EP0824160B1 - Process for the manufacture of paper making pulp - Google Patents
Process for the manufacture of paper making pulp Download PDFInfo
- Publication number
- EP0824160B1 EP0824160B1 EP97112494A EP97112494A EP0824160B1 EP 0824160 B1 EP0824160 B1 EP 0824160B1 EP 97112494 A EP97112494 A EP 97112494A EP 97112494 A EP97112494 A EP 97112494A EP 0824160 B1 EP0824160 B1 EP 0824160B1
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- EP
- European Patent Office
- Prior art keywords
- fibers
- shortened
- fiber suspension
- fiber
- bleaching
- 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
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/007—Modification of pulp properties by mechanical or physical means
-
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
Definitions
- the invention relates to a method for producing pulp, the Fibers from annual plants or from secondary raw materials produced from them contains, with the fibers bleached, shortened and in further processing steps processed into a homogeneous paper mass.
- the invention further relates to a method for producing shortened fibers of annual plants or of secondary raw materials produced from annual plants.
- rotational movements such as when stirring or pumping arise, the above-mentioned fiber accumulations tend to spinning, that quickly develop into long braids. So it had to a special process for the stock preparation of vegetable fibers be developed.
- the fibers are divided into so-called "Cake” pressed and several of these cakes hung in a bleaching kettle.
- bleaching chemicals pressure and temperature the pulp oxidizes to the desired whiteness.
- the cake linger in the bleaching kettle, they are rinsed with water to remove the bleaching chemicals to remove.
- the entire bleaching process takes several hours Claim.
- the cakes are taken out, smashed and slowly fed to a Dutchman filled with water.
- the fibers also shortened in a process lasting several hours.
- a further step becomes the fiber suspension that can now be pumped with conventional pump systems further shortened and fibrillated until it - with the necessary for paper production Add additives - get to the paper machine.
- Suitable bleaching agents are described, for example, in JP-A-56004791.
- US Pat. No. 4,983,256 describes a process for producing pulp, where the strict separation between crushing and bleaching the Fibers is lifted.
- the cotton coming from the bale introduced simultaneously with water into a device consisting of two elongated, interlocking threads.
- the threads have different Divide different pitches and orientations, which also correspond to the different process steps.
- the cotton fibers are mixed with water.
- the mixture is slowed down and comminuted of the fibers. Because of the great fiber length of cotton fibers comes however, there are already clumps and braids here. These lumps of cotton can not be resolved by the interlocking threads, so that the cotton agglomerates clog the mixing device and further processing not possible.
- the invention is therefore based on the object of a process for stock preparation to propose natural fibers, in particular fibers from annual plants, which simplifies the production process as well as a continuous Processing of the fibers enables.
- the invention is based on the basic idea of the fibers of annual plants in a first process step to a length that allows a to produce a homogeneous, pumpable suspension and only afterwards to bleach. Because leave below a certain fiber length the fibers suspend homogeneously in water and no longer tend to Clumping or spinning. In this way, existing ones continuous technologies from the woodworking paper industry for the bleaching process, since there are no conveying problems, e.g. at the Pumps, occur. In addition to annual plants, they can also be produced from them Semi-finished and finished products, such as spun threads or woven Textiles, i.e. thread remnants or rags, are used as secondary raw materials and processed according to the inventive method. This Semi-finished and finished products are called secondary raw materials in the following.
- Annual plants refer to all plant species in this context, which are harvested or collected annually and for the mechanical-chemical Digestion can be used as a pulp for papermaking, for example Cotton, flax, straw, bagasse, banana trees, linters, Hemp etc.
- the fibers are mixed with water in one Mixing device introduced and accelerated immediately, so that a volume flow with a solids content, the so-called consistency, of less than 10% is generated.
- a volume flow with a solids content the so-called consistency, of less than 10% is generated.
- the fiber mass is dewatered with Bleaching chemicals mixed and stored in a bleaching tower for a period of time, to give the fibers the desired whiteness.
- the fiber mass is finally the usual fed further grinding in a cycler.
- the fiber material is usually supplied in the form of tightly packed bales 1 and must therefore be crushed in a first step using a milling machine 2 and be loosened up.
- cotton fibers are used but also fibers of other annual plants, such as hemp, flax etc. and products spun or woven from them (secondary raw materials) process well into paper products.
- the fibers 1 are weighed and simultaneously in a certain ratio introduced with water 3 in a mixing device 4, accelerated briefly and fed to a refiner 5.
- a refiner 5 preferably a cone refiner.
