H2-KV-21-A flender company Helical speed reduction gearboxes H2

Flender/Flender Gear Units/Helical speed reduction gearboxes H2

at 8 (. Lower relative humidity causes too much mass loss, whereas higher relative humidity causes decay. MHP can effectively be used to minimize loss ofquality in products for which water loss is the most predominant cause of quality changes,such as bell pepper and tomato. In such cases, the concentrations of 2and CO 2in MHP are often close to that of ambient air. 3.3.3 Surface Coatings Surface coatings have been applied to many fruits and vegetables to reduce transpiration losses, as well as to restore or enhance gloss and improve storage quality. For example,fruit surface coatings reduce the mass loss of papaya during storage (; maintain betterrmness, titratable acidity, and greener skin color in pears (; decrease mass loss andthe incidence of discolored stems and surface pitting in cherries during storage (; retainesh rmness and acidity in apples (; and control mass loss and preserve gloss of citrus fruit (. Good coating formulations should have the following characteristics (: nontoxic to humans, good permeability properties, stability in formulation, rapid drying, strongadherence to the fruit throughout the entire storage life, high gloss, and economical. How- 4 DeEll et al. ever, it is possible that specic coating may be acceptable for some produce but not for others, due to the properties of both the coating and the product. All surface coatings offer some resistance to gas exchange, depending on their thick- ness and composition. Commercial carnauba waxes are more permeable to 2, 2, and ethylene than waxes made from shellac and rosin (. Hydrophilic coatings, such as those incorporating starch, carrageenan, or cellulose, retard the movement of these gases, but have less effect on water vapor (. Since surface coatings can alter the 2and CO 2 levels within product, they can also interfere with postharvest ripening, as observed inguavas coated with cellulose- or carnauba-based emulsions (. 4 ETHYLENE There are several recent publicat