Carboxymethyl cellulose Sodium ya Kupaka Papepala

Carboxymethyl cellulose sodium (CMC-Na) ndi polima wosungunuka m'madzi womwe umagwiritsidwa ntchito kwambiri pamakampani opanga mapepala ngati zokutira.CMC-Naamachokera ku cellulose, yomwe ndi polima yachilengedwe yomwe imapezeka m'makoma a cellulose. Kusintha kwa mankhwala a cellulose ndi magulu a carboxymethyl kumabweretsa polima wosasungunuka m'madzi wokhala ndi mawonekedwe abwino kwambiri opangira filimu, ndikupangitsa kukhala chisankho choyenera pakuyika mapepala.

Kupaka mapepala ndi njira yogwiritsira ntchito nsalu yopyapyala pamwamba pa pepala kuti isindikizidwe, mawonekedwe ake, ndi machitidwe ake. Zipangizo zokutira zitha kugawidwa m'magulu awiri: zokutira zamtundu ndi zokutira zopanda pigment. Zovala zamtundu wa pigment zimakhala ndi mtundu wa pigment, pamene zokutira zopanda pigment zimakhala zomveka kapena zowonekera. CMC-Na imagwiritsidwa ntchito kwambiri ngati chomangira pazovala zopanda utoto chifukwa cha mawonekedwe ake opangira mafilimu komanso kutha kukonza zinthu zapamtunda monga kusalala, gloss, ndi kulandila kwa inki.

Kugwiritsa ntchito CMC-Na pakuyatira pamapepala kumapereka zabwino zingapo, kuphatikiza kumamatira bwino kwa zokutira, kusindikizidwa bwino, komanso kukana madzi. M'nkhaniyi, tisanthula zaubwinowu mwatsatanetsatane, komanso zinthu zosiyanasiyana zomwe zimakhudza magwiridwe antchito a CMC-Na popaka mapepala.

Kupititsa patsogolo Coating Adhesion

Ubwino umodzi wogwiritsa ntchito CMC-Na popaka mapepala ndikuthekera kwake kupititsa patsogolo kumamatira. CMC-Na ndi hydrophilic polima kuti angagwirizane ndi hydrophilic pamwamba pa ulusi pepala, kuchititsa adhesion bwino pakati ❖ kuyanika ndi pamwamba pepala. Magulu a carboxymethyl pa CMC-Na amapereka kachulukidwe kakang'ono ka malo oyimitsidwa molakwika omwe amatha kupanga zomangira za ionic ndi magulu okhala ndi ulusi wamapepala, monga magulu a amine kapena carboxylate.

Kuphatikiza apo, CMC-Na imathanso kupanga zomangira za haidrojeni ndi magulu a hydroxyl pa ulusi wa cellulose, kupititsa patsogolo kumamatira pakati pa zokutira ndi pepala. Kumamatira kwabwinoko kumabweretsa kusanjika kofananirako ndikuchepetsa chiwopsezo cha zokutira delamination pamachitidwe otsatila monga calendering kapena kusindikiza.

Kusindikiza Kwambiri

Ubwino wina wogwiritsa ntchito CMC-Na pakupaka mapepala ndikutha kupititsa patsogolo kusindikiza. CMC-Na imatha kupangitsa kuti pepala likhale losalala bwino podzaza ziboda ndi zibowo pakati pa ulusi wamapepala, zomwe zimapangitsa kuti pakhale mawonekedwe ofananirako komanso osalongosoka pang'ono. Kusalala kotereku kungapangitse kuti inki isamutsidwe bwino, kuchepetsa kugwiritsa ntchito inki, komanso kusindikiza bwino.

Kuphatikiza apo, CMC-Na imathanso kupititsa patsogolo kulandila kwa inki pamapepala popereka chosanjikiza chofananira chomwe chimatenga ndikufalitsa inki mofanana. Kulandila kwa inki kotereku kumatha kupangitsa kuti pakhale zithunzi zakuthwa, kuchulukitsidwa kwamitundu, komanso kuchepa kwa inki.

Kupititsa patsogolo Kulimbana ndi Madzi

Kukaniza madzi ndi chinthu chofunikira kwambiri cha zokutira pamapepala, makamaka pazogwiritsidwa ntchito pomwe pepala limatha kukhala ndi chinyezi kapena chinyezi. CMC-Na imatha kupititsa patsogolo kukana kwamadzi kwa zokutira zamapepala popanga chotchinga chomwe chimalepheretsa madzi kulowa mugawo la pepala.

Chikhalidwe cha hydrophilic cha CMC-Na chimalolanso kuti chizitha kuyanjana ndi mamolekyu amadzi, zomwe zimapangitsa kuti madzi asamayende bwino kudzera mu mgwirizano wa hydrogen ndi mapangidwe a interpenetrating polima network. Mlingo wa kukana madzi ukhoza kuwongoleredwa posintha ndende ndi digiri ya kulowetsedwa kwa CMC-Na pamapangidwe okutira.