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Via Filling The demand for filling of through holes with epoxy resin or conductive paste has been rising ever since surface-mount technology became widely adopted in the PWB industry.

22.5.3.1 Basics. Following are the traditional examples of the types of applications that require via filling processing capability:

Preventing acid residue from attacking the Cu plating at the through-hole opening, which can in turn cause an open circuit Averting mishandling due to loss of vacuum during board-level assembly or during vacuumassisted transport in production Avoiding blowout of flux and/or solvent residue during assembly and solder reflow Stopping flux from dripping from the through holes to the opposite side of the PWB Keeping solder resist ink from migrating into through holes during screen printing, which can cause formation of nodules at the through-hole opening during solder plating and/or gold plating Enhancing the planarity of solder resist on the surface of filled through holes and the planarity of core layer for SBU PWBs Improving the stability of solder paste printing volume for via-in-pad designs Preventing the migration of solder into through holes in via-in-pad designs

Persuasive speeches and some technical brie ngs typically use the problem-solution pattern. This structure describes an existing problem, gives reasons for the situation, states potential solutions, and points out your recommended action. Many commercials are designed using this pattern. A very popular problem-solution technique was developed in the 1930s by Alan Monroe, a professor at Purdue University. It s called Monroe s motivated sequence and is still used to sell ideas today.

The filling of through holes with nonconductive resin and conductive materials using dispensing, screen-printing, and roll-coating methods has been extensively evaluated and tested. Of the three basic methods described earlier, screen printing is the most common process. It allows for efficient, selective filling of large numbers of through holes. 22.5.3.2 Via-Filling Materials. Selection of the proper resin-based material is the most important objective when using a screen-printing process to fill through-hole vias in build-up multilayer cores. In particular, the primary issues to be considered when choosing an appropriate fill material are:

The most commonly used materials for permanently filling through holes include singlecure (thermal) resins, photoimageable dielectrics, conductive pastes, and the dual-cure (UV + thermal) epoxy resin utilized in the Noda screen flat plug process Following are brief descriptions and comparisons of the characteristics of each of these types of via-fill materials 225321 Conventional Prepregs and RCC In fabricating a base core with a pattern, the core panel is usually panel-plated and the pattern is made with a dry-film tenting process Some fabricators seem to prefer pattern plating, however The choice depends on the fabricator s familiarity with these processes After the pattern is formed, dielectric material is laminated over the core (in the case of prepreg, with copper foil) and the holes can be filled with resins, depending on the plated hole diameter and the thickness of the core.

(b) the Weyl scalars all vanish (c) the only nonzero Weyl scalar is 0 or 4 , and there are two principal null directions (d) there is one doubly repeated null direction and the nonzero Weyl scalars are 0 , 2 , and 4

It is generally agreed that when the diameter of plated holes is equal to or less than 03 mm and the core thickness is equal to 06 mm or less, these holes can be filled effectively by the lamination process (although the resin thickness of 80 m is preferred in the case of RCC) See Fig 2215 When the diameter/thickness conditions are not met, it is necessary to fill the holes using a separate process A screening process does this from one side of the panel with polyester screen with an oversized hole pattern After hole filling and curing the resin completely, the fabricator removes excess resin using a belt sander (#600 to #800) or a ceramic brush Figure 2216 illustrates the processThis is a tricky but necessary operation for microvia board makers, particularly for photovia processing.

Hole filling is costly but yields a few advantages over simultaneous hole filling by lamination of RCC or prepreg The edge of the plated holes is well protected; therefore, forming.

A useful empirical equation for calculating the manufacturing cost is: Cost C = (material + process costs) Yield Y (2.3)

To establish the effect of the interconnection density Id on the final yield of substrates, the total processing yield can be split into two components: one that depends on the conductor density, i.e., YId, and the second, which is a function of the combined yields of the rest of the manufacturing processes: Ytotal = YId*Yproc (2.4)