The Sheet Extrusion Process
There are three main parts to the sheet extrusion line:
1. The extruder
The raw materials are first fed into the hopper, which feeds into the heated barrel via the feed throat onto a rotating screw. The plastic is conveyed forward by the screw, which melts in the heated barrel, mixing together.
The pressure increases, which forces the melt to flow into the die for the next stage of the process. As the plastic sheet we produce is made up of three layers, three extruders feed the melts for each layer into a single die, a process known as co-extrusion.
2. The die
The die shapes the melt into a molten flat sheet, which then leaves the die at a controlled thickness and flow rate.
3. The downstream equipment
The downstream equipment pulls the plastic sheet from the die and adjusts the thickness of the sheet. A finish is then imparted before the plastic sheet is cooled. After cooling, the sheet can then be trimmed and cut to the required dimensions.
The result is durable, quality plastic sheet with a high IV value and lower carbon footprint, which can be supplied in large commercial volumes with high-speed turnaround times.