Beaten pulp system control
The closed-loop control of soft measurement of refiner beating degree is the core of the refining system which is a control software module successfully developed through HollySys’ implementation of nearly a hundred refiners. The production lines produce special paper types, high-quality office paper, and different types of packaging paper, receiving good feedback from users.
The DCS of the beatenpulp production lines optimises automation control, is able to stabilise indicators such as beating quality, stabilise pulp beating degree, and wet weight (Ww), ensuring the fulfilment of physical indicators such as paper evenness, breaking length, tightness, gloss, and tear.
DCS control characteristics:
Control solution for headbox
Headbox control includes air cushion headbox control, diluted water strength headbox control, and wet-end water and vacuum control solutions.
Control solution for dryer segment
During the drying process of the paper machine, the drying process will be divided into low-temperature, mid-temperature, and high-temperature sections based on the drying curves required according to the different paper types. The control system is temperature-controlled based on the designed temperature curve. The reasonable drying curve design is able to improve the product’s physical indicators. The main controls include hot pump, ventilation, exhaust, heat retrieval, and fire-safety control.