EP0504130A2 - Method for the manufacture of ligno-cellulosic fibre products - Google Patents
Method for the manufacture of ligno-cellulosic fibre products Download PDFInfo
- Publication number
- EP0504130A2 EP0504130A2 EP92890049A EP92890049A EP0504130A2 EP 0504130 A2 EP0504130 A2 EP 0504130A2 EP 92890049 A EP92890049 A EP 92890049A EP 92890049 A EP92890049 A EP 92890049A EP 0504130 A2 EP0504130 A2 EP 0504130A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- glue
- lignocellulosic
- excess water
- lignocellulosic material
- 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
Links
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
Definitions
- the invention relates to a process for the production of products from lignocellulosic fibers, for example fiberboard, according to which pre-shredded, lignocellulosic material such as wood chips or the like is boiled under pressure after the excess water has been squeezed out, and is then ground to fibers which, after adding water-treated water Glue dried and then fed to further processing, for example plate presses.
- the excess water from the treatment of the lignocellulosic material is either supplied to receiving water or - in newer plants - disposed of by (biological) sewage plants or by evaporation plants, whereas the glue is entirely made with fresh water. This is disadvantageous in terms of environmental pollution and the high disposal and fresh water costs in ecological, technical and economic terms.
- the aim of the invention is to perfect the method mentioned at the outset while avoiding the disadvantages indicated.
- This goal is achieved according to the invention in that the excess water squeezed out of the lignocellulosic material - optionally mixed with fresh water - is fed to the glue preparation.
- the measure according to the invention reduces the amount of wastewater to a minimum, which results in all the following advantages such as reduced environmental pollution, low disposal costs and low fresh water requirements.
- the pH value of the glue is adjusted once and for all to that of the lignocellulosic material by chemicals (for example ammonia) in such a way that the glue requirement is as low as possible. Random pH value fluctuations of the material during production can therefore occur are not taken into account, which is why the amount of glue is rarely optimally adapted to the amount of fiber.
- the throughput is 10 tons of absolutely dry wood per hour.
- the moisture of the wood is 50%.
- the total throughput mass is therefore 20,000 kg / h.
- excess water is pressed out on the one hand by means of a stuffing screw, and on the other hand the residual wood is put under pressure for subsequent cooking and defibration. After the stuffing screw, the moisture of the residual wood is 47%.
- the 10 tons of dry wood now accounts for 53% of the total throughput mass, which results in a total throughput mass of 18,868 kg / h after the stuffing screw: 1132kg / h water are therefore squeezed out.
- 300 kg / h of rinse water are added. This results in a total excess water volume of 1432 kg / h, which would have to be removed or disposed of according to the current state of the art.
- the glue requirement is 10% solid resin based on the 10 ton / h dry wood throughput.
- 10% water based on the throughput of 10 tons / h is required for the glue preparation, i.e. 1000 kg / h. If excess water is used for the glue preparation - in extreme cases without fresh water admixture - only 432 kg / h of waste water has to be disposed of instead of 1432 kg / h. However, this minimum value increases to the extent that fresh water is also used for the glue preparation.
- the pH of the entire excess water is continuously adjusted to the pH of the lignocellulosic fibers by means of a pH control. If there is less excess water than is needed for the glue preparation, fresh water must be added, whereby the pH value control also includes the setting of the mixing ratio. The same applies analogously if it is desired from the start to carry out the glue preparation on the basis of a mixture of waste water and fresh water. It is essential that, in contrast to the prior art, a constant pH adjustment is carried out.
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zu Herstellung von Produkten aus Lignozellulosefasern, beispielsweise Faserplatten, gemäß welchem vorzerkleinertes, lignozelluloses Material wie Hackschnitzel od. dgl. nach Auspressen des Überschußwassers unter Druck gekocht und hierauf zu Fasern gemahlen wird, die nach Zusatz von mit Wasser aufbereitetem Leim getrocknet und sodann der Weiterverarbeitung, beispielsweise Plattenpressen, zugeführt werden.The invention relates to a process for the production of products from lignocellulosic fibers, for example fiberboard, according to which pre-shredded, lignocellulosic material such as wood chips or the like is boiled under pressure after the excess water has been squeezed out, and is then ground to fibers which, after adding water-treated water Glue dried and then fed to further processing, for example plate presses.
