How to use desiccant to protect products?

In product packaging or in the process of storage and transportation, water vapor will invisibly invade the inside of the product and bring a lot of harm. The stability and integrity of many pharmaceuticals and biochemical reagents need to be ensured by strict control of moisture in the packaging environment. Many semiconductor materials require under RH5% control humidity, moisture can make the product easy to mildew, rust, caused by internal fiber in the chain of intermolecular forces, on certain occasions, the water vapor will be certain products by forming hydrate internal part of the crystal structure and transform the physical and chemical properties of the product.

By choosing the right desiccant can use little cost, good protection of the product, so that the quality of the product can be greatly improved, from reducing or avoiding customer complaints.

When solving the problem of moisture in packaging, there are often many doubts or difficult problems to solve, but all kinds of problems can be divided into two categories:

(I) just about the product, its packaging and its environment.

(2) chemical and physical properties of different desiccant.

Environment: All aspects of product packaging, storage and transportation must be taken into account when controlling humidity. Temperature and relative humidity are the two main factors affecting the environment. Product moisture sources can be divided into four aspects:

(1) When the product is packaged, the water vapor in the air means the water vapor in the air in the package. The first source of moisture in the product is moisture in the air during the sealed packaging process in the packaging shop. The first factor to consider is when calculating the amount of desiccant.

(2) the moisture absorbed by the product itself. Furniture products, textile products, paper products, etc., will absorb moisture in the process of production and storage. It is necessary to calculate the corresponding amount of desiccant to absorb this part of moisture.

(3) Moisture adsorbed by packaging materials. Wood, fur, foam, paper and other commonly used product packaging materials can adsorb moisture. After the ambient temperature rises, the adsorbed moisture will evaporate into the closed packaging space of the product, increasing the risk of moisture damage to the product.

(4) Water vapor permeated through packaging materials. During the transportation and storage of the products after sealed packaging, the moisture from the external environment will constantly penetrate into the packaging environment. This part of the water vapor varies with the storage time and the water vapor transmittance of the packaging material, and is sometimes the largest water vapor source to be removed by the desiccant.