Atmospheric Pressure / Vacuum
Application and Requirements
Depending on the application, requirements and component geometry, a dispensing, preparation and feeding process may be more effective under atmospheric conditions or under vacuum.
Dispensing under atmospheric conditions is standard nowadays and sufficient for many applications. As workpieces become smaller and smaller, geometries more complex and quality requirements increase, vacuum solutions are becoming more popular.
However, despite these growing requirements, numerous different bonding and potting tasks can still be reliably performed under atmospheric conditions with the required quality. Depending on the task and requirements, different system concepts can be used.
Air bubbles in the potting material as well as in small gaps can cause considerable problems. In order to ensure absolute bubble-free conditions, the entire preparation and feeding process must take place in a vacuum. Optionally and depending on the component, the dispensing process can also be carried out under vacuum. The further the air pressure is reduced, the longer the evacuation takes and the more time and energy is required. For this reason, the vacuum should be specifically adapted to the task at hand. In addition, it should be noted that not every component is suitable for a strong pressure reduction. The vacuum process is ideal for working with moisture-sensitive resins. Processing under vacuum effectively excludes an undesired side reaction of the potting medium or the absorption of air. However, concerns about a technology that is difficult to control as well as high costs are no longer justified here. Modular concepts offer, among other things, interesting and economical entry-level solutions.