Bevel-helical speed reducers B3 ion of Article No and Article No supplement fo B3-SH-16B

Flender/Flender Gear Units/Bevel-helical speed reducers B3

obial deterioration. For produce that has low levels of respiratory activity, ushing with gas mixture composed of low 2and moderately high CO 2is often used to shorten the time needed to reach the desired in-pack gas composition. After closing the pack-age, the respiration of the product will result in continued decrease in the 2content and continued increase in the CO 2content. Altered gas concentrations, however, cause decrease in the respiration rate. Eventually an equilibrium concentration inside the pack- Postharvest Physiology of Fresh Produce 4 age will be reached, which is the result of balance between metabolic rates of the packed product and diffusion characteristics of the package materials. This explains the use ofthe term equilibrium-modied atmosphere (EMA) packaging. The package is often de- signed in such way that the equilibrium concentrations resemble the optimal gas concen-trations found in experiments where products are stored under range of stable gas condi- tions. For good application of MA packaging it is also essential to have insight into the respiratory characteristics of the product as they are affected by 2and CO 2concentra- tions. Often terms other than MA are used to refer to specic applications of packages. Active packaging is used for packages where specic compounds are added that absorb some of the gases in the package ( 2, 2, ethylene) or release specic compounds into the package atmosphere. Modied humidity packaging (MHP) is used for packages mainly designed to create an optimal humidity, instead of optimal 2or CO 2concentrations, thereby preventing dehydration and microbial spoilage of the packaged product. 2.4.3 Product CharacteristicsSome fruits and vegetables are well equipped to live detached from the plant, especially those designed for vegetative reproduction (carrot, potato, onion) and generative reproduc- tion (seeds and fruits). These products often contain large amounts of carbohydrates thatenable the mainten