Ukwenziwa kwephepha le-bamboo eShayina kunomlando omude. I-morphology ye-bamboo fibre kanye nokwakheka kwamakhemikhali kunezici ezikhethekile. Ubude obujwayelekile be-fibre bude, futhi isakhiwo esincane sodonga lwe-fibre cell sikhethekile, ukushaya ngamandla okusebenza kokuthuthukiswa kwe-pulp kuhle, okunikeza i-pulp e-bleached izakhiwo ezinhle zokukhanya: ukungabonakali okuphezulu kanye ne-coefficient yokusabalalisa ukukhanya. Okuqukethwe kwe-lignin ye-bamboo eluhlaza (cishe u-23% kuya ku-32%) kuphakeme, okunquma ukupheka kwayo kwe-pulp nge-alkali ephezulu kanye ne-sulfide (i-sulfide ngokuvamile ingu-20% kuya ku-25%), eduze nokhuni lwe-coniferous; izinto zokusetshenziswa, i-hemicellulose kanye nokuqukethwe kwe-silicon kuphakeme, kodwa futhi nokuwasha kwe-pulp, ukuhwamuka kotshwala obumnyama kanye nohlelo lwemishini yokuhlushwa ukusebenza okuvamile kulethe ubunzima obuthile. Noma kunjalo, izinto zokusetshenziswa ze-bamboo akuyona into enhle yokusetshenziswa yokwenza iphepha.
Uhlelo lokumhlophela lwe-bamboo medium kanye nolwe-chemical pulp mill olukhulu lwesikhathi esizayo, luzosebenzisa inqubo yokumhlophela ye-TCF noma ye-ECF. Ngokuvamile, kuhlanganiswe nokujula kokumhlophela kanye nokumhlophela kwe-oxygen kwe-pulping, ukusetshenziswa kobuchwepheshe bokumhlophela be-TCF noma be-ECF, ngokuya ngenani lezingxenye ezahlukene zokumhlophela, i-bamboo pulp ingamhlophela ibe ngu-88% ~ 90% ISO whiteness.
Ukuqhathaniswa kwe-bamboo ECF kanye ne-TCF bleaching
Ngenxa yokuqukethwe okuphezulu kwe-lignin ye-bamboo, idinga ukuhlanganiswa nobuchwepheshe bokuhlukanisa okujulile kanye nokuhlukanisa i-oxygen ukulawula inani le-Kappa le-slurry engena ku-ECF kanye ne-TCF (kunconywa <10), kusetshenziswa uchungechunge lwe-Eop oluthuthukisiwe lwe-ECF bleaching sequence, ukwelashwa kwangaphambili kwe-acid noma uchungechunge lwe-Eop lwe-Two-Stage TCF bleaching sequence, konke okungasusa i-sulphated bamboo pulp ibe mhlophe kakhulu ibe yizinga eliphezulu le-88% ISO.
Ukusebenza kokumhlophe kwezinto zokusetshenziswa ezahlukene ze-bamboo kuyahlukahluka kakhulu, i-Kappa kuya ku-11 ~ 16 noma ngaphezulu, ngisho noma i-ECF ne-TCF yokumhlophe enezigaba ezimbili, i-pulp ingafinyelela kuphela izinga lobumhlophe obungu-79% kuya ku-85%.
Uma kuqhathaniswa ne-TCF bamboo pulp, i-ECF bleached bamboo pulp inokulahlekelwa okuncane kokumhlophe kanye ne-viscosity ephezulu, okungafinyelela ngaphezu kuka-800ml/g. Kodwa ngisho ne-TCF bleached bamboo pulp yesimanje ethuthukisiwe, i-viscosity ingafinyelela kuphela ku-700ml/g. Ikhwalithi ye-ECF kanye ne-TCF bleached pulp iyiqiniso elingenakuphikwa, kodwa ukucatshangelwa okubanzi kwekhwalithi ye-pulp, izindleko zokutshalwa kwezimali kanye nokusebenza, i-bamboo pulp bleach esebenzisa i-ECF bleaching noma i-TCF bleaching, akukaphethwa. Abenzi bezinqumo bebhizinisi abahlukene basebenzisa izinqubo ezahlukene. Kodwa kusukela ekuthambekeleni kwentuthuko yesikhathi esizayo, i-bamboo pulp ECF kanye ne-TCF bleaching kuzohlala isikhathi eside.