Derzeit wird das Überschußwasser aus der Aufbereitung des lignozellulosen Materials entweder Vorflutern zugeführt oder - in neueren Anlagen - durch (biologische) Kläranlagen bzw. durch Eindampfanlagen entsorgt,der Leim wird dagegen zur Gänze mit Frischwasser hergestellt. Dies ist im Hinblick auf die Umweltbelastung bzw. die hohen Entsorgungs- und Frischwasserkosten in ökologischer, technischer und wirtschaftlicher Hinsicht nachteilig.At present, the excess water from the treatment of the lignocellulosic material is either supplied to receiving water or - in newer plants - disposed of by (biological) sewage plants or by evaporation plants, whereas the glue is entirely made with fresh water. This is disadvantageous in terms of environmental pollution and the high disposal and fresh water costs in ecological, technical and economic terms.
Ziel der Erfindung ist die Vervollkommnung des eingangs genannten Verfahrens unter Vermeidung der aufgezeigten Nachteile. Dieses Ziel wird erfindungsgemäß dadurch erreicht, daß das aus dem lignozellulosem Material ausgepreßte Überschußwasser - gegebenenfalls mit Frischwasser vermengt - der Leimaufbereitung zugeführt wird.The aim of the invention is to perfect the method mentioned at the outset while avoiding the disadvantages indicated. This goal is achieved according to the invention in that the excess water squeezed out of the lignocellulosic material - optionally mixed with fresh water - is fed to the glue preparation.
Durch die erfindungsgemäße Maßnahme wird der Abwasseranfall auf ein Minimum reduziert, woraus sich sämtliche Folgevorteile wie reduzierte Umweltbelastung, geringe Entsorgungskosten und niedriger Frischwasserbedarf ergeben.The measure according to the invention reduces the amount of wastewater to a minimum, which results in all the following advantages such as reduced environmental pollution, low disposal costs and low fresh water requirements.
Bei den derzeit bekannten Verfahren wird der pH-Wert des Leimes durch Chemikalien (z.B. Ammoniak) jeweils ein für allemal so auf jenen des lignozellulosen Materials eingestellt, daß der Leimbedarf möglichst gering ist.Zufällige pH-Wert-Schwankungen des Materials während der Produktion können daher nicht berücksichtigt werden, weshalb die Leimmenge selten optimal an die Fasermenge angepaßt ist. Im Hinblick auf die erfindungsgemäße Abwasserzugabe zur Leimaufbereitung sowie im Hinblick auf mögliche pH-Wert-Änderungen des lignozellulosen materials ist es daher im Einklang mit der Erfindung günstig, wenn der pH-Wert des Überschußwassers und gegebenenfalls das mischungsverhältnis zwischen Überschußwasser und Frischwasser in Abhängigkeit vom pH-Wert der lignozellulosen Fasern durch eine pH-Wert-Regelung eingestellt wird.In the currently known processes, the pH value of the glue is adjusted once and for all to that of the lignocellulosic material by chemicals (for example ammonia) in such a way that the glue requirement is as low as possible. Random pH value fluctuations of the material during production can therefore occur are not taken into account, which is why the amount of glue is rarely optimally adapted to the amount of fiber. With regard to the addition of waste water according to the invention for the treatment of glue and with regard to possible changes in the pH of the lignocellulosic material, it is therefore advantageous in accordance with the invention if the pH of the excess water and, if appropriate, the mixing ratio between excess water and fresh water as a function of pH -Value of the lignocellulosic fibers is adjusted by a pH control.
Die Erfindung wird im folgenden anhand eines Beispieles näher erläutert.The invention is explained in more detail below using an example.
