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[1] [2] These microplastics are made primarily from polyethylene, polypropylene, polystyrene, polyvinyl chloride, and other plastics or synthetic resins. [3] Nurdles are the building block, via plastic extrusion or injection molding, for items for everyday life including plastic water bottles, containers, and bags. [4] An example of nurdles
The company started producing plastic pellets for sale in 1982 and expanded the product line of various types of plastic resin products, including expanding factories and building infrastructure for the complete petrochemical industry. [2]
Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene . Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar .
Biodegradable pellets are made of various types of resin, often developed for the agricultural industry, and better makes are certified as compostable. Commonly used plastic resins include polylactic acid or polylactide (PLA) which is based on renewable materials like corn products and a molecular formula of (C 3 H 4 O 2) n. [4]
The feeds may be pellets, powder and/or liquids, but the product is usually in pellet form, to be used in other plastic-forming processes such as extrusion and injection molding. As with traditional extrusion, there is a wide range in machine sizes depending on application and desired throughput.
Processed Taconite pellets as used in the steelmaking industry, with a US Quarter shown to scale. Pelletizing iron ore is undertaken due to the excellent physical and metallurgical properties of iron ore pellets. [1] Iron ore pellets are spheres of typically 6–16 mm (0.24–0.63 in) to be used as raw material for blast furnaces.
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