EP0671504A1 - Process for making a foamed material from waste paper and similar material - Google Patents

Process for making a foamed material from waste paper and similar material Download PDF

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Publication number
EP0671504A1
EP0671504A1 EP95101694A EP95101694A EP0671504A1 EP 0671504 A1 EP0671504 A1 EP 0671504A1 EP 95101694 A EP95101694 A EP 95101694A EP 95101694 A EP95101694 A EP 95101694A EP 0671504 A1 EP0671504 A1 EP 0671504A1
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EP
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Prior art keywords
pulp
foamed material
production
material according
liquid
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EP95101694A
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German (de)
French (fr)
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EP0671504B1 (en
Inventor
Norbert Dr.-Ing. Habelski
Edgar Dr.-Ing. Brandauer
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Vodermair Hermann
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Vodermair Hermann
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/06—Drying
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/002—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines by using a foamed suspension
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/16—Drying webs by electrical heating
    • D21F5/167—Microwave heating

Definitions

  • the invention relates to a method for producing foamed material from waste paper and the like.
  • Paper, cardboard, waste cardboard or materials with similar properties can be used as raw materials, either according to the type or as a mixture of raw materials.
  • the invention should preferably make a contribution to environmental protection through the recovery and processing of secondary raw materials, which are available to a considerable extent.
  • Various end products can be produced by the process according to the invention, in particular components for thermal and impact sound insulation, as well as those for vibration and shock absorption, roofing or wall cladding panels, composite panels, other moldings for use as filler material for insulation and packaging purposes. Special treatments are possible by adding, for example, hydrophobicizing agents, flame retardants, putrefactive substances or reaction aids.
  • the lists are to be understood as examples.
  • An essential known process step is the production of a liquid, vzw. aqueous pulp from the raw materials mentioned, hereinafter referred to as paper pulp, including comminution and mixing of the components.
  • the task to be solved was to shorten the known methods in time, which is ultimately the prerequisite for the process to be able to be carried out continuously, for the expenditure on equipment and heat losses to be reduced.
  • This process is a drying process as a result of the removal of liquid, a material consolidation sets in during the volume increase of the pulp, which stabilizes the voids created in the pulp.
  • the process can be supported by foam-forming and stabilizing additives.
  • Microwave radiation is able to penetrate materials with a corresponding dielectric constant, for example glass or paper, without loss of energy.
  • Other materials absorb microwave radiation, ie they take over the energy of the microwaves.
  • This process is also referred to as coupling to the microwaves. This happens in the molecular area and manifests itself in a warming of the coupling material.
  • This material includes, for example, water in the liquid state. In a water-containing paper pulp, the energy provided by the microwaves is therefore transferred directly and only to the water molecules. The heat is generated in the irradiated volume, i.e.
  • the irradiated body is not dimensionally stable, as in the paper pulp under consideration, then flow paths in the form of cavities are created in the body by the steam flowing off.
  • the body takes on a porous structure. It loosens up considerably. Its volume increases. Since the hardening process due to drying of the material begins at the same time, this voluminous and porous structure is retained. Certain additives such as binders or foaming agents support this process. In terms of process technology, this means a considerable simplification of the aftertreatment. Otherwise, procedural steps are saved.
  • a technical solution for the implementation of this process for the production of foamed material, in particular moldings, depends on the objective of the production and can be operated batchwise or continuously. In terms of apparatus, it must be guaranteed that, taking into account the increase in volume of the pulp, a largely unimpeded irradiation with microwaves is possible and at the same time the water vapor can flow out of the mold uninhibited.

