Nrog rau kev nce qib ntawm thev naus laus zis, cov khoom siv hluav taws xob tau dhau los ua ib feem tseem ceeb ntawm lub neej niaj hnub. Cov khoom siv tseem ceeb uas siv rau hauv lawv qhov chaw tsim khoom yog siab - daim kab xev kub. Hauv kev tsim cov khoom siv hluav taws xob tseem ceeb-tshwj xeeb hauv Circuit Court boards- qee qhov yuav tsum tau muaj kev tiv thaiv thaum lub sij hawm Surface Mount Technology (SMT) txheej txheem. Daim kab xev yog siv los ua kom ruaj ntseg thiab daim npog qhov ncauj qhov ntswg, kom muaj kev tiv thaiv zoo thaum lub sij hawm reflow soldering.
High -tej kab xev ntsuas kub feem ntau siv polyimide (PI) substrate, muaj peev xwm tiv taus qhov kub thiab txias txog li 290℃-ib qho uas ua tau raws li qhov yuav tsum tau ua ntawm feem ntau cov txheej txheem SMT ntawm lub khw. Rau cov ntawv thov uas xav tau qhov kub thiab txias, polyethylene terephthalate (PET) substrates feem ntau xaiv; thaum PET muaj qhov kub tsis kam (feem ntau nyob ib ncig ntawm 200 degree), nws qhov zoo tshaj plaws yog tus nqi qis. PET tapes kuj muaj ntau yam xim ntau dua-xws li daj, xiav, liab, thiab ntsuab- whereas PI tapes feem ntau tuaj tsuas yog amber lossis dub, qhov sib txawv uas tuaj yeem pab txheeb xyuas thiab sau npe thaum siv.
PI daim kab xev, tseem hu ua polyimide daim kab xev, yog amber - cov kab xev xim uas tam sim no yog cov khoom lag luam tseem ceeb nrog cov ntawv thov dav. Nws nquag siv hauv kev kho lub xov tooj ntawm tes- pabcuam kev ua haujlwm xws li roj teeb qhwv thiab hluav taws xob rwb thaiv tsev- thiab yog siv hauv txhua yam khoom siv hluav taws xob thiab hluav taws xob.