The NPI applies plastic films in the civil engineering sector for many purposes, including for sealing, soil protection and groundwater management. A few years ago, the NPI manufactured and installed a film construction at a railway line in The Hague.
LDPE film has been applied under a new constructed railway track. The film panels were welded together on site and a closed basin was created by means of this LDPE film, which was hereafter filled with soil. The basin forms a barrier to the groundwater, thereby reinforcing and protecting the soil. Soil erosion is greatly reduced in this way. In addition, the film provides damping; it helps to reduce the vibration of trains.