PCB board etching txheej txheem, uas siv cov txheej txheem tshuaj etching rau corrode qhov chaw tsis muaj kev tiv thaiv. Zoo li kev khawb ib lub trench, ib txoj kev siv tau tab sis tsis muaj txiaj ntsig.

Hauv cov txheej txheem etching, nws kuj tau muab faib ua cov txheej txheem zaj duab xis zoo thiab cov txheej txheem ua yeeb yaj kiab tsis zoo. Cov txheej txheem zaj duab xis zoo siv cov tin ruaj ruaj los tiv thaiv lub voj voog, thiab cov txheej txheem ua yeeb yaj kiab tsis zoo siv cov yeeb yaj kiab qhuav lossis zaj duab xis ntub los tiv thaiv lub voj voog. Cov npoo ntawm cov kab los yog cov ntaub qhwv yog misshapen nrog cov tsoosetchingtxoj kev. Txhua zaus cov kab yog nce los ntawm 0.0254mm, ntug yuav inclined mus rau ib qho twg. Txhawm rau kom muaj qhov sib txawv txaus, qhov sib txawv ntawm cov xaim yog ib txwm ntsuas ntawm qhov ze tshaj plaws ntawm txhua lub xaim ua ntej.

Nws yuav siv sij hawm ntau dua rau etch ounce ntawm tooj liab txhawm rau tsim kom muaj qhov sib txawv loj dua hauv qhov khoob ntawm cov hlau. Qhov no yog hu ua etch factor, thiab tsis muaj cov chaw tsim tshuaj paus muab ib daim ntawv teev meej ntawm qhov tsawg kawg nkaus qhov khoob ntawm ib ooj ntawm tooj liab, kawm cov chaw tsim khoom etch factor. Nws yog ib qho tseem ceeb heev los xam qhov tsawg kawg nkaus muaj peev xwm ib ooj ntawm tooj liab. Qhov zoo tshaj plaws etch kuj cuam tshuam rau cov chaw tsim khoom lub nplhaib lub qhov. Cov tsoos nplhaib qhov loj yog 0.0762mm duab + 0.0762mm drilling + 0.0762 stacking, rau tag nrho ntawm 0.2286. Etch, lossis etch factor, yog ib qho ntawm plaub nqe lus tseem ceeb uas qhia txog qib txheej txheem.

Txhawm rau tiv thaiv cov txheej txheem tiv thaiv kom tsis txhob ntog thiab ua tau raws li cov txheej txheem sib txawv ntawm cov tshuaj etching, ib txwm etching qhia tias qhov tsawg kawg nkaus ntawm cov xov hlau yuav tsum tsis pub tsawg dua 0.127mm. Xav txog qhov tshwm sim ntawm sab hauv corrosion thiab undercut thaum lub sij hawm etching txheej txheem, qhov dav ntawm cov hlau yuav tsum tau nce. Tus nqi no yog txiav txim siab los ntawm lub thickness ntawm tib txheej. Lub thicker txheej tooj liab, nws yuav siv sij hawm ntev dua rau etch tooj liab ntawm cov xov hlau thiab hauv qab txheej tiv thaiv. Saum toj no, muaj ob cov ntaub ntawv uas yuav tsum tau txiav txim siab rau tshuaj etching: lub etch factor - tus naj npawb ntawm tooj liab etched ib ooj; thiab qhov tsawg kawg nkaus qhov sib txawv los yog pitch dav ib ooj ntawm tooj liab.