Lub hauv paus ntsiab lus thiab lub hom phiaj ntawm Scouring ntawm paj rwb ntaub
Scouring yog siv tshuaj thiab lub cev txoj kev los tshem tawm tej yam ntuj tso impurities ntawm paj rwb ntaub, uas yog ua kom tiav lub hom phiaj ntawm scouring thiab purifying cellulose. Kev khawb yog ib qho tseem ceeb heev nyob rau hauv cov txheej txheemkho ua ntej.
Rau cov laus paj rwb fiber ntau, cov ntsiab lus cellulose yog ntau tshaj 94%. Hauv cov txheej txheem scouring, nws yuav tsum tau tshem tawm 6% impurities.
Yog tias txheej txheej sab nraud yog ze rau saum npoo, cov ntsiab lus ntawm impurities yuav siab dua. Cov impurities no feem ntau yog nyob rau saum npoo ntawm cov phab ntsa ntawm cov thawj cell thiab tsim ib txheej hydrophobic mesh nrog pectin raws li lub cev pob txha los ntawm adhesion ntawm cov saw tseem ceeb thiab ceg saw ntawm cov tshuaj pectin. Lub hom phiaj ntawmscouringyog kom rhuav tshem thiab tshem tawm cov txheej hydrophobic mesh no, tshwj xeeb tshaj yog tshem tawm cov quav ciab.
Lub hauv paus ntsiab lus thiab lub hom phiaj ntawm Bleaching ntawm paj rwb ntaub
Yuav muaj ib hom xim uas zoo li cov kua qaub dye nyob rau hauv cov txheej txheem loj hlob ntawm ntuj cellulose. Cov xim no tsis tuaj yeem raug tshem tawm kom huv hauv cov txheej txheem scouring. Nws tuaj yeem raug tshem tawm los ntawmtshuaj dawbtxheej txheem.
Lub hom phiaj tseem ceeb ntawm bleaching yog kom tshem tawm cov xim ntuj thiab ua kom cov xim dawb ntawm cov ntaub. Nyob rau tib lub sijhawm, nws yuav tsum tau tshem tawm lwm cov impurities seem ntawm cov paj rwb ntaub, xws li paj rwb noob plhaub, siv quav ciab thiab nitrogen tshuaj, thiab lwm yam.
Oxidants thiab txo cov neeg ua haujlwm tuaj yeem ntxuav cov fibers ntuj. Tab sis cov neeg ua haujlwm txo qis tsis tuaj yeem ua kom puas cov xim hauv cov fibers ntuj. Cov ntaub uas txo cov tshuaj bleached muaj txwv whiteness thiab yuav daj tom qab ntev. Tab sis oxidants tuaj yeem rhuav tshem cov xim molecules hauv cov fibers ntuj, uas tuaj yeem ua tiav cov nyhuv bleaching.
Feem ntau siv los txo cov tshuaj bleaching yog sodium sulfite, tsawg sodium sulfite thiab sodium hydrosulfite, thiab lwm yam. Thiab feem ntau siv oxidation bleaching agents yog hypochlorite, sodium chlorite, hydrogen peroxide thiab poov tshuaj permanganate, thiab lwm yam.
Post lub sij hawm: Aug-15-2023