Cov ntawv xov xwm hluav taws xob tau nce zuj zus mus rau hauv lub neej niaj hnub, tab sis ntawv luam tawm cov ntawv xov xwm tsis yog yuav tso lawv txoj haujlwm. Niaj hnub no, coob tus ntawm cov ntawv xov xwm ntawm ntau cov ncauj lus thiab cov lus qhia tau luam tawm. Rau kev tsim cov ntawv tshaj tawm no, cov ntawv tshwj xeeb zoo siv.
Daim ntawv yog tsim dab tsi
Kev tsim cov khoom ntawm txhua hom ntawv cuam tshuam nrog kev siv cov cog ntoo - cellulose. Qhov khoom siv no tau txais tsis yog los ntawm softwood thiab hardwood, tab sis kuj los ntawm khaub hlab ntau thiab daim ntawv pov tseg. Hauv kev tsim qee yam tshwj xeeb cov ntawv, asbestos, ntaub plaub thiab lwm yam khoom siv yog siv.
Cov ntaub ntawv zoo tshaj plaws rau kev ua daim ntawv yog ntoo thuv, spruce thiab birch. Ntawm lub sam thiaj thiab daim ntawv mills thiab mills, tsob ntoo txwv tsis pub ntxuav cov av thiab tawv ntoo, thiab tom qab ntawd, ntawm cov tshuab tshwj xeeb, lawv tau tawg rau lub xeev ntawm daim tawv nyias. Txheeb zoo mus thoob txhua theem ntawm cov txheej txheem thev naus laus zis, cov ntoo hloov mus rau hauv cov ntoo me me thiab sib tov nrog dej.
Qhov tshwm sim loj tau los ua lub ntsiab rau ua cov khoom lag luam ntawv.
Ua kom cov ntawv ua kom tsis zoo, nws yog kho nrog cov nplaim roj thiab cov tawv. Cov kua nplaum kua nplaum pab ua kom tiav ntawm cov ntawv du thiab ruaj khov. Rau cov ntawv luam tawm ua cov khoom lag luam zoo, whiteness thiab yam tsawg kawg nkaus transparency ntawm cov khoom yog qhov tseem ceeb. Cov khoom no tau muab los ntawm kev ntxiv: talc, kaolin, barium sulfate, titanium dioxide.
Cov yam ntxwv ntawm kev tsim cov ntawv rau cov ntawv xov xwm
Cov kev xav tau siab dua tau yuam rau ntawm daim ntawv rau cov khoom lag luam magazine. Cov neeg siv khoom zoo xav tau cov kev siv tshuaj sib txawv ntawm kev ua cov khoom siv. Piv txwv li, cov ntoo txho yog rhaub los ntawm ntxiv cov kua qaub rau cov lus muaj pes tsawg leeg. Tom qab ntawd los theem ntawm kev lim thiab ntxuav, thaum lub sij hawm cov khoom siv raw raug ntxuav ntawm kev ua kom tsis haum uas txo qhov khoom zoo.
Cov ntawv txheeb uas cov ntawv xov xwm ci ntsa iab tau luam tawm tau pom zoo heev. Cov nyhuv no tau tiav los ntawm pleev xim rau cov khoom siv. Coated ntawv tsis muaj qhov ntxhib vim tias nws siv cov ntawv ntim xws li kaolin. Hauv cov txheej txheem tsim tawm lossis ntawm cov theem tiav, cov ntawv txheeb rau cov ntawv xov xwm tom ntej yog yeej muaj ntsej muag nrog txoj hlua khi.
Sizing tiv thaiv lub vev xaib los ntawm fiber deformation uas tuaj yeem tshwm sim thaum lub sijhawm luam ntawv.
Txhawm rau ua cov ntawv xov xwm txaus siab rau tus nyeem ntawv nrog kev du thiab zoo, daim ntawv yog muab sau. Nrog rau qhov kev kho mob tshwj xeeb no, lub vev xaib dhau ntawm cov nplaim elastic. Qhov no tsim qhov tshwj xeeb: kev ua haujlwm siab thiab ntsuas kub kom tsim nyog. Daim ntawv yob cov nplooj ntawv ua lub nrig tsawg dua thiab tau txais qhov ua kom zoo dua. Txhua theem ntawm kev tsim, cov ntawv xov xwm tshaj tawm yog raug rau cov khoom kuaj xyuas nruj thiab tswj tau zoo.
