EP0590433A2 - Procédé de commande pour diriger la production de pâte à papier à travers le contrôle de pression et température - Google Patents

Procédé de commande pour diriger la production de pâte à papier à travers le contrôle de pression et température Download PDF

Info

Publication number
EP0590433A2
EP0590433A2 EP93114964A EP93114964A EP0590433A2 EP 0590433 A2 EP0590433 A2 EP 0590433A2 EP 93114964 A EP93114964 A EP 93114964A EP 93114964 A EP93114964 A EP 93114964A EP 0590433 A2 EP0590433 A2 EP 0590433A2
Authority
EP
European Patent Office
Prior art keywords
cooking
pressure
phase
pulp
finished
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
Application number
EP93114964A
Other languages
German (de)
English (en)
Other versions
EP0590433B1 (fr
EP0590433A3 (en
Inventor
Herbert Dr. Furumoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0590433A2 publication Critical patent/EP0590433A2/fr
Publication of EP0590433A3 publication Critical patent/EP0590433A3/de
Application granted granted Critical
Publication of EP0590433B1 publication Critical patent/EP0590433B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/228—Automation of the pulping processes
    • 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
    • D21C7/00—Digesters
    • D21C7/12—Devices for regulating or controlling

Definitions

  • the invention relates to a method for controlling the cooking of a suspension of wood pulp and cooking liquid in a plant for the production of cellulose.
  • the invention further relates to an advantageous device for performing the method.
  • the process of pulping pulp in pulp is generally called "boiling".
  • the course of this process engineering process can essentially be divided into two phases.
  • the suspension In the first phase of cooking, the suspension is e.g. gradually heated up at ambient temperature.
  • the so-called “ready-to-cook temperature” When the so-called “ready-to-cook temperature” is reached, the second phase of cooking begins. Both phases are approximately marked in FIG. 1 with the periods T1, T2.
  • the aim of cooking is to completely remove the so-called "lignin” from wood fibers in order to form pulp by the action of a cooking liquid containing chemical reactants, but also to leave the fiber structure intact as far as possible.
  • the carbohydrates in the cellulose fibers are attacked. This is undesirable because it causes embrittlement of the fibers.
  • This "overcooking" of the wood material reduces the quality of the usable cellulose, since its tensile strength and fiber length decrease (“boiling").
  • the cooking of, for example, a batch of pulp in a discontinuously operated plant for pulp production would have to be stopped at the moment when the lignin is almost completely dissolved out, but beyond that no carbohydrate degradation has started. In practice, of course, this is not possible because, due to the high temperatures and pressures inside the cellulose manufacturing plant, the process sequence cannot be brought to a sudden stop.
  • the diagram in FIG. 2 shows the time course of the yield A and the tensile strength R of the pulp essentially in the second phase of the boil T2 and the subsequent area of the overboil, for example for a smaller value TM1 in a solid line and for a larger value TM2 of the finished cooking temperature TM in dashed line.
  • the "yield” is the mass of the finished pulp produced based on the mass of the wood introduced.
  • the tensile strength R (t) of the pulp e.g. for the smaller value TM1, increasing values only start from time t0.
  • the time course of the tensile strength R (t) of the pulp has a maximum at point t2, and decreases with the yield as the cooking time increases.
  • Areas of optimal cooking or undesired areas of "overcooking” can thus be taken from the diagram. For example, at time t1 the boiling is in a phase in which a high yield A (t1) of pulp is present small or medium tensile strength R (t1). If the current production conditions require the production of a large yield of cellulose, the cooking should be stopped at time t1 if possible. If, on the other hand, the boiling is not stopped, the tensile strength of the pulp increases at the expense of the achievable tensile strength.
  • the boil is in a phase in which the achievable yield A (t2) of finished pulp has decreased, but this has a very high value of tensile strength R (t2), ie has a high "quality” .
  • the second phase T2 of the boiling should be terminated if possible at time t2.
  • the process increasingly gets into the undesirable area of "overboiling", in which both the yield A (t) and the tensile strength R (t) decrease.
  • the pulp has a value R (t3) of tensile strength which corresponds to the tensile strength R (t1) at time t1, but the yield A (t3) of finished pulp compared to the previous time t1 is in the optimal cooking range and the high value of yield A (t1) there decreased considerably.
