176 Novel food packaging techniques sture adsorption of montmorillonite clay at low humidity 432 Adsorption time(hr) at 25C L-Oklahoma-1-20%RH +-Oklahoma-1-40% RH Fig 9.3 Adsorption vs time released MIL-D-3464C, covering the use of bagged desiccants for packaging and static dehumidification. Three years later, MIL-D-3464D served to update the original specification, creating a uniform standard of comparison in a wide variety of areas: adsorption capacity and rate, dusting characteristics of the package, strength and corrosiveness of the package and particle size of the desiccant In 1973, the dod followed with specifications for cleaning, drying, preserving, and packaging of items, equipment and materials for protection against corrosion, mechanical and physical damage and other forms of deterioration. MIL-D-3464 and MIL-P-116 have long been the only objective ource for packaging engineers. The strength of these specifications lies in their determination of a uniform unit of drying capacity, enabling one to compare desiccant effectiveness on a common scale 9.4 Molecular sieve 9.4.1 Composition and purity The composition of molecular sieves are sodium- um-- and magnesium-aluminum silicates. These form orderly pores of a consistent size 9.4.2 Common types and nomenclature Molecular sieves are usually designated by their pore size expressed Angstrom units(10m). The most frequently encountered is type 4A with areleased MIL-D-3464C, covering the use of bagged desiccants for packaging and static dehumidification. Three years later, MIL-D-3464D served to update the original specification, creating a uniform standard of comparison in a wide variety of areas: adsorption capacity and rate, dusting characteristics of the package, strength and corrosiveness of the package and particle size of the desiccant. In 1973, the DOD followed with specifications for cleaning, drying, preserving, and packaging of items, equipment and materials for protection against corrosion, mechanical and physical damage and other forms of deterioration. MIL-D-3464 and MIL-P-116 have long been the only objective source for packaging engineers. The strength of these specifications lies in their determination of a uniform unit of drying capacity, enabling one to compare desiccant effectiveness on a common scale. 9.4 Molecular sieve 9.4.1 Composition and purity The composition of molecular sieves are sodium-, potassium-, calcium-, and magnesium-, aluminum silicates. These form orderly macrostructures with rigid pores of a consistent size. 9.4.2 Common types and nomenclature Molecular sieves are usually designated by their pore size expressed in Angstrom units (10ÿ10m). The most frequently encountered is type 4A with a Fig. 9.3 Adsorption vs. time. 176 Novel food packaging techniques