Bulk materia

This approach is usually not practical for drops less than 100 pm, since for most situations large cross-sectional areas are needed to reduce the bulk velocity below the terminal settling velocities of such drops. An air stream with a 10 ft/s vertical velocity will entrain water drops less than about 700 pm, while a bulk velocity of 1.0 ft/s will entrain drops of about 100 pm or less. Gravity techniques can be used to remove large quantities of die latger-size dispersed-phase materia prior to some other segregation technique. 

Figure 19.6 Variation of (a) modulus and (b) Izod impact strength with rabber content for three types of ABS materia (taken from ref. 32) (A) ABS 541 produced by bulk polymerization, has a broad particle size distribution over the range 0.5 -1.0 pm diameter, ( ) ABS 611 produced by emulsion polymerization, mainly comprises small particles in the range 0.1-0.3 pm diameter but also contains some larger particles ( 1 pm diameter) (o) ABS GRC produced by emulsion polymerization, comprises particles of 0.12 pm diameter ( ) unmodified SAN matrix material.

Raw Materia] and Product Storage are on-site storage facilities for raw materials and for product. Commonly, when on-site storage is required, storage capacity is provided for 30 days, or more, of raw materials or product. Typical storage investment costs are 90/t of material for bulk storage and 140/t for bagged material, If dehumidified starve is necessary, these costs are about 10% hicher. 

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