From the perspective of convex pipe stress in the cap from hemispherical tube cap.

从受力角度看凸形管帽中从半球形管帽。

youdao

How come when you close a glue cap the glue sticks but this same paste does not stick to the sides of the glue tube?

为什么把胶水盖盖到胶水管上的时候胶水不会把它们粘在一起？

youdao

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）。

youdao

Among the benefits promised under the new arrangement are a new tube line, a cap on fares, more late-night trains and air conditioning to prevent sweltering summertime conditions.

BBC: Tories propose tube sell-off

The wraparound labels on conventional round bottles were difficult to read, so she designed a flat tube-shaped container that stood upright on its cap, with plenty of room for a large, flat label that could be read easily at a glance.

WSJ: When Simplicity Is the Solution