模具设备：采用直角多层螺旋分流式结构，此结构减小了挤出压力，塑化均匀，高速挤出成型稳定，管材各项指标均达到国家标准。结构为新型烯烃类组合式，管材壁厚均匀，内外平滑，无凹凸或疤痕，定型更稳定，尺更准确.Die: the right angle multi-layer spiral split structure is adopted, which reduces the extrusion pressure, plasticizes evenly, and the high-speed extrusion molding is stable. All indexes of the pipe meet the national standards. The structure is a new type of olefin combination type, with uniform wa