Discussion
Screen blinding refers to
Answer: A
Correct answer: Apertures becoming plugged by particles
Blinding is the plugging of screen apertures by particles that lodge in them and neither pass through nor fall back. Near-size particles are the usual culprits, and damp or sticky material makes it far worse.
The effective open area falls, so both capacity and effectiveness deteriorate - and the deterioration is progressive, since each blocked aperture increases the load on the rest. The remedies are mechanical: ball or brush cleaners running beneath the deck, tapping devices, and screens tensioned so they flex as the deck oscillates.
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