| 摘要 |
<p>A thermal insulation bag (1) for vacuum-pckaging micropowder material (12) comprises a multi-layer sheet having thermoweldable plastics layers (8, 10) and an intermediate metal layer (9). To prevent heat conduction through the metal layer from one side of the bag to the other side, the metal layer is of smaller dimensions than the other layers so that the sealed edges (3) do not comprise the metal layer edges. For positioning and fixing purposes the metal layer (9) only comprises small tabs 9A which are sealed between the plastics layers (8, 10).</p> |