Abstract

Prodn. of foam material from waste paper etc. in any shape entails preliminary prodn. steps leading to a fluid, pref. water, based pulp from the raw material. Additives may be supplied to achieve the required characteristics of the finished product. Here, the foaming and solidification of the pulp results from the effect of microwave radiation. Pref. the required quantity paper pulp is introduced in any shape and following microwave radiation is released from its mould. This is made of microwave transparent material in the radiation area, does not couple with the radiation and does not impede the expansion of the paper pulp or the fluid vaporisation through the mould.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von geschäumtem Material aus Altpapier und dgl. mit beliebiger Ausgangsform. Als Rohstoffe sind gleichermaßen Papier, Pappe, Altpappe oder Materialien mit ähnlichen Eigenschaften einsetzbar, entweder sortengerecht oder als Rohstoffgemisch. Die Erfindung soll vorzugsweise einen Beitrag zum Umweltschutz durch Wiedergewinnung und Aufarbeitung von Sekundärrohstoffen, die im erheblichen Umfang zur Verfügung stehen, leisten.
Durch das erfindungsgemäße verfahren können verschiedene Endprodukte hergestellt werden, insbesondere Bauelemente zur Wärme- und Trittschalldämmung, sowie solche zur Schwingungs- und Stoßdampfung, weiterhin Dacheindeckungs- bzw. Wandverkleidungstafeln, Verbundplatten, sonstige Formkörper zur Verwendung als Füllmaterial zu Isolier-und Verpackungszwecken. Sonderbehandlungen durch Zusatz von beispielsweise Hydrophierungsmitteln, Flammenschutzmitteln, fäulnishemmenden Stoffen oder von Reaktionshelfern sind möglich.
Die Aufzählungen sind als Beispiele zu verstehen.The invention relates to a method for producing foamed material from waste paper and the like. With any starting form. Paper, cardboard, waste cardboard or materials with similar properties can be used as raw materials, either according to the type or as a mixture of raw materials. The invention should preferably make a contribution to environmental protection through the recovery and processing of secondary raw materials, which are available to a considerable extent.
Various end products can be produced by the process according to the invention, in particular components for thermal and impact sound insulation, as well as those for vibration and shock absorption, roofing or wall cladding panels, composite panels, other moldings for use as filler material for insulation and packaging purposes. Special treatments are possible by adding, for example, hydrophobicizing agents, flame retardants, putrefactive substances or reaction aids.
The lists are to be understood as examples.

Die Analyse des Standes der Technik hat ergeben, daß bereits mehrere verfahren zur Herstellung solcher Produkte bekannt und einige offensichtlich auch in Benutzung sind. Auch entsprechende Vorrichtungen zur Durchführung dieser Verfahren sowie das Endprodukt selbst findet sich im dokumentierten Stand der Technik wieder. Hierzu wird auf die nachfolgend aufgelisteten Dokumente verwiesen:
DE 31 14 527, DE 33 07 736, DE 34 20 195, DE 34 44 264, DE 35 10 214, DE 35 22 395, DE 36 24 164, DE 36 41 464, DE 37 04 309, DE 37 18 545, DE 39 00 289, DE 40 25 694, DE 41 35 069, DE 92 00 066, DE 92 16 620, DE 93 03 498.
Ein wesentlicher bekannter Verfahrensschritt ist die Herstellung eines flüssigen, vzw. wässrigen Breis aus den genannten Rohstoffen, im folgenden Beschreibungstext mit Papierbrei bezeichnet, einschließlich Zerkleinerung und Mischung der Komponenten.The analysis of the prior art has shown that several processes for the production of such products are already known and some are obviously also in use. Corresponding devices for carrying out these processes and the end product itself can also be found in the documented prior art. Please refer to the documents listed below:
DE 31 14 527, DE 33 07 736, DE 34 20 195, DE 34 44 264, DE 35 10 214, DE 35 22 395, DE 36 24 164, DE 36 41 464, DE 37 04 309, DE 37 18 545, DE 39 00 289, DE 40 25 694, DE 41 35 069, DE 92 00 066, DE 92 16 620, DE 93 03 498.
An essential known process step is the production of a liquid, vzw. aqueous pulp from the raw materials mentioned, hereinafter referred to as paper pulp, including comminution and mixing of the components.

Diese vorbereitenden Maßnahmen sind nicht Gegenstand der Erfindung, vielmehr wird darauf zurückgegriffen.
Von besonderer Bedeutung ist die Wärmebehandlung des zur Verfügung stehenden Papierbreis.These preparatory measures are not the subject of the invention, but are used instead.
The heat treatment of the available pulp is of particular importance.

