In the most common term, it is considered to be the modification of plastic solid in shape which is later onwards altered into a specific shape which can be either converted or produced into a product that is easily usable by the common people.
Plastic-based extrusion is different from the food-extrusion machinery and is normally used in three most efficient processes of generating a plastic part. These processes comprise of injection molding, extrusion, and even blow molding. The best part about these processes is their uniqueness. For many, extrusion is a kind of process which is normally continuous, while the molding of injection is discontinuous, and blow molding is also supposed to be continuous.
Due to these dissimilarities, each process is equipped with a various set of demands and challenges, however, in this blog, we shall be only talking about plastic extrusion. A majority of the people don’t understand the idea that extrusion is a process of changing or altering a plastic in solid form, powder or pellet into a melted form where it is released through a die and formed into a different shape. This shape is then later onwards surpassed through different secondary operations where it is then cooled and then cut respectively.
Extrusion in this regard can be easily designated into different sub-processes which are known as cast film, sheet, and pelletizing. These processes are also used in the food extrusion machinery and the major outputs from all of these processes contain the following:
Each and every sub-process is normally different demanding various extrusion, dies, or downstream equipment to generate the accumulated product. Regardless of the process, each and every sub process has an individual component in between, which is an extruder.
The job of an extruder is to alter or modify the solid plastic mass or feed stock into a much melted form. In order to achieve this, there are two essential extruder based technologies that are equally important. These technologies are a twin and a single screw.
The single screw extruder is mostly commonly considered for enhancing the extrusion technology and has all the capability in the world to generate a vast range of polymer and its types which can be effectively used and applied in the most conventional extrusion processes.
The technology for twin screw extruder is normally broken to add co-rotating and counter-rotating. The counter-rotating twin screw extruder normally uses two different types of screws that rotate on the opposite side of each other. Be it twin screw or a single; these screws are created to achieve a specific task – to ameliorate a solid mass into the melt. This process of transformation is the starting point of the extrusion and has a significant impact on the entire process.