Extrusion profiles are a method of continuous plastic deformation to form new shapes and sizes of plastic that do not include sheets and firms. The molten polymer is driven through a metal die-cut into the required final article's linear form (channel, tube, etc.). The molten polymer is pulled to the desired thickness in the air as it exits the die. The object is then chilled and formed in a water bath under a vacuum by a forming/sizing collar.
The plastic extrusion process is a quick and effective way to make continuous forms of various lengths. Large quantities of products may be produced with minimal waste. Complex forms with varied thicknesses, textures, and plastic colours may be created.
Is the Plastic Extrusion Process Beneficial?:
- Parts are comparatively low in cost.
- Operational flexibility
- Because the material is still hot after extrusion, post-processing changes are simple.
- The surface finish attained is satisfactory.
- Large-scale production
- There are many different sorts of raw materials that may be used.
- Mixing is excellent (compounding).
- Cold extrusion yielded good mechanical characteristics.
Different Types of Plastic Extrusion Processes:
- Cold Extrusion: The material to be ejected is well below the temperature of recrystallization.
- High-Temperature Extrusion: The material to be projected is above the recrystallization temperature.
- Forward Extrusion: The most frequent extrusion procedure is direct extrusion, often known as "forward extrusion." A ram or screw pushes the billet through the die. Between the ram and the billet is a reusable false block that keeps them apart.
- Backward Extrusion: Backward extrusion is a technique for creating hollow components with a closed end that involves pressing a smaller-diameter punch into the slug and allowing the metal to flow around and back up the punch. The hydrostatic pressure of a fluid on all sides of the billet is used to drive the billet through the die in hydrostatic extrusion.
