Spheres can be placed by many methods. Depending on the scale of production, spheres are placed by printing, vacuum transfer, jetting, pick and place nozzles, and even tweezers. These methods are used to align solder spheres on substrates or die for subsequent soldering.
Companies which currently make ‘ball drop’ attachments for standard printing equipment include DEK and Speedline. There are also specialized machines that perform this stencil printing operation as well as prior flux transfer steps.
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