Toyo Seikan Kaisha, Ltd.

Kyuichi Shibasaki

Hideo Kurashima

Kazuhisa Ishibashi

Muneki Yamada

Isao Tanikawa

Tsunehisa Namiki

Tamio Fujiwara

Ikuo Sugiyama

Sealed container for microwave oven cooking

An apparatus for detecting pinholes in cans comprising a dark box consisting of a light seal plate and a window, a photodetector detecting electrically the outer penetration of light, and light sources disposed around the can. The light seal plate has a groove for receiving an open end of a can therein and is of a hardness greater than that of the can. The groove of the light seal plate communicates with a trap. The surface of the groove is black non-luster.

Apparatus for detecting pinholes in cans

An internal pressure inspecting method and system for determining the degree of unevenness of the surface of an elastic cover of each of one or more hermetically sealed containers, the unevenness being produced according to the internal pressure. The distance from a fixed position exterior of the hermetically sealed container to said cover surface is determined by measuring the change in inductance utilizing the action of electromagnetic induction, at a plurality of points i.e. the center and peripheral portions thereof. A value is derived by calculation of the difference between a mean value of both measured values at any one point in the peripheral portion and at the position on the diametric line which is in symmetrical relation therewith with the center of the container cover as the center of symmetry, and the measured value at the center of the container cover. The internal pressure of said hermetically sealed container is determined from this value.

Internal pressure determining method and system for hermetically sealed

A method and apparatus for inspecting the internal pressure of hermetically sealed containers wherein a sound wave of free damped oscillation exicted at the elastic wall of a hermetically sealed container is converted and detected as an electrical signal, analysis is performed for natural self-correlation function of this detected signal by using logical operation circuits, and thus, the adequacy of the internal pressure is discriminated by measuring the period of such function.

Method and apparatus for inspecting an internal pressure of hermetically

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Yokosuka, Japan

Kyuichi Shibasaki