EP0426793B1 - Procede de fabrication d'un produit moule sous pression en resine synthetique, eventuellement en forme de plaque, et preforme a employer pour ce procede - Google Patents

Procede de fabrication d'un produit moule sous pression en resine synthetique, eventuellement en forme de plaque, et preforme a employer pour ce procede Download PDF

Info

Publication number
EP0426793B1
EP0426793B1 EP90906776A EP90906776A EP0426793B1 EP 0426793 B1 EP0426793 B1 EP 0426793B1 EP 90906776 A EP90906776 A EP 90906776A EP 90906776 A EP90906776 A EP 90906776A EP 0426793 B1 EP0426793 B1 EP 0426793B1
Authority
EP
European Patent Office
Prior art keywords
binding agent
weight
binder
compressed
web
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
Application number
EP90906776A
Other languages
German (de)
English (en)
Other versions
EP0426793A1 (fr
Inventor
Fritz Haunold
Gerhard Melcher
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.)
Isovolta AG
Original Assignee
Isovolta Osterreichische Isolierstoffwerke AG
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 Isovolta Osterreichische Isolierstoffwerke AG filed Critical Isovolta Osterreichische Isolierstoffwerke AG
Publication of EP0426793A1 publication Critical patent/EP0426793A1/fr
Application granted granted Critical
Publication of EP0426793B1 publication Critical patent/EP0426793B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/06—Making particle boards or fibreboards, with preformed covering layers, the particles or fibres being compressed with the layers to a board in one single pressing operation

