EP0990733A1 - Verfahren zur Abtötung von Keimen in papierfaserhaltigem Material sowie Vorrichtungen zur Durchführung des Verfahrens - Google Patents
Verfahren zur Abtötung von Keimen in papierfaserhaltigem Material sowie Vorrichtungen zur Durchführung des Verfahrens Download PDFInfo
- Publication number
- EP0990733A1 EP0990733A1 EP99115241A EP99115241A EP0990733A1 EP 0990733 A1 EP0990733 A1 EP 0990733A1 EP 99115241 A EP99115241 A EP 99115241A EP 99115241 A EP99115241 A EP 99115241A EP 0990733 A1 EP0990733 A1 EP 0990733A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steam
- heating
- content
- compression
- temperature treatment
- 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.)
- Granted
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
Definitions
- the invention relates to a method according to the preamble of claim 1.
- the stock preparation and paper manufacturing processes known at present worked at different places with high temperatures, which already leads to a considerable reduction in germs.
- Such Process steps in waste paper processing are e.g. the hot dispersion and the Bleach.
- the hot dispersion process the material is brought to a dry content between Brought 20 and 30%, then e.g. by blowing in water vapor heated at least 85 ° C and then in a disperger or kneader with the entry of high specific work.
- Disruptive components which only are difficult to remove, crushed and crushed by the intense fiber-to-fiber friction be distributed so that they no longer interfere with the end product.
- Dispersion processes can also carried out at temperatures above 100 ° C and with appropriate overpressure become.
- Bleaching processes also often work at temperatures above 85 ° C, which means that Effectiveness of the added bleaching chemicals improved and accelerated. Often the bleaching chemicals are also mixed in by a disperser and can then work in a stack volume. Such a method is e.g. out known from DE 36 10 940 A1.
- the highly effective also vent the air that is between and within the fibers, completely removed.
- Treatment at high temperatures in the absence of air and with complete water / steam wetting results in a significant improvement the germ killing.
- the water vapor present in the high temperature treatment can wet the air-free material and thus the germs particularly well, which for the Germ killing is beneficial.
- Venting can be done in several fonts, e.g. first by compressing of the material and simultaneous or subsequent removal of the compressed air. Their transport through the material plug must then be as short as possible because the plug has hardly any voids. It can also be useful in a second font with the remaining voids of the compressed material an air-free steam. The material is used for even greater freedom from air loosened again and rinsed with steam.
- both the temperature and the effective time influence the success of the Germ killing.
- the process is particularly effective at one temperature well above 100 ° C, e.g. at a temperature of 130 ° C an effective time of a few seconds is enough.
- the application of the invention is only with little additional effort connected, namely when a hot and / or bleaching treatment anyway to be carried out. Then the procedure can be modified accordingly using the features of the invention perfected the germ killing become.
- FIG. 1 shows the functional procedure, without giving details devices or control loops.
- the Vent so far that a residual air content of at most 1% is included. The air content is based on the total volume of the Materials M related.
- the deaerated material goes into the high temperature treatment 1, in which it is at a temperature of at least 80 ° C, preferably above 100 ° C, is heated. The addition of a heating medium H is indicated.
- the vented and heated Material M1 is conveyed into the disperger 2 after a certain exposure time it is dispersed with the help of mechanical energy P.
- Chemicals can Improve disinfection significantly.
- Suitable chemicals CH are e.g. Peroxide, which is advantageously dosed higher than it already is for bleaching the fiber material would be required.
- the dispersion can also be carried out together with the degassing process (Rinse cycle) are made (Fig. 3).
- Fig. 4 shows a further process variant with the special feature that the material M is first drained by compressing 4 and immediately afterwards the ventilation with the help of steam D.
- the Venting and high temperature treatment essentially in one step respectively.
- the material M can advantageously be expanded during the venting leave and loosen it up so that new contact surfaces for the hot steam arise. Trapped air is thereby exposed and can be flushed out.
- Fig. 5 shows a schematic diagram of a special ventilation device, the is suitable to vent the material M as far as it is necessary to carry out the Procedure is required.
- the device is based on the principle Screw press built, in which a conical screw conveyor 8 in one conical strainer basket 7 is drivably mounted. The conicity reduces the Press chamber 5 in the conveying direction of the screw conveyor 8.
- Another one, not shown here One possibility would be a screw conveyor shaft that becomes thicker in the direction of conveyance the effect that the screen basket 7 and the screw conveyor 8 have a cylindrical shape could (cheaper). Mixed forms of these two principles are also conceivable.
- the Material M is introduced through the inlet 9 into the housing and then from the Screw conveyor 8 detected and pressed.
