Inqubo yokuqopha ibhodi le-PCB, esebenzisa izinqubo zokuhlanganisa amakhemikhali zendabuko ukugqwala izindawo ezingavikelekile. Kufana nokumba umsele, indlela esebenzayo kodwa engasebenzi kahle.

Enqubweni ye-etching, iphinde ihlukaniswe ibe inqubo yefilimu enhle kanye nenqubo yefilimu engalungile. Inqubo yefilimu enhle isebenzisa i-tin engaguquki ukuze ivikele isifunda, futhi inqubo yefilimu engalungile isebenzisa ifilimu eyomile noma ifilimu emanzi ukuze ivikele isifunda. Amaphethelo emigqa noma amaphedi awakhiwe ngendlela engafanele ngokwesikoetchingizindlela. Ngaso sonke isikhathi lapho umugqa ukhuphuka ngo-0.0254mm, unqenqema luzothambekela ngokwezinga elithile. Ukuqinisekisa isikhala esanele, igebe lezintambo lihlale likalwa endaweni eseduze yocingo ngalunye olusethwe ngaphambilini.

Kuthatha isikhathi esithe xaxa ukunamathisela i-ounce yethusi ukuze udale igebe elikhulu esikhaleni sentambo. Lokhu kubizwa ngokuthi i-etch factor, futhi ngaphandle komkhiqizi ohlinzeka ngohlu olucacile lwezikhala ezincane nge-ounce ngayinye yethusi, funda i-etch factor yomkhiqizi. Kubaluleke kakhulu ukubala umthamo omncane nge-ounce yethusi. I-etch factor iphinde ithinte imbobo yendandatho yomkhiqizi. Usayizi wembobo yendandatho yendabuko ingu-0.0762mm imaging + 0.0762mm yokubhoboza + 0.0762 stacking, ingqikithi engu-0.2286. I-Etch, noma i-etch factor, ingelinye lamagama amane ayinhloko acacisa ibanga lenqubo.

Ukuze kuvinjwe ungqimba oluvikelayo ukuthi lungawi futhi kuhlangatshezwane nezidingo zezikhala zesikhala zenqubo yokushumeka kwamakhemikhali, ukunamathisela okuvamile kubeka ukuthi isikhala esincane phakathi kwezintambo akufanele sibe ngaphansi kuka-0.127mm. Uma kucatshangelwa ukwenzeka kokugqwala kwangaphakathi kanye ne-undercut ngesikhathi senqubo yokuqopha, ububanzi bocingo kufanele bunyuswe. Leli nani linqunywa ukujiya kwesendlalelo esifanayo. Uma ungqimba lwethusi lushubile, kuthatha isikhathi eside ukunamathisela ithusi phakathi kwezintambo nangaphansi kwento evikelayo. Ngenhla, kunedatha emibili okufanele icatshangelwe ngokufakwa kwamakhemikhali: i-etch factor - inani lethusi eliqoshwe nge-ounce ngayinye; kanye negebe elincane noma ububanzi bephimbo ngewunsi yethusi.