Definitions

  • the invention relates to a method for producing a compression molding, in which a fiber cake is continuously formed from cellulose-containing fibers such as wood fibers and is connected under pressure to a carrier web coated with a binder and is then pressed and cured.
  • a method of the aforementioned type is known from FR-A 1,099184. This describes a process for the production of plates, a carrier material web loaded with a binder being applied to a moist nonwoven fabric with a moisture content of 67% under pressure at elevated temperature.
  • the moist nonwoven fabric is produced by dehydrating a pulp.
  • the pulp contains - as is said on page 2, column 1, lines 24 to 28 - lignin, hemicelluloses and other natural binders which ensure the fibers are connected to one another.
  • the synthetic resin from the binder layer does not penetrate into the fiber pores filled with water due to the high moisture content of the wet nonwoven fabric, so that mainly the paper of the carrier material web is penetrated.
  • EP-B1-81147 relates to a process for producing a decorative building board, in which an aqueous alkaline solution or dispersion of a phenol-formaldehyde resin is applied to wood fibers and the wood fibers resinated in this way are dried to a residual moisture content of 2 to 15% .
  • a fiber mat is then formed from the resinated and dried wood fibers, the mat is mechanically pre-compressed and then hot-pressed in one or more layers arranged one above the other to form a core layer, the decorative layer being applied to the core layer simultaneously with or after pressing .
  • a building board is to be produced which has similar properties to the laminated sheets produced in the usual way, which are produced by hot pressing so-called "prepregs", which are papers impregnated with curable synthetic resins in the dry state.
  • prepregs which are papers impregnated with curable synthetic resins in the dry state.
  • laminated sheets now have due to the preferred orientation of the cellulose fibers of the paper in the paper production direction under fluctuating climatic conditions, a different shrinking and stretching behavior in the longitudinal or transverse direction of the papers used, which can have a disadvantageous effect when used.
  • the paper used is a material that is made from wood as a raw material using a relatively complex and environmentally harmful process.
  • the invention is now based on the object of specifying a method of the type mentioned at the outset, in which one does not require a special process step for resin coating the wood fibers and in which, according to an advantageous variant of the invention, using readily flowable condensation resin binders, the disadvantages mentioned of the known method described above can be avoided.
  • the object on which the invention is based is first achieved in the process according to the invention, which is characterized in that for the continuous production of a pre-compact or a raw plate on a longitudinally moving web-shaped carrier material made of fibrous materials such as papers which are impregnated with curable binders, a layer a liquid binder is applied, that a fiber cake is applied to this binder layer, that a second web-shaped carrier material, to which a further layer of the liquid binder has previously been applied, is applied with the binder layer down onto the fiber cake, so that the layer structure thus formed is continuous compressed to an average average density in the range between 600 and 1400 kg / m3, but advantageously between 800 and 1400 kg / m3 and heated to a higher temperature at which the viscosity of the binder ls is reduced, so that the binder penetrates at least almost completely into the pore volume of the compressed fiber cake and, if appropriate, is subsequently cured.
  • fibrous materials such as paper can advantageously be used as web-
  • the method according to the invention is characterized in that with a moisture content of the fiber mass used of at most 10% by weight, preferably at most 8% by weight, a condensation resin or resin mixture in liquid form is used as the binder for producing the binder layers which has a solid resin content of more than 80% by weight and a water content of at most 8% by weight, preferably at most 6% by weight, and the additives like contains color pigments.
  • the layer structure is largely heated before it is compressed by means of electromagnetic high-frequency heating.
  • the method according to the invention is characterized in that, at or after the end of the heating phase and the compression phase, the layer structure is compressed again briefly and its pore volume is reduced so much that the binder is practically uniformly distributed in the pore volume.
  • This brief compression of the layer structure can advantageously take place in a calender.
  • the method according to the invention is characterized in that the compressed layer structure passes through a cooling section after the end of the heating phase.
  • a device for continuously producing a pre-compact is shown in a schematic representation.
  • This device essentially consists - in the production direction (see arrow) of the manufacturing process one after the other - from a rolling device 1 for a first carrier material web 2, a belt conveyor 3 with a first binder application station 4 and a device 5 for producing and feeding a wood fiber cake, a take-off device 6 for a second carrier material web 7 with a second binder application station 8, a heatable belt press 10, as well as a cooled belt press 11 and a cutting device 12.
  • the invention 5 for producing and feeding a wood fiber cake consists of a wood fiber spreading device 13 with a belt conveyor 14, a compression belt 15, an isotope thickness measuring device 16 and a downstream transfer belt conveyor 17.
  • the carrier material web 2 is continuously drawn off from the unrolling device 1 and runs over a belt conveyor 3.
  • the viscous phenolic resin binder 18 is used to form a binder layer 19 with a thickness of 0 , 5 mm applied.
  • a wood fiber cake 20 is continuously produced, which is placed at 21 on the binder layer 19 applied to the belt conveyor 3.
  • 13 wood fibers in the form of a bed 22 with a bed height of 100 mm and a density of about 30 kg / m3 are scattered with the aid of the scattering device.
  • This bed 22 is then compressed to a thickness of approximately 60 mm by means of the circumferential compression belt 15.
  • the basis weight of the wood fiber cake 20 thus produced is then determined using the isotope thickness measuring device and e.g. kept constant by controlling the spreading device.
  • the second carrier material web 7 is continuously withdrawn from the take-off device 6, which has a supply roll 23, a support plate 24 and a plurality of deflection rollers 25, and when it slides over the support plate 24 from the second binder application station 8 - in an analogous manner to the first carrier material web 2 - provided with a 0.5 mm thick binder layer 26.
  • the carrier material web 7 coated in this way is then continuously pressed onto the wood fiber cake 20 with the binder layer 26 facing downward, so that a layer structure 27 now results, which consists of the wood fiber cake 20 which is provided on both sides by carrier material webs 2 provided with binder layers 19, 26 , 7 is covered.
  • This layer structure 27 now passes through the high-frequency heating device 9, in which it is heated to a temperature of 80-140 ° C. At these temperatures, the viscosity of the binder drops to viscosity values of 100 to 300 mPa.s.
  • the layer structure 27 heated in this way is fed to the entrance of the heated belt press 10 and compressed to a density of approximately 300 kg / m 3 in its feed area.
  • the binder penetrates into the pore volume of the compressed wood fiber cake due to its reduced viscosity due to the heating, with a long residence time in the belt press 10 of 3 min Uniformity of the binder distribution over the pore volume is achieved.
  • the compressed layer structure 27 ' passes through an infrared heating device after leaving the belt press 10 and then through a calender in which the layer structure 27' which has already been compressed is briefly further strongly compacted.
  • the pore volume in the layer structure is reduced to such an extent that it is practically completely filled by the amount of binder and the binder is thereby uniformly wetted the surface of the wood fibers. This can cause any irregularities in the distribution of the binder within the wood fiber mass, which still exist in the layer structure 27 'when leaving the belt press 10, are advantageously further compensated for.
  • the plate-shaped high-pressure molded article removed from the press after cooling and cooled has a bending strength of 140 N / mm2, a tensile strength of 70 N / mm2 and a water absorption of approx. 0.8%.
  • the method described in the figure for the production of a preform, which is used in the production of a plate-shaped high-pressure molded article, can also be used directly with corresponding modifications for the production of high-pressure molded articles.
  • This is then realized, for example, by increasing the pressing pressure in the belt press 10, for example to 70 bar and the pressing temperature to 150 ° C., and extending the dwell time of the layer structure, for example to 6 minutes, so that the synthetic resin binder contained in the layer structure initially flows well and then hardens.
  • a raw plate is then removed from the belt press 10 and is cooled to 30 ° C. in the downstream cooled belt press 11. The raw plate is then cut to length and decorative lacquered or coated for further use in a known manner.
  • the printing moldings produced by the process according to the invention can largely be used in the same field of application as the conventional decorative synthetic resin high-pressure laminates of greater thickness (e.g. between 3 and 15 mm thick), e.g. So for the production of self-supporting components or as weatherproof panels for outdoor use.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Paper (AREA)
  • Printing Methods (AREA)
  • Moulding By Coating Moulds (AREA)

