BACK SUCTION MECHANISM USING CUP RUBBER, DOUBLE CONTAINER COMPRISING THIS BACK SUCTION MECHANISM, AND SQUEEZE OPERATION MODE PUMP TYPE PRODUCT COMPRISING THIS DOUBLE CONTAINER

摘要

PROBLEM TO BE SOLVED: To attain the integrity of back suction action during content discharge movement using cup rubber and the prevention of oxidation of a container storage content by application for example to a delamination bottle.SOLUTION: A cup rubber 5, attached to the content discharge side of a known delamination bottle 1 which shows the action of preventing content oxidation, comprises a valve action cylindrical part (top face part 5e of a cross slit 5f+inner annular standing part 5d), a base part (5a+5b) attached to an inside plug 4, and an annular telescopic joint 5c between them. In accordance with content discharge operation to an outer container 3, the inside of the annular telescopic joint 5c displaces upward while resisting self elastic force to shift the whole of the valve action cylindrical part toward a content discharge opening 6e. The release of the content discharge operation causes the whole of the valve action cylindrical part reset to an initial position to be reset by the elastic force of the annular telescopic joint 5c. A volume change of a back suction space area S2 is increased between the time of content discharge operation and the time of release of the same by upward and downward positional changes of this whole of the valve action cylindrical part.SELECTED DRAWING: Figure 2