Shanghai Daoqin Plastics Co., Ltd.

polyethylene (PE) pipe/tube extrusion molding fault/failure troubleshooting fault/failure formed and countermeasures 螺纹状 strip/profile if pipe/tube inner local generate 螺纹状 strip/profile 纹, main/primary is due to local temperature degree high, 应适当 reduce. pipe/tube inner full generate 螺纹状 strip/profile 纹, main/primary is due to pressure shrink gas amount small, 应适当 add large gas amount surface cold pipe/tube outer surface 毛糙. generate cold material main/primary causes is mold temperature degree low and cooling solid fast, 应适当 improve/increase mold temperature degree and decrease/reduce cooling type ring water amount light block tube/pipe outer surface generate light transparent block (俗称“眼睛”), main/primary causes is mold temperature degree high or cooling 不足. 应适当 reduce temperature degree and increase cooling type ring water amount outer ring tube/pipe upper 隆起一圈圈凸 ring or 牵引不出, main/primary is due to machine design combined or cooling solid fast. 应考虑 heavy new design machine and decrease/reduce cooling type ring water amount surface if pipe/tube inner has 凹坑, main/primary is due to raw materials wet, 应进行 preheating drying 处理. pipe/tube outer has 凹痕, main/primary is raw materials inner mixed has 杂质, 应清洁 raw materials or use new material and bending (1)口模 and in 心位置不 positive. adjustment versus 互间 同心 degree. (2) machine 头周围 temperature degree non-uniform. 应检查 machine add hot device is loss bad, will temperature degree adjustment uniform. (3) cooling water 离口模太近. adjustment cooling type ring 位置. (4) cooling type ring water more. decrease/reduce water amount or 拉断(1) if process in, tube/pipe upper generate small 洞, main/primary is due to cooling type ring water less. 应适当 increase water amount. (2)若 tube/pipe upper large 洞, main/primary is due to pressure shrink gas gas amount large. combined adjustment pressure shrink gas to amount. (3)若牵引太 fast, pipe/tube easy 拉断. combined control speed degree