Claims (6)

  1. Procédé de fabrication d'un corps moulé par compression dans lequel un matelas de fibres composé de fibres contenant de la cellulose, telles que des fibres de bois, est formé en continu et est relié sous pression à une bande de support revêtue d'un liant liquide en étant ensuite comprimé et durci, caractérisé en ce que pour la fabrication en continu d'une préforme ou d'une plaque brute, une couche du liant liquide est appliquée sur un matériau de support (2) en forme de bande qui se déplace dans la direction longitudinale et qui est composée de matériaux fibreux tels que des papiers qui sont imprégnés avec des liants susceptibles de durcir, en ce que le matelas de fibres (20) présentant une teneur en humidité maximale de 10% en poids, est appliqué sur cette couche de liant (19), en ce qu'un deuxième matériau de support (7) en forme de bande sur lequel a été appliqué auparavant une autre couche (26) du liant liquide, est appliqué vers le bas sur le matelas de fibres avec la couche de liant (26), en ce que la structure stratifiée (27) ainsi obtenue est comprimée en continu jusqu'à un poids volumique moyen courant compris entre 600 et 1400 Kg/m³, mais de préférence entre 800 et 1400 Kg/m³, et est chauffé à une température plus élevée pour laquelle la viscosité du liant est réduit de sorte que le liant pénètre au moins presque complètement dans le volume des pores du matelas de fibres comprimé et est ensuite durci, et en ce que, lors de la compression le matelas de fibres se trouve relié de façon durable avec le matériau de support en forme de bande, et dans lequel le liant liquide est une résine de condensation ou un mélange de résine de condensation à base de phénoliques et/ou amino et d'aldéhydes, tel que le formaldéhyde qui présente une teneur en résine solide supérieure à 80% en poids et une teneur en eau d'au plus 8%, et de préférence d'au plus 6% en poids.
  2. Procédé selon la revendication 1, caractérisé en ce que pour une teneur en humidité maximale du matelas de fibres utilisé de 10% en poids, de préférence d'au plus 8% en poids, on utilise comme liant pour la fabrication des couches de liants, une résine de condensation ou un mélange de résine de condensation sous forme liquide qui présente une teneur en résine solide supérieure à 80% en poids et une teneur en eau d'au plus 8% en poids , de préférence d'au plus 6% en poids, et qui contient des adjuvants tels que des pigments colorants.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'échauffement de la structure stratifiée (27) est réalisé pour la plus grande partie avant sa compression en utilisant un chauffage électromagnétique à haute fréquence.
  4. Procédé selon l'un des revendications 1 à 3, caractérisé en ce qu'au moins après la fin de la phase de chauffage, la structure stratifiée (27') est comprimée de nouveau pendant une courte période, le volume de ses pores étant ainsi réduit de façon si importante que le liant soit distribué de façon pratiquement uniforme dans le volume des pores.
  5. Procédé selon la revendication 4, caractérisé en ce que la compression de courte durée de la structure stratifiée (27') est réalisée dans une calandre.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la structure stratifiée comprimée (27') parcourt, après la fin de la phase de compression, un trajet de refroidissement.
EP90906776A 1989-05-03 1990-04-27 Procede de fabrication d'un produit moule sous pression en resine synthetique, eventuellement en forme de plaque, et preforme a employer pour ce procede Expired - Lifetime EP0426793B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1061/89 1989-05-03
AT1061/89A AT392758B (de) 1989-05-03 1989-05-03 Verfahren zum herstellen eines gegebenenfalls plattenfoermigen kunstharz-druckformkoerpers sowie vorprodukt zum einsatz bei einem solchen verfahren

Publications (2)

Publication Number Publication Date
EP0426793A1 EP0426793A1 (fr) 1991-05-15
EP0426793B1 true EP0426793B1 (fr) 1993-08-04