Die bekannter, technischen Lösungen zur Wärmebehandlung des Papierbreis greifen ausnahmslos auf konventionelle Verfahren, Vorrichtungen bzw. Anlagen zurück.
Unter konventionell wird verstanden:

  • Die Expansion der Masse wird durch Wärmeeintrag bei Temperaturen von 120 - 140°C erreicht,
  • Wärmebehandlung bei Temperaturen über 200°C bei Wasserdampfsättigung in einem Autoklaven,
  • Thermische und mechanische Energieeinleitung im Extruder; Beim Verlassen des Extruders schäumt die Masse infolge Temperatur- und Druckabfall auf,
  • Erwärmung unter Druckanwendung allgemein,
  • Behandlung mit Heißluft und Dampf
Diese Verfahren sind sämtlich durch hohen Energiebedarf gekennzeichnet, der oftmals mit einem erheblichen apparativen Aufwand einhergeht, der wiederum aus der hohen Zahl von Verfahrensschritten resultiert. Sie arbeiten überwiegend diskontinuierlich, weil die benötigten hohen Energiemengen nicht innerhalb kürzester Zeit eintragbar sind. Die Flüssigkeitsverdampfung ist durch eine gewisse Zeitverzögerung und Trägheit charakterisiert. Daher ist die Leistungsfähigkeit nur für eine begrenzte Anzahl von Anwendungsfällen ausreichend.The known, technical solutions for the heat treatment of the pulp use, without exception, conventional processes, devices or systems.
Conventional means:
  • The expansion of the mass is achieved through heat input at temperatures of 120 - 140 ° C,
  • Heat treatment at temperatures above 200 ° C with steam saturation in an autoclave,
  • Thermal and mechanical energy input in the extruder; When leaving the extruder, the mass foams due to a drop in temperature and pressure,
  • General warming under pressure,
  • Treatment with hot air and steam
These processes are all characterized by a high energy requirement, which often involves considerable outlay on equipment, which in turn results from the high number of process steps. They mostly work discontinuously because the high amounts of energy required cannot be entered within a very short time. Liquid evaporation is characterized by a certain time delay and inertia. Therefore, the performance is only sufficient for a limited number of applications.

Die Nachbehandlung und etwaige Sonderbehandlungen sind, ebenso wie die Herstellung des Papierbreis, nicht Gegenstand des erfindungsgemäßen Verfahrens. Hier wird auf bewährte Mittel und Methoden zurückgegriffen.The aftertreatment and any special treatments, like the production of the pulp, are not the subject of the process according to the invention. Proven means and methods are used here.

Somit war die Aufgabe zu lösen, die bekannten Verfahren zeitlich zu verkürzen, was letztlich die Voraussetzung dafür ist, daß der Prozeß auch kontinuierlich durchführbar ist, daß der apparative Aufwand und Wärmeverluste reduziert werden können.Thus, the task to be solved was to shorten the known methods in time, which is ultimately the prerequisite for the process to be able to be carried out continuously, for the expenditure on equipment and heat losses to be reduced.

Diese Aufgabe wird erfindungsgemäß wie folgt gelöst:According to the invention, this object is achieved as follows:

Bekanntermaßen schäumt ein mit Flüssigkeit versetzter Papierbrei bei der Behandlung mit Wärmeenergie dann auf, wenn die Flüssigkeit zu verdampfen beginnt. Durch Zusätze kann dieser Effekt noch verstärkt werden.
Dieser Vorgang ist darin begründet, daß der Übergang der Flüssigkeit in die gasförmige Phase mit einer beachtlichen Volumenvergrößerung verbunden ist. Der aus dem Papierbrei abströmende Dampf schafft sich die notwendigen Strömungswege. Die infolge des Flüssigkeitsentzuges einsetzende Verfestigung des Papierbreis bewirkt, daß die Strömungswege als Hohlräume erhalten bleiben.
Hier setzt die erfindungsgemäße Lösung an.As is known, a liquid slurry containing paper foams when treated with thermal energy when the liquid begins to evaporate. This effect can be intensified by additives.
This process is due to the fact that the transition of the liquid to the gaseous phase is associated with a considerable increase in volume. The steam flowing out of the pulp creates the necessary flow paths. The solidification of the pulp which begins as a result of the removal of liquid causes the flow paths to be preserved as cavities.
This is where the solution according to the invention comes in.

