Basic plastics within the plastics industry utilize synthetic resins as their primary raw material and are broadly classified into general-purpose plastics and engineering plastics.
Common Categories: Polyethylene (PE), Polypropylene (PP), Polyvinyl Chloride (PVC), Polycarbonate (PC), etc.
Core Processes:
Injection Molding: Molten plastic is injected into a mold; after cooling, the mold is opened to release the part (e.g., mobile phone cases, building blocks). This process is characterized by high production volume and high precision.
Extrusion Molding: Continuous extrusion is used to form profiles (e.g., pipes, plastic films).
Blow Molding: A plastic preform is inflated to create hollow products (e.g., mineral water bottles). Advantages and Disadvantages: Lightweight, corrosion-resistant, and low-cost; however, these materials are difficult to biodegrade and prone to aging.