造纸专业英语5

《造纸专业英语5》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、Lesson14BeatingandrefiningThetermsbeatingandrefiningareoftenusedinterchangeably.Moreprecisely,beatingreferstothemechanicalactionofrotatingbarsopposingastationarybedplateonacirculatingfibersuspensionwheretheindividualfibersareorientedperpendiculartothebars.Thisba

2、tchoperationisexemplifiedinthetraditionalHollanderbeaterwhichisstillusedinsomeolderpapermills,especiallyforhandlingsuchdifficultfurnishersasjute,hemp,flaxandcotton.refine精炼，精制rotatingbar旋转飞刀jute黄麻bedplate底板，底座hemp【植】大麻(纤维)batch一批，一次投料量flax亚麻Lesson14Beatingandref

3、iningRefiningreferstothemechanicalactioncarriedoutincontinuousconicalordisk-typerefinerswherethefibersmoveparalleltothecrossings.Inallcases,theobjectiveistodevelopormodifythepulpfibersinanoptimalmannerforthedemandsoftheparticularpapermakingfurnish.conical锥形的cros

4、sing交叉点Lesson14BeatingandrefiningDuringrefining,bothmechanicalandhydraulicforcesareemployedtoalterthefibercharacteristics.Shearstressesareimposedonthefibersbytherolling,twisting,andtensionalactionsoccurringbetweenthebarsandthegroovesandchannelsoftherefiner.Norma

5、lstressesareimposedbythebending,crushingandpulling/pushingactiononthefiberclumpscaughtbetweenthebar-to-barsurfaces.hydraulic水力的，水压的hydrant消防水龙头roll滚压groove沟纹，凹槽clump丛，块Lesson14BeatingandrefiningTheinitialactionistopartiallyremovetheprimary(P)wall.RemovalofP-laye

6、rexposesthesecondary(S)wallandallowswatertobeabsorbedintothemolecularstructure.Theconsequentlooseningoftheinternalstructure(internalfibrillation)promotesfiberswellingandrendersthefibersoftandflexible.fibrillation细纤维化Lesson14BeatingandrefiningThefurtheractionofex

7、ternalfibrillationinvolveslooseningofthefibrilsandraisingofthefibermicrofibrilsonthesurfaceofthefibers,resultinginaverylargeincreaseinsurfaceareaforthebeatenfibers.Asthefibersbecomemoreflexible,thecellwallscollapseintolumens,thuscreatingribbon-likeelementsofgrea

8、tconformability.collapse倒塌，崩溃conformability一致性Lesson14BeatingandrefiningFibershorteningorcuttingalwaysoccurstosomeextentduringrefining,mainlyduetotheshearingactionoft