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The Key to Precise Inline PCB Cleaning By Vladimír Sítko, Founder and Co-Owner, PBT Works T
oday’s PCB assemblies are complex, using large bottom-terminated compo- nents, such as BGAs, QFNs, and LGAs.
Requirements for robustness have become more strict, due to shortening distances between pins and expectations that the assem- blies must work in harsh environments. Studies have confirmed that cleaning
must be comprehensive. Even a tiny amount of flux residue can cause electrochemical migration (ECM), resulting in leakage cur- rent or shorts.
PCB Cleaning PBT Works offers its HyperSWASH as a
high-end cleaning system. It is the result of more than 30 years of tradition and experi- ence, with nearly 2,000 PCB cleaning system installations worldwide. Customer feedback is essential for the
company. Combining practical experience with theoretical studies has resulted in the machine’s single-chamber cleaning “proces- sor.” All subprocesses in the machine run in the same chamber. This kind of machine was often called a “batch machine.” Most batch machine development origi-
nated in other industries, such as kitchen- ware, laboratory ware or mechanical compo- nent cleaning. However, the requirements for electronic assembly cleaning are dramat- ically different. Today, the primary requirement is to
clean under components, because the pin-to- pin distances are very close. Also, power elec- tronics require a spotless surface, often pas- sivated before chip or wirebonding. The HyperSWASH is built especially for electron- ics applications, offering an excellent mix of features for PCB assembly cleaning.
spray system. It is similar to the nozzle sys- tem of inline cleaning machines, except that the HyperSWASH nozzles move in both directions, and the machine’s timing can be set independently for wash rinse and drying. The linear direct spray nozzle configura-
tion can clean all types of flux residues from most complex assemblies, with a maximum board size of 35 x 34.5 in. (89 x 88 cm). The machine processes two frames of assemblies per batch. Such a powerful nozzle configuration is
not always required. Some assemblies are less complex or flux residues are easily solu- ble. The HyperSWASH can work with other nozzle set combinations. Depending on the maximum PCB size, there are three different nozzle configurations — with three, two or one rack for baskets. These configurations can also be used for
cleaning boards in magazines. Cleaning in magazines with handling automation increases the system’s capacity enormously.
Cleaning Uniformity Both of these configurations provide uni-
HyperSWASH cleaning system with automatic handling.
The HyperSWASH has a linear driving
nozzle system that sprays under 90 degrees to the surface for high-performance cleaning. This configuration is called a linear direct
formity of cleaning across the process cham- ber. This uniformity is an essential require- ment for process control. The cleaning machine must produce the same quality of cleanliness in every position in the chamber. Running any control system for cleaning
Continued on next page
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30
30-Second
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99.97%
Communicates via USB
info.metcal.com/bvx-250
See BVX-250 and other Metcal innovations at IPC APEX Booth 3646
See at IPC APEX, Booth 3646
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