| 摘要 |
<p>A sealing bar (1) for heat sealing a length of heatsealable material, such as tubing, to form packages and the like. The sealing bar (1) has a surface (19) adapted for pressure engagement with the heat-sealable material for flattening it and heating it. A slot (23) extends substantially through the bar (1) adjacent the surface (19) of the bar (1), thereby defining the portion of the bar (1) between the slot (23) and the surface (19) as a relatively thin resiliently flexible bridge (25). The bridge (25) is engageable with a portion of the flattened heat-sealable material, such as a portion of tubing (T) having a longitudinal seam or a gusset (L), thicker than other portions of the heat-sealable material and the bridge (25) is adapted resiliently to yield on engagement with the thicker portion of the material.</p> |
