In order to effectively condition and loosen tobacco bales and decrease steam consumption, a composite vacuum pre-conditioner was designed by incorporating rotary vacuum conditioning and loosening technologies. The pre-conditioner was mainly composed of a driving device for vacuum conditioning, a rotary sealing device, a conditioning device and a cylinder body with tobacco buildup prevention structure. Five testing batches of tobacco bales were processed by the designed pre-conditioner under different technical conditions, the results showed that: 1) The ordering efficiency of tobacco strips reached 100%, their loosening rate was up to 98% with a uniform moisture content. 2) The technical parameters of the new pre-conditioner were adjustable over a wide range, allowed it to process tobacco bales at different intensities; the temperature of the processed tobacco was 50 ℃ or 65 ℃. 3) No tobacco built up on the inside wall of cylinder basically, it was convenient in maintenance. 4) The steam consumption reduced by 35% comparing with a traditional vacuum pre-conditioner. Rotary vacuum conditioning system provides an alternative for the vacuum conditioning of tobacco.%为解决传统箱式真空回潮机存在的烟包松散效果不理想、回透率低、蒸汽损耗大等问题，采用旋转式动态真空回潮技术设计了复合式真空回潮机，主要包括动态真空回潮驱动装置、旋转密封装置、加潮装置、筒体防粘料结构等部件，实现了对烟包进行动态真空回潮的功能。在不同工艺条件下对复合式真空回潮机进行了5次过料试验，结果表明：①片烟回透率达100%，松散率达98%，含水率均匀。②设备工艺参数调整范围宽，可针对不同物料采用不同的加工强度，出料温度在50℃和65℃时，各项技术参数均能达到工艺要求。③过料后筒体内壁基本上无物料粘附，设备维护方便。④蒸汽耗量约为传统真空回潮机的65%，有效降低了能源消耗。因此，动态真空回潮系统为烟叶真空回潮工艺处理提供了一种新型工艺装备。
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