Process of Profile Extrusion
A wide range of special profile extrusion equipment are used to carry out this process effectively. In this process, first the plastic (pellet form) is fed into the machine hopper / extruder. Along with this, the material is constantly conveyed in the forward direction by the way of rotating screw which is placed inside the heated barrel that is being regularly softened by friction as well as heat.
Then, the softened plastic is thrown out via a die, straight in the cool water that solidifies the product. From this point, it is conveyed to take-off rollers that actually pull the softened plastic from the die. The die is basically a metal plate which is placed at the extruders' end with a section that is cut out of its interior. This cutout along with the speed of take-off rollers are the two major factors that determine the final cross-section of manufactured product.
Typical Raw Materials For Plastic Profiles- HDPE (High Density Polyethylene)
- LDPE (Low Density Polyethylene)
- LLDPE (Linear Low Density Polyethylene)
- PETG
- Flexible PVC
- Butyrate
- Polypropylene
- Polystyrene
- ABS
The only main disadvantage of the profile extrusion is the limitations in the design possibilities, which is due to the linear nature of the process. It has various advantages as well that are as follows:
- Equipment widely available in all geographical areas
- Relatively low tooling costs
- Inexpensive process
- Product combinations possible
- Design freedom
There are number of applications where the process of profile extrusion is extremely useful. Also, there are many design possibilities with the use of this process. Typical applications and design possibilities of the profile extrusion process are as follows:
- Windows profile
- Sealing sections
- Modular drawer profiles
- Decorative trim
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