Uniloy Reciprocating Screw Series (UR), Efficiency, Innovation and Lower Cost per Container Uniloy Milacron’s UR Series is an advanced reciprocating screw intermittent-extrusion blow molding technology. The Series is the preferred choice of molders globally for high volume production of lightweight monolayer and three layer containers, at the lowest possible cost per container. Ideal for HDPE and PP containers with capabilities of processing other materials. Foil seal or standard closures. Handle and non-handleware. Multi-layer and Clean-Blow™ systems are ideal for extended shelf life packaging of dairy and other food products.