Cov txheej txheem tsim cov ntawv yog kev sib koom ua ke ntawm cov khoom vaj khoom tsev ntuj tsim thiab tib neeg cov khoom siv tes ua, hloov cov paj ntoo xoob rau hauv cov txheej txheem, cov ntaub ntawv - nqa cov channel. Nws tsis yog ib qho kev nqis tes ua tam sim ntawd, tab sis yog cov kauj ruam sib txuas, txhua qhov tso lub hauv paus rau daim ntawv kev ntxhib los mos, kev ua tau zoo, thiab kev ua neej nyob.
Cov txheej txheem pib nrog kev npaj raw khoom. Ntoo pulp, feem ntau yog ua los ntawm cov ntoo coniferous thiab broadleaf, yog debarked, hlais, thiab pub rau hauv lub digester qhov twg cov tshuaj daws teeb meem lignin, cais cov ntshiab cellulose. Tsis yog - ntoo pulps xws li xyoob, hemp, thiab straw yuav tsum tau crushing ua raws li cov txheej txheem degumming. Qhov kub, lub sij hawm, thiab tshuaj sib piv ntawm theem no ncaj qha cuam tshuam rau fiber ntau ntev thiab purity, yog li txiav txim siab lub zog thiab fineness ntawm daim ntawv tiav. Tom ntej no los pulping thiab purification, qhov kev tshuaj ntsuam, slag tshem tawm, thiab bleaching txheej txheem tshem tawm impurities thiab pigments, uas ua rau lub teeb - xim pulp cawv nrog uniform fibers.
Cov kauj ruam hauv qab no yog batch thiab npaj. Raws li cov khoom yuav tsum tau, lub pulp yog tov nrog fillers, sizing agents, dyes, thiab lwm yam auxiliary cov ntaub ntawv nyob rau hauv meej proportions, thiab dej yog ntxiv los kho qhov concentration. Fillers txhim kho smoothness thiab whiteness, thaum sizing tus neeg sawv cev txhim kho dej tsis kam, tiv thaiv tus number case nkag thiab diffusion. Cov txheej txheem sib xyaw yuav tsum muaj kev tswj xyuas meej ntawm kev sib zog thiab lub sijhawm kom ntseeg tau tias cov khoom sib txawv ntawm cov khoom sib txawv thiab tsis txhob muaj qhov sib txawv ntawm kev ua haujlwm hauv cheeb tsam.
Lub hauv paus ntawm kev tsim yog hlau dewatering. Cov slurry npaj tau sib npaug mus rau qhov siab - nrawm txav cov hlau xaim, qhov twg cov dej tau lim tawm sai sai hauv qab lub ntiajteb txawj nqus thiab nqus nqus, thiab cov fibers intertwine ntawm cov hlau nto los ua ib daim ntawv ntub dej. Nyob rau theem no, cov ntaub ntawv ntub dej tseem muaj cov dej noo ntau thiab xav tau kev compression ntxiv hauv ntu xovxwm. Kev siv tshuab siab yog siv los nyem tawm cov dej seem, ua kom muaj fiber ntau sib khi nruj thiab txo kom qhuav lub zog noj.
Kev ziab ua rau daim ntawv nws cov duab kawg thiab lub zog. Cov ntaub ntawv ntub dej hla dhau los ntawm cov cua kub kom qhuav lub tog raj kheej, qhov chaw noo noo maj mam evaporates, thiab hydrogen bonding ntawm fibers yog ntxiv dag zog, ua rau daim ntawv tawv thiab dimensionally ruaj khov. Kev ziab kub thiab ceev yuav tsum tau tswj kom meej; Kev nrawm nrawm tuaj yeem ua rau curling lossis tawg, thaum qeeb qeeb yuav txo qhov ua tau zoo. Tom qab ntawd, nws nkag mus rau hauv calendering los yog kev kho deg, siv high -kub, siab -pressure rollers los txhim kho smoothness thiab gloss, los yog ntxiv coatings nyob rau hauv cov txheej txheem tshwj xeeb kom tau raws li qhov tshwj xeeb xav tau kev luam ntawv thiab sau ntawv.
Qhov kawg slitting thiab soj ntsuam txheej txheem txiav cov ntaub ntawv raw rau hauv cov khoom tiav specifications, thiab cov qauv yog randomly soj ntsuam raws li cov ntsuas xws li thickness, whiteness, thiab lub zog los xyuas kom meej ua raws li cov kev npaj siv cov qauv. Tag nrho cov txheej txheem yog sib cuam tshuam, los ntawm fiber ntau disintegration mus rau daim ntawv shaping, yuav tsum tau ob qho tib si kev tswj cov cuab yeej thiab kev nkag siab ntawm kev hloov maj mam hloov los ntawm kev paub.
Txoj kev taug kev zoo los ntawm fiber ntau mus rau ntawv- cov txheej txheem tsim cov ntawv sib cuam tshuam kev tshawb fawb thiab kev siv tes ua haujlwm, hloov cov txiaj ntsig zoo rau hauv qhov nruab nrab ntawm cov ntawv sau tau yooj yim, txuas ntxiv qhov muaj peev xwm ntawm tib neeg kev sib txuas lus thiab tsim nyob rau hauv txhua theem ntawm nws tsim.
