简介：Thegeneralsteam-injectionpressingismainlyusedforproduceparticleboardsandmediumdensityfiberboard.However,itisdifficulttoproducesoftfiberboardwithdesiredstrength.However,theclosingsteam-injectionpressingthatbasedonthesteam-injectionpressingcould.Thewoodenframesealinguptheslabcouldpreventthesteamfromemittingwhenthesteaminjectedintotheslab.Thecaloricreleasedbysteamcondensationmaketheslabreachhightemperaturelevelforashortperiod.Thismethodisveryappropriateformakingthickpanelsintheory,especiallyforthesoftfiberboard.Itmakesagreatleapforwardonthehotpressingprocessthatforwood-basedpanels.Moreover,itwillbeameaningfultechnologicalbreakthroughindevelopingnewproductsandimprovingwoodutilization.

简介：bamboo(Phyllostachysedulis)residuewassubjectedtosteamexplosiontreatmenttoproducesuperiorfibersforbinderlessboards.Then,ligninwasisolatedfromextract-freebamboomeal,steamexplodedpulp,andbinderlessboardswithcharacteristicsbeingdeterminedbythermo-gravimetry(TG),differentialscanningcalorimetry(DSC),andfouriertransforminfraredspectroscopy(FTIR).Resultsshowedthat:1)theyieldoflignindirectlyextractedwithdioxane-waterfromsteamexplodedbamboopulp(SEBPL)andbinderlessboard(SEBBL)washigherthanthatofmilledbamboolignin(MBL).Also,theyieldofSEBBLwaslowerthanthatofSEBPL.2)FTIRresultsshowedcleavageofesterandetherbondsbetweenligninandp-coumaricacidduringsteamexplosiontreatment.3)SEBBLshowedtwoglasstransitionsat115℃and200℃,whileMBLgaveoneglasstransitionsat155℃.And4)themodulusofrupture(MOR)andmodulusofelasticity(MOE)decreasedwithanincreaseinsteamingtime;whereasinternalbonding(IB)increased.InallcasesthedimensionalstabilityofboardsdidnotexceedthemaximumrequirementsfortypeGB/T11718-1999.

简介：该研究采用传统热压和喷蒸热压两种方法来生产杨木刨花板．刨花板内施加１０％的脲醛树脂胶（ＵＦ），目标厚度分别取１０，１５，２０，和２５ｍｍ，热压温度均为１８０℃．喷蒸热压时饱和蒸汽的压力为０．３～０．５ＭＰａ，每种厚度下喷汽时间一定，取两个热压时间；传统热压时每种厚度下各取４个热压时间．然后测定试件的吸水厚度膨胀率、吸水率、密度、含水率及力学性能．本文重点讨论了喷蒸热压对杨木刨花板尺寸稳定性的影响．结论认为：喷蒸热压相对于传统热压，在保证刨花板的强度、缩短热压时间的条件下，明显改善了杨木刨花板的尺寸稳定性．