提供包装中使用干燥剂以降低包装内部湿度的指南。附录中给出了所需干燥剂数量的计算示例，以及渗透性和水蒸气透过率的注释。

Provides guidance on the use of desiccants in packaging to reduce humidity inside packages. Examples of calculation of quantity of desiccant required as well as notes on permeability and water-vapour transmission rate are given in appendices.