Toilet Paper Machine Process Control Description
Our Tissue Paper Machine plays a key role in the tissue paper production line. This paper making machine starts with the stock preparation system. The fan pump uses variable frequency control. The stock pipe from the fan pump to the machine chest pump has an electromagnetic flow meter and a consistency transmitter to control stock basis weight and consistency automatically. In the approach flow system, the stock pipe has an automatic control valve, consistency control system, and electromagnetic flow meter. The white water tank before the machine chest pump has a level gauge to control the water supply valve. The machine chest pump is interlocked with the pressure screen. If the pressure screen is not running, the machine chest pump cannot start. The start and stop of the machine chest pump and pressure screen are interlocked with the basis weight valve. The headbox has a pressure sensor connected to the DCS and interlocked with the dryer speed. According to the set jet-to-wire ratio, the headbox pressure controls the machine chest pump speed. This design makes our Tissue Paper Machine stable and reduces manual work. As a key part of paper mill machinery, this Tissue Paper Machine helps mills improve efficiency. Our paper mill equipment also includes the wire and felt section, forming section, dryer section, and reel section. The complete paper production line can work automatically.
In the wire and felt section, wire tensioning and breast roll lifting are electrically controlled. There is also a wire and felt deviation alarm. The high-pressure showers for the wire and felt use variable frequency control for the required pressure. The oscillating speed is synchronized with the forming roll speed. When the wire or felt makes one full turn, the shower pipe moves a set distance. When the paper machine speed is below a set value, the high-pressure pump stops and the oscillating device stops. When the machine speed rises to or above that value, the high-pressure showers for the wire and felt can open. The high-pressure stroke is twice the nozzle pitch, and the step length is adjustable. The drive uses a servo motor for reciprocating movement. The moving speed is linked to the wire running cycle. Wire and felt tensioning can be controlled on site. Between the forming section and the dryer section, the dryer drive and the forming roll drive share power distribution. When any doctor blade on the dryer surface is closed, the oscillating device runs automatically. The reel section has a reel length counter. According to the set length, it calculates the reel length and gives an alarm. The lubrication system has five oil lubrication points: one for the dryer gearbox, two for the dryer bearings, and two for the vacuum suction rolls. Each lubrication point has a flow switch and a flow meter. The flow switch is interlocked with the dryer motor. When the flow alarm is not cleared for a set time, the paper machine stops automatically. The oil station also has oil pressure and oil temperature display and alarm systems, including a preheating device and pump switching function. These features make our Tissue Paper Machine a reliable paper manufacturing machine.
The steam and condensate system has a steam flow meter on the main steam pipe. The signal goes to the operation screen to show instantaneous flow, total flow, temperature, and main pipe pressure. The system has pressure compensation and temperature compensation. The signal goes to the DCS. The dryer inlet steam has a pressure transmitter to control inlet steam pressure. The signal goes to the DCS to calculate the pressure difference. The condensate tanks have level gauges and automatic drain valves. A condensate pump is installed after the condensate tank. The pump starts according to the liquid level. In the hot air system, the circulation fan uses variable frequency control and can be controlled on the operation screen. The exhaust fan adjusts speed automatically according to the temperature and humidity sensor signal. It can also be manual. The main heat exchanger outlet has a hot air temperature sensor. In the vacuum system, the turbine fan motor uses variable frequency control. The main vacuum pipe has a vacuum sensor connected to the DCS to control motor speed. In the white water system, the white water tank has a level gauge to control the white water pump speed automatically. The dilution water pipe has a pressure sensor to control the dilution water pump speed automatically. For compressed air, when the main pipe pressure is below a set value, the DCS screen shows the pressure and gives an alarm. When the pressure is below a lower set value, the machine stops immediately. These systems work together to keep the Tissue Paper Machine running efficiently. As a pulp and paper machinery supplier, we also provide complete paper mill machine and turnkey paper production line services.
Besides the Tissue Paper Machine, we can supply production lines for other paper grades, such as cultural paper, corrugated paper, and linerboard. Our paper mill plant machinery includes pulpers, cleaners, pressure screens, headboxes, forming sections, press sections, dryer sections, calenders, and reel machines. We can design a complete paper processing line according to customer needs. Welcome to contact us for more information.
Email: leizhanworld@gmail.com