Abasekeli bobuchwepheshe bokuhlanzeka kwe-ECF bakholelwa ukuthi i-pulp ehlanzeka ye-ECF inekhwalithi engcono ye-pulp, ngokusetshenziswa kwamakhemikhali ambalwa, ukusebenza kahle okuphezulu kokuhlanzeka, kuyilapho uhlelo lwemishini luvuthiwe futhi lusebenza kahle. Kodwa-ke, abasekeli bobuchwepheshe bokuhlanzeka kwe-TCF bathi ubuchwepheshe bokuhlanzeka kwe-TCF bunezinzuzo zokukhishwa kwamanzi amdaka amancane esitshalweni sokuhlanzeka, izidingo eziphansi zokulwa nokugqwala kwemishini, kanye nokutshalwa kwezimali okuphansi. Umugqa wokukhiqiza ukuhlanzeka kwe-sulphate bamboo pulp TCF chlorine-free chlorine usebenzisa uhlelo lokuhlanzeka oluvaliwe kancane, ukukhishwa kwamanzi amdaka esitshalo sokuhlanzeka kungalawulwa ku-pulp engu-5 kuya ku-10m3/t. Amanzi amdaka avela esigabeni (PO) athunyelwa esigabeni sokuhlukanisa umoya-mpilo ukuze asetshenziswe, kanti amanzi amdaka avela esigabeni se-O anikezwa esigabeni sokuwasha ngesihlungo ukuze asetshenziswe, futhi ekugcineni angena ekubuyiselweni kwe-alkali. Amanzi amdaka ane-acid avela esigabeni se-Q angena ohlelweni lokwelapha amanzi amdaka lwangaphandle. Ngenxa yokuhlanzeka ngaphandle kwe-chlorine, amakhemikhali awaboli, imishini yokuhlanzeka ayidingi ukusebenzisa i-titanium nensimbi engagqwali ekhethekile, insimbi engagqwali evamile ingasetshenziswa, ngakho-ke izindleko zokutshala imali ziphansi. Uma kuqhathaniswa nomugqa wokukhiqiza we-pulp we-TCF, izindleko zokutshala imali zomugqa wokukhiqiza we-pulp we-ECF ziphakeme ngo-20% kuya ku-25%, kanti utshalomali lomugqa wokukhiqiza we-pulp nalo luphakeme ngo-10% kuya ku-15%, utshalomali ohlelweni lokubuyisa amakhemikhali nalo lukhulu, futhi ukusebenza kuyinkimbinkimbi kakhulu.
Ngamafuphi, ukukhiqizwa kwe-bamboo pulp TCF kanye ne-ECF bleaching yomhlophe ophezulu ongu-88% kuya ku-90% we-bamboo pulp egcwele i-bleach kungenzeka. Ukudonsa kufanele kusetshenziswe ngobuchwepheshe bokunweba okujulile, ukudonsa umoya ngaphambi kokukhipha i-bleach, ukulawula i-pulp ohlelweni lwe-bleaching lwe-Kappa, ukudonsa kusetshenziswa inqubo yokunweba ngemigqa emithathu noma emine yokudonsa i-bleach. Ukulandelana okuphakanyisiwe kwe-ECF bleaching ye-bamboo pulp yi-OD(EOP)D(PO), OD(EOP)DP; Ukulandelana kwe-L-ECF bleaching yi-OD(EOP)Q(PO); Ukulandelana kwe-TCF bleaching yi-Eop(ZQ)(PO)(PO), O(ZQ)(PO)(ZQ)(PO). Njengoba ukwakheka kwamakhemikhali (ikakhulukazi okuqukethwe yi-lignin) kanye nesimo se-fibre kuhluka kakhulu phakathi kwezinhlobo ezahlukene ze-bamboo, kufanele kwenziwe ucwaningo oluhlelekile mayelana nokusebenza kwe-pulping kanye nokwenza amaphepha kwezinhlobo ezahlukene ze-bamboo ngaphambi kokwakhiwa kwesitshalo ukuze kunikezwe isiqondiso sokuthuthukiswa kwemizila nezimo zenqubo ezifanele.
Isikhathi sokuthunyelwe: Septhemba 14-2024