Family

ID=3505743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90906776A Expired - Lifetime EP0426793B1 (fr) 1989-05-03 1990-04-27 Procede de fabrication d'un produit moule sous pression en resine synthetique, eventuellement en forme de plaque, et preforme a employer pour ce procede

Country Status (7)

Country Link
EP (1) EP0426793B1 (fr)
JP (1) JPH03506001A (fr)
AT (2) AT392758B (fr)
AU (1) AU632811B2 (fr)
BR (1) BR9006755A (fr)
CA (1) CA2032170A1 (fr)
WO (1) WO1990013403A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT397805B (de) * 1992-03-04 1994-07-25 Isovolta Verfahren zur herstellung eines kunstharz-druckformkörpers
DE69513982T2 (de) * 1994-08-01 2000-05-31 Tarkett Sommer S.A., Nanterre Verfahren zur herstellung eines bodenbelages mit einem holz- oder holzähnlichem zierschicht und die so hergestellten produkte
DE69805317T2 (de) * 1997-10-20 2002-11-28 Syntech Holdings B.V., Venlo Formteil, insbesondere plattenförmiges formteil, welches ein komprimiertes gemisch aus bindemittel und füllstoff enthält, verfahren und vorrichtung zur herstellung solch eines formteils, bodenbelagplatten, sporthalle versehen mit solchen platten, deckenplatten, werbegeschenke, kunstgegenstände und möbelstücke
NL1008899C2 (nl) * 1998-04-16 1999-10-19 Syntech Holdings Bv Vormdeel, in het bijzonder in de vorm van een plaat, dat een samengeperst mengsel van bindmiddel en vulmiddel omvat, werkwijze en inrichting voor het vervaardigen van een dergelijk vormdeel, alsmede vloerplaten, een sporthal voorzien van dergelijke vloerplaten, plafondplaten, relatiegeschenken, kunstvoorwerpen en meubels.
NL1007314C2 (nl) * 1997-10-20 1999-04-21 Syntech Holdings Bv Vormdeel, in het bijzonder in de vorm van een plaat, dat een samengeperst mengsel van polyurethan, bindmiddel en vulmiddel omvat, werkwijze en inrichting voor het vervaardigen van een dergelijk vormdeel, alsmede vloerplaten, een sporthal voorzien van dergelijke vloerplaten, relatiegeschenken en meubels.
CN101758540B (zh) * 2010-01-25 2013-03-20 西北农林科技大学 一种重组材板坯铺装机
PL3181315T3 (pl) * 2015-12-16 2020-11-16 SWISS KRONO Tec AG Sposób produkowania płyty osb z gładką powierzchnią
CN106003275B (zh) * 2016-07-01 2018-01-05 鄂尔多斯市华林沙柳科技有限公司 一种以灌木为原料制造木基型材的自动生产设备及方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831794A (en) * 1958-04-22 Process for manufacturing veneer panels
BE500838A (fr) * 1950-01-27
FR1099184A (fr) * 1953-02-19 1955-08-31 Abitibi Power & Paper Co Planches artificielles
FR1283609A (fr) * 1961-03-13 1962-02-02 Svenska Cellulosa Ab Procédé de préparation d'articles moulés durs ou demi-durs en fibre de bois, et notamment de panneaux en fibre de bois possédant une surface de recouvrement résistante
DE1453390A1 (de) * 1962-05-26 1969-03-06 Holztechnik Anstalt Verfahren zur Oberflaechenveredelung von Pressplatten
DE1653237B1 (de) * 1967-12-23 1971-05-13 Hombak Maschinenfab Kg Verfahren und Vorrichtung zum Kalibrieren und zur gleichzeitigen Quellungsverguetung von Holzwerkstoffplatten
DE1703076A1 (de) * 1968-03-28 1972-01-05 Teutoburger Sperrholzwerk Geor Spanplatte sowie Verfahren zu ihrer Herstellung

Also Published As

Publication number Publication date
JPH03506001A (ja) 1991-12-26
ATE92393T1 (de) 1993-08-15
EP0426793A1 (fr) 1991-05-15
CA2032170A1 (fr) 1990-11-04
AU632811B2 (en) 1993-01-14
AU5550590A (en) 1990-11-29
AT392758B (de) 1991-06-10
WO1990013403A1 (fr) 1990-11-15
ATA106189A (de) 1990-11-15
BR9006755A (pt) 1991-08-06

