Offset printing, tseem hu uaoffset lithography, yog ib qho ntawm cov kev lag luam luam tawm ntau tshaj plaws thoob ntiaj teb, muaj nuj nqis rau nws cov khoom zoo, sib xws, thiab tus nqi -kev ua tau zoo rau kev luam ntawv loj.
1. Txoj Cai Ua Haujlwm tseem ceeb
Offset printing yog raws li nyob rau hauvrepulsion ntawm roj thiab dej. Cov txheej txheem tseem ceeb suav nrog kev sib cais cov duab thiab tsis yog - cov duab thaj chaw ntawm lub phaj luam ntawv:
Duab thaj chaw: Hydrophobic (roj- ntxim nyiam) thiab number case-receptive. Lawv yog ua los ntawm lub teeb -sensitive polymer uas ua raws li tus cwj mem.
Tsis yog- thaj chaw duab: Hydrophilic (dej-kev nyiam) thiab number case-repellent. Lawv raug kho kom khaws tau ib zaj duab xis nyias ntawm dampening tov.
Tus txheej txheem hloov tus cwj mem nyob rau hauv ib txoj kev indirect:
Lub phaj luam ntawv yog coated nrog cov tshuaj dampening ua ntej, uas tsuas yog lo rau qhov tsis yog - duab.
Ink yog siv rau lub phaj; nws adheres tshwj xeeb rau cov duab cheeb tsam (vim dej repels number case).
Daim duab inked yog pauv (offset) los ntawm lub phaj mus rau ib daim pam roj hmab -lub tog raj kheej mos, hloov tau.
Daim pam roj hmab nias tawm tsam lub substrate (daim ntawv, cardboard, thiab lwm yam), xa cov duab mus rau cov khoom.
Qhov kev hloov pauv tsis ncaj no yog vim li cas nws thiaj li hu ua "offset"- tus number case tsis tiv tauj lub substrate ncaj qha los ntawm lub phaj, uas tiv thaiv lub phaj thiab ua kom pom tseeb, nkig.
2. Txheej Txheem Ntau Lawm
Kev ua tiav offset luam ntawv ua haujlwm suav nrog 5 theem tseem ceeb:
(1) Prepress Kev Npaj
Nov yog lub hauv paus kauj ruam los xyuas kom meej cov ntawv luam tawm:
Cov ntaub ntawv tsim & formatting: Tsim cov ntawv luam tawm - npaj cov ntaub ntawv siv software xws li Adobe Illustrator lossis InDesign. Cov kev cai tseem ceeb suav nrog kev teeb tsa hom xim kom raug (CMYK, tsis yog RGB- tseem ceeb rau qhov tseeb xim), ntxiv ntshav (feem ntau 3 hli) kom tsis txhob muaj ciam teb dawb, thiab kos tag nrho cov ntawv sau thiab cov duab.
Kev ua phaj: Cov ntawv luam tawm -cov ntaub ntawv npaj tau tso tawm rau lub phaj digital ntawm aCTP (Computer-rau-Plate)tshuab. CTP hloov cov yeeb yaj kiab ib txwm siv-raws li cov phaj ua, txhim kho kev ua haujlwm thiab txo qhov yuam kev. Lub phaj yog ces mounted rau lub tshuab luam ntawv xovxwm cylinder.
(2) Nias Teeb
Chaw thau khoom: Txhim kho cov ntawv luam ntawv, thauj cov substrate (daim ntawv, duab los qhia, yas, thiab lwm yam), thiab sau cov number case thiab dampening tov tanks.
Xim calibration & sau npe: Kho cov xovxwm kom haum rau plaub CMYK xim daim hlau kom meej (sau npe) kom tsis txhob plam. Ua cov ntawv luam tawm kom zoo - kho xim qhov ntom ntom, kom ntseeg tau tias cov zis sib phim cov ntaub ntawv pov thawj.
(3) Kev luam ntawv
Cov xovxwm khiav tsis tu ncua, nrog rau daim pam roj hmab hloov cov duab mus rau lub substrate. Cov neeg ua haujlwm saib xyuas cov txheej txheem kom tswj tau cov xim zoo ib yam thiab zoo, kuaj xyuas qhov tsis xws luag xws li smudges, misregistration, los yog number case.
(4) Ncej -nias Finishing
Cov theem no ntxiv tus nqi thiab kev ua haujlwm rau cov khoom luam tawm:
Cov txheej txheem yooj yim: Txiav, txiav, folding, thiab khi (stapling, zoo meej khi, eeb stitching).
Tus nqi - ntxiv cov txheej txheem: Lamination (glossy los yog matte los tiv thaiv qhov chaw), embossing / debossing (tsim tsa tsa los yog recessed qauv), ntawv ci stamping (ntxiv cov xim hlau), thiab tuag- txiav (shaping cov khoom rau hauv cov ntaub ntawv kev cai).
(5) Kev soj ntsuam zoo & ntim
Tshawb xyuas cov khoom tiav rau cov xim raug, luam tawm tsis xws luag, thiab qhov sib xws ntawm qhov sib xws. Cov khoom tsim nyog tau ntim rau kev xa khoom.
