What are the main aspects of the OPP plastic bag production process?

What are the main aspects of the OPP plastic bag production process? There are mainly two types of high-pressure tube method and kettle method. From the current development situation, in order to reduce the reaction temperature and pressure, the tubular process generally uses a low temperature and high activity initiator initiated polymerization system, using high-purity ethylene as the main raw material, propylene/propane, etc. as a density regulator, and using a high activity initiator for polymerization at about 200 ℃ to 330 ℃, 150-300 MPa.
The molten polymer that initiates polymerization in the reactor must undergo high pressure, medium pressure, and low pressure cooling and separation, and the high-pressure circulating gas must undergo cooling After separation, it is sent to the ultra-high pressure (300MPa compressor inlet). After cooling and separation, the medium pressure circulating gas is sent to the high pressure (30MPa compressor inlet), while the low pressure circulating gas is sent to the low pressure after cooling and separation (0.5MPa compressor is used for recycling, while molten polyethylene is separated by high pressure and low pressure and sent to a granulator for water granulation. During granulation, enterprises can add appropriate additives according to different application fields, and the particles are packaged and shipped out of the factory.).
Finally, in terms of the use of OPP bags: mainly used for agricultural films, industrial packaging films, pharmaceutical and food packaging films, mechanical parts, daily necessities, construction materials, wires, cable insulation, coatings, and synthetic paper.