bottom cap

基本解释

Mould name: P - 201 packing paper tube（paper tube body，top cap，bottom cap and the extrusion nozzle）.
1：模具名称：P-201包装用纸管（纸管本体，上盖，下盖，挤出嘴）。
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Aluminium is used for the bottom cap for increased durability, lower maintenance and ease of rebuilding.
铝是用于底部的上限，增加耐用性，降低维护和易用性的重建。
The paper introduces the shaping method improvement and technological trial course of bottom cap of certain model of carrier rocket's fuel tank.
介绍了某型号运载火箭二级燃料箱后底顶盖成形方法改进及工艺试验过程。

So my idea was to create a bottle with a cap on the bottom too.
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