EP0426793B1 - Verfahren zum herstellen eines gegebenenfalls plattenförmigen kunstharz-druckformkörpers sowie vorprodukt zum einsatz bei einem solchen verfahren - Google Patents

Verfahren zum herstellen eines gegebenenfalls plattenförmigen kunstharz-druckformkörpers sowie vorprodukt zum einsatz bei einem solchen verfahren Download PDF

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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)
French (fr)
Other versions
EP0426793A1 (de
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/de
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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)
EP90906776A 1989-05-03 1990-04-27 Verfahren zum herstellen eines gegebenenfalls plattenförmigen kunstharz-druckformkörpers sowie vorprodukt zum einsatz bei einem solchen verfahren Expired - Lifetime EP0426793B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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
AT1061/89 1989-05-03

Publications (2)

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

Family

ID=3505743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90906776A Expired - Lifetime EP0426793B1 (de) 1989-05-03 1990-04-27 Verfahren zum herstellen eines gegebenenfalls plattenförmigen kunstharz-druckformkörpers sowie vorprodukt zum einsatz bei einem solchen verfahren

Country Status (7)

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

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
CZ26597A3 (en) * 1994-08-01 1997-10-15 Sommer Sa Floor covering and process for producing thereof
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.
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.
AU9652698A (en) * 1997-10-20 1999-05-10 Syntech Holdings B.V. A moulded element, in particular in the shape of a plate, which is a compressed mixture of binder and filler, a method and a device for manufacturing such a moulded element, as well as floor plates, a sports hall provided with such floor
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
ES2806753T3 (es) * 2015-12-16 2021-02-18 SWISS KRONO Tec AG Procedimiento para la fabricación de un panel de OBS con superficie lisa
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 (ja) * 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
CA2032170A1 (en) 1990-11-04
AU5550590A (en) 1990-11-29
AU632811B2 (en) 1993-01-14
EP0426793A1 (de) 1991-05-15
BR9006755A (pt) 1991-08-06
ATA106189A (de) 1990-11-15
AT392758B (de) 1991-06-10
WO1990013403A1 (de) 1990-11-15
ATE92393T1 (de) 1993-08-15
JPH03506001A (ja) 1991-12-26

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