| 摘要 |
<p>First end portion (16) of tube (12) which is filled with sorbant packing material (14), is fitted with a plug (20) having a passage (30, 36) therethrough. The plug (20) lies adjacent the material (14) and is movable within the tube (12). An end fitting (42) is also employed which has a portion located within the tube (12) adjacent the plug (20) and a passage (46, 50) therethrough which communicates with the passage (30, 36) of the plug (20). The end fitting (42) and the plug (20) are held together, e.g. by threaded engagement, and a seal (54) is used inside the tube (12) between these. The second end portion (18) of the tube (12) is also closed by means (90) which includes a passage (92) from the interior to the exterior of the tube (12).
<??>These arrangements at the ends of the tube (12) provide a good seal and allow pressure to be exerted on the packing material to obviate previous irregularities. Moreover all the fittings are re-usable. </p> |
