Lub opacity ntawmluam ntawv yog ib qho cuab yeej yooj yim thiab ib qho ntawm cov cim tseem ceeb heev. Opacity yog ib qho tseem ceeb rau cov ntawv offset, tshwj xeeb tshaj yog cov ntaub ntawv uas tsis muaj qhov hnyav. Daim ntawv pob tshab uas siv rau kev luam ntawv ob sab lossis sau ntawv yuav siv tsis tau vim kev luam tawm. Yog li ntawd, yuav tsum muaj qee qhov opacity rau luam ntawv thiab sau ntawv siv ntawm ob sab kom ntseeg tau tias qhov zoo ntawm cov ntawv luam tawm.
Muaj ntau ntau yam uas cuam tshuam rau qhov opacity ntawm daim ntawv, ntawm cov uas yog lub hauv paus luj ntawm daim ntawv, cov tshuaj lom neeg lub cev ntawm lub pulp, ntau ntawm daim ntawv, lub whiteness ntawm daim ntawv, thiab cov nyhuv ntawm fillers. Paper mills feem ntau ua rau kom cov opacity ntawm daim ntawv los ntawm kev ntxiv filling kom cov hmoov tshauv ntawm daim ntawv los yog nce tus nqi ntawm cov neeg kho tshuab pulp, tab sis qhov nce ntawm cov ntaub ntawv tshauv thiab qhov nce nyob rau hauv tus nqi ntawm cov neeg kho tshuab pulp yuav txo tau lub cev muaj zog. ntawm daim ntawv, thiab lub tshuab ntawv yog nquag tawg thaum ua haujlwm.
Txhawm rau kom ntseeg tau tias lub zog muaj zog zoo ntawm cov khoom siv qis qis thawj dawbwoodfree ntawv, peb siv cov txheej txheem ntawm kev ntxiv dyes los txhim kho qhov opacity ntawm cov ntaub ntawv uas tsis tshua muaj nqi dawb offset tsis cuam tshuam rau cov xim dawb thiab xim ntawm daim ntawv.
Ntxiv peb colourants, muaj koob muaj npe xiav, magenta violet, thiab magenta daj, yuav ua rau kom cov opacity ntawm daim ntawv. Qhov dawb ntawm daim ntawv nrog qhov sib ntxiv ntawm magenta daj txo qhov pom tseeb, thiab qhov sib ntxiv ntawm cov xim muaj koob muaj npe xiav thiab magenta violet tsis muaj qhov pom tseeb ntawm qhov dawb. Ob leeg magenta violet thiab muaj koob muaj npe xiav yuav txo qis tus nqi b, thiab xim ntawm daim ntawv yuav hloov pauv loj heev.
Nyob rau hauv zus tau tej cov uas tsis muaj hnyav thawj dawboffset ntawv, cov txheej txheem tsim khoom qub tsis hloov pauv, thiab cov xim dawb thiab xim ntawm daim ntawv yog qhov ruaj khov, thiab qhov opacity ntawm daim ntawv tuaj yeem txhim kho tsuas yog los ntawm kev kho tus nqi ntawm dyes Royal xiav thiab daj ntxiv.
Post lub sij hawm: Oct-17-2022