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Tạp chí NN & PT
Tạp chí tiếng anh
Bài báo - Tạp chí
Số tạp chí 6 - Năm 2017(2017) Trang: 8-15
Tải về

Rotary cut Beech (Fagus sylvatica. L) veneers with dimension of 1.5 × 400 × 400 mm3 (rad × tang × long) were impregnated with three chemicals: N-methylol melamine (NMM-1 - 10% solid content), fatty acid modified N-methylol melamine/paraffin compound (mNMM-2 - 5% solid content), alkyl ketene dimer (AKD - 1% solid content). The impregnated veneers were pre-dried in a drying-oven at 40°C, 24 h to a moisture content of 38% before glue spreading. An amount of 160 g m-2 PF glue was applied per veneer. Afterwards, 5-layer-plywood was produced in a hot press (130°C) at 1.5 MPa (10 min pressing time). The resistance against white rot fungus (Pleurotus ostreatus) and brown rot fungus (Coniophora puteana) of the plywood was performed according to the ENV 12038. The plywood treated with 10% solid content of NMM-1 solution disclosed high protection to the brown rot fungus C. puteana and the white rot fungus P. ostreatus. While the treatment of veneers with 5% mNMM-2 and catalyst RB (an aluminium salt) imparted medium resistance to plywood against P. ostreatus and no resistance to C. puteana. The veneer treatment with 1% solid content of AKD totally failed to protect plywood from the brown rot fungus C. puteana and the white rot fungus P. ostreatus after 16 weeks of incubation.

 

 
 
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