Efficient direct infusion and material degassing
The new TARTLER solution is therefore a pressure-controlled direct infusion system in which all pressure fluctuations caused by operation are automatically compensated. This applies to all system-typical influences – even those resulting from the different pressure resistances of different hose lengths or the height differences of a mold. This results in rapid, reliable and uniform resin delivery to the mold inlet and ensures that the full vacuum value is always present in the mold. As a result, TARTLER direct infusion offers the user many new approaches to process optimization. For example, by using faster hardeners, the curing time can be reduced and, thanks to the intelligent control of the pressure compensation, it can dose at a significantly higher flow rate – with the same infusion set-up. “The system requires an average lower volume flow than a bag-based infusion system or a standard infusion system, which always rely on the rapid supply of a lot of material, thanks to the continuous permanent supply of fresh material,” Davis says. It should also be mentioned that residual quantities of premixed resin masses from process bags or buckets, which are relevant for disposal, do not occur in the first place.
With TARTLER-style direct infusion, the user consequently receives a whole bundle of advantages. The process is safe and efficient, proves to be material-saving and cost-cutting – and optimizes vacuum infusion from the ground up. The next higher level of optimization in terms of low-waste material use and improved infusion and resin quality is made possible by using a T-EVAC series vacuum degassing station. These stations are installed upstream of the direct infusion: As an offline central station to supply several metering and mixing systems (manufacturer-independent) or as an inline system integrated directly into a NODOPUR from TARTLER. Before the actual processing, they free the epoxy or PU resins from air and moisture in a hermetically sealed vacuum process and bring them to the desired application temperature. In this way, only optimally conditioned material enters the infusion process, which has excellent properties for impregnating the fiber fabrics and does not cause any process disturbances.
The offline T-EVAC is available in two variants: For direct connection to dosing systems or with an additional buffer tank, which considerably reduces refilling times. In the process, this tank is located between the degassing station and the dosing system (e.g., a NODOPUR VS AR VF Infusion). “It is used for safe temperature-controlled storage of the degassed material under full vacuum and rapid filling of the metering systems,” says Olav Davis. In the inline solution, the T-EVAC is integrated into the dispensing system. System filling and material degassing take place in one step, and machine refueling can be synchronized with the application. The inline T-EVAC requires less personnel and floor space. When operated with only one dosing/mixing system, it is also more cost-effective than the offline variant.