METHOD OF CAASTORING UNRIPE FRUIT

摘要

In a vegetables and fruits-storing method of conventional controlled atmosphere storage including continuously feeding the air of a definite oxygen content such as, for example, 2 - 3% by volume and definite amount obtain by means of an adsorber into a refrigerator to obtain an atmosphere suitable for storage of the vegetables and fruits, an improved method wherein the improvement comprises in the first step feeding the open air and the atmosphere of the refrigerator to be recycled in such order or simultaneously into the adsorber packed with an adsorbent such as zeolite or the like which adsorbs more nitrogen than oxygen, adsorbing the nitrogen in the open air and the atmosphere and expelling the high oxygen content air of the adsorber having oxygen content lower than that of the open air but higher than that of desired atmosphere of the refrigerator, in the next step expelling a part of the remained high oxygen content air, and in the further next step, desorbing the nitrogen and the remained high oxygen content air of the adsorber to obtain the desired oxygen content air of, for example, 2 - 3% by volume and feeding the desired oxygen content air into the refrigerator, and repeating above steps; the recycling of the atmosphere in the refrigerator being carried out in order that the time for expelling said high oxygen content air of the adsorber is gradually shortened, while the time for feeding the desired oxygen content air into the refrigerator is gradually lengthened so that the amount of the desired oxygen content air obtained from a definite amount of said open air and said atmosphere can be gradually increased, to rapidly lower the oxygen content in the refrigerator to be the desired oxygen content.