1·A kind of punching machine spring was developed by using polyester prepolymer, MOCA as raw materials.
以聚酯型预聚体和MOCA为原料研制了一种冲床弹簧。
2·Laser cutting technology can partly replace a punching machine or line cutting in the field of hardware, tubular product and lighting industry.
激光切割技术在五金和钣金、广告、工艺及灯饰行业，可大部分代替冲床和线切割。