Dear Shri Sudhakar,

I suggest you to put following information, which will help the respondents to give some suggestions :

1) Size of feed material with size distribution percentage.

2) Moisture content in material.

3) Whether blinding all the time in a year or only during rainy season.

4) Passing size for upper deck

5) Screen vibration amplitude and frequency (this you may get from supplier’s specification).

6) Capacity (feeding rate) to the upper deck, mtph.

Regards,

Ishwar G Mulani.

Author of Book : Engineering Science and Application Design for Belt Conveyors.

Advisor / Consultant for Bulk Material Handling System & Issues.

Email : parimul@pn2.vsnl.net.in

Tel.: 0091 (0)20 25882916 ■

There are several anti-blinding devices available on the market for deck screeners. Look for ultrasonic devices as well as traditional ball decks on the problem deck. ■

Dear Sir,

you can easily to solve the blinding problem with "elastic" polyurethane screen mesh with rectangular holes.

Moreover you must to adapte the vibrating amplitude and frequency.

With this vibration modification and with the use of special "elastic" screen mesh you can to screen material with mistake until the 7 %

If you need additional information not hesitate to contact me.

A. MARIO

Eurogomma

a.mario@eurogomma.com ■

I agree with the flexmat answer.......if the product is crushed product.

Basically, many many users with this problem in CANADA have completely solved their blinding problem with the FLEXMAT self cleaning woven wire cloth. THEY WILL PROVE IT, no prob.

Here, you must try and then confirm success or fail.

What type or make of screener, what speed or rpm running, what stroke or amplitude of eccentricity are you actually operating at, and most importantly, what degree or angle of installation.

How many TPH, metric or imperial are you trying to process.

Is bed depth too deep? I suspect...YES

What is sieve analysis of feed to top deck

I await you reply..............Hoping to help as usual.

George Baker,,,,,,MODERATOR ■

Hello George,

For my experience the here the screening data you request:

apertures: 2,4x6 mm

RPM: 1200

amplit.: 3,5/6 mm.

TPH: 8 ton/mq./h 8 (dry process); 27 ton/mq/h (wet process)

inclination: 10-13°

The grain distribution (crushed) is:

0 to 5,5 mm.

0-1,5 mm. 25%

1,5-2,5 mm. 40%

2,5-5,5 mm. 35%

Please note that I am referring to the special "superelastic" polyurethane (Eurogomma formula) screen mesh water jet holed.

Moreover the p.u mesh duration is 7-12 times more than the wire self cleaning mesh.

Regards

A. MARIO ■

Hello A. Mario: Thanks for the info....appreciated.

At first glance........the thing that JUMPS OUT TO ME ....is the low angle on incline (too low) I would think this would make the bed depth too deep and cause fines carried over into the OVERS.

TYPICALLY, finer screening requires two things.....steeper angle and faster RPM.

FOR BLINDING: more aggressive action if possible would benefit clearing the apertures....if more RPM is allowable by the manufacturer.

1200 RPM is not overly fast for this separation.

THE POLY media is quite interesting. A digital pic on this and a side angle of the machine would be very helpful. I can do it all by words or math but, a digital pic would really help clear up faster.

Are the poly panels......sold poly segments say 2'x2' or 2'x4' or some other dimensional configuration?

I would say you are blinding more when attempting to screen wet crushed and somewhat better screening on dry crushed screening.

FOR NOW, could you EMAIL me at bael@golden.net some digital pics of this screener and I will answer back here in the FORUM.

APPRECIATED.

GEORGE..........ciao ■

I appreciate your knowledgeable imput. George..... ■