Kev tsim thiab thov ntawm kev sib xyaw ua ke thiab kev ua haujlwm me me thiab ua tau zoo ntawm cov khoom siv hluav taws xob thawb PCB cov khoom siv thev naus laus zis mus rau txoj kev txhim kho kev ua haujlwm siab. Nrog kev nthuav dav sai ntawm PCB xav tau hauv kev lag luam hauv ntiaj teb, kev tsim tawm, ntau yam thiab thev naus laus zis ntawm PCB cov khoom siv cov khoom lag luam tau tsim los ntawm kev nrawm. Daim ntawv thov txheej txheej txheej txheej no, tau tshwm sim dav dav – ntau txheej luam tawm Circuit Board. Nyob rau tib lub sijhawm, cov khoom siv theem no hauv cov ntsiab lus ntawm cov qauv sib xyaw, tsim ntau dua nws cov kev sib txawv.

Txij thaum pib ntawm lub xyoo pua 20th mus txog rau qhov kawg ntawm xyoo 1940s, PCB cov khoom lag luam substrate kev lag luam yog thaum nws tseem me. Nws cov yam ntxwv kev txhim kho feem ntau cuam tshuam hauv: thaum lub sijhawm no, muaj coob tus resins, cov cuab yeej txhawb nqa thiab rwb thaiv tsev rau cov khoom siv substrate tau tshwm sim, thiab thev naus laus zis tau tshawb fawb ua ntej. Tag nrho cov no tau tsim cov xwm txheej tsim nyog rau qhov pom thiab txhim kho ntawm tooj liab-clad phaj, cov khoom siv feem ntau rau cov ntawv luam tawm Circuit board. Ntawm qhov tod tes, PCB kev tsim thev naus laus zis, uas siv cov txheej txheem txheej txheej hlau (rho tawm txoj hauv kev) los tsim cov khoom siv hluav taws xob raws li lub hauv paus ntsiab lus, tau pib tsim thiab tsim. Nws ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab cov txheej txheem txheej txheem thiab cov yam ntxwv tshwj xeeb ntawm tooj liab clad phaj.

Cov tooj liab-clad panels tau siv hauv PCB tsim tawm ntawm qhov ntsuas tiag tiag thiab tau tshwm sim thawj zaug hauv Asmeskas kev lag luam PCB xyoo 1947. PCB substrate cov khoom lag luam tau nkag mus rau nws thawj theem ntawm kev txhim kho. Hauv theem no, cov ntaub ntawv raw siv hauv kev tsim cov khoom siv substrate – cov khoom siv organic, cov khoom siv txhawb ntxiv, cov ntawv tooj liab thiab lwm yam kev tsim khoom siv thev naus laus zis, mus rau kev nce qib ntawm cov khoom lag luam substrate kom muaj zog. Vim li no, cov txheej txheem tsim cov khoom siv thev naus laus zis pib paub tab ib qib zuj zus.

Xyoo 1980s lig, cov khoom siv hluav taws xob nqa tau sawv cev los ntawm lub khoos phis tawj sau ntawv, xov tooj ntawm tes, thiab lub koob yees duab yees duab me tau pib nkag mus rau hauv khw. Cov khoom siv hluav taws xob no tau txhim kho sai sai hauv kev coj ua ntawm kev ua haujlwm me me, lub teeb yuag thiab ua haujlwm tau zoo, uas txhawb nqa qhov kev vam meej ntawm PCB mus rau lub qhov me thiab cov xov hlau. Raws li kev hloov pauv ntawm PCB kev xav tau kev lag luam, ib tiam tshiab ntawm pawg thawj coj saib xyuas ntau tus uas tuaj yeem paub txog cov kab hluav taws xob siab, BUM (BUM kom luv) tawm hauv xyoo 1990. Qhov kev siv thev naus laus zis tseem ceeb no tseem ua rau cov khoom lag luam substrate nkag mus rau theem tshiab ntawm kev txhim kho los ntawm cov khoom siv substrate rau kev sib txuas sib txuas sib txuas siab (HDI) ntau txheej. Hauv theem tshiab no, cov cuab yeej siv tooj liab ib txwm muaj ntsej muag tshiab. Muaj kev hloov pauv tshiab thiab kev tsim tshiab hauv PCB cov khoom siv substrate, tsis hais hauv kev tsim khoom, ntau yam tsim tawm, cov qauv txheej txheem, yam ntxwv ua haujlwm, lossis hauv cov khoom lag luam.

Kev tsim cov khoom siv PCB txheej txheem tau dhau los ze li 50 xyoo. Ib qho ntxiv, muaj kwv yees li 50 xyoo ntawm kev sim tshawb fawb thiab tshawb fawb txog cov khoom siv raw uas siv los ntawm kev lag luam – cov khoom siv roj hmab thiab cov cuab yeej txhawb nqa, thiab PCB cov khoom siv substrate tau sau keeb kwm ze li 100 xyoo. Txhua theem ntawm kev txhim kho cov khoom lag luam substrate tau tsav los ntawm kev hloov pauv tshiab ntawm cov tshuab ua tiav cov khoom lag luam, kev tsim khoom siv hluav taws xob ib leeg, kev teeb tsa hluav taws xob thiab tshuab hluav taws xob tsim hluav taws xob.