- other refiner forms are also conceivable, e.g. a disc refiner. Since the fiber suspension quasi through the simultaneous Water and fibers are introduced and these are transported immediately the fibers are given no opportunity to form lumps or fiber braids to build. Rather, they reach the refiner 5 evenly distributed. This is partly due to the fact that the fiber suspension only has a consistency of a maximum of 10%. There the fibers are ground and shortened and fibrillated. In the twin-wire belt press arranged below 6 the fibers are up to a dry content of approx. 40% drained.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Papiermasse, die Fasern von Einjahrespflanzen oder von aus ihnen erzeugten Sekundärrohstoffen enthält, wobei die Fasern gebleicht, gekürzt und in weiteren Verarbeitungsschritten zu einer homogenen Papiermasse verarbeitet werden. Die Erfindung betrifft ferner ein Verfahren zur Herstellung von gekürzten Fasern von Einjahrespflanzen oder von aus Einjahrespflanzen erzeugten Sekundärrohstoffen.The invention relates to a method for producing pulp, the Fibers from annual plants or from secondary raw materials produced from them contains, with the fibers bleached, shortened and in further processing steps processed into a homogeneous paper mass. The The invention further relates to a method for producing shortened fibers of annual plants or of secondary raw materials produced from annual plants.
Aus umweltpolitischen Gründen wird erwogen, Einjahrespflanzen, wie Hanf, Flachs etc., künftig speziell für die Papierproduktion anzubauen und zu verwenden, um die Abholzung der Wälder zumindest für diesen Industriezweig zu verringern oder gar vollständig zu verhindern.For environmental reasons, annual plants such as Hemp, flax etc., to be cultivated especially for paper production in the future to use deforestation at least for this industry to reduce or even completely prevent.
Derzeit werden Papiere aus Fasern pflanzlicher Herkunft, wie Baumwolle, Linters, Hanf etc. hauptsächlich für hochwertige Papiere, wie Aktien, Wertdokumente, Banknoten etc. verwendet, da die Rohstoffe teuer und die Stoffaufbereitung pflanzlicher Fasern sehr aufwendig ist. Die relativ langen Fasern lassen sich im Wasser nicht vereinzeln, d.h. es bilden sich Faseranhäufungen, die sich wiederum zu größeren Klumpen aglomerieren. Durch das Einbringen von Rotationsbewegungen, wie sie beim Rühren oder Pumpen entstehen, neigen die obengenannten Faseranhäufungen zu Verspinnungen, die sich schnell zu meterlangen Zöpfen entwickeln. Es mußte daher ein spezielles Verfahren für die Stoffaufbereitung von pflanzlichen Fasern entwickelt werden.Papers made from fibers of vegetable origin, such as cotton, Linters, hemp etc. mainly for high-quality papers such as stocks, value documents, Banknotes etc. used because the raw materials are expensive and the Stock preparation of vegetable fibers is very complex. The relatively long ones Fibers cannot be separated in water, i.e. fiber accumulations are formed, which in turn agglomerate into larger clumps. By the introduction of rotational movements, such as when stirring or pumping arise, the above-mentioned fiber accumulations tend to spinning, that quickly develop into long braids. So it had to a special process for the stock preparation of vegetable fibers be developed.
Bei diesem Verfahren werden die Fasern in einem ersten Schritt in sogenannte "Kuchen" gepreßt und mehrere dieser Kuchen in einen Bleichkessel eingehängt. Unter Zuhilfenahme von Bleichchemikalien, Druck und Temperatur oxidiert der Faserstoff zur gewünschten Weiße. Noch während die Kuchen in dem Bleichkessel verweilen, werden sie mit Wasser gespült, um die Bleichchemikalien zu entfernen. Der gesamte Bleichprozeß nimmt mehrere Stunden in Anspruch. Anschließend werden die Kuchen herausgenommen, zerschlagen und langsam einem mit Wasser gefüllten Holländer zugeführt. Hier werden die Fasern ebenfalls in einem mehrstündigen Prozeß gekürzt. In einem weiteren Verfahrensschritt wird die nun mit herkömmlichen Pumpsystemen förderbare Fasersuspension weiter gekürzt und fibrilliert bis sie - mit den für die Papierherstellung notwendigen Zusätzen versehen - zur Papiermaschine gelangt.In this process, the fibers are divided into so-called "Cake" pressed and several of these cakes hung in a bleaching kettle. With the help of bleaching chemicals, pressure and temperature the pulp oxidizes to the desired whiteness. Even while the cake linger in the bleaching kettle, they are rinsed with water to remove the bleaching chemicals to remove. The entire bleaching process takes several hours Claim. Then the cakes are taken out, smashed and slowly fed to a Dutchman filled with water. Here are the fibers also shortened in a process lasting several hours. In a further step becomes the fiber suspension that can now be pumped with conventional pump systems further shortened and fibrillated until it - with the necessary for paper production Add additives - get to the paper machine.
