![]() ![]() ![]() Kase Conveyors has a handy screw guide on its website that I have found useful. That is always an unknown and is based almost entirely on experience. But they do not provide for compaction of very low-bulk-density materials. To design the auger there are helpful tables of tubular screw-conveyor data on the internet that take into account similar material characteristics. With that data you can size the hopper for adequate capacity to service the extruder’s desired output and start to develop the crammer design. Bulk density can be measured by simply filling a calibrated container and weighing it. Bridging is related to both the angle of repose and the packing. Packing can be estimated by putting a cup-full into a plastic bag and squeezing it. The free-flowing characteristics can usually be estimated by the angle of repose and by passing the material through a large funnel. The goal of a properly designed crammer is to deliver material to the extruder screw uniformly without generating much temperature rise or excessive pressure. ![]()
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