When compounding, the goal is to provide the polymer within specification to the forming process. That means that the polymer exiting the machine is the quality and uniformity specified and has the ideal flow and melt characteristics for that process. The steps in this process include feeding to the extruder, conveying the solids, melting the material, pumping and mixing. The screw may not be part of the feeding process, but is an essential component in the rest of the process.
The right screw design will result in a higher output rate, lower melt temperature, and a highly homogenized melt. The screw can be a certain pitch or angle, or have a specific length to diameter ratio. These variables and others affect the pressure, shear and feed rates.
The Polymers Technology Center has a large number of screw elements offering flexibility and allows us to process a broad range of materials and processes. Our engineering knowledge allows us to design the right screw for your manufacturing process.