Filter belt grooves are usually one of three basic shapes: V, Round or U. The V-shape is the most common. The purpose of the grooves is to transport the liquid being drained to the drainage holes of the belt. The area between the grooves, the ribs, supports the filter cloth and keeps it from filling the drainage holes. Grooves are either cut or ground into the top cover of the belt, leaving the carcass intact and protected.
Drainage Hole Patterns
Single Hole
Double Hole
Elongated Hole
A variety of drainage hole patterns are available for different filtering applications. The drainage holes usually straddle the ribs between two grooves, allowing one hole to drain both grooves. Hole patterns can be repeated across the width of the filtration belt if needed. The most common hole patterns are shown.
Fabric Free Zones
Fabric-Free Edge
Fabric-Free Drainage Hole
When the belt carcass must be protected from the liquid being filtered, NFM offers filter belts with fabric-free zones. These belts have the entire carcass removed from exposed areas, usually around the drainage holes and often the edges of the belt. The carcass of the belt is safely protected by a wall of solid rubber.
Bottom Guides
Many filtration belts have guides on the bottom of the belt to keep the drainage holes centered over the vacuum chambers or to aid in tracking. Several guides can be spread across the width of the belt, depending upon the number of vacuum chambers on the conveyor. Most often the drainage holes run through both the filter belt and the bottom guides.
Skirts
Cleat
Flange
Slope
Skirts increase the capacity of the filtration conveyor and help prevent spillage. Skirt styles and heights are determined for each specific application. The three most common styles are shown.
