EP0426793A1 - 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.

Info

Publication number
EP0426793A1
EP0426793A1 EP90906776A EP90906776A EP0426793A1 EP 0426793 A1 EP0426793 A1 EP 0426793A1 EP 90906776 A EP90906776 A EP 90906776A EP 90906776 A EP90906776 A EP 90906776A EP 0426793 A1 EP0426793 A1 EP 0426793A1
Authority
EP
European Patent Office
Prior art keywords
binder
compressed
layer structure
layer
resin
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
EP90906776A
Other languages
German (de)
English (en)
Other versions
EP0426793B1 (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
Isovolta 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, Isovolta 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

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 process for the production of a synthetic resin compression molding, in which cellulose-containing fibers such as wood fibers and a binder are mixed with a condensation resin or resin mixture based on phenols and / or amino compounds and aldehyde, such as formaldehyde, and optionally together with others Materials such as top layers and / or intermediate layers are hot pressed while the binder is curing.
  • the invention further relates to a preliminary product which is suitable for being used in such a method.
  • a method of the aforementioned type is known from EP 0081147 B1.
  • This patent relates to a method 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 resin-coated 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 at the same time as the pressing or after this .
  • a building board is to be produced which has similar properties to the laminated boards which are produced in the customary manner Hot pressing of so-called "prepregs", which are papers impregnated with curable synthetic resins in a dry state, are produced.
  • pregs papers impregnated with curable synthetic resins in a dry state
  • 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 first of all based on the object of specifying a method of the type mentioned at the beginning, 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 underlying the invention is first in solved the method 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, a layer of a liquid binder is applied that to this fiber mass of cellulose-containing fibers such as wood fibers or bleached pulp of uniform thickness is applied in the form of a bed, a fiber cake or a mat, that if necessary 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 mass, so that the layer structure thus formed continuously an average average density in the range between 600 and 1400 kg / m 3 , but advantageously between 800 and 1400 kg / m 3 , is compressed and heated to a higher temperature at which the viscosity of the binder is reduced so that the binder penetrates at least almost completely into the pore volume of the compressed fiber mass and is subsequently cured if necessary.
  • fibrous materials such as paper
  • 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 surcharge if appropriate contains substances such as 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.
  • the invention further relates to the compressed layer structure produced during the process according to the invention as a preliminary product, which can advantageously be used as a pre-compact in the further process steps for the production of synthetic resin compression molded articles.
  • FIG. 1 in the figure is a schematic representation of a device for the continuous production of a pre-pressed ge shows.
  • 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 device 5 for producing and feeding a wood fiber cake consists of a wood fiber scattering device 13 with a belt conveyor 14, a compression belt 15, an isotope thickness measuring device 16 and a downstream transfer belt conveyor 17.
  • a carrier material consisting of a sodium kraft paper with a weight per unit area of 200 g / m 2 , which is impregnated with 40% resin application - a phenol-formaldehyde resin,
  • a binder consisting of a highly concentrated phenol-formaldehyde resin with a solid resin content of 86% and a water content of 5%.
  • the solid resin content is determined by reweighing after drying in a drying cabinet for 60 min at 130 ° C.
  • the water content of the resin is determined using the known Karl Fischer method.
  • the viscosity of the binder at room temperature is approximately 45,000 mPa.s.
  • the carrier material web 2 is continuously pulled off the unrolling device 1 and runs over a belt conveyor 3. From the first binder application station 4 arranged above the 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 open 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 / m 3 are sprinkled 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 kept constant with the aid of the isotope thickness measuring device and, for example, 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 as 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 radio frequency Heater 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 ' after leaving the belt press 10, passes through an infrared heating device 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 thus uniformly wetted on the surface of the wood fibers. This can cause any unequal moderate 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, can be further compensated in an advantageous manner.
  • the plate-shaped high-pressure molded body which was removed from the press after cooling and cooled down has a flexural strength of 140 N / mm 2 , a tensile strength of 70 N / mm 2 and a water absorption of approximately 0.8%.
  • the method for producing a pre-compact described with reference to the figure, which is used in the production of a plate-shaped high-pressure molded body, can, with corresponding modifications, also be used directly for producing high-pressure molded bodies.
  • 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 molded articles 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)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Printing Methods (AREA)
  • Moulding By Coating Moulds (AREA)
  • Paper (AREA)

Abstract

Dans un procédé de fabrication d'un produit moulé sous pression en résine synthétique constitué de fibres cellulosiques, par exemple de fibres de bois, et d'un liant en résine de condensation comme la résine phénolique, on dépose sur un support en forme de bande (2), en particulier sur un papier imprégné de résine phénolique, pour la fabrication en continu d'une préforme ou d'une plaque brute, une couche (19) de ce liant épais, sur laquelle on applique ensuite une pâte sous la forme d'un gâteau (20). Sur la pâte, on dépose ensuite continuellement une deuxième bande de support (7) revêtue où la couche de liant (26) est agencée vers le bas, puis la structure en couches (27) ainsi produite est chauffée et comprimée dans une presse à ruban chauffée (10) et le liant continue de se répartir régulièrement sur le volume des pores de la structure en couches. Après le refroidissement de la structure en couches comprimée (27'), celle-ci est employée comme ébauche et préforme pour la fabrication de plaques de stratifiés haute pression. Selon une autre variante du procédé, la structure en couches peut aussi être transformée directement, avec durcissement du liant, en un produit moulé sous pression en résine synthétique si l'on augmente la pression, la température de moulage et le temps passé dans la presse.
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
AT1061/89A 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 true EP0426793A1 (fr) 1991-05-15
EP0426793B1 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
EP0773857B1 (fr) * 1994-08-01 1999-12-15 Tarkett Sommer S.A. Procede de fabrication d'un revetement de sol a parement bois naturel ou synthetique, et produits obtenus
CN1136084C (zh) * 1997-10-20 2004-01-28 合成技术控股有限公司 一种模制件及其制造方法
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
HUE050762T2 (hu) * 2015-12-16 2021-01-28 SWISS KRONO Tec AG Eljárás egy sima felületû OSB lemez elõállítására
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9013403A1 *

Also Published As

Publication number Publication date
AU632811B2 (en) 1993-01-14
WO1990013403A1 (fr) 1990-11-15
CA2032170A1 (fr) 1990-11-04
AU5550590A (en) 1990-11-29
BR9006755A (pt) 1991-08-06
JPH03506001A (ja) 1991-12-26
EP0426793B1 (fr) 1993-08-04
ATE92393T1 (de) 1993-08-15
ATA106189A (de) 1990-11-15
AT392758B (de) 1991-06-10

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