Da die Papiermaschine kontinuierlich arbeitet und daher ständig neue Papiermasse zugeführt werden muß, andererseits jedoch die Stoffaufbereitung der Fasern nur diskontinuierlich und in zeitintensiven Einzelprozessen erfolgt, ist es notwendig, mehrere Bleichkessel und Holländer parallel einzusetzen. Dieses Verfahren ist somit sehr aufwendig und bedarf vieler einzelner separater Verfahrensschritte.Because the paper machine works continuously and therefore new paper pulp constantly must be supplied, on the other hand, however, the stock preparation of the fibers only discontinuously and in time-consuming individual processes, it is necessary use several bleaching kettles and Dutch in parallel. This procedure is therefore very complex and requires many separate process steps.
Ein ähnlich aufwendiges Verfahren wird in der DE-A-1916063 beschrieben. Hier wird die Baumwolle vor dem Bleichprozeß in mehreren Schritten gekocht und gewaschen.A similarly complex process is described in DE-A-1916063. Here will the cotton is boiled and washed in several steps before the bleaching process.
Geeignete Bleichmittel werden beispielsweise in der JP-A-56004791 beschrieben.Suitable bleaching agents are described, for example, in JP-A-56004791.
Die US-A-4,983,256 schließlich beschreibt ein Verfahren zur Herstellung von Papiermasse, bei dem die strikte Trennung zwischen Zerkleinern und Bleichen der Fasern aufgehoben wird. Hierbei wird die von den Ballen kommende Baumwolle gleichzeitig mit Wasser in eine Vorrichtung eingebracht, die aus zwei langgestreckten, ineinandergreifenden Gewinden besteht. Die Gewinde weisen in verschiedenen Bereichen unterschiedliche Ganghöhen und Ausrichtungen auf, welche auch den unterschiedlichen Verfahrensschritten entsprechen. In den ersten beiden Verfahrensschritten werden die Baumwollfasern mit Wasser gemischt. Im anschließenden Bereich erfolgt ein Abbremsen des Gemischs verbunden mit einer Zerkleinerung der Fasern. Aufgrund der großen Faserlänge von Baumwollfasern kommt es hier jedoch bereits zu Klumpen- und Zopfbildung. Diese Baumwollklumpen können von den ineinandergreifenden Gewinden nicht aufgelöst werden, so daß die Baumwollaglomerate die Mischvorrichtung verstopfen und eine Weiterverarbeitung nicht möglich ist.Finally, US Pat. No. 4,983,256 describes a process for producing pulp, where the strict separation between crushing and bleaching the Fibers is lifted. Here the cotton coming from the bale introduced simultaneously with water into a device consisting of two elongated, interlocking threads. The threads have different Divide different pitches and orientations, which also correspond to the different process steps. In the first two process steps the cotton fibers are mixed with water. In the following In the area, the mixture is slowed down and comminuted of the fibers. Because of the great fiber length of cotton fibers comes however, there are already clumps and braids here. These lumps of cotton can not be resolved by the interlocking threads, so that the cotton agglomerates clog the mixing device and further processing not possible.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Stoffaufbereitung von natürlichen Faserstoffen, insbesondere Fasern von Einjahrespflanzen vorzuschlagen, welches eine Vereinfachung des Produktionsablaufs sowie eine kontinuierliche Verarbeitung der Fasern ermöglicht.The invention is therefore based on the object of a process for stock preparation to propose natural fibers, in particular fibers from annual plants, which simplifies the production process as well as a continuous Processing of the fibers enables.
Diese Aufgabe wird durch die in den unabhängigen Ansprüchen angegebenen Merkmale gelöst. Weiterbildungen sind Gegenstand der Unteransprüche.This object is achieved by those specified in the independent claims Features resolved. Further training is the subject of the subclaims.
