Micro-Dosing of Solder Paste on PCB-boards and elements

The dispensing of tiny dots or lines of solder pastes on PCB-boards is getting more and more important. Precision and accuracy are essential for the features of such electrical parts and components. Therefore, the PCP-technology offers tremendous advantages and benefits when these small volumes should be dispensed.

By using the PCP-technology an accuracy and repeatability of +/- 99% could be guaranteed. A clean and safe process will be ensured by the adjustable suck-back of the dispenser.

Typical solder pastes contain mainly metal particles (up to 90 %) and binder. The metal particles are extremely abrasive and are therefore really challenging the dispensing system. By using a special developed rubber mixture (hi-act), in combination with a special coating of the rotor and drive shaft, VISEC offers a perfect solution to handle such highly abrasive pastes. The life time of the rotor could be extended to 4-5 times in comparison to a standard hard-chrome plated rotor assembly and even the life-time of the stator could be extended to 2-3 times compared to a stator with standard rubber.

For applications on PCB-boards or other small and tiny electrical parts, the VISEC D03/UD03 rotor and stator combination, offers dosing quantities down to approx. 0.00025 cc. Smallest dot sizes of solder pastes could be dispensed without any problems.

VISEC is specialized in developing customized compounds for specific applications. Hi-act stator material is especially suitable for dosing applications with highly filled materials and abrasive particles. The features of this rubber compounds guarantee a smooth dispensing process for abrasive particles and the wear and tear of hi-act is quite small compared to other available rubber materials on the market.

At the rotor and shaft side, VISEC has developed a special coating mixture and method to offer a very resistant and hard surface to withstand even extreme influences by very abrasive pastes and liquids. The dosing of micro -dots of solder pastes could be handled in a very smooth and accurate way.

Compared to solutions, where the rotor is made of ceramic, the coated rotor assembly offers a wide range of advantages: the surface of the coated rotor is also extremely hard and robust, but less expensive compared to ceramic material. The manufacturing process of the coated rotor itself, is much easier compared to the complex process of producing ceramic rotors. Also, at ceramic parts, there is always the risk of easy breakage and damage.

Due to the perfect combination of hi-act stator and special coated rotor, downtimes and long maintenance times could be avoided. Compared to competitor’s products, the life-time of these parts is much higher. This means less production interruptions, more process reliability and safety, higher quality standard and of course, less costs.

VISEC offers the core components for PCP-dispenser and therefore tremendous advantages for companies, who intend to design and build their own units. By using existing components, like motor or control units this offers excellent synergy effects. The design of the PCP-dispenser could be adjusted, according to existing corporate design rules or requirements and provides the highest grade of flexibility.