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The packaging of this type of structure is widespread now. Due to this structure, there are some of waste problems. As core tube is incisal bevel shape, the final bath foam will be wasted because of air evacuation caused by the core tube.
Now, design the core tube into a gear-shape. In this way, the last bath foam is not wasteful due to the reason that the core tube causes air evacuation, reducing damage to the environment.
Jinbo Cai Jingbin Tang Weibiao Tan