Surface glue DCS control system
Principle of sizing: The original starch is subjected to processes such as "oxidation reaction", "cooking gelatinization", "dilution adjustment", and "addition of additives" to produce an emulsion with a solid content of over 10%, which is continuously supplied to the surface sizing machine through the sizing supply system. The surface glue machine continuously, uniformly, and stably applies emulsified glue onto the surface of the paper. Through a series of physical processes such as infiltration, penetration, and compression, a very thin waterproof layer is formed on the surface of the paper, greatly improving the waterproof resistance of the paper. At the same time, under the action of the glue and glue machine, the bonding strength between fibers and the tightness of the paper are increased, thereby improving the technical indicators such as the transverse ring pressure index and longitudinal fracture length of the paper.
1、Gel preparation system
This equipment consists of a high-temperature water tank, a glue soaking tank, a glue boiling tank, a glue dilution tank, a glue storage tank, a glue supply tank, an inter tank pump, electric/manual valves, pipelines, electrical control systems, etc. Raw starch is used to prepare emulsion glue with a certain solid content through glue preparation tanks and glue dilution tanks. The glue storage tank and glue supply tank ensure the continuous, uniform, and stable use of the glue applicator.
2、DCS electrical control system
This system consists of an upper computer, DCS central control unit, electric actuator valve, and peripheral control circuit. Through the friendly interface of the upper computer, the temperature of the high-temperature water tank, adhesive preparation tank, dilution tank, and supply tank is displayed and controlled, and the liquid level of the high-temperature water tank, adhesive preparation tank, dilution tank, and supply tank is displayed and controlled. Automatic control of the glue pumps for high-temperature water tanks, glue preparation tanks, storage tanks, and dilution tanks, displaying the temperature and liquid level of the storage tanks. Users can monitor and control the temperature, liquid level, and flow status of each step of glue preparation in real time, and automatically control the on/off of pumps between tanks to ensure the continuity and stability of glue preparation.
3、To further improve the reliability and stability of the equipment, the signals from the temperature and liquid level sensors in this system are sent to the DCS through signal isolators. At the same time, the upper computer is equipped with a purification power supply and a 1.5-hour UPS uninterruptible power supply to prevent damage to the computer system in the event of a sudden power outage in the grid
