| 摘要 |
A device for measuring the water permeability of a material (2) moving along a determinate travelling direction (D) is provided with a nozzle (5), through which a determined water flow (Pu) flows for impinging a surface portion (9) of the material (2); and with first and second reading heads (6a, &bgr;b) of a parameter indicative of the quantity of water present in the material (2) arranged upstream and downstream of the nozzle (5) along the travelling direction (D) of the material (2), respectively.
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