Es wird vorgeschlagen, den Papierbrei anstelle der konventionellen Wärmebehandlung einer Mikrowellenstrahlung auszusetzen, die Vorzugsweise im Bereich von 915 MHz und 2,45 GHz liegt.
Die Vorteile dieser Methode des Energieeintrages liegen darin begründet, daß mit Mikrowellen, im Unterschied zu Wärmestrahlen, sehr hohe Energiedichten realisierbar sind und die Energie nicht von der Oberfläche aus auf den Papierbrei einwirkt, sondern in diesen eindringt und die Flüssigkeit direkt erhitzt und zum Verdampfen bringt. Bei entsprechender Energiedichte vollzieht sich der Prozeß so heftig, daß der entstehende Dampf durch die Schaffung von Wegen für seine Abströmung aus dem Volumen des durchstrahlten Papierbreis zu einem Aufblähen der Masse führt und diese in einen porösen Zustand versetzt.It is proposed to expose the paper pulp to microwave radiation instead of the conventional heat treatment, which is preferably in the range of 915 MHz and 2.45 GHz.
The advantages of this method of energy input lie in the fact that, in contrast to heat rays, very high energy densities can be achieved with microwaves and the energy does not act on the paper pulp from the surface, but penetrates into it and heats the liquid directly and evaporates it . With a corresponding energy density, the process takes place so violently that the steam produced, through the creation of paths for its outflow from the volume of the paper pulp irradiated, causes the mass to expand and puts it in a porous state.

Da dieser Vorgang infolge des Flüssigkeitsentzuges gleichzeitig ein Trocknungsprozeß ist, setzt während der Volumenvergrößerung des Papierbreis eine Materialverfestigung ein, die die im Papierbrei erzeugten Hohlräume stabilisiert. Der Prozeß kann durch schaumbildende und stabilisierende Zusätze unterstützt werden.Since this process is a drying process as a result of the removal of liquid, a material consolidation sets in during the volume increase of the pulp, which stabilizes the voids created in the pulp. The process can be supported by foam-forming and stabilizing additives.

Der beschriebene Vorgang ist auf folgende physikalische Effekte zurückzuführen, deren technische Umsetzung Gegenstand der Erfindung ist.
Mikrowellenstrahlung ist in der Lage, Materialien mit entsprechender Dielektrizitätskonstante, beispielsweise Glas oder Papier, ohne Energieverlust zu durchdringen. Andere Materialien absorbieren Mikrowellenstrahlung, d.h. sie übernehmen die Energie der Mikrowellen. Dieser Vorgang wird auch als Ankoppeln an die Mikrowellen bezeichnet. Dies geschieht im molekularen Bereich und äußert sich in einer Erwärmung des ankoppelnden Materials. Zu diesem Material gehört beispielsweise Wasser im flüssigen Zustand. In einem wasserhaltigen Papierbrei wird die durch die Mikrowellen bereitgestellte Energie demnach direkt und nur an die Wassermoleküle übertragen. Die Wärme entsteht im durchstrahlten Volumen, also im Inneren des Körpers, durch Dissipation und muß nicht, wie bei einem Wärmetransport mit einer Temperaturdifferenz als Triebkraft, von außen nach innen übertragen werden. Deshalb erwärmt sich ein Körper unter Mikrowellenbestrahlung im gesamten durchstrahlten Volumen gleichmäßig. Infolge von Wärmeverlusten an der Körperoberfläche kann die volumenspezifisch gespeicherte Wärmemenge im Körperinneren sogar größer als in der Nähe seiner Oberfläche sein. Bei entsprechender Energiedichte, die zum Verdampfen von Wasser führt, entsteht im Inneren des durchstrahlten Körpervolumens ein Überdruck, der zum Abströmen des Wasserdampes in Richtung Körperoberfläche führt.The process described is due to the following physical effects, the technical implementation of which is the subject of the invention.
Microwave radiation is able to penetrate materials with a corresponding dielectric constant, for example glass or paper, without loss of energy. Other materials absorb microwave radiation, ie they take over the energy of the microwaves. This process is also referred to as coupling to the microwaves. This happens in the molecular area and manifests itself in a warming of the coupling material. This material includes, for example, water in the liquid state. In a water-containing paper pulp, the energy provided by the microwaves is therefore transferred directly and only to the water molecules. The heat is generated in the irradiated volume, i.e. inside the body, through dissipation and does not have to be transferred from the outside to the inside, as is the case with heat transport with a temperature difference as the driving force. Therefore, a body heats up evenly in the entire irradiated volume under microwave radiation. As a result of heat loss on the body surface, the volume-specific amount of heat stored inside the body can even be larger than in the vicinity of its surface. With a corresponding energy density, which leads to the evaporation of water, an overpressure arises in the interior of the irradiated body volume, which leads to the water vapor flowing out towards the body surface.