- the material M is so far compresses that the gas-filled residual volumes become very small. Because of the strainer 7 not all air must flow backwards against the direction of conveyance, but it can also exit radially from the pressed material into the gas space 6. That has the advantage short distances.
- the vented material M is then discharged through the outlet 10.
- Fig. 6 shows the combination of a compression device 13 with itself immediately following device for high temperature treatment.
- up to one is also in the compression device 13 vented to a certain degree.
- the pressed, partially vented material M is directly in a here shown as heating screw 14 high temperature treatment device promoted.
- heating screw 14 high temperature treatment device promoted.
- the plug seals, which is particularly important if the heating screw 14 is operated under excess pressure.
- This too Venting device includes a gas outlet 12. That from the connector incident material M expands, is loosened by racket 17 and then swirled by the screw conveyor 18 and transported further.
- the steam D fed into the heating screw 14 drives the material M out of the Residual air, which then flows out through the gas outlet 12.
- a Valve the pressure in the heating screw controlled or regulated.
- FIG. 7 shows the combination of a ventilation device 19 with one another immediately following heating screw 14 for high temperature treatment. It is the venting device 19 is arranged vertically, so that the pressed, vented Material M 1 can drop directly into the heating screw 14. In the connector 15 between the ventilation device 19 and the heating screw 14 is at Operation of the plant a plug of compressed material M. This seals against any excess pressure in the heating screw 14. Because the heating screw 14 is operated with direct feed of steam D, part of the steam can be used as Purge gas act and through a gas outlet 12 on the housing of the heating screw 14th emerge.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Processing Of Solid Wastes (AREA)
- Apparatus For Disinfection Or Sterilisation (AREA)
Abstract
Description
- Fig. 1 bis 4
- jeweils ein Schema einer Ausführung des erfindungsgemäßen Verfahrens;
- Fig. 5
- eine Entlüftungsvorrichtung zur Durchführung des Verfahrens;
- Fig. 6 + 7
- jeweils eine Kombination von Entlüftungsvorrichtung und direkt anschließender Erhitzungsvorrichtung.
Claims (22)
- Verfahren zur Abtötung von Keimen in papierfaserhaltigem Material (M), insbesondere Altpapier, bei dem das Material (M) in wässrigem Gemisch einer Hochtemperaturbehandlung (1) mit mindestens 80° C unterzogen wird,
dadurch gekennzeichnet,
daß das Material (M) vor oder bei der Hochtemperaturbehandlung (1) bis zu einem Restluftgehalt unter 1 Vol.% entlüftet wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Entlüftung bis zu einem Restluftgehalt betrieben wird, der unter 0,1 Vol-% liegt. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß das Material durch Komprimieren (3, 4) ohne Änderung des Wassergehaltes mindestens so weit verdichtet wird, daß die gasgefüllten Hohlräume den geforderten Restluftgehalt einnehmen. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß das Material (M) durch Komprimieren (3, 4) unter Änderung des Wassergehaltes auf einen Feststoffgehalt über 15 %, vorzugsweise 20 bis 35 %, verdichtet und dabei entlüftet wird und daß unmittelbar danach die Hochtemperaturbehandlung (1) erfolgt. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß das Material (M) vor oder bei der Hochtemperaturbehandlung (1) mit einem Dampf (D) gespült und dabei gleichzeitig aufgeheizt wird. - Verfahren nach Anspruch 5,
dadurch gekennzeichnet,
daß der Dampf (D) Wasserdampf ist. - Verfahren nach Anspruch 5 oder 6,
dadurch gekennzeichnet,
daß das Material (M) durch Komprimieren (3, 4) auf einen Feststoffgehalt über 15 %, vorzugsweise 20 bis 35 %, verdichtet und anschließend expandiert wird, und daß beim Expandieren die Spülung mit Dampf (D) erfolgt. - Verfahren nach Anspruch 5, 6 oder 7,
dadurch gekennzeichnet,
daß das Material (M) nach dem Komprimieren (3, 4) aufgelockert wird. - Verfahren nach Anspruch 5, 6, 7 oder 8,
dadurch gekennzeichnet,
