Alternative Rye-based Binders for the Manufacture of Wood-based Panels
: 20 - 28
Raw wood, and the semi-finished products made from it, have - over the past twenty years and especially in the construc- tion industry under an ecological and economic aspect - experienced a tremendous enhancement of status. Increasing environmental awareness has supported the tendency towards the use of natural binders in wood-based materials, which are derived from renewable raw materials. The IARC assessment of June 2004 regarding formaldehyde as being "cancer-indu- cing" has additionally boosted this development. The rye flours that were drychemically modified by the Ceresan Erfurt GmbH formed the starting point for the development of binding agent formulations. At the Kunststoff-Zentrum Leipzig gGmbH (KuZ), these rye flours were, by means of processing agents, further prepared in a twin screw extruder, granulated and eventually ground after cooling. The powders so obtained were used at the Institut für Holztechnologie Dresden gGmbH (ihd), proportionately substituting synthetic adhesives, in the manufacture of wood-based panels. Regarding their physical-mecha- nical properties, the manufactured boards met the normative requirements to particleboards acc. to DIN EN 312 as well as to MDF acc. to DIN EN 622-5.