DE59908351D1 - Process for killing germs in paper fiber-containing material and devices for carrying out the process - Google Patents
Process for killing germs in paper fiber-containing material and devices for carrying out the processInfo
- Publication number
- DE59908351D1 DE59908351D1 DE59908351T DE59908351T DE59908351D1 DE 59908351 D1 DE59908351 D1 DE 59908351D1 DE 59908351 T DE59908351 T DE 59908351T DE 59908351 T DE59908351 T DE 59908351T DE 59908351 D1 DE59908351 D1 DE 59908351D1
- Authority
- DE
- Germany
- Prior art keywords
- heating
- content
- steam
- stage
- compressed
- 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 - Fee Related
Links
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
Landscapes
- 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
To destroy germs in materials containing paper fibers, the infected material (M) is initially degassed virtually completely. It is then heated (1) intensively at least at 80 deg C, followed by dispersion (2). For special handling, chemical additives (CH) are introduced into the process. The material (M) has a residual air content of <= 1 vol% before or during the heating stage (1). The degassing is to give a pref. residual air content in the material (M) of <= 0.1 vol%. The material (M) is compressed (3) without affecting its water content, at least to a compression stage where the gas-filled hollow zones take in the residual air content. Or the compression changes the water content to give it a solid content of \-15% and pref. 20-35% with a resulting air extraction, directly followed by heating (1). Before or during heating, the compressed material (M) is loosened and flushed with vapor and pref. steam, which also raises the material temp. The steam flow is against the direction of material (M) travel. After the compressed material (M) has been expanded and/or loosened, it is heated to at least 120 deg C, and held in a stack or a flow path for a dwell time of at least 2 secs. at 120 deg C. The material is dispersed (2) or kneaded, directly after the heating stage (1). In preparation for the heating stage (1), the material (1) is mixed with peroxide at a level of at least 4% of the material dry content. The heating is applied without the use of reduction chemicals. The material (M) has a solid content of 15-80 mass%, mainly of used paper. An Independent claim is included for an appts. with a compression stage connected directly to the heating stage, to feed compressed material plugs into the heater. The heating stage has a gas exhaust, and a steam flushing system using steam from the exhaust.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19845513A DE19845513A1 (en) | 1998-10-02 | 1998-10-02 | For the disinfection of used paper materials it is compressed to extract the residual air for intensive heating followed by dispersion with added chemicals if required |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE59908351D1 true DE59908351D1 (en) | 2004-02-26 |
Family
ID=7883250
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19845513A Withdrawn DE19845513A1 (en) | 1998-10-02 | 1998-10-02 | For the disinfection of used paper materials it is compressed to extract the residual air for intensive heating followed by dispersion with added chemicals if required |
| DE59908351T Expired - Fee Related DE59908351D1 (en) | 1998-10-02 | 1999-08-02 | Process for killing germs in paper fiber-containing material and devices for carrying out the process |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19845513A Withdrawn DE19845513A1 (en) | 1998-10-02 | 1998-10-02 | For the disinfection of used paper materials it is compressed to extract the residual air for intensive heating followed by dispersion with added chemicals if required |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0990733B1 (en) |
| AT (1) | ATE258247T1 (en) |
| DE (2) | DE19845513A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005026219B4 (en) | 2005-06-07 | 2007-12-13 | Poly-Clip System Gmbh & Co. Kg | Clip machine and method for setting up a clip machine |
| DE202008017822U1 (en) | 2008-10-28 | 2010-09-02 | Poly-Clip System Gmbh & Co. Kg | Clip pressure monitoring with piezo pickup |
| FI125635B (en) * | 2015-02-05 | 2015-12-31 | Valmet Technologies Oy | Device for preheating dispersible circulating pulp |
Family Cites Families (13)
| 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 |
| SE371657B (en) * | 1973-04-05 | 1974-11-25 | Wallen & Co Ab Lennart | |
| SE7506271L (en) * | 1975-06-02 | 1976-12-03 | Sellbergs Ab A Z | WAY TO PRODUCE HYGIENIZED RETURN PAPER FROM PAPERY WASTE, SPECIAL HOUSEHOLD WASTE |
| IT1071347B (en) * | 1976-03-12 | 1985-04-02 | Interox Sa | PROCESS FOR DISINFECTION OF OLD PAPER |
| FR2357684A1 (en) * | 1976-03-12 | 1978-02-03 | Interox | Disinfecting old or waste paper for recycle - by adding hydrogen peroxide during pulping |
| FR2406022A1 (en) * | 1977-10-17 | 1979-05-11 | Omnium Francais Indl Cal | Paper pulp prodn. - using high vacuum to improve saturation of liquors without damage to fibrous content |
| 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 (en) * | 1986-03-04 | 1987-09-10 | Escher Wyss Gmbh | HIGH TEMPERATURE HIGH CONSISTENCY FAST WHITE |
| NO159494C (en) * | 1986-10-23 | 1989-01-04 | Kvaerner Eureka As | PROCEDURE BY BLACKING CELLULOSMASS OR FRACTION THEREOF, PLANT FOR USE BY IMPLEMENTING THE PROCEDURE. |
| US5262003A (en) * | 1991-09-18 | 1993-11-16 | The Black Clawson Company | Method and system for defibering paper making materials |
| FI934281A0 (en) * | 1993-09-29 | 1993-09-29 | Antti Aho | FOERBEHANDLING AV FLIS |
| SE502555C2 (en) * | 1994-03-15 | 1995-11-13 | Ingemar Bystedt | Method and apparatus for impregnating wood pieces in the production of abrasive pulp |
-
1998
- 1998-10-02 DE DE19845513A patent/DE19845513A1/en not_active Withdrawn
-
1999
- 1999-08-02 EP EP99115241A patent/EP0990733B1/en not_active Expired - Lifetime
- 1999-08-02 DE DE59908351T patent/DE59908351D1/en not_active Expired - Fee Related
- 1999-08-02 AT AT99115241T patent/ATE258247T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE258247T1 (en) | 2004-02-15 |
| EP0990733A1 (en) | 2000-04-05 |
| EP0990733B1 (en) | 2004-01-21 |
| DE19845513A1 (en) | 2000-04-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8364 | No opposition during term of opposition | ||
| 8327 | Change in the person/name/address of the patent owner |
Owner name: VOITH PATENT GMBH, 89522 HEIDENHEIM, DE |
|
| 8339 | Ceased/non-payment of the annual fee |