| 摘要 |
PROBLEM TO BE SOLVED: To provide a both-direction air permeable liner capable of passing air even under any sealed part to which torque is applied and capable of being also utilized as an air impermeable liner at the same time. SOLUTION: A cap liner 10 for both-direction air permeability contains a bottom part layer 13 composed of a fluid impermeable and air permeable substance and a top part layer 15 composed of a polyethylene substance extruded to be subjected to cast molding and the top part layer 15 has openings 12 communicating with the bottom part layer 13 and the channels 11 provided to the surface of the upper part of the top part layer 15 and a substance of the laminated bottom part layer 13 has air permeability and, therefore, the liner permits air to flow in both directions. The gas generated within a container is passed from the interior of the container to the atmosphere through the opening parts between the spiral screw thread of a cap sealing part and the screw thread of a container neck to certainly escape and a substance is not passed through the liner from the interior of the container to the outside of the sealing part and the container and air permeation in a reverse direction is performed to achieve equilibrium against proportionally rising external pressure. |
