Seb qhov zoo ntawm PCB number case yog zoo heev, nyob rau hauv lub hauv paus ntsiab lus, nws yog tsis yooj yim sua kom tawg tawm ntawm kev sib xyaw ntawm cov saum toj no loj Cheebtsam. Qhov zoo ntawm tus number case yog ib qho kev qhia dav dav ntawm kev tshawb fawb, kev nce qib thiab kev tiv thaiv ib puag ncig ntawm cov qauv. Nws yog reflected nyob rau hauv:

Viscosity yog lub npe luv rau dynamic viscosity. Feem ntau qhia los ntawm viscosity, uas yog, shear stress of fluid flow faib los ntawm kev tshaj tawm gradient nyob rau hauv cov kev taw qhia ntawm lub ntws txheej, lub thoob ntiaj teb chav tsev yog Pa/sec (Pa.S) los yog milliPascal/sec (mPa.S). Hauv PCB ntau lawm, nws hais txog fluidity ntawm tus number case tsim los ntawm sab nraud rog.

Conversion kev sib raug zoo ntawm viscosity unit:

1Pa. S=10P=1000mPa. S=1000CP=10dpa.s

Plasticity txhais tau hais tias tom qab tus number case yog deformed los ntawm sab nraud quab yuam, nws tseem khaws nws cov khoom ua ntej deformation. Lub plasticity ntawm tus number case yog qhov zoo rau kev txhim kho kev luam ntawv raug;

thixotropic (thixotropic) number case yog gelatinous thaum sawv, thiab viscosity hloov thaum kov. Nws tseem hu ua thixotropic thiab anti-sagging;

Fluidity (leveling) Qhov ntau npaum li cas tus number case kis tau nyob ib ncig ntawm qhov kev txiav txim ntawm sab nraud quab yuam. Fluidity yog reciprocal ntawm viscosity, thiab fluidity yog txuam nrog cov yas thiab thixotropy ntawm tus number case. Lub plasticity thiab thixotropy yog loj, fluidity yog loj; lub fluidity yog loj, lub imprint yog ib qho yooj yim mus nthuav. Me me liquidity, yooj yim tshwm sim netting, uas ua rau lub phenomenon ntawm number case tsim, kuj hu ua netting;

Viscoelasticity yog hais txog lub peev xwm ntawm tus number case uas yog sheared thiab tawg tom qab tus number case yog scraped los ntawm tus squeegee kom rebound sai. Nws yuav tsum tau hais tias tus number case deformation ceev ceev thiab tus number case rebounds sai sai yuav zoo rau luam ntawv;

Kev ziab kom qhuav yuav tsum tau tus number case kom qhuav ntawm qhov screen kom maj mam li sai tau, thiab nws cia siab tias tom qab tus number case raug xa mus rau lub substrate, qhov ceev yog qhov zoo dua;

Qhov loj ntawm cov xim zoo nkauj thiab cov khoom siv khoom siv, PCB number case feem ntau tsawg dua 10μm, thiab qhov loj ntawm qhov zoo yuav tsum tsawg dua li ib feem peb ntawm qhov qhib mesh;

Thaum tus number case yog siv los khaws tus number case, qhov degree uas tus number case filamentous tsis tawg thaum ncab yog hu ua stringiness. Tus number case filament yog ntev, thiab muaj ntau cov filaments ntawm tus number case nto thiab luam ntawv nto, uas ua rau cov substrate thiab cov ntawv luam ntawv qias neeg thiab txawm tsis tuaj yeem luam tawm;

Pob tshab thiab zais lub hwj chim ntawm tus lej

Rau PCB inks, raws li kev siv sib txawv thiab cov kev xav tau, ntau yam yuav tsum tau muab tso rau pem hauv ntej kom pom tseeb thiab zais lub zog ntawm tus number case. Feem ntau hais lus, circuit inks, conductive inks thiab cim inks txhua tus yuav tsum muaj lub zog zais siab. Lub solder resist yog yooj yim dua.

Tshuaj tiv thaiv ntawm tus number case

PCB inks muaj cov qauv nruj rau cov kua qaub, alkali, ntsev thiab cov kuab tshuaj raws li lub hom phiaj ntawm kev siv;

Lub cev tsis kam ntawm tus lej

PCB number case yuav tsum ua tau raws li cov khoom siv hluav taws xob sab nraud, thermal shock resistance, mechanical peel resistance, thiab ua tau raws li ntau yam kev siv hluav taws xob nruj;

Kev nyab xeeb thiab ib puag ncig tiv thaiv tus cwj mem

PCB inks yuav tsum muaj tshuaj lom neeg tsawg, tsis muaj ntxhiab, nyab xeeb thiab ib puag ncig zoo.

Saum toj no peb tau sau cov ntsiab lus ntawm kaum ob PCB inks. Ntawm lawv, hauv kev ua haujlwm tiag tiag ntawm kev tshuaj ntsuam luam ntawv, qhov teeb meem ntawm viscosity yog ze rau tus neeg teb xov tooj. Lub viscosity tseem ceeb heev rau qhov smoothness ntawm silk screen. Yog li ntawd, nyob rau hauv PCB number case technical ntaub ntawv thiab QC cov ntaub ntawv, lub viscosity yog kom meej meej cim, qhia nyob rau hauv dab tsi tej yam kev mob thiab hom viscosity xeem ntsuas siv.

Hauv cov txheej txheem luam ntawv tiag tiag, yog tias viscosity ntawm tus number case siab dhau lawm, nws yuav nyuaj rau luam tawm, thiab cov npoo ntawm cov duab yuav raug jagged hnyav. Txhawm rau txhim kho cov txiaj ntsig luam ntawv, lub thinner yuav muab ntxiv kom cov viscosity ua tau raws li qhov yuav tsum tau ua. Tab sis nws tsis yog qhov nyuaj kom pom tias ntau zaus, txhawm rau kom tau txais qhov kev daws teeb meem zoo tshaj plaws (kev daws teeb meem), txawm li cas los xij koj siv viscosity, nws tseem ua tsis tau. vim li cas? Tom qab kev tshawb fawb tob, nws tau pom tias tus number case viscosity yog qhov tseem ceeb, tab sis tsis yog tib qho xwb. Muaj lwm qhov tseem ceeb heev – thixotropy. Nws tseem cuam tshuam rau kev luam ntawv raug.