daß Dampf (D) und Material (M) im Gegenstrom bewegt werden. - Verfahren nach einem der Ansprüche 3 bis 9,
dadurch gekennzeichnet,
daß nach dem Expandieren und/oder Auflockern eine Aufheizung auf mindestens 120° C durchgeführt wird und daß der Stoff anschließend mindestens zwei Sekunden lang bei einer Temperatur über 120° C gestapelt bzw. gefördert wird. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß unmittelbar nach der Hochtemperaturbehandlung (1) eine Dispergierung (2) oder Knetung des Materials durchgeführt wird. - Verfahren nach einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet,
daß gleichzeitig mit der Hochtemperaturbehandlung (1) eine Dispergierung (2) oder Knetung des Materials durchgeführt wird. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß das Material (M) zur Hochtemperaturbehandlung (1) mit Peroxid vermischt wird. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß dem Material (M, M1) mindestens 4 % Peroxid zugemischt wird, bezogen auf den Trockengehalt des Materials (M, M1). - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die Hochtemperaturbehandlung (1) ohne reduzierende Chemikalien durchgeführt wird. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß das Material einen massenbezogenen Feststoffgehalt zwischen 15 und 80 % hat. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß der Feststoff des Materials im wesentlichen aus Altpapier besteht. - Vorrichtung zur Durchführung des Verfahrens nach einem der voranstehenden Ansprüche mit einer Kompressionsvorrichtung für das papierfaserhaltige Material M zur Erzeugung eines Materialpfropfens, dessen Feststoffgehalt zwischen 10 und 40 % liegt und mit einer stromabwärts geschalteten Heizvorrichtung, die Mittel zur direkten Einspeisung von Dampf (D) aufweist,
dadurch gekennzeichnet,
daß die Kompressionsvorrichtung direkt an die Heizvorrichtung angeschlossen ist, so daß der Pfropfen infolge der Förderwirkung der Kompressionsvorrichtung in die Heizvorrichtung hineingefördert wird und daß die Heizvorrichtung mit einem Gasauslaß (12) versehen ist und Mittel zur Erzeugung eines Spülstromes mit Hilfe des eingespeisten Dampfes (D) durch den Gasauslaß (12) vorhanden sind. - Vorrichtung nach Anspruch 18,
dadurch gekennzeichnet,
daß die Heizvorrichtung unter Überdruck betreibbar ist. - Vorrichtung nach Anspruch 18 oder 19,
dadurch gekennzeichnet,
daß die Heizvorrichtung eine Heizschnecke (14) ist. - Vorrichtung nach Anspruch 18 oder 19,
dadurch gekennzeichnet,
daß die Heizvorrichtung ein mit Dampfeinspeisung betreibbarer Kneter oder Disperger ist. - Vorrichtung zur Verwendung bei der Durchführung des Verfahrens nach einem der voranstehenden Ansprüche 1 bis 18,mit einem Gehäuse, das mit einem Einlaß (9) und einem Auslaß (10) für das Material (M) versehen ist,mit einer Förderschnecke (8), die in einem Siebkorb (7) dreh- und antreibbar angeordnet ist, wobei sich der zwischen der Förderschnecke (8) und dem Siebkorb (7) gelegene Preßraum (5) in Förderrichtung, zumindest in einem Teilabschnitt, verkleinert, dadurch gekennzeichnet,
daß die Vorrichtung einen in den Preßraum (5) mündenden Dampfeinlaß (11) aufweist sowie einen Gasauslaß (12), der an den Gasraum (6), der sich zwischen Siebkorb (7) und Gehäuse befindet, angeschlossen ist und daß Mittel zur Erzeugung eines Dampfspülstromes vom Dampfeinlaß (11) zum Gasauslaß (12) vorhanden sind.23. Vorrichtung nach Anspruch 22,
dadurch gekennzeichnet,
daß sich der Siebkorb (7) konisch verengt und daß der Außendurchmesser der Förderschnecke (8) dementsprechend abnimmt.24. Vorrichtung nach Anspruch 22 oder 23,
dadurch gekennzeichnet,
daß der Siebkorb (7) mit Rundlöchern von höchstens 2 mm Durchmesser versehen ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19845513 | 1998-10-02 | ||
DE19845513A DE19845513A1 (de) | 1998-10-02 | 1998-10-02 | Verfahren zur Abtötung von Keimen in papierfaserhaltigem Material sowie Vorrichtungen zur Durchführung des Verfahrens |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0990733A1 true EP0990733A1 (de) | 2000-04-05 |
EP0990733B1 EP0990733B1 (de) | 2004-01-21 |
Family
ID=7883250
