Toyo Seikan Kaisha, Ltd.

Kanemichi Yamaguchi

Kazuo Taira

Michio Watanabe

Masayasu Koyama

Toshifumi Tanahashi

Toshio Goryoda

Toshio Gryouda

Yoshitake Kawai

Shouichi Inaba

A package and a method are disclosed for preserving freshness of produce using a corrugated fiberboard composed of an outer liner having a carbon dioxide permeability coefficient Pco.sub.2 of greater than 5.times.10.sup.-10 cm.sup.3 (STP)cm/cm.sup.2 .multidot.s.multidot.cmHg at a temperature of 27.degree. C.; a corrugating medium; and an inner liner having a water-vapor transmission rate of less than 100 g/m.sup.2 .multidot.day at a temperature of 27.degree. C. The end parts of the corrugated fiber board which are exposed to an outer surface of the package are substantially sealed with a seal tape. A wrapping paper covered at least on one surface thereof with a resin layer which contains therein less than 0.917 g/cm.sup.3 density of a copolymer of ethylene and .alpha.-olefin having a carbon number of 3 to 12, having a carbon dioxide permeability coefficient of greater than 8.times.10.sup.-10 cm.sup.3 (STP)cm/cm.sup.2 .multidot.s.multidot.cmHg, a permeability coefficient ratio Pco.sub.2 /Po.sub.2 of greater than 3.5 and a water-vapor transmission coefficient of less than 80.times.10.sup.-9 cm.sup.3 (STP)cm/cm.sup.2 .multidot.s.multidot.cmHg is also disclosed. With the use of the package or wrapping paper, produce can fall in a dormant condition, and the freshness thereof can be preserved so that the storage period therefor can be prolonged.

Semi-sealed or sealed package for preserving produce composed of resin

Container having excellent preservability for content and

Method of making hermetically sealed container

In a method and apparatus for batch type sterilization of the type wherein sealed packages to be sterilized are charged into a sterilizing tank, steam is admitted into the tank, and then cooling water is admitted into the tank for cooling the sterilized packages, there is provided a heat storage tank which is heated by steam from an independent boiler for supplying steam to the sterilizing tank during the heating up step and subsequent sterilizing step which is effected at a constant temperature. During the cooling step, cooling water is admitted into the sterilizing tank from the top and bottom thereof and the cooling water in the lower portion is sprayed into the upper portion by means of a circulating pump.

Steam sterilization of materials in sealed packages

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Yokohama, Japan

Kanemichi Yamaguchi