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Polimak has successfully completed polyethylene handling projects for a global composite manufacturer. The client's demand was to achieve a seamless bulk material handling solution from raw material delivery to the feeding of the production line. The turnkey project includes an automatic sack discharging system, pneumatic conveying system, stainless steel storage silos, and extruder feeding system. All components of the system are controlled from a central PLC system for fully automated operation.

The core component of the project was an automatic bag discharge system that enables bulk materials coming from sacks to be unloaded in an efficient and safe way of saving manpower, time and operational costs. Bags with 15 to 50 kg on plastic or wooden pallets are placed on the belt conveyor of the system together with pallet by forklift. A conveyor moves the pallet to the bag lifting unit. The automatic gripping system grips the bags on the top with pneumatically driven claws. And moves them horizontally towards the rotating cutting disks. Bags are cut and contents are discharged downwards. A mechanical shaking unit shakes the bags to ensure that they are completely emptied. Empty bags on the left of the shaker bars are thrown into the waste bag cage by the sweep arms and compacted by bag compacting unit for simpler handling. Bulk material is then transferred to storage silos by the pneumatic conveying system.

Two stainless steel silos with 100 tons of capacity are used for temporary storage of PE pellets. Another pneumatic conveying system is used for transferring pellets to extruding line as long as needed. The system is designed to keep extruder hopper always full of an extensive range of safety functionality. All critical components are continuously monitored to provide uninterrupted service which is an important factor in extrusion lines.

Polimak is a solution provider in the bulk solids handling industry with 40 years of background. Experienced engineers can develop the right solution for a wide variety of industrial processes. The operational organization is flexible enough to supply problem free solutions for customers from a single equipment production to complete turnkey system installation in a short time. For more information, please visit