(a) The degree of beating of the slurries in each layer varies greatly. Affecting the consistency of slurry moisture, the foaming site generally occurs after the nip between two pulp layers with widely varying beating degrees. Treatment: Control the degree of beating of each pulp layer within 10SR, or increase the difference in water level between the inside and outside of the pulp layer with high beating degree, and strengthen the dewatering capacity of the vacuum suction box;
(b) Improper pressure regulation on the roll line. Treatment: Appropriately increase the line pressure of the foam roller in front of the foaming area and reduce the foaming area. Pressure in the nip
(3) The on-line slurry level, the paste level on the Internet, the improper control of the water level inside and outside, the vacuum level of the vacuum suction box are too low, and the moisture content of the wet paper sheets formed in each slurry layer is very different. Bubbles will be produced. Processing: adjust according to the situation;
(4) Dirty or oil blocks in the net department and the wool layout department cause local dehydration, poor air permeability, and air between the felt and the sheet. Water does not drain well. This situation mostly produces blisters at the pre-pressure. Treatment: cleaning copper mesh (plastic mesh), felt;
(5) When there is a dent in the roll roller or mesh surface, excessive air and moisture will be brought in, and bubbles will be formed after being pressed. Treatment: Replace roll or mesh;
(6) When the suction roller suction blade partially jams, and the water blocking cloth is uneven or has a hole, the pressed water will cause the wet paper sheet to “recover†phenomenon, destroying the local interlayer bonding, and will be generated in the downstream pressure area. Bubbles, embossed when severe. Treatment: Wash, adjust the suction blade or replace the water retaining cloth; add a suction vacuum suction box behind each mesh cage roll, which can reduce the moisture of each layer of wet paper sheet, which can reduce the foaming and embossing phenomenon.
(7) Dryer drying temperature curve is not adjusted properly, dryer temperature rises sharply, water vapor generated inside the cardboard cannot escape quickly, and stays in the weak paper binding layer, causing delamination of the cardboard. Treatment: Adjust the dryer drying temperature curve, the temperature of the first two drying cylinders should not be too high, generally 90 ~ 95 °C is appropriate. Later gradually increased to 120 ~ 125C.
(b) Improper pressure regulation on the roll line. Treatment: Appropriately increase the line pressure of the foam roller in front of the foaming area and reduce the foaming area. Pressure in the nip
(3) The on-line slurry level, the paste level on the Internet, the improper control of the water level inside and outside, the vacuum level of the vacuum suction box are too low, and the moisture content of the wet paper sheets formed in each slurry layer is very different. Bubbles will be produced. Processing: adjust according to the situation;
(4) Dirty or oil blocks in the net department and the wool layout department cause local dehydration, poor air permeability, and air between the felt and the sheet. Water does not drain well. This situation mostly produces blisters at the pre-pressure. Treatment: cleaning copper mesh (plastic mesh), felt;
(5) When there is a dent in the roll roller or mesh surface, excessive air and moisture will be brought in, and bubbles will be formed after being pressed. Treatment: Replace roll or mesh;
(6) When the suction roller suction blade partially jams, and the water blocking cloth is uneven or has a hole, the pressed water will cause the wet paper sheet to “recover†phenomenon, destroying the local interlayer bonding, and will be generated in the downstream pressure area. Bubbles, embossed when severe. Treatment: Wash, adjust the suction blade or replace the water retaining cloth; add a suction vacuum suction box behind each mesh cage roll, which can reduce the moisture of each layer of wet paper sheet, which can reduce the foaming and embossing phenomenon.
(7) Dryer drying temperature curve is not adjusted properly, dryer temperature rises sharply, water vapor generated inside the cardboard cannot escape quickly, and stays in the weak paper binding layer, causing delamination of the cardboard. Treatment: Adjust the dryer drying temperature curve, the temperature of the first two drying cylinders should not be too high, generally 90 ~ 95 °C is appropriate. Later gradually increased to 120 ~ 125C.
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