DE19861467B4 - Process for producing a film composite - Google Patents
Process for producing a film composite Download PDFInfo
- Publication number
- DE19861467B4 DE19861467B4 DE19861467.5A DE19861467A DE19861467B4 DE 19861467 B4 DE19861467 B4 DE 19861467B4 DE 19861467 A DE19861467 A DE 19861467A DE 19861467 B4 DE19861467 B4 DE 19861467B4
- Authority
- DE
- Germany
- Prior art keywords
- pressure
- fibrous web
- web
- pulp
- film
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002131 composite material Substances 0.000 title claims abstract description 11
- 239000000835 fiber Substances 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 21
- 230000004927 fusion Effects 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000004753 textile Substances 0.000 claims abstract description 7
- 230000002745 absorbent Effects 0.000 claims abstract description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- -1 polyethylene Polymers 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims 1
- 239000002985 plastic film Substances 0.000 claims 1
- 229920006255 plastic film Polymers 0.000 claims 1
- 238000007639 printing Methods 0.000 abstract description 2
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- 230000000694 effects Effects 0.000 description 1
- ZINJLDJMHCUBIP-UHFFFAOYSA-N ethametsulfuron-methyl Chemical compound CCOC1=NC(NC)=NC(NC(=O)NS(=O)(=O)C=2C(=CC=CC=2)C(=O)OC)=N1 ZINJLDJMHCUBIP-UHFFFAOYSA-N 0.000 description 1
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Images
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Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
Verfahren zur Herstellung eines Folienverbundes, wobei zunächst eine aus Zellstoff-Fasern bestehende, weitgehend reißfeste, saugfähige und rollbare Faserstoffbahn (100) mit folgenden Verfahrensschritten hergestellt wird: a) Legen einer regellosen Zellstoff-Faserlage auf eine Unterlage (Siebband B) und Vorverdichten unter relativ niedrigem Druck und Erzeugen eines lockeren Vlieses mit geringer Dichte und Reißfestigkeit, b) Einführen des lockeren Vlieses in den Spalt eines (weiteren) Kalanderrollen-Paares (6.1, 6.2), mit dem ein Muster von punkt- oder linienförmigen Druckbereichen (17) erzeugt wird, in denen die regellos liegenden Fasern (1) unter einem Druck im Bereich 100 MPa bis 600 MPa aufeinander gedrückt werden, so daß eine innige, sich nach Aufheben des Druckes nicht-lösende Fusion der Faserkörper ohne Beifügung weiterer Bindemittel in Form einer Faserstoffbahn (100) mit einem Prägemuster erzeugt wird, c) und dass nach dem Durchlauf durch das Hochdruck-Kalanderpaar (6.1, 6.2) wenigstens eine Seite der Faserstoffbahn (100) mit einer Bahn (20.1, 20.2) aus textilem, vliesartigem oder folienartigem Material verklebt und/oder verschweißt wird.A process for the production of a film composite, wherein initially made of pulp fibers, largely tear-resistant, absorbent and rollable fibrous web (100) is produced with the following process steps: a) laying a random pulp fiber layer on a substrate (wire B) and pre-compression under relative b) inserting the loose web into the nip of a (further) pair of calender rolls (6.1, 6.2) producing a pattern of dot or line printing areas (17) in which the random fibers (1) are pressed together under a pressure in the range from 100 MPa to 600 MPa, so that an intimate fusion of the fiber bodies that does not dissolve after the pressure has been released without the addition of further binders in the form of a fibrous web (100 ) is produced with an embossed pattern, c) and that after passing through the high-pressure calender pair (6. 1, 6.2), at least one side of the fibrous web (100) is glued and / or welded to a web (20.1, 20.2) of textile, fleece-like or film-like material.
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines Folienverbundes unter Verwendung einer aus Zellstoff-Fasern bestehenden, weitgehend reißfesten, saugfähigen und rollbaren Faserstoffbahn.The invention relates to a method for producing a film composite using a pulp fibers, largely tear-resistant, absorbent and rollable fibrous web.
Regellos liegende Fasern, die unter sehr hohem lokalen Druck in linien- oder punktörmigen Druckbereichen aufeinander gedrückt werden, so daß eine Vielzahl von innigen, sich nach Aufhebung des Druckes nicht-lösenden Fusionen der Faserkörper erfolgt, werden in einer nicht vorveröffentlichen Schrift
Es ist besonders vorteilhaft, dass die Fusion allein durch Druckbeaufschlagung bewirkt wird, so daß das Produkt bei hoher Reißfestigkeit keine Substanzen wie Bindemittel oder Klebstoffe enthält, die die Haut- und/oder Umweltverträglichkeit beeinträchtigen können. Die Herstellung erfolgt bei Zimmertemperaturen und unter normalem Atmosphärendruck und Sauerstoffgehalt der Umgebungsluft.It is particularly advantageous that the fusion is effected solely by pressurization, so that the product contains at high tensile strength no substances such as binders or adhesives, which may affect the skin and / or environmental compatibility. The preparation takes place at room temperatures and under normal atmospheric pressure and oxygen content of the ambient air.
