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The typical manufacturing process for producing poly PP polypropylene granules generally includes the following steps:
Polymerization (Polymerization): The first step in making PP polypropylene granules is the polymerization reaction. Polymerization occurs by polymerizing propylene monomer (an olefin) in the presence of a catalyst to form polypropylene chains. Common polymerization methods include gas phase polymerization, solution polymerization and slurry polymerization.
Solution or slurry processing: After the polymerization reaction, the resulting polypropylene is usually in the form of a solution or slurry. At this time, subsequent processing is required to remove residual catalysts, antioxidants and other impurities. This can be achieved through steps such as washing, settling and filtration.
Dehydration: The processed polypropylene slurry needs to be dehydrated to remove water. This is usually done under vacuum conditions or by blowing with hot air.
Melt extrusion: Dehydrated polypropylene is usually in the form of pellets, but these pellets may not be uniform in size and shape. In order to obtain particles that meet the requirements, melt extrusion technology is usually used. In this process, polypropylene particles are heated to the melting temperature and then extruded through an extrusion mechanism to form uniform particles.
Pellets cutting: Extruded polypropylene pellets may form long pellets, which require a cutting process to cut them into the required length.
Pellet cooling and packaging: Cut polypropylene pellets need to go through a cooling process to ensure that they do not stick during the packaging process. Finally, the pellets are packaged into the final product, ready for shipment.
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