Ukuhlelwa kweziphene zokuPakisha (II)

5. Ukupheliswa

I-Delamination okanye indibaniselwano engekho mgangathweni ibhekisa kukwahlulwa phakathi kwesitywini seplastiki kunye nojongano lwaso lwemathiriyeli olukufutshane.I-Delamination ingenzeka kuyo nayiphi na indawo yesixhobo sombane esibunjiweyo;inokuthi yenzeke ngexesha lenkqubo ye-encapsulation, isigaba sokwenziwa kwe-post-encapsulation, okanye ngexesha lesigaba sokusetyenziswa kwesixhobo.

Unxibelelwano olulambathayo oluvela kwinkqubo yokufakwa kwe-encapsulation yeyona nto iphambili kwi-delamination.I-interface voids, ukungcoliseka komphezulu ngexesha lokugquma, kunye nokunyanga okungaphelelanga konke kunokukhokelela ekudibaneni kakubi.Ezinye izinto eziphembelelayo zibandakanya uxinzelelo lwe-shrinkage kunye ne-warpage ngexesha lokunyanga kunye nokupholisa.Ukungafani kwe-CTE phakathi kwesitywini seplastiki kunye nezixhobo ezimeleneyo ngexesha lokupholisa nako kunokukhokelela kuxinzelelo lwe-thermal-mechanical, olunokuthi lubangele i-delamination.

6. I-Voids

I-Voids ingenzeka nakweliphi na inqanaba lenkqubo ye-encapsulation, kubandakanywa ukubunjwa kokudluliselwa, ukuzaliswa, ukubumba, kunye nokuprintwa kwe-compound yokubumba kwindawo yomoya.I-Voids ingancitshiswa ngokunciphisa umthamo womoya, njengokukhupha okanye ukucoca.Uxinzelelo lwe-vacuum ukusuka kwi-1 ukuya kwi-300 Torr (i-760 Torr ye-atmosphere enye) kuye kwabikwa ukuba kusetyenziswe.

Uhlalutyo lokuzalisa lucebisa ukuba kukudityaniswa kwe-bottom melt front kunye ne-chip ebangela ukuba ukuhamba kuthintelwe.Inxalenye yomphambili onyibilikayo uqukuqela ukuya phezulu kwaye uzalise umphezulu wesiqingatha kufa kwindawo enkulu evulekileyo kumda wetshiphu.Umphambili osandula ukunyibilika kunye nomphambili we-adsorbed onyibilikayo ungene kwindawo ephezulu yesiqingatha sokufa, okukhokelela ekudubuleni.

7. Ukupakishwa okungalinganiyo

Ubukhulu bepakethe engaqhelekanga bunokukhokelela kwi-warpage kunye ne-delamination.Ubuchwephesha bokupakisha obuqhelekileyo, obufana nokubunjwa kodluliselo, ukubumba uxinzelelo, kunye neetekhnoloji zokupakisha, azinakwenzeka ukuba zivelise iziphene zokupakisha ezinobunzima obungafaniyo.Ukupakishwa kwenqanaba le-wafer kuchaphazeleka ngakumbi kubunzima obungalinganiyo beplastisol ngenxa yeempawu zenkqubo.

Ukuze kuqinisekiswe ukuqina kwetywina elifanayo, isithwali se-wafer kufuneka silungiswe ngokuthambeka okuncinci ukwenza lula ukunyuswa kwe-squeegee.Ukongeza, ulawulo lwendawo ye-squeegee luyafuneka ukuze kuqinisekiswe uxinzelelo oluzinzileyo lwe-squeegee ukufumana ubukhulu obufanayo betywina.

Ukubunjwa kwezinto ezihlukeneyo okanye ezingabonakaliyo kunokubangela ukuba iinqununu zokuzalisa ziqokelele kwiindawo ezihlala kwindawo yendawo yokubumba kwaye zenze ukusabalalisa okungafaniyo ngaphambi kokuqina.Ukuxuba okungonelanga kwe-sealer yeplastiki kuya kubangela ukuba kwenzeke umgangatho ohlukeneyo kwi-encapsulation kunye nenkqubo yokubumba.

8. Ungqameko olukrwada

IiBurrs yiplastiki ebunjiweyo edlula kumgca wokwahlula kwaye ifakwe kwizikhonkwane zesixhobo ngexesha lenkqubo yokubumba.

Uxinzelelo olungonelanga lokubamba ngoyena nobangela we-burrs.Ukuba i-residu yezinto ezibunjiweyo kwiikhonkwane azisuswanga ngexesha, kuya kubangela iingxaki ezahlukeneyo kwinqanaba lendibano.Ngokomzekelo, ukudibanisa okungonelanga okanye ukunamathela kwinqanaba lokupakisha elilandelayo.Ukuvuza kwe-resin luhlobo olubhityileyo lwe-burrs.

9. Amasuntswana angaphandle

Kwinkqubo yokupakisha, ukuba izinto zokupakisha zibonakaliswe kwindawo engcolileyo, izixhobo okanye izinto eziphathekayo, iinqununu zangaphandle ziya kusasazeka kwiphakheji kwaye ziqokelele kwiindawo zetsimbi ngaphakathi kwepakethi (njenge-IC chips kunye neendawo ezikhokelayo zokubambisana), ezikhokelela ekugqweni kunye nezinye. iingxaki zokuthembeka.

10. Ukunyangwa okungaphelelanga

Ukungonelanga kwexesha lokunyanga okanye ubushushu obuphantsi bokunyanga bunokukhokelela kunyango olungaphelelanga.Ukongezelela, ukutshintshwa okuncinci kumlinganiselo wokuxuba phakathi kwee-encapsulants ezimbini kuya kubangela ukunyanga okungaphelelanga.Ukuze ukwandise iipropati ze-encapsulant, kubalulekile ukuqinisekisa ukuba i-encapsulant iphiliswe ngokupheleleyo.Kwiindlela ezininzi ze-encapsulation, i-post-curing ivumelekile ukuqinisekisa unyango olupheleleyo lwe-encapsulant.Kwaye kufuneka kuthathelwe ingqalelo ukuqinisekisa ukuba i-encapsulant ratios ilinganiswe ngokuchanekileyo.