Taiyo Fishery Co., Ltd.

Takahiko Kagawa

Yasuhiko Sasamoto

Tahiko Inukai

Kiyoshi Kajiwara

Michio Nonaka

Minoru Maruyama

There is disclosed a method for inspecting leakage of a sealed container which is effectively used for detecting a leaking place such as a pin hole, crack, etc. of a sealed container which contains foods, pharmaceuticals, chemical industrial products, etc. A method for inspecting leakage of a sealed container according to the present invention comprises changing an internal pressure of a vacuum chamber provided with an eddy-current displacement sensor to a predetermined degree of vacuum from a normal pressure after putting a sealed container to be inspected having a conductive material on at least at a portion of the container in the chamber; detecting an amount of expansion of the sealed container at the degree of vacuum in time sequence by the eddy-current displacement sensor; and determining any change in the amount of expansion after a time when the detected amount of expansion shows the maximum value, thereby to determine any pin hole formed in the sealed container.

Method for inspecting leakage of sealed container

Green salmon roe, whether it is very fresh or less than fresh, is salted under agitation in a saturated aqueous solution of salt containing a nitrite and being free from any precipitates, and is then dehydrated. The roe thus salted is immersed under agitation in a saturated aqueous solution of malate containing a nitrite and being free from any precipitates. The roe thus processed is worked up in the conventional manner.

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Tokyo, Japan

Takahiko Kagawa