Eyona njongo iphambili yokubhaka i-PCB kukugxotha kwaye ususe umswakama oqulethwe kwi-PCB okanye ovela kwihlabathi langaphandle, kuba ezinye izixhobo ezisetyenziswa kwi-PCB icacisa ngokulula iimolekyuli zamanzi.
Ukongeza, emva kokuba i-PCB iveliswa kwaye ibekwe ixesha elithile, kukho ithuba lokufumana umswakama kwindalo esingqongileyo, kwaye amanzi yenye yezona zibulala i-PCB popcorn okanye ukulibazisa.
Kuba xa i-PCB ifakwe kwindawo apho iqondo lobushushu lingaphezulu kwe-100 ° C, njenge-oveni ye-oveni yokukhanyisa, i-waven egqwesileyo, amanzi ashushu okanye amanzi athatyathiweyo, andise ngokukhawuleza ivolumu yamanzi.
Ishushu ngokukhawuleza isetyenzisiwe kwi-PCB, ngokukhawuleza kuya kwandisa umphunga wamanzi; amaqondo obushushu aphezulu, omkhulu umthamo womphunga wamanzi; Xa umphunga wamanzi akanakubaleka kwi-PCB kwangoko, kukho ithuba elihle lokwandisa i-PCB.
Ngokukodwa, indlela ye-t ye-PCB yeyona ibuthathaka. Ngamanye amaxesha i-VIAS phakathi kweengqukuva ze-PCB zinokwaphuka, kwaye ngamanye amaxesha kunokubangela ukwahlulwa kwe-PCB. Kubaluleke nangakumbi, kwavela i-PCB inokubonwa. Uhlobo olunjengokuphazamiseka, ukudumba, nokuqhuma;
Ngamanye amaxesha nokuba le phenomena ingabonakaliyo ingabonakali ngaphandle kwe-PCB, inyanisiwe ngaphakathi. Ixesha elingaphezulu, iya kubangela imisebenzi engazinzanga yeemveliso zombane, okanye i-caf kunye nezinye iingxaki, kwaye ekugqibeleni zibangela ukusilela kwemveliso.
Uhlalutyo lwenyani yenyani yePCB ukuqhuma kunye nemilinganiselo yokuthintela
Inkqubo yokubhaka ye-PCB imbi kakhulu. Ngexesha lokubhaka, ukupakishwa kwasekuqaleni kufuneka kususwe ngaphambi kokuba kubekwe kwi-oveni, emva koko iqondo lobushushu kufuneka libe ngaphezulu kwe-100 ℃ ukuba ihambile kakhulu ukuba iphephe ixesha lokubhaka. Ukwandiswa kakhulu komphunga wamanzi kuya kuqhuma i-PCB.
Ngokubanzi, amaqondo obushushu e-PCB ukubhaka kwishishini asekwe kakhulu kwi-120 ± 5 ° 2 ° C ukuqinisekisa ukuba umswakama unokupheliswa kumzimba wePCB ngaphambi kokuba ithengiswe kumgca we-SMT kwi-SMT ye-SMT.
Ixesha lokubhaka lahlukile ngobukhulu kunye nobungakanani be-PCB. Ngeeplanga ezincinci okanye i-PCBS, kuya kufuneka ucinezele ibhodi ngento enzima emva kokubhaka. Oku kukunciphisa okanye ukunqanda i-PCB yenzekile kwi-PCB egody yescrustop ngenxa yokukhululwa koxinzelelo ngexesha lokupholisa emva kokubhaka.
Kungenxa yokuba emva kokuba i-PCB iqaqadekile kwaye igobile, kuya kubakho ukungakhathali okanye ukuphakama okungapheliyo xa uPrinta i-SMT, eya kubangela inani elikhulu leThuqu okanye elithengisa iziphene ezithengiswayo okanye ezingekho mthethweni ezingenanto.
I-PCB Baking Ukuseta imeko
Okwangoku, ishishini ngokubanzi libeka iimeko kunye nexesha lokubhaka i-PCB ngolu hlobo lulandelayo:
1. I-PCB itywinwe ngaphakathi kwiinyanga ezi-2 zomhla wokwenziwa. Emva kokungafakwanga, ibekwe kwimo yobushushu kunye nendawo yokulawulwa kweqondo lobushushu (≦ 38 ℃ / 60% rh, ye-IPC-1601) ngaphezulu kweentsuku ezi-5 ngaphambi kokuba i-intanethi. Bike nge-120 ± 5 ℃ ngeyure enye.
2. I-PCB igcinwe kwiinyanga ezingama-2-6 ngaphaya komhla wokuvelisa, kwaye kufuneka ibhakwe nge-120 ± 5 ℃ yeeyure ezi-2 ngaphambi kokuba i-intanethi.
3. I-PCB igcinwe kwiinyanga ezi-6 ukuya kwezi-12 ngaphaya komhla wokuvelisa, kwaye kufuneka ibhakwe nge-120 ± 5 ° C iiyure ezi-4 ngaphambi kokuba i-intanethi.
I-4. I-PCB igcinwe ngaphezulu kweenyanga ezili-12 ukusuka kumhla wokuveza, ngokusisiseko ayikhuthazwanga, kuba iBhodi yeBhodi yeZilayidi iya kwenzeka kwixesha elizayo, inkqubo yemveliso ikwanako ukuqhuma kweplate kunye ne-tin engapheliyo. Ukuba kuya kufuneka uyisebenzise, kuyacetyiswa ukuba ibike nge-120 ± 5 ° C kangangeyure ezi-6. Phambi kwemveliso yobuninzi, qala kuqala ukuprinta iziqwenga ezimbalwa zeThuthi hla kwaye uqiniseke ukuba akukho ngxaki impahla yokugcina iimpahla ngaphambi kokuba idlule kwimveliso.
Esinye isizathu kukuba ayicetyiswa ukuba isebenzise i-PCBS egcinwe ixesha elide kuba unyango lwabo luyasilela ngokuhamba kwexesha. Kwi-enikin, ubomi beshelgi yeshishini ziinyanga ezili-12. Emva kweli xesha, kuxhomekeke kwidipozithi yegolide. Ubungqingqwa buxhomekeke kubungqingqwa. Ukuba ubukhulu bumncinci, umaleko we-nickel unokuvela kwi-Golder Golder ngenxa yokwahluka kunye nefom oxidation, echaphazela ukuthembeka.
I-5. Zonke ii-PCB ezibhakiweyo kufuneka zisetyenziswe kwiintsuku ezi-5, kwaye i-PCB ezingenabuthathaka maziphethwe kwakhona nge-120 ± 5 ° C enye iyure enye ngaphambi kokuba i-intanethi.
