B2DH-6-C iew Article No th to th position Article No Bevel-helical gear unit B2

Flender/Flender Gear Units/Bevel-helical gear unit B2

n sealed clay pots with fresh leaves and grass added.The fruits generated low 2and high CO 2atmosphere which retarded their ripening (4,. During the time of the Roman Empire, modied gas atmospheres were created by sealing underground pits lled with grain, and thereby protecting them from insects and rodents (. In the beginning of the 1th century, Berard ( demonstrated that fruitsplaced in closed containers did not ripen. Extensive research on the use of altered gasconditions to lengthen the postharvest life of produce started early in the 2th century,with the work of Kidd and West (, Thomas (, and Blackman (. Commercial storage under altered gas conditions started in England in 1, when apples were stored in 1 kPa CO 2and ambient 2(. Reduced 2concentrations and increased CO 2concentrations also proved to be benecial for products other than apples. CA storage was adopted in the 1s in Canada by . . Eaves and in the UnitedStates by . . Smock. After the Second World War, CA storage became increasinglyimportant in many pome fruit growing countries. While regular CA facilities focus onmaintaining 2concentrations between 3 and 4 kPa, the so-called ultra low oxygen (ULO) storage uses even lower concentrations. The advised 2concentrations for many apple cultivars are 1 to 2 kPa (. It is now common for some apples to be stored for over ayear in CA storage, .. Northern Spy apples in Nova Scotia (. Prange, unpublisheddata). 2.4.2 Packaging In contrast to CA, the gas composition within MA packaging is neither monitored nor adjusted. Depending on the 2sensitivity and metabolic activity of the product to be packaged, air or predetermined gas mixture is used to ush the packages before closing.The use of ambient air as the packaging gas is obviously most economical, but is an optiononly when the respiration activity of the produce under the prevailing storage conditions is high enough to reduce the in-pack 2level fast enough not to cause physiological or micr