摘要:Methods to maximize wood hardness and dimensional stability includes chemical modification,compression and heating treatment.In this study,poplar wood( Populus ussuriensis )was treated with different concentrations of a melamine formaldehyde resin,which was low molecular weight and water soluble,and then compressed while being heated.The results showed 47 per cent of antishrink efficiency( ASE) .And the wood specimen were able to retain almost complete fixation when treated with 10 per cent of resin solution and then soaked in room temperature water and treated with 17 5 and 25 per cent of resin solution and then soaked in boiling water.
摘要:Manchurian ash (Fraxinus mandshurica) is one of the most valuable hardwood species for making high quality wood interior decoration products in China,such as parquet floor.But it is usually difficult to control the drying quality and to improve the drying productivity by using conventional drying technology due to its drying characteristics.This paper described a patented technology for drying Manchurian ash parquet floor blank.The blank was dried in a fire tube drying kiln with continuously rising temperature schedule.The test results showed that the drying speed was quick,the dried blank′s quality was good and the drying schedule was easily operated.
摘要:The paper studied the reaction mechanism of self bonding in dry process binderless fiberboard manufacture by investigating the chemical composition and conversion of wood.The results showed that:1 both cellulose and hemicellulose were partly hydrolyzed into monosaccharide and oligosaccharide during defiberizing and hot pressing process,and the resulted substances could be converted into furnan products.2 the degraded lignin by thermal conversion could bond with furnan products to form resins.
关键词:Dry process binderless fiberboard;Furnan products
摘要:This paper described technology of making sunflower stem particleboard and overlaid with low pressure melamine(LPM) impregnated paper on the board in home made production line.The results showed that properties of both the substrate particleboard and the overlaid one were able to meet the requirement of GB/T 4 897-92 and GB/T 15 102-94,respectively,when production technology was adjusted and UF resin and MF resin modified,accordingly.