Paper gypsum board non-stick paper and resurgence is what reason
Board ripples, pull ditch and other uneven phenomenon. The generation of such problems is related to paper indicators, process control and other issues.
First, the paper factor. The amount of moisture, is not uniform, so that the paper is tight, different thickness, different water absorption, where the water is large, wet expansion is small, small water, wet expansion, in the dry The area of ??serious contraction, and the surrounding areas of less dry dry shrinkage, which resulted in the expansion of the paper, contraction is inconsistent, and cause ripples or pull ditch.
Second, the problem of process equipment. The flatness of the molding platform is not enough or the adjustment is not in place, the same can cause the board uneven, this cause the problem is more concentrated, easy to find, but through the improvement of the process equipment to achieve the improvement of flatness of the board.
Third, material and material fluctuations are also one of the important causes of uneven board. Due to fluctuations in raw materials, additional materials, and fluctuations in the milling process, it is inevitable that changes in the coagulation time and lift of powder and slurry are inevitable, but if the fluctuation is too frequent or fluctuating, Resulting in the subsequent process of the process is difficult to timely adjustment and control, can also lead to board groove and other undesirable phenomena.
Face paper and gypsum core bonding bad, resulting in bare core or local non-stick paper problems. This type of problem with the face paper, raw material quality and drying and other production processes.
First, the paper's polish degree of Gray is too high, too high or too low water absorption, are likely to cause rapid loss of water, and lead to bad knot; Second, the raw material gypsum grade is too low, impurities or K, Na and other harmful impurities are too high, affecting the bonding of paper and gypsum core. Third, the construction of gypsum coagulation time is too slow, before entering the drying area failed to completely solidification or false coagulation phenomenon, resulting in the construction of gypsum is not fully hydrated, so that the dry sheet after the paper. Fourth, the molding, drying speed can not be adjusted with the face of the paper or slurry fluctuations, resulting in the breathability of protective paper, water absorption and drying speed of the uncoordinated, gypsum slurry coagulation time and molding speed of incongruity , Resulting in paper and gypsum core of non-bonding or sheet burned. Fifth, the slurry is too thin, uneven foam, dry sheet after the large pores or too concentrated and other reasons will cause paper, the core of the poor bond.
Sheet surface rub paper phenomenon.
The surface of the sheet to pick up the paper, that is, the appearance of the quality of the plate, but also to a certain extent, the strength of the plate and other inherent quality indicators have a negative impact, and this can not be ignored. The main factor affecting the surface of the sheet is the face paper.
The interlayer adhesion of the paper is poor and the moisture content of the paper is too high. During the process of forming the water, the interlaminar bonding force of the paper will be further reduced, and the relative movement between the sheet and the equipment and the sheet will be Will be due to mutual friction and produce rubbing phenomenon, serious, the paper produced by the paper will cause scratches on the surface of the plate, and lead to easy fracture and other serious quality problems. Therefore, the paper gypsum board production process should try to use moisture, water absorption and other indicators of the stability of the face paper.
