| 摘要 |
The specification discloses vacuum packaging apparatus including welding bars, and clamping bars for holding the edges of the packaging envelope before, during, and after the welding operation. Preferably the clamping bars may have grooves therein to facilitate escape of air from within the envelope during the evacuation phase. A jet of air is blown across the welded edge to cool the weld and facilitate separation of the welded edges from the welding bars.
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