Die Erfindung beruht auf dem Grundgedanken, die Fasern von Einjahrespflanzen in einem ersten Verfahrensschritt auf eine Länge zu kürzen, die es erlaubt, eine homogene, pumpbare Suspension herzustellen und erst anschließend zu bleichen. Denn unterhalb einer bestimmten Faserlänge lassen sich die Fasern homogen in Wasser suspendieren und neigen nicht länger zu Verklumpungen oder Verspinnungen. Auf diese Weise können bestehende kontinuierliche Technologien aus der holzverarbeitenden Papierindustrie für den Bleichvorgang eingesetzt werden, da keine Förderprobleme, z.B. beim Pumpen, auftreten. Neben Einjahrespflanzen können auch aus diesen hergestellte Halb- und Fertigprodukte, wie versponnene Fäden oder gewobene Textilien, sprich Fadenreste oder Hadern, als Sekundärrohstoffe eingesetzt und nach dem erfindungsgemäßen Verfahren verarbeitet werden. Diese Halb- und Fertigprodukte werden im folgenden Sekundärrohstoffe genannt.The invention is based on the basic idea of the fibers of annual plants in a first process step to a length that allows a to produce a homogeneous, pumpable suspension and only afterwards to bleach. Because leave below a certain fiber length the fibers suspend homogeneously in water and no longer tend to Clumping or spinning. In this way, existing ones continuous technologies from the woodworking paper industry for the bleaching process, since there are no conveying problems, e.g. at the Pumps, occur. In addition to annual plants, they can also be produced from them Semi-finished and finished products, such as spun threads or woven Textiles, i.e. thread remnants or rags, are used as secondary raw materials and processed according to the inventive method. This Semi-finished and finished products are called secondary raw materials in the following.
Einjahrespflanzen bezeichnen in diesem Zusammenhang alle Pflanzenarten, die jährlich geerntet bzw. eingesammelt und für den mechanisch-chemischen Aufschluß als Faserstoff für die Papierherstellung verwendbar sind, beispielsweise Baumwolle, Flachs, Stroh, Bagasse, Bananenstauden, Linters, Hanf etc.Annual plants refer to all plant species in this context, which are harvested or collected annually and for the mechanical-chemical Digestion can be used as a pulp for papermaking, for example Cotton, flax, straw, bagasse, banana trees, linters, Hemp etc.
Für die Kürzung der Fasern werden die Fasern zeitgleich mit Wasser in eine Mischvorrichtung eingebracht und sofort beschleunigt, so daß ein Volumenstrom mit einem Feststoffgehalt, der sogenannten Stoffdichte, von weniger als 10 % erzeugt wird. Durch das sofortige Abziehen der Fasersuspension entstehen keine wiederkehrenden Strömungen oder Verspinnungen, die den weiteren Transport der Suspension behindern könnten. Die Fasersuspension kann daher in einem üblichen Refiner gekürzt werden.To shorten the fibers, the fibers are mixed with water in one Mixing device introduced and accelerated immediately, so that a volume flow with a solids content, the so-called consistency, of less than 10% is generated. By immediately pulling off the fiber suspension there are no recurring currents or spinning that could hinder further transport of the suspension. The fiber suspension can therefore be shortened in a normal refiner.
Direkt im Anschluß an die Kürzung wird die Fasermasse entwässert, mit Bleichchemikalien gemischt und in einem Bleichturm für gewisse Zeit gelagert, um den Fasern die gewünschte Weiße zu verleihen. Im Anschluß an einen oder mehrere Waschvorgänge wird die Fasermasse schließlich der üblichen weiteren Mahlung in einer Zyklieranlage zugeführt.Immediately after the cut, the fiber mass is dewatered with Bleaching chemicals mixed and stored in a bleaching tower for a period of time, to give the fibers the desired whiteness. In connection to one or more washes, the fiber mass is finally the usual fed further grinding in a cycler.
Weitere Vorteile und Ausführungsformen werden anhand der Figur erläutert. Es wird darauf hingewiesen, daß die Figur lediglich schematisch die wesentlichen Verfahrensschritte der Erfindung zeigt und daher keinen Anspruch auf Vollständigkeit erhebt.Further advantages and embodiments are explained with the aid of the figure. It should be noted that the figure is only schematic shows essential method steps of the invention and therefore no claim completeness.
