Why Inflow Pressure Screens Experience Pulp Buildup and Clogging
The inflow pressure screen is a key machine in the paper making line. Pulp enters from the outside, good fibers pass to the inside, and impurities stay outside. However, this inflow pressure screen often faces a major problem: screen basket clogging and hanging pulp. If long fibers are longer than the screen slots, they form bridges and trap more fibers. Also, hard things like broken refiner teeth can hit the bars and bend them, creating new bridges. When the rotor blades wear out, the backwash water gets weaker, and this inflow pressure screen cannot push the pulp through. High temperature and high reject consistency also make the inflow pressure screen clog easier. If the hanging pulp falls into the clean side, it causes paper breaks and unplanned downtime.
To fix these problems with your inflow pressure screen, you need smart actions. First, choose the right screen basket. Make sure the slot width of the inflow pressure screen is wider than the longest fibers in your raw material. Second, check the gap between the rotor and the basket often. Keep this gap right so the inflow pressure screen has strong backwash power. Third, stop impurities before they arrive. Check your refiner teeth often and clean all welding slag in the pipes. Finally, use a DCS system. Modern control can detect clogging early and fix it automatically. The table below shows a simple guide to these solutions for the inflow pressure screen:
| Problem Type | Main Cause | Solution |
|---|---|---|
| Fiber Bridging | Long fibers wider than screen slots | Choose a wider screen slot |
| Bar Deformation | Hard impurities hitting the bars | Check upstream refiner and clean pipes |
| Weak Backwash | Rotor blade wear | Check and adjust the rotor gap |
| Frequent Clogging | Poor control | Use DCS for pre-treatment |
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