Es hat sich allerdings gezeigt, daß in bestimmten Anwendungsfällen das mit dem bekannten Verfahren hergestellte Fasermaterial nicht alle spezifischen Anforderungen, z. B. des Hygiene- oder Bausektors erfüllt, so daß das Fasermaterial in arbeitsintensiver Weise nachträglich mit geeigneten Materialien kombiniert werden muß.However, it has been shown that in certain applications, the fiber material produced by the known method not all specific requirements, eg. As the hygiene or construction sector, so that the fiber material must be subsequently combined in a labor-intensive manner with suitable materials.
Es stellt sich demnach die Aufgabe, ein Verfahren zur Herstellung einer aus Zellstoff-Fasern bestehenden Faserstoffbahn anzugeben, das mit zusätzlichen Merkmalen wie beispielsweise verstärkter Reißfestigkeit, Dichtigkeit oder Atmungs- und/oder Isoliereigenschaften ausgestattet ist.It is therefore the object to provide a method for producing a fibrous web consisting of pulp fibers, which is equipped with additional features such as increased tear strength, tightness or respiratory and / or insulating properties.
Diese Aufgabe wird gelöst bei einem Verfahren zur Herstellung eines Folienverbundes, wobei zunächst eine aus Zellstoff-Fasern bestehende, weitgehend reißfeste, saugfähige und rollbare Faserstoffbahn mit folgenden Verfahrensschritten hergestellt wird:
- a) Legen einer regellosen Zellstoff-Faserlage auf eine Unterlage (Siebband) und Vorverdichten unter relativ niedrigem Druck und Erzeugen eines lockeren Vlieses mit geringer Dichte und Reißfestigkeit,
- b) Einführen des lockeren Vlieses in den Spalt eines (weiteren) Kalanderrollen-Paares, mit dem ein Muster von punkt- oder linienförmigen Druckbereichen erzeugt wird, in denen die regellos liegenden Fasern unter einem Druck
im Bereich von 100 MPa bis 600 MPa aufeinander gedrückt werden, so dass eine innige, sich nach Aufheben des Druckes nicht-lösende Fusion der Faserkörper ohne Beifügung weiterer Bindemittel in Form einer Faserstoffbahn mit einem Prägemuster erzeugt wird, - c) wobei nach dem Durchlauf durch das Hochdruck-Kalanderpaar wenigstens eine Seite der Faserstoffbahn mit einer Bahn aus textilem, vliesartigem oder folienartigem Material verklebt und/oder verschweißt wird.
- a) laying a random pulp fiber layer on a support (screen belt) and precompressing under relatively low pressure and producing a loose fleece with low density and tear strength,
- b) inserting the loose web into the nip of a (further) pair of calender rolls to create a pattern of dot or line printing areas in which the random fibers are pressed together under pressure ranging from 100 MPa to 600 MPa in such a way that an intimate fusion of the fiber bodies, which does not dissolve after the pressure has been released, is produced without the addition of further binders in the form of a fibrous web with an embossed pattern,
- c) wherein after passing through the high-pressure calender pair, at least one side of the fibrous web is bonded and / or welded to a web of textile, fleece-like or film-like material.
Durch dieses Verfahren ist es möglich, die günstigen Eigenschaften bekannter bahnförmiger Zusatzstoffe mit denen der gemäß Patentanmeldung
Die Erfindung wird nachfolgend anhand eines Ausführungsbeispieles und der Zeichnung beschrieben.The invention will be described below with reference to an embodiment and the drawing.
Die Figur der Zeichnung zeigt in schematischer Darstellung eine Vorrichtung zur Herstellung eines Folienverbundes.The figure of the drawing shows a schematic representation of an apparatus for producing a composite film.
In der Figur ist in schematischer Reihenfolge eine Anordnung von Walzen und Rollen dargestellt, mit denen das Verfahren durchgeführt wird. Der Herstellungsprozeß geht aus von Zellstoff-Fasern, die als fluff pulp aus trockenem ”wood pulp” mit Hilfe von Hammermühlen hergestellt werden.In the figure, an arrangement of rollers and rollers is shown in a schematic order, with which the method is carried out. The manufacturing process is based on pulp fibers, which are produced as fluff pulp from dry "wood pulp" using hammer mills.
