Abstract:
The effects of different compression ratios of the rollerpressing, and different pressure during high frequency hotpressing on the physical and mechanical properties of the reconstituted poplar lumber were studied by impregnating melamineform aldehyde resin into each individual poplar veneer through rollerpressing before lamination and then molding by high frequency hotpressing. The results showed that the high frequency hotpressing could considerably reduce the pressing time, and greatly improve the production efficiency compared to traditional hotpressing base on the molding of thick mat. It was also found that the pressure during hotpressing had significant effect on most physical and mechanical properties of the lumber; however, compression ratio had no significant effect on MOR and MOE of the reconstituted lumber. The performance of the flooring reconstituted lumber could meet the desirable specifications under the condition of 20% compression ratio, under 20MPa pressure during hotpressing, and the corresponding density was 068g/cm3, with MOR as 5019MPa, and MOE as 419161MPa.