| 摘要 |
A packaging method and package for preserving cherries using a low barrier plastic film to provide them with a long shelf life is described. The low barrier plastic film has a gas permeability of at least 80 cc O2 and 490 cc CO2 per mil per 100 square inches per day at 25 DEG C. and 760 mm HI. Both high density polyethylene and low density polyethylene films having a thickness in the range of 0.0006 to 0.003 inch are used in examples for packaging bags. However other low barrier film plastics can be used including polypropylene The bags are provided with one or more small perforations to adjust their gas permeability. After cooling the cherries to about 36 DEG F. they are deposited in the bags. The bags are partially evacuated to remove about one half the air and an injection gas of at least 30% CO2 and the balance N2 is injected to fill the bag which is then heat sealed. As a result, a residual protective gas of about 4-13% 02, 4-14% CO2 and balance N2 is maintained in the bag after seven days from sealing. The packages of cherries may be stored at about 28 DEG F. for two months or mere without significant decay or mold and without adversely affecting the appearance or taste of the cherries.
|
