The plastic extrusion process is a high volume process that is used to produce various types of plastic components such as: seals, wires, custom profiles, heat sinks, construction and building material, special cross sections, gaskets, sheets, pipes, thin films, rods, tubes, laundry tubs and hose pipes, etc. There are various types of plastic materials that can be used for extrusion such as: acrylic, polyurethane, polyamide, fiberglass, ABS, PVC, polyethylene terepthalate glycol, butyrate, nylon, polycarbonate, polyethylene, PTFE, polypropylene, polystyrene and urethane.
The process of plastic extrusion is relatively simple as pieces of plastic or plastic pellets are placed into a long holding chamber which is then heated to melt the plastic. After it is heated, the plastic is forced through an opening at one end of the chamber called a die. When the plastic comes out of the device it is formed to the shape of the die. The plastic extrusion is then cooled and cut to the desired size according.
There are also several types of plastic extrusion processes such as: dual extrusion, reverse extrusion, cable extrusion, film extrusion, sheet extrusion, and pipe extrusion, etc. When extrusion is done at high temperatures, complex and intricate shapes with thin wall sections can be produced. The dual extrusion process is used to extrude materials that have different degrees of hardness.
A new type of plastic extrusion involves the use of soy protein and soy oil. When these substances are extruded they form a plastic which is similar to commercial petrochemical-based polymer plastics. This type of plastic is biodegradable and fire resistance and is also being tested as agricultural mulches and as sheeting for greenhouses and other types of growing operations.
There are certain standards that have to be met by plastic extrusions whenever the finished products are going to be used in the consumer and industrial fields. You must take care while extruding plastic into a desired shape that the dies used in the process are of high quality. In fact, quality checks must take place frequently while extruding plastics.
Good extrusion machinery, an accurate die, and skilled manpower ensure that the extruded plastic components are of consistent quality and are without defects such as tearing and necking. Extruded plastic parts may have small amounts of flash material that need to be trimmed after the process is completed.