home WHAT IS A WEDGE WIRE SCREEN ?
It is a sieve made from looped wires formed into a deep wedge-shaped section.
Individual wedge wires are built into "Panels" by threading cross rods of suitable diameter through the loops. The whole is then clamped and made secure usually by riveting or putting ring nuts over the cross rod ends or by welding.
The Wedge Wire Screens can be supplied in various shapes and forms as per the requirements such as FLAT PANELS, CURVED SIEVE BENDS, CONICAL BASKETS, CYLINDERS, TROUGHS DISCS either in one piece or in segments. For curved, cylindrical and conical screens in most cases the cross rods lie along the circumfrance and profile wires run parallel to the axis.
Ocassionally this arrangement is reversed.
Wedge Wire Screens provide a unique combination of the most important features required for maximum screening efficiency.
The wedge-shaped sections of the wire form aperatures that become progressively wider in a downward direction, thus ensuring rapid flow of material through them. Clogged and blinded aperatures are reduced to an absolute minimum.
In our opinion no form of screening surface with apertures as fine as those of wedge wire screens, can compare with the mechanical strength and working efficiency of wedge wire.
For a given aperature size, wedge wire screens have a much larger percentage of open area than conventinal sieves.
Owing to a greater wearing area being provided by flat top surfaces, wedge wire screens retain their aperature for a longer duration than round wire screens.
* Some other advantages of Looped type of wedge wire screens over other type of screens and also other type of wedge wires are -
Looped Wedge Wire Screen construction is particularly recommended when high Vibration resistance and fine accurate aperture are needed.
Wedge wire easily lends itself to a variety of Screen Panel Constructions. Many different side finishes are available, some of which are given below :
The screens are reinforced with single reinforcing flat, double reinforcing flat and combination of single and double reinforcing flats welded to end flats. However framings should be as per fitment design in the deck. Customers are required to specify framing pattern h the order.
Special screens can be developed for customised applications not covered by metheods mentioned above.
A further method of strengthening a wedge wire screen panels, in addition to framing and reinforcements, against transverse bending is to put a run of weld along the bottom side of the loops. The weld run may be continuous along the whole length of the cross rod or skip or staggared welding may be employed.
In special cases involving side loading (Cross feed) on fine aperture wedge wire, specing lugs are introduced to give lateral support at points between the loops and shorten the unsupported span to maintain accuracy of the aperture.
While mounting of Wedge Wire Screen Panels, utmost care should be taken that all screen panels are rigidly fixed on the deck frame. The cover rail of Flats used for bolting the panels on the deck frame must not be put directly on the panel surface. Rubber packing in between must be provided.
Sufficiant rigid fixing is necessary so as not to develop any secondary vibration (flexing) under operation as this will result in premature failure of screen panels. To ensure the rigid fixing during opeartion periodical check of tightining bolts is recommended.
|APERTURE||SECTION NUMBER||APPROX. OPEN AREA %|
|1.75 mm||28||37.0 i|
|Over 4.0 mm||Details on request|
* Any aperture can be obtained on most of the profiles.
|SECTION NUMBER||PROFILE WIDTH mm||PROFILE DEPTH mm|
|49||4.08||- j JS. 6.63|
N.B.: Special profiles of wedge wire with slight variations in the profile depth and width can also be made.
Mini Wedge Wire is a development of standard Wedge Wire, complementing the micro fine range of apetrure. It is virtually the same in constructional details, each individual panel is built from looped and pressed wires assembled on threaded rods.
Mini Wedge Wire can be supplied with the following combination of aperture and cross rod.
|APERTURE||CROSS ROD DIA||PITCH||NO. OF LUGS WITHIN ONE PITCH|
|0.05mm (50 Micron)||5 dia||70/66mm||2|
|0.075 mm (75 Micron)||5 dia||70/66mm||2|
|0.10 mm (100 Micron)||5 dia||70/66mm||2|
|APERTURE||CROSS ROD DIA||PITCH|
|0.05mm (50 Micron)||3.2 dia||25.4mm|
|0.075 mm (75 Micron)||3.2 dia||25.4mm|
|0.10 mm (100 Micron)||3.2 dia||25.4mm|
|APERTURE||CROSS ROD DIA||PITCH|
|0.05mm (50 Micron)||4.80 dia||38.1mm|
|0.075 mm (75 Micron)||4.80 dia||38.1mm|
|0.10 mm (100 Micron)||4.80 dia||38.1mm|
While sending your enquiry or order for wedge wire screens, it is most important to give information in full detail.
Not only does this ensure that the screens exactly correspond to the specifications laid down, but should there be an alternative make-up using perhaps a different profile, section size or method reinforcement, it can be put forward for consideration. The following information is essential :
Overall length - parallel to wedge wires
Overall width - parallel to cross rods
Are cross rods to be secured by riveting, screwing or clamping?
Is there any reason for wedge wires to extend more than half a pitch beyond the end cross rods?
Sketches - Show details of the frame and relative position of wedge wires.
Sketches - Show location and size of bolt holes in wedge wires, bolt holes in notches side or rubber frame.Make Enquiry