The technology characters of plastic cover with inside concave is analyzed, and related mold design is completed, furthermore, a simplified as well as easy to operate, three-way pulling-core structure is introduced to apply in the injection mold.

Methods Take the plastic lid of bottle intact,and having no loose glucose liquid of 5% 250 ml 66 bottles,divided into two groups at random,named study group and control group.

Pro/E based design of the injection mould for the plastic top cover;