Tension screens directly replace metallic meshes without having to modify or adapt the machine. They are built with metallic cable reinforcement to absorb the tension, increasing the polyurethane’s resistance to strain and load.
Flexible polyurethane:
Polyurethane with a formulation that adds flexibility, essential attribute when screening materials that build-up on screen surface, peg or wedge.
Standard monolayer polyurethane (single layer):
For all basic needs in screening we use our standard monolayer polyurethane, this is the same hardness through-out the PU panel.
Bishore polyurethane (double layered):
For special applications where soft PU is used on screening surface, to withstand the abrasion and hard PU to with stand impact and load.
Side tension meshes:
With metallic cable reinforcement to withstand the tension from the side tension hooks, perpendicular to the material flow.
End tension meshes:
With metallic cable reinforcement to withstand the tension from the end tension hooks, parallel to the material flow.
Properties
Due to its cable reinforcement in between almost every aperture it reduces the blind areas and increases its capacity to make it similar to metallic meshes, but with the wear resistance of PU.
Installation
Installing Poliuflex® screens requires no modification of the deck or tension system. It is installed just the same as a metallic screen, but while doing so bear in mind:
Each Poliuflex® screen must be tensioned by individual tension plates.
State the amount and distance of the deck’s support bars. Wherever there is a support bar a blind area should be placed to reinforce the screen.
As in metallic meshes, make sure that when tensioned the hooks of the screen don’t touch the inside of the screens walls.
If the Poliuflex® screen requires a centre hold-down bar, make sure not to cut any of the cables inside the screen.
Maintenance
Frequently check the tension of the Poliuflex®, screens and re-tension if required. In the event of material build-up, pegging or blinding, do not use sharp metallic objects to clear it, if necessary use declogging rods, or look at TN Flex® screens.
A positive result is obtained by keeping the screen working without any load when meshes are installed for the first time.
Polyurethane has great properties as a screening material. It is abrasion-resistant, works perfectly in dry or wet screening and has elastic properties to avoid material build-up, pegging and blinding. This is why there are many different screening systems made from PU.
All these systems have to consider wear resistance, screening precision, production out-put, and ease of installation.
Talleres Núñez’s technical department and R+D+I department, in its continuous search for new advanced screening systems, have designed, developed and tested the TN Flex® system, which has almost the same screening capacity as metallic mesh, it is manufactured in PU making it wear resistant, it has metallic cables inside to withstand loads and impacts and it has great self-cleaning properties thanks to its flexible and elastic characteristics.
What brings the main novelty to the TN Flex® system is its special aperture geometry, until now square aperture has always been considered to obtain the most precision in screening. TN Flex’s aperture has a square-like shape keeping its precision, but joining one side of this square to another making the hole perimeter a little more flexible to avoid even more the pegging and blinding that may occur.
The square-like shape in this product is ensured by the position of the tension cables which avoid any deformation in the aperture when tensioned.
This kind of screen combines the high abrasion resistance of TN’s polyurethane with the tension resistance of an additional material, creating a screen with high abrasion resistance, flexibility, avoiding pegging and blinding, and can be made with aperture sizes as small as 300 microns. It can be manufactured to any size, specification and to fit any machine.
The TN® modular system is completely interchangeable with other systems using the grooved metallic profile.
It works perfectly in screening and dewatering applications.
Panels can be replaced very fast without any specialized tools. The rubber wedge system fixes the panels tightly to the deck and the more load to be screened the tighter the wedge is fitted. To replace the panel just lift one side of the wedge and the rest comes out just as easy. No bashing or banging needed.
It has many different accessories to use in different situations like: a splitter module, which splits the screen deck in two, to screen two materials at the same time; deflectors, which can be added to any panel to redirect the material flow to the screening area of the deck; retainer bars, that retain material in order to distribute it evenly across the deck surface.
This modular system uses an additional connector piece called Indalo to fix the panels to the deck. These connectors fit in the grooved metallic profile by pressure. On the outside module it can either be incorporated (2), to avoid any gaps, or not (1).
To combine PU modules with metallic meshes or to screen with metallic meshes on decks ready set for PU modules, the metallic mesh panel is simply clamped down with the PU profiles.
This system uses a different connector profile that has three connection points; it also fits in the grooved metallic profile by pressure. The panels are fitted in and wedged down with a special PU Wedge.
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