Production technology of wood based boards using a non-formaldehyde resin

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To evaluate potential utilization of a PEG based binder to the wood based panel products, laminated veneer board, mat foramolding, particleboard, and strand board were produced using a non-formaldehyde resin, PEG base binder. The results obtained are summarized as follows.Boards could be manufactured using this resin at the temperature beyond 150 ℃, however, complete curing of the resin was obtained over 200 ℃. There was no significant effect of open assembly time after the glue spreading on the mechanical properties of the boards within the range form 30 minutes to 3 months. It was proved that this type of resin had a long pot life.Also laminated veneer board can be produced using this resin.Pressing condition of the molding products was examined. It was found that preferable pre-press temperature was about 80 ℃ and the press time was 4 minutes. The mat can be stored for a long and be handled to the successive process operation. The strength degradation with increasing assembly time could not be found.The manufacturing variables for the mat-formed panel production were determined. High elastic constants were obtained using hinoki strand, which has high quality comparing with sugi. Although, board can be produced at press temperature over 120 ℃, temperature of 150 ℃ or higher than this was preferable for the production. It was found that PEG base binder was appropriate not only for flat type board, but also mold products.