The frontal screw extruders use a flat screen, combined with two flat extrusion blades, to shape the granules. Two counter rotating screws feed the product to the extrusion die. The forces necessary to extrude the products are the highest, compared to other low pressure extruders. This results in hard and dense granules. Temperature raises up to 75 ›C, with hot spots up to 100›C are not uncommon for this machine type. The minimum screen opening is 2.0 mm.