New material for air flow systems
Muller Beltex of The Netherlands and UK have recently introduced a needle felt material called Polyveyor which is specially designed for use in air slides, fluidising discs and cones, and as aeration pads, particularly in the cement industry.
Traditional air flow belts are usually of a solid woven construction. This type of belt can have hot spots caused by uneven air flow through the weave, leading to lack of fluidity and reduced capacity. Polyveyor gives an even air distribution to ensure a good cushion for a consistent flow with virtually no abrasion wear.
Unlike solid woven belts, Polyveyor does not need to have the edges heat or silicone sealed to prevent air loss, and the needle felt material is easy to cut and drill for flange fitting.
Extensive testing by Spoornet Transwerk (South African Railways) for their cement applications has proved that Polyveyor not only gives consistently good flow rates, but has shown no particulate infiltration to retard the flow or shorten the belt life.
The standard Polyveyor material (type 1951) has a very small aperture opening of just 7 microns and is designed to operate at up to 150C, but a special high heat (250C) version is available to order, as are versions with different water permeabilities.
Muller Beltex will be featuring this new material at Hillhead, England in June, together with their highly successful Polysur Ferro steel cord elevator belts and synthetic buckets for heavy-duty cement applications.
