Packaging materials for dry products, powder products, electronic products and other products sensitive to water vapor should have good moisture barrier performance, which is generally characterized by testing the water vapor transmission rate of packaging materials; packaging materials with high water vapor transmission rate have poor moisture barrier performance. Water vapor permeability refers to the mass of water vapor that permeates a unit area of a material in a specified time period. According to the [...]

Blister packaging is a form of packaging which is made of transparent plastic sheet or aluminum plastic composite sheet with blisters and covered with aluminum foil. Because each blister is independent from others, one damaged blister will not affect the sealing of other blisters. Therefore, taking out the product in one blister will not affect the protective effect of blister packaging on other products. The advantages of blister packaging and the popularization of blister packaging [...]

Water vapor permeability is an important performance index of the moisture barrier properties of materials. The measurement and research of water vapor permeability is an important link in the application of materials. The principle of cup method is one of the important principles for measuring the water vapor permeability of materials. It is also called the principle of gravimetric method. It calculates the water vapor permeability of materials according to the change of the weight [...]

Good waterproof is a basic property of exterior wall coatings for buildings. When there is a humidity difference between the two sides of the wall, water vapor will permeate through the wall from high humidity side to low humidity side, resulting in the moisture transfer in the wall. In addition, if the permeability of building materials is poor, the rain or snow water leak into the interior of the wall through the cracks, while the [...]

1. Significance Comfort and gas permeability of sanitary towel are two of the key research subjects for manufacturers, also selling points that may attract consumers. The main indicators of the sanitary towel’s comfort include the ability to absorb and block the liquid, quick-drying and breathability. Those properties vary by different materials of sanitary towels. Generally speaking, the structure of the sanitary towels has mainly three layers: the surface layer, the absorbent layer, and the bottom [...]

According to different uses, materials barrier properties of oxygen, water vapor, nitrogen, carbon dioxide, air and other gases are tested and expressed by the transmittance of the corresponding gas. Temperature and humidity are two important test parameters in the test of barrier performance. The change of temperature and humidity will affect the internal structure of materials and the movement ability of gas molecules, especially for water vapor permeability test, humidity is the drive for water [...]

Comfort and gas permeability of sanitary towel are two of the key research subjects for manufacturers, also selling points that may attract consumers. The main indicators of the sanitary towel’s comfort include the ability to absorb and block the liquid, quick-drying and breathability. Those properties vary by different materials of sanitary towels. Generally speaking, the structure of the sanitary towels has mainly three layers: the surface layer, the absorbent layer, and the bottom layer. The [...]

UV curing adhesive is one kind of adhesive, where the ultraviolet light and visible light is used to initiate a photochemical reaction that promotes the curing of adhesive. UV curing adhesive is featured with fast and simplified curing process, energy-saving and easy-to-use and many other advantages, which is suitable for production of crafts, glass wares, PCB, optic fiber and medical devices parts, etc. Moisture barrier property is quite important for UV curing adhesive. For example, [...]

Rice cereal is usually used as a supplementary food of breast milk or other infant formula food, which provides necessary nutrition to the babies. Rice cereal is mainly made of millet or rice, formulated with sugar, vegetables, fruit, egg and meat, etc. which contain rich amount of minerals including calcium, phosphorus, iron, zinc and vitamin. The most commonly used package for rice cereal is paper-aluminum-plastic cans. Once the water vapor in external environment enter inside [...]

The aluminized paper is mainly composed of paper and aluminum coating, which is widely used in package for cigarettes, alcoholic drinks, labels of bottles, tea, food, cosmetics, daily chemicals, gifts and handicrafts, etc. for its smooth and glossy surface, good flexibility and proper barrier properties. Besides, the aluminum coatings of aluminized paper have good abrasion resistance, which is suitable for printing and mechanical processing. Sometimes, the aluminized paper is also used in construction materials. When [...]