Rau ntau qhov laj thawj, muaj ntau yam sib txawv ntawm PCB tsim cov haujlwm uas yuav tsum tau muaj qhov hnyav tooj liab. Peb tau txais cov lus nug los ntawm cov neeg siv khoom uas tsis paub txog lub tswv yim ntawm tooj liab qhov hnyav ib ntus, yog li tsab xov xwm no tsom los daws cov teeb meem no. Tsis tas li ntawd, cov hauv qab no suav nrog cov ntaub ntawv hais txog qhov cuam tshuam ntawm qhov sib txawv ntawm qhov hnyav tooj liab ntawm cov txheej txheem sib dhos PCB, thiab peb cia siab tias cov ntaub ntawv no yuav pab tau txawm tias cov neeg siv khoom uas twb paub txog lub tswv yim. Kev nkag siab tob txog peb cov txheej txheem tuaj yeem ua rau koj npaj tau zoo dua lub sijhawm tsim khoom thiab tag nrho cov nqi.

Koj tuaj yeem xav txog qhov hnyav ntawm tooj liab raws li qhov tuab lossis qhov siab ntawm cov kab tooj liab, uas yog qhov thib peb ntawm cov ntaub ntawv tooj liab txheej ntawm Gerber cov ntaub ntawv tsis xav txog. Chav ntsuas ntsuas yog ounces ib square feet (oz / ft2), qhov twg 1.0 oz ntawm tooj liab hloov mus rau ib lub thickness ntawm 140 mils (35 μm).

Hnyav tooj liab PCBs feem ntau yog siv hauv cov khoom siv hluav taws xob hluav taws xob lossis cov khoom siv uas yuav raug kev txom nyem los ntawm ib puag ncig hnyav. Thicker traces tuaj yeem muab kev ruaj khov dua, thiab tseem tuaj yeem ua kom cov kab mus nqa tau ntau dua tam sim no yam tsis tau nce qhov ntev lossis qhov dav ntawm cov kab mus rau qib tsis txaus ntseeg. Nyob rau lwm qhov kawg ntawm qhov sib npaug, sib dua tooj liab hnyav qee zaum tau teev tseg kom ua tiav ib qho kev cuam tshuam tshwj xeeb yam tsis tas yuav tsum muaj qhov ntev me me lossis qhov dav. Yog li ntawd, thaum xam cov kab dav, "tooj liab hnyav" yog qhov yuav tsum tau teb.

Qhov feem ntau siv tooj liab hnyav tus nqi yog 1.0 ooj. Ua kom tiav, haum rau feem ntau cov haujlwm. Hauv tsab xov xwm no, nws hais txog plating thawj qhov hnyav tooj liab mus rau tus nqi siab dua thaum lub sijhawm tsim khoom PCB. Thaum qhia txog qhov yuav tsum tau muaj qhov hnyav tooj liab hais rau peb pab pawg muag khoom, thov qhia qhov kawg (plated) tus nqi ntawm qhov yuav tsum tau tooj liab qhov hnyav.

Thick Copper PCBs raug suav hais tias yog PCBs nrog rau sab nrauv thiab sab hauv tooj liab tuab xws li 3 oz / ft2 txog 10 oz / ft2. Qhov hnyav tooj liab ntawm qhov hnyav tooj liab PCB uas tsim los ntawm 4 ounces ib square feet mus rau 20 ounces ib square feet. Kev txhim kho tooj liab qhov hnyav, ua ke nrog cov txheej txheej tuab dua thiab cov txheej txheem tsim nyog hauv lub qhov, tuaj yeem tig lub rooj tsav xwm tsis muaj zog rau hauv qhov chaw ruaj khov thiab txhim khu kev qha. Hnyav tooj liab conductors yuav ua rau kom lub thickness ntawm tag nrho cov PCB. Lub thickness ntawm tooj liab yuav tsum nco ntsoov txiav txim siab thaum lub sij hawm tsim Circuit Court. Lub peev xwm nqa tam sim no yog txiav txim siab los ntawm qhov dav thiab tuab ntawm cov tooj liab hnyav.

