Capital Equipment News October 2021

SCREEN MEDIA

then it may be time to look into a new screen media configuration. Ideally, the screen media should complement the three main phases of screening: the feed end, the middle of the deck, and the discharge end. Many operations use mixed screen media for optimal results. Material of all sizes hits the deck at the first phase on the feed end. For that reason, this section should be able to handle large material impacting the deck, as well as fine particles. If the screen media in this area is wearing down or breaking too often, then consider something more durable. Depending on the application, this could mean thicker wires, steel plate, rubber or polyurethane, or polyurethane strips reinforcing key parts of the screen deck. The middle of the deck should still be durable, but may feature more open area to increase screening action. The discharge end generally features the most open area, because by this point any remaining material should be near or oversize. Near-sized particles, for example, need the most tries to screen out successfully. Some operations feature a reinforced media on the feed end and high-vibration wire screens – or self- cleaning screen media – on the rest of the deck. As mentioned above, the high-vibration media reduces common screening problems while maintaining an increased level of durability. Another thing to consider is whether the problems may be caused by damaged equipment or improper installation. Proper tension is key for both the performance and the longevity of the screen media. Check tensioning weekly to ensure it is proper. Improper tensioning leads to early breakage. Replace clamp bars that are getting thin or caving in order to prolong screen media life. Rubber or polyurethane-reinforced clamp bars are another option to improve longevity. Also, confirm there is a bolt in every hole to maximise durability. Make sure to purchase any replacement components such as tension rails from the OEM. Even the smallest deviation from the original design can lead to early screen media failure. The counterpart of the clamp rails that contributes to proper tension is the crown curve of the deck. Tension can’t be achieved on a flat deck and on a curved deck any deviation will leave the screen hanging in the air, leading to improper tension and, ultimately, breakage. Additionally, check that all the support bars and rubbers are in good condition and that the panels are laying firmly on the supports. Work with an expert Consider scheduling a screen media maintenance and installation training either with the manufacturer or a local dealer. The benefit of a trained team is knowing media is installed correctly and will have the longest wear life possible. Work with an expert to conduct a thorough evaluation of the screening process to identify problems and the best solutions. Make sure to choose media that fits the application and the different phases of screening. Careful thought and selection can improve the bottom line and reduce headaches associated with downtime and lost profit. b

Persistent problems with uptime and production quality can be frustrating. Knowing how to diagnose common problems can expedite the process and keep the machine up and running.

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