Similar Documents

Publication Publication Date Title
EP0344231B1 (fr) Procede de fabrication d'un corps en resine synthetique, eventuellement en forme de panneau, moule par compression et produit preliminaire utilise dans ce procede
DE69302484T2 (de) Verbundfilm
DE3147989A1 (de) Dekoratives, insbesondere plattenfoermiges formteil, verfahren zu seiner herstellung und seine verwendung
DE2654981A1 (de) Hartplattenerzeugnis und verfahren und vorrichtung zu seiner herstellung
DE102007015969A1 (de) Verfahren zur Herstellung einer Bauplatte
EP0426793B1 (fr) Procede de fabrication d'un produit moule sous pression en resine synthetique, eventuellement en forme de plaque, et preforme a employer pour ce procede
EP0424909A2 (fr) Procédé pour la fabrication d'objets faÀ§onnés
EP1110687B2 (fr) Procédé de production d'un panneau de fibres léger à surface fermée
EP1691991B1 (fr) Stratifie decoratif et procede de fabrication associe
CH641408A5 (de) Verfahren zur herstellung eines melaminharzbeschichteten papiers.
DE19647240B4 (de) Holzfaserplatte und Verfahren zu ihrer Herstellung
DE2542511C2 (de) Verfahren zum Herstellen einer mehrschichtigen Bahn aus Zellulosematerial
AT397805B (de) Verfahren zur herstellung eines kunstharz-druckformkörpers
EP1185587B1 (fr) Produit semi-fini en fibres de bois et son procede de production
DE10314974A1 (de) Verfahren zur Herstellung von Formkörpern mit einer zusammenhängende lignocellulosehaltige Fasern aufweisenden formgebenden Struktur und Formkörper
DE2434558C3 (de) Verfahren und Einrichtung zum Befeuchten eines Faservlieses
DE2513764B2 (de) Verfahren zum Herstellen einer mindestens einseitig beschichteten Holzwerkstoff-Platte, wie Spanplatte o.dgl
DE2945977A1 (de) Fasermatte zur trockenen herstellung von gepressten formkoerpern aus zellulose- oder lignozellulosefasern
DE2550768C2 (de) Verfahren zur Herstellung einer dekorativen Schichtstoffplatte
DE967962C (de) Verfahren zur Herstellung von Pressschichtkoerpern
DE102008057262A1 (de) Beschichten von Holzwerkstoffplatten mit einer Verschleißschicht
DE884274C (de) Verfahren zur Herstellung von Holzfaserplatten
DE2511262C3 (de) Herstellungsverfahren für mit härtbarem Faser-Kunstharzvorkondensat gefüllten Faserstoffbahnen
DE102020132063A1 (de) Verfahren und Vorrichtung zur Herstellung von Formteilen
EP1059152B1 (fr) Procédé de production d'un article à base de fibres de cellulose, en particulier en forme de panneau de fibres

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

17P Request for examination filed

Effective date: 19901227

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IT LI NL SE

17Q First examination report despatched

Effective date: 19920522

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FR GB IT LI NL SE

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

Ref country code: ES

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

Effective date: 19930804

Ref country code: DK

Effective date: 19930804

REF Corresponds to:

Ref document number: 92393

Country of ref document: AT

Date of ref document: 19930815

Kind code of ref document: T

REF Corresponds to:

Ref document number: 59002191

Country of ref document: DE

Date of ref document: 19930909

ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19931029

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
EAL Se: european patent in force in sweden

Ref document number: 90906776.1

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

Ref country code: GB

Payment date: 19960313

Year of fee payment: 7

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

Ref country code: DE

Payment date: 19960314

Year of fee payment: 7

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

Ref country code: FR

Payment date: 19960318

Year of fee payment: 7

Ref country code: BE

Payment date: 19960318

Year of fee payment: 7

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

Ref country code: CH

Payment date: 19960320

Year of fee payment: 7

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

Ref country code: SE

Payment date: 19960321

Year of fee payment: 7

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

Ref country code: AT

Payment date: 19960322

Year of fee payment: 7

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

Ref country code: NL

Payment date: 19960328

Year of fee payment: 7

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

Ref country code: GB

Effective date: 19970427

Ref country code: AT

Effective date: 19970427

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

Ref country code: SE

Effective date: 19970428

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

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970430

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970430

Ref country code: BE

Effective date: 19970430

BERE Be: lapsed

Owner name: ISOVOLTA OSTERREICHISCHE ISOLIERSTOFFWERKE A.G.

Effective date: 19970430

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

Ref country code: NL

Effective date: 19971101

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970427

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

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971231

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 NON-PAYMENT OF DUE FEES

Effective date: 19980101

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19971101

EUG Se: european patent has lapsed

Ref document number: 90906776.1

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

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 NON-PAYMENT OF DUE FEES;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.

Effective date: 20050427