Woven Wire Screens

Information Needed For Ordering Screens With Edge Preparations

1. Specify number of pieces per opening size required.
2. Determine opening size and type.  If ordering slots, be sure to note direction of slot.
3. Determine wire size and type.
4. Measure the width outside of hooks or inside the hooks.
5. Measure the length of screen, noting any overlaps desired.
6. Determine the type of edge preparation required.
7. Specify any other special information required such as:  one hook up-one hook down, row of openings down center line (to aid in use of center tie downs,) braised center hold down holes (with or without washers,) welded edge wires, etc.

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Steps To Obtain Maximum Screen Performance

1. Loose screens break!  If screens are not securely tensioned and properly supported, they will break before wearing out.   

• After removing worn screen(s,) examine support deck and crown bars for excessive wear.   If any crown bars are worn so as to prevent providing proper support, either replace the bars or use J-bolts to pull down the screen to the crown bars.  On decks which use center angles to hold a hook that is down, make sure that the angles are not worn.  If the angle is worn, it will be impossible to properly tension the screens.
• Replace Crown Rubber (Channel Rubber or Bucker Rubber) every time screens are replaced to ensure a level cushioning surface.
• Replace all worn clamp rails, center tie downs, nuts and bolts.  A side clamp rail that is worn thin cannot provide sufficient tensioning.  Do not leave out any bolts in the rails or center tie downs.
• Make sure the screens fit securely on the deck.  Watch for loose spots, edges that are set on top of one another, clamp rails overlapping two screens, screens not centered with at least 1/2" (3/4" preferred) gap between the outside edge and the vibrator's side wall, and screen edges bottoming out on the shelf before achieving proper tensioning.  Also check for proper crown on the deck.  The screen should fit snugly against every crown bar.
• After running the vibrator for several hours, retighten the screen(s) which have been replaced to prevent breakage due to stretching.
• Routinely check for missing bolts, missing crown rubber, loose nuts, and loose clamp rails.

2. Problems with the vibrator can cause screens to break prematurely!

• Periodically check vibrator for balance and violent, uneven vibration.
• Inspect the areas around the machine watching for material leakage build-up which may interrupt the natural vibration of the screen.
• Correct improper conditions promptly.  Allowing bearing problems or other vibration problems to continue to increases the likelihood of causing damage to other parts, such as screens, crown bars, and deck supports.

3. Uneven material flow and worn spray bars can also cause excessive wear in spots, thereby reducing the screen's efficiency.

• Periodically wash out material which has built up in feed chutes, which may cause uneven material flow.
• Watch for direct concentrated water flow from spray bars.  Use spray bar deflectors to fan the water spray on the screening surface.  Quickly replace any worn deflectors.

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