| 摘要 |
A method of maintaining the permeability of felts (1) in paper board and like machines comprises the steps of monitoring the permeability of the felt (1), and bringing into operation apparatus (5) for directing at the felt a spray of liquid for reconditioning the felt (1), when the monitored permeability monitored by means (11) reaches a first predetermined value and terminating the operation of the apparatus when the permeability reaches another second predetermined value higher than the first value. |