Eine Schicht aus regellosen Fasern
Zwischen den Kalanderwalzen
Zwischen den Kalanderrollen
Dabei wird vermieden, dass das Fasermaterial verkohlt oder karbonisiert. Offensichtlich ist der Druck aber so hoch angesetzt, daß quasi ein Verschmelzen der die Faser ausmachenden Stoffe, das heißt Cellulose und ein Rest an Lignin, und der anderen Stoffen eintritt, wobei eine so innige Verbundenheit eintritt, daß praktisch eine über eine reine Adhäsion hinausgehende Verbindung erzeugt wird.This avoids that the fiber material charred or carbonized. Obviously, however, the pressure is set so high that a quasi merging of the fibers constituting substances, ie cellulose and a residue of lignin, and the other substances occurs, with such intimate connection occurs that practically beyond a mere adhesion compound is produced.
Die Rollen
Es lassen sich beispielsweise mit dem Verfahren Faserstoffbahnen mit einem m2-Gewicht zwischen 50 und 900 g erzeugen. Die aus den Kalandern heraustretende Faserstoffbahn
Nach Durchlauf der Kalanderwalzen
Das zum Einsatz gelangende Material sollte in erster Linie ein in großer Menge zur Verfügung stehendes, preiswertes Massenmaterial sein. Vorzugsweise wird ein fluff pulp gewählt, das eine Weißheit von 85 bis 89% besitzt, was wiederum bedeutet, daß ein Lignin- und Reststoff-Gehalt von erheblichem Ausmaß noch vorhanden ist. Es hat sich gezeigt, daß derartige Reststoffe das Bindungsverhalten wesentlich verbessern. Völlig ausgebleichte Zellstoffe haben erfahrungsgemäß ein schlechteres Bindeverhalten als die vorgenannten weniger reinen Zellstoffe. Der Titer sollte auch eine gewisse Länge nicht unterschreiten, da bei allzu kurzen Fasern die Abstände zwischen den punktförmigen Druckbereichen nicht überbrückt werden, so daß sich bei derartigen geringen Titern eine geringere Reißfestigkeit ergibt.The material used should primarily be a bulk, inexpensive mass material. Preferably, a fluff pulp is chosen which has a whiteness of 85 to 89%, which in turn means that a significant amount of lignin and residual material is still present. It has been shown that such residues significantly improve the bonding behavior. Completely bleached pulps have, according to experience, a worse binding behavior than the aforementioned less pure pulps. The titer should not be less than a certain length, because too short fibers, the distances between the dot-shaped pressure ranges are not bridged, so that there is a lower tear strength at such low titers.
Zugefügte Hilfsstoffe werden ebenfalls nach der erwünschten Reißfestigkeit bemessen. Relativ unkritisch ist die Hinzufügung von sogenannten Superabsorbern, wie sie beispielsweise in der Schrift
Das Hinzufügen von gemahlenen anorganischen Stoffen, wie dem Weißpigment Titandioxid, verringert allerdings die Reißfestigkeit, so daß z. B. ein Prozentsatz von 25 Gew.-% Titandioxid im Allgemeinen nicht überschritten werden sollte Wesentlich ist, daß auf Bindemittel, wie sie aus dem Stand der Technik bekannt sind und im Allgemeinen auch gefordert werden, praktisch völlig verzichtet werden kann. Hierdurch werden die Recyclingfähigkeit und die Kompostierbarkeit des Produktes wesentlich verbessert. Die Herstellung wird verbillig und erleichtert, da Stationen zum Aufbringen und Abbinden (curing) überhaupt nicht eingesetzt werden müssen.However, the addition of milled inorganic materials, such as the white pigment titanium dioxide, reduces the tear strength, so that z. In general, it should be noted that it is virtually impossible to use binders which are known from the prior art and are generally required. This significantly improves the recyclability and compostability of the product. The production is cheaper and cheaper, since stations for applying and curing (curing) need not be used at all.
