Kufanele ukhethe kanjani PCB impahla

Izinto ezisetshenziswayo ukukhiqiza amabhodi wesifunda aphrintiwe (i-PCBS) zifaka phakathi iqembu lezinto zokuvikela / zokuhambisa ngamehlo nezokuhambisa ezisetshenziselwa ukwakha ukuxhumana kwebhodi lesifunda. Kunezinto ezahlukahlukene zokuhlangabezana nezidingo zokusebenza ezahlukene nezabelomali. Uhlobo lwento esetshenziselwe ukwenza i-PCS luyinto ebalulekile ekuqineni nasekusebenzeni kwezakhi ze-PCB. Ukukhetha impahla eyi-PCB efanele kudinga ukuqonda izinto ezitholakalayo nezakhiwo zazo, nokuthi zihambisana kanjani nomsebenzi oyifunayo webhodi.

Uhlobo lwebhodi lesifunda eliphrintiwe

Kunezinhlobo ezi-4 eziphambili ze-PCBS:

L Ngesandla Esiqinile – esiqinile, esingakhubazeki esisodwa – noma i-PCB emaceleni amabili

I-Flexible (Flex) – evame ukusetshenziswa lapho i-PCB ingenakugcinwa endizeni eyodwa noma endaweni engekho endizeni

L Isimo esiqinile-siyinhlanganisela ye-PCB eqinile futhi eguquguqukayo, lapho ibhodi eliguquguqukayo lixhunywe khona ebhodini eliqinile

L Imvamisa ephezulu – Lawa ma-PCBS asetshenziswa kakhulu ezinhlelweni ezidinga ukudluliswa kwesiginali esikhethekile phakathi kwelitshe nomamukeli.

Impahla ye-PCB ekhethiwe iyadingeka ukwenza ngcono ukusebenza komhlangano wokugcina webhodi wesifunda oprintiwe. Ngakho-ke, kubalulekile ukucubungula izidingo zokusebenza nezemvelo zezinto zesekethe.

Izici ezibonakalayo ezizocatshangelwa lapho kukhethwa izinto ze-PCB

Izici Ezine Eziyinhloko (kusuka ku-IPC 4101 – Ukucaciswa Kwezinto Zokusebenza Eziqinile ze-PCB) Uhlobo lwezinto ze-PCB lubalulekile ukusiza ekuchazeni ukusebenza kwento eyisisekelo.

1. Lokhu kubaluleke kakhulu ku-Z-axis. Ngokuvamile, ukunwetshwa kukhulu kunokushisa kokubola (Tg). Uma i-CTE yempahla inganele noma iphakeme kakhulu, ukwehluleka kungenzeka ngesikhathi sokuhlangana ngoba leyo nto izokwanda ngokushesha ngaphezu kwe-Tg.

2. Tg – Izinga lokushisa le-vitrification lokushintsha kwento ukushisa lapho okuguquguqukayo kokuqukethwe kusuka entweni eqinile engilazi kuya kwinto enjoloba futhi eguquguqukayo. Emazingeni okushisa aphezulu kunezinto ze-Tg, izinga lokukhula liyakhula. Khumbula ukuthi izinto zokwakha zingaba ne-Tg efanayo kepha zibe ne-CTE ehlukile. (I-CTE ephansi iyathandeka).

3.Td – ukushisa kokubola kwama-laminates. Leli yizinga lokushisa lapho impahla yehla khona. Ukuthembeka kukhubazekile futhi i-delamination ingenzeka njengoba impahla ikhipha kufika ku-5% wesisindo sayo sokuqala. I-PCB enokwethenjelwa okuphezulu noma i-PCB esebenza ngaphansi kwezimo ezinzima izodinga i-TD enkulu noma elingana no-340 ° C.

Isikhathi se-Delamination ku-T4 / T260 – 288 ° C no-260 ° C – Ukwehluleka kokuhlangana kwama-laminates ngenxa yokubola okushisayo (Td) kwe-epoxy resin matrix lapho ubukhulu be-PCB buguqulwa ngokungenakuphikwa.

Ukukhetha okungcono kakhulu kwe-laminate material ye-PCB yakho, kubalulekile ukwazi ukuthi ulindela ukuthi impahla iziphathe kanjani. Enye yezinhloso zokukhetha izinto ukuvumelanisa izindawo ezishisayo zento elaminishwe eduze nezinto ezizofakwa epuletini.