A plastic extruder is a machine used to create plastic products by melting and shaping plastic materials. It works by feeding plastic pellets into a heated barrel, where they are melted and then forced through a shaped die to form continuous profiles, such as pipes, sheets, or films. The process of extrusion allows for efficient mass production of plastic items, making it a popular choice in various industries. After the plastic is shaped, it can be cooled and cut into desired lengths, ready for further processing or use in products like packaging, automotive parts, and construction materials.