| 摘要 |
<p>PURPOSE:To consistently protect the contents in a container from the outside environment during the use from the beginning to the last end by the external container so that the internal container is contracted along the centerline thereof in accordance with the used extent. CONSTITUTION:The external container 1 is made of polypropylene with high moisture-proofing and water-proofing properties. On the other hand, the inner container 2 is made of a functional membrane in which a highly gas-insulating ethylene-vinylalcohol copolymer is interposed and stuck in low density polyethylene having moisture-proofing, water-proofing and oil-proofing properties as well for lamination thereof. Adhesive layers are not provided between the external and internal containers to enable easy separation from each other with a weak external force. In this way, since the inner and outer layers are separated by rotating a fixed ring 3a joined to the extended inner layers of the opening flanges 6, 7, the ambient air equivalent to the consumed volume of the contents can compensate it from the air vent 8. Accordingly, the protective function of the contents is improved.</p> |