Das Fasermaterial wird meist in Form von dicht gepackten Ballen 1 geliefert
und muß daher in einem ersten Schritt mit Hilfe einer Fräse 2 zerkleinert
und aufgelockert werden. In erster Linie werden Baumwollfasern verwendet,
aber auch Fasern anderer Einjahrespflanzen, wie Hanf, Flachs etc. und
aus ihnen gesponnene oder gewobene Produkte (Sekundärrohstoffe), lassen
sich gut zu Papierprodukten verarbeiten.The fiber material is usually supplied in the form of tightly packed
Die Fasern 1 werden gewogen und in einem bestimmten Verhältnis gleichzeitig
mit Wasser 3 in eine Mischvorrichtung 4 eingebracht, kurz beschleunigt
und einem Refiner 5 zugeführt. Hierbei handelt es sich bevorzugt um
einen Kegelrefiner. Denkbar sind jedoch auch andere Refinerformen, wie z.B.
ein Scheibenrefiner. Da die Fasersuspension quasi durch das gleichzeitige
Einbringen von Wasser und Fasern entsteht und diese sofort weitertransportiert
wird, erhalten die Fasern keine Gelegenheit, Klumpen oder Faserzöpfe
zu bilden. Sie gelangen vielmehr gleichmäßig verteilt in den Refiner 5.
Dies beruht zum Teil darauf, daß die Fasersuspension lediglich eine Stoffdichte
von maximal 10 % aufweist. Dort werden die Fasern gemahlen und
dabei gekürzt und fibrilliert. In der nachfolgend angeordneten Doppelsiebbandpresse
6 werden die Fasern bis zu einem Trockenanteil von ca. 40 %
entwässert. Hierbei entsteht eine Fasermatte, die in einem Zerkleinerungsaggregat
zu Krümelstoff zerrissen wird. Der Krümelstoff wird in einem
Hochkonsistenzmischer 7 mit den Bleichchemikalien gemischt und im
nächsten Schritt einem Bleichturm 8 zugeführt. Dort können die Chemikalien
einwirken und je nach dem gewünschten Grad der Weiße bis zu zwei
Stunden lagern. Im Anschluß an den Bleichvorgang werden die Fasern gewaschen,
um die Restchemikalien zu entfernen und den weiteren üblichen
Prozeßschritten der Papierproduktion zugeführt, wie durch den Pfeil 9 angedeutet.The
Alle Prozeßschritte laufen kontinuierlich ab. Das bedeutet, Vorrichtungen, in welchen länger andauernde Prozesse ablaufen, wie z.B. das Bleichen, müssen in ihrem Fassungsvermögen so ausgelegt sein, daß trotz der langen Verweilzeit eine kontinuierliche Beschickung sowie ein kontinuierliches Verlassen der Vorrichtung möglich ist.All process steps run continuously. That means devices in which longer-lasting processes are running, e.g. bleaching, must be designed in such a way that despite the long dwell time a continuous loading and a continuous exit the device is possible.
Aufgrund des kontinuierlichen Prozeßablaufs entfällt auch der Nachteil des bisherigen Verfahrens, daß mehrere parallel arbeitende Vorrichtungen in der Produktionslinie vorgesehen werden müssen. Auf diese Weise wird der Produktionsablauf bezogen auf Personal-, Energie- und Chemikalienkosten erheblich kostengünstiger.Due to the continuous process flow, the disadvantage of previous method that several devices working in parallel in the Production line must be provided. In this way the Production process based on personnel, energy and chemical costs considerably cheaper.
Claims (9)
- A method for producing paper pulp containing fibers of annual plants or of secondary raw materials produced therefrom, the fibers being bleached, shortened and processed into a homogeneous paper pulp in further processing steps, characterized in that the shortening of the fibers takes place prior to bleaching, water and fibers are introduced simultaneously into a mixing apparatus in a first step, the fiber suspension having a stock density of less than 10%, the fiber suspension is briefly accelerated subsequent to the mixing apparatus, the fibers having no opportunity to form lumps or fiber braids due to immediate removal of the fiber suspension, and the fibers are then shortened in a further apparatus to a length which permits production of a homogeneous, pumpable suspension of the shortened fibers.
- A method according to claim 1, characterized in that the fiber suspension is supplied to a refiner and the fibers shortened therein.
- A method according to claim 1 or 2, characterized in that the shortened fibers are separated from the water, in particular up to a dry content of 40%.
- A method according to at least one of claims 1 to 3, characterized in that the shortened fibers are mixed with the bleaching chemicals in a high-consistency mixer and then stored in a bleaching tower.
- A method according to claim 4, characterized in that the fibers remain in the bleaching tower for about two hours.
- A method for producing shortened fibers of annual plants or of secondary raw materials produced therefrom, characterized by the following steps:simultaneously introducing water and fibers into a mixer, the fiber suspension having a stock density of less than 10%,briefly accelerating the fiber suspension, the fibers having no opportunity to form lumps or fiber braids due to immediate removal of the fiber suspension,shortening the fibers in a refiner.
