The transmitter in the traversing sensor beams onto the running web. Due to its mass, the radiation reaches the receiver in a damped manner. The values of the transmitted and received radiation are calculated to obtain the weight per unit area. Mahlo uses a multi-channel receiver in which the incoming measuring radiation is distributed to different areas of the fabric surface. In this way precise values are obtained, no matter what position the fabric is currently in.
This method also solves one of the biggest problems faced by manufacturers of web-shaped goods such as hygiene fleece: measurement inaccuracies due to fabric flutter. Its sensor technology makes the Gravimat DFI immune to changes in the center of gravity. It measures precisely and unaffected by any changes in degree of dryness, density or thickness.
The Gravimat DFI does not require strong absorbers or highly radioactive sources. Nevertheless, the highest precision, speed and resolution are guaranteed. The sensor can be used for practically all nonwoven applications.
For non-woven fabric used for face masks, air permeability is of particular importance. After all, the wearer must be able to breathe easily. In this case, Mahlo combines basis weight measurement with an air permeability sensor, which can also measure on the running web with a light touch.