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  • Fine Powder Design - Flow Rate Control (.pdf)
    conditions. Flow rate limitations are often severe and it is difficult to tell the difference between a slow flow rate limited condition and a cohesive hang-up. Fine powders have two flow modes under gravity feed conditions. If there is enough gas entrained in the material, then the bulk solid becomes
  • Electromechanical Feeder for Conveying Sticky Powders
    PROBLEM: An operator at Metal Coatings International was hand feeding aluminum and zinc powder into a feeder. This resulted in lumps of material falling onto the mixing blade, causing the blade to bend, resulting in a loss of material. SOLUTION: Cleveland Vibrator fabricated a feeder to convey
  • Can You Measure Powder Flowability? (.pdf)
    friction, which allows them to form piles with angles relative to the surface on which they are placed. At ambient conditions, powders do not change flow behavior when subjected to variable shear rates, whereas most liquids do. When loaded into a hopper, pressure can increase the strength (i.e.
  • Dosing For Effect - Getting It right The First Time
    with a cone/plate rheometer (See Figure 2) at variable rates to determine the viscosity profile. (See Figure 3) This technique produces viscosity data that can be correlated with the size opening in the nozzle required to produce a desired volume flow rate. Since this is an analytical approach, it may
  • Improving Control of the Extrusion Spheronization Process
    , by reducing variations in gastric emptying rates and overall transit times. Pharmaceutical pellets are typically manufactured via extrusion spheronization, a three-step process introduced in the late 1960s, that results in spherical granulates roughly 1 mm in diameter. In this process, the powder is formed
  • Tumbling to the Finish
    Plastonicsâ unique powder coating process keeps costs down The Flow-Clad system of coating smaller parts at higher production rates uses a tumbling method not usually found in many custom coaters. â I just donâ t think too many people even know that this process exists,â says president Bob Zimmerli
  • A Guide to Measuring Paint Viscosity vs Temperature
    and high shear rates? It is needed to determine behavioral characteristics such as how the paint will perform under the heat of summer outdoors in Arizona as compared to a cool spring in New England? What are its shear-rate dependent characteristics at these temperatures? A profile needs to be done
  • Porous-Metal Bearings
    as particle size of tin or copper powder in the mix decreases. Graphite additions result in growth but always lower the strength of the bearings. Lubricants used in the mix have only a slight influence on dimensional change, but a more pronounced effect on the apparent density and flow rate. After

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