Pepala lopanda mpweya limagawidwa patsamba lapamwamba kapena pepala la CB (Coated BackPaper), tsamba lapakati kapena pepala la CFB (Coated Front & BackPaper) ndi tsamba lapansi kapena pepala la CF (Coated Front Paper).
Zigawo zodziwika bwino za zokutira za CB ndi zomwe amafunikira:
Zovala za CB zimapangidwa makamaka ndi ma microcapsules a chromogenic, spacers, zomatira, zowonjezera ndi madzi.
1. Ma Microcapsules ndi gawo lofunika kwambiri la zokutira za CB. Ubwino ndi mlingo wa ma microcapsules ndi ogwirizana kwambiri ndi mapangidwe amtundu wa pepala lopanda mpweya. Zomwe zimakhala zolimba za ma microcapsules nthawi zambiri zimakhala 40% mpaka 50%, makamaka zopangidwa ndi mafuta a utoto wopanda utoto, zida zapakhoma ndi mawonekedwe a Emulsifier. Ubwino wa ma microcapsules umakhudza kwambiri momwe amaperekera utoto, kufulumira, komanso kuipitsidwa kwapepala lopanda kaboni.
2. Kugwiritsiridwa ntchito kwa spacers mu zokutira za CB ndiko kupewa kuphulika msanga kwa ma microcapsules mothandizidwa ndi mphamvu zakunja panthawi ya batching ndi kuyanika. Wowuma wa tirigu pakadali pano ndiye spacer yomwe imagwiritsidwa ntchito kwambiri pazopaka za CB. Mlozera wapamwamba kwambiri wa spacer ndi kukula kwa tinthu tating'ono. Nthawi zambiri zimafunika kuti spacer yokhala ndi tinthu tating'ono mumtundu wa 15-25 μm iyenera kuwerengera 60-80%, ndipo kukula kwa tinthu kuyenera kukhala kwakukulu kuposa 40 μm. Kuchuluka kwa spacer nthawi zambiri kumakhala 30% mpaka 50% ya kuchuluka kwa ma microcapsules (chiwerengero chowuma). Kukula kwa tinthu tating'onoting'ono ta ma microcapsules kapena kufooka kwamphamvu kwa ma microcapsules, m'pamenenso spacer imafunika.
3. Pali mitundu iwiri ya zomatira zomwe zimagwiritsidwa ntchito mu zokutira za CB, imodzi ndi carboxylated styrene-butadiene latex ndipo ina ndi yosinthidwa wowuma. Palinso opanga ochepa omwe amagwiritsa ntchito mowa wa polyvinyl (PVA) wokhala ndi wowuma wosinthidwa. Pakati pawo, kuchuluka kwa carboxylated styrene-butadiene latex zambiri 3% mpaka 4% (pa utoto, youma chiŵerengero), ndi kuchuluka kwa kusinthidwa wowuma zambiri 10% mpaka 12% (pa utoto, youma chiŵerengero).
4. Zowonjezera zomwe zimagwiritsidwa ntchito muzovala za CB zimaphatikizapo dispersants, sodium carboxymethylcellulose (CMC) ndi zotetezera. The dispersant ndi sodium polyacrylate, mlingo nthawi zambiri 0.2% mpaka 0.3% (pa utoto, youma chiŵerengero), ndi mlingo wa sodium carboxymethylcellulose (CMC) zambiri 0.5% mpaka 1.5% ( Pakuti zokutira ndi youma chiŵerengero), akhoza kusinthidwa molingana ndi kukhuthala kwa ma viscosity a zokutira. Kuchuluka kwa zotetezera nthawi zambiri ndi 0.5% (ku wowuma, chiŵerengero chouma).
Zigawo zodziwika bwino za zokutira za CF ndi zofunikira zake:
Zovala za CF zimapangidwa makamaka ndi utoto, opanga utoto, zomatira, zowonjezera ndi madzi.
1. Cholinga cha ntchito ❖ kuyanika inkipepala lopanda kaboni ndi kudzaza ndi kuphimba pamwamba pa pepala m'munsi, kukonza kuyera ndi kuwala kwa pepala, kusintha kusalala ndi gloss wa pepala pamwamba, ndi kupanga pamwamba pa pepala kukhala yunifolomu ndi inki wabwino Absorbency, potsiriza kupeza zabwino. kusindikiza zotsatira. Mitundu yayikulu yomwe imagwiritsidwa ntchito popaka CF ndi kaolin ndi calcium carbonate.
2. Wopanga utoto wogwiritsidwa ntchito mu zokutira za CF makamaka phenolic resin, ndipo salicylate yaing'ono ya zinc imagwiritsidwa ntchito limodzi nayo. Cholinga chachikulu chogwiritsira ntchito zinc salicylate ndikusintha liwiro la kukula kwa pepala lopanda mpweya, makamaka pa kutentha kochepa. . Kuchuluka kwa opanga utoto nthawi zambiri kumakhala 11% mpaka 13% ya utoto wonse (chiwerengero chowuma), pomwe chiŵerengero cha phenolic resin ku zinc salicylate nthawi zambiri chimakhala 10: 1 (chiwerengero chowuma), kuwonjezera kwa zinc salicylate. kukhala mochulukira, apo ayi zidzawonjezera kuipitsa kwa pepala.
3. Pali mitundu iwiri ya zomatira zomwe zimagwiritsidwa ntchito mu zokutira za CF, imodzi ndi carboxylated styrene-butadiene latex ndipo inayo ndi yosinthidwa wowuma. Pakati pawo, kuchuluka kwa carboxylated styrene-butadiene latex zambiri 4% mpaka 5% (pa utoto, youma chiŵerengero), ndi kuchuluka kwa kusinthidwa wowuma zambiri 12% mpaka 14% (pa utoto, youma chiŵerengero).
4. Zowonjezera zomwe zimagwiritsidwa ntchito mu zokutira za CF zimaphatikizapo dispersants, sodium carboxymethyl cellulose, foam inhibitors, lubricants, preservatives ndi caustic soda. Kuphatikiza apo, popanga mapepala achikuda, utoto womwe umawonjezeredwa ku utotowo ndi ufa wofiira, ufa wachikasu, buluu wa emarodi ndi wobiriwira wa emarodi, ndi mitundu yofananira.pepala lopanda kabonizopangidwa ndi zofiira, zachikasu, zabuluu ndi zobiriwira.
Nthawi yotumiza: Apr-03-2023