  • the cooking would have to be abruptly interrupted at the associated time depending on the respective production target, for example in FIG. 2 at time t1 when a high cellulose yield is required or at time t2 when a high tensile strength of the finished cellulose is required.
  • the plant for pulp production can only be shut down gradually from an end time by reducing the high cooking temperature and the internal pressure.
  • the cooking liquid continues to act on the cellulose fibers and shifts the operating points explained in principle with reference to FIG. 2 in the direction of the "overcooking" area.
  • a noticeable loss in the yield of finished pulp and, if appropriate, additionally in the tensile strength of the finished pulp may occur.
  • the invention has for its object to provide a control method with which the "controllability" of the process engineering Process of cooking a suspension of wood pulp and cooking liquid to pulp is improved, and thus the optimal termination time of the cooking described above can be determined more precisely with regard to the precise achievement of predetermined values in terms of yield and, if appropriate, the tensile strength of the finished pulp.
  • the suspension of wood pulp and cooking liquid in the first phase T1 of the cooking is exposed to a pressure as high as possible during the heating.
  • This pressure is also called “impregnation pressure”.
  • the value of the pressure is reduced for the second phase T2 of cooking the suspension at the final cooking temperature. This is also called “cooking pressure”.
  • This pressure curve p (t) according to the invention is shown in FIG.
  • the "impregnation pressure" p (T1) in the first phase T1 of the boiling has a very high value of 10 bar, for example.
  • the value of the pressure on the so-called “cooking pressure” is shown in the example in FIG "p (T2) lowered by example from 6 bar.
  • the invention In contrast to maintaining the cooking pressure constant over the entire cooking period, i.e. for the sum of the two phases p1 and p2, the invention teaches the specification of a "pressure profile". This can particularly advantageously achieve a homogenization of the achievable product quality and thus an improvement in the controllability of the process. This is due to the fact that the high value of the pressure in the first phase of heating the suspension makes the starting conditions more reproducible for the beginning of the second phase T2 of the boiling, i.e. the so-called main cooking phase can be achieved.
  • the accuracy in the prediction of the properties of the finished pulp that can be achieved at the end of the boil is greater, so that the ideal time for stopping the boil can be extrapolated more accurately, and after the boiling temperature and the pressure have been reduced to ambient conditions, the present quality of the finished pulp and possibly also the Tear strength deviate less from specified target values.
  • the specification of the "pressure profile" according to the invention essentially benefits the improvement of a precise achievement of a desired target value for the tensile strength of the finished pulp. It can therefore be the same Overall yield of finished pulp an increase in the tensile strength of the finished pulp can be achieved.
  • the value of the pressure in the first phase T1 of the boiling is not subject to any technological limitation in the process-related process of the cellulose boiling, it can be chosen to be as high as possible. This "impregnation pressure value" is therefore only limited by the mechanical engineering design of the production system.
  • the pressure in the first phase of the boil can preferably be increased to the maximum permissible operating pressure of the system.
  • the operating pressure is designed in such a way that no damage occurs in the piping system of the system and especially in the case of seals in pipeline flanges as the weakest elements of the system.
  • the reduced value of the "cooking pressure" in the second phase of the cooking can be predetermined as a function of a predetermined target value for the tensile strength of the finished pulp.
  • a "pressure profile” thus has the effect that, in the first phase of the cooking, the pressure acts as the dominant process variable.
  • the cooking temperature which is only rising, is of minor importance as a process variable.
  • optimal starting conditions are provided for the actual main cooking at the finished cooking temperature.
  • the pressure as the main process control variable returns. Instead, the temperature of the suspension takes over the function of the main controlled variable.
  • a possible optimal pressure curve p (t) is given using the example of the production of pulp by the so-called "sulfite process". While previously the cooking pressure was kept approximately constant over the entire course of the process at values of approx. 6 to 8 bar, according to the invention the pressure in the first phase of the cooking has an upper value and in the second phase a lower value.
