A fertilizer bagging machine, such as the Gravity Flow Open Mouth Bagger (GWB), fills open mouth bags with dry, free-flowing and minimally dusty fertilizer granules at a rate up to 5-8 bags per minute (300-480 bags per hour). The bags most commonly used with this machine are an open top poly bag or a poly-lined paper bag. The bags are filled to a 50-pound target weight.
Fertilizer can also be packaged in valve bags using a Model 730 Air Pressure Packer. This machine can fill bags at a rate of 5-6 bags per minute to a set target weight of 50 pounds. It is common for fertilizer bagging machines to be made of 304 stainless steel or at least have 304 stainless steel contact surfaces.
Fertilizer is emptied from bulk bags into a hopper and then discharged using an incline screw conveyor. The fertilizer is then conveyed into the Model GWB open mouth bag filler (or the Model 730 Air Pressure valve bag filler). Each filling sequence starts automatically when the operator places the bag onto the bagging machine. Filling stops when the bag reaches set target weight. Then it drops to a conveyor below where it is run through a bag sealing device. The sealed bag moves to a bag transfer conveyor and through a bag flattener.
It is conveyed to a palletizing station where it can be stacked onto a shipping pallet manually by at least 2 people using an inclined conveyor and an EZ pallet loading station. Palletizing can also be fully automated using a bag palletizing robot.