套壳 meaning in English

housing
hub

R2 is the point of signal transfer between plunger and barrel
R2是顶针与套壳体之间的信号传输点。
It is with embosses the unit pairing chocolate by the cover or seal machine to carry on the packing , after its packing product contour artistic , the colored design is bright , stereoscopic effect
它是由套壳机与压花机组成对片状型巧克力进行包装，经其包装后的产品外形美观，彩色图案鲜艳，立体感强。