Ist der bestrahlte Körper nicht formstabil, wie bei dem betrachteten Papierbrei, dann werden durch den abströmenden Dampf im Körper Strömungswege in Form von Hohlräumen geschaffen. Der Körper nimmt eine poröse Struktur an.
Er lockert beträchtlich auf. Sein Volumen vergrößert sich. Da in diesem Stadium gleichzeitig der Härtungsprozeß infolge Trocknung des Materials einsetzt, bleibt diese voluminöse und poröse Struktur erhalten.
Bestimmte Zusätze, wie Bindemittel oder Schaumbildner unterstützen diesen Prozeß.
Verfahrenstechnisch bedeutet das eine erhebliche Vereinfachung der Nachbehandlung. Gegenenenfalls werden Verfahrensschritte eingespart.If the irradiated body is not dimensionally stable, as in the paper pulp under consideration, then flow paths in the form of cavities are created in the body by the steam flowing off. The body takes on a porous structure.
It loosens up considerably. Its volume increases. Since the hardening process due to drying of the material begins at the same time, this voluminous and porous structure is retained.
Certain additives such as binders or foaming agents support this process.
In terms of process technology, this means a considerable simplification of the aftertreatment. Otherwise, procedural steps are saved.

Eine technische Lösung für die Durchführung dieses Verfahrens zur Herstellung von geschäumtem Material, insbesondere Formkörpern, hängt von der Zielstellung der Produktion ab und kann sowohl diskontinuierlich als auch kontinuierlich betrieben werden.
Apparativ ist zu garantieren, daß unter Berücksichtigung der Volumenvergrößerung des Papierbreis eine weitgehend ungehinderte Bestrahlung mit Mikrowellen möglich ist und gleichzeitig der Wasserdampf ungehemmt aus der Form abströmen kann.A technical solution for the implementation of this process for the production of foamed material, in particular moldings, depends on the objective of the production and can be operated batchwise or continuously.
In terms of apparatus, it must be guaranteed that, taking into account the increase in volume of the pulp, a largely unimpeded irradiation with microwaves is possible and at the same time the water vapor can flow out of the mold uninhibited.

Claims (6)

