Designing a new plastic extrusion generally takes a few steps, the exact process required will differ in each case. As a guide, the following steps will be followed in the production of a new plastic profile.
- Define the use – in what industry and to what purpose will be extrusion be put. The size and shape required and transportation method must also be considered. G.James make products up to 100mm in Circumscribing Circle Diameter (CCD).
- Material selection – Use and condition dependant – factors such as weathering, heat and chemical exposure must be considered.
- Extrusion design – finalised using constraints and purpose.
- Approval and sign off.
- Die tooling – the longest part of the process.
- Die trial, assessment and quality test.
- Extrusion run.
The raw materials come in pellet form and are control fed through a hopper into a spiralling ram or screw. The pellets are heated, mixed and compressed as they are fed through the ram, then forced through the die into a final shape. After the gasket is extruded, it is immediately cooled in chilled water, and then dried before being cut into designated lengths and boxed, or rolled onto a spool.