Bei einer Zerfaserungsanlage sei die Durchsatzmenge 10 Tonnen absolut trockenes Holz pro Stunde. Die Feuchtigkeit des Holzes sei 50%. Die Gesamtdurchsatzmasse beträgt daher 20.000 kg/h. mittels einer Stopfschnecke wird einerseits Überschußwasser ausgepreßt, anderseits das Restholz für ein nachfolgendes Kochen und Zerfasern unter Druck gesetzt. Nach der Stopfschnecke betrage die Feuchtigkeit des Restholzes 47%. Dies bedeutet, daß der 10 Tonnen Trockenholzanteil nunmehr 53% der gesamten Durchsatzmasse ausmacht, woraus sich nach der Stopfschnecke eine Gesamtdurchsatzmasse von 18.868 kg/h ergibt: es werden daher 1132kg/h Wasser ausgepreßt. Um ein sicheres Abführen des Preßwassers zu gewährleisten, werden 300 kg/h Spülwasser zugesetzt. Daraus ergibt sich eine gesamte Überschußwassermenge von 1432 kg/h, die nach dem derzeitigen Stand der Technik abgeführt bzw. entsorgt werden müßte.In a fiberizing plant, the throughput is 10 tons of absolutely dry wood per hour. The moisture of the wood is 50%. The total throughput mass is therefore 20,000 kg / h. excess water is pressed out on the one hand by means of a stuffing screw, and on the other hand the residual wood is put under pressure for subsequent cooking and defibration. After the stuffing screw, the moisture of the residual wood is 47%. This means that the 10 tons of dry wood now accounts for 53% of the total throughput mass, which results in a total throughput mass of 18,868 kg / h after the stuffing screw: 1132kg / h water are therefore squeezed out. To ensure that the press water is drained away safely, 300 kg / h of rinse water are added. This results in a total excess water volume of 1432 kg / h, which would have to be removed or disposed of according to the current state of the art.
Der Leimbedarf sei 10% Festharz bezogen auf die 10 Tonnen /h Trockenholzdurchsatz. Bei einer Leimkonsistenz von 50% wird daher zur Leimaufbereitung 10% Wasser bezogen auf die Durchsatzmenge von 10 Tonnen/h benötigt, also 1000 kg/h. Wird für die Leimaufbereitung zur Gänze Überschußwasser - also im Extremfall ohne Frischwasserbeimengung - verwendet, sind statt 1432 kg/h bloß 432 kg/h Abwasser zu entsorgen. Dieser Minimalwert erhöht sich allerdings in dem Ausmaß, in dem für die Leimaufbereitung auch Frischwasser verwendet wird.The glue requirement is 10% solid resin based on the 10 ton / h dry wood throughput. With a glue consistency of 50%, 10% water based on the throughput of 10 tons / h is required for the glue preparation, i.e. 1000 kg / h. If excess water is used for the glue preparation - in extreme cases without fresh water admixture - only 432 kg / h of waste water has to be disposed of instead of 1432 kg / h. However, this minimum value increases to the extent that fresh water is also used for the glue preparation.
Obiges Beispiel (Kostenbasis 1991) ergibt unter der Annahme von öS 5/m³ Frischwasser einen Kostenvorteil von insgesamt öS 112.000 pro Jahr und eine Einsparung von anteiligen Investitionskosten für die Abwasserbeseitigung von ca. öS 1,000.000.The example above (cost basis 1991) assumes a cost advantage of a total of € 112,000 per year and a saving in proportionate investment costs for wastewater disposal of approx.
In gegenständlichem Beispiel wird der pH-wert des gesamten Überschußwassers auf den pH-wert der lignozellulosen Fasern durch eine pH-wert-Regelung laufend eingestellt. Sollte weniger Überschußwasser anfallen, als für die Leimaufbereitung benötigt wird, so ist Frischwasser zuzusetzen, wobei die pH-wert-Regelung auch die Einstellung des Mischungsverhältnisses inkludiert. Analoges gilt auch dann, wenn von Haus aus gewünscht wird, die Leimaufbereitung auf Basis eines Gemisches von Abwasser und Frischwasser vorzunehmen.
