Reactive extrusion of crosslinked polyethylene (PEX) pipe or cable coatings typically involves dripping silane and peroxide—two reactive liquids that are highly explosive—directly into an extruder.
Reactive extrusion of crosslinked polyethylene (PEX) pipe or cable coatings typically involves dripping silane and peroxide—two reactive liquids that are highly explosive—directly into an extruder. A safer alternative was introduced to the U.S. last year by Inoex LLC, Lancaster, Pa. Its gravimetric dosing system for PEX chemicals operates under an inert nitrogen blanket in all areas of feeding, including the gravimetric funnel. Silane and peroxide are individually temperature controlled. The system feeds 0.5 to 44 lb/hr of the liquid additives and reportedly enables cost savings by accurately dispensing lower amounts than are possible with dripping.