| 摘要 |
An instrument for measuring the air flow through a papermaker's felt at a location in registry with a vacuum box. The instrument includes a housing having a generally rectangular discharge outlet which is placed in contact with the felt in registry with the slot of a vacuum box. The housing includes an inlet chamber which houses an anemometer, and as the air is drawn into the inlet chamber by virtue of the vacuum created in the vacuum box, the air flow will rotate the anemometer vanes. A sensor produces an electrical signal in accordance with the speed of rotation of the anemometer and the signal generates, through suitable circuitry, a visual readout of the air flow. The device can be used to measure the permeability of the felt, as well as the air flow through the vacuum box.
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