* Computer simulates tensile test is adopted in preform mould manufacture.

* By using multilevel and double conicity location technology, each cavity lock the mould soly to ensure mould coaxiality error between 0.05 and 0.06 mm.

* Mould cavity steel and core steel are S136 (imported from Sweden) and 718 with hardness ＞HRC45.

* Screw is made according to international standard of nitriding steel with hardness ＞HRC60.

* Hot runner is from Japan. Free of cutting sprue to save labor. Advanced processing equipment adopted to make inchangeable cavities and cores.

* Fully automation production can be realized to compete with world level moulds.