综述了牌号切换的研究进展，阐述了牌号切换的目标和策略。
This paper reviewed the latest studies on grade switch-over and expatiated upon the goal and tactics of grade switch-over.
聚烯烃生产过程中的牌号切换问题对生产成本和生产策略有很大影响。
The grade switch-over in polyolefin production process often caused a great influence on production cost and production strategy.
特别是在产品牌号切换过程中会产生大量的不合格料，带来了经济上的损失。
Especially during grade transition, a lot of off-specification polypropylene are produced and leads to loss of profits.
仿真结果表明，通过实施优化控制，能够使产品牌号切换过程的过渡时间和过渡料数量降低60％以上。
Simulation results show that through implementation of optimal control, the transition time and off-spec product can be reduced over 60% in the polypropylene grade transition.
仿真结果表明，通过实施优化控制，能够使产品牌号切换过程的过渡时间和过渡料数量降低60％以上。
Simulation results show that through implementation of optimal control, the transition time and off-spec product can be reduced over 60% in the polypropylene grade transition.
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