or water-resistant. |
| DE19630408A1 (en) | 1996-07-26 | 1998-01-29 | Emfisint Automotive S A | Reinforcing material, process for its manufacture and use thereof |
| DE20201922U1 (en) | 2002-02-08 | 2003-03-20 | Schmitt Brigitte | Lightweight sandwich structure panel has a paper cellular inner structure covered on both sides by aluminium of glass fibre reinforced plastic |
| DE102004059103A1 (en) | 2004-12-28 | 2006-07-13 | Cohopa Gmbh | Flat sandwich material is formed by measuring the size of the lower cover, applying a plastic foam layer, applying a top cover, and connecting the cover to the contact surface |
| DE102006016943A1 (en) | 2006-04-11 | 2007-10-25 | Gundelsheimer, Hildegard | Optimization of paper quality for application in loaded element by coating/impregnating a chemical e.g. polyurethane/polyester synthetic material, where the fiber structure of the paper is strengthened and solidified |
-
2009
- 2009-10-30 EP EP09013677A patent/EP2186940B1/en not_active Not-in-force
- 2009-10-30 PL PL09013677T patent/PL2186940T3/en unknown
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| Publication number | Publication date |
|---|---|
| PL2186940T3 (en) | 2013-05-31 |
| EP2186940A1 (en) | 2010-05-19 |
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