制革概论第二章(英文版)

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1、Chapter2ModernBeamhouseProcedures-soaking,unhairingandLiming2.1Soaking1.Thepurposesofsoaking2.Soakingprocess:saltedhides,freshhidesanddriedhides3.Checkingtheendofsoaking2.2Unhairing1.Unhairing(1)HAIR-SAVING-unhairingsystem1-1Sodiumsulfidepaintingsystem1-2Enzymaticunhairingsystema.Enzy

2、maticpaintingsystemb.Enzymaticdrumsystem(2)HAIR-BURNING-unhairingsystem2.3LimingThepurposesoflimingLimingoperationsCheckingtheendofLimingprocessThehistoryofbeamhouseBeam:Thetermdatesbacktothetimewhenthehairwasremovedfromtheskinsbymeansofahandbeamusingatwo-handledknife.Somehandworkonthe

3、beamisneededoccasionallyforqualityimprovement.Suchasscud.BeamBeamhouseReferstotheprocessinthetannerybetweentheremovaloftheskinsorhidesfromstorageandtheirpreparationfortanning.Intheopinionofmostpracticaltanners:Leatherismadeinthebeamhousebeamhouse2.1SoakingThefirstandthemostimportantst

4、eps1.ThepurposeofsoakingRehydrationofthehideHidesandskins,whenreceivedbythetannery,areinaconditionofpreservationbasedondehydration.Theskinsmustbewetbackandbroughttoaflaccidconditionforsubsequentoperations.Removalof:a.preservingsaltsb.dirtandbloodc.unstructuredproteinsandproteoglycansLo

5、osenof:a.epidermalstructuresb.subcutisOpeningupthefibresPreparationofthehideforthesubsequentprocess2.ConditionsofsoakingDisinfectantsThebacteriaonhidesmaybedangeroustoman,andbacterialdamagetothehidesmayoccur.Chlorinatedaromaticcompoundsmayusuallybeused.Infectiousanimaldiseases:AnthraxH

6、oofandmouthdisease(2)TemperatureCommon,usually25-28℃.Thetemperatureofsoakingisdifferentfromthedifferentseasons,theareas(Suchasinwinter,insummer,thesouthern,thenorthernandsoon).AdditivesToacceleratethesoakingprocessSodiumsulfideorsodiumtetrasulfideAddasmallquantityofsodiumsulfideorsodiu

7、mtetrasulfidetothesoakmayresultinchemicalactiononkeratininthefollicle,removalofsoftglobularproteins.SaltorappropriatealkaliSaltinthesoak:aidsintheremovalofglobularproteinsandindisinfectingthesoaksolution.BactericideLimitingthegrowthoforganismsorkillingthebacteria.Enzymaticsoaking/deg