An optimal drying process is important in electronics manufacturing. Depending on the chemicals used in their materials, electronic products have different requirements as regards reliable hardening during manufacture. The RDS drying systems from Rehm Thermal Systems are configured individually according to the customer’s requirements. Different basic physical principles of heat transfer are used here to make drying processes as efficient as possible.
For all these applications, the company offers a wide range of innovative drying and curing processes to meet every requirement. Below are the various systems with individual advantages in terms of product requirements and space requirements.
Vertical dryer Alteco
One of the company’s latest developments is the vertical drying system Alteco, which offers maximum performance with minimum space requirements. All industries that utilise coating processes and work with sensitive flat assemblies with protective coating benefit from this system. In addition to the best temperature profiling possibilities and low energy consumption, the minimum space requirement was also successfully achieved in the implementation of this system. Thanks to vertical transport, this solution replaces a comparable 40-metre-long horizontal dryer with a system length of just 4 metres. With this innovative system concept, valuable space in the production hall can be saved, existing resources can be optimally used, and daily production can be optimised.
Vertical dryers save space on the surface but require sufficient height clearance in the production facilities. In addition, the natural thermals in a vertical process chamber are crucial for the process, as heat always rises. If very small tolerances in the reproducibility of the temperature-time profile are required, it may be technically more sensible to thermally process the products in a horizontal process chamber. With the RDS 45000 meander system, Rehm has developed a special solution that enables equally long product dwell times at a productivity of 3.5 units/min in a horizontal position. The products meander in 13 tracks through the process chamber, which has a maximum temperature of 130 °C and is equipped with 18 heating zones. The meander system also features seamless traceability: the barcode of the individual assembly is read in, which enables an exact assignment of the process-related data.
Continuous dryer Pramo
In the continuous dryer Pramo, the assemblies are transported through the system on goods carriers with “shuttle” supports. Within the dryer, they pass through several zones in which they are heated up to the appropriate temperature and then maintained at the set temperature for the drying/hardening process. The maximum temperature in the dryer is 150 °C. In order to harden the materials according to the specifications, the cycle time can be adjusted according to the necessary dwell time of the assemblies in the drying system. The flexible goods carrier receptors are interchangeable, which means various assemblies and also special forms can be guided safely and reliably through the system at any time.
RDS Lacquer dryer
The optimum heat management of the RDS lacquer dryers with upper and lower heaters works with infrared radiation (IR) and/or convection to dry the various materials reliably. By implementing these two heat transfer processes, the systems are optimally designed for the processing of lacquers and castings containing solvents. The exceptional thermal insulation of heating zones and the individually adjustable temperatures allow for optimum profiling of your drying processes – which are perfectly adapted to the requirements of the products. In the drying phase, the temperature is maintained until the material has hardened completely. A stronger convection is needed for this, as the evaporating solvents need to be discharged. In the subsequent cooling phase, the components are cooled down gently. Despite this, the component still has an outlet temperature of around 60 °C. A separate air or water-cooled cooling unit is available as an option and can be used to achieve significantly lower temperatures.
Declining cycle times during the coating process today require faster hardening times, which can be optimally implemented with the help of UV drying systems. Rehm Thermal Systems is responding to this trend by developing the new RDS UV, a compact dryer, especially for hardening UV coatings and UV adhesives. With the RDS UV, the company offers a flexible and reliable dryer that makes the hardening process for UV coatings uncomplicated. Thanks to modern UV lighting systems, the system is ready for operation within seconds and thus much more energy-efficient than comparable systems.