Peb muaj keeb kwm ntev ntawm xyoob papermaking hauv Suav teb. Xyoob fiber ntau morphology thiab tshuaj muaj pes tsawg leeg yog tshwj xeeb. Qhov nruab nrab fiber ntau ntev yog ntev, thiab fiber cell phab ntsa microstructure yog tshwj xeeb. Lub zog txhim kho kev ua tau zoo thaum lub sij hawm pulping yog qhov zoo, muab cov bleached pulp zoo optical zog ntawm siab opacity thiab lub teeb scattering coefficient. Cov ntsiab lus ntawm lignin ntawm xyoob raw cov ntaub ntawv (kwv yees li 23% -32%) yog siab, uas txiav txim siab lub siab alkali npaum li cas thiab sulfidation degree thaum pulping thiab ua noj ua haus (lub sulfidation degree feem ntau yog 20% -25%), uas yog ze rau coniferous ntoo. . Lub siab hemicellulose thiab silicon cov ntsiab lus ntawm cov ntaub ntawv raw kuj coj qee qhov teeb meem rau kev ua haujlwm ib txwm siv ntawm cov ntaub so ntswg ntxuav thiab cov dej cawv dub evaporation thiab cov khoom siv concentration. Txawm li cas los xij, cov khoom siv xyoob ntoo tseem yog cov khoom siv zoo rau kev ua ntaub ntawv.
Cov tshuaj bleaching ntawm cov nroj tsuag loj thiab nruab nrab ntawm cov nroj tsuag xyoob yuav pib siv TCF lossis ECF cov txheej txheem bleaching. Feem ntau hais lus, ua ke nrog kev sib sib zog nqus delignification thiab oxygen delignification ntawm pulping, TCF los yog ECF bleaching technology yog siv. Nyob ntawm tus naj npawb ntawm cov theem bleaching, xyoob pulp tuaj yeem bleached rau 88% -90% brightness.
Peb cov bleached xyoob cov ntaub so ntswg yog tag nrho cov bleached nrog ECF (cov ntsiab lus chlorine dawb), uas muaj tsawg bleaching poob rau xyoob pulp thiab siab dua pulp viscosity, feem ntau ncav cuag ntau tshaj 800ml / g. ECF bleached xyoob cov ntaub so ntswg muaj cov ntaub so ntswg zoo dua, siv cov tshuaj tsawg dua, thiab muaj cov tshuaj bleaching siab. Nyob rau tib lub sijhawm, cov cuab yeej siv ua haujlwm tau paub tab thiab kev ua haujlwm tau zoo yog ruaj khov.
Cov txheej txheem ntawm ECF elemental chlorine-free bleaching ntawm xyoob cov ntaub so ntswg yog: ua ntej, oxygen (02) yog nkag mus rau hauv oxidation ntauwd rau oxidative delignification, thiab ces D0 bleaching-washing-Eop extraction-washing-D1 bleaching-ntxuav yog nqa tawm. nyob rau hauv ib nrab tom qab ntxuav. Cov tshuaj bleaching tseem ceeb yog CI02 (chlorine dioxide), NaOH (sodium hydroxide), H202 (hydrogen peroxide), thiab lwm yam. Thaum kawg, cov bleached pulp yog tsim los ntawm lub cev qhuav dej. Lub whiteness ntawm bleached xyoob cov ntaub so ntswg tuaj yeem ncav cuag ntau dua 80%.
Post lub sij hawm: Aug-22-2024
