5 Common Causes of Screen Blinding & How to Fix Each

Blinding — apertures plugged, flow decaying — is the number-one support call we receive. The good news: each root cause leaves a fingerprint, and each fingerprint has a standard fix. Diagnose before you spend.

1. Moisture in hygroscopic powders

Fingerprint: hard crust on the mesh, worse on humid days / after weekend shutdowns. Fix: dry or condition feed; heated frame option for chronic cases; never let a humid silo feed a fine mesh directly. A 1% moisture swing can halve throughput on icing sugar.

2. Electrostatic cling

Fingerprint: powder coats the entire mesh cloth evenly, undersize looks clean (particles sit ON the mesh, not IN it). Fix: ground the frame, anti-static mesh kit, humidity control in the room — and ultrasonic if the powder insists (polymer powders usually do).

3. Near-size particle build-up

Fingerprint: particles exactly 1.0–1.2× aperture wedge and stay; the mesh blinds progressively from the feed point outward. Fix: raise amplitude (adjust eccentric weights), add bouncing-ball or ultrasonic cleaning, or re-examine the cut — sometimes the honest answer is that a guard cut at 1.05× your top spec is asking mesh for tolerance it does not have.

4. Worn or damaged mesh

Fingerprint: throughput fine for weeks, then a sudden rip/wire-break releases oversize downstream. Fix: inspection schedule (a 2-minute torch check per shift), spare meshes on the shelf sized to the machine, and correct tension at every change. A mesh that tears repeatedly usually means the tension ring or the feed pattern is wrong, not the mesh brand.

5. Wrong amplitude or feed rate

Fingerprint: dead-bed in the centre, clean annulus at the edge (under-vibrated); or material ejected over the side before stratifying (over-vibrated / over-fed). Fix: eccentric weight adjustment in 10-minute increments while watching the discharge; feed spreader to break the centre column; check that nameplate capacity has not been “optimistically” exceeded.

The diagnostic shortcut

Photograph the mesh at failure and compare it to the five fingerprints above — 80% of blinded-mesh photos diagnose themselves in ten seconds. If yours does not, send us the photo and the material name; our lab has seen most of them.