The plastic compound film and the plastic aluminum foil compound film of double-chamber vacuum machine are applied by the vacuum packing machine as the packing material, which can be applied to instrument, medicine, the grain, pickled food, water products, and chemical material. It can effectively prevent the deterioration of articles caused by the oxidation of lipids and the reproduction of aerobic bacteria, thus achieving the functions of quality preservation, freshness preservation, flavor preservation and color preservation, while, for some soft articles, their volume can be reduced after 真空 包装，便于运输和储存。
1、吸尘
当真空室盖关闭时，真空泵工作，开始同步抽真空，真空表指针正转，达到额定真空度（由时间继电器ISJ控制）真空泵停止工作，真空停止。抽真空时，三通电磁阀IDT与热封室一起工作开始抽真空，热压机保持在原位。
2、热封
IDT破裂，外部空气通过其上部进气口进入腔室。真空室与热封气室之间的压力差有助于对热封气室的空气进行充气，从而使上热压架向下移动并压在袋口上。与此同时，热封变压器工作并开始密封。同时，时间继电器2SJ动作，几秒钟后，热封完成。
3、回气
空气进入真空室。真空表指针回到零位。热压支架重新安置。
4、骑自行车
将上真空室盖旋到另一真空室盖上，进入下一工序。左右室可交替工作。