- A method according to at least one of claims 1 to 6, characterized in that the annual plants used are cotton, linters, flax, etc.
- Use of the method according to at least one of claims 1 to 5 for producing security paper.
- Use of the method according to claim 6 for producing security paper.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19632865A DE19632865A1 (en) | 1996-08-14 | 1996-08-14 | Process for the production of pulp |
| DE19632865 | 1996-08-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0824160A1 EP0824160A1 (en) | 1998-02-18 |
| EP0824160B1 true EP0824160B1 (en) | 2001-12-05 |
Family
ID=7802677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97112494A Expired - Lifetime EP0824160B1 (en) | 1996-08-14 | 1997-07-22 | Process for the manufacture of paper making pulp |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5976320A (en) |
| EP (1) | EP0824160B1 (en) |
| AT (1) | ATE210219T1 (en) |
| DE (2) | DE19632865A1 (en) |
| NO (1) | NO322526B1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6174412B1 (en) | 1998-03-02 | 2001-01-16 | Purely Cotton, Inc. | Cotton linter tissue products and method for preparing same |
| US5989837A (en) * | 1998-07-13 | 1999-11-23 | Wisconsin Alumni Research Foundation | Immortalized human keratinocyte cell line |
| US8173799B2 (en) * | 2004-04-13 | 2012-05-08 | Hercules Incorporated | Raw cotton linters composition, method of making, and uses thereof |
| CN1985048A (en) * | 2004-07-20 | 2007-06-20 | 赫尔克里士公司 | Process for sheeting raw cotton linters |
| EP2402504A1 (en) * | 2010-06-29 | 2012-01-04 | M-real Oyj | Transparent paper containing fibrous materials from annual plants and/or other quick-growing non-wooden fibrous materials |
| CN108425263A (en) * | 2018-05-14 | 2018-08-21 | 薛润林 | A kind of cotton linter alkali-compressed air pulping process and device |
| CN109706773A (en) * | 2018-12-29 | 2019-05-03 | 重庆理文卫生用纸制造有限公司 | A kind of pulping process of high-cleanness, high primary colors bamboo pulp |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2099400A (en) * | 1936-10-19 | 1937-11-16 | Champagne Paper Corp | Preparation of paper pulp |
| GB1239311A (en) * | 1968-04-24 | 1971-07-14 | ||
| JPS564791A (en) * | 1979-06-18 | 1981-01-19 | Kogyo Gijutsuin | Bleaching of mechanical pulp |
| SU1060731A1 (en) * | 1982-07-06 | 1983-12-15 | Институт Органической Химии Ан Киргсср | Method of producing cotton pulp |
| US4547263A (en) * | 1983-02-28 | 1985-10-15 | Quame Babington A | Method for obtaining useful products from green pseudostem, including papermaking pulp plantain |
| FR2629844B1 (en) * | 1988-04-06 | 1991-09-27 | Clextral | PROCESS FOR THE MANUFACTURE OF A PAPER PULP FOR TRUST USE |
| US5085735A (en) * | 1989-09-05 | 1992-02-04 | Kamyr Ab | Method of refining cellulosic fibrous material with successive expansions before impacts, and expansions, to achieve increased fiber flexibility |
| WO1997022749A1 (en) * | 1995-12-19 | 1997-06-26 | Kvaerner Hymac Inc. | Process for treating refiner pulp |
-
1996
- 1996-08-14 DE DE19632865A patent/DE19632865A1/en not_active Withdrawn
-
1997
- 1997-07-22 EP EP97112494A patent/EP0824160B1/en not_active Expired - Lifetime
- 1997-07-22 AT AT97112494T patent/ATE210219T1/en not_active IP Right Cessation
- 1997-07-22 DE DE59705632T patent/DE59705632D1/en not_active Expired - Fee Related
- 1997-08-05 NO NO19973596A patent/NO322526B1/en not_active IP Right Cessation
- 1997-08-08 US US08/908,970 patent/US5976320A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE59705632D1 (en) | 2002-01-17 |
| US5976320A (en) | 1999-11-02 |
| EP0824160A1 (en) | 1998-02-18 |
| DE19632865A1 (en) | 1998-02-19 |
| ATE210219T1 (en) | 2001-12-15 |
| NO973596L (en) | 1998-02-16 |
| NO322526B1 (en) | 2006-10-16 |
| NO973596D0 (en) | 1997-08-05 |
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