Our “Posi-Melt”TM Screw for Extrusion Adds a higher degree of homogenization to the melt pool through our very effective Distributive/Dispersive “XLA” mixer that works by forcing the polymer to change direction numerous times over a short axial distance and by Adding extensional strain to the Polymer by forcing the material to cross over a shallower land multiple times for added shear. A positive pumping angle and major flight OD wiping action assures a low pressure drop for high throughput yet pressurizes the channels for positive displacement for melt cleaning purposes. The design is very versatile, rows can be added, the number of slots determined and the clearance between the barrel ID and the Mixing Land can be changed to suit the polymer family.
In order to compete with the best parallel barrier designs in the world for output, we designed our own High Output “Posi-Melt”TM screw that utilizes a unique barrier section that is similar to the Mallifer concept only that our barrier starts on the trailing edge of the primary flight and catches up to the same flight downstream on the leading edge. Forcing the polymer over a barrier land increases the likelihood that each pellet will be thoroughly melted. The “MB-XLA” design shown below is used in applications where there is a need for High Output.