A gaskiya ma, PCB warping kuma yana nufin lanƙwasawa na allon kewayawa, wanda ke nufin allon kewayawa na asali.Lokacin da aka sanya kan tebur, ƙarshen biyu ko tsakiyar allon suna bayyana sama kaɗan.Wannan al'amari da aka sani da PCB warping a cikin masana'antu.
Tsarin lissafin wargin na hukumar shi ne a shimfiɗa allon kewayawa a kan tebur tare da kusurwoyi huɗu na allon a ƙasa kuma auna tsayin baka a tsakiya.Tsarin tsari shine kamar haka:
Warpage = tsayin baka/tsawon tsayin gefen PCB *100%.
Ma'auni na masana'antar da'ira warpage: A cewar IPC - 6012 (bugu na 1996) "Takaddun shaida don tantancewa da aiwatar da tsayayyen allunan bugawa", matsakaicin warpage da murdiya da aka yarda don samar da allunan kewayawa tsakanin 0.75% da 1.5%.Saboda iya aiki daban-daban na kowane masana'anta, akwai kuma wasu bambance-bambance a cikin buƙatun sarrafa shafin wargin PCB.Don 1.6 allon kauri na al'ada multilayer allon fuska biyu, yawancin masana'antun da'ira suna sarrafa PCB warpage tsakanin 0.70-0.75%, yawancin SMT, allon BGA, buƙatun tsakanin kewayon 0.5%, wasu masana'antun hukumar da'ira tare da ƙarfin aiwatarwa na iya haɓakawa. Ma'aunin yaƙe-yaƙe na PCB zuwa 0.3%.
Yadda za a kauce wa warping na da'irar jirgin a lokacin masana'antu?
(1) Shirye-shiryen da aka warkar da su a tsakanin kowane Layer ya kamata ya zama mai ma'ana, rabon allunan da'irar yadudduka shida, kauri tsakanin yadudduka 1-2 da 5-6 da adadin sassan da aka warkar da su ya zama daidai;
(2) Multi-Layer PCB core board da curing sheet yakamata suyi amfani da samfuran masu kaya iri ɗaya;
(3) A waje na A da B gefen layi mai hoto ya kamata ya kasance kusa da shi, lokacin da gefen A shine babban saman jan karfe, B gefen kawai 'yan layi, wannan yanayin yana da sauƙin faruwa bayan etching warping.
Yadda za a hana warping allon?
1.Engineering zane: interlayer Semi-curing takardar tsari ya kamata ya dace;Multilayer core panel da Semi-warke takardar za a yi daga wannan maroki;Wurin hoto na jirgin sama na C/S na waje yana kusa sosai, kuma ana iya amfani da grid mai zaman kanta.
2.Drying farantin kafin blanking: kullum 150 digiri 6-10 hours, ware da ruwa tururi a cikin farantin, kara sa resin curing gaba daya, kawar da danniya a cikin farantin;Baking sheet kafin buɗewa, duka Layer na ciki da buƙatun gefen biyu!
3.Before laminates, da hankali ya kamata a biya zuwa warp da weft shugabanci na solidified farantin: warp da weft shrinkage rabo ba iri daya ba, da kuma kula ya kamata a biya don rarrabe warp da saƙa shugabanci kafin laminating Semi-karfi takardar;Har ila yau, farantin mahimmanci ya kamata ya kula da jagorancin warp da weft;Gabaɗayan jagorar takardar maganin farantin shine jagorar Meridian;Dogon shugabanci na farantin karfen jan karfe yana da matsakaici;10 yadudduka na 4OZ ikon lokacin farin ciki takardar jan karfe
4.da kauri daga cikin lamination don kawar da danniya bayan sanyi latsa, trimming da raw baki;
5.Baking farantin kafin hakowa: 150 digiri na 4 hours;
6.It ne mafi alhẽri kada ku shiga ta hanyar inji nika goga, sinadaran tsaftacewa bada shawarar;Ana amfani da kayan aiki na musamman don hana farantin karfen lankwasa da nadawa
7.After spraying tin a kan lebur marmara ko karfe farantin halitta sanyaya zuwa dakin zafin jiki ko iska iyo gado sanyaya bayan tsaftacewa;
