Blinding issue troubles plenty of mineral processing sites. When polyurethane screen mesh gets blocked, actual throughput drops sharply and product grading result fails to meet expected standard. Many site operators only replace screen panels without digging out real triggers. Clear understanding of relevant influencing factors helps cut unnecessary spare‑part cost and stabilize continuous production output.

Material moisture and near‑size particle proportion rank as primary influencing elements. High moisture content makes fine mineral particles stick together and attach onto screen hole surface. Particles with dimension close to aperture size easily wedge inside openings and generate pegging effect. Even high‑quality polyurethane screen mesh will face frequent blinding risk if feed material carries excessive mud and sticky components. Adjusting pre‑processing procedures to lower material stickiness can greatly ease such negative influence.

Improper hardware configuration also brings frequent clogging troubles. Hardness grade of screen panel, aperture shape and vibration amplitude will change anti‑blinding performance. Over‑hard polyurethane panels lose flexible self‑cleaning capacity during vibration. Round apertures hold higher pegging risk compared with slotted openings. Insufficient vibration amplitude cannot generate enough deformation to shake off stuck particles. Matching panel hardness and aperture structure for actual mineral condition creates better screening performance.

Overfeeding and uneven material distribution accelerate blinding progress. Excessive material accumulates on partial screen deck and covers large quantity of screen holes. Heavy material layer restricts panel elastic deformation and weakens self‑cleaning function. Some production sites pursue maximum throughput blindly and ignore load limit of screen media. Even premium mining screen cannot maintain stable performance under long‑term overload feeding. Controlling uniform feeding speed avoids partial material stacking.

Irregular inspection and maintenance speed up blinding occurrence. Tiny mineral residues gradually accumulate inside apertures after long‑time running. Without regular offline or online cleaning, residues will solidify and become hard‑to‑remove blockages. Operators should establish fixed inspection cycles to check screen hole condition. Timely partial cleaning prevents small residue accumulation evolving into full‑surface blinding fault.