Kraft daim ntawv yog tsim los ntawm cov txheej txheem vulcanization, uas ua kom cov ntawv kraft zoo kawg nkaus rau nws txoj kev siv. Vim tias muaj cov qauv ntau ntxiv rau kev rhuav tshem, rhuav, thiab lub zog tensile, nrog rau qhov xav tau kom txo qis thiab qhov porosity siab, cov ntawv zoo tshaj plaws kraft ntawv muaj cov kev xav tau siab rau xim, kev ntxhib los mos, sib xws, thiab tus nqi zoo nkauj.
Yuav kom ua tau raws li cov qauv xim thiab cov qauv zoo nkauj, cov tawv nqaij yuav tsum tau bleached kom ua tiav qhov ci ntawm 24% thiab 34% thaum tuav cov pulp cov xim daj thiab xim liab qhov tseem ceeb, xws li tswj cov tawv nqaij dawb.
Kraft daim ntawv txheej txheem
Cov txheej txheem kraft ntawv tsim muaj cov theem hauv qab no.
1. Cov khoom siv raw
Txhua yam txheej txheem papermaking zoo ib yam, sib txawv tsuas yog qhov zoo, tuab, thiab ntxiv cov yam ntxwv ntxiv. Kraft daim ntawv yog tsim los ntawm cov ntoo fiber ntau ntev, thiab nws muaj qhov ntsuas lub cev ntau dua. Cov txheej txheem yields ib qho kev sib xyaw ntawm softwood thiab hardwood pulp uas ua tau raws li cov qauv zoo rau cov ntawv hwm kraft. Broadleaf ntoo pulp suav txog kwv yees li 30% ntawm tag nrho cov khoom. Qhov sib piv ntawm cov khoom siv raw no tsis muaj kev cuam tshuam rau lub cev lub zog ntawm daim ntawv, tab sis nws muaj kev cuam tshuam loj rau cov gloss thiab lwm yam.
2. Ua noj thiab tshuaj dawb
Kraft pulp yuav tsum muaj tsawg dua coarse fiber bundles thiab cov xim zoo ib yam, nrog rau ua tau raws li qhov yuav tsum tau ua rau kev ua noj ua haus zoo thiab cov txheej txheem bleaching. Nws tau lees paub tias kev ua noj ua haus thiab tshuaj dawb huv sib txawv ntawm cov qauv ntoo. Yog hais tias cov kab pulp tuaj yeem cais cov ntoo mos thiab cov ntoo tawv tawv, cov ntoo mos thiab tawv ntoo ua noj thiab tshuaj dawb tuaj yeem xaiv. Cov theem no ntiav ua ke ua ke coniferous thiab hardwood ua noj, nrog rau kev sib xyaw tshuaj dawb tom qab ua noj. Hauv cov txheej txheem tsim khoom, cov khoom siv tsis zoo xws li cov khoom siv fiber ntau tsis sib xws, cov pob khoom hnyav fiber ntau, thiab cov xim tsis ruaj tsis khov muaj ntau.
3. Nias
Kev txhim kho cov txheej txheem pulping yog ib kauj ruam tseem ceeb rau kev ua kom cov tawv tawv ntawm kraft ntawv. Nyob rau hauv dav dav, nce lub compression ntawm lub pulp thaum tuav nws zoo porosity thiab tsis nruj nruj yog tsim nyog los txhim kho daim ntawv toughness, ceev, thiab uniformity.
Kraft daim ntawv muaj lub zog ntau dua thiab muaj qhov yuam kev nyob rau hauv ntsug thiab sab sib txawv. Yog li ntawd, cov ntaub ntawv tsim nyog rau daim ntawv dav sib piv, cov tshuaj ntsuam shakers, thiab lub vev xaib qub yog siv los txhim kho qib. Txoj kev nias siv los ua daim ntawv cuam tshuam rau nws cov huab cua permeability, nruj, thiab smoothness. Nias txo qhov porosity ntawm daim ntawv, txo nws cov permeability thiab lub tshuab nqus tsev thaum nce sealability; nws kuj tuaj yeem ua kom lub cev muaj zog ntawm daim ntawv.
Cov no yog cov txheej txheem uas feem ntau ua kraft ntawv.
Lub sij hawm xa tuaj: Nov-30-2022