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时间:2020-06-19
《木粉加工目数与细胞裂解机理的研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第33卷第12期中南林业科技大学学报Vl01.33No.122013年12月JournalofCentralSouthUniversityofForestry&TechnologyDec.2013木粉加工目数与细胞裂解机理的研究杨冬霞,范长胜,杨春梅(1.东北林业大学,黑龙江哈尔滨150040;2.哈尔滨学院,黑龙江哈尔滨150086)摘要:依据木粉的目数和形态将其应用于不同材料领域可产生许多新特性的高附加值产品。在试验过程中以落叶松锯屑为加工原料,根据理论分析和试验结果,确定出了不同目数的木粉与木材细胞裂解间的关系及与加工工艺问的关系。试验结果表明,传统木粉机生产的木粉颗粒主
2、要呈棒状,木屑颗粒的断裂主要是由于加工系统供给的能量大于纤维问的结合力,管胞问发生径向剥离并使颗粒的长径比随着颗粒的径向断裂逐渐减小;超细木粉机提供的能量使纤丝间发生位错产生滑移导致木材细胞横向结构破坏,木粉粒径更小。并将不同目数的木粉与加工时问加工刀具和加工后得到的样品进行分析研究,并对木粉形态和粒径大小进行显微观测为针叶材管胞的破胞和今后纳米木粉的研究提供了意义重大的试验数据和理论支持。关键词:落叶松木粉;木粉形态;木粉加工目数;颗粒长径比;细胞裂解机理中图分类号:$781文献标志码:A文章编号:1673.923X(2013)12.0140—06Studyofwoodpow
3、derprocessingmeshsizeandcelllysismechanismYANGDong-xia。,FANChang—sheng,YANGChun—mei(1.NortheastForestryUniversity,Harbin150040,Heilongjiang,China;2.CollegeofHarbin,Harbin150086,Heilongjiang,China)Abstract:Accordingtowoodpowder’Smeshsizeandmorphology,theyareappliedindiferentmaterialsfieldsand
4、canproducealotofhighvalue—addedproductswithmanynewcharacteristics.Inthecourseoftheexperiments,withlarchsawdustastherawmaterials,basedonthetheoreticalanalysisandexperimentalresults,therelationshipamongthewoodpowderwithdiferentmeshes,thewoodcelllysisandtheprocessingtechnologyweredetermined.The
5、testresultsprovethatthewoodparticlesproducedbytraditionalwoodpowdermachineprimarilyshowedarodshape,thefractureofsawdustparticlesismainlyattributabletotheenergyofprocessingsystemsupplybeingmorethanthebindingforcebetweenfibersandtotheradialseparationamongtracheids,whichmadetheparticleaspectrat
6、iograduallydecreasedwithradialfracture;Theenergythatsuperfinewoodpowdermachineprovidedmadetheinterfibrillartobedislocationandslippageandresultedinthatthelateralstructuredestructionofthewoodcell,thusthewoodpowderparticlesizewassmaller.Therelationsbetweenwoodpowderwithdiferentmeshesandmachinin
7、gtime,machiningtoolandtheprocessedsampleofdifferentmeshsizeofwoodpowderwereanalyzedandthewoodpowd~morphologyandparticlesizewereobservedwithmicroscope.Thisprovidesgreatsignificancetestdataandtheoreticalsupportforsoftwoodtracheids’broken—cellandfutur
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