To answer these questions the Fraunhofer ITWM starts by simulating the complete Spunbond plant with the commercial Computational Fluid Dynamics (CFD) solver ANSYS FLUENT. Next, the scientists from the Fraunhofer ITWM use their software FIDYST (Fiber Dynamics Simulation Tool) to simulate the filaments in airflow. Analysis of the laydown on the conveyor belt is then provided by the simulation tool SURRO. After a reference case has been completely simulated and validated against the industrial partner's measurements, further experiments based on simulations can be computed.
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To optimize the Spunbond process the Fraunhofer ITWM analyzes the reference case and from this provides design proposals for modifications of the Spunbond line. Structural alterations, which would idle the production line for several hours, can then be tested by computer simulations. Parameters of the process can systematically be sampled to find optimal operating points for production. Material properties can then be predicted before the proposed changes are implemented. Typical problems arising in the upscaling of pilot plants can thus be reduced or completely avoided.
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The production of nonwovens takes place in three stages, although modern technology allows an overlapping of some stages, and in some cases all three stages can take place at the same time.
The three stages are:
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