Intego nyamukuru ya PCB Guteka ni ugukuraho ubushuhe, no gukuraho ubushuhe bukubiye muri PCB cyangwa bukorewe hanze, kuko ibikoresho bimwe byakoreshejwe muri PCB ubwabyo byoroshye molekile y'amazi.
Byongeye kandi, nyuma ya PCB ikorwa kandi ishyirwa mugihe runaka, hari amahirwe yo gukuramo ubuhehere mubidukikije, kandi amazi nimwe mubicanyi nyamukuru bya PCB popcorn cyangwa gucika intege.
Kuberako iyo PCB yashyizwe mubidukikije aho ubushyuhe burenze 100 ° C, nko guhaguruka.
Iyo umuvuduko wo gushyushya PCB wihuta, imyuka y'amazi izaguka vuba; Iyo ubushyuhe buri hejuru, ingano yumwuka wamazi izaba nini; Iyo imyuka y'amazi idashobora guhunga PCB ako kanya, hari amahirwe meza yo kwagura PCB.
By'umwihariko, ib icyerekezo cya PCB nicyoroshye cyane. Rimwe na rimwe, guhinduranya hagati y'ibice bya PCB birashobora kumeneka, kandi rimwe na rimwe birashobora gutera gutandukana kw'abakiriya ba PCB. Ndetse birakomeye, ndetse no kugaragara kwa PCB birashobora kugaragara. Ibintu nko mu rukwi, kubyimba, no guturika;
Rimwe na rimwe nubwo ibyavuzwe haruguru bidagaragara hanze ya PCB, mubyukuri birakomereka. Igihe kirenze, bizatera imikorere idahungabana ibicuruzwa byamashanyarazi, cyangwa caf nibindi bibazo, kandi amaherezo bitera ibicuruzwa.
Isesengura ryimpamvu nyayo yo guturika kwa PCB hamwe ningamba zo gukumira
Uburyo bwa PCB bwo guteka mubyukuri. Mugihe cyo guteka, ibipakira byumwimerere bigomba gukurwaho mbere yuko bishyirwa mu kigero, hanyuma ubushyuhe bugomba kuba burenga 100 ℃ kugirango ubushyuhe butagomba kuba burebure cyane kuburyo bwo kwirinda igihe cyo guteka. Kwagura cyane imyuka y'amazi izaturika PCB.
Muri rusange, ubushyuhe bwa PCB bworoshye muri gahunda ahanini hashyizweho ahanini saa 120 ± 5 ° C kugirango ubushuhe bushobora kuvanwa mu mubiri wa PCB mbere yuko bushobora kuba ku murongo wa SMT kugeza ku itanura.
Igihe cyo guteka kiratandukanye nubunini nubunini bwa PCB. Kubworoheje cyangwa manini pcbs, ugomba gukanda ikibaho ikintu kiremereye nyuma yo guteka. Ibi ni ukugabanya cyangwa kwirinda pCB ibintu bibabaje bya pCB byunganira PCB bitewe no kurekura ibibazo mugihe cyo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha nyuma yo gukonjesha.
Kuberako rimwe PCB yahinduwe kandi inahinduka, hazabaho impengamiro zitaringaniye mugihe cyo gucapa umusirikare muri Smt, zizatera umubare munini wumucuruzi cyangwa ugurisha ubusa mugihe cyahinduwe nyuma.
Kugeza ubu, muri rusange inganda zishyiraho ibihe nigihe bya PCB guteka kuburyo bukurikira:
1. PCB yashyizweho kashe neza mugihe cyamezi 2 yitariki yo gukora. Nyuma yo gupakurura, bishyirwa mubushuhe nubushyuhe bugenzurwa nibidukikije (≦ 30 ℃ / 60% RH, ukurikije IPC-1601) muminsi irenga 5 mbere yo kugenda kumurongo. Guteka kuri 120 ± 5 ℃ kumasaha 1.
2. PCB ibitswe amezi 2-6 kurenza umunsi wanyuma, kandi igomba gutekwa saa 120 ± 5 ℃ kumasaha 2 mbere yo kugenda kumurongo.
3. PCB ibitswe amezi 6-12 birenze itariki yo gukora, kandi igomba gutekwa saa 120 ± 5 ° C kumasaha 4 mbere yo kugenda kumurongo.
4. PCB ibikwa amezi arenga 12 uhereye kumunsi wo gukora. Ahanini, ntibisabwa kubikoresha, kuko imbaraga zo kurwangira mu musozi ziza imyaka mugihe runaka, nibibazo byiza nkibicuruzwa bidahungabana bishobora kugaragara mugihe kizaza, kizongera isoko ryo gusana. Byongeye kandi, inzira yumusaruro nayo ifite ingaruka nkisahani yo gucika intege no kurya amabati. Niba ugomba kuyikoresha, birasabwa gutekera saa 120 ± 5 ° C kumasaha 6. Mbere yo gutanga umusaruro, banza ugerageze gucapa ibice bike byanditse kandi urebe neza ko ntakibazo cyo kugurisha mbere yo gukomeza umusaruro.
Indi mpamvu nuko bidasabwa gukoresha PCB byabitswe igihe kirekire kuko guhagarika ubwinshi bwabo bizagenda binanirwa buhoro mugihe. Kuri ENG, ubuzima bw'imikoranire y'inganda ni amezi 12. Nyuma yiki gihe ntarengwa, biterwa no kubitsa zahabu. Ubunini bushingiye ku bunini. Niba ubunini burimona, igiceri cya Nikel kirashobora kugaragara kuri zahabu kubera gukwirakwiza no gukora okiside, bigira ingaruka ku kwizerwa.
5. PCB zose zatetse zigomba gukoreshwa muminsi 5, kandi PCB idatunganye igomba gutekwa saa 120 ± 5 ° C kumasaha 1 mbere yo kujya kumurongo.