Water loss is loss of saleable weight and thus a direct loss to the grower or processor. A loss in weight of only 5% will cause many vegetables to appear wilted or shrivelled and in warm, dry conditions without the correct packaging this can happen in just a few hours. Even in the absence of visible wilting, water loss can cause a loss of crispness and undesirable changes in colour and palatability in some vegetables.
The relative humidity (RH) within a pack is influenced by the rate at which the product loses water-vapour and by the water vapour transmission rate (WVTR) of the packaging film. Convex Plastics can achieve significant increases in shelf-life by reducing the loss of the vegetables' stored energy reserves through lowering the respiration rate. This can be achieved by designing a pack giving optimum O2 and CO2 concentrations, as well as manipulating the WVTR of the film.
Broccoli Florets, Cauliflower Florets, Carrots, Baby Carrots, Peeled Garlic