Mabokosi oyera owonetsera ndudu (bokosi lililonse la mabokosi 10, bokosi lililonse la mapaketi 7)

Kadibodi yoyera ndi mtundu wa pepala lolimba lolimba komanso lolemera kwambiri. Chifukwa chakuti pamwamba pake sipakhala utoto, nthawi zambiri limatchedwa kadibodi yoyera. Kadibodi yoyera yaku China imagawidwa m'magulu atatu A, B, C. Kuyera kwa giredi A sikochepera 92%; giredi B sikochepera 87%; giredi C sikochepera 82%.
Zinthu zopangira makatoni oyera ndi mankhwala oyeretsedwa 100%.
Makatoni oyera a mapaketi a ndudu amafunika kuuma kwambiri, kukana kusweka, kusalala komanso kuyera. Zofunikira pamwamba pa pepala ndi zathyathyathya, palibe mikwingwirima, mawanga, ziphuphu ndi mabala, kupindika ndi kusintha kwa kapangidwe. Monga momwe paketi ya ndudu yoyera imagwiritsa ntchito makina osindikizira a gravure othamanga kwambiri posindikiza, momwemonso zofunikira za chizindikiro cha tension cha makatoni oyera ndizokwera kwambiri. Kukana kwa tension kumadziwikanso kuti mphamvu yolimba kapena mphamvu yolimba, zomwe zikutanthauza kuti mphamvu yayikulu yomwe pepala lingathe kupirira ikasweka, imafotokozedwa mu kN/m. Makina osindikizira a gravure othamanga kwambiri amakoka mapepala, kusindikiza kwachangu kuti kupirire kupsinjika kwakukulu, ngati chochitika cha kusweka kwa mapepala nthawi zambiri, chimayambitsa nthawi yopuma pafupipafupi, kuchepetsa magwiridwe antchito, komanso kuwonjezera kutayika kwa mapepala.
Pali mitundu iwiri ya makatoni oyera a mapaketi a ndudu, imodzi ndi FBB (khadi loyera la yellow core), imodzi ndi SBS (khadi loyera la core core), mapaketi a ndudu pogwiritsa ntchito FBB ndi SBS ndi makatoni oyera okhala ndi mbali imodzi, FBB imakhala ndi zigawo zitatu za zamkati, gawo lakutsogolo ndi pansi pogwiritsa ntchito zamkati za sulfate, gawo lapakati pogwiritsa ntchito zamkati zamatabwa zopukutira mankhwala. Mbali yakutsogolo (mbali yosindikizira) ndi gawo lophimba, lomwe limayikidwa ndi zomangira ziwiri kapena zitatu, pomwe mbali yakumbuyo ilibe gawo lophimba. Popeza gawo lapakati limapangidwa ndi zamkati zamatabwa zopangidwa ndi mankhwala komanso makina, zamkati zimakhala ndi phindu lalikulu pamatabwa (85%-90%), ndipo mtengo wopanga ndi wotsika, kotero mtengo wa makatoni a FBB ndi wotsika.
Mapepala a FBB ali ndi ulusi wautali komanso ulusi wochepa komanso ulusi wochepa, kotero makulidwe a pepala lomalizidwa ndi abwino, ndipo gramu yomweyo ya FBB ndi yokhuthala kwambiri kuposa SBS, yomwe nthawi zambiri imapangidwa ndi zigawo zitatu za pulp, gawo lapamwamba, gawo lapakati ndi gawo la pansi zonse zimagwiritsa ntchito bleached sulfate wood pulp. Mbali yakutsogolo (mbali yosindikizira) ndi gawo lophimba, lomwe limayikidwa kawiri kapena katatu ndi squeegee yofanana ndi FBB, pomwe mbali yakumbuyo ilibe gawo lophimba. Popeza gawo lapakati limapangidwanso ndi bleached sulfate pulp, kuyera kwake kumakhala kwakukulu, kotero kumatchedwa white core white card. Nthawi yomweyo, ulusi wa pulp ndi wochepa ndipo pepalalo ndi lolimba, kotero SBS ndi yopyapyala kwambiri kuposa FBB yolemera gramu yomweyo. Mwachitsanzo, makulidwe a 230g/m2 FBB ya Hongta Renheng ndi 320μm, pomwe makulidwe a 230g/m2 SBS ndi 295μm.