| 摘要 |
<p>The device consists of a suction pump (1) connected by a tube (2) to one or more vents (3) which can be provided with filters (4). The filing neck (6) is provided with a stopper (5) and the sack (7) is attached to the neck, against the air holes (10) by straps (8) applied to the opening of the sack. The sacks are filled from a weighing hopper (12) the air being sucked from the material as it passes the vents. The sack is sealed hermetically by pasting, sewing or welding.</p> |