Tus nqi tooj liab siab dua yuav tsis tsuas yog nce tus tooj liab xwb, tab sis kuj ua rau cov khoom thauj khoom hnyav ntxiv thiab lub sijhawm xav tau rau kev ua haujlwm, txheej txheem engineering, thiab kev ruaj ntseg zoo, ua rau cov nqi nce ntxiv thiab lub sijhawm xa khoom tuaj. Ua ntej, cov kev ntsuas ntxiv no yuav tsum tau ua, vim tias cov txheej tooj liab ntxiv ntawm lub laminate yuav tsum tau siv sij hawm ntau dua thiab yuav tsum ua raws li DFM cov lus qhia tshwj xeeb. Qhov hnyav tooj liab ntawm lub rooj tsav xwm hauv Circuit Court kuj cuam tshuam rau nws cov thermal kev ua tau zoo, ua rau lub rooj tsav xwm hauv Circuit Court kom nqus cua sov sai dua thaum lub sij hawm reflow soldering theem ntawm PCB los ua ke.

Txawm hais tias tsis muaj tus qauv txhais ntawm hnyav tooj liab, nws feem ntau lees txais tias yog 3 ooj (oz) lossis ntau dua ntawm tooj liab siv rau ntawm cov txheej txheem sab hauv thiab sab nraud ntawm lub rooj tsav xwm luam tawm, nws yog hu ua hnyav tooj liab PCB. Txhua lub voj voog uas muaj tooj liab tuab tshaj 4 ooj ib square feet (ft2) kuj tau muab cais ua ib qho hnyav tooj liab PCB. Cov tooj liab heev txhais tau tias 20 mus rau 200 ounces ib square feet.

Cov txiaj ntsig tseem ceeb ntawm cov rooj sib tham tooj liab hnyav yog lawv lub peev xwm los tiv thaiv kev cuam tshuam ntau dhau ntawm cov tam sim no, qhov kub thiab txias dua, uas tuaj yeem rhuav tshem cov pa hluav taws xob hauv Circuit Court hauv ob peb feeb. Lub phaj tooj liab hnyav dua muaj qhov muaj peev xwm ua tau zoo, uas ua rau nws sib haum nrog cov ntawv thov hauv cov xwm txheej hnyav, xws li kev tiv thaiv thiab kev lag luam aerospace khoom. Qee qhov zoo dua ntawm cov tooj liab hnyav hluav taws xob muaj xws li:

Vim muaj ntau qhov hnyav tooj liab ntawm tib lub voj voog txheej, cov khoom loj yog compact
Hnyav tooj liab plated los ntawm qhov hla qhov siab tam sim no los ntawm PCB thiab pab hloov cov cua sov mus rau sab nraud lub dab dej
Airborne siab zog ceev planar transformer

Hnyav tooj liab luam tawm Circuit Court boards tuaj yeem siv rau ntau lub hom phiaj, xws li kev hloov pauv hloov pauv, cua sov dissipation, kev faib hluav taws xob siab, lub zog hloov hluav taws xob, thiab lwm yam. Qhov kev thov rau hnyav tooj liab coated boards hauv computers, tsheb, tub rog, thiab kev lag luam tswj kev lag luam txuas ntxiv mus. Heavy tooj liab luam ntawv Circuit Court boards kuj siv rau:

Fais fab mov
Kev xa hluav taws xob
Cov khoom siv vuam
Kev lag luam tsheb
Solar panel manufacturers, thiab lwm yam.

Raws li kev tsim qauv, tus nqi tsim khoom hnyav tooj liab PCB yog siab dua li ntawm PCB zoo tib yam. Yog li ntawd, ntau txoj kev tsim, tus nqi ntau dua ntawm kev tsim cov tooj liab PCBs hnyav dua.