DRY FLOW FUNNEL

Powder King® has implemented manufacturing of Dry Flow Funnels & Bulk Density Cup. Powder King® has purchased manufacturing rights from RotoSolutions of South Africa for the ARM/ARMO Standard Dry Flow Kit. Dry Flow Testing, which is the time taken for 100 grams of powder suitable for rotomolding to flow through a standard funnel and fill the measuring cup. Dry flow is the measure of how a powder will tumble and flow in the mold during the rotational molding process. Flowability affects the heat transfer in the powder pool and how the powder distributes itself within the mold. Flowability depends mostly on the particle shape and to a lesser extent on particle size. Particles that have been ground poorly will have “tails” which will cause powder to have poor flow properties, possibly leading to pinholes on the surface, bridging across narrow recesses, a rough internal surface, a high void content within sharp corners and threads in the molded part. Test results can be also affected by the funnel’s shape and dimensions, surface roughness of the inside of the funnel and powder temperature, hence look after your funnel and do all tests at room temperature, 72F.