Compact one-component injection system
RTM on a Laboratory Scale
Resin transfer molding (RTM) is a process for forming large glass or carbon fiber-reinforced parts. It is used in aircraft engineering, boat building and the production of wind turbine blades. To be able to apply the technology for small and medium-sized parts in research, and on a small and pre-production scale, Tartler GmbH, Lützelbach, Germany, has developed a compact one-component injection system. The system processes Hexflow RTM 6 premixed epoxy resin (EP) (manufacturer: Hexcel Corporation, Stamford, USA) as prepolymer and is planned for volume outputs of 0.05 to 1.0 l/min. It has its own heated material tank with integrated stirrer and infinitely variable volume flow control. The holding pressure can be increased to 60 bar to optimize resin impregnation and mold filling.
The heated five-liter tank of the RTM metering unit keeps the temperature of the viscous prepolymer constant at between 120 and 160°C. Thanks to the recirculation function, the system is checked before injection and then the unit is cleaned. The infinitely variable volume flow control unit increases flexibility by permitting output of different amounts of material at different times. The standard equipment of the system includes mold pressure monitoring – it permits control of injection pressure and logging of the casting process with all relevant parameters. The operation, control and process visualization take place via a touchscreen.
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