1. Feem ntau, cov dej noo ntawm ob daim ntawv offset rau luam ntawv yog siab dua (6-8%), thiab cov dej noo ntawm cov ntawv electrostatic yog qis dua (3.8-5%). Thaum luam tawm, cov ntsiab lus dej tsis tshua muaj peev xwm txo tau cov ntawv curl uas tshwm sim los ntawm qhov kub thiab txias sai sai. Yog tias ob daim ntawv offset siv tsis yog daim ntawv luam, daim ntawv yuav tsis sib npaug tom qab luam tawm vim muaj dej ntau. Rau ob chav offset ntawv luam ntawv, tsis tshua muaj noo noo yuav ua rau daim ntawv stretch thaum lub sij hawm luam ntawv raws li dej, ua rau tsis raug overprint thiab hais txog.
2. Electrostatic tswj feem ntau muab ob npaug rau offset ntawv rau luam ntawv nws tus kheej yog tsuas yog siv rau kev luam ntawv, nrog hluav taws xob zoo li qub; Cov ntawv luam ntawm electrostatic nws tus kheej tau tshem tawm cov hluav taws xob zoo li qub (ntxiv cov tshuaj tiv thaiv kab mob thaum lub sij hawm qhov loj me, thiab siv cov khoom tshem tawm electrostatic thaum txiav).
3. Cov ntawv kho qhov chaw (smoothness thiab nruj) feem ntau, ob daim ntawv offset luam ntawv txais cov txheej txheem nyuaj calendering los kho cov ntawv saum npoo kom ua tiav qhov kev xav tau los ntawm kev luam ntawv. Cov ntawv pub mis sib txawv tuaj yeem xav tau qis dua. Cov ntawv luam electrostatic siv cov tshuab ua kom zoo tshaj plaws rau cov ntawv kho mob. Qhov siab ntawm qhov roughness tuaj yeem ua tau zoo xoob tuab thiab nruj, txo cov ntawv jam tus nqi ntawm daim ntawv luam, thiab tswj kom muaj kev sib txhuam zoo nrog cov ntawv nqa lub log kom ntseeg tau tias cov ntawv zoo. Txawm li cas los xij, qhov roughness siab dhau tuaj yeem yooj yim ua rau cov ntawv tsis zoo thiab cov ntawv tsis zoo, thiab cov roughness tsawg dhau tuaj yeem ua rau plam nrog cov ntawv nqa lub log thiab daim ntawv jam. Ob daim ntawv offset tsis muaj qhov yuav tsum tau ua kom nruj, tab sis cov ntawv luam ntawv muaj qhov yuav tsum tau ua kom nruj dua, vim tias qhov tawv ntawm daim ntawv ncaj qha cuam tshuam rau cov ntawv luam. Tsis tas li ntawd, lub thickness ntawm ob daim ntawv offset yuav tsum tau qis thiab smoothness yuav tsum tau siab, thaum daim ntawv luam yuav tsum siab thickness thiab smoothness. Noj 70g daim ntawv ua piv txwv, cov tuab feem ntau yuav tsum yog 96-100um du, nrog qhov nruab nrab qhov zoo thiab qhov tsis zoo ntawm ntau tshaj 25s.
4. Whiteness feem ntau, qhov whiteness ntawm ob daim ntawv offset luam ntawv yog tsawg, thaum lub whiteness ntawm electrostatic luam ntawv yog siab, thiab luminescent tus neeg sawv cev ntxiv. Feem ntau, cov txheej txheem tsim khoom thiab txheej txheem ntawm ob daim ntawv offset luam ntawv zoo ib yam li cov ntawv luam. Ntau lub tuam txhab luam ntawv tau siv ob daim ntawv offset los yog phau ntawv ntawv muag nws li daim ntawv luam ntev dhau los. Yog tias tsis muaj qhov xav tau siab, cov ntawv ua tiav ob daim ntawv offset thiab daim ntawv luam tuaj yeem sib xyaw. Tshwj tsis yog tias koj siv lub tshuab luam ntawv siab, koj yuav tsum xaiv cov ntawv luam electrostatic.