Verfahren zur Herstellung von geschäumtem Material aus Altpapier und dgl. mit beliebiger Form, wobei aus den genannten Rohstoffen in vorbereitenden Verfahrensschritten ein mit Flüssigkeit, vorzugsweise Wasser, versetzter Brei hergestellt wird, der mit Zusätzen zur Erzielung gewünschter Eigenschaften des Endproduktes versehen werden kann, dadurch gekennzeichnet, daß das Aufschäumen und Verfestigen des Breis unter Einwirkung von Mikrowellenstrahlung erfolgt.Process for the production of foamed material from waste paper and the like with any shape, whereby from the raw materials mentioned in a preparatory process step a slurry mixed with liquid, preferably water, is produced, which can be provided with additives to achieve desired properties of the end product, characterized that the foaming and solidification of the pulp takes place under the influence of microwave radiation. Verfahren zur Herstellung von geschäumtem Material nach Anspruch 1, dadurch gekennzeichnet, daß der flüssigkeitshaltige Brei, nachfolgend als Papierbrei bezeichnet, in der erforderlichen Menge in eine beliebige Form eingebracht und anschließend der Mikrowellenstrahlung ausgesetzt wird, wobei die Form im Bereich der Bestrahlung aus mikrowellendurchlässigem Material, das nicht an die Strahlung ankoppelt, gefertigt ist, und wobei die Ausdehnung des Papierbreis und das Verdampfen der Flüssigkeit durch die Form nicht wesentlich behindert wird.Process for the production of foamed material according to claim 1, characterized in that the liquid-containing pulp, hereinafter referred to as paper pulp, is introduced into the desired amount in any form and is subsequently exposed to microwave radiation, the form in the region of the irradiation being made of microwave-permeable material, which is not coupled to the radiation, is manufactured, and wherein the expansion of the pulp and the evaporation of the liquid is not significantly hindered by the shape. Verfahren zur Herstellung von geschäumtem Material nach Anspruch 1, dadurch gekennzeichnet, daß der infolge Energieeintrag entstehende Flüssigkeitsdampf abgesaugt, einem Kondensationsprozeß unterzogen und erneut für die Aufbereitung des Papierbreis benutzt wird.Process for the production of foamed material according to claim 1, characterized in that the liquid vapor arising as a result of the energy input is suctioned off, subjected to a condensation process and used again for the preparation of the pulp. Verfahren zur Herstellung von geschäumtem Material nach Anspruch 1, dadurch gekennzeichnet, daß der Prozeß der Aufschäumung und der Formgebung des Papierbreis je nach Gestaltung der Form kontinuierlich oder diskontinuierlich betrieben wird.Process for producing foamed material according to claim 1, characterized in that the process of foaming and shaping the pulp is carried out continuously or discontinuously, depending on the shape of the mold. Verfahren zur Herstellung von geschäumtem Material nach Anspruch 1, dadurch gekennzeichnet, daß dem Aufschäumungs- und Formgebungsprozeß eine oder mehrere Nachbehandlungsstufen innerhalb oder außerhalb der Form folgen, die bevorzugt die Funktionen der Nachhärtung, Resttrocknung, Oberflächenbehandlung oder Konfektionierung haben.Process for the production of foamed material according to claim 1, characterized in that the foaming and shaping process is followed by one or more post-treatment steps inside or outside the mold, which preferably have the functions of post-curing, residual drying, surface treatment or packaging. Verfahren zur Herstellung von geschäumtem Material nach den Ansprüchen 1 und 5, dadurch gekennzeichnet, daß die in den Magnetronen entstehende Wärme für mit thermischer Energie verbundene Nachbehandlungsverfahren genutzt wird.Process for the production of foamed material according to claims 1 and 5, characterized in that the heat generated in the magnetrons is used for post-treatment processes associated with thermal energy.
EP95101694A 1994-02-11 1995-02-07 Process for making a foamed material from waste paper and similar material Expired - Lifetime EP0671504B1 (en)

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Application Number Priority Date Filing Date Title
DE4404322A DE4404322A1 (en) 1994-02-11 1994-02-11 Process for the production of foamed material from waste paper and the like the like
DE4404322 1994-02-11

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EP0671504A1 true EP0671504A1 (en) 1995-09-13
EP0671504B1 EP0671504B1 (en) 1997-08-06

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AT (1) ATE156541T1 (en)
CA (1) CA2142222C (en)
DE (2) DE4404322A1 (en)
DK (1) DK0671504T3 (en)
FI (1) FI105280B (en)
NO (1) NO307191B1 (en)

