五面压盒：五个面全部受压，完美去除气泡，生产的盒子方正美观、立挺饱满，表面无划痕、无气泡、无皱褶；

Pressing five surface: All the five surface is pressed and removing the bubble perfectly. The box produced is square, nice, straight and full. No scratch, no bubble and no folds on the surface.

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当然，故障原因也和把挺在主夹板上的磨损有关系，因此问题也可能出现在立轮和小钢轮之间。

Of course, the cause of the fault and the wear on the main splint has a relationship, so the problem may also appear in the vertical wheel and the small steel wheel.

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