Particle Size Enlargement

  1. The chief methods are: compression into a mold, and extrusion through a die, followed by cutting or breaking to size; globulation of molten material, followed by solidification; agglomeration under tumbling or otherwise agitated condtions with or without binding agents.

  2. Tablets are made in rotary compression machines that convert powders and granules into uniform size pieces. Ususally maximum diameter is about 1.5 in., but special sizes up to 4 in. are possible. Machines operate at 100 rpm or so and make up to 10,000 tablets/min.

  3. Extruders make pellets by forcing powders, pastes and melts through a die, followed by cutting. An 8 in. screw with a capacity of 2,000 lb/h of molten plastic is able to extrude tubing at 150-300 ft/h and cut it into sizes as small as washers, at 8,000 pieces/min. Ring pellet extrusion mills have hole diameters of 1.6 to 32mm. Production rates are 30-200 lb/(h)(hp).

Drying and SolidsConveyors for Particular SolidsCooling TowersCompressors and Vacuum PumpsCrushing and Grinding
Extraction, Liquid-LiquidCrystallatisation from SolutionFiltrationHeat ExchangersMixing and Agitation
Particle Size EnlargementpipingPumpsReactorsRefrigeration
Size Seperation of ParticlesUtilities, Common SpecificationsVessels (Storage Tanks)

The information is arranged by commonly recognised categories. In some instances, definitions and general statements have been included for clarity.