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EP0740990A2 (en) * 1995-05-02 1996-11-06 Schweitzer, Jacob Process for defining the various properties of cellulose containing foams
US5707579A (en) * 1994-02-11 1998-01-13 Schweitzer, Vodermair & Schimmer-Wottrich Gbr Process for producing foamed material from waste paper and the like
FR2764315A1 (en) * 1997-06-10 1998-12-11 Daewon Paptin Foam Co Ltd METHOD FOR MANUFACTURING DAMPER AND INSULATOR MATERIAL BASED ON EXPANDED CELLULOSIC SUBSTANCE
WO2004083523A1 (en) * 2003-03-21 2004-09-30 Saueressig Gmbh + Co. Production method for an absorbent fibre product and corresponding absorbent fibre product
WO2005007968A1 (en) * 2003-07-16 2005-01-27 Fira International Limited Recycling of lignocellulose based board materials

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DE19546296A1 (en) * 1995-05-02 1996-11-07 Schweitzer Jacob Prodn. of cellulose-based foam prods. with defined properties
DE19546295A1 (en) * 1995-12-12 1997-06-19 Schweitzer Jacob Prodn. of cellulose-based foam prods. with defined properties
KR20180064535A (en) 2015-11-03 2018-06-14 킴벌리-클라크 월드와이드, 인크. Paper tissue with high bulk and low lint
GB201612889D0 (en) * 2016-07-26 2016-09-07 Natural Resources (2000) Ltd Moulding of articles
US11255051B2 (en) 2017-11-29 2022-02-22 Kimberly-Clark Worldwide, Inc. Fibrous sheet with improved properties
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DE4207233A1 (en) * 1992-03-07 1993-11-18 Geier Henninger Kurt Prodn. of porous filter body for exhaust gas - by saturating paper and/or cardboard material with water, stirring and drying or hardening obtd. foamed pulp

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DE3420195A1 (en) * 1984-05-30 1985-12-12 Friedrich 2807 Achim Priehs Process for producing insulating material from scrap paper and/or cardboard
DE4105245C1 (en) * 1991-02-20 1992-10-22 Viessmann Werke Gmbh & Co, 3559 Allendorf, De Rapidly drying moulded bodies - formed by suction on fibrous sludge, placed in enclosed zone at low-pressure
DE4207233A1 (en) * 1992-03-07 1993-11-18 Geier Henninger Kurt Prodn. of porous filter body for exhaust gas - by saturating paper and/or cardboard material with water, stirring and drying or hardening obtd. foamed pulp

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5707579A (en) * 1994-02-11 1998-01-13 Schweitzer, Vodermair & Schimmer-Wottrich Gbr Process for producing foamed material from waste paper and the like
EP0740990A2 (en) * 1995-05-02 1996-11-06 Schweitzer, Jacob Process for defining the various properties of cellulose containing foams
EP0740990A3 (en) * 1995-05-02 1997-05-28 Schweitzer Jacob Process for defining the various properties of cellulose containing foams
FR2764315A1 (en) * 1997-06-10 1998-12-11 Daewon Paptin Foam Co Ltd METHOD FOR MANUFACTURING DAMPER AND INSULATOR MATERIAL BASED ON EXPANDED CELLULOSIC SUBSTANCE
GB2326124A (en) * 1997-06-10 1998-12-16 Daewon Paptin Foam Co Ltd In-mould method for the manufacture of a foamed cellulose heat insulating material
WO2004083523A1 (en) * 2003-03-21 2004-09-30 Saueressig Gmbh + Co. Production method for an absorbent fibre product and corresponding absorbent fibre product
US7758722B2 (en) 2003-03-21 2010-07-20 Saueressig Gmbh + Co. Production method for an absorbent fiber product and corresponding absorbent fiber product
WO2005007968A1 (en) * 2003-07-16 2005-01-27 Fira International Limited Recycling of lignocellulose based board materials

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ATE156541T1 (en) 1997-08-15
NO950510D0 (en) 1995-02-10
CA2142222A1 (en) 1995-08-12
DK0671504T3 (en) 1998-03-02
NO307191B1 (en) 2000-02-21
CA2142222C (en) 2000-11-07
FI105280B (en) 2000-07-14
DE4404322A1 (en) 1995-08-17
EP0671504B1 (en) 1997-08-06
DE59500454D1 (en) 1997-09-11
FI950589A0 (en) 1995-02-10
NO950510L (en) 1995-08-14
FI950589A (en) 1995-08-12

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