(1) The beating degree of each layer of slurry varies greatly. Influencing the water content of the slurry layer is inconsistent, the blistering part generally appears after passing the nip between the two slurry layers with widely different beating degrees. Treatment: control the beating degree of each slurry layer within 10SR, or increase the difference between the internal and external water levels in the slurry layer with high beating degree, and strengthen the dewatering capacity of the vacuum suction box;

(2) Improper adjustment of the line pressure of the roll. Treatment: Properly increase the linear pressure of the front roller in the foaming area, and reduce the linear pressure in the pressure zone of the foaming area;

(3) When the amount of pulp on each net, the liquid level of the pulp on the net, improper control of the water level difference between the inside and outside of the net, and the vacuum of the vacuum suction tank are too low, so that the moisture content of the wet paper sheet formed by each pulp layer is very different, the Will produce bubbles. Treatment: adjust according to the situation;

(4) Dirty or oil lumps in the mesh and wool layouts cause local dehydration and poor air permeability, causing air between the felt and the paper sheet. Moisture is not discharged well. In this case, blistering occurs at the preload. Treatment: cleaning copper net (plastic net) and felt;

(5) When there are dents on the roll or mesh surface, it will bring in excessive air and water, and will form bubbles after pre-pressing. Treatment: replace the roll or net;

(6) When the suction roller of the roll roll is partially jammed, the water retaining cloth is not flat or there are holes, the pressed water causes the wet paper sheet to "regain moisture" phenomenon, destroying the local interlayer bonding, and it will occur in the back pressure zone. Vapor bubbles, embossing in severe cases. Treatment: cleaning, adjusting the water-absorbing blade or replacing the water-retaining cloth; adding a reverse suction vacuum water-absorbing box after each net cage roll can reduce the moisture of each layer of wet paper, which can reduce blistering and embossing.

(7) The drying temperature curve of the drying cylinder is not adjusted well, the temperature of the drying cylinder rises sharply, and the water vapor generated inside the cardboard cannot escape quickly, and stays between the paper layers with weak fiber binding, causing the delamination of the cardboard. Treatment: Adjust the drying temperature curve of the drying cylinder. The temperature of the first two drying cylinders should not be too high, generally 90 ~ 95 ℃. Later, it will gradually increase to 120 ～ 125C.

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