Eigenschaften formaldehydarm verleimter Sperrhölzer

Tests were carried out on both industrial plywood with low content of formaldehyde and laboratory plywood. There were eight series plywood from different industrial manufactures including blockboard and a blockboard with particleboard decks. Twelve lab-series (5×1.5 BU) were produced of different formulae by the technical department of WKI. Bending and bonding properties as well as formaldehyde emissions of plywood were determined. Creep behaviour of plywood will be described in part 2. Plywood showed good bending characteristics dependent on its structure. Bonding strength after tensile and shear tests as well as after prick test complied with IF bonding quality even after alternating climatic storages. The different series, however, differ widely with respect to IW bonding quality. The different potential of formaldehyde emissions of the series was determined according to various methods, correlations between the methods could be proved. The test, however, revealed the difficulties caused by the material to measure formaldehyde emission of plywood.