Issue link: https://iconnect007.uberflip.com/i/1545206
16 SMT007 MAGAZINE I JUNE 2026 BY V L A D I M I R S I T KO, P BT-WO R KS F E AT U R E A RT I C L E Even the most advanced cleaning chemis- try requires an effective delivery system, so select- ing the appropriate cleaning machine is crucial. Cleaning equipment must do far more than simply wash boards. As assemblies move toward lower standoff heights, finer pitches, and increasingly complex geometries, the equipment must deliver chemistry into confined spaces, reliably remove contamination, rinse thoroughly, and dry complete- ly, all while balancing throughput, operating costs, and long-term reliability requirements. This article examines the key engineering con- siderations for selecting cleaning equipment to clean highly dense assemblies. We will consider spray dynamics, machine configurations, process control, validation methods, and trade-offs among performance, cost, and manufacturing efficiency. Cleaning Equipment as a Reliability System In modern electronics manufacturing, cleaning machines are no longer viewed as simple post- soldering tools. They are engineered process systems designed to support long-term product reliability. An effective cleaning machine must be capable of: • Delivering controlled mechanical energy • Transporting cleaning chemistry into tight component geometries • Maintaining optimal wash chemistry conditions • Removing both ionic and non-ionic contamination • Thoroughly rinsing away wash chemistry and residues • Completely drying assemblies without trapped moisture For high-density assemblies, successful clean- ing depends on integrating all these functions. The cleaning process itself should consist of four primary phases: wash, rinse, DI rinse, and dry. Balancing Performance, Cost, and Reliability When Selecting a Cleaning Machine Figure 1: The four phases of the cleaning process.