Wesentlich hiebei ist, daß im Gegensatz zum Stand der Technik eine laufende pH-wert-Anpassung vorgenommen wird.In the present example, the pH of the entire excess water is continuously adjusted to the pH of the lignocellulosic fibers by means of a pH control. If there is less excess water than is needed for the glue preparation, fresh water must be added, whereby the pH value control also includes the setting of the mixing ratio. The same applies analogously if it is desired from the start to carry out the glue preparation on the basis of a mixture of waste water and fresh water.
It is essential that, in contrast to the prior art, a constant pH adjustment is carried out.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT508/91 | 1991-03-08 | ||
| AT50891A AT394741B (en) | 1991-03-08 | 1991-03-08 | METHOD FOR PRODUCING LIGNOCELLULOSE FIBER PRODUCTS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0504130A2 true EP0504130A2 (en) | 1992-09-16 |
| EP0504130A3 EP0504130A3 (en) | 1993-02-03 |
| EP0504130B1 EP0504130B1 (en) | 1995-11-29 |
Family
ID=3492464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19920890049 Expired - Lifetime EP0504130B1 (en) | 1991-03-08 | 1992-03-05 | Method for the manufacture of ligno-cellulosic fibre products |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0504130B1 (en) |
| AT (1) | AT394741B (en) |
| DE (1) | DE59204458D1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2401069B (en) * | 2003-03-10 | 2006-01-04 | Andritz Ag Maschf | Process and device for discharging wood chips from a digester and conveying the raw material to a refiner |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2036882A1 (en) * | 1969-04-14 | 1970-12-31 | Etelkozi Emile | |
| FR2303895A1 (en) * | 1975-03-13 | 1976-10-08 | Pelzer & Roehrl | METHOD FOR ADJUSTING THE ACTIVITY AND HARDNESS OF THE WATER USED FOR PAPER PRODUCTION |
| USRE29770E (en) * | 1973-09-14 | 1978-09-19 | Isorel S.A. | Manufacture of fiberboard according to the wet method with closed backwater system |
| WO1983001637A1 (en) * | 1981-10-28 | 1983-05-11 | Danielsson, Ove | Process of producing fiberboard according to the wet method |
| WO1989003911A1 (en) * | 1987-10-27 | 1989-05-05 | Kamyr Aktiebolag | A method of removing organic substances from effluents from pulp and paper manufacturing processes |
| EP0381965A2 (en) * | 1989-02-07 | 1990-08-16 | Bison-Werke Bähre & Greten GmbH & Co. KG | Method and device for the production of fibrous material containing ligno-cellulose in the production of fibre boards by the dry process |
-
1991
- 1991-03-08 AT AT50891A patent/AT394741B/en not_active IP Right Cessation
-
1992
- 1992-03-05 DE DE59204458T patent/DE59204458D1/en not_active Expired - Lifetime
- 1992-03-05 EP EP19920890049 patent/EP0504130B1/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2036882A1 (en) * | 1969-04-14 | 1970-12-31 | Etelkozi Emile | |
| USRE29770E (en) * | 1973-09-14 | 1978-09-19 | Isorel S.A. | Manufacture of fiberboard according to the wet method with closed backwater system |
| FR2303895A1 (en) * | 1975-03-13 | 1976-10-08 | Pelzer & Roehrl | METHOD FOR ADJUSTING THE ACTIVITY AND HARDNESS OF THE WATER USED FOR PAPER PRODUCTION |
| WO1983001637A1 (en) * | 1981-10-28 | 1983-05-11 | Danielsson, Ove | Process of producing fiberboard according to the wet method |
| WO1989003911A1 (en) * | 1987-10-27 | 1989-05-05 | Kamyr Aktiebolag | A method of removing organic substances from effluents from pulp and paper manufacturing processes |
| EP0381965A2 (en) * | 1989-02-07 | 1990-08-16 | Bison-Werke Bähre & Greten GmbH & Co. KG | Method and device for the production of fibrous material containing ligno-cellulose in the production of fibre boards by the dry process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2401069B (en) * | 2003-03-10 | 2006-01-04 | Andritz Ag Maschf | Process and device for discharging wood chips from a digester and conveying the raw material to a refiner |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA50891A (en) | 1991-11-15 |
| DE59204458D1 (en) | 1996-01-11 |
