| 摘要 |
<p>A cap lining (10) for bi-directional venting comprises a disc-shaped, laminated, fluid-impermeable, gas-permeable material bottom layer (13), and having an extruded and cast polyethylene material top layer (15) having apertures (12) which communicate with the bottom layer (13) and communicate with channels (11) provided on the upper surface of the top layer (15) and the material of the laminated bottom layer is gas-permeable so lining allows bi-directional gas flow therethrough, for gases which have built-up inside the container to safety escape by venting from the interior of the container to the external ambient atmosphere through openings existing between the spiral screw threads of the cap closure and threads of the container neck, and the reverse venting to equilibrate for relatively increased external pressure, without passage of material from the interior of the container through the lining to the closure and to the exterior of the container.</p> |
