PCB pressing common problems

PCB cadaadiska dhibaatooyinka caadiga ah

1. White, revealing the texture of the glass cloth

dhibaatooyinka sababa:

1. The resin fluidity is too high;

2. The pre-pressure is too high;

3. Waqtiga lagu daro cadaadiska sare waa khalad;

4. Waxyaabaha resin ee xaashida isku-xidhka ayaa hooseeya, wakhtiga jelku waa dheer yahay, dheecaankuna waa weyn yahay;

ipcb

Solution:

1. Iska yaree heerkulka ama cadaadiska;

2. Reduce pre-pressure;

3. Si taxadar leh u fiirso qulqulka resin inta lagu jiro lamination, ka dib isbedelka cadaadiska iyo kor u kaca heerkulka, hagaajiso wakhtiga bilawga ah ee cadaadiska sare;

4. Adjust the pre-pressure\temperature and the start time of high pressure;

Laba, xumbo, xumbo

dhibaatooyinka sababa:

1. Cadaadiska hore ayaa hooseeya;

2. Heerkulku aad buu u sarreeyaa inta u dhaxaysa cadaadiska hore iyo cadaadiska buuxa waa mid aad u dheer;

3. Viscosity firfircoon ee resin waa sarreeyaa, iyo wakhtiga lagu daro cadaadis buuxa waa goor dambe;

4. The volatile content is too high;

5. Dusha isku xidhani ma nadiifsana;

6. Poor mobility or insufficient pre-stress;

7. Heerkulka looxa ayaa hooseeya.

Solution:

1. Kordhi cadaadiska ka hor;

2. Is qabooji, kordhi cadaadiska ka hor ama gaabin wareegga cadaadiska ka hor;

3. The time-activity relationship curve should be compared to make the pressure, temperature and fluidity coordinate with each other;

4. Reduce the pre-compression cycle and reduce the temperature rise rate, or reduce the volatile content;

5. Xooji awooda hawlgalka ee daaweynta nadiifinta.

6. Increase the pre-pressure or replace the bonding sheet.

7. Hubi kuleyliyaha isku midka ah oo hagaaji heerkulka istambarka kulul

3. Dusha sare ee looxa waxa ku yaal godad, xabag iyo laalaab

dhibaatooyinka sababa:

1. Hawlgalka aan saxda ahayn ee LAY-UP, wasakhda biyaha ee dusha sare ee saxanka birta ee aan la tirtirin, taasoo keenta in birta naxaasta ah ay laalaabto;

2. Dusha sare ee looxa waxa uu lumiyaa cadaadiska marka la cadaadiyo looxa, kaas oo keena luminta resin-ka xad dhaafka ah, la’aanta xabagta hoosteeda xaashida naxaasta ah, iyo laalaabyada dusha sare ee birta naxaasta ah;

Solution:

1. Si taxadar leh u nadiifi saxanka birta oo siman dusha sare ee foornada naxaasta ah;

2. Fiiro gaar ah u yeelo isku-dhafka taarikada sare iyo hoose ee taarikada marka la habeynayo taarikada, hoos u dhig cadaadiska hawlgalka, isticmaal filimka RF% hooseeya, gaabin wakhtiga qulqulka resinka iyo dardargelinta xawaaraha kuleylka;

Fourth, the inner layer graphics shift

dhibaatooyinka sababa:

1. Foornada naxaasta ah ee qaabka gudaha ah ayaa leh awood diirran oo hooseeya ama iska caabbinta heerkulka liidata ama ballaca khadka ayaa aad u dhuuban;

2. The pre-pressure is too high; the dynamic viscosity of the resin is small;

3. Habka saxaafaddu maaha mid isku mid ah;

Solution:

1. U beddel boodhka-lakabka gudaha ee tayada sare leh;

2. Iska yaree cadaadiska hore ama beddel xaashida xabagta;

3. Adjust the template;

Five, uneven thickness, inner layer slippage

dhibaatooyinka sababa:

1. The total thickness of the forming plate of the same window is different;

2. The accumulated thickness deviation of the printed board in the forming board is large; the parallelism of the hot-pressing template is poor, the laminated board can move freely, and the entire stack is off the center of the hot-pressing template;

Solution:

1. Isku hagaaji dhumucda guud ee isku midka ah;

2. Hagaajin dhumucda, dooro laminate naxaas leh oo dhumucdiisu yar tahay; hagaajin isbarbardhigga guddiga filimka kulul ee kulul, xaddid xorriyadda jawaab-celinta badan ee guddiga la-saaray, oo ku dadaal in aad dhigto laminate ee aagga dhexe ee qaabka kululaynta;

Lix, kala guurid dhexda

dhibaatooyinka sababa:

1. Balaadhinta kulaylka ee walxaha lakabka gudaha iyo qulqulka resin ee xaashida isku-xidhka;

2. Heat shrinkage during lamination;

3. Isku-dubbaridka ballaadhinta kulaylka ee walxaha laminateerka iyo qaab-dhismeedka ayaa aad u kala duwan.

Solution:

1. Xakamee sifooyinka xaashida dhejiska;

2. Saxanka ayaa horay loo daaweeyay kulaylka;

3. Isticmaal lakabka hoose ee looxa maxaasta ah iyo xaashida isku xidhka oo leh xasillooni cabbir wanaagsan.

Toddoba, saxan qaloocsan, saxan warpage

dhibaatooyinka sababa:

1. Qaab-dhismeedka asymmetric;

2. Wareega daawaynta oo aan ku filnayn;

3. The cutting direction of the bonding sheet or the inner copper clad laminate is inconsistent;

4. Guddiga lakabyada badan waxay isticmaalaan taargooyin ama go’yaal isku-xidha oo ka yimid soosaarayaal kala duwan.

5. Guddiga lakabka badan ayaa si khaldan loo maareeyaa ka dib daaweynta iyo sii deynta cadaadiska

Solution:

1. Strive for symmetrical wiring design density and symmetrical placement of bonding sheets in lamination;

2. Ballanqaadka wareegga daaweynta;

3. Ku dadaal jihada goynta joogtada ah.

4. Waxay faa’iido u yeelan doontaa in la isticmaalo alaabta ay soo saartay isla soo saaraha ee caaryada isku dhafan

5. The multilayer board is heated to above Tg under pressure, and then kept under pressure and cooled to below room temperature

Siddeed, stratification, kulaylka stratification

dhibaatooyinka sababa:

1. High humidity or volatile content in the inner layer;

2. High volatile content in the adhesive sheet;

3. Pollution of the inner surface; pollution of foreign substances;

4. The surface of the oxide layer is alkaline; there are chlorite residues on the surface;

5. oksaydhisku waa mid aan caadi ahayn, iyo lakabka oksaydhku waa mid aad u dheer; daawaynta ka hor ma samayn meel ku filan oo dusha sare ah.

6. Insufficient passivation

Solution:

1. Before lamination, bake the inner layer to remove moisture;

2. Hagaajinta deegaanka kaydinta. Xaashida xabagta waa in lagu isticmaalo 15 daqiiqo gudahood ka dib marka laga saaro deegaanka vacuum engejinta;

3. Hagaajinta hawlgalka oo iska ilaali taabashada meesha waxtarka leh ee dusha isku xidhka;

4. Xooji nadiifinta ka dib hawlgalka oksaydhka; la soco qiimaha PH ee biyaha nadiifinta;

5. Yaraynta wakhtiga oksaydhka, hagaajiso fiirsashada xalka oksaydhka ama ku shaqee heerkulka, kordhiya cuncunka yar yar, oo wanaaji xaalada dusha sare.

6. Raac shuruudaha nidaamka