| AT394741B (en) | 1992-06-10 |
| EP0504130B1 (en) | 1995-11-29 |
| EP0504130A3 (en) | 1993-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3412225A1 (en) | Process for producing wood fibre boards | |
| EP0294566B1 (en) | Method and plant for the production of boards from plaster and fibres | |
| DE69823338T2 (en) | ADHESIVE COMPOSITION AND THEIR USE | |
| LU85673A1 (en) | METHOD FOR PRODUCING A UREA-FORMALDEHYDE RESIN WITH A VERY LOW MOLDER RATIO FROM FORMALDEHYDE TO UREA | |
| DE2832509B1 (en) | Process for the production of chipboard | |
| EP0504130B1 (en) | Method for the manufacture of ligno-cellulosic fibre products | |
| DE4229396C2 (en) | Process for the production of chipboard or fiberboard | |
| EP0363891B1 (en) | Fibre-reinforced hydraulically set building material, and process of its production | |
| AT403023B (en) | METHOD FOR PRODUCING WOOD FIBER PANELS | |
| DE3390039T1 (en) | Process for the production of fibreboard in the dry process | |
| EP1284845B1 (en) | Method for producing a binder solution | |
| EP0018355A1 (en) | Wood chip board and process for its production | |
| DE2835752C2 (en) | ||
| EP1775086A2 (en) | Method of making brightly coloured fibre boards | |
| DE3204910C2 (en) | ||
| DE2447590A1 (en) | METHOD FOR MANUFACTURING PANELS FROM WOOD BASE MATERIAL AND BINDING AGENT, SUCH AS CHIPBOARDS, FIBERBOARDS OR THE LIKE. | |
| DE4232760C1 (en) | Plaster-bound moulding contg. lignocellulose fibre reinforcement - obtd. from fibre slurry from cellulose@ mfr. and opt. lime slurry and waste contg. set plaster from moulding e.g. plasterboard mfr. | |
| DE2230429A1 (en) | Large fibre-board prodn - using a starch-phosphoric acid react prod as binder | |
| EP0742087B1 (en) | Continuous process for making pressed panels | |
| DE10017524A1 (en) | Production of binder liquor from tannin-containing bark, for use e.g. in the production of fiberboard, involves pulping bark in hot aqueous medium with ground, used fiberboard containing amino-resin binder | |
| WO1998031729A1 (en) | Intermediate for the production of lignin polymerizates and their use in the production of derived timber products | |
| DE1303355C2 (en) | METHOD AND DEVICE FOR MANUFACTURING CHIPBOARD | |
| DE945890C (en) | Process for the production of composite fiber-particle boards | |
| AT290576B (en) | Substrate for sowing, growing or growing plants and process for its production | |
| DE1223534B (en) | Process for the production of wood chipboard |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE ES FR IT |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): DE ES FR IT |
|
| 17P | Request for examination filed |
Effective date: 19930714 |
|
| 17Q | First examination report despatched |
Effective date: 19940912 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE ES FR IT |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT Effective date: 19951129 Ref country code: FR Effective date: 19951129 Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19951129 |
|
| REF | Corresponds to: |
Ref document number: 59204458 Country of ref document: DE Date of ref document: 19960111 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19960220 Year of fee payment: 5 |
|
| EN | Fr: translation not filed | ||
| PLBQ | Unpublished change to opponent data |
Free format text: ORIGINAL CODE: EPIDOS OPPO |
|
| PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
| PLBF | Reply of patent proprietor to notice(s) of opposition |
Free format text: ORIGINAL CODE: EPIDOS OBSO |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19961021 |
|
| 26 | Opposition filed |
Opponent name: SUNDS DEFIBRATOR INDUSTRIES AKTIEBOLAG Effective date: 19960828 |
|
| PLBL | Opposition procedure terminated |
Free format text: ORIGINAL CODE: EPIDOS OPPC |
|
| PLBM | Termination of opposition procedure: date of legal effect published |
Free format text: ORIGINAL CODE: 0009276 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: OPPOSITION PROCEDURE CLOSED |
|
| 27C | Opposition proceedings terminated |
Effective date: 19980726 |