In electronics production, many surfaces are pre-treated with primers. These agents improve the adhesive properties of surfaces and coatings that are subject to heavy wear or are difficult to bond. The improved adhesion of adhesives or paints increases resistance to water and chemicals as well as corrosion protection and therefore product quality. Classic areas of application include bonding glass to plastic, metal to plastic, smartphones and tablets, AR/VR lens bonding, speaker bonding, sealing mobile devices and batteries.
Traditionally, primers are applied with a sponge, spray or by time/pressure contact dosing, depending on the degree of automation of a production process. However, manual application is rarely an option from a quality perspective. As automated processes predominate in the electronics and automotive industries, the question of the optimum dispensing method arises. The choice of dispensing system or method also determines process reliability, cost-effectiveness and product quality.
The application with the PDos X1 jet valve from perfecdos GmbH in Oberhaching has a high dosing volume accuracy - the repeat accuracy of the jet valve is generally 99%. In this dosing process, lines are created by placing one dot next to the other at a high frequency of up to 300 Hz. This makes it easy to program the dispensing system for ramps or curves, among other things. Jetting also eliminates the need for the adjustment stroke and the additional movement of the applicator, resulting in significantly shorter cycle times than with contact dispensing. Component and position tolerances are also less critical with this method. As the valve can be controlled directly from the system control, users have a high degree of flexibility with regard to the variety of assemblies to be produced. This is a key aspect, particularly in electronics production in Europe.
In addition, the process can be monitored using a light barrier. This is not possible with contact dispensing. Expensive optical process control must be used there. The laser light barrier from perfecdos monitors every droplet that passes through the barrier, even transparent, extremely small and/or extremely fast droplets. The sensors of the photoelectric sensor are cleaned automatically so that contamination does not cause any malfunctions.
"Precise contactless dispensing with the PDos X1 jet valve applies the primer where it is needed," explains Julian Greiner, Marketing & Sales at perfecdos GmbH. "This not only saves money while increasing product quality, but also reduces the health risk by avoiding overspray and thus lower investments in health protection are becoming increasingly important."
