B Use of high-density polyethylene films. A 0.03 mm thick low density polyethylene film is the most commonly used packaging film for fruits, vegetables and other items. This film's gas and vapor permeability is too low and can cause some vegetable spoilage.
On the other hand, high-density polyethylene film has not been used for packing vegetables, due to its low gas permeability.Low-density polyethylene film, with a thickness of less than 0.02 mm, is suitable for wrapping vegetables due to its high permeability for gas and vapor; however it is difficult to handle because of its poor strength. The low-density thin polyethylene film and high-density thick film are not suitable for packaging vegetables. This has led to the incorrect choice of package film.
Recent research has shown that a 0.01mm thick high density polyethylene film was effective in packing citrus fruits. Researchers have reexamined the thin high-density polyethylene high-density film. The 0.01 mm thick high density film has a gas permeability equal to that of 0.02 mm thick low density polyethylene film. This provides moderate CA storage and maintains the correct concentration of oxygen. The citrus fruit didn't rot due to the injury in an unsuitable gas environment. The 0.01 mm thick high-density polyethylene films has a slightly lower vapor permeability than the 0.02mm thick low density films. Therefore, vegetables that are easily damaged by a 0.03mm thick low density polyethylene film can be packed in the 0.01mm thick high-density film. This is due to extremely low humidity and low concentrations of oxygen.