Basf Se Corporation

Institut Für Holztechnologie Dresden Gemeinnützige Gmbh

Marco Mäbert

Stephan Weinkötz

Detlef Krug

Ingolf Hennig

Matthias Schade

Werner Teufel

The invention relates to a method for producing multi-layered lignocellulose materials having a core and an upper and a lower cover layer, said method comprising the following steps a) mixing the components, b) spreading the mixtures in layers, c) pre-compressing, d) applying a high-frequency electric field e) hot pressing. According to the invention, a mixture of C) 1-15 wt.-% of a binding agent selected from the group consisting of aminoplastic resin and organic isocyanate having at least two isocyanate groups [components C)], F) 0.1-3% alkali-/akaline earth salts, for the cover layers of the lignocellulose particles G) with H) 1-15% of a binding agent selected from the group consisting of aminoplastic resin and an organic isocyanate is mixed. After step a) the mixture for the core contains, with respect to the total dry weight of the mixture of the components A)-F) 3-15% water, the mixture for the cover layers of the components G)-K) contains 5-20% water, and the following conditions are met: F)&#x2265;1,1&#x2022;components K) and [components F)+components D)]&#x2265;1,1&#x2022;[components K)+components I)].

Method for producing multi-layered lignocellulose materials having a core with special properties and at least one upper and one lower cover layer

The present invention relates to a process for the batchwise or continuous, preferably continuous production of single-layer lignocellulose-based boards or of multilayer lignocellulose-based boards with a core and with at least one upper and one lower outer layer, comprising the following steps: 

Method for producing single or multi-layered lignocellulose materials by hardening in a high frequency electric field

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Klipphausen, Germany

Marco Mäbert