Die Walzen sind auf ihrem Walzenmantel mit Noppen versehen. Die zahlreichen, über die Walzenmantelfläche verteilten Noppen ergeben bei der fertigen Faserstoffbahn vorzugsweise eine Rasterdichte der punktförmigen Druckbereiche zwischen 1 und 16 pro cm2. Die Noppen haben eine Pyramidenstumpf-Form, wobei der Winkel des Noppenmantels gegenüber dem Radius zwischen 10° und 45° liegen sollte. Im Spalt zwischen den Walzen, in dem der Druckbereich erzeugt wird, herrscht ein berechneter Druck von etwa 520 MPa, der zu der bereits beschriebenen Fusion der sich im Spalt befindlichen Zellstoff-Fasern führt. Auch andere Formen der Druckbereiche, wie Kegelstümpfe, Zylinder oder Quader, sind möglich und werden nach fachmännischem Ermessen entsprechend dem erforderlichen Druck, dem vorliegenden Ausgangsstoff und dem Material der Walzen, den auftretenden Temperaturen und dgl. gewählt.The rollers are provided with nubs on their roller shell. The numerous nubs distributed over the roll surface area preferably produce a grid density of the dot-shaped pressure ranges between 1 and 16 per cm 2 in the finished fibrous web. The nubs have a truncated pyramid shape, wherein the angle of the nubbed shell should be compared to the radius between 10 ° and 45 °. There is a calculated pressure of about 520 MPa in the nip between the rolls in which the pressure area is created, resulting in the already described fusion of the nested pulp fibers. Other forms of pressure ranges, such as truncated cones, cylinders or cuboids, are possible and are chosen according to the professional judgment of the required pressure, the present source material and the material of the rollers, the temperatures occurring and the like.
Das fertige Produkt weist fast durchsichtige Fusionsbereiche auf, die sich jeweils mit etwas aufgebauschten, jedoch auch gegenüber dem Eingangsvlies zusammengepreßten lockeren Bereichen abwechseln.The finished product has almost transparent fusion areas, each alternating with slightly bulging, but also with respect to the input fleece compressed loose areas alternate.
Die Beschichtungsverfahren werden anhand der nachfolgenden Beispiele näher beschrieben:The coating processes are described in more detail with reference to the following examples:
Beispiel 1example 1
Eine Faserstoffbahn
Beispiel 2Example 2
Die wie in Beispiel 1 hergestellte Faserstoffbahn
Beispiel 3 (fällt nicht unter den Hauptanspruch)Example 3 (does not fall under the main claim)
Eine Vliesbahn
Beim Recycling kann die verschmutzte Faserstoffbahn nach dem Abreißen der Foliendeckschichten kompostiert werden. Gegenüber den z. B. bei Wegwerfwindeln eingesetzten Zellstoffen mit polymeren Superabsorbern ist bei einem erfindungsgemäßen Verbundwerkstoff eine bessere Umweltverträglichkeit gegeben.During recycling, the soiled fibrous web can be composted after tearing off the folio cover layers. Opposite the z. B. used in disposable diapers pulps with polymeric superabsorbers in a composite material according to the invention is given a better environmental performance.
Claims (7)
Priority Applications (2)
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DE19824825A DE19824825B4 (en) | 1997-11-18 | 1998-06-04 | Process for producing a film composite |
DE19861467.5A DE19861467B4 (en) | 1998-06-04 | 1998-06-04 | Process for producing a film composite |
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DE19861467.5A DE19861467B4 (en) | 1998-06-04 | 1998-06-04 | Process for producing a film composite |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3692622A (en) * | 1968-12-16 | 1972-09-19 | Kimberly Clark Co | Air formed webs of bonded pulp fibers |
DE3521374A1 (en) * | 1985-06-14 | 1986-12-18 | Unilever N.V., Rotterdam | METHOD FOR PRODUCING A FILM COMPOSITE AND THAN MANUFACTURED FILM COMPOSITE |
DE8908226U1 (en) * | 1989-07-06 | 1989-08-31 | Hoechst Ag, 6230 Frankfurt | Wall covering |
DE19750890A1 (en) * | 1997-11-18 | 1999-05-27 | Alexander Maksimow | Absorbent web of compressed pulp fibres with high absorption and teat strength |
-
1998
- 1998-06-04 DE DE19861467.5A patent/DE19861467B4/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3692622A (en) * | 1968-12-16 | 1972-09-19 | Kimberly Clark Co | Air formed webs of bonded pulp fibers |
DE3521374A1 (en) * | 1985-06-14 | 1986-12-18 | Unilever N.V., Rotterdam | METHOD FOR PRODUCING A FILM COMPOSITE AND THAN MANUFACTURED FILM COMPOSITE |
DE8908226U1 (en) * | 1989-07-06 | 1989-08-31 | Hoechst Ag, 6230 Frankfurt | Wall covering |
DE19750890A1 (en) * | 1997-11-18 | 1999-05-27 | Alexander Maksimow | Absorbent web of compressed pulp fibres with high absorption and teat strength |
DE19824825A1 (en) * | 1997-11-18 | 1999-12-09 | Alexander Maksimow | Improved method and device for producing a fibrous web consisting of cellulose fibers |
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