Магистерская диссертация тема работы Разработка цифрового двойника технологического процесса с использованием производственных данных

1.2.1 Single screw extruder

The single screw extruder is used to mix, plasticize the raw materials, and convey the product out of the extruder. It is made up of two separate screws, located one after the other.

The single screw extruder is composed of 2 zones:

80

• 
  The feed section feeds the plastic feedstock from a hopper to the barrel. This section is cooled. The feed screw has four functions: feeding, melting, mixing, and pumping.
  

• 
  The second screw, located in the barrel, pumps the material to the die. The barrel is heated, the number of heating zones, and, therefore, the number of heaters is determined by the L/D ratio.
  

1.2.2 Twin-screw extruder

The twin-screw extruder exploits the mechanical forces created by two screws rotating in the same direction in a barrel previously heated. The extruder screws are used to mix, plasticize, degas the raw materials introduced inside the barrel, and convey the product out of the extruder.

The twin-screw extruder is composed of 4 zones:

• 
  Feeding area: transport elements (they are used to moving along the extruder the raw materials and the product at the viscous state).
  

• 
  Melting area: mixing elements.
  

• 
  Degassing area: transport elements.
  

• 
  Thrust area: transport elements, used to created pressure.
  

1.2.3 Gear pump with gear reducer

The pump is specially designed to provide high reliability and exact dosing of the melt delivered to the die. It provides a low-pressure fluctuation.

1.2.4 Filtration

The filtration system is to remove the not molten gels and dirt and to provide clean melt to the die to achieve the optical properties of the film and less break film during production.

The molten polymer coming out from the extrusion system is passed through the pleated candles by maintaining the inlet pressure at the inlet of the filter.