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99115241A Expired - Lifetime EP0990733B1 (de) | 1998-10-02 | 1999-08-02 | Verfahren zur Abtötung von Keimen in papierfaserhaltigem Material sowie Vorrichtungen zur Durchführung des Verfahrens |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0990733B1 (de) |
AT (1) | ATE258247T1 (de) |
DE (2) | DE19845513A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1731432A1 (de) | 2005-06-07 | 2006-12-13 | Poly-clip System GmbH & Co. KG | Clipmaschine und Verfahren zum Einrichten einer Clipmaschine |
DE102008053456A1 (de) | 2008-10-28 | 2010-04-29 | Poly-Clip System Gmbh & Co. Kg | Clipdrucküberwachung mit Piezo-Aufnehmer |
CN105862480A (zh) * | 2015-02-05 | 2016-08-17 | 维美德技术有限公司 | 用于预热待分散的回收纤维材料的装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2224591A1 (de) * | 1973-04-05 | 1974-10-31 | Wallen & Co Ab Lennart | |
DE2710806A1 (de) * | 1976-03-12 | 1977-09-15 | Interox | Verfahren zur desinfektion von altpapier |
FR2406022A1 (fr) * | 1977-10-17 | 1979-05-11 | Omnium Francais Indl Cal | Procede utilisant un vide prealable pour la fabrication de pates a papier |
WO1995009267A1 (en) * | 1993-09-29 | 1995-04-06 | Antti Aho | Pretreatment of chips |
WO1995025196A1 (en) * | 1994-03-15 | 1995-09-21 | Ingemar Bystedt | Impregnation of wood pieces by compression followed by expansion before grinding into pulp |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3741863A (en) * | 1971-08-27 | 1973-06-26 | Rust Eng Co | Method of recycling waste cellulosic materials |
US3891497A (en) * | 1973-03-22 | 1975-06-24 | Beloit Corp | Non-aqueous defiberizing process of waste paper in the presence of steam and a liquid nonmiscible in water, e.g., tetrachlorethylene |
SE7506271L (sv) * | 1975-06-02 | 1976-12-03 | Sellbergs Ab A Z | Sett att framstella hygieniserat returpapper fran pappershaltigt avfall, speciellt hushallsavfall |
FR2357684A1 (fr) * | 1976-03-12 | 1978-02-03 | Interox | Procede pour la desinfection des vieux papiers |
CH649330A5 (en) * | 1980-11-25 | 1985-05-15 | Escher Wyss Gmbh | Process for increasing the specific volume in the reprocessing of waste paper pulp |
DE3610940A1 (de) * | 1986-03-04 | 1987-09-10 | Escher Wyss Gmbh | Hochtemperatur-hochkonsistenz-schnellbleiche |
NO159494C (no) * | 1986-10-23 | 1989-01-04 | Kvaerner Eureka As | Fremgangsmaate ved bleking av cellulosemasse eller fraksjon derav, anlegg til bruk ved gjennomfoeringen av fremgangsmaaten. |
US5262003A (en) * | 1991-09-18 | 1993-11-16 | The Black Clawson Company | Method and system for defibering paper making materials |
-
1998
- 1998-10-02 DE DE19845513A patent/DE19845513A1/de not_active Withdrawn
-
1999
- 1999-08-02 EP EP99115241A patent/EP0990733B1/de not_active Expired - Lifetime
- 1999-08-02 DE DE59908351T patent/DE59908351D1/de not_active Expired - Fee Related
- 1999-08-02 AT AT99115241T patent/ATE258247T1/de not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2224591A1 (de) * | 1973-04-05 | 1974-10-31 | Wallen & Co Ab Lennart | |
DE2710806A1 (de) * | 1976-03-12 | 1977-09-15 | Interox | Verfahren zur desinfektion von altpapier |
FR2406022A1 (fr) * | 1977-10-17 | 1979-05-11 | Omnium Francais Indl Cal | Procede utilisant un vide prealable pour la fabrication de pates a papier |
WO1995009267A1 (en) * | 1993-09-29 | 1995-04-06 | Antti Aho | Pretreatment of chips |
WO1995025196A1 (en) * | 1994-03-15 | 1995-09-21 | Ingemar Bystedt | Impregnation of wood pieces by compression followed by expansion before grinding into pulp |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1731432A1 (de) | 2005-06-07 | 2006-12-13 | Poly-clip System GmbH & Co. KG | Clipmaschine und Verfahren zum Einrichten einer Clipmaschine |
DE102008053456A1 (de) | 2008-10-28 | 2010-04-29 | Poly-Clip System Gmbh & Co. Kg | Clipdrucküberwachung mit Piezo-Aufnehmer |
DE202008017822U1 (de) | 2008-10-28 | 2010-09-02 | Poly-Clip System Gmbh & Co. Kg | Clipdrucküberwachung mit Piezo-Aufnehmer |
CN105862480A (zh) * | 2015-02-05 | 2016-08-17 | 维美德技术有限公司 | 用于预热待分散的回收纤维材料的装置 |
CN105862480B (zh) * | 2015-02-05 | 2017-07-18 | 维美德技术有限公司 | 用于预热待分散的回收纤维材料的装置 |
Also Published As
Publication number | Publication date |
---|---|
DE59908351D1 (de) | 2004-02-26 |
ATE258247T1 (de) | 2004-02-15 |
EP0990733B1 (de) | 2004-01-21 |
DE19845513A1 (de) | 2000-04-06 |
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