WSM’s two-pass grinding systems are saving customers money. By employing this two-step system, larger size material can be converted with lower horsepower requirements and less energy usage. 

The two-pass system combines a slow-speed high torque shredder and a high-speed vertical feed grinder. The high torque shredder is the primary grinder used for the initial reduction of coarse material down to a 20-24” minus. The vertical feed grinder, or secondary grinder, then produces the finished product. 

Pre-screening technology is another money saving option WSM offers. Adding pre-screening machinery after the primary shredder and before the secondary grinder will remove acceptably sized material and metal contamination before entering the secondary grinder, saving even more on energy and maintenance costs.

This is an efficient system for many types of materials including, green waste, food waste, C&D waste and urban wood waste.