1. Prevention of seizure: During the use of the mold, seizure may occur due to the expansion of the material or its thermal expansion and contraction. Taper design can make a certain oblique angle between mast column and matching sleeve, reduce the friction and sealing force between them, thus effectively avoiding jamming.

2. Improve the loading and unloading efficiency: Taper design can make the loading and unloading between the cylinder column and the matching sleeve easier and faster, and save the time and labor cost of mold disassembly.

3. Reduce deformation: Because the mast column is slender, it is easy to bend and deform. By increasing the taper design, the length of the column can be reduced to some extent, its stiffness and stability can be improved, and the possibility of deformation can be reduced.