  • the "impregnation pressure" in the first phase T1 of the boil is in the range from 9 to 12 bar
  • the "boiling pressure” in the second phase T2 of the boil in the range from 5 to 7 bar.
  • the pressure reduction from the high value p (T1) in the first phase to the lowered value p (T2) in the second phase should be at least 2 bar.
  • the "impregnation pressure” has a value of 10 bar and the lowered “cooking pressure” has a value of 6 bar.
  • the values of the pressure p (T1), p (T2) in the first and / or second phase of the cooking T1, T2 become the suspension reverse direction of action changed. If the concentration increases or decreases, the pressure values are questionably reduced or increased.
  • an "impregnation pressure value" below the maximum permissible operating pressure of the cellulose cooking plant may be sufficient in the first phase of the cooking.
  • the pressure is preferably 20 to 30% less than the maximum permissible operating pressure.
  • the value of the "cooking pressure” is preferably also reduced in the second phase of the boiling to a value in the range of the lower limit of the permissible pressure range.
  • these measures mean that the risk of “overcooking” in the second phase is reduced due to too intensive impregnation in the first phase of the cooking.
  • the point in time of lowering the pressure between the first and the second phase of the boiling is advanced or postponed if the tensile strength R of the finished pulp is to assume a higher or lower value at the end of the boiling.
  • the switchover time between the two must be made Pressure levels, ie the point in time of the pressure drop, are brought forward. This may sometimes be necessary due to the current production constraints, although this measure impairs the yield that can be achieved. Because of the less intensive impregnation in the first phase T1, only less pulp can be produced which has the desired high level of tear resistance.
  • the pressure is preferably reduced when the desired value of the finished cooking temperature is reached. If necessary, the pressure drop can also be waited until the main cooking process has started at the beginning of the second phase. In this case, the pressure is preferably reduced 30% after the period between the expected reaching of the finished cooking temperature and the end of the cooking.
  • the finished cooking temperature T (T2) is limited in the second phase 12 of the cooking if, due to the present process conditions, the expected yield of finished pulp decreases with a desired value of tensile strength.
  • the measure according to the invention of limiting the cooking pressure in the second phase of the cooking thus further improves the "controllability" of the process with the aim of maintaining a desired high yield of pulp with a predetermined value of tensile strength. Due to the reduced cooking pressure in the second phase, the chemical reactants in the cooking liquid only act on the cellulose fibers in a braked manner anyway. In addition, if the finished cooking temperature is also limited, particularly when there is a risk of "overcooking" of the pulp by boiling, it is easier to produce a finished pulp e.g. with a defined residual lignin concentration or tensile strength.
  • the cooking temperature can preferably be limited in two different ways.
  • the maximum permissible value Tmax of the final cooking temperature T (T2) can be reduced for the entire second phase T2 of the cooking. This is particularly advantageous if the value of the "cooking pressure" at the beginning of the second phase is at the upper limit of the permissible value range due to the existing process boundary conditions. Limiting the maximum permissible value of the cooking temperature favors "controllability" of the system and thus reduces the risk of missing the desired yield and possibly tear strength in the finished pulp at the end of cooking.
  • the final cooking temperature can also be limited by lowering the target value for the final cooking temperature in the second phase T2.
  • the setpoint is preferably lowered towards the end of cooking or in the last third of the second phase T2. This is shown in the example in FIG. 1.
  • the dashed line reduces the cooking temperature from approx. 130 ° C to approx. 120 ° C. Accordingly, e.g. in the pulp production according to the "sulfite process" the temperature reduction preferably has a value of 5 to 10 ° C.
  • the measures according to the invention of reducing the pressure at the beginning of the second cooking phase and any additional temperature limitation in the second cooking phase increase the controllability of the process by harmonizing it. It is thus possible, by specifying a point in time at which the termination is to be carried out, with greater accuracy, to produce a desired value of finished pulp having a tensile strength with the greatest possible yield.
  • a particularly advantageous device for carrying out the method according to the invention has a program-controlled computer, in particular a so-called programmable logic controller, an automation system or a process computer.
  • This contains a program for controlling the Cooking, with at least one fuzzy controller to control the pressure p (t) and, if necessary, the finished cooking temperature.
  • a fuzzy controller that is preferably implemented in terms of program technology is to be used to carry out the The method according to the invention for controlling the cooking of a suspension of wood pulp and cooking liquid in a plant for the production of cellulose is particularly suitable.
  • Setpoints for the tensile strength and yield of the finished pulp, and actual values for the current wood quality and the concentrations of the chemical reactants in the cooking liquid are preferably specified as input values for such a fuzzy controller.
  • the actual values of the tensile strength and yield that occurred at the end of the previous batch of pulp can also be fed as input quantities to the fuzzy controller.
  • an exemplary set of input variables is preferred for a fuzzy controller for guidance depicted in a batch operated plant.
  • the supplement (s) identifies actual values that were entered at the start of processing the current batch. This applies in particular to the wood quality Q and the concentrations 1,2 of two chemical reaction substances in the cooking liquid, for example. If necessary, a change value ⁇ Q of the wood quality can also be added as an input variable.
  • the addition (n-1) indicates that this actual value is a result of the cooking of a previous batch. This applies in particular to the tensile strength R, the achievable yield B and the reject A that occurs. In these cases, too, change values ⁇ R, ⁇ B, ⁇ A can additionally be supplied as input variables.
  • the fuzzy controller outputs at least manipulated variables for the "impregnation pressure" p (T1) in the first phase of the boiling, for the “cooking pressure” p (T2) in the second phase of the boiling, and preferably for the maximum permissible final cooking temperature TM (T2 ) in front.
  • the program for controlling the cooking in the device for carrying out the method additionally contains a “neural network” NZ for guiding the pressure and, if appropriate, the finished cooking temperature in the plant for pulp production.
  • NZ a “neural network” for guiding the pressure and, if appropriate, the finished cooking temperature in the plant for pulp production.
  • the system is managed by the fuzzy controller.
  • the neural network is supplied with the same input variables, but runs in parallel for the duration of its adaptation without being connected to the system. Only after the adaptation of the neural network has been completed does it take over the management of the system instead of the fuzzy controller.
  • FIG. 3 depicts a neural network NZ which is supplied with the set of input variables already described above.
  • the rough structure of the neural network is adequate for the structure of the fuzzy controller. This manifests itself at least in a matching set of input and output variables.
  • a neural network has a large number of so-called “neurons” which are grouped together.
  • a neuron from the set of input neurode EN is assigned to each input variable.
  • the set of output neurons AN each has a neuron for delivering an output variable.
  • the neurons of the network are interconnected via a large number of connections, which are rated with so-called "weights".
  • weights As part of the "adaptation" of the network, the structure of these connections and the values of the "weights" per connection are determined as part of a regression calculation depending on the current values of the respective input variables. Only after this adaptation has been completed can the neural network map the set of input variables into the set of output variables.
  • the neural network must be supplied with current input variables for a certain time at least once after the commissioning of the cellulose production plant in order to go through the adaptation. It runs parallel to the fuzzy controller in the so-called "off-line” mode. Only after the adaptation has been completed, ie after determining the "weights" for each new neuron connection, can the neural network replace the fuzzy controller and the process control of the Take over plant for pulp production.
  • the adaptation of the neural network is constantly in operation and for this purpose at least the actual values of the tensile strength and yield of the finished pulp are continuously fed back as input variables.
  • a neural network is particularly well suited for carrying out the method according to the invention.

