The tighter the substrate is packed, the more the bag is pushed outward. A loose fill does not push the bag outward.
Core principle
The bagging machine pushes the substrate into the mushroom bag through a screw conveyor. As the material is compressed, a reaction force moves the bag and sleeve backward. The tighter the fill, the higher the material density, the greater the resistance to screw feeding, and the stronger the reverse thrust. The sleeve and bag are then pushed out. With a loose fill, resistance is low, reverse thrust is insufficient, and outward pushing does not occur.
Key factors
Fill tightness: higher tightness increases friction between particles and internal pressure, which strengthens the reverse pushing force.
Material moisture: substrate that is too wet has poor flowability and can block inside the screw. A sudden pressure rise can push the bag out violently.
Equipment feed speed: when the feed speed does not match the screw speed, such as when the screw turns too fast, material compression increases and the risk of outward pushing rises.
Mechanical resistance: friction between the sleeve and bag, assembly accuracy, and other factors also affect the pushing force.
Solutions and adjustments
Operators should set fill tightness to a suitable range. The bag should feel slightly elastic when lifted, and the substrate should show a slight dent when pressed with a finger.
Check and adjust material moisture, usually kept at 60% to 65%. A handful should form a ball and break apart when touched.
Adjust the match between screw speed and feed speed to avoid pressure buildup from overly fast operation.
Maintain the equipment regularly. Keep the sleeve smooth and free of burrs to reduce unnecessary mechanical resistance. If the sleeve or screw conveyor is worn and needs replacement to match the site, we can custom machine it according to customer drawings. Hansheng Automation supports single-piece and small-batch delivery.
Operation safety
While the bagging machine is running, operators must not put their hands near the sleeve outlet. This prevents mechanical impact or pinching when the bag is pushed out.
Beyond sleeves, screw conveyors, and related parts for mushroom bagging machines, our custom precision parts machining capability also covers food machinery parts, packaging machinery parts, tobacco packaging machinery parts, and filling machinery parts. Hansheng Automation can also machine yacht precision parts, RC car precision parts, and non-standard parts for printing machinery and medical devices according to drawings, supporting drawing-based customization and small-batch delivery.
