Food or edible material: processes – compositions – and products – Packaged or wrapped product – Three or more layered packaging materials
Patent
1998-07-14
2000-05-16
Bhat, Nina
Food or edible material: processes, compositions, and products
Packaged or wrapped product
Three or more layered packaging materials
426395, 426404, 426410, 426419, 383111, A23B 900, A23K 302
Patent
active
060634189
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for insecticidally storing grains and to a container for storing grains in which grains such as unpolished rice, polished rice, or the like can be stored for a long time with harmful insects being exterminated.
BACKGROUND ART
Various types of methods and devices have been proposed for storing grains such as unpolished rice or the like over a long period of time.
The method for packing rice for long-term storage disclosed in Japanese Patent Application Laid-Open No. 48-26516 proposes means for placing rice within a bag and substituting the air within the bag with carbon dioxide gas, sealing the bag with the carbon dioxide gas at a ratio of 0.8 to 0.9 apparent specific gravity within the bag, and drying the rice until there is a low moisture content with the moisture content of the rice and the moisture content of the carbon dioxide gas in equilibrium. However, in this storage means, the principal object is only the moisture content of the rice, and no consideration whatsoever is given to insecticidal action against grain weevils included in the rice. Therefore, the carbon dioxide gas passes through the bag and is dispersed, and in accordance with the decrease in the concentration of the carbon dioxide gas, grain weevils propagate.
Further, Japanese Patent Application Laid-Open No. 49-116246 discloses a method for storing grains or the like in an inert gas atmosphere. It is proposed that grains are filled up in a silo which has an inert gas atmosphere, and are stored for a long time by the pressure, temperature and humidity within the storage tank being adjusted automatically. However, in this invention, the silo, which is a strong structure, is needed. Further, because the silo must be built air-tight, it is impossible to transport. A completely sealed, large equipment is needed, and the manufacturing cost thereof is also expensive.
A method of exterminating harmful insects in stored unpolished rice is disclosed in Japanese Patent Application Laid-Open No. 1-279812. This invention discloses exterminating harmful insects in unpolished rice by creating an atmosphere having a vaporized carbon dioxide gas concentration of 50% or more. However, a large silo which is a strong structure is presupposed as the insecticidal device, and the concentration of the carbon dioxide gas filled therein is extremely great. Therefore, a means for reducing the amount of carbon dioxide gas used is also disclosed.
DISCLOSURE OF THE INVENTION
In view of the aforementioned facts, an object of the present invention is to provide a method for insecticidally storing grains and a container for storing grains which do not require large, strong structural equipment, which are convenient for transport, which use the minimum amount of carbon dioxide gas of a demand, which have effective insecticidal and anti-mold effects, and which are suited for long-term storage.
In a first aspect of the present invention, an inner bag of a flexible material is accommodated within a high-strength outer bag. After grains are filled in the inner bag, the inner bag is filled with carbon dioxide gas and closed, and the grains are stored in a state in which harmful insects are exterminated. In this case, the inner bag may be made to be able to maintain a carbon dioxide gas concentration of 40% or more for seven days or more, and the inner bag may be made of a heat-sealable plastic whose carbon dioxide gas permeation amount is less than or equal to 6300 cc/m.sup.2 .multidot.24 hr.multidot.1 atm.
A second aspect of the present invention has an inner bag, which is made of a flexible material and in which grains are filled and which thereafter is filled with carbon dioxide gas and closed, and an outer bag, which is high-strength and accommodates the inner bag. In this case, it suffices to have an inner bag for the filling-in of grains which is made of a flexible material and can maintain a concentration of 40% or more of the filled carbon dioxide gas for seven days or more, and to have an outer bag w
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Hayashi Naoki
Itagaki Naoshi
Kimura Hiroshi
Sugimoto Teizo
Takeda Toshiyuki
Bhat Nina
Fujimori Kogyo Co. Ltd.
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