(1) The medium-high error of the press roller. Calculating the medium-to-high volume of the compensating roller, or the grinding of the medium-high curve shape of the press roller, is not correct, resulting in uneven contact between the two rollers. In the face of this phenomenon, consideration should be given to re-grinding highs.

　　(2) Change in pressing conditions. The middle height of the press roller only corresponds to a certain line pressure. During the production process, the pressure of the press line must be properly adjusted and changed due to the change of the process conditions, the newness of the press felt and the temporary requirements in the operation. Once the load of the press roller changes, the original medium-high amount of press can not be adapted accordingly, resulting in non-uniformity of the press roller, causing uneven dewatering of the paper web.

　　(3) Changes in the properties of the press felt. In production, after the blanket is used for a period of time, the full thickness of the blanket is often inconsistent due to uneven wear, or the blanket is partially blocked by the filler, resulting in reduced compressibility of the blanket, and bending and localization of the standard line of the blanket due to defects or improper operation on the device. Relaxation results in uneven dehydration of the blanket.

　　(4) The uneven quantification of the net part makes the moisture distribution in the pressed paper sheet uneven, which will cause the outlet water to be uneven. This situation should be re-network department to find the cause and solve it.

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