Landscapes

  • Paper (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
EP93114964A 1992-10-02 1993-09-16 Procédé de commande pour diriger la production de pâte à papier à travers le contrÔle de pression et température Expired - Lifetime EP0590433B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4233264 1992-10-02
DE4233264 1992-10-02

Publications (3)

Publication Number Publication Date
EP0590433A2 true EP0590433A2 (fr) 1994-04-06
EP0590433A3 EP0590433A3 (en) 1996-09-25
EP0590433B1 EP0590433B1 (fr) 1999-08-25

Family

ID=6469541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93114964A Expired - Lifetime EP0590433B1 (fr) 1992-10-02 1993-09-16 Procédé de commande pour diriger la production de pâte à papier à travers le contrÔle de pression et température

Country Status (4)

Country Link
EP (1) EP0590433B1 (fr)
AT (1) ATE183786T1 (fr)
DE (1) DE59309744D1 (fr)
FI (1) FI934316A7 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996018135A1 (fr) * 1994-12-05 1996-06-13 Siemens Aktiengesellschaft Procede d'exploitation de reseaux neuronaux dans des installations industrielles et reseau neuronal associe
DE19510008A1 (de) * 1995-03-23 1996-09-26 Siemens Ag Verfahren und Vorrichtung zur Prozeßführung bei der Zellstoff- und/oder Papierherstellung
WO1997013916A3 (fr) * 1995-10-09 1997-07-17 Siemens Ag Procede pour determiner la fin de cuisson de la cellulose et dispositif pour commander le temps de cuisson lors de la cuisson dans un reacteur
WO1999028548A1 (fr) * 1997-11-26 1999-06-10 Siemens Aktiengesellschaft Dispositif de commande pour lessiveur fonctionnant en continu pour la production de cellulose
DE19752442A1 (de) * 1997-11-26 1999-08-26 Siemens Ag Steuereinrichtung für einen kontinuierlich arbeitenden Kocher zur Herstellung von Zellstoff

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1325110A1 (ru) * 1985-12-23 1987-07-23 Марийский филиал Всесоюзного научно-исследовательского института бумаги Способ получени целлюлозы
JPH07109074B2 (ja) * 1989-10-31 1995-11-22 横河電機株式会社 抄紙機制御装置及びその制御方法
DE9017325U1 (de) * 1990-12-21 1992-01-02 Siemens AG, 8000 München Prozeßleitsystem zur Steuerung der Herstellung von Zellstoff

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996018135A1 (fr) * 1994-12-05 1996-06-13 Siemens Aktiengesellschaft Procede d'exploitation de reseaux neuronaux dans des installations industrielles et reseau neuronal associe
DE19510008A1 (de) * 1995-03-23 1996-09-26 Siemens Ag Verfahren und Vorrichtung zur Prozeßführung bei der Zellstoff- und/oder Papierherstellung
US6398914B1 (en) 1995-03-23 2002-06-04 Siemens Aktiengesellschaft Method and device for process control in cellulose and paper manufacture
WO1997013916A3 (fr) * 1995-10-09 1997-07-17 Siemens Ag Procede pour determiner la fin de cuisson de la cellulose et dispositif pour commander le temps de cuisson lors de la cuisson dans un reacteur
WO1999028548A1 (fr) * 1997-11-26 1999-06-10 Siemens Aktiengesellschaft Dispositif de commande pour lessiveur fonctionnant en continu pour la production de cellulose
DE19752442A1 (de) * 1997-11-26 1999-08-26 Siemens Ag Steuereinrichtung für einen kontinuierlich arbeitenden Kocher zur Herstellung von Zellstoff
DE19752442C2 (de) * 1997-11-26 2000-05-25 Siemens Ag Steuereinrichtung für einen kontinuierlich arbeitenden Kocher zur Herstellung von Zellstoff

Also Published As

Publication number Publication date
EP0590433B1 (fr) 1999-08-25
FI934316A7 (fi) 1994-04-03
DE59309744D1 (de) 1999-09-30
ATE183786T1 (de) 1999-09-15
FI934316A0 (fi) 1993-10-01
EP0590433A3 (en) 1996-09-25

Similar Documents

Publication Publication Date Title
DE3631164C2 (fr)
DE3530905C2 (fr)
EP3260584B1 (fr) Procédé destiné à optimiser la production d'une machine à filer à bout libre
DE10241742A1 (de) Fertigungsanlage zum Herstellen von Produkten
DE3018373A1 (de) Verfahren zum schaeren von kettfaeden fuer web- und wirkmaschinen sowie schaeranlage zur durchfuehrung des verfahrens
EP0590433A2 (fr) Procédé de commande pour diriger la production de pâte à papier à travers le contrôle de pression et température
DE2363270A1 (de) Verfahren und vorrichtung zur regelung eines dampferzeugers
EP0729822A1 (fr) Méthode de contrÔle de machines à extruder
EP0590430B1 (fr) Dispositif pour la commande automatique d'une installation de traitement basée sur la logique floue et ayant des applications préférées
EP1490735B1 (fr) Procede et regulateur permettant la regulation adaptative d'au moins une composante d'une installation technique
DE112012000701T5 (de) Automatische Drahtverbindungsvorrichtung
WO2021073997A1 (fr) Procédé de surveillance d'au moins une partie d'un processus de production d'un système d'extrusion de film
DE2908773A1 (de) Verfahren und vorrichtung zur herstellung eines fuelligen texturierten garns
WO2016128517A1 (fr) Procédé de démarrage pour un métier mécanique
EP0898013A2 (fr) Appareil pour controler et règler le profile d'une propriété d'une bande
DE10222662A1 (de) Verfahren zum Überwachen von Betriebsdaten einer Spritzgussmaschine
EP3877143B1 (fr) Dispositif d'actionnement et procédé pour commander l'épaisseur d'un espace de sortie de buse d'une machine à film plat
DE10219844C1 (de) Verfahren zur Heissdispergierung eines Papierfaserstoffes
EP3511564B1 (fr) Procédé et système de commande d'une éolienne
WO2022002652A1 (fr) Procédé de réglage d'un système de régulation, procédé d'entraînement, programme informatique, support d'enregistrement et unité de commande
EP0027575B1 (fr) Dispositif pour régler la capacité de production d'une extrudeuse
WO2020094652A1 (fr) Dispositif d'inversion et procédé pour faire passer une machine de production de feuilles plates d'un produit de base à un produit secondaire
EP1001320A1 (fr) Procédé pour l' identification d' un processus avec retard utilisant une compensation et dispositif pour la commande d' un tel processus
EP4249676B1 (fr) Installation et procédé de transfert de chaleur
DE10219843C1 (de) Verfahren zur Dispergierung eines Papierfaserstoffes

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): AT DE ES GB PT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT DE ES GB PT SE

17P Request for examination filed

Effective date: 19961104

17Q First examination report despatched

Effective date: 19971006

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE ES GB PT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19990825

Ref country code: GB

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19990825

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19990825

REF Corresponds to:

Ref document number: 183786

Country of ref document: AT

Date of ref document: 19990915

Kind code of ref document: T

REF Corresponds to:

Ref document number: 59309744

Country of ref document: DE

Date of ref document: 19990930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19991125

GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19990825

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20121119

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20120810

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 59309744

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20130917

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK07

Ref document number: 183786

Country of ref document: AT

Kind code of ref document: T

Effective date: 20130916