Fresh fruits and vegetables maintain a certain metabolism such as respiration after picking. Respiration is the process of decomposing the substrate of fruits and vegetables to produce small molecular substances. When aerobic respiration occurs, carbon dioxide, water and heat are produced. When anaerobic respiration occurs, alcohol, carbon dioxide and heat are produced. Alcohol accumulating in [...]

The barrier performance of packaging materials is affected by many factors, such as material properties and external environment. The performance factors of the material itself include material structure, crystallinity, defect, free volume, interaction between material molecules and gas molecules, etc. the external environmental mainly refer to the temperature and humidity of the environment in which [...]

Nutrient fluid is one common health care product. If the barrier property or seal integrity of the packaging is insufficient, the nutrient fluid may change in color due to the oxidization of some ingredients contained in nutrient fluid. There are usually a large amount of protein, vitamin and other ingredients that are liable to react [...]

Plastic wrap, is a thin plastic film typically used for sealing food items in containers to keep them fresh over a longer period of time. The plastic wrap can be classified into different types by the materials used and plasticizer added. Different types of plastic wrap can be used for applications. No. 1, PE film, [...]

Protein-based edible films have received consideration attention in recent years because of their advantages, including their use as edible packaging materials, over the synthetic films. In addition, protein-based edible films can also be used for the individual packaging of small portions of food, particularly products that are not currently individually packaged for practical reasons, such [...]

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. [...]

A contact lens, or simply contact, is a thin lens placed directly on the surface of the eye. Contact lenses are considered medical devices and can be worn to correct vision, or for cosmetic or therapeutic reasons. Contact lenses can be classified into three types by their materials, soft lenses, rigid lenses and hybrid type [...]

With the fast development of transport service and improvement of storing technique, the commercial products such as food, medicines, and healthy products etc. can be sold very far away from their places of origin. For example, in China, from north to east and from west to east, the environments of different regions are remarkably various [...]

Infusion bags are widely used in clinical treatment with which the medicine can be directly applied to the venous blood increasing therapeutic effect. There are two main categories of infusion bags: PVC and Non-PVC. Today most of the non-PVC infusion bags are made of multi-layer copolymerized compound membrane, which contains PP, PE, PA and SEBS, [...]

Sulfur hexafluoride (SF6) is an inorganic, colorless, odorless, non-flammable, extremely potent greenhouse gas, which is an excellent electrical insulator. The greenhouse effect of SF6 could be 25, 000 times of that of carbon dioxide. And even worse, SF6 can stay active in gas for more than 3400 years. Today over half of SF6 produced in [...]