PCB pressing common problems

PCB urgeat problemata communia

1. White, revealing the texture of the glass cloth

quaestio causas:

1. The resin fluidity is too high;

2. The pre-pressure is too high;

3. Leo addens pressuram altam est falsa;

4. Resina contenta vinculi humilis est, gel tempus longum est, et fluiditas magna est;

ipcb

Solutio:

1. Reducere caliditas vel pressura;

2. Reduce pre-pressure;

3. Diligenter observa resina in laminatione fluxum, post pressionis mutationem et caliditatem oritur, tempus applicandi altum pressionis initium compone;

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

Two, foaming, foaming

quaestio causas:

1. Pre-pressio humilis est;

2. Temperatura nimis alta est et intervallum inter pre- pressionem et pressuram plenam nimis longum est;

3. Viscositas dynamica resinae alta est, et tempus pressionem plenam addere nimis sero est;

4. The volatile content is too high;

5. Superficies compages non munda est;

6. Poor mobility or insufficient pre-stress;

7. Tabula temperatura humilis est.

Solutio:

1. auge pre- pressionem;

2. Refrigescant, pre-pressionem augent vel cyclum pre- pressionem minuunt;

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. Confirma operationis vim curationis purgationis.

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

7. Reprehendo calefacientis par et adjust caliditas stamper

3. Sunt foveae, resinae et rugae in superficie tabula

quaestio causas:

1. Impropria operatio LAUPONIUM, maculae aquae in superficie laminae ferreae quae aridae non sunt deletae, causando clauum aeris ad rugam;

2. Superficies tabula pressionem amittit cum premens tabulam, quae nimiam resinae iacturam facit, defectus glutinis sub bracteis cupreis, et rugae in superficie claui aeris;

Solutio:

1. Laminam chalybem diligenter purga et superficies claui aenei lenis;

2. Animadverte ad alignment lamellae superioris et inferioris cum laminis componendis, pressionem operantem minuere, RF% cinematographicum uti, resinae fluere tempus minuere et celeritatem calefactionis accelerare;

Fourth, the inner layer graphics shift

quaestio causas:

1. In bracteolae interioris exemplaris aes deprimens vires humilis habet, vel temperatura pauperis resistentia, vel linea latitudo nimis tenuis;

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

3. Exemplum torcular non est simile;

Solutio:

1. Transibit ad GENEROSUS tabulas interiores claua-stratas;

2. Reducere pre-pressionem seu reponere tenaces sheet;

3. Adjust the template;

Five, uneven thickness, inner layer slippage

quaestio causas:

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;

Solutio:

1. Ad eandem crassitudinem compone;

2. Adaequate crassitiem, elige laminam laminam aeneam cum parva crassitudine declinationis; Parallelismum tabulae pelliculae cinematographicae fervidae accommodae, multi- responsionis pro tabula laminata circumscribe libertatem, et laminas in media area e fervido-pressi exemplaris collocare contende;

Six, interlayer dislocation

quaestio causas:

1. Scelerata expansio materiae interioris iacuit et resinae fluxus ligaturae schedae;

2. Heat shrinkage during lamination;

3. Sceleris dilatatio coefficiens materiarum laminarum et exempla longe diversa sunt.

Solutio:

1. Continere proprietates schedae tenaces;

2. Patina in antecessum caloris tractata est;

3. Utere tabulato aereo interiore vestito tabulae et scheda compaginata cum stabilitate dimensiva bona.

Septem bractea curvatura, lamella warpage

quaestio causas:

1. Asymmetric structure;

2. cycli curandi sufficientes;

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

4. Multi- strati tabulae laminis vel compages schedae a diversis fabricantibus utitur.

5. Multilayer tabula improprie tractatur post curationem et pressuram solvens

Solutio:

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

2. Guarantee cycli curationis;

3. Contendunt sequi directionem constantem.

4. Prodest uti materiae ab eodem fabricante in forma composita

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

Octo, stratificatio, stratificatio caloris

quaestio causas:

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. Oxidatio abnormis est, et stratum oxydatum nimis longum; prae curatio satis superficiei non formavit.

6. Insufficient passivation

Solutio:

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

2. Improve the storage environment. The adhesive sheet must be used up within 15 minutes after being removed from the vacuum drying environment;

3. Operationem emendare et vitare contingentem superficiem compaginationis effectivam;

4. Confirma purgationem post operationem oxidationis; Monitor PH valorem aquae purgandae;

5. Tempus oxidationis abbreviare, solutionem oxidationis retrahitur, vel temperiem agunt, micro-etching auget, et condicionem superficiem meliorem facit.

6. sequere processus iudicium