Cov nyhuv ntawm Ink Rheology ntawm Printing Zoo
Jan 10, 2023
Hauv kev luam ntawv, tus cwj mem rheology muaj qee yam cuam tshuam rau qhov zoo thiab qib ntawm cov khoom luam tawm. Tom qab ntawd cov hauv qab no yuav txheeb xyuas cov khoom ntawm ntau yam rheological zog ntawm tus number case, thiab tau txais nws qhov tshwj xeeb cuam tshuam rau kev luam ntawv.
Cov khoom rheological ntawm tus number case muaj xws li number case viscosity, adhesion, yield value, thixotropy, fluidity thiab fluidity, transferability thiab lwm yam khoom.
1. Viscosity
Viscosity yog ib qho kev ntsuas ntawm lub peev xwm ntawm cov kua dej molecules los sib txuas los cuam tshuam cov txheeb ze ntawm cov molecules. Nws nthuav tawm cov cuab yeej ntawm kev tiv thaiv kev ntws hauv cov kua dej thiab qib ntawm nws tus kheej tsis kam ntws.
Hauv cov txheej txheem ntawm cov kua dej ntws, raws li cov qauv thiab cov khoom ntawm cov kua dej, nws yuav nyuaj rau ntws thaum cov kua dej nyob hauv lub xeev khov, thiab ntws zoo thaum cov kua dej nyob hauv lub xeev nyias. Yog vim li cas rau qhov tshwm sim yog tias muaj kev cuam tshuam ntawm cov kua dej molecules nyob rau hauv lub reflow. Lub zog tiv thaiv los ntawm kev nyiam yog hu ua kev sib txhuam sab hauv. Cov khoom ntawm cov kua dej no hu ua viscosity.
Viscosity yog ib qho tseem ceeb qhia txog tus cwj mem rheology. Ib qho viscosity nyob rau hauv cov txheej txheem luam ntawv yog lub hauv paus ntsiab lus los xyuas kom meej tus cwj mem kev txhawb nqa thiab kev hloov pauv tsis zoo, vim tias nws muaj feem cuam tshuam rau kev ua tiav ntawm cov txheej txheem luam ntawv thiab cuam tshuam ncaj qha rau cov xim xim xim. , Clarity thiab gloss.
Kev tswj tsis raug ntawm tus number case viscosity thaum luam ntawv yuav ua rau ntau yam kev ua tsis tiav rau kev luam ntawv. raws li nram no:
(1) Thaum lub viscosity ntawm tus number case loj dhau, lub viscosity loj dhau thiab cov stringiness muaj zog. Thaum lub sij hawm tus number case hloov txheej txheem, cov filament xaus yog ntev dhau lawm thaum sib cais ntawm tus number case rollers, thiab qhov tawg ntawm cov filament kawg yuav ua rau tus number case ya mus rau saum huab cua, ua rau tus number case ya tshwm sim thaum luam ntawv, uas yog pom tseeb dua hauv high-speed luam ntawv.
(2) Ntau dhau viscosity ntawm tus number case tuaj yeem ua rau qhov tshwm sim ntawm daim ntawv hmoov, napping lossis delamination. Qhov no yog tshwm sim los ntawm cov viscosity ntawm tus number case ntau tshaj lub zog saum npoo ntawm daim ntawv nyob rau hauv qee yam kev luam ntawv. Qhov tshwm sim no pom tseeb dua thaum cov qauv ntawm cov ntawv luam ntawv yog xoob thiab lub zog saum npoo tsis siab.
(3) Thaum tus number case raug xa mus thiab hloov ntawm tus number case rollers, cov viscosity ntau dhau yuav ua rau cov number case hloov tau nyuaj, vim tias tus number case hloov pauv hloov pauv mus rau qhov sib npaug ntawm cov viscosity, yog li cov viscosity ntau dhau yuav ua rau tsis sib xws ntawm tus number case thiab hloov mus rau tus number case. luam ntawv phaj los yog tus number case ntawm cov ntawv luam tawm tsis txaus, cov number case filaments tsis sib xws, thiab cov duab kos duab ntawm cov ntawv luam tawm raug nthuav tawm.
(4) Ntau viscosity ntawm tus number case yuav muaj qee yam cuam tshuam rau kev luam ntawv. Yog hais tias tus number case siv nyob rau hauv cov txheej txheem luam ntawv yog nce, tus number case txheej ntawm cov luam ntawv yog tuab heev, thiab lub ziab ceev yog qeeb, thiab nws yog ib qho yooj yim rau stain los yog lo rau sab nraum qab ntawm cov ntawv luam tawm. Nyob rau hauv daim ntawv tiaj tus luam ntawv, nws yog ib qho yooj yim uas yuav ua rau daim ntawv yuav dov rau hauv tus number case roller.
(5) Lub viscosity ntawm tus number case yog me heev, fluidity yog nce, thiab cov tsos ntawm tus number case yog qhia raws li lub thinness ntawm tus number case. Nyob rau hauv lithographic offset printing, number case emulsification yog nquag tshwm sim, ua rau qias neeg prints.
(6) Ink uas tsis tshua muaj viscosity yog feem ntau kis tau rau ntawm daim ntawv, ua rau ib tug loj print cheeb tsam thiab txo clarity, thiab nws txo lub firmness ntawm luam thiab nto ntawm lub substrate tom qab luam tawm qhuav thiab conjunctiva thiab lub gloss ntawm daim ntawv luam.
(7) Yog tias cov viscosity ntawm tus number case tsawg dhau, nws feem ntau tsis tuaj yeem tsav cov pigments nrog cov khoom loj hauv tus number case kom hloov mus ua ke, kom cov xim no maj mam tso rau ntawm tus number case roller, daim pam lossis luam ntawv phaj, sib sau ua ke. ib pawg-up phenomenon.
2. Yield tus nqi
Tus number case tawm tus nqi yog hais txog qhov tsawg kawg nkaus quab yuam yuav tsum tau thaum cov kua number case deforms thiab pib ntws.
Thaum tus number case pib deform nyob rau hauv qhov kev txiav txim ntawm shear stress, nws tsis ntws tam sim ntawd, tab sis qhov tshwm sim ntawm plug flow tshwm sim thaum lub shear stress maj mam nce. Plug flow yog hais txog qhov tshwm sim ntawm qhov hloov pauv uas cov kua dej ib feem deforms nyob rau hauv lub zog siv thiab ua rau laminar ntws. Raws li cov shear kev nyuaj siab nce, cov slug ntws txo. Thaum lub zog shear ncav cuag ib qho nqi, cov slug ntws ploj mus thiab cov dej ntws yog nyob rau hauv lub xeev laminar. Lub sijhawm no, tus number case ntws nyob rau hauv lub xeev khov, thiab cov yam ntxwv